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Typical defects and causes of aluminum alloy profiles

May 9,2019.
1. Aluminum alloy profiles bending and twisting, wave Due to the unreasonable design of the die hole, the extrusion speed is too fast, the die hole lubrication is not proper, the guide path is not suitable or the guide is not installed.

2. Bubbles and peeling due to the inner diameter of the extrusion barrel is excessively worn, the gap between the pressing pad and the barrel is too large; the extrusion tube and the pressing pad are adhered to the oily sewage; the surface of the ingot has pores, blisters, oil stains and the surface of the ingot Too rough; the temperature of the extrusion tube and the temperature of the ingot are too high, the filling is too fast; the mold is greased during extrusion.

3. Extrusion cracks Because the temperature of the extruded ingot is too high, the extrusion speed is too fast; the ingot blank is not well processed; the mold design is unreasonable, resulting in excessive difference between the center and edge velocity.

4. Pitting or pockmarks Because the temperature of the barrel and the ingot is too high, the extrusion speed is too fast or uneven; the mold work belt is stuck with metal, not smooth; the mold table has insufficient hardness or the inner width of the working belt; Caused by long reasons.

5. Scratches and ribs Because the mold work has defects or ribs; the mold empty knife has sharp edges and is not smooth; the work surface has foreign matter, is not clean; the hard inclusions in the ingot are blocked in the die hole and the like.

6. Unqualified size Due to wrong mold design or manufacturing defects; improper mold repair; excessive temperature rise of the ingot during extrusion, the extrusion speed changes too much; the length calculation of the ingot is not accurate and not enough length.

7. Layering Due to oil stains and dust on the surface of the ingot, the surface quality of the ingot is not good, and there is a large segregation tumor; residual material remains on the surface of the mold; the ingot itself has delamination, bubbles and the like.

8. Retraction Because the extrusion residue is too short, the extrusion gasket is oiled or not clean, the surface of the ingot is not clean, the length of the product is not enough, and the extrusion speed is suddenly increased when the extrusion is finished.

9. Unsatisfactory performance Because the extrusion temperature is too low, the profile does not reach the quenching temperature; the artificial aging system is not suitable; the instrument is out of control, the furnace temperature is too high or too low; the ingot blank is uneven, and the cooling air volume is insufficient.

10. Extrusion of horizontal stripes Due to the unreasonable design of the mold, the working belts of the same part are not equal in length; the extrusion speed is improperly controlled; the extruder is not running smoothly.
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