Tool bit and tool comprising same

Abstract

The utility model discloses a tool bit and a tool comprising the tool bit, the tool bit comprises a tool bit body, the tool bit body is provided with a first positioning hole, a second positioning hole, a first positioning inclined plane located below the first positioning hole, and a second positioning inclined plane located below the second positioning hole; a first flat face is arranged on one side of the tool bit body, a second flat face is arranged on the other side of the tool bit body, a first arc-shaped groove is formed in one side of the first flat face, a second arc-shaped groove is formed in one side of the second flat face, the first positioning hole penetrates through the first flat face and the second arc-shaped groove, and the second positioning hole penetrates through the second flat face and the first arc-shaped groove. The tool bit is fixed to the tool bar through the two screws, the loosening phenomenon is avoided, locking is firm, each positioning hole and each threaded hole can be matched and aligned in each time of installation, and the repeated positioning precision of the tool bit is high; and the tool bit can realize V-shaped included angle positioning, the positioning is firm and reliable, and the position deviation of the tool bit cannot be caused.

Description

Technical Field

[0001] This utility model relates to a cutting head and a cutting tool containing the cutting head, belonging to the field of machining cutting tool technology. Background Technology

[0002] Traditional drill bits and end mills are typically made of high-speed steel or cemented carbide. High-speed steel drill bits and end mills have low machining accuracy, short lifespan, and low efficiency. Cemented carbide, composed of precious metals such as tungsten and cobalt, as well as trace amounts of rare elements, is non-renewable. Due to the high cost of solid cemented carbide drill bits and end mills, which require a large amount of cemented carbide, they are expensive to manufacture and have low economic value, thus limiting their application.

[0003] Existing technologies have designed replaceable drill bits and end mills, solving problems such as high costs and offering a significant price advantage. Replaceable drill bits and end mills typically consist of a carbide tip and a steel shank, greatly reducing costs; however, they also generally suffer from the following problems:

[0004] Some tool holders that rely on deformation clamping require replacement every 10-20 times the tool head is replaced. The high temperatures and loads during machining can cause them to reach their fatigue life limit prematurely, resulting in loose tool head clamping and affecting machining accuracy, service life, and machining stability. Failure to replace the tool holder in time can lead to breakage during machining, damaging parts and, in severe cases, damaging the machine tool spindle, causing very serious consequences. Other tool holders, while providing reliable clamping, rely on interference fits. These tool holders not only have higher manufacturing requirements and are more difficult to manufacture, but also make tool head replacement inconvenient. More importantly, the steel tool holders for replaceable drill bits and end mills are currently separate and not interchangeable.

[0005] Chinese patent document CN114131084A discloses a multifunctional tool holder, which has a mounting groove with a flat bottom surface for mounting a tool head, and the tool holder has a threaded hole. (See appendix to the specification.) Figure 4 It can be seen that the cutting head has a through hole, and the cutting head is installed in the mounting groove by a screw passing through the through hole and the threaded hole of the cutting shank.

[0006] However, in practical applications, the following problems were found when the cutter head was installed in the mounting slot via a screw passing through its threaded hole: 1. Because the cutter head only has one through hole and the cutter shank only has one threaded hole corresponding to the through hole of the cutter head, the cutter head is fixed to the cutter shank by only one screw, which sometimes results in loosening and insecure locking. Furthermore, each time the cutter head's through hole is aligned with the cutter shank's threaded hole, the repeatability of the cutter head's positioning is low, making assembly and disassembly inconvenient. 2. Because the bottom surface of the mounting slot is flat, positioning with the bottom surface of the cutter head is prone to insecure positioning and can easily cause the cutter head's position to shift, affecting the assembly efficiency of the cutter head and cutter shank. Utility Model Content

[0007] To solve the above problems, this utility model provides a cutting head and a cutting tool containing the cutting head. The cutting head is fixed to the cutting rod by two screws to prevent loosening and ensure a firm lock. Each time it is installed, each positioning hole and each threaded hole can be matched and aligned, resulting in high repeatability of the cutting head. Furthermore, the cutting head can achieve V-shaped angle positioning, which is firm and reliable and will not cause the cutting head position to shift.

