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In addition to the excessively high heating temperature and fast extrusion speed, the causes of cracks in the industrial aluminum profiles extrusion process may also be due to the uneven heating temperature caused by equipment failure, and the sharp changes in the temperature gradient of the industrial aluminum profiles. The design of the porous mold is unreasonable, which is too close to the center or caused by poor metal supplement in the center.

In the process of industrial aluminum profiles extrusion, general cracks can be easily observed, but detailed cracks are more difficult to detect. For the inspection of some fine extrusion cracks in the industrial aluminum profiles extrusion production process, the difference between the smooth surface and the micro crack surface reflection of incident light must be resorted to, so that the existence of extrusion cracks can be observed and judged relatively easily. Admittedly, this requires a certain amount of experience and technology. If you do not grasp it well, it is easy to miss the inspection.

This is one of the important reasons why the cracks in the extrusion products of Industrial aluminum profiles still rank first in the extrusion waste products. Industrial aluminum profiles are more complicated in cross-section, and their surface area is much larger than that of aluminum bars. The probability of cracks is higher than that of bars, but the extrusion cracks of Industrial aluminum profiles always appear first at the sharp corners of the wall plate because of the sharp corners. The frictional and tensile stresses are the largest, and cracks are most likely to occur. There are no cracks at the sharp corners, and no cracks generally appear on the surface of the board. This is an effective method to check the extrusion cracks of industrial aluminum profiles.