Multi-angle machining milling head for numerical control machining center

Abstract

This invention relates to the field of milling technology and discloses a multi-angle milling head for CNC machining centers, comprising a spindle connector, a rotary seat, an output seat, and a clamping mechanism. The clamping mechanism clamps and fixes a milling cutter. The clamping mechanism includes a drive shaft, with a connecting flange rotatably connected to the outside of the drive shaft. The connecting flange is used to install the drive shaft to the bottom of the output seat. The clamping mechanism also includes a positioning sleeve. The bottom of the drive shaft is provided with a threaded opening. The positioning sleeve is threaded to the outside of the threaded opening. A collet is rotatably connected inside the positioning sleeve. An inner collet is engaged inside the drive shaft and sleeved on the outside of the collet. By setting a limiting block, a transverse groove, and an outer shaft groove between the inner collet and the drive shaft, the axial degree of freedom of the inner collet is increased, thereby effectively reducing the threaded engagement force between the threaded opening and the positioning sleeve during disassembly. This effectively reduces the difficulty of disassembling the milling cutter and improves the efficiency of milling cutter replacement.

Description

Technical Field

[0001] This invention relates to the field of milling technology, specifically to a multi-angle milling head for CNC machining centers. Background Technology

[0002] When using CNC machining centers for intelligent manufacturing, the rotation of milling cutters is typically controlled to perform machining functions such as boring, milling, reaming, and tapping. The milling head is a machine tool accessory mounted on a milling machine or machining center, used to connect the milling cutter and the machining center. The milling cutter is held at the output end of the milling head by a clamping unit. The clamping stability of the milling cutter, as well as the efficiency of changing the milling cutter during the machining process, will affect the machining quality and efficiency of the machining center.

[0003] Chinese patent CN115815677A discloses a multi-angle milling head for a machine tool machining center, comprising a mounting sleeve. A rotating part connecting end is mounted on one side of the outer wall of the mounting sleeve, and a spindle assembly is arranged along the axial direction inside the mounting sleeve. A chuck sleeve is provided at the lower end of the spindle assembly, and a tool body is mounted on the chuck sleeve. Assembly protection structures are provided at the middle and bottom positions of the spindle assembly. By adopting a step-by-step tool unloading method, during the automatic tool unloading process, the chuck sleeve loses the clamping force originating from the locking sleeve, thereby avoiding the tool falling off and colliding with the workpiece due to one-time disassembly.

[0004] Although the above invention protects the tool by increasing the tool disassembly process through step-by-step force relief, the tool is still in a state where it can fall during the force relief process. As the force relief continues, the risk of the tool falling also increases. Although it can reduce the risk of the tool colliding with the workpiece to a certain extent, it does not fundamentally solve the problem of the tool falling and colliding with the workpiece.

[0005] The invention also discloses that: the portion of the assembly protection structure located in the middle section of the spindle assembly is configured as a primary protection structure, and the portion of the assembly protection structure located at the bottom of the spindle assembly is configured as a secondary protection structure; the secondary protection structure includes a fastening ring and four locking sleeves, four connecting blocks are installed on the outer curved surface of the fastening ring, and the connecting blocks extend to the outer side of the outer wall of the mounting sleeve, the mounting sleeve has through grooves that match the connecting blocks, and a cylinder telescopic joint sleeve corresponding to the connecting blocks is installed at the lower end of the outer wall of the mounting sleeve, and the transmission rod of the cylinder telescopic joint sleeve is connected to the connecting blocks.

[0006] The invention described above uses a cylinder telescopic joint sleeve to disassemble the tool. Although using a cylinder telescopic joint sleeve to control the disassembly and installation of the tool can improve the tool replacement efficiency, it greatly increases the cost and complexity of the equipment. Furthermore, the airtightness of the cylinder has a significant impact on the stability of the tool installation. At the same time, the existing method of fixing the tool with a threaded connection and collet can also achieve tool fixation at a lower cost, but during tool replacement, there is a problem of thread lock-up and difficulty in opening, which greatly affects the tool replacement efficiency. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a multi-angle milling head for CNC machining centers, which offers advantages such as stable clamping of the milling cutter, simple tool changing operation, and effective prevention of the milling cutter falling off during tool changing, thus ensuring the safety of the milling cutter.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A CNC machining center uses a multi-angle milling head, including a spindle connector, a rotary seat, an output seat, and a clamping mechanism. The clamping mechanism clamps and fixes a milling cutter. The clamping mechanism includes a drive shaft, and a connecting flange is rotatably connected to the outside of the drive shaft. The connecting flange is used to install the drive shaft to the bottom of the output seat.

