Three-edge milling cutter convenient to replace

Abstract

The three-edge milling cutter convenient to replace comprises a cutter handle and a cutter head, the cutter head is arranged at the end of the cutter handle, a plurality of cutter grooves are formed in the cutter head and evenly distributed in the peripheral end face of the cutter head at equal intervals in the circumferential direction, a blade is detachably connected into each cutter groove, and a mounting hole is formed in each blade. A first bolt is arranged in the mounting hole, a threaded groove is formed in the inner bottom wall of each cutter groove, and a screw rod part of the first bolt penetrates through the mounting hole and is in threaded connection with the interior of the threaded groove. The effect of reducing the use cost of the milling cutter is achieved.

Description

Technical Field

[0001] This application relates to the field of milling cutter technology, and in particular to a three-sided milling cutter that is easy to replace. Background Technology

[0002] A three-sided end mill, also known simply as a three-sided cutter, has three cutting edges, each with a clearance angle. These edges are sharp, resulting in a smooth and quick cut. Three-sided end mills are standard machine tool cutters, typically used on horizontal milling machines, and are generally used for milling grooves and steps.

[0003] Chinese Patent No. CN209189887U discloses a three-sided end mill, including a tool head, a positioning hole, and a tool body; the positioning hole and the tool head are connected as a whole, and multiple tool bodies are integrally arranged on the tool head. The rear side of the cutting surface facing the cutting direction on the cutting surface of each tool body is a rear cutting surface, and the side side of the cutting surface is a side cutting surface. The cutting surface intersects with the rear cutting surface or the side cutting surface to form at least one cutting edge. At least one inner composite cutting surface is provided on the cutting surface facing the cutting direction.

[0004] However, existing milling cutters use inserts welded to the cutter head body as a single unit. When the inserts wear out severely during long-term operation or break, workers need to replace the entire cutter head, which increases the cost of using the milling cutter and has obvious shortcomings. Utility Model Content

[0005] To reduce the cost of using end mills, this application provides a three-sided end mill that is easy to replace.

[0006] The three-sided end mill provided in this application adopts the following technical solution:

[0007] A replaceable three-sided end mill includes a shank and a cutter head. The cutter head is disposed at the end of the shank. The cutter head has multiple slots, which are evenly distributed circumferentially on the outer peripheral end face of the cutter head. Each slot can be detachably connected to an insert, which is slidably disposed inside the slot. Each insert has a mounting hole, and a first bolt is disposed in the mounting hole. Each slot has a threaded groove on its inner bottom wall, and the bolt portion of the first bolt passes through the mounting hole and is threaded into the threaded groove.

[0008] By adopting the above technical solution, when a cutting tool wears or breaks, the worker can rotate the first bolt at the damaged cutting tool to disengage it from the mounting hole, then remove the damaged cutting tool from the tool slot, place a new cutting tool in the tool slot, and retighten the first bolt in the threaded groove, thereby replacing the damaged cutting tool. This design allows the cutting tool and the cutting head to adopt a separate and detachable structure, so that the worker does not need to replace the entire cutting head after the cutting tool wears out, thus reducing the cost of using the milling cutter.

[0009] Optionally, the cutter head can be detachably connected to the cutter holder via a connecting assembly.

[0010] By adopting the above technical solution, the cutter head and the tool holder are detachably connected through the connecting component, which allows for quick replacement when either the cutter head or the tool holder is worn, avoiding the overall scrapping of an integrated tool due to partial damage, thereby further reducing the cost of use; at the same time, the setting of the connecting component allows for the replacement of the appropriate cutter head model according to different processing requirements, improving the applicability of the tool.

[0011] Optionally, the connecting assembly includes a connecting plate disposed at the center of the cutter head. The surface of the connecting plate is evenly provided with a plurality of connecting holes along the circumference. A second bolt is disposed in each of the connecting holes, and the threaded portions of the plurality of second bolts all pass through the connecting holes and are threadedly engaged with the cutter shank.

