Inner supporting clamp for thin-walled tube workpieces
By designing the mounting base and pull rod driven slider structure of the internal support fixture, the deformation problem during the processing of thin-walled tubular workpieces was solved, and stable clamping and coaxiality were guaranteed.
Patent Information
- Application Number
- CN202520558724.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2035-03-27
AI Technical Summary
Thin-walled tubular workpieces are prone to deformation during processing, and the existing elastic internal expansion chucks are unstable, resulting in large processing errors.
Design an internal support clamp, including a mounting base, a pull rod, a slider, and a support block. The pull rod drives the slider to slide, causing the support block to tighten on the inner circumferential walls at both ends of the thin-walled tubular workpiece, ensuring uniform force distribution and preventing deformation.
It achieves stable clamping of thin-walled tubular workpieces, avoids processing deformation, ensures coaxiality, and improves processing accuracy.
Smart Images
Figure CN223970881U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mechanical technology and relates to an internal support clamp for thin-walled tubular workpieces. Background Technology
[0002] Tubular workpieces are a very common type of workpiece. After production, their end faces and outer diameters often need to be machined to ensure they meet usage requirements. Because the end faces and outer diameters need to be machined, and to avoid large machining errors in a single clamping, it is usually chosen to support and clamp them directly from the inside.
[0003] Currently, traditionally, these chucks are used in conjunction with flexible internal expansion chucks. These chucks expand outwards from the inside and tighten against the inner wall of the workpiece. The clamping position of the flexible internal expansion chuck is generally within the end of the tubular workpiece that needs machining, while the other end is essentially suspended. For thick-walled tubular workpieces, due to their inherent thickness, deformation is less likely to occur during machining even with one end tightened and the other suspended. However, for thin-walled tubular workpieces, with their very thin walls, deformation is easily caused during machining when one end is tightened and the other suspended, resulting in incorrect roundness. Utility Model Content
[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing an internal support fixture for thin-walled tubular workpieces, thus solving the problem of easy deformation during processing.
[0005] The objective of this utility model can be achieved through the following technical solutions:
[0006] An internal support fixture for thin-walled tubular workpieces includes a mounting base with a flange connection at the rear end and a pull rod that passes through the mounting base and can slide back and forth. The mounting base has several sliders 1 arranged circumferentially on its front side, with each slider 1 having a support block 1 fixedly connected to its outer end. The mounting base also has several sliders 2 arranged circumferentially on its middle side, with each slider 2 having a support block 2 fixedly connected to its outer end. Both support blocks 1 and 2 are fan-shaped and the same size circumferentially, and are staggered circumferentially. Moving the pull rod backward simultaneously drives each slider 1 and each slider 2 to slide outward from the mounting base.
[0007] In use, this internal support fixture is fixedly connected to the front end of the machine tool spindle via the flange connection of the mounting base. The pull rod is connected to the piston rod of the cylinder / hydraulic cylinder located inside the machine tool spindle. During machining, the thin-walled tubular workpiece is placed over the front end of the mounting base. Then, the cylinder / hydraulic cylinder drives the pull rod to move backward. As the pull rod moves, it simultaneously drives each slider one and each slider two to slide outward from the mounting base. This causes each support block one to abut against the inner peripheral wall of the front end of the thin-walled tubular workpiece, and each support block two to abut against the inner peripheral wall of the rear end of the thin-walled tubular workpiece. As a result, both ends of the thin-walled tubular workpiece are simultaneously tightened internally, thus firmly clamping the thin-walled tubular workpiece and ensuring that it will not deform during machining.
[0008] Moreover, both support block one and support block two are fan-shaped and are staggered in the circumferential direction. This ensures that the front and rear ends of the thin-walled tube workpiece are subjected to uniform force, while also ensuring the coaxiality of the clamped thin-walled tube workpiece and the machine tool spindle.
