Aluminum alloy fin material for heat exchanger and manufacturing method thereof

Abstract

This heat exchanger aluminum alloy fin material: has an Fe concentration of 0.20-1.0 mass% and a Cu concentration of 0.02-0.1 mass%; suppresses Si concentration to 0.15 mass% or less, Mn concentration to 0.015 mass% or less, and Cr concentration to 0.015 mass% or less; and has the remainder comprise Al and inevitable impurities. Therein, the thickness of the heat exchanger aluminum alloy fin material is 0.1 mm or less, the average particle diameter of the subgrains is 2.5 µm or less, and the volume fraction of ß-Fiber is 80% or more. This fin material makes it possible to suppress the occurrence of collar cracking during forming.

Description

technical field [0001] The present invention relates to an aluminum alloy fin material for a heat exchanger and a manufacturing method thereof. Background technique [0002] In recent years, aluminum alloy fin materials for heat exchangers (hereinafter referred to as fin materials) used in heat exchangers such as air conditioners have been replaced by new refrigerants due to Freon regulations, and the size and weight of air conditioners themselves have been reduced. Or high performance and other reasons, more and more pursuit of thin-walled, plate thickness thin-walled below 0.15mm, has recently reached the level of 0.09mm. [0003] Here, the forming method of the fin material includes a stretching method, a thinning stretching method, and a stretching and thinning stretching hybrid method (hybrid method). The stretching method consists of a bulging process, an extrusion process, a hole opening (punching) and a hole expansion (Burring) process, and a washing process. The th...

AI Technical Summary

Problems solved by technology

That is, cracks in the collar not only damage the appearance of the fins, but also cause problems such as poor performance of the heat exchanger, which reduces the value of the product

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