CN112453969A

CN112453969A - Workpiece clamping device

Info

Publication number: CN112453969A
Application number: CN202011237355.4A
Authority: CN
Inventors: 钟弟昌
Original assignee: Shanghai Yiya Precision Machinery Co ltd
Current assignee: Shanghai Yiya Precision Machinery Co ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-03-09

Abstract

The embodiment of the invention provides a workpiece clamping device which comprises a centre, a drive plate, a bearing, a fixed ring, an elastic body, a clamping body and an expansion sleeve, wherein the centre is fixed on a workpiece headstock, the drive plate is fixed on a rotatable motor or a drive part, the drive plate is provided with an annular groove, the fixed ring is connected with the drive plate, the drive plate is provided with a first interface, the first interface is communicated with a second interface on the clamping body through a pipeline, the fixed ring is provided with a pressure inlet, the clamping body and the expansion sleeve are assembled into a whole, a pressure cavity is arranged in the expansion sleeve, the second interface is communicated with the pressure cavity, a workpiece is tightly attached to the centre through a tailstock or external force, the workpiece is clamped by the expansion sleeve. The invention is used together with the centre to drive the workpiece to rotate with high precision. The clamping portion may be allowed to be eccentric and angularly deflected relative to the drive portion. In the case of using the tip, clamping with a small axial force is performed. Can have high rigidity in the rotating direction. Synchronous rotation of the driving part and the workpiece is realized. Realizing positive and negative rotation.

Description

Workpiece clamping device

Technical Field

The invention relates to the technical field of changed processing equipment, in particular to a workpiece clamping device.

Background

The processing of shaft type work piece usually carries out on lathe, grinding machine, needs to carry out the clamping with current work piece then processing, and current clamping device has following defect:

1. the clamping force of the device with power cannot be controlled, and the driving workpiece can jump greatly;

2. unpowered devices, such as centrifugal chucks, can achieve small runout, but are prone to slippage;

3. the driving part and the workpiece can not move synchronously;

4. the driving part cannot be driven reversely;

5. can not be matched with the tip for use.

Disclosure of Invention

The embodiment of the invention provides a workpiece clamping device which can drive a workpiece to rotate with high precision.

The technical scheme adopted by the invention is as follows:

the embodiment of the invention provides a workpiece clamping device which comprises a centre, a drive plate, a bearing, a fixed ring, an elastic body, a clamping body and an expansion sleeve, wherein the centre is fixed on a workpiece headstock, the drive plate is fixed on a rotatable motor or a drive part, the drive plate is provided with an annular groove, the fixed ring is connected with the drive plate, the drive plate is provided with a first interface, the first interface is communicated with a second interface on the clamping body through a pipeline, the fixed ring is provided with a pressure inlet, the clamping body and the expansion sleeve are assembled into a whole, a pressure cavity is arranged in the expansion sleeve, the second interface is communicated with the pressure cavity, a workpiece is tightly attached to the centre through a tailstock or external force, the workpiece is clamped by the expansion sleeve.

In one embodiment of the invention, the fixed ring is connected to the dial by a bearing or a sliding fit.

In one embodiment of the invention, the fixed ring and the dial are free to rotate relative to each other.

In one embodiment of the invention, the surfaces of the two sides of the annular groove, which are matched with the fixed ring, are sealed through gaps or contact.

In one embodiment of the invention, the expansion sleeve and the clamping body are in a sealed or tight fit.

In an embodiment of the invention, the drive plate and the clamping body are coupled through an elastic body.

In one embodiment of the present invention, the elastomer is a diaphragm or bellows.

The invention has the following beneficial effects:

1. the workpiece can be driven to rotate with high precision by matching with the center.

2. The clamping portion may be allowed to be eccentric and angularly deflected relative to the drive portion.

3. The clamping with small axial force can be carried out under the condition that the tip is used.

4. Can have high rigidity in the rotating direction. Synchronous rotation of the driving part and the workpiece is realized.

