Casting method for producing copper strip without oxygen or with low oxygen content

Abstract

The invention discloses a casting method for the production of oxygen free or low oxygen copper strips. The process flow of the invention is that: multi-connected casting machines are adopted for fusion-horizontal continuous casting-crystallizing and hardening the casting blank, wherein, the fusion by multi-connected casting machines is that a melting furnace, a blending furnace and a holding furnace are arranged in the cavity of one furnace body; a channel is arranged in a position adjacent to bottom of the furnace to separated the three furnaces; the copper liquid is supplemented by flowing through along the channel; the temperature of the melting furnace is kept at 1200 DEG C to 1250 DEG C; the copper liquid in the blending furnace is kept in a state of boiling and the temperature of the holding furnace is kept at 1160 DEG C to 1180 DEG C. Compared with the prior art, the casting method of the invention can reduce energy consumption and the oxygen content of the products, render the processed products easy for subsequent procession, thus being applicable to processing the pure copper strip products or alloy copper strip products.

Description

technical field [0001] The invention relates to a melting and casting method for producing oxygen-free or low-oxygen copper strips, and belongs to the technical field of metal processing. Background technique [0002] Copper tape for lead frames is an important basic material for integrated circuits. At present, the domestic billet casting method is semi-continuous casting, that is, after the raw materials are melted, the copper liquid is poured into purification and heat preservation equipment, and cast into copper ingots through crystallizers and continuous casting machines. This melting and casting method requires frequent pouring of copper liquid, which causes serious heat loss and a large amount of oxygen absorption in the copper liquid, serious slag inclusion during casting, high oxygen content in the product, serious slag formation on the surface, high energy consumption, low yield and high production cost. Moreover, the copper ingots produced in this way need to be ...

AI Technical Summary

Problems solved by technology

This melting and casting method requires frequent pouring of copper liquid. The heat loss of the copper liquid is serious and a large amount of oxygen is absorbed. The slag inclusion is serious during casting.

Moreover, the copper ingots produced in this way need to be reheated to about 900°C for hot rolling in the subsequent processing, and the production cost is high.

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