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Use of hard alloy wire drawing die
After installation and debugging, the drawing mould can produce the qualified workpiece, which is called the service of the mould. In general, we always hope that the molds will have long service life to meet the actual needs of production. But the mold may produce some defects in the manufacturing process, or gradually appeared in the process of serving some defects, such as micro cracks, mild wear, deformation, etc., under the condition of the mold are hidden but still can continue to work, this is a flawed but not lost the ability of serving state is called the mould damage. The drawing die is damaged for some reason, or the mould damage is accumulated to a certain extent causing the mould to be damaged, unable to continue to serve, which is called the failure of the mould. In the production, the main working parts of the mould are damaged, can not continue to punch out the qualified workpiece, that is to think the die is invalid. The failure forms of stamping die are generally plastic deformation, wear, fracture or cracking, metal fatigue and corrosion. The failure of wire drawing die is generally divided into two types: normal failure and early failure. Wire drawing die after a large number of production use, because of the friction and wear and tear or produce plastic deformation and fatigue crack, slowly to normal life after failure belongs to the normal phenomenon, for normal failure. The die fails to meet the time limit of design and use, which can produce the early destruction of broken blade, fracture and fracture. Or can not continue to serve due to severe local wear and plastic deformation, for early failure. For early failure of molds, it is necessary to find out the cause of its production and try to take remedial measures.
Natural diamond die, choose high quality natural diamond as materials, has a high resistance to wear, high brightness, long life and other advantages, is an indispensable tool for wire and cable and all kinds of wire drawing factory; Synthetic diamond wire drawing die, choose high strength artificial polycrystalline diamond core material, with high hardness, good thermal conductivity, high resistance to wear, not easy broken, long service life, high economic benefit, etc. Suitable for control of various kinds of metal wire. Compared with foreign products, the domestic drawing die billet has the following obvious disadvantages: The entrance is small. Because in the process of drawing wire first contact and mold core entrance area, entrance area cone Angle is small, not only increase the surface contact between the wire and inner hole, make the friction increases, and obstruction of lubricant into, make the lubrication effect of variation in the process of drawing, seriously affect the service life of the mold. In addition, the inlet Angle of foreign wire drawing die is increased, which effectively avoids the abrasion of wire and wire drawing die, and brings in more lubricant, which enhances lubrication effect and reduces wear of die core. This change improves the surface quality of the wire and the service life of the wire drawing die. The workspace is short. Compared with the domestic same type of drawing die, the length of foreign wire drawing work area is much longer. The longer working area is advantageous to reduce the friction force and uniform distribution in the drawing process, reduce the wear of the inner hole and improve the die life. The long and narrow working area can reduce the gap between the wire and drawing die, which can force more lubricants into the middle of the wire and inner hole under the great pressure, resulting in better lubrication pressure. The temperature of the wire from the inner hole is lower, the drawing force is reduced, the flow of metal in the drawing process is more uniform, which is conducive to the improvement of drawing speed and the improvement of the surface quality of the wire. In addition, this type of workspace design also prevents the lubricant from exiting the inlet end of the drawing die. However, due to the short working area of the mould in our country, the effective use area of the hole is small, which not only increases the friction, aggravates the wear, but also wastes the raw materials and increases the cost input. The diameter area is not obvious. The final-diameter area is the final part of the final dimension of the wire, and the short and unflatness of the definite diameter will directly affect the final quality of the wire. The short diameter of the belt can easily cause the product size to be too poor, and the drawing die quickly wear out. Clear and straight path can produce high precision and high surface quality wire, and can reduce wear, greatly improve the service life of drawing die. It can be seen from the comparison of the wear curve of the German production drawing die and the drawing die of hunan steel, that the two kinds of drawing die are working in the same drawing condition: workpiece material: no. 65 steel wire; Drawing speed: 3.64 m/s; Drawing lubricant: soap powder; Presurface coating: acid pickling, phosphating, borax. The results show that the structure of drawing die has a great influence on the use of wire drawing die. The life of German wire drawing die is 2.72 times higher than the life span of the production wire drawing die. The above comparative analysis proves that the perforation optimization can reduce the wear rate of drawing die and prolong the service life of drawing die. Therefore, drawing die of groove optimization, improve the manufacturing precision of the drawing die, can save the production cost, increase production efficiency, it is of great significance to the development of wire industry in China.
1. The steel mould can be used when pulling soft metal (such as gold and silver), and the steel mould can have many holes of different pore diameter. 2, hard alloy die - drawn wire (steel wire) generally USES hard alloy moulds (Tungsten carbide nib), the typical structure of the mould for a cylindrical (or with a slight taper) of cemented carbide mold core closely embedded in a circular steel bushing (case), the mold core in the inner hole Bell mouth radius, (Bell), the inlet cone (Entrance angel), deformation (work) cone (approach Angle) and sizing of all (bearing) and outlet Angle (back relief). 3. Wire die - drawing metal wires, such as copper and aluminum, are also more used with wire drawing die, with some differences in the shape of inner hole. 4. Polycrystalline molds - pull fine lines can be used in polycrystalline models (artificial diamonds), as well as drawing dies for natural diamonds.
