Fixture for axial drilling of cylindrical workpiece

Abstract

The utility model relates to a fixture for axial drilling of a cylindrical workpiece, which comprises a seat body and clamping components, a plurality of clamping stations are arranged on the seat body, and a group of clamping components is arranged on each clamping station; the clamping assembly comprises a collet, a positioning sleeve and a chuck, a vent hole is formed in the clamping station, the positioning sleeve is fixed in the vent hole, a piston cavity externally connected with an air source is formed between the positioning sleeve and the inner wall of the vent hole, the chuck is movably arranged in the piston cavity, a positioning hole is formed in the axis of the positioning sleeve, a shaft hole is formed in the axis of the collet, and the collet is provided with a plurality of clamping jaws along the shaft hole; when a cylindrical workpiece is clamped, the collet chuck is inserted into the positioning hole, the chuck pushes the steel balls to clamp the oblique conical surface of the collet chuck through the groove position, the collet chuck is driven to move towards the positioning hole by a certain distance, and under the limiting of the inner wall of the positioning hole, the multiple clamping jaws move towards the interior of the shaft hole so as to clamp the cylindrical workpiece. According to the utility model, twenty cylindrical workpieces can be clamped at a time, the clamping and debugging time is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of tooling technology for machining and clamping parts, and in particular to a fixture for axial drilling of cylindrical workpieces. Background Technology

[0002] Many hard cylindrical workpieces require axial drilling using milling cutters on machine tools during machining. Traditional horizontal machine tools clamp cylindrical workpieces laterally using indexing heads, while vertical machine tools clamp them vertically. During clamping, the measurement errors caused by clamping vary for each cylindrical workpiece, affecting the machining accuracy and consistency, especially for cylindrical workpieces with a diameter less than 18mm and a short length. Furthermore, each clamping requires independent adjustment, making the process complex and time-consuming. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a fixture for axial drilling of cylindrical workpieces.

[0004] This utility model provides a fixture for axial drilling of cylindrical workpieces, including a base and a clamping assembly. The base has multiple clamping stations, and each clamping station is equipped with a set of clamping assemblies. The clamping assembly includes a collet, a positioning sleeve, and a chuck arranged coaxially from the inside to the outside. Each clamping station has a vent hole, and the positioning sleeve is fixed inside the vent hole. A piston chamber for external air supply is formed between the positioning sleeve and the inner wall of the vent hole. The chuck is movably disposed in the piston chamber by the air pressure of the air source and a locking spring. A positioning hole is provided at the axial center of the positioning sleeve. The collet has a shaft hole at its center for inserting a cylindrical workpiece. Multiple jaws are arranged along the shaft hole. A steel ball that mates with the inclined conical surface of the collet is provided on the positioning sleeve. The chuck has a groove that mates with the steel ball. When clamping a cylindrical workpiece, the collet with the cylindrical workpiece inserted in the shaft hole is inserted into the positioning hole. Under the elastic force of the locking spring, the chuck pushes the steel ball through the groove to clamp the inclined conical surface of the collet, driving the collet to travel a certain distance into the positioning hole. Limited by the inner wall of the positioning hole, the multiple jaws move into the shaft hole to clamp the cylindrical workpiece.

[0005] In some embodiments, the base includes a fixing plate and a base plate. The fixing plate is fixed above the base plate. The fixing plate has multiple vent holes. The base plate has mounting positions at the corresponding vent holes. The mounting positions have first sealing grooves. A first sealing ring connected to the lower end face of the fixing plate is disposed in the first sealing groove. The fixing plate has a material hole concentrically disposed on one side of the vent holes. An inner step is disposed between the material hole and the vent holes. The upper end face of the positioning sleeve abuts against the inner step. The lower end face of the positioning sleeve has a second sealing groove. A second sealing ring in contact with the mounting position of the base plate is disposed in the second sealing groove.

[0006] In some embodiments, the base plate has a chip removal hole at the center of the mounting position, and the lower end face of the base plate is provided with a chip removal groove. The chip removal hole communicates with the chip removal groove and the positioning hole of the positioning sleeve.

[0007] In some embodiments, the mounting position is provided with multiple fixing holes, and a top post is fixed in each fixing hole. The top post is located inside the piston chamber and is positioned towards the chuck. The top post and the locking spring are located on opposite sides of the chuck axial direction, respectively.

