Solid carbide thread milling cutter with independent flutes

Abstract

The application provides a whole cemented carbide thread milling cutter with independent flow guide grooves, characterized in that each thread cutting tooth has a rake face, a relief face and a cutting edge formed by the intersection of the rake face and the relief face, the cutting edge comprises an axial cutting edge at the top of the thread cutting tooth and two radial cutting edges connected with the axial cutting edge and extending to the bottom of the thread cutting tooth, and at least part of the thread cutting tooth is provided with a groove on the rake face, the groove has a groove bottom and a groove surface extending from the groove bottom to the axial cutting edge and the radial cutting edge, so as to form an independent flow guide groove on the corresponding thread cutting tooth. The thread milling cutter has the advantages of enhancing the cooling effect, enhancing the tool structure, optimizing the chip removal, keeping sharp and improving the machining stability, and provides solid technical support for high-efficiency and high-precision thread machining, and meets the strict requirements of modern manufacturing industry on the tool performance.

Description

Technical Field

[0001] This utility model relates to the field of cutting technology, and in particular to an integral carbide thread milling cutter with independent guide grooves. Background Technology

[0002] In the field of mechanical manufacturing, the performance of thread cutting tools is crucial for ensuring machining efficiency and workpiece quality. Although traditional solid carbide thread cutting tools are widely used due to their excellent hardness characteristics, they face a series of severe challenges in actual operation. During high-speed cutting, cutting fluid has difficulty effectively penetrating to the core area where the cutting edge contacts the workpiece. Especially when the machining area penetrates deep into the material, the temperature at the cutting interface rises sharply. This not only leads to thermal softening of the tool material and build-up edge adhesion but also causes thermal cracking of the cutting edge, thus severely shortening the tool's service life. In addition, when handling high-load machining tasks, especially when machining viscous materials such as aluminum alloys, titanium alloys, and nickel-based alloys, the chip flute design of existing tools often suffers from insufficient cooling, resulting in chip retention and adhesion to the tool rake face. This not only accelerates cutting edge wear and increases cutting resistance but also easily leaves scratches on the machined surface, affecting the overall quality of the workpiece. More seriously, during high-speed rotation, traditional tools often lose a large amount of cutting fluid due to splashing. This not only significantly reduces the utilization efficiency of the coolant but also makes it difficult for the lubricating film to form continuously and stably, often leading to chipping of the cutting edge and a significant increase in the surface roughness of the machined surface. Therefore, the numerous shortcomings of existing thread cutting tools in practical applications urgently require technological innovation to comprehensively improve their overall performance, so as to better adapt to the ever-increasing processing demands and ensure a dual improvement in processing efficiency and workpiece quality. Utility Model Content

[0003] This utility model provides a solid carbide thread end mill with an independent guide groove, which includes the following embodiments:

[0004] Implementation Method 1. A solid carbide thread end mill with independent guide grooves, characterized in that it comprises:

[0005] The blade body is made of a single piece of cemented carbide.

[0006] Optional tool holders for direct or indirect connection to machine tools.

[0007] An optional chin for connecting the blade body and the handle.

[0008] The tool body has multiple cutting teeth arranged along its circumference, and chip removal grooves are provided between adjacent cutting teeth. Each cutting tooth has one or more threaded cutting teeth arranged along the axial direction of the tool body. The threaded cutting teeth complete the cutting of the required thread profile through the rotational motion of the tool.

[0009] Each thread cutting tooth independently has a rake face, a flank face, and a cutting edge formed by the intersection of the rake face and the flank face. The cutting edge includes an axial cutting edge located at the top of the thread cutting tooth, and two radial cutting edges connected to the axial cutting edge and extending towards the bottom of the thread cutting tooth.

[0010] At least some of the thread cutting teeth have grooves on their rake faces, the grooves having a bottom and a groove surface extending from the bottom to the axial and radial cutting edges, thereby forming an independent guide groove on the corresponding thread cutting teeth.

[0011] Implementation Method 2. The integral carbide thread cutter with independent guide grooves according to Implementation Method 1 is characterized in that, in the direction perpendicular to the cutting edge, the depth of the groove gradually increases with the distance from the cutting edge and reaches a maximum value at the bottom of the groove.

[0012] Implementation Method 3. The integral carbide thread cutter with an independent guide groove according to Implementation Method 1, characterized in that the groove extends into the chip removal groove.

