Aluminum die casting to solve the casting porosity method introduction
Published on:
2022-09-21
First analyze the cause of the formation of pores, and then take appropriate measures.
First analyze the cause of the formation of pores, and then take appropriate measures.
(1) Select dry, clean alloy material.
(2) Do not overheat the melt temperature under control and degas.
(3) Reasonable selection of casting process parameters, especially the injection speed. Moderate the speed and high speed switching starting point.
(4) Sequential filling helps to expel the cavity gas. Pouring I: 1, and the flow channel has sufficient length. It should be 50 ram, which facilitates the smooth flow of alloy liquid and gas discharge.
The thickness and direction of I:l can be changed and overflow and venting slots can be provided at the hole. The sum of the cross-sectional area of the overflow product is not less than 60% of the sum of the cross-sectional area of the gating part, otherwise the slag removal effect is not good.
(5) Select good performance of paint and spray volume control.
Choose the right die-casting machine
Die-casting machine is the key equipment of die-casting production, its performance objectively determines the quality of die-casting. The correct choice of die-casting machine is essential to ensure product quality, improve production efficiency and reduce production costs. The performance of a die casting machine depends on two aspects.
Sufficient clamping force: prevents the metal melt flow pressure from reaching peak values and prevents the appearance of flying edges and scattered material.
Sufficient injection capacity: to ensure that the die casting process does not result in overheating or large spillage of the mold, and that the machine has sufficient capacity to deliver enough molten metal and fill the cavity as required Speed up in a short time.
Die Casting Mold Runner Design
Because zinc alloys must fill cavities in a short period of time, the design and manufacture of die casting molds and their runner systems is far superior to that of plastic molds.
The runner system directs the metal solution in a certain way to fill the cavity. It plays an important role in the flow direction of the metal fluid, pressure transfer, filling time, venting conditions and mold temperature distribution.
It is also an important factor in determining the quality of the die casting.
The design principle of the die casting mold runner system should be summarized from the gooseneck to the gate to avoid sharp corners, and the runner surface should be smooth to reduce resistance and maintain the flow rate of the liquid zinc alloy.
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