The 6th International Conference on Superhard Materials (3)

[China Superhard Materials News] On November 16, 2013, the 6th Zhengzhou International Superhard Materials and Products Seminar was held in Dahe Hall, 5th Floor, Zhengzhou International Convention and Exhibition Center Conference Center. This seminar was organized by China Machine Tool Industry Association. The Superhard Materials Branch is co-sponsored by a number of industry organizations such as the United Nations Superhard Materials and Products Engineering Technology Research Center.

The combined application of different types and different particle size metal prealloyed powders has distinct characteristics, especially the combination application of fine particle alloy powders. The combination of fine particle atomized alloy powder and iron-copper alloy prepared by chemical one-step method can greatly improve the comprehensive mechanical properties of the sintered product and improve the sharpness and service life of the tool. The combined application of fine particles and high-activity alloy powders will be the future development trend, and functional combination can be realized to simplify the production process and promote the development of the industry.

The report studied the cold pressing and hot pressing sintering properties of DFC25 prealloyed powder, and analyzed the properties of sintered body hardness and bending strength. The results show that the hardness and flexural strength of DFC25 prealloyed powder increase with the increase of sintering temperature. When the hot pressing temperature is 780 °C and the pressure is 20 MPa, the hardness of the sintered body is 52HRB and the flexural strength is 748MPa. The powder is applied to the production of circular saw blades, and the cutting speed and life of the saw blade can be substantially reduced, and the amount of precious metals such as copper and nickel can be greatly reduced, and the manufacturing cost of the tool can be reduced, compared with the single-mixed powder carcass. At the same time, the tooth strength of the cutter head is significantly improved, which improves the safety of the saw blade.

By adding different proportions of sub-nano prealloys in the metal matrix, the effects of the prealloyed powder on the metal matrix density, hardness, flexural strength and the holding power of the diamond were analyzed, and the base metal matrix was added and joined. The comparison of the diamond metal carcass cutting shows that the performance indexes of the carcass added with the sub-nano prealloyed powder are greatly improved, which is close to the performance index of the metal carcass with a certain amount of diamond, and can replace the metal carcass to a certain extent. Part of the drilling powder, in order to more effectively and economically improve the performance of diamond tools.

The water atomized iron-copper prealloyed powder JF-O1 with different mechanical properties was selected, and the influence of bending strength and sintering hardness on the cutting performance of the prepared granite saw blade was investigated. When the oxygen content of the prealloyed powder is less than 3000 ppm, the higher the bending strength of the powder sintered body, the better the sintering density of the corresponding saw blade carcass, the higher the bending strength, and the stronger the mechanical holding power of the carcass to the diamond. The sharpness and service life of the saw blade can be significantly improved within a suitable range of sintering hardness.

The report mainly carried out the grinding test of the brazed PCBN abrasive tool, and reconstructed the abrasive wear morphology by fractal method. The fractal analysis of the abrasive crushing behavior was carried out. The main conclusions are as follows:1. During the grinding process, the self-sharpening effect caused by the micro-crushing behavior of PCBN can be reconstructed by 3D video microscope. The obtained model can clearly reproduce its wear characteristics. 2 Fractal dimension and PCBN micro-crushing behavior Relevant, thereby quantitatively characterizing the self-sharp effect produced by the micro-crushing behavior of PCBN.

