Mould for flat tube molding and machining method thereof

Abstract

The invention relates to a mould for flat tube molding and a machining method thereof. A containing groove is formed in a first upper surface of an upper mould blank, and the size of the containing groove gradually decreases from the first upper surface toward a first lower surface. A mould core includes a mould core body and a molding end, the size of the mould core body is matched with that of the containing groove, so that tensile stress per unit area on the cross section of the mould core gradually decreases in the direction from the molding end to of the core body, and the service life ofthe mould core is prolonged. A mould core middle piece is embedded into the containing groove. A plurality of first molding grooves arranged at intervals are formed in the end face of the molding endand then assembled with a lower mold, and the molding end is inserted into a molding cavity. If the mould core is damaged, the mould core is only required to remove from the containing groove for replacement, so that the service life of the mould is further prolonged; and at the same time, the replacement of the mould core is easy, and the maintenance time of the mould is shortened.

Description

technical field [0001] The invention relates to the technical field of extrusion dies, in particular to a die for flat tube forming and a processing method thereof. Background technique [0002] With the rapid development of the automobile industry, the demand for heat exchangers used in automobiles is increasing day by day. Usually, the heat exchanger of automobiles adopts parallel flow aluminum flat tube heat exchanger, and the flat tube has the structural characteristics of flat and wide, thin wall, many holes, complex cross-sectional shape, high dimensional accuracy and difficult production. At present, the manufacture of flat tubes is carried out by extrusion molding with molds. Because the traditional mold surface is easy to wear, the traditional method is to use the process of strengthening the surface of the mold. However, using this process, the operation is complicated, resulting in a long cycle for mold wear and repair. Since the wall thickness of the flat tube i...

AI Technical Summary

Problems solved by technology

Usually, the heat exchanger of the car adopts the parallel flow aluminum flat tube heat exchanger, and the flat tube has the structural characteristics of flat and wide, thin wall, many holes, and complex cross-sectional shape. At the same time, the dimensional accuracy is high and the production is difficult.

At present, the manufacture of flat tubes is carried out by extrusion molding with molds. Because the traditional mold surface is easy to wear, the traditional method is to use the process of strengthening the surface of the mold. However, using this process, the operation is complicated, resulting in a long cycle for mold wear and repair.

Since the wall thickness of the flat tube is required to be thin, the allowable number of surface strengthening is also limited, resulting in a very low life of the mold and high manufacturing costs of the flat tube

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