摘要
针对小锥角零件(半锥角α=7°)的成形,以LF2,LF6,LF21铝板料为原料,采用先预制坯后多道次剪旋的成形方案,试验研究了材料塑性、工艺参数和壁厚减薄率对旋压件成形质量的影响,确定了成形小锥角零件的合理方案.研究表明:材料的塑性对可旋性有很大影响,为获得较高的成形极限,材料应同时具有较好的塑性和适当的加工硬化性;在每道次前均退火的条件下,合理的道次分配方案是前一道次在材料的成形极限范围尽量减薄,而最终道次减薄率需控制在一定的范围内(50%以内);旋压过程中保持一定的负偏离(3%左右),同时采用较大的进给比有利于提高旋压件精度.
To fabricate small-angle conical workpieces(the semi-cone angle α=7°), the multi-pass shear spinning technology with pre-drawing has been put forward using LF2,LF6,LF21 aluminum alloy sheet blanks according to the experimental device,and high quality workpieces have been turned out successfully. The results show that the plasticity of materials has great influence on their spinnability and the materials should have excellent plasticity together with proper work-hardening property to gain high forming limit. By means of annealing every pass, the reasonable scheme of pass design is that the wall thickness should be reduced as much as possible within the forming limit in the preceding passes and in the last pass the reduction rate should be in a certain range(less than 50%). Moreover, keeping negative error(3% or so) of wall thickness and adopting big feeding rate are beneficial to improve the precision of spinning parts.
出处
《材料科学与工艺》
EI
CAS
CSCD
2004年第1期33-36,40,共5页
Materials Science and Technology
