Cutting tool with cooling flow channel

Abstract

The invention discloses a cutting tool with a cooling runner, which belongs to the technical field of metal cutting tools and comprises a tool body, a blade and a screw. A cutter groove, a mounting hole and an inner hole are sequentially formed in the cutter body. The blade is provided with a center hole and matched with the cutter groove. The screw penetrates through the center hole and is matched with the mounting hole, and a flow channel communicated with the inner hole is formed among the screw, the mounting hole and the center hole. Through the assembly relationship among the screw, the mounting hole and the blade center hole, a gap runner communicated with the inner hole is naturally formed, so that a cooling medium can be directly conveyed to a blade area from the inside of the cutter body. The flow channel is not formed through additional machining, but is constructed by depending on the gap characteristic of the assembly structure, so that a cooling path with a self-adaptive structure is formed.

Description

Technical Field

[0001] This invention belongs to the field of metal cutting tool technology, specifically a cutting tool with cooling channels. Background Technology

[0002] In the field of metal cutting, cutting cooling media mainly penetrate into the friction gap between the tool, chips and workpiece through pressure. On the one hand, it reduces interface friction and tool adhesion wear. On the other hand, it quickly removes a large amount of heat from the cutting zone through convection heat transfer, reducing the temperature of the tool and workpiece. At the same time, it removes chips in time by flowing and flushing to prevent secondary scratches, and forms a protective layer on the metal surface to inhibit corrosion. It improves cutting conditions, enhances machining quality and tool life from multiple aspects such as lubrication, cooling, chip removal and rust prevention.

[0003] Currently, the cooling holes configured on conventional cutting tools are mostly fixed structures. The spray path and action area of ​​the cooling holes can only correspond to the tip of the tool under a specific assembly position. When the cutting tool is replaced, the spray target of the cooling holes cannot be adapted to the new cutting area of ​​the cutting tip in a synchronous manner. It is difficult to achieve precise supply of cooling medium to the cutting tip, thereby weakening the cooling and lubrication effect and failing to guarantee the stability of the cutting conditions.

[0004] During the cutting process, the structure of spraying cooling medium in a single fixed direction has a limited action path. This single jet is difficult to continuously and directly act on the actual cutting contact area between the tool and the workpiece. The continuous generation of chips and splashing can easily form a physical barrier to the jet, which prevents the cooling medium from effectively penetrating to the friction and high-temperature core area, reducing the utilization efficiency of the cooling and lubrication medium, and at the same time aggravating the risk of tool wear and thermal damage.

[0005] A unidirectional cooling medium jet lacks the ability to provide omnidirectional shielding and wide-area scouring, and cannot effectively intercept irregularly splashed chips during the cutting process. Some chips will still impact and adhere to the blade surface, which not only easily causes physical scratches and structural damage to the wear-resistant and heat-resistant coatings on the blade surface, but also accelerates the degradation of blade performance, directly shortens the service life of the blade, and affects the machining accuracy and surface quality of the workpiece.

[0006] If an internal cooling structure with built-in cooling channels is adopted, on the one hand, the effective load-bearing cross-sectional area and overall structural strength of the blade body will be greatly reduced, and failure modes such as deformation and breakage will easily occur. On the other hand, the forming process of this type of structure is complex and the processing difficulty is extremely high, which significantly increases the cost of large-scale production. Summary of the Invention

[0007] The purpose of this invention is to provide a cutting tool with a cooling channel to solve the problems mentioned in the prior art.

[0008] A cutting tool with cooling channels is provided, comprising: The cutter body has a cutter groove, a mounting hole and an inner hole formed in sequence; The blade has a central hole and fits into the blade groove. A screw that passes through a central hole and mates with a mounting hole forms a flow channel that communicates with the inner hole between the screw, the mounting hole, and the central hole.

[0009] As a further aspect of the present invention: the inner hole includes a liquid inlet channel and a cavity that are sequentially connected along the flow direction of the cooling medium, and the cavity is located at the end of the mounting hole away from the blade groove.

[0010] As a further aspect of the present invention, an arc-shaped flow guide surface is formed on the side of the cavity away from the mounting hole.

[0011] As a further aspect of the present invention, a plug is provided on the side of the blade body located away from the mounting hole in the cavity.

