Angle adjustable milling cutter

Abstract

This invention relates to the field of milling equipment and discloses an angle-adjustable milling cutter, including a chamfering cutter head and chamfering tools circumferentially spaced on the outer ring wall of the chamfering cutter head. An adjustment mechanism is provided on the chamfering cutter head that can simultaneously adjust all the chamfering tools. The adjustment mechanism includes a rotating block with a chamfering tool mounted on one side wall and hinged to the chamfering cutter head on both sides of the other end via a connecting shaft; a drive assembly vertically inserted into the chamfering cutter head that drives all the rotating blocks to flip up or down synchronously as it moves; and a limiting mechanism disposed between the drive assembly and the chamfering cutter head that locks with the chamfering cutter head after the drive assembly moves to a designated position. All the chamfering tools on this milling cutter can be simultaneously and quickly adjusted for chamfering angles, significantly improving its applicability.

Description

Technical Field

[0001] This invention relates to the field of milling equipment, and more particularly to an angle-adjustable milling cutter. Background Technology

[0002] A milling cutter is a rotating cutting tool with one or more cutting teeth used for milling operations. During operation, the cutting teeth sequentially and intermittently remove the excess material from the workpiece. Milling cutters are mainly used on milling machines to machine planes, steps, grooves, shaped surfaces, and cut off workpieces. Some milling cutters can also perform chamfering operations on workpieces.

[0003] Chinese Patent No. CN208961091U discloses a chamfering end mill, including a mounting shaft and a chamfering cutter head fixed coaxially with the mounting shaft. The chamfering cutter head is circumferentially translatably equipped with a chamfering tool. Specifically, a plurality of sliding blocks are arranged at intervals in the circumferential direction of the chamfering cutter head. The sliding blocks can reciprocate along the radial direction of the chamfering cutter head and are fixed with fixing bolts after movement. The chamfering tool can be detachably fixed on the sliding blocks.

[0004] In the above structure, firstly, the chamfering tool cannot adjust the chamfering angle. To increase applicability, the workpiece needs to be held by a fixture to adjust the angle of the workpiece to change the final chamfering angle. Secondly, only one chamfering tool can be adjusted at a time. If there are many chamfering tools on the chamfering tool head, the adjustment will be very time-consuming. Moreover, since the chamfering tools are adjusted independently, it is difficult to guarantee the assembly accuracy between the chamfering tools after adjustment. Summary of the Invention

[0005] This invention addresses the shortcoming of existing chamfering end mills that cannot simultaneously adjust the angles of the chamfering tools by providing an adjustable end mill that can simultaneously adjust the angles of all chamfering tools.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] An angle-adjustable milling cutter includes a chamfering cutter head and chamfering tools circumferentially spaced on the outer ring wall of the chamfering cutter head. An adjustment mechanism is provided on the chamfering cutter head to simultaneously adjust all the chamfering tools. The adjustment mechanism includes a rotating block with a chamfering tool mounted on one side wall and hinged to the chamfering cutter head on both sides of the other end via a connecting shaft, a drive component that is vertically inserted into the chamfering cutter head and drives all the rotating blocks to flip up or down synchronously as they move, and a limiting mechanism provided between the drive component and the chamfering cutter head that locks the drive component to the chamfering cutter head when it moves to a specified position.

[0008] The above scheme involves mounting the chamfering cutter on a rotating block. A drive assembly drives all rotating blocks to rotate synchronously, and a limiting mechanism achieves synchronous limiting. This allows for the synchronous change of the chamfering angle of all chamfering cutters, with consistent angle changes across all cutters. This design is suitable for cutter heads with a large number of chamfering cutters. The advantage of this design is that when chamfering straight strip-shaped workpieces or large-diameter ring-shaped workpieces using this milling cutter, changing the workpiece's chamfering angle does not require changing the workpiece's angle; only the chamfering cutter's angle needs to be changed, reducing the requirements for the fixture structure and control system. Furthermore, each change in chamfering angle... The chamfering angle of this cutting tool can quickly chamfer the opening of blind holes or through holes on workpieces with specific hole diameters (within the chamfering range of the milling cutter after changing the chamfering angle). The specific steps are as follows: the workpiece is kept stationary, and the milling cutter is concentric with the blind hole or through hole of the workpiece and rotates on its own axis. Only a small angle needs to be rotated by the milling cutter (rotation angle = 360° / number of chamfering tools), which can reduce the load distributed on each chamfering tool and extend the service life of the chamfering tools. Conventional milling cutters cannot adjust the chamfering angle and can only be adapted to chamfering of the opening of blind holes or through holes on workpieces within a small range. Therefore, the applicability of this milling cutter is significantly improved.