[0013] Embodiment 4. The integral carbide thread cutter with independent guide grooves according to Embodiment 1, characterized in that the groove bottom has a maximum groove depth, and the groove bottom is located in the area between two radial cutting edges.

[0014] Embodiment 5. The integral carbide thread cutter with independent guide groove according to Embodiment 1, characterized in that the thread cutting tooth has a first rake angle, the groove surface has a surface extending to near the cutting edge, and the surface near the cutting edge forms a second rake angle greater than the corresponding first rake angle.

[0015] Implementation Method 6. The integral carbide thread cutter with independent guide grooves according to Implementation Method 1 is characterized in that the grooves provided on adjacent thread cutting teeth are not interconnected.

[0016] Embodiment 7. The integral carbide thread cutter with independent guide grooves according to Embodiment 1, characterized in that the core thickness of the thread cutter is 60%-85% of the cutter body diameter.

[0017] Embodiment 8. The integral carbide thread cutter with independent guide grooves according to Embodiment 1, characterized in that the radial cutting edge has a convex arc cutting edge segment that protrudes in the cutting rotation direction from near the top of the thread cutting tooth.

[0018] Embodiment 9. The integral carbide thread end mill with independent guide groove according to Embodiment 1, characterized in that the diameter of the cutter body is 0.5mm to 6mm, for example 0.6mm to 5mm, for example 0.8mm to 4mm, for example 1mm to 3mm.

[0019] Implementation Method 10. The integral carbide thread cutter with independent guide groove according to Implementation Method 1, characterized in that the chip removal groove is a straight groove or a spiral groove extending spirally along the axial direction of the cutter body, and the spiral angle of the spiral groove is greater than 0 degrees and less than or equal to 35 degrees.

[0020] Embodiment 11. A method for preparing an integral carbide thread end mill with an independent guide groove as described in any one of Embodiments 1 to 10, characterized in that the independent guide groove is prepared by a machining method that does not produce thermal damage.

[0021] Implementation Method 12. The method according to Implementation Method 11, wherein the independent flow channel is prepared by a femtosecond pulsed laser processing method.

[0022] Embodiment 13. A method for preparing a solid carbide thread cutter with independent guide grooves as described in any one of Embodiments 1 to 10, characterized in that it comprises the following steps:

[0023] Chip vents and thread cutting teeth are ground onto the thread milling cutter blank to form the rake face.

[0024] A groove is machined on the rake face using a femtosecond pulsed laser, thereby forming an independent guide groove on the corresponding thread cutting tooth.

[0025] This utility model proposes an innovative tool design strategy and provides a thread end mill that integrates coolant directional delivery, dynamic chip management, and friction interface optimization. Its beneficial technical effects include:

[0026] 1. The innovative design of this application can effectively prevent key problems such as tool thermal damage, accelerated wear, and thermal fatigue caused by high temperatures during cutting. The independent guide channel in this application promotes a positive change in the interaction mode between the tool surface and the coolant under centrifugal force. Specifically, the independent guide channel guides the coolant along the chip removal channel to the cutting edge, precisely directing it to the core cutting area under centrifugal force, significantly improving cooling efficiency, effectively preventing tool thermal damage, accelerated wear, and thermal fatigue, and greatly extending tool life. It also increases machining speed and feed per tooth, thereby improving machining efficiency.

[0027] 2. The innovative design of the independent guide channel ensures that the coolant can reach the cutting area directly and act directly on the friction interface between the tool and the workpiece. The coolant itself has good lubrication function. After contacting the friction interface, it can significantly reduce the coefficient of friction, thereby reducing cutting force, cutting heat and reducing tool surface wear.

[0028] 3. Independent guide channels provide a larger chip removal space, which helps chips to be discharged smoothly, reduces the risk of chip accumulation and blockage, reduces damage to the tool, and ensures smooth machining. Efficient chip removal not only reduces tool wear, but also avoids chip scraping on the tool surface, extends tool life and improves the quality of the machined surface.

[0029] 4. Because the independent guide grooves on the rake face of the thread cutting teeth also function as chip catchers, they provide additional chip space for the tool. This allows for a smaller chip flute size, which in turn increases the tool's core thickness, resulting in greater rigidity and the ability to withstand higher cutting forces. This helps reduce deformation and vibration, improving machining stability. On the other hand, for end mills with helical flutes, the independent guide grooves on the cutting teeth make the cutting edge sharper, allowing for a smaller helix angle. A smaller helix angle further increases the tool's rigidity, and higher rigidity enables the tool to exhibit excellent bending and vibration resistance under high cutting forces.

