What is aluminum alloy die casting?

Aluminum alloy die casting is similar to die casting, except for die casting, metal is injected into the mold under the high pressure of 10-210mpa (1450-30500) psi. The results are in a more uniform part, and the surface finish and dimension precision are good, and the casting size is 0.2%. For many parts, it can be completely eliminated after machining, or it may need very light machining to make the size of the size. Die casting, aluminum die casting can use cold chamber or hot chamber process.

1. In the process of cold chamber, molten metal is easy to be into the cold chamber of each rod. There is exposure time to reduce the melt to the plunger wall or plunger. It is particularly useful for metals such as aluminum, copper (and their alloys), alloys that are easily associated with iron at higher temperatures.

2. In 1 thermal process is connected to the mold cavity, and the pressure chamber is immersed in molten metal. The air inlet of the pressurized cylinder is found to move the plunger to the open (non pressurized) position. This allows the new charge of molten metal to fill the cavity, which can fill the cavity faster than the cold chamber process. In the hot chamber process, metals such as tin, zinc and lead have low melting point and high fluidity. It is often difficult for alloys and steels to melt at their melting temperature. Die casting, aluminum die casting, aluminum casting, adc-12 die casting part, motorcycle parts, aluminum pressure die casting

Types of zinc alloy die casting

Traditional die-casting zinc alloys include No. 2, 3, 4, 5 and 7 alloys. At present, No. 3 zinc alloy is widely used. In the 1970s, high aluminum zinc base alloys za-8, ZA-12 and ZA-27 were developed.

It is applied to castings with low mechanical strength requirements, such as toys, lamps, decorations and some electrical parts.

It is applied to castings with certain requirements for mechanical strength, such as auto parts, electromechanical parts, mechanical parts and electrical components.

It is applied to mechanical parts with special requirements for mechanical properties, high requirements for hardness, good wear resistance and general requirements for dimensional accuracy.

Die casting die belongs to a process method of casting liquid die forging and completed on a special die casting die forging machine. For die casting, three elements of die casting material, die casting machine and die are indispensable. In the use and production process, in order to improve production efficiency, brand quality and high economic benefits, and prolong the service life of the die-casting die, the use and maintenance of the die-casting die is very important.

Correct use and maintenance of die casting die:

1. Try to reduce the rapid cooling and heating of the mold, and try to produce continuously. Under the cold mold state, high-speed injection is strictly prohibited.

In the process of die-casting, the die-casting die has been in the reciprocating fatigue state of heat expansion and cold contraction. The temperature of the die cavity basically changes back and forth from 160 degrees to 350 degrees. The die is rapidly cold and hot, and the continuous heat expansion and cold contraction cause die fatigue damage. When the production starts under the cold die state, the die temperature starts to rise from low temperature, the temperature difference increases, the die expansion and contraction increases, and the die fatigue increases accordingly, which will accelerate the die damage and shorten the die life. Therefore, during die casting production, continuous production should be carried out as far as possible to minimize the rapid cooling and heating of the die, so as to prolong the service life of the die.

In addition, in the cold mold state, the mold does not reach the temperature during normal production, and the gap between each part of the mold is relatively large. In this case, it is strictly prohibited to start high-speed injection and pressurization. Otherwise, the gap parts of the die, including the sliding block, ejector rod hole, etc., are easy to jump into the aluminum skin, so as to damage the die and affect the service life of the die.

2. Try to reduce the injection speed, specific pressure and die impact.

In die casting production, the injection speed not only affects the filling speed and injection inner gate speed, but also increases the impact peak value when the injection speed is high. Therefore, the injection speed is high, the injection inner gate speed is fast, the scouring to the mold will be intensified, the impact peak value will be increased, the impact force borne by the mold will also be increased, and the service life of the mold will be greatly reduced. Therefore, when we adjust the die-casting process and ensure the product quality, it is very important to reduce the injection speed as far as possible to improve the service life of the die and the economic benefits of the die-casting enterprise. At present, the advanced die casting machine is equipped with injection braking device, which is very beneficial to reduce the impact peak, reduce the impact force borne by the die and improve the service life of the die.