Drawing die widely used, such as electronics, radar, and TV, instruments and high precision wire and used in the aerospace and other commonly used tungsten, molybdenum wire, stainless steel wire, wire and cable wire and all kinds of alloy SiDou with diamond die is drawn out, diamond die due to adopting natural diamond as the raw material, which has extremely strong wear resistance, high service life.
China is a leading producer of wire materials and ranks among the world's largest producers. China's rapid development of wire drawing die manufacturing industry since the eighty s, with the continuous improvement of wire drawing die manufacturing level and the continuous improvement of production technology, the wire drawing die manufacturing technology in China has further development, especially in such aspects as material, structure of drawing die has made remarkable progress. But overall, there is a big gap. Although the type of wire drawing die production abroad to domestic similar, but more advanced materials and process, the machining precision of wire drawing die, durability, abrasion resistance and other indicators are better than Chinese products. Therefore, it is an important task to strengthen the mould management, improve the quality level of drawing mould and promote the development of molding technology.
After several decades of development, a lot of new wire drawing materials have emerged. According to the material type, can be divided into alloy steel die, hard alloy die, natural diamond die, polycrystalline diamond mould, CVD diamond die and ceramic mould. The development of new materials has greatly enriched the application of drawing die and improved the life of drawing die. Alloy steel (1) alloy steel mould is an early drawing die making material. The materials used to make alloy steel mould are mainly carbon tool steel and alloy tool steel. But as a result of the alloy steel hardness and poor wear resistance and short service life, can not adapt to the need of modern production, so the alloy die soon be eliminated, is almost invisible alloy steel in the production and processing. Carbide die (2) hard alloy mould is made of hard alloy. Cemented carbide is a tungsten cobalt alloy whose main component is tungsten carbide and cobalt. Tungsten carbide is the "skeleton" of the alloy. Cobalt is a bonded metal which is a source of alloy toughness. Therefore, cemented carbide die compared with alloy steel mould has the following characteristics: high wear resistance, good polishing, small adhesion, low friction coefficient, low energy consumption, high corrosion resistance, these features make a wide variety of cemented carbide drawing die processing adaptability, become today's most used wire drawing die. The main brand YG8 cemented carbide drawing die, YG6, YG3, followed by the YG15, YG6X, YG3X, developed some new brands, such as new brand YL for high-speed wire drawing, and drawing die brand CS05 imported from abroad (YLO. 5), c20 (YL20), CG40 (YL30); ZK10, ZK20 / ZK30. Natural diamond die (3) natural diamond is the allotrope of carbon, which is characterized by high hardness and good wear resistance. However, the brittleness of natural diamond is larger and harder to process, which is generally used to make the drawing die below 1.2mm in diameter. In addition, natural diamond is expensive, the supply is in short supply, so the natural diamond model is not the economic and practical drawing tool people are looking for. Polycrystalline diamond die (4) polycrystalline diamond is an artificial diamond single crystal with high quality and good quality, with a small amount of silicon, titanium, etc., which is polymerized under high temperature and high pressure. Polycrystalline diamond hardness is very high, and has a good wear resistance, compared with other materials, it has its own unique advantages: due to the anisotropy of natural diamond, in the process of drawing, when the whole hole all around in the working status, natural diamond in hole wear a position will be preferred; And the polycrystalline diamond is polycrystalline and has isotropic characteristics, thus avoiding the phenomenon of uneven wear and uneven pattern of die holes. Compared with hard alloy, the tensile strength of polycrystalline diamond is only 70% of common cemented carbide, but 250% is harder than hard alloy, in this way, makes the polycrystalline diamond die than cemented carbide die has more advantages. It is made of polycrystalline diamond with good abrasion resistance, uniform internal hole abrasion, strong resistance to impact, high drawing efficiency, and much cheaper than natural diamond. Therefore, polycrystalline diamond model is widely used in the drawing industry. CVD coating die (5) CVD (chemical vapor deposition) coating is a newly developed new technology, and its main method is coating diamond film on hard alloy wire drawing die. Diamond polycrystal diamond film is pure, it has the bright and clean degree of single crystal diamond, temperature resistance, wear resistance of polycrystalline diamond and price is low wait for an advantage, in preparation of instead of the rare natural diamond wire drawing die tool has very good effect, the wide use of it will bring new vitality for wire drawing die industry. Ceramic die (6) high performance ceramic materials with high hardness, good wear resistance, chemical stability strong, excellent high temperature mechanical properties and bonding with metal and other characteristics, can be widely used in refractory material processing. Nearly 30 years, due to the ceramic material in the manufacturing process to realize the purity of raw materials and the effective control of grain size, developed a variety of carbide, nitride, boride, oxide, whisker or add a small amount of metal technology. The strength, toughness and impact resistance of ceramic materials have been improved greatly. As a result of study abroad, ceramic materials have been widely used in the mould field, and have been patented in