News & Events
China's carbide industry statistics work will be held in Zhuzhou
Over the past decade, with the rapid development of China's economic construction, China's carbide products industry applications continue to expand, the annual output of new high, 2016 annual output has exceeded 28,000 tons. In order to meet the new development needs, to further do a good job of the national carbide industry statistical analysis of information for economic, social development and leadership decision-making to provide a scientific basis for our carbide industry statistics indicators were adjusted. To this end, China Tungsten Association Carbide Branch decided to March 31, 2017 - April 1 in Zhuzhou, held a national carbide industry statistical information and precision carbide parts, carbide tools, super Hard carbide materials and other content of the meeting. The conference was organized by the China Tungsten Industry Association Carbide Branch, organized by Zhuzhou BTCarbide Precision Carbide Co.,Ltd. The relevant matters of the meeting are as follows:
1, the enterprise is responsible for the statistical report of the Association of statisticians and the person in charge;
2, corporate information liaison and related person in charge.
Second, the main contents of the meeting:
China 's Carbide Industry in 2016 and Its Prospect.
2, China Tungsten Industry Association of statistical information on the requirements of the description.
3, 2016 national solid carbide industry statistics work summary.
4, in recognition of the national carbide industry "excellent statistical information officer" and "advanced individual".
5, discussion and discussion.
Management Technology of High Performance CNC Cutting Tool
The use of CNC machine tools for metal cutting, not only the aerospace manufacturing industry, the main metal cutting methods, but also in the entire industrial production to occupy the mainstream. In the NC cutting mode of change, production quality management has also undergone great changes. The traditional manual machine tool processing parts, the processing quality of individual processes more dependent on the skills of workers, and in CNC machining, the process staff not only need to be responsible for the development process, but also for CNC machining program preparation, and tungsten carbide CNC machine tool selection and technology Parameter development. So the NC machining efficiency and processing quality by the impact of CNC tool significantly.
Aerospace manufacturing processing methods to small batch, multi-species mixed processing, mainly relative to the mass production of the automobile manufacturing industry, in the part of cutting production, due to the difficult parts of the material and parts of the difficult structure of the difficult structure, Not only for high-performance carbide numerical control tool has an urgent need, and the appropriate tool management technology to improve the quality of CNC production has important significance and application value.
In the narrow sense of the tool management technology only involves the tool logistics management. In the automotive engine and other mass production applications in the tool management technology not only includes the tool logistics management, but also includes tool definition, cutting parameters, cutting data, tool adjustment and tool grinding, CAM interface, tool usage forecast. Through the application of tool management technology, the tool can be produced in the production of independent, by the specialized tool management services team management, in the production site to achieve tool distribution, reduce production costs. For the aerospace manufacturing industry, the special mode of production, this tool management technology there are many problems. Now the aerospace companies have built a more complete CAPP, ERP and PDM and other information management system, tool-related logistics management functions are already available. But the tool has its particularity, in the implementation of the process, not only need to know the shape of the tool, size, but also know the tool for processing materials and cutting parameters of choice.
The cutting process is a multidimensional complex time-varying system with machine tools, tools, parts, fixtures and processes. The cutting conditions corresponding to the cutting parameters and the processing effects obtained are affected by various parameters of the cutting system. It is difficult to establish a standard unified cutting Process system model to describe and optimize process parameters. As the main provider of the tool, the tool manufacturers often use the compromise plan, for the provided tool and the object to be processed, recommended for the process of cutting parameters or approximate processing cases, does not provide tool life and processing performance prediction, more dependent on the actual processing The results were roughly evaluated.
Cutting the database is mainly for the technical staff to develop specific process options, to provide machine tools, tool selection options and optimize the processing parameters. As the fine milling process system involves the processing of machine tools, tools, workpieces, fixtures, lubrication and cooling of all aspects of processing, and because of the process of dynamic time-varying characteristics, the optimal process parameters are often difficult to determine. This is also the main factor in the existing metal cutting database is difficult to practical.
For the special nature of aerospace manufacturing, high-performance CNC tool management technology should include tool performance evaluation, tool field applications, tool logistics.
Tool performance evaluation method
With the increasing complexity of the aeronautical structure, the difficult structure of the difficult structures is more and more. In the past, the tools selected by the basic cutting test often show significant performance differences for different structural features. In other words, the same kind of cutting tool in the cutting of different structural features, often will show a greater difference in cutting performance.
In order to evaluate the performance of the titanium alloy structural milling tool and to find the milling tool suitable for the aerospace titanium alloy structure, it is necessary to judge the performance of the cutting tool on the basis of understanding and familiar with the structural characteristics of the aerospace titanium alloy complex structure.
