Well type cyclic annealing process for bare copper flat wire

Abstract

The invention provides a well type cyclic annealing process for a bare copper flat wire of a pot type hot-air cyclic annealing furnace with a patent number of ZL201120172272.1. The well type cyclic annealing process comprises the following steps: 1) feeding materials into the furnace; 2) pumping to reach a vacuum state; 3) feeding protective gas; 4) heating and carrying out heat preservation; 5) discharging the materials out of the furnace, and cooling; and 6) discharging the finished product from the furnace. The well type cyclic annealing process for the bare copper flat wire is simple, and the bare copper flat wire annealing specification scope is wide; and the protective gas is supplied and cycled in the annealing furnace, so that the problem that the bare copper flat wire cannot be uniformly annealed due to different temperatures in the upper part, the middle part and the lower part of the annealing furnace can be effectively solved.

Description

technical field [0001] The invention relates to a process operation method for the heat treatment process of bare conductors in the wire and cable industry, in particular to a well-type circular annealing process for bare copper flat wires. Background technique [0002] After the bare copper flat wire is drawn and rolled to make it smaller, its internal stress becomes larger (commonly known as hardening), and its electromechanical properties cannot meet the requirements of electromagnetic wires for motors and transformers. In the wire and cable industry, the bare copper flat wire (type denoted as TBR) needs to be soft. Its size is reduced by drawing, finishing rolling, etc., and it needs to be softened and annealed, and then the surface of the bare copper flat wire is covered with insulation Materials used to make magnet wires for motors and transformers. [0003] Existing well-type annealing furnace is used to implement softening annealing of bare copper flat wire. The bar...

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Problems solved by technology

Problems in this method: 1) The heating and cooling time is long, and the cross-section of the bare copper flat wire reaches 25mm 2 When above, the static heating and cooling time period can be as long as more than 30 hours; 2) The heat transfer between the upper, middle and lower parts of the furnace body is very uneven; resulting in high power consumption, limited production capacity, and unstable electromechanical performance of the product

[0004] The patent number is CN102443748 A. The Chinese invention patent named "Bright Annealing Process of Copper Bars" only solves the annealing of copper bars, and its specification range is narrow; only internal heating cycle is used without internal cooling cycle, and the energy saving effect is not fully achieved; there is no solution The uniformity of annealing when the upper, middle and lower temperatures are inconsistent

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