Japan, USA, France and other countries. Although ceramic wire drawing die has not been widely used in China, but with the continuous improvement of manufacturing technology, ceramics will be a good drawing material for drawing industry. Ceramic wire drawing die during wire drawing is not easy to adhesion with the metal wire, to improve the wire material surface properties, especially at high temperature control colored hard material (such as W, Mo wire, etc.). It can avoid the defects of hard alloy wire drawing die by using ceramic drawing die drawing, and can extend the die life and improve the surface quality of the material. The influence of die core of different material on drawing die life The mould core material used in wire drawing die mainly includes hard alloy, natural diamond, synthetic diamond and so on. In selecting the drawing die, the material properties of the wire and the quality of the wire shall be selected according to different processing procedures. Reasonable selection of core material is the main way to prolong its service life. The influence of die core of different materials on wire drawing die is introduced
1. Hard alloy The hard alloy of cobalt content of drawing die with low carbide, cobalt alloys, it has good abrasion resistance, impact resistance, optical and corrosion resistance, easy to repair, the price is low, is a common wire drawing die core materials, widely used in the coarse, wire drawing. The study shows that by improving the composition and structure of hard alloy, controlling the fluctuation value of carbon content and refining the particles of carbide can improve the performance of the material and prolong its service life. At home and abroad, the heat and isostatic pressure (HIP) treatment, ultra-fine crystal process and the addition of rare earth elements are used to reduce the porosity, refine grain, improve the hardness of the alloy, and reduce the friction coefficient. Using chemical vapor deposition (CVD) method and physical gas phase deposition (PVD) method, the surface strength of the alloy is improved by forming diamond film or titanium nitride coating on the surface of hard alloy. 2. Natural diamond Natural diamond commonly known as diamond, is one of nature's most hard material, has the very high abrasion resistance and thermal conductivity, used for tungsten molybdenum wire can improve the surface quality of wire drawing, improve the silk material performance and dimensional accuracy, it is mainly used for tensile filaments and the finished silk. But its property is very brittle, the impact performance is poor, and the hardness is different to the isotropy, and it is easy to wear out when making wire drawing die. In addition, the diamond is rare, the price is expensive, processing difficulty, therefore in the stretch, the coarse silk aspect is restricted. 3. Artificial diamond Synthetic diamond is also called the polycrystalline diamond, it is composed of many single crystal particles astatic polymerization of polycrystal, has high strength and hardness, impact resistance is stronger, uniform properties, good comprehensive performance. In stretching and filaments, the service life is higher than diamond die and hard alloy die, and the silk material is stable and the surface quality is good. However, the crystal grains of artificial polycrystalline diamond are thicker and more difficult to polish, and the surface finish of the tensile filaments is inferior to that of natural diamond. By refining grain, it can improve the polishing performance and replace natural diamond in the wire drawing die of medium and thin silk, greatly reducing cost and improving product quality.
The material of all kinds of drawing dies has its own characteristics. Among them, the price of natural diamond die is most expensive, processing is extremely difficult, at the same time because of the anisotropy of natural diamond, within the scope of the radial stiffness difference is very big, easy to cause severe wear on a certain direction, so the natural diamond die is only applicable to processing small diameter wire. The hardness of hard alloy die is low, the wire material with hard alloy die drawing is high, the surface roughness is low, but the wearability of hard alloy die is poor, the service life of die is short. The hardness of polycrystalline diamond die after natural diamond, because it has the characteristics of isotropic, won't produce single radial wear phenomenon, but the price is very expensive, processing difficulties, the manufacturing cost is very high. CVD coated wire drawing die because of having the performance of the diamond and has good abrasion resistance, drawing wire with low surface roughness, but CVD coating wire drawing die manufacturing complex, processing difficulties and high cost; When the coating is worn down, the mold will wear out quickly, not only to ensure the quality of processing, but also can not be reused, can only be scrapped. Ceramic materials have a higher hardness and wear resistance than hard alloy, and the production cost is low, which is an excellent material for making wire drawing die between diamond and cemented carbide. However, due to the poor toughness, poor thermal shock and processing difficulties of ceramic materials, it has not been widely used. The advantages and disadvantages of all kinds of drawing materials are shown in table 2. Table 2 the advantages and disadvantages of several kinds of drawing materials Drawing material - advantages - disadvantages - application range Alloy steel mould - making simple - wear resistance, short life - basic elimination Natural diamond - high hardness, good wear-resisting properties - brittle, difficult to process - 1.2mm in diameter Hard alloy - good polishing, low energy consumption - wear resistance, machining difficulty - all kinds of diameter wire Polycrystalline synthetic diamond - high hardness, good wear resistance - processing difficulty, high cost - small wire, wire CVD coating material - high gloss, high temperature resistance - process complexity, hard processing - small wire, wire Ceramic materials - wear-resisting, high temperature resistance, good corrosion resistance - thermal shock, poor toughness and processing - no wide application Natural diamond, polycrystalline diamond and CVD coating die are commonly used in the drawing process of small wire and wire. When drawing a small diameter wire, CVD diamond coating die overcome the anisotropy of natural diamond die, at the same time has good strength and hardness, drawing the highest yield, surface quality and meet the requirements. The experiment shows that the life of the diamond drawing die of CVD coating is the same as the natural diamond mould, with high quality and better surface quality than the homemade polycrystalline diamond. Therefore, the diamond drawing die of CVD coating is an ideal choice for small diameter wire drawing. Despite drawing die can be used for processing all kinds of steel, copper, tungsten, molybdenum and other metal and alloy material, but different material wire drawing die have their applicable processing range, different materials of the same wire drawing die processing when the wear patterns and there was a big difference in service life, therefore reasonable drawing die material is selected to ensure that the key to successful application. The drawing die of different materials has its relatively reasonable processing object. The rationality of pull-out processing mainly refers to the mechanical, physical and chemical properties of the drawing die and wire, to obtain the longest die life. For example, in the same diameter copper wire drawing, polycrystalline diamond die service life is cemented carbide die life of 300 ~ 500 times, drawing nickel wire is 80 ~ 100 times, only when drawing the molybdenum wire, the life of only 50 ~ 80 times of the carbide die life, and the drawing of the carbon steel, the service life of polycrystalline diamond die only 20 ~ 60 times of cemented carbide die. Because of the lack of systematic research on the matching theory of drawing and wire in China, the blind choice leads to the waste of resources. Friction wear of wire drawing die is very complicated. It is divided into two categories: damage and friction wear. The destruction of the wire drawing die and can be divided into annular damage, tensile failure and shear failure and bearing surface damage, such as friction and wear can be divided into the abrasion wear and friction wear, corrosion and wear, abrasion, and fine particles produced by the wear, etc. Working conditions (wire materials, wire drawing materials, lubricants and so on) are different, so the wear and tear of the wire drawing die has its own unique process. The relationship between wear and tear of wire drawing dies is intrinsically related. The inside of the wire can be very subtle, and some factors may play a role at the same time, and their superposition is very complex and difficult to understand. May be a factor will hide the role of other factors, the effect of the above several kinds of damage and may often intertwined in the form of friction and wear, wear mechanism for the analysis of the destruction of the wire drawing die increased the difficulty. But on the whole, all kinds of wire drawing die wear order from high to low is: diamond die (not considering natural diamond anisotropic problem) - ceramic wire drawing die - hard alloy die - alloy steel has been eliminated. Through the study of the material of wire drawing die, drawing die is towards high strength, high hardness, high wear resistance, conforms to the requirements of the new material emerge in endlessly, wire drawing die greatly improve wear resistance, wear and damage significantly longer delay, wire drawing die life continues to increase, the machining accuracy has improved. The application range of pull-out processing is gradually expanding, from coarse to fine lines of various specifications can be processed, and there are different types of different types used to process irregular wires.
With the deepening of reform and opening up, domestic production of wire drawing die and corresponding die - hole testing instruments have been introduced. Through the analysis of the foreign drawing die, we can learn the design thought of modern drawing die and provide a reference for improving the design level of Chinese drawing die. The structure of wire drawing die core can be divided into five ranges: "entrance area, lubrication area, working area, fixed diameter area and outlet area". The inner diameter profile of the drawing die is very important. It determines the tension required for the compression of the wire and affects the residual stresses in the wire. The function of the core is: entrance area, easy to thread and prevent the wire from the entrance direction of the drawing die; Lubricate the area, which makes the wire easy to bring lubricant; The working area is the main part of the die hole. The deformation process of the steel wire is carried out here, and the original section is reduced to the required section size. The volume of the metal in the working area is a circular table in the metal of the cone, which is called the deformation zone. The conical half Angle alpha (also known as the cavity half Angle) in the working area is mainly used to determine the size of the drawing force. The function of the definite diameter is to obtain the exact size of the drawn wire. The outlet area is used to prevent steel wire outlet from uneven and scratch wire surface. With the increase of wire drawing speed, the service life of drawing die becomes a prominent problem. American T Maxwall and E G Kennth put forward the new drawing mode theory, namely "linear" theory, which ADAPTS to high-speed wire drawing. According to the theory, the drawing die has the following characteristics: The entrance area and lubrication area are merged into one, which has the tendency to reduce the lubrication Angle, so that the lubricant can be put under pressure before entering the