[0009] Preferably, the drive assembly includes a plurality of drive racks that are vertically inserted and move on the chamfering cutter head and correspond one-to-one with the flipping blocks, a connecting gear that is rotatably disposed on the chamfering cutter head and meshes with the drive racks, and a meshing tooth that is circumferentially disposed around the connecting shaft at the end of the flipping block away from the chamfering cutter and meshes with the connecting gear. Both ends of all drive racks extend beyond both ends of the chamfering cutter head and each end is synchronously fixed to a drive ring.

[0010] Using the above scheme, the reciprocating movement of the drive ring can drive all the drive racks to move synchronously, thereby driving all the connecting gears to rotate synchronously, and finally synchronously adjusting the chamfering angle of all the chamfering tools.

[0011] Preferably, the limiting mechanism includes a central bushing protruding from both ends of the chamfered cutter head, limiting ring grooves recessed along the axial direction of the central bushing on the outer ring wall of the central bushing, and at least two limiting blocks evenly spaced around the circumference of the drive ring on the inner ring wall of the drive ring. The limiting blocks are telescopically arranged and partially extend out of the inner ring wall of the drive ring, and then engage with at least one limiting ring groove. The limiting blocks retract synchronously and are synchronously controlled by a rotary pulling mechanism.

[0012] Using the above scheme, a limiting ring groove is set on the central bushing. The rotation of the rotary pulling mechanism changes the extension and retraction state of the limiting block. When the limiting block is in the retracted state, the limiting block and the limiting ring groove are disengaged, and all the drive racks can move synchronously with the drive ring, thereby adjusting the chamfering angle of the chamfering tool. When the limiting block is in the partially extended state, the limiting block and the limiting ring groove are engaged again, limiting the movement of the drive ring, which in turn limits the movement of the drive rack, further limiting the rotation of the connecting gear, and finally limiting the rotation of the flipping block, which in turn limits the change of the chamfering angle of the chamfering tool.

[0013] Preferably, the rotary traction mechanism includes a mating ring groove recessed on the outer ring wall of the drive ring and concentric with the drive ring, a drive rotating ring that rotates in the mating ring groove, and a pull rope whose two ends are fixedly connected to the limiting block and the drive rotating ring respectively. The limiting block extends and retracts in the receiving groove recessed in the inner ring wall of the drive ring. A first elastic element is provided in the receiving groove to drive the limiting block to be in a partially extended state in the normal state. The drive rotating ring is symmetrically provided with operating blocks to facilitate its rotation.

[0014] Using the above scheme, the drive ring can be rotated by grasping the operating block with both hands, causing the pull rope to wind up in the mating ring groove. The limit block is pulled and retracts, thus disengaging from the limit ring groove. When the operating block is released with both hands, the pull rope is reset under the action of the second elastic element, causing the drive ring to reverse and the limit block to extend partially again and engage with the limit ring groove.

[0015] Preferably, after the drive ring rotates at a certain angle, it is circumferentially locked to the chamfering cutter head by a limiting component and can move along the axial direction of the chamfering cutter head. The limiting component includes a locking bolt, a through hole on the operating block, and several threaded holes evenly spaced around the circumference of the chamfering cutter head. After the locking bolt passes through the through hole, it can align with any one of the threaded holes and achieve a threaded connection as the drive ring rotates.

[0016] Using the above scheme, after the locking bolt is threadedly connected to the threaded hole, the circumferential rotation of the drive ring is limited. At this time, the operator only needs to press or pull the drive ring, without having to grasp the operating block at the same time to prevent the operating block from rotating in reverse due to the elastic force of the first elastic element, making the operation more convenient and labor-saving.

