Centering chuck and mounting method

Abstract

The application discloses a centering chuck and a mounting method, comprising a main body, two ends of which are a first end and a second end respectively, the first end is used for connecting a machine tool, the second end is provided with a first cavity coaxial with the main body, and a plurality of mounting holes are uniformly arranged on the circumferential side wall of the second end, a clamping bolt along the radial direction of the first cavity is arranged in the mounting hole, and one end of the clamping bolt extends into the first cavity and is used for clamping a workpiece; after the clamping bolt is mounted, the distance from the end of the clamping bolt in the first cavity to the axis of the first cavity is Li, therefore, the mounted clamping bolt is required to be calculated by a formula to be greater than a first set value L6, so that the mutual action of the plurality of clamping bolts after mounting can ensure the accurate centering of the workpiece and the clamping accuracy of the workpiece.

Description

Technical Field

[0001] This disclosure relates to the field of clamping and centering tools, specifically to a centering chuck and its installation method. Background Technology

[0002] A chuck is a workpiece clamping device widely used in machining. It securely fixes a workpiece or tool by applying clamping pressure inside or outside the object's diameter. Chucks are commonly used in machine tools such as lathes to clamp and fix workpieces or tools, such as drills and milling cutters. The design and use of chucks are crucial for ensuring machining accuracy and improving production efficiency.

[0003] Traditional chuck designs have some limitations. For example, some chucks, such as three-jaw chucks, have a centering function, but the consistency of their positioning accuracy is difficult to meet the requirements for clamping precision workpieces. Furthermore, when workpieces need to be inspected offline, the repeatability of the three-jaw chuck is difficult to guarantee. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a centering chuck and an installation method.

[0005] Firstly, this application provides a centering chuck, comprising:

[0006] The main body has a first end and a second end at its two ends. The first end is used to connect to a machine tool, and the second end has a first cavity coaxial with the main body for accommodating a workpiece. The diameter of the first cavity at the end closer to the first end is smaller than the diameter at the end closer to the second end.

[0007] The second end circumferential sidewall is uniformly provided with a plurality of clamping bolts extending radially along the first cavity. The clamping bolts have a bolt head, a threaded section, a first extension section and a second extension section in sequence along their length direction. The end of the second extension section away from the bolt head extends into the first cavity for clamping the workpiece.

[0008] According to the technical solution provided in the embodiments of this application, a mounting hole is provided on the second end circumferential sidewall corresponding to the clamping bolt. The mounting hole includes a countersunk hole, a threaded cavity, and a clamping cavity that are connected in sequence. The countersunk hole is used to accommodate the bolt head. The threaded cavity is screwed to the threaded section. The clamping cavity is interference-fitted with the first extension section and clearance-fitted with the second extension section.

[0009] According to the technical solution provided in the embodiments of this application, a first empty section is provided between the bolt head and the threaded section, and a second empty section is provided between the threaded section and the first extension section;

[0010] A first empty cavity is provided between the countersunk hole and the threaded cavity, and a second empty cavity is provided between the threaded cavity and the clamping cavity.

[0011] According to the technical solution provided in the embodiments of this application, the first end is provided with a second cavity coaxial with the main body, and a plurality of connecting bolts parallel to the axis of the main body are uniformly arranged circumferentially on the end face of the first end for connecting with the machine tool;

[0012] The main body includes a first connecting segment, a second connecting segment, and a third connecting segment coaxially connected in sequence from a first end to a second end. The diameter of the end of the first connecting segment and the second connecting segment closer to the first connecting segment is larger than the diameter of the end closer to the third connecting segment, which is used to indicate the installation direction of the main body.

[0013] According to the technical solution provided in the embodiments of this application, the diameter of the second empty cavity is D6, the diameter of the threaded cavity is M2, the diameter of the threaded section is M3, the diameter of the first extension section is D10, and the diameter of the second extension section is D9, satisfying the following:

[0014] D6>D10>D7>D9;

[0015] M2 = M3;

[0016] This allows the first insertion section to have an interference fit with the clamping cavity, and the second empty blade to avoid the first and second insertion sections.

