A multi-functional thread milling cutter with reverse drilling function

Abstract

This utility model discloses a multi-functional thread milling cutter integrating back drilling, comprising a insert body, the insert body including a cutting part and a tool holder, the cutting part being disposed at one end of the tool holder and integrally formed with the tool holder; the cutting part having at least two chip grooves arranged along the insert axial direction, and an upper cutting edge, a lower cutting edge, and thread teeth arranged along the outer peripheral surface of the cutting part; the upper cutting edge, thread teeth, and lower cutting edge are sequentially distributed along the axial direction of the tool holder from the end closest to the tool holder to the end furthest from the tool holder. This utility model can continuously complete drilling, chamfering, and thread milling processes with only one clamping, reducing the number of tool changes and downtime, while eliminating multiple tool setting auxiliary processes, significantly improving the overall efficiency of batch processing.

Description

Technical Field

[0001] This utility model belongs to the field of cutting tool technology, and in particular, relates to a multi-functional thread milling cutter that integrates back drilling. Background Technology

[0002] A milling cutter is a rotating cutting tool with one or more cutting teeth used for milling. During operation, each cutting tooth sequentially and intermittently removes the excess material from the workpiece. Milling cutters are mainly used on milling machines to machine planes, steps, grooves, shaped surfaces, and cut off workpieces. A thread milling cutter, on the other hand, is a tool used for milling threads. With the development of CNC machining technology, a more advanced thread machining method, namely CNC thread milling, has been realized. Compared with traditional thread machining methods, thread milling has significant advantages in machining accuracy and efficiency, and is not limited by the thread structure or thread direction, thus gaining widespread application.

[0003] Currently available cutting tools on the market are mostly single-function and simple in design. It's easy to see that large CNC machine tools and machining centers often have tool holders or tool magazines, which to some extent limit the reduction of machining time and the improvement of machining efficiency, indirectly increasing machining costs. The poor specialization of these tools is particularly prominent; general-purpose tools cannot meet the machining needs of special products. Furthermore, with technological advancements, product upgrades are inevitable, requiring continuously improving machining accuracy. The precision of the cutting tools and machining positioning are therefore crucial, and the number of tools used to machine the same product directly affects the product's precision and quality.

[0004] Patent application CN220862933U discloses a multi-functional thread milling cutter integrating drilling, tapping, and chamfering. It includes a tool holder, a cutting head, and a mounting assembly. The cutting head comprises a first center rod, a second center rod, a third center rod, two connecting assemblies, three first cutting edges, three second cutting edges, three third cutting edges, and multiple forming edges. The cutting head is located at one end of the tool holder, and the mounting assembly is located between the tool holder and the cutting head. The first cutting edges enable drilling, the second and forming edges enable tapping on the inner wall of the drilled hole, and the third cutting edge enables chamfering at the end of the drilled hole. This milling cutter integrates the first, second, third, and forming edges, allowing for simultaneous drilling, tapping, and chamfering, achieving rapid internal thread machining. No tool changes are required during the entire thread milling process, saving time and effort and improving machining efficiency. The cutting head of this patent is assembled from a first center rod, a second center rod, and a third center rod through an interference fit between a connector rod and a connector hole. The entire head is connected to the tool holder through a mounting rod. This assembly structure can easily affect coaxiality and machining accuracy, leading to a decrease in the precision of machining precision parts. At the same time, drilling produces long, coiled chips, tapping produces spiral chips, and chamfering produces fine chips. When these three types of chips mix, they can easily clog the chip removal groove. In particular, the chips from drilling and tapping can overlap, potentially blocking the chip removal groove and causing the chips to scratch the machined thread surface and the tool to overheat and wear. Utility Model Content

[0005] This utility model primarily addresses the limitations of existing cutting tools, which are mostly single-function and simple in design. It's readily apparent that large CNC machine tools and machining centers contain tool holders or tool magazines, which to some extent restricts the reduction of machining time and the improvement of machining efficiency, indirectly increasing machining costs. The poor specialization of cutting tools is particularly prominent; general-purpose tools cannot meet the machining needs of special products. Furthermore, with technological advancements, product upgrades are inevitable, requiring continuously improving machining accuracy. The precision of cutting tools and machining positioning are therefore crucial. The number of cutting tools used to process the same product directly affects the product's precision and quality. This invention proposes a multi-functional thread milling cutter integrating reverse drilling.

