Die casting material requirements
Material requirements:
1) It has excellent anti-stick adsorption properties;
2) with high wear resistance;
3) Higher hardness;
4) Corresponding robust features;
5) The comparative advantage of cutting characteristics;

Die-casting aluminum alloy die-casting parts must pay attention to the use of substitutes in the case of high pressure. Obtained from mold material, mold design, processing and heat treatment, the service life of die-casting parts, if necessary, how to improve the service life of the mold can be achieved:
1. High-quality selection of die-casting mold materials;
2. It is necessary to design reasonable mold wall thickness and mold size;
3. Pay attention to roughing stress tempering;
4, the correct use of heat treatment, the quenching speed is fast enough;

There will be some deficiencies in the casting process of aluminum die castings. And what are the reasons for these deficiencies?
Aluminum die castings often suffer from insufficient casting. The reason is that the heat conduction of the metal mold is too fast, and the melting point of aluminum is low, which causes the aluminum liquid to cool in advance before filling the cavity during the flow. In order to avoid insufficient casting of aluminum castings, the following problems should be paid attention to:
1. Increase the casting temperature;
2. Carry out necessary heating and heat preservation for the mold, or spray heat preservation paint inside the mold;

A die-casting die is a tool for casting metal parts, a tool that completes the die-casting process on a dedicated die-casting die forging machine. The basic process of die casting is: the molten metal is first cast at low speed or high speed and filled into the cavity of the mold. The mold has a movable cavity surface. It is forged with the cooling process of the molten metal, which not only eliminates the shrinkage of the blank Loose defects also make the internal structure of the blank reach the broken grains in the forged state. The comprehensive mechanical properties of the blank are significantly improved.

Die-casting aluminum alloy die-casting parts must pay attention to the use of substitutes in the case of high pressure. Obtained from mold material, mold design, processing and heat treatment, the service life of die-casting parts, if necessary, how to improve the service life of the mold can be achieved:
1. High-quality selection of die-casting mold materials;
2. It is necessary to design reasonable mold wall thickness and mold size;
3. Pay attention to roughing stress tempering;
4, the correct use of heat treatment, the quenching speed is fast enough;
5. Thoroughly polish and remove the EDM harassment quality layer;

The control of the surface temperature of the die-casting mold is very important for the production of high-quality die-casting parts. Uneven or inappropriate die-casting mold temperature will also lead to dimensional instability of the casting, and deformation of the casting during the production process, resulting in defects such as thermal stress, mold sticking, surface depression, internal shrinkage cavities, and thermal bubbles. When the mold temperature difference is large, the variables in the production cycle, such as filling time, cooling time and spraying time, have different degrees of influence.
1). Cold streaks:
Reason: The temperature at the front of the molten soup is too low, and there are traces when they overlap.

Die-casting die is a method of casting liquid die forging, a process completed on a dedicated die-casting die forging machine.
Its basic process is: the molten metal is first cast at low speed or high speed and filled into the cavity of the mold. The mold has a movable cavity surface. It is pressurized and forged with the cooling process of the molten metal, which not only eliminates the shrinkage of the blank. Loose defects also make the internal structure of the blank reach the broken grains in the forged state. The comprehensive mechanical properties of the blank are significantly improved.

The zinc alloy material is heated and melted (aluminum melting point is 660.4 ℃), injected into the mold cavity under high pressure in a liquid state, and the top part of the mold is opened in a short time. In order to ensure the smooth demoulding of the product, a release agent must be sprayed on the surface of the mold cavity before injection.
So what conditions should the aluminum alloy die-casting release agent meet? The following is an analysis of its requirements.
Emulsion. Choose a suitable emulsifier to emulsify silicone oil to prevent carbonization at high temperature. To keep the product and cavity surface clean.
Oil. As an effective material for metal-to-metal isolation, silicone oils are ideal. The silicone oil must be resistant to high temperatures and not affect post-processing properties (eg, coating aluminum products).

Aluminum die-casting should be annealed regularly or after a certain number of times of die-casting, and the surface of the forming part should be polished:
1. The alloy should not be overheated;
2. Increase the mold temperature and reduce the pouring temperature;
3. Strictly control the alloy composition within the allowable range;
4, the proportion of alloy materials should pay attention to the impurity content not exceeding the starting point requirements;
5. Adjust the mold opening time 3 to make the push rod evenly stressed;
6. Change the unevenness of wall thickness;