[0010] The clamping mechanism also includes a positioning sleeve, a threaded opening at the bottom of the drive shaft, a positioning sleeve threadedly connected to the outside of the threaded opening, a collet rotatably connected inside the positioning sleeve, an inner clamping sleeve snapped into the inside of the drive shaft, and the inner clamping sleeve sleeved on the outside of the collet.

[0011] The internal output end of the output base also includes an inner positioning rod, the bottom of which is rotatably connected to an inner sleeve rod, and the outside of the inner sleeve rod is provided with an anti-disengagement mechanism and an inner locking mechanism;

[0012] The anti-detachment mechanism is used to limit the axial movement of the collet, and the inner locking mechanism is used to limit the radial rotation of the inner sleeve.

[0013] The inner sleeve is fixedly connected to a limiting block, and the transmission shaft has an outer shaft groove inside. The bottom of the outer shaft groove has a transverse groove, and the limiting block can slide into the outer shaft groove and the transverse groove respectively.

[0014] Preferably, the anti-detachment mechanism includes a movable rod that is inserted through the circumference of the inner sleeve rod. A support plate is fixedly connected to the bottom of the movable rod. The support plate includes an elastic connecting strip and a card block. The elastic connecting strip is fixed to the bottom side of the movable rod by screws, and the card block can be inserted into the gap groove of the collet.

[0015] Preferably, the movable rods are arranged in several groups, evenly distributed on the outside of the inner sleeve rod, and the movable rods can slide up and down on the outside of the inner sleeve rod, with connecting rings snapped onto the top of the movable rods.

[0016] Preferably, the collet is provided with a limiting mechanism inside. The limiting mechanism includes a beveled groove evenly opened on the inner side of the collet, a limiting ball is placed inside the beveled groove, and a support ring is sleeved on the outside of several limiting balls.

[0017] Preferably, the beveled groove is configured as an inverted triangle, gradually deepening from bottom to top. The limiting ball moves between the support ring and the beveled groove. The support ring has a circular hole adapted to the limiting ball. The inner diameter of the circular hole is smaller than the diameter of the limiting ball. The spherical surface of the limiting ball can abut against the end mill and the bottom of the beveled groove respectively.

[0018] Preferably, the inner side of the collet is also provided with an annular groove adapted to the support ring. The groove depth is greater than the thickness of the support ring, and the groove width is adapted to the height of the inclined groove, so that the support ring can slide axially in the annular groove.

[0019] Preferably, the inner sleeve is internally connected to a pull rod, a tension spring is provided between the pull rod and the inner sleeve, and the bottom of the pull rod is provided with a magnetic component, so that the pull rod can magnetically adhere to the top of the milling cutter.

[0020] Preferably, the inner locking mechanism includes several locking rods rotatably connected to the outside of the inner sleeve rod, with a locking block fixedly connected to the outer end of the locking rod. The locking rod includes a transversely penetrating narrow groove, and a synchronizing ring is movably connected inside the narrow groove of the several locking rods. An inner locking groove is opened at the top of the inner sleeve, and the locking block is engaged inside the inner locking groove.

[0021] Preferably, a spiral spring is provided between the locking rod and the inner sleeve rod, and the spiral spring drives the locking rod to tend to rotate upward.

[0022] The beneficial effects of this invention are:

[0023] 1. This CNC machining center uses multi-angle milling heads. By setting limit blocks, transverse grooves and outer shaft grooves between the inner sleeve and the transmission shaft, the axial degree of freedom of the inner sleeve is increased, thereby effectively reducing the threaded connection engagement force between the threaded opening and the positioning sleeve during disassembly. This effectively reduces the difficulty of disassembling the milling cutter and improves the efficiency of milling cutter replacement.

[0024] 2. This CNC machining center uses a multi-angle milling head. By setting a limiting mechanism, it effectively avoids the situation where the clamping force of the collet on the milling cutter gradually decreases during the rotation and removal of the positioning sleeve when changing the milling cutter, thus preventing the milling cutter from accidentally falling off. This ensures that the milling cutter can remain in the collet when the positioning sleeve is removed, thereby effectively ensuring the safety of the milling cutter and preventing it from falling and breaking. At the same time, the anti-disengagement mechanism further protects the safety of the positioning sleeve and collet, thereby improving the overall safety during the tool changing process and greatly reducing the risk of tool falling.

