Tanaka Seimitsu Kogyo Co.

Toyama-shi, Japan

Tanaka Seimitsu Kogyo Co.

Toyama-shi, Japan
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Ishihara S.,University of Toyama | Yoshifuji S.,University of Toyama | McEvily A.J.,University of Connecticut | Kawamoto M.,Tanaka Seimitsu Kogyo Co. | And 2 more authors.
Fatigue and Fracture of Engineering Materials and Structures | Year: 2010

High speed steels, such as the alloy H-13, when used as forging dies are subjected to both wear and cyclic loading, and both of these factors can affect the useful life of such dies. It follows that it is of some importance to determine the fatigue characteristics of such steels. However, fatigue studies of such alloys are limited, especially with respect to fatigue crack propagation (FCP) behaviour as a function of mean stress, and therefore more detailed studies are necessary. In the present study, the fatigue lifetimes and the crack propagation behaviour of a high speed steel were experimentally investigated in laboratory air under different stress ratios, R. A modified linear-elastic fracture mechanics (LEFM) approach was applied to analyze the experimentally-obtained FCP behaviour. The predicted S-N curves and crack growth behaviour for a wide range of R ratios agree well with the experimental data, and the modified LEFM approach is therefore considered to be useful for evaluation of the fatigue behaviour of this class of high strength steels. © 2010 Blackwell Publishing Ltd.


Horita A.,University of Toyama | Ishihara S.,University of Toyama | Goshima T.,University of Toyama | Kawamoto M.,Tanaka Seimitsu Kogyo Co. | And 3 more authors.
Journal of Thermal Stresses | Year: 2012

In the present study, the repeated forging experiments were conducted using the real forging machine. For supplement of the experiments, forging simulation was also conducted to evaluate the forging load vs. stroke relation during the forging process. Further, stress intensity factor K at the fatigue crack-tip initiated in the real forging tool was evaluated using the new method proposed in the present study. Conclusions obtained are summarized as follows: (1) The cracked portions found in both the real forging-die and -punch are places where the maximum equivalent stresses occur during the forging process; (2) the data (da/dN, K) evaluated for the real forging die and punch corresponds well with the experimental relation da/dN vs. K obtained in laboratory air; and (3) the proposed simulation method is useful for estimating lifetimes of the forging die and punch. © 2012 Copyright Taylor and Francis Group, LLC.


Patent
Tanaka Seimitsu Kogyo Co. | Date: 2012-04-11

For reduction in size and weight, friction materials aiming at a high coefficient of kinetic friction have been developed. However, friction materials with a high coefficient of kinetic friction may cause sticking to a sliding partner material and deteriorated feeling in operation in particular in the initial running-in period during the initial stage of use. Therefore, the use of friction materials with a high coefficient of kinetic friction has been restricted. Since such sticking to the sliding partner material is less likely to occur after experiencing an initial running-in period, developed was a friction material in a form that is effective in prevention of sticking during the initial running-in period. Among sliding surfaces 5 between the friction material 3 and the sliding partner material 7, only the initial sliding surface 5, or only the initial sliding surface 5 and the vicinity thereof are in contact during the initial running-in period, and the area in contact with the sliding partner material gradually increases over time to full-area contact, that is, full contact of the whole sliding surfaces 5. The above constitution provides a sliding friction material having excellent sticking resistance with excellent friction performance and abrasion resistance.


Patent
Tanaka Seimitsu Kogyo Co. | Date: 2014-03-26

A major objective of the present invention is to provide a magnetically enhanced resin and the like having an improved magnetic permeability. The magnetically enhanced resin contains a ferromagnetic material, a compound having a macrocyclic electronic structure, and an adhesive resin. The ferromagnetic material is preferably a powder of a Fe-Ni alloy, a Fe-Ni-Mo alloy, a Fe-Ni-Cu alloy, or a Fe-Al-Si alloy. The ferromagnetic material is preferably a powder of permalloy, supermalloy, sendust, or ferrite. The compound having a macrocyclic electronic structure is preferably phthalocyanine, porphyrin, or polycyanine, a substitution product thereof, or a metal coordination complex thereof. The adhesive resin is preferably an epoxy resin, a melamine resin, a polyimide resin, a polycarbonate resin, a phenol resin, or a fluorosilicone resin. The average particle size of the powder of the ferromagnetic material is preferably 0.1 to 100 m.


Patent
Honda Corporation and Tanaka Seimitsu Kogyo Co. | Date: 2010-11-03

Abrasion resistance is further enhanced in a sliding member used in an internal combustion engine. With respect to a valve lifter 6 used in an internal combustion engine 100, hard particles having higher hardness than the valve lifter 6 are dispersed onto the top face 61 of the valve lifter 6, and a nitriding treatment is conducted on the top face 61 dispersed with the hard particles.

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