The application of the mold temperature machine in the die casting process is briefly introduced: The mold temperature machine must reach the required mold temperature. The die-casting factory technicians often use LPG guns, followed by radiant heaters or plug-in electric heating tubes, but the effect is not satisfactory and the mold temperature is not uniform. However, the use of radiant heaters is more flexible, less damage to the mold, but less efficient; plug-in electric heating tubes are only suitable for long-term heating, and the application range is limited. In addition, the use of low-speed injection method - that is, reducing the primary injection speed, directly heating the mold with molten metal is also a very common method, but this method has a bad influence on the life of the mold, and is not suitable for expensive precision molds. Since the injection is in an instantaneous phase, the temperature of the melt will invade the surface of the cavity, and the depth of penetration is twice that of the mold temperature of the casting. During periods of intense heat intrusion, the high temperature state of the cavity surface will cause high stress on the surface of the cavity, and the chance of occurrence of microcracking will multiply. The ideal heating method for the mold temperature machine Zui should be hot oil heating. The hot oil is continuously passed through the inner tube of the mold to heat the mold from the inside to make the mold suitable for production. Since the heat transfer oil can not only heat, but also cool like water, the function is like a heat exchanger, keeping the mold temperature within a certain range, and maintaining the mold temperature properly even if the production is interrupted.
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After the alloy melt is pressed into the cavity, it solidifies and forms due to the loss of heat. If the heat transfer rate is too fast, the cold streaks may be generated in the casting. Conversely, a slow heat transfer rate increases the molding cycle of the casting and reduces productivity. The control of the mold surface temperature is very important for the production of high quality die castings. The temperature of the mold affects the flow of molten metal on the surface of the cavity, especially thin-walled parts with long flow paths.
In order to fill the cavity before the solidification of the molten metal, in addition to the design to shorten the filling time, it is also possible to increase the gate speed (but it is easy to generate turbulence) and to increase the mold temperature. In addition, castings with large areas and extremely high surface requirements also require a high and stable mold surface temperature to reduce cold lines and surface defects.
Uneven or inappropriate mold temperature can also lead to unstable casting dimensions, which can cause deformation of the casting during the production process, resulting in defects such as heat pressure, sticking mold, surface depression, shrinkage cavities and thermal bubbles. When the difference in mold temperature is large, the variables in the production cycle, such as filling time, cooling time and spraying time, have different effects. In addition, the life of the mold is also caused by the impact of overheating and overheating, which leads to problems such as hot cracking of expensive steel.
Appropriate surface temperature of the mold temperature machine
Appropriate mold surface temperature distribution must be determined by the shape of the product, such as thickness, cross-section thickness and other surface requirements, as well as the production cycle. The general appropriate temperature is:
Alloy mold surface temperature is about 180-270 °C
Magnesium alloy 180-300 ° C
Zinc alloy 100-200 ° C
