CN221388969U

CN221388969U - Tension mandrel clamp

Info

Publication number: CN221388969U
Application number: CN202322953630.8U
Authority: CN
Inventors: 唐蔷; 周浩
Original assignee: Frsky Electronic Co ltd
Current assignee: Frsky Electronic Co ltd
Priority date: 2023-11-02
Filing date: 2023-11-02
Publication date: 2024-07-23
Anticipated expiration: 2033-11-02

Abstract

The application provides a tension mandrel clamp, which comprises a mounting shaft with a cylindrical cross section, wherein one end of the mounting shaft is provided with a clamping end, and the clamping end is chamfered to form a guide inclined plane; the tensioning sleeve is provided with an inclined pushing block at one end of the inner wall of the tensioning sleeve, and one end of the tensioning sleeve, which is away from the inclined pushing block, is coaxially sleeved at the clamping end and is in sliding connection with the clamping end along the axial direction of the mounting shaft; the side, close to the guide inclined plane, of the inclined pushing block is provided with a first inclined plane in an adaptive guide inclined plane; the thread end of the tensioning screw coaxially extends into the mounting shaft from the clamping end and is in threaded connection with the mounting shaft; the nut end of the tensioning screw is abutted against the tensioning sleeve from one end of the tensioning sleeve forming inclined pushing block, so that the first inclined plane is abutted against the guiding inclined plane in parallel. The tensioning sleeve is pushed by the tensioning screw, so that the tensioning sleeve is tensioned from the inside of the workpiece, the workpiece is fixed, the clamping degree of the workpiece at the station is effectively improved, and the machining precision and the yield are improved; meanwhile, the application range of the tension mandrel clamp is effectively enlarged, and the practicability of the tension mandrel clamp is enhanced.

Description

Tension mandrel clamp

Technical Field

The application relates to the technical field of tool clamps, in particular to an expanding mandrel clamp.

Background

The fixture is used to fix the machining object fast, conveniently and safely during the machining process to occupy the correct position for construction or detection.

In the related art, such as CNC lathe machining, which mainly machines a rotating body workpiece; currently, in the industry, three-jaw chucks are commonly used to clamp workpieces when machining corresponding workpieces using CNC lathes. However, since the clamping angle of the workpiece on the three-jaw chuck is difficult to control accurately, the machining precision of the workpiece is difficult to ensure, the yield is low, and there is a need for improvement.

Disclosure of utility model

The application aims to provide a tension mandrel clamp which is used for improving the clamping precision of a workpiece at a construction station, further improving the machining precision of the corresponding workpiece and improving the yield.

The technical scheme provided by the application is as follows:

The application provides a tension mandrel clamp, which comprises:

The cross section of the mounting shaft is cylindrical, one end of the mounting shaft is a clamping end, and the clamping end is chamfered to form a guide inclined plane;

The tensioning sleeve is provided with an inclined pushing block in a matching manner with one end of the inner wall of the tensioning sleeve, one end of the tensioning sleeve, which is away from the inclined pushing block, is coaxially sleeved at the clamping end and is connected with the clamping end in a sliding manner along the axial direction of the mounting shaft; a first inclined plane is arranged on one side, close to the guide inclined plane, of the inclined pushing block, and the first inclined plane is in parallel abutting connection with the guide inclined plane;

The threaded end of the tensioning screw coaxially extends into the mounting shaft from the clamping end and is in threaded connection with the mounting shaft; the nut end of the tensioning screw abuts against the tensioning sleeve from one end of the inclined pushing block formed by the tensioning sleeve.

According to the tension mandrel clamp provided by the application, the rotator workpiece with the blind hole at the corresponding end part is coaxially sleeved on the tension sleeve from the opening end of the blind hole during specific processing; then, tightening the tightening screw, and pushing the nut end of the tightening screw to move towards one end of the mounting shaft, which is away from the clamping end; meanwhile, the first inclined surface in the tensioning sleeve extrudes the guide inclined surface, so that the tensioning sleeve radially expands outwards along the tensioning sleeve, the radius is increased until the tensioning sleeve is tensioned in the workpiece, and the workpiece is clamped on a corresponding station; when the workpiece needs to be taken down, the tightening screw is unscrewed, the nut end of the tightening screw is far away from the clamping end along the axial direction of the mounting shaft, the thrust applied to the tensioning sleeve disappears, and under the pushing action of the guide inclined plane, the tensioning sleeve retreats along the axial direction of the clamping end towards the nut end of the tightening screw, and the deformation and the elasticity are restored, so that the radius is restored to the original size; the inner wall of the workpiece and the outer wall of the tensioning sleeve generate a gap, and the workpiece can be taken off from the end part of the tensioning sleeve along the axial direction.

