Machining center milling tool

Abstract

The utility model relates to the field of machining and discloses a machining center milling tool which comprises a base, a cone body installed on the base, an air cylinder installed on the base and coaxially distributed with the cone body, and an expansion sleeve with an inner ring arranged in the tail end of one end, and one end of a piston of the air cylinder movably penetrates into the cone body in the axial direction. One end of a piston of the air cylinder is connected to the pull rod, the cone is provided with a cone-shaped cone end, one end, away from the air cylinder, of the pull rod is provided with a positioning portion used for positioning the expansion sleeve, and the positioning portion is provided with a guide structure enabling the expansion sleeve to slide to the positioning portion in the axial direction. By means of the guide structure on the positioning part, when the expansion sleeve is installed on the pull rod, the expansion sleeve only needs to be pushed towards one side of the positioning part in the axial direction, when the expansion sleeve passes through the guide structure, the guide structure enables one side of the inner ring of the expansion sleeve to be stressed and opened through guiding till the inner ring is clamped into the positioning part, and the whole expansion sleeve does not need to be manually pulled in the opening process; the installation difficulty of the expansion sleeve is greatly reduced, and the assembly efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of mechanical processing, in particular to a milling tool for a machining center. Background Art

[0002] The machining center is developed from the CNC milling machine. It is a high-efficiency automated machine tool composed of mechanical equipment and CNC system used to process complex parts. Therefore, it is one of the CNC machine tools with the highest output and the widest application. The milling fixture is a structure used to fix the workpiece in the machining center so that the machining center can perform milling processing on the workpiece, that is, milling out a notch or a tenon on the workpiece.

[0003] The existing milling tooling is to make the cylinder squeeze into the expansion sleeve toward one side of the vertebral body through the cooperation between the expansion sleeve, the vertebral body and the cylinder, so that the expansion sleeve is pressed tightly between the vertebral body and the workpiece to fix the workpiece, so as to ensure the milling process. In order to facilitate the cooperation between the cylinder and the expansion sleeve, a pull rod is coaxially connected to the end of the cylinder, and a circle of grooves is concavely provided on the pull rod along the circumferential direction. Both sides of the grooves are convex from the grooves, and the end of the expansion sleeve has an inner ring protruding inward. When the inner ring is inserted into the groove, the entire expansion sleeve is directly positioned on the pull rod, and the cylinder can directly drive the expansion sleeve to move so that the expansion sleeve can be clamped between the workpiece and the vertebral body through the tension of the cylinder contraction. Although the two ends of the expansion sleeve can be opened or closed, it is still necessary to manually pull the end of the expansion sleeve outward to open it so that the convex inner ring can be inserted into the groove. Manual pulling is relatively laborious and installation is relatively difficult. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is: to provide a milling tool for a machining center to solve the problem of difficulty in manual installation between an expansion sleeve and a pull rod.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a machining center milling tool including a base, a vertebral body installed on the base, a cylinder installed on the base and coaxially distributed with the vertebral body, and an expansion sleeve with an inner ring at one end, one end of the piston of the cylinder is movable into the vertebral body along the axial direction, and a pull rod is connected to one end of the piston of the cylinder and is movable out of the vertebral body toward the side away from the cylinder. The vertebral body has a conical end, and the pull rod has a positioning part for positioning the expansion sleeve on the end away from the cylinder. The positioning part has a guide structure for making the expansion sleeve slide along the axial direction to the positioning part. By sliding and extruding, there is no need to manually turn the expansion sleeve. The expansion sleeve only needs to be pushed along the axial direction to be installed by cooperating with the guide structure, thereby reducing the difficulty of installation.

[0006] Furthermore, the connection between the vertebral body and the conical end extends radially outward relative to the outer periphery of the vertebral body to form a circular abutment surface, so that the workpiece abuts against the abutment surface and cooperates with the expansion sleeve to limit the workpiece in the axial direction.

