| 摘要 |
PROBLEM TO BE SOLVED: To reduce a forming load and improve forming accuracy in a boss forming method using flow forming. SOLUTION: A forming roller 20 is pressed against one side face of a plate-like work W, which is rotated being pressed and held by a support 10. A boss part Wa is formed at the central part of the work by making a projecting edge 21 of the roller 20 bite the work and moving the edge 21 radially inwardly toward the side of a mandrel 11, which is disposed coaxially with the support 10, to flow out the material of the work. The projecting edge of the forming roller is brought close to the mandrel by a prescribed distance, and then the forming roller is moved in the axial direction of the mandrel, so that the material flown out by the projecting edge is pressed against the outer peripheral face of the mandrel and the outer peripheral face of the boss part is formed. On the forming roller, a boss-part forming face 22, which continues from the projecting edge and has a nearly conical face, is formed. The mandrel-side tilt angle of the bus of the boss-part forming face is preferably larger than the moving-direction tilt angle of the forming roller in the axial direction of the mandrel. COPYRIGHT: (C)2005,JPO&NCIPI
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