Core shaft expansion sleeve clamp

By designing a mandrel-shaft clamp with an equidistant outer stop-rotation inclined surface and an inner stop-rotation inclined surface, the problem of large torque transmission and low machining accuracy in the prior art is solved, and high-precision workpiece clamping and processing effect is achieved .

CN222198947UActive Publication Date: 2024-12-20SHANDONG HAOXIN MACHINERY CO LTD
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Patent Information

Application Number
CN202420648692.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-03-29
Publication Date
2024-12-20
Estimated Expiration
2034-03-29

AI Technical Summary

Technical Problem

When the existing tapered mandrel and swelling fixtures drive the rotary body workpiece to rotate, they cannot meet the requirements of large torque transmission and heavy cutting processing, and sliding friction is prone to occur during use, resulting in a smaller cone angle, reducing machining accuracy.

Method used

A mandrel expansion sleeve fixture is designed, including axle shift assembly, positioning plate, mandrel and expansion sleeve. The mandrel is equipped with an equidistant outer stopping slope, and the inner wall of the swell is equipped with a suitable inner stopping rotation. The inclined surface is driven to move the swell along the axis through the shaft shifting component to realize torque transmission, and to form an adaptation through the inclined surface of the inner stopping and the outer stopping slope to avoid sliding friction.

Benefits of technology

It realizes the transmission of large torque, meets the requirements of integrated machining, improves processing accuracy and product quality, avoids taper changes, and extends the service life of the fixture.

✦ Generated by Eureka AI based on patent content.

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Abstract

A mandrel expansion sleeve clamp comprises a shaft moving assembly used for being in driving connection with an axial power piece; the positioning disc coaxially sleeves the outer side of the axial movement assembly, and one end of the positioning disc is fixedly connected with a machine tool; the mandrel is coaxially arranged on the outer side of the shaft moving assembly in a sleeving mode, the mandrel comprises a mandrel connecting part and a conical part, the mandrel connecting part is fixedly connected with the other end of the positioning disc, and a plurality of outer rotation stopping slopes distributed around the axis of the mandrel at equal intervals are formed in the conical part; the expansion sleeve and the shaft moving assembly are coaxially arranged, the expansion sleeve is arranged on the outer side of the conical part in a sleeving mode, an inner rotation stopping inclined face matched with the outer rotation stopping inclined face is arranged on the inner wall of the expansion sleeve, and the shaft moving assembly drives the expansion sleeve to reciprocate along the axis of the expansion sleeve. According to the utility model, large-torque transmission can be carried out on the expansion sleeve through the mandrel, and the rough and fine integrated processing requirement is met; and moreover, the processing precision is high, and the product yield is improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of machine tool processing devices, in particular to a core shaft expansion sleeve clamp. Background Art

[0002] With the rapid development of the automotive industry, the requirements for products have also increased. The integration of parts has become a trend in the future. The integration of parts means that the requirements for technology are getting higher and higher, and the rigidity and torque of the fixture are a new challenge. There are many types of machine tool fixtures, and tension clamping is one of the clamping methods, which is used in the fixture to center and clamp the processed parts.

[0003] After the fixture has tightened and clamped the rotating workpiece, it needs to drive the rotating workpiece to rotate together. During the rotation process, high-precision centering and large rotational torque transmission are required to meet the requirements of subsequent rough and fine machining. However, most existing fixtures use the friction between the tapered mandrel and the expansion sleeve to drive the rotating workpiece to rotate together. The torque transmission of the rotating workpiece is limited by this and cannot meet the requirements of large torque transmission and heavy cutting. Moreover, during machining, sliding friction is formed between the outer surface of the tapered mandrel and the inner surface of the expansion sleeve, which is prone to wear after a period of use, resulting in a smaller taper angle, a decrease in clamping accuracy, and a reduction in machining accuracy. Utility Model Content

[0004] In view of this, the technical problem to be solved by the utility model is: to provide a mandrel expansion sleeve clamp, which can transmit large torque to the expansion sleeve through the mandrel to meet the requirements of integrated rough and fine processing; moreover, the processing accuracy is high, and the product yield is improved.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A mandrel expansion sleeve fixture, comprising:

[0007] A shaft shifting assembly, used for driving connection with the axial power member;