[0012] By adopting the above technical solution, when the cutter head or tool holder needs to be replaced, the cutter head and tool holder can be separated simply by removing multiple second bolts. After replacement, the cutter head and tool holder can be connected again by installing multiple second bolts, thus achieving a detachable connection between the cutter head and tool holder.

[0013] Optionally, the connecting assembly includes a connecting post disposed at the center of the cutter head, a connecting groove that slides with the connecting post on the cutter shank, a plug-in block disposed on the outer surface of the connecting post, a guide groove that slides with the plug-in block disposed on the inner sidewall of the connecting groove, an arc groove that communicates with the guide groove disposed on the inner sidewall of the connecting groove, a plug-in groove that slides with the plug-in block disposed on the inner sidewall of the arc groove, a clamping plate that slides inside the connecting groove, and a control assembly disposed inside the connecting groove that drives the clamping plate to press the plug-in block against the plug-in groove.

[0014] By adopting the above technical solution, when it is necessary to connect the cutter head or the tool holder, the user inserts the connecting post into the connecting groove and ensures that the plug block is slidably connected in the guide groove. When the plug block moves to the connection between the guide groove and the arc groove, the user rotates the connecting post to make the plug block slide along the arc groove. When the plug block moves to the connection between the arc groove and the plug groove, the user pulls the cutter head to make the plug block slide into the plug groove. Then, the control component drives the clamping plate to clamp the plug block into the plug groove, thereby realizing the connection between the cutter head and the tool holder.

[0015] During disassembly, the clamping action of the clamping plate is first canceled by the control component. Then, the cutter head is pressed to move the plug block into the arc groove. Next, the cutter head is rotated to move the plug block to the connection point between the arc groove and the guide groove. Finally, the cutter head is pulled outward to disengage the connecting column from the connecting groove, thereby achieving the disassembly of the cutter head and the tool holder. This design simplifies the disassembly and assembly process of the cutter head and the tool holder, eliminating the need for workers to align the bolt connection holes one by one during installation, thus improving the convenience for workers during disassembly and assembly.

[0016] Optionally, the control component includes connecting rods disposed on opposite sides of the connecting groove. Both connecting rods are hinged to the end face of the abutment plate away from the insertion groove. The centers of the two connecting rods are hinged to each other. Adjusting blocks are hinged to the ends of the two connecting rods away from the abutment plate. A bidirectional lead screw is rotatably connected in the connecting groove. The two adjusting blocks are threaded to the two ends of the bidirectional lead screw with opposite thread directions. The end of the bidirectional lead screw extends to the surface of the tool holder and has an internal hexagonal adjustment hole.

[0017] By adopting the above technical solution, when connecting the tool holder and the tool disc, the user rotates the double-acting screw forward with an Allen wrench. The rotation of the double-acting screw causes the two adjusting blocks to move closer to each other. At this time, the angle between the two connecting rods and the double-acting screw increases, and the connecting rods push the clamping plate towards the insertion slot, thereby clamping the insertion block into the insertion slot. When disassembling, the user rotates the double-acting screw in the opposite direction. The double-acting screw causes the two adjusting blocks to move away from each other. The movement of the adjusting blocks pulls the connecting rod to rotate, thereby causing the clamping plate to move away from the insertion slot. At this time, the clamping effect of the clamping plate on the insertion block disappears. The setting of the control component enables the worker to accurately control the clamping state of the clamping plate, which is convenient for the worker to operate.

[0018] Optionally, the tool holder is provided with a clamping groove, and a clamping bolt is threaded into the clamping groove, with the end of the clamping bolt abutting against the outer surface of the bidirectional lead screw.

[0019] By adopting the above technical solution, after the tool holder is connected to the tool disc, the user can rotate the clamping bolt to apply clamping force to the double-acting screw, which effectively prevents the double-acting screw from rotating unexpectedly due to cutting vibration or external impact, thereby ensuring that the clamping force of the clamping plate on the plug block is stable for a long time and ensuring the stability of the connection between the tool disc and the tool holder.

