Copper rotor vacuum die-casting die

Abstract

The invention relates to a copper rotor vacuum die-casting die which mainly comprises a movable formwork, a static formwork corresponding to the movable formwork, a core pulling sliding block mountedon the movable formwork, a moving die insert, a lower half block, an upper half block mounted on the core pulling sliding block, a static die insert and a pressing chamber, wherein the moving die insert and the lower half block are disposed on the movable formwork; and the static die insert and the pressing chamber are mounted on the static formwork. Exhaust blocks are arranged at the upper ends of the movable formwork and the static formwork respectively, each exhaust block is designed into three independent exhaust wave plates, and gaps of the exhaust wave plates on the two sides are smallerthan a gap of the middle exhaust wave plate. According to the copper rotor vacuum die-casting die, by the design of two exhaust channels, a mode of pumping out gas in the pressure casting process step by step is achieved, the exhaust area and the vacuumizing capability are improved, the exhaust capability is improved, the gas flow-out stroke is shortened, so that the gas is effectively pumped out, and the vacuum pressure of a cavity of the die-casting die is maintained at 10 KPa. The die is suitable for vacuum die casting of pure copper and copper alloy.

Description

technical field [0001] The invention belongs to the technical field of vacuum die-casting, and relates to a vacuum die-casting mold for an induction motor copper rotor, which is suitable for vacuum die-casting of pure copper and copper alloys. Background technique [0002] Copper's excellent electrical conductivity, excellent thermal conductivity, and high-pressure casting have the advantages of short molding cycle, high production efficiency, and environmental friendliness, making cast copper rotors widely used in high-efficiency motors with the implementation of motor energy efficiency policies, especially It has been applied in batches in the field of industrial motors such as reducers and in the field of low-speed motor vehicles. However, due to the existence of air in the cavity and pressure chamber in the die-casting process of ordinary die-casting technology, when the punch pushes the molten metal to fill the cavity, the air is drawn into the molten metal due to the t...

AI Technical Summary

Problems solved by technology

However, because the copper rotor die-casting technology needs to put the iron core stacked with silicon steel sheets into the mold before die-casting, the iron core and the mold form the cavity together, and the design of the core-pulling slider is required in the design of the die-casting mold to facilitate the iron core. Putting in and taking out the cast copper rotor after die-casting, the slider design is likely to become the most likely place for air leakage in the vacuum design, which not only adds difficulties to the mold sealing design of the copper rotor vacuum die-casting, but also is affected by high temperature after the silicon steel sheet is placed in the die-casting mold Continuous gas production puts forward higher requirements on the vacuum degree of the cavity and the capacity of vacuuming equipment

In addition, due to the high melting point of copper (the melting point of copper is 1083.4°C), the pouring temperature of cast copper is not lower than 1100°C, which makes the casting copper rotor vacuum die-casting technology face many technical difficulties

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