Gun drill

Abstract

The utility model relates to the technical field of cutters, and particularly discloses a gun drill. The cutter bar is coaxially connected with the cutter handle; the tool bit is coaxially connected with the tool bar, and the end face, deviating from the tool bar, of the tool bit is provided with a front tool face, a blade and a rear tool face which are sequentially connected; the chip grooves are formed in the side face of the tool bar and the side face of the tool bit, one ends of the chip grooves extend to the end face of the tool bar and penetrate through the front tool face, the blade and the rear tool face, and the other ends of the chip grooves and the tool handle are arranged at intervals; the first chip breaker groove is formed in the front cutter face, the cutting edge and the rear cutter face, and one end of the first chip breaker groove penetrates through the rear cutter face and communicates with the chip removal groove. According to the gun drill, the chip breaking function can be achieved, the chip winding phenomenon is reduced, and the deep hole machining efficiency is improved.

Description

Gun drill Technical Field

[0001] This application relates to the field of cutting tool technology, specifically to a gun drill. Background Technology

[0002] Gun drills are high-precision cutting tools specifically designed for deep hole machining (hole depth-to-diameter ratio typically >10:1), and are widely used in deep hole machining in industries such as aerospace, automotive, mold making, and energy. However, due to issues such as the chip removal characteristics and machining methods of gun drills, chip entanglement can occur during machining, thus affecting the efficiency of deep hole machining. Summary of the Invention

[0003] In view of the above, it is necessary to propose a gun drill to achieve chip breaking function, reduce the occurrence of chip entanglement, and improve the efficiency of deep hole machining.

[0004] This application provides a gun drill, comprising: a shank; a shank coaxially connected to the shank; a drill head coaxially connected to the shank, the drill head having a front face, a cutting edge, and a rear face sequentially connected on its end face away from the shank; a chip removal groove formed on the side of the shank and the side of the drill head, one end of the chip removal groove extending to the end face of the shank and penetrating the front face, the cutting edge, and the rear face, the other end of the chip removal groove being spaced apart from the shank; and a first chip breaking groove formed on the front face, the cutting edge, and the rear face, one end of the first chip breaking groove passing through the rear face and communicating with the chip removal groove.

[0005] When the aforementioned gun drill performs deep hole machining on a product, the cutting edge on the cutter head drills the product. The chips generated during drilling are discharged into the chip removal groove via the rake face and then discharged through the chip removal groove. In particular, since the first chip breaking groove passes through the cutting edge to split the cutting edge in two, the first chip breaking groove on the end face of the cutter head can prevent the chips generated by the cutting edge from being too large during the drilling process. The cutting edge is split in two and will also generate the expected built-up edge during continuous machining, forming a protrusion to facilitate the cutting of large continuous chips generated during drilling, thereby achieving the chip breaking function. This allows the chips to be smoothly discharged into the chip removal groove via the rake face, reducing the occurrence of chip entanglement and improving the efficiency of deep hole machining.

[0006] In some embodiments, the gun drill further includes a second chip-breaking groove, which is formed on the side of the drill bit, and both ends of the second chip-breaking groove are connected to the chip removal groove.

[0007] The aforementioned gun drill, by setting the second chip-breaking groove, which is annular and whose two ends are connected to the chip removal groove, compresses the chips generated by the drill bit into the chip removal groove. The second chip-breaking groove can break up longer chips in the chip removal groove, so that a large amount of tangled chips will not be generated in the chip removal groove. The chips can be smoothly discharged through the chip removal groove, thereby achieving the chip-breaking function, further reducing the occurrence of chip entanglement, and improving the efficiency of deep hole machining.

[0008] In some embodiments, the shape of the cross section of the second chip breaker groove perpendicular to its extension direction is V-shaped.

[0009] The aforementioned gun drill ensures that the chip-breaking function of the second chip-breaking groove is successfully realized by limiting the cross-sectional shape of the second chip-breaking groove to V-shape.

[0010] In some embodiments, the included angle of the second chip breaker groove ranges from 25° to 35°.

[0011] The aforementioned gun drill, by limiting the included angle range of the second chip breaker groove, firstly ensures that the chip breaker function of the second chip breaker groove is successfully realized, and secondly ensures that the structural strength of the drill bit is not affected.

[0012] In some embodiments, the first chip breaker groove has a V-shaped cross-section perpendicular to its extension direction.

