Part eight: scratch, extrusion defect analysis and quality control method

Part eight: scratch, extrusion defect analysis and quality control method

Scratch, extrusion defect analysis and quality control method

Scratch causes and solutions in extrusion

Scratch

Because of the contact between the sharp object and the surface aluminum profile, the mechanical damage as line or strip caused by relatively moving is called a scratch.

Or the surface of the extruded product comes into contact with the edges or surfaces of other objects, the line or strip scratch caused by relative sliding or displacement on the surface of the product are also the scratch.

Causes for aluminum profile scratches

1. The tool assembly is not correct, the conveying and work table are not smooth, and there are sharp corners or foreign objects;

2. The mold land with metal particles or the mold land is damaged;

3. There are sand or broken metal scraps in the lubricating oil;

4. Improper operation during the handling process, the hoist is not suitable;

5. The extrusion die is seriously worn;

6. Due to the over temperature of aluminum billets, the die hole is stuck to the aluminum or the die hole working belt is damaged;

7. The graphite, oil and other dirt fall into the extrusion container;

8. The extrusion products move to each other, causing surface scratches; extrusion flow unevenly, causing the profile not flow in a straight line, the scratches between the profiles and the profiles and between the profile and the guides and the workbench.

Solutions for aluminum profile scratch

1.Promptly inspect and polish the die land;

2.Check the product conveying and stacker;

3. Avoid the mechanical impact and scratch during the moving;

4. Carefully operation in the loading and unloading;

5. Inspect and replace unqualified extrusion dies in time;

6. Control the heating temperature of mill finish profile;

7. Ensure that the surface of the extrusion container and mill finish is clean and dry;

8. Control the extrusion speed to ensure uniform speed.

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