Combined tool capable of chamfering and milling flat

Abstract

The utility model discloses a combined cutter capable of chamfering and milling flat, which comprises a cutter handle, two cutter heads are arranged on the cutter handle at intervals along the axial direction of the cutter handle, the cutter heads are both coaxial with the cutter handle, and a milling blade for milling flat is fixedly arranged on the excircle of each cutter head. The end face, close to the other cutter head, of each cutter head is fixedly provided with a chamfering blade used for conducting chamfering machining on workpieces at the same time, and the radial distance between each chamfering blade and the cutter handle is smaller than the radial distance between the corresponding milling blade and the cutter handle. In the working process, when the milling blade mills out a flat, the chamfering blade conducts chamfering machining on a workpiece, burrs are removed while chamfering machining is conducted, and therefore flat milling and chamfering machining of the workpiece are completed at a time, and working efficiency is improved. And meanwhile, machined chamfers are more regular, the surfaces of the chamfers are smooth, it can be guaranteed that the chamfers are consistent in size, the chamfers are more attractive, and follow-up assembly work is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of machine tool technology, and in particular to a combination tool that can be chamfer and mill flat. Background Technology

[0002] Currently, the fasteners of high-speed rail braking systems, such as brake lever bolts and the ends of longitudinal rod-like workpieces, are like... Figure 7 The diagram shows a symmetrical flat structure. Currently, this type of symmetrical flat structure is typically machined on a milling machine using a fixed-distance combination tool, which has two facing disc-shaped end mills. After machining, burrs appear on the edges of the two planes of the workpiece, requiring chamfering to remove them. Chamfered workpieces are also easier to install. In particular, double-sided end mills wear down over time, leading to a significant increase in burrs, necessitating replacement to reduce burrs. However, these end mills are usually custom-made, resulting in high replacement costs.

[0003] Currently, deburring and chamfering are done by grinding with a grinding wheel, which is inefficient. Furthermore, since chamfering is a purely manual process, the resulting chamfers are irregular, and the quality is greatly affected by the operator's experience.

[0004] Patent application CN210649699U discloses a general-purpose tooling for double-sided milling of connecting rod ends. Two milling cutters are fastened and limited on the connecting rod, and a fastening and limiting component is used to secure the two cutters, allowing the cutters to mill the flat surface in one pass. However, this process generates burrs on the edges of the flat surface, requiring manual removal of these burrs using a grinding wheel or file. This not only increases the number of processing steps and extends the processing time, but also makes it difficult to guarantee the consistency of the chamfered edges due to the operator's experience. Patent application CN214134182U discloses a special combination tool for milling flat surfaces, which also uses two milling cutters to mill the workpiece simultaneously, thus producing a flat surface in one pass. It also suffers from the same problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a combination tool that can be chamfer and mill flatten the workpiece, so as to solve the problem that the current combination tool still needs to manually chamfer after machining the workpiece flat, resulting in low work efficiency and difficulty in guaranteeing the chamfering quality.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A combination tool for chamfering and milling flattening includes a tool holder, on which two cutter discs are spaced apart along their axial direction. Both cutter discs are coaxial with the tool holder. Milling inserts for milling flattening are fixedly mounted on the outer circumference of each cutter disc. Chamfering inserts for simultaneously chamfering workpieces are fixedly mounted on the end faces of each cutter disc facing each other. The radial distance between the chamfering inserts and the tool holder is smaller than the radial distance between the milling inserts and the tool holder.

[0008] Furthermore, both cutter discs are fitted onto the tool holder, and a positioning sleeve is provided between the two cutter discs. The positioning sleeve is fitted onto the tool holder, and an anti-loosening nut is provided on the outer side of the outer cutter disc, which is screwed onto the outer end of the working part of the tool holder. The anti-loosening nut clamps the positioning sleeve and the two cutter discs along the axial direction of the tool holder.

[0009] Furthermore, the outer end of the working end of the tool holder is screwed with a set screw along the axial direction, and the set screw is pressed against the outside of the anti-loosening nut.

[0010] Furthermore, the milling inserts are double-sided milling inserts, with the milling inserts on both cutter heads extending radially above the outer circle of the cutter head, and the milling inserts on both cutter heads extending axially above the inner end face of the insert.

[0011] Furthermore, the angle of the chamfering insert is consistent with the chamfering angle of the workpiece. The distance between the chamfering insert on one cutter head and the chamfering insert on the other cutter head along the cutter head axis is E, and the distance between the milling insert on one cutter head and the milling insert on the other cutter head along the cutter head axis is F, then E < F.