[0025] 3. This CNC machining center uses a multi-angle milling head. By setting a tie rod, when the milling cutter is inserted into the collet, the top of the milling cutter attracts the tie rod under the action of magnetic force, so that the tie rod attracts the milling cutter and completes the initial fixation of the milling cutter. The tie rod also has an upward pulling force on the milling cutter, thereby preventing the milling cutter from shifting downward during the installation process and ensuring the installation stability of the milling cutter. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the main body of the multi-angle machining milling head of the present invention;

[0027] Figure 2 This is a schematic diagram of the output socket structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the main body of the clamping mechanism of the present invention;

[0029] Figure 4 This is a partial cross-sectional view of the clamping mechanism of the present invention;

[0030] Figure 5 This is a schematic diagram of the transmission shaft of the present invention;

[0031] Figure 6 This is a schematic diagram of the collet holding the milling cutter according to the present invention;

[0032] Figure 7 This is a cross-sectional schematic diagram of the inner sleeve and inner sleeve rod of the present invention;

[0033] Figure 8 This is a schematic diagram of the collet, milling cutter, and limiting mechanism of the present invention;

[0034] Figure 9 For the present invention Figure 8 Enlarged schematic diagram of part A;

[0035] Figure 10 This is a schematic diagram of the anti-detachment mechanism of the present invention.

[0036] In the diagram: 1. Spindle connector; 2. Rotary base; 3. Output base; 4. Clamping mechanism; 5. Connecting flange; 6. Milling cutter; 7. Internal positioning rod;

[0037] 41. Drive shaft; 42. Positioning sleeve; 43. Inner sleeve; 44. Collet; 45. Anti-detachment mechanism; 46. Inner locking mechanism; 47. Pull rod; 48. Inner sleeve rod; 49. Limiting mechanism;

[0038] 411. Threaded opening; 412. External shaft groove; 413. Transverse groove;

[0039] 431. Limiting block; 432. Inner locking groove; 441. Angled groove;

[0040] 451. Movable rod; 452. Support plate; 453. Connecting ring;

[0041] 461. Locking rod; 462. Locking block; 463. Synchronizing ring;

[0042] 471. Tension spring;

[0043] 491. Limiting ball; 192. Support ring. Detailed Implementation

[0044] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example

[0046] Please see Figure 1 - Figure 10 A multi-angle milling head for CNC machining center includes a spindle connector 1, a rotary seat 2, an output seat 3, and a clamping mechanism 4. The clamping mechanism 4 clamps and fixes a milling cutter 6. The clamping mechanism 4 includes a drive shaft 41. A connecting flange 5 is rotatably connected to the outside of the drive shaft 41. The connecting flange 5 is used to install the drive shaft 41 on the bottom of the output seat 3.

[0047] The clamping mechanism 4 also includes a positioning sleeve 42. The bottom of the transmission shaft 41 is provided with a threaded opening 411. The positioning sleeve 42 is threaded to the outside of the threaded opening 411. The inside of the positioning sleeve 42 is rotatably connected to a collet 44. The inside of the transmission shaft 41 is engaged with an inner clamping sleeve 43, which is sleeved on the outside of the collet 44.

[0048] The internal output end of the output base 3 also includes an inner positioning rod 7. The bottom of the inner positioning rod 7 is rotatably connected to an inner sleeve rod 48. An anti-detachment mechanism 45 and an inner locking mechanism 46 are provided on the outside of the inner sleeve rod 48.

[0049] The anti-detachment mechanism 45 is used to limit the axial movement of the collet 44, and the inner locking mechanism 46 is used to limit the radial rotation of the inner sleeve 43.

[0050] The inner sleeve 43 is fixedly connected to the outside of the limiting block 431. The transmission shaft rod 41 has an outer shaft groove 412 inside. The bottom of the outer shaft groove 412 has a transverse groove 413. The limiting block 431 can slide into the outer shaft groove 412 and the transverse groove 413 respectively.

[0051] During operation, the machine tool machining center drives the rotary table 2 and the output table 3 to perform milling. During the milling process, the milling cutter 6 can be controlled to rotate at multiple angles to adapt to the milling of different parts. This is existing technology and will not be described in detail.

[0052] refer to Figures 4-8 When installing the milling cutter 6, insert the milling cutter 6 into the collet 44. By rotating the positioning sleeve 42, the positioning sleeve 42 rotates outside the transmission shaft 41, thereby pushing the positioning sleeve 42 to move relative to the inner sleeve 43. The inner sleeve 43 presses the collet 44 inward, thereby achieving the clamping and fixing of the milling cutter 6.

