CN223465581U

CN223465581U - Hydraulic expansion mandrel clamp

Info

Publication number: CN223465581U
Application number: CN202422694473.8U
Authority: CN
Inventors: 孟庆礼; 董旭辉; 孙涛; 刘晓辉
Original assignee: YANTAI HAIDE MACHINE TOOL CO Ltd
Current assignee: YANTAI HAIDE MACHINE TOOL CO Ltd
Priority date: 2024-11-06
Filing date: 2024-11-06
Publication date: 2025-10-24
Anticipated expiration: 2034-11-06

Abstract

The utility model provides a hydraulic expansion mandrel clamp which comprises a connecting disc arranged on a lathe packing, wherein a mandrel is fixedly arranged in an inner hole of the connecting disc through a cylindrical head inner hexagon 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 the inner hole of the mandrel, an adjusting locking screw plug is arranged in a screw hole at the right end of the mandrel, the left end of the adjusting locking screw plug is embedded into a groove at 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. The utility model can automatically center the part by nearly fully surrounding the expansion inner hole through the expansion sleeve, simultaneously ensures that the whole cutting range is supported, increases the rigidity of the cutting part, controls the stress deformation of the part, axially positions the part by the end face of the mandrel, ensures the axial precision of repeated clamping, only needs to rotationally adjust the locking screw plug for loading and unloading, and is very convenient for disassembling the workpiece.

Description

Hydraulic expansion mandrel clamp

Technical Field

The utility model belongs to the field of machinery, and particularly relates to a hydraulic expansion mandrel clamp.

Background

In the prior art, the thin-wall sleeve type part has the defects that the thickness of the wall is thin, the clamping is extremely easy to deform, the workpiece is easy to locally squeeze and deform under the action of cutting force in the processing process, vibration and size rebound after processing occur in the processing process, the size precision and the surface smoothness of the workpiece are affected, and the existing clamping mode can not meet the actual requirements.

When thin-wall sleeve parts are machined on a lathe, the machined parts are qualified when measured on the lathe, and the parts are removed from the lathe and measured again too much, so that the clamping deformation problem is mainly caused. The conventional clamping modes comprise a three-jaw chuck clamping mode in which three points are stressed and the clamping deformation of the thin-wall sleeve parts is large, an open jacket clamping mode in which the clamping force is relatively uniform and better than that of the first clamping mode, and the clamping effect of the thin-wall sleeve parts with small machining tolerance is still poor, and the clamping alignment efficiency of the machined parts is low and the rejection rate is high.

Disclosure of utility model

The utility model provides a hydraulic expansion mandrel clamp, which solves the defects of variability in workpiece clamping, vibration in processing and size rebound after processing in the background technology.

The technical scheme is that the hydraulic expansion mandrel clamp comprises a connecting disc arranged on a lathe packing, a mandrel is fixedly arranged in an inner hole of the connecting disc through a cylindrical head inner hexagon screw II, a thin-wall expansion sleeve is arranged on the outer diameter of the mandrel through a locating pin, a piston is arranged in the inner hole of the mandrel, an adjusting locking plug is arranged in a screw hole at the right end of the mandrel, the left end of the adjusting locking plug is embedded into a groove at the right end of the piston, an O-shaped ring I and an O-shaped ring II are respectively arranged between the mandrel and the thin-wall expansion sleeve and between the piston and the mandrel, a closed cavity is formed between the mandrel and the thin-wall expansion sleeve, and hydraulic oil is arranged in the cavity.

