A plastic working method that flows out of a specific die hole to obtain the desired cross-sectional shape and size, and is mainly used for the production of bars, tubes and profiles of stainless steel, nickel-based superalloys and refractory alloys.
Hot extrusion is the earliest extrusion technology used in several extrusion processes. It is a variety of extrusion molding of metal by means of the good plasticity of the material at hot forging temperature. At present, 热挤压主要用于制造长型材, 简介, 管道, 棒材及普通等截面的各种机械零件.
热挤压不仅可以成型塑性低的有色金属及其合金, 强度相对较低, 低的- 和中碳钢, 以及高强度的高碳钢和高合金钢, 如特殊结构, 不锈钢和高速. 工具钢和耐热钢. 由于坯料必须加热到热锻温度才能进行挤压, 常伴有氧化、脱碳等较严重的加热缺陷, 影响挤压件的尺寸精度和表面粗糙度. 一般来说, 机器零件热挤压后, 切削等加工用于提高零件的尺寸精度和表面质量.
