Dongguan cast aluminum is a process method that involves pouring molten aluminum into molds, which is then cooled to form the required shape of aluminum parts. The aluminum used in casting is known as casting aluminum alloy.

This is a process method that involves preparing pure aluminum or aluminum alloy ingots in standardized composition proportions, then heating them manually to transform them into liquid or molten aluminum alloy, which is subsequently cast into molds or cavities using specialized techniques, and finally cooled to form the required shape of aluminum components.

The aluminum used in die-casting is known as: Die-Casting Aluminum Alloys. Common methods for die-casting aluminum include: sand casting, pressure casting, low-pressure casting, casting, mold casting, etc.

Key Points

One, Oxide Inclusion Defect Characteristics: Oxide inclusions are predominantly found on the upper surface of castings, particularly in the non-aerated corners of the mold. Fracture surfaces often appear grayish or yellowish, and can be detected through X-ray inspection, during mechanical processing, or during alkaline washing, acid washing, or anodizing.

Causes: 1. Impure furnace charge and excessive use of recycled material. 2. Poor design of the casting system. 3. Incomplete removal of slag in the alloy melt. 4. Improper casting operation leading to inclusion of slag. 5. Inadequate settling time after refining and modification. Prevention Methods: 1. Furnace charge should be sand-blasted, and the amount of recycled material should be appropriately reduced. 2. Improve the casting system design to enhance slag retention. 3. Use appropriate flux to remove slag. 4. Casting should be smooth and slag retention should be emphasized. 5. Allow the alloy melt to settle for a certain period before casting after refining.

Porous and Defect Characteristics: The pores within the three-cast wall are generally circular or elliptical, with a smooth surface and typically have a shiny oxide scale, sometimes appearing oil-yellow. Surface pores and bubbles can be detected through sandblasting, while internal pores and bubbles can be identified through X-ray inspection or mechanical processing. Pores and bubbles appear black on the X-ray film.

Causes: 1. Unstable casting alloy, leading to gas entrapment. 2. Organic impurities (such as coal dust, grass roots, horse manure, etc.) mixed into the mold (core) sand. 3. Poor ventilation in the mold and sand cores. 4. Shrinkage holes on the chilled iron surface. 5. Poor design of the casting system. Preventive Measures: 1. Proper control of the pouring speed to avoid gas entrapment. 2. Avoid mixing organic impurities in the mold (core) sand to reduce the gas emission of the molding material. 3. Improve the exhaust ability of the (core) sand. 4. Select and handle chilled iron correctly. 5. Improve the design of the casting system.