[0053] It should be noted that, in the initial state, the limiting block 431 of the inner sleeve 43 is engaged in the transverse groove 413 of the transmission shaft rod 41. When the positioning sleeve 42 is rotated to clamp the milling cutter 6, the limiting block 431 tends to slide into the transverse groove 413, thereby ensuring the axial position stability of the inner sleeve 43 and the transmission shaft rod 41, and thus ensuring the stable compression of the inner sleeve 43 on the collet 44, so that the collet 44 can stably clamp the milling cutter 6.

[0054] Furthermore, when the milling cutter 6 needs to be replaced, the positioning sleeve 42 is rotated in the direction. Under the action of friction, the positioning sleeve 42 generates a lateral torque on the collet 44 and the inner sleeve 43, which allows the inner sleeve 43 to rotate in the opposite direction. This allows the limiting block 431 to slide out of the transverse groove 413. At this time, the limiting block 431 slides in the outer shaft groove 412, giving the inner sleeve 43 axial freedom in the transmission shaft 41. This eliminates the axial stress between the inner sleeve 43 and the collet 44, thereby reducing the thread engagement force between the threaded opening 411 and the positioning sleeve 42, facilitating the removal of the positioning sleeve 42, and reducing the difficulty of disassembling the milling cutter 6.

[0055] By setting a limiting block 431, a transverse groove 413, and an outer shaft groove 412 between the inner sleeve 43 and the drive shaft rod 41, the axial degree of freedom of the inner sleeve 43 is increased, thereby effectively reducing the threaded connection biting force between the threaded opening 411 and the positioning sleeve 42 during disassembly, thus effectively reducing the disassembly difficulty of the milling cutter 6 and improving the efficiency of milling cutter 6 replacement.

[0056] refer to Figure 4 , Figure 6 and Figure 10In an optional embodiment, the anti-detachment mechanism 45 includes a movable rod 451 that is inserted through the circumference of the inner sleeve rod 48. A support plate 452 is fixedly connected to the bottom of the movable rod 451. The support plate 452 includes an elastic connecting strip and a card block. The elastic connecting strip is fixed to the bottom side of the movable rod 451 by screws, and the card block can be inserted into the gap groove of the collet 44.

[0057] In an optional embodiment, several sets of movable rods 451 are provided and evenly distributed on the outside of the inner sleeve rod 48. The movable rods 451 can slide up and down on the outside of the inner sleeve rod 48, and a connecting ring 453 is engaged at the top of several movable rods 451.

[0058] It should be noted that the card block can be inserted into or slid out of the intermittent groove of the collet 44 by pressing down the elastic connecting strip. When the support plate 452 is inserted into the intermittent groove of the collet 44, when the collet 44 and the positioning sleeve 42 are disengaged from the drive shaft rod 41, the inner sleeve rod 48 can support the collet 44 and the positioning sleeve 42 through the support plate 452 to prevent the collet 44 and the positioning sleeve 42 from falling off.

[0059] refer to Figure 8 and Figure 9 In an optional embodiment, the collet 44 is provided with a limiting mechanism 49 inside. The limiting mechanism 49 includes a beveled groove 441 evenly opened on the inner side of the collet 44. A limiting ball 491 is placed inside the beveled groove 441, and a support ring 192 is sleeved on the outside of a plurality of limiting balls 491.

[0060] In an optional embodiment, the beveled groove 441 is configured as an inverted triangle, gradually deepening from bottom to top. The limiting ball 491 moves between the support ring 192 and the beveled groove 441. The support ring 192 has a circular hole adapted to the limiting ball 491. The inner diameter of the circular hole is smaller than the diameter of the limiting ball 491. The spherical surface of the limiting ball 491 can abut against the end mill 6 and the bottom of the beveled groove 441 respectively.

[0061] The inner side of the collet 44 is also provided with an annular groove adapted to the support ring 192. The groove depth is greater than the thickness of the support ring 192, and the groove width is adapted to the height of the inclined groove 441. The support ring 192 can slide axially in the annular groove.

[0062] It should be noted that when the milling cutter 6 is pushed upward, the milling cutter 6 drives the limiting ball 491 to move upward, causing the limiting ball 491 to slide into the deep part of the inclined groove 441. At this time, the milling cutter 6 can slide in smoothly. When it is necessary to pull out the milling cutter 6, the milling cutter 6 drives the limiting ball 491 to move downward, and the limiting ball 491 enters the shallow part of the inclined groove 441, so that the collet 44 squeezes the milling cutter 6 through the limiting ball 491, increasing the pull-out resistance of the milling cutter 6.