[0008] In some embodiments, the outer wall of the chuck is provided with a third sealing groove, and a third sealing ring is provided in the third sealing groove to slide in contact with the inner wall of the vent hole. The chuck shaft is provided with a sliding hole, and the chuck is sleeved on the positioning sleeve through the sliding hole. The groove is provided in the inner wall of the sliding hole, and two fourth sealing grooves are provided on both sides of the groove. A fourth sealing ring is provided in the fourth sealing groove to slide in contact with the outer wall of the positioning sleeve.

[0009] In some embodiments, the chuck is provided with multiple mounting holes at equal angles, and the locking spring is installed in the corresponding mounting holes.

[0010] In some embodiments, the fixing plate has a first air hole on the inner wall of the vent hole, and a plurality of first air holes on the fixing plate are connected to an external air source through a first connector on the outside of the first air passage. The base plate has a second air hole at the mounting position, and a plurality of second air holes on the base plate are connected to an external air source through a second connector on the outside of the second air passage.

[0011] In some embodiments, the positioning sleeve is provided with multiple through holes at equal angles, the through holes penetrating the sidewall of the positioning sleeve, and a steel ball is installed in each through hole.

[0012] In some embodiments, the tapered surface is disposed on the side of the collet away from the jaws, the outer diameter of the end of the collet with the tapered surface is smaller than the inner diameter of the positioning hole, the outer diameter of the end of the collet with the jaws is larger than the inner diameter of the positioning hole, and the outer wall of the jaws is provided with a slope that mates with the inner wall of the positioning hole.

[0013] In some embodiments, the slot is an arc-shaped slot.

[0014] Compared with the prior art, the beneficial effects of this utility model are: by using twenty clamping stations, twenty cylindrical workpieces can be clamped at a time, reducing clamping and debugging time and improving production efficiency. The cylindrical workpieces are vertically clamped on the base, which facilitates the milling cutter of the CNC vertical machining center to drill holes in the cylindrical workpieces in the vertical direction. The chuck of the clamping component clamps and releases the collet under the operation of the locking spring and the air pressure of the external air source. While clamping the collet, the chuck drives the jaws to clamp the cylindrical workpiece, ensuring that the cylindrical workpiece can be stably drilled at the clamping station. Attached Figure Description

[0015] Figure 1 This is one of the three-dimensional structural schematic diagrams of a fixture for axial drilling of cylindrical workpieces according to an embodiment of this application.

[0016] Figure 2 This is the second three-dimensional structural schematic diagram of a fixture for axial drilling of cylindrical workpieces according to an embodiment of this application.

[0017] Figure 3 This is a three-dimensional structural diagram of the fixing plate according to an embodiment of this application.

[0018] Figure 4 This is a three-dimensional structural diagram of the base plate according to an embodiment of this application.

[0019] Figure 5 This is a cross-sectional structural diagram of the clamping station according to an embodiment of this application.

[0020] Figure 6 This is a three-dimensional structural diagram of the clamping component according to an embodiment of this application.

[0021] Figure 7 This is an exploded structural diagram of the clamping component according to an embodiment of this application.

[0022] Reference numerals: 101, clamping station; 102, piston chamber;

[0023] 1. Base body;

[0024] 2. Fixing plate; 21. Vent hole; 22. Material hole; 23. Inner step; 24. First air hole; 25. First air passage; 26. First connector;

[0025] 3. Base plate; 31. Mounting position; 32. First sealing groove; 33. First sealing ring; 34. Chip removal hole; 35. Chip removal groove; 36. Fixing hole; 37. Second air hole; 38. Second air passage; 39. Second connector;

[0026] 4. Clamping components;

[0027] 5. Collet; 51. Shaft hole; 52. Tapered surface; 53. Clamping jaws; 54. Inclined surface; 55. Internal thread;

[0028] 6. Positioning sleeve; 61. Positioning hole; 62. Second sealing groove; 63. Second sealing ring; 64. Through hole; 65. Steel ball;

[0029] 7. Chuck; 71. Groove; 72. Third sealing groove; 73. Third sealing ring; 74. Fourth sealing groove; 75. Fourth sealing ring; 76. Mounting hole;

[0030] 8. Locking spring;

[0031] 9. Top column. Detailed Implementation

[0032] The specific embodiments of this utility model are described with reference to the accompanying drawings.

