(西北有色金属研究院，西安 710016)
摘 要: 介绍扩径推弯法成形原理以及影响弯头成形尺寸和形状的重要扩径推弯技术参数。技术参数的设定包括成形模羊角芯头的设计、芯头材料选择、感应加热圈的设计、扩径弯头温度和温度沿芯头的分布、扩径推弯速度和成品尺寸控制等。不同材质弯头由于物理特性和不同温度下的拉伸性能存在差异，可根据管坯材料特性，选择不同加工工艺参数，以保证弯头的形状、尺寸精度。
关键字: 弯头；扩径推弯法；羊角芯头
diameter-expanding and pushing
（Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China）
Abstract:The forming principle of elbow made by diameter-expanding and pushing and the important technology parameters affecting the elbow size and shape were introduced. The technology parameters include design of forming mould ram’s core, choice of core material, design of inductive heating loop, temperature of elbow made by diameter-expanding and pushing, temperature distribution along ram’s core, rate of diameter-expanding and pushing and the size control of finished size. Due to the difference of physical properties and tensile strength for the elbow of different materials at high temperature, different processing technology parameters should be chosen to assure the shape and dimensional accuracy of elbow according to the material characters.
Key words: elbow; method of diameter-expanding and pushing; ram’s core
