Up chamfer, down chamfer and working face must be correctly dressed so that the valve seat can acquire a longer service life.
Nowadays, there are mainly two types of tool for fixing valve seat in China: one is the valve seat reamer, which has two kinds of constructions——the solide HSS steel one and the weld hard alloy one, used to ream up chamfer, down chamfer and working face. The other is the
grinding wheel, used to dress the valve seat accurately. In this paper, a kind of coarse grain
electroplated diamond grinding wheel is proposed, which can overcome the deficiency of reamer by grinding in place of reaming. The experiment result indicates that a valve seat can acquire smaller roughness value, reduced dressing quantity and higher surface hardness by using the above mentioned grinding wheel to dress it, and at the same time satisfy the fixing need. The experiment proved that this kind of grinding wheel is prior to the solide HSS steel reamer and the weld hard alloy one as to the aspects of performance, accuracy and economical value.