Development history of CBN grinding technology for automotive camshaft

More Superhard Material Co., Ltd.

CBN grinding wheel grinding has the significant advantages of high efficiency, high precision and low cost, which is an inevitable trend in the development of camshaft grinding technology. Based on the results of many years of experimental research and related technical literature, the article points out the main constraints in the process of bringing the CBN grinding technology of camshafts to the market in China, and puts forward positive suggestions for the widespread use in camshaft machining. CBN grinding technology improves the overall processing technology of the engine.

As one of the key parts of the engine, the camshaft directly affects the dynamic characteristics of the engine. At the same time, the camshaft is a non-circular grinding workpiece with large machining allowance and difficult material grinding. Cutting precision and production efficiency requirements are high, and processing is relatively difficult. Therefore, the grinding technology of camshafts has always been the focus of attention in the industry. How to improve the grinding efficiency and processing quality is an urgent problem to be solved in camshaft grinding.

The following factors should be considered:

characteristics of thecamshaftmachine;

The way the cam profile is ground and formed;

Grinding wheel performance and coolant;

Grinding process, including dressing tools and finishing processes.

Suitablegrindingmaterials of cbncamshaft grinding wheel:

Cast iron: cold-excited cast iron, ball-milled cast iron, grey cast iron, alloy cast iron, etc.

Steel parts: 20Cr, GCr15, CF53, 45 steel, 55 steel, 80B high carbon steel

1. The maximum use speed can reach 160m/s

2. High standard factory precision control

3. The main grinding performance has reached the level of imported similar products.

4. Can make all kinds of grinding wheel base

It is mainly used to grind various crankshafts and camshafts of automobiles, tractors and transport aircraft engines.

Grinding camshaft grinding wheel: used in Germany, Japan, the United States and domestic grinding camshaft machine tools, grinding wheel specifications Ф200～Ф500mm, grinding wheel using linear speed 40～125m/s, single-piece grinding wheel processing 8000～4000 shaft. The processing cost of a single part is 30-50% lower than that of an imported grinding wheel.

Crankshaft grinding wheel: It is used for grinding crankshaft machine tools in Germany, USA, Japan and China. The grinding wheel specifications are Ф400～Ф700mm, the grinding wheel uses linear speed of 40～150m/s, and the single-piece grinding wheel processes 8000～30,000 axes. The processing cost of a single part is 30-50% lower than that of an imported grinding wheel.