[0012] As a further aspect of the present invention: the tail of the screw is threaded into the mounting hole, and the tail and / or the mounting hole are recessed inward to form a plurality of first flow channels.

[0013] As a further aspect of the present invention: the screw includes a head and a tail, and the head and / or the central hole are recessed inward to form a plurality of second flow channels.

[0014] As a further aspect of the present invention: the head is formed with a thrust surface that contacts the wall of the central hole, and a first annular groove and a second annular groove are formed on both sides of the head between the thrust surface and the central hole, respectively.

[0015] As a further aspect of the present invention: the second flow channel is formed by the head being recessed inward, and the width and depth of the downstream region of the second flow channel, bounded by the thrust surface, gradually decrease.

[0016] As a further aspect of the present invention: the head extends radially outward to form a guide edge, and a third annular groove communicating with the second annular groove is formed between the guide edge and the end face of the blade.

[0017] As a further aspect of the present invention: the corner area between the guide edge and the head forms an arc transition, and the corner area between the end face and the center hole forms an arc transition.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the assembly relationship between screws, mounting holes, and the center hole of the cutting tool, a gap channel is naturally formed that connects the inner hole, allowing the cooling medium to be directly delivered from inside the tool body to the cutting tool area. This channel is not formed through additional machining, but rather relies on the gap characteristics of the assembly structure itself, thus forming a structurally adaptive cooling path.

[0019] 2. After entering through the inner bore of the cutting tool body, the cooling medium flows along the gap between the outer circumference of the screw and the mounting hole and center hole, eventually reaching the area near the cutting tool. Because the cutting tool is fixed by the screw, the position of the cutting tool and the outlet of the flow channel always remain relatively consistent. Even if the cutting tool is replaced or the mounting position is adjusted, the cooling medium can still be delivered to the new cutting tip position along the same structural path, achieving direct action on the actual cutting area.

[0020] 3. This structure avoids opening cooling holes inside the blade, which preserves the integrity of the blade's structure and reduces processing complexity and cost. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is one of the overall structural schematic diagrams of the cutting tool of the present invention; Figure 2 for Figure 1 Enlarged view of region A in the middle; Figure 3 This is a partial structural schematic diagram of the cutting tool of the present invention; Figure 4 This is the second schematic diagram of the overall structure of the cutting tool of the present invention; Figure 5 This is a diagram showing the working state of the cutting tool of the present invention.

[0023] In the diagram: 1. Blade body; 11. Blade groove; 12. Mounting hole; 13. Inner hole; 131. Liquid inlet channel; 132. Cavity; 133. Arc-shaped guide surface; 2. Blade; 21. Center hole; 22. End face; 3. Screw; 31. Head; 311. Thrust surface; 32. Tail; 33. Guide edge; 4. Flow channel; 41. First flow channel; 42. Second flow channel; 51. First annular groove; 52. Second annular groove; 53. Third annular groove; 6. Plug. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0025] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0026] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0027] Please see Figures 1-3 and Figure 5 As shown in the embodiment of the present invention, a cutting tool with a cooling channel includes a tool body 1, an insert 2, and a screw 3. The tool body 1 is sequentially formed with a groove 11, a mounting hole 12, and an inner hole 13. The insert 2 has a central hole 21 and mates with the groove 11. The screw 3 passes through the central hole 21 and mates with the mounting hole 12. A cooling channel 4 communicating with the inner hole 13 is formed between the screw 3, the mounting hole 12, and the central hole 21.

[0028] After the tool is assembled, the screw 3 passes through the central hole 21 of the blade 2 and is threaded into the mounting hole 12 of the tool body 1, thereby naturally forming continuous micro-gaps between the outer wall of the screw 3 and the inner wall of the mounting hole 12, and between the outer wall of the screw 3 and the inner wall of the central hole 21. These gaps are spatially interconnected and further connected to the inner hole 13 inside the tool body 1 for supplying cooling medium, thus constructing a flow channel 4 for conveying cooling medium.

[0029] It should be noted that the cooling medium can be liquid, oil mist, gas, etc.

