数铣加工铝合金真空钎焊薄壁零件质量控制

Quality Control of Aluminum Alloy Vacuum Fiber Welding Thin-walled Parts Processed by Digital Milling

铝合金真空钎焊薄壁零件广泛应用于航空业各类产品,但因其刚性差使得加工过程中极易产生振动而出现变形,同时后续钎焊工艺对机加工的尺寸精度、形位精度尤其焊接面平面度(小于0.1mm)要求高,导致其机加工过程复杂、困难。本文以某类真空钎焊薄壁框架零件为研究案例,结合多次加工实践,找出其中精度控制的关键要素,经分析并通过不断迭代优化,最终形成了包含工艺路线、装夹方式、热处理方式等一整套行之有效的工艺文件,保证了此类零件的加工精度。

Aluminum alloy thin-walled brazed parts are widely used in various products of aviation industry.However,due to the poor rigidity,vibration and deformation are easy to occur in the machining process.At the same time,the following brazing process requires high dimensional accuracy,shape and position accuracy,especially the flatness of welding surface(less than 0.01 mm).The machining process is complicated and diffcult.Vacuum brazed thin-walled frame parts are taken as a case study,and the key elements of precision control are found out through many machining practices.After analysis and continuous iterative optimization,a set of effective process documents including process route,clamping mode and heat treatment mode are finally formed,which ensures the machining precision of this kind of parts.