Part fourteen: metal and nonmetal pressing in analysis and quality control method

Part fourteen: metal and nonmetal pressing in analysis and quality control method

Part fourteen: metal and nonmetal pressing in analysis and quality control method

During the extrusion production process, the metal scraps are pressed into the surface of the product, which is called metal pressing in.

The main causes of metal pressing in:

1. Some problem at the end of aluminum profile

2. There is metal on the inner surface of aluminum profile or metal inclusion and other dirt in the lubricating oil;

3. The extrusion press container is not cleaned, and there is other metal inclusion in it;

4. Other metal foreign objects are melted into the ingot;

5. There is slag inclusion in aluminum extrusion.

The solution for metal pressing in

1. Remove the burrs on mill finish aluminum profile;

2. Ensure that the surface of aluminum profile and the inside of the lubricant are clean and dry;

3. Clean up the metal inclusion in the mold and extrusion container;

4. Use high-quality mill finish aluminum extrusion.

Foreign matter such as graphite is pressed into the inner and outer surfaces of the aluminum extruded product, which is called non-metal pressing in.

After the foreign matter is scraped off, the inner surface of aluminum extrusion will show depressions of different sizes, which will destroy the continuity of the aluminum extrusion surface.

The main cause of non-metallic pressing in

1. The graphite particle size is coarse or agglomerated, contains moisture or oil, and the stirring is uneven;

2. The flash point of cylinder oil is low;

3. The Improper ratio of cylinder oil and graphite, too much graphite.

The solution for non-metallic pressing in:

1. Use qualified graphite and keep it dry;

2. Filter and use qualified lubricating oil;

3. Control the ratio of lubricating oil and graphite.

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