一、前言由于熔铝注入锭模后的冷却收缩,使所有的铝合金材料都产生内应力。如果这些铸锭用作生产所需形状成品毛料(棒、厚板及薄板毛料),那么,在对材料进行一系列加工时,可使内应力明显减少。例如,棒坯用于切制螺纹产品的加工,铸锭按挤压所需尺寸的机械加工, I. INTRODUCTION As the cooling shrinkage after the molten aluminum is injected into the ingot mold, all the aluminum alloy materials generate the internal stress. If these ingots are used to produce finished wool (rods, slabs, and sheets) in the shape of a finished product, the internal stresses can be significantly reduced during a series of processing of the material. For example, the billet is used to cut the thread product processing, ingot extrusion press the required size of machining,