[0017] Preferably, an oil inlet pipe is vertically arranged inside the drive rack. The oil inlet end of the oil inlet pipe is located inside the drive ring and is connected through a connecting loop. Several oil outlet micro-tubes connected to the oil inlet pipe are arranged at intervals along the moving direction of the drive rack on the side of the drive rack facing the connecting gear. An oil storage part connected to the connecting loop is arranged inside the drive ring. As the drive ring rotates or resets, the oil storage part connects to the connecting loop and quantitatively introduces lubricating oil into the connecting loop, or the oil storage part disconnects from the connecting loop and restricts lubricating oil from entering the connecting loop.

[0018] Using the above scheme, the lubricating oil can be quantitatively transferred to the oil inlet pipe by changing the angle of the chamfering tool. After the chamfering tool angle changes, the oil reservoir is closed. During the rapid rotation of the milling cutter, the quantitative lubricating oil pre-positioned in the oil inlet pipe is sprayed out from the oil outlet microtube under the action of centrifugal force, and then splashed onto the rack, connecting gear and meshing teeth, providing pre-lubrication for the next adjustment and avoiding jamming between the three components during the next adjustment.

[0019] Preferably, a follower block is provided on the pull rope to seal and move in conjunction with the receiving groove. The limiting block extends and retracts within the receiving groove. The two ends of the first elastic member elastically abut against the limiting block and the follower block, respectively. The oil storage part is a sealed chamber formed between the limiting block and the follower block. An oil inlet pipe is provided on the connecting loop to communicate with each receiving groove. A second elastic member is provided at the bottom of the receiving groove to drive the follower block to block the oil inlet pipe under normal conditions. When the second elastic member contracts, the limiting block and the follower block are located on both sides of the oil inlet pipe, and the oil storage part is connected to the connecting loop.

[0020] Using the above scheme, under the action of the second elastic element, the follower block is normally in a state of blocking the oil inlet pipe, that is, the lubricating oil in the oil reservoir cannot enter the oil inlet pipe. When the drive ring rotates and the pull rope is wound up, the limit block contracts, causing the follower block and the limit block to contract, and the oil reservoir moves. When the oil inlet pipe is between the limit block and the follower block, the lubricating oil in the oil reservoir will enter the oil inlet pipe. As the follower block contracts to its maximum stroke, the oil reservoir is squeezed, which will give the oil inlet pipe a squeezing force, causing the lubricating oil to enter the connecting loop from the oil inlet pipe and then enter all the oil inlet pipes. When the drive ring is released, the pull rope... The rope resets, the follower block and the limit block reset. Excess lubricating oil and some air will be added to the oil reservoir to ensure that the oil reservoir is kept within a certain volume range. The limit block can engage with the limit ring groove under normal conditions. Preferably, the elastic coefficient of the first elastic element is greater than that of the second elastic element, that is, the reset speed of the limit block is greater than that of the follower block. The advantage is that it can drive air or lubricating oil to be added to the oil reservoir before the follower block plugs the oil inlet pipe, ensuring that the negative pressure of the oil reservoir is not too large and thus affecting the extension stroke of the limit block. A certain negative pressure is a reasonable state and does not affect the fit between the limit block and the limit ring groove.

[0021] Preferably, the drive ring is provided with an oil injection structure for quickly injecting oil into all oil reservoirs. The oil injection structure includes an oil injection pipeline disposed inside the drive ring and connected to adjacent oil reservoirs at both ends, an oil injection pipe section disposed on the end face of the drive ring and connected to an oil injection pipeline, and a sealing member that can open or close the oil injection pipe section.

[0022] Using the above solution, after opening the sealing component, air can be introduced into the oil reservoir without adding lubricating oil. If there is negative pressure in the oil reservoir, it can be immediately restored to normal pressure. Adding lubricating oil can quickly fill each oil reservoir.

[0023] Preferably, the chamfering cutter head is provided with a blocking component to prevent cutting debris from entering the drive rack, connecting gear, or meshing teeth. The blocking component includes a telescopic blocking ring sleeved on the drive rack and fixed at both ends to the drive ring and the chamfering cutter head respectively, and an elastic blocking ring fixed at both ends of the chamfering cutter head. The inner ring of the elastic blocking ring is fixed on the chamfering cutter head and its outer ring extends to completely block the meshing teeth.

