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Casting temperature and direction control of stainless steel impeller castings
- Apr 27, 2018 -

In the process of machining the stainless steel impeller castings, the casting position of the casting refers to the position of the casting in the casting during casting. This position has a great influence on the quality of the casting during use. The large plane of the casting should face downwards. This is because during the pouring process, the high-temperature liquid metal has a strong heat radiation on the upper surface of the cavity. Obviously, the thicker the plane in the horizontal position, the easier the upper surface is to generate sand. For this reason, for flat-plate type castings, the large plane should be face down.

Each year, stainless steel impeller castings often account for about 20% of castings discarded due to casting temperatures. The pouring temperature of castings is closely related to the surface quality of the castings. Therefore, to increase the casting yield, it is necessary to control the pouring temperature. Pouring temperature maximum. Pouring too high a temperature will cause the sand type to rise, especially for castings with complex sand cores. When the pouring temperature is ≥1420°C, the waste product will increase, and when the pouring temperature is 1460°C, the waste product will reach 50%. Therefore, the pouring temperature of castings should be controlled to be below 1420°C.

The lowest casting temperature of stainless steel impeller castings, when the pouring temperature is lower than 1380°C in the process of operation, after the processing, a small single hole is found under the cast iron skin, and the diameter of the hole is generally 1 ~3mm. In individual cases, there are only 1-2 small holes, and these small holes will appear together with a small amount of liquid slag.

Stainless steel impeller casting temperature should be controlled at 1380 ~ 1420 °C. In addition, the most common reason for the low pouring temperature is that the molten iron is transported and stays in the open ladle for a long time before being cast to dissipate heat. With ladle lids with thermal insulation, heat loss can be significantly reduced.

Stainless steel impeller castings can't control the direction. Anyway, this motor is a very significant invention. When used as a DC generator, the present invention can generate a DC current of continuous amplitude, thereby avoiding the use of a filter capacitor. The rotor can be a permanent magnet, a brushed excitation or a brushless excitation. When used as a large motor, this motor generates self-inductance and requires a protective device.