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仪表的外壳多采用压铸、塑压及冷冲引伸等工艺方法制造。图1所示的壳体制件,材料为锻铝LD5,壁厚8毫米,底厚3毫米,由于仪表有特殊要求,不允许用铸造的方法制造。在试生产时,采用棒料切削加工的方法,劳动强度大,生产效率很低,不仅使70％的金属材料变为废屑,而且质量很不稳定。从提高壳体制件的质量、产量和降低生产成本的要求看,采用切削加工的工艺方法已没有多大改进余地。
Instrument shell and more use of die-casting, plastic pressure and Leng Chong extension and other manufacturing methods. The housing part shown in Figure 1 is made of wrought aluminum LD5, with a wall thickness of 8 mm and a bottom thickness of 3 mm. Due to the special requirements of the instrument, castings are not allowed. In trial production, the use of bar cutting method, labor-intensive, low productivity, not only make 70% of the metal material into waste, and the quality is very unstable. From improving the quality of the shell parts, production and reduce the cost of production requirements, the use of cutting process technology has not much room for improvement.