钛合金锥形构件变温热拉深成形壁厚均匀性控制  

Control of Wall Thickness Uniformity in Variable Temperature Hot Drawing of Titanium Alloy Conical Components

作　　者：王安阳 卢振[2] 蒋少松[2] 王辰曦 Wang Anyang;Lu Zhen;Jiang Shaosong;Wang Chenxi(Shenyang Aircraft Industry(Group)Co.,Ltd.,Shenyang 110000;Harbin Institute of Technology,Harbin 150001)

机构地区：[1]沈阳飞机工业(集团)有限公司,沈阳110000 [2]哈尔滨工业大学,哈尔滨150001

出　　处：《航天制造技术》2021年第1期36-39,共4页Aerospace Manufacturing Technology

基　　金：国家自然科学基金(51675126)。

摘　　要：针对现有钛合金等温拉深过程中壁厚均匀性差的问题,开发了变温热拉深成形新技术,结合等温热拉深成形有限元分析及变温热拉深成形工艺试验,分析了变温拉深成形的工艺优势。成形试验在热成形机中进行,模具凹模与板料在热成形机中加热至成形温度(700~800℃),通过向凸模内通入冷却介质来控制凸模温度(低于板料温度),热拉深过程冷凸模底部与板料中心接触,板料在变形的过程中温度降低至屈服温度以下后不再变形,未接触到凸模的板料继续变形,解决了锥形构件热拉深过程底部过度减薄的难题。工艺试验发现采用变温热拉深成形的TC4钛合金锥形件,底部与边缘部分厚度偏差在10%以内,底部减薄现象得以改善,有效地控制了底部中心附近的厚度,使变形更均匀。In order to solve the problem of poor uniformity of wall thickness in the process of isothermal drawing of titanium alloy,a new technology of variable temperature hot drawing is developed in this paper.Combining with the finite element analysis of isothermal hot drawing and the process test of variable temperature hot drawing,the advantages of variable temperature deep drawing are analyzed.The forming experiment is carried out in the hot forming machine.The die and sheet metal are heated to the forming temperature(700~800℃)in the hot forming machine.The temperature of the punch(lower than the sheet metal temperature)is controlled by injecting cooling medium into the punch.The bottom of the cold punch contacts with the sheet metal center in the process of hot drawing.The sheet metal will not deform after the temperature drops below the yield temperature and does not contact the punch As a result,the problem of excessive thinning at the bottom of the conical component during hot drawing is solved.The process test shows that the thickness deviation between the bottom and the edge of TC4 titanium alloy conical parts formed by variable temperature hot drawing is less than 10%,and the thinning phenomenon at the bottom is improved.The thickness near the bottom center is effectively controlled,which makes the deformation more uniform and improves the performance of the formed parts.

关 键 词：钛合金锥形件 变温热拉深 冷凸模热凹模 壁厚均匀性 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程] TG386.32[金属学及工艺—金属压力加工]