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图1所示的传动转臂,是我厂飞虎牌小汽车变速箱上的一个传动件。采用厚板料变薄翻口,翻边后高度H=7.5。要求塌角R<2,零件材料为20号冷轧钢板,厚4毫米。其工艺关键是如何达到翻口要求。我们经过反复试验,终于采用冲压和冷挤压相结合的方法,达到了零件的设计要求。工艺过程 1.下料:条料350×114×4毫米; 2.软化处理:800～850℃,保温3～4小时,处理后要求HB=120～130; 3.酸洗,除氧化皮;
The transmission arm shown in Figure 1 is a transmission part on the transmission of the Tiger car in our factory. Using thick sheet thinning mouth, flanging height H = 7.5. Require the collapse angle R <2, the part material is No. 20 cold-rolled steel, thickness 4 mm. The key is how to achieve the process of claiming. After repeated tests, we finally adopted the combination of stamping and cold extrusion to achieve the design requirements of the parts. Process 1. Blanking: strip 350 × 114 × 4 mm; 2. Softening: 800 ~ 850 ℃, heat 3 to 4 hours after treatment requires HB = 120 ~ 130; 3. Pickling, in addition to the scale;