Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Yoshihiro Yamaguchi

Tomiharu Matsushita

Masao Nishihara

Kunihiko Nishioka

Tatsuo Yamasaki

Masataka Noguchi

Hideaki Ide

Yoshiro Yamada

Nobuyuki Nagai

Tatsu Fujita

Takefumi Horiuchi

Atsuo Mizuta

Hiroyuki Murata

Tsugio Kaneda

Rikuo Ogawa

Yasuo Moriguchi

Hiroyuki Morimoto

Shoji Akita

Masataka Noguti

Tadamasa Yokoyama

Masahito Fukuda

Yoshiyuki Monju

Kunio Tsuji

Takashi Shimohata

Sodai Kita

Shunichi Mizukami

Jun Hirose

Yuuzi Nakahara

Yoshihide Fuchino

Tsunesaburo Asada

Sadayashi Furusawa

Shuzi Iwata

Masashi Kawauchi

Akiyoshi Tanabe

Kiyoshi Matsumoto

Kenichiro Ohuchi

Shohei Murakami

Masataka Nogushi

Kouro Takatsuka

A pellet for fabricating a metal matrix composite is made of a mixture of a matrix member of a metal powder and at least one reinforcement selected from whiskers, short fibers and suitable particles, the reinforcement being uniformly distributed in a matrix of the metal powder and said mixture being kept in a shape with a binder, wherein said pellet has a surface layer of dried and rigid portion of said mixture which is rigid enough to keep its shape under an external pressure applied thereto. The pellet is formed from a flat cake of the mixture separated from a slurry consisting of a solution medium and the mixture dispersed therein uniformly. Alternatively, the pellet is formed from the mixture in a dried condition with a granulation binder diluted with a solution medium.

Pellet for fabricating metal matrix composite and method of preparing

A method for producing cold rolled titanium strips having good surface quality. The cold rolling of a titanium strip is carried out under the conditions represented by the following formula:

Method for producing cold rolled titanium strips

A method and apparatus for the controlled cooling of a hot rolled steel rod. A hot rolled steel rod issued from a final stand of mill train is rapidly cooled, and then formed into a coil. The coiled rod is transported in a generally horizontal direction with its loops held at an angle of 30.degree. to 60.degree. relative to the direction of transportation and with a pitch of at least 2d/sin .alpha. where d is a diameter of the rod and .alpha. is the above-mentioned angle. A cooling medium, e.g. air, is forcibly applied to the coiled rod upwardly from below the coiled rod to cool the coiled rod uniformly at such a cooling rate as to achieve a phase transformation to obtain a structure consisting essentially of fine pearlite. The apparatus includes a cooling device for the rapid cooling, a laying head for the coil forming, a conveyor for transporting the coiled rod while supporting its loops at the angle and pitch, a coolant supply, and a mechanism for collecting the treated rod.

Method and apparatus for the controlled cooling of hot rolled steel rods

This invention relates to a free-cutting steel that is used as a material for mechanical construction members be manufactured by machining as well as cold working. There has been proposed resulfurized free-machining steels containing large amounts of sulfur to improve the machinability, as well as resulfurized free-machining steels containing sulfur and zirconium to improve machinability and cold workability. None of these steels, however, simultaneously satisfy the machinability cold workability and mechanical properties required of steels used for the construction of machines. The present invention provides a steel comprising 0.08 to 0.6% of carbon, 0.35% or less of silicon, 0.3 to 1.5% of manganese, 0.04 to 0.15% of sulfur, 0.010 to 0.05% of aluminum, 0.01 to 0.08% of niobium, 0.008% or less of oxygen, 0.008% or less of nitrogen, wherein the amount of zirconium being 0.2 to 1.2 in terms of (Zr% -2.9x 0% -6.5x N%)/S%, the steel has a refined grain size and controlled sulfide morphology, and exhibits improved machinability, cold workability and mechanical properties.

Grain refined free-machining steel

A die for use in a hot hydrostatic extrusion process, in which a billet comprised of aluminum or an aluminum alloy or a billet having aluminum and an aluminum alloy at its outer periphery is preheated and charged into a container whereupon extrusion is carried out by means of a pressure medium, said die comprising a plurality of stepped conical portions serving as approach portions to the die outlet; said conical portions having conical surfaces whose opening angles increase from the inlet of the die toward the outlet thereof, said conical surface which is closest to said inlet having an opening angle of less than 60 degrees, and the difference between the opening angles between adjacent conical surfaces being less than 90 degrees.

Extrusion die for hot hydrostatic extrusion of aluminum and aluminum

A method and machine for use in hydrostatic extrusion wherein a portion of an elastic-plastic viscous pressure medium is introduced into the rear portion of a container, with the rear end thereof being sealed in a fluid tight fashion. The pressure medium being of such a nature that it has a high viscosity and cannot flow by itself. Subsequently, a billet is charged into the container and then a die is mounted in the container at the forward end thereof. The aforesaid pressure medium is caused to fill around the outer circumferential surface of the billet. In this respect, a high pressure seal is provided for the junctions between the die and the forward end of the container and between the die and the forward end of the billet before the pressure medium flows out of the container in a practically negligible small amount, immediately after which a pressure stem is pushed into the container from the rear end thereof, thus proceeding with the hydrostatic extrusion.

Machine for use in hydrostatic extrusion

A hydrostatic extrusion method and apparatus for the extrusion of tubes is disclosed wherein the simplified structure of the nose or tip portion of the billet and the cooperating surfaces of the die defining the die cavity and those of the mandrel facilitate an improved initial sealing among the associated surfaces of the die, billet and mandrel. Such an initial sealing is effected between such interfaces of the members and billet at a point which is located substantially rearwardly from the position at which the actual extrusion to the final tubular configuration occurs between the bearing portion of the die and the cooperating sizing portion of the mandrel. Such structure and method permits the extrusion of tubes having walls of asymmetric or non-circular configurations in cross section, even those of complex configurations. In order to further enhance the efficacies of the present invention, the mandrel is provided with a head portion which may be replaced, or exchanged as desired, and a position-aligning member is associated with the mandrel in order to maintain the proper orientation of the mandrel relative to the die. The mandrel may also have a specifically designed configuration in order to provide the inner surface of the tube extruded with a gloss finish.

Hydrostatic extrusion method and apparatus

Method and machine for use in hydrostatic extrusion

In the manufacture of compound billets composed of two or more different metals for use in hydrostatic extrusion, care must be exercised to see whether or not products possessing a predetermined compound status are produced from the compound billets by means of the hydrostatic extrusion process. The compound billets manufactured through the method of this invention do not, in the hydrostatic extrusion process, possess the usual defects caused by discrepancies between the mechanical properties of a plurality of different metallic materials constituting the billets, especially, and in particular, it is true that the compound billets are free from defects caused by surface slip taking place between the surfaces of the internal and external layer materials of the compound billet of the different metallic materials, and the method according to the present invention is characterized in that the formation of the nose part is undertaken by plastic forming of the same, such as roll forming and swazing, from the outside while maintaining an interior condition wherein air is expelled from the space formed between the contacting surfaces of the different metallic materials. As a result, the materials are mechanically bonded together and the surface areas of the materials of the billet at the deformed nose portion to be presented to the die are equal and it becomes possible to carry out a hydrostatic extrusion of the compound materials under a combination of different metallic materials covering an extremely wide selection.

Method of manufacturing compound billets for hydrostatic extrusion

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Ashiya, Japan

Yoshihiro Yamaguchi