[0024] Using the above solution, the telescopic blocking ring can prevent cutting chips from directly hitting the drive rack, and the elastic blocking ring can also greatly reduce the probability of cutting chips entering the meshing teeth and the meshing teeth mating with the connecting gear.

[0025] Preferably, the connecting shaft includes a third elastic element located in the middle and telescopic shaft sections fixed at both ends of the third elastic element. A shaft hole is provided on the flipping block. The two telescopic shaft sections can be simultaneously located in the shaft hole or simultaneously partially extended out of the shaft hole. A blind hole is provided on the chamfering cutter head for the partially extended telescopic shaft sections to be inserted and rotated.

[0026] The above design facilitates the rapid assembly of the flipping block on the chamfering cutter head.

[0027] This invention, employing the above technical solution, possesses significant technical advantages: A chamfering tool is mounted on a rotating block. The meshing teeth on the rotating block engage with a connecting gear, which in turn meshes with a drive rack. The ends of all drive racks are connected to a drive ring. A limiting block, telescopically mounted on the inner wall of the drive ring, engages or disengages with axially distributed limiting ring grooves on the central bushing, thus limiting or unlocking the drive ring. When the drive ring is limited, the rotation of the rotating block relative to the chamfering tool head is restricted, and the chamfering tool angle is not adjustable. When the drive ring is unlocked, it can be manually moved up and down, thereby achieving the up-and-down rotation of the rotating block, and the chamfering tool angle is adjustable. Furthermore, as the limiting block retracts, it can quantitatively deliver lubricating oil to the oil inlet pipe within the telescopic rack. After the limiting block extends and resets, it blocks the output channel of the oil reservoir. When the milling cutter rotates at high speed, the lubricating oil in the oil inlet pipe is subjected to centrifugal force... The oil is ejected from the self-ejecting microtube and sprayed onto the drive rack, connecting gear, and even the meshing teeth, pre-lubricating all three components and facilitating their subsequent engagement. When chamfering straight strip-shaped workpieces or large-diameter ring-shaped workpieces, the chamfering angle can be changed without altering the workpiece angle, reducing the requirements for the workpiece clamping fixture structure and control. Secondly, each change in the chamfering angle of the chamfering tool enables rapid chamfering of blind holes or through holes with specific diameters (within the chamfering range of the chamfering tool after the chamfering angle is changed). The specific steps are as follows: the workpiece remains stationary, and the chamfering tool is concentric with the blind hole or through hole of the workpiece and rotates. Only a small angle of rotation is required for the chamfering tool (rotation angle = 360° / number of chamfering tools), which reduces the load distributed on each chamfering tool and extends their service life. Therefore, the applicability of this chamfering tool is significantly improved. Attached Figure Description

[0028] Figure 1 This is an isometric view of an angle-adjustable milling cutter according to Embodiment 1;

[0029] Figure 2 This is a top view of an angle-adjustable milling cutter according to Embodiment 1;

[0030] Figure 3 yes Figure 2 A sectional view of AA;

[0031] Figure 4 yes Figure 3 A cross-sectional view of BB;

[0032] Figure 5 yes Figure 4 A cross-sectional view of CC;

[0033] Figure 6 This is an isometric view of the flip block and chamfering tool after installation;

[0034] Figure 7 This is an isometric view of the disassembled flip block and chamfering tool;

[0035] Figures 8-9 It is an isometric view of the chamfering cutter head;

[0036] Figure 10 This is a cross-sectional view of an angle-adjustable milling cutter according to Embodiment 2;

[0037] Figure 11 yes Figure 10 A magnified view of A;

[0038] Figure 12 yes Figure 10 A sectional view of DD;