[0013] The aforementioned gun drill ensures that the chip-breaking function of the first chip-breaking groove is successfully realized by limiting the cross-sectional shape of the first chip-breaking groove to V-shape.

[0014] In some embodiments, the included angle of the first chip breaker groove ranges from 25° to 35°.

[0015] The aforementioned gun drill, by limiting the included angle range of the first chip breaker groove, firstly ensures that the chip breaker function of the first chip breaker groove is successfully realized, and secondly ensures that the structural strength of the drill head is not affected.

[0016] In some embodiments, the gun drill further includes a liquid inlet hole, which sequentially penetrates the interior of the tool holder, the tool bar, and the tool head, and is arranged in parallel with the chip removal groove.

[0017] The aforementioned gun drill, by opening the aforementioned liquid inlet hole, allows liquids such as coolant or oil to be sprayed through the liquid inlet hole during deep hole machining. Firstly, this cools the cutting head and the product, ensuring smooth drilling. Secondly, the liquid flowing out through the chip removal groove can carry away the chips, which is beneficial for chip removal.

[0018] In some embodiments, the liquid inlet includes a first hole and a second hole, the first hole penetrating the interior of the handle, the second hole penetrating the interior of the blade and the blade head, the first hole communicating with the second hole, and the diameter of the first hole being larger than the diameter of the second hole.

[0019] The aforementioned gun drill, by defining the liquid inlet hole as a first hole and a second hole, and defining the diameter of the first hole as larger than the diameter of the second hole, serves two purposes: firstly, the larger diameter first hole is used to connect to an external liquid supply source to ensure a smooth supply of liquid; secondly, the smaller diameter second hole is used to spray liquid onto the product, which helps to increase the liquid flow rate, accelerate the liquid flowability, and ensure that the liquid can smoothly carry out debris.

[0020] In some embodiments, a reinforcing portion is provided inside the second hole, and the reinforcing portion is disposed on the hole wall of the second hole near the chip removal groove.

[0021] The aforementioned gun drill enhances the structural strength of the tool holder and the tool head by providing a reinforcing part within the second hole, thereby reducing the impact of the chip removal groove on the structural strength of the tool holder and the tool head.

[0022] In some embodiments, the diameter of the cutting head is larger than the diameter of the cutting shank.

[0023] The aforementioned gun drill, by limiting the diameter of the cutting head to be larger than the diameter of the shank, avoids the shank affecting the accuracy of deep hole machining, thus ensuring the accuracy of deep hole machining. Attached Figure Description

[0024] Figure 1 is a schematic diagram of the structure of the gun drill provided in an embodiment of this application.

[0025] Figure 2 is an enlarged schematic diagram of the structure of region II shown in Figure 1.

[0026] Figure 3 is a bottom view of the gun drill shown in Figure 1.

[0027] Explanation of main component symbols: Gun drill 100, tool holder 10, tool shank 20, tool head 30, rake face 32, cutting edge 34, flank face 36, chip removal groove 40, first chip breaking groove 50, second chip breaking groove 60, liquid inlet 70, first hole 72, second hole 74, reinforcing part 80, central axis 200. Detailed Implementation

[0028] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0029] In the description of this application, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, it should be noted that "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows communication between the two components; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] The following will describe some embodiments of this application in detail with reference to the accompanying drawings.

[0032] Please refer to Figure 1. This application embodiment provides a gun drill 100. The gun drill 100 is used for deep hole machining of a product (not shown). The product can be made of a soft material; understandably, in other embodiments, the product can also be metal or other hard materials. For ease of understanding and illustration, this application embodiment defines the gun drill 100 as having a virtual central axis 200, which rotates around the central axis 200 during deep hole machining of the product.

[0033] Please refer to Figures 2 and 3. The gun drill 100 includes a handle 10, a shank 20, a cutting head 30, a chip removal groove 40, and a first chip breaking groove 50.

[0034] The tool holder 10, tool shank 20, and tool head 30 are connected sequentially and coaxially. The tool holder 10 is used to connect to external equipment (not shown) such as a CNC machine tool to drive the gun drill 100 to move and rotate. The tool shank 20 is used to extend the length of the gun drill 100 so that the gun drill 100 can perform deep hole machining. The length of the tool shank 20 can be adapted to actual machining needs, and this embodiment does not specifically limit it. The tool head 30 is used to drill the product. The end face of the tool head 30 opposite to the tool shank 20 is provided with a front cutting face 32, a cutting edge 34, and a rear cutting face 36 connected in sequence. The cutting edge 34 is used to drill the product, the front cutting face 32 is used to discharge the chips generated during drilling, and the rear cutting face 36 is used to ensure that the end face of the tool head 30 is separated from the product, ensuring that only the cutting edge 34 contacts the product on the end face of the tool head 30.

