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Shanghai shaped carbide die mold production prices

When drawing the wire, the working cone angle is too large (equivalent to the compression ratio is too small), so that the wire into the drawing die contact point is too close to the sizing belt (for example, with 14. mold produces 16% compression rate). In this example, the deformation zone is relatively short, so that the wire deformation rate is accelerated, and produce a lot of heat, easily lead to lubrication failure. If the cooling is bad, it will affect the wire structure, and exacerbate the mold consumption.

If the angle is large or the compression rate is small, the contact point will be closer to the sizing belt. When the wire is flowing into the sizing belt, it is difficult for the wire to transition smoothly to the sizing area due to the angle of the cone. Concave, resulting in reduced diameter, if the material strength is too low will lead to shrinkage or oval phenomenon. Although the lubrication area is relatively lengthened and begins to provide good lubrication at the moment, it reduces the contact surface lubrication pressure and produces a vortex effect, resulting in a reverse flow of the lubricating powder out of the die hole, reducing the lubrication effect, Adverse effects, and ultimately lead to lubrication failure, surface cracks, scratches, mold wear, wire diameter is difficult to control.

The working angle is too small, leading to the line contact point near the top of the working cone, so that the deformation area is relatively longer, so that the wire drawing machine on the wire produced by the residual work increased, resulting in a lot of heat, increase the wire drawing machine power consumption. In addition, the lubrication area is reduced and the lubricating effect is weakened. In the deformation zone, it will run out of the residual wire surface lubricating powder. When the tensile stress is too large, in the sizing area is easy to cause axial elongation, shrinkage and elliptical problems, will eventually lead to poor lubrication, resulting in metal debris and broken wire, overheating, shrinkage. The.

  • (1) surface pretreatment: for the surface of dirt, adhesion of more impurities in the wire, first after cleaning, drying and then pull; for the surface of the more oxide wire, first through the acid, drying And then pull; for the existence of the surface from the skin, pits, heavy skin and other phenomena of the wire, but also through the grinding machine after grinding and then pull;
  • (2) heat treatment: the hardness is too large or uneven hardness of the wire, first by annealing or tempering to reduce the hardness, and to maintain a good hardness of the wire again to pull.

In metal press processing, the tool that forces the metal through the die, the metal cross-sectional area under external force, and obtains the desired cross-sectional shape and size is called a drawing die.

Drawing wire mold widely used, such as electronic devices, radar, television, instrumentation and aerospace used in the high-precision wire and the commonly used tungsten wire, molybdenum wire, stainless steel wire, wire and cable wire and a variety of alloy wire are Made out of the diamond drawing die due to the use of natural diamond as raw materials, which has a strong wear resistance, high service life. Drawing die sets of production processes, including die, draft, turning and several other process steps. Drawing die is a wire through a mold, so that it from coarse to fine, and gradually reach the size of people need, this special mold is the drawing die. Drawing die mold core is generally made of natural diamonds, synthetic diamonds (artificial diamonds There are GE, PCD, synthetic materials, etc.). Copper wire drawing die is a soft wire drawing die. There are hard wire drawing die, such as pull tungsten wire, tungsten wire drawing die compression area angle is relatively small, 14 degrees

Drawing die, including diamond drawing die, carbide drawing die, plastic drawing die,,tungsten carbide wire drawing dies etc.

JACS:Preparation of ultrafine tungsten carbide nanoparticles by limiting pyrolysis of MOF For efficient electrocatalytic hydrogen production

Hydrogen as an alternative to fossil fuels to achieve sustainable development of the ideal clean energy, hydrogen in recent years, research and development has become an important task in the field of energy. Electrochemical Hydrogen Evolution (HER) is the most economical and sustainable hydrogen production in the hydrogen industry, and efficient catalysts play an important role in promoting hydrogen evolution. Molybdenum and tungsten compounds have a special electronic structure, can replace the precious metal platinum for catalytic hydrogen evolution process. But the aggregation of such catalyst materials is difficult to avoid, to a certain extent, limit the molybdenum / tungsten-based catalyst catalytic activity. Therefore, as an effective way to improve the catalytic activity, the controllable preparation of small-sized catalysts is also a hot spot in the current scientific research.

Recently, Tsinghua University Li Yadong academician, Professor Sun Yat-sen Zhang Jie Peng and Dr. He Chunting (co-author of the report) reported the use of MOF as a template template preparation of ultra-fine tungsten carbide nanoparticles, and as a catalyst for efficient electrocatalytic hydrogen production work, related The results were published in the Journal of the American Chemical Society, entitled "Cage-Confinement Pyrolysis Route to Ultrasmall Tungsten Carbide Nanoparticles for Efficient Electrocatalytic Hydrogen Evolution". RHO zeolite structure of ethyl imidazole zinc, that is, MAF-6, with large nano cages and small windows of the characteristics of the larger object molecules can show a limited role. The ultrafine tungsten carbide nanoparticles (average size of about 2nm) were successfully prepared by pyrolysis using MAF-6 as the template and carboxyl tungsten as guest. When the material is used as electrolytic hydrogen to catalyze hydrogen, the overpotential of the current density of 10mA cm-2 in the 0.5M H2SO4 electrolyte is 51mV and the Tafe slope is 49mV / dec. At the exchange current density, the value is twice the commercial Pt / C, better than all currently reported molybdenum / tungsten-based catalysts. At the same time, the catalyst exhibits excellent stability and anti-aggregation after a long period of electrolysis.

