用数值模拟方法改进淬火夹具结构和装夹方法以减少淬火畸变

Improved quenching clamp structure and mount method with numerical simulation calculation for reducing quenching distortion

用淬火过程的数值模拟方法,结合FLUENT和ANSYS软件的优势,从流体力学的角度提出减少薄壁壳体淬火畸变的工艺措施。结果表明,改进淬火夹具结构,将底板上导流孔的分布与工件放置位置结合起来,并在底板上放置工件的中心位置增设大孔,提高壳体下部的对流换热效率,使工件外表面淬火畸变减小约24.4%;淬火装夹方法采用悬挂方式时,工件淬火过程的温度分布更加均匀,工件外表面淬火畸变减小约33.4%。采用改进淬火夹具结构来减少淬火畸变的工艺措施更符合生产实际情况。

Process method of reducing quenching distortion of thin-wall parts was pointed out on the theory of fluid mechanics by adopting numerical simulation in quenching cooling process and using advantage of FLUENT and ANSYS software.The results show that structure of clamps is improved,the distribution of guide hole in the clamps is designed corresponding to the position of workpiece,and a new big hole in the clamps is added at the central position of placing workpiece.These methods are increasing convection heat transfer efficiency at the lower part of the shell.The distortion of outside surface is decreased by 24.4%.The other process measure is hinging workpiece in the quenching oil.The difference of temperature between inside and outside shell is greatly decreased.The distortion of outside surface is decreased by 33.4%.The process measure of improving the structure of clamps is more in accordance with production practice.