The utility model has the beneficial effects that the hydraulic oil in the closed cavity formed between the mandrel and the thin-wall expansion sleeve is extruded through the movement of the piston, the outer diameter of the thin-wall expansion sleeve is forced to be uniformly expanded and pressed on the inner hole wall of a workpiece, so that the workpiece is centered and expanded, the outer diameter of the thin-wall expansion sleeve is forced to be uniformly expanded and expanded to tightly expand the workpiece due to uniform pressure generated by the hydraulic oil, the clamping mode can effectively avoid deformation caused by clamping, thereby improving the production efficiency and reducing the rejection rate, the workpiece can be automatically centered through the expansion sleeve which is nearly fully enclosed to expand the inner hole, the whole cutting range is ensured to be supported, the rigidity of the cutting part is increased, the stress deformation of the workpiece is controlled, the workpiece is axially positioned against the end face of the mandrel, the axial precision of repeated clamping is ensured, and the workpiece is conveniently disassembled by rotating and adjusting the locking screw plug. The fixture is convenient to clamp, simple to operate and high in automatic centering repetition precision, and has great significance for precision machining and manufacturing of thin-wall sleeve workpieces.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

The part description comprises 1, a connecting disc, 2, a mandrel, 3, a thin-wall expansion sleeve, 4, O-shaped rings I,5, socket head cap screws I,6, socket head cap screws II,7, a locating pin, 8, hydraulic oil, 9, O-shaped rings II,10, a piston, 11, an adjusting locking screw plug, 12, a workpiece, 13 and a lathe packing.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Referring to fig. 1, a hydraulic expansion mandrel clamp is characterized in that a connecting disc 1 is installed on a lathe packing 13 through a spigot, a cylindrical head inner hexagon screw I5 is used for tightening, a mandrel 2 penetrates through an inner hole of the connecting disc 1 and is tightly tightened through a cylindrical head inner hexagon screw II6, a thin-wall expansion sleeve 3 is installed on the outer diameter of the mandrel 2 and is fixed through a positioning pin 7, a piston 10 is installed in the inner hole of the mandrel 2, the left end of an adjusting locking screw 11 is embedded into a groove at the right end of the piston 10, meanwhile, the adjusting locking screw 11 is screwed into a screw hole at the right end of the mandrel 2, hydraulic oil 8 is sealed in a cavity formed between the mandrel 2 and the thin-wall expansion sleeve 3, and the cavity is sealed through an O-shaped ring I4 and an O-shaped ring II 9.

The using method comprises the following steps:

The workpiece is clamped, namely the locking plug 11 is screwed in and adjusted to move leftwards, the piston 10 is driven to move leftwards to squeeze the hydraulic oil 8, the hydraulic oil is incompressible, the hydraulic oil 8 forces the thin-wall expansion sleeve 3 to expand radially and press the inner hole wall of the workpiece 12, and therefore the workpiece 12 is centered and expanded.

The workpiece is loosened, the locking plug 11 is screwed out and adjusted to move rightwards, the piston 10 is driven to move rightwards to release pressure of the hydraulic oil 8, and the thin-wall expansion sleeve 3 is forced to restore to the original state under the action of elastic force, so that the workpiece 12 is taken down.

The mandrel clamp is simple and convenient to operate, has large clamping area, obviously improves the rigidity in the processing of the thin-wall part, and has particularly important significance in improving the coaxiality and the smoothness of the outer circle and reducing the deformation after processing on the premise of providing high centering precision and stability for the workpiece of which the inner hole is precisely processed and is required to process the outer circle of the thin wall.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims

1. A hydraulic expansion mandrel clamp, characterized in that it includes a connecting plate (1) mounted on a lathe packing (13), the inner hole of the connecting plate (1) is fixed with a mandrel (2) by a cylindrical head hexagon socket screw II (6), a thin-walled expansion sleeve (3) is provided on the outer diameter of the mandrel (2) through a positioning pin (7), a piston (10) is provided in the inner hole of the mandrel (2), an adjustment locking screw (11) is provided in the screw hole at the right end of the mandrel (2), and the left end of the adjustment locking screw (11) is embedded in the groove at the right end of the piston (10), an O-ring I (4) and an O-ring II (9) are respectively provided between the mandrel (2) and the thin-walled expansion sleeve (3), and between the piston (10) and the mandrel (2), a closed cavity is formed between the mandrel (2) and the thin-walled expansion sleeve (3), and hydraulic oil (8) is provided in the cavity.