[0017] According to the technical solution provided in the embodiments of this application, the sum of the lengths of the first empty section, the threaded section, the second empty section, and the first extended section is L14; the sum of the lengths of the first empty section and the threaded section is L13; the sum of the lengths of the first empty cavity and the threaded cavity is L9; the length of the clamping bolt is L11; the length of the bolt head is L12; and the sum of the lengths of the first empty cavity, the threaded cavity, and the second empty cavity is L8, satisfying the following:

[0018] L14>L9>L13;

[0019] (L11-L12-L14)>L8;

[0020] The threaded cavity provides space for the threaded segment to be screwed in, ensuring that the end of the second extension segment away from the bolt head can protrude from the inner wall of the first cavity, and ensuring that the first extension segment does not come into contact with the locking cavity before the threaded cavity and the threaded segment are screwed together.

[0021] According to the technical solution provided in the embodiments of this application, the distance from the end of the first empty cavity near the countersunk hole to the axis of the first cavity body is L7, the diameter of the countersunk hole is D4, and the diameter of the bolt head is D11, satisfying the following:

[0022] (D8 / 2-L7)>L12;

[0023] D4>D11;

[0024] This allows the countersunk hole to fully accommodate the bolt head.

[0025] Secondly, this application provides an installation method that utilizes the aforementioned centering chuck, comprising:

[0026] The diameter of the end of the first cavity near the second end is D8, and the taper of the first cavity is V.

[0027] The diameter of the clamping cavity is D7;

[0028] The distance from the end of the second extension section away from the bolt head to the axis of the first cavity is a first set value L6, and the distance from the axis of the clamping bolt to the second end face is a second set value L4.

[0029] After the retaining bolt is inserted into the mounting hole, the distance from the end of the second extension section away from the bolt head to the axis of the first cavity is set to Li, which must satisfy:

[0030] Li=[D8 / 2-(L4+D7 / 2)*TAN(V / 2)]>L6;

[0031] Thus, after the clamping bolt is inserted into the mounting hole, the end of the second extension section away from the bolt head can extend into the first cavity, protruding from the inner wall of the first cavity to ensure the clamping accuracy of the workpiece.

[0032] In summary, this technical solution discloses a centering chuck and its installation method, comprising a main body with a first end and a second end at its two ends. The first end is used to connect to a machine tool, and the second end has a first cavity coaxial with the main body for accommodating a workpiece. The circumferential sidewall of the second end is evenly provided with a plurality of mounting holes for installing clamping bolts. The clamping bolts extend radially along the length direction of the first cavity and sequentially include a bolt head, a threaded section, a first insertion section, and a second penetration section. The end of the second insertion section away from the bolt head extends into the first cavity and centers and clamps the workpiece.

[0033] Select the closest distance L6 from the end of the second extension segment away from the bolt head to the axis of the first cavity, and the farthest distance from the axis of the clamping bolt to the second end face. Set the distance from the end of the second extension segment away from the bolt head to the axis of the first cavity after the clamping bolt is installed as Li, so that Li satisfies the formula and is greater than L6. This allows the three clamping bolts to work together to achieve precise centering of the workpiece. Attached Figure Description

[0034] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0035] Figure 1 This is a schematic diagram of the centering chuck structure.

[0036] Figure 2 This is a side view of the centering chuck.

[0037] Figure 3 This is a cross-sectional view of the centering chuck.

[0038] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0039] Figure 5 A cross-sectional view of the centering chuck after the clamping bolts have been installed.

[0040] Figure 6 This is a schematic diagram of the clamping bolt structure.

[0041] Figure 7 This is a side view of the clamping bolt.

[0042] Figure 8 This is a schematic diagram of a polygonal countersunk hole.

[0043] The following are the labeling elements in the diagram: 1. Main body; 2. First cavity; 3. Clamping bolt; 4. Bolt head; 5. Threaded section; 6. First extension section; 7. Second extension section; 8. Mounting hole; 9. Countersunk hole; 10. Threaded cavity; 11. Clamping cavity; 12. First empty section; 13. Second empty section; 14. First empty cavity; 15. Second empty cavity; 16. Second cavity; 17. Connecting bolt; 18. First connecting section; 19. Second connecting section; 20. Third connecting section; 21. Polygonal countersunk hole. Detailed Implementation

[0044] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] Example 1

[0047] Please refer to Figure 1A centering chuck includes a main body 1 with a first end and a second end at its two ends. The first end is used to connect to a machine tool, and the second end is used to hold a workpiece. The main body 1 includes a first connecting section 18, a second connecting section 19, and a third connecting section 20 that are coaxially fixedly connected along the direction from the first end to the second end. The diameter of the first connecting section 18 is larger than the diameter of the third connecting section 20. The diameter of the end of the second connecting section 19 closest to the first connecting section 18 is larger than the diameter of the end of the second connecting section 19 closest to the first connecting section 18. Thus, the second connecting section 19 is frustum-shaped and its function is to mark the installation direction of the main body 1 to avoid reverse installation.

