我厂是加工汽车变速箱壳专业厂，在加工一种变速箱壳时，其前端面上二轴孔端面有一油封密封凹槽，如图１所示。过去，在卧式镗床上镗孔时一并刮槽，但由于机床难于控制与调整，造成凹槽有深有浅，难达到图样要求。又因槽太窄（仅３．２ｍｍ宽），刀头刚性不足，经常损坏刀具。 Our factory is specialized in manufacturing automobile transmission shell. When machining a transmission case, the front end face of the two-axis hole has an oil seal sealing groove, as shown in Figure 1. In the past, horizontal boring machine while boring slot, but because of the machine control and adjustment is difficult, resulting in deep groove shallow, difficult to meet the design requirements. Because the groove is too narrow (only 3.2mm wide), lack of rigidity, often damage the tool.