Carbide Basics1

Carbide basic knowledge; Carbide is made of refractory metal hard compound and bonded metal through the powder; 1, Carbide composition; commonly used carbide to WC as the main component, according to whether to join other; (1 (WC + Co) Carbide (YG); it is composed of WC and Co, with high bending strength toughness, lead; (2), tungsten and titanium cobalt (WC + TiC + Co (Tungsten tantalum cobalt (WC + Ta) cemented carbide is made of refractory metal hard compound and sticky The alloy has a high hardness, wear resistance, strength and toughness, heat resistance, corrosion resistance and a series of excellent performance, especially its high hardness and wear resistance. Nature, even at 500 ℃ temperature is basically the same, at 1000 ℃ still have a high hardness. Carbide is one of the commonly used materials in the metallurgical industry, the following familiar and understand the basic knowledge of cemented carbide , To strengthen the understanding of industry knowledge.

  • 1, carbide composition:Commonly used carbide to WC as the main component, according to whether the addition of other carbides and divided into the following categories
    • (1), tungsten cobalt (WC + Co) cemented carbide (YG):It is composed of WC and Co, has a high bending strength toughness, good thermal conductivity, but the heat resistance and wear resistance is poor, mainly used for processing cast iron and nonferrous metals. Fine grain of YG type cemented carbide (such as YG3X, YG6X), in the same amount of cobalt, the hardness of wear resistance than YG3, YG6 high, slightly less strength and toughness, suitable for processing hard cast iron, austenitic stainless steel , Heat-resistant alloys, hard bronze and so on.
    • (2), tungsten-titanium-cobalt (WC + TiC + Co) cemented carbide (YT):As TiC hardness and melting point are higher than WC, so compared with the YG, its hardness, wear resistance, red hardness increases, high bonding temperature, strong antioxidant capacity, and at high temperatures will produce TiO 2, can reduce Bonding. But the thermal conductivity is poor, low bending strength, so it is suitable for processing steel and other tough materials.
    • (3), tungsten-tantalum-cobalt (WC + TaC + Co) cemented carbide (YA):TaC (NbC) is added on the basis of YG Carbide to improve the room temperature, high temperature hardness and strength, thermal shock resistance and abrasion resistance, and can be used for processing cast iron and stainless steel.
    • (4), tungsten-tantalum-cobalt (WC + TiC + TaC + Co)) cemented carbide (YW):TaC (NbC) is added on the basis of YT cemented carbide to improve bending strength, impact toughness, high temperature hardness, antioxidant capacity and abrasion resistance. Both processing steel, but also processing cast iron and non-ferrous metals. So often referred to as universal cemented carbide (also known as universal cemented carbide). At present, mainly for processing heat-resistant steel, high manganese steel, stainless steel and other difficult processing materials.
    • (5), WC: molecular weight 195.86; Tungsten carbide:Nature: chemical formula WC. Black hexagonal crystal. Density 15.63g / cm3 (18 ℃). Melting point,(2870 ± 50) ° C. The boiling point of 6000 ℃. Mohs hardness of about 9. Do not dissolve in water, soluble in nitric acid and hydrofluoric acid mixture and aqua regia. Strong acid resistance. hard. Modulus of elasticity. The conductivity is 40% of the metal. Chemical stability. Less than 400 ℃ when not with chlorine. With carbon black and tungsten powder heated to 1400 ~ 1500 ℃ in the system. Large quantities for high-speed cutting tools, furnace structural materials, jet engine parts, metal ceramic materials, such as resistance heating elements.
    • (6), TiC: Molecular formula: TiC Boiling point: 4820 ° C:Nature: gray black crystal. Melting point of about 3200 ℃. Not with hydrochloric acid. Can be made of bone charcoal and titanium dioxide in an electric furnace. TiC has a thermal expansion coefficient (7.4 × 10-6 ℃ -1), TiC grains have five slip lines, and at 800 ℃ or more ductility; is an important component of cemented carbide. Used as a cermet, with high hardness, corrosion resistance, good thermal stability characteristics. It can also be used to make cutting tools. Used as a deoxidizer in the steelmaking industry.
  • 2, the use of carbide:Carbide has a series of excellent performance, uses a wide range, with the passage of time is still expanding, the main purpose is as follows:

    Cutting tools: Carbide can be used as a variety of cutting tools. China's cutting tools, carbide dosage accounts for about one-third of the total carbide production, which used for welding tools accounted for about 78%, for the indexable tool accounted for about 22%. The CNC tool with carbide can only be translocated with about 20% of carbide carbide, in addition to the overall carbide drill, the overall carbide small blade saw blade, carbide cutting tools such as micro-diamond.