[0048] The first end has a second cavity 16 coaxial with the main body 1. Optionally, it is a cylindrical cavity, and multiple connecting bolts 17 are evenly arranged circumferentially on the end face of the first end. The axis of the connecting bolts 17 is parallel to the axis of the main body 1 and is used to connect with the interface flange of the machine tool. Optionally, the connecting bolts 17 pass through the second end along the axis of the main body 1 to the first end and extend away from the first end.

[0049] The second end has a first cavity 2 coaxial with the main body 1. Optionally, it is a frustum-shaped cavity, and the first cavity 2 and the second cavity 16 are connected. The diameter of the end of the first cavity 2 near the second cavity 16 is smaller than the diameter of the end near the second end.

[0050] The third connecting section 20 has three mounting holes 8 evenly distributed on its circumferential sidewall. The axis of the mounting holes 8 extends radially along the main body 1, and the end of the mounting holes 8 away from the third connecting section 20 is connected to the first cavity 2. The mounting holes 8 are equipped with clamping bolts 3 for clamping and centering the workpiece.

[0051] The clamping bolt 3 includes a bolt head 4, a threaded section 5, a first extension section 6 and a second extension section 7 that are fixedly connected in sequence along its length. The diameter of the threaded section 5 is larger than the diameter of the first extension section 6, and the diameter of the first extension section 6 is larger than the diameter of the second extension section 7. A first hollow section 12 is provided between the bolt head 4 and the threaded section 5, and a second hollow section 13 is provided between the threaded section 5 and the first extension section 6.

[0052] The mounting hole 8 includes a countersunk hole 9, a threaded cavity 10 and a clamping cavity 11 connected in sequence along its length. A first empty cavity 14 is provided between the countersunk hole 9 and the threaded cavity 10, and a second empty cavity 15 is provided between the threaded cavity 10 and the clamping cavity 11.

[0053] The diameter of the first empty cavity 14 is greater than the diameter of the threaded cavity 10, the diameter of the threaded cavity 10 is greater than the diameter of the second empty cavity 15, and the diameter of the second empty cavity 15 is greater than the diameter of the clamping cavity 11.

[0054] The countersunk hole 9 is used to accommodate the bolt head 4. The threaded section 5 and the threaded cavity 10 are adapted to each other and are threadedly connected. The clamping cavity 11 is used to accommodate the first extension section 6 and the second extension section 7. The diameter of the clamping cavity 11 is larger than the diameter of the second extension section 7 and smaller than the diameter of the first extension section 6. Therefore, the clamping cavity 11 and the first extension section 6 are interference fit, and the second extension section 7 is clearance fit.

[0055] Therefore, after the clamping bolt is installed, the threaded connection between the threaded cavity 10 and the threaded section 5, and the interference fit between the clamping cavity 11 and the first extension section 6, enable the clamping bolt 3 to be stably installed in the mounting hole 8, ensuring the stability of the clamping bolt 3 during operation. The interference fit between the clamping cavity 11 and the first extension section 6 can prevent the clamping bolt from loosening due to vibration during operation, increasing safety and ensuring reliability.

[0056] When the retaining bolt is installed, the first empty cavity 14 is used to avoid the threaded section 5, and the second empty cavity 15 is used to avoid the first extension section 6 and the second extension section 7.