[0030] The thread milling cutter of this application exhibits significant technical advantages in enhancing cooling efficiency, strengthening tool structure, optimizing chip removal, maintaining sharpness, and improving machining stability. The technical solution of this application can extend tool life by 2 to 4 times, greatly enhancing tool durability and providing solid technical support for efficient and high-precision thread machining, meeting the stringent requirements of modern manufacturing for tool performance. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0032] Figure 1 This is a perspective view of the thread milling cutter in Embodiment 1 of this application;

[0033] Figure 2 This is a side view of the end of the thread milling cutter body;

[0034] Figure 3 This is a magnified view of a portion of the thread end mill body;

[0035] Figure 4 This is a magnified view of a portion of the thread cutting teeth;

[0036] Figure 5 This is a perspective view of the thread milling cutter head portion in Embodiment 2 of this application;

[0037] Figure 6 This is a magnified view of a portion of the thread cutting teeth;

[0038] Figure 7 This is a magnified view of a separate flow channel;

[0039] Figure 8 This is a schematic diagram of the thread milling cutter structure in Embodiment 3 of this application;

[0040] Figure 9 This is a schematic diagram of the thread cutting teeth;

[0041] Figure 10 This is a schematic diagram of the front angle measurement;

[0042] Figure 11 This is a perspective view of the thread milling cutter in Example 4;

[0043] Figure 12 for Figure 11 A magnified view of the area within the dashed box;

[0044] Figure 13 This is a schematic diagram comparing the force directions of cutting with different cutting edges.

[0045] Reference numerals: 100-tool body, 200-tool shank, 300-tool neck, 110-cutting tooth, 120-thread cutting tooth, 121-rake face, 122-flank face, 123-cutting edge, 130-chip groove, 140-axial cutting edge, 150-radial cutting edge, 160-groove, 161-groove bottom, 162-groove surface, 163-surface near the cutting edge, 170-convex arc cutting edge section, 10-independent guide groove. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0047] This application discloses a solid carbide thread end mill with independent guide grooves, characterized in that it includes:

[0048] The blade body is made of a single piece of cemented carbide.

[0049] Optional tool holders for direct or indirect connection to machine tools.

[0050] An optional chin for connecting the blade body and the handle.

[0051] The tool body is provided with multiple cutting teeth, and chip removal grooves are provided between adjacent cutting teeth. Each cutting tooth has one or more thread cutting teeth, which complete the cutting of the required thread profile through the rotational motion of the tool.

[0052] Each thread cutting tooth independently has a rake face, a flank face, and a cutting edge formed by the intersection of the rake face and the flank face. The cutting edge includes an axial cutting edge located at the top of the thread cutting tooth, and two radial cutting edges connected to the axial cutting edge and extending towards the bottom of the thread cutting tooth.

[0053] At least some of the thread cutting teeth have grooves on their rake faces, the grooves having a bottom and a groove surface extending from the bottom to the axial and radial cutting edges, thereby forming an independent guide groove on the corresponding thread cutting teeth.

[0054] In this application, the "top" of the thread cutting tooth refers to the area of ​​the cutting tooth away from the axis of the tool body, and the "bottom" of the thread cutting tooth refers to the area of ​​the cutting tooth close to the axis of the tool body. The descriptions of "axial cutting edge" and "radial cutting edge" are only for distinguishing the cutting edges at different positions of the thread cutting tooth, and are not restrictions on the direction and shape of the cutting edge. For example, the axial cutting edge can be an arc-shaped transition cutting edge between radial cutting edges.

[0055] During the cutting process of a rotating tool, centrifugal force plays a key role. The shape and position of the independent guide groove in this application can effectively change the fluid flow path on the tool surface, increase the residence time and flow speed of the coolant, and push the coolant to concentrate in the cutting area, helping to "lock" in the coolant and improve its cooling efficiency. Under the guidance of the groove, the coolant can penetrate into the cutting area more effectively, thereby achieving better cooling.

[0056] The cutting interface of thread cutting tools is located inside the material. During high-speed rotary cutting, the existing flow path of the cutting fluid in milling cutters makes it difficult to reach the cutting area, hindering adequate lubrication and cooling, thus affecting the tool's cutting performance. This application effectively prevents tool thermal damage, accelerated wear, and thermal fatigue by incorporating independent guide grooves corresponding to the cutting teeth, thereby significantly extending tool life and enabling the tool to operate at higher machining linear speeds and feed per tooth. Practical experience has shown that this improvement in cooling efficiency can significantly extend tool life by 2 to 4 times, greatly enhancing tool durability.

