真空热胀形工艺在TC4钛合金筒制造中的应用  

Application of Vacuum Hot Bulging Process in the Manufacturing of TC4 Titanium Alloy Cylinder

作　　者：张贵一[1] 历吴恺 孙敏杰[1] 杨慧芹 陈叔裕 蒋辉 ZHANG Guiyi;LI Wukai;SUN Minjie;YANG Huiqin;CHEN Shuyu;JIANG Hui(Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China)

机构地区：[1]上海航天精密机械研究所,上海201600

出　　处：《上海航天(中英文)》2024年第S2期17-21,共5页Aerospace Shanghai(Chinese&English)

基　　金：国家级项目

摘　　要：为达到钛合金薄壁筒形件的尺寸和圆度要求,工程上常用真空热胀形的工艺方法来实现。但实际生产中,由于钛合金板材存在厚度波动、下料尺寸偏差等情况,导致钛合金薄壁筒形件热校形后尺寸难以精确控制,无法满足产品需求。为解决上述问题,在采用真空热胀形方法基础上,将钛合金筒下料尺寸缩小0.1%~0.3%,即高温下钛合金筒理论内径小于工装外径,钛合金筒高温下发生胀形,并通过高温应力松弛将胀形效果保持下来。真空热胀形方法可有效消除原材料壁厚、下料尺寸偏差带来的尺寸波动,从而实现钛合金薄壁筒形件外径尺寸的精准控制。该方法生产的外径Φ345 mm钛合金筒,其外径尺寸能够控制±0.2 mm范围内。In order to meet the size and roundness requirements of titanium alloy thin-walled cylindrical parts,vacuum hot sizing is commonly used in engineering.In actual production,due to the thickness fluctuations and blanking size deviations of titanium alloy plate,it is difficult to precisely control the dimensions of thin-walled cylindrical titanium alloy parts after hot straightening,which fails to meet the product requirements.In order to solve the above problems,the vacuum hot bulging method is adopted.On the basis of the above,the blanking size of the titanium alloy cylinder is reduced by 0.1%-0.3%.At high temperature,the theoretical inner diameter of the titanium alloy is smaller than the outer diameter of the tooling.The titanium alloy is bulging at high temperature,and the bulging effect is maintained by high temperature stress relaxation.The vacuum hot bulging method can effectively eliminate the size fluctuation caused by the wall thickness of raw materials and the dimensional tolerance of blanking,so as to realize the precise control of the outer diameter of titanium alloy thin-walled cylindrical parts.The outer diameter ofΦ345 mm titanium alloy cylinder produced by hot bulging can be controlled within the range of±0.2 mm.

关 键 词：钛合金筒 真空热胀形工艺 薄壁 筒形件 应力松弛 

分 类 号：TG146.23[一般工业技术—材料科学与工程]