The rotary body workpiece is clamped in the mode, the tensioning sleeve coaxially sleeved on the clamping end of the cylindrical section is utilized to be tensioned from the blind hole of the workpiece and then fixed, coaxiality of the workpiece clamped at the station is guaranteed, and accordingly machining precision of the corresponding workpiece is improved, and yield is improved.

Meanwhile, as the tensioning sleeve is detachably sleeved at the clamping end of the mounting shaft, the tensioning sleeve with corresponding outer diameter size can be replaced according to blind holes with different sizes, so that clamping requirements of workpieces with different types are met, the application range of the tensioning mandrel clamp is effectively enlarged, and the practicability of the tensioning mandrel clamp is enhanced.

In some embodiments, a step inclined plane is formed in the middle of the clamping end, and the step inclined plane is parallel to the guide inclined plane; the inner wall of the tensioning sleeve is provided with a second inclined plane at one end deviating from the inclined pushing block, and when the first inclined plane abuts against the guiding inclined plane, the second inclined plane abuts against the step inclined plane in parallel.

According to the tension mandrel clamp provided by the application, the first inclined plane and the second inclined plane are respectively arranged at the two axial ends of the tension sleeve, so that when the nut end of the tension screw pushes the tension sleeve to move towards one end of the mounting shaft, which is away from the clamping end, the two ends of the tension sleeve expand synchronously, and the stability of clamping a workpiece on the tension mandrel clamp is improved.

In some embodiments, the tension sleeve is a spring steel tension sleeve.

According to the tension mandrel clamp provided by the application, the tension sleeve is manufactured by using the spring steel, so that the tensile strength and the elastic limit of the tension sleeve are improved, the structural strength of the tension sleeve under the repeated expansion and retraction conditions is ensured, and the service life of the tension sleeve is prolonged.

In some embodiments, a connecting hole is coaxially formed in the clamping end, and the threaded end of the tensioning screw penetrates through the connecting hole along the axis of the tensioning screw and is in sliding fit with the inner wall of the connecting hole;

The mounting shaft is provided with a mounting hole at one end deviating from the clamping end in a coaxial way, the radial dimension of the mounting hole is larger than that of the connecting hole, and an adjusting nut is coaxially and rotatably arranged in the mounting hole; the threaded end of the tensioning screw penetrates through the connecting hole and is screwed into the adjusting nut;

The device further comprises a driving piece, wherein the driving piece is used for driving the adjusting nut to rotate around the axis of the adjusting nut so as to enable the threaded end of the tensioning screw to rotate in a threaded mode relative to the adjusting nut.

According to the tension mandrel clamp provided by the application, the threaded end of the tensioning screw penetrates through the connecting hole and is then in threaded connection with the adjusting nut, so that the tensioning screw is mounted on the mounting shaft; the adjusting nut is driven by the driving piece to rotate around the shaft, so that the tensioning screw axially advances or retreats along the mounting shaft; when the blind hole is formed in the end portion of the workpiece, the tensioning screw is conveniently driven to axially displace, and the use convenience of the tension mandrel clamp is improved.

In some embodiments, the driving piece comprises a jack and a driving rod, the jack is arranged on the outer circular surface of the adjusting nut, a plurality of jacks are arranged around the axis circumference array of the adjusting nut, and any jack extends along the radial direction of the corresponding position of the adjusting nut; the driving rod penetrates through the corresponding jack along the radial direction of the position corresponding to the adjusting nut and is connected with the corresponding jack in a sliding mode.

According to the tension mandrel clamp, the driving rod is inserted into the corresponding insertion hole during specific processing, and the driving rod is pulled around the axis of the mounting shaft, so that the adjusting nut is driven to rotate relative to the tensioning screw, the driving structure is simple, the manufacturing and the use are convenient, the production cost of enterprises is saved, and the use convenience of the tension mandrel clamp is further improved.

