Part ten:Twist, bend and wave,extrusion defect analysis and quality control method

Part ten:Twist, bend and wave,extrusion defect analysis and quality control method

Twist, bend and wave,extrusion defect analysis and quality control method

Twist, bend and wave

The phenomenon in which the cross section of the extruded product is angularly deflected in the longitudinal direction is called twisting.

The phenomenon that the product is curved in the longitudinal direction or the blade is not straight is called bending.

The phenomenon of continuous undulations in the longitudinal direction of the article is called wave. 

The main causes of twist, bending and wave:

1. The design of the die hole is not well arranged, or the size distribution of die land is unreasonable;

2, the die hole processing accuracy is poor;

3. No suitable guide and puller

4. Improper die repairing;

5, improper extrusion temperature and speed;

6. The product is not pre-straightened before aging treatment;

7. Uneven cooling during on-line heat treatment. 

Solutions for twist, bending and wave:

1. Improve the mold design and manufacturing level;

2.Install a suitable guide and puller;

3. Adjust the metal flow rate by local lubrication, mold modification and diversion or changing the design of the porthole;

4. Reasonably adjust the extrusion temperature and speed to make the extrusion more uniform;

5. Appropriately reduce the aging treatment temperature or increase the water temperature for solution treatment;

6. Ensure uniform cooling during on-line quenching.

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