[0006] A multi-functional thread end mill integrating back drilling and thread cutting includes a insert body. The insert body includes a cutting section and a tool holder. The cutting section is located at one end of the tool holder and is integrally formed with the tool holder. The cutting section has at least two chip grooves, which are arranged along the insert axial direction. An upper cutting edge, a lower cutting edge, and thread teeth are provided along the outer peripheral surface of the cutting section. The upper cutting edge, thread teeth, and lower cutting edge are distributed sequentially along the axial direction of the tool holder from the end closest to the tool holder to the end furthest from the tool holder. The upper cutting edge refers to...

[0007] Furthermore, the end of the lower cutting edge away from the tool holder extends to the end of the cutting part to form a drill tip, the edge shape of the lower cutting edge is adapted to the cutting trajectory during drilling, and the section of the lower cutting edge near the drill tip is adapted to the upper chamfering process.

[0008] Furthermore, the angle of the drill tip is 120°.

[0009] Furthermore, the blade body material can be made of high-speed steel or cemented carbide powder.

[0010] Furthermore, the upper cutting edge is used for bottom chamfering, the lower cutting edge is used for upper chamfering and drilling, and the combination of the upper and lower cutting edges is used for milling threads.

[0011] Furthermore, the thread teeth are arranged in a spiral shape, and the angle of the thread teeth is 60°.

[0012] Furthermore, the number of upper cutting edges is the same as the number of lower cutting edges, and each upper cutting edge corresponds to one lower cutting edge, with the chip groove located between two adjacent upper cutting edges.

[0013] Furthermore, the chip groove extends along the axial direction of the cutting part from one end of the lower cutting edge to one end of the upper cutting edge, and the depth of the chip groove gradually changes from the end near the drill tip to the end near the tool holder, with the chip groove depth near the drill tip being greater than the chip groove depth near the tool holder.

[0014] Furthermore, the threaded teeth are provided with an upper flank face and a lower flank face on both sides, and both the upper flank face and the lower flank face are inclined planes.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This utility model includes a blade body, which comprises a cutting section and a tool holder. The cutting section is located at one end of the tool holder and is integrally formed with the tool holder. The cutting section has at least two chip grooves, which are arranged along the blade axial direction. An upper cutting edge, a lower cutting edge, and thread teeth are provided along the outer circumferential surface of the cutting section. The upper cutting edge, thread teeth, and lower cutting edge are distributed sequentially along the axial direction of the tool holder from the end closest to the tool holder to the end furthest from the tool holder. This utility model allows for continuous completion of drilling, chamfering, and thread milling processes with only one clamping, reducing the number of tool changes and downtime, while eliminating multiple tool setting auxiliary processes, significantly improving the overall efficiency of batch processing. The chip groove of this utility model is provided correspondingly to the upper and lower cutting edges, and extends along the axial direction with a gradually changing depth. The chip groove can be adapted to the chip removal requirements of various processes such as drilling (lower cutting edge), chamfering (upper and lower cutting edges), and thread milling (thread teeth), ensuring that the chips can be discharged quickly and continuously during the cutting process, avoiding chip blockage or scratching of the workpiece surface, while reducing the friction and wear of chips on the cutting edge and extending the overall service life of the tool. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is an enlarged schematic diagram of the cutting part structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the cutting part of this utility model from another perspective;

[0020] In the above figure, 1. cutting part; 2. tool holder; 3. upper cutting edge; 4. lower cutting edge; 5. chip groove; 6. thread tooth; 7. upper flank face; 8. lower flank face; 9. drill tip. Detailed Implementation

[0021] To clearly illustrate the technical features of this utility model, the following detailed description, in conjunction with the accompanying drawings, provides a comprehensive overview of the present utility model. Many specific details are set forth in the following description to facilitate a thorough understanding of the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present utility model is not limited to the specific embodiments disclosed below. Furthermore, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the present utility model and simplifying the description. They 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 the present utility model. In addition, 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. Therefore, features defined as "first" and "second" can explicitly or implicitly include one or more of those features. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified. In this utility model, unless otherwise explicitly specified and limited, terms such as "installed," "connected," "joined," 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, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection 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 according to the specific circumstances. In this utility model, unless otherwise explicitly specified and limited, "on" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0022] Example 1

[0023] like Figure 1As shown, a multi-functional thread milling cutter integrating back drilling includes a cutting insert body, which includes a cutting section 1 and a tool holder 2. The cutting section 1 is located at one end of the tool holder 2 and is integrally formed with the tool holder 2. The cutting section 1 has at least two chip grooves 5, which are arranged along the cutting insert axial direction. An upper cutting edge 3, a lower cutting edge 4, and thread teeth 6 are provided along the outer peripheral surface of the cutting section 1. The upper cutting edge 3, thread teeth 6, and lower cutting edge 4 are distributed sequentially along the axial direction of the tool holder 2 from the end closest to the tool holder 2 to the end furthest from the tool holder 2.

