Toyota Jidosha Kabushiki Kaisha

Kiyokazu Uruno

Akiyoshi Morita

Toshiharu Fukuizumi

Hideo Nonoyama

Takashi Ito

Atsushi Niimi

Tadakazu Inamori

Kosuke Shiramizu

Keiji Yamauchi

Hidemi Chiba

Automatic assembling apparatus

In a process for producing a surface remelted chilled layer camshaft by using a high density energy irradiation and self-cooling, a cam is rotated around the center axis of the camshaft and a position of a torch for the irradiation (e.g., a TIG arc torch) is controlled so as to form an angle between a tangential line of the cam surface and a horizontal line at a melting position in a lower side of the horizontal line in a direction opposite to the camshaft rotation direction being from 30.degree., preferably 20.degree., to zero degree.

Process for producing surface remelted chilled layer camshaft

A process for producing a camshaft with cams include the steps of forming a surface hardened layer in each of the cams by a remelting chilling treatment using high density energy (e.g., a TIG arc), characterized in that after the remelting chilling treatment, the camshaft is cooled by passing a cooling medium through a through hole formed longitudinally in the camshaft. As a result of the cooling, the neighboring untreated cam has a temperature of up to 250.degree. C. Elongation of the camshaft due to thermal expansion is so small that no melt-down end portion defects appear.

Process for producing camshaft with cams subjected to remelting chilling

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Toyota, Japan

Kiyokazu Uruno