Positioning device for machining circular holes in inner sides of sleeve parts

Abstract

The utility model provides a positioning device for machining circular holes in the inner sides of sleeve parts, which belongs to the field of machining tools and comprises a vertical positioning component and a horizontal positioning component. The vertical positioning assembly comprises a threaded rod, a magnetic base is fixedly installed at one end of the threaded rod, and the magnetic base can be attracted to the inner surface of a to-be-machined workpiece. When the end, away from the magnetic base, of the threaded rod is inserted into a process hole, coaxial with a drill bit, of the rear end of the electric drill, the threaded sleeve can abut against a shell of the electric drill. The horizontal positioning assembly comprises a positioning frame, the positioning frame is provided with a workpiece connecting hole and a workpiece positioning hole, and when the workpiece connecting hole is aligned with a machined hole in the workpiece to be machined, the workpiece positioning hole is aligned with a hole to be machined in the workpiece to be machined. The utility model has the beneficial effects that the moving path is ensured to be a straight line when an on-site operator holds an electric drill by hand to process an inner side circular hole, and the precision of the processed circular hole is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of processing tools, and in particular relates to a positioning device used for processing circular holes on the inner sides of sleeve-type parts. Background Art

[0002] Sleeve-type components are widely used in machining. From giant sleeves in heavy industrial equipment to miniature cylindrical components in precision instruments, sleeves, with their unique hollow rotating structure, play a crucial role in supporting and positioning mechanical transmission systems. Furthermore, through precise coordination with shaft components, they enable efficient force transmission and precise motion control, making them an indispensable foundational component in modern industrial systems.

[0003] Currently, the machining of conventional sleeve-like parts typically requires drilling holes on their end faces to form connecting holes that mate with other parts. Furthermore, for certain sleeve-like parts with special technical requirements, high-precision drilling is also required on the sleeve's inner cylindrical surface, in addition to drilling holes on the end faces, to ensure accurate assembly and reliable fit of these parts with other components.

[0004] However, in traditional handheld electric drill operation scenarios, it is difficult for operators to ensure that the electric drill maintains linear motion throughout the entire drilling process, which can easily lead to the drilled hole being skewed and the hole coordinates being out of tolerance, thus failing to meet design expectations. In addition, the processed sleeve parts will have particularly prominent problems in subsequent machining, assembly operations and other processes, affecting the assembly accuracy of the sleeve parts with other components, and even directly causing subsequent component functions to fail in severe cases. Utility Model Content

[0005] The purpose of the utility model is to propose and design a positioning device for processing circular holes on the inner side of sleeve-type parts in response to the problem that it is difficult to ensure the accuracy during the processing of inner circular holes of existing sleeve-type parts, so as to ensure that when on-site workers use a handheld electric drill to process the inner circular holes of sleeve-type parts, the moving path of the electric drill is a straight line, thereby ensuring the accuracy of the processed circular holes.

[0006] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is: a positioning device for processing circular holes on the inner side of sleeve-type parts, which includes a vertical positioning component and a horizontal positioning component; the vertical positioning component includes a threaded rod, one end of the threaded rod is fixedly installed with a magnetic base, and the magnetic base can be adsorbed on the inner surface of the workpiece to be processed; the other end of the threaded rod is threadedly connected to a threaded sleeve, when the end of the threaded rod away from the magnetic base is inserted into the process hole coaxial with the drill bit at the rear end of the electric drill, the threaded sleeve can abut against the outer shell of the electric drill; the horizontal positioning component includes a positioning frame, and the positioning frame is provided with a workpiece connecting hole and a workpiece positioning hole. When the workpiece connecting hole is aligned with the processed hole on the workpiece to be processed, the workpiece positioning hole is aligned with the hole to be processed of the workpiece to be processed. At this time, when applying the utility model to process the inner circular hole of metal sleeve-type parts, the vertical positioning component and the horizontal positioning component can be first installed inside the workpiece to be processed, and the magnetic base can be adsorbed on the top of the inner wall of the workpiece to be processed. The threaded rod is coaxially arranged with the hole to be processed, and the workpiece positioning hole on the positioning frame is aligned with the hole to be processed. Then, the end of the threaded rod is plugged into the process hole existing at the rear end of the electric drill. At this time, the operator can manually rotate the threaded sleeve, and control the threaded sleeve to move downward along the threaded rod through the rotation of the threaded sleeve, and push the electric drill downward through the threaded sleeve. The drill bit installed on it is driven by the electric drill to move downward in the workpiece positioning hole, and finally a linear drilling action is achieved.