[0035] Chip removal groove 40 is formed on the side of tool holder 20 and tool head 30. The extension direction of chip removal groove 40 is parallel to the central axis 200. One end of chip removal groove 40 extends to the end face of tool holder 20 and passes through rake face 32, cutting edge 34 and flank face 36, so that the chips generated by the cutting edge 34 are discharged into chip removal groove 40 through rake face 32. Chips on flank face 36 can also be discharged into chip removal groove 40. The other end of chip removal groove 40 is spaced apart from tool holder 10 to ensure that the length of chip removal groove 40 is sufficient to discharge chips.

[0036] The first chip breaker groove 50 is formed on the rake face 32, the cutting edge 34, and the flank face 36. One end of the first chip breaker groove 50 passes through the flank face 36 and communicates with the chip removal groove 40. The other end of the first chip breaker groove 50 is located on the rake face 32. It can be understood that the first chip breaker groove 50 "divides" the cutting edge 34 in two. The first chip breaker groove 50 extends in a generally arc shape to be distributed on the rake face 32, the cutting edge 34, and the flank face 36. By limiting the extension of the first chip breaker groove 50 to a generally arc shape, it is beneficial to ensure the structural strength of the cutting head 30. It can be understood that in other embodiments, the first chip breaker groove 50 may also extend in a generally straight line, L-shape, or other shapes. This application embodiment does not specifically limit this.

[0037] In this embodiment, when the gun drill 100 performs deep hole machining on a product, the cutting edge 34 on the cutter head 30 abuts against the product. When the gun drill 100 rotates, the cutting edge 34 on the cutter head 30 drills the product. The chips generated during drilling are discharged into the chip removal groove 40 through the rake face 32 and then discharged through the chip removal groove 40. Since the first chip breaking groove 50 passes through the cutting edge 34 to split the cutting edge 34 in two, the first chip breaking groove 50 on the end face of the cutter head 30 can prevent the chips generated by the cutting edge 34 from being too large during the drilling process. The cutting edge 34 is split in two and will also generate the expected built-up edge during continuous machining, forming a protrusion to facilitate the cutting of large continuous chips generated during the drilling process, thereby achieving the chip breaking function. This allows the chips to be smoothly discharged into the chip removal groove 40 through the rake face 32, reducing the occurrence of chip entanglement and improving the efficiency of deep hole machining.

[0038] In this embodiment, the cross-sectional shape of the first chip breaker groove 50 perpendicular to its extension direction is V-shaped. The included angle of the first chip breaker groove 50 ranges from 25° to 35°. Preferably, the included angle of the first chip breaker groove 50 is 29°. It is understood that in other embodiments, the included angle of the first chip breaker groove 50 can also be 25°, 26°, 27°, 28°, 30°, 31°, 32°, 33°, 34°, 35°, etc., and this application embodiment does not specifically limit this. Thus, by limiting the cross-sectional shape of the first chip breaker groove 50 to V-shaped, the cross-sectional shape of the first chip breaker groove 50 is reasonable, ensuring that the first chip breaker groove 50 can divide the cutting edge 34 in two, thus ensuring that the chip breaker function of the first chip breaker groove 50 is successfully realized. By limiting the included angle range of the first chip breaker groove 50, firstly, the chip breaker function of the first chip breaker groove 50 is successfully realized, and secondly, the structural strength of the cutting head 30 is not affected. However, when the included angle of the first chip breaker groove 50 is less than 25°, the included angle of the first chip breaker groove 50 is too small, and the effect of the blade 34 being split in two is not obvious, affecting the cutting effect of the blade 34. When the included angle of the first chip breaker groove 50 is greater than 35°, the included angle of the first chip breaker groove 50 is too large, affecting the structural strength of the cutter head 30.