[0057] The shape and position of an "independent flow channel" in this application are adapted to the cutting edge of a cutting tooth, forming a groove on the rake face, thus providing a relatively "independent" chip space for each cutting tooth. Under centrifugal force, the coolant is "inverted" within the groove and "pressed" towards the cutting edge area through the independent flow channel, preventing coolant loss. Simultaneously, the lubricating effect of the coolant significantly reduces the coefficient of friction, minimizing force and heat accumulation during cutting. Depending on the specific cutting conditions and material properties, a reduced coefficient of friction can typically further extend tool life.

[0058] In this application, cutting fluid and coolant have the same meaning.

[0059] In this application, a groove extends along the entire cutting edge area of ​​the cutting tooth, that is, the groove surface extends from the bottom of the groove to the axial and radial cutting edges, thereby forming an independent guide groove corresponding to the cutting tooth. The extension of the groove surface only needs to guide the cutting fluid to flow to the cutting area. Those skilled in the art can select and set it according to the actual situation when the tool is cutting. For example, the groove surface extends to the cutting edge area so that the cutting width is 0.03mm to 0.2mm, preferably 0.05mm to 0.15mm, preferably 0.08mm to 0.12mm, and preferably 0.05mm to 0.1mm.

[0060] Under high-temperature, high-speed cutting conditions, chips tend to adhere to the tool surface, accelerating tool wear. This application features an independent guide channel that significantly expands the chip space, optimizes chip flow and discharge mechanisms, ensures smooth and efficient chip discharge, reduces the risk of clogging, and improves cutting efficiency and machining continuity. Effective chip discharge not only reduces tool wear but also prevents chips from scratching the tool surface, typically extending tool life by 10% to 30%.

[0061] In addition, the independent guide groove provides extra chip space for the tool, allowing the tool to have a smaller chip groove size, increasing the core thickness of the tool, thus making the tool more rigid, able to withstand higher cutting forces, helping to reduce deformation and vibration, and improve machining stability.

[0062] In some embodiments, the depth of the groove gradually increases with the distance from the cutting edge in the direction perpendicular to the cutting edge, reaching a maximum at the bottom of the groove. This arrangement allows the cutting edge at different positions of the cutting tooth to have a slope extending towards the bottom of the groove, and the cutting fluid can be guided to the cutting edge area by the slope, thereby better enhancing the cooling and lubrication efficiency.

[0063] In some embodiments, the groove extends into the chip removal groove. Extending into the chip removal groove provides a larger chip-holding space and allows for smoother guidance of chips from the cutting area into the chip removal groove. Preferably, the independent guide channel has a concave arc surface, which allows the cutting fluid to remain within the groove during rotary cutting and be guided to the cutting area by centrifugal force.

[0064] In some embodiments, the groove bottom has a maximum depth and is located in the region between two radial cutting edges. This arrangement allows more cutting fluid to remain on the cutting teeth, further enhancing cooling and lubrication efficiency. Preferably, the maximum depth of the groove is 30% to 60% of the tooth pitch, which is the distance between two cutting teeth.

[0065] In some embodiments, the thread cutting tooth has a first rake angle, the groove surface has a face extending near the cutting edge, and the face near the cutting edge forms a second rake angle greater than the corresponding first rake angle. The term "first rake angle" in this application has the same meaning as the commonly used term "rake angle" in the art, and the two are interchangeable. The rake angle is an indicator of tool sharpness, and for thread cutting tools, it is typically measured in a plane perpendicular to the cutting edge. The "second rake angle" in this application refers to the angle formed by the face extending near the cutting edge within the rake angle measurement plane. By setting a second rake angle greater than the corresponding first rake angle, the sharpness of the cutting edge can be improved, cutting resistance reduced, and the coolant can be directly "pressed" towards the cutting edge under centrifugal force, achieving better cooling and lubrication effects. This allows the tool to withstand higher machining speeds and feed per tooth, thereby improving machining efficiency.

