高温合金小孔微细螺旋铣削工艺参数研究

Study on process parameters of micro helical milling small holes in superalloy

高温合金具有良好的耐高温性、抗氧化性和耐腐蚀性,广泛应用于航空航天、能源工业等领域。由于高温合金抗拉强度高、导热系数低、在切削加工中发生塑性变形的抗力大以及切削热集聚和加工硬化严重,是典型的难加工材料,故采用切削方式在高温合金零件上制作小孔具有挑战性。采用螺旋铣孔的方式对钴基高温合金GH605进行小孔加工,设计并进行微细螺旋铣孔正交试验,探究关键铣削参数(主轴转速n、进给速度v f和螺距s)对切削力F、切削温度T和孔壁表面粗糙度Ra的影响规律。基于试验数据极差分析的结果,并进行螺旋铣削关键参数优化,成功实现高质量直小孔和斜小孔的微细螺旋铣削加工。

Superalloys have good high temperature resistance,oxidation resistance and corrosion resistance,which are widely used in aerospace,energy,and other fields.However,due to their high tensile strength,low thermal conductivity,large resistance to plastic deformation during cutting,serious cutting heat agglomeration and work hardening,superalloys are considered difficult-to-machine materials,so it is challenging to make small holes on superalloy by cutting.The small hole machining of GH605 cobalt-based superalloy was carried out by means of helical milling.The orthogonal experiment of micro helical milling was designed and carried out to explore the influence of key milling parameters(spindle speed n,feed speed v f,and pitch s)on cutting force F,cutting temperature T and surface roughness Ra of hole wall.Based on the range analysis results of the experimental data,the appropriate cutting parameters were selected,and the micro helical milling of straight holes and inclined holes were successfully carried out.