[0030] In a typical embodiment, the external cooling medium first enters the inner hole 13 of the tool body 1 under pressure and flows along the inner hole 13 towards the mounting hole 12 region. When the cooling medium reaches the connection position between the tail 32 of the screw 3 and the mounting hole 12, it begins to enter the transition region formed by the gap and is conveyed along the outer periphery of the screw 3 towards the blade 2. After the cooling medium is conveyed along the gap of the screw 3 to the position of the center hole 21, it overflows outward through the gap between the screw 3 and the center hole 21. Since there is a fixed spatial relationship between the cutting edge of the blade 2 and the center hole 21, after the cooling medium is released at this position, it can diffuse along the surface of the blade 2 towards the cutting edge, and further penetrate into the actual contact area between the tool, workpiece and chips during the cutting process with the help of cutting force, airflow and interface pressure, thereby directly acting on the real cutting area to achieve cooling, lubrication and chip removal of the high-temperature friction interface.

[0031] Furthermore, since the flow channel 4 is entirely dependent on the assembly structure of the screw 3 and the insert 2, when the insert 2 is replaced, the positional relationship between the central hole 21 and the screw 3 remains consistent, and the outlet position of the flow channel 4 also remains the same. This ensures that the cooling medium can always act on the new cutting area of ​​the tool tip, avoiding the problem of the spray position shifting after the insert 2 is replaced, which is common with traditional fixed cooling holes. At the same time, this structure eliminates the need for cooling holes inside the insert 2, effectively avoiding the risk of weakening the cross-section and reducing the strength of the insert 2, achieving efficient cooling while ensuring structural reliability.

[0032] Specifically, the inner hole 13 includes an inlet channel 131 and a cavity 132 connected sequentially along the flow direction of the cooling medium. The cavity 132 is located at the end of the mounting hole 12 away from the cutter groove 11. When the cooling medium enters through the inlet channel 131, it typically has a high flow velocity. When it enters the cavity 132, which has a relatively larger cross-sectional area, the fluid velocity decreases rapidly, and some of the kinetic energy is converted into static pressure, thereby stabilizing the flow. At the same time, the cavity 132 provides a relatively open buffer space, which can effectively reduce the turbulence, pulsation, or local eddies generated when the fluid enters the cutter body, making the fluid pressure distribution more uniform.

[0033] Based on this, when the cooling medium, after being rectified by cavity 132, enters the gap channel between screw 3 and mounting hole 12 and center hole 21, it can be distributed more stably and uniformly around screw 3, avoiding problems such as excessive local flow velocity, uneven distribution, or increased turbulence caused by direct high-speed entry into corners and narrow gaps. This stable liquid supply state facilitates the continuous delivery of the cooling medium along the gap to the blade 2 area, and its subsequent uniform release from near center hole 21.

[0034] In some embodiments, an arc-shaped guide surface 133 is provided at the end of the cavity 132 to guide the direction and optimize the flow of the cooling medium before it enters the gap channel of the screw 3. Since the cooling medium needs to turn from the cavity 132 into the circumferential gap of the screw 3, if this turning process is not handled properly, turbulence or local energy loss can easily occur.

[0035] Therefore, the arc-shaped guide surface 133 allows the cooling medium to gradually change its flow direction along the smooth curved surface, transitioning from axial flow to circumferential distribution, thus entering the gap area between the screw 3 and the mounting hole 12 more smoothly. This not only improves the efficiency of fluid entering the gap channel but also reduces flow losses.

[0036] In some embodiments, please refer to Figure 4 As shown, during the machining process of the tool body 1, one end of the cavity 132 is extended to the outside, which can significantly reduce the machining difficulty of the inner cavity, making it easier to use conventional processes such as drilling and boring to shape the cavity 132. It also facilitates subsequent cleaning, repair or removal of machining residues inside the cavity 132, thereby improving the feasibility and reliability of manufacturing and maintenance.

[0037] Therefore, in actual use, the through-hole is sealed by the plug 6. When the plug 6 closes the through-hole, the cavity 132 can be sealed into a controlled internal fluid space, so that the cooling medium cannot leak in that direction after entering the cavity 132, but is forced to enter the assembly gap flow channel between the screw 3 and the mounting hole 12 and the center hole 21 along a predetermined path.

[0038] In one specific embodiment, the plug 6 is preferably threaded to the through-hole, thereby ensuring both the sealing of the connection and its detachability. The diameter of the threaded end of the plug 6 is larger than the diameter of the cavity 132, and the threaded end thrust creates a self-locking thread.

