盘形件局部加热旋压增厚过程设计  

Process design for local-heating rotary thickening of disc-like blanks

作　　者：胡运展 金俊松[1] 王新云[1] 邓磊[1] 吴文魁[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点试验室,湖北武汉430074

出　　处：《塑性工程学报》2017年第1期9-14,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51205144)

摘　　要：针对薄辐板厚轮缘盘形件提出一种局部加热旋压增厚成形方法。通过数学建模,得到了变形前沿即加热热源位置随时间变化的规律并给出了相应的加热功率,计算结果表明,在增厚过程中火焰喷枪近似匀速向圆板中心推进,在历经不同温度分区时,需要施以不同功率才能使变形前沿温度达到目标温度。以半径191 mm、厚度2.5 mm的圆形板料为例进行工艺实验,实验中,旋轮沿径向向内进给压缩轮缘的同时,火焰随着变形区前沿的变化而向内移动。实验结果表明,局部加热能使工件心部支撑材料保持足够的刚度抵抗失稳的产生,单道次增厚比可以达到2以上,与冷旋相比,能显著提高增厚效率。A local-heating rotary thickening process was proposed for the forming of disc-like blanks with thin plate and thick rim. Based on mathematical modeling, the variation regularity of deformation frontier, i. e. , heat source over time was acquired, with corresponding heating power calculated. The calculated results show that the heaters should move towards the blank center in an approximate constant speed and the heating power should be timely adjusted to make sure the target temperature of the deformation front. Disc-like blanks with 191 mm in radius and 2. 5 mm in thickness were used in experiments to validate the process design. In which, the rim was compressed by the roller in radial direction, meanwhile, the heater moved towards the blank center following the deformation front. The experiments re- suits show that the center portion of the blank can provide adequate stiffness to overcome the buckling, the single-pass thickening ratio can reach a value over 2, and the thickening efficiency is significantly improved compared to that of the cold rotary forming.

关 键 词：局部加热 旋压 边缘增厚 数学建模 

分 类 号：TG376[金属学及工艺—金属压力加工]