[0057] Example 2

[0058] An installation method is applied to a centering chuck proposed in Embodiment 1. The taper of the first cavity 2 is V, and the diameter of the end of the first cavity 2 near the second end is D8. The maximum axial distance between the axis of the clamping bolt 3 and the end face of the second end is set to a second set value L4. The closest distance between the end of the second extension section 7 away from the bolt head 4 and the axis of the first cavity 2 is set to a first set value L6. The diameter of the clamping cavity 11 is D7. After the clamping bolt 3 is installed, the distance from the end of the second extension section 7 of the clamping bolt 3 away from the bolt head 4 to the axis of the first cavity 2 is set to Li, which must satisfy:

[0059] Li=[D8 / 2-(L4+D7 / 2)*TAN(V / 2)]>L6;

[0060] Thus, after the clamping bolt 3 is inserted into the mounting hole 8, the end of the second extension section 7 away from the bolt head 4 can extend into the first cavity 2 and protrude from the inner wall of the first cavity 2. The clamping accuracy of the workpiece can be ensured by the three circumferential clamping bolts 3.

[0061] The diameter of the threaded cavity 10 is M2, and the diameter of the threaded section 5 is M3. Since M2 = M3, the threaded cavity 10 and the threaded section 5 are compatible and can be threaded together.

[0062] The diameter of the first empty cavity 14 is D5, where D5>M2. Thus, when the clamping bolt 3 is installed, the first empty cavity 14 can avoid the threaded section 5 while ensuring that the threaded section 5 is screwed into the end of the threaded cavity 10.

[0063] The diameter of the second hollow cavity 15 is D6, the diameter of the first extension section 6 is D10, and the diameter of the second extension section 7 is D9, with D6>D10>D7>D9;

[0064] Where D7>D9, the diameter of the clamping cavity 11 is greater than that of the second extension section 7, thus the clamping cavity 11 and the second extension section 7 are fitted with a clearance.

[0065] D10>D7, the diameter of the first insertion section 6 is greater than the diameter of the clamping cavity 11, thus the clamping cavity 11 and the first insertion section 6 are interference fit;

[0066] D6>D10, when the retaining bolt 3 is installed, the second empty blade chamber 15 can avoid the first extension section 6;

[0067] Therefore, after the clamping bolt 3 is installed, the threaded cavity 10 and the threaded section 5 are connected by threads, and the clamping cavity 11 and the first extension section 6 are interference-fitted, which can ensure the tightness of the clamping bolt 3, prevent the clamping bolt 3 from loosening due to vibration during operation, ensure the stability of the clamping bolt 3, and improve safety and reliability.

[0068] The sum of the lengths of the first empty section 12, the threaded section 5, the second empty section 13, and the first extending section 6 is L14; the sum of the lengths of the first empty section 12 and the threaded section 5 is L13; the sum of the lengths of the first empty cavity 14 and the threaded cavity 10 is L9; the length of the retaining bolt 3 is L11; the length of the bolt head 4 is L12; and the sum of the lengths of the first empty cavity 14, the threaded cavity 10, and the second empty cavity 15 is L8. Wherein:

[0069] L14>L9>L13;

[0070] (L11-L12-L14)>L8;

[0071] Therefore, the length of the threaded cavity 10 is greater than the length of the threaded segment 5. The threaded cavity 10 can provide more screwing space for the threaded segment 5 and can ensure that the first extension segment 6 does not come into contact with the clamping cavity 11 before the threaded cavity 10 and the threaded segment 5 come into contact. This ensures that the interference fit between the clamping cavity 11 and the first extension segment 6 is driven entirely by the screw connection between the threaded cavity 10 and the threaded segment 5. That is, when installing the clamping bolt 3, the interference fit between the clamping cavity 11 and the first extension segment 6 is achieved by the force of the threaded connection between the threaded cavity 10 and the threaded segment 5. When releasing the clamping bolt 3, the force of the threaded connection between the threaded cavity 10 and the threaded segment 5 is also required to release the interference fit between the clamping cavity 11 and the first extension segment 6. This can prevent the clamping bolt 3 from getting stuck and prevent the clamping bolt 3 from being unable to be removed, making installation and removal convenient. At the same time, it can also ensure that the second extension segment 7 has sufficient length to extend into the interior of the first cavity 2 and protrude from the inner wall of the first cavity 2.

[0072] The distance from the end of the first empty cavity 14 near the countersunk hole 9 to the axis of the first cavity 2 is L7. The diameter of the countersunk hole 9 is D4, and the diameter of the bolt head 4 is D11. Where (D8 / 2-L7)>L12, D4>D11, this ensures that after the clamping bolt 3 is installed, the countersunk hole 9 can fully accommodate the bolt head 4, and prevents the bolt head 4 from protruding from the circumferential sidewall of the main body 1.

