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目前国内外建筑五金、家电等行业越来越多地采用自攻螺钉、墙板螺钉等新型紧固件。这些紧固件的的螺纹加工多采用无切削搓丝成型工艺。使用材料一般是φ6.35～φ8mm的低碳钢线材。钢丝在多次冷拔后经过一次中间退火,再精拔一次,然后冷镦,搓丝成型。中间退火工艺是冷镦、搓丝变形的关键。若退火工艺不当,不仅不能充分发挥材料塑性,反而会给冷变形成形带来困难。现结合我厂实践作以下分析。
At present, more and more domestic and foreign construction hardware, home appliances and other industries using self-tapping screws, wall screws and other new fasteners. The use of these threadless fasteners thread rolling molding process. The use of materials is generally φ6.35 ~ φ8mm mild steel wire. After many cold-drawn steel wire through an intermediate annealing, and then refined once, and then cold heading, Roll silk forming. Intermediate annealing process is upsetting, twist silk deformation key. If the annealing process is not properly, not only can not give full play to the material plasticity, but will bring difficulties to cold deformation forming. Now combined with my factory practice for the following analysis.