Roll bending forming device and forming method for ten-hole micro-channel flat tubes

Abstract

The invention discloses a roll bending forming device for ten-hole micro-channel flat tubes. The roll bending forming device comprises an uncoiling machine, a straightening machine and a roll bending forming unit which are sequentially arranged. The roll bending forming unit comprises an upper row of mill rolls, a lower row of mill rolls, a brazing flux coating device and a product straightening device, multi-pass roll bending forming roll pairs are sequentially configured to form the upper row of mill rolls and the lower row of mill rolls, the brazing flux coating device and the product straightening device are arranged among the roll bending forming roll pairs, gaps are reserved between the upper row of mill rolls and the lower row of mill rolls, and the shapes and the sizes of the gaps are matched with the shapes and the sizes of the ten-hole micro-channel flat tubes. The invention further discloses a forming method implemented by the forming device. The roll bending forming device and the forming method have the advantages that precision dies can be omitted, a series of problems caused during continuous extrusion can be solved, and the manufactured flat tubes are stable in quality; the extrusion speed normally ranges from 2 meters per minute to 3 meters per minute when ten-hole micro-channel flat tubes are manufactured in an extrusion mode, but the roll bending technological manufacturing speed is higher than 80 meters per minute, and the manufacturing efficiency can be improved by 20 times as compared with the traditional extrusion mode; additional welding techniques are omitted in roll bending forming procedures, and integral heat exchangers can be manufactured only by the aid of a brazing technique.

Description

technical field [0001] The invention relates to the technical field of manufacturing methods and equipment for processing microchannel flat tubes for heat exchange, in particular, to a roll forming device and forming method for ten-hole microchannel flat tubes. Background technique [0002] The air-conditioning heat exchangers used in the heating, ventilation and refrigeration industry traditionally use round copper light tubes or high-efficiency internal threaded tubes and external finned aluminum tubes. Due to the restrictions on freon refrigerants, the condensers and evaporators of automotive air conditioners no longer use tube-sheet structures made of copper tubes and aluminum foils. Almost all cars use aluminum parallel flow condensers and stacked evaporators. They have the advantages of light weight and good heat exchange performance. Parallel flow heat exchanger adopts porous micro-channel flat tube, the channel size is about 0.5mm, and the more the number of micro-c...

AI Technical Summary

Problems solved by technology

[0005] 2. The production equipment consumes a lot of energy

Mold replacement needs to go through fourteen processes, which affects work efficiency

The demand for extrusion force is large, and the energy consumption of equipment is high

[0006] 3. Unstable product quality

"Although this invention avoids a series of problems in the continuous extrusion process, the invention has the following limitations in the specific implementation: First, the strip material needs to be pressed with micro-grooves before roll bending, so the strip material has Strict requirements; moreover, the welding on both sides of the symmetry requires an additional pressure welding process, which seriously hinders the speed of pipe making

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