A study of electrodischarge machining-pulse electrochemical machining combined machining for holes with high surface quality on superalloy
A study of electrodischarge machining-pulse electrochemical machining combined machining for holes with high surface quality on superalloy
复制标题
高温合金电火花加工与脉冲电化学加工联合加工高表面质量孔的研究
DOI：
10.1177/1687814015618630
复制
发表时间：
2015-11-01
影响因子：
2.1
通讯作者：
Xu, Wenji
中科院分区：
文献类型：
--
作者：
Ma, Ning;Yang, Xiaolong;Xu, Wenji
涡轮转子叶片表面的非圆孔通常采用电火花加工。在电火花加工过程中，由于加热和冷却速度快，容易在重铸层中产生大量的微孔和微裂纹，这限制了非圆孔在航空航天和飞机工业中的广泛应用。由于脉冲电化学加工的突出优点，提出了电火花加工-脉冲电化学加工组合工艺，以提高电火花加工-钻孔的整体质量。实验研究了脉冲电化学加工工艺参数对表面粗糙度的影响以及电火花加工-脉冲电化学加工方法对孔表面质量和精度的影响。结果表明：随着脉冲电化学加工电流的增大，完全去除重铸层的脉冲电化学加工时间缩短；低脉冲电解加工电流导致重铸层溶解不均匀，而高脉冲电解加工电流导致重铸层溶解相对均匀。脉冲电化学加工后，表面粗糙度从4.277µm减小到0.299µm，自上而下电火花加工引起的孔锥度从1.04°减小到0.17°。由于电火花加工和脉冲电化学加工的优点，电火花加工-脉冲电化学加工组合技术可用于加工具有较高形状精度和表面质量的非圆孔。
Noncircular holes on the surface of turbine rotor blades are usually machined by electrodischarge machining. A recast layer containing numerous micropores and microcracks is easily generated during the electrodischarge machining process due to the rapid heating and cooling effects, which restrict the wide applications of noncircular holes in aerospace and aircraft industries. Owing to the outstanding advantages of pulse electrochemical machining, electrodischarge machining–pulse electrochemical machining combined technique is provided to improve the overall quality of electrodischarge machining-drilled holes. The influence of pulse electrochemical machining processing parameters on the surface roughness and the influence of the electrodischarge machining–pulse electrochemical machining method on the surface quality and accuracy of holes have been studied experimentally. The results indicate that the pulse electrochemical machining processing time for complete removal of the recast layer decreases with the increase in the pulse electrochemical machining current. The low pulse electrochemical machining current results in uneven dissolution of the recast layer, while the higher pulse electrochemical machining current induces relatively homogeneous dissolution. The surface roughness is reduced from 4.277 to 0.299 µm, and the hole taper induced by top-down electrodischarge machining process was reduced from 1.04° to 0.17° after pulse electrochemical machining. On account of the advantages of electrodischarge machining and the pulse electrochemical machining, the electrodischarge machining–pulse electrochemical machining combined technique could be applied for machining noncircular holes with high shape accuracy and surface quality.