About aluminum alloy pressure casting flaws small knowledge

　　In actual die -casting production, it is not uncommon for waste and sub -products caused by die -casting defects. Due to secondary, how to control and prevent the production of die -casting defects is a problem that the die -casting work has always faced. There are many shortcomings of aluminum alloy pressure castings. In actual production, the defects of die castings are very important in actual production, both from the perspective of technology management and from the perspective of production management. Dimensional defects caused by factors such as mold manufacturing accuracy and wear at work. There are many factors that are simple and easy to judge. There are many factors that affect the level of die -casting machines. There are also indirect factors such as production management and work quality. Bubbles are bubbles formed by direct factors characteristic of the epidermis of casting.

　　Reasons for formation:

　　1. The mold temperature is too high

　　2. The charging speed is too fast, the metal liquid flows into the gas

　　3. The coating is large and the amount of dosage is large. Before the casting, the gas was wrapped on the surface of the casting.

　　4. Poor exhaust

　　5. Development of mold opening

　　6. High temperature of aluminum fluid

　　Prevent method:

　　1. Cooling mold to working temperature

　　2. Reduce the charging speed and avoid vortex of gas

　　3. Choose a coating with a small amount of gas, which is thin and uniform, and the mold is completely volatile.

　　4. Clean up and add exhaust tanks

　　5. Correct the opening time

　　6. Fixed the melting process

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