Does the metal get hot during the die casting process? It all depends on the metal you use and how serious you are in compliance with die casting standards in terms of temperature. Is the die temperature important? Absolutely. If you want to avoid die casting defects and other problems, die casting temperature control is a practical issue.
It is important to understand the difference between die casting metal and temperature, and the consequences of poor temperature control during die casting.
General influence of temperature in die casting
Generally, as the temperature increases, the tensile strength and yield strength of die-cast alloys decrease. If you need parts with high tensile strength, remember this fact. In addition, ductility increases with increasing temperature, but its change depends on the type of die-cast alloy. For example, aluminum is not as ductile as zinc, but the temperature of aluminum must be higher in the process.
Thermal factors of die casting
The thermal factor of die casting is the temperature of the alloy used for casting, the temperature of the die itself and the temperature of the die casting machine. For all high-quality parts, all these factors must be kept within the optimum temperature range. If the temperature of the molten metal is too high for the mold, the mold steel may be subjected to premature thermal inspection, which may damage the mold. If the mold temperature is too cold, when the metal flows into the mold, the temperature of the metal may drop too quickly, resulting in defects-especially large porosity or deviation of the casting surface.
Temperature precautions for die casting
To avoid strain in the mold, you want the alloy to be 50 to 70 degrees Fahrenheit higher than the initial crystallization temperature. The mold itself needs to be maintained at about one-third of the alloy temperature. The correct temperature of the casting chamber is a complex calculation determined by the casting engineer.
The effect of temperature on various die-cast metals
So how does temperature affect the different metals used in die casting? Here are some useful examples:
Aluminum is one of the most popular choices for metal die castings. It is light, durable and has good corrosion resistance. The most popular die-cast aluminum alloys are 360, 380 and 413.
For example, for Aluminium 380, the tensile strength at 75 degrees is 48 and the yield strength is 24. When it reaches 212 degrees, its tensile strength is 45 KSI (kilopascals per square inch), while the yield strength remains unchanged at 24. The yield strength of aluminum 390 ranges from 41 KSI to 18 KSI at 500 degrees.
Zinc is another very popular die casting alloy. Some common and most popular zinc alloys include Zamak 3, 5, and 7.
For these alloys, the average KSI produced at 75 degrees is 40 KSI, while the average KSI produced at 275 degrees is as low as 10. The yield strength of other zinc alloys decreases with increasing temperature.
Temperature control of die casting
In die casting, we attach great importance to temperature control during die casting. We mainly use aluminum die castings and have extensive experience in keeping our materials and casting equipment at the optimum temperature for this type of casting. We also have the most advanced equipment, such as Mokon hot oil device, which can maintain the mold temperature during die casting.
In addition, we have a thermal control device on the die-casting machine to maintain the proper oil temperature, and on the die-casting machine, the holding furnace maintains the proper metal temperature. Our die-casting machine unit is designed to help us, together with a team of metalworking engineers who are proficient in critical temperature range and temperature control, maintain extremely precise temperature control throughout the die-casting environment.
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