[0008] On one hand, this utility model provides a cutting head, including a cutting head body, wherein the cutting head body is provided with a first positioning hole, a second positioning hole, a first positioning inclined surface located below the first positioning hole, and a second positioning inclined surface located below the second positioning hole; a first flat surface is provided on one side of the cutting head body, and a second flat surface is provided on the other side; a first arc-shaped groove is provided on one side of the first flat surface, and a second arc-shaped groove is provided on one side of the second flat surface; the first positioning hole passes through the first flat surface and the second arc-shaped groove, and the second positioning hole passes through the second flat surface and the first arc-shaped groove.

[0009] In one embodiment of this utility model, the first positioning inclined surface and the second positioning inclined surface form a "V" shaped structure, and the bottom of the cutter head body is provided with a bottom surface, and the first positioning inclined surface and the second positioning inclined surface extend to the bottom surface.

[0010] In one embodiment of this utility model, the bottom surface is provided with a groove.

[0011] In one embodiment of this utility model, a blade tip is provided at the top of the blade body.

[0012] In one embodiment of this utility model, the first positioning hole and the second positioning hole, the first flat surface and the second flat surface, and the first arc-shaped groove and the second arc-shaped groove are all arranged in a centrally symmetrical manner about the central axis between the blade tip and the bottom surface.

[0013] In one embodiment of this utility model, both the first positioning hole and the second positioning hole are countersunk holes. The center distance between the first positioning hole and the second positioning hole is defined as A, the diameter of the cutter body is D, the height of the cutter body is H, and the thickness of the cutter body is W, satisfying the following relationship:

[0014] 40%D≤A≤60%D;

[0015] 60%D≤H≤80%D;

[0016] 30%D≤W≤50%D.

[0017] On the other hand, this utility model provides a cutting tool, including a tool shank and a cutting head. The tool shank includes a clamping handle and a cutting body disposed on one side of the clamping handle. The top of the cutting body is provided with a mounting groove, and both sides of the mounting groove are provided with fixing blocks. Each fixing block is provided with a threaded hole. The two threaded holes correspond to the first positioning hole and the second positioning hole, respectively. The cutting head body is installed in the mounting groove by screws passing through the two threaded holes, the first positioning hole and the second positioning hole, and abuts against the fixing blocks.

[0018] In one embodiment of this utility model, the clamping handle is a cylindrical handle or a side-fixed handle, and the interior of the clamping handle and the blade body is provided with a through central hole. The axis of the clamping handle is the same as that of the blade body. Two spiral grooves are formed on the surface of the blade body.

[0019] In one embodiment of this utility model, the mounting groove includes a bottom surface of the mounting groove and inclined surfaces located on both sides of the bottom surface of the mounting groove. The bottom surface of the mounting groove is perpendicular to the axis of the blade body. The fixing block has a positioning surface on the side near the mounting groove. The two positioning surfaces abut against the first flat surface and the second flat surface, respectively. The two inclined surfaces abut against the first positioning inclined surface and the second positioning inclined surface, respectively.

[0020] In one embodiment of this utility model, there are two fixing blocks 25 and two positioning surfaces. The two positioning surfaces are parallel to each other, and the distance between the two positioning surfaces is equal to the width of the mounting groove. The width of the groove is 0.2 to 0.5 times the diameter of the blade body, and the depth of the mounting groove is 0.3 to 0.5 times the diameter of the blade body.

[0021] The beneficial effects of this utility model are as follows:

[0022] The cutting head provided by this utility model has two positioning holes, and the cutting shank has two threaded holes corresponding to the two positioning holes of the cutting head. Two screws are passed through the two threaded holes and locked into the two positioning holes, so that the cutting head is fixed to the cutting shank by the two screws, preventing loosening and ensuring a firm lock. Moreover, each positioning hole and each threaded hole can be matched and aligned during each installation, resulting in high repeatability of the cutting head's positioning and convenient assembly and disassembly. In addition, when the cutting head is installed on the cutting shank, the two "V"-shaped positioning bevels at the bottom of the cutting head abut against the two bevels of the cutting shank, so that the cutting head can achieve V-shaped angle positioning, which is firm and reliable and will not cause the cutting head to shift position. Furthermore, each positioning bevel of the cutting head can be matched with each bevel of the cutting shank, making assembly quick and convenient and ensuring the assembly efficiency of the cutting head and cutting shank. Attached Figure Description

[0023] Figure 1 A perspective view of the blade provided by this utility model.

