Metal core for notch press molding of headrest stay

摘要

PPROBLEM TO BE SOLVED: To provide a core capable of forming a notch for adjusting the head rest height even in a pipe member consisting of an electric welded tube with a weld bead present therein, and consistently press-forming the notch to a desired groove shape by a simple groove structure. PSOLUTION: In the core for notch press forming of a head rest stay, while arc-shaped supporting faces 1 and 2 of the same diameter as the inside diameter R of a tubular member P leading to both sides via the longitudinal center line LSB1/SBof the tubular member P forms a top part and a bottom part, both notched faces 3 and 4 inclined from both ends 1a and 1b of the supporting faces 1 and 2 and intersected at the transverse center line LSB2/SBof the tubular member P form run-off parts while maintaining angles SB1/SBand SB2/SBin the outward of the perpendiculars 1SB1/SBand 1SB2/SBwith both ends 1a and 1b of the supporting faces 1 and 2 as a standard by 15. Recessed grooves 5SB1/SB-5SB4/SBare formed at least in the supporting face 1 of the top part 1, in which an arc-shaped face of the radius rSB2/SBsubtracting the projecting dimension rSB1/SBof a recessed part X from the radius R of the tubular member P forms a bottom face 5a leading to both notched faces 1 and 2. PCOPYRIGHT: (C)2005,JPO&NCIPI