[0063] By setting a limiting mechanism 49, the clamping force of the collet 44 on the milling cutter 6 gradually decreases during the rotation and removal of the positioning sleeve 42 when changing the milling cutter 6, which could cause the milling cutter 6 to fall accidentally. This ensures that the milling cutter 6 can remain in the collet 44 when the positioning sleeve 42 is removed, thereby effectively ensuring the safety of the milling cutter 6 and preventing it from falling and breaking. At the same time, the anti-disengagement mechanism 45 further protects the safety of the positioning sleeve 42 and the collet 44, thereby improving the overall safety during the tool changing process and greatly reducing the risk of tool falling.

[0064] In an optional embodiment, a pull rod 47 is movably connected inside the inner sleeve rod 48, and a tension spring 471 is provided between the pull rod 47 and the inner sleeve rod 48. The bottom of the pull rod 47 is provided as a magnetic element, and the pull rod 47 can magnetically adhere to the top of the milling cutter 6.

[0065] It should be noted that when the end mill 6 is installed, the pull rod 47 is magnetically attached to the top of the end mill 6, and at this time the pull rod 47 is in the state of tension spring 471. The pull rod 47 has an upward axial force on the end mill 6, thereby preventing the end mill 6 from moving downward under the action of gravity during installation. This keeps the limit ball 491 between the collet 44 and the end mill 6, preventing the limit ball 491 from interfering with the collet 44's fixation of the end mill 6. Under the action of the tension spring 471, the influence of the end mill 6's gravity is effectively eliminated, thereby ensuring the contact stability between the collet 44 and the end mill 6. This prevents the collet 44 from making point contact with the end mill 6 through the limit ball 491, ensuring that the collet 44 completes the clamping and fixation of the end mill 6 through surface contact, thus ensuring the stability of the end mill 6 installation.

[0066] It should be noted that by setting the pull rod 47, when the milling cutter 6 is inserted into the collet 44 during installation, the top of the milling cutter 6 attracts the pull rod 47 under the action of magnetic force, so that the pull rod 47 attracts the milling cutter 6, completing the initial fixation of the milling cutter 6. In addition, the pull rod 47 has an upward pulling force on the milling cutter 6, thereby preventing the milling cutter 6 from shifting downward during the installation process and ensuring the installation stability of the milling cutter 6.

[0067] refer to Figure 6 and Figure 7 In an optional embodiment, the inner locking mechanism 46 includes a plurality of locking rods 461 rotatably connected to the outside of the inner sleeve rod 48. A locking block 462 is fixedly connected to the outer end of the locking rod 461. The locking rod 461 includes a transverse through-slot. A synchronizing ring 463 is movably connected inside the slot of the plurality of locking rods 461. An inner locking groove 432 is opened at the top of the inner sleeve 43. The locking block 462 is engaged inside the inner locking groove 432.

[0068] A spiral spring is provided between the locking rod 461 and the inner sleeve rod 48, and the spiral spring drives the locking rod 461 to tend to flip upward.

[0069] It should be noted that when the inner sleeve 43 is installed, the inner sleeve 43 controls the limiting block 431 to slide down from the top of the outer shaft groove 412. When the limiting block 431 slides to the bottom of the outer shaft groove 412, the inner sleeve 43 is then controlled to rotate laterally so that the inner sleeve 43 slides into the transverse groove 413.

[0070] Furthermore, at this point, a clamp can be installed to engage with the inner wall of the drive shaft 41. The clamp is located above the transverse groove 413 to prevent the inner sleeve 43 from falling off directly through the outer shaft groove 412.

[0071] When the installation of the inner sleeve 43 is completed, the inner sleeve rod 48 is then inserted into the inner sleeve 43, so that the inner sleeve rod 48 is engaged in the inner locking groove 432 of the inner sleeve 43 through the locking rod 461 and the locking block 462.

[0072] Furthermore, the drive shaft 41 is installed at the bottom of the output seat 3 via the connecting flange 5, and the drive shaft 41 and the output end of the output seat 3 are connected in a transmission manner. At the same time, the inner sleeve rod 48 and the inner positioning rod 7 of the output seat 3 are engaged, and the inner sleeve rod 48 can rotate laterally relative to the inner positioning rod 7, while the inner sleeve rod 48 and the inner positioning rod 7 maintain axial position stability.