In some embodiments, the outer wall of the mounting shaft is provided with a waist-shaped hole corresponding to the adjusting nut, and the length direction of the waist-shaped hole extends around the axis of the mounting shaft; one end of the driving rod, which is away from the jack, extends out of the outer circular surface of the mounting shaft from the waist-shaped hole.

According to the tension mandrel clamp provided by the application, the waist-shaped hole is used for limiting the angle range of each rotation of the driving rod, so that each displacement of the tensioning screw is limited, the tension sleeve is enabled to deform stably, the situation that the tension sleeve is cracked due to too strong force is reduced, and the stable operation of the workpiece clamping process is ensured.

In some embodiments, a transition section is formed coaxially between the nut end and the threaded end of the set screw;

The clamping end is internally provided with a supporting hole, and the radial dimension of the supporting hole is larger than that of the connecting hole and is coaxially communicated with the connecting hole; the transition section is in sliding fit with the inner wall of the supporting hole along the axis of the transition section and is rotationally connected with the clamping end around the axis of the transition section;

The threaded end of the tensioning screw penetrates through the supporting hole and the connecting hole in sequence and then is in threaded connection with the adjusting nut.

According to the tension mandrel clamp provided by the application, the inner wall of the clamping end is supported by the transition section, so that the condition that the clamping end collapses into the supporting hole in the expansion process of the tension sleeve is reduced, and the stability of clamping a workpiece by the tension mandrel clamp is further ensured.

In some embodiments, the radial dimension of the end of the mounting shaft axially facing away from the clamping end is greater than the radial dimension of the clamping end, and an abutment surface for abutment of the end wall of the workpiece is formed at the end of the clamping end facing away from the tensioning sleeve.

According to the tension mandrel clamp, during specific operation, the end wall of the workpiece is abutted against the abutting surface, so that the occurrence of the condition that the workpiece is displaced along the axial direction of the workpiece in the machining process is reduced, and the stability of clamping the workpiece by the tension mandrel clamp is improved.

In some embodiments, a flange is formed on an outer circumferential surface of the mounting shaft facing away from the end of the clamping end.

According to the tension mandrel clamp provided by the application, the flange plate structure is utilized to install the installation shaft on the processing station, so that the structure is simple, the operation is convenient, and the use convenience of the tension mandrel clamp is effectively ensured; meanwhile, the production difficulty of the tension mandrel clamp is reduced, and the production cost of enterprises is further reduced.

Compared with the prior art, the tension mandrel clamp provided by the application has at least one of the following beneficial effects:

1. The tensioning sleeve coaxially sleeved on the clamping end of the cylindrical section is utilized to tension and then fix the workpiece from the blind hole of the workpiece, so that coaxiality of clamping the workpiece at a station is guaranteed, machining precision of the corresponding workpiece is improved, and yield is improved; meanwhile, as the tensioning sleeve is detachably sleeved at the clamping end of the mounting shaft, the tensioning sleeve with corresponding outer diameter size can be replaced according to blind holes with different sizes, so that clamping requirements of workpieces with different types are met, the application range of the tensioning mandrel clamp is effectively enlarged, and the practicability of the tensioning mandrel clamp is enhanced.

2. The tensioning sleeve is manufactured by means of spring steel, and the first inclined plane and the second inclined plane are respectively arranged at the two axial ends of the tensioning sleeve, so that the structural strength of the tensioning sleeve is effectively ensured, the service life is prolonged, and the quality of the tensioning mandrel clamp is effectively improved while the axial sections of the tensioning sleeve are uniformly expanded or retracted;

3. Through set up adjusting nut in the installation axle to rotate through actuating lever drive adjusting nut, realize the drive to tensioning screw, simple structure, convenient production effectively guarantees the convenience when using this tension dabber anchor clamps, and saves enterprise manufacturing cost.

Drawings

The above features, technical features, advantages and implementation modes of the present invention will be further described in the following description of preferred embodiments with reference to the accompanying drawings in a clear and understandable manner.

FIG. 1 is an isometric view of an embodiment of the present application that is primarily representative of the overall structure of the tension mandrel clamp;

FIG. 2 is an exploded view of an embodiment of the present application, which mainly shows the opening positions of the guiding inclined plane and the step inclined plane;

FIG. 3 is a side view of an embodiment of the present application showing primarily the location of the mounting hole opening;

FIG. 4 is a cross-sectional view taken at an angle A-A of FIG. 3, and is primarily intended to represent the overall structure of the tension mandrel clamp.