[0039] In this embodiment, the gun drill 100 also includes a second chip breaker groove 60. The second chip breaker groove 60 is located on the side of the drill bit 30, and is annular around the central axis 200, with both ends connected to the chip removal groove 40. Thus, by providing the aforementioned second chip breaker groove 60, which is annular and connected to the chip removal groove 40 at both ends, the chips generated during drilling by the drill bit 30 are squeezed into the chip removal groove 40. The second chip breaker groove 60 can separate longer chips within the chip removal groove 40, avoiding chip continuity and preventing the generation of a large amount of tangled chips due to continuous chip accumulation. This allows the chips to be smoothly discharged through the chip removal groove 40, thereby achieving the chip breaking function, further reducing chip entanglement, and improving the efficiency of deep hole machining.

[0040] In this embodiment, the cross-sectional shape of the second chip breaker groove 60 perpendicular to its extension direction is V-shaped. The included angle of the second chip breaker groove 60 ranges from 25° to 35°. Preferably, the included angle of the second chip breaker groove 60 is 29°. It is understood that in other embodiments, the included angle of the second chip breaker groove 60 can also be 25°, 26°, 27°, 28°, 30°, 31°, 32°, 33°, 34°, 35°, etc., and this application embodiment does not specifically limit this. Thus, by limiting the cross-sectional shape of the second chip breaker groove 60 to V-shaped, the chip-breaking function of the second chip breaker groove 60 is ensured to be successfully realized. By limiting the included angle range of the second chip breaker groove 60, firstly, the chip-breaking function of the second chip breaker groove 60 is ensured to be successfully realized, and secondly, the structural strength of the cutter head 30 is not affected. However, when the included angle range of the second chip breaker groove 60 is less than 25°, the included angle range of the second chip breaker groove 60 is too small, affecting the chip-breaking effect of the second chip breaker groove 60. When the included angle of the second chip breaker groove 60 is greater than 35°, the included angle of the second chip breaker groove 60 is too large, which affects the structural strength of the cutter head 30.

[0041] In this embodiment, the gun drill 100 also includes a liquid inlet 70. The liquid inlet 70 passes sequentially through the interior of the tool holder 10, tool shank 20, and tool head 30 along the central axis 200. The liquid inlet 70 is arranged parallel to the chip removal groove 40. The liquid inlet 70 is used to introduce liquid, such as coolant or oil, from the end of the tool holder 10 and spray it out from the end of the tool head 30 to cool the tool head 30 and the product. The liquid then flows out through the chip removal groove 40. As the liquid flows out along the chip removal groove 40, it also carries away the chips within the groove, facilitating chip removal. Thus, by providing the aforementioned liquid inlet 70, the gun drill 100, during deep hole machining, sprays liquid such as coolant or oil through the liquid inlet 70. Firstly, this cools the tool head 30 and the product, ensuring smooth drilling by the tool head 30. Secondly, the liquid flowing out through the chip removal groove 40 carries away chips, facilitating chip removal.

[0042] In this embodiment, the liquid inlet 70 includes a first hole 72 and a second hole 74, both of which can be circular holes. The first hole 72 penetrates the interior of the handle 10, and the second hole 74 penetrates the interior of the shank 20 and the head 30. The first hole 72 and the second hole 74 are connected, and the diameter of the first hole 72 is larger than the diameter of the second hole 74. The first hole 72 is used to communicate with an external liquid supply source (not shown). Thus, by defining the liquid inlet 70 as including a first hole 72 and a second hole 74, and defining the diameter of the first hole 72 as larger than the diameter of the second hole 74, firstly, the larger diameter first hole 72 is used to communicate with the external liquid supply source, ensuring a smooth supply of liquid; secondly, the smaller diameter second hole 74 is used to spray liquid onto the product. When the liquid flows in holes of different diameters, the flow rate of the liquid will change, which is beneficial to increase the flow rate of the liquid, accelerate the fluidity of the liquid, ensure the impact effect and fluidity of the liquid, so as to smoothly carry out the debris.

[0043] In this embodiment, a reinforcing portion 80 is provided within the second hole 74, and the reinforcing portion 80 is disposed on the hole wall of the second hole 74 near the chip removal groove 40. Understandably, after the reinforcing portion 80 is provided within the second hole 74, the second hole 74 is approximately crescent-shaped. Thus, by defining the second hole 74 with the reinforcing portion 80, the structural strength of the tool holder 20 and the tool head 30 is enhanced, and the influence of the chip removal groove 40 on the structural strength of the tool holder 20 and the tool head 30 is reduced.

