1、ge the machining of less important and small surfaces in the last operation, such as the machining of a bolt hole. * * 2626SCUTSCUT 3.8.5.2 Arrangement of heat and surface treatment In order to improve the mechanical and cutting performance of the material, heat treatment is often arranged during ma
2、chining. Annealing and normalising can release the internal stress and improve the cutting performance of material. Arranged before machining, sometimes normalized after rough machining For some large and complex casting, in order to reduce the deformation caused by internal stress, a manual time- d
3、ependent stress release treatment(人工时效处理） is often arranged after rough machining, but it is better to arrange a natural time-dependent treatment（自然时效） before rough machining. * * 2727SCUTSCUT Quality treatment(调质处理）can improve the mechanical performance of the material. Thus, many medium carbon ste
4、els and alloy steels are often treated by this method. Arranged before (sometimes after) rough machining Quenching or carbonising treatment can raise the surface hardness and wear resistance. Arranged before grinding or after final operation. Surface treatment (including electroplating and oxidising
5、) can raise the corrosion resistance and wear resistance, and improve the appearance. Arranged in the end. * * 2828SCUTSCUT 3.8.5.2 Arrangement of heat and surface treatment 3.8.5.3 Arrangement of inspection operation3.8.5.3 Arrangement of inspection operation Inspection is the most important operat
6、ion in ensuring product quality and avoiding rejects. In each operation, the operator should inspect the product himself . On the basis of this, an independent inspection operation should be arranged under the following conditions such as after all the rough machining, before the finish machining an
7、d after delivering to other workshop, before and after important operations, and after the final operation. 3.8.5.4 Arrangement of other operations 3.8.5.4 Arrangement of other operations During the operation, some assistant operations such as deburring, demagnetising and rinsing can be arranged aft
8、er some operations when needed. * * 2929SCUTSCUT * * SCUTSCUT3030 5) selection of machine tools, technical equipment (including cutting tools, fixtures and inspection tools) and auxiliary tools for each operation.（机床设备、工艺装备和辅助工序） 6) selection of metal removal, operation dimensions and tolerances for
9、 each operation（各工序的加工余量、工序尺寸 ） 7) Selection of metal cutting parameters and standard operation times .（确定各工序的切削用量及工时定额） 8) Technical economical analysis（技术经济分析） 9) Form the process file Other step * * 3131SCUTSCUT ThanksThanks 哥首都墨西哥城，警察在毒行中逮捕一名毒嫌疑人。据墨 官方的告，墨西哥在今年4个多月的毒行中已 4万余吨大麻、262吨 可卡因，抓127名毒分子。
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