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1. 汽缸的负荷增减过快，特别是快速的启动、停机和工况变化时温度变化大、暖缸的方式不正确、停机检修时打开保温层过早等，在汽缸中和法兰上产生很大的热应力和热变形。

2. 汽缸在机械加工的过程中或经过补焊后产生了应力，但没有对汽缸进行回火处理加以消除，致使汽缸存在较大的残余应力，在运行中产生的变形。

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