work area, thus providing a better lubrication effect. The entrance area and the working area are lengthened to establish better lubrication pressure, and the Angle of the inlet is selected according to the drawing material and the compression rate respectively. The diameter must be straight and the length is reasonable. All sections of the longitudinal plane must be straight. The domestic drawing industry has conducted extensive discussions on the "linear" and "arc" drawing modes, and the most controversial ones are the shape of the working area and the shape of the boundary between the working area and the sizing area. Many people are positive about "linear" mode. But the author thinks that the two types of drawing die each have their own characteristics and the situation where they apply, and conclude without analysis, that the end is not biased. "Arc" on the mold core workspace, will make the flow of metal in the deformation zone is more twists and turns, lead to the increase of additional shear deformation and excessive deformation work, and make the drawing stress increases (usually a "linear" modulus increased 10-30%). The slope of the contour line of the "linear" mode work area is the same, so that when we determine the best working area of the cone half Angle alpha, we can pull the metal in the smallest stress state. However, because of the different curvature of each point on the contour line, the "arc" model can not make the whole workspace have such a best working area. From is advantageous to the metal flow and reduce the drawing stress of abroad in the compression ratio is 10 ~ 35% (most of the deformation of the wire are in this range) and drawing, rough specifications of the wire, generally adopt the "linear" workspace. And use "arcs" workspace, the deformation of metal, holes can be decreased gradually with the increase of the degree of strain hardening, the inner hole wall pressure distribution and wear are homogeneous, so "arc" workspace wearability. In particular, the lower compression rate is less than the hour (less than 10%), and the "arc type" working area can be used to obtain long deformation zone in the small corner of the area. Combined with the "arc" workspace has the characteristics of strong ability to adapt, so in a way times larger compression ratio (> 35%) or small (less than 10%) and the drawing wire, should adopt the "arc" mode.
Powder compacting hard alloy mould
1, Powder compacting hard alloy mould profile The powder compacting hard alloy dies is also known as metal powder pressing mould, powder metallurgy mould and hard alloy mould High hardness (minimum) 85.0 HRA , up to 92.0 HRA High strength, good wear resistance, good toughness, shock resistance and electricity The application of high quality, whole system and inner cavity is wide and non-stick. It is made of hard alloy material The precision grinding mould can greatly improve the surface quality of the product, and its service life is normal steel die 5-10 Times. Applicable to magnetic powder, ceramic powder, refractory metal powder, iron copper base powder, copper, iron, aluminum, zinc, no The most ideal cemented carbide molds moulded by metal powders such as rust steel. Widely used in electronics, Cars, Motorcycle, Machinery, household appliances, aviation, aerospace, shipbuilding and other fields. Production process Ingredients (according to applicable requirements of tungsten carbide powder 2, The cobalt powder is mixed to the powder The mixture of the mixture, the pressure and the pressure of the imported vacuum furnace. Sintering, sintering, blank, inspection (non-destructive ultrasonic testing) The design of the drawing, die set and die set or welding, electricity Processing (electric spark perforation or wire cutting) processing molding, grinding polishing processing, grinding, assembling, test mode and packaging.
3, Powder compacting hard alloy mould Technical parameters 1 , The WC And other alloy composition content % : 88.0 . 2 , Co content % : 12.0 . 3 And density G/cm 3 : 13.4 ~ 14.8 . 4 And hardness HRA : 85.0 ~ 91.5 . 5 , grain size, um : 1.0 ~ 1.8 .
6, Bending strength MPa : 2800 ~ 4000 . seven Modulus of elasticity GPa : 390 ~ 525 . 8 Coefficient of heat expansion 10 - 6 / 0 C : Impact toughness J/cm 2 : 4.9 ~ 6.8 . 4. Sanxin powder compacting hard alloy mold product features The design is reasonable, the precision of the machining precision is higher than the second level, and the finish can achieve the mirror effect, and the surface of the product is bright. 100% swap General; The powder compacting hard alloy mould is suitable for ordinary press and high speed press. The scope of application is wide, High hardness and high hardness Long life features. 5. Scope of application It is suitable for hard materials such as magnetic powder, ceramic powder, refractory metal powder, iron copper base powder, etc Alloy dies. Powder metallurgy pressing molding process has been widely used in manufacturing metal structure parts (such as gears), Sliding bearing, Friction zero piece (such as clutch or brake strap) , Electrical parts (such as refractory metal tungsten, Molybdenum and other electric appliances such as silver, etc. , Magnetic parts, tools (such as various cemented carbide tools) and heat resistant parts, aviation and nuclear materials. 6. The powder compacting hard alloy mould USES the cautions The crushing process of hard alloy die is mainly influenced by "the influence of powder performance" and "the influence of the suppression process" The major factors are as follows: 1 The effect of powder performance High hardness, small plastic, large frictional powder, can be improved by adding lubricant or molding agent. powder Low purity, When oxygen is high, The suppression performance is poor, and the reduction treatment of raw material powder can be overcome. A single fine particle or Coarse particle powder, The powder suppression performance of the shape regulation is not ideal, Mixed particle size and granular shape are used The powder can improve the suppression performance. 2 The impact of the suppression process The more polished, the higher the hardness and the more rigidity, the better for the bad body density. Adopt double The density of the blank body is higher than the one direction and more uniform. The lower the pressure, The longer the holding time, help High body density is especially important for large or complex grinding tools. 3 With high hardness and brittleness, the mould should be avoided during installation and use
