Cutting tool with in-process cooling structure

Abstract

This invention discloses a cutting tool with an internal cooling structure, including a tool holder, a nozzle, and an insert. The insert is located at one end of the tool holder. The tool holder has a first cooling channel inside. The nozzle has a second cooling channel connected to the first cooling channel, and the connection between the first and second cooling channels is a planar seal. The second cooling channel includes a fluid discharge hole, which is positioned opposite to the insert. A tensioning component is disposed on the bottom surface of the nozzle, capable of engaging with the insert hole, and the tensioning component contacts the insert surface. A bolt through-hole perpendicular to the bottom surface is disposed between the front and rear ends of the nozzle. The nozzle can be fixed to the tool holder by passing a bolt through the bolt through-hole. This invention provides dual locking of the insert through both upward pressure and internal pull, improving the insert's installation accuracy, stabilizing the clamping force, maintaining long-term accuracy during cutting, and withstanding large cutting depths, thus improving machining efficiency. Furthermore, the overall structure is simple, space-saving, and has a wide range of applications.

Description

Technical Field

[0001] This invention relates to the field of cutting tool technology, and in particular to cutting tools with internal cooling structures. Background Technology

[0002] As China's manufacturing industry becomes more sophisticated and automated equipment becomes more mature, there are now significant challenges in unmanned, automated production lines for turning and milling, stemming from the long-term operational stability of the equipment.

[0003] To achieve optimal cutting performance, a high-pressure cooling medium must be precisely sprayed onto the cutting area to break long chips into shorter ones and ensure their timely removal. This necessitates the use of tool holders and tool supports with precise internal cooling.

[0004] To effectively handle chip removal, a high-pressure cooling medium needs to be precisely sprayed onto the cutting area to break long chips into shorter ones. The high-pressure cooling medium then forces the chips out smoothly and promptly.

[0005] To ensure stable tool operation throughout its lifespan, the first key point is to guarantee that the cooling medium is sprayed onto the tool tip at the same pressure and flow rate during each cut. This ensures stable operating conditions, improves tool life stability, and ultimately extends tool life. Conversely, using external cooling or imprecise internal cooling, influenced by workpiece shape or cutting processes, results in inconsistent cooling medium levels, causing fluctuating tool tip temperatures. This leads to unstable tool life, making fixed-frequency tool changes impossible, and hindering automation and unattended operation.

[0006] To ensure more stable operation of automated equipment, most cutting tools use internal cooling. However, existing cutting tools with internal cooling have many drawbacks and are subject to numerous limitations in use.

[0007] For example, the invention patent with announcement number CN107708899B uses a lever clamping method to attach the coolant nozzle. Its disadvantages are: ① The lever clamping mechanism itself is relatively complex and difficult to manufacture; ② After attachment, the cutting tool is not secure; ③ The nozzle rotates around the screw, requiring manual alignment during cutting tool installation, making precise nozzle installation difficult and potentially leading to coolant leakage or inaccurate coolant spraying onto the cutting area; ④ This structure requires a large installation space and cannot be applied to small-diameter cutting tools; ⑤ This structure requires removing a significant amount of material from inside the tool holder, potentially reducing the structural strength of the tool holder.

[0008] For example, the invention patent with announcement number CN107708900B describes a nozzle that uses a fixed pipe inserted into a hole on the tool holder to guide coolant into the nozzle. The disadvantages of this structure are: ① The overall length dimension of the nozzle is large, making it unsuitable for small-diameter tools; ② A large amount of material needs to be removed from inside the tool holder, which can easily reduce the structural strength of the tool holder; ③ When loading and unloading the cutting tool, the movement direction of the nozzle is not entirely along the axial direction of the pipe, and there is also a tilting force, which can cause friction between the pipe and the sealing ring and the guide hole on the tool holder, making the sealing ring prone to damage; ④ The relative positions of each part of the tool holder are highly precise during manufacturing, and it must be manufactured using a five-axis machine tool, which limits the production capacity of mass production.

