Hydraulic elastic chuck and clamping method thereof

Abstract

The invention relates to the technical field of machining and particularly relates to a hydraulic elastic chuck and a clamping method thereof. By pushing a sealing plunger to pressurize hydraulic fluid, a thin wall deforms and expands outwards, claws at the front end of the thin wall are driven to stretch outwards, and the claws loosen workpieces or clamp the workpieces. The structure is simple, the production cost is low, and the operation is flexible. The clamping of the workpieces is convenient, the machining precision of the workpieces is improved, and the production efficiency is increased. According to the machining method of the hydraulic elastic chuck, after the hydraulic elastic chuck is fixedly arranged on a machine tool spindle, machining is carried out on the outer sides and / orinner sides of the claws, and a ring formed by a plurality of claws which get together is highly concentric with the machine tool spindle, so that the machining precision can be improved; and then, through locating structures on the claws, the to-be-machined workpieces are precisely located in axial, radial and rotating directions, so that when the same batch of workpieces are massively produced,the initial machining position points of all workpieces are ensured to be the same, and the machining precision during the mass production of the products is improved.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a hydraulic elastic collet and a clamping method thereof. Background technique [0002] At present, there are generally two types of clamping methods for machining workpieces in machine tools: the first is mechanical three-jaw chuck clamping, and the second is to clamp the workpiece by hydraulic pressure to force the elastic deformation of the thin-walled sleeve, that is, the hydraulic chuck; The self-centering accuracy of the mechanical three-jaw chuck is poor, the operation is inflexible, and the labor intensity is high, which greatly affects the processing accuracy and production efficiency of the product; the structure of the second hydraulic chuck (such as the Chinese utility model patent "a hydraulic chuck head tooling", authorized announcement number: CN 201659445U), the inner core and the clamping sleeve are respectively provided with a connected oil circuit...

AI Technical Summary

Problems solved by technology

[0002] At present, there are generally two types of clamping methods for machining workpieces in machine tools: the first is mechanical three-jaw chuck clamping, and the second is to clamp the workpiece by hydraulic pressure to force the elastic deformation of the thin-walled sleeve, that is, the hydraulic chuck; The self-centering accuracy of the mechanical three-jaw chuck is poor, the operation is inflexible, and the labor intensity is high, which greatly affects the processing accuracy and production efficiency of the product; the structure of the second hydraulic chuck (such as the Chinese utility model patent "a hydraulic chuck head tooling", authorized announcement number: CN 201659445U), the inner core and the clamping sleeve are respectively provided with a connected oil circuit, the front end of the clamping sleeve is provided with a thin-walled sleeve, and the outer wall of the thin-walled sleeve is provided with a The oil groove connected to the oil circuit, which applies pressure to the hydraulic oil, causes the oil groove part of the thin-walled sleeve to deform inwardly to clamp the workpiece assembled in the thin-walled sleeve. This method can only clamp the shaft Such workpieces, and the thin-walled sleeve needs to be processed before assembly, which requires high dimensional accuracy. After the workpiece is clamped, the inner hole of the chuck cannot be turned. There is a defect of low centering accuracy, and the batch size of the workpiece cannot be determined. The initial processing position of each workpiece is the same during production

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