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我厂研制并经长期成批生产的某发动机,其曲轴后部是发动机的关键零件之一,该零件的盲孔螺纹M18×1.5毫米的要求见图1所示: 此零件材料为45Mn,是一种弹簧钢,最后热处理为淬火和回火,其强度高,淬透性较大,脱碳倾向性小,但有过热敏感性,易出现淬火裂纹,并有回火脆性,硬度HB=250～302。我厂自生产该发动机以来,加工曲轴后部的盲孔螺纹一直采用钳工——手工攻丝的方
I plant development and long-term mass production of an engine, the crankshaft rear is one of the key components of the engine, the parts of the blind hole thread M18 × 1.5 mm requirements shown in Figure 1: This part of the material is 45Mn, is A spring steel, the final heat treatment for quenching and tempering, high strength, hardenability, decarburization tendency, but overheating sensitivity, prone to quenching cracks, and temper brittleness, hardness HB = 250 ~ 302. I plant since the production of the engine, the processing of the blind hole at the rear of the crankshaft has been using fitter - manual tapping side