[0007] Furthermore, the pull rod has a connecting end connected to one end of the cylinder piston and movably inserted into the vertebral body and a mating end always located outside the vertebral body on a side away from the cylinder, and the positioning portion is integrally formed on the mating end; the positioning portion includes an inner retaining ring arranged in a ring shape around the outer periphery of the pull rod and an outer retaining ring arranged in a ring shape around the outer periphery of the pull rod, the inner retaining ring is located on the side facing the cylinder relative to the outer retaining ring, and an annular groove is formed between the inner retaining ring and the outer retaining ring for the inner ring to be clamped therein, and the guide structure is formed on the inner retaining ring to facilitate the installation by extrusion and sliding fit between the expansion sleeve and the inner retaining ring.

[0008] Furthermore, the outer diameter of the inner retaining ring is less than or equal to the inner diameter of the expansion sleeve on the side close to the inner ring, so that when the inner ring is inserted into the annular groove, it is convenient for the expansion sleeve to pass through the inner retaining ring.

[0009] Furthermore, the guide structure includes a first guide bevel formed along the circumferential direction on the side of the inner retaining ring close to the cylinder and a second guide bevel formed at the position of the inner ring corresponding to the first guide bevel, so that the first guide bevel and the second guide bevel can slide with each other, so that the expansion sleeve moves along the axial direction so that the inner ring is stuck in the annular groove, greatly reducing the difficulty of installation between the expansion sleeve and the pull rod.

[0010] Furthermore, a convex bump is formed on one side of the outer buckle ring close to the cylinder in the axial direction toward the cylinder side to form a convex bump for pressing against the inner ring, so as to improve the connection firmness and stability between the expansion sleeve and the pull rod.

[0011] Furthermore, the supporting surface is provided with an elastic clamping portion protruding along the axial direction, and the elastic clamping portion is used to be clamped in a clamping groove formed on the workpiece to limit the freedom of the workpiece in the radial direction and the axial direction toward one side of the cylinder, so as to prevent the expansion sleeve from moving during the extrusion process of the workpiece and increase the difficulty of positioning the expansion sleeve.

[0012] Furthermore, the elastic clamping part has a spring sheet for elastically pressing against the inner wall of the clamping groove, so that after the workpiece is initially in place, the elastic clamping part is clamped in the clamping groove of the workpiece, which can avoid the trouble of manually supporting the workpiece and reduce the difficulty of assembly.

[0013] Furthermore, the elastic clamping part has a third guiding slope on the side away from the cylinder, whose width is smaller than the width of the clamping slot. The third guiding slope extends to one side of the spring sheet and is flush with the spring sheet, so that the elastic clamping part can be quickly inserted into the clamping slot.

[0014] Furthermore, the pull rod is threadedly connected to one end of the piston of the cylinder to facilitate installation and disassembly between the piston and the pull rod.

[0015] The machining center milling tooling of the utility model has at least the following beneficial effects: through the guide structure on the positioning part, when the expansion sleeve is installed on the pull rod, it only needs to be pushed toward the positioning part side along the axial direction of the expansion sleeve. When passing through the guide structure, the guide structure guides one side of the inner ring of the expansion sleeve to be forced to open until the inner ring is stuck in the positioning part. The entire expansion sleeve opening process does not require manual pulling, which greatly reduces the difficulty of installing the expansion sleeve and improves assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a side sectional view of the utility model;

[0019] Figure 3 for Figure 2 An enlarged view of section A is shown;

[0020] Figure 4 This is a schematic diagram of the structure of the utility model after the pull rod and the expansion sleeve are hidden;

[0021] Figure 5 for Figure 4 An enlarged view of portion B is shown;

[0022] Figure 6 It is a top view of the elastic clamping part of the utility model.

