Chuetsu Metal Works Co., Ltd.

Other

Oiles Corporation

Kunio Nakashima

Wataru Yago

Masao Hosoda

Takayuki Tanaka

Kenzo Yamamoto

Kazuyuki Inagaki

Atsushi Yasukawa

Hiroyuki Saito

Yasuhiro Sato

Mitsutoshi Kato

Ryoichi Ishigane

Yutaka Ichitani

Ryouichi Ishigane

Kenichi Ichida

Ken-ichi Ichida

Takashi Nakamaru

Kazuo Takeuchi

Shigeyuki Aburatani

Kunihiro Uraki

Kenji Sugiyama

Satoshi Takamura

Sumiko Sanuki

Hideki Yoshimura

Yukinori Ikemiya

A synchronizer ringhas an annular ring body; a friction materialjoined integrally to a cylindrical inner peripheral surfaceof the ring body; a conical surfaceformed on an inner surface of the friction material; and a plurality of annular groovesformed in the conical surfaceof the friction material

Synchronizer ring

A lead-containing copper-based alloy is immersed into a weak acidic or neutral etching solution having a buffer effect which is formed by adding an organic acid into a complexing agent having a high ability to form a complexing ion with lead, and lead particles present on the surface of the lead-containing copper-based alloy are then removed. The complexing agent is one of an organic ammonium salt such as ammonium acetate, or ammonium citrate, or may be an organic sodium salt such as sodium acetate, sodium tartrate, and sodium citrate. Preferably, an immersion temperature of the alloy to the etching solution falls within a range of from 10 to 50&#xb0; C. The etching solution is agitated with oxygen or a gas containing oxygen blown thereinto during the immersion of the alloy into the etching solution. An extremely low voltage of &#x2212;0.3 to +0.2 V vs. NHE is applied from outside to the lead-containing copper-based alloy as an anode.

Method for preventing lead from dissolving from a lead-containing copper-based alloy

In an air passage switching door, a packing material having a size approximately corresponding to a plate surface of a door base member is used, and the door base member is crossed with the packing material at a portion around a rotation shaft for rotating the door base member, so that both plate portions of the door base member are bonded to opposite surfaces of the packing material at different areas of the packing material. Accordingly, the air passage switching door can be manufactured using the single packing material.

Method for manufacturing an air passage switching door

In an air passage switching door, a packing material having a size approximately corresponding to a plate surface of a door base member is used, and the door base member is crossed with the packing material at a portion around a rotation shaft for rotating the door base member, so that both plate portions of the door base member are bonded to opposite surfaces of the packing material at different areas of the packing material. Accordingly, the air passage switching door can be manufactured using the single packing material in low cost, while having a reduced thickness.

Air passage switching door

A cutting-free bronze alloy which is substantially free of lead contains 1 to 13 wt. % of tin, not larger than 18 wt. % of zinc, 0.5 to 6 wt. % of bismuth, 0.05 to 3 wt. % of antimony, not larger than 1 wt. % of phosphorus, less than 0.4 wt. % of lead, and the balance being copper. The alloy may further contain 0.1 to 3 wt. % of nickel. When 3 to 8 wt. % of tin and 6 to 10 wt. % of zinc are present, the alloy is particularly suitable for use as a plumbing faucet and fixture. Likewise, when 8.5 to 13 wt. % of tin and not larger than 1 wt. % of zinc are present, the alloy is suitable for use as a sliding member.

Cutting-free bronze alloys

In a synchronizer ring that is a part of an automobile transmission, a ring body is made of an iron material and a sliding member is made of a wear-resistant copper alloy having the following chemical components, matrix and rigidity, characterized in that the ring body and sliding member are bonded to each other by way of hot working. (1) a wear-resistant copper alloy containing Zn of 22 to 45 wt %, at least one kind of metal elements of 0.1 to 15 wt % which are selected from a metal element group of Al, Mn, Fe, Pb, Ni, Be, Si, Co, Cr, Ti, Nb, V, Zr, Mo, Sn, Bi, B etc. and the remnant composed of Cu and impurities. (2) The wear-resistant copper alloy has a matrix of .alpha. phase+.beta. phase, .beta. phase alone or .beta. phase+.gamma. phase. (3) HRB (Hardness Rockwell B) value is more than 80. As a result, it is possible to provide a high performance composite-material synchronizer ring capable of sufficiently withstanding a high load since it comprises a ring body made of an iron material which is superior in rigidity and strength and a wear-resistant copper alloy material bonded to the sliding surface side of the ring body by way of hot working such as hot forging and the like.