[0073] A polygonal countersunk hole 21 is provided on the end of the bolt head 4 away from the second extension section 7. Optionally, it is a regular hexagonal countersunk hole. The purpose is to facilitate the tightening of the clamping bolt 3. The diameter of the inscribed circle of the polygonal countersunk hole 21 is S. Then, D11 / 2≥S≥D11 / 3.

[0074] The diameter of the first connecting segment 18 is D1, and the diameter of the third connecting segment 20 is D2, where D1 > D2;

[0075] The axial length of the main body 1 is L2, the axial length of the first cavity 2 is L3, and L2 / 2≥L3≥L2 / 3;

[0076] The second set value L4 satisfies L3 / 2≥L4≥L3 / 3;

[0077] The diameter of the second cavity 16 is D3.

[0078] The diameter of the connecting bolt 17 is M1, and the distance from the end of the connecting bolt 17 away from the main body 1 to the first end face is L5. When the main body 1 is installed on the interface flange of the machine tool, the connecting bolt 17 in the locked state must satisfy L5≥M1*2 to ensure a tight connection.

[0079] The first connecting section 18, the second connecting section 19 and the third connecting section 20 on the main body 1 must be coaxial. After installation, the interface flange of the main body 1 and the machine tool must be coaxial, and the main body 1 must be coaxial with the workpiece. The coaxiality range is between 0-0.02mm. In this embodiment, the coaxiality is required to be less than 0.005mm.

[0080] Working principle: The connecting bolt 17 on the first end face of the main body 1 is used to connect to the interface flange of the machine tool. The clamping bolt 3 on the second end of the main body 1 is used to extend into the first cavity 2 to center and clamp the workpiece. The three clamping bolts arranged in the circumferential direction can ensure the centering operation of the workpiece. The closest distance from the end of the second extension section 7 away from the bolt head 4 to the axis of the first cavity 2 is taken as the first set value L6. The distance from the end of the second extension section 7 away from the bolt head 4 to the axis of the first cavity 2 is set as Li. After the clamping bolt 3 is installed, if Li>L6 is ensured, the three clamping bolts 3 can accurately center the workpiece and ensure the centering accuracy of the clamping bolt 3.

[0081] At the same time, the length and size of each component are standardized to ensure that the device meets structural requirements and can guarantee the accuracy of installation;

[0082] The threaded fit between the threaded section 5 and the threaded cavity 10, and the interference fit between the clamping cavity 11 and the first extension section 6, ensure the tightness and stability of the clamping bolt 3 during installation, preventing it from loosening due to vibration during operation, thus improving safety. Furthermore, the interference fit and release of the clamping cavity 11 and the first extension section 6 are both achieved through the threaded fit between the threaded section 5 and the threaded cavity 10, preventing the clamping bolt 3 from remaining stuck in the clamping cavity 11 after the threaded section 5 is completely unscrewed from the threaded cavity 10, making disassembly and assembly convenient.

[0083] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A centering chuck, characterized in that, include: The main body (1) has a first end and a second end at its two ends. The first end is used to connect to a machine tool, and the second end has a first cavity (2) coaxial with the main body (1) for accommodating a workpiece. The diameter of the end of the first cavity (2) near the first end is smaller than the diameter of the end near the second end. The second end circumferential sidewall is uniformly provided with a plurality of clamping bolts (3) extending radially along the first cavity (2). The clamping bolts (3) have a bolt head (4), a threaded section (5), a first insertion section (6), and a second insertion section (7) in sequence along their length direction. The end of the second insertion section (7) away from the bolt head (4) extends into the first cavity (2) for clamping the workpiece. The diameter of the threaded section (5) is larger than the diameter of the first insertion section (6), and the diameter of the first insertion section (6) is larger than the diameter of the second insertion section (7). The second end circumferential sidewall is provided with a mounting hole (8) corresponding to the clamping bolt (3). The mounting hole (8) includes a countersunk hole (9), a threaded cavity (10) and a clamping cavity (11) connected in sequence. The countersunk hole (9) is used to accommodate the bolt head (4). The threaded cavity (10) is screwed to the threaded section (5). The clamping cavity (11) is used to accommodate the first extension section (6) and the second extension section (7). The diameter of the clamping cavity (11) is larger than the diameter of the second extension section (7) and smaller than the diameter of the first extension section (6). The clamping cavity (11) is interference-fitted with the first extension section (6) and clearance-fitted with the second extension section (7). The length of the threaded cavity (10) is greater than the length of the threaded segment (5), which ensures that the first extension segment (6) does not come into contact with the clamping cavity (11) before the threaded cavity (10) and the threaded segment (5) come into contact. When installing and removing the clamping bolt (3), the force of the threaded connection between the threaded cavity (10) and the threaded segment (5) is used to realize and release the interference fit between the clamping cavity (11) and the first extension segment (6).

