A copper-clad aluminum composite flat row induction continuous annealing equipment and its process

Abstract

The invention relates to induction heating continuous annealing equipment meeting the characteristics of a copper-clad aluminium composite electrical flat cable and a process using the equipment. The equipment mainly comprises a guide device, a drive device, a temperature measuring device, an induction heating system, a heat preserving section, a cooling section and a gas protective system. The equipment is characterized in that an induction heating power source adopts a frequency on the high side of an intermediate frequency so as to increase the rate of the induction heating, shorten the heating time and control the interface layer thickness; the cross section of an induction heating coil is of a flat shape similar to the shape of the cross section of the copper-clad aluminium flat cable so as to benefit the uniform distribution of temperature and the shortening of the heating time and control the interface layer thickness; a ceramic tube with a certain length and the heat preserving section are arranged to ensure that the temperature is uniform during the heating and enough time is provided to finish the recrystallization of a copper layer and an aluminium core; the forced cooling section is arranged to ensure that the temperature of the annealed flat cable can be rapidly reduced to below 150 DEG C and the copper-aluminium interface layer thickness is controlled at 2-3 micrometers. The invention further provides an annealing process using the annealing equipment.

Description

technical field [0001] The invention belongs to the field of metal layered composite materials, and provides induction heating continuous annealing equipment and a process thereof that meet the characteristics of copper-clad aluminum composite electric power flat bars. Background technique [0002] Copper-clad aluminum flat bar is a bimetallic layered composite material, which has the advantages of low density, low cost, and easy connection. busbar, etc. Copper-clad aluminum conductors or flat bars are generally made through a certain composite technology (see: Dai Yakang, et al. Wire and Cable, 1997, (5): 25-28; Xie Jianxin, et al. A cladding material horizontal continuous casting direct composite Forming equipment and process. Chinese invention patent: ZL200610112817.3.) First prepare copper-clad aluminum composite billet, and then produce products with certain cross-sectional shape and size through subsequent forming processes such as rolling, extrusion or drawing. Afte...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a copper-clad aluminum composite flat row induction continuous annealing equipment and its process for the problems existing in the isothermal annealing of the existing composite flat row electric furnace, and the problem that the traditional induction continuous annealing equipment is difficult to apply to the composite flat row. Rapid and continuous induction annealing of copper-clad aluminum flat row by medium frequency induction heating, through rapid and short-term heating, significantly shortens the holding time of copper-clad aluminum flat row at high temperature, and effectively inhibits the obvious increase in the thickness of the interface layer of copper-clad aluminum flat row , so that the copper-clad aluminum flat row after annealing can obtain uniform and fine recrystallization structure, large elongation, small interface thickness and high interface bonding strength, effectively solve the problem of softening of the flat row after annealing and decrease of interface bonding strength, The problem of reduced conductivity

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