Die casting mold temperature is generally between 150-300 degrees, it is suitable casting stability temperature range.
Mold temperature generally is the surface temperature of the mold, and its standard measurement should be about 1/3 of the pouring temperature of the alloy liquid.
But the temperature of die casting molds varies depending on the type of alloy used.
Die casting temperature control is a serious issue.
When it comes to die casting, as temperatures increase the tensile and yield strengths of the alloy decrease.
Ductility also increases as the temperature increases but differs based on the type of alloy being cast.
The proper temperature is crucial for both the die and the metal to be cast.
The metal being cast needs to be heated correctly to ensure proper flow and fill of the mold.
If the temperature of the molten metal is too hot for the mold, it could damage the mold.
If the temperature of the mold is too cold, the metal will cool too quickly as it flows into the mold and will cause defects.
Die casting mold temperature of four alloys
- Aluminum Alloys
- Magnesium Alloys
- Zinc Alloys
- Copper Alloys
Aluminum Alloys
- Mold temperatures are typically between 200°C and 250°C (392°F to 482°F).
- Maintaining the mold within this range ensures proper metal flow and reduces defects like porosity.
Magnesium Alloys
- Magnesium has lower melting points than aluminum, so mold temperatures are usually kept between 150°C and 200°C (302°F to 392°F).
Zinc Alloys
- Zinc alloys require lower mold temperatures, often between 90°C and 150°C (194°F to 302°F), due to their relatively low melting points and high fluidity.
Copper Alloys
- Copper alloys demand higher mold temperatures, typically around 280°C to 350°C (572°F to 752°F), to ensure proper casting.
The influence of different die casting molds on the quality of die castings
- Below 130 degrees
- 130-150 degrees
- 150-300 degrees
- Higher than 300 degrees
Below 130 degrees
When the mold temperature is lower than 130 degrees, almost all of the castings will appear undercasting, fracture, cold segregation, flow pattern and other defects, due to the casting temperature is too low, the yield is almost zero.
130-150 degrees
When the mold temperature between 130-150 degrees, because the mold temperature is close to the ideal temperature, although the casting can be molded.
However, the quality is not stable most of the casting surface with flow patterns, cold segregation phenomenon.
150-300 degrees
Mold temperature between 150-300 degrees, it’s a temperature range suitable for casting stability.
Higher than 300 degrees
Higher than 300 degrees casting temperature is too high, easy to produce surface bubbles, sticky, shrinkage, fusion and other defects.
Why Does Mold Temperature Control Matter in High-Pressure Die Casting?
The root cause is often an unstable mold temperature, turning your reliable production process into a game of chance.
Proper temperature control is critical because it directly influences metal flow, solidification rate, and overall part quality.
A stable thermal process prevents surface defects and internal porosity, reduces cycle time, and protects the mold from premature failure due to thermal shock.
The temperature of the mold is the very first thing the molten aluminum experiences when it enters the cavity. Its condition dictates everything that happens next.
If the mold is too cold, the metal freezes before it can fill the part completely, leading to defects like misruns or flow lines.
If it’s too hot, the aluminum can start to weld itself to the tool steel, a defect we call soldering, which damages the mold surface.
More importantly, temperature stability is the foundation of a repeatable process.
You can’t achieve consistent part quality if your mold temperature is fluctuating with every shot.
It directly impacts:
- Part Quality: Prevents surface defects, ensures proper filling, and controls solidification to minimize shrinkage porosity.
- Cycle Time: A thermally stable mold allows for a fast, consistent cycle time. Uncontrolled hot spots will force you to slow down the process to avoid defects.
- Tool Life: Drastic temperature swings create thermal shock, which is the primary cause of heat checking (fine cracks) and premature tool failure.
Factors affecting the temperature of die-casting molds
- Characteristics of alloy materials
- Mold material
- Coolant system
- Mold design
Characteristics of alloy materials
Different metal alloys have different melting points.
Which determines the range of temperatures required when pouring metal, thus affecting the working temperature of the mold.
Mold material
The thermal conductivity of the mold material (e.g. tool steel or special alloys) affects the distribution and stability of the mold temperature.
Coolant system
The cooling waterways or cooling medium in the mold (e.g., water, oil, or gas) can have a direct effect on the temperature control of the mold.
Mold design
The complexity of the mold cavity, the wall thickness, and the pouring system (e.g., gate and overflow channel design) all affect the distribution and transfer of heat, thus changing the temperature behavior of the mold.
Haichen die casting mold
Haichen is a factory specializing in the production of die-casting machines including cold chamber die casting machine and hot chamber die casting machine.
- High Precision:Die casting molds designed for tight tolerances and high-quality surface finishes.
- Customizable:Tailored for specific industries, allowing for unique designs depending on product requirements.
- Durability:Made from robust materials, such as H13 tool steel or other heat-resistant alloys, to withstand repeated high-pressure casting cycles.
- Support for Various Alloys:Capable of casting aluminum, zinc, or magnesium alloys, depending on the application.
- The die casting mold temperature ranges are based on a combination of alloy properties, mold structure and casting conditions.
- Controlling the mold temperature is crucial to ensuring the quality and longevity of both the mold and the finished cast part.