[0024] Figure 2 This is a three-dimensional view of the blade provided by this utility model.

[0025] Figure 3 The front view of the blade provided by this utility model.

[0026] Figure 4 A side view of the blade provided by this utility model.

[0027] Figure 5 A top view of the blade provided by this utility model.

[0028] Figure 6 A perspective view of the tool holder provided for this utility model.

[0029] Figure 7 The front view of the tool holder provided by this utility model.

[0030] Figure 8 A side view of the tool holder provided by this utility model.

[0031] Figure 9 A perspective view of the cutting tool provided by this utility model.

[0032] In the figure: 1. Cutter head body; 11. First positioning hole; 12. Second positioning hole; 13. First positioning inclined surface; 14. Second positioning inclined surface; 15. Bottom surface; 16. Groove; 17. Cutter tip; 18. First flat surface; 181. First arc groove; 19. Second flat surface; 191. Second arc groove; 2. Cutter shank; 21. Clamping handle; 22. Cutter body; 23. Spiral groove; 24. Inclined surface; 25. Fixing block; 251. Positioning surface; 26. Bottom surface of mounting groove; 27. Center hole; 28. Threaded hole; 29. ​​Mounting groove. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] Please see Figures 1 to 5 As shown, this utility model provides a cutting head, including a cutting head body 1. The cutting head body 1 is provided with a first positioning hole 11, a second positioning hole 12, a first positioning inclined surface 13 located below the first positioning hole 11, and a second positioning inclined surface 14 located below the second positioning hole 12. A first flat surface 18 is provided on one side of the cutting head body 1, and a second flat surface 19 is provided on the other side. A first arc-shaped groove 181 is provided on one side of the first flat surface 18, and a second arc-shaped groove 191 is provided on one side of the second flat surface 19. The first positioning hole 11 passes through the first flat surface 18 and the second arc-shaped groove 191, and the second positioning hole 12 passes through the second flat surface 19 and the first arc-shaped groove 181.

[0037] In some embodiments, the first positioning inclined surface 13 and the second positioning inclined surface 14 form a "V" shaped structure, and the bottom of the cutter head body 1 is provided with a bottom surface 15, and the first positioning inclined surface 13 and the second positioning inclined surface 14 extend to the bottom surface 15.

[0038] Furthermore, the bottom surface 15 is provided with a groove 16.

[0039] In some embodiments, a blade tip 17 is provided on the top of the blade body 1.

[0040] Optionally, the first positioning hole 11 and the second positioning hole 12, the first flat surface 18 and the second flat surface 19, and the first arc groove 181 and the second arc groove 191 are all arranged in a centrally symmetrical manner about the central axis between the blade tip 17 and the bottom surface 15.

[0041] Optionally, both the first positioning hole 11 and the second positioning hole 12 are countersunk holes. The center distance between the first positioning hole 11 and the second positioning hole 12 is defined as A, the diameter of the cutter body 1 as D, the height of the cutter body 1 as H, the thickness of the cutter body 1 as W, the distance from the center of the positioning hole to the nearest drill tip as X, and the distance from the center of the positioning hole to the nearest positioning inclined surface as Y, satisfying the following relationship:

[0042] 40%D≤A≤60%D;

[0043] 60%D≤H≤80%D;

[0044] 30%D≤W≤50%D;

[0045] 1.0Y≤X≤1.5Y;

[0046] The dimensions of the countersunk hole are φ2.0~φ7.0;

[0047] The dimensions of the recessed platform are φ2.5~φ8.0;

[0048] The sinking depth Z satisfies: 10%W≤Z≤40%W.

[0049] Please see Figures 6 to 9 As shown, this utility model also provides a cutting tool, which includes a shank 2 and a cutting head. The shank 2 includes a clamping handle 21 and a cutting body 22 disposed on one side of the clamping handle 21. The clamping handle 21 is a cylindrical handle or a side-fixed handle. The clamping handle 21 and the cutting body 22 are provided with a through central hole 27. The axis of the clamping handle 21 and the cutting body 22 is the same.

[0050] In some embodiments, the blade body 22 has two spiral grooves 23 on its surface and a mounting groove 29 at its top. Both sides of the mounting groove 29 are provided with fixing blocks 25. Each fixing block 25 has a threaded hole 28. The two threaded holes 28 correspond to the first positioning hole 11 and the second positioning hole 12, respectively. The blade head body 1 is installed in the mounting groove 29 by screws passing through the two threaded holes 28, the first positioning hole 11 and the second positioning hole 12, and abuts against the fixing blocks 25.