[0007] Furthermore, the positioning frame includes an arc plate and a straight plate. The arc plate has a workpiece connection hole formed on its sector-shaped surface, a fixing slot formed on its inner arc surface, and a straight plate positioning hole formed at the bottom of the fixing slot. One end of the straight plate has a workpiece positioning hole formed on it, and the other end of the straight plate is located within the fixing slot and has a straight plate connection hole formed on it. A straight plate fastener passes through the straight plate connection hole and is threadedly connected to the straight plate positioning hole, thereby connecting the arc plate and the straight plate. Furthermore, when the positioning frame is installed on the workpiece to be processed, the positioning frame can be directly installed using the connection holes already machined on the end face, inner flange, or outer flange of the workpiece to be processed. In this case, the workpiece connection holes provided on the arc plate of the positioning frame can be first aligned with the already machined connection holes (i.e., the aforementioned machined holes) on the workpiece to be processed. The arc plate can then be mounted on the workpiece to be processed using fasteners such as bolts, thereby completing the installation of the entire positioning frame on the workpiece to be processed and aligning the workpiece positioning holes with the holes to be processed on the workpiece to be processed. In addition, for the holes to be processed of sleeve-type parts of different specifications, and the holes to be processed at different positions, arc plates and straight plates of different sizes can be used, and positioning frames of corresponding specifications can be assembled by selecting arc plates and straight plates of different specifications; or multiple workpiece connecting holes can be directly set at different positions on the same arc plate, and multiple workpiece positioning holes and straight plate connecting holes can be set at different positions on the same straight plate, so as to meet the needs of workpieces to be processed of different specifications by selecting workpiece connecting holes, workpiece positioning holes, and straight plate connecting holes at different positions.

[0008] Furthermore, the arc plate is provided with at least two groups of workpiece connecting holes in the radial direction. Thus, when it is used for sleeve-like parts of different sizes, the workpiece connecting holes at different positions can be selected to cooperate with the sleeve-like parts.

[0009] Furthermore, at least one rotating rod is provided on the outside of the threaded sleeve, and when a plurality of rotating rods are provided, all the rotating rods can be evenly arranged on the outside of the threaded sleeve along the circumferential direction.

[0010] Furthermore, the threaded sleeve includes a slide and a nut. The slide is mounted on the outside of the threaded rod, and the nut is threaded onto the outside of the threaded rod. The lower end of the nut abuts the upper end of the slide, and the outer side of the nut is fixedly connected to the rotating rod. At this time, the operator can manually rotate the rotating rod to drive the nut to rotate, and the rotation of the nut controls the nut to move downward along the threaded rod. The nut pushes the slide downward, which in turn pushes the electric drill downward, and the electric drill drives the drill bit installed in it downward, ultimately achieving a linear drilling action.

[0011] Furthermore, the outer diameter of the slide cylinder is larger than the diameter of the process hole provided at the rear end of the electric drill, so as to ensure that the slide cylinder can push the electric drill to move downward.