[0033] refer to Figure 1 The figure shows a three-dimensional structural diagram of a fixture used for axial drilling of cylindrical workpieces. The fixture is used in a CNC vertical machining center and has twenty clamping stations 101 (arranged in a 4*5 pattern). Each clamping station 101 is equipped with a clamping component 4, which allows the fixture to clamp twenty cylindrical workpieces at a time. This enables the CNC vertical machining center to process twenty cylindrical workpieces in a single operation, reducing the number of setup and adjustment operations and improving processing efficiency. The clamping component 4 can select a collet 5 with a corresponding hole diameter according to the outer diameter of the cylindrical workpiece, making it compatible with axial drilling of cylindrical workpieces of different diameters.

[0034] refer to Figures 1 to 7 A fixture for axial drilling of cylindrical workpieces includes a base 1 and a clamping assembly 4. The base 1 has multiple clamping stations 101, each clamping station 101 having a set of clamping assemblies 4. The clamping assembly 4 includes a collet 5, a positioning sleeve 6, and a chuck 7 arranged coaxially from the inside out. Each clamping station 101 has a vent hole 21. The positioning sleeve 6 is fixed within the vent hole 21, forming a piston chamber 102 with an external air source between the positioning sleeve 6 and the inner wall of the vent hole 21. The chuck 7 is movably disposed within the piston chamber 102 by the air pressure from the air source and a locking spring 8. The positioning sleeve 6 has a positioning hole 61 at its axial center, and the collet 5 has a positioning hole 61 at its axial center. A shaft hole 51 is provided for inserting a cylindrical workpiece. A collet 5 is provided with multiple jaws 53 along the shaft hole 51. A positioning sleeve 6 is provided with a steel ball 65 that mates with the inclined conical surface 52 of the collet 5. A chuck 7 is provided with a groove 71 that mates with the steel ball 65. When clamping a cylindrical workpiece, the collet 5, which inserts the cylindrical workpiece into the shaft hole 51, is inserted into the positioning hole 61. Under the elastic force of the locking spring 8, the chuck 7 pushes the steel ball 65 through the groove 71 to clamp the inclined conical surface 52 of the collet 5, driving the collet 5 to move a certain distance into the positioning hole 61. Under the limitation of the inner wall of the positioning hole 61, the multiple jaws 53 move into the shaft hole 51 to clamp the cylindrical workpiece.

[0035] The fixture for axial drilling of cylindrical workpieces according to the embodiments of this application uses twenty clamping stations 101 to clamp twenty cylindrical workpieces at a time, reducing clamping and debugging time and improving production efficiency. The cylindrical workpieces are vertically clamped on the base 1, which facilitates the milling cutter of the CNC vertical machining center to drill the cylindrical workpieces in the vertical direction. The chuck 7 of the clamping assembly 4 clamps and releases the collet 5 under the pneumatic operation of the locking spring 8 and the external air source. While clamping the collet 5, the chuck 7 drives the jaws 53 to clamp the cylindrical workpieces, ensuring that the cylindrical workpieces can be stably drilled at the clamping station 101.

[0036] For ease of assembly, in this embodiment, reference is made to... Figures 3 to 5 The base 1 includes a fixing plate 2 and a base plate 3. The fixing plate 2 is fixed above the base plate 3. The fixing plate 2 has multiple vent holes 21. The base plate 3 has an installation position 31 at the corresponding vent hole 21. The installation position 31 has a first sealing groove 32. The first sealing groove 32 has a first sealing ring 33 that connects to the lower end face of the fixing plate 2. The fixing plate 2 has a material hole 22 concentrically arranged on one side of the vent hole 21. The material hole 22 and the vent hole 21 have an inner step 23. The upper end face of the positioning sleeve 6 abuts against the inner step 23. The lower end face of the positioning sleeve 6 has a second sealing groove 62. The second sealing groove 62 has a second sealing ring 63 that contacts the installation position 31 of the base plate 3.

[0037] Understandably, this configuration divides the base 1 into a fixed plate 2 and a base plate 3. A vent 21 is formed on the fixed plate 2, and the clamping assembly 4 is installed in the vent 21. The fixed plate 2 and the base plate 3 are then fixed together for easy assembly. A first sealing ring 33 is provided between the base plate 3 and the fixed plate 2, and a second sealing ring 63 is provided between the positioning sleeve 6 and the base plate 3 to ensure the airtightness of the vent 21.