Reference numerals illustrate:

1. A mounting shaft; 11. a clamping end; 111. a guide slope; 112. a step slope; 12. a flange plate; 13. an abutment surface; 14. a connection hole; 15. a mounting hole; 16. a waist-shaped hole; 17. a support hole; 2. a tensioning sleeve; 21. an inclined pushing block; 211. a first inclined surface; 22. a second inclined surface; 3. tightening the screw; 31. a transition section; 4. an adjusting nut; 41. and a jack.

Detailed Description

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will explain the specific embodiments of the present application with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the application, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.

For the sake of simplicity of the drawing, the parts relevant to the present application are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.

In one embodiment, referring to fig. 1 and 3 of the drawings in the specification, a tension mandrel clamp comprises a mounting shaft 1 and a tension sleeve 2 sleeved on the mounting shaft 1; in this embodiment of the present application, the cross section of the installation shaft 1 is cylindrical, one end of the installation shaft 1 is provided with a clamping end 11, and the end face of the clamping end 11 is chamfered to form a guiding inclined plane 111; one end of the inner wall of the tensioning sleeve 2 is provided with an inclined push block 21, and one end of the tensioning sleeve 2, which is away from the inclined push block 21, is coaxially sleeved at the clamping end 11 and is in sliding connection with the clamping end 11 along the axial direction of the tensioning sleeve; meanwhile, a first inclined surface 211 is arranged on the inclined pushing block 21, which is close to the guide inclined surface 111, and is matched with the guide inclined surface 111; the device also comprises a tensioning screw 3, wherein the threaded end of the tensioning screw 3 coaxially stretches into the mounting shaft 1 from the clamping end 11 and is in threaded connection with the mounting shaft 1; initially, the nut end of the tightening screw 3 is pressed against the tightening sleeve 2 from one end of the tightening sleeve 2 forming the inclined push block 21, and the first inclined surface 211 is pressed against the guide inclined surface 111 in parallel.

When a CNC lathe is used for machining a rotator workpiece, if a blind hole is formed in the end of the workpiece, the workpiece is coaxially sleeved to the outer circular surface of the tensioning sleeve 2 from the opening end of the blind hole, and then the tensioning screw 3 is screwed, so that the nut end of the tensioning sleeve is pushed to move towards one end of the mounting shaft 1, which is away from the clamping end 11; the expansion sleeve 2 expands radially outwards along the expansion sleeve, and the radius is increased due to the blocking effect of the guide inclined surface 111 on the first inclined surface 211, so that the expansion sleeve expands inside a workpiece, and the clamping of the workpiece on a corresponding station is realized; after the workpiece is processed, loosening the tension screw 3 to separate the nut end from the end of the tension sleeve 2, and withdrawing the thrust to the tension sleeve 2; under the pushing action of the guide inclined plane 111, the tensioning sleeve 2 slides along the axial direction of the mounting shaft 1 to the nut end of the tensioning screw 3, and simultaneously, the deformation is restored, the elasticity is released until the radius is restored to the original size; therefore, a gap is formed between the inner wall of the blind hole of the workpiece and the outer circular surface of the tensioning sleeve 2, and the workpiece can be removed from the end part of the tensioning sleeve 2 along the axial direction of the blind hole, so that the corresponding turning process is completed. The tensioning sleeve 2 with the circular cross section is utilized to tension the workpiece from the inside of the workpiece, so that the workpiece is fixed, the coaxiality of the workpiece clamped at the corresponding station is guaranteed, the machining precision of the corresponding workpiece is improved, and the yield is guaranteed.

Of course, the implementation mode of the application is not limited to the turning process, and any workpiece which is provided with a blind hole and can be internally tensioned can be clamped and fixed by using the tensioning mandrel clamp. And because the clamping end 11 of the installation shaft 1 is detachably sleeved with the tensioning sleeve 2, the tensioning sleeve 2 with corresponding outer diameter size can be replaced according to the size difference of blind holes on workpieces with different types, so that the clamping requirements of workpieces with different types are met, the application range of the tensioning mandrel clamp is effectively enlarged, and the applicability of the tensioning mandrel clamp is improved.

