A positioning turning fixture for a finish car chuck and a positioning turning method thereof

Abstract

The invention discloses a positioning and turning clamp of a finish turning chuck. The positioning and turning clamp of the finish turning chuck comprises a clamping claw base which is connected with a chuck body in a sliding way, a first-stage soft claw and a second-stage soft claw which are respectively fixed to the clamping claw base and are arranged in a nested way, and a tensioning ring used for positioning, wherein the first-stage soft claw is matched with the tensioning ring; the second-stage soft claw and a machined workpiece are compressed in a matched way; when the second-stage clamping claw is used for clamping the machined workpiece, the first-stage soft claw is arranged inside the second-stage clamping claw and is matched with the tensioning ring in a clamping way; when the second-stage soft claw is used for expanding the machined workpiece, the first-stage clamping claw is arranged outside the second-stage soft claw and is matched with the tensioning ring in an expanding way. The invention discloses a positioning and turning method of the finish turning chuck. The positioning and turning method comprises the following steps: 1) performing self-turning on the first-stage clamping claw; 2) performing self-turning on the second-stage clamping claw; 3) positioning the end surface position of the machined workpiece by means of the contact between the machined workpiece and a support ring, positioning the axis position of the machined workpiece through the clamping or the expanding of the self-turned second-stage soft claw, and completing the positioning and the clamping of the machined workpiece.

Description

technical field [0001] The invention relates to the field of precision lathe machine tool processing, in particular to a precision lathe chuck positioning turning fixture and a positioning turning method thereof. Background technique [0002] Finish turning is the finishing process in machine tool processing technology. It is necessary to ensure the corresponding requirements of product size tolerance, row position tolerance and surface roughness. The standards of each requirement are higher than that of rough turning; the chuck is used to clamp The mechanical device of the workpiece, which utilizes the radial movement of the movable jaws uniformly distributed on the chuck body, is a machine tool accessory that clamps and positions the workpiece. It is usually installed on lathes, external cylindrical grinders and internal cylindrical grinders. It can also be used Cooperate with various indexing devices for milling machines and drilling machines. [0003] When turning workp...

AI Technical Summary

Problems solved by technology

According to the precision requirements, the closer the claw surface of the soft claw is to the size of the workpiece, the better. However, the actual situation in the prior art is that it is impossible to find a suitable positioning ring or positioning cylinder for different workpieces to realize self-turning, especially when the soft When re-turning is required after jaw switching, it is necessary to re-turn the positioning ring to meet the demand or continue to use the original positioning ring to turn the soft jaw to obtain an approximate soft jaw positioning circle. Therefore, the positioning ring or soft jaw needs to be adjusted every time. In turning, the locating ring will be consumed with the self-turning of the soft jaw, which not only causes waste of the locating ring, but also the same batch of parts are processed by the soft jaw chuck under different turning conditions, which will inevitably affect the positioning of the processed workpiece Accuracy, it is impossible to achieve the same standard of precision self-carrying and positioning and clamping of the same standard, especially for thin-walled parts, when the accuracy of the positioning circle of the soft jaw deviates, it will cause deformation of the thin-walled parts, and affect the roundness and runout of the workpiece, etc. The shape and position tolerance will have adverse effects, the positioning accuracy is poor, and the accuracy requirements cannot be met

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