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本发明对于金属零件提出了一种新颖的加工方法,特别是那些用于动态负载工况下的零件加工,诸如钢板弹簧、扭力杆、螺旋弹簧及类似的零簧部件,可以相应地提高这些零部件在使用过程中的耐疲劳和耐应力腐蚀的能力。这实际上是采用对非奥氏体材料进行适当的冷激、冷加工、从而获得意想不到的有益结果。本发明中的新颖加工方法在于将热处理后的非奥氏体钢或亚共晶金属材料成形到钢板弹簧的形状,然后将钢板弹簧冷却到环境温度以下,最好在0℉以下,一般都冷却到-40℉,接着对已致冷的钢板弹簧至少一个表面立即进行喷丸处理,使钢板弹簧的表面产生残余压应
The present invention proposes a novel processing method for metal parts, in particular those parts used for dynamic load conditions, such as leaf springs, torsion bars, coil springs and similar spring parts, which can be correspondingly increased Parts in the process of fatigue resistance and stress corrosion resistance. This is actually the use of non-austenitic materials, the appropriate cold shock, cold work, so as to obtain unexpected beneficial results. The novel processing method of the present invention consists in shaping the heat-treated non-austenitic or hypo-eutectic metallic material into the shape of a leaf spring and then cooling the leaf spring to below ambient temperature, preferably below 0 ° F, generally cooling To -40 ° F, followed by shot peening of at least one surface of the leaf spring which has been cooled, so as to generate a residual pressure on the surface of the leaf spring