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攻丝工序在切削加工中占有很大的比重,它基本上可分机械攻丝和手工攻丝两种。由于攻丝首先要求有定心性,即要求攻丝时丝锥中心线对准螺纹底孔中心线:其次要求有补偿性,即要求当丝锥螺距与螺孔螺距不符时能自动补偿不乱扣,因而机械攻丝采用带有攻丝靠模装置的组合式专用攻丝机较多,采用摇臂式通用攻丝机的较少。但专用攻丝机制造成本高,攻丝范围小,所以一些中小型农机修造厂大多不采用它,而是以手工通用攻丝机为主。如黑龙江省农机局所属的五家年产千件以上拖拉机壳体的工厂,就有四
Tapping process in the cutting process occupies a large proportion, which basically can be divided into two kinds of mechanical tapping and manual tapping. As the tapping first requires a concentricity, that is required tapping the center line of the thread tapping thread bottom hole centerline: followed by the requirements of compensatory, that is required when the tap pitch and screw hole pitch does not match automatically compensate when the chaos buckle, and therefore Mechanical tapping using tapping mode with a combination of more dedicated tapping machine, using less universal tapping machine arm. However, the special high-cost tapping machine manufacturing, tapping a small range, so most small and medium-sized farm machinery repair shop do not use it, but the general manual tapping machine. For example, five factories belonging to Heilongjiang Agricultural Machinery Bureau each have an annual output of more than 1,000 tractor housings,