[0008] A positioning plate, the positioning plate is coaxially sleeved on the outer side of the shaft shift assembly, and one end of the positioning plate is used for fixed connection with the machine tool;

[0009] A mandrel, the mandrel is coaxially sleeved on the outer side of the shaft shift assembly, the mandrel comprises a mandrel connecting portion and a tapered portion, the mandrel connecting portion is fixedly connected to the other end of the positioning plate, and the tapered portion is provided with a plurality of external anti-rotation inclined surfaces equidistantly arranged around the axis of the mandrel;

[0010] The expansion sleeve is coaxially arranged with the shaft shifting assembly, the expansion sleeve is arranged on the outside of the conical portion, an inner anti-rotation inclined surface matched with the outer anti-rotation inclined surface is opened on the inner wall of the expansion sleeve, and the shaft shifting assembly drives the expansion sleeve to reciprocate along its axis.

[0011] Preferably, the number of the outer anti-rotation inclined surfaces and the number of the inner anti-rotation inclined surfaces are both three.

[0012] Preferably, the angle between the outer anti-rotation inclined surface and the horizontal plane, and the angle between the inner anti-rotation inclined surface and the horizontal plane are both 6°.

[0013] Preferably, the axis shift assembly comprises:

[0014] A pull rod piston, one end of which passes through the positioning plate and is arranged inside the core shaft connecting part;

[0015] A pull rod is threadedly connected to the pull rod piston, one end of the pull rod passes through the core shaft and is located outside the expansion sleeve, and a limiting portion abutting against the expansion sleeve is provided on the pull rod.

[0016] Preferably, a clamping groove is concavely provided on one end surface of the expansion sleeve, and a clamping protrusion matched with the clamping groove is convexly provided on the limiting portion.

[0017] Preferably, the axis shift assembly further comprises:

[0018] A plurality of thrust pins, each of which penetrates through the core shaft connecting portion; a pin hole is formed on the pull rod piston, and one end of the thrust pin is received in the pin hole;

[0019] A thrust ring is sleeved on the outer side of the conical portion, a clamping notch is provided on the thrust ring, the other end of the thrust pin is clamped in the clamping notch, and the thrust ring abuts against the expansion sleeve.

[0020] Preferably, it further comprises a positioning ring, wherein the positioning ring is coaxially sleeved on the outer side of the thrust ring, and the positioning ring is fixedly connected to the core shaft connecting portion.

[0021] Preferably, at least two sealing rings are arranged between the pull rod piston and the inner wall of the core shaft connecting portion.

[0022] Preferably, the expansion sleeve comprises three expansion blocks which are equidistantly arranged around the axis of the expansion sleeve, and an elastic filling piece is provided between two adjacent expansion blocks.

[0023] Preferably, the positioning plate is provided with a receiving groove for receiving the core shaft connecting portion.

[0024] After adopting the above technical solution, the beneficial effects of the utility model are:

[0025] In the utility model, an axis shifting assembly, a positioning disk, a core shaft and an expansion sleeve are provided, wherein the core shaft comprises a core shaft connecting portion and a tapered portion, the core shaft connecting portion is fixedly connected to the positioning disk, the tapered portion is provided with a plurality of outer anti-rotation inclined surfaces equidistantly arranged around the axis of the core shaft, the expansion sleeve is sleeved on the outer side of the tapered portion, and an inner anti-rotation inclined surface matched with the outer anti-rotation inclined surface is provided on the inner wall of the expansion sleeve, the axis shifting assembly can drive the expansion sleeve to reciprocate along its axis, and when the axis shifting assembly drives the expansion sleeve to move away from the core shaft, the inner anti-rotation inclined surface does not abut against the outer anti-rotation inclined surface, the diameter of the expansion sleeve does not change, and the expansion sleeve can be extended into the inner hole of the workpiece. When the sleeve moves to the side close to the core shaft, the inner anti-rotation bevel abuts against the outer anti-rotation bevel and continues to move, the diameter of the expansion sleeve becomes larger, and the inner hole of the workpiece is supported to clamp and fix the workpiece; when the spindle on the machine tool drives the axis shifting assembly, core shaft, expansion sleeve, and workpiece to rotate together through the positioning plate, the workpiece will generate angular rotation torque. At this time, the inner anti-rotation bevel abuts against the outer anti-rotation bevel and adapts to form torque transmission, thereby meeting the requirements of large torque transmission and heavy cutting processing; moreover, when the workpiece is processed, there is no sliding friction between the outer surface of the core shaft and the inner surface of the expansion sleeve, which will not affect the taper change, thereby improving the processing accuracy and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Figure 1 This is a structural schematic diagram of a mandrel expansion sleeve fixture according to an embodiment of the utility model;