The edge edge of the hard alloy die is very sharp, and should be carefully installed and used, avoid the edge of the scraping mould Safety accidents. 7. Configuration advantages 1 Design major: sanxin hard alloy mold designers not only have a deep understanding of the properties of hard alloy, but also for various types of mould The application and hardware machinery processing is also very professional, Know the working process of all kinds of hard alloy mould, So, Sanxin hard alloy mould design is also more professional, economical and efficient. 2 Special materials: the hard alloy manufacturer of sanxin hard alloy has a deep understanding of the hard alloy plate number and material selection Nature is more professional, the three xin hard alloy dies without the phenomenon of die, no disintegration phenomenon, the service life is longer. 3 Professional hard alloy manufacturer of sanxin hard alloy has the performance of hard alloy for mould The unit has a deeper understanding, Moreover, sanxin has advanced hard alloy hard alloy processing equipment. Nature sanxin hard together Gold mould processing is more professional. 4 , Fast advantage of production cycle: Professional design + Professional selection + Professional processing + Optimizing modern enterprise production management, Sanxin hard The production of quality alloy mould is natural and fast, and the quality and delivery time of the mould are always put in the first place. 8. Immediately purchase powder to suppress hard alloy mould to make an inquiry If you need to purchase powder to press hard alloy mould, please call immediately 4000013139 Our customer service business The staff will provide you with satisfactory service and quality hard alloy products. Ninth, sanxin service commitment 1 Guarantee sanxin simple hard alloy mould seven The shipment in the day, ordinary hard alloy stamping die 15 Days after the The fast delivery principle of shipment! 2 , Sold by Powder compacting hard alloy mould and Carbide die After all 100% I can test the test of the test The department has identified any quality problems caused by the quality of our products or the delivery of logistics. They will be unconditional and unconditional The quality problem carbide The mold.
How to choose carbide milling cutter
Carbide milling cutter is a milling cutter made of hard alloy. Know hard alloy cutter first have to know what is cemented carbide, tungsten carbide with high hardness of the refractory metal carbides (WC, TiC) micron grade powder as main ingredients, with cobalt (Co) and nickel (Ni), molybdenum (Mo) as the binder, sintering in vacuum furnace or hydrogen reduction furnace of powder metallurgy products
Hard alloy cutter main points: solid carbide cutter. Carbide straight shank slotting cutter. Carbide saw blade milling cutter. Carbide end milling spiral drill. Carbide end milling machine reamer. Carbide end mill. Carbide ball milling cutter head
Application of carbide milling cutter: The carbide milling cutter is mainly used in CNC machining center and CNC engraving machine. It can also be loaded into ordinary milling machine to process some hard and uncomplicated heat treatment materials.
- 1. Carbide cylindrical milling cutter: used for horizontal milling machine. The knife teeth are distributed on the circumference of the milling cutter, and the teeth are divided into straight teeth and helical teeth. The teeth are divided into two types: teeth and teeth. The teeth of the helical teeth are small, the tooth strength is high, the space is large, and it is suitable for rough machining. The fine-tooth milling cutter is suitable for finishing.
- 2. Carbide face milling cutter: it is used for vertical milling machine, end face milling machine or gantry milling machine, which has blade teeth on the end face and circumference, and also has the points of coarse teeth and fine teeth. The structure has the whole body type, the tooth type and the indexable type 3 kinds.
- 3. Carbide end milling cutter: for processing groove and step surface, the knife teeth are in the circumference and the end surface, and can not feed along the axis when working. When the end teeth of the vertical milling cutter are passed through the center, the axial feed can be axial.
- 4. Carbide three-side milling cutter: used to process various grooves and step surfaces, with blade teeth on both sides and circumference.
- 5. Carbide Angle milling cutter: groove groove used for milling to a certain Angle, with single Angle and double Angle milling cutter.
- 6. Carbide saw blade milling cutter: for machining deep groove and cutting off workpiece, there are more knife teeth on the circumference. In order to reduce the friction when milling, blade on both sides of the 15 '~ 1 ° Angle. In addition, there are keyway milling cutter, dovetail slot milling cutter, t-shaped slot milling cutter and various forming milling cutter.
There are two main types of milling methods for carbide milling cutter's direction and rotation direction of milling cutter:
The first type is the milling, the rotation direction of the milling cutter and the cutting direction of the feed are the same, and the milling cutter holds the workpiece and cuts the final chip in the beginning of cutting. Inverse milling, the second is the direction of rotation of the milling cutter and cutting feed direction is opposite, cutter before start cutting must be slipping a on the workpiece, start with cutting thickness is zero, the cutting at the end of the maximum cutting thickness.
