辊型参数对316L极板连续流道辊压成形的影响

Influence of roll profile parameters on continuous flow channel rolling for 316 L pole plate

设计了辊压成形工艺制备氢燃料电池金属极板流道的辊型,并对316L不锈钢极板流道进行辊压成形过程的数值模拟,将最大减薄率、最大深度偏差率作为评价指标,分析凸模高度、宽度、拔模角及圆角半径等辊型参数对极板流道成形的深度和厚度的影响规律。结果表明:凸模高度由0.30 mm增加至0.40 mm时,金属极板流道的最大等效应力增大,最大减薄率增大,最大深度偏差率减小;凸模宽度由1.6 mm增加至1.8 mm时,金属极板流道的最大等效应力减小,最大减薄率减小,最大深度偏差率增大;凸模圆角半径由0.15 mm增加至0.25 mm时,金属极板流道各评价指标均减小;凸模拔模角由15°增大至25°时,金属极板流道各评价指标均减小。采用极差分析法发现凸模圆角半径是影响极板流道辊压成形的主要因素,并对不同凸模圆角半径的流道进行了实验验证。

The roll shape for the metal pole plate flow channel of hydrogen fuel cell which was prepared by the rolling process was designed,and the rolling process of 316 L stainless steel pole plate flow channel was numerically simulated.Then,taking the maximum thinning ratio,the maximum depth deviation ratio as evaluation indexes,the influences of roll shape parameters,such as punch height,width,draft angle and fillet radius on the depth and thickness for the forming of pole plate flow channel were studied.The results show that when the punch height increases from 0.30 mm to 0.40 mm,the maximum equivalent stress and the maximum thinning rate of metal pole plate flow channel increases,and its maximum depth deviation rate decreases.When the punch width increases from 1.6 mm to 1.8 mm,the maximum equivalent stress and the maximum thinning rate of metal pole plate flow channel decreases,and its maximum depth deviation rate increases.When the fillet radius of punch increases from 0.15 mm to 0.25 mm and the draft angle of punch increases from 15°to 25°,all evaluation indexes of metal pole plate flow channel decrease.In addition,using the range analysis method,it is found that the fillet radius is the main factor affecting the rolling of pole plate flow channel,and the experiment verification for the flow channels with different fillet radiuses of punch is carried out.