矿山机械制造或修造厂生产特点是单件小批生产,即产品种类多,同样尺寸的零件少,零件内孔的单键或第34卷2006年第10期多键(花键)若在拉床拉削加工,需要多种规格的键槽或在键拉刀。拉刀价格昂贵,工序的加工成本将极大的提高,不经济。所以矿山机械厂在单件小批生产时对零件内孔单 Mine machinery manufacturing or repair plant production is characterized by a single small batch production, that is, the product range, the same size of the small parts, the hole in the single-button or Volume 34 2006 10 10 If the key Broaching bed, you need a variety of keyway or key broach. Broach price is expensive, the process of processing costs will be greatly improved, not economical. Therefore, mining machinery factory in a single small batch production of parts within a single hole