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一 設計方面的問題 1.工艺方面 1)汽車上部分零件的防銹,在原設計上采用磷化处理,但因中国化学工業落后,馬日夫鹽未大量生产,因此改用鍍鋅。鍍鋅15微米的費用比磷化处理低廉好几倍(鍍鋅15微米每平方公尺1元左右,而磷化处理5元左右),而其防銹能力远胜于磷化处理。 2)軸瓦在世界各国几乎都采用鍍錫,因苏联錫矿稀少,錫的价格比鎳貴6倍。鍍銅層質量次于鍍錫,鍍銅層中常有粗而硬的晶粒,直接影响机械加工后軸瓦的表面光潔度(▽▽▽▽_(10))。按生产中实际統計数字,鍍銅的軸瓦在机械加工(拉床上拉)后因达不到表面光潔
A design problem 1. Process aspects 1) Anti-rust on some parts of automobiles. Phosphorization was used in the original design. However, due to the backwardness of China’s chemical industry, Mazhif salt was not produced in large quantities, so galvanization was used instead. The cost of galvanizing 15 micrometers is several times lower than that of phosphating (galvanized 15 micrometers per square meter is about 1 yuan, and phosphating is about 5 yuan), and its rust resistance is far better than phosphating. 2) The bearing bushes are used in almost all countries in the world. Due to the scarcity of Soviet tin mines, the price of tin is six times that of nickel. The quality of the copper plating layer is inferior to that of tin plating, and coarse and hard grains are often present in the copper plating layer, directly affecting the surface finish of the bearing after machining (▽▽▽▽_(10)). According to the actual statistics in production, the copper-plated bearing bushes do not reach the surface after the mechanical processing (pulling on the bed)