[0012] In addition, the utility model also provides another positioning device for processing circular holes on the inner side of sleeve-type parts, which includes a vertical positioning component and a horizontal positioning component; the vertical positioning component includes a threaded rod, one end of the threaded rod is fixedly installed with a magnetic base, and the magnetic base can be adsorbed on the inner surface of the workpiece to be processed; the other end of the threaded rod is threadedly connected with a threaded sleeve; the vertical positioning component also includes a fixed insert, the fixed insert is fixedly installed on the rear end of the electric drill and is coaxially arranged with the drill bit of the electric drill, when the end of the threaded rod away from the magnetic base is plugged into the fixed insert, the threaded sleeve abuts against the fixed insert; the horizontal positioning component includes a positioning frame, the positioning frame is provided with a workpiece connecting hole and a workpiece positioning hole, when the workpiece connecting hole is aligned with the processed hole on the workpiece to be processed, the workpiece positioning hole is aligned with the hole to be processed in the workpiece to be processed. At this time, when applying the present invention to process the inner circular hole of a metal sleeve-like part, the vertical positioning assembly and the horizontal positioning assembly can be first installed inside the workpiece to be processed, and the magnetic base can be adsorbed on the top of the inner wall of the workpiece to be processed. The threaded rod is coaxially arranged with the hole to be processed, and the workpiece positioning hole on the positioning frame is aligned with the hole to be processed; then the end of the threaded rod is plugged into the fixed insert installed at the rear end of the electric drill; at this time, the operator can manually rotate the threaded sleeve and control the threaded sleeve to move downward along the threaded rod through the rotation of the threaded sleeve, push the fixed insert and the electric drill downward through the threaded sleeve, and drive the drill bit installed therein to move downward in the workpiece positioning hole through the electric drill, and finally achieve a linear drilling action. In order to ensure the drilling effect, the insertion depth of the threaded rod and the fixed insert should be greater than the depth of the drilled hole.

[0013] Furthermore, the positioning frame includes an arc plate and a straight plate, the sector surface of the arc plate is provided with a workpiece connecting hole, the inner arc surface of the arc plate is provided with a fixing slot, and the bottom of the fixing slot is provided with a straight plate positioning hole; one end of the straight plate is provided with a workpiece positioning hole, and the other end of the straight plate is located in the fixing slot and provided with a straight plate connecting hole, and the straight plate fastener passes through the straight plate connecting hole and is threadedly connected to the straight plate positioning hole, thereby realizing the connection between the arc plate and the straight plate.

[0014] Furthermore, the arc plate is provided with at least two groups of workpiece connecting holes in the radial direction. Thus, when it is used for sleeve-like parts of different sizes, the workpiece connecting holes at different positions can be selected to cooperate with the sleeve-like parts.

[0015] Furthermore, at least one rotating rod is provided on the outside of the threaded sleeve, and when a plurality of rotating rods are provided, all the rotating rods can be evenly arranged on the outside of the threaded sleeve along the circumferential direction.

[0016] It can be seen from the above technical solution that the utility model has the following advantages: when the utility model is applied to process the inner circular hole of metal sleeve-type parts, it can guide the moving path of the electric drill through the cooperation between the vertical positioning component, the horizontal positioning component and the process holes of the electric drill itself, or through the cooperation between the vertical positioning component, the horizontal positioning component and the fixed insert fixedly installed at the rear end of the electric drill, so as to ensure that the moving path of the electric drill is a straight line, thereby ensuring the accuracy of the processed circular hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;

[0019] Figure 2 This is a schematic structural diagram of the threaded sleeve in the utility model;

[0020] Figure 3 This is a schematic structural diagram of the threaded rod and magnetic base in the utility model;

[0021] Figure 4 This is a schematic structural diagram of the arc plate in the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the straight plate in the utility model;

[0023] Figure 6 This is a schematic structural diagram of a workpiece to be processed in the present utility model;

[0024] Figure 7 This is a schematic structural diagram of Example 2 of the present utility model;

[0025] Figure 8 This is a structural diagram of an electric drill and a fixed insert in Example 2 of the present utility model.

[0026] In the figure: 1. Workpiece to be processed; 2. Magnetic base; 3. Threaded rod; 4. Rotating stick; 5. Threaded sleeve; 6. Electric drill; 7. Straight plate; 8. Arc plate; 9. Straight plate fastener; 10. Process hole; 11. Slide; 12. Nut; 13. Straight plate positioning hole; 14. Sector surface; 15. Fixing slot; 16. Workpiece connecting hole; 17. Straight plate connecting hole; 18. Workpiece positioning hole; 19. Hole to be processed; 20. Fixing insert; 21. Drill bit; 22. Positioning frame. DETAILED DESCRIPTION

[0027] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0028] Example 1

[0029] This embodiment provides a first positioning device for machining a circular hole inside a sleeve-type part, which is mainly suitable for an electric drill 6 having a process hole 10 coaxial with a drill bit 21 at the rear end, such as the model 01132 704 produced by Robert Bosch GmbH.

