Extrusion die for preparation of flat pipes of micro-channel heat exchangers

Abstract

The invention discloses an extrusion die for the preparation of flat pipes of micro-channel heat exchangers. The extrusion die comprises a divergent die, a cavity die, a core rod, a main die sleeve and a die bush, wherein the divergent die is provided with a divergent bridge, the two sides of the divergent bridge are provided with two divergent holes, and a pressure-bearing surface of the divergent die is a semispherical surface or an involute curved surface; the cavity die is provided with a welding chamber and a cavity; the core rod is removably provided with a die core, and the core rod is provided with a step and connected with the divergent die; the main die sleeve and the die bush are respectively matched with the divergent die and the cavity die; after the divergent die, the cavity die and the core rod are assembled, the obtained assembled object is integrally embedded in the main die sleeve, and finally, the main die sleeve is connected with the die bush. According to the invention, the integral stress condition of the die can be improved, and the extrusion force is reduced; and the divergent die and the cavity die can be used repeatedly and can be matched with different die cores, therefore, the production efficiency can be greatly improved, and the manufacturing and maintenance costs of the die can be reduced.

Description

technical field [0001] The invention relates to a mold, in particular to an extrusion mold for flat tubes of microchannel heat exchangers, which is mainly used for extrusion molding of flat tubes of heat exchangers and belongs to the technical field of mold processing. Background technique [0002] Heat exchanger flat tubes are necessary parts for air conditioners and other equipment. With the rapid development of my country's automobile industry and the continuous introduction of foreign advanced technology, the demand for flat tubes for automobile heat exchangers is increasing day by day. Although there are hundreds of aluminum profile extrusion factories in China, production is difficult due to its complex cross-sectional shape, high dimensional accuracy. In order to produce products with high technology content and high added value, this extrusion die has been developed. [0003] At present, the common disadvantages of extrusion dies for heat exchanger flat tubes are a...

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Problems solved by technology

[0004] 1. The pressure-bearing surface of the traditional splitter mold is flat, and the pressure-bearing capacity is insufficient, which greatly shortens the life of the mold; and for the shortcomings of the insufficient strength of the pressure-bearing surface, it is generally used to increase the thickness of the shunt bridge, which will increase the mold. weight, but also increases the cost

[0005] 2. The structure of the traditional mold core and the splitter die is generally integrated. This form must be matched with the corr

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