[0009] For example, the utility model patent with announcement number CN209716491U has a nozzle with a T-shaped structure. The nozzle has a pipe perpendicular to the cutting plane that can be inserted into a hole on the tool holder to guide the coolant into the nozzle. The pipe is inserted into the tool holder, which restricts the position of the nozzle. The disadvantages of this structure are: ① The accuracy of the blade installation depends on whether the operator pushes the blade into place on the tool holder when installing the blade, and the installation accuracy is highly uncertain; ② The blade may be displaced during the cutting process, causing the blade to fly out or the workpiece to be scrapped. Summary of the Invention

[0010] The present invention provides a cutting tool with an internal cooling structure, which can solve one or more of the problems of the prior art mentioned above.

[0011] According to one aspect of the present invention, a cutting tool with an internal cooling structure is provided, comprising a tool holder, a nozzle, and a cutting insert; the cutting insert is disposed at one end of the tool holder; a first cooling channel is provided inside the tool holder; a second cooling channel is disposed inside the nozzle, the second cooling channel being connected to the first cooling channel, and the connection between the first cooling channel and the second cooling channel being a planar seal; the second cooling channel includes at least one fluid discharge hole, the at least one fluid discharge hole being disposed opposite to the cutting insert;

[0012] The nozzle has a front end, a rear end, and a bottom surface. The bottom surface is equipped with a tensioning component that can mate with the blade hole on the blade and can contact the blade surface. A bolt through hole perpendicular to the bottom surface is provided between the front end and the rear end. The tail end of the nozzle bolt can pass through the bolt through hole and be fixed to the blade shank.

[0013] The beneficial effects of this invention are as follows: the nozzle contacts the cutting edge surface, enabling downward pressure on the cutting edge; the tensioning component on the bottom of the nozzle cooperates with the cutting edge hole, enabling backward pulling of the cutting edge. This clamping method, which simultaneously applies upward pressure and internal hole backward pulling for dual locking, improves the installation accuracy of the cutting edge, ensures stable clamping force, maintains long-term accuracy during cutting, can withstand large cutting depths, and improves machining efficiency. The nozzle can both clamp the cutting edge and deliver the cooling medium without increasing space occupation and requires fewer auxiliary parts. The overall structure is simple, and the nozzle dimensions in all directions (length, width, and height) can be made smaller, saving a lot of space and allowing it to be used on smaller diameter tool holders, thus having a wide range of applications. The nozzle structure of this invention is compact and small in size, requiring less material removal in the mounting area on the tool holder, resulting in high tool holder strength.

[0014] In some embodiments, the tensioning assembly is disposed at the front end of the nozzle and includes a clamping boss protruding downward from the bottom surface of the nozzle. A cylindrical boss and a pull-back boss are disposed on the side of the clamping boss away from the bottom surface. The cylindrical boss and the pull-back boss can be embedded in the blade hole, and the lower surface of the clamping boss can contact the top surface of the blade.

[0015] Its advantages lie in the simple structure and ease of machining of the tensioning assembly. The clamping boss presses the cutting tool downwards, while the pull-back boss embeds itself into the cutting tool hole to pull the cutting tool backwards, thus achieving double locking, ensuring the accuracy of the cutting tool installation, and preventing the cutting tool from shifting during the cutting process.

[0016] In some embodiments, a first cooling channel extends from the end of the tool holder away from the cutting tool to the cooling hole, and a second cooling channel is provided with a fluid inlet hole that communicates with the cooling hole;

[0017] The nozzle is provided with a sealing surface, and the fluid inlet hole is located on the sealing surface; a sealing ring is provided at the connection between the fluid inlet hole and the cooling hole; a sealing countersunk hole is provided at the cooling hole;

[0018] The gap between the sealing surface and the tool holder is 0.1mm-1.5mm, and the compression of the sealing ring is 0.1mm-0.5mm.

[0019] Its beneficial effects are that the plane seal at the connection between the first and second cooling channels ensures good flow of the cooling medium. The sealing surface does not contact the tool holder, ensuring that the nozzle is locked by pressing down and pulling back the blade. Controlling the compression of the sealing ring ensures that, under normal conditions, a portion of the sealing ring protrudes from the sealing countersunk hole of the tool holder. Even when the sealing ring is compressed by the nozzle, a portion of it remains exposed in the sealing countersunk hole. Therefore, the sealing ring ensures a seal between the nozzle and the tool holder, preventing leakage of the cooling medium.