2. A centering chuck according to claim 1, characterized in that, A first empty section (12) is provided between the bolt head (4) and the threaded section (5), and a second empty section (13) is provided between the threaded section (5) and the first extension section (6). A first empty cavity (14) is provided between the countersunk hole (9) and the threaded cavity (10), and a second empty cavity (15) is provided between the threaded cavity (10) and the clamping cavity (11).

3. A centering chuck according to claim 2, characterized in that, The first end has a second cavity (16) coaxial with the main body (1), and the end face of the first end is uniformly provided with a plurality of connecting bolts (17) parallel to the axis of the main body (1) for connecting with the machine tool. The main body (1) includes a first connecting segment (18), a second connecting segment (19) and a third connecting segment (20) connected coaxially from the first end to the second end. The diameter of the end of the second connecting segment (19) closer to the first connecting segment (18) is larger than the diameter of the end closer to the third connecting segment (20), which is used to identify the installation direction of the main body (1).

4. A centering chuck according to claim 3, characterized in that, The diameter of the second empty cavity (15) is D6, the diameter of the threaded cavity (10) is M2, the diameter of the threaded section (5) is M3, the diameter of the first insertion section (6) is D10, the diameter of the clamping cavity (11) is D7, and the diameter of the second insertion section (7) is D9, satisfying the following: D6>D10>D7>D9; M2=M3; This allows the first insertion section (6) to be interference-fitted with the clamping cavity (11), and the second empty cavity (13) to avoid the first insertion section (6) and the second insertion section (7).

5. A centering chuck according to claim 4, characterized in that, The sum of the lengths of the first empty section (12), the threaded section (5), the second empty section (13), and the first inserted section (6) is L14; the sum of the lengths of the first empty section (12) and the threaded section (5) is L13; the sum of the lengths of the first empty cavity (14) and the threaded cavity (10) is L9; the length of the clamping bolt (3) is L11; the length of the bolt head (4) is L12; and the sum of the lengths of the first empty cavity (14), the threaded cavity (10), and the second empty cavity (15) is L8, satisfying the following: L14>L9>L13; (L11-L12-L14)>L8; The threaded cavity (10) can provide screwing space for the threaded section (5), ensuring that the end of the second extension section (7) away from the bolt head (4) can protrude from the inner wall of the first cavity (2), and ensuring that the first extension section (6) does not come into contact with the clamping cavity (11) before the threaded cavity (10) and the threaded section (5) are screwed together.

6. A centering chuck according to claim 5, characterized in that, The countersunk hole (9) can fully accommodate the bolt head (4).

7. An installation method applied to a centering chuck as described in any one of claims 1-6, characterized in that, include: The clamping bolt (3) is radially inserted into the mounting hole (8) along the first cavity (2) so that the distance Li from the end of the second extension section (7) away from the bolt head (4) to the axis of the first cavity (2) is greater than L6; where Li = [D8 / 2 - (L4 + D7 / 2) * TAN(V / 2)], the diameter of the end of the first cavity (2) near the second end is D8, the taper of the first cavity (2) is V; the diameter of the clamping cavity (11) is D7; the distance from the axis of the clamping bolt (3) to the end face of the second end is the second set value L4; the minimum distance from the end of the second extension section (7) away from the bolt head (4) to the axis of the first cavity (2) is the first set value L6; The end of the second extension section (7) away from the bolt head (4) can extend into the first cavity (2) and protrude from the inner wall of the first cavity (2) to ensure the clamping accuracy of the workpiece.

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