[0039] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Chamfering cutter head; 101. Assembly ring groove; 102. Annular cover; 103. Groove; 104. Through groove; 105. Blind hole; 106. Guide groove; 2. Tilting block; 201. Engaging teeth; 3. Chamfering cutter; 4. Chip removal groove; 5. Central bushing; 501. Limiting ring groove; 6. Drive rotating ring; 7. Operating block; 8. Locking bolt; 9. Telescopic blocking ring; 10. Elastic blocking ring; 11. Thread 12. Hole; 13. Drive ring; 14. Receiving groove; 15. Drive rack; 16. Oil outlet microtube; 17. Connecting gear; 18. Limiting block; 19. Pull rope; 20. First elastic element; 21. Follower plug; 22. Second elastic element; 23. Oil inlet pipe; 24. Connecting loop; 25. Oil source pipe; 26. Sealing element; 27. Oil reservoir; 28. Connecting shaft; 29. ​​Third elastic element; 20. Telescopic shaft section; 21. Set screw. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0041] Example 1

[0042] An angle-adjustable end mill, see reference Figures 1-5 As shown, it includes a chamfering cutter head 1 and 18 chamfering cutters 3 arranged circumferentially on the outer ring wall of the chamfering cutter head 1. The chamfering cutters 3 are diamond-shaped blades. An adjustment mechanism is provided on the chamfering cutter head 1 that can adjust all the chamfering cutters 3 at the same time.

[0043] The adjustment mechanism includes 18 rotating blocks 2. Eighteen grooves 103 are circumferentially recessed on the outer ring wall of the chamfering cutter head 1. The chamfering cutter 3 is detachably locked to the side wall of the rotating block 2 by two set screws 27, and partially extends beyond the end of the rotating block 2 away from the bottom of the groove 103. The two sides of the rotating block 2 are quickly attached to the side walls of the groove 103 via connecting shafts 26 at the ends near the bottom of the groove 103. A chip removal groove 4 is formed between the groove 103 and the chamfering cutter 3. Figures 6-7 As shown, the connecting shaft 26 includes a third elastic element 261 located in the middle and telescopic shaft sections 262 fixed at both ends of the third elastic element 261. The third elastic element 261 is a spring. A shaft hole is provided on the flip block 2. The two telescopic shaft sections 262 can be simultaneously located in the shaft hole or simultaneously partially extended out of the shaft hole. Blind holes 105 are symmetrically recessed on both sides of the groove 103, allowing the partially extended telescopic shaft sections 262 to be inserted and rotated.

[0044] The synchronous flipping of all flipping blocks 2 is controlled by a drive component, combined with Figures 8-9 As shown, the drive assembly includes drive racks 13 in number and corresponding to the number of flipping blocks 2. One end of the chamfering cutter head 1 has a mounting ring groove 101 recessed concentrically with the shaft. An annular cover 102 is detachably fixed to the mounting ring groove 101 by screws. The bottom of the mounting ring groove 101 and the annular cover 102 are respectively provided with guide grooves 106 for the drive racks 13 to be vertically guided through. A through groove 104 communicating with the mounting ring groove 101 is provided at the bottom of the groove 103. A connecting gear 14 that meshes with the drive rack 13 is rotatably arranged in the through groove 104. The assembly method of the connecting gear 14 is the same as that of the flipping blocks 2. The flipping block 2 has a meshing tooth 201 that meshes with the connecting gear 14 at one end near the connecting gear 14 with the connecting shaft 26 as the center. Both ends of the drive rack 13 extend beyond the two ends of the chamfering cutter head 1 and each end is synchronously fixed to a drive ring 12 that is concentrically arranged with the chamfering cutter head 1.

[0045] The chamfering cutter head 1 has a central bushing 5 protruding at both ends. A limiting mechanism is provided between the drive ring 12 and the central bushing 5 to limit the relative movement of the two when the drive ring 12 moves back and forth along the axial direction of the central bushing 5 for a certain distance. The limiting mechanism includes a limiting ring groove 501 recessed along the axial direction of the central bushing 5 on the outer ring wall of the central bushing 5 and at least two limiting blocks 15 evenly spaced around the circumference of the drive ring 12 on the inner ring wall of the drive ring 12. In this embodiment, eight limiting blocks 15 are provided. Eight receiving grooves 121 are recessed circumferentially on the inner ring wall of the drive ring 12. The limiting blocks 15 are telescopically disposed in the receiving grooves 121. A first elastic element 17 is provided in the receiving grooves 121 to drive the limiting blocks 15 to partially extend and engage with at least one limiting ring groove 501. The first elastic element 17 is a spring. The synchronous contraction of the limiting blocks 15 is controlled by a rotary pulling mechanism.