[0028] Figure 2 yes Figure 1 Exploded diagram of

[0029] Figure 3 is a cross-sectional view of the embodiment of the utility model after the workpiece is assembled;

[0030] Figure 4 yes Figure 2 Schematic diagram of the structure of the central shaft;

[0031] Figure 5 yes Figure 4 A cross-sectional view of

[0032] Figure 6 yes Figure 2 Schematic diagram of the structure of the mid-rise set;

[0033] Figure 7 yes Figure 6 A cross-sectional view of

[0034] Figure 8 yes Figure 2 Schematic diagram of the structure of the middle tie rod;

[0035] In the figure:

[0036] 1. Axis shift assembly; 11. Tie rod piston; 111. Pin hole; 12. Tie rod; 121. Limiting portion; 122. Snap-fit ​​protrusion; 13. Push pin; 14. Thrust ring; 141. Snap-fit ​​notch;

[0037] 2. Positioning plate; 21. Accommodating slot;

[0038] 3. Mandrel; 31. Mandrel connecting portion; 32. Conical portion; 33. External anti-rotation inclined surface;

[0039] 4. expansion sleeve; 41. inner anti-rotation inclined surface; 42. clamping groove; 43. expansion block; 44. elastic filling piece;

[0040] 5. Positioning ring;

[0041] 6. Sealing ring;

[0042] 7. Workpiece. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0044] like Figures 1 to 8 As shown in the figure, the utility model includes:

[0045] Axis shift assembly 1, used for driving connection with an axial power member (not shown in the figure);

[0046] A positioning plate 2, the positioning plate 2 is coaxially sleeved on the outer side of the shaft shift assembly 1, and one end of the positioning plate 2 is used for fixed connection with a machine tool (not shown in the figure);

[0047] The mandrel 3 is coaxially sleeved on the outer side of the shaft shift assembly 1. The mandrel 3 includes a mandrel connecting portion 31 and a tapered portion 32. The mandrel connecting portion 31 is fixedly connected to the other end of the positioning plate 2. The tapered portion 32 is provided with a plurality of outer anti-rotation inclined surfaces 33 equidistantly arranged around the axis of the mandrel 3. The positioning plate 2 is concavely provided with a receiving groove 21 for receiving the mandrel connecting portion 31.

[0048] The expansion sleeve 4 is coaxially arranged with the shaft shifting assembly 1, and the expansion sleeve 4 is sleeved on the outer side of the tapered portion 32. The inner wall of the expansion sleeve 4 is provided with an inner anti-rotation inclined surface 41 which is matched with the outer anti-rotation inclined surface 33. The shaft shifting assembly 1 drives the expansion sleeve 4 to reciprocate along its axis.

[0049] When the axial shifting assembly 1 drives the expansion sleeve 4 to move away from the core shaft 3, the inner anti-rotation bevel 41 does not abut against the outer anti-rotation bevel 33, and the diameter of the expansion sleeve 4 does not change, so the expansion sleeve 4 can be extended into the inner hole of the workpiece 7. When the expansion sleeve 4 moves toward the side close to the core shaft 3, the inner anti-rotation bevel 41 abuts against the outer anti-rotation bevel 33 and continues to move, and the diameter of the expansion sleeve 4 becomes larger, supporting the inner hole of the workpiece 7 to clamp and fix the workpiece 7; when the spindle on the machine tool drives the axial shifting assembly 1, the core shaft 3, the expansion sleeve 4, and the workpiece 7 to rotate together through the positioning plate 2, the workpiece 7 will generate angular rotation torque. At this time, the inner anti-rotation bevel 41 abuts against and adapts to the outer anti-rotation bevel 33 to form torque transmission, thereby meeting the requirements of large torque transmission and heavy cutting processing; moreover, when the workpiece 7 is processed, there is no sliding friction between the outer surface of the core shaft 3 and the inner surface of the expansion sleeve 4, which will not affect the taper change, thereby improving the processing accuracy and improving the product quality.

