Honda Giken Kogyo Kabushiki Kaisha

Honda Giken Kabushiki Kaisha

Akio Hidaka

Teruoki Watanabe

Shunji Kobayashi

Tadao Kanno

Masahiro Inoue

Hiroyoshi Nozaki

Shigeo Kaiho

Masuo Ebisawa

Shigemitsu Nakabayashi

Akio Kawase

Takeshi Sakuma

Akihiro Okumura

Tsutomu Terajima

Yuu Haga

Yahiko Nakamura

Nobuaki Takatori

The lower mold which forms the external side of the vehicle wheel is water-cooled by water-cooling pipes. The rib-forming portions of the upper mold which forms the internal side of the vehicle wheel are forcibly air-cooled by the air passages provided along the rib-forming portions. Since water-cooling has better cooling capacity than air-cooling, the molten material inside the cavity between the lower mold and the upper mold is solidified from the external side thereof, and no defects such as shrinkage cavities occur on the external side thereof. When the internal side is solidified, the rib portions are solidified not much later than the other portion of the internal side, thereby shortening the casting cycle time. The split molds which form the cavity for forming therein the rim portion of the vehicle wheel are opened earlier than the upper mold, at the time when the surface layer portion of the molten material in the cavity has been solidified. If the split molds are kept clamped, the clearance to be generated between the split molds and the molten material upon contraction thereof due to solidification, restricts the heat dissipation from the molten material to the split molds, resulting in retarded solidification. To the contrary, early opening of the split molds leads to accelerated solidification of the molten material due to cooling of the rim portion by the atmosphere.

Method of casting vehicle wheel

A process for casing a fiber-reinforced metal body by placing a shaped fibrous article made of a reinforcing fiber into a cavity in a casting mold and filling a molten metal into the shaped fibrous article to solidify it, the process further including the steps of pouring the molten metal into the cavity from the lower portion thereof, while venting gas present within the cavity through a gas vent passage having a very small opening communicating with the upper portion of the cavity, and closing the gas vent passage and completely solidifying the molten metal under a higher pressure.

Process for casting fiber-reinforced metal body

A paint priming method which forms, on the surface part of a ferrous material to be treated, a nitride layer with an adequate depth and preferably .epsilon. phase as a main phase thereof, and with no carbon adhesion to the surface thereof, by carrying out a gas soft nitriding treatment with gas components which generate no free carbon. The nitride layer formed on the surface part of the material is used as a presubstrate on which direct painting is possible, thereby providing a simplified and improved presubstrate treatment for painting.

Method of presubstrate treatment for painting utilizing a gas soft

A method for continuously treating an iron member wherein the iron member is first subjected to furnace-brazing in a controlled gas environment and subsequently to a soft-nitriding treatment by addition of ammonia gas (NH.sub.3) to the controlled gas for the brazing. An apparatus for carrying out the method is also provided, and includes three partitioned chambers for brazing, annealing and soft-nitriding the iron member, each chamber being partitioned by a member such as a stainless steel film curtain at opposite sides thereof. A controlled gas feed system communicates with each of the chambers, and an ammonia gas feed system is connected to the soft-nitriding chamber.

Method and apparatus for the continuous furnace brazing and gas

Method and apparatus for the continuous furnace brazing and

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Kawagoe, Japan

Akio Hidaka