机械装配技术标准（Technical standard for mechanical assembly）.docVIP

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机械装配技术标准（Technical standard for mechanical assembly）.doc

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机械装配技术标准（Technical standard for mechanical assembly）

机械装配技术标准（Technical standard for mechanical assembly） Assembly 1.1. general regulations 1.1.1 before assembly, should understand the equipment structure, assembly technical requirements. When the surface of 1.1.2 equipment and parts is corroded, it must be treated with rust. The method of derusting is as follows. Metal surface roughness (m) commonly used rust removal method 50 wheel, steel wire brush, scraper, emery cloth, sand blasting or acid pickling From 50 to 6.3 with non metal scraper, oilstone or size 150 on the cloth with machine oil wipe or pickling derusting From 3.2 to 1.6 with a fine aggregate or particle size 150 ~ 180 on the cloth with machine oil wipe or pickling derusting From 0.8 to 0.2 by 180 or 240 on the size of the mechanical oil mixture with emery cloth wipe, and then use a clean flannel wipe machine oil and fine grinding polishing paste 1.1.3 fittings, surface rust removal and dirt removal, alkaline cleaning solution and emulsion degreasing solution should be used for alkaline cleaning. Alkaline cleaning liquid and emulsion degreasing solution shall comply with the provisions of this specification. Ratio of alkaline cleaning solution Formula (mass percentage) applicable range Sodium hydroxide 0.5 ~ 1 Sodium carbonate 5~10 Sodium silicate 3~4 Water Margin Strong alkaline, can clean mineral oil, vegetable oil and sodium base grease, suitable for general steel parts Sodium hydroxide 1~2 Three sodium phosphate 5~8 Sodium silicate 3~4 Alkaline water, strong, can clean mineral oil, vegetable oil and sodium based grease, suitable for general steel parts Sodium hydroxide 0.5 ~ 1.5 Sodium phosphate 3~7 Sodium carbonate 2~5 Sodium silicate 1~2 Water allowance applies to copper and other alloy parts Three sodium phosphate 5~8 2 ~ 3 sodium dihydrogen phosphate Sodium silicate 5~6 Sodium alkyl benzene phosphate 0.5 ~ 1 Water base is less alkaline, suitable for steel and aluminum alloy parts Emulsion deoiling ratio Name quality ratio (%) kerosene turpentine