[0030] like Figure 1 As shown, it includes a vertical positioning component and a horizontal positioning component. Figure 3 As shown, the vertical positioning assembly includes a threaded rod 3, one end of which is fixedly mounted with a magnetic base 2. The permanent magnet in the magnetic base 2 can be used to adsorb the magnetic base 2 on the top of the inner surface of the metal workpiece 1 to be processed, so as to fix the threaded rod 3 in the workpiece 1 to be processed. The other end of the threaded rod 3 can be directly inserted into the process hole 10 coaxial with the drill bit 21 at the rear end of the electric drill 6, and the insertion depth of the threaded rod 3 in the process hole 10 needs to be greater than the depth of the drilled hole. The outer side of the threaded rod 3 is threadedly connected to a threaded sleeve 5. Figure 2 As shown, the threaded sleeve 5 includes a slide 11 and a nut 12. The slide 11 is slidably mounted on the outside of the threaded rod 3, and the nut 12 is threadedly connected to the outside of the threaded rod 3, and the lower end of the nut 12 is in contact with the upper end of the slide 11. At least one rotating rod 4 is fixedly connected to the outside of the nut 12, and the outer diameter of the slide 11 is larger than the diameter of the process hole 10 provided at the rear end of the electric drill 6. At this time, when the threaded rod 3 in the vertical positioning assembly is plugged into the electric drill 6, the operator can manually rotate the rotating rod 4 to drive the nut 12 to rotate, and control the nut 12 to move downward along the threaded rod 3 through the rotation of the nut 12, and push the slide 11 downward through the nut 12, push the electric drill 6 downward through the slide 11, and drive the drill bit 21 installed thereon to move downward through the electric drill 6, and finally realize the linear drilling action.

[0031] like Figure 1 、 Figure 4 、 Figure 5As shown, the horizontal positioning assembly includes a positioning frame 22, and the positioning frame 22 includes an arc plate 8 and a straight plate 7. The sector surface 14 of the arc plate 8 is provided with a workpiece connection hole 16, and is installed on the end face or flange of the workpiece 1 to be processed through the workpiece connection hole 16. Specifically in the first embodiment, the workpiece connection hole 16 provided on the arc plate 8 of the positioning frame 22 can be aligned with the connection hole (i.e. the above-mentioned processed hole) that has been processed on the workpiece 1 to be processed, and then the arc plate 8 can be installed on the workpiece 1 to be processed by using fasteners such as bolts and the workpiece connection hole 16 and the connection hole that has been processed on the workpiece 1 to be processed, thereby achieving the fixation and installation of the arc plate 8. At the same time, the first embodiment also provides a fixing groove 15 on the inner arc surface of the arc plate 8, and a straight plate positioning hole 13 is provided at the bottom of the fixing groove 15, and the connection between the arc plate 8 and the straight plate 7 is achieved through the fixing groove 15. As shown Figure 5 As shown, in this embodiment, a workpiece positioning hole 18 is formed at one end of the straight plate 7, and a straight plate connecting hole 17 is formed at the other end of the straight plate 7. The end of the straight plate 7 with the straight plate connecting hole 17 is placed in the fixing slot 15, and the straight plate fastener 9 is passed through the straight plate connecting hole 17 and then threadedly connected to the straight plate positioning hole 13, thereby achieving the connection between the arc plate 8 and the straight plate 7. Moreover, when the arc plate 8, the straight plate 7 and the workpiece 1 to be processed are assembled together, that is, when the workpiece connecting hole 16 is aligned with the processed hole in the workpiece 1 to be processed, the workpiece positioning hole 18 is aligned with the hole 19 to be processed in the workpiece 1 to be processed.

