The answer is Yes, there are some mechanical property differences between Pressure die casting and Gravity die casting. The Pressure die casting parts are stronger than gravity die casting parts. the inside will be more tight with the extra pressure. want to know the details. Let’s dig out today.

difference between gravity die casting and pressure die casting mechanical property

Pressure die casting Meaning

Aluminum alloy pressure casting refers to the process of injecting molten metal into the mold under external forces (excluding gravity). Pressure casting is divided into high pressure die casting and low pressure die casting. 

The molten aluminum is poured into the press chamber, and the mold cavity is filled at high speed through its pressure, and the molten aluminum is solidified under pressure to form aluminum castings.

Pressure die casting parts characteristics

1. The surface finish of the product is good, generally reaching Ra6.3 or even Ra1.6.

2. No heat treatment is allowed.

3. The product has high tightness, high casting strength and surface hardness, but low elongation.

4. The mold cost is high and the service life is short.

5. High production efficiency.

6. Thin-walled parts can be produced with a small machining allowance.

Gravity die casting Meaning

The molten metal is generally poured into the mold through gate manually, and the cavity is filled with the weight of the molten metal, exhausted, cooled, and the mold is opened to obtain the sample. we called it Gravity die Casting. The process flow is generally: molten aluminum smelting, pouring filling, exhausting , Cooling, mold opening, cleaning, heat treatment, processing.

Gravity die casting parts characteristics

  1. The surface finish of the product is not high, and it is easy to be pits after shot blasting.
  1. There are few porosity inside the aluminum casting, which can be heat treated.
  1. The product has low compactness and weaker strength, but high elongation.
  1. The mold cost is low, and the mold has a long service life.
  1. The production efficiency is low, which increases the production cost.
  1. The process is relatively simple and not suitable for the production of thin-walled parts.

When choosing which process to produce the product, the choice is mainly based on the wall thickness of the workpiece. When the wall thickness of the product is thicker than 8mm, die casting will cause a lot of porosity inside the wall, so thicker products can be Manufactured by gravity die casting.

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