大长径比铝合金异形件精密旋压成形工艺研究

Study of Netshape Spinning Procee of Al-alloy Alien Piece with large Aspect Ratio

摘要:

通过工艺试验及组织性能分析，研究了变形温度、道次和减薄率、进给比对大长径比铝合金异形件旋压成形的影响，优化的特征旋压温度为370~420 ℃、变形道次为10~12道次、道次减薄率为20~25 %、总减薄率为35~50 %、普旋进给比为2.0~2.5 mm/r、强旋进给比为1.3~1.8 mm/r。采用上述工艺实现了大长径比异形旋压件经历1次装卡由板材直接成形，大幅提升了生产效率，同时满足构件“控形”和“控性”要求，其壁厚差≤0.2 mm，内型面与理论型面单边间隙≤0.1 mm，旋压变形后抗拉强度和延伸率基本不变、而屈服强度提高10.1 %。

Abstract:

It is studied that effect of temperature, passes, thinning rate and feed ratio for alien piece with large aspect ratio during spinning formed, though processing test and analysis of microstructure and mechanical properties. It is respectively optimized that characteristic temperature is 370~420 ℃, deformation passes is 10~12 passes, thinning rate both every pass is 20~25 % and whole process is 35~50 %, and feed ratio of ordinary spinning is 2.0~2.5 mm/r, and feed ratio of strong spinning is 1.3~1.8 mm/r. It is achieved that alien piece with large aspect ratio spinning formed directly from sheet material which is undergoed only one time card loading. The process aboved not only improved production efficiency significantly, but also simultaneously fufil requirements of controling shape and properties. The wall thickness difference of alien piece with large aspect ratio is no greater than 0.2 mm, and the unilateral gap between inner profile and theoretical model is not higher than 0.1 mm. Relatived to the original plate, the ultra tensile strengrh and elongation of alien piece with large aspect ratio basically unchanged, and the yield strength increased 10.1 %.