[0009] In the aforementioned internal support fixture for thin-walled tubular workpieces, a drive block 1 is fixedly connected to the front end of the pull rod along the axial direction, and each slider 1 surrounds the drive block 1 and is guided and engaged with the drive block 1. A drive block 2 is fixedly connected to the middle part of the pull rod along the axial direction, and each slider 2 surrounds the drive block 2 and is guided and engaged with the drive block 2.
[0010] By setting up drive block one and drive block two, a lever can simultaneously push each slider one and each slider two outward when it moves backward.
[0011] In the aforementioned internal support fixture for thin-walled tubular workpieces, the side of the drive block 1 is provided with several guide grooves 1 along the circumferential direction. Each guide groove 1 is arranged to extend through in the front-rear direction. The front end of the guide groove 1 is inclined away from the central axis of the pull rod relative to the rear end. The inner end of each slider 1 has a guide part 1. The shape of the guide part 1 matches the guide groove 1 and the guide part 1 is inserted into the corresponding guide groove 1.
[0012] The front end of guide groove one is inclined away from the central axis of the pull rod relative to the rear end. The inner end of slider one is provided with guide part one with the same shape as guide groove one. Guide part one is inserted into the corresponding guide groove one. In this way, when the pull rod drives drive block one to move backward, the slider one can be driven to move out of the mounting base by means of the cooperation between guide part one and guide groove one. Similarly, when the pull rod drives drive block one to move forward, the slider one can be driven to move into the mounting base by means of the cooperation between guide part one and guide groove one.
[0013] In the aforementioned internal support fixture for thin-walled tubular workpieces, the side of the drive block 2 is provided with several guide grooves 2 along the circumferential direction. Each guide groove 2 is arranged through the front and rear directions. The front end of the guide groove 2 is inclined away from the central axis of the pull rod relative to the rear end. The inner end of each slider 2 has a guide part 2. The shape of the guide part 2 matches the guide groove 2 and the guide part 2 is inserted into the corresponding guide groove 2.
[0014] The front end of guide groove two is inclined away from the central axis of the pull rod relative to the rear end. The inner end of slider two has a guide part one with the same shape as guide groove two, which is inserted into the corresponding guide groove two. Thus, when the pull rod drives drive block two to move backward, the slider two can be driven to move outward from the mounting base by the cooperation of guide part two and guide groove two. Similarly, when the pull rod drives drive block two to move forward, the slider two can be driven to move inward from the mounting base by the cooperation of guide part two and guide groove two.
[0015] In the aforementioned internal support fixture for thin-walled tubular workpieces, both support block one and support block two are made of nylon.
[0016] Both support block one and support block two are made of nylon, which can play a role in shock absorption during processing and avoid the phenomenon of tool vibration.
[0017] In the aforementioned internal support fixture for thin-walled tubular workpieces, the front end of the pull rod has an annular shoulder, the rear end of the pull rod is fixedly connected to a connector, a spacer is sleeved on the outside of the pull rod, a first drive block abuts between the spacer and the annular shoulder, and a second drive block abuts between the spacer and the connector.
[0018] Since the positions of the annular shoulder and the connector are constant, the drive block one is fixed axially with the pull rod by abutting between the spacer and the annular shoulder, and the drive block two is fixed axially with the pull rod by abutting between the spacer and the connector. Thus, when the pull rod moves, the drive block one can drive each slider one to move outward from the mounting base, and the drive block two can drive each slider two to move outward from the mounting base.
[0019] In the aforementioned internal support fixture for thin-walled tubular workpieces, the mounting base comprises, from back to front, a base body, an intermediate connecting body, and a cover, which are fixedly connected in sequence. The intermediate connecting body is a cylindrical shape with open ends. A first driving block is located inside the cover. The rear end side of the cover is provided with several first mounting grooves along the circumferential direction. Each slider is respectively located in each first mounting groove. The rear end of the cover abuts against the front end of the intermediate connecting body. A second driving block is located inside the front end of the base body. The front end side of the base body is provided with several second mounting grooves along the circumferential direction. Each slider is respectively located in each second mounting groove. The rear end of the intermediate connecting body abuts against the front end of the base body.
