The anodized film of aluminum has high hardness, good corrosion resistance and abrasion resistance, and has good transparency so that the surface after the anodizing treatment maintains the original metal texture of the aluminum. However, Aluminum Alloy Die Cast Part participates in this very multi-metal material, which is prone to air defects, cold insulation, sand holes and other defects during the surface treatment of aluminum alloy die castings. Due to the second phase generated by the alloying elements and the electrode potential of the aluminum substrate Different, so the anodic oxidation behavior and mechanism of aluminum alloy is much more complicated than pure aluminum. At the same time, in addition to aluminum oxide and anions in solution, the composition of aluminum alloy anodic oxide film will inevitably have some alloying elements in aluminum alloy. A state, an oxide state, or an intermetallic compound state exists. Therefore, the appearance quality of the aluminum alloy die-casting oxidation treatment is poor, and the defect rate is high.
Aluminum Alloy Die Cast Part
Anodizing is an issue with the existing technology of aluminum alloy die casting, but it can be done with a reasonable structure for aluminum alloy die casting products. Generally, a layer of zinc is first plated, then a copper base is plated, and then electroplated. The cost is too high and the yield is low.
Next, as an Aluminum Alloy Die Cast Part Factory, I will tell you about the cause of the strain of the die casting.
The surface of the casting along the direction of the mold is a linear strain mark with a certain depth. The zinc alloy is die-cast. In severe cases, the entire surface is damaged. The molten metal adheres to the surface of the mold, resulting in a lack of material on the casting surface.
The surface of the mold cavity is damaged; there is no slope or too small slope in the direction of the mold; the ejection is unbalanced; the mold is loose; the pouring temperature is too high or too low, the mold temperature is too high, which causes the alloy liquid to adhere; Not good; zinc alloy composition iron content is less than 0.8%; cooling time is too long or too short; poor parallelism of die casting machine.
2. Ways to improve
Repair mold surface damage; Correct the slope, zinc alloy die-casting company, improve the surface finish of the mold; adjust the ejector rod, zinc alloy die-casting processing to balance the ejection force; tighten the mold; control the reasonable pouring temperature and mold temperature 180-500 ℃ Replace the release agent or use anti-scratch paint; adjust the zinc content of the zinc alloy; adjust the cooling time; modify the runner to change the direction of the zinc liquid; adjust the parallelism of the die casting machine.
Die-casting molds sometimes have some problems. What should I do?
(1) Take out the die-casting mold and inspect the damaged part to find out the cause of the damage to avoid recurrence;
(2) Clean up the mold, clean up the parting surface, cavity and ejector of the mold, and re-spray after improving the spraying process;
(3) Re-adjust process parameters, such as injection force, injection speed, pouring temperature, mold temperature, filling time, etc .;
(4) mold repair, for example: increase the gate, exhaust slot, etc .;
(5) Change raw materials, re-purchase high-quality raw materials, and adjust the ratio of returned materials to new materials.
Our company provides Aluminum Die Casting Service, welcome to consult.