Mechanical properties mainly refer to the tensile strength, elongation and cupping value of aluminum foil. From a usage perspective, it is hoped that the higher these three indicators are, the better. However, as far as the material itself is concerned, these three indicators are contradictory to each other, that is, when the tensile strength of aluminum foil is relatively high, the elongation index will decrease; When increasing the elongation of aluminum foil, it will cause a decrease in tensile strength. Therefore, in practical applications, the intermediate value of mechanical properties is generally taken, and the specific strength and plasticity values are related to the stamping mold during heat exchange fin processing. Generally, the stamping processing of heat exchange fins is divided into two types: stretched type and non-stretched type. The stretch punching mold requires the aluminum foil to have better plasticity, that is, the elongation is higher, and the relative strength value can be slightly lower; while the non-stretch mold requires the aluminum foil to have higher strength, and the plasticity is a secondary indicator.
There are many factors that affect the mechanical properties of aluminum foil, mainly the chemical composition and processing technology of aluminum foil. As far as the strength and plasticity of aluminum foil are concerned, by adjusting the chemical composition or changing the processing process and parameters, the plasticity or strength of the material can be changed within a certain range while keeping the other unchanged. In other words, the combination of aluminum foil strength and plasticity can be changed to a limited extent by adjusting the chemical composition and processing technology.
According to the different mechanical performance requirements of heat exchangers, there are currently three main usage states of aluminum foil: H22, H24, and H26. Each state corresponds to a certain range of strength and plasticity. Judging from the current status of the domestic aluminum processing industry, there is no unified standard for the range of mechanical properties in each state. At the same time, in practical applications, the range of mechanical properties of each state is too wide, and the mechanical properties of the product cannot be well controlled to satisfy the user.
