CN210306831U

CN210306831U - Internal expansion type clamping device

Info

Publication number: CN210306831U
Application number: CN201921167615.8U
Authority: CN
Inventors: 朱建
Original assignee: Deyang Hanfeng Numerical Control Machinery Manufacture Co ltd
Current assignee: Deyang Hanfeng Numerical Control Machinery Manufacture Co ltd
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-04-14
Anticipated expiration: 2029-07-23

Abstract

The utility model provides an interior expanding clamping device relates to machining equipment technical field, and it includes interior bloated ware, and the axial is pegged graft in the centre bore of interior bloated ware has the tapering round pin, tapering round pin and interior bloated ware conical surface cooperation, the tip and the interior bloated ware threaded connection of tapering round pin. The inner expansion device comprises a chassis and an expansion sleeve fixed on the chassis, the expansion sleeve comprises a supporting platform and a limiting boss which are axially stacked and fixed along the expansion sleeve, a notch penetrating along the radial direction is arranged on the supporting platform, and the notch extends to the end face, far away from the supporting platform, of the limiting boss. The problems that in the prior art, workpieces with thin walls or irregular shapes are inconvenient to clamp, the workpieces are prone to deformation, and machining precision is reduced are solved.

Description

Internal expansion type clamping device

Technical Field

The utility model relates to a machining equipment technical field especially relates to an interior expanding clamping device.

Background

In the machining process, a machining object needs to be fixed through the clamping device, so that the machining object is located at an accurate position, a cutter can conveniently machine, and the machining efficiency and the machining precision of the machining object are directly influenced by the clamping effect of the clamping device. In the prior art, a three-jaw chuck is usually used for clamping a processing object, but for a thin-wall workpiece, if the thin-wall workpiece is clamped by the three-jaw chuck, the workpiece is easy to deform due to factors such as clamping and cutting force, and the processing precision and the use requirement of the workpiece are difficult to guarantee. The three-jaw chuck is used for clamping the excircle of a workpiece to process an inner hole, but the three-jaw chuck is inconvenient to clamp the workpiece with an irregular shape, so that the operation difficulty is increased.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned problem among the prior art, the utility model provides an interior expanding clamping device has solved among the prior art thin wall or the anomalous work piece centre gripping of appearance inconvenient and lead to the work piece to warp easily, reduce the problem of machining precision.

In order to achieve the purpose of the invention, the technical scheme adopted by the utility model is as follows:

the utility model provides an interior expanding clamping device, it includes interior bloated ware, and the axial is pegged graft in the centre bore of interior bloated ware has the tapering round pin, and tapering round pin and interior bloated ware conical surface cooperation, the tip and the interior bloated ware threaded connection of tapering round pin. The inner expansion device comprises a chassis and an expansion sleeve fixed on the chassis, the expansion sleeve comprises a supporting platform and a limiting boss which are axially stacked and fixed along the expansion sleeve, a notch penetrating along the radial direction is arranged on the supporting platform, and the notch extends to the end face, far away from the supporting platform, of the limiting boss.

Further, the expansion sleeve is integrally formed on a disc-shaped chassis, mounting holes are uniformly distributed on the chassis along the circumference, and the mounting holes penetrate through the chassis along the axial direction of the chassis. The clamping device can be fixed to a position convenient for clamping a workpiece through the mounting hole, and the stability of the clamping device is improved.

Furthermore, the supporting table is a circular table with the outer diameter larger than the maximum outer diameter of the workpiece, the bottom end of the supporting table is integrally formed on the chassis, and the notch penetrates through the middle of the supporting table along the top end of the supporting table in the axial direction of the supporting table. The top surface of the supporting table is used for supporting and bearing the workpiece, the outer diameter of the supporting table is larger than the maximum outer diameter of the workpiece, so that the bottom surface of the workpiece can be completely positioned on the top surface of the supporting table, the supporting strength of the workpiece is improved, and the workpiece is prevented from deforming when the workpiece is machined.

Furthermore, at least three gaps are uniformly distributed on the circumference of the supporting table. The expansion sleeve is separated by at least three gaps, so that the acting force of the expansion sleeve and the workpiece in the circumferential direction is more uniform when the expansion sleeve expands or extrudes in the radial direction.

Furthermore, the appearance of the limiting boss corresponds to the inner hole of the workpiece, the bottom end of the limiting boss is fixed on the top surface of the supporting table, and the notch penetrates through the limiting boss along the axial direction of the supporting table.

