Plastic Parts
Six factors affecting the quality of die castings
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Pressure forging is a process in which a liquid or semi-solid metal or alloy, or a liquid metal or alloy containing a reinforcement phase, is filled into the cavity of the die-casting mold at a high speed under high pressure, and the metal or alloy is under pressure The forging method of castings caused by melting, how many reasons affect the quality of die castings:3. The quality of the die-casting parts of the die-casting machine depends to a large extent on the quality of the injection performance of the die-casting machine. The die-casting machine is the crux of the die-casting production. The precise selection of the die-casting machine improves the quality of the product, reduces the production cost, and ensures the production. Safety is extremely important. To accurately select the die-casting machine, we should start from the product and comprehensively consider the die-casting characteristics of the alloy and the specific structure of the die-casting, and combine the characteristics of the hot-chamber die-casting machine and the cold-chamber die-casting machine to scientifically and rationally select the practical die-casting machine. It is important to lose high-quality die castings.
2. Mold forming is a decisive factor for the quality casting system of a die-casting part. As a system, there are feed and gas discharge slag links. Many factors are responsible for the purpose of allowing alloy liquid to enter the cavity in a suitable flow state. At the same time, it can discharge the gas in the system to the maximum limit. The so-called suitable flow state is that there is no collision of liquid flow, the gas is entrained, and the velocity of the entrapped gas is stable. The inlet bias and the distribution method of the gate have an important influence on the exhaust. It is important to ensure that the liquid flow is filled along the type wall and the favorable exhaust gas distribution method considers which distribution can be more orderly and does not hold back.
4. Mold temperature The mold temperature affects the performance of the alloy liquid state and the three-stage injection of the die-casting machine, which affects the quality of the die-casting parts. During the filling process, the mold has a relatively good time and filling state for the temperature and viscosity of the metal liquid flow. Big influence. The stability of the mold temperature causes the mold to crack at the late stage and affect the surface quality of the die casting. The mold temperature affects the melting and shrinkage of the die casting. When the temperature is uneven and unstable, the change in the size of the die casting will reduce the accuracy level of the size.
6. The release agent is not only related to whether the casting can be smoothly released from the cavity, but also has a great influence on the surface and internal quality of the production rhythm of the casting. The quality of the release agent has an inseparable influence on the surface treatment quality of the product. .
1. Mould design Mould design is the most important step that affects the quality of die-casting parts. According to the structural shape of the product, a reasonable ranking and exhaust are designed. The design of the mold is closely related to all the following five elements.
5. Die-casting process parameters are in die-casting production. Die-casting process parameters are the key factors that affect the quality of die-casting parts, so that various process parameters are satisfactory for die-casting production. There are many die-casting process parameters that have a large impact on porosity. There are two-point runners The import bias and dispersion method are important for the smooth discharge of the orderly filling. This is related to the length of the first-stage injection (may be called the exhaust stroke) and the speed. If the injection is early (referring to (Before the melt enters the sprue) Insufficient exhaust of the cavity of the pressure chamber will cause a delay of the air convection and a dissatisfaction of cold partition.
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