(1. 中南大學(xué) 高性能復(fù)雜制造國家重點(diǎn)實(shí)驗(yàn)室，長沙410083；
2. 中南大學(xué) 機(jī)電工程學(xué)院，長沙 410083)
摘 要: 為實(shí)現(xiàn)徑厚比達(dá)1 400的鎳基合金薄壁筒減薄旋壓，研究工藝參數(shù)對旋壓穩(wěn)定性的影響，建立超薄壁大徑厚比筒形件旋壓的數(shù)值仿真模型，分析主軸轉(zhuǎn)速和旋輪進(jìn)給速度等工藝參數(shù)對旋壓變形穩(wěn)定性的影響規(guī)律和不同工藝參數(shù)下金屬材料的流變規(guī)律，結(jié)合數(shù)值模擬的結(jié)論旋壓出徑厚比達(dá)1 400的筒形件。結(jié)果表明：當(dāng)主軸轉(zhuǎn)速為160 r/min、旋輪進(jìn)給速度為40 mm/min、旋輪圓角半徑為6 mm，減薄率為30%、工模間隙率為5%時(shí)，旋壓過程中工件內(nèi)壁將出現(xiàn)一個(gè)均勻的鎖模環(huán)，加載區(qū)局部材料在鎖模環(huán)的約束下發(fā)生定向流變，使超薄壁筒形件在旋壓過程中保持足夠的穩(wěn)定性。
關(guān)鍵字: 減薄旋壓；鎖模環(huán)；大徑厚比；鎳基合金
（1. State Key Laboratory of High Performance and Complex Manufacturing,
Central South University, Changsha 410083, China;
2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China）
Abstract:The effects of process parameters on the stability of spinning were studied to achieve the power spinning of nickel-based alloy thin-walled tube with diameter-thickness ratio of 1 400. The numerical simulation model of the spinning of extra-thin-walled tube with high diameter-thickness ratio was established, the effects of process parameters such as the spindle speed and the spin roller feed rate, on the spinning deformation stability were analyzed. The rheological regulation of the metal material was discussed. A tube with diameter-thickness ratio up to 1 400 was spun with the conclusion of numerical simulation. The results show that, with spindle speed of 160 r/min, spin roller feed rate of 40 mm/min, spin roller fillet radius of 6 mm, thinning rate of 30%, clearance ratio of 5%, a uniform mold-lock ring is generated on the inner wall of the tube in the spinning process. The directional flow and deformation of local materials in load restriction maintains the stability of the extra-thin-walled tube in the spinning process.
Key words: power spinning; mold-lock ring; high diameter-thickness ratio; nickel-based alloy
