从意大利进口的T20汽车变速箱中,有不少零件是模锻件。我厂因无模锻设备,多年来一直采用胎模锻造,积累了一些经验。现将部分零件的锻造工艺介绍如下: 一、锻造工艺 1.拐臂轴(锻件见图1) 拐臂轴零件的关键在于制坯,经过试验,选用φ28×130毫米的料,按图2进行弯曲制坯,然后放入锻模成型。φ20×10毫米的小端头在锻模中挤压成型(锻模见图3)。 2.球头(锻件见图4) 此零件φ20毫米圆柱与φ28毫米圆柱相贯处圆弧过渡要求光滑。要确保锻件的质量,关键是 T20 imported from Italy car gearbox, there are many parts is die forgings. I have no plant forging equipment, for many years has been using forging die, has accumulated some experience. Now part of the forging process are as follows: A forging process 1. Crank shaft (forgings see Figure 1) Crank shaft parts is the key to the blank, after testing, the choice of φ28 × 130 mm material, according to Figure 2 Bending blank, and then into the forging molding. φ20 × 10 mm tip in the forging die extrusion (Forging die see Figure 3). 2 ball (forgings see Figure 4) φ20 mm cylindrical parts and φ28 millimeters cylindrical arc at the intersection of smooth transition. To ensure the quality of forgings, the key is