Abstract
Automobile parts such as welding nuts, slave and w-gear are produced by cold forging in Nichiwa Co. Ltd.. The products (with complex shape) are usually formed through forging stage of 5 to 6. So, the die designs in respective forging stage are needed. The work takes much time and it is very difficult to determine respective die dimensions in order that products with high precision can be obtained. In this study, the design system for multi-stage dies in cold forging was developed, and then the design system was applied to an automobile part with flange. From the result, it was found that the product with good configuration in each forging stage could be obtained using this design system. It was also possible to design them in short time in comparison to previous working time.
