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