A three-jaw chuck

Abstract

The invention belongs to the technical field of machining, and particularly relates to a three-jaw chuck. The three-jaw chuck comprises a chuck body and clamping jaws, wherein each of the three clamping jaws is formed through the mode that three transverse pressing blocks are adopted to mutually be overlapped and spliced, guiding sliding grooves are formed inside the pressing blocks at the bottommost ends of the clamping jaws, and clamping grooves are formed in the bottom ends of the guiding sliding grooves; sliding blocks are slidably arranged in the guiding sliding grooves, and pressing plates are connected to the bottom ends of the sliding blocks; the pressing plates and the clamping grooves are mutually clamped and matched; threaded locking holes are formed in the sliding blocks; countersunk threaded holes are formed in the vertical directions of the clamping jaws; the countersunk threaded holes are in threaded connection with the threaded locking holes through inside hexagonal bolts; the bottom ends of the threaded locking holes are provided with bearings, and rotating columns are connected in the bearings; and inner hexagonal bolts are arranged in the rotating columns in an inserting mode. The phenomenon that the clamping force of the chuck body to a cylinder is small due to the fact that the diameter of the machined cylinder is different, the cylinder breaks or is damaged under the state that the cutting force is large, and therefore the safe operation of the chuck body is influenced is prevented.

Description

technical field [0001] The invention belongs to the technical field of machining, in particular to a three-jaw chuck. Background technique [0002] At present, in industrial production, people usually use machine tools to process various workpieces. The processing process is usually divided into two types. One is to fix the tool and move the workpiece around the tool to complete the processing, and the other is to fix the tool and move the workpiece around the tool. piece movement to complete the machining. Regardless of the processing method, one of the tool and the workpiece needs to be clamped and fixed. The commonly used clamping device on the machine tool is a three-jaw chuck. [0003] The three-jaw chuck is mainly composed of a large bevel gear, three small bevel gears, three jaws and a chuck body acting as a bracket. The three small bevel gears mesh with the large bevel gear, and the back of the large bevel gear has a flat thread structure. , the three claws are equ...

AI Technical Summary

Problems solved by technology

[0004] When the existing three-jaw chuck is in use, especially when clamping some parts with special shapes, for example: the processed part is a cylinder and the clamping position of the cylinder is a stepped structure, and then the cylindrical body with a stepped structure When clamping, because the clamping surface of the claw is flat, the clamping force of the claw is too small when clamping the stepped cylinder, and the clamping stability is poor.

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