Furthermore, the center hole comprises a taper hole arranged on the inner side of the expansion sleeve and a threaded hole arranged on the inner side of the chassis, and the taper hole is coaxially connected with the threaded hole. The inner diameter of the conical hole along the axial direction changes gradually, and the outer diameter of the expansion sleeve can be changed by changing the matching position of the conical pin and the conical hole along the axial direction, so that the expansion sleeve can apply extrusion force to the inner hole of the workpiece to generate enough friction force to achieve the purpose of fixing the workpiece. The threaded hole can improve the moving distance precision of the taper pin along the axial direction, and can lock at any position, so that the structure is simplified, and the operation convenience is improved.

Furthermore, one end of the taper pin is a taper column matched with the conical surface of the taper hole, the other end of the taper pin is a stud connected with the threaded hole in a threaded mode, and the outer diameter of the stud is not larger than the minimum outer diameter of the taper column.

Further, the length of the small diameter end of the tapered hole is larger than that of the tapered column. And in the process of moving the taper pin to the small-diameter end, the small-diameter end of the taper hole is extruded by the taper pin, so that the internal expander is expanded.

Further, an inner hexagonal counter bore is formed in the end face, adjacent to the tapered column, of the tapered pin. The spanner is rotated through the connection of the inner hexagonal counter bore and the taper pin is rotated, and then the axial relative position of the taper pin and the inner expansion device is adjusted, the connection part of the spanner is set to be in the form of the inner hexagonal counter bore, so that the end part of the taper pin can sink into the workpiece, and the influence on the processing of the workpiece is avoided.

The utility model has the advantages that: the clamping device is simple in structure, convenient to install and low in manufacturing cost, and can clamp a workpiece in an outward expanding and expanding mode from an inner hole of the workpiece, so that deformation of the thin-wall part caused by a traditional clamping mode is avoided, internal support can be provided for the side wall of the thin-wall workpiece from the inside, the strength is improved, the thin-wall workpiece can bear larger cutting force, and the processing speed is improved; the outer part of the workpiece is not required to be clamped, so that the workpiece with an irregular shape can be clamped and fixed, the processing convenience is improved, and the operation difficulty is reduced.

Drawings

Fig. 1 is an exploded view of an internal expanding clamp.

Fig. 2 is a cross-sectional axial view of the expanding clamp.

Wherein, 1, an internal expander; 11. a chassis; 111. mounting holes; 12. an expansion sleeve; 121. a support table; 122. A limiting boss; 123. a notch; 13. a central bore; 131. a tapered hole; 132. a threaded hole; 2. a taper pin; 21. a tapered post; 22. a stud; 23. an inner hexagonal counter bore; 3. and (5) a workpiece.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and various changes will be apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all inventions contemplated by the present invention are protected.

As shown in fig. 1 and 2, the internal expansion type clamping device comprises an internal expander 1, a taper pin 2 is axially inserted into a central hole 13 of the internal expander 1, the taper pin 2 is in conical surface fit with the internal expander 1, and the end part of the taper pin 2 is in threaded connection with the internal expander 1. The internal expander 1 comprises a chassis 11 and an expansion sleeve 12 fixed on the chassis 11, wherein the expansion sleeve 12 comprises a supporting platform 121 and a limiting boss 122 which are stacked and fixed along the axial direction of the expansion sleeve 12, a gap 123 which penetrates along the radial direction is arranged on the supporting platform 121, and the gap 123 extends to the end face, far away from the supporting platform 121, of the limiting boss 122.

The central hole 13 comprises a taper hole 131 arranged on the inner side of the expansion sleeve 12 and a threaded hole 132 arranged on the inner side of the chassis 11, and the taper hole 131 and the threaded hole 132 are coaxially connected. One end of the taper pin 2 is a taper column 21 which is in taper fit with the taper hole 131, and the other end is a stud 22 which is in threaded connection with the threaded hole 132. The length of the tapered surface of the tapered column 21 is smaller than that of the tapered hole 131, the length of the tapered hole 131 along the small diameter end is larger than that of the tapered column 21, that is, the diameter of the large diameter end of the tapered hole 131 is the same as that of the large diameter end of the tapered column 21, and the length of the tapered hole 131 at the small diameter end is larger than that of the tapered column 21, so that the tapered column 21 is in tapered fit with the tapered surface of the tapered hole 131 after moving towards the small diameter end along the axial direction. The end face of the taper pin 2 adjacent to the taper column is provided with an inner hexagonal counter bore 23, and the inner hexagonal counter bore 23 corresponds to the shape and size of a standard wrench.

