Hydraulic expansion mandrel clamp

Abstract

The utility model provides a hydraulic expansion mandrel clamp which comprises a connecting disc installed on a lathe packing, a mandrel is fixedly arranged in an inner hole of the connecting disc through a cylindrical head socket head cap screw II, a thin-wall expansion sleeve is arranged on the outer diameter of the mandrel through a positioning pin, a piston is arranged in an inner hole of the mandrel, and the inner hole of the mandrel is provided with a nut. An adjusting and locking plug is arranged in a screw hole in the right end of the mandrel, the left end of the adjusting and locking plug is embedded into a groove in the right end of the piston, a closed cavity is formed between the mandrel and the thin-wall expansion sleeve, and hydraulic oil is arranged in the cavity. An inner hole is expanded through the expansion sleeve in a nearly full-surrounding mode, so that a part can be automatically centered, meanwhile, it is guaranteed that the whole cutting range is supported, rigidity of a cutting part is improved, stress deformation of the part is controlled, the part is axially positioned by means of the end face of the mandrel, repeated clamping axial precision is guaranteed, only the locking plug needs to be rotated and adjusted during assembly and disassembly, and a workpiece is very convenient to disassemble.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical field, concretely relates to a hydraulic expansion mandrel clamp. BACKGROUND

[0002] In prior art, thin-walled sleeve parts are prone to deformation during clamping, and under the action of cutting force, the workpiece is prone to local extrusion deformation during processing, causing vibration during processing and size rebound after processing, affecting the size accuracy and surface finish of the workpiece, and the existing clamping method cannot meet the actual demand.

[0003] When processing thin-walled sleeve parts on a lathe, the processed parts are qualified when measured on the lathe, but out of tolerance when measured again after being taken off the lathe, mainly due to clamping deformation. There are two conventional clamping methods: the first is three-jaw chuck clamping, which is prone to deformation of thin-walled sleeve parts under three-point force; the second is open sleeve clamping, which is better than the first in clamping method and relatively uniform in force, but still has poor effect on thin-walled sleeve parts with small processing tolerance, and the clamping and alignment efficiency of the processed parts is low and the scrap rate is high. SUMMARY

[0004] The utility model provides a kind of hydraulic expansion mandrel clamp, solve the defect that workpiece clamping is easy to change in background art, vibration during processing, size rebound after processing.

[0005] The technical scheme of the utility model is realized as follows: a kind of hydraulic expansion mandrel clamp, including the connecting disc being installed on the lathe packing, the connecting disc inner hole is fixed with mandrel by cylinder head inner hexagonal screw II, the outer diameter of the mandrel is equipped with thin-walled expansion sleeve by positioning pin, the mandrel inner hole is equipped with piston, adjusting lock screw is embedded in the right end groove of the piston in the right end screw hole of the mandrel, adjusting lock screw left end, the O-ring I and O-ring II are respectively arranged between the mandrel and the thin-walled expansion sleeve and between the piston and the mandrel, the mandrel and the thin-walled expansion sleeve form a closed cavity, and the cavity is equipped with hydraulic oil.

[0006] The utility model discloses a beneficial effect is: the utility model discloses through the movement of piston, extrude the hydraulic oil in the closed cavity formed between core shaft and thin wall expansion sleeve, force thin wall expansion sleeve outer diameter even expansion, press on the inner hole wall of workpiece, to make workpiece get centering expansion, because the pressure even of hydraulic oil, force thin wall expansion sleeve outer diameter even expansion expansion workpiece, with this kind of clamping mode can effectively avoid the deformation caused by clamping, thereby improve production efficiency and reduce the scrap rate, through the expansion sleeve nearly full encirclement expansion tight inner hole, and the part can be automatic centering, guarantee the whole cutting range all has the support, increase cutting site rigidity, control part stress deformation, axial lean core shaft end surface positioning, guarantee repeat clamping axial precision, and the loading and unloading only need to rotate the adjusting lock nut, very convenient dismounting workpiece. The tool clamping is convenient, easy operation, automatic centering repeat precision is high, and it has great significance to thin wall sleeve class workpiece precision machining. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 It is the structural schematic diagram of the utility model.

[0008] Part description: 1, connecting disc, 2, core shaft, 3, thin wall expansion sleeve, 4, O ring I, 5, cylinder head inner hexagonal screw I, 6, cylinder head inner hexagonal screw II, 7, positioning pin, 8, hydraulic oil, 9, O ring II, 10, piston, 11, adjusting lock nut, 12, workpiece, 13, lathe packing. DETAILED DESCRIPTION

[0009] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0010] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0011] Refer to the drawings Figure 1A hydraulic expanding mandrel clamp, the connecting disc 1 is installed on the lathe disc 13 through the stopper, is fastened by the cylinder head internal hexagonal screw I 5, the mandrel 2 passes through the hole of the connecting disc 1 and is fastened by the cylinder head internal hexagonal screw II 6, the thin-wall expanding sleeve 3 is installed on the outer diameter of the mandrel 2 and is fixed through the positioning pin 7, the piston 10 is installed in the hole of the mandrel 2, the left end of the adjusting locking nut 11 is embedded in the groove at the right end of the piston 10, and the adjusting locking nut 11 is screwed into the screw hole at the right end of the mandrel 2, the hydraulic oil 8 is enclosed in the cavity formed between the mandrel 2 and the thin-wall expanding sleeve 3, and the cavity is enclosed through the O-ring I 4 and the O-ring II 9.

[0012] Method for use:

[0013] Clamping workpiece: the adjusting locking nut 11 is screwed in to move leftwards, drives the piston 10 to move leftwards to extrude the hydraulic oil 8, the hydraulic oil 8 forces the thin-wall expanding sleeve 3 to expand radially and press on the inner hole wall of the workpiece 12, so that the workpiece 12 is centered and expanded.

[0014] Releasing workpiece: the adjusting locking nut 11 is screwed out to move rightwards, drives the piston 10 to move rightwards to release the hydraulic oil 8, forces the thin-wall expanding sleeve 3 to restore the original state under the action of the elastic force, so that the workpiece 12 is removed.

[0015] The mandrel clamp is simple and convenient to operate, has large clamping area, and obviously improves the rigidity in the machining of the thin-wall part, especially for the workpiece whose inner hole has been precisely machined and whose thin-wall outer circle needs to be machined, under the premise of being able to provide high centering precision and stability, the coaxiality, smoothness of the outer circle and the deformation after machining can be improved, which has special significance.

[0016] The above only describes the preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A hydraulic swage mandrel clamp characterized by The utility model relates to a connecting disc (1) installed on the lathe packing (13), the inner hole of connecting disc (1) is fixed with mandrel (2) through cylinder head inner hexagonal screw II (6), the outer diameter of mandrel (2) is equipped with thin wall expansion sleeve (3) through positioning pin (7), the inner hole of mandrel (2) is equipped with piston (10), adjusting locking screw (11) is arranged in the right end screw hole of mandrel (2), adjusting locking screw (11) left end is embedded in the right end groove of piston (10), mandrel (2) and thin wall expansion sleeve (3) between, piston (10) and mandrel (2) between are equipped with O ring I (4) and O ring II (9) respectively, mandrel (2) and thin wall expansion sleeve (3) between form closed cavity, and the cavity is equipped with hydraulic oil (8).

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