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在内螺纹加工中,人们多采用成套手用丝锥,加工大尺寸螺纹则劳动强度大、生产效率低;加工小尺寸螺纹,由于丝锥强度低,常发生丝锥扭断。若采用钻床加工,由于力矩大小难以控制,丝锥也容易发生扭断。 我厂有一零件,材料为30CrNi2MoVA热处理后硬度为37～42HRC,要求在该零件上加工M6的内螺纹。由于该材料的韧性特好,同时硬度又高,多次尝试采用手工及钻床攻丝,稍有不慎,即发生丝锥扭断,情况很是棘手。 我们依据丝锥工作的特点,分析了各种加工方法丝锥扭断的原因,对现有丝锥稍加改制在钻床上实现
In the internal thread processing, people use more sets of hand taps, processing large-size thread is labor-intensive, low productivity; processing small-size thread, because the tap strength is low, often occur Taps twisting. If the use of drilling, due to difficult to control the size of the torque, taps are also prone to twist. I plant a part, the material is 30CrNi2MoVA hardness after heat treatment of 37 ~ 42HRC, M6 in the processing of the parts on the internal thread. Due to the toughness of the material is particularly good, at the same time the hardness is high, many attempts to use manual and drilling tapping, a little careless, that is, the occurrence of taps twist, the situation is very tricky. Based on the characteristics of tap work, we analyzed the reasons for the tap breakage of various processing methods, and made some modifications to the existing tap on the drilling machine