[0038] To facilitate the removal of debris during the drilling process, in this embodiment, reference is made to... Figure 4 and Figure 5 The base plate 3 has a chip removal hole 34 at the center of the mounting position 31, and a chip removal groove 35 is provided on the lower end face of the base plate 3. The chip removal hole 34 communicates with the chip removal groove 35 and the positioning hole 61 of the positioning sleeve 6.

[0039] Understandably, with this setup, the cylindrical workpiece is drilled with a milling cutter to create a shaft hole 51, which penetrates the cylindrical workpiece. The chips generated during drilling can fall into the chip removal groove 35 through the shaft hole 51, positioning hole 61, and chip removal hole 34 of the collet 5, thus preventing chips from accumulating inside the fixture.

[0040] To ensure a stable connection between the locking spring 8 and the fixing plate 2 and the chuck 7, in this embodiment, reference is made to... Figure 4 and Figure 5The mounting position 31 is provided with multiple fixing holes 36, and the fixing holes 36 are used to fix the top post 9. The top post 9 is located in the piston chamber 102 and is set towards the chuck 7. The top post 9 and the locking spring 8 are located on both sides of the axial direction of the chuck 7, respectively.

[0041] Understandably, with this setup, the locking spring 8 drives the chuck 7 downwards, the chuck 7 pushes the steel ball 65 to clamp the collet 5, and the chuck 7 will move downwards under the elastic force of the locking spring 8. The chuck 7 is supported by the top post 9 below the chuck 7, preventing the chuck 7 from continuing to move downwards, which would cause the connection between the locking spring 8, the chuck 7, and the fixing plate 2 to become loose, and preventing the locking spring 8 from detaching from the mounting hole 76 of the chuck 7, thus ensuring structural stability.

[0042] In order for the chuck 7 to move under the air pressure of an external air source, in this embodiment, reference is made to... Figures 5 to 7 The outer wall of the chuck 7 is provided with a third sealing groove 72, and a third sealing ring 73 is provided in the third sealing groove 72 to slide in contact with the inner wall of the vent hole 21. The chuck 7 is provided with a sliding hole at its axis, and the chuck 7 is sleeved on the positioning sleeve 6 through the sliding hole. The groove 71 is provided in the inner wall of the sliding hole, and two fourth sealing grooves 74 are provided on both sides of the groove 71 in the inner wall of the sliding hole. A fourth sealing ring 75 is provided in the fourth sealing groove 74 to slide in contact with the outer wall of the positioning sleeve 6.

[0043] Understandably, this configuration, through the fourth sealing ring 75 and the third sealing ring 73 on the inner and outer sides of the chuck 7, separates the upper and lower cavities of the piston chamber 102, ensuring that the chuck 7 can move along the piston chamber 102 under the air pressure of the external air source, just like a piston.

[0044] In order to install the locking spring 8, in this embodiment, refer to Figure 6 The chuck 7 has sixteen mounting holes 76 at equal angles, and the locking spring 8 is installed in the corresponding mounting holes 76.

[0045] Understandably, with this setup, sixteen mounting holes 76 are opened at equal angles on the upper surface of the chuck 7. The mounting holes 76 are blind holes, and the inner diameter of the mounting holes 76 is slightly larger than the outer diameter of the locking springs 8. The locking springs 8 are placed inside the mounting holes 76, and the elastic force of the sixteen locking springs 8 is evenly applied to the chuck 7, ensuring that the chuck 7 can stably push the steel ball 65 to clamp the collet 5.

[0046] In order to supply air to the twenty vents 21, in this embodiment, reference is made to... Figures 1 to 4 The fixing plate 2 has a first air hole 24 on the inner wall of the vent 21. Multiple first air holes 24 on the fixing plate 2 are connected to an external air source through the first connector 26 on the outside of the first air passage 25. The base plate 3 has a second air hole 37 on the mounting position 31. Multiple second air holes 37 on the base plate 3 are connected to an external air source through the second connector 39 on the outside of the second air passage 38.

