| 摘要 |
PROBLEM TO BE SOLVED: To improve productivity while restraining occurrence of a crease and a crack in press molding by making a shape of a positioning reference part formed in a body part of a funnel and a property of its outside surface appropriate, and to reduce weight while eliminating difficulty of work at the same time. SOLUTION: Outside surfaces of ends on both side in the width direction of at least a reference surface 7a of the positioning reference part 7 and a connection part 7c thereof from an end on the side of a small opening end 3 to an outside surface 4c of the body part 4 are left in a press-molded state; a connection line C continuing by gradually approaching the outside surface 4c of the body part 4 from the end on the small opening end 3 side of the reference surface 7a comprises a projecting curved line C1, an intermediate line L1 and a recessed curved line C2; a straight line LA connecting a connection point J2 between the projecting curved line C1 and the intermediate line L1 and a connection point J3 between the recessed curved line C2 and the intermediate line L1 is inclined at an angleθ1 of 2°to 25°with respect to a surface vertical to a tube axis Z. COPYRIGHT: (C)2006,JPO&NCIPI
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