    Geological mining tools: Geological mining tools are also a major use of cemented carbide. China's mineral hard

    Alloy accounts for about 25% of the total production of cemented carbide, mainly for the impact of drilling with a drill bit, geological exploration with the drill bit, mine oil field with the hole drilling, cone drilling and cutting machine picking, building materials industry impact drill The Mold: Carbide used for all types of mold about 8% of the total production of carbide, with drawing die, cold heading die, cold extrusion die, hot extrusion die, hot forging die, forming die and drawing Tube rods, such as long mandrel, spherical core rods, floating Rui rods, etc., nearly ten years rolling wire with various types of carbide roll rapid growth in the amount of China's carbide carbide carbide carbide production 3% of the total.

    Structural parts: Carbide used to make a lot of structural parts, such as rotary seal ring, compressor piston, lathe chuck, grinding machine mandrel, bearing journal and so on.

    Wear-resistant parts: made of hard alloy wear parts are nozzles, rails, plungers, balls, tire anti-skid nail, snow snow board, etc. cited numerous.

    High pressure and high temperature with the cavity: the most important use is the production of synthetic diamond with the top hammer, cylinder and other products, the top hammer, cylinder with carbide accounted for 9% of China's total production of cemented carbide.

    Other uses: Carbide use more and more widely, in recent years has been expanding in the civilian areas, such as bracelet, case, senior luggage zipper head, carbide trademark and so on.

  • 3, carbide classification
    • Carbide classification and use, until the official release of national standards before the relevant domestic books, magazines, information in the expression is not strictly standardized, usually according to the classification of alloy composition, the use of expression is more dispersed. Tungsten carbide-based cemented carbide: alloys such as WC-Co, WC-TaC-Co, WC-TiC-Co, WC-TiC-TaC-Co, WC-Ti-TaC-NbC-Co, As the main ingredient.
    • Titanium carbide or titanium carbonitride cement: a cement based on TiC or Ti (C, N) as a base and Ni-Mo as a binder. This kind of cemented carbide in recent years there are many new progress, such as Ta, W and other heavy metal elements of the multi-compound carbide solid solution to join the development of high-performance Ti (C, N) -based cermet.
    • Carbide-based Carbide: Cr3C2-based, Ni or Ni-W as a binder and the composition of the cement, usually used for wear-resistant corrosion-resistant parts, in recent years also used in large quantities for ornament parts Such as bracelet.
    • Steel-based cemented carbide: TiC or WC-based, steel as a binder and composed of a hard alloy, is a machining and heat treatment of the alloy, is between the traditional carbide and alloy steel Between a kind of engineering materials.
    • Coated cemented carbide: usually refers to the toughness of the tungsten carbide based carbide substrate by chemical vapor deposition or physical coating method, coated with a few microns thick TiC, TiN, Ti (C, N), Al2O3 and the like Hard compounds produced.

The use of carbide cutting tools

Structural parts: Carbide used to make a lot of structural parts, such as rotary seal ring, compressor piston, lathe chuck, grinding machine mandrel, bearing journal and so on.

Wear-resistant parts: made of hard alloy wear parts are nozzles, rails, plungers, balls, tire anti-skid nail, snow snow board, etc. cited numerous.

Cutting tools: Carbide can be used as a variety of cutting tools. China's cutting tools, carbide dosage accounts for about one-third of the total carbide production, which used for welding tools accounted for about 78%, for the indexable tool accounted for about 22%. The CNC tool with carbide can only be translocated with about 20% of carbide carbide, in addition to the overall carbide drill, the overall carbide small blade saw blade, carbide cutting tools such as micro-diamond.

Mold: Carbide used for all types of mold about 8% of the total production of carbide, with drawing die, cold heading die, cold extrusion die, hot extrusion die, hot forging die, forming die and drawing Tube rods, such as long mandrel, spherical core rods, floating Rui rods, etc., nearly ten years rolling wire with various types of carbide roll rapid growth in the amount of China's carbide carbide carbide carbide production 3% of the total.

Geological mining tools: Geological mining tools are also a major use of cemented carbide. China's carbide cement carbide carbide production accounts for about 25% of the total, mainly for the impact of drilling with the drill bit, geological exploration with the drill bit, mine oil field with the hole drilling, cone drilling and cutting machine pick , Building materials, such as the impact of drilling.

High pressure and high temperature with the cavity: the most important use is the production of synthetic diamond with the top hammer, cylinder and other products, the top hammer, cylinder with carbide accounted for 9% of China's total production of cemented carbide.

Other uses: Carbide use more and more widely, in recent years has been expanding in the civilian areas, such as bracelet, case, senior luggage zipper head, carbide trademark and so on.