In this report, a single-layer vacuum brazing CBN grinding wheel was developed. The vacuum brazing process was used to introduce TiH2 into the Cu-based brazing material for experimental analysis. The effects of different brazing temperatures on CBN were compared, and the CBN abrasive grains were properly exposed. In the state of height, the thermal damage and stress damage are fully reduced, and a strong and effective metallurgical combination between the CBN abrasive grains, the brazing material and the 45# carbon steel substrate is achieved, and the high-efficiency grinding of the vacuum brazing CBN grinding wheel is further realized. cut.
In this report, a single-layer brazed cubic boron nitride} (CBN) grinding wheel was used to grind hardened 20CrMnTi. The influence of grinding amount on grinding temperature was analyzed. The results showed that with the feed rate and As the grinding depth increases, the grinding temperature increases. Compared with the white corundum grinding wheel used in traditional grinding machining, it is found that the CBN grinding wheel can greatly reduce the grinding temperature, and the maximum reduction can reach 64.9% under the grinding amount used. Therefore, the control of the grinding temperature In terms, the single-layer brazed CBN grinding wheel performs better. In addition, the report is based on the ABAQUS platform, and the finite element simulation of the grinding test is carried out. It is found that the calculation results are basically consistent with the experimental data, the error can be controlled within 10%, and the temperature variation law is also consistent, indicating that the model is It is effective to calculate the grinding temperature of 20CrMnTi.

The report explains the advantages of superhard material brazing tools. By explaining the technical points of the vacuum brazing equipment and the development factors of the brazing operation process, it is further explained how to make superhard material tools by vacuum brazing.


The report uses a vacuum brazing process to prepare a multi-layer diamond drill bit using a nickel-based or copper-based brazing material according to the slit-inlaid structure, and performs a granite drilling test. The statistical analysis method is used to summarize the thickness of three kinds of cutter heads (0.8mm, 1.2mm, 1.6mm) and three kinds of gap spacing (0.8mm, 1.2mm, 1.6mm) and nickel-based and copper-based solders. Failure of 18 multi-layer diamond drill bits. The results show that the nickel-based and copper-based brazing filler metal have achieved a firm combination of diamonds; the multi-layer diamond drill bit brazed with copper-based brazing material has excellent self-sharpness under the condition of 1.2mm cutter head thickness and 1.2mm gap spacing. High sharpness and longer service life.

The report comprehensively discusses the performance characteristics of N68-N83 series nano ceramic bond, key technical indicators and application development of ceramic bond superhard tools. It is pointed out that the ceramic bond superhard tool has the advantages of adjustable structure, good self-sharpness, long wear life, no pressure-free sintering in the air of protection atmosphere, and high-volume production in large quantities. The nano-ceramic binder solves the long-term contradiction of low melting and high strength. The sintering temperature is as low as 680 ° C, and the flexural strength of the binder is higher than 100 MPa. According to the requirements of different tools, it can be sintered at a temperature range of 680-850 ° C, and the porosity is 0~95% range adjustment; suitable for diamond and CBN tool manufacturing in the 60-mm to W0.5 full-grain range.

The report is aimed at the requirements of high hardness, high wear resistance and thermal stability of PCBN materials for dry cutting tools. Through the preparation of TiNo.3/AlN/CBN composite sintered bodies, SEM, EDS, XRD and other analytical methods were used to obtain all PCBN consisting of CBN, TiN0.3, TiNx and A1N has no low melting point and low hardness phase, which solves the low temperature sintering problem of covalent bond compounds such as TiN, AlN, etc., and lowers the sintering temperature; through the bonding agent and PCBN Performance testing to match the performance of the PCBN bond to dry cutting tools. The effects of different fillers on the performance of resin diamond grinding wheels were studied by measuring the mechanical properties and grinding performance of resin diamond grinding wheels for building ceramics. The results show that under the premise of determining the content of diamond, polyimine and auxiliary materials, when the copper powder is 10vol%, the zinc oxide is 5vol%, and the cryolite is 9vol%, the strength and hardness of the resin diamond grinding wheel are higher, sharpness and wear resistance. Good performance and good performance.

This report examines the effect of the amount of ZnO added on the properties of ceramic binders. The experimental results show that the refractoriness of the binder decreases with the increase of Zn0 content; when the addition amount of Zn0 is more than 4 wt%, the refractoriness of the binder is not obvious. The addition of 4 wt% of Zn0 can cause a significant decrease in the expansion coefficient of the binder. The addition of Zn0 also provides a certain increase in the flexural strength of the binder.