[0050] In the present invention, there are three outer anti-rotation bevels 33 and three inner anti-rotation bevels 41, and the conical portion 32 forms a triangular arc cone structure. Preferably, the angle between the outer anti-rotation bevel 33 and the horizontal plane, and the angle between the inner anti-rotation bevel 41 and the horizontal plane are both 6°.

[0051] In the present utility model, the shaft shift assembly 1 comprises:

[0052] A pull rod piston 11, one end of which passes through the positioning plate 2 and is arranged inside the core shaft connecting part 31, and at least two sealing rings 6 are arranged between the pull rod piston 11 and the inner wall of the core shaft connecting part 31;

[0053] The pull rod 12 is threadedly connected to the pull rod piston 11 , one end of the pull rod 12 passes through the core shaft 3 and is located outside the expansion sleeve 4 , and a limiting portion 121 abutting against the expansion sleeve 4 is provided on the pull rod 12 .

[0054] Among them, a clamping groove 42 is concavely provided on one end surface of the expansion sleeve 4, and a clamping protrusion 122 adapted to the clamping groove 42 is convexly provided on the limiting portion 121. When the limiting portion 121 drives the expansion sleeve 4 to move toward the side close to the core shaft 3, the clamping protrusion 122 is clamped in the clamping groove 42 to effectively limit the expansion sleeve 4, limiting the expansion sleeve 4 to move along its axis to prevent deviation.

[0055] Moreover, the axis shift assembly 1 further comprises:

[0056] A plurality of thrust pins 13 are provided, the thrust pins 13 penetrate the core shaft connecting portion 31; a pin hole 111 is provided on the pull rod piston 11, and one end of the thrust pin 13 is received in the pin hole 111;

[0057] The thrust ring 14 is sleeved on the outer side of the tapered portion 32 . A clamping notch 141 is provided on the thrust ring 14 . The other end of the thrust pin 13 is clamped in the clamping notch 141 . The thrust ring 14 abuts against the expansion sleeve 4 .

[0058] When the axial shift assembly 1 moves toward the side close to the workpiece 7, the pull rod piston 11 drives the thrust ring 14 to move in the same direction through the thrust pin 13. The thrust ring 14 abuts against the expansion sleeve 4, pushing the expansion sleeve 4 to move toward the side close to the workpiece 7, that is, to move away from the core shaft 3. The inner anti-rotation bevel 41 does not abut against the outer anti-rotation bevel 33, so the expansion sleeve 4 can be extended into the inner hole of the workpiece 7.

[0059] The mandrel expansion sleeve fixture also includes a positioning ring 5, which is coaxially sleeved on the outer side of the thrust ring 14 and fixedly connected to the mandrel connecting portion 31. The positioning ring 5 is provided to locate the position of the workpiece 7 and also to determine the depth of the expansion sleeve 4 extending into the inner hole of the workpiece 7.

[0060] In the utility model, the expansion sleeve 4 includes three expansion blocks 43 equidistantly arranged around the axis of the expansion sleeve 4, and an elastic filling piece 44 is arranged between two adjacent expansion blocks 43. The elastic filling piece 44 is an elastic rubber filling piece, which can elastically adjust the gap between the core shaft 3 and the inner hole of the workpiece 7 to ensure processing accuracy and efficiency, and has the advantage of high stability.

