EXTERNAL THREAD MEMBER

PROBLEM TO BE SOLVED: To increase a service life of a rolling tool by minimizing processing stress between a guide ridge and a cylindrical guide in rolling by changing a structure of a tip of the guide ridge.SOLUTION: An external thread member has a head portion 10 and a shank portion 20, and the sh...

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Bibliographic Details
Main Authors MATSUNO MAYUMI, MATSUEDA YOICHI, TANABE KENICHIRO, MORI SHIGETO
Format Patent
LanguageEnglish
Japanese
Published 01.09.2016
Subjects
BLASTING
DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS ORMACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS,CLIPS, WEDGES, JOINTS OR JOINTING
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
LIGHTING
MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS,WHEELS, RINGS, BARRELS, BALLS
MECHANICAL ENGINEERING
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL
PERFORMING OPERATIONS
PUNCHING METAL
THERMAL INSULATION IN GENERAL
TRANSPORTING
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To increase a service life of a rolling tool by minimizing processing stress between a guide ridge and a cylindrical guide in rolling by changing a structure of a tip of the guide ridge.SOLUTION: An external thread member has a head portion 10 and a shank portion 20, and the shank portion 20 has an ordinary threaded portion 22 having an ordinary ridge 21 to be fastened to an internal thread member 110, a guide threaded portion 26 disposed at a shank portion tip side with respect to the ordinary threaded portion 22, and having a guide ridge 25 of a diameter smaller than the ordinary ridge 21 with the same pitch, and a cylindrical guide 24 disposed further at the shank portion tip side of the guide threaded portion 26. A non-threaded region 29 is disposed between the guide ridge 25 and the cylindrical guide 24, and an axial gap g is formed between a tip 25e of the guide ridge 25 and the cylindrical guide 24.SELECTED DRAWING: Figure 1 【課題】案内ねじ山の先端の構造を変えることにより、転造時に案内ねじ山と円筒状ガイドの間に生じる加工応力を可及的に緩和して転造工具の寿命増加を図る。【解決手段】頭部１０と軸部２０とを備え、軸部２０は、めねじ部材１１０と締結を行う通常ねじ山２１を形成した通常ねじ部２２と、通常ねじ部２２に対して軸部先端側に設けられ通常ねじ山２１より小径で同一ピッチの案内ねじ山２５が形成された案内ねじ部２６５、案内ねじ部２６のさらに軸部先端側に設けられた円筒状ガイド２４と、を有するおねじ部材において、前記案内ねじ山２５と円筒状ガイド２４との間にねじ無し領域２９を設け、案内ねじ山２５の先端２５ｅと円筒状ガイド２４との間に軸方向の隙間ｇを設けたことを特徴とする。【選択図】図１
Bibliography:Application Number: JP20150032929