This report classifies the diamond grinding wheel used in the process of machining carbide saw blades. By investigating the influence of different addition amounts of glass fiber and platinum disulfide on the performance of the grinding wheel, the quality of the machined workpiece is affected. The optimum addition amount is 7.5 vol% of glass fiber and 5 vol% of platinum disulfide. The surface roughness and brightness of the workpiece processed by the hardwood woodworking saw blade prepared by this formula can meet the requirements of high-end customers, and the comprehensive service life of the grinding wheel. Increase by 30% to 67%. The preferred grinding wheel not only has a direct effect on the hard alloy woodworking saw blade, but also has a certain reference effect on the saw blade processing in other industries.
The report uses two cup-shaped diamond grinding wheels with the same parameters to perform ultrasonic-assisted grinding and ordinary grinding tests on SiC ceramics. After removing a certain volume of material, the corresponding grinding force and the roughness of the workpiece surface are measured. The three-dimensional video microscope was used to track the abrasive grains on the grinding wheel. It is found that the main wear form of the grinding wheel used for ultrasonic assisted grinding under the test conditions is wear and wear, and there is no phenomenon of abrasive falling off on the grinding wheel. The addition of ultrasonic vibration in ultrasonic assisted grinding is beneficial to reduce the grinding force, but as the wear of the grinding wheel increases, the reduction of the grinding force caused by ultrasonic vibration is reduced. The addition of ultrasonic vibration also reduces the roughness of the ground surface. As the wear of the grinding wheel increases, the surface roughness of the grinding does not change much.
The report outlines the limitations of current lubricants and the unique advantages of nanodiamond lubricants. The antifriction and antiwear effect was tested using an SRV reciprocating frictional wear tester. The results show that both the bite time and the wear scar depth can be significantly reduced.

The report analyzes the problems that have arisen in drilling engineering in recent years. Based on the hotspots in the research and application of hot-pressed diamond drill bits, it is based on practice and summarizes some insights. The application of cold press forming and granulating technology and the sintering process combining cold pressing and hot pressing methods are proposed. The design idea of ​​drilling hard and compact rock drill bit is put forward, and the design and manufacturing method of replacing the electroplated drill bit with hot pressing bit is proposed. . At the same time, it is believed that the performance of the drill bit, the nature of the rock and the drilling process technology are inseparable systems; the design and selection of the drill bit is inseparable from the nature of the rock and the drilling process technology. These conclusions are useful for both the drill manufacturer and the user.
The report compares the physical and mechanical properties of the WC-Cu based formulation system at different sintering temperatures and the relevant performance indexes of the WC-663Cu-based formulation system. A set of basic formulations is determined for the deep hole drill bit under the new process. The results show that the WC-Cu formulation system has better comprehensive mechanical properties at 850 °C sintering temperature; the WC-Cu-based formulation has better flexural strength, impact toughness and wear resistance than the WC-663Cu-based formulation. Damage and the strength of the diamond particles.

The report uses electrolytic iron powder, hydroxy iron powder, P-Fe powder, reduced iron powder, white cast iron powder and gray cast iron powder to prepare diamond grinding blocks to grind ceramic floor tiles with sharpness. And wear time shows a big difference. The reasons for these differences are analyzed and it is believed that the selection of reasonable iron powder can significantly optimize the performance of diamond grinding blocks.

This report focuses on the new developments of domestic six-face presses in supercharged source, overpressure and pressure relief technology in recent years. The principle and application of double-acting reciprocating supercharger are analyzed in detail, showing the proportional overflow. The principle of valve and proportional flow valve in overpressure speed control, the application of proportional stop valve in slow pressure relief is analyzed.