[0032] At this time, when applying this embodiment to Figure 6 When the metal sleeve-type parts shown are used for inner circular hole processing, the vertical positioning assembly and the horizontal positioning assembly can be first installed inside the workpiece 1 to be processed, and the magnetic base 2 can be adsorbed on the top of the inner wall of the workpiece 1 to be processed. The threaded rod 3 is coaxially arranged with the hole 19 to be processed, and the workpiece positioning hole 18 on the positioning frame 22 is aligned with the hole 19 to be processed. Then, the end of the threaded rod 3 is plugged into the process hole 10 existing at the rear end of the electric drill 6; at this time, the operator can manually rotate the threaded sleeve 5, and control the threaded sleeve 5 to move downward along the threaded rod 3 through the rotation of the threaded sleeve 5, push the electric drill 6 downward through the threaded sleeve 5, and drive the drill bit 21 installed thereon to move downward in the workpiece positioning hole 18 through the electric drill 6, and finally realize the linear drilling action.

[0033] Furthermore, in this embodiment, at least two sets of workpiece connection holes 16 can be radially provided on the arc plate 8. This allows for the use of sleeve-like parts of varying sizes by selecting workpiece connection holes 16 at different locations to accommodate the sleeve-like parts. Furthermore, the embodiment can utilize arc plates 8 and straight plates 7 of varying sizes, and by selecting arc plates 8 and straight plates of varying specifications to assemble corresponding positioning frames 22, thereby meeting the machining requirements for the holes 19 to be machined in sleeve-like parts of varying sizes and at varying locations.

[0034] Example 2

[0035] like Figure 7 、 Figure 8 As shown, this second embodiment provides a second positioning device for machining circular holes on the inside of sleeve-type parts. Compared to the first embodiment, this embodiment is primarily different in that it is applied to an electric drill 6 that does not have a process hole 10. Based on this scope of use, the vertical positioning assembly in this second embodiment also includes a fixed insert 20, which is fixedly mounted at the rear end of the electric drill 6 and coaxially arranged with the drill bit 21 of the electric drill 6, and is configured to engage with the threaded rod 3. Furthermore, when the end of the threaded rod 3 away from the magnetic base 2 is engaged with the fixed insert 20, the threaded sleeve 5 can abut against the fixed insert 20, and the engagement depth between the threaded rod 3 and the fixed insert 20 is greater than the depth of the drilled hole.

[0036] At this time, when using the second embodiment of the present invention to process the inner circular hole of a metal sleeve-type part, the vertical positioning assembly and the horizontal positioning assembly can be first installed inside the workpiece 1 to be processed, and the magnetic base 2 can be adsorbed on the top of the inner wall of the workpiece 1 to be processed. The threaded rod 3 is coaxially arranged with the hole 19 to be processed, and the workpiece positioning hole 18 on the positioning frame 22 is aligned with the hole 19 to be processed. The end of the threaded rod 3 is then plugged into the fixed insert 20 installed at the rear end of the electric drill 6. At this time, the operator can manually rotate the threaded sleeve 5 and control the threaded sleeve 5 to move downward along the threaded rod 3 through the rotation of the threaded sleeve 5. The threaded sleeve 5 pushes the fixed insert 20 and the electric drill 6 downward, and the electric drill 6 drives the drill bit 21 installed therein to move downward in the workpiece positioning hole 18, and finally achieves a linear drilling action. In order to ensure the drilling effect, the insertion depth of the threaded rod 3 and the fixed insert 20 should be greater than the depth of the drilled hole.

[0037] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A positioning device for machining a circular hole on the inner side of a sleeve-type part, characterized in that: The invention comprises a vertical positioning component and a horizontal positioning component; the vertical positioning component comprises a threaded rod (3), one end of which is fixedly mounted with a magnetic base (2), and the magnetic base (2) can be adsorbed on the inner surface of a workpiece to be processed (1); the other end of the threaded rod (3) is threadedly connected with a threaded sleeve (5), and when the end of the threaded rod (3) away from the magnetic base (2) is inserted into a process hole (10) coaxial with the drill bit (21) at the rear end of an electric drill (6), the threaded sleeve (5) can abut against the outer shell of the electric drill (6); the horizontal positioning component comprises a positioning frame (22), and the positioning frame (22) is provided with a workpiece connecting hole (16) and a workpiece positioning hole (18), and when the workpiece connecting hole (16) is aligned with the processed hole on the workpiece to be processed (1), the workpiece positioning hole (18) is aligned with the hole to be processed (19) of the workpiece to be processed (1).

