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The Characteristics of Aluminum Cold Forging and the Lubrication Method Used in the Process

1. Technical characteristics of aluminum cold forging

Aluminum cold forging refers to the forging extrusion of the billet at room temperature. The advantage is that the surface roughness of the product is low, and the strength of the product is also improved due to the strengthening effect of deformation. The disadvantage is that due to the large deformation resistance, the energy consumption of the equipment is large, the load capacity of the equipment is high, and the pressure between the mold and the blank is high, the friction force is large, and the mold wear is serious.

Under certain conditions, improving lubrication conditions is an economical and fast-acting means. The main forged metal products functions of aluminum cold forging lubricants are to reduce the friction between the blank and the mold; reduce the wear of the mold, improve the service life of the mold; and improve the quality of the product.

2. Lubrication technology used in aluminum cold forging

For aluminum cold forging, the most successful lubricating method is to carry out phosphating-saponification treatment with metal forging tools on the surface of the billet. The so-called "phosphating" is to chemically generate zinc phosphate and iron phosphate porous films on the surface of metal materials. The thickness of the film is generally 10 to 25 μm, and its friction coefficient is also very low.

The phosphating film is firmly combined with the steel surface, has a certain plasticity, and can deform together with the metal to a certain extent. This porous film can store lubricants, and can isolate the blank from the mold during forging. And reduce the friction between the deformed metal and the mold. The so-called "saponification" is a lubrication treatment method in which fatty acid soaps are used as lubricants to chemically react with zinc phosphate in the phosphating layer to form zinc stearate.

During forging, apply lubricant on the surface of the treated blank, for example: after phosphating the surface of carbon steel cold forgings, use saponification liquid as lubricant; after oxalate treatment of stainless steel cold forgings, use lubricant composed of 85% chlorinated paraffin and 15% molybdenum disulfide; after passivation of brass parts, soybean oil or rapeseed oil is used as lubricant during cold forging; pure aluminum cold forging is generally lubricated with zinc stearate; After oxidation treatment, soybean oil, rapeseed oil or castor oil is used as a lubricant during cold forging.

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