[0066] In some embodiments, the grooves on adjacent thread cutting teeth are not interconnected. This arrangement allows for the formation of a raised structure between two cutting teeth when multiple thread cutting teeth have consecutive independent guide grooves, ensuring that the rake face at the junction of two cutting teeth and the corresponding chip removal groove surface remain intact, thus enhancing the overall rigidity of the tool. Furthermore, the non-interconnected grooves form closed, independent guide units, better preventing cutting fluid leakage and guiding it towards the cutting area under centrifugal force.

[0067] In some embodiments, the core thickness of the thread end mill is 60%-85% of the cutter body diameter. The core thickness of the thread end mill is a key factor determining its rigidity and stability. Increasing the core thickness significantly improves the overall structural strength of the tool, giving it greater resistance to bending and vibration under high-speed rotation and cutting forces, ensuring smoothness and accuracy in the machining process. Enhanced core thickness also helps maintain workpiece dimensional stability, improves surface finish, and meets precision machining requirements. Core thickness also directly affects the tool's chip evacuation performance; a relatively smaller core thickness provides more chip space, optimizes chip removal, and reduces the risk of chip buildup and tool clogging. However, too small a core thickness may weaken the tool's rigidity and affect cutting stability. Core thickness also has a significant impact on the tool's wear resistance and durability. Because the independent guide groove on the rake face of the thread cutting tool in this application also serves as a chip-collecting function, it provides additional chip-collecting space for the tool and allows for a larger core thickness, such as 60%-85% or 75%-85% of the tool body diameter. This effectively resists vibration during the cutting process and extends tool life, especially when machining continuously for a long time or processing high-hardness materials.

[0068] In some embodiments, the radial cutting edge has a convex arc-shaped cutting edge segment that originates near the tip of the thread cutting tooth and protrudes in the direction of cutting rotation. For thread cutting tools, the cutting edge is weakest and most prone to chipping near the tip of the cutting tooth. In the prior art, due to manufacturing process limitations, the chip flute is concave arc-shaped, and the radial cutting edge is also set as a concave arc segment in the plane perpendicular to the tool body axis, which is recessed in the direction opposite to the cutting rotation direction. This concave arc cutting edge causes the cutting force to be directed towards the weakest direction of the cutting edge during cutting, making it more prone to chipping. See attached... Figure 13 As shown, this application, by setting a convex arc cutting edge section that protrudes in the cutting rotation direction near the top of the thread cutting tooth, can guide the cutting force to the axis of the tool body, increase the rigidity of the cutting edge, prevent chipping, and enable the tool to withstand higher machining speeds and feeds, thereby improving machining efficiency.

[0069] In some embodiments, the diameter of the cutter body is 0.5 mm to 6 mm, for example 0.6 mm to 5 mm, for example 0.8 mm to 4 mm, for example 1 mm to 3 mm, for example 0.8 mm to 3 mm. Cutters with a cutter body diameter of less than 6 mm are micro-diameter end mills. Due to their small size, their rigidity decreases geometrically. At the same time, the chip flute space is limited, and the heat dissipation channel design in the cutting edge area is insufficient, resulting in the accumulation of cutting heat. Defects such as tool thermal damage, accelerated wear, and thermal fatigue greatly limit the machining performance and machining life of micro-diameter end mills, severely restricting their application in the field of precision manufacturing. The technical improvements of this application are particularly applicable to small micro-diameter end mills.

[0070] In some embodiments, the chip removal groove is a straight groove or a spiral groove extending spirally along the axial direction of the tool body, and the spiral angle of the spiral groove is greater than 0 degrees and less than or equal to 35 degrees.

[0071] This application also discloses a method for preparing a solid carbide thread cutter with an independent guide groove, characterized in that the independent guide groove is prepared by a machining method that does not produce thermal damage.

[0072] In some embodiments, the independent flow channel is fabricated using a femtosecond pulsed laser processing method.

[0073] The method for preparing the integral carbide thread end mill with independent guide grooves as described in this application includes the following steps:

[0074] Chip vents and thread cutting teeth are ground onto the thread milling cutter blank to form the rake face.

[0075] A groove is machined on the rake face using a femtosecond pulsed laser, thereby forming an independent guide groove on the corresponding thread cutting tooth.

[0076] Furthermore, the optimization of the rake face in this application maintains the sharpness of the tool under long-term high-efficiency cutting, reduces frictional resistance, reduces built-up edge formation, extends tool life, and improves the surface quality of the machined part.