[0051] In some embodiments, the mounting groove 29 includes a mounting groove bottom surface 26 and inclined surfaces 24 located on both sides of the mounting groove bottom surface 26. The mounting groove bottom surface 26 is perpendicular to the axis of the blade body 22. The fixing block 25 is provided with a positioning surface 251 on the side near the mounting groove 29. The two positioning surfaces 251 abut against the first flat surface 18 and the second flat surface 19, respectively. The two inclined surfaces 24 abut against the first positioning inclined surface 13 and the second positioning inclined surface 14, respectively.

[0052] Furthermore, the spiral angle of the spiral groove 23 facing one end of the clamping handle 21 is 0° to 20°; the other end of the spiral groove 23 extends to the mounting groove 29 and intersects with the positioning surface 251. During the cutting process, the movement direction of the chips in the spiral groove 23 changes, making it easier for the chips to break and be discharged.

[0053] Furthermore, there are two fixing blocks 25 and two positioning surfaces 251. The two positioning surfaces 251 are parallel to each other, and the distance between the two positioning surfaces 251 is equal to the width of the mounting groove 29. The width of the groove is 0.2 to 0.5 times the diameter of the blade body 22, and the depth of the mounting groove 29 is 0.3 to 0.5 times the diameter of the blade body 22.

[0054] Furthermore, the two threaded holes 8 respectively penetrate the two fixing blocks 25, and the axis of the threaded holes 8 is parallel to the bottom surface 26 of the mounting groove.

[0055] Furthermore, the diameter of the cutter body 22 is between 12 mm and 52 mm. For cutter shanks smaller than 12 mm, the manufacturing cost increases, and they have no advantage compared to solid carbide cutters. For cutter shanks larger than 52 mm, the cutter head mounted on the shank becomes more expensive with a larger diameter, losing its economic value and being replaced by some modular cutters.

[0056] In some embodiments, the cutting head is adapted to the mounting groove 29 of the cutting shank 2, and the cutting head and the mounting groove 29 of the cutting shank 2 are in clearance fit, with a clearance range of 0.001 to 0.05 mm on one side.

[0057] During installation, the first positioning inclined surface 13 and the second positioning inclined surface 14 on both sides of the cutter head move downwards along the two inclined surfaces 24 of the tool holder 2, placing the cutter head into the mounting groove 29. The groove 16 at the bottom of the cutter head is located on the bottom surface 26 of the mounting groove of the tool holder 2, and is positioned by the two positioning surfaces 251 and the two inclined surfaces 24. Two screws are used to pass through the two threaded holes 28 respectively and are locked in the first positioning hole 11 and the second positioning hole 12 respectively, thereby installing the cutter head in the mounting groove 29 and abutting against the fixing block 25 and the inclined surfaces 24. Compared with the locking method of one screw, this utility model uses two screws to lock the cutter head and the tool holder 2, which provides a very reliable lock. Moreover, this radial locking method allows the tool holder 2 to change the cutter head without leaving the machine tool, realizing quick-change of cutter head.

[0058] The groove 16 at the bottom of the cutter head is located on the bottom surface 26 of the mounting groove of the cutter bar 2. During the processing, the bottom surface 26 of the mounting groove of the cutter bar 2 will form an upward protruding material residue. The groove 16 can adapt to the material residue and provide clearance space for it, so that the cutter head can be completely wedge-fitted and installed in the mounting groove 29 of the cutter bar 2.

[0059] In summary, the cutting head provided by this utility model has two positioning holes, and the cutting shank has two threaded holes corresponding to the two positioning holes of the cutting head. Two screws are passed through the two threaded holes and locked into the two positioning holes, so that the cutting head is fixed to the cutting shank by the two screws, preventing loosening and ensuring a firm lock. Moreover, each positioning hole and each threaded hole can be matched and aligned during each installation, resulting in high repeatability of the cutting head's positioning and convenient assembly and disassembly. In addition, when the cutting head is installed on the cutting shank, the two "V"-shaped positioning bevels at the bottom of the cutting head abut against the two bevels of the cutting shank, enabling the cutting head to achieve V-shaped angle positioning. The positioning is firm and reliable, preventing the cutting head from shifting position. Furthermore, each positioning bevel of the cutting head can be matched with each bevel of the cutting shank, making assembly quick and convenient and ensuring the assembly efficiency of the cutting head and cutting shank.

