核燃料防屑板的激光增材制造技术研究

Research on laser additive manufacturing technology for the anti debris plate of fuel assembly

压水堆核燃料防屑板属于精密加工零件,产品的尺寸精度和力学性能要求非常高。防屑板目前采用电火花加工工艺,需要在210 mm2左右的方形薄板上加工上千个异形方孔,单件零件加工周期长且效率低。为适应自主化新型核燃料量产需求,有必要对国际上先进的激光制造技术进行研究,找到兼顾质量和效率的新型加工方法。文中项目从原材料制备、制造工艺、后处理方法等角度,研究了先进激光SLM制造技术在核燃料防屑板产品加工中的应用。研究结果对解决自主化核燃料制造技术难题、提高核燃料制造技术水平具有重要的意义。

The anti debris plate of fuel assembly for the PWR is a precision machined part,which requires high dimensional accuracy and mechanical properties. At present,the anti debris plate adopts the EDM technology,which needs to process thousands of special-shaped square holes on the 210 mm square thin plate. The machining cycle of a single part is long and the efficiency is low. In order to meet the demand of mass production of new nuclear fuel,it is necessary to study the advanced laser manufacturing technology in the world and find a new processing method that takes both quality and efficiency into account. From the perspectives of raw material preparation,manufacturing process and post-processing methods,the project studies the application of advanced laser SLM manufacturing technology in the processing of the anti debris plate of fuel assembly. The research results are of great significance to solve the technical problems of autonomous nuclear fuel assembly manufacturing and improve the technological level of fuel assembly manufacturing technology.