[0020] Optionally, each of the tool slots is provided with a chip removal groove.

[0021] By adopting the above technical solution, the chip removal groove can guide the chips to be discharged in a specific direction during the cutting process, avoiding the problem of chip accumulation in the tool groove or blade gap causing frictional heating or cutting edge adhesion, thereby reducing the risk of abnormal blade wear and extending its service life.

[0022] Optionally, the cutter head is provided with multiple weight-reducing grooves evenly distributed along its circumference.

[0023] By adopting the above technical solution, the weight reduction groove effectively reduces the weight of the cutter head, thereby reducing the power required by the machine tool. At the same time, the removed raw materials can be further processed into other products, further reducing the cost of using the milling cutter.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. This application detachably connects the insert to the cutter head. When an insert wears or breaks, the worker can turn the first bolt at the damaged insert to disengage it from the mounting hole, then remove the damaged insert from the cutter groove, place a new insert in the cutter groove, and retighten the first bolt in the threaded groove, thereby replacing the damaged insert. This design allows the insert and cutter head to adopt a separate and detachable structure, eliminating the need for workers to replace the entire cutter head after the insert wears out, thus reducing the cost of using the milling cutter.

[0026] 2. By setting up a connecting component, the cutter head and the tool holder are detachably connected, which allows for quick replacement when either the cutter head or the tool holder is worn, avoiding the overall scrapping of an integrated tool due to partial damage, thereby further reducing the cost of use; at the same time, the setting of the connecting component allows for the replacement of the appropriate cutter head model according to different processing requirements, improving the applicability of the tool. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application.

[0028] Figure 2 This is an exploded view of the connection column and the tool holder in Embodiment 2 of this application.

[0029] Figure 3 This is a cross-sectional view of the connecting groove in Embodiment 2 of this application.

[0030] Figure 4 This is a cross-sectional view of the clamping plate in Embodiment 2 of this application.

[0031] Figure 5 This is a cross-sectional view of the clamping groove in Embodiment 2 of this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Tool holder; 2. Connecting assembly; 21. Connecting disc; 211. Connecting hole; 22. Second bolt; 23. Connecting post; 24. Insert block; 25. Clamping plate; 3. Tool disc; 31. Weight reduction groove; 4. Tool groove; 41. Thread groove; 42. Chip removal groove; 5. Blade; 51. Mounting hole; 6. First bolt; 7. Connecting groove; 71. Guide groove; 72. Arc groove; 73. Insert groove; 8. Control assembly; 81. Connecting rod; 82. Adjusting block; 83. Two-way lead screw; 831. Internal hexagonal adjustment hole; 9. Clamping groove; 91. Clamping bolt. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0034] This application discloses a three-sided end mill that is easy to replace.

[0035] Example 1

[0036] Reference Figure 1 A replaceable three-sided milling cutter includes a shank 1. The end of the shank 1 is detachably connected to a cutter disc 3 via a connecting component 2. The cutter disc 3 is disc-shaped and has a plurality of weight-reducing grooves 31 evenly distributed along its circumference. In this embodiment, there are six weight-reducing grooves 31, and the cross-section of each of the six weight-reducing grooves 31 is trapezoidal. The weight of the cutter disc 3 is effectively reduced by the six weight-reducing grooves 31, thereby reducing the power provided by the machine tool. At the same time, the removed raw materials can be further processed into other products, reducing the cost of using the milling cutter.

[0037] Reference Figure 1 The cutter head 3 has multiple cutter grooves 4, which are evenly distributed equidistantly along the outer periphery of the cutter head 3. In this embodiment, two adjacent cutter grooves 4 are respectively located on opposite sides of the cutter head 3 in the width direction. Each cutter groove 4 can be detachably connected to a blade 5. The outer surface of the blade 5 slides against the inner sidewall of the cutter groove 4. Each blade 5 has a mounting hole 51, and a first bolt 6 is installed in the mounting hole 51. Each cutter groove 4 has a threaded groove 41 on the bottom wall of the inner sidewall. The screw portion of the first bolt 6 passes through the mounting hole 51 and is threaded into the threaded groove 41. The end of the first bolt 6 presses the blade 5 against the cutter groove 4.