First, use the SolidWorks software to establish a three-dimensional solid model of the hinge beam system according to the design requirements. Secondly, the finite element analysis model is established in ANSYS Workbench software and the static analysis is carried out. The stress distribution and deformation of the diamond press structure under working conditions are obtained. Thirdly, the model is converted into a parametric model and imported into ANSYS Work-bench. Through the analysis of the structural characteristics and stress of the hinge beam, the main volume is selected by the stress value of the part volume and several stresses. The structural dimensions are design variables (such as the bottom chamfer of the cylinder, the thickness of the lug, the distance between the two lugs, and the chamfering of the upper and lower lugs), so as to reduce the stress without increasing the amount of material. value. Finally, to reduce the stress concentration at the joint between the lug and the cylinder, add two rounded corners at the joint and optimize the radius of the two corners.

The report provides an accurate and reliable design method for the development of the new diamond six-face press. With the CAE platform of ANSYSWorkbench, it helps to improve the design and analysis level of mechanical parts, shorten the development cycle and save costs, which is of great significance for the design and improvement of diamond presses.

With the development of global technology, the application of diamond has evolved from traditional geological drilling and stone cutting to more and more industries, such as aerospace, airship, high-speed railway, automobile manufacturing, semiconductor, solar energy, etc. The demand is growing rapidly. In the past, China imported a large amount of foreign products because of the lack of such varieties. Nowadays, several large diamond manufacturers in China have been able to produce fine particles (400~1200 mesh) of diamonds in batches after years of research and development. The author's company learned through investigation that the company that produces such diamonds can only use the original model to perform multiple selections because there is no suitable shape selection equipment for fine particles. However, the effect is still not satisfactory, especially It is basically 600 years to select the shape, the phenomenon of mixing is very serious, so that the business sales, especially the product price is greatly affected, and a new type of equipment is urgently needed to solve the above problems.

To this end, our factory has set up a research team since 2009 to develop a shape selection machine specially designed for the selection of fine-grained diamonds. This article introduces the performance, technical indicators and some details of the development of the machine to everyone.
With the development of new materials and the development of synthetic materials technology, CFRP composites are widely used in aviation, aerospace, new energy, and automobiles due to their high specific strength, high specific modulus, good fatigue resistance, and excellent heat resistance. And many other fields. However, when CFRP composites are processed by conventional cutting tools, the tool has a short service life, low processing efficiency, and poor processing quality. In view of the unique high hardness and high wear resistance of PCD tools, this paper develops the influence of mechanical cutting characteristics, microscopic failure mechanism and PCD down-drilling geometric parameters of CFRP composites on the processing quality of CFRP composites. PCD drilling tools for composite processing provide some help for the processing of CFRP composites.

In order to improve the heat resistance and strength of superhard material resin abrasives, tung oil was used to modify phenolic resin (PF). The comprehensive thermal analysis showed that the modified PF lost 6.30% between 100~320 °C and weight loss between 320 and 600 °C. 62.42%, ordinary PF weight loss of 16.34% and 74.31%, tung oil modified PF thermal stability has been greatly improved. FIIR analysis indicated that tung oil became part of the polymer structure. The mechanical test results show that the tung oil modification greatly improved the toughness of PF. When the addition amount of tung oil was 14% and the molar ratio of phenol/formaldehyde was 1:1.2, the impact strength reached 11.31kJ/m2. 35.5%, the flexural strength reached 25.4MPa, an increase of 53%.

Radio frequency plasma enhanced chemical vapor deposition (RF-PECVD) assisted hot wire chemical weather deposition (HF-CVD), ie RF-HFCVD, with CH4, H2, Ar as the gas source, on the AF1 tungsten steel razor blade, A nano-scale diamond film is deposited. The effects of deposition pressure and CH4/H2 flow ratio on the deposition of the film were investigated. The morphology and composition of the film were analyzed by scanning electron microscopy (SEM) and Raman spectroscopy. The film-based adhesion was tested by Rockwell hardness tester. . The results show that the change of deposition pressure and CH4/H2 flow ratio has a great influence on the surface condition of diamond film. The content of sp3 in the film increases first and then decreases, and reaches the maximum at 700Pa, 5.5% hydrocarbon ratio. value. The indentation test found that the film had micro-cracks and the film-based bonding strength was good.