[0046] Combination Figure 2 and Figure 5 As shown, the rotary pulling mechanism includes a mating ring groove concentric with the drive ring 12, a drive rotating ring 6 rotating within the mating ring groove, and a pull rope 16 fixedly connected at both ends to the limiting block 15 and the drive rotating ring 6, respectively. Operating blocks 7 are symmetrically arranged on the drive ring 12 to facilitate its rotation. After rotating a certain angle, the drive rotating ring 6 is circumferentially locked to the chamfering cutter head 1 by the limiting component and can move along the axial direction of the chamfering cutter head 1. The limiting component includes a locking bolt 8, a through hole on the operating block 7, and a plurality of threaded holes 11 evenly spaced around the circumference of the chamfering cutter head 1. In this embodiment, 20 threaded holes 11 are provided. After the locking bolt 8 passes through the through hole, it can align with any one of the threaded holes 11 and achieve a tight fit as the drive ring 12 rotates.

[0047] The chamfering cutter head 1 is provided with a blocking component to prevent cutting debris from entering the drive rack 13, the connecting gear 14, or the meshing teeth 201. See Figure 1 As shown, the blocking component includes a telescopic blocking ring 9 sleeved on the drive rack 13 and fixed at both ends to the drive ring 12 and the chamfering cutter head 1 respectively, and an elastic blocking ring 10 fixed at both ends of the chamfering cutter head 1. The inner ring of the elastic blocking ring 10 is fixed on the chamfering cutter head 1 and its outer ring extends to completely block the biting teeth 201. The telescopic blocking ring 9 is an elastic rubber sleeve and the elastic blocking ring 10 is an elastic rubber ring.

[0048] When adjusting the angle of the chamfering tool 3, first release the locking bolt 8 from the chamfering tool disc 1. Then, grasp the operating block 7 or the locking bolt 8 (for easier application) and rotate the drive ring 6 to retract the limit block 15 until it disengages from the limit ring groove 501. Tightly engage the locking bolt 8 with the corresponding threaded hole 11 to limit the circumferential rotation of the drive ring 6. Next, reciprocate the drive ring 12, observing the change in the angle of the chamfering tool cutting surface while moving it. Measure the angle using a measuring ruler. Once the desired angle is achieved, keep the drive ring stationary and quickly release the locking bolt 8 from the chamfering tool disc 1, allowing the limit block 15 to partially extend and engage with the limit ring groove 501. This completes the angle adjustment. Finally, tighten the locking bolt 8 with the corresponding threaded hole 11.

[0049] Example 2

[0050] Based on Example 1, see Figures 10-12As shown, an oil inlet pipe 20 is vertically arranged inside the drive rack 13. The oil inlet end of the oil inlet pipe 20 is located inside the drive ring 12 and is connected through a connecting loop 21. The connecting loop 21 is concentrically arranged with the drive ring 12. On the side of the drive rack 13 facing the connecting gear 14, a plurality of oil outlet microtubes 1301 connected to the oil inlet pipe 20 are arranged at intervals along the moving direction of the drive rack 13. A follower block 18 that seals and moves with the receiving groove 121 is sealed on the pull rope 16. The limiting block 15 extends and retracts in the receiving groove 12. Inside 1, the two ends of the first elastic member 17 elastically abut against the limiting block 15 and the follower block 18 respectively. The sealed chamber between the limiting block 15 and the follower block 18 forms a movable oil storage part 25. An oil inlet pipe 22 connected to each receiving groove 121 is provided on the connecting loop 21. A second elastic member 19 is provided at the bottom of the receiving groove 121, which drives the follower block 18 to block the oil inlet pipe 22 under normal conditions. The second elastic member 19 is a spring, and the elastic coefficient of the second elastic member 19 is less than the elastic coefficient of the first elastic member 17.