[0038] When a cutting tool 5 becomes worn or breaks, the worker rotates the first bolt 6 at the damaged cutting tool 5 to disengage it from the mounting hole 51. Then, the damaged cutting tool 5 is removed from the tool groove 4. A new cutting tool 5 is then placed in the tool groove 4, ensuring that the mounting hole 51 is aligned with the threaded groove 41. The worker passes the end of the first bolt 6 through the mounting hole 51 and inserts it into the threaded groove 41. Finally, the first bolt 6 is tightened into the threaded groove 41. This completes the replacement of the damaged cutting tool 5. The design of the first bolt 6 allows the cutting tool 5 and the cutter head 3 to adopt a separate and detachable structure. When the cutting tool 5 is worn, the worker does not need to replace the entire cutter head 3, reducing the operating cost of the milling cutter.

[0039] Reference Figure 1 Each tool groove 4 has a chip removal groove 42 on its inner side wall. The chip removal groove 42 can guide the chips to be discharged in a specific direction during the cutting process, thus avoiding chip accumulation.

[0040] Reference Figure 1 The connecting component 2 includes a connecting plate 21 fixedly connected to the center of the cutter head 3. The surface of the connecting plate 21 is evenly provided with multiple connecting holes 211 along the circumference. In this embodiment, there are four connecting holes 211. Each connecting hole 211 is provided with a second bolt 22. The threaded part of the multiple second bolts 22 passes through the connecting hole 211 and is threadedly connected to the cutter handle 1. When the cutter head 3 or the cutter handle 1 needs to be replaced, the cutter head 3 and the cutter handle 1 can be separated by simply removing the multiple second bolts 22. After replacement, the cutter head 3 and the cutter handle 1 can be connected by installing the multiple second bolts 22. This achieves a detachable connection between the cutter head 3 and the cutter handle 1, so that the cutter head 3 or the cutter handle 1 can be quickly replaced when they are worn individually, avoiding the overall scrapping of the integrated cutter due to local damage, thereby further reducing the cost of use.

[0041] The implementation principle of a replaceable three-sided milling cutter according to an embodiment of this application is as follows: When a cutting insert 5 is worn or broken, the worker rotates the first bolt 6 at the damaged cutting insert 5 to disengage it from the mounting hole 51. Then, the damaged cutting insert 5 is removed from the cutter groove 4. Subsequently, a new cutting insert 5 is placed in the cutter groove 4, ensuring that the mounting hole 51 is aligned with the thread groove 41. The worker passes the end of the first bolt 6 through the mounting hole 51 and inserts it into the thread groove 41. Finally, the first bolt 6 is tightened in the thread groove 41. This achieves the replacement of the damaged cutting insert 5. The setting of the first bolt 6 makes the cutting insert 5 and the cutter head 3 adopt a separate and detachable structure. After the cutting insert 5 is worn, the worker does not need to replace the entire cutter head 3, which reduces the use cost of the milling cutter.

[0042] Example 2

[0043] Reference Figure 2 and Figure 3The difference between this embodiment and Embodiment 1 is that the connecting component 2 includes a connecting post 23 fixedly connected to the center of the cutter head 3. The connecting post 23 is coaxially arranged with the cutter handle 1. The cutter handle 1 has a connecting groove 7 that slides with the connecting post 23. The two opposite sides of the outer surface of the connecting post 23 are fixedly connected with plug-in blocks 24. The inner sidewalls opposite to the connecting groove 7 have guide grooves 71 that slide with the two plug-in blocks 24. The guide grooves 71 are parallel to the axial direction of the connecting post 23.