[0061] Before the utility model is used, it is first installed on the machine tool through the positioning plate 2. Under the drive of the machine tool, the expansion sleeve 4 extends into the inner hole of the workpiece 7, and the axial power member pulls the pull rod piston 11, driving the pull rod 12 to move to the side away from the workpiece 7. The limit portion 121 drives the expansion sleeve 4 to move in the same direction, and the inner anti-rotation inclined surface 41 abuts against the outer anti-rotation inclined surface 33 and continues to move. The expansion sleeve 4 slides on the surface of the tapered portion 32, and the diameter of the expansion sleeve 4 becomes larger to clamp and fix the inner hole of the workpiece 7. After that, the machine tool spindle drives the mandrel expansion sleeve fixture and the workpiece 7 rotates together to carry out the processing procedure. During the processing, the core shaft 3 drives the expansion sleeve 4 to rotate together through the outer anti-rotation bevel 33 adapted to the inner anti-rotation bevel 41, which is used to transmit a large torque and realize the rotation of the workpiece 7. After the processing is completed, the pull rod piston 11 drives the pull rod 12 to move toward the side close to the workpiece 7. Under the action of the anti-rotation thrust pin 13 and the thrust ring 14, the expansion sleeve 4 is driven to move toward the side close to the workpiece 7. The diameter of the expansion sleeve 4 is reduced until it returns to its original state and is separated from the workpiece 7. Then the workpiece 7 is removed to complete the processing procedure.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mandrel expansion sleeve fixture, It is characterized in that include: A shaft shifting assembly, used for driving connection with the axial power member; A positioning plate, the positioning plate is coaxially sleeved on the outer side of the shaft shift assembly, and one end of the positioning plate is used for fixed connection with the machine tool; A mandrel, the mandrel is coaxially sleeved on the outer side of the shaft shift assembly, the mandrel comprises a mandrel connecting portion and a tapered portion, the mandrel connecting portion is fixedly connected to the other end of the positioning plate, and the tapered portion is provided with a plurality of external anti-rotation inclined surfaces equidistantly arranged around the axis of the mandrel; The expansion sleeve is coaxially arranged with the shaft shifting assembly, the expansion sleeve is arranged on the outside of the conical portion, an inner anti-rotation inclined surface matched with the outer anti-rotation inclined surface is opened on the inner wall of the expansion sleeve, and the shaft shifting assembly drives the expansion sleeve to reciprocate along its axis.

2. The mandrel expansion sleeve fixture according to claim 1, It is characterized in that The number of the outer anti-rotation inclined surfaces and the number of the inner anti-rotation inclined surfaces are both three.

3. The mandrel expansion sleeve fixture according to claim 1, It is characterized in that The included angle between the outer anti-rotation inclined surface and the horizontal plane, and the included angle between the inner anti-rotation inclined surface and the horizontal plane are both 6°.

4. The mandrel expansion sleeve fixture according to claim 1, It is characterized in that The axis shift assembly comprises: A pull rod piston, one end of which passes through the positioning plate and is arranged inside the core shaft connecting part; A pull rod is threadedly connected to the pull rod piston, one end of the pull rod passes through the core shaft and is located outside the expansion sleeve, and a limiting portion abutting against the expansion sleeve is provided on the pull rod.

5. The mandrel expansion sleeve fixture as claimed in claim 4, It is characterized in that A clamping groove is concavely provided on one end surface of the expansion sleeve, and a clamping protrusion matched with the clamping groove is convexly provided on the limiting portion.

6. The mandrel expansion sleeve fixture as claimed in claim 4, It is characterized in that The axis shift assembly also includes: A plurality of thrust pins, each of which penetrates through the core shaft connecting portion; a pin hole is formed on the pull rod piston, and one end of the thrust pin is received in the pin hole; A thrust ring is sleeved on the outer side of the conical portion, a clamping notch is provided on the thrust ring, the other end of the thrust pin is clamped in the clamping notch, and the thrust ring abuts against the expansion sleeve.

7. The mandrel expansion sleeve fixture as claimed in claim 6, It is characterized in that It also includes a positioning ring, which is coaxially sleeved on the outer side of the thrust ring and fixedly connected to the core shaft connecting part.

8. The mandrel expansion sleeve fixture as claimed in claim 4, It is characterized in that At least two sealing rings are arranged between the pull rod piston and the inner wall of the core shaft connecting portion.

9. The mandrel expansion sleeve fixture according to claim 1, It is characterized in that The expansion sleeve comprises three expansion blocks which are equidistantly arranged around the axis of the expansion sleeve, and an elastic filling piece is arranged between two adjacent expansion blocks.

10. The mandrel expansion sleeve fixture according to claim 1, It is characterized in that The positioning plate is concavely provided with an accommodating groove for accommodating the core shaft connecting portion.