[0051] When the drive ring 12 rotates, the first elastic element 17 and the second elastic element 19 are both in their normal state, the follower block 18 is in the state of blocking the oil inlet pipe 22, and the limit block 15 is in the state of partially extending and engaging with the limit ring groove 501. When the drive ring 12 rotates, the second elastic element 19 contracts before the first elastic element 17, so that the oil storage part 25 is connected to the oil inlet pipe 22. As the first elastic element 17 contracts, the lubricating oil in the oil storage part 25 is squeezed into the oil inlet pipe 22 and then enters the connecting loop 21 and the oil inlet pipe 20 in sequence. When the drive ring 6 is reversed and reset, the first elastic element 17 resets before the second elastic element 19, and draws some lubricating oil or air back into the oil storage part 25 to balance the internal pressure (so that the negative pressure is not too large). Subsequently, the second elastic element 19 resets, the follower block 18 blocks the oil inlet pipe 22 again, and the limit block 15 is still in the state of partially extending and engaging with the limit ring groove 501.

[0052] An oil injection structure is provided on the drive ring 12 for quickly injecting oil into all oil reservoirs 25. The oil injection structure includes an oil injection pipe 24 disposed inside the drive ring 12 and connected to the adjacent oil reservoirs 25 at both ends, an oil injection pipe section disposed on the end face of the drive ring 12 and connected to an oil injection pipe 24, and a sealing member 23 that can open or close the oil injection pipe section. The sealing member 23 is an elastic plug or a plug cap that can be threaded and sealed on the oil injection pipe section. The oil injection structure can not only add lubricating oil, but also balance the air pressure in the oil reservoirs 25.

[0053] As the limit block 15 extends and retracts, the oil reservoir 25 can output a quantitative amount of lubricating oil. After the chamfering tool 3 is adjusted, a small amount of lubricating oil is reserved in the oil inlet pipe 20. When the milling cutter rotates at high speed, this part of the lubricating oil can be sprayed onto the drive rack 13, the connecting gear 14 and the meshing teeth 201, so as to lubricate in advance for the next engagement and avoid excessive loss of lubricating oil, thus saving lubricating oil.

[0054] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An angle-adjustable milling cutter, comprising a chamfering cutter head (1) and chamfering tools (3) circumferentially spaced on the outer ring wall of the chamfering cutter head (1), characterized in that: An adjustment mechanism is provided on the chamfering cutter head (1) that can simultaneously adjust all chamfering cutters (3). The adjustment mechanism includes a flipping block (2) with a chamfering cutter (3) installed on one side wall and the other two sides hinged to the chamfering cutter head (1) via a connecting shaft (26), a drive component that is vertically inserted on the chamfering cutter head (1) and drives all flipping blocks (2) to flip up or down synchronously as it moves, and a limit mechanism that is set between the drive component and the chamfering cutter head (1) and locks the drive component to the chamfering cutter head (1) after it moves to a specified position. The drive assembly includes several drive racks (13) that are vertically inserted and move on the chamfering cutter head (1) and correspond one-to-one with the flipping block (2). The two ends of all drive racks (13) extend beyond the two ends of the chamfering cutter head (1) and each end is synchronously fixed on a drive ring (12). The limiting mechanism includes a central bushing (5) protruding from the center of both ends of the chamfered cutter head (1), a limiting ring groove (501) recessed along the axial direction of the central bushing (5) on the outer ring wall of the central bushing (5), and at least two limiting blocks (15) evenly spaced around the inner ring wall of the drive ring (12). The limiting blocks (15) are telescopically arranged and partially extend out of the inner ring wall of the drive ring (12) and engage with at least one limiting ring groove (501). The limiting blocks (15) retract synchronously and are synchronously controlled by a rotary pulling mechanism. The rotary traction mechanism includes a mating ring groove concentric with the drive ring (12) recessed on the outer ring wall of the drive ring (12), a drive ring (6) rotating in the mating ring groove, and a pull rope (16) fixedly connected at both ends to the limiting block (15) and the drive ring (6) respectively. The limiting block (15) extends and retracts in the receiving groove (121) recessed in the inner ring wall of the drive ring (12). A first elastic element (17) is provided in the receiving groove (121) to drive the limiting block (15) to be in a partially extended state in the normal state. The drive ring (6) is symmetrically provided with operating blocks (7) to facilitate its rotation.