[0047] Understandably, with this configuration, the first vent 24 supplies air to the upper cavity of the piston chamber 102, the second vent 37 supplies air to the lower cavity of the piston chamber 102, the first vent 24 of the five vent holes 21 in the same row are connected to the first connector 26 through the same first air passage 25, the second vent 37 of the five vent holes 21 in the same row are connected to the second connector 39 through the same second air passage 38, and air is supplied to the twenty vent holes 21 through the four first connectors 26 and the four second connectors 39.

[0048] In order to secure the collet 5, in this embodiment, refer to Figures 5 to 7 The positioning sleeve 6 has multiple through holes 64 at equal angles. The through holes 64 penetrate the side wall of the positioning sleeve 6, and a steel ball 65 is installed in each through hole 64.

[0049] Understandably, with this setup, a steel ball 65 is installed in each of the six through holes 64 set at equal angles on the positioning sleeve 6, so that the slot 71 of the chuck 7 can simultaneously drive the six steel balls 65 to clamp the inclined conical surface 52 of the collet 5, thus clamping the collet 5 tightly in the positioning sleeve 6.

[0050] In order to drive the gripper 53 to clamp the cylindrical workpiece, in this embodiment, refer to Figure 5 The inclined conical surface 52 is located on the side of the collet 5 away from the jaw 53. The outer diameter of the end of the collet 5 with the inclined conical surface 52 is smaller than the inner diameter of the positioning hole 61. The outer diameter of the end of the collet 5 with the jaw 53 is larger than the inner diameter of the positioning hole 61. The outer wall of the jaw 53 is provided with an inclined surface 54 that mates with the inner wall of the positioning hole 61.

[0051] It should be further explained that the inner wall of the shaft hole 51 of the collet 5 is provided with an internal thread 55. The grommets are installed through the internal thread 55. The grommets are screwed into the collet 5 and used as a limit platform. They can be adjusted according to the length of the workpiece. The internal hexagonal groove of the grommets is provided with a waste hole 22 that passes through the grommets to facilitate chip removal.

[0052] Understandably, with this setup, when the steel ball 65 clamps the inclined conical surface 52 of the collet 5, the steel ball 65 will push the collet 5 downwards by a distance less than the diameter of the steel ball 65. During the downward movement of the collet 5, the interaction between the inclined surface 54 of the outer wall of the jaw 53 and the positioning hole 61 will push all six jaws 53 to move synchronously toward the shaft hole 51, thereby clamping the cylindrical workpiece inside the shaft hole 51.

[0053] In order for the chuck 7 to cooperate with the steel ball 65, in this embodiment, reference is made to... Figure 5 and Figure 7 Slot 71 is a circular arc slot.

[0054] Understandably, this configuration allows the arc groove to better match the shape of the steel ball. When the collet 5 needs to be released, the piston chamber 102 is vented, pushing the chuck 7 upward to overcome the elastic force of the locking spring 8. The elastic force of the gripper 53 itself drives the collet 5 upward. The inclined conical surface 52 of the collet 5 pushes the steel ball towards the arc groove. During the upward pulling of the collet 5, the inclined conical surface 52 will push the steel ball into the arc groove.

[0055] In the working process of this embodiment, when drilling twenty cylindrical workpieces in a CNC vertical machining center, the cylindrical workpieces to be processed are placed inside the collet 5 for pre-clamping outside the CNC vertical machining center. After the CNC vertical machining center has finished processing the twenty cylindrical workpieces, the air source is turned on to supply air into the air vent 21, causing the steel ball 65 to release the collet 5. The twenty cylindrical workpieces, together with the collet 5, are pulled out of the fixture. Then, the cylindrical workpieces to be processed, together with the collet 5, are placed into the clamping station 101. After the twenty clamping stations 101 are filled, the air source is turned off. The chuck 7 moves downward under the action of the locking spring 8, pushing the steel ball 65 to clamp the collet 5, generating a downward pulling force on the collet 5. The jaws 53 of the collet 5 retract inward to clamp the cylindrical workpieces, and then drilling is performed, ensuring that the cylindrical workpieces can be stably drilled in the clamping station 101.