In order to optimize the titanium alloy milling tool and optimize the cutting parameters, a variety of titanium alloy test pieces are designed. Figure 1 is a reference to the machine performance test S-shaped design of a baseline sample, by defining a unified cutting track, not only can compare the cutting performance of the tool, but also for machine performance testing, cutting parameters for the personalized evaluation provided A reference method.
Based on the tool life and metal removal rate as the roughing evaluation index, the comprehensive evaluation model of tool performance was constructed. Four kinds of PVD alumina coated milling tools were designed and evaluated by WSM35, WSM35S, WSP45 and WSP45S. According to the machining test The results show that the performance of the cutting edge is WSM35S, WSP45, WSP45S, WSM35, and the performance of cutting the back cavity is WSM35S, WSM35, WSP45 and WSP45S. The use of reference parts for tool performance evaluation, a number of comparative tests show that the process can be developed to provide more reasonable cutting parameters.
Tool field application:
Tool site application refers to the process planning from the beginning of the tool selection, cutting parameters, life prediction, wear management, tool adjustment and tool replacement and other links. The basic process of tool selection is based on the structure of the machined parts, materials, through the tool samples, access to the relevant tools, tool holders, and recommended cutting parameters. The advantages and disadvantages of tool selection have a decisive influence on processing quality, processing efficiency and processing cost, and also affect the preparation of NC machining program. Especially in the aerospace industry commonly used titanium alloy, high temperature alloys and other difficult materials, the tool material, blade slot and cutting parameters are more sensitive to any wrong match will lead to increased wear or reduce the efficiency of the tool. As the tool selection depends more on the "knowledge", Walter first provided TEC-CCS tool management support software to provide users with the overall milling cutter, hole processing tool recommendations; Kenner metal also introduced NOVOTM tool management software, Parameter constraints for the user to provide tool recommendations. The software also provides cutting force and cutting torque, power calculation function.
Give full play to the performance of high-performance cutting tools, not only need to select the appropriate tool according to the processing object, but also in the process of preparation for the tool configuration reasonable cutting parameters. Since the machining of the parts on the machine tool is a multivariable complex time-varying process, it is necessary to adjust the cutting parameters recommended for the tool according to the machine status, the parts clamping method, and the machining allowance.
As the titanium alloy and superalloy are easy to work harden, appropriate feed and cutting depth should be used to keep the cutting under the hardened layer. In the application of ceramic cutting tool, the cutting speed usually requires more than 80 m / min to fully utilize the hardness difference between ceramic and superalloy for efficient cutting. In milling, the cutting line speed needs more than 600 m / min to achieve similar The same time due to the brittleness of ceramic cutting tools, the application of coolant or micro-lubrication, the liquid surface in the micro-cracks on the surface of the expansion of the crack to increase the speed of expansion, speed up the tool damage, should be used as air-cooled or dry cutting.
In the actual processing process, the tool cutting effect feedback is the tool, the cutting parameter improvement and the tool cost control important basis. The existing workshop production management system, the actual cutting tool life, the processing process for the field operator's oral report, if the relevant data statistics will cause the field management workload surge. How to obtain efficient, timely and comprehensive data on the effect of the relevant tool in production is still to be further explored.
According to the domestic aerospace manufacturing industry on the quality of CNC cutting parts survey, the majority of quality problems are due to simple errors. Such as CNC machine tools in the processing of large parts of the process, due to cutting fluid injection, the scene noise and other factors, the operator negligence lead to the wrong tool call, tool length error, tool wear and other issues is particularly common. Application of technical means to carry out such anti-error treatment has a good effect, such as the establishment of tool distribution system in the workshop, according to the task of each machine day to provide a list of tools, by the staff in the tool presetting instrument on the tool measurement confirmation, To correspond to the machine tool magazine, in the program in accordance with the expected tool life for tool change tips.
Tool management system
The main goal of high-performance cutting tools is to increase the metal removal rate during the roughing stage and improve the surface quality during the finishing stage. In mass production, due to the combination of machine tools and workpieces, the productivity is relatively fixed, the tool variety and the consumption quantity are easy to be statistically suitable for tool management. However, in the aerospace manufacturing industry, small batch, multi-species mixed production, tool varieties and consumption of the number is not easy to accurately statistics for the tool management system has a greater difficulty.
Tool management system not only for the manufacturing workshop logistics management, tool installation and adjustment, machine tool tooling and other processes for tool-related data management, but also in the process of preparation process to provide tool geometry data, cutting parameters, and in the production planning process Of the machine - the workpiece - fixture - tool matching, and can effect prediction.
