Sumitomo Metal Industries, Inc.

Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Sumitomo Precision Products Co., Ltd.

Sumitomo Pipe & Tube Co., Ltd.

Takeda Pharmaceutical Company Limited

National Cerebral and Cardiovascular Center

Masayasu Kojima

Chihiro Hayashi

Saburo Inoue

Kenji Mori

Atsushi Tomizawa

Kenji Kangawa

Tetsuo Abiko

Keiji Miki

Mitsutoshi Uchida

Mikiya Miyazato

Ken Tomiyasu

Kenji Ikisima

According to a bulging device and a bulging method using a profile element pipe, for example, even when a profile steel pipe having a cross sectional shape varying in the axial direction as in a tapered pipe is hydraulically bulged, a bulging in which an internal pressure loading and an axial pressing are combined with each other can be performed to provide a larger expansion ratio than a conventional case and a joining and socket connection thereof to the other part can also be easily performed.

Profile element pipe for hydraulic bulging, hydraulic bulging device using the element pipe, hydraulic bulging method using the element pipe, and hydraulically bulged product

A sheet hydroforming method is disclosed wherein two stacked metallic sheets are clamped between a pair of upper and lower dies and a fluid is introduced and pressurized between mating surfaces of the metallic sheets, causing the metallic sheets to bulge into a space defined by die cavities and A thru-hole for introducing the fluid is formed in one of the dies so as to lead to a holding surface of the die, while a pierced hole for introducing the fluid is formed in one of the metallic sheets in a portion of the one metallic sheet which portion is in contact with a holding surface ( ) of one of the dies, the pierced hole being positioned with the thru-hole then the fluid is introduced in a pressurized state between mating surfaces of the metallic sheets from the thru-hole through the pierced hole, thereby causing the metallic sheets to bulge. According to this method, a pressurized fluid can be introduced between the mating surfaces of blanks easily without leakage of the fluid. Not only the efficiency of the sheet hydroforming method but also the dent resistance of a formed part can be improved.

Metallic sheet hydroforming method, forming die, and formed part

A method for hydroforming a metallic tube comprising primary hydroforming and secondary hydroforming, wherein in the primary hydroforming step, the metallic tube is formed such that a circumferential length of an expanded portion of the primary-hydroformed tube as measured at a wall center region of the expanded portion becomes substantially equal to or slightly shorter than a circumferential length of an expanded portion of a product as measured at a wall center region of the expanded portion, and in the secondary hydroforming step, movable forming plates incorporated in the dies press the expanded portion formed through primary hydroforming so as to finish the cross-sectional profile of the expanded portion into that of the expanded portion of the product, and said primary hydroforming and secondary hydroforming are continuously performed within the dies. Also disclosed is an apparatus for performing the hydroformation method. According to the method of the present invention, high liquid pressure is not required, and reduction in wall thickness and shape defects can be prevented.

Method and apparatus for hydroforming metallic tube

A method for hydroforming a metallic tube comprising primary hydroforming and secondary hydroforming, wherein in the primary hydroforming step, the metallic tube is formed such that a circumferential length of an expanded portion of the primary-hydroformed tube as measured at a wall center region of the expanded portion becomes substantially equal to or slightly shorter than a circumferential length of an expanded portion of a product as measured at a wall center region of the expanded portion, and in the secondary hydroforming step, movable pads incorporated in the dies press the expanded portion formed through primary hydroforming so as to finish the cross-sectional profile of the expanded portion into that of the expanded portion of the product, and said primary hydroforming and secondary hydroforming are continuously performed within the dies. Also disclosed is an apparatus for performing the hydroformation method. According to the method of the present invention, high liquid pressure is not required, and reduction in wall thickness and shape defects can be revented.

A lubricant surface-treated steel pipe for hydroforming use in which at least its outer surface is coated with a lubricating organic resin to a thickness of 0.5 .mu.m to 100 .mu.m. The surface-treated steel pipe provides excellent prevention of galling and excellent lubrication in hydroforming. Also, hydroforming can be started immediately after the surface-treated steel pipe is cut into short pieces.

Lubricant surface-treated steel pipe for hydroforming use

A method and apparatus for hydroforming a metallic tube including the steps of: preliminarily expanding the metallic tube over an axial section longer than the length of the expanded portion of a final product as measured in the axial direction of the metallic tube; and compressing the preliminarily expanded portion in the axial direction of the metallic tube so as to form the shape of the expanded portion of the final product. According to the method and apparatus of the invention, frictional resistance between the metallic tube and processing tools can be reduced, and moreover, the internal pressure within the metallic tube can be reduced during expansion processing. Furthermore, the cost for the manufacture of metallic die is reduced, and in addition, yield is improved

A heat sink fin assembly of the corrugated type for cooling an LSI package comprises a flat base plate and a heat dissipating member made of a thin metal sheet having convex and concave portions which are comprised of a repeated series of side wall portions, top portions, and bottom portions. The base plate and the heat dissipating member are integrated with each other by bonding.

Heat sink fin assembly for cooling an LSI package

A fin assembly for use as a heat sink and production thereof are disclosed. The fin assembly comprises a plurality of heat dissipating plates formed by means of a multi-wire saw, and the heat dissipating plates each has a thickness of no more than 1 mm and being spaced apart by a gap of no more than 1.5 mm.

Process for producing a heat sink fin

A fin assembly for use as a heat sink and production thereof are disclosed. The fin assembly comprises a plurality of heat dissipating plates formed by means of a multi-wire saw, and the heat dissipating plates each has a thickness t of no more than 1 mm and being spaced apart by a gap g of no more than 1.5 mm the heat dissipating plates or pins having a height h, wherein the ratio h/t is not less than 20 and the ratio h/g is not less than 15 in one embodiment and 19 in another embodiment of the invention.

IC package heat sink fin

A method of producing a laminated metal belt with a space corresponding to the thickness of resin between respective ring belts by a step for forming a laminated sheet by bonding the number of metal sheets corresponding to the number of ring belts constituting the laminated metal belts of one unit with resin, a step for forming a seamless cylindrical body having predetermined inside and outside diameters from the laminated sheet, a step for cutting the cylindrical body radially into sections to obtain laminated rings and a step for removing resin from the laminated ring.

Method of producing laminated metal belt

A metal case for housing electronic parts including an IC and a manufacturing method therefor are disclosed. The case comprises a shallow vessel having a wall on its periphery which is formed from metal sheet having the same thickness as the bottom of said depression and a rectangular metal ring which has a contour such that it can fit into the wall of said shallow vessel, said rectangular metal ring being fit into said shallow vessel and connected thereto so as to form a single body.

Growing community of inventors

Takarazuka, Japan

Masayasu Kojima