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我厂生产小型汽油机和柴油机,大部分是铸铝件。由于汽油机曲轴箱体螺孔较多,向来用机攻丝锥攻螺纹,加工过程容易发生烂牙。一个曲轴箱的35个螺孔中有一个烂牙则整件报废。为提高产品质量降低废品率,从80年四月份开始进行无槽丝锥攻丝新工艺的试验研究工作,至七月份,已将此新工艺用到曲轴箱加工工艺中。现将情况介绍如下。一、无槽丝锥的试验研究无槽丝锥攻丝工艺是利用冷挤压原理使材料达到塑性变形后产生螺纹,实际上是一
I plant a small gasoline engine and diesel engine, most of the cast aluminum pieces. As the gasoline engine crankcase screw holes are more tapping machine tap has always been taping process prone to rotten teeth. One of the 35 screw holes in a crankcase is scrapped. In order to improve the quality of the products and reduce the rejection rate, from April 80, the trial work on the new technology of tapless tap tapping was started. Until July, the new process was applied to the crankcase processing. Now the situation is as follows. First, the experimental study of slotless tap Tap without taper tapping technology is the use of cold extrusion principle to achieve plastic deformation of the material after the thread, in fact, is a