Table 6 Needle valve body grinding processing effect
Another example is the use of ceramic bond CBN grinding wheel for rough grinding of automotive cold-excited cast iron camshaft (grinding wheel diameter 600mm, speed of use 65m / s), compared with corundum grinding wheel, durability increased by more than 100 times, life expectancy increased by 40 times; grinding wheel and trimming The direct cost of the tool is reduced by 15%, the production efficiency is increased by 10%, the auxiliary working hours are reduced, the labor intensity is reduced, and the processing quality is improved.
(2) CBN cutter
The biggest feature of CBN tools is the ability to turn hardened steel parts with a hardness greater than 45HRC. Because CBN does not produce affinity with iron-based metals, it can be used for cutting of bearing steel (60-62HRC), tool steel (57-60HRC), high-speed steel (>62HRC), etc. Processing efficiency. Another characteristic of CBN cutters is their high temperature resistance. The hardness at 1000 °C is comparable to that of cemented carbide at room temperature, and other properties are also very stable. Here are a few examples of CBN tool turning operations.
1 processing pump spoke plate material is Cr15MoV2, hardness 60 ~ 62.5HRC, workpiece diameter 910 ~ 1020mm, center ring 300 / 370mm, each CBN turning tool can process 2 ~ 3 webs, and with carbide cars For knife processing, three blades are required for one web. The service life of CBN turning tools is about 10 times that of cemented carbide turning tools.
2 Processing steelmaking furnace feed hopper shell sealing section workpiece diameter is 1000 ~ 1200mm, material is G50Mn2, hardness > 55HRC, the original YS2T carbide turning tool processing takes 1 ~ 1.5 hours, using CBN turning tool processing only It takes 7-8 minutes to complete, greatly improving work efficiency, and the surface roughness of the processing reaches Ra1.6μm.
3 Processing roll A factory rebuilds the old plate roll, the roll size is 300×3400mm, the surface hardness is 47～50HRC, the machining allowance is 7mm, the weight of one piece is 2 tons, and a total of 6 pieces need to be processed. Originally planned to be processed with carbide turning tools, but it must be transported to the outside factory for tempering before turning, and the cost of round-trip handling is very high. The CBN turning tool can realize the in-situ processing in the factory, and a CBN turning tool can process one roll, which saves time and labor and saves a lot of expenses.
Fourth, the conclusion
The research and production of superhard materials in China is developing rapidly, and the application of superhard materials in mechanical processing has also achieved good results, and the application prospect is very broad. The main problem currently exists is that product quality needs to be improved, and the promotion and application work is not enough. In the future, on the one hand, we should increase the promotion and application of super-hard materials; on the other hand, we must strengthen research and development, improve the quality of super-hard materials, increase the types of products, strengthen after-sales service, and narrow the gap with developed countries as soon as possible. Play an important role in the machining of superhard materials.
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