Expendable pattern casting technique for aluminum alloy internally provided with spiral coiled tube water passage

Abstract

The invention discloses an expendable pattern casting technique for an aluminum alloy internally provided with a spiral coiled tube water passage. According to the technique, the spiral coiled tube water passage made of stainless steel or copper is prefabricated firstly, and the upper end and the lower end of the spiral coiled tube water passage are provided with a water inlet and a water outlet which are capable of being exposed out of the column face of a motor shell correspondingly. A foaming mold is utilized for positioning and forming, an integrated motor shell EPS white mold internally comprising the prefabricated spiral coiled tube water passage can be machined through one-time forming, and then through the expendable pattern casting technique, the aluminum alloy motor shell internally provided with the spiral coiled tube water passage in an embedded mode is casted. An auxiliary structure capable of being tightly combined with the casted aluminum alloy shell is arranged on the spiral coiled tube water passage, internal stress generated by cold-hot change is reduced, and the shell is prevented from cracking. The spiral coiled tube water passage is further connected with a casting technique supporting framework, the aluminum alloy motor shell internally provided with the spiral coiled tube water passage can be stably and reliably casted on a large scale through an expendable pattern, the prefabricated spiral coiled tube water passage does not need to be filled with sand before casting, the water passage is smooth and not prone to being plugged, and it is ensured that the cooling effect is good.

Description

technical field [0001] The invention relates to the technical field of production of new energy motor casings, in particular to an aluminum alloy lost foam casting process 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 and use a motor casing with a water-cooled circulation channel. At present, a spiral with better cooling effect is usually installed in the motor casing. The water-cooling circulation channel, because the aluminum alloy motor casing is a thin-walled part with a comple...

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Problems solved by technology

[0003] 1. The sand core needs to be pre-embedded during pouring, 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 pouring, which makes it difficult to effectively form the spiral water-cooling circulation channel in the motor shell and make it difficult to manufacture in batches Qualified products;

[0004] 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 cast 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, which will easily block the water-cooling circulation channel and affect the cooling effect;

[0005] 3. The wall thickness of the motor casing is very thin, generally about 5mm. The sand core is easy to be eccentric during casting, resulting in uneven thickness of the motor casing, and a high risk of water leakage during machining;

[0006] 4. Many vent holes need to be made when pouring with sand cores, resulting in many process holes on the motor shell, which need to be sealed with plugs, which has the risk of leakage and the product is not beautiful;

[0007] 5. Manual cleaning of the residual sand in the spiral water-cooling circulation channel in the later stage has a large workload and high labor costs

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