In one embodiment, based on the basis of the above-described embodiment, in particular with reference to fig. 1 to 4, a flange 12 is formed on the outer circumferential surface of the end of the mounting shaft 1 facing away from the clamping end 11; in actual production, the tension mandrel clamp is mounted on the use station by fastening bolts or the like through holes in the flange plate 12 so as to carry out subsequent processing operations.

In the embodiment of the application, the tensioning sleeve 2 is made of spring steel, so that the tensile strength and the elastic limit of the tensioning sleeve are improved, and the service life of the tensioning sleeve is prolonged; meanwhile, a second inclined plane 22 is formed at one end of the inner wall of the tensioning sleeve 2, which is away from the inclined push block 21; correspondingly, a step inclined plane 112 is formed in the middle of the clamping end 11, the small diameter size of the step inclined plane 112 is equal to the large diameter size of the guiding inclined plane 111, and the step inclined plane 112 is parallel to the guiding inclined plane 111 and is in parallel abutting connection with the second inclined plane 22.

In the initial state, the nut end of the tensioning screw 3 is abutted against one end of the inclined pushing block 21 formed by the tensioning sleeve 2, so that the first inclined surface 211 is abutted against the guide inclined surface 111, and the second inclined surface 22 is abutted against the step inclined surface 112; after the workpiece to be clamped is coaxially sleeved on the tensioning sleeve 2 from the opening end of the blind hole, the tensioning screw 3 is screwed, and the nut end of the tensioning screw 3 pushes the tensioning sleeve 2 to move towards one end of the mounting shaft 1, which is away from the clamping end 11; because of the blocking effect of the guide inclined plane 111 on the first inclined plane 211 and the blocking effect of the step inclined plane 112 on the second inclined plane 22, the two ends of the tensioning sleeve 2 are radially outwards expanded along the self-body, and the radius is increased, so that the tensioning sleeve is tensioned in the workpiece to fix the workpiece; after the workpiece is processed, loosening the tensioning screw 3 to enable the nut end of the tensioning screw to be separated from the end of the tensioning sleeve 2, and withdrawing the thrust action on the tensioning sleeve 2; under the pushing action of the guide inclined plane 111 and the step inclined plane 112, the tensioning sleeve 2 slides along the axial direction of the mounting shaft 1 to the nut end of the tensioning screw 3, and simultaneously, the deformation is recovered, the elasticity is released until the radius is recovered to the original size; therefore, a gap is formed between the inner wall of the blind hole of the workpiece and the outer circular surface of the tensioning sleeve 2, and the workpiece can be removed from the end part of the tensioning sleeve 2 along the axial direction of the blind hole, so that the corresponding turning process is completed.

Meanwhile, in this embodiment of the present application, referring to fig. 1 and 2, the installation shaft 1 is provided as a stepped shaft, the installation shaft 1 being axially located at the end of the grip end 11 facing away from the guide slope 111, and having a radial dimension larger than that of the grip end 11, so that an abutment surface 13 is formed at the end of the grip end 11 facing away from the guide slope 111; when the expansion mandrel clamp is used, a workpiece to be machined is coaxially sleeved on the outer circular surface of the expansion sleeve 2, the end face of the blind hole is abutted against the abutting face 13, so that the axial displacement of the corresponding workpiece is limited, and the stability of clamping the workpiece on the expansion mandrel clamp is improved.

Referring to fig. 4, a connecting hole 14 is coaxially formed in the clamping end 11, and the threaded end of the tensioning screw 3 penetrates through the connecting hole 14 along the axis of the tensioning screw and is in sliding fit with the inner wall of the connecting hole 14; meanwhile, one end of the mounting shaft 1, which is away from the clamping end 11, is coaxially provided with a mounting hole 15 with a radial dimension larger than that of the connecting hole 14, and an adjusting nut 4 is coaxially arranged in the mounting hole 15; when in use, the threaded end of the tensioning screw 3 penetrates through the connecting hole 14 and is screwed into the adjusting nut 4, so that the tensioning screw 3 is installed in the installation shaft 1; in addition, the mounting shaft 1 is further provided with a driving member, and the driving member is used for driving the adjusting nut 4 to rotate around the axis of the driving member relative to the inner wall of the mounting hole 15, so that the threaded end of the tensioning screw 3 rotates relative to the adjusting nut 4, and further the nut end of the tensioning screw 3 is displaced along the axial direction of the driving member.

