1. Grinding automotive parts - camshaft and crankshaft

The camshaft of automobile engine has a number of cams. The coarse grinding and fine grinding of the cam after hardening is the key process which affects the cam quality. Usually by the use of simulation-shaped grinding, the workpiece speed limit is limited, the workpiece is easy to produce grinding burns crack, the use of analog-shaped grinding, the cam surface contour curve wheel diameter affected by the size, it is difficult Make sure the cam profile is correct. Production practice shows that when the wheel diameter is large, the grinding out of the cam thin, when the wheel diameter is small, grinding the cam fat, only when the grinding wheel diameter close to or equal to the cam roller diameter (usually φ570mm) The profile error is close to zero, that is, the grinding cam surface contour curve close to the cam cam. In actual production, the wheel diameter used is generally from D600 (or 610) to D500, and the ideal wheel diameter (570) a lot of difference, so the total camshaft in most of the cam curve exceeded. To solve this problem, we rely on the grinding cam on the use of CBN grinding wheel grinding, CBN wheel diameter can be made D575, CBN abrasive layer thickness of 4 ~ 5mm, the grinding wheel diameter is the minimum D565, grinding diameter Although the scope of only 10mm, but the number of grinding parts is equivalent to dozens of ordinary wheel, not only to ensure the correct cam curve, but also does not produce grinding burns.

Such as Liton industrial automation company with CBN wheel grinding camshaft, the cost is reduced by 50%, the cam surface fatigue strength increased by 30%; Dongfeng Motor Company Xiangfan diesel engine plant with ceramic bonding agent CBN grinding wheel coarse grinding chilled cast iron camshaft , The cam grinding margin t = 4 ~ 5mm, υ sand = 60m / s, the workpiece speed n = 100r / min, υf = 0.1mm / s, using high-speed grinding fluid, CBN grinding wheel life is basically equivalent to 20 Corundum abrasive wheel.