Aluminum high pressure die casting parts refer to the method that which liquid aluminum alloy flows into the mold cavity from the pressure chamber at a very fast speed under high temperature and high pressure, and forms a casting after cooling.

Aluminum parts are formed under high temperature and high pressure, the molten metal is filled into the mold under high pressure and high speed, and the casting is formed by crystallization and solidification under high pressure. Aluminum parts are easy to produce defects, so how do solve these defects?

1. Cold shut off problem

Properly increase the pouring temperature, control it at 640-680℃ (which can be adjusted according to the product and aluminum), and appropriately increase the mold temperature. Increase the injection-specific pressure and shorten the filling time. During the commissioning of the die casting machine, appropriately increase the speed of punch and increase the cross-sectional area of the inner gate at the same time. Select appropriate alloy to improve the fluidity of liquid metal.

2. Crack problem

Correctly control the alloy composition. Change the casting layout, increase the fillet, increase the demoulding slope, reduce the wall thickness difference, and change or increase the thimble to make the thimble stress evenly. Check whether the mold has dislocation and deformation, and shorten the mold opening or core pulling time.

3. Stomatal problems

Check whether the hydrogen pore release agent is sprayed too much and whether the concentration of the release agent is in the appropriate range. During the commissioning of the die casting machine, select an appropriately slow speed, check whether the exhaust area is large enough, whether it is blocked, and whether the position is located at the last filling place to improve the exhaust.

4. Shrinkage problem

Reduce the material at the thicker position of the product. Locally increase cooling, spray release agent and reduce mold temperature. If the shrinkage cavity is located in the direction of the sprue, a new sprue can be added for direct shrinkage. The extrusion process is adopted, and the extrusion pin is added. When the shrinkage hole is in the semi-solid state, it is forced to squeeze and feed.

5. Deformation problem

Improve casting layout. Adjust the mold opening time. Reasonably set the position and number of jacking rods. Choose a reasonable method to remove the gate. Increase the draft angle to eliminate the position of strain. Check whether the deformation will be caused by surface shot blasting, sandblasting, or careless beating and knocking.

6. Burr problem

Check the clamping force of the machine. Check the clamping condition of the mold and whether the mold is depressed. Check whether the mold material meets the requirements. Check whether the casting pressure is too high during the commissioning of the die casting machine. The melting temperature is controlled at 740-780℃.

7. Mold erosion and cracking

Check the injection ratio. The cross-sectional area of the punch and the inner gate is generally controlled at 13-16 times. If it is too high, increase the width and thickness of the inner gate. Check whether the mold material meets the requirements. Check whether the mold has reached the design life. If so, replace the mold. In addition, special treatment can be made for the position with serious erosion in the local part of the die through the coating process. During the commissioning of the die casting machine, appropriately reduce the high speed of punch.

8. Ripple problem

Improve the filling mode and shorten the filling time.

9. Die sticking problem

Increase the draft angle of the product. Cooling is added to the mold, and spraying water is added locally in the die-casting process to reduce the mold temperature. The ejector rod is added to the die. For sticking the fixed die, it can be considered to add a fixed die ejector rod mechanism, and an inverted buckle can also be added to the moving die.

10. Carbon deposition problem

Reduce the spraying amount of the release agent, increase the mold temperature, select the appropriate release agent, and dilute the release agent with soft water.

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