As a result, proper loading paths are determined.It is pointed out that asymmetric back force can improve the material flowage in the middle zone around the bus-bar of the branch tube.

• 增厚区域主要在枝管过渡圆角部位和主管两端，非对称反向压力可以改善枝管贯通母线中心附近区域材料的流动。