Nhk Spring Co., Ltd.

Kobe Steel, Ltd.

Shinko Metal Products Co., Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Takashi Yajima

Akira Katsuyama

Kotaro Nukui

Akira Tange

Hideki Okada

Takuya Kochi

Kotaro Toyotake

Takeshi Furuse

Hitoshi Hatano

Eiichi Tamura

Katsuyuki Nishioka

Yuji Mori

Kenichiro Morino

Takayuki Morishima

A hollow seamless pipe for a high-strength spring in the present invention includes a steel material in which chemical component compositions are properly adjusted, wherein a depth of a whole decarburized layer in an inner surface layer part is 100 &#x3bc;m or less, a depth of a flaw which is present in an inner surface is 40 &#x3bc;m or less, a width of the flaw is 60 &#x3bc;m or less, and a number density of a carbide which has a circle equivalent diameter of 500 nm or more and is present in the inner surface layer part is 1.8&#xd7;10particles/&#x3bc;mor less.

Hollow seamless pipe for high-strength spring

A work hanging apparatus includes a hanger line continuously conveying hangers each having a hook, a robot that has a hand with which a work having a hole is held and transfers the held work to a hanging location set in the hanger line, a controller controlling a movement of the hand to catch the hook of one of the hangers with the hole of the held work at the hanging location, a hole deviation detector that detects a positional deviation of the hole of the work, an attitude deviation detector that detects an attitudinal deviation of the hanger, and a corrector that corrects the movement of the hand according to the positional and attitudinal deviations.

Work hanging apparatus and work hanging method for hanging work on hanger through movement of work under correction

A straight-shaped hollow spring material is used in a blasting apparatus. The length of the spring material is set to be 1.5 m to 3.5 m, and the inner diameter of the spring material is set to be not more than 10 mm&#x3c6; (not including 0). In inner surface abrasive blasting for the spring material, first and second blastings are performed. In the first blasting, abrasives are ejected to an opening portion of the spring material and are suctioned from a second opening portion thereof. In the second blasting, the abrasives are ejected to the second opening portion and are suctioned from the opening portion. The ejection pressure, the suction pressure, and the like are appropriately set, so that generation of grinding amount difference between the center portion and both end portions of the inner surface of the spring material can be inhibited.

Hollow spring and method for manufacturing same

In an end sealing step, an end is sealed by which the core material of the end of a spring member is gathered by machining. For example, a squeezing roller is moved in an axial direction as necessary, while the end of the spring member is pressed to the inside in a radial direction by the squeezing roller. As a result, the end of the spring member is sealed and therefore, it is not necessary to use another member such as a lid member. For example, the end sealing step can be immediately carried out after an inner surface processing step. In a coil forming step after the end sealing step, formation of clearance can be prevented at the end even if the end of the spring member is gripped and the spring member is wound around the rod.

Hollow coil spring and method for manufacturing same

A coil wire material is bent by a first roll, a second roll, and a third roll. The bent coil wire material is pressed in a screwing direction, to shape a coil spring having a desired diameter and a pitch. A desired pitch can be accurately formed in a manner that a second roll provided on a downstream side of a conveying direction of the coil wire material is configured to be able to move hack and forth along the screwing direction of the coil spring and to be tiltable about an axis of rotation parallel to the conveying direction of the coil wire material.

Coil-spring manufacturing apparatus

A method for heat treatment of a coiled spring includes cold forming a coiled spring, annealing the coiled spring after the cold forming, thereby removing of residual stress generated in the cold forming, in which the annealing is performed by electric resistance heating.

Method for heat treatment of coiled spring

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Yokohama, Japan

Takashi Yajima