一、引言我厂生产的CJ50型摩托车是从日本本田公司引进的产品。该车油箱形状复杂,变形程度很大,底部宽度仅43毫米,整体成形十分困难(见图1)。本田公司原采用左右箱体分别成形后再组焊而成的工艺,不但成本高,并且零件的外观质量差,生产效率低。据分析、研究,认为整体油箱一次成形的关键在于成形过程中中间 I. INTRODUCTION The CJ50 motorcycle produced by our factory is a product imported from Japan Honda. The tank shape complex, a great degree of deformation, the bottom width of only 43 mm, the overall shape is very difficult (see Figure 1). Honda’s original left and right boxes were formed after forming welding process, not only high cost, and the appearance of parts of poor quality, low productivity. According to the analysis and research, the key to shaping the overall fuel tank once is the middle of the forming process