用黄铜板带材引伸生产罩盒时,为了消除加工硬化,提高塑性,需要经一次或多次中间退火。当使用空气电阻炉加热退火时,常生成黑色氧化皮而影响工件的表面质量。人们通常认为这是无保护气氛加热引起的过氧化,于是纷纷采用保护气氛加热,这便增加了热处理的费用。我们通过摸索认为,这种缺陷的产生不但与退火工艺有关,还与来料的表面质量以及引伸时使用的 With the brass plate strip extension production housings, in order to eliminate work hardening and improve plasticity, need to be after one or more intermediate annealing. When using air resistance furnace heating annealing, often generate black oxide skin and affect the surface quality of the workpiece. People generally think it is unprotected atmosphere heating caused by peroxidation, so have adopted a protective atmosphere heating, which increases the cost of heat treatment. We find through exploration that this defect is not only related to the annealing process, but also with the incoming surface quality and extension of the use of