Toyota Jidosha Kabushiki Kaisha

Satoshi Shionoya

Takashi Yamamoto

Yukitaka Kunimoto

Hitoshi Matsui

Yoshiaki Kadoma

Motoki Watanabe

Satoshi Kanda

A spinning method includes supporting a supported portion of a cylindrical work by a work supporting portion; pressing a first roller of a spinning head against a processed portion of the work while revolving the first roller; and performing a forming process that points a tube axis of the processed portion of the work in a given direction by pressing the first roller and a second roller in which a plane of revolution thereof is provided in a different position, in a rotational axis direction of a spindle of the spinning head, than a plane of revolution of the first roller, while revolving the first roller and the second roller, and moving the work supporting portion relative to the spinning head or moving the spinning head relative to the work supporting portion, while the first roller and the second roller work in cooperation with each other to retain the work.

Spinning method and spinning apparatus

A spinning method includes supporting a supported portion of a cylindrical work by a work supporting portion. The method includes pressing a roller of a spinning head against an outer peripheral surface of a processed portion of the work while revolving the roller. The method also includes performing a forming process that points a tube axis of the processed portion of the work in a given direction by moving the processed portion relative to the work supporting portion or moving the work supporting portion relative to the processed portion, while making a core bar inserted into the processed portion of the work contact an inner peripheral surface of the processed portion.

A method for forming a projection for projection welding includes the steps of: bending a workpiece such that a first end side portion located on one side of the bent portion is perpendicular to a second portion that is located on the opposite side of the bent portion, and pressing the workpiece between a punch and a V-shaped groove of a die. The pressing of the workpiece causes the first portion to the further bent toward the second portion until the inboard surface of the first portion is brought into contact with the second portion. During the pressing step, the outboard surface of the first portion is brought into contact with one surface of the groove while an end surface of the first portion is brought into contact with a second surface of the groove, with the thicknesses of the first portion and the second portion of the workpiece being plastically changed.

Method for forming a projection for projection welding

A pulsed arc welding apparatus includes a consumable electrode wire which is fed toward a workpiece at a wire feeding rate, a power supply for supplying a welding current to the wire to produce a droplet at the end of the wire by the heat of arc, a pulse form setting part for setting a pulse form of the welding current supplied by the power supply, based on a peak current and a pulse duration, an optimum pulse determining part for determining a peak current and a pulse duration for each of pulses of the welding current based on an average current and for supplying the peak current and the pulse duration to the pulse form setting part so that each respective peak current and each respective pulse duration of the welding current supplied to the wire have a minimum value needed to transfer a droplet from the wire to the workpiece for each pulse at a rate synchronous with the wire feeding rate, and an average current setting part for setting the average current based on the wire feeding rate and for supplying the average current to the optimum pulse determining part.

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Okazaki, Japan

Satoshi Shionoya