[0012] Furthermore, the tool holder includes a handle body and a mounting shaft threaded to one end of the handle body. The tool disc and the positioning sleeve are both fitted onto the mounting shaft, and the outer end of the mounting shaft is a flange for radially clamping the positioning sleeve and the two tool discs.

[0013] Furthermore, a disassembly ring is provided between the cutter head and the shank near the shank and is fitted onto the mounting shaft. The disassembly ring includes at least two arc-shaped rings evenly distributed along the circumferential direction, and two adjacent arc-shaped rings are detachably connected.

[0014] Furthermore, the connecting thread between the handle and the mounting shaft is a Whitworth thread, and the rotation direction of the handle is consistent with the tightening direction of the Whitworth thread.

[0015] The positive effects of this utility model are:

[0016] This utility model features a tool holder with two cutter discs spaced axially on it. Each cutter disc has a milling insert fixedly mounted on its outer circumference, and a chamfering insert fixedly mounted on the end face of each cutter disc near the other. While the milling inserts mill the flattened surface, the chamfering inserts simultaneously chamfer the workpiece, removing burrs in the process. This allows for the flattening and chamfering of the workpiece to be completed in one operation, improving work efficiency. Furthermore, the resulting chamfers are more regular, with a smooth surface, ensuring consistent dimensions and a more aesthetically pleasing appearance, facilitating subsequent assembly. Attached Figure Description

[0017] Figure 1 This is the front view of Embodiment 1;

[0018] Figure 2 This is a cross-sectional view of Example 1;

[0019] Figure 3 yes Figure 2 A cross-sectional view of the AA section;

[0020] Figure 4 This is a diagram illustrating the use of this utility model;

[0021] Figure 5 This is a cross-sectional view of Example 2;

[0022] Figure 6 yes Figure 5 A sectional view of the BB section;

[0023] Figure 7 It is a 3D view of the workpiece after processing;

[0024] In the picture:

[0025] 1. Tool holder; 2. Tool head; 3. Key; 4. Locking nut; 5. Milling insert; 6. Positioning sleeve; 7. Chamfering insert; 8. Set screw; 9. Workpiece; 10. Horizontal milling machine; 11. Worktable; 12. Plane; 13. Chamfer; 14. Mounting shaft; 15. Removal ring; 16. Shank body; 17. Arc ring; 18. Notch; 19. Locking screw; 20. Notch. Detailed Implementation

[0026] Figure 7 The image shown is a three-dimensional view of the workpiece 9 after processing. One end of the finished workpiece 9 is flat, and the flat end is composed of two parallel planes 12 that are symmetrical about the axis of the workpiece 9. The outer end of the flat end has two chamfers 13.

[0027] Example 1

[0028] Combination Figures 1 to 3As shown, a combination tool for chamfering and milling flattening includes a tool holder 1. The left part of the tool holder 1 is a Morse taper shank for connecting to the spindle of a milling machine, and the right part of the tool holder 1 is cylindrical. Two circular cutter discs 2 are axially spaced on the right part of the tool holder 1. Both cutter discs 2 are coaxial with the tool holder 1. A milling insert 5 for milling flattening is fixedly mounted on the outer circle of each cutter disc 2. A chamfering insert 7 for simultaneously chamfering workpiece 9 is fixedly mounted on the end face of each cutter disc 2 near the other cutter disc 2. The radial distance between the chamfering insert 7 and the tool holder 1 is less than the radial distance between the milling insert 5 and the tool holder 1.

[0029] Two cutter discs 2 are fitted onto the tool holder 1, and a positioning sleeve 6 is provided between the two cutter discs 2. The positioning sleeve 6 is fitted onto the tool holder 1, and a key 3 is provided on the right side of the tool holder 1. The positioning sleeve 6 and the two cutter discs 2 are connected to the tool holder 1 through the key 3. An anti-loosening nut 4 is provided on the outer side of the outer cutter disc 2, which is screwed onto the outer end of the working part of the tool holder 1. After tightening the anti-loosening nut 4, the anti-loosening nut 4 clamps the positioning sleeve 6 and the two cutter discs 2 along the axial direction of the tool holder 1. The right side of the tool holder 1 is the working end, and a set screw 8 is screwed onto the right end of the tool holder 1 along the axial direction. The right side of the set screw 8 is a disc with a diameter larger than the diameter of the right end of the tool holder 1. After tightening the set screw 8, the set screw 8 is pressed against the outside of the anti-loosening nut 4, thereby preventing the anti-loosening nut 4 from loosening due to vibration during operation, which would cause the cutter disc 2 to loosen and result in unevenness or changes in the spacing of the two planes 12 on the workpiece 9 after processing.

[0030] Combination Figure 4 As shown, the processing procedure of this utility model is described using a horizontal milling machine as an example.

