摘要
微拉深是一种高效加工开口型薄壁零件的工艺方法,但由于尺度的减小,常规拉深工艺的材料和模具无法满足微拉深的要求。采用5 mm×10 mm凸模对厚度100、200μm的SUS304薄板进行了微拉伸试验,对拉深试样进行了镶嵌打磨,测量其剖切面厚度减薄率分布以及关键部位厚度方向的微硬度分布。结果发现微盒形件最大减薄发生在凸模圆角附近,厚度减小,薄板减薄分布不均匀性增加;凸模圆角部位发生明显的加工硬化现象。试样厚度减小,圆角部位厚度中心层低硬度区现象减弱。即薄板厚度减小,拉深成形中的变形协调条件减弱,变形不均匀性增加,成形能力下降。
Micro-deep drawing is a highly effective method for processing open thin-walled parts. However, due to the decrease of the size, the materials and dies of conventional drawing process can not meet the requirements of micro-deep drawing. The micro-tensile test of SUS304 sheet with thicknesses of 100 and 200 μm was carded out by using punch die with 5 mm×10 mm. The drawing sample was inlaid and polished. The distribution of the thickness thinning rate on section and the micro-hardness distribution of key parts in the thickness direction were measured. It is found that the maximum thinning of the micro-box parts occurs near the comer of the punch die, the thickness decreases, and the unevenness of sheet thinning increases; there is an obvious work-hardening phenomenon at the fillet of the punch. When the thickness of the sample decreases, the low hardness zone in fillet thickness center layer weakens. That is to say, the thickness of thin sheet decreases, the deformation coordination condition in deep drawing is weakened, the deformation nonuniformity increases, and the forming ability decreases.
出处
《热加工工艺》
CSCD
北大核心
2017年第21期148-151,共4页
Hot Working Technology
基金
江苏大学工业中心创新实践基金支持项目(ZXCXJJ201404)
关键词
微拉深
盒形件
微硬度
减薄率
micro-deep drawing
box shaped parts
micro-hardness
thinning rate
