Through the analysis of the structure and technological process of the bottom crossband, a reasonable process for bending the pipe nip of the bottom crossband was determined.

• 通过对下横条的结构与工艺分析,确定了下横条管夹弯曲的合理的工艺方案,并设计了能够同时弯直边和弯管夹的模具,提高了生产效率,降低了生产成