Manufacture method and forming die of fin for heat exchanger

Abstract

The invention provides a manufacture method and a forming die of a fin for a heat exchanger. The method is characterized by comprising the following steps of: progressively stretching thin metal plates arranged an upper die and a lower die at least twice by gradually reducing the diameter to form a cap-shaped lug boss at a certain height; processing and punching a hole on the cap-shaped lug boss,turning the inner flange of the obtained pore to form a cylindrical part; expanding the cylindrical part to a special conicity and extruding and forming so that the bottom and the mouth of the wall surface of the conical extrusion part are thicker than the middle of the conical extrusion part, the flanging mouth is well supported, and the aim of preventing the flanging mouth from cracking is achieved. Segment pitches are adjusted through an inclined wedge assembly arranged between the lower die and an extrusion terrace die to match the requirements for different segment pitches and the methodcan be used to form flange holes with higher adjustable pitches.

Description

technical field [0001] The present invention relates to a method for manufacturing heat exchanger fins and its forming die, in particular to a manufacturing method and forming die for performing specific taper expansion and extrusion on a preformed cylindrical portion of a metal thin plate. Background technique [0002] Fins for heat exchangers are usually formed with a plurality of through-hole structures with a certain height in the length direction of aluminum or copper metal sheets. Such through-holes can expand the heat transfer area of ​​the inserted heat exchange tubes and improve Heat transfer efficiency of heat exchange tubes. [0003] In the prior art, there are many ways to produce fins for heat exchangers. The first method uses progressive drawing, punching, inner edge flanging and curling for metal sheets. This method completely relies on progressive drawing. Stretching to achieve the height of the opening is difficult to achieve when applying a harder sheet an...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for producing fins for heat exchangers and a forming die for fins for heat exchangers to solve the defects in the prior art that are easy to wear and tear through holes in the prior art. The thinned roll mouth is easy to crack, and the sheet distance is difficult to achieve when the thinning amount is small, and the purpose of realizing the adjustment of the sheet distance and the roll mouth is not easy to crack

Images