MANUFACTURE OF EXTENSION BOLT

PURPOSE:To avoid wasting of material and manufacture an extension bolt in a short time and at low cost by setting a sectional die head to an annular groove formed at the bolt shank part of a bolt material and pressing the bolt material forcibly in an axial direction. CONSTITUTION:A bolt material 2 i...

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Bibliographic Details
Main Author IDE MASAAKI
Format Patent
LanguageEnglish
Published 20.05.1983
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
WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Summary:PURPOSE:To avoid wasting of material and manufacture an extension bolt in a short time and at low cost by setting a sectional die head to an annular groove formed at the bolt shank part of a bolt material and pressing the bolt material forcibly in an axial direction. CONSTITUTION:A bolt material 2 in which the head 2d is formed at upper end of a bolt shank 2a from a wire rod by usual method is manufactured. The shank part 2a is held between flat dies 1, 1 for rolling and rubbed up, and external thread 2b is formed on the main shank in front of the shank 2a by cutting grooves 1a, 1b of dies 1, 1. At the same time, an annular groove 2c is formed at intermediate part of the shank 2a. Then, the main shank provided with external thread is inserted into a through hole 3a. Under this condition, the material 2 is set to a sectional die head 3 to hold the shank 2a by a drawing die 2b at the groove 2c. Under this state, the material is forcibly pressed in axial direction by pressing the bolt head 2d with a punch 5. The part extending from the main shank part to the lower part of the head 2d is stretched, and an objective extension bolt formed to a small diameter part 2f which has the same diameter as the groove 2c is obtained.
Bibliography:Application Number: JP19810182582