(1. 西北工業(yè)大學(xué) 材料學(xué)院，西安 710072；
2. 沈陽黎明航空發(fā)動(dòng)機(jī)(集團(tuán))有限責(zé)任公司，沈陽 110043)
摘 要: 對(duì)TC4鈦合金在變形溫度為940 ℃、外徑、內(nèi)徑和高度之比為20:10:7的圓環(huán)進(jìn)行圓環(huán)鐓粗實(shí)驗(yàn)，并采用有限元軟件DEFORM−3D對(duì)鐓粗過程進(jìn)行模擬。結(jié)果表明：熱傳導(dǎo)系數(shù)對(duì)摩擦因數(shù)的測定有很大影響，熱傳導(dǎo)系數(shù)增加導(dǎo)致工件與模具的接觸面溫度下降，摩擦增加；對(duì)于不同的潤滑介質(zhì)應(yīng)采用不同的熱傳導(dǎo)系數(shù)進(jìn)行模擬，從而建立不同的理論校準(zhǔn)曲線。采用不同的熱傳導(dǎo)系數(shù)分別建立玻璃潤滑和干摩擦條件下的理論校準(zhǔn)曲線，結(jié)合圓環(huán)鐓粗實(shí)驗(yàn)，最終得出TC4鈦合金940 ℃高溫變形時(shí)在干摩擦和玻璃潤滑條件下的摩擦因數(shù)值分別為0.59和0.42。
關(guān)鍵字: 圓環(huán)鐓粗實(shí)驗(yàn)；有限元模擬；熱傳導(dǎo)系數(shù)；摩擦因數(shù)
（1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;
2. Avic Shenyang Liming Aero-Engine (Group) Co., Ltd., Shenyang 110043, China）
Abstract:The ring-compression test of Ti-6Al-4V alloy was carried out at 940 ℃ and the ratio of outer diameter, inner diameter, height of 20:10:7. And the ring compression process was simulated by means of DEFORM−3D software. The results show that the effect of heat-transfer coefficient on measurement of friction factor is significant. The increase of heat-transfer coefficient results in the decrease of interfacial temperature between the workpiece and dies, and in turn leads to the increase of friction. Therefore, for various lubricant media, different heat-transfer coefficients should be chosen to conduct the FE simulation and establish different calibration curves. Combined with the ring-compression test, different heat-transfer coefficients for glass lubricant and dry friction condition are selected to establish the calibration curves, and finally the friction factors of TC4 titanium alloy under high temperature (940 ℃) deformation for dry friction and glass lubricant condition are determined to be about 0.59 and 0.42, respectively.
Key words: ring-compression test; FE simulation; heat-transfer coefficient; friction factor
