According to the particularity of the industry, each die-casting mold factory has different requirements for materials in processing and production, and the following is a detailed description for you. The parts used in the mold should have high strength, hardness and wear resistance. In order to prevent the mold from breaking due to impact, Dongguan die-casting should also have a certain degree of toughness. Because there will be a relatively large temperature rise during extrusion, it also needs to have a certain degree of thermal fatigue resistance and thermal hardness

In the process of die casting die processing, if the conditions are very bad, problems such as grinding damage, fatigue, fracture and shape change are usually easy to occur. Therefore, the materials for die casting die processing must meet the requirements of all aspects to avoid various problems

1. The requirements for drawing die materials require that the materials of die running parts have excellent resistance to adhesion and adsorption, high wear resistance and hardness, corresponding strength and toughness, and superior cutting treatment characteristics, and the shape change is relatively small during heat treatment

2. Requirements for blanking die materials The materials used for operating parts of blanking die with thin plates should have high wear resistance and hardness. However, for blanking dies with thick plates, in addition to high wear resistance and resistance to pressure yield point, Dongguan die-casting must also have high fracture resistance, high resistance to bending strength and toughness in order to avoid die fracture or blade collapse

3. Requirements for cold extrusion die materials

Die casting dies generally bear a certain impact, vibration, friction, high pressure and tension during processing. Sometimes, they need to be processed at a higher temperature. The environment is very diverse. Therefore, the requirements for manufacturing materials for die casting die processing are very high, and the materials selected in different working environments are also different

Hardware die-casting: the distribution of precipitation pores in aluminum alloy die-casting

Because aluminum alloy has severe oxidation and gas absorption tendency, and directly contacts with furnace gas or external atmosphere during smelting, if the control is slightly improper during smelting, aluminum alloy will easily absorb gas and form pores, most commonly pinholes. Pinholes usually refer to precipitation pores less than 1mm in the casting, which are mostly circular and unevenly distributed on the whole section of the casting, especially in the thick section of the casting and the part with low cooling rate. According to the distribution and shape characteristics of precipitation pores in aluminum alloys, pinholes can be divided into three categories

1. Reticular pinholes: In the macrostructure, pinholes are closely connected to form a network, with a few large holes. It is not convenient to check the number of pinholes per unit area, nor to measure the diameter of pinholes

2. Dot shaped pinholes: the pinholes in the macrostructure are in the form of round dots. The pinholes have clear outlines and are discontinuous with each other. The number of pinholes per square centimeter can be counted and their diameters can be measured. This kind of pinhole is easily distinguished from shrinkage cavity, shrinkage porosity, etc

3. Comprehensive stomata: It is the middle type of punctate pinholes and reticular pinholes. From the perspective of macrostructure, there are many large pinholes, but they are not dots but polygonal

The production practice of aluminum alloy metal die casting has proved that the main gas component of aluminum alloy forming pores due to air suction is hydrogen, and there is no certain rule to follow for its rising, often all or most aluminum alloy die castings in a furnace have pinholes; Materials are no exception. All kinds of aluminum alloys easily produce pinholes