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我厂在使用某钢厂一批φ22GCr15钢,生产冷挤压202-01轴承套圈时,在锻工镦粗工序加工后发现约30％左右的材料在镦粗后开裂。当时认为压缩比过大造成的开裂。本来冷挤202-01套圈按工艺图纸要求是用φ24钢材,但一时无这挡规格,用φ22代用。通过计算压缩比没有超过,还在范围之内,因此我们仔细分析了开裂情况。发现这批开裂材料中有三种不同的开裂。(1)工件的开裂是一种细直裂,裂纹没有向里延伸,而是有规律直裂;(2)工件的裂纹是开口大裂,裂纹呈V形,并向里延伸;(3)工件是有规律
I use a factory in a steel plant a group of φ22GCr15 steel, cold extrusion production of 202-01 bearing rings, the forging upsetting process found about 30% of the material after upsetting cracking. Was that the compression ratio caused by the cracking. Originally cold extrusion 202-01 ferrule according to the process drawing requirements is φ24 steel, but this time without this block size, φ22 substitute. By calculating the compression ratio did not exceed, still within the scope, so we carefully analyzed the cracking situation. Three different types of cracking were found in these materials. (1) the workpiece is a fine crack crack, the crack does not extend inward, but a regular straight crack; (2) the workpiece is cracked open crack, crack V-shaped, and inward extension; (3) The workpiece is regular