Numerically-controlled machine tool back-pulling type internal-expansion zero-displacement airtightness detection clamp

Abstract

The invention relates to the technical field of numerically-controlled lathes, in particular to a numerically-controlled machine tool back-pulling type internal-expansion zero-displacement airtightness detection clamp which comprises a main shaft connecting flange, a clamp body, a pull rod, a rubber flexible expansion sleeve, a reference and a limiting assembly, the clamp body is arranged at the upper end of the main shaft connecting flange, and the reference is arranged on the upper surface of the clamp body; a machined part is arranged at the upper end of the benchmark, the lower end of a pull rod penetrating between the two clamp bodies is in threaded connection with a rear pull disc, the upper end of the pull rod is in threaded connection with a threaded cover, four sets of fixing blocks are fixed to the upper surface of the threaded cover, and a limiting assembly is hinged to a rotating shaft fixed between each set of fixing blocks. The rubber flexible expansion sleeve penetrates through the middle of the limiting assembly, an upper cover is arranged at the upper end of the limiting assembly, gears are connected to the side faces of sawtooth strips fixed to the left end and the right end of the upper cover in a meshed mode, and meanwhile the rubber flexible expansion sleeve can be conveniently installed through the limiting assembly capable of being opened and closed and can be conveniently attached to the inner side face of a machined part. And deformation of the machined part is reduced.

Description

technical field [0001] The invention relates to the technical field of numerically-controlled lathes, in particular to a back-pull-type internal expansion zero-displacement airtight detection fixture for numerically-controlled machine tools. Background technique [0002] At present, manual chucks, hydraulic chucks and other types of internal displacement fixtures are usually used. When manual chucks and hydraulic chucks clamp the workpiece, when the clamping length is less than 5mm, the clamped parts are separated during processing. The risk of the chuck, when clamping thin-walled parts, because the clamping surfaces of the two-jaw, three-jaw, and four-jaw chucks are in contact at two, three, and four points during clamping, the clamping force is uneven. It will cause deformation of thin-walled parts, and the geometric size and geometric accuracy of the parts cannot be guaranteed. In addition, the chuck clamping is also deformed because the gap between the jaws and the thin-...

AI Technical Summary

Problems solved by technology

[0002] At present, manual chucks, hydraulic chucks and other types of internal expansion displacement fixtures are usually used. When manual chucks and hydraulic chucks clamp workpieces, when the clamping length is less than 5mm, the clamped parts will be detached during processing. The risk of the chuck, when clamping thin-walled parts, because the clamping surface of the two-jaw, three-jaw, and four-jaw chucks is in contact with two points, three points, and four points when clamping, the clamping force is unevenly divided. It will cause deformation of thin-walled parts, and the geometric size and geometric accuracy of the parts cannot be guaranteed. In addition, the clamping of the chuck is also deformed because of the gap between the jaws and the thin-walled parts that cannot withstand the minimum pressure of the hydraulic chuck; other types of internal expansion displacement When the fixture clamps the workpiece, the inner expansion sleeve will be axially displaced during the clamping movement. In this case, when clamping the blind hole parts or the clamping distance is less than 3mm, the clamping distance will be caused by insufficient clamping distance. Insufficient holding force, so that the clamped part has the risk of falling out of the fixture during processing, and this kind of fixture cannot accurately set the clamping distance

[0003] In addition, when processing flange parts, some types of parts have higher requirements for parallelism. When clamping parts, there may be iron filings or other foreign objects that have not been cleaned between the installation datum surface and the parts. At this time, In the absence of detection means, parallelism is difficult to guarantee, and the qualified rate of finished products decreases

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