[0060] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cutting head, characterized in that, The device includes a cutter head body (1), which is provided with a first positioning hole (11), a second positioning hole (12), a first positioning inclined surface (13) located below the first positioning hole (11), and a second positioning inclined surface (14) located below the second positioning hole (12). A first flat surface (18) is provided on one side of the cutter head body (1), and a second flat surface (19) is provided on the other side. A first arc-shaped groove (181) is provided on one side of the first flat surface (18), and a second arc-shaped groove (191) is provided on one side of the second flat surface (19). The first positioning hole (11) passes through the first flat surface (18) and the second arc-shaped groove (191), and the second positioning hole (12) passes through the second flat surface (19) and the first arc-shaped groove (181).

2. The cutting head according to claim 1, characterized in that, The first positioning inclined surface (13) and the second positioning inclined surface (14) form a "V" shaped structure. The bottom of the cutter head body (1) is provided with a bottom surface (15), and the first positioning inclined surface (13) and the second positioning inclined surface (14) extend to the bottom surface (15).

3. The cutting head according to claim 2, characterized in that, The bottom surface (15) is provided with a groove (16).

4. The cutting head according to claim 3, characterized in that, The top of the cutter body (1) is provided with a blade tip (17).

5. The cutting head according to claim 4, characterized in that, The first positioning hole (11) and the second positioning hole (12), the first flat surface (18) and the second flat surface (19), the first arc groove (181) and the second arc groove (191) are all arranged in a centrally symmetrical manner about the central axis between the blade tip (17) and the bottom surface (15).

6. The cutting head according to claim 1, characterized in that, Both the first positioning hole (11) and the second positioning hole (12) are countersunk holes. The center distance between the first positioning hole (11) and the second positioning hole (12) is defined as A, the diameter of the cutter body (1) is D, the height of the cutter body (1) is H, and the thickness of the cutter body (1) is W, satisfying the following relationship: 40%D≤A≤60%D; 60%D≤H≤80%D; 30%D≤W≤50%D.

7. A cutting tool, characterized in that, The tool includes a tool holder (2) and a tool head as described in any one of claims 1-6. The tool holder (2) includes a clamping handle (21) and a tool body (22) disposed on one side of the clamping handle (21). The top of the tool body (22) is provided with a mounting groove (29). Fixing blocks (25) are provided on both sides of the mounting groove (29). Each fixing block (25) is provided with a threaded hole (28). The two threaded holes (28) correspond to the first positioning hole (11) and the second positioning hole (12) respectively. The tool head body (1) is installed in the mounting groove (29) by screws passing through the two threaded holes (28), the first positioning hole (11) and the second positioning hole (12), and abuts against the fixing block (25).

8. The cutting tool according to claim 7, characterized in that, The clamping handle (21) is a cylindrical handle or a side-fixed handle. The clamping handle (21) and the blade body (22) are provided with a through central hole (27). The clamping handle (21) and the blade body (22) are aligned with the axis of the blade body (22). Two spiral grooves (23) are provided on the surface of the blade body (22).

9. The cutting tool according to claim 8, characterized in that, The mounting groove (29) includes a bottom surface (26) and inclined surfaces (24) on both sides of the bottom surface (26). The bottom surface (26) is perpendicular to the axis of the blade body (22). The fixing block (25) has a positioning surface (251) on the side near the mounting groove (29). The two positioning surfaces (251) abut against the first flat surface (18) and the second flat surface (19) respectively. The two inclined surfaces (24) abut against the first positioning inclined surface (13) and the second positioning inclined surface (14) respectively.

10. The cutting tool according to claim 9, characterized in that, The number of fixed blocks (25) and positioning surfaces (251) are both two. The two positioning surfaces (251) are parallel to each other, and the distance between the two positioning surfaces (251) is equal to the width of the mounting groove (29). The width of the groove is 0.2 to 0.5 times the diameter of the blade body (22), and the depth of the mounting groove (29) is 0.3 to 0.5 times the diameter of the blade body (22).

Images