Ceramic Bond Diamond Wheel for Processing PCD cutters

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Ceramic Bond Diamond Wheel for Processing PCD cutters

:yinglong :2018-11-29 15:10:01

Ceramic Bond Diamond wheel with ceramic bonding agent and diamond common features, compared with ordinary abrasive; their grinding ability, low grinding temperature, abrasive durability; grinding shape maintenance of the abrasive Good, the parts machined out of high precision; abrasive self-sharpening good, long dressing intervals, trimming is also relatively easy; grinding is not easy to block, easy to burn the work-piece, and can be cooled with a variety of coolant. Therefore, the use of ceramic bonded diamond abrasive in some developed countries is increasing day by day, while our country is still in the laboratory stage or trial stage.

Special grinding wheel for PCD tool

Ceramic bond diamond wheel is mainly used in the grinding and processing of diamond cutting tools, cubic boron nitride cutting tools, cemented carbide, cermets, ferrites, cast iron, precious stones, ordinary ceramics and new engineering ceramic materials, but also for chromium Quench steel bearing rollers, crankshafts for tractors and tractors, gear necks for hydraulic pumps, and other precision grinding.

Research and development of high strength, low temperature, low expansion coefficient of ceramic bonding agent, is the focus of the current domestic and foreign super-hard materials ceramic abrasive research. Diamond thermal stability is not high, heated to above 700 ℃ in air, that is, oxidation or graphitization, the quality is reduced, the surface structure began to change, the intensity decreased. In the non-oxidizing medium, at 1600 ~ 1800 ℃, all of the graphitization. The developed binder has a refractory resistance of only 760 ° C, its firing temperature is much lower than 1000 ° C, and there is almost no change in the diamond performance during the sintering process.

PCD is a diamond powder and cemented carbide substrate by high temperature and pressure sintering of composite materials, the wear rate than the general reached 13 to 400000, are extremely difficult to process the product. Ceramic bonded diamond wheels have the following five advantages over PCD wheels when processing PCD:

① grinding efficiency of diamond ceramic wheel is more than 3 times the resin wheel;

② wheel in the entire grinding process, in addition to grinding the surface of the wheel outside, no longer need to trim. Resin wheel must be trimmed 7 to 12 times, or grinding can not move the work-piece;

③ PCD grinding out is also quite different in shape. The PCD side of the resin grinding wheel is projected into an isosceles trapezoid, one end of the diamond layer is far larger than the other end of the substrate, and the PCD side processed by the ceramic grinding wheel is projected into a square shape, 2 end face the same size, this point is measured at a glance with a square. Especially PCD "running material", the resin wheel almost can not be amended, ceramic wheel will not happen. This is mainly because the resin wheel has a certain elasticity, will give a certain concession in the grinding process, and the ceramic wheel due to the overall elastic modulus, good rigidity, high temperature, grinding will not produce a knife phenomenon;

④ work-piece finish better than resin wheel. Because the resin material in the resin wheel is not heat-resistant, it softens easily at 200 ° C, resulting in greater brittleness, causing the wheel to collapse. Therefore, more copper powder is often added to the wheel to dissipate the heat, Sex, easy to stick around the PCD, making the processed products are not bright. The ceramic grinding wheel processed products can reach almost the extent of the mirror, is expected to crude, finishing a process is completed;

⑤ can use a large amount of feed. Resin grinding wheel If you use a large amount of feed, or grinding wheel does not move the work-piece, or grinding wheel collapse block.

In short, the grinding of PCD grinding wheel, its grinding efficiency, grinding fewer trimming time, the work-piece size machining accuracy, high finish, PCD is the most suitable choice for grinding. However, the existing problem is that the manufacturing cost of the ceramic wheel is higher than that of the resin wheel. Therefore, the durability of the wheel must be further increased so as to enlarge the cost performance advantage of the ceramic wheel when grinding the PCD material.

TAG: Ceramic Bond Diamond wheel