[0044] Reference Figure 2 , Figure 3 and Figure 4 Each guide groove 71 has an arc groove 72 on its inner sidewall that slides with the plug-in block 24. The inner sidewall of the arc groove 72 has a plug-in groove 73 that slides with the plug-in block 24. The center of the plug-in groove 73 is not on the same straight line as the center of the guide groove 71. A pressing plate 25 is slidably connected inside the connecting groove 7. The pressing plate 25 includes an integrally formed circular base plate and two arc-shaped plug-in plates. A limit block (not shown in the figure) is fixedly connected to each arc-shaped plug-in plate. A limiting groove (not shown in the figure) is opened on the inner sidewall of the connecting groove 7 to slide with the limit block. Under the restriction of the limit block and the limiting groove, the pressing plate 25 can only move along the axial direction of the connecting groove 7. A control component 8 is provided in the connecting groove 7 to drive the pressing plate 25 to press the plug-in block 24 against the plug-in groove 73.

[0045] Reference Figure 2 , Figure 3 and Figure 4 The control component 8 includes two connecting rods 81 hinged to the end face of the abutment plate 25 away from the insertion slot 73. The two connecting rods 81 are respectively located on opposite sides of the connecting slot 7. The center of the two connecting rods 81 is hinged to each other. Adjusting blocks 82 are hinged to the ends of the two connecting rods 81 away from the abutment plate 25. A bidirectional lead screw 83 is rotatably connected in the connecting slot 7. The bidirectional lead screw 83 is perpendicular to the axial direction of the connecting column 23. The two adjusting blocks 82 are respectively threaded to the two ends of the bidirectional lead screw 83 with opposite thread directions. The end of the bidirectional lead screw 83 extends to the surface of the tool holder 1 and has an internal hexagonal adjustment hole 831.

[0046] Reference Figure 5 The tool holder 1 has a clamping groove 9, and a clamping bolt 91 is threaded into the clamping groove 9. The end of the clamping bolt 91 abuts against the outer surface of the double-acting screw 83. After the tool holder 1 is connected to the cutter head 3, the user rotates the clamping bolt 91 to apply clamping force to the double-acting screw 83, which effectively prevents the double-acting screw 83 from rotating unexpectedly due to cutting vibration or external impact, thereby ensuring that the clamping force of the clamping plate 25 on the plug block 24 is stable for a long time and ensuring the stability of the connection between the cutter head 3 and the tool holder 1.

[0047] The implementation principle of Example 2 is as follows: When it is necessary to connect the cutter head 3 or the cutter handle 1, the user inserts the plug block 24 into the guide groove 71. The worker pushes the cutter head 3 towards the cutter handle 1 so that the connecting post 23 is inserted into the connecting groove 7. When the plug block 24 moves to the connection point between the guide groove 71 and the arc groove 72, the user rotates the connecting post 23 to make the plug block 24 slide along the arc groove 72. When the plug block 24 moves to the connection point between the arc groove 72 and the plug groove 73, the user pulls the cutter head 3 outward to connect the plug block 24. Block 24 slides into the insertion slot 73. Then, the user rotates the double-acting screw 83 clockwise with an Allen wrench. The rotation of the double-acting screw 83 causes the two adjusting blocks 82 to move toward each other. The movement of the adjusting blocks 82 causes the connecting rod 81 to rotate. The angle between the two connecting rods 81 and the double-acting screw 83 increases. The connecting rod 81 pushes the clamping plate 25 toward the insertion slot 73 until the two insertion blocks 24 are pressed against the insertion slot 73, thereby realizing the connection between the cutter head 3 and the cutter handle 1.

