Aluminum alloy gravity casting, high-pressure casting, low-pressure casting process introduction awareness

Introduction to Gravity Casting:

Gravity casting refers to the aluminum liquid in the earth's gravity rely on gravity injection casting process. Broad gravity casting gravity casting is divided into sand casting, metal type (steel mold) casting, disappearing mold casting. ; Narrow gravity casting refers to the metal type casting. Metal casting is divided into upright hand casting, tilted casting is now most commonly used metal mold (steel mold) casting. The mold is made of heat-resistant alloy steel, casting aluminum castings strength, size, appearance are higher than other casting processes. Aluminum liquid for gravity casting is generally poured manually into the gate, relying on the self-weight of the metal liquid to fill the cavity, exhaust, cool, and open the mold to obtain the sample. The process is generally: aluminum liquid melting, pouring, exhausting, cooling, mold opening, cleaning, heat treatment, processing. -Ningbo Hexin

Aluminum gravity castings are characterized by:

• 1, the product surface finish is not high, easy to produce pits after blasting.
• 2. Aluminum castings have fewer internal holes and can be heat-treated.
• 3、Products of low densification, strength is slightly worse, but high elongation.
• 4、Low mold cost and long service life.
• 5. Low productivity increases production costs.
• 6, the process is simple, not suitable for the production of thin-walled parts.
• 7. Low flowability special aluminum alloy can be used.
• When the product choose what kind of process production, mainly according to the wall thickness of the workpiece to choose. When the wall thickness of the product is greater than 8mm, die casting will produce a large number of pores within the wall, so the thicker wall thickness of the product can be completed through the gravity casting process.

Introduction to high pressure die casting:

Liquid or semi-solid metal or alloy, or liquid metal or alloy containing enhanced material phase, under high pressure with high speed filling die-casting cavity, so that the metal or alloy solidified under pressure to form castings. Die casting commonly used pressure for 4 ~ metal filling speed for 0.5-120m/s. So, the metal liquid filling time is very short, about 0.01-0.2 seconds (according to the size of the casting and different) can fill the cavity. Therefore, high pressure, high speed is the fundamental difference between the die-casting method and other casting method, is also an important feature. -Ningbo Hexin

The characteristics of aluminum die castings are as follows:

• 1, the product surface finish is good, generally up to Ra6.3 or even Ra1.6.
• 2. Generally not heat treatable.
• 3, high airtightness of the product, casting strength and surface hardness, but low elongation, wall thickness is too thick prone to porosity.
• 4、High cost of molds and short service life.
• 5. High production efficiency.
• 6, can produce thin-walled parts, processing allowance is small.
• 7. Special aluminum alloy cannot be used.

Introduction to low pressure casting:

In the sealed crucible (or sealed tank), through the dry compressed air, the liquid metal enters the straight casting channel along the ascending liquid pipe under the gas pressure, and enters the cavity smoothly through the inner casting channel, keeping the gas pressure on the liquid level in the crucible. Until the casting is completely solidified. Then lift the gas pressure on the liquid level, so that the unsolidified liquid metal in the rising tube flows back to the crucible. Then open the mold, take out the casting. The casting method is good, dense casting organization, easy to cast large thin-walled complex castings, no need for risers, metal harvesting rate of 95%. non-polluting, easy to realize automation. But the equipment cost is high, low production efficiency. Generally used for casting non-ferrous alloys. -Ningbo Hexin

Aluminum low-pressure parts are characterized as follows:

1、Compared with die casting, the product surface is worse than gravity parts.

2. Aluminum castings have fewer internal holes and can be heat-treated.

3, the product airtightness is high, casting strength and surface hardness is higher than die-casting, but the elongation is lower than gravity.

4、Low mold cost and low service life.

5, the production efficiency is lower than gravity, far lower than die-casting.

6、Complex process, for the production of high-demand, high-quality castings.

7. Low flowability special aluminum alloy can be used.

Simply put, low pressure is a compromise between high pressure and gravity.

Ningbo Hexin High Quality Aluminum Casting Service

Aluminum alloy casting is one of the best choices for your production products. Ningbo Hexin covers aluminum alloy low pressure die casting, high pressure die casting and gravity die casting. With more than 20 years of rich experience in aluminum alloy development, we are a professional factory creating custom aluminum alloy castings.

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