| 摘要 |
PURPOSE:To attain a simplification of manufacture and cost down for a seat lug with a collar pedestal by forming a swelled out projection by performing a hydraulic bulge forming, and thereafter obtaining a final product by performing a secondary work at a projection forming a pedestal. CONSTITUTION:A metallic raw material tube is inserted to a segmental die provided with recessed part corresponding to projections 3, 4 to be bulged out and thereby a raw material tube 2 having the desired projections 3, 4 is obtained by means of a hydraulic forming. At the secondary working, the end of the projection 3 is finished to an opening 3a with a special form, and after the end of the projection 4 is finished to a pedestal 4a, an upright cylinder 5 is fixed to the pedestal 4a by welding. And the pedestal 4a with the cylinder 5 fixed, is slitted to form both ears 7a, 7b. In consequence, the simplification of the manufacture and the cost down for the seat lug with a collar pedestal for an automobile is made feasible.
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