[China Aluminum Industry Network] Industrial aluminum extrusions pressed into the surface: along the longitudinal section of the profile strip exposed semi-porous, short a few millimeters, length is a few centimeters or longer. The main component of the pores is graphite.
main reason
1.Because the proportion of graphite in the graphite lubricant is too high or the graphite is not completely stirred evenly, there are particles or massive graphite;
2. The smear of graphite lubricant is too close to the shunt or hole of the aluminum extrusion die. When the aluminum alloy profile is extruded, these graphites do not enter the residual pressure, but are pressed into the superficial layer of the product by the high temperature and high pressure metal flow.
Solution
1, the use of high-quality lubricants;
2. When the lubricant is applied, it should be far away from the orifice or hole, and use as little or no lubricant as possible.
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