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How is the size of the low pressure casting machine determined?
The low pressure casting machine is suitable for the production of large-scale, thin-walled castings,and there is almost no limit to the size of the product.
The size of the low pressure casting machine depends on the size of the mold and the distance from the core.
The size of the mold and the distance from the core are dependent on the size and structure of the product.
The capacity of the holding furnace depends on the weight of the product and the output required by the customer.
What kinds of holding furnaces are used in low-pressure casting machines?
1. Crucible type holding furnace: the most common use, low cost, easy maintenance, suitable for small and medium-sized production and high quality castings.
2. Molten pool type holding furnace: suitable for large output and continuous production.
3. Double chamber molten pool type holding furnace: It is suitable for customers with large output, large casting and continuous production.
How is the mold used in the low pressure casting machine heated?
1. Flame heating (small mold)
2. Electric heating (general)
3. Oven heating (suitable for large mold heating)
What mold is used in the low pressure casting machine?
Low-pressure casting machines generally use permanent metal molds,and the materials are generally 40Cr, 38Cr, H13, HM3, and the like.
In addition, low-pressure casting machines can also use sand mold, gypsum mold, graphite mold, investment shell molds and so on.
The mold should be preheated to 300 degrees Celsius before use, and the mold temperature should be maintained between 200-400 degrees Celsius throughout the casting process.
What are the disadvantages of low pressure casting machines?
1. One-piece production cycle is long, usually takes a few minutes.
2. The housing thickness of the casting generally needs to exceed 4mm.
What are the advantages of low pressure casting machines compared to other casting methods?
1. The filling of metal liquid is stable,and the speed is controllable, and the gas and oxidation are reduced, which can improve the casting quality.
2. Product repeatability is good and high pass rate.
3. The fluidity of the molten metal is good, which is beneficial to the casting of thin-walled castings with clear outline and smooth surface.
4. The pouring gate is small,and the processing allowance is small, and it has no riser, which occupy about 10%-25% of the total weight.
5. Casting dimension and weight are not limited by the machine.
6. Other materials such as sand core can be placed in the mold cavity to produce castings with complex internal structures.
7. Equipment is easy to mechanize and automate.
What products does low pressure casting machines produce?
Low pressure casting machines are used to produce high quality aluminum alloy castings.
Such as: Aluminum alloy wheels for the automotive industry, engine cylinder heads, cylinder blocks, large aluminum alloy frames and other safety components.
High-voltage switches, power fittings, etc. in the power industry.
Valves, pumps, aluminum casings, etc. in industrial fittings.
Sand core and other material can be placed in the mold cavity of the low-pressure casting to manufacture the casting having complicated inner wall.
The castings produced by low-pressure casting can be subjected to T6 heat treatment,which can further improve the mechanical properties of the products.
What are the main applications of low pressure casting machines?
The low pressure casting machine is an advanced special casting method for the production of precision castings for aluminum alloys. It has a wide range of applications in the automotive motorcycle industry, textile machinery, aerospace, power industry, industrial valve pump body, etc. Especially in the production of large, complex, thin-walled aluminum alloy castings, it has great advantages, and it can realize precision, thin wall and light weight.
What is the principle of a low pressure casting machine?
By giving a certain amount of dry compressed air to the sealed holding furnace, the aluminum liquid in the holding furnace flows into the metal mold cavity along the riser tube under the action of air pressure, and the aluminum liquid in the metal mold cools under a certain pressure. At last, it gets the tight casting.
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