[0024] The thread milling cutter of this embodiment is suitable for hole processing of general metal materials such as aluminum alloy and low carbon steel, and can simultaneously complete drilling, chamfering and thread milling processes.

[0025] like Figures 1 to 3 As shown, in this embodiment, the blade body is made of high-speed steel and includes an integrally formed cutting part 1 and a tool holder 2. The outer peripheral surface of the cutting part 1 is sequentially distributed with an upper cutting edge 3, a threaded tooth 6, and a lower cutting edge 4. The end of the lower cutting edge 4 extends to form a drill tip 9, which is adapted for drilling and chamfering functions.

[0026] Two axially extending chip grooves 5 are formed on the outer circumferential surface of the cutting part 1, and the chip grooves 5 are formed between two adjacent upper cutting edges 3. The depth of the chip grooves 5 gradually changes from 3 mm near the drill tip 9 end to 1.5 mm near the tool holder 2 end. The chip grooves 5 penetrate the cutting part 1 to optimize chip removal efficiency. The cutting part 1 has two pairs of upper cutting edges 3 and lower cutting edges 4, and the cutting edges are formed by grinding with a grinding wheel. The two adjacent lower cutting edges 4 extend away from the end of the tool holder 2 to form a 120° drill tip 9. The section near the drill tip 9 is adapted to the upper chamfer, and the upper cutting edges 3 are adapted to the bottom chamfer. The middle section of the cutting part 1 has a spirally arranged 60° threaded tooth 6. The upper cutting edges 3 and lower cutting edges 4 are combined to realize thread milling.

[0027] This embodiment integrates four functions—drilling, upper chamfering, lower chamfering, and thread milling—into a single tool. Multiple processes can be completed in a single setup, significantly improving machining efficiency, and is particularly suitable for applications requiring the machining of threaded blind holes.

[0028] Example 2

[0029] like Figure 1 As shown, a multi-functional thread milling cutter integrating back drilling includes a cutting insert body, which includes a cutting section 1 and a tool holder 2. The cutting section 1 is located at one end of the tool holder 2 and is integrally formed with the tool holder 2. The cutting section 1 has at least two chip grooves 5, which are arranged along the cutting insert axial direction. An upper cutting edge 3, a lower cutting edge 4, and thread teeth 6 are provided along the outer peripheral surface of the cutting section 1. The upper cutting edge 3, thread teeth 6, and lower cutting edge 4 are distributed sequentially along the axial direction of the tool holder 2 from the end closest to the tool holder 2 to the end furthest from the tool holder 2.

[0030] This embodiment is applicable to hole machining of hard metal materials such as stainless steel and bearing steel.

[0031] like Figure 1 As shown, the blade body is formed by sintering cemented carbide powder. The cutting part 1 is provided with two chip grooves 5 to reduce vibration. The depth of the chip grooves 5 gradually changes from 2.5mm to 1mm. When the upper cutting edge 3 and the lower cutting edge 4 are ground with a grinding wheel, CNC grinding wheel dressing technology is used, and the roundness error of the cutting edge is ≤0.005mm.

[0032] like Figure 2 As shown, the cutting edges of the upper cutting edge 3 and the lower cutting edge 4 are both shaped by precision grinding with a grinding wheel, forming a specific groove shape (such as a sharp cutting edge with a chip-breaking groove) to effectively control the chip morphology and reduce the generation of built-up edge. The threaded tooth 6 has an upper flank face 7 and a lower flank face 8 on both sides, and the upper flank face 7 and the lower flank face 8 are precisely ground into inclined planes, providing sufficient clearance angles to reduce friction with the machined surface, reduce cutting heat, and extend tool life.

[0033] Example 3

[0034] like Figure 1 As shown, a multi-functional thread milling cutter integrating back drilling includes a cutting insert body, which includes a cutting section 1 and a tool holder 2. The cutting section 1 is located at one end of the tool holder 2 and is integrally formed with the tool holder 2. The cutting section 1 has at least two chip grooves 5, which are arranged along the cutting insert axial direction. An upper cutting edge 3, a lower cutting edge 4, and thread teeth 6 are provided along the outer peripheral surface of the cutting section 1. The upper cutting edge 3, thread teeth 6, and lower cutting edge 4 are distributed sequentially along the axial direction of the tool holder 2 from the end closest to the tool holder 2 to the end furthest from the tool holder 2.

