Cast aluminum dummy shaft

Abstract

The invention discloses a cast aluminum dummy shaft, which comprises a cylindrical dummy shaft body with a split structure, the dummy shaft body comprises a dummy shaft fixing block, a middle block and a dummy shaft movable block, and the dummy shaft body is perpendicular to its longitudinal axis at least There is a keyway with a waist-shaped hole in cross section. The keyway runs through the fixed block of the false shaft, the middle block and the movable block of the false shaft. There are positioning pins in the keyway. There is a tension spring groove, the two ends of the false shaft fixed block and the false shaft movable block are fully tightened by the tension spring, and the false shaft body is provided with a cover plate toward the small end of the longitudinal section of the middle block, and the cover plate corresponds to the small end of the longitudinal section of the middle block. There is an escape hole. Compared with the prior art, the present invention has the beneficial effects that: when withdrawing the shaft, the wedge only needs to be tapped with the workpiece at the let-away hole, and the wedge moves to the left to realize the withdrawal of the shaft, the structure is simple, the tightening effect is good, and It is not easy to be deformed, the shaft hole is stacked uniformly, the production efficiency is high, and water resources are saved.

Description

technical field [0001] The invention relates to a cast aluminum dummy shaft, which belongs to the field of motor cast aluminum rotor manufacturing. Background technique [0002] In the prior art, the dummy shaft of the centrifugal cast aluminum rotor adopts an integrally fixed outer circular ribbed structure dummy shaft, and the centrifugal cast aluminum rotor utilizes the principle of thermal expansion and contraction when the shaft is retracted after pouring, and the cast aluminum dummy shaft is rapidly cooled with water, so that The cast aluminum dummy shaft quickly cools and shrinks to realize the rotor retraction. This structure of the cast aluminum dummy shaft has defects in use: the rotor core temperature is high (500-600 ℃) and the contact with water, the impact The sheet material will generate stress, which will cause the punched sheets at both ends of the shaft hole to bounce off and deform. The integrally fixed outer circular ribbed structure dummy shaft, after re...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the dummy shaft of the centrifugal cast aluminum rotor adopts an integrally fixed outer circular ribbed structure dummy shaft, and the centrifugal cast aluminum rotor utilizes the principle of thermal expansion and contraction when the shaft is retracted after pouring, and the cast aluminum dummy shaft is rapidly cooled with water, so that The cast aluminum dummy shaft quickly cools and shrinks to realize the rotor retraction. This structure of the cast aluminum dummy shaft has defects in use: the rotor core temperature is high (500-600 ℃) and the contact with water, the impact The sheet material will generate stress, which will cause the punched sheets at both ends of the shaft hole to bounce off and deform. The integrally fixed outer circular ribbed structure dummy shaft, after repeated heating for several times and then rapid cooling with water, will cause deformation and waste of the dummy shaft. The rotor Iron core punches exposed to water will easily cause iron core rust, waste water resources, affect motor performance and appearance quality, the accuracy is difficult to guarantee, and cannot meet the needs of high-end customers

[0004] The above-mentioned patents have the following problems: 1. It is necessary to invest in a press to realize the retraction of the cast aluminum rotor, and the equipment investment cost is high

2. The two ends of the cast aluminum dummy shaft with expandable structure are fully tensioned, but the tightening effect of the middle part is not as good as that of the two ends, resulting in the staggering of the middle pieces, which will cause the shaft holes of the middle rotor punching pieces to be uneven, and the shaft holes cannot be guaranteed. stacking uniformity

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