| 摘要 |
PURPOSE:To give necessary strength partially and reduce manufacturing cost, by plastic working a material having work hardening characteristic and high elongation percentage, and counter pressing the part where strength is required. CONSTITUTION:Four frame joints 1 are plastic worked by one forming, then formed by drawing and cut along cutting lines 5, 6. Dies 9 for double pressing are inserted into dies 14, 15 for plastic working, and the cut joint 1 is press worked. After plastic working, the double pressed face 7 of the joint 1 is counter pressed with pressure P using another die 8. By counter pressing the flange 1 using the die 8 or 9, strength can be increased. |
