Technological mandrel and method for manufacturing squirrel-cage rotor by using same

Abstract

The invention discloses a technological mandrel in an aluminum casting process of a squirrel-cage rotor of an asynchronous motor, and a method for manufacturing the squirrel-cage rotor by using the technological mandrel. The technological mandrel is called as a primary and secondary mandrel; the technological mandrel consists of a secondary mandrel part with convex keys and a primary mandrel which takes a smooth cylindrical surface as a main body structure; the secondary mandrel part and the primary mandrel part are matched with each other through a groove with a wedged oblique surface; and the direction of the wedged oblique surface is parallel to the axial direction of the rotor. According to the technical scheme of the invention, the flatness and linearity of the cylindrical surface in the inner hole of the aluminum cast rotor are guaranteed; and the squirrel-cage rotor manufactured in thermal jacket or cold pressing way can be prevented from reprocessing of the inner hole, and the labor cost and expenditure consumed by a cutter are reduced. For the occasion for producing the squirrel-cage rotor by virtue of common casting devices, by utilizing the method in invention, the products suitable for precision demands can be produced.

Description

technical field [0001] The invention relates to a process mandrel used in the aluminum casting process of a squirrel-cage rotor of an asynchronous motor and a method for manufacturing a squirrel-cage rotor using the same. Background technique [0002] In the aluminum die-casting process of the squirrel-cage motor rotor on ordinary die-casting equipment, a specified number of rotor punches 2a must be fitted on the cast aluminum mandrel 1a with spiral convex keys that match the punched shaft holes. Aluminum die-casting process can be implemented. The spiral convex key 111a on the mandrel evenly displaces each rotor punch 2a according to the design requirements, so that the slope formed by the conductive aluminum strips of the squirrel-cage rotor 1a in the circumferential direction meets the design requirements; at the same time, the outer circle of the mandrel 11a is matched with the shaft hole of each rotor punch, and a fit gap of 0.06-0.10mm is formed between the outer circ...

AI Technical Summary

Problems solved by technology

[0003] The problem existing in the prior art is: the flatness of the surface of the shaft hole is relatively low, and reaming is still required to make the surface quality and size meet the requirements

However, the cohesion area of ​​the rotor inner circle 21a after reaming is reduced by 40%-50%, which reduces the reliability of the combination of the rotor core and the shaft

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