The 19th China Superhard Materials Technology Development Forum (2)

The process of real-time online monitoring of important quality data of diamond wire saw in the production process through two-dimensional image is introduced. This monitoring system can be used to accurately monitor diamond wire saws with wire speeds up to 60 meters per minute. The data automatically calculated by the monitoring system provides real-time feedback to the diamond wire saw production line. Monitor statistics and charts to more fully describe the quality of diamond wire saws. Especially in the development and production process of diamond wire saw, the system can reflect the powerful ability.

Based on domestic equipment and raw materials, we have developed a new high-performance polycrystalline diamond composite chip bit for complex formations. The experimental data show that the wear resistance of this new high-performance polycrystalline diamond composite sheet is higher than that of the conventional products of the market, which is 48.56%, and the impact performance is higher than the conventional product of the market by 47.22%. The field drilling data shows that the drilling depth and drilling rate of the new product in the field are significantly higher than the conventional products in the market, and it is not easy to be disintegrated and peeled off. It can be effectively applied to deep hard formations and complex formations.


A polycrystalline diamond composite sheet with a diameter of 58 mm was synthesized by using a domestic six-face press. Ultrasonic micro-imaging analysis showed that the sample had no defects such as delamination, cracks, and uneven thickness of the diamond layer. Conductivity and cutting tests showed that the experimentally synthesized 58 mm diameter composite sheet exhibited excellent wear resistance and excellent cutting speed.

Under the guidance of bionic efficient wear-resistant theory, this study uses the Mole claw toe as a biomimetic prototype to introduce its high-efficiency wear resistance after long-term evolution. The CVD polycrystalline diamond is used as the cutting unit of the cutting teeth, and the bionic high-efficiency cutting teeth are prepared by the vacuum hot pressing sintering process. The comparison test results show that the wear resistance of bionic high-efficiency cutting teeth is 23% higher than that of conventional PDC teeth, the cutting efficiency is 1.49 times higher than that of conventional PDC teeth, and 48% higher than that of biomimetic PDC teeth. It proves the feasibility of the bionic high-efficiency cutting process and method, and lays a solid foundation for the next step of high-efficiency cutting bit.

Experimental study on grinding sapphire wafers with W7 boron carbide grinding fluid equipped with cast iron disc and ceramic composite disc, W7 diamond grinding liquid with resin copper disc and polyurethane synthetic cloth, comparing cast iron disc, ceramic composite disc, resin copper disc, polyurethane polishing cloth Roughness and grinding efficiency of coarsely ground sapphire wafers. The test results show that the ceramic composite disc is superior to the cast iron disc in roughness and grinding efficiency, and the roughness and grinding efficiency of the polyurethane synthetic fabric are superior to those of the resin copper disc.

Taking the internal grinding of the cylinder head of the air-conditioner compressor in actual production as the research object, the ceramic bond CBN grinding wheel was used to carry out the trimming process test research. The surface roughness of the workpiece was analyzed by surface roughness meter. The roundness and cylindricity of the inner circle of the workpiece were analyzed by the roundness cylindrical shape measuring instrument. The actual number of the grinding wheel was obtained by counting the number of workpieces processed by each grinding wheel. life. The results show that the excessively long dressing interval will greatly increase the wear loss of the grinding wheel during the grinding process, so the excessively long dressing interval will reduce the service life of the grinding wheel. It is reasonable to use the dressing interval of less than 100 pieces in the inner circle of the grinding air-conditioner cylinder cylinder. Under the premise of satisfying the quality of the workpiece, the trimming interval can be appropriately increased, but the maximum value should not exceed 100 pieces.

Aiming at the economical requirements of cutting materials such as precious stones, a new type of diamond wire saw with an outer diameter of only 2.0-3.0 mm was developed and manufactured. The wire saw is subjected to a marble cutting test to determine the sawing parameters and performance analysis. The results show that the wire saw has good cutting sharpness and is not easy to break the rope. The cutting speed is compared with the existing diamond wire saw with an outer diameter of 8.8 mm, due to the slitting. Small, stone cutting rate can be increased by 20-30%, and cutting power consumption is small, waste residue emission is small, energy saving and environmental protection.

Diamond cutting tools are mainly used to process brittle and hard materials such as stone, concrete and ceramics. Diamond is the main working point. The edge and wear state of the diamond during the cutting process has an important influence on the main performance of the tool, namely cutting efficiency and service life. The research status and progress of diamond cutting edge and wear state in diamond cutting tools are reviewed. Through analysis, it is found that although a lot of research has been done on the diamond blade and the wear state, it is not sufficient from the research method or the research results, and further research is needed.

The mechanical properties of the two kinds of sintering processes in terms of density, hardness, impact strength and flexural strength were studied by using hot isostatic pressing and traditional hot pressing of Co powder. The experimental results show that the hot isostatic pressing sintering has a significant improvement in relative density, impact strength and flexural strength compared with conventional hot-pressed sintering. The hardness of sintered products by hot isostatic pressing Slightly lower than conventional hot press sintering. In field applications, diamond wire saw products prepared by hot isostatic pressing have been well received by customers.

By analyzing the current status of diamond tools in brazing, the technical problems and solutions of brazed diamond tools are pointed out, that is, the wear resistance of brazing alloys is improved. The compactness and metallurgy are the most improved performance of brazed diamond tools. Good method.

Chemical analysis refers to the qualitative, quantitative and structural analysis of complex mixtures. It is characterized by the combination of multiple separation and analysis methods, which is “comprehensive analysis”. This comprehensive analysis is the most exploratory in analytical science. And challenging subjects. At present, with the popularization of various large-scale advanced instruments, chemical analysis technology is rapidly developing and applied to various industries. Based on the characteristics of the manufacturing process of metal bond abrasives, based on conventional chemical analysis, combined with atomic emission spectroscopy, scanning electron microscopy, energy spectrum and X-ray diffractometer analysis, a complete set of chemical analysis methods for metal abrasives is summarized. To provide services and reference for product development and quality control for industry technicians.

The copper-coated iron powder was chemically treated to obtain a mixed sample of copper and iron powder, and then subjected to relevant tests using an X-ray fluorescence meter. It was found that the measured copper-clad iron powder was reduced by 75% compared with the untreated test result, which solved the problem of inaccurate measurement.
Different types of auxiliary abrasives were added to the fixed background formula, and the ratio was adjusted to prepare experimental splines. After appropriate heat treatment, the properties are characterized by parameters such as impact strength, sharpness, and abrasion resistance. The experimental results show that green silicon carbide can improve the sharpness of the spline, and the white corundum has excellent performance in wear resistance, and the addition of an appropriate amount of alumina micropowder can improve its mechanical properties. The desired effect can be obtained by adjusting the ratio between the auxiliary abrasives.


The bonding agent used in superhard material products usually needs to be sintered or solidified in a high temperature environment. Synchronous thermal analysis is an analytical technique for measuring the relationship between physical properties and temperature of a substance, and can change, decompose and solidify the substance during heating. And quality changes, etc., to provide a reliable guidance for the manufacture and research of superhard materials. Therefore, the application of simultaneous thermal analysis in superhard materials is very important. Screening application examples introduce the application of synchronous thermal analysis in superhard materials, and introduce the application direction of synchronous thermal analysis in superhard products through the manufacturing characteristics of superhard products.

Note:
The spokesperson of the seminar has a representative, and there are certain discrepancies between the original author of the academic report and the photos of the site; the "The 19th China Superhard Materials Technology Development Forum Proceedings" edited by the Superhard Materials Branch of China Machine Tool Industry Association is the final standard.

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