[0023] The meanings of the symbols in the accompanying drawings are:

[0024] Base-1; vertebral body-2; base-21; conical end-22; abutting surface-23; through hole-24; positioning screw-25; cylinder-3; expansion sleeve-4; inner ring-41; pull rod-5; matching end-51; slide groove-52; positioning part-6; inner retaining ring-61; outer retaining ring-62; guide structure-63; first guide inclined surface-631; second guide inclined surface-632; annular groove-64; convex bulge-65; elastic clamping part-7; limit block-71; tip-72; third guide inclined surface-73; spring piece-74. DETAILED DESCRIPTION

[0025] The utility model will be further described below in conjunction with the accompanying drawings.

[0026] like Figures 1 to 6 As shown, the milling tool of the machining center of the utility model includes a base 1, a vertebral body 2 installed on the base 1, a cylinder 3 installed on the base 1 and coaxially distributed with the vertebral body 2, an expansion sleeve 4 with an inner ring 41 at one end, a pull rod 5 connected to one end of the piston of the cylinder 3, and a positioning portion 6 arranged on the end of the pull rod 5 away from the cylinder 3. The base 1 is used to support the cylinder 3 and the vertebral body 2, the cylinder 3 is used to drive the pull rod 5 to move in the axial direction, and the positioning portion 6 is used to position the expansion sleeve 4 so that the expansion sleeve 4 can move with the pull rod 5; after the workpiece is sleeved on the pull rod 5, the pull rod 5 drives the expansion sleeve 4 to move so that it can be pressed tightly between the expansion sleeve 4 and the pull rod 5, thereby fixing the workpiece.

[0027] In this embodiment, the base 1 is a T-shaped structure, the bottom of the base 1 is horizontal to be supported on the ground or a workbench, the cylinder 3 and the vertebral body 2 are fixed to the vertical part of the base 1 by bolts, and the cylinder 3 and the vertebral body 2 are arranged on opposite sides of the base 1 and are coaxially and cocentrically distributed. The material of the base 1 can be made of a hard material with high strength and rigidity such as stainless steel.

[0028] In this embodiment, the vertebral body 2 is a columnar structure, and one end of the vertebral body 2 has a base 21, the width of the base 21 is much larger than the diameter or width of the vertebral body 2, a first threaded hole is provided on the base 21, and a second threaded hole is provided at a position corresponding to the first threaded hole on the base 1, and the connection between the vertebral body 2 and the base 1 is achieved by screwing screws in the first threaded hole and the second threaded hole. A conical end 22 is formed on the end of the vertebral body 2 away from the base 21 along the axial direction of the vertebral body 2 toward the side away from the base 21, and the end of the vertebral body 2 away from the base 21 has an end face, and the conical end 22 is formed by convexly extending from the end face. The conical end 22 has a cylindrical connecting section and a truncated cone section, and the vertebral body 2, the connecting section and the conical section are sequentially integrally formed and coaxially distributed. Among them, the conical section has a large head end with the same diameter as the connecting section and connected to the connecting section, and a small head end with a diameter smaller than the connecting section, and the expansion sleeve 4 and the workpiece are both inserted into the conical end 22 from the side of the small head end. In order to limit the movement of the workpiece during the positioning of the workpiece by the expansion sleeve 4, a circular abutment surface 23 is formed at the connection between the vertebral body 2 and the conical end 22, extending outward along the radial direction of the vertebral body 2 relative to the outer periphery of the vertebral body 2. The abutment surface 23 is formed by the end surface of the main body of the vertebral body 2 close to the conical end 22 and the part located at the outer periphery of the conical end 22. The outer ring diameter of the abutment surface 23 is usually required to be larger than the inner hole diameter of the workpiece, so that when the workpiece is sleeved on the conical end 22, the expansion sleeve 4 will press the workpiece when squeezing the workpiece to prevent the workpiece from continuing to move, thereby providing support for the expansion sleeve 4 to position the workpiece. It should be noted that the axial direction mentioned in the present utility model is the axial direction of the vertebral body 2.