[0039] In some embodiments, please refer to Figure 1 and Figure 4 As shown, the arc-shaped flow guide surface 133 is formed on the threaded end face of the plug 6, so that the plug 6 has both sealing capability and provides fluid guidance and flow optimization capability for the cavity 132.

[0040] Specifically, a first flow channel 41 is constructed in the threaded engagement area between the tail 32 of the screw 3 and the mounting hole 12, so that the cooling medium can pass smoothly through the originally relatively closed threaded connection interface and further enter the gap flow channel formed between the screw 3 and the center hole 21.

[0041] Furthermore, the first flow channel 41 can be formed by an inward recess on the outer surface of the screw 3, or by a partial recess on the inner wall of the mounting hole 12, or by the screw 3 and the mounting hole 12 together.

[0042] In one embodiment, preferably, a plurality of axially extending groove structures are formed on the body of the screw 3. After the screw 3 is screwed into the mounting hole 12, these grooves, together with the threaded engagement structure, form a continuous fluid passage, thereby breaking the obstruction effect of the threaded connection on the fluid and enabling the cooling medium to be stably transported along the axial direction of the screw 3.

[0043] In its specific operation, the cooling medium enters through the inner hole 13 and first reaches the tail 32 region of the screw 3, then enters the threaded connection interface through the first flow channel 41. Guided by the first flow channel 41, the cooling medium is transported along the axial direction of the screw 3. Since the first flow channel 41 is distributed circumferentially along the screw 3, the cooling medium is already distributed in multiple points when entering the upstream gap, which is beneficial for forming a more uniform liquid supply effect in the blade 2 region.

[0044] Furthermore, the first flow channel 41 is preferably set on the screw body 3 rather than enlarging the mounting hole 12 structure. On the one hand, the flow channel can be constructed without changing the inner diameter of the mounting hole 12, so that the size of the center hole 21 of the blade 2 does not need to be enlarged accordingly, thus avoiding weakening the effective bearing section of the blade 2 and the blade body 1. On the other hand, this structure can still maintain the basic locking function of the thread, ensuring the reliability and stability of the blade 2 clamping.

[0045] In one embodiment, a threaded mating surface is formed between the screw 3 and the mounting hole 12, and the first flow channel 41 is formed by a channel that runs through the inside of the screw 3. The channel extends from the end face of the tail 32 of the screw 3 to the area between the tail 32 and the head 31, allowing the cooling medium to be input from inside the screw 3 and output from multiple through holes circumferentially through the screw 3.

[0046] However, it should be noted that the present invention provides preferred arrangements for the first flow channel 41, but does not represent the only limitation on the structure of the first flow channel 41. Provided that the function of forming a channel structure for the flow of cooling medium is met, multiple location selection schemes for the first flow channel 41 are all within the protection scope of this application.

[0047] Specifically, a second flow channel 42 is provided at the head 31 of the screw 3 or the central hole 21 of the blade 2, so that the cooling medium can be effectively released and diffused outward in the area near the blade 2 after being axially transported by the screw 3. The second flow channel 42 can be formed by an inward recess of the head 31 of the screw 3, or by a partial recess of the inner wall of the central hole 21, or by the head 31 and the central hole 21 together.

[0048] In its specific operation, the cooling medium first enters through the inner hole 13, passes through the threaded connection area via the first flow channel 41, and enters the annular gap between the screw 3 and the central hole 21. When the cooling medium is delivered to the head 31 region, it can be discharged from the originally relatively closed contact interface through the second flow channel 42 provided on the head 31, and released towards the outside of the blade 2 along these grooves. Since the second flow channel 42 is distributed circumferentially along the head 31, the cooling medium is dispersed at multiple points during release, which is conducive to forming a uniform fluid distribution around the central hole 21, providing a good foundation for subsequent diffusion to the cutting edge region.

[0049] In one embodiment, the second flow channel 42 is preferably located at the head 31, rather than being structurally modified on the central hole 21. This avoids reducing the material of the blade 2 body, thus ensuring the overall strength and impact resistance of the blade 2; it also concentrates the flow channel structure on the reusable screw 3 component, which is beneficial for manufacturing and maintenance.

[0050] Furthermore, the head 31 has a thrust surface 311 that contacts the wall of the central hole 21, and a first annular groove 51 and a second annular groove 52 are formed on both sides of the head 31 between the thrust surface 311 and the central hole 21, respectively.

