Common Problems in Die Castings: Pores And Bubbles

Porosity and bubbles in die castings are common quality issues that can affect the sealing, strength and appearance of the part. Here are some common causes and solutions for blowhole and bubble problems:

1.Gases and bubbles in metallic liquids:
Cause of the problem: There may be gas absorption or moisture absorption in the metal liquid, as well as gas released during the dissolution or cooling process of the metal. These gases cannot be completely discharged during the die casting process and form pores and bubbles.
Solution: Use high-quality metal alloys, treat the metal liquid with vacuum or inert gas to reduce gas content, use appropriate pouring systems and pouring speeds, and optimize die-casting parameters to reduce gas entrapment.

2.Mold surface oxidation or contamination:

Cause of the problem: Oxidation or contaminants on the mold surface may be carried into the die casting as the metal flows into the mold, forming bubbles.
Solution: Clean and maintain the mold regularly, use surface coatings or paints to prevent oxidation, and ensure the mold surface is smooth and clean.

3.The flow of metallic liquid is not smooth:

Cause of the problem: The metal liquid is obstructed or flows unevenly during the filling process, causing gas to be entrained into the die casting.
Solution: Optimize the design of the pouring system, reduce the resistance of the metal liquid during the flow process, increase the pouring port or change the pouring direction to promote the flow of metal.

4.Improper temperature control of metal liquids:

Cause of the problem: The temperature of the metal liquid is too high or too low, which may lead to the formation of bubbles.
Solution: Control the temperature of the metal liquid to ensure that the metal liquid is within an appropriate temperature range to reduce the dissolution and release of gas.

5.Die casting parameters are inappropriate:

Cause of the problem: Incorrect die-casting parameter settings, such as pressure, speed, etc., may cause voids and pores in the metal liquid during the filling process.

Solution: According to the specific die-casting requirements and metal properties, optimize the die-casting parameters to ensure that the metal liquid is filled evenly and stably.

Longhua has extensive experience in the field of designing high-precision molds, which can effectively prevent and reduce cracks in die-casting parts and improve the quality and reliability of die-casting parts.