[0029] In the content defined in this embodiment, since there is a gap between the inner hole of the workpiece and the cone 2 before the expansion sleeve 4 is positioned, the expansion sleeve 4 can be inserted into it. At this time, the workpiece is affected by gravity and relatively droops. When the pull rod 5 drives it to move, it is necessary to manually or use an instrument to drag the workpiece to keep it in a centered state, otherwise the expansion sleeve 4 driven by the pull rod 5 cannot enter the gap between the workpiece and the cone end 22 and cannot position the workpiece. For this reason, an elastic clamping portion 7 protruding along the axial direction is provided on the abutting surface 23, and an adaptive clamping groove can be opened at the corresponding position of the workpiece. The elastic clamping portion 7 is used to be clamped in the clamping groove on the workpiece so that the inner hole of the workpiece is coaxial with the cone end 22, so that there is no need to manually center the workpiece or use auxiliary instruments to center the workpiece. The elastic clamping portion 7 includes a limit block 71 with a square block structure, and the limit block 71 is formed by extending from the abutting surface 23 along the axial direction toward the side away from the cylinder 3. In order to facilitate the limit block 71 to quickly enter the card slot, a tip 72 is provided on the end of the limit block 71 away from the supporting surface 23, and a third guide slope 73 is provided on the two opposite sides of the tip 72 from the side close to the cylinder 3 toward the side away from the cylinder 3, so that the width of the tip 72 away from the cylinder 3 is smaller than the width of the card slot so that it can quickly enter the card slot. The structure of the tip 72 is a quadrangular pyramid structure, and the width of the end with a larger width of the tip 72 is slightly smaller than the width of the card slot, that is, the difference between the maximum width of the tip 72 and the width of the card slot is within 2 mm. The locking cam 74 is provided with two springs 74 fixedly connected to the locking cam 71, wherein the width of the locking cam 71 is smaller than the width of the end with the larger width of the tip 72 and is integrally formed with the tip 72. For this reason, an L-shaped notch is formed on the two opposite side walls of the locking cam 71 relative to the tip 72, and the springs 74 are located in the L-shaped notch. The springs 74 are V-shaped, and one end of the two springs 74 is respectively fixedly connected to the third guide bevel 73 on one side close to the cylinder 3, so that the third guide bevel 73 extends to one side of the cylinder 3 and is flush with the springs 74, so that the springs 74 will not affect the fit between the locking cam 71 and the locking cam 71. The spring piece 74 extends obliquely from the third guide surface toward the side of the cylinder 3 and in the radial direction away from the side of the limit block 71, and then bends and extends toward the side of the limit block 71. The spring piece 74 is made of a material with elasticity and self-recovery ability, such as copper, so that it can be pressed against the inner wall of the card slot after the limit block 71 enters the card slot, thereby preventing the limit block 71 from loosening relative to the card slot.

[0030] In this embodiment, a through hole is provided on the base 1 along the axial direction for one end of the piston of the cylinder 3 to move through. After the cylinder 3 is connected to the base 1, the piston passes through the through hole to extend toward one side of the vertebral body 2. A through hole 24 is provided on the vertebral body 2, the base 21 and the tapered end 22 along the axial direction for one end of the piston of the cylinder 3 to move through. The through hole 24 is coaxially distributed with the through hole. After one end of the piston of the cylinder 3 passes through the through hole, it can move into the through hole 24. In this embodiment, the expansion sleeve 4 is a cylindrical ring structure, and the inner ring 41 is located on the inner wall of the side away from the cylinder 3 and is annular. The side of the inner ring 41 away from the cylinder 3 is flush with the side of the expansion sleeve 4 away from the cylinder 3. The outer diameter of the expansion sleeve 4 is smaller than the inner hole diameter of the workpiece and larger than the diameter of the small head end of the tapered end 22 when no external force is applied.

