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凡是用不耐磨和硬度较低的材料(如铝合金、镁合金等)制成的零件,其上面一些要与轴相配合的孔中,一般都压入用耐磨或硬度较高的材料(如铜合金、合金钢等)制成的衬套,简称压套。以前,一直沿用苏联四十年代的有铰量压套旧工艺,即衬套压入零件基体后,还需进行手铰加工。这种有铰量压套工艺方法,由于不同规格尺寸的衬套内径余量不等(0.3～0.7毫米),当压入基体后,因铰削力过大,容易产生铰动衬套现象,并且质量不稳定。又由于零件复杂,只得采用手铰,因此劳动强度大,
All with non-wear and hardness of the lower material (such as aluminum, magnesium alloy, etc.) made of parts above the shaft to be matched with the hole, usually pressed into the use of wear-resistant or hardness of the material (Such as copper alloy, alloy steel, etc.) made of bushings, referred to as pressure sleeve. In the past, the old technique of the hinge-type pressure sleeve in the Soviet Union of the 1940s has been used. After the sleeve is pressed into the part base, hand hinge processing is also required. This method of hinge caliper process, due to different sizes of bushing bore allowance ranging (0.3 ~ 0.7 mm), when pressed into the substrate, the hinge force is too large, prone to hinge bushing phenomenon, And the quality is not stable. And because of the complex parts, had to use the hand hinge, so labor-intensive,