The report is divided into three parts, which introduces the history of PDC development, the status of domestic PDC and the technical direction of PDC products. In the introduction of the history of PDC development, the foreign mainstream manufacturers were the American EG Super Abrasives Department and the South African EeBeers Company. They all used the annual two-sided top press to produce PDC; the Chinese PDC development was firstly carried out by Zhengzhou Abrasives. In 1986, the Institute of Grinding applied for the project in the Science and Technology Department of the Machinery Committee. In 1987, it completed the “Research on High Grade Polycrystalline Diamond-Carbide Composites”. In 1988, it took the pilot test and achieved results in small batches. The first promotion in the country. The report also describes the size specifications, product performance, and overall level of domestic PDCs; and the direction of PDC product technology, including PDC manufacturing technology, new binders and even binderless PDCs and some new detection methods for oil PDCs. .

The report systematically studied the PCBN synthesis-tool preparation-cutting experiment and discussed the relationship between the PCBN tool synthesis process and the binder formulation and tool wear. The PCBN was prepared by pure metal bond, pure ceramic bond and metal-ceramic bond. The titanium alloy TC4 was cut. The results show that the metal bond PCBN insert has the best performance and the best surface quality. . The tool is mainly worn on the flank and the front face is less worn.

The results show that the vulcanization characteristics, physical properties and bonding force of the diamond wire saw rubber bonded rubber at different vulcanization temperatures are tested. The results show that increasing the vulcanization temperature can shorten the vulcanization time and improve the production efficiency; the physical and mechanical properties of the vulcanization temperature on the rubber compound No significant effect, the performance is basically equivalent in the equivalent curing time, the performance is only slightly reduced at 165 ° C, but the stabilization time is shortened.
In the diamond tool making process, a large amount of testing is required for the ratio of the raw materials and the finished product. X-ray fluorescence spectrometry is an important method in modern routine analysis, with fast and accurate characteristics. The report elaborates on the definition and generation mechanism of X-ray, the mechanism of X-ray fluorescence spectroscopy and qualitative and quantitative analysis methods, and focuses on the application of X-ray fluorescence spectroscopy in the process of diamond tool fabrication, which is efficient for diamond tools. And stable cutting provides reliable quality assurance.

The report explains the importance of deep hole drilling for economic development and the characteristics of China's mineral resources. From the aspects of deep hole drilling complexity, drill bit characteristics, ultrafine powder application, etc., the problems that should be paid attention to in the development of deep hole drill bits are elaborated. The production method of deep hole drill bit and several drill bits applied to deep hole drill indicate that deep hole drill bit and deep hole drilling technology should be actively developed.

The report mainly introduces the influence of multi-particle size mixed-type homogenous Fe powder on the performance of the carcass for the pressureless sintered diamond circular saw blade. Through the Rockwell hardness, bending strength, post-sinter SEM microstructure analysis and trial cutting, the following conclusions are drawn: in the same formula system, when the elemental Fe powder content accounts for 50%~60 of the total content in the carcass formula When % is used, the multi-particle size mixed-type homogenous Fe powder can improve the hardness and bending strength of the carcass, and the sharpness and life of the saw blade are also improved.

The biggest drawback in laser welding is the easy generation of pores. It is reported that the weld strength and appearance quality of laser welding can be optimized by studying the design of the transition layer to improve the sintering temperature and reduce the generation of pores. It is concluded through experiments that proper addition of Mn in the transition layer of the laser welding gas cutter head is beneficial to reduce the generation of pores, effectively reduce the sintering temperature, and avoid damage to the working layer diamond by excessively high sintering temperature.

The report tested the carbonyl iron powder of two foreign companies and three domestic companies. By comparing the particle size distribution, the suppression of scrap rate and the cutting performance, it was shown that when the particle size distribution of carbonyl iron powder was controlled within a certain range, good press formability and Use performance.

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