[0031] In this embodiment, one end of the pull rod 5 can be inserted into the through hole 24 and connected to one end of the piston of the cylinder 3, and the end of the pull rod 5 away from the cylinder 3 is inserted outside the vertebral body 2, so that the operation of the cylinder 3 can drive the pull rod 5 to move in the axial direction. The pull rod 5 has a connecting end connected to one end of the piston of the cylinder 3 and movably inserted into the through hole 24 and a matching end 51 that is always located outside the side of the vertebral body 2 away from the cylinder 3. The positioning part 6 is integrally formed on the matching end 51 of the vertebral body 2 to facilitate the matching between the positioning part 6 and the expansion sleeve 4. The pull rod 5 has a cylindrical structure and is coaxially distributed with the vertebral body 2. In order to facilitate the installation of the expansion sleeve 4, the connecting end of the pull rod 5 is threadedly connected to one end of the piston of the cylinder 3. A thread groove that is consistent with the outer contour of the connecting end and matched can be recessed on one end of the piston of the cylinder 3. A thread is set on the thread groove and the connecting end to achieve thread matching, which is convenient for the installation and removal of the pull rod 5. A positioning screw hole connected to the through hole 24 is opened in the radial direction on the main body of the vertebral body 2, and a positioning screw 25 is arranged in the positioning screw hole. A strip-shaped slide groove 52 is recessed on the outer wall where the pull rod 5 passes through the through hole 24 and corresponds to the position of the positioning screw hole. The positioning screw 25 extends into the slide groove 52 and can slide in the slide groove 52 along the axial direction relative to the slide groove 52, so as to limit the rotation of the pull rod 5 to a certain extent.

[0032] In this embodiment, the positioning portion 6 is arranged on the mating end 51 of the tie rod 5 to fix the expansion sleeve 4. The positioning portion 6 includes an inner retaining ring 61 arranged in an annular shape around the outer periphery of the mating end 51 of the tie rod 5, an outer retaining ring 62 arranged in an annular shape around the outer periphery of the tie rod 5, and a guide structure 63 formed on the inner retaining ring 61. The inner retaining ring 61 is located on the side facing the cylinder 3 relative to the outer retaining ring 62. An annular groove 64 for the inner ring 41 to be clamped therein is formed between the inner retaining ring 61 and the outer retaining ring 62. The inner retaining ring 61 cooperates with the outer retaining ring 62 to position the expansion sleeve 4 after the inner ring 41 of the expansion sleeve 4 is clamped therein, so that the tie rod 5 drives the expansion sleeve 4 to move and support the expansion sleeve 4. The guide structure 63 allows the expansion sleeve 4 to move when the tie rod 5 and the expansion sleeve 4 are assembled. The expansion sleeve 4 is stretched outward by sliding in the axial direction until the inner ring 41 of the expansion sleeve 4 passes through the inner retaining ring 61 to enter the annular groove 64. During the whole process, there is no need to manually push the expansion sleeve 4 outward in the radial direction. The expansion sleeve 4 only needs to be squeezed in the axial direction. The guide structure 63 naturally opens the expansion sleeve 4 outward so that it can be assembled on the positioning part 6. The expansion sleeve 4 and the pull rod 5 can also be assembled without moving the expansion sleeve 4. When the expansion sleeve 4 is sleeved on the conical end 22, the pull rod 5 drives the positioning part 6 to move toward the side of the cylinder 3 to achieve the sliding fit between the guide structure 63 and the expansion sleeve 4 until installation is achieved. The whole assembly method is simple and labor-saving, and even no other devices are required.

[0033] In the content defined in this embodiment, the inner retaining ring 61 is in the form of a circular ring and is sleeved on the mating end 51 of the pull rod 5, and the inner wall of the inner retaining ring 61 is integrally formed with the pull rod 5 and extends outward from the outer wall of the pull rod 5 in the radial direction. The outer diameter of the inner retaining ring 61 is preferably smaller than or equal to the inner diameter of the expansion sleeve 4 on the side close to the inner ring 41. When the outer diameter of the inner retaining ring 61 is equal to the inner diameter of the inner ring 41 of the expansion sleeve 4, it is beneficial for the outer wall of the inner retaining ring 61 to be supported on the inner wall of the expansion sleeve 4 when the inner ring 41 is inserted into the annular groove 64, so as to improve the stability between the expansion sleeve 4 and the pull rod 5. When the outer diameter of the inner retaining ring 61 is smaller than the inner diameter of the inner ring 41 of the expansion sleeve 4, the extrusion between the inner retaining ring 61 and the expansion sleeve 4 is reduced, thereby facilitating the installation of the expansion sleeve 4.