5. Can realize positive and negative rotation.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic diagram of an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

The invention adopts a hydraulic, pneumatic or elastic clamping mode. The clamping part and the driving part are flexibly connected, and the clamping part is provided with a hydraulic or pneumatic inlet. The clamping portion may allow for eccentric and axial angular deflection relative to the drive portion. The drive section provides hydraulic or pneumatic inlets and outlets. The driving part is two parts capable of moving relatively, and a sealing device or structure is arranged between the two parts capable of moving relatively.

As shown in the figure, the embodiment of the invention provides a workpiece clamping device, which comprises a tip 2, a drive plate 3, a bearing 4, a fixed ring 5, an elastic body 6, a clamping body 7 and an expansion sleeve 8, wherein the tip 2 is fixed on a fixed workpiece headstock, and the drive plate 3 is fixed on a rotatable motor or a driving part to realize the rotation motion synchronous with the driving. The dial plate 3 is provided with an annular groove A, the fixed ring 5 is connected with the dial plate 3 through a bearing or sliding fit, the fixed ring 5 and the dial plate 3 can rotate freely relative to each other, and the two sides of the annular groove A and the surface matched with the fixed ring are sealed through gaps or other sealing modes, so that the fluid in the annular groove A is not leaked. Meanwhile, the dial plate 3 is provided with a port I P which is communicated with a port II C on the clamping body 7 through a pipeline E, and the cavity is communicated when the dial plate 3 and the fixed ring 5 move relatively or are forbidden. The fixed ring 5 has a pressure inlet P for fluid (oil pressure or air pressure, etc.) access. The clamping body 7 and the expansion sleeve 8 are assembled into a whole, a pressure cavity D is arranged in the expansion sleeve 8, fluid in the pressure cavity D is prevented from leaking between the expansion sleeve 8 and the clamping body 7 through sealing or tight fit, and the interface II C is communicated with the pressure cavity D. Fluid with pressure enters the annular cavity A through the pressure inlet P, enters the pressure cavity D through the first connector B, the pipeline E and the second connector C, and deforms the expansion sleeve 8, so that a workpiece is clamped. The workpiece 1 is tightly attached to the center through a tailstock or external force, and positioning of the workpiece is achieved. The workpiece 1 is clamped by the expansion sleeve 8. The dial 3 and the clamping body 7 are connected through an elastic body 6, wherein the elastic body can be a diaphragm, a bellows or other structural parts. The elastic body 6 can transmit the power of the drive plate 3 to the clamping body 7 so as to realize the synchronous rotation of the workpieces. The elastomer 6 may correct for non-concentricity of the axis and angular direction of the expansion sleeve 8 and the dial 3. The workpiece 1 is ensured to be only subjected to torsion, and the workpiece 1 is prevented from bending deformation.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a work piece clamping device, a serial communication port, including top, the driver plate, a bearing, the retainer plate, the elastomer, the holding body with expand the cover, it is top on being fixed in the work piece headstock, the driver plate is fixed in on rotatable motor or the drive part, there is the annular groove on the driver plate, the retainer plate is connected with the driver plate, the driver plate is equipped with interface one, interface one is through two intercommunications of interface on pipeline and the holding body, the retainer plate is equipped with the pressure entry, the holding body assembles integratively with the cover that expands, it is equipped with the pressure chamber to expand the cover the inside, interface two and pressure chamber intercommunication, the work piece is hugged closely top through tailstock or external force, the work piece is pressed.

2. A workpiece clamping apparatus as claimed in claim 1 wherein the retainer is connected to the drive plate by a bearing or a sliding fit.

3. A workpiece holding device as claimed in claim 2, wherein the fixed ring and the catch plate are free to rotate relative to one another.

4. A workpiece clamping device as claimed in claim 1 wherein the surfaces on both sides of the annular groove which engage the fixed ring are sealed by clearance or contact.

5. A workpiece clamping apparatus as claimed in claim 1 wherein the expansion sleeve and the clamping body are in a sealed or tight fit.

6. The workpiece clamping device as recited in claim 1, wherein the drive plate is coupled to the clamping body through an elastomer.

7. A workpiece holding device as claimed in claim 1, characterised in that the elastomer is a diaphragm or bellows.