Honda Giken Kogyo Kabushiki Kaisha

Tsukashi Ohama

Yoshihisa Doi

Yuichi Nagao

Mikio Kobayashi

Tomonori Nakamura

Junya Saeki, Deceased

A forging die apparatus comprises a punch for applying a pressurizing force to a forging material arranged in a cavity, a cylindrical member installed to surround a part of outer circumference of the punch, for making displacement integrally with the punch, and a first ring member formed with a hole for forcibly inserting the cylindrical member therein when the punch applied the pressurizing force to the forging material.

Forging die apparatus

A forging die apparatus comprises a punch for applying a pressurizing force to a forging material arranged in a cavity, a cylindrical member installed to surround a part of outer circumference of the punch, for making displacement integrally with the punch, and a first ring member formed with a hole for forcibly inserting the cylindrical member therein when the punch applies the pressurizing force to the forging material.

A forge-molding method for forming a constant velocity joint outer ring comprising a shaft and a cup formed integral with and expanding radially and outwardly from one end of the shaft is provided. The method uses an ironing die apparatus which is provided with a lower molding die, an upper molding die and an ironing punch. The lower molding die is provided with a first cavity formed to have a final degree of product accuracy with respect to the shaft and adapted to apply a final ironing process to the shaft, while the upper molding die is provided with a second cavity for restraining the outer peripheral surface of the cup. Consequently, the accuracy of concentricity between the shaft and the cup can be securely maintained in a simple manner and a sufficient degree of accuracy of the inner peripheral surface and/or the inner diameter of the cup can be effectively secured.

Method of forming outer ring of constant velocity joint

A plurality of grooves, which are defined in a reinforcing ring, comprise respective end walls which are formed as inclined surfaces. The grooves further comprise walls on which engaging projections are disposed in parallel to the inclined surfaces respectively. Segmented dies are installed in the grooves. Grooves, which are defined on the segmented dies, slidably engage with the engaging projections respectively. Accordingly, the segmented dies are displaced along the inclined surfaces while being guided by the engaging projections. Thus, it is possible to stably hold the segmented dies on the reinforcing ring. Further, it is possible to simplify the structure of the forging apparatus, and it is possible to decrease the number of parts.

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Utsunomiya, Japan

Tsukashi Ohama