[0020] In some implementations, the sealing ring is an O-ring, which is placed inside the sealing countersunk hole of the tool holder and is not easily dislodged.

[0021] In some embodiments, the sealing ring is a rectangular ring. The height of the rectangular ring recessed into the sealing countersunk hole is greater than the height of the sealing countersunk hole protruding from the tool holder. The length of the rectangular ring recessed into the sealing countersunk hole is approximately 0.3 to 2 times the diameter of the sealing countersunk hole. This provides better anti-loosening performance compared to O-rings, and is easier and cheaper to manufacture. The rectangular ring can be used for medium and low pressure cooling below 7 MPa. With the selection of appropriate sealing ring materials and an appropriate distance between the sealing surface and the tool holder, it can be used for high pressure cooling of 7-15 MPa.

[0022] In some embodiments, the sealing ring can be tenoned to the sealing countersunk hole. The sealing ring is a ring with a characteristic structure that hooks into the sealing countersunk hole with a characteristic structure on the tool holder, and the two are tenoned together, making the sealing ring less likely to fall off.

[0023] In some embodiments, the sealing ring has a drum-shaped groove inside. According to Bernoulli's principle, when the cooling medium passes through the drum-shaped groove of the sealing ring, due to the large cross-sectional area of ​​the pipe, the low flow velocity, and the high pressure, the pressure inside the drum-shaped groove allows the sealing ring to fit better against the nozzle sealing surface, making the seal more reliable. This type of sealing ring has good anti-loosening effect and can withstand greater fluid pressure. After selecting appropriate sealing ring materials and an appropriate distance between the sealing surface and the tool holder, it can be used for high-pressure cooling of 15-30 MPa. This cooling pressure is very suitable for high-speed machining of heat-resistant alloys.

[0024] In some embodiments, the sealing surface is coplanar with or parallel to the bottom surface of the nozzle. When the sealing surface is coplanar with the bottom surface of the nozzle, the fluid inlet is located on the bottom surface of the nozzle, resulting in a simple nozzle structure, reduced size, space saving, and a wide range of applications. When the sealing surface is parallel to the bottom surface of the nozzle, the fluid inlet is not located on the bottom surface of the nozzle, and there is a certain height difference between the bottom surface of the nozzle and the sealing surface, which facilitates the machining of the bottom surface of the nozzle.

[0025] In some implementations, a positioning assembly is provided between the nozzle and the tool holder. This allows for accurate nozzle mounting, ensuring that the cooling medium is precisely sprayed onto the designated cutting area.

[0026] In some embodiments, the positioning assembly includes a positioning hole, a positioning groove, and a pin; the positioning hole is disposed on the tool holder, the positioning groove is disposed on the bottom surface of the nozzle, and the two ends of the pin can be inserted into the positioning hole and the positioning groove, respectively.

[0027] The positioning groove can be in the form of a recess. The positioning groove can be an open U-shaped groove set on the side of the nozzle away from the blade, or it can be a closed groove set between the sliding inclined surfaces. The pin can be inserted into the groove to play a positioning and anti-rotation role.

[0028] In some embodiments, the positioning component includes a positioning hole disposed on the tool holder and a positioning post disposed on the bottom surface of the nozzle, the end of the positioning post being able to be inserted into the positioning hole.

[0029] The positioning pin on the bottom of the nozzle is inserted into the positioning hole on the tool holder to perform the positioning function. The positioning pin replaces the pin, and no separate pin is required in this implementation.

[0030] In some embodiments, the line connecting the center of the rear pull boss and the center of the nozzle rear end is the nozzle pull axis; the angle between the direction of the cooling medium exiting from the fluid discharge hole and the nozzle pull axis is less than 90°. The cooling medium flows into the second cooling channel through the first cooling channel and is then ejected through the fluid discharge hole. The direction of the fluid discharge hole is not necessarily parallel to the nozzle pull axis, but it is always precisely aligned with the cutting tip in the cutting area. The angle between the direction of the fluid discharge hole and the nozzle pull axis is always ensured to be an acute angle, resulting in a smooth nozzle structure.