2. The positioning device for machining a circular hole inside a sleeve-type part according to claim 1, characterized in that: The positioning frame (22) includes an arc plate (8) and a straight plate (7), the sector surface (14) of the arc plate (8) is provided with a workpiece connecting hole (16), the inner arc surface of the arc plate (8) is provided with a fixing slot (15), and the bottom of the fixing slot (15) is provided with a straight plate positioning hole (13); one end of the straight plate (7) is provided with a workpiece positioning hole (18), the other end of the straight plate (7) is located in the fixing slot (15) and is provided with a straight plate connecting hole (17), and the straight plate fastener (9) passes through the straight plate connecting hole (17) and is threadedly connected to the straight plate positioning hole (13).

3. The positioning device for machining a circular hole inside a sleeve-type part according to claim 2, characterized in that: The arc plate (8) is provided with at least two groups of workpiece connection holes (16) along the radial direction.

4. The positioning device for machining a circular hole inside a sleeve-type part according to claim 1, characterized in that: At least one rotating rod (4) is provided on the outside of the threaded sleeve (5).

5. The positioning device for machining a circular hole inside a sleeve-type part according to claim 4, characterized in that: The threaded sleeve (5) includes a slide (11) and a nut (12). The slide (11) is sleeved on the outside of the threaded rod (3), and the nut (12) is threadedly connected to the outside of the threaded rod (3). The lower end of the nut (12) abuts against the upper end of the slide (11), and the outer side of the nut (12) is fixedly connected to the rotating rod (4).

6. The positioning device for machining a circular hole inside a sleeve-like part according to claim 5, characterized in that: The outer diameter of the slide (11) is larger than the diameter of the process hole (10) provided at the rear end of the electric drill (6).

7. A positioning device for machining a circular hole inside a sleeve-type part, characterized in that: The invention comprises a vertical positioning component and a horizontal positioning component; the vertical positioning component comprises a threaded rod (3), one end of which is fixedly mounted with a magnetic base (2), and the magnetic base (2) can be adsorbed on the inner surface of a workpiece to be processed (1); the other end of the threaded rod (3) is threadedly connected with a threaded sleeve (5); the vertical positioning component also comprises a fixed insert (20), the fixed insert (20) is fixedly mounted on the rear end of an electric drill (6) and is coaxially arranged with a drill bit (21) of the electric drill (6), when the end of the threaded rod (3) away from the magnetic base (2) is plugged into the fixed insert (20), the threaded sleeve (5) abuts against the fixed insert (20); the horizontal positioning component comprises a positioning frame (22), the positioning frame (22) is provided with a workpiece connecting hole (16) and a workpiece positioning hole (18), when the workpiece connecting hole (16) is aligned with the processed hole on the workpiece to be processed (1), the workpiece positioning hole (18) is aligned with the hole to be processed (19) of the workpiece to be processed (1).

8. The positioning device for machining a circular hole inside a sleeve-type part according to claim 7, characterized in that: The positioning frame (22) includes an arc plate (8) and a straight plate (7), the sector surface (14) of the arc plate (8) is provided with a workpiece connecting hole (16), the inner arc surface of the arc plate (8) is provided with a fixing slot (15), and the bottom of the fixing slot (15) is provided with a straight plate positioning hole (13); one end of the straight plate (7) is provided with a workpiece positioning hole (18), the other end of the straight plate (7) is located in the fixing slot (15) and is provided with a straight plate connecting hole (17), and the straight plate fastener (9) passes through the straight plate connecting hole (17) and is threadedly connected to the straight plate positioning hole (13).

9. The positioning device for machining a circular hole inside a sleeve-type part according to claim 7, characterized in that: The arc plate (8) is provided with at least two groups of workpiece connection holes (16) along the radial direction.

10. The positioning device for machining a circular hole inside a sleeve-type part according to claim 7, characterized in that: At least one rotating rod (4) is provided on the outside of the threaded sleeve (5).

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