[0034] In the content defined in this embodiment, the outer retaining ring 62 is annular and is sleeved on the mating end 51 of the tie rod 5, and the inner wall of the outer retaining ring 62 is formed integrally with the tie rod 5 and extends outward from the outer wall of the tie rod 5 in the radial direction. The outer diameter of the outer retaining ring 62 is greater than the inner diameter of the inner ring 41, so that the side of the outer retaining ring 62 close to the cylinder 3 can abut against the side surface of the expansion sleeve 4 away from the cylinder 3, so that when the tie rod 5 moves toward the cylinder 3 and the expansion sleeve 4 is inserted into the gap between the workpiece and the tapered end 22, the expansion sleeve 4 is squeezed and supported toward the gap. In this embodiment, the gap between the inner retaining ring 61 and the outer retaining ring 62 is an annular groove 64, and the inner diameter of the annular groove 64 is equal to the inner diameter of the inner ring 41, so that when the inner ring 41 is inserted into the annular groove 64, the inner side wall abuts against the inner wall of the annular groove 64 facing the tie rod 5, so as to increase the contact area between the expansion sleeve 4 and the annular groove 64 and improve stability. In order to facilitate the inner ring 41 to enter the annular groove 64, the width of the annular groove 64 (that is, the length of the annular groove 64 in the axial direction) is greater than the width of the inner ring 41. Therefore, the inner ring 41 is in a loose state relative to the annular groove 64 and can move in the axial direction. In order to prevent the expansion sleeve 4 from loosening, a bulge 65 can be formed on the side surface of the outer retaining ring 62 close to the cylinder 3 in the axial direction toward the side of the cylinder 3. The distance between the bulge 65 and the side of the inner retaining ring 61 away from the cylinder 3 is less than or equal to the width of the inner ring 41, and the bulge 65 is located on the side away from the pull rod 5 relative to the outer retaining ring 62 in the radial direction, so that the bulge 65 not only affects the inner ring 41 from entering the annular groove 64, but also can press against the inner ring 41 that is clamped in the annular groove 64, thereby limiting the movement of the expansion sleeve 4 in the axial direction and preventing the expansion sleeve 4 from loosening.

[0035] In the content defined in this embodiment, the guide structure 63 includes a first guide bevel 631 formed along the circumferential direction on the side of the inner retaining ring 61 close to the cylinder 3 and a second guide bevel 632 formed at the position of the inner ring 41 corresponding to the first guide bevel 631. After the expansion sleeve 4 and the inner retaining ring 61 approach each other, the first guide bevel 631 and the second guide bevel 632 contact each other and slide and squeeze together along the inclined direction, so that the side of the inner ring 41 of the expansion sleeve 4 is stretched open until it enters the annular groove 64. The first guide slope 631 is arranged from narrow to wide from the side of the inner retaining ring 61 close to the cylinder 3 to the side of the outer retaining ring 62, and the second guide slope 632 is arranged from wide to narrow from the side of the outer retaining ring 62 away from the cylinder 3 to the side of the inner retaining ring 61, and the first guide slope 631 and the second guide slope 632 have the same inclination and are parallel, so that when the expansion sleeve 4 gradually approaches the inner retaining ring 61, the first guide slope 631 and the second guide slope 632 will first contact and cooperate with each other to guide each other so that when the pull rod 5 or the expansion sleeve 4 is moved in the axial direction, the expansion sleeve 4 is gradually opened outward in the radial direction, thereby reducing the installation difficulty between the expansion sleeve 4 and the pull rod 5. It should be noted that the guide structure 63 may not include the second guide slope 632, and when the expansion sleeve 4 is pushed in the axial direction without the second guide slope 632, the first guide slope 631 can also slide and press with the expansion sleeve 4 to open the expansion sleeve 4.