[0031] In some implementations, the pull-back boss, fluid inlet, and bolt through-hole are not aligned. The bolt through-hole is not located between the fluid inlet and outlet, resulting in a shorter second cooling channel. A single nozzle bolt can be used to lock the blade and nozzle onto the tool holder, resulting in a smaller nozzle dimension along its length, which is advantageous for applications on smaller tool holders.

[0032] In some implementations, the second cooling channel is a conformal aperture generated by one or more curve scans, produced by additive manufacturing technology. Its advantages include a short production cycle, allowing for more flexible designs, and the nozzle size can be made smaller, making it more suitable for use on smaller tool holders.

[0033] In some implementations, the second cooling channel may be composed of several intersecting straight holes, produced by subtractive manufacturing technology, which has the advantage of low unit cost in mass production. Attached Figure Description

[0034] Figure 1 This is an exploded view of the cutting tool with an internal cooling structure according to Embodiment 1 of the present invention;

[0035] Figure 2 for Figure 1 Assembly drawing of a cutting tool with an internal cooling structure;

[0036] Figure 3 for Figure 1 A three-dimensional schematic diagram of the nozzle of a cutting tool with an internal cooling structure;

[0037] Figure 4 for Figure 3 A three-dimensional schematic diagram of the nozzle from another perspective;

[0038] Figure 5 for Figure 3 The nozzle shown is viewed from below.

[0039] Figure 6 for Figure 3 Side view of the nozzle shown;

[0040] Figure 7 for Figure 3 A schematic diagram showing the flow direction of the cooling medium inside the nozzle;

[0041] Figure 8 This is an exploded view of the cutting tool with an internal cooling structure according to Embodiment 2 of the present invention;

[0042] Figure 9 for Figure 8 A front view of the tool holder of a cutting tool with an internal cooling structure;

[0043] Figure 10 for Figure 8 A three-dimensional schematic diagram of the nozzle of a cutting tool with an internal cooling structure;

[0044] Figure 11 for Figure 8 A three-dimensional schematic diagram of the nozzle from another perspective;

[0045] Figure 12 for Figure 8 The nozzle shown is viewed from below.

[0046] Figure 13 for Figure 8 Side view of the nozzle shown;

[0047] Figure 14 for Figure 8 A schematic diagram showing the flow direction of the cooling medium inside the nozzle;

[0048] Figure 15 This is a side view of the nozzle of the cutting tool with an internal cooling structure according to Embodiment 3 of the present invention;

[0049] Figure 16 This is a schematic diagram of the fit between the sealing ring and the sealing counterbore of the cutting tool with an internal cooling structure according to Embodiment 3 of the present invention;

[0050] Figure 17 This is a side view of the nozzle of the cutting tool with an internal cooling structure according to Embodiment 4 of the present invention;

[0051] Figure 18 This is a schematic diagram showing the fit between the sealing ring and the sealing counterbore of the cutting tool with an internal cooling structure according to Embodiment 4 of the present invention;

[0052] Figure 19 This is a three-dimensional schematic diagram of the nozzle of the cutting tool with an internal cooling structure according to Embodiment 5 of the present invention;

[0053] Figure 20 for Figure 19A partial cross-sectional view of the nozzle shown.

[0054] Figure 21 for Figure 19 The diagram shows the connection between the nozzle and the cutter bar. Detailed Implementation

[0055] The present invention will now be described in further detail with reference to the accompanying drawings.

[0056] Example 1

[0057] Figures 1 to 7 A cutting tool with an internal cooling structure according to an embodiment of the present invention is schematically shown. As shown, the device includes a tool holder 201, a nozzle, and a cutting blade 261; one end of the tool holder 201 is provided with a cutting blade groove 207, and the cutting blade 261 is disposed in the cutting blade groove 207; a first cooling channel is provided inside the tool holder 201, extending from the end of the tool holder 201 away from the cutting blade 261 to a cooling hole 209; a second cooling channel 8 is disposed inside the nozzle, the second cooling channel 8 including a fluid inlet hole 1 and a fluid outlet hole 6. The fluid inlet hole 1 communicates with the cooling hole 209 of the first cooling channel, and the fluid outlet hole 6 is disposed opposite to the cutting blade 261. The connection between the first cooling channel and the second cooling channel 8 is a planar seal; in other embodiments, the fluid outlet holes 6 may be configured as two or more side by side as needed. The second cooling channel 8 is a conformal hole generated by one or more curve scans, and the nozzle is an integral structure produced by additive manufacturing technology.

