Copper strip cover annealing technology

Abstract

A copper strip bell-type annealing process disclosed by the present invention comprises the following steps: a. put the copper strip roll into the annealing furnace to evacuate, and then fill it with nitrogen; b. carry out segmental heating to the inner cover through the heating mantle , where the first stage uses a heating rate of 120°C / h, heating until the temperature of the copper strip reaches 180°C, and the second stage uses a heating rate of 75°C / h to heat the copper strip temperature to 250°C; c, heat it to the annealing temperature and then keep it warm 5h; d. After the heat preservation is over, replace the heating cover with a cooling cover, and cool it to 74°C in the form of air cooling first and then water cooling. The fan speed in the air cooling stage is 1100r / min, and the furnace is continuously filled with nitrogen in the cooling stage. ; e. After cooling, open the inner cover for unloading. The invention simplifies the process steps, shortens the annealing time and improves the production capacity.

Description

technical field [0001] The invention relates to a copper strip cleaning process, in particular to a copper strip mask annealing process. Background technique [0002] The copper strip material needs to be annealed multiple times during the processing process, which mainly has two basic functions, one is to eliminate the hardening and residual stress generated during the processing, soften the material, improve the plasticity, and facilitate further processing; the other is to change the structure of the material, To obtain the required grain size and grain orientation, bell furnace annealing is currently one of the commonly used methods in copper strip processing. [0003] The annealing of the existing bell furnace adopts the method of heat radiation and heat conduction to transfer heat from the outside to the inside. In order to avoid the influence of the performance of the copper strip caused by the large temperature difference between the inside and outside of the copper ...

AI Technical Summary

Problems solved by technology

[0003] The annealing of the existing bell furnace adopts heat radiation and heat conduction to transfer heat from the outside to the inside. In order to avoid the influence of the performance of the copper strip caused by the large temperature difference between the inside and outside of the copper strip, the temperature in the furnace is usually raised slowly at a fixed heating rate. The temperature rises, which makes the annealing cycle very long. Generally, the annealing cycle of the bell furnace is as long as 22 hours. Facing the increase in the output requirements of copper strip manufacturers, how to increase the production capacity is an urgent problem to be solved.

[0004] In addition, the bell annealing furnace needs to be filled with gas for protection. Usually, the protective gas is filled before annealing. Vacuuming operation for one time, the overall process is cumbersome, and the annealing time is prolonged