Turning machining method of flange bolt as well as positioning and clamping device for same

Abstract

The invention provides a turning machining method of a flange bolt as well as a positioning and clamping device for the same, and aims at the defects in the prior art that the head part of a bolt is easy to clamp when a bolt bar of a thin and long bolt of a flange disc is machined. The clamping device comprises a clamping disc and inner polygonal sleeve sections on clamping disc claws; when the clamping disc claw is folded, an integral inner polygonal sleeve is formed by the inner polygonal sleeve sections; a free end of the inner polygonal sleeve is provided with an inner chamfer matched with a flange degree surface of the flange bolt; and the inner polygonal sleeve, the inner chamfer and the clamping disc are coaxial with a tailstock liner. The method adopts the device and takes the inner chamfer as a positioning standard of the head part of the bolt; and the method and the device disclosed by the invention are used for machining the flange bolt so that the contact area is enlarged in a clamping process and prism surfaces of a multi-angle flange disc flange are not easy to injure due to clamping.

Description

technical field [0001] The invention relates to a bolt turning method and a positioning and clamping device, in particular to a turning method and a positioning and clamping device for a bolt shank of a slender flange bolt provided with a waist groove. Background technique [0002] When turning the bolt shank and the waist groove of the bolt shank of the slender hex bolt of the small size flange, the chuck is usually used to clamp the hexagon of the bolt head to clamp and position the bolt head. However, due to the small-sized flange slender bolts, especially those with a length-to-diameter ratio of the bolt shank greater than 20, with waist grooves, and ultra-small head flange slender bolts, the hexagonal size of the head is too small. However, the machining margin of the waist groove is relatively large, the cutting force is relatively large, and the chuck clamping surface of the lathe is provided with a ring groove, so that the contact surface between the chuck claw and t...

AI Technical Summary

Problems solved by technology

However, when the end of the bolt rod is turned with a live center, due to the obvious phenomenon of thermal expansion and contraction of the slender bolt rod, the bolt rod will become longer due to heat during the turning process, but the axial length of the bolt rod is reduced during the turning process. The tip and the three-jaw chuck are fixed, so the bolt rod bends during the processing of the bolt rod, and the finished part becomes a waist drum shape, which cannot meet the dimensional accuracy requirements

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