When milling, the workpiece is pressed to the workbench by cutting force, and the workpiece is removed from the worktable during milling. Because of the best cutting effect of milling, it is usually preferred to milling, only when the machine has the problem of thread clearance and the problem of unsolved problem.
The cutting edge of carbide milling cutter should bear the impact load every time it enters the cutting. The load size depends on the cross section, workpiece material and cutting type of the chip. In the ideal condition, the diameter of the milling cutter should be larger than that of the workpiece, and the axis of the milling cutter should always be slightly away from the center line of the workpiece. When the cutter is placed in the cutting center, it can easily produce burrs. Cutting edge into the cutting and cutting out the direction of the radial cutting force will continue to change, machine tool spindle can vibration and damage, the blade may rupture and processing surface will be very rough, hard alloy cutter slightly off center, cutting force direction will no longer fluctuations, cutter will receive a pre load.
When the axial line of carbide milling cutter or the edge line of the workpiece is superimposed or close to the edge of the workpiece, the situation will be serious, and the operator should do the relevant equipment maintenance work.
- 1. Check the power and stiffness of the machine to ensure that the required milling cutter diameter can be used on the machine tool.
- 2. The weight of the cutter in the spindle is minimized to minimize the impact of the milling cutter axis and the position of the workpiece on the impact load.
- 3. The suitable for the process of the correct cutter tooth pitch, to ensure that did not too much during the cutting blade mesh and artifacts caused by the vibration at the same time, on the other hand, in the narrow artifacts or milling milling cavity to ensure that there are enough blades and workpiece mesh.
- 4. Ensure that each blade is used to get the correct cutting effect when the chip is thick enough to reduce tool wear. The forward corner slot can be used to achieve a smooth cutting effect and minimum power.
- 5. The diameter of milling cutter is suitable for the width of workpiece.
- 6. Choose the correct main Angle.
- 7. Place the milling cutter correctly.
- 8. Use cutting fluid only if necessary.
- 9. Follow tool maintenance and maintenance rules and monitor tool wear. The maintenance of carbide milling cutter can prolong tool life and improve work efficiency.
Milling stainless steel in addition to the vertical milling cutter and carbide end milling cutter and the parts of the cutter material, the rest of the all kinds of milling cutter adopt high speed steel, especially high tungsten, molybdenum and vanadium high speed steel has a good effect, the tool life than W18Cr4V 1 ~ 2 times. The hard alloy plate for making stainless steel mill is YG8, YW2, 813, 798, YS2T, YS30, YS25, etc.
The effect of spray cooling method is most obvious, which can increase the durability of milling cutter more than double. If the normal 10% emulsion cooling is used, the cutting fluid flow should be guaranteed to be fully cooled. When the carbide milling cutter is milling stainless steel, the Vc=70 ~ 150m/min, Vf=37.5 ~ 150mm/min, and it should be adjusted according to the alloy plate number and the different materials.
The adhesion of stainless steel and strong melting ability are easy to stick to the blade of the milling cutter, making the cutting condition deteriorate. In reverse milling, the blade starts to slide on the hardened surface, increasing the trend of working hardening. The impact and vibration of milling are larger, and the cutter blade is easy to be broken and worn.
When machining stainless steel, the cutting edge should be sharp and bear the impact. Can use the big spiral Angle cutter (cylindrical milling cutter, end mill), spiral Angle b increased from 20 ° to 45 ° (designed.the gn = 5 °), the tool life can be increased by more than 2 times, because work at the moment of the milling cutter rake Angle g0e by 11 ° increased to more than 27 °, milling fast. But b value should not be again big, especially the vertical milling cutter with b 35 ° or less advisable, so as to avoid weakening the blade.
The stainless steel tube or thin wall with corrugated edge vertical milling cutter is used, the cutting is easy, the vibration is small, the chip is fragile, the workpiece is not deformed. High speed milling cutter with carbide end milling cutter and indexable end milling cutter can achieve good results.
1 cr18ni9ti with silvery white breadcrumbs end milling cutter, the geometric parameters for gf = 5 °, gp = 15 °, 15 °, af = = ap 55 °, 5 °, kr = k 'r = 35 °, 30 °, bg g01 = - = 0.4 mm, re = 6 mm, when Vc = 50 ~ 90 m/min, Vf = 630 ~ 750 mm/min, and a' p = 2 ~ 6 mm per tooth feeding up to 0.4 ~ 0.4 mm, milling force decreases 10% ~ 15%, and the milling power down 44%, also greatly improve the efficiency. Its principle is on the main cutting edge grinding out negative chamfer, milling artificially generated when the devolop tumor, instead of cutting edges for cutting, the devolop tumor of the anterior horn of gb of 20 ~ 302, as a result of the action of the main Angle, the devolop tumor caused by a knife before surface parallel to the thrust of the cutting edge of the chip to become vice flow, to take away the cutting heat, reduces the cutting temperature.