The expansion sleeve 12 is integrally formed on a disc-shaped chassis 11, mounting holes 111 are uniformly distributed on the chassis 11 along the circumference, and the mounting holes 111 are round holes which penetrate through the chassis 11 along the axial direction and are used for mounting connecting bolts. The supporting table 121 is a circular table with an outer diameter larger than the maximum outer diameter of the workpiece, the bottom end of the supporting table 121 is integrally formed on the chassis 11, and the notch 123 penetrates through the middle of the supporting table 121 along the top end thereof in the axial direction of the supporting table 121. At least three notches 123 are uniformly distributed along the circumference of the support table 121. The limiting boss 122 has an outer shape corresponding to the inner hole of the workpiece, the bottom end of the limiting boss is fixed on the top surface of the supporting table 121, and the notch 123 penetrates through the limiting boss 122 along the axial direction of the supporting table 121.

When the clamping device is used, the chassis 11 of the clamping device is fixed on a base, the limiting boss 122 is inserted into an inner hole of a workpiece 3, the end face of the workpiece 3 abuts against the supporting table 121, the taper pin 2 is inserted into the central hole 13, a spanner with a corresponding size is inserted into the hexagonal socket 23 to rotate the taper pin 2, the taper column 21 on the taper pin 2 is continuously extruded into the tapered hole 131 with the gradually reduced inner diameter along the axial direction, the expansion sleeve 12 is expanded, the outer side face of the limiting boss 122 extrudes the inner hole wall of the workpiece 3, sufficient friction force is applied to the workpiece 3 to achieve the purpose of clamping and fixing the workpiece 3, the end face of the taper pin 2 is lower than the end face of the workpiece 3, and after the workpiece 3 is fixed, the outer side face of the end face of the workpiece 3 can be processed.

Claims

1. The internal expansion type clamping device is characterized by comprising an internal expander (1), wherein a taper pin (2) is axially inserted into a central hole (13) of the internal expander (1), the taper pin (2) is in conical surface fit with the internal expander (1), and the end part of the taper pin (2) is in threaded connection with the internal expander (1);

the internal expanding device (1) comprises a chassis (11) and an expansion sleeve (12) fixed on the chassis (11), the expansion sleeve (12) comprises a supporting table (121) and a limiting boss (122) which are axially stacked and fixed along the expansion sleeve, a notch (123) which radially penetrates through the supporting table (121) is formed in the supporting table (121), and the notch (123) extends to the position, far away from the limiting boss (122), of the end face of the supporting table (121).

2. The internal expanding clamp device according to claim 1, wherein the expansion sleeve (12) is integrally formed on a disc-shaped base plate (11), the base plate (11) is provided with mounting holes (111) along the circumference, and the mounting holes (111) axially penetrate through the base plate (11).

3. The internal expanding clamp device according to claim 1, wherein the support table (121) is a circular table having an outer diameter larger than the maximum outer diameter of the workpiece, a bottom end of the support table (121) is integrally formed on the base plate (11), and the notch (123) penetrates from a middle portion of the support table (121) along a top end thereof in an axial direction of the support table (121).

4. An internal expanding clamp as claimed in claim 3, characterised in that said support table (121) is circumferentially provided with at least three said notches (123) uniformly distributed.

5. An internal expanding clamping device as claimed in claim 1 or 4, wherein the shape of the limit boss (122) corresponds to the inner hole of the workpiece and the bottom end of the limit boss is fixed on the top surface of the supporting platform (121), and the gap (123) penetrates through the limit boss (122) along the axial direction of the supporting platform (121).

6. An internal expanding clamp according to claim 1, characterised in that the central hole (13) comprises a conical hole (131) arranged inside the expansion sleeve (12) and a threaded hole (132) arranged inside the chassis (11), the conical hole (131) being coaxially connected with the threaded hole (132).

7. An internal expanding clamp as claimed in claim 6, wherein the taper pin (2) has a taper column (21) for taper fitting with the taper hole (131) at one end and a stud (22) for screw connection with the screw hole (132) at the other end, and the outer diameter of the stud (22) is not larger than the minimum outer diameter of the taper column (21).

8. An internal expanding clamp as claimed in claim 7, characterised in that the length of the small diameter end of the tapered bore (131) is greater than the length of the tapered post (21).

9. An internal expanding clamp as claimed in claim 7 or 8, characterised in that the end face of the tapered pin (2) adjacent the tapered post is provided with a hexagonal socket (23).