[0077] Example

[0078] Example 1

[0079] like Figures 1 to 4 As shown, this embodiment discloses a solid carbide thread end mill with an independent guide groove, characterized in that it includes:

[0080] The blade body 100 is made of a single piece of cemented carbide and has a diameter of 2mm.

[0081] Tool holder 200 for direct or indirect connection to a machine tool

[0082] The cervical neck 300 is used to connect the blade body and the handle.

[0083] The cutter body has five cutting teeth 110 arranged along its circumference, and chip removal grooves 130 are arranged between adjacent cutting teeth. The chip removal grooves are straight grooves.

[0084] Each cutting tooth has three threaded cutting teeth 120 arranged along the axial direction of the tool body. These threaded cutting teeth complete the cutting of the required thread profile through the rotational motion of the tool.

[0085] Each thread cutting tooth independently has a rake face 121, a flank face 122, and a cutting edge 123 formed by the intersection of the rake face and the flank face. The cutting edge includes an axial cutting edge 140 located at the top of the thread cutting tooth, and two radial cutting edges 150 connected to the axial cutting edge and extending towards the bottom of the thread cutting tooth.

[0086] Each thread cutting tooth has a groove 160 on its rake face, the groove having a groove bottom 161 and a groove surface 162 extending from the groove bottom to the axial cutting edge and the radial cutting edge, thereby forming an independent guide groove 10 on the corresponding thread cutting tooth.

[0087] The groove extends into the chip removal groove, and the surface of the groove is a concave arc surface.

[0088] like Figure 4 As shown, the grooves provided on adjacent thread cutting teeth are not interconnected.

[0089] The independent guide channel 10 can guide the coolant along the chip removal channel to the cutting edge, and under the action of centrifugal force, it can be precisely guided to the cutting core area, which can significantly improve the cooling efficiency, effectively prevent tool thermal damage, accelerated wear and thermal fatigue, and greatly extend the tool service life.

[0090] Example 2

[0091] like Figures 5 to 7 As shown, this embodiment discloses a solid carbide thread end mill with an independent guide groove, characterized in that it includes:

[0092] The blade body 100 is made of a single piece of cemented carbide and has a diameter of 2mm.

[0093] A tool holder for direct or indirect connection to a machine tool, and a tool neck for connecting the tool body and the tool holder. The structure of the tool holder and the tool neck is the same as in Embodiment 1, and is not shown in the figure.

[0094] The cutter body has five cutting teeth 110 arranged along its circumference, and chip removal grooves 130 are arranged between adjacent cutting teeth. The chip removal grooves are spiral grooves with a spiral angle of 10 degrees.

[0095] Each cutting tooth has three threaded cutting teeth 120 arranged along the axial direction of the tool body. These threaded cutting teeth complete the cutting of the required thread profile through the rotational motion of the tool.

[0096] Each thread cutting tooth independently has a rake face 121, a flank face 122, and a cutting edge 123 formed by the intersection of the rake face and the flank face. The cutting edge includes an axial cutting edge 140 located at the top of the thread cutting tooth, and two radial cutting edges 150 connected to the axial cutting edge and extending towards the bottom of the thread cutting tooth.

[0097] Each thread cutting tooth has a groove 160 on its rake face, the groove having a groove bottom 161 and a groove surface 162 extending from the groove bottom to the axial cutting edge and the radial cutting edge, thereby forming an independent guide groove 10 on the corresponding thread cutting tooth.

[0098] The groove extends into the chip removal groove, and the surface of the groove is a concave arc surface.

[0099] Figure 7 This is a partial enlarged view of the independent guide groove. The figure shows a vertical line perpendicular to the axial cutting edge and six vertical lines perpendicular to the radial cutting edge. In the direction perpendicular to the cutting edge, that is, in the direction indicated by the arrow in the figure, the depth of the groove gradually increases with the distance from the cutting edge and reaches a maximum value at the bottom of the groove, that is, at the bottom of the groove 161 shown in the figure.

[0100] like Figure 7 As shown, the grooves provided on adjacent thread cutting teeth are not interconnected.

[0101] The independent guide channel 10 can guide the coolant along the chip removal channel to the cutting edge, and under the action of centrifugal force, it can be precisely guided to the cutting core area, which can significantly improve the cooling efficiency, effectively prevent tool thermal damage, accelerated wear and thermal fatigue, and greatly extend the tool service life.