[0031] First, the Morse taper shank at the left end of the tool holder 1 is inserted into the spindle of the horizontal milling machine 10, and the workpiece 9 is clamped in the fixture of the worktable 11. Then, the spindle drives the tool holder 1 to rotate, which in turn drives the two cutter heads 2 to rotate. The worktable 11 moves the workpiece 9 in the horizontal plane in a direction perpendicular to the tool holder 1, performing a feed action. The milling insert 5 flattens the workpiece, while the chamfering insert 7 chamfers the workpiece 9. The chamfering process removes burrs at the same time, thus completing the milling and chamfering of the workpiece in one operation, improving work efficiency. At the same time, the chamfer 13 produced is more regular, and the surface of the chamfer 13 is flat, which can ensure the consistent size of the chamfer 13, making it more aesthetically pleasing and facilitating subsequent assembly work.

[0032] The milling insert 5 is a double-sided milling insert. The milling inserts 5 on both cutter heads 2 are radially higher than the outer circle of the cutter head 2, and the milling inserts 5 on both cutter heads 2 are axially higher than the inner end face of the insert. This ensures that when the milling insert 5 is machining the workpiece 9, the cutter head 2 will not rub against the workpiece 9 due to contact.

[0033] The angle of the chamfering blade 7 is the same as the chamfering angle 13 of the workpiece 9, both being 45 degrees. The distance between the inner end of the chamfering blade 7 on one cutter head 2 and the inner end of the chamfering blade 7 on the other cutter head 2 along the axial direction of the cutter head 2 is E. The distance between the inner end of the milling blade 5 on one cutter head 2 and the inner end of the milling blade 5 on the other cutter head 2 along the axial direction of the cutter head 2 is F. Then, E < F is satisfied. The specific difference can be selected by those skilled in the art based on the size of the chamfering angle 13 on the workpiece 9.

[0034] Example 2

[0035] like Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that:

[0036] The tool holder 1 includes a handle body 16 and a mounting shaft 14 threaded to the right end of the handle body 16. The left end of the handle body 1 is a Morse taper shank. The tool disc 2 and the positioning sleeve 6 are both fitted onto the mounting shaft 14. The right end of the mounting shaft 14 has a flange for radially clamping the positioning sleeve 6 and the two tool discs 2. A hexagonal blind hole is machined at the center of the outer end face of the flange for engaging with an Allen wrench. The positioning sleeves 6 are two stacked together, and the key 3 is provided on the mounting shaft 14.

[0037] The two cutter heads 2 and the two positioning sleeves 6 are placed on the mounting shaft 14, and then the left end of the mounting shaft 14 is screwed onto the right end of the shank 16. Under the action of the flange at the right end of the mounting shaft 14, the two cutter heads 2 and the two positioning sleeves 6 are clamped axially.

[0038] The connecting thread between the shank 16 and the mounting shaft 14 is a Whitworth thread, which provides a more secure and durable connection. A stop is used for positioning between the mounting shaft 14 and the shank 16, ensuring coaxiality after connection. The Whitworth thread is right-handed; viewed from the right end of the mounting shaft 14 towards the left, the cutter head 2 rotates counter-clockwise (i.e., the rotation direction of the shank 16 is consistent with the tightening direction of the Whitworth thread). This ensures that the torque of the cutter head 2 during operation is clockwise (viewed from right to left), guaranteeing that the mounting shaft 14 and the shank 16 remain tightly tightened and will not loosen.

[0039] Additionally, if the flatness of the workpiece 9 being processed becomes smaller, one of the positioning sleeves 6 can be moved to the position between the flange at the right end of the mounting shaft 14 and the corresponding cutter head 2, thereby changing the distance between the two cutter heads 2 so that the distance between the two cutter heads 2 matches the flatness.

[0040] Of course, the number of positioning sleeves 6 can also be increased, thus enabling the processing of flat materials in more sizes.

[0041] Example 3

[0042] Combination Figure 6 As shown, the difference between this embodiment and Embodiment 2 is that:

[0043] A disassembly ring 15 is provided between the cutter head 2 and the shank 16 near the shank 16 and is fitted onto the mounting shaft 14. The disassembly ring 15 includes three arc-shaped rings 17 evenly distributed along the circumferential direction. The three arc-shaped rings 17 surround the mounting shaft 14. Each arc-shaped ring 17 has a notch 18 machined on it using a end mill. A locking screw 19 is provided at the notch 18 and screwed onto the adjacent arc-shaped ring 17, thereby realizing the detachable connection of two adjacent arc-shaped rings 17. The edges of two adjacent arc-shaped rings 17 are also milled with notches 20.

