Method for relieving residual stress in cast-in-place liners of HPDC engine blocks

A method for relieving residual stress in cast-in-place liners of high pressure die cast (HPDC) engine blocks to prevent cracking in the liners during the machining process. The method includes locally heating up the liners and the surrounding engine block material through rapid induction heating and then cooling down the liners and surrounding engine block material with still ambient air to a predetermined temperature after the residual stress has been reduced to a desired threshold. 种用于在加工过程中消除高压压铸(HPDC)发动机机体的现铸衬套中残余应力以防止衬套中开裂的方法。该方法包括通过快速感应加热局部加热衬套和包围的发动机机体材料，然后在残余应力降至所需的阈值之后利用静止环境空气将衬套和包围的发动机机体材料冷却至预定温度。