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           If there are bulges of different sizes or voids formed under the skin on the casting surface of industry aluminium profles, it is generally possible that the fullness of the molten metal in the injection chamber is too low, and the initial injection speed is too high, resulting in gas. .

           It may also be due to the unreasonable mold or poor exhaust in the casting system, resulting in air bubbles. If the smelting temperature is too high, resulting in a relatively high gas content, the melt will not be degassed, this situation will also occur. The temperature of the mold is too high, the mold retention time is not up to the standard, the metal is not sufficient when it is solidified, the strength of the industry aluminium profles is not enough, the mold is opened prematurely, the compressed gas is expanded, and the blowing time after spraying is not enough Long, the surface of the mold is not blown dry, etc. will cause bubbles in the aluminum alloy profile.

           Preventive measures, to adjust the parameters of the die casting process and injection speed, as well as the switching point of the high pressure injection speed, thereby modifying the mold runner to increase the overflow groove and exhaust groove, so that the industry aluminum profles defect area can be reduced The mold temperature, of course, also reduces the pressure of the gas.