A low-pressure casting method of an aluminum alloy motor casing with a built-in spiral coil water channel

Abstract

The invention discloses a low-pressure casting method of an aluminum alloy motor shell internally provided with a spiral coil pipe water way. A stainless steel or copper or aluminum spiral coil pipe water way is prefabricated, a water inlet and a water outlet are formed in the side faces of the spiral coil pipe water way, a boss for positioning is arranged on the water inlet and the water outlet, according to the structure of the spiral coil pipe water way, a motor shell low-pressure casting mold is prepared, the spiral coil pipe water way is positioned and assembled in the motor shell low-pressure casting mold, the assembled motor shell low-pressure casting mold is placed above a heat preservation furnace of a low-pressure casting machine to be subject to low-pressure casting forming, and through low-pressure casting, the prefabricated spiral coil pipe water way is casted in the aluminum alloy motor shell. The casting auxiliary process and the auxiliary time can be greatly saved, production efficiency is improved, after casting, no sand core in the motor shell needs to be cleaned, the casted aluminum alloy motor shell is few in defect, high in precision, and not prone to deformation, cracking and water leaking, the aluminum alloy motor shell is high in casting quality, and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of new energy motor casing production, in particular to a low-pressure casting method for an aluminum alloy motor casing with a built-in spiral coil water channel. Background technique [0002] New energy vehicles are electric vehicles powered by electric energy. The electric drive and control system is the core of the electric vehicle. The drive motor is an important part of the electric drive and control system. The drive motor generates a lot of heat during operation. In order to ensure that the electric vehicle can last For stable operation, it is necessary to cool the drive motor during operation. In order to ensure the cooling effect, it is best to design a motor casing with a water-cooled circulation channel inside. At present, it is usually installed in the motor casing with a better cooling effect. Spiral water cooling circulation channel. [0003] Since the aluminum alloy motor casing is a thin-wa...

AI Technical Summary

Problems solved by technology

[0004] 1. The sand core needs to be pre-embedded during casting, and the strength of the spiral sand core with a small cross-sectional area is low, and the spiral sand core is easy to break during casting, which makes it difficult to effectively form the spiral water-cooling circulation channel in the motor shell, and it is difficult to manufacture in batches Qualified products;

[0005] 2. If adhesives are used to increase the strength of the spiral sand core, after the casting is completed, due to the poor collapse of the high-strength spiral sand core, it is difficult for the spiral sand core in the casted motor shell to flow from the spiral water-cooling circulation channel. If it is taken out, there will be residual sand in the spiral water-cooling circulation channel that is difficult to clean, and the residual sand will easily block the water-cooling circulation channel and affect the cooling effect;

[0006] 3. The wall thickness of the motor casing is very thin, generally around 5mm. The sand core is easy to be eccentric during casting, resulting in uneven thickness of the motor casing after casting. During machining, it is easy to cause holes in the spiral water cooling cycle to cause water leakage;

[0007] 4. Many vent holes need to be made when casting with sand cores, resulting in many process holes on the motor shell after casting. unsightly;

[0008] 5. Manually cleaning the residual sand in the spiral water-cooling circulation channel of the motor shell after casting is heavy workload and high labor cost

[0011] When using the conventional low-pressure casting process to cast the spiral water-cooling circulation channel inside the aluminum alloy motor casing, it is also necessary to set a spiral sand core corresponding to the spiral water-cooling circulation channel in the cavity of the low-pressure casting mold, and the cast motor casing also needs Cleaning the residual sand in the spiral water-cooling circulation channel inside the aluminum alloy motor casing, although the low-pressure casting process can greatly improve the conventional casting casting, but there are also the general problems of the aforementioned casting casting process, so it is best to be able to Further improve the product structure and production process of aluminum alloy motor casings, so as to better improve product quality and reduce production costs

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