钛合金型材热张力矫形过程温度均匀性控制研究  

Research on Temperature Uniformity Control of Titanium Alloy Profile in Thermal Tension Reshaping Process

作　　者：冯红超[1] 代春[1] 徐哲[1] 张少丹 Feng Hongchao;Dai Chun;Xu Zhe;Zhang Shaodan(Baoji Titanium Industry Co.,Ltd.,Baoji 721014,China)

机构地区：[1]宝鸡钛业股份有限公司,陕西宝鸡721014

出　　处：《钛工业进展》2024年第4期38-41,共4页Titanium Industry Progress

基　　金：国家重点研发计划项目(2017YFB306200)。

摘　　要：钛合金型材截面形状复杂,热挤压后由于截面各处散热不均,易产生扭拧、弯曲等形状缺陷,矫形难度大。热张力矫形是实现钛合金型材矫形的最有效方式,而矫形过程中型材温度的均匀性控制是实现高精度矫形的关键。以TA15钛合金薄壁锐角L型材为研究对象,研究了加热及冷却过程中型材截面各处温度的分布规律。结果表明,钛合金型材热张力矫形时,加热过程中随着加热温度的升高,型材头部、中部、尾部的温差逐渐增大,中部温度高于两端,加热至设定温度700℃时温差达50℃。冷却过程中,型材同一截面其边部温降较角部快,最高温差达100℃,随着冷却温度的降低,这种温差逐渐减小。在钛合金型材热张力矫形时,加热到设定温度后持续通电约2 min,冷却过程中用石棉布包裹型材可有效提高温度的均匀性,实现高精度矫形。The cross section of titanium alloy profile is complex.And after hot extrusion,due to uneven heat dissipation at different positions of the cross section,shape defects such as twisting and bending are prone to occur,making it difficult to reshape.Thermal tension reshaping is the most effective way to achieve reshaping of titanium alloy profiles,and the temperature uniformity control of profile is the key to achieving high-precision correction.Taking TA15 titanium alloy thin-walled acute angle L-shaped profile as the research object,the distribution law of temperature at different positions of the profile cross section during heating and cooling processes was studied.The results show that during the thermal tension reshaping of titanium alloy profile,the temperature difference between the head,middle,and tail of the profile gradually increases with the increase of heating temperature during the heating process.The temperature in the middle of profile is higher than that at both ends,and the temperature difference reaches 50℃when heated to the set temperature of 700℃.During the cooling process,the temperature at the edges of the same section of the profile decreases faster than at the corners,with a maximum temperature difference of 100℃.As the cooling temperature decreases,the temperature difference gradually decreases.During the thermal tension reshaping of titanium alloy profiles,heating to the set temperature and continuously energizing for about 2 minutes,wrapping the profile with asbestos cloth during the cooling process can effectively improve temperature uniformity and achieve high-precision correction.

关 键 词：钛合金型材 热张力矫形 温度均匀性 

分 类 号：TG146.23[一般工业技术—材料科学与工程]