[0102] Cutting Experiment 1

[0103] Cutting tests were conducted using the cutting tools from Examples 1 and 2 of this application. The workpiece being cut was a mold. The material was x38CrMo16, with a hardness of HRC60. The threaded hole had an M6 diameter and a depth of 10 mm. The machine tool used was a domestically produced vertical machining center, and the machining method was milling. Tool life (expressed as the number of threaded holes machined) and surface roughness were measured. The thread milling cutter in Comparative Example 1 has the same structure as that in Example 2, except that it does not have a groove. The machining test results are shown in Table 1 below.

[0104] Table 1

[0105] VC linear velocity (m / s) 60 60 30 Fz feed per tooth (mm) 0.02 0.03 0.02 Tool life (per tool) 200 300 100 Surface roughness Ra (μm) 1.6 1.6 3.2

[0106] The cutting test data above show that, by adopting the technical solution of this application, the tool life is increased by 2 to 3 times compared with traditional tools at higher machining speeds, and the surface quality of the workpiece is significantly improved.

[0107] Example 3

[0108] like Figures 8 to 10 As shown, this embodiment discloses a solid carbide thread end mill with an independent guide groove, characterized in that it includes:

[0109] The blade body 100 is made of a single piece of cemented carbide and has a diameter of 8mm.

[0110] Tool holder 200 for direct or indirect connection to a machine tool

[0111] The cervical neck 300 is used to connect the blade body and the handle.

[0112] The cutter body has four cutting teeth 110 arranged along its circumference, and a chip removal groove 130 is arranged between adjacent cutting teeth. The chip removal groove is a spiral groove with a spiral angle of 8 degrees.

[0113] The cutting teeth 110 have multiple threaded cutting teeth 120 arranged along the axial direction of the tool body. The threaded cutting teeth complete the cutting of the required thread profile through the rotational motion of the tool.

[0114] Each thread cutting tooth independently has a rake face, a flank face, and a cutting edge 123 formed by the intersection of the rake face and the flank face. The cutting edge includes an axial cutting edge 140 located at the top of the thread cutting tooth, and two radial cutting edges 150 connected to the axial cutting edge and extending towards the bottom of the thread cutting tooth.

[0115] The thread cutting tooth has a groove 160 on its rake face. Figure 9 The groove extends into the chip removal groove 130. The groove has a bottom 161 and a groove surface 162 extending from the bottom towards the axial and radial cutting edges, thereby forming an independent guide groove 10 on the corresponding thread cutting tooth. The grooves on adjacent thread cutting teeth are not interconnected.

[0116] The thread cutting tooth has a first rake angle, and the groove surface has a face 163 extending to near the cutting edge, the face near the cutting edge forming a second rake angle greater than the corresponding first rake angle. Figure 10 A schematic diagram of a first rake angle and a second rake angle measured in a plane perpendicular to the radial cutting edge is shown. The first rake angle α is formed by the rake face 121, and the second rake angle β is formed by the face 163 extending to the edge. By setting a second rake angle that is larger than the corresponding first rake angle, the sharpness of the cutting edge can be improved, the cutting resistance can be reduced, and the coolant can be directly "pressed" onto the cutting edge under the action of centrifugal force, thereby achieving a better cooling and lubrication effect.

[0117] Example 4

[0118] This embodiment discloses another integral carbide thread end mill with an independent guide groove. Its structure is basically the same as that of embodiment 3. The difference is that the radial cutting edge 150 has a convex arc cutting edge segment 170 that protrudes in the cutting rotation direction from near the top of the thread cutting tooth. Figure 11This is a 3D view of the thread milling cutter. Figure 12 for Figure 11 A magnified view of the cutting teeth within the dashed box. Figure 13 The dashed arrow on the left indicates Figure 12 A schematic diagram of the cutting force direction when the convex arc cutting edge section 170 is set on the intermediate thread cutting tooth. Figure 13 The dashed arrow on the right shows a schematic diagram of the cutting force direction when the thread cutting tooth is equipped with a concave arc cutting edge. It can be seen that the concave arc cutting edge will guide the force towards the weak direction of the cutting edge during cutting, making it more prone to chipping. However, by setting a convex arc cutting edge section 170 at the top of the cutting tooth that protrudes in the direction of cutting rotation, the cutting force can be directed to the axis of the tool body, increasing the rigidity of the cutting edge and preventing chipping.

