一、前言国民经济的不断发展,对热挤压铝合金厚壁管材的内表面质量提出了新的严格的要求.本文扼要地分析了热挤压铝合金厚壁管材的生产方法及其特点,在总结生产实践经验的基础上提出了能显著改善厚壁管材内表面质量的空心铸锭无润滑热挤压铝合金厚壁管材新工艺.并详细地阐述了这种工艺的参数、特点、优越性,以及工艺操作中可能出 I. Introduction The continuous development of the national economy has put forward new and stringent requirements on the quality of the inner surface of the hot-extruded aluminum alloy thick-walled pipe.This article briefly analyzes the production methods and characteristics of the hot-extruded aluminum alloy thick-walled pipe, On the basis of summing up the practical experience of production, a new process of non-lubricated hot extrusion aluminum alloy thick-walled pipe with hollow ingot which can remarkably improve the quality of the inner wall of thick-walled pipe was put forward. The parameters, characteristics and superiority of the process As well as possible during process operations