Honda Giken Kogyo Kabushiki Kaisha

Yasuhiro Nakao

Kunitoshi Sugaya

Hiroto Shoji

Takaharu Echigo

Takashi Kato

Satoshi Matsuura

Takashi Koizumi

Katsuhiro Shibata

Koji Nakamura

Katsuhiro Kitamura

Takeshi Sakuma

Kenichi Kawasaki

Shigehisa Seya

A brake drum includes a ring-shaped drum body, and a friction member secured to the inner circumferential surface of the drum body. Because the drum body is formed of a lightweight Al alloy and the friction member is formed of an Al-base composite material, the brake drum can be reduced in weight as a whole. Further, because the friction member, having projection portions formed on its outer periphery, is cast enveloped by molten metal of the Al alloy, the friction member and the drum body can be firmly fastened together. Thus, even when a great braking force is applied to the drum brake, the friction member can be prevented from being undesirably detached from the drum body.

Brake drum and method for producing the same

A cast-bonding process includes a magnesium coating step and a magnesium nitride-forming step. The magnesium-coating step is carried out by supplying gasified magnesium into a mold in which a cast-in insert formed from an aluminum alloy, or an aluminum-based composite material is set, so that magnesium may coat the insert. The magnesium nitride-forming step is carried out by supplying nitrogen gas into the mold so that the coating magnesium and nitrogen gas may react to form magnesium nitride. Then, a molten aluminum alloy is poured into the mold for cast-bonding the insert.

Method for envelopment casting

An aluminum casting process using a casting mold in which after the cavity () is filled with an inert gas, magnesium is introduced in to the cavity to have a magnesium layer () deposited on the cavity wall. Then, nitrogen gas is introduced into the cavity to form magnesium nitride () on the surface of the magnesium layer after the cavity wall is heated to a specific temperature. Then, molten aluminum is supplied to have an aluminum casting molded, while the surface of the molten aluminum () is reduced with magnesium nitride. This makes it possible to form magnesium nitride within a short time and decrease the amount of nitrogen gas as required.

Method and apparatus for casting aluminum by casting mold

A method of feeding a blank () by cutting a billet () for plastic working includes the steps of superimposing a plurality of annular members (to) having a coefficient of linear expansion smaller than that of the billet and an inside diameter slightly greater than the outside diameter of the billet on one another to assemble a tubular jig (), inserting the billet into the assembled jig, heating the billet and the jig to a temperature at which the billet is half-molten, and cutting the billet into at least one blank by moving the annular members adjacent to one another in opposite directions. The cutting of the billet does not need a cutting tool, thus causing no wear of blades, and thereby allowing reduction in production cost. The billet can be cut into a plurality of pieces at a time, increasing productivity. Since the blanks can be fed together with the annular members, there is no need to reheat the blanks, providing increased productivity.

Blank feeding method

An aluminum casting method includes the step of applying in advance a mold release agent including magnesium to a mold surface. Thereafter, a nitrogen gas is injected into a cavity to cause reaction between the magnesium in the surface of the mold release agent and the nitrogen gas, thereby forming magnesium nitride. Since the nitrogen gas reacts only with the magnesium exposed in the surface of the mold release agent, the forming time of the magnesium nitride is reduced and also the amount of nitrogen gas used is reduced.

Aluminum casting method

A brake drum includes a ring-shaped drum body (), and a friction member () secured to the inner circumferential surface () of the drum body. Because the drum body is formed of a lightweight Al alloy and the friction member is formed of an Al-base composite material, the brake drum can be reduced in weight as a whole. Further, because the friction member, having projecting portions () formed on its outer periphery (), is cast-enveloped by molten metal of the Al alloy, the friction member and the drum body can be firmly fastened together. Thus, even when a great braking force is applied to the drum brake, the friction member can be prevented from being undesirably detached from the drum body.

A method for injection molding a metallic material is disclosed in which an injecting material comprised of a half-solidified metallic material and a molten metallic material is injected into a cavity of a die from an injection cylinder through a gate thereof. A non-product portion remaining at the gate of the die is separated from a product portion while it is still hot. The separated high-temperature non-product portion is press-formed into a billet in the injection cylinder. Utilization of heat from the injecting material in melting the high-temperature billet enables reuse of the non-product portion remained at the gate and reduction of heat energy required in melting the billet.