[0119] Cutting Experiment 2

[0120] Cutting tests were conducted using the cutting tools from Examples 3 and 4 of this application. The workpiece being cut was a machine housing. The material was GH3625 stainless steel, with M8*1.25-H6 threaded holes and a machining depth of 15 mm. An imported horizontal five-axis machining center was used, and milling was performed. Tool life (expressed as the number of threaded holes machined) and surface roughness were measured. The thread milling cutter in Comparative Example 2 has the same structure as that in Example 3, except that it does not have grooves. The machining test results are shown in Table 2 below.

[0121] Table 2

[0122] VC linear velocity (m / s) 50 50 20 Fz feed per tooth (mm) 0.03 0.03 0.02 Tool life (per tool) 350 400 100 Surface roughness Ra (μm) 1.6 1.6 1.6

[0123] The cutting test data above show that, with the technical solution of this application, the tool can withstand higher machining line speeds and feed per tooth, significantly improving machining efficiency. Furthermore, under high-efficiency machining conditions, the workpiece surface quality meets machining requirements, and the tool life is increased by 3.5 to 4 times compared to traditional tools, greatly enhancing the tool's durability and providing solid technical support for high-efficiency and high-precision thread machining.

[0124] The above description is merely an exemplary embodiment of this disclosure and is not intended to limit the scope of protection of this disclosure, which is determined by the appended claims.

Claims

1. A solid carbide thread end mill with independent guide grooves, characterized in that, include: The blade body is made of a single piece of cemented carbide. Tool holders used for direct or indirect connection to machine tools The blade neck is used to connect the blade body and the handle. The tool body is provided with multiple cutting teeth, and chip removal grooves are provided between adjacent cutting teeth. Each cutting tooth has one or more thread cutting teeth, which complete the cutting of the required thread profile through the rotational motion of the tool. Each thread cutting tooth independently has a rake face, a flank face, and a cutting edge formed by the intersection of the rake face and the flank face. The cutting edge includes an axial cutting edge located at the top of the thread cutting tooth, and two radial cutting edges connected to the axial cutting edge and extending towards the bottom of the thread cutting tooth. At least some of the thread cutting teeth have grooves on their rake faces, the grooves having a bottom and a groove surface extending from the bottom to the axial and radial cutting edges, thereby forming an independent guide groove on the corresponding thread cutting teeth.

2. The integral carbide thread cutter with independent guide grooves according to claim 1, characterized in that, In the direction perpendicular to the cutting edge, the depth of the groove gradually increases with the distance from the cutting edge and reaches its maximum value at the bottom of the groove.

3. The integral carbide thread cutter with independent guide grooves according to claim 1, characterized in that, The groove extends into the chip removal groove.

4. The integral carbide thread cutter with independent guide grooves according to claim 1, characterized in that, The groove bottom has a maximum depth of groove, and the groove bottom is located in the area between two radial cutting edges.

5. The integral carbide thread cutter with independent guide grooves according to claim 1, characterized in that, The thread cutting tooth has a first rake angle, the groove surface has a surface extending to near the cutting edge, and the surface near the cutting edge forms a second rake angle greater than the corresponding first rake angle.

6. The integral carbide thread cutter with independent guide grooves according to claim 1, characterized in that, The grooves provided on adjacent thread cutting teeth are not interconnected.

7. The integral carbide thread cutter with independent guide grooves according to claim 1, characterized in that, The core thickness of the thread milling cutter is 60%-85% of the cutter body diameter.

8. The integral carbide thread cutter with independent guide grooves according to claim 1, characterized in that, The radial cutting edge has a convex arc cutting edge segment that originates near the tip of the thread cutting tooth and protrudes in the direction of cutting rotation.

9. The integral carbide thread cutter with independent guide grooves according to claim 1, characterized in that, The diameter of the blade is 0.5 mm to 6 mm.

10. The integral carbide thread cutter with independent guide grooves according to claim 1, characterized in that, The chip removal groove is a straight groove or a spiral groove extending spirally along the axial direction of the tool body, and the spiral angle of the spiral groove is greater than 0 degrees and less than or equal to 35 degrees.

11. The integral carbide thread cutter with independent guide grooves according to claim 1, characterized in that, The diameter of the blade is 0.6 mm to 5 mm.

12. The integral carbide thread cutter with independent guide grooves according to claim 1, characterized in that, The diameter of the blade is 0.8 mm to 4 mm.

13. The integral carbide thread cutter with independent guide grooves according to claim 1, characterized in that, The diameter of the blade is 1mm to 3mm.

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