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一、问题的提出攻丝是加工螺母的最终工序。长期以来,标准紧固件的生产工艺都是单一的金属切削,成本高,产量低,单件操作,而且质量也不稳定。随着生产技术的不断发展,紧固件的生产已逐步向少切削和无切削的冷镦工艺方面过渡。由于切削与冷镦的工艺不同,对成品的要求和材质也因之而异。冷镦螺母的材质一般是低螺钢(DL)和铆螺钢(ML),其塑性较切削用的普通碳素钢和优碳钢为好,伸长率δ_(?)。可达26％以上,是专门生产螺母的新钢种。但由于选用新钢种,原来攻丝用的丝锥(按国家标准规定的几何角度)就不能适应新的切削要求。主要表现在成品质量不稳定,丝锥使用寿命
First, the question raised Tapping is the final process of processing nuts. For a long time, the standard fastener production process is a single metal cutting, high cost, low output, single operation, but also the quality is not stable. With the continuous development of production technology, the production of fasteners has been gradually shifted to less cutting and non-cutting cold heading process. Due to the cutting and cold heading process is different, the requirements and materials of finished products also vary. The material of cold heading nuts is generally low screw (DL) and riveted screw (ML), the plasticity is better than ordinary carbon steel and carbon steel for cutting, the elongation δ_ (?). Up to 26%, is a new type of steel specializing in the production of nuts. However, due to the selection of new steel, the original tapping tap (according to the national standard geometric angle) can not adapt to the new cutting requirements. Mainly in the finished product quality is unstable, tap life