Apparatus for injection molding metallic materials

A part is manufactured from a composite material containing an aluminum alloy as a metal matrix. Blanks are prepared from a billet of the composite material, and worked on in a press, while they are held at a temperature ranging from the solidus temperature, Ta, of the aluminum alloy minus 50 (Ta&minus;50) deg. C. to Ta deg. C. At a temperature below (Ta&minus;50), the blanks have too high a resistance to plastic deformation to be easily worked on. At a temperature over Ta, a liquid phase is produced and makes the blanks likely to crack easily during plastic deformation.

Process for manufacturing a part of a metal matrix composite material

For forming a preform of composite material, such as aluminum-based composite material (MMC) by using friction during the forming thereof, ceramic reinforcement, such as Al O and binder are prepared, and the prepared reinforcement and the silanor group binder are put into a die for press forming. During the forming, polycondensation occurs due to frictional heat generated between the fibrous or grain-like particles of the reinforcement and the silanor group binder to harden it, thereby obtaining a preform in which the particles of the reinforcement are fixedly connected to one another.

Method for producing a ceramic preform

Method for injection molding metallic materials

The present invention ensures that the warping of an annular disk body of a brake disk, in the direction of a rotational axis, due to a friction heat, is inhibited to a large extent. The brake disk includes an aluminum alloy matrix, a plurality of alumina aggregates dispersed in the matrix, and a plurality of fine alumina grains. The alumina aggregates have an aspect ratio A larger than 1. In an annular disk body, the alumina aggregates are oriented with their lengthwise directions aligned with the radial direction of the disk body.

Rotary friction member, and process for producing the same

A method for manufacturing an aluminum-based composite plate is disclosed. The method comprises the step of producing an aluminum-based composite billet. The billet production step includes reducing, by magnesium nitride, an oxide-based ceramic as a porous molded body. The reduced oxide-based ceramic has improved wettability. An aluminum alloy is then caused to infiltrate into porous sections of the reduced oxide-based ceramic to thereby provide the aluminum-based composite billet. The billet is extrusion molded into a flat plate form by using an extrusion press. Plates of desired shapes are punched from the molded flat plate by using a press.

Method for manufacturing aluminum-based composite plate and composite back plate

For forming a preform of composite material, such as aluminum-based composite material (MMC) by using friction during the forming thereof, ceramic reinforcement, such as Al,O,and binder are prepared, and the prepared reinforcement and the silanor group binder are put into a die for press forming. During the forming, polycondensation occurs due to frictional heat generated between the fibrous or grain-like particles of the reinforcement and the silanor group binder to harden it, thereby obtaining a preform in which the particles of the reinforcement are fixedly connected to one another.

Preform and production method therefor

A formed porous body of oxide ceramic and an aluminum alloy block are placed in a crucible in an atmospheric furnace, and a magnesium source is placed in another crucible in the atmospheric furnace. An argon gas is then introduced into the atmospheric furnace, which is then heated to produce a magnesium vapor from the magnesium source and melt the aluminum alloy block. Then, the argon gas is replaced with a nitrogen gas to generate magnesium nitride. The magnesium nitride reduces an oxide on surfaces of the formed porous body, exposing metal atoms on the surfaces of the formed porous body. The molten aluminum alloy permeates the formed porous body under a pressure lower or higher than the atmospheric pressure or alternate pressures lower and higher than the atmospheric pressure.

Method of manufacturing metal ceramic composite material

Disclosed is a method for producing metal-ceramic composite materials, comprising setting a porous shaped material of an oxide-type ceramic and magnesium in a furnace; establishing a rare gas atmosphere, subliming the magnesium under heat, and dispersing the resulting magnesium vapor into the porous shaped material all within the furnace; introducing nitrogen gas into the furnace, causing the gas to react with the sublimed magnesium to form magnesium nitride (Mg.sub.3 N.sub.2), bringing the magnesium nitride into contact with the oxide in the surface of the porous shaped material thereby reducing the oxide and exposing metal atoms at the material surface, and thereafter infiltrating a molten metal into the porous shaped material.

Growing community of inventors

Sayama, Japan

Yasuhiro Nakao