Specifically, in this embodiment of the present application, the driving member includes a jack 41 and a driving rod, where the jack 41 is opened on an outer circumferential surface of the adjusting nut 4, and a plurality of jacks 41 are opened in circumferential arrays around an axis of the adjusting nut 4, and axial directions of the plurality of jacks 41 extend along a radial direction of a corresponding position of the adjusting nut 4; the driving rod is arranged on one driving rod; when the adjusting nut is used, the driving rod is axially inserted into any insertion hole 41 and then rotates around the axis of the adjusting nut 4, so that the adjusting nut 4 can be driven to rotate around the axis of the driving rod relative to the mounting shaft 1, namely relative to the tensioning screw 3. In addition, in this embodiment of the present application, in order to avoid that when the operator rotates the adjusting nut 4, the tension screw 3 is excessively displaced along the axial direction thereof and the tension sleeve 2 is cracked due to excessive force, the upper outer wall of the mounting shaft 1 is provided with a waist-shaped hole 16 corresponding to the position of the adjusting nut 4, and the length direction of the waist-shaped hole 16 extends around the rotation direction of the mounting shaft 1; in use, the driving rod extends from the waist-shaped hole 16 into the mounting hole 15 and is inserted into the corresponding jack 41, and one end of the driving rod, which is away from the jack 41, extends from the waist-shaped hole 16 to the outer circular surface of the mounting shaft 1 for holding.

In addition, in order to improve the convenience of assembling the tightening screw 3 and the adjusting nut 4, in this embodiment of the present application, a supporting hole 17 is further formed in the clamping end 11, and the radial dimension of the supporting hole 17 is greater than the radial dimension of the connecting hole 14 and is coaxially communicated with the connecting hole 14 and the mounting hole 15; meanwhile, a transition section 31 is coaxially formed between the nut end and the threaded end of the tensioning screw 3, and the transition section 31 is in sliding fit with the inner wall of the supporting hole 17 along the axis of the transition section 31 and is rotationally connected with the clamping end 11 around the axis of the transition section; during assembly, the threaded end of the tensioning screw 3 sequentially penetrates through the supporting hole 17 and the connecting hole 14 and then is in threaded connection with the adjusting nut 4 of the connecting hole 14, so that the tensioning screw 3 is detachably connected on the mounting shaft 1.

During concrete assembly, after the clamping end 11 is coaxially sleeved at one end of the tensioning sleeve 2, which is away from the inclined push block 21, the threaded end of the tensioning screw 3 sequentially penetrates through the supporting hole 17, the connecting hole 14 and the inner hole of the adjusting nut 4 and extends into the mounting hole 15, and is in threaded connection with the adjusting nut 4 until the nut end of the tensioning screw 3 is abutted against the tensioning sleeve 2 from one end of the tensioning sleeve 2, which forms the inclined push block 21, and the first inclined surface 211 is abutted against the guide inclined surface 111, so that the detachable connection of the tensioning sleeve 2 on the mounting shaft 1 is realized. When the tensioning sleeve 2 is replaced, the driving piece is used for driving the adjusting nut 4 to rotate relative to the tensioning screw 3 until the threaded end of the tensioning screw 3 is separated from the inner hole of the adjusting nut 4 and extends out of the mounting shaft 1 to the supporting hole 17; subsequently, the tension sleeve 2 is removed from the clamping end 11 and the tension sleeve 2 of the corresponding size is replaced to the clamping end 11.

The implementation principle of the embodiment of the application is as follows: when a CNC lathe is used for machining a rotator workpiece, if a blind hole is formed in the end of the workpiece, the workpiece is coaxially sleeved to the outer circular surface of the tensioning sleeve 2 from the opening end of the blind hole, and the end surface of the blind hole is abutted against the abutting surface 13; then, the adjusting nut 4 is rotated by the driving piece, so that the adjusting nut 4 rotates relative to the tensioning screw 3, the nut end of the tensioning screw 3 pushes the tensioning sleeve 2 to move towards one end of the mounting shaft 1, which is away from the clamping end 11, and the tensioning sleeve 2 expands radially outwards along the self under the blocking effect of the guide inclined plane 111 and the step inclined plane 112, so that the radius is increased, the tensioning sleeve is tensioned inside a workpiece, and the clamping of the workpiece on a corresponding station is realized; after the workpiece is processed, the adjusting nut 4 is reversely rotated by the driving piece, so that the nut end of the tensioning screw 3 reversely moves until the end part of the self-tensioning sleeve 2 is separated, and the thrust action on the self-tensioning sleeve 2 is removed; under the pushing action of the guide inclined plane 111 and the step inclined plane 112, the tensioning sleeve 2 slides along the axial direction of the mounting shaft 1 to the nut end of the tensioning screw 3, and simultaneously, the deformation is recovered, the elasticity is released until the radius is recovered to the original size; therefore, a gap is formed between the inner wall of the blind hole of the workpiece and the outer circular surface of the tensioning sleeve 2, and the workpiece can be removed from the end part of the tensioning sleeve 2 along the axial direction of the blind hole, so that the corresponding turning process is completed.

