铝材灯饰零件对镀层光亮度和结合力有着比较高的要求，采用电镀加工方法废品率高。
The excellent brightness and cohesion of the plating layer are needed for aluminium lamp finishing parts.
包络法加工复杂异形螺杆比其它加工方法效率高，但仍不能满足用户对高生产效率的要求。
The envelope method of processing special spiral rod is more efficient than others but it cannot satisfy the requirement of the clients.
该专用夹具对刀方便，工件定位精度高，满足工件加工要求。
The special fixtures are convenient to adjust the tool, and the accuracy of positioning work piece is high, thus, the processing requirements are contented.
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