[0048] When disassembly is required, the user rotates the bidirectional lead screw 83 in the opposite direction. The bidirectional lead screw 83 causes the two adjusting blocks 82 to move away from each other, thereby moving the clamping plate 25 away from the insertion groove 73. At this time, the clamping effect of the clamping plate 25 on the insertion block 24 disappears. Then, the cutter head 3 is pressed to move the insertion block 24 into the arc groove 72. Next, the cutter head 3 is rotated to move the insertion block 24 to the connection point between the arc groove 72 and the guide groove 71. Finally, the cutter head 3 is pulled outward to disengage the connecting post 23 from the connecting groove 7, thereby realizing the disassembly of the cutter head 3 and the tool holder 1. This setting simplifies the disassembly and assembly process of the cutter head 3 and the tool holder 1, eliminating the need for workers to align the bolt connection holes 211 one by one during installation, thus improving the convenience for workers during disassembly and assembly.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A three-flank milling cutter for easy replacement, comprising a shank (1) and a disc (3) arranged at the end of the shank (1), characterized in that, A plurality of cutter grooves (4) are formed in the cutter disc (3), and the plurality of cutter grooves (4) are uniformly distributed on the outer circumferential end surface of the cutter disc (3) at equal intervals in the circumferential direction; a cutter blade (5) is detachably connected in each cutter groove (4), and the cutter blade (5) is slidingly arranged in the cutter groove (4); an installation hole (51) is formed in each cutter blade (5); a first bolt (6) is arranged in the installation hole (51); a threaded groove (41) is formed in the bottom wall of each cutter groove (4); and the threaded rod of the first bolt (6) penetrates through the installation hole (51) and is threadedly connected in the threaded groove (41).

2. A replaceable triple wiper cutter according to claim 1 wherein, The cutter disc (3) is detachably connected to the cutter handle (1) through the connecting assembly (2).

3. A replaceable triple wiper cutter according to claim 2 wherein, The connecting assembly (2) comprises a connecting disc (21) arranged at the center of the cutter disc (3), a plurality of connecting holes (211) are uniformly formed on the surface of the connecting disc (21) in the circumferential direction, a second bolt (22) is arranged in each connecting hole (211), and the threaded rods of the plurality of second bolts (22) penetrate through the connecting holes (211) and are threadedly matched with the cutter handle (1).

4. A replaceable triple wiper cutter according to claim 3 wherein, The connecting assembly (2) comprises a connecting column (23) arranged at the center of the cutter disc (3), a connecting groove (7) slidingly matched with the connecting column (23) is formed in the cutter handle (1), an insertion block (24) is arranged on the outer surface of the connecting column (23), a guide groove (71) slidingly matched with the insertion block (24) is formed in the inner side wall of the connecting groove (7), an arc groove (72) in communication with the guide groove (71) is formed in the inner side wall of the connecting groove (7), an insertion groove (73) slidingly matched with the insertion block (24) is formed in the inner side wall of the arc groove (72), a pressing plate (25) is slidingly connected in the connecting groove (7), and a control assembly (8) for driving the pressing plate (25) to press the insertion block (24) in the insertion groove (73) is arranged in the connecting groove (7).

5. A replaceable triple wiper cutter as defined in claim 4 wherein, The control assembly (8) comprises connecting rods (81) arranged on opposite sides of the connecting groove (7), the connecting rods (81) are hingedly connected to the end surface of the pressing plate (25) away from the insertion groove (73), the centers of the two connecting rods (81) are hingedly connected to each other, the end portions of the two connecting rods (81) away from the pressing plate (25) are hingedly connected with adjusting blocks (82), a bidirectional screw rod (83) is rotationally connected in the connecting groove (7), the adjusting blocks (82) are threadedly connected to the two end rods of the bidirectional screw rod (83) with opposite screw rotation directions, and the end portion of the bidirectional screw rod (83) extends to the surface of the cutter handle (1) and is provided with an internal hexagonal adjusting hole (831).

6. A replaceable triple wiper cutter as defined in claim 5 wherein, A pressing groove (9) is formed in the cutter handle (1), a pressing bolt (91) is threadedly connected in the pressing groove (9), and the end portion of the pressing bolt (91) abuts against the outer surface of the bidirectional screw rod (83).

7. A replaceable triple wiper cutter as defined in claim 1 wherein, A chip removal groove (42) is formed in each cutter groove (4).

8. A replaceable triple wiper cutter as defined in claim 1 wherein, A plurality of weight reduction grooves (31) are uniformly formed in the circumferential direction of the cutter disc (3).

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