Annealing method of cast-rolling aluminum foil used for air conditioner radiation fin

Abstract

The invention provides a method for annealing a rolling-casting aluminum foil used for an air conditioner radiating plate, which is characterized by comprising the following steps: 1) raising the furnace gas temperature of an annealing furnace to between 200 and 230 DEG C and keeping the temperature for 1 to 3 hours; 2) raising the furnace gas temperature of the annealing furnace to between 316 and 375 DEG C and keeping the temperature for 80 to 200 minutes; and 3) reducing the furnace gas temperature of the annealing furnace to between 266 and 300 DEG C and keeping the temperature for 3 to 5hours. The method adopts a differential temperature annealing process to raise the furnace gas temperature of the annealing furnace so that the speed of temperature rise is increased, the nucleating rate of the internal grain structure of the aluminum foil is larger than the growth rate to achieve recrystallization, and the crystallizing structure is tiny and uniform to achieve the optimal mechanical property; besides, belt oil on the material surface is volatilized to effectively prevent the defects of oil spot and the like on the surface of the aluminum foil, ensure that the quality of the surface of the aluminum foil is good, shorten the total time for annealing the aluminum foil, and improve the production efficiency.

Description

Technical field [0001] The invention relates to an annealing method, in particular to an annealing method of cast-rolled aluminum foil for heat sinks of air conditioners. Background technique [0002] After more than ten years of development, China has become a major manufacturer of air conditioner heat exchangers, accounting for about 67% of the world's total output. In 2007, it is estimated that 60 million air conditioners will be produced in China, which is truly the world's largest in terms of output. 1. But like all home appliance industries, China is definitely a big air-conditioning country, but not a strong air-conditioning country. The most important thing is that the technology level of the material industry is very different from that of developed countries. Air conditioners are already indispensable electrical appliances in people’s lives. Air conditioner radiators are one of the main parts of air conditioners. Therefore, the amount of aluminum foil used for air condi...

AI Technical Summary

Problems solved by technology

[0003] At present, the annealing of aluminum foil for air conditioner heat sinks mainly adopts the method of low-temperature and long-term heat preservation annealing. This method has the following disadvantages: abnormally coarse grains and low elongation are prone to occur during the annealing process ; The mechanical properties of the aluminum foil in the same furnace are not uniform; there are oil spots on the surface of the aluminum foil; at the same time, the annealing cycle is long and the production efficiency is low