[0073] It should be noted that the locking block 462 is engaged in the inner locking groove 432, and the supporting pressure plate 452 is engaged in the intermittent groove of the collet 44, so that the collet 44, the inner sleeve rod 48 and the inner clamp 43 have radial limiting, and the collet 44, the inner sleeve rod 48 and the inner clamp 43 can rotate synchronously.

[0074] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-angle milling head for a CNC machining center, comprising a spindle connector, a rotary base, an output base, and a clamping mechanism, wherein the clamping mechanism clamps and fixes a milling cutter, characterized in that: The clamping mechanism includes a drive shaft, and a connecting flange is rotatably connected to the outside of the drive shaft. The connecting flange is used to install the drive shaft to the bottom of the output seat. The clamping mechanism also includes a positioning sleeve, a threaded opening at the bottom of the drive shaft, a positioning sleeve threadedly connected to the outside of the threaded opening, a collet rotatably connected inside the positioning sleeve, an inner clamping sleeve snapped into the inside of the drive shaft, and the inner clamping sleeve sleeved on the outside of the collet. The internal output end of the output base also includes an inner positioning rod, the bottom of which is rotatably connected to an inner sleeve rod, and the outside of the inner sleeve rod is provided with an anti-disengagement mechanism and an inner locking mechanism; The anti-detachment mechanism is used to limit the axial movement of the collet, and the inner locking mechanism is used to limit the radial rotation of the inner sleeve. The inner sleeve is fixedly connected to a limiting block, and the transmission shaft has an outer shaft groove inside. The bottom of the outer shaft groove has a transverse groove, and the limiting block can slide into the outer shaft groove and the transverse groove respectively.

2. A multi-angle milling head for a CNC machining center according to claim 1, characterized in that: The anti-detachment mechanism includes a movable rod that is inserted through the circumference of the inner sleeve rod. A support plate is fixedly connected to the bottom of the movable rod. The support plate includes an elastic connecting strip and a card block. The elastic connecting strip is fixed to the bottom side of the movable rod by screws, and the card block can be inserted into the gap groove of the collet.

3. A multi-angle milling head for a CNC machining center according to claim 2, characterized in that: The movable rods are arranged in several groups and are evenly distributed on the outside of the inner sleeve rod. The movable rods can slide up and down on the outside of the inner sleeve rod, and the top of several movable rods are engaged with connecting rings.

4. A multi-angle milling head for a CNC machining center according to claim 1, characterized in that: The collet is provided with a limiting mechanism inside. The limiting mechanism includes a beveled groove evenly opened on the inner side of the collet, a limiting ball placed inside the beveled groove, and a support ring sleeved on the outside of several limiting balls.

5. A multi-angle milling head for a CNC machining center according to claim 4, characterized in that: The beveled groove is designed in an inverted triangular shape, gradually deepening from bottom to top. The limiting ball moves between the support ring and the beveled groove. The support ring has a circular hole adapted to the limiting ball. The inner diameter of the circular hole is smaller than the diameter of the limiting ball. The spherical surface of the limiting ball can abut against the end mill and the bottom of the beveled groove respectively.

6. A multi-angle milling head for a CNC machining center according to claim 5, characterized in that: The inner side of the collet is also provided with an annular groove adapted to the support ring. The groove depth is greater than the thickness of the support ring, and the groove width is adapted to the height of the inclined groove, so that the support ring can slide axially in the annular groove.

7. A multi-angle milling head for a CNC machining center according to claim 1, characterized in that: The inner sleeve is internally connected to a pull rod, and a tension spring is provided between the pull rod and the inner sleeve. The bottom of the pull rod is provided with a magnetic component, and the pull rod can magnetically adhere to the top of the milling cutter.

8. A multi-angle milling head for a CNC machining center according to claim 1, characterized in that: The inner locking mechanism includes several locking rods rotatably connected to the outside of the inner sleeve rod. A locking block is fixedly connected to the outer end of the locking rod. The locking rod includes a transverse through-slot. A synchronizing ring is movably connected inside the slot of the several locking rods. An inner locking slot is opened at the top of the inner sleeve. The locking block is engaged inside the inner locking slot.

9. A multi-angle milling head for a CNC machining center according to claim 8, characterized in that: A spiral spring is provided between the locking rod and the inner sleeve rod, and the spiral spring drives the locking rod to tend to rotate upward.

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