With the manufacturing system of information technology in the aerospace enterprises to gradually promote the tool management system should be easy and existing PLM, ERP, CAPP and other systems for a high degree of integration, Figure 3 shows the tool management system and manufacturing information between other systems Association.
Tool management technology under large data age
The tool will produce a large amount of data in practical applications, such as the cutting data and machining efficiency statistics of each knife, the state change data during processing, which is important for decision making of process quality improvement, tool improvement and cost control significance.
The large data generated by the tool in the application and its storage, statistics and analysis will be the key to the tool management system that can really play a role in a complex manufacturing environment.
The data set in the tool management system can be divided into four categories.
(1) Tool base data. This part of the data is mainly provided by the tool manufacturer, including the geometric information of the tool, the shank, the accessories, and the basic cutting amount recommended by the material classification, which can be updated and maintained by the tool manufacturer.
(2) Tool logistics data. The tool is purchased, stored and consumed by the user during the production process, and is managed and maintained by PLM and ERP system.
(3) tool cutting data. It is recommended for machine tool-tool cutting under the tool preparation and production plan. This kind of data is based on the basic cutting quantity provided by the tool manufacturer, combined with the structural characteristics of the parts, Post-optimized data, this kind of data is a kind of machine dynamic performance constraint data, there are tool management system for personalized management.
(4) Tool application data. Mainly refers to the tool in the production process to produce all kinds of data, the current data in the production is not recorded and managed. This type of data is generated by the CNC system of the machine, such as the instantaneous cutting load (power, current), can be provided by the CNC machine tool output interface for data statistics; tool wear and cutting status evaluation class data such as tool wear and surface quality Data can be recorded by the operator statistics, or in the machine tool library, etc. to install the sensor for classification statistics. Tool application data will continue to produce in the production process, the formation of large data, the processing of such data will be tool management technology in the future development trend.
Tungsten raw materials market power is still, tungsten prices are more firm
Tungsten goods prices in a short period of time rapid rise, up to now, to tungsten concentrate, APT, tungsten carbide, led by the raw material products have emerged in varying degrees of rise. Accompanied by price increases at the same time, tungsten enterprises reluctant to sell the attitude of the tungsten ore spot less, smelting plant procurement difficulties and sales of cautious, tungsten powder market orders for procurement of raw materials because of doubt and pricing difficulties.
Tungsten concentrate market large-scale tungsten mines to resume production, but the enterprise's supply and marketing impact on the spot market is limited. While the bulk of the mine production conditions of the market is poor, not yet positive production and some business bullish judgment will affect its attitude to sell the mine. APT mainstream offer concentrated in the 11.7-12 million / ton, spot cash transactions concentrated in the 11.6-11.8 million / ton. With the product smelting ore in short supply, according to the raw material tungsten concentrate purchase price conversion, cash APT costs are more than 116,000 yuan / ton. Raw materials become the constraints of the smelter price adjustment is not even an important reason for the offer. Tungsten powder market situation embarrassing, some procurement of the appropriate APT tungsten powder enterprises can only suspend the offer. Mainstream tungsten carbide offer concentrated in the 183-186 yuan / kg, according to the conversion of raw materials, the cost of tungsten carbide are more than 185 yuan / kg, with the carbide price adjustment began, the current price of rigid enterprises to accept the price of response to better than The last round of price increases.
Forecast, tungsten raw material market is still power, the mainstream large-scale tungsten enterprises on the current market is still positive and optimistic attitude, tungsten raw materials from the normal supply takes time, short-term tungsten prices are still relatively strong.
Nano-structure wear-resistant corrosion-resistant carbide coating research has made significant progress
Beijing University of Technology in the 2013 annual key project "high-performance nano-structure of the WC-based coating of key technologies and control mechanism of the project (project number: 2131001)" and other projects with the support of the development of low-temperature solid-phase in situ synthesis of nano WC-Co (tungsten carbide-cobalt) composite powder, the synthesis temperature is 400-600 degrees lower than that of the previous carbonization temperature, and the production cycle is shortened by 30% -50% compared with the traditional process. The prepared composite powder has pure phase And the control of nano-structure WC-based thermal spraying materials with high bulk density and high flowability. The technology of resolving decarburization of nano-powder in thermal spraying was fundamentally solved. Difficult to develop high hardness, strong wear and corrosion resistance, high surface quality of the carbide protective coating.
The project has been published in SCI papers 14, EI papers 15; access to national invention patent licensing 6; developed carbide coating has been used in aerospace, steel rolling, coal mining and other important engineering areas to accelerate China's high performance Development of WC - based Coatings for Nanostructures.