[0051] In actual operation, after the screw 3 is tightened, the thrust surface 311 of the head 31 comes into contact with the wall of the central hole 21, thereby achieving axial clamping and positioning of the blade 2. The presence of the thrust surface 311 creates a relatively sealed state in the contact area, preventing the cooling medium from directly and disorderly dissipating when it reaches this area through the second flow channel 42. Instead, the medium is confined within the space on both sides of the thrust surface 311. Consequently, a first annular groove 51 and a second annular groove 52 are formed on the upper and lower sides of the thrust surface 311, respectively. These two annular spaces provide a circumferentially expanding flow channel for the cooling medium.

[0052] More specifically, after the cooling medium enters this region through the second flow channel 42, it first enters the first annular groove 51 and diffuses circumferentially within it. Subsequently, it can further enter the second annular groove 52 on the other side and be released outwards. Because the second annular groove 52 has a semi-closed annular structure, the cooling medium is no longer confined to a local outlet but forms a continuous annular distribution around the central hole 21, allowing the cooling medium to be radially output from the blade 2 from multiple directions. This flow pattern, changing from point-like release to annular distribution, effectively overcomes the limitations of traditional unidirectional liquid supply and improves the coverage and uniformity of the cooling medium over the cutting area.

[0053] Furthermore, the first annular groove 51 also has a certain liquid storage and buffering function, which redistributes the water flow when the multiple first flow channels 41 in the circumferential direction of the tail 32 have not formed a sufficiently stable and uniform flow area, thereby improving the stability of the cooling system. The combination structure of the thrust surface 311 and the annular groove also avoids complex machining of the blade 2 body. All flow channel structures are integrated into the screw 3 component, which ensures the structural strength of the blade 2 while achieving efficient distribution of the cooling medium in the blade 2 area.

[0054] In some embodiments, the second flow channel 42 is formed only by the inward indentation of the head 31, and the width and depth of the downstream region of the second flow channel 42 bounded by the thrust surface 311 gradually decrease. By having a gradually contracting shape in the downstream region outside the thrust surface 311, a fluid channel with a jet-enhancing effect is formed.

[0055] Specifically, in actual operation, the cooling medium enters the gap between the tail section 32 and the mounting hole 12 through the first flow channel 41, and then further reaches the head section 31 region through the second flow channel 42, where it achieves initial circumferential distribution in the annular grooves on both sides of the thrust surface 311. As the cooling medium continues to flow outward along the second flow channel 42, the effective flow cross-sectional area gradually shrinks due to the gradual decrease in width and depth of the downstream region of the second flow channel 42 bounded by the thrust surface 311, thereby increasing the flow velocity and forming a jet with high kinetic energy in the outlet region.

[0056] Furthermore, this gradually contracting flow channel structure is equivalent to forming an annular nozzle effect based on the distribution of the second annular groove 52. This causes the cooling medium, which originally diffused at a relatively low speed within the second annular groove 52, to be accelerated after passing through the contraction section and released to the outside of the blade 2 in a more concentrated and impactful manner. This high-speed jet can more effectively penetrate the chip shielding generated during the cutting process, allowing the cooling medium to directly reach the actual contact area between the tool and the workpiece, thereby improving the cooling medium's ability to act on the high-temperature friction interface.

[0057] Furthermore, the converging flow channel can improve the directional stability of the cooling medium to a certain extent, giving it a more defined flow direction during release, thereby improving fluid utilization efficiency. Through this structural design, the cooling medium not only forms a circumferential distribution around the blade 2, but also possesses enhanced jetting capabilities, enabling the cooling medium to have a stronger scouring and cooling effect while covering the cutting area.

[0058] In some embodiments, a guide edge 33 extending radially outward is provided on the head 31 of the screw 3, and a third annular groove 53 communicating with the second annular groove 52 is formed between the guide edge 33 and the end face 22 of the blade 2, thereby constructing a cooling distribution system that combines an annular reversing flow channel and a boundary guiding structure. The core of this structure lies in defining and guiding the flow boundary of the cooling medium through the guide edge 33, so that the cooling medium forms a flow path that is sprayed from the inside out around the blade 2.

