Camshaft grinding with vitrified bonded CBN grinding wheels
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Grinding wheel specifications for camshaft grinding
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Material to be ground |
Specification (finishing) |
Specification (roughing) |
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Hardened steel |
3B91 O15VP600125/KE |
Mostly electroplated CBN wheels |
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Chilled cast iron |
3B91 P15VP600125/KE |
3B91 P4DV600C100 | | |
Grinding wheel dimensions:
· For standard cam shapes: Type 1A1 Æ 250 to 400 mm
· For negative cam shapes (finish grinding): Type 1A1 Æ 80 to 125 mm
Peripheral speeds:
80 to 140 m/s
(16,000 - 28,000 sfpm)
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In order to improve the performance of car engines and, at the same time, to reduce the emission of pollutants, the valve acceleration has to be increased. This requires a concave cam shape, or negative cams, which can only be ground with small diameter grinding wheels between Æ 40 and Æ 60 mm. Rough grinding is generally done with large diameter electroplated wheels and the final finishing operation is afterwards performed with small diameter vitrified CBN wheels.
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