[0035] This embodiment is designed for the machining of large M16 threads on cast iron parts. It uses ultra-fine grain cemented carbide powder molding to improve impact resistance and adapt to the brittle cutting characteristics of cast iron.

[0036] like Figures 1 to 3 As shown, the insert body has two symmetrical chip grooves 5 along the axial direction, each 5mm wide. The depth of the chip grooves 5 gradually changes from the drill tip 9, which is farther from the tool holder 2, to the end closer to the tool holder 2, ensuring continuous chip removal during drilling and thread milling operations. The wide groove design is suitable for removing large cast iron chips. The drill tip 9 is blunted to prevent chipping from hard points in the cast iron. The lower cutting edge 4 has a 60° cutting edge near the drill tip 9, suitable for large-angle chamfering of cast iron parts, with a chamfer width of 2mm.

[0037] The thread tooth 6 has a tooth profile angle of 60° and a pitch of 3mm (M16 coarse thread), which improves the milling efficiency of coarse threads. The upper and lower back face 8 of the thread tooth 6 has an inclination angle of 4° (increasing the wear allowance of the back face). The upper cutting edge 3 is equipped with a 60° cutting edge for chamfering the bottom of the workpiece.

[0038] This embodiment solves the problem of large chip clogging in cast iron by using wide-groove chip channels, and improves the chipping resistance of ultra-fine grain cemented carbide.

[0039] Obviously, the above-described embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-functional thread end mill integrating reverse drilling, comprising a cutting tool body, characterized in that, The blade body includes a cutting section and a tool holder. The cutting section is located at one end of the tool holder and is integrally formed with the tool holder. The cutting section has at least two chip grooves, which are arranged along the blade axis. An upper cutting edge, a lower cutting edge, and threaded teeth are provided along the outer peripheral surface of the cutting section. The upper cutting edge, threaded teeth, and lower cutting edge are distributed sequentially along the axial direction of the tool holder from the end closest to the tool holder to the end furthest from the tool holder.

2. The multi-functional thread milling cutter integrating reverse drilling according to claim 1, characterized in that, The lower cutting edge extends from the end away from the tool holder to the end of the cutting part to form a drill tip. The cutting edge shape of the lower cutting edge is adapted to the cutting trajectory during drilling. The section of the lower cutting edge near the drill tip is adapted to the upper chamfering process.

3. The multi-functional thread milling cutter integrating reverse drilling according to claim 2, characterized in that, The angle of the drill tip is 120°.

4. The multi-functional thread milling cutter integrating reverse drilling according to claim 1, characterized in that, The blade body can be made of high-speed steel or cemented carbide powder.

5. A multi-functional thread milling cutter integrating reverse drilling according to claim 1, characterized in that, The cutting edge grooves of the upper and lower cutting edges are formed by grinding with a grinding wheel.

6. A multi-functional thread milling cutter integrating reverse drilling according to claim 5, characterized in that, The upper cutting edge is used for bottom chamfering, and the lower cutting edge is used for upper chamfering and drilling. The combination of the upper and lower cutting edges is used for milling threads.

7. A multi-functional thread end mill integrating reverse drilling according to claim 1, characterized in that, The thread teeth are arranged in a spiral shape, and the angle of the thread teeth is 60°.

8. A multi-functional thread milling cutter integrating reverse drilling according to claim 1, characterized in that, The number of upper cutting edges is the same as the number of lower cutting edges, and each upper cutting edge corresponds to one lower cutting edge. The chip groove is located between two adjacent upper cutting edges.

9. A multi-functional thread milling cutter integrating reverse drilling according to claim 1, characterized in that, The chip groove extends along the axial direction of the cutting part from one end of the lower cutting edge to one end of the upper cutting edge, and the depth of the chip groove gradually changes from the end near the drill tip to the end near the tool holder, with the chip groove depth near the drill tip being greater than the chip groove depth near the tool holder.

10. A multi-functional thread milling cutter integrating reverse drilling according to claim 1, characterized in that, The threaded teeth are provided with an upper rear cutting surface and a lower rear cutting surface on both sides, and both the upper rear cutting surface and the lower rear cutting surface are inclined planes.

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