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AssigneeNissan Motor Co., Ltd.
InventorsHiroshi Sakurai, Eizaburou Nakanishi, Shinji Ooe, Masanobu Hayasaka, Junji Katamura
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For forming a tubular work into a shaped hollow product by using hydroforming process, a method and a device are described. In the method, female and male dies are prepared. The female die has a longitudinally extending cavity which has a polygonal cross section when receiving the male die. The tubular work is placed into the cavity of the female die. The interior of the tubular work is then fed with a hydraulic fluid, and the pressure of the fluid is increased to a given level. The given level is smaller than a critical level that causes a bulging of the tubular work. The male die is then pressed against the tubular work to deform the same while keeping the hydraulic fluid at the given level, thereby forming a shaped hollow product that has a polygonal cross section that conforms to that of the cavity. The pressing work is continued until a circumferential length of the shaped hollow product becomes shorter than that of the tubular work.
Method of forming a tubular work into a shaped hollow product by using hydroforming process, comprising:
A device for forming a tubular work into a shaped hollow product by using a hydroforming process, comprising:
A device for forming a tubular work into a shaped hollow product by using a hydroforming process, comprising:
A device for forming a tubular work into a shaped hollow product by using a hydroforming process, comprising:
A device for forming a tubular work into a shaped product by using a hydroforming process, comprising:
Dependencies are inferred from the claim text.