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从弹、塑性力学原理出发,计算了缸套从铸坯到淬火各工序的应力。用XYL型应力测试仪测定缸套各加工工序的残留应力。离心缸套外表层具有较大的压应力,对淬火开裂并非有害。机加工后,外表层仍处于压应力状态,其数值与理论计算值大致相符。缸套内表面淬火加热时,外表面出现相当大的拉应力是淬火开裂的外在原因,降低加热时,内、外表层温差可以降低外表层的拉应力及内表层的压应力,有效地消除了淬火开裂现象。采用这种淬火工艺可以细化淬火层马氏体组织,提高它的硬度,并降低了奥氏体残留量,从而增加了缸套耐磨性,收到了改善缸套内在质量的效果。
From the bomb, plasticity mechanics principle, calculated the cylinder liner from quenching to the stress of each process. XYL-type stress tester cylinder liner determination of the residual stress of each process. Centrifugal cylinder liner outer surface has greater compressive stress, quench cracking is not harmful. After machining, the outer layer is still in the state of compressive stress, its value is roughly consistent with the theoretical calculation. Cylinder liner surface quenching and heating, the outer surface of the considerable tensile stress quenching and cracking is the external cause, reducing heating, the inner and outer surface temperature difference can reduce the tensile stress of the outer surface and the inner surface of the compressive stress, effectively eliminating Quench cracking phenomenon. The use of this quenching process can refine the martensite hardened layer to increase its hardness and reduce the amount of retained austenite, thereby increasing the wear resistance of the liner, received the effect of improving the internal quality of the liner.