[0044] Because the cutter head 2 experiences very high cutting forces during rotation, and because the mounting shaft 14 and the shank 16 are connected by threads, friction exists between them at the threaded connection point under the cutting force. The threads at the connection point of the mounting shaft 14 and the shank 16 have a certain angle, resulting in even greater pressure and friction, making disassembly of the mounting shaft 14 and the shank 16 difficult. Especially after prolonged use or storage, corrosion may occur at the threaded connection point of the mounting shaft 14 and the shank 16, further complicating the disassembly of the mounting shaft 14.

[0045] After setting the disassembly ring 15, during disassembly, first remove the three locking screws 19, then insert a flathead screwdriver into the notch 20 to easily pry open the three arc-shaped rings 17, and then remove the three arc-shaped rings 17. At this time, the axial force acting on the threads of the mounting shaft 14 and the handle 16 disappears, and after tapping and vibrating the right end of the mounting shaft 14 axially, the mounting shaft 14 can be easily unscrewed.

[0046] The above-described embodiments are detailed and specific, illustrating preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and features of the present utility model, with the aim of enabling those skilled in the art to understand the content of the present utility model and implement it accordingly. However, they are not limited to the present utility model, and the patent scope of the present utility model cannot be limited by this embodiment alone. That is, any equivalent changes or modifications made to the spirit disclosed in the present utility model, without departing from the structure of the present utility model, such as local improvements within the system and modifications or transformations between subsystems, are still within the patent scope of the present utility model.

Claims

1. A combination tool for chamfering and milling flattening, characterized in that, Includes a tool holder (1), on which two cutter discs (2) are spaced apart along their axial direction. Both cutter discs (2) are coaxial with the tool holder (1). Milling inserts (5) for milling flattening are fixedly installed on the outer circle of each cutter disc (2). Chamfering inserts (7) for simultaneously chamfering workpieces (9) are fixedly installed on the end faces of each cutter disc (2) facing each other. The radial distance between the chamfering inserts (7) and the tool holder (1) is less than the radial distance between the milling inserts (5) and the tool holder (1).

2. The combined chamfering and milling tool according to claim 1, characterized in that, Both cutter discs (2) are fitted onto the cutter handle (1). A positioning sleeve (6) is provided between the two cutter discs (2). The positioning sleeve (6) is fitted onto the cutter handle (1). An anti-loosening nut (4) is provided on the outer side of the outer cutter disc (2) and screwed onto the outer end of the working part of the cutter handle (1). The anti-loosening nut (4) clamps the positioning sleeve (6) and the two cutter discs (2) along the axial direction of the cutter handle (1).

3. A combination tool for chamfering and milling flattening according to claim 2, characterized in that, The outer end of the working end of the tool holder (1) is screwed with a set screw (8) along the axial direction, and the set screw (8) is pressed against the outside of the anti-loosening nut (4).

4. A combination tool for chamfering and milling flattening according to claim 1, characterized in that, The milling insert (5) is a double-sided milling insert. The milling inserts (5) on the two cutter heads (2) are both radially higher than the outer circle of the cutter head (2) and axially higher than the inner end face of the insert.

5. A combination tool for chamfering and milling flattening according to claim 1, characterized in that, The angle of the chamfering insert (7) is consistent with the chamfering angle (13) of the workpiece (9). The distance between the chamfering insert (7) on one cutter head (2) and the chamfering insert (7) on the other cutter head (2) along the axial direction of the cutter head (2) is E. The distance between the milling insert (5) on one cutter head (2) and the milling insert (5) on the other cutter head (2) along the axial direction of the cutter head (2) is F. Then E < F is satisfied.

6. A combination tool for chamfering and milling flattening according to claim 1, characterized in that, The tool holder (1) includes a handle body (16) and a mounting shaft (14) threaded to one end of the handle body (16). The tool disc (2) and the positioning sleeve (6) are both fitted on the mounting shaft (14). The outer end of the mounting shaft (14) is a flange for radially clamping the positioning sleeve (6) and the two tool discs (2).

7. A combination tool for chamfering and milling flattening according to claim 6, characterized in that, A disassembly ring (15) is provided between the cutter head (2) near the shank (16) and the shank (16) and is sleeved on the mounting shaft (14). The disassembly ring (15) includes at least two arc-shaped rings (17) evenly distributed in the circumferential direction, and two adjacent arc-shaped rings (17) are detachably connected.

8. A combination tool for chamfering and milling flattening according to claim 6, characterized in that, The connecting thread between the handle (16) and the mounting shaft (14) is a Whitworth thread, and the rotation direction of the handle (16) is consistent with the tightening direction of the Whitworth thread.

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