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耐热合金的紧固件,由切削加工改为冷镦,使生产效率提高一倍以上,材料利用率由24％提高到76％,尤其是显著地改善了零件的质量。其强度极限提高10％,疲劳强度可提高三倍左右,较好地解决了螺栓掉头或折断的问题。现根据我们的生产实践,谈谈耐热合金冷镦工艺中存在的问题,以及采取的相应措施。一、存在的主要问题 1.模具破裂由于耐热合金有Si、Cr、Mo、W、Mn等元素,因此,冷态变形时快速强化,使其塑性降低,屈服极限和强度极限提高,一般σ_b>70
Heat-resistant alloy fasteners, from cutting to cold heading, the production efficiency more than doubled, the material utilization increased from 24% to 76%, in particular, significantly improved the quality of the parts. Its strength limit increased by 10%, fatigue strength can be increased about three times, a better solution to the problem of the bolt U-turn or broken. Now according to our production practice, talk about the heat-resistant alloy cold heading process of the problems and the corresponding measures taken. First, there are the main problems 1. Mold rupture As the heat-resistant alloy with Si, Cr, Mo, W, Mn and other elements, so cold deformation quickly strengthened so that its plasticity decreases, yield limit and strength limit increased, the general σ_b > 70