[0059] In the specific process, the cooling medium reaches the second annular groove 52 region through the second flow channel 42 and achieves initial circumferential distribution in the second annular groove 52. On this basis, as the cooling medium continues to diffuse outward, it is blocked by the axial and guided by the guide edge 33, so that the cooling medium is constrained in the space between the guide edge 33 and the end face 22, and a continuous third annular groove 53 flow region is formed along this space.

[0060] Furthermore, the third annular groove 53 is connected to the second annular groove 52, enabling the cooling medium to be continuously transferred and redistributed between the changing annular regions, thus forming an annular liquid supply structure that expands step by step from the inside out. Through this structural design, the cooling medium is no longer limited to a single local outlet, but forms a larger circumferential coverage around the central hole 21 and the outer region, allowing the cooling medium to approach the cutting edge of the blade 2 and the surrounding area from multiple directions.

[0061] In one specific embodiment, the corner area between the guide edge 33 and the head 31 forms an arc transition, and the corner area between the end face 22 and the center hole 21 forms an arc transition.

[0062] From a fluid dynamics perspective, the cooling medium needs to pass through a structural transition area as it flows from the second annular groove 52 into the third annular groove 53. If the corner is a right angle or a sharp angle, the cooling medium is prone to flow separation, local eddies, and energy loss, leading to velocity fluctuations, pressure unevenness, and turbulent flow paths. By setting an arc-shaped transition in the critical corner area, the flow channel boundary can be changed from an abrupt change to a continuous gradual change, allowing the cooling medium to smoothly change direction along the arc surface during flow. This reduces flow resistance, lowers the possibility of turbulence, and improves the continuity and stability of the overall flow. This smooth transition helps maintain the effective flow of the cooling medium in the annular groove and guide structure, enabling the cooling medium to be more evenly distributed and stably delivered to the cutting area of ​​the blade 2.

[0063] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A cutting tool with cooling channels, characterized in that, include: The blade body (1) has a blade groove (11), a mounting hole (12) and an inner hole (13) formed sequentially. The blade (2) has a central hole (21) and the blade (2) is fitted with the groove (11); The screw (3) passes through the central hole (21) and mates with the mounting hole (12). A flow channel (4) communicating with the inner hole (13) is formed between the screw (3), the mounting hole (12), and the central hole (21).

2. A cutting tool with cooling channels according to claim 1, characterized in that, The inner hole (13) includes a liquid inlet channel (131) and a cavity (132) connected sequentially along the flow direction of the cooling medium. The cavity (132) is located at the end of the mounting hole (12) away from the knife groove (11).

3. A cutting tool with cooling channels according to claim 2, characterized in that, An arc-shaped guide surface (133) is formed on the side of the cavity (132) away from the mounting hole (12).

4. A cutting tool with cooling channels according to claim 2, characterized in that, A plug (6) is provided on the side of the cutter body (1) away from the mounting hole (12) in the cavity (132).

5. A cutting tool with cooling channels according to claim 1, characterized in that, The tail (32) of the screw (3) is threaded to the mounting hole (12), and the tail (32) and / or the mounting hole (12) are recessed inward to form several first flow channels (41).

6. A cutting tool with cooling channels according to claim 1, characterized in that, The screw (3) includes a head (31) and a tail (32), with the head (31) and / or the central hole (21) recessed inward to form several second flow channels (42).

7. A cutting tool with cooling channels according to claim 6, characterized in that, The head (31) has a thrust surface (311) that contacts the wall of the central hole (21). The head (31) forms a first annular groove (51) and a second annular groove (52) on both sides of the thrust surface (311) and between the head (31) and the central hole (21).

8. A cutting tool with cooling channels according to claim 7, characterized in that, The second flow channel (42) is formed by the inward indentation of the head (31), and the width and depth of the downstream region of the second flow channel (42) bounded by the thrust surface (311) gradually decrease.

9. A cutting tool with cooling channels according to claim 7, characterized in that, The head (31) extends radially outward to form a guide edge (33), and a third annular groove (53) communicating with the second annular groove (52) is formed between the guide edge (33) and the end face (22) of the blade (2).

10. A cutting tool with cooling channels according to claim 9, characterized in that, The corner area between the guide edge (33) and the head (31) forms an arc transition, and the corner area between the end face (22) and the center hole (21) forms an arc transition.

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