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2023.2.27
The quality and output of castings are directly impacted by centrifugal casting technology’s eight primary processes, which include metal filtering, pouring temperature, pouring speed, slag solidification, coating application, mold release, pouring system, and pouring quota. Investment casting, also known as precision casting, is used in stainless steel foundries. This method of casting requires minimal to no machining, making it a cutting-edge technique in the foundry business. We divide stainless steel into two categories, Cr stainless steel and Cr and Ni stainless steel, based on their chemical makeup. Today, we are going to find out the 7 stages of the centrifugal casting process.
The corrosion resistance of stainless steel is primarily determined by its carbon and carbide content and by the presence of precipitated carbides. Hence, the C content in corrosion-resistant stainless steel should be as low as possible. C is often below 0.08%. Yet, the stable carbide precipitation phase in the structure of heat-resistant steel is what ultimately determines the material’s high temperature mechanical capabilities. Hence, heat resistant steel has a greater carbon content, typically exceeding 0.20 percent. Boilers, steam turbines, power machinery, industrial furnaces, aviation, petrochemical, and other industrial sectors rely on components made at heat-resistant steel foundries. This is correct:
1. Metals in liquid form are filtered
Some alloy liquids have more slag than others, and that slag can be a pain to clean up. Filters like foam ceramic filters and glass fiber filters can be installed in the pouring system to remove slag.
2. The temperature at which liquid can be poured
The annular, sleeve-shaped, and tubular centrifugal casting is the main component. Filling molten metal is facilitated by centrifugal time pressure or centrifugal force, and the resistance encountered during filling has a little effect. Hence, centrifugal casting allows a 5–10 C reduction in pouring system temperature compared to gravity casting.
3. The Rate at which Molds may be Created
It has a significant role as a technical process influencer in centrifugal casting. There are a variety of castings, methods of casting production, and rates of mold rotation that are used to make each type of casting. Low mold speed increases the risk of flaws including porosity, slag inclusion, and an uneven inner surface of the casting due to insufficient liquid metal filling in vertical centrifugal casting and a phenomena called “liquid metal rain” in horizontal centrifugal casting. Large vibration, increased wear, and excessive power consumption costs will be experienced by the enterprise machine learning due to the high casting speed requirement, the casting’s susceptibility to obvious cracks, segregation, and other defects, and the outer surface of sand centrifugal casting gradually forming defects such as box expansion. As a result, the development of China’s principle for the selection of casting speed should be based on selecting the least value under the premise of ensuring the realization of casting structure quality.
4. Slag Reuse and Recycling
Slag forming agent and liquid metal can be poured into the mold at the same time during the pouring process to prevent subcutaneous shrinkage defects caused by the bidirectional solidification of thick wall centrifugal castings. This is accomplished by covering the inner surface of the casting with slag, which prevents heat dissipation from the inner surface and creates the condition of sequential solidification from the outside to the inside.
During casting slag remover, the powder slag remover is added to the pouring tank, and the molten slag and metal are poured into the mold at the same time.
5. The application of color
Coating for casting in a centrifugal mold is composed similarly to coating for casting in a gravity mold. The residual coating on the working surface of the mold can be difficult to remove when casting slim centrifugal castings. The adhesive strength in the coating should be minimized as much as possible to make removal easier.
6. Demoulding a casting
Assuming quality is maintained, removing the mold casting as soon as possible will increase production efficiency. The demoulded casting may need to be cooled quickly by being placed in an insulating furnace or buried in a sand pile to prevent cracking. The castings can be taken from the centrifugal casting machine as soon as the casting stops rotating, cooled slowly in the sand pile, and demoulded at room temperature if they are difficult to disassemble and require gradual cooling and fracture prevention.
7. Gated system
Students’ acceptance of the Chinese metal pouring cup and the pouring groove closely associated to it—and, in certain cases, the runner in the mold—is at the heart of the pouring operation system management in centrifugal casting.