螺套座是内燃机车上的零件,每台车需用量很多,锻件基本是黑皮,要求每个角要直而平整(见图1)。试锻时采用的工艺是:将坯料锻成70×85×152mm的长方块一冲φ28×85mm的孔一劈28mm的槽一用芯料夹住平整。这种方法的缺点是:冲φ28×85mm的孔困难,冲头易损,劈剁槽时更难,即使剁掉,锻件也变形;需3～4火次才能锻成,费料费力,生产效率低。后来采用了弯曲工艺:用型板压成图2所示带两圆形凸起的方块一剁头一弯曲一垫芯铁平整。此工艺的特 Spiral seat is a diesel locomotive parts, each car need a lot of usage, forging is basically black, requiring each corner to be straight and smooth (see Figure 1). Forging process is used: the billet forged into a piece of 70 × 85 × 152mm a hole φ28 × 85mm a split 28mm slot with a core material to clamp formation. The shortcomings of this method are: punching holes of φ28 × 85mm is difficult, the punch is fragile, the chopping groove is more difficult, even chop off, the forging is also deformed; need 3 ~ 4 fire times to forge, laborious and difficult to produce low efficiency. Later, the use of the bending process: with the plate pressed into the square with two round protrusions shown in Figure 2 a chop head a curved core pad formation. This craft special