Casting process method of integrated water cooling circulation motor casing

Abstract

The invention discloses a casting process method of an integrated water cooling circulation motor casing. The method includes the steps that a, a water channel sand core is manufactured first; b, the water channel sand core is placed in a die; c, then, die assembling is conducted on the die through hydraulic pressure stations on the periphery, and the water channel sand core is fixed through set compressing points; d, afterwards, pressure is applied to molten aluminum in a crucible through an air pressure filling control system of a low pressure casting machine; e, the height of the molten aluminum is increased slowly through a liquid rising tube, air pressure is increased when the molten aluminum arrives at the die bottom of the die, and accordingly an entire cavity is filled with the molten aluminum at the speed of 0.9-1.3 m/s; f, pressurization is conducted continuously, and the motor casing is condensed and solidified under certain pressure; g, the cast motor casing is taken out from the cavity of the die, and after complete cooling, the water channel sand core is removed through sand burning, heat treatment and sand shaking; h, a feeder head and burrs are removed ultimately. By the adoption of the casting process method, the production efficiency and the percent of pass can be improved, the labor intensity of workers is lowered, and the production cost is lowered.

Description

technical field [0001] The invention relates to a casting process method for an integrated water-cooled circulating motor casing. Background technique [0002] The motor casing used to cool the electric drive on the new energy vehicle, the built-in water channel does not allow leakage, cracks and other phenomena, its prominent feature is that the two ends are thick, and because of the water channel in the middle, it is difficult to achieve top-down compensation Shrinkage effect, casting difficulty is relatively large. At present, the split type water-cooled circulating motor housing is mainly used in the market. The inner sleeve and the outer sleeve are mainly assembled by gravity casting, processing, thermal sleeve, welding and other processes. Since this method has many production processes, the production process has certain limitations. Instability, high mold cost, large equipment investment, and it is difficult to have good compactness in gravity casting; and the split...

AI Technical Summary

Problems solved by technology

[0002] The motor casing used to cool the electric drive on the new energy vehicle, the built-in water channel does not allow leakage, cracks and other phenomena, its prominent feature is that the two ends are thick, and because of the water channel in the middle, it is difficult to achieve top-down compensation Shrink effect, casting difficulty is relatively large

At present, the split type water-cooled circulating motor housing is mainly used in the market. The inner sleeve and the outer sleeve are mainly assembled by gravity casting, processing, thermal sleeve, welding and other processes. Since this method has many production processes, the production process has certain limitations. Instability, high mold cost, large equipment investment, and it is difficult to have good compactness in gravity casting; and the split water-cooled circulating motor shell is very easy to break after welding and after some special operations such as vibration and extrusion. Defects such as cracks will seriously affect the reliability, safety and practicability of the product

Most other water-cooled cycle integrated motor casings adopt the process of machining and sealing the waterway surface through the sealing groove. This method is also unsafe under complex working conditions, especially when the sealing ring is exposed to sunshine or water immersion. There are aging and cracking phenomena, and at the same time, the production cost and labor intensity are increased through mechanical processing, which cannot meet the market demand