Small Information(2)

- May 31, 2019-

Mold temperature

1.In order to obtain high quality castings of consistent quality, the mold temperature must be strictly controlled within the optimum process range. It is necessary to apply a mold cooling heating device to ensure that the mold works in a constant temperature range, aluminum alloy: 200-260 ° C.

2.Aluminum alloy production practice proves that hydrogen is the only gas that can be dissolved in aluminum or aluminum alloy in large quantities, which is the main reason for the formation of pores in aluminum alloy. It is the most harmful gas in aluminum alloy and the most soluble gas in aluminum alloy.

3.Adding scouring agent to aluminum alloy should be proportioned. The scouring agent is generally 0.3% aluminum alloy, and the degassing time is not enough. Method 1: Use seamless steel pipe, insert the scouring agent with nitrogen or argon at 20cm at the bottom of the aluminum liquid. After scouring, nitrogen or argon is blown for another 15-20 minutes (in the case of smelting aluminum alloy 5), sedated for 10-15 minutes, the aluminum slag is removed, and the filter is poured with a filter;

4.All kinds of cast non-ferrous metals have the characteristics of absorbing gas. The alloy liquid is in the process of melting or heat preservation. As the temperature of the alloy increases, the solubility of the absorbed gas increases rapidly. Therefore, in addition to the correct control of the entire smelting casting process, the alloy liquid should be kept warm at a high temperature to avoid overheating of the alloy liquid, and the alloy which is easily absorbing is smelted under the protection of the covering agent. This can avoid the generation of pores and pinholes.

5.In order to reduce the oxidation of aluminum alloy, in addition to selecting the appropriate melting furnace, the holding furnace should be insulated in the production of die-casting, avoid melting, and die-casting production, reduce the stirring as much as possible, keep the liquid oxide film intact, and avoid the alloy liquid. Necessary overheating and minimizing the time of the alloy in the holding furnace