2020-07-20

Heat Treatment Technology Characteristics Of Aluminum High Pressure Rapid Die Casting

Aluminum, a silver-white light metal, has good ductility. The content of aluminum in the earth's crust is second only to oxygen and silicon. It is an important metal material in industrial production. Because of its low melting point and good ductility, it has become the most frequently used metal material in the die casting industry. The fastest route for high-pressure die casting is to complete the molten metal component. It can be removed by injecting the molten metal into a hard steel mold, tool, and letting it cool and solidify under pressure. This process provides an accurate, fast, and low-cost production method.

Aluminum is a suitable metal alloy for rapid die casting. Aluminum is lightweight, has high toughness, plasticity, good dimensional stability, and can realize complex shapes and thin-walled parts. Aluminum does not absorb dust and corrosion resistance, and has good electronic properties and excellent thermal characteristics. Because it is a good conductor of heat, it can retain heat and maintain a good shape.

Heat treatment of high pressure die castings
A heat treatment method that can be used can significantly improve the properties of these aluminum alloys suitable for age hardening. Through heat treatment, the tensile properties, fatigue resistance, fracture resistance and thermal conductivity of aluminum alloys will be improved. High-pressure casting is the most cost-effective process technology for mass production of complex aluminum alloy parts close to the final shape. The heat treatment method provides an idea improvement of tensile mechanical properties for high pressure die castings, and strengthens other material properties.

This new heat treatment process technology is easy to adopt on existing processing equipment such as continuous belt charging furnaces and specialized for rapid fluidization furnace systems. The cost of each high-pressure die-casting part has the potential to be significantly reduced. They all have a rapid strengthening mechanism and have cost and energy advantages in processing.

Improved tensile strength properties. Traditional solution treatment. Aluminum alloy rapid die casting expand pores and cause unacceptable surface pores, resulting in distortion and lower mechanical properties.



Best   steps for alloy heat treatment

Alloy type

Optimal solution handling

Quenched

T6 tempering aging

T4 tempering aging

All alloys

480-505 degrees Celsius,   pay attention to hot or cold water

16-24 hours at 150 degrees   Celsius

720 degrees Celsius

It should be more than 10   minutes at 420 degrees Celsius and maximum temperature


Please note: heat treatment should not be used as a remedy for poor quality castings with severe casting defects. In addition to T4 and T6 tempering, another option is T7 tempering, with an average temperature of 180 degrees Celsius for 6 hours or 200 degrees Celsius 2 ~ 4 For small hours, this state may increase the best thermal stability under temperature conditions, but the tensile properties will decrease compared to T6 tempering.

Another alternative is T64 tempering. In this state, the alloy will have some T6 tempering conditions. Compared with the T6 tempering peak, the peak hardness and strength properties are slightly reduced, but the fracture resistance is generally much higher.

In general, the tensile properties and hardness of high-pressure die-cast aluminum alloys are linearly related, but for many products this is impossible and not cost-effective. Castings are usually used to process tensile test specimens, and it is more appropriate to use hardness as a means of testing performance.

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