2. The adjustable-angle milling cutter according to claim 1, characterized in that: The drive assembly includes a connecting gear (14) rotatably mounted on the chamfering cutter head (1) and meshing with the drive rack (13), and a meshing tooth (201) circumferentially mounted around the connecting shaft (26) at the end of the flipping block (2) away from the chamfering cutter (3) and meshing with the connecting gear (14).

3. The adjustable-angle milling cutter according to claim 1, characterized in that: After the drive ring (6) rotates a certain angle, it is circumferentially locked to the chamfering cutter head (1) by the limiting component and can move along the axial direction of the chamfering cutter head (1). The limiting component includes a locking bolt (8), a through hole is provided on the operating block (7), and several threaded holes (11) are evenly spaced around the chamfering cutter head (1) in the circumference. After the locking bolt (8) passes through the through hole, it can be aligned with any one of the threaded holes (11) and achieve threaded connection as the drive ring (12) rotates.

4. The adjustable-angle milling cutter according to claim 1, characterized in that: An oil inlet pipe (20) is vertically arranged inside the drive rack (13). The oil inlet end of the oil inlet pipe (20) is located inside the drive ring (12) and is connected through a connecting loop (21). Several oil outlet microtubes (1301) connected to the oil inlet pipe (20) are arranged at intervals along the moving direction of the drive rack (13) on the side of the drive rack (13) facing the connecting gear (14). An oil storage part (25) connected to the connecting loop (21) is arranged inside the drive ring (12). As the drive ring (12) rotates or resets, the oil storage part (25) connects to the connecting loop (21) and quantitatively introduces lubricating oil into the connecting loop (21), or the oil storage part (25) disconnects from the connecting loop (21) and restricts the lubricating oil from entering the connecting loop (21).

5. The adjustable-angle milling cutter according to claim 4, characterized in that: A follower block (18) is sealed on the pull rope (16) and moves in a sealed manner with the receiving groove (121). The limiting block (15) extends and retracts in the receiving groove (121). The two ends of the first elastic member (17) elastically abut against the limiting block (15) and the follower block (18) respectively. The oil storage part (25) is a sealed chamber formed between the limiting block (15) and the follower block (18). An oil inlet pipe (22) is provided on the connecting loop (21) and communicates with each receiving groove (121). A second elastic member (19) is provided at the bottom of the receiving groove (121) to drive the follower block (18) to block the oil inlet pipe (22) in normal state. When the second elastic member (19) contracts, the limiting block (15) and the follower block are located on both sides of the oil inlet pipe (22), and the oil storage part (25) communicates with the connecting loop (21).

6. The adjustable-angle milling cutter according to claim 5, characterized in that: An oil injection structure is provided on the drive ring (12) for quickly injecting oil into all oil storage sections (25). The oil injection structure includes an oil injection pipeline (24) provided in the drive ring (12) and connected to the adjacent oil storage sections (25) at both ends, an oil injection pipe section provided on the end face of the drive ring (12) and connected to an oil injection pipeline (24), and a sealing member (23) that can open or close the oil injection pipe section.

7. The adjustable-angle milling cutter according to claim 1, characterized in that: A blocking component is provided on the chamfering cutter head (1) to prevent cutting debris from entering the drive rack (13), the connecting gear (14), or the meshing teeth (201). The blocking component includes a telescopic blocking ring (9) sleeved on the drive rack (13) and fixed at both ends to the drive ring (12) and the chamfering cutter head (1) respectively, and an elastic blocking ring (10) fixed at both ends of the chamfering cutter head (1). The inner ring of the elastic blocking ring (10) is fixed on the chamfering cutter head (1) and its outer ring extends to completely block the meshing teeth (201).

8. The adjustable-angle milling cutter according to claim 1, characterized in that: The connecting shaft (26) includes a third elastic element (261) located in the middle and telescopic shaft sections (262) fixed at both ends of the third elastic element (261). A shaft hole is provided on the flip block (2). The two telescopic shaft sections (262) can be simultaneously located in the shaft hole or simultaneously partially extended out of the shaft hole. A blind hole (105) is provided on the chamfering cutter head (1) for the partially extended telescopic shaft sections (262) to be inserted and rotated.

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