| 摘要 |
PROBLEM TO BE SOLVED: To provide a drawing device for tubular workpieces, with which seizure of the outside surface of the tubular workpiece with a drawing die is prevented. SOLUTION: The drawing device 10 includes a drawing die 20 and a drawing plug 30. The drawing die 20 includes: a first curved surface 1C from which the workpiece 40 is separated while a diameter contracting work is applied, a die bearing part 2B which is arranged in the inside and on the downstream side of the workpiece separating position K in the first curved surface 1C and a guide part 2D having a second curved surface 2C which ranges to the upstream end F of the die bearing part 2B smoothly. The radius R21 of curvature of the second curved surface 2C is set larger than the radius R1 of curvature of the first curved surface 1C. The guide part 2D guides the workpiece 40 to the die bearing part 2B while performing the diameter contracting work of the workpiece by being brought into contact again with the workpiece 40 which is separated from the first curved surface 1C. The drawing plug 30 is provided with a plug bearing part 3B which is shorter than the length L4 of the die bearing part 2B. COPYRIGHT: (C)2011,JPO&INPIT |