Method of connecting a sliding member to a synchronizer ring

A mold for continuous casting comprises a copper or copper alloy mold substrate and a sprayed coating film formed on non-blasted inner surfaces of the substrate with or without a metal plated skin layer provided between the substrate and the film. For the formation of the sprayed coating film, particles of at least one tungsten carbide-based wear-resistant material having a particle size of from 5 .mu.m to 53 .mu.m and having a hardness capable of anchoring in the inner surfaces of the substrate are subjected to high pressure/high velocity oxygen fuel coating under conditions where the particles remain at least partially non-fused on application of heat from a spraying flame. By this, a layer directly anchored in the inner surfaces of the substrate or in the skin layer, if present, is formed at least as one layer of the sprayed coating film formed in a total film thickness of from 0.01 to 6 mm. No thermal fusing treatment is necessary since the bonding between the substrate or skin layer and the layer is strong.

Mold for continuous casting which comprises a flame sprayed coating

A synchronizer ring comprises a ring body having a sliding portion, and a directly spray-coated wear-resistant film formed on a surface of the sliding portion. The film is made of a wear-resistant brass alloy which comprises Cu, Zn and at least one element selected from the group consisting of Al, Mn, Fe, Ni, Si, Co, Cr, Ti, Nb, V, Zr and Mo. The spray-coated film exhibits good wear resistance and good bonding strength.

Syncronizer ring having a spray-coated film of a wear-resistant brass

A wear-resistant copper alloy which consists essentially of 56 to 65 wt. % of Cu, 28 to 32 wt. % of Zn, 3.5 to 5.5 wt. % of Al, 0.5 to 2.0 wt. % of Fe, 1.0 to 3.0 wt. % of Ni, 0.1 to 1.0 wt. % of Nb, and 0.4 to 1.5 wt. % of Ti, provided that Ti+Nb is equal to or greater than 0.7 wt. %. The alloy includes two discrete intermetallic compounds comprising Ti-Ni-Fe-Al and Nb-Fe-Al uniformly dispersed in a microstructure preferably including at least 50 volume % beta phase and limited alpha and gamma phases. A synchronizer ring made of the copper alloy is also provided.

Wear-resistant copper alloys and synchronizer rings for automobiles

A Mn-Si-Co-Fe-based high-strength brass alloy comprises, on the weight basis, 15 to 25% of Zn, 1.0 to 5.0% of Mn, 0.3 to 2.0% of Si, 0.01 to 0.5% of Fe, 0.01 to 2.0% of Co, 0.2 to 1.0% of Sn, 5 to 10% of Pb and the balance being Cu and inevitable impurities. The alloy has a novel intermetallic compound [Mn,Si,Co,Fe] substantially in the form of spheroids and has also fine grains. The alloy is adapted for use as sliding members or parts and has very good resistances to wear and corrosion, anti-seizing property and durability.

High strength .alpha. brass containing Mn, Si, Co, Fe, Sn and Pb

A water-cooled copper casting mold comprising a copper plate, a back frame which is fastened to the copper plate to thereby form cooling channels in which widths of main channels in the bolt fastening region are wider than those in other regions, characterized in that the water-cooled copper casting mold further comprises increased channels which are formed between right and left main channels in the bolt fastening region excluding bolt screwing halls, branch channels which are provided between the main channels and the increased channels wherein at least one of the branch channels and branching portions of the main channels has more sectional areas of water than the main and the increased channels.

Water-cooled copper casting mold

A copper alloy composite material which comprises a copper alloy matrix and at least one additive selected from solid materials having self-lubricity and wear-resistant materials and uniformly dispersed in the alloy matrix is described. The composite material has improved wear resistance and anti-seizing properties.

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Toyama, Japan

Kunio Nakashima