[0020] Compared with the prior art, the internal support fixture for thin-walled tubular workpieces has several sliders 1 arranged circumferentially on the side of the front end of the mounting base, and each slider 1 has a support block 1 fixedly connected to its outer end. Several sliders 2 are arranged circumferentially on the side of the middle part of the mounting base, and each slider 2 has a support block 2 fixedly connected to its outer end. During clamping, each support block 1 abuts against the inner circumferential wall of the front end of the thin-walled tubular workpiece, and each support block 2 abuts against the inner circumferential wall of the rear end of the thin-walled tubular workpiece. In this way, both ends of the thin-walled tubular workpiece are simultaneously tightened internally, so that the thin-walled tubular workpiece is firmly clamped and ensures that no deformation occurs during processing.
[0021] Moreover, both support block one and support block two are fan-shaped and are staggered in the circumferential direction. This ensures that the front and rear ends of the thin-walled tube workpiece are subjected to uniform force, while also ensuring the coaxiality of the clamped thin-walled tube workpiece and the machine tool spindle. Attached Figure Description
[0022] Figure 1 This is a three-dimensional schematic diagram of an internal support fixture used for thin-walled tubular workpieces.
[0023] Figure 2 This is a sectional view of an internal support fixture used for thin-walled tubular workpieces.
[0024] Figure 3 This is a schematic diagram showing the interaction between the pull rod, drive block one, slider one, drive block two, and slider two.
[0025] Figure 4 This is a schematic diagram showing the fit between slider one and the cover.
[0026] Figure 5 This is a schematic diagram showing the fit between slider two and the base.
[0027] Figure 6 This is a sectional view of the internal support fixture used for thin-walled tubular workpieces in the clamping state (sectioning angle and...). Figure 2 same).
[0028] In the figure, 1. Mounting base; 1a. Base body; 1a1. Flange connection; 1a2. Second mounting groove; 1b. Intermediate connecting body; 1b1. Clearance opening; 1c. Cover; 1c1. First mounting groove; 2. Tie rod; 2a. Annular shoulder; 3. Slider one; 3a. Guide part one; 4. Support block one; 5. Slider two; 5a. Guide part two; 6. Support block two; 7. Drive block one; 7a. Guide groove one; 8. Drive block two; 8a. Guide groove two; 9. Connector; 10. Spacer; 11. Thin-walled tube workpiece. Detailed Implementation
[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0030] like Figure 1 , Figure 2 and Figure 3 As shown, an internal support fixture for thin-walled tubular workpieces includes a mounting base 1 with a flange connection 1a1 at the rear end and a pull rod 2 passing through the mounting base 1. The pull rod 2 can slide back and forth. A plurality of sliders 3 are circumferentially arranged on the side of the front end of the mounting base 1, and a support block 4 is fixedly connected to the outer end of each slider 3. A plurality of sliders 5 are circumferentially arranged on the side of the middle part of the mounting base 1, and a support block 6 is fixedly connected to the outer end of each slider 5. Both support blocks 4 and 6 are fan-shaped and the same size circumferentially, and are staggered circumferentially. Moving the pull rod 2 backward can simultaneously drive each slider 3 and each slider 5 to slide outward from the mounting base 1. In this embodiment, there are three support blocks 4 and three support blocks 6, both with an arc of 60°, and both are made of nylon.
