本文介绍了50AT道岔钢轨的开发研制过程中孔型设计及试制情况。
The development process including the pass design and trial production of 50AT switch rail is introduced.
采用热力学方法推导出稳态非均匀温度场中孔型零件在受力情况下的热变形公式。
The equations of thermal deformation of hollow piece under stress in uneven steady-state and even steady-state temperature field have been obtained.
分析了原孔型系统及其在生产中存在的问题，并介绍了坯料切换中孔型修改设计的特点和生产情况。
Analyzes the former pass system and its problems existing in the production, introduces the design features of modifying the pass during changing the billet and the production situation.
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