When milling stainless steel, use the milling method as far as possible. Asymmetric along the cutting edge milling method can guarantee smoothly cut off from the metal, chip bonding contact area is lesser, vulnerable to dump under the effect of high speed centrifugal force, so as to avoid blade to cut into the workpiece, chip impact before the knife blade surface spalling and crack phenomenon, improve the durability of cutting tools. The application of stainless steel materials is widely used in machining, milling, drilling and tapping. However, because the stainless steel has different characteristics from other general materials, processing stainless steel becomes a difficult problem for technicians!
Hard alloy drawing die
Hard alloy wire drawing die is made of high quality hard alloy, with high hardness, good thermal conductivity and small friction coefficient.Hard alloy wire drawing die (tungsten steel mould) is made of high quality hard alloy, with high hardness, good thermal conductivity and small friction coefficient. Cemented carbide drawing die, simple, strong corrosion resistance, impact resistance, low price is the distinctive features of this product, apply to black metal, large size wire drawing, and drawing conditions worse situations.
The hard alloy wire drawing die usually needs attention, equipment selection, wire material pretreatment, selection of suitable lubricant, abnormal treatment, aging and timely replacement, etc.
- 1. Equipment selection: according to the materials and drawing equipment you want to pull, the compression rate of each channel drawing die is reasonable, so that the Angle of the working area of each channel die is determined. (which type of drawing model is used)
- 2. Pretreatment of drawing materials: cleaning, rust removing, annealing, phosphating, etc., ensure the cleaning of materials.
- 3. Drawing powder, oil selection: use high quality drawing powder (lubricants, oil) to make the cooling work of drawing die.
- 4. Mold processing: if it is abnormal if appear when drawing die cracking, Fried die, die, wire, reducing, broken wires, such as high temperature, mould black, don't wear use question, please contact with the professional and technical personnel in a timely manner.
- 5. Replace the aging drawing die in time: when the drawing die reaches the service life, please replace the drawing die in time to repair the die, so as to avoid the use of wire drawing die for drawing materials.
Hard alloy wire drawing die is widely used in wire drawing. Wire drawing is a manufacturing process used to reduce or change the cross section of the wire by using a series of stretch plates or moulds. Steel wire, inserted into a steel casting tungsten carbide inside the "pen point".
|grade||density||The intensity of||hardness||application|
|YG6X||14.95||1800||91.5||Hole in the drawing for the production to be less than ￠6.00 mm wire drawing die.|
|YG6||14.95||1900||90.5||Used to make hole in the drawing to be less than ￠20.00 mm of non-ferrous metal rods and inner hole less than die of ￠10.00 mm pipe.|
|YG8||14.8||2200||89.5||Used to make drawing die for drawing steel and non-ferrous metal rod and pipe.|
|YG15||14||2800||87||It is used to make steel rod and tubing for drawing high shrinkage rate.|
The key points to be paid attention to in the processing of hard alloy wire drawing die, die set and die core. The main four steps of manufacturing: 1. 2. Fill the infill; 3. Drawing die sleeve processing; 4. Insert technology. Die blanks processing In sintering process, hard alloy wire drawing die core can produce contraction phenomenon. Different batch Numbers vary in composition, suppression and sintering process. Different parts of the mold are different from each other, often forming "saddle" or "flared mouth" form. Mould of billet dimension, although accord with standard of die blanks, but far more than the interference when mould suit set requirements, cause loaded with mold core under prestressed imbalance, mould service life is greatly reduced, therefore, must die blanks for cylindrical grinding, grinding machine is needed in using special fixture, with diamond grinding wheel grinding. Overfill with inlaid The inner hole diameter of the die is less than the outer diameter of the core, and the difference between the two is called the surplus. The overdose shall be determined according to the mould core size and deviation, drawing stress and insert method. Table 1 is the actual volume of the mold filling. There are two kinds of die sets with hot pressing and cold pressing, the cold pressure method is small, and the pre-pressurized stress is small, which is used to make the drawing die of soft metal. Die set of processing,The mould sleeve is formed by lathe turning, and the control points are as follows:
- (1) the inner diameter roughness must be 0. 80 a I. 6 m, which is conducive to working closely with mould sleeve;
- (2) the inner diameter of the mould sleeve shall correspond with the outer diameter of the die, to ensure the accuracy of each mold's overgain;
- (3) the inner hole of the mould sleeve must be parallel to the outer end of the mould, and ensure that it is perpendicular to the center line of the die hole.
- (4) the ellipticity of the inner hole should be as small as possible and should not be greater than 0. 02 mm. The outer surface of the mold cover should be light and uniform cooling after heating.
The cold pressing process is to press the mould pressing machine into the mould at room temperature. The cold pressure method is required to be accurate, and the dimensions of the mould core and die sleeve are high. The advantage is that it is not necessary to heat the equipment, save energy and reduce the cost.