[0044] In this embodiment, the diameter of the cutting head 30 is larger than the diameter of the tool shank 20, and the diameter of the tool holder 10 is larger than the diameter of the cutting head 30. Specifically, the diameter of the cutting head 30 is slightly larger than the diameter of the tool shank 20. Thus, by limiting the diameter of the cutting head 30 to be larger than the diameter of the tool shank 20, the tool shank 20 is prevented from affecting the accuracy of deep hole machining, ensuring the accuracy of deep hole machining.

[0045] In this embodiment, the gun drill 100 features a first chip breaker groove 50 and a second chip breaker groove 60. The first chip breaker groove 50 passes through the cutting edge 34, dividing it in two. During drilling, the first chip breaker groove 50 on the end face of the drill head 30 prevents the cutter edge 34 from producing excessively large chips. The cutting edge 34 is divided in two, and during continuous machining, the expected built-up edge is generated, forming a protrusion to facilitate cutting large continuous chips produced during drilling, thus achieving the chip-breaking function. The second chip breaker groove 60 is annular, and both ends of the second chip breaker groove 60 are connected to the chip removal groove 40. The drill bit 30, through drilling, compresses the chips generated into the chip removal groove 40. The second chip breaking groove 60 can break up longer chips within the chip removal groove 40, preventing the formation of large amounts of rolled chips due to their length. The chips can then be smoothly discharged through the chip removal groove 40, thus achieving the chip breaking function. By providing a liquid inlet 70, the drill bit 100 can spray liquid, allowing the chips to flow back along with the liquid through the chip removal groove 40 and be discharged. The built-up edge generated during machining will also flow back with the liquid and will not cause substantial damage to the inner wall of the deep hole, ensuring a high yield rate in deep hole machining. In this embodiment, the drill bit 100, by providing the first chip breaking groove 50 and the second chip breaking groove 60, not only possesses the machining capabilities of traditional cutting tools but also has its own advantageous chip breaking capabilities, which is beneficial for leveraging its significant advantages in deep hole machining.

[0046] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A gun drill, characterized in that, include: Handle; The tool holder is coaxially connected to the tool shank; The cutting head is coaxially connected to the cutting bar, and the end face of the cutting head opposite to the cutting bar is provided with a front cutting face, a cutting edge and a rear cutting face connected in sequence; A chip removal groove is formed on the side of the tool holder and the side of the tool head. One end of the chip removal groove extends to the end face of the tool holder and passes through the front cutting face, the cutting edge and the rear cutting face. The other end of the chip removal groove is spaced apart from the tool shank. A first chip breaking groove is formed on the front cutting face, the cutting edge and the rear cutting face. One end of the first chip breaking groove passes through the rear cutting face and communicates with the chip removal groove.

2. The gun drill as described in claim 1, characterized in that, The gun drill also includes a second chip-breaking groove, which is formed on the side of the drill bit, and both ends of the second chip-breaking groove are connected to the chip removal groove.

3. The gun drill as described in claim 2, characterized in that, The second chip breaker groove has a V-shaped cross-section perpendicular to its extension direction.

4. The gun drill as described in claim 3, characterized in that, The included angle of the second chip-breaking groove ranges from 25° to 35°.

5. The gun drill as described in claim 1, characterized in that, The first chip breaker groove has a V-shaped cross-section perpendicular to its extension direction.

6. The gun drill as described in claim 5, characterized in that, The included angle of the first chip breaking groove ranges from 25° to 35°.

7. The gun drill as described in claim 1, characterized in that, The gun drill also includes a liquid inlet hole, which passes through the interior of the tool holder, the tool bar, and the tool head in sequence, and the liquid inlet hole is arranged in parallel with the chip removal groove.

8. The gun drill as described in claim 7, characterized in that, The liquid inlet includes a first hole and a second hole. The first hole penetrates the interior of the handle, and the second hole penetrates the interior of the blade and the blade head. The first hole and the second hole are in communication, and the diameter of the first hole is larger than the diameter of the second hole.

9. The gun drill as described in claim 8, characterized in that, A reinforcing part is provided inside the second hole, and the reinforcing part is provided on the hole wall of the second hole near the chip removal groove.

10. The gun drill as described in claim 1, characterized in that, The diameter of the cutting head is larger than the diameter of the cutting shank.

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