Hot bulge forming die apparatus
AssigneeHonda Motor Co., Ltd.
InventorsYoshimitsu Ishihara, Daisuke Yamamoto, Takayuki Kanou
Life of this patent
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Abstract
A hot bulge forming die apparatus forms a preheated tubular material 10a into a tubular material 10d. The hot bulge forming die apparatus includes a lower die 21B having a cavity surface 211B and an upper die 31B having a cavity surface 311B. An elongated hole 215 is formed in a circumferential edge portion 215 of the lower die 21B so as to extend outwards, and a projection 315 is formed on a circumferential edge portion 314 of the upper die 31B so as to fit in the elongated hole 215. When the dies are clamped together, the projection 315 formed on the circumferential edge portion 314 of the upper die 31B fits in the elongated hole 215 formed in the circumferential edge portion 214 of the lower die 21B.
Claims2
A hot bulge forming die apparatus for forming a preheated tubular workpiece, comprising:
- a first die having a cavity surface, wherein an elongated hole is formed in a circumferential edge portion of the cavity surface of the first die, and the elongated hole extends in an outward direction;
- and
- a second die having a cavity surface, wherein a projection is formed on a circumferential edge portion of the cavity surface of the second die, and the projection is received in the elongated hole thereby creating circumferential spacing around the projection and allowing for thermal expansion of the first and second die when the first and second die are clamped together, wherein an end of the elongated hole in the outward direction is positioned further outwards than a position where the projection is located when the first die and the second die are clamped together in such a state that the first and second dies are deformed due to thermal expansion, and
- the outer end of the elongated hole is positioned in a position such that the projection is brought into abutment with the outer end of the elongated hole when the first die and the second die are deformed due to an internal pressure therein after the first die and the second die are clamped together in such a state that the first die and the second die are deformed due to thermal expansion.
Dependencies are inferred from the claim text.