By adopting the mode, the workpiece is clamped at the corresponding station, so that the coaxiality of the workpiece clamped at the corresponding station is effectively ensured, the processing precision of the corresponding workpiece is further improved, and the yield is further improved; meanwhile, as the tensioning sleeve 2 is detachably sleeved on the clamping end 11, the tensioning sleeve 2 of the tensioning mandrel clamp can be replaced according to blind holes with different sizes when in use, the application range of the tensioning mandrel clamp is effectively enlarged, and the practicability of the tensioning mandrel clamp is enhanced.

It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.

Claims

1. An tension mandrel clamp, comprising:

2. The tension mandrel clamp as recited in claim 1 wherein a stepped ramp is provided in the middle of the clamping end, the stepped ramp being parallel to the guide ramp; the inner wall of the tensioning sleeve is provided with a second inclined plane at one end deviating from the inclined pushing block, and when the first inclined plane abuts against the guiding inclined plane, the second inclined plane abuts against the step inclined plane in parallel.

3. A tensioning mandrel clamp as claimed in claim 2 wherein the tensioning sleeve is a spring steel tensioning sleeve.

4. A tensioning mandrel clamp according to any one of claims 1 to 3, wherein a connecting hole is coaxially formed in the clamping end, and a threaded end of the tensioning screw penetrates through the connecting hole along the axis of the tensioning screw and is in sliding fit with the inner wall of the connecting hole;

The mounting shaft is provided with a mounting hole coaxially at one end deviating from the clamping end, the radial dimension of the mounting hole is larger than that of the connecting hole, and an adjusting nut is coaxially rotatably arranged in the mounting hole; the threaded end of the tensioning screw penetrates through the connecting hole and is screwed into the adjusting nut;

5. The tension mandrel clamp as claimed in claim 4, wherein the driving member comprises a jack and a driving rod, the jack is arranged on the outer circular surface of the adjusting nut, a plurality of jacks are arranged around the axis circumference of the adjusting nut in an array manner, and any jack extends along the radial direction of the corresponding position of the adjusting nut; the driving rod penetrates through the corresponding jack along the radial direction of the position corresponding to the adjusting nut and is connected with the corresponding jack in a sliding mode.

6. The tension mandrel clamp as recited in claim 5 wherein said mounting shaft outer wall defines a waist-shaped aperture corresponding to said adjustment nut, said waist-shaped aperture extending in a length direction about a rotational direction of said mounting shaft; one end of the driving rod, which is away from the jack, extends out of the outer circular surface of the mounting shaft from the waist-shaped hole.

7. The tension mandrel clamp as recited in claim 4 wherein a support hole is formed in said clamping end, said support hole having a radial dimension greater than a radial dimension of said connecting hole and being in coaxial communication with said connecting hole;

8. A tensioning mandrel clamp as claimed in claim 7 wherein a transition section is formed coaxially between the nut end and the threaded end of the tensioning screw, said transition section being in sliding engagement with the inner wall of the support bore along its own axis and being rotatably connected to the clamping end about its own axis.

9. A tensioning mandrel clamp as claimed in claim 1 wherein the radial dimension of the end of the mounting shaft axially facing away from the clamping end is greater than the radial dimension of the clamping end and forms an abutment surface for abutment of the end wall of the workpiece at the end of the clamping end facing away from the tensioning sleeve.

10. A tensioning mandrel clamp according to claim 1, wherein the outer circumferential surface of the mounting shaft at the end facing away from the clamping end is formed with a flange.