Aluminum alloy die-casting may encounter various common problems during the production process. Here are some common problems and their solutions:

Stomata (bubbles):

Problem description: Porosity appears on the surface or inside the aluminum alloy casting, affecting the appearance and performance.

solution:

Avoid gas trapping and accumulation by optimizing mold design and process parameters.

Use a suitable pouring system to increase metal filling speed and reduce gas inclusions.

Add an appropriate amount of gas eliminator or improve the degassing treatment of metal.

Thermal cracks:

Problem Description: Cracks appear in aluminum alloy castings during the cooling process, affecting their mechanical properties.

solution:

Control the casting temperature and cooling rate to avoid thermal stress caused by rapid cooling.

Use preheated molds or preheated metal materials to reduce thermal stress.

Optimize the metal composition and alloy ratio to reduce the tendency of metal to crack.

Cold cracking (cold cracking):

Problem Description: Cracks appear in aluminum alloy castings after cooling, usually in thin-walled parts or corners.

solution:

Design appropriate relaxation angles and edge chamfers to reduce stress concentration.

Use appropriate annealing or aging treatments to reduce tissue stress.

Optimize mold design to reduce stress caused by uneven mold shrinkage.

Size deviation:

Problem description: The dimensions of aluminum alloy castings do not match the design requirements.

solution:

Control the metal pouring temperature and cooling rate to reduce metal shrinkage.

Use appropriate mold materials and cooling systems to reduce the impact of mold deformation on dimensions.

Regularly inspect and maintain molds to maintain mold accuracy and stability.

Surface defects:

Problem description: Defects such as oxidation, pores or inclusions appear on the surface of aluminum alloy castings.

solution:

Optimize mold surface treatment and spray coating to improve surface finish and oxidation resistance.

Control pouring speed and temperature to reduce metal oxidation and gas inclusions.

Strengthen the mold ventilation and cooling system to reduce the temperature gradient on the mold surface and avoid the formation of surface defects.

The above are some common aluminum alloy die-casting problems and their solutions. In actual production, comprehensive analysis and processing are required based on specific circumstances.