[0036] The working method of one embodiment of the milling tool of the machining center of the utility model is as follows: first, the workpiece is sleeved on the tapered end 22, and the elastic clamping portion 7 is clamped into the clamping groove of the workpiece to position the workpiece, and the expansion sleeve 4 is sleeved on the pull rod 5 from the side of the pull rod 5 close to the cylinder 3 until the inner ring 41 is clamped into the annular clamping groove 64, so that one end of the piston of the cylinder 3 is extended, and after the connecting end of the pull rod 5 is connected to one end of the piston of the cylinder 3, the cylinder 3 is operated to shrink one end of the piston, and the pull rod 5 moves toward one side of the cylinder 3 with the piston of the cylinder 3 so that the expansion sleeve 4 is gradually squeezed into the gap between the workpiece and the tapered end 22, until the expansion sleeve 4 is pressed against the workpiece to complete the positioning of the workpiece.

Claims

1. A milling tool for a machining center, comprising a base, a vertebral body mounted on the base, a cylinder mounted on the base and coaxially distributed with the vertebral body, and an expansion sleeve with an inner ring at one end, one end of the piston of the cylinder movably penetrates into the vertebral body along the axial direction, and a pull rod movably penetrates out of the vertebral body toward a side away from the cylinder is connected to one end of the piston of the cylinder, and the vertebral body has a conical end, characterized in that: A positioning portion for positioning the expansion sleeve is provided on one end of the pull rod away from the cylinder, and a guiding structure is provided on the positioning portion to enable the expansion sleeve to slide onto the positioning portion along the axial direction.

2. The milling tool for a machining center as claimed in claim 1, characterized in that: The connection between the vertebral body and the cone end extends outwardly in a radial direction relative to the outer periphery of the vertebral body to form a circular annular abutting surface.

3. The milling tool for a machining center as claimed in claim 1, characterized in that: The pull rod has a connecting end connected to one end of the cylinder piston and movably inserted into the vertebral body, and a mating end always located outside the vertebral body on a side away from the cylinder, and the positioning portion is integrally formed on the mating end; the positioning portion includes an inner retaining ring arranged in a ring shape around the outer circumference of the pull rod and an outer retaining ring arranged in a ring shape around the outer circumference of the pull rod, the inner retaining ring is located on the side facing the cylinder relative to the outer retaining ring, an annular groove is formed between the inner retaining ring and the outer retaining ring for the inner ring to be clamped therein, and the guide structure is formed on the inner retaining ring.

4. The milling tool for a machining center as claimed in claim 3, characterized in that: The outer diameter of the inner retaining ring is less than or equal to the inner diameter of the expansion sleeve on the side close to the inner ring.

5. The milling tool for a machining center as claimed in claim 4, characterized in that: The guide structure comprises a first guide slope formed along the circumferential direction on a side of the inner retaining ring close to the cylinder and a second guide slope formed at a position of the inner ring corresponding to the first guide slope.

6. The milling tool for a machining center as claimed in claim 5, characterized in that: A convex bump is formed on one side of the outer buckle ring close to the cylinder along the axial direction toward one side of the cylinder and is used to press against the inner ring.

7. The milling tool for a machining center as claimed in claim 2, characterized in that: The abutting surface is provided with an elastic clamping portion protruding along the axial direction, and the elastic clamping portion is used for clamping in a clamping groove formed on the workpiece.

8. The milling tool for a machining center as claimed in claim 7, characterized in that: The elastic clamping portion is provided with an elastic sheet for elastically pressing against the inner wall of the clamping slot.

9. The milling tool for a machining center as claimed in claim 8, characterized in that: The elastic clamping part has a third guiding inclined surface on one side away from the cylinder, the width of which is smaller than the width of the clamping groove, and the third guiding inclined surface extends to one side of the spring sheet and is flush with it.

10. The milling tool for a machining center as claimed in claim 1, characterized in that: The pull rod is threadedly connected to one end of the piston of the cylinder.

Images