大型核电变截面入口管内高压液力胀形数值模拟

The Numerical Simulation of Internal High-pressure Hydraulic Expansion Forming Process in a Large-sized Nuclear Variable Cross-section Inlet

针对大型核电复杂截面不锈钢入口管加工制造困难和浪费材料的问题,研究了内高压液力胀形的新方案。首先根据半径和壁厚的关系设计初始毛坯,然后用DEFORM-3D进行了数值模拟,对不同尺寸的毛坯在液压胀形过程中的力能参数、变形分布进行了分析,求得了合理结构的便于加工制造的毛坯。从而节省材料,提高了制件质量,满足了生产要求。

Aiming at some problems including difficulty and waste in the handling and manufacture of a largesized nuclear complicated cross-section stainless steel inlet tube, a new internal high-pressure hydraulic expansion forming process has been researched. Firstly, the initial blank has been designed according to the relation of radius and wall thickness, and then the whole deformation process has been numerically simulated by means of DEFORM- 3D. By analyzing the parameter of power energy and deforming distribution in the process of hydraulic expansion forming for variant dimensional blank, the rational structural blank has been gained. It is convenient for machining and manufacture, which saves material, improves quality and meets the manufacturing requirements.