| 摘要 |
PROBLEM TO BE SOLVED: To prevent the tumble of an outer cylinder flange at the time of drawing of a bushing, to improve the dimensional accuracy and attaching works, and to enhance the adhesiveness and durability. SOLUTION: A drawing jig for a bushing is composed of a first jig portion 9 provided with a hole 6 to admit insertion and hold the bushing 5 formed by arranging an inner cylinder 2, resilient member 3, and outer cylinder 4 concentrically in this adder from the inside and a taper 7 on the peripheral surface and consisting of a split body 8 divided in a plurality of segments about the axial direction of the hole 6 and a second jig portion 12 having a taper 11 on the inside surface of a hole 10 and drawing the diameter of the outer cylinder 4 by moving the split body 8 in the radial direction in cooperation with the taper 7 on the first jig 9, wherein the second jig 12 is furnished with a stopper 13 to hinder movement of the inner cylinder 2 of bushing 5 held by the first jig 9 at the time of the diameteric reduction of the outer cylinder 4. Therefore the movement of the inner cylinder 2 is suppressed in the drawing process so that the adhesiveness and durability are enhanced, and the dimensional accuracy is improved to eliminate dispersion in the attaching work. A uniform drawing is achieved if the drawing is performed in the condition that the forefront 23a of the upper flange of the outer cylinder 4 is allowed to abut on a notch 9a formed in the trunk of a drawing piece, and there is no risk that the forefront of the flange tumbles.
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