[0056] The above does not limit the technical scope of this utility model. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A fixture for axial drilling of cylindrical workpieces, characterized in that, The system includes a base and a clamping assembly. The base has multiple clamping stations, and each clamping station has a set of clamping assemblies. Each clamping assembly includes a collet, a positioning sleeve, and a chuck arranged coaxially from the inside out. Each clamping station has a vent hole. The positioning sleeve is fixed within the vent hole, and a piston chamber for external air supply is formed between the positioning sleeve and the inner wall of the vent hole. The chuck is movably positioned within the piston chamber by the air pressure from the air source and a locking spring. A positioning hole is provided at the axis of the positioning sleeve, and an insertion hole is provided at the axis of the collet. The cylindrical workpiece has a shaft hole. The collet is provided with multiple jaws along the shaft hole. The positioning sleeve is provided with steel balls that mate with the inclined conical surface of the collet. The chuck is provided with slots that mate with the steel balls. When clamping the cylindrical workpiece, the collet with the cylindrical workpiece inserted in the shaft hole is inserted into the positioning hole. Under the elastic force of the locking spring, the chuck pushes the steel balls through the slots to clamp the inclined conical surface of the collet, driving the collet to move a certain distance into the positioning hole. Under the limit of the inner wall of the positioning hole, the multiple jaws move into the shaft hole to clamp the cylindrical workpiece.

2. The fixture for axial drilling of cylindrical workpieces according to claim 1, characterized in that, The base includes a fixing plate and a base plate. The fixing plate is fixed above the base plate. The fixing plate has multiple vent holes. The base plate has mounting positions at the corresponding vent holes. The mounting positions have first sealing grooves. A first sealing ring connected to the lower end face of the fixing plate is disposed in the first sealing groove. The fixing plate has a material hole concentrically disposed on one side of the vent holes. An inner step is disposed between the material hole and the vent holes. The upper end face of the positioning sleeve abuts against the inner step. The lower end face of the positioning sleeve has a second sealing groove. A second sealing ring in contact with the mounting position of the base plate is disposed in the second sealing groove.

3. The fixture for axial drilling of cylindrical workpieces according to claim 2, characterized in that, The base plate has a chip removal hole at the center of the mounting position, and a chip removal groove is provided on the lower end face of the base plate. The chip removal hole communicates with the chip removal groove and the positioning hole of the positioning sleeve.

4. The fixture for axial drilling of cylindrical workpieces according to claim 2, characterized in that, The mounting position is provided with multiple fixing holes, and a top post is fixed in each fixing hole. The top post is located inside the piston chamber and is positioned towards the chuck. The top post and the locking spring are located on opposite sides of the chuck's axial direction, respectively.

5. The fixture for axial drilling of cylindrical workpieces according to claim 4, characterized in that, The outer wall of the chuck is provided with a third sealing groove, and a third sealing ring is provided in the third sealing groove to slide in contact with the inner wall of the vent hole. The chuck shaft is provided with a sliding hole, and the chuck is sleeved on the positioning sleeve through the sliding hole. The groove is provided in the inner wall of the sliding hole, and two fourth sealing grooves are provided on both sides of the groove. A fourth sealing ring is provided in the fourth sealing groove to slide in contact with the outer wall of the positioning sleeve.

6. The fixture for axial drilling of cylindrical workpieces according to claim 4, characterized in that, The chuck has multiple mounting holes at equal angles, and the locking spring is installed in the corresponding mounting holes.

7. The fixture for axial drilling of cylindrical workpieces according to claim 2, characterized in that, The fixing plate has a first air hole on the inner wall of the vent hole. Multiple first air holes on the fixing plate are connected to an external air source through a first connector on the outside of the first air passage. The base plate has a second air hole at the installation position. Multiple second air holes on the base plate are connected to an external air source through a second connector on the outside of the second air passage.

8. The fixture for axial drilling of cylindrical workpieces according to claim 1, characterized in that, The positioning sleeve has multiple through holes at equal angles, and each through hole penetrates the side wall of the positioning sleeve. A steel ball is installed in each through hole.

9. The fixture for axial drilling of cylindrical workpieces according to claim 1, characterized in that, The inclined conical surface is disposed on the side of the collet away from the jaws. The outer diameter of the end of the collet with the inclined conical surface is smaller than the inner diameter of the positioning hole. The outer diameter of the end of the collet with the jaws is larger than the inner diameter of the positioning hole. The outer wall of the jaws is provided with an inclined surface that mates with the inner wall of the positioning hole.

10. The fixture for axial drilling of cylindrical workpieces according to claim 1, characterized in that, The slot is a circular arc slot.

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