[0031] Specifically, such as Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a drive block 7 is fixedly connected to the front end of the pull rod 2 along the axial direction. Each slider 3 surrounds the drive block 7 and is guided and engaged with the drive block 7. A drive block 8 is fixedly connected to the middle of the pull rod 2 along the axial direction. Each slider 5 surrounds the drive block 8 and is guided and engaged with the drive block 8. The front end of the pull rod 2 has an annular shoulder 2a. A connector 9 is fixedly connected to the rear end of the pull rod 2. A spacer 10 is also sleeved on the outside of the pull rod 2. The drive block 7 abuts against the spacer 10 and the annular shoulder 2a, and the drive block 8 abuts against the spacer 10 and the connector 9. The mounting base 1 comprises, from back to front, a base body 1a, an intermediate connecting body 1b, and a cover 1c, which are fixedly connected in sequence. The flange connection part 1a1 is located at the rear end of the base body 1a. The fixed connection in sequence here refers to the fixed connection between the base body 1a and the intermediate connecting body 1b, and the fixed connection between the intermediate connecting body 1b and the cover 1c. The intermediate connecting body 1b is a cylindrical shape with open ends. The first drive block 7 is located inside the cover 1c. The rear side of the cover 1c has several first mounting grooves 1c1 along the circumferential direction. Each slider 3 is respectively located in each first mounting groove 1c1. The rear end of the cover 1c abuts against the front end of the intermediate connecting body 1b. The second drive block 8 is located inside the front end of the base body 1a. The front side of the base body 1a has several second mounting grooves 1a2 along the circumferential direction. Each slider 5 is respectively located in each second mounting groove 1a2. The rear end of the intermediate connecting body 1b abuts against the front end of the base body 1a. In practice, the intermediate connecting body 1b and the cover 1c are fixed together by a fastening screw that passes through the cover 1c and is threaded into the front end of the intermediate connecting body 1b. The side of the intermediate connecting body 1b is provided with several relief openings 1b1 along the circumferential direction. The intermediate connecting body 1b and the seat 1a are fixed together by a fastening screw that is threaded from the relief openings 1b1 to the seat 1a.
[0032] Specifically, such as Figure 3 , Figure 4 and Figure 5 As shown, the side of the drive block 7 has several guide grooves 7a along the circumferential direction. Each guide groove 7a is arranged through the front and rear directions. The front end of the guide groove 7a is inclined away from the central axis of the pull rod 2 relative to the rear end. The inner end of each slider 3 has a guide part 3a. The shape of the guide part 3a matches the guide groove 7a and is inserted into the corresponding guide groove 7a. The side of the drive block 8 has several guide grooves 8a along the circumferential direction. Each guide groove 8a is arranged through the front and rear directions. The front end of the guide groove 8a is inclined away from the central axis of the pull rod 2 relative to the rear end. The inner end of each slider 5 has a guide part 5a. The shape of the guide part 5a matches the guide groove 8a and is inserted into the corresponding guide groove 8a.
[0033] In use, this internal support fixture is fixedly connected to the front end of the machine tool spindle via the flange connection 1a1 of the mounting base 1. The connector 9 is fixedly connected to the piston rod of the cylinder / hydraulic cylinder located inside the machine tool spindle. During machining, the thin-walled tubular workpiece 11 is placed over the front end of the mounting base 1. Then, the cylinder / hydraulic cylinder drives the pull rod 2 to move backward. The drive block 7 and drive block 8 move backward together with the pull rod 2. As the drive block 7 moves backward, it pushes each slider 3 outward, causing each support block 4 to abut against the inner peripheral wall of the front end of the thin-walled tubular workpiece 11. As the drive block 8 moves backward, it pushes each slider 5 outward, causing each support block 6 to abut against the inner peripheral wall of the rear end of the thin-walled tubular workpiece 11. In this way, both ends of the thin-walled tubular workpiece 11 are simultaneously stretched outward (as shown in the image). Figure 6 As shown in the diagram, the thin-walled tubular workpiece 11 is firmly clamped. Moreover, both the first support block 4 and the second support block 6 are fan-shaped and are staggered circumferentially. This ensures that the front and rear ends of the thin-walled tubular workpiece 11 are subjected to uniform force, while also ensuring the coaxiality of the clamped thin-walled tubular workpiece 11 with the machine tool spindle.
