High melting point metals such as aluminum alloys and magnesium alloys often require the use of cold chamber die-casting machines during die-casting. However, when conducting cold chamber die-casting processes, it is crucial to set and control process parameters reasonably to ensure the quality and production efficiency of die-casting products. The following is a detailed introduction to its process parameters.
1. Injection speed:
Injection rate refers to the rate at which molten metal enters the mold cavity. The appropriate injection speed can ensure the fluidity and temperature control of the metal during the filling process.
Excessive injection speed may lead to turbulent flow and spraying of metal, resulting in problems such as porosity, poor brightness, and casting deformation. Therefore, according to specific process requirements, choose an appropriate injection speed to achieve good casting quality.
2. Injection pressure:
Injection pressure is also one of the important process parameters for cold chamber die-casting machines. It determines the speed and pressure at which molten metal enters the mold cavity. The appropriate injection pressure can ensure sufficient filling of the casting and avoid problems such as defects and porosity. The selection of injection pressure should be adjusted based on factors such as casting shape, wall thickness, mold structure, and metal fluidity.
3. Injection temperature:
Injection temperature refers to the initial temperature of a metal during the injection process. An appropriate injection temperature helps to maintain the fluidity and stability of the metal. It is influenced by factors such as the melting point of the molten metal, the melting temperature range, and the control ability of the equipment. According to the casting requirements and metal properties, select the appropriate injection temperature to obtain high-quality castings.
4. Injection time and holding time:
Injection time refers to the duration of metal injection into the mold, while holding time refers to the time spent maintaining injection pressure after the injection is completed.
The selection of injection time and pressure holding time should take into account factors such as sufficient filling of the casting, solidification shrinkage, and mold structure. Short injection time and pressure holding time may lead to poor casting quality, while prolonged time can affect production efficiency.
5. Lubrication and swelling agents:
The lubrication and swelling agents in the equipment play an important role in the smooth operation and quality control of molds and castings. Lubricants can reduce mold wear and friction, improve mold life and surface quality of castings.
Moisturizing agents can reduce the shrinkage and deformation of castings. Select appropriate lubricants and expansion agents based on specific needs, and apply them at the appropriate location and time.
6. Mold temperature control:
In cold chamber die-casting machines, the control of mold temperature is crucial for the quality of castings and the solidification process. By controlling the heating and cooling system of the mold, the solidification rate, surface quality, and mechanical properties of the casting can be adjusted. Set appropriate mold temperatures according to casting requirements and alloy characteristics to achieve good casting quality.
7. Cooling time:
Cooling time refers to the time taken for the casting to cool and solidify in the mold after injection and pressure holding. An appropriate cooling time can ensure full solidification of the casting and avoid defects and deformation. Set an appropriate cooling time based on the thickness, shape, and alloy characteristics of the casting to achieve better casting quality.