[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
Claims
1. An inner supporting clamp for thin-walled tubular workpieces, comprising a mounting base (1) provided with a flange connection portion (1a1) at the rear end and a pull rod (2) capable of sliding forward and backward through the mounting base (1), characterized in that, The side of the front end of the mounting base (1) is provided with a plurality of sliding blocks one (3) in the circumferential direction, the outer end of each sliding block one (3) is fixedly connected with a support block one (4), the side of the middle part of the mounting base (1) is provided with a plurality of sliding blocks two (5) in the circumferential direction, the outer end of each sliding block two (5) is fixedly connected with a support block two (6), the support block one (4) and the support block two (6) are both in the form of a sector in the circumferential direction and are the same size, the support block one (4) and the support block two (6) are staggered in the circumferential direction, and the rear movement of the pull rod (2) can simultaneously drive each sliding block one (3) and each sliding block two (5) to slide outwardly of the mounting base (1).
2. An internal bolster fixture for thin-walled tubular workpieces as defined in claim 1, wherein, The front end of the pull rod (2) is fixedly connected with a driving block one (7) in the axial direction, each sliding block one (3) surrounds the driving block one (7) and is in guiding cooperation with the driving block one (7), and the middle part of the pull rod (2) is fixedly connected with a driving block two (8) in the axial direction, each sliding block two (5) surrounds the driving block two (8) and is in guiding cooperation with the driving block two (8).
3. An internal bolster fixture for thin walled tubular workpieces as defined in claim 2 wherein, The side of the driving block one (7) is provided with a plurality of guiding grooves one (7a) in the circumferential direction, each guiding groove one (7a) is provided through in the front-rear direction, and the front end of the guiding groove one (7a) is inclinedly arranged in the direction away from the central axis of the pull rod (2) relative to the rear end, and the inner end of each sliding block one (3) has a guiding portion one (3a), the shape of the guiding portion one (3a) is matched with the guiding groove one (7a), and the guiding portion one (3a) is inserted into the corresponding guiding groove one (7a).
4. An internal bolster fixture for thin walled tubular workpieces as defined in claim 2 wherein, The side of the driving block two (8) is provided with a plurality of guiding grooves two (8a) in the circumferential direction, each guiding groove two (8a) is provided through in the front-rear direction, and the front end of the guiding groove two (8a) is inclinedly arranged in the direction away from the central axis of the pull rod (2) relative to the rear end, and the inner end of each sliding block two (5) has a guiding portion two (5a), the shape of the guiding portion two (5a) is matched with the guiding groove two (8a), and the guiding portion two (5a) is inserted into the corresponding guiding groove two (8a).
5. An internally braced fixture for thin-walled tubular workpieces as defined in claim 1, wherein, The support block one (4) and the support block two (6) are both nylon parts.
6. An internally supported clamp for thin-walled tubular workpieces as defined in claim 3 or 4, wherein, The front end of the pull rod (2) has an annular shoulder (2a), the rear end of the pull rod (2) is fixedly connected with a connector (9), the pull rod (2) is further sleeved with a spacer sleeve (10), the driving block one (7) abuts between the spacer sleeve (10) and the annular shoulder (2a), and the driving block two (8) abuts between the spacer sleeve (10) and the connector (9).
7. An internally braced fixture for thin-walled tubular workpieces as defined in claim 6, wherein, The mounting base (1) comprises a seat body (1a), an intermediate connector (1b) and a cover (1c) from back to front and the three are fixedly connected in sequence, the intermediate connector (1b) is in a cylinder type with two open ends, the driving block one (7) is located in the cover (1c), the rear end side of the cover (1c) is provided with a plurality of first installation grooves (1c1) in the circumferential direction, each sliding block one (3) is arranged in each first installation groove (1c1), the rear end of the cover (1c) abuts against the front end of the intermediate connector (1b), the driving block two (8) is located in the front end of the seat body (1a), the front end side of the seat body (1a) is provided with a plurality of second installation grooves (1a2) in the circumferential direction, each sliding block two (5) is arranged in each second installation groove (1a2), the rear end of the intermediate connector (1b) abuts against the front end of the seat body (1a).