[0058] The tool holder 201 has a blade groove 207, a spring hole 203, a screw hole 204, a sealing countersunk hole 208, a cooling hole 209, a positioning hole 211, and a pull-back bevel 212. Among them, the spring hole 203 and the screw hole 204 are coaxial, and the cooling hole 209 is inside the sealing countersunk hole 208.

[0059] The bottom surface of the blade 261 coincides with the bottom surface of the blade groove 207, and the side surface 262 of the blade coincides with the abutment surface 205 of the blade groove 207. The blade shank 201 has a blade tip clearance groove 210 that avoids interference with the blade tip 260 of the blade 261. The spring 267 is installed in the spring hole 203 of the blade shank 201, the sealing ring 268 is installed in the sealing countersunk hole 208, the nozzle bolt 270 passes through the bolt through hole 12 of the nozzle, the nozzle bolt cap 271 rests on the bolt countersunk hole 13 on the top surface of the nozzle, and the nozzle bolt 270 is screwed into the screw hole 204.

[0060] The nozzle has a front end, a rear end, and a bottom surface 19. The bottom surface 19 is equipped with a tensioning assembly that can engage with the blade hole 264 on the blade 261 and can contact the surface of the blade 261. A bolt through hole 12 perpendicular to the bottom surface 19 is provided between the front end and the rear end. The bolt through hole 12 extends from the bottom surface 19 of the nozzle to the top surface opposite to the bottom surface 19. The tail end of the nozzle bolt 270 can pass through the bolt through hole 12 and be fixed to the blade shank 201.

[0061] The tensioning assembly is disposed at the front end of the nozzle and includes a clamping boss 14 protruding downward from the bottom surface 19 of the nozzle. A cylindrical boss 15 is disposed on the side of the clamping boss 14 away from the bottom surface 19, and a flange is provided on the side of the cylindrical boss 15 away from the nozzle front end, which is a pull-back boss 16. The cylindrical boss 15 and the pull-back boss 16 can be inserted into the blade hole 264, and the lower surface of the clamping boss 14 can contact the top surface 263 of the blade.

[0062] The bottom surface 19 at the rear end of the nozzle is also provided with a sliding inclined surface 20, and there is a certain angle between the sliding inclined surface 20 and the bottom surface 19. Correspondingly, the tool holder 201 is provided with a pull-back inclined surface 212. When the nozzle and the tool holder 201 are assembled, the sliding inclined surface 20 and the pull-back inclined surface 212 are in contact.

[0063] The lower surface of the clamping boss 14 can press against the top surface 263 of the blade, pressing down on the blade 261. The pull-back boss 16 is inserted into the blade hole 264 to hook the blade 261. The sliding ramp 20 can press against the pull-back ramp 212 of the blade shank 201 and slide backward. The nozzle pulls the blade 261 backward through the pull-back boss 16. In this way, a double locking effect on the blade 261 is achieved.

[0064] The nozzle has a sealing surface 4, which is coplanar with the bottom surface 19 of the nozzle in this embodiment. A fluid discharge hole 6 is located at the front end of the nozzle, and a fluid inlet hole 1 is disposed on the sealing surface 4. A sealing ring 268 is disposed at the connection between the fluid inlet hole 1 and the cooling hole 209. The sealing ring 268 can be embedded in the sealing countersunk hole 208. In this embodiment, the sealing ring 268 is an O-ring.

[0065] When installing the nozzle, as the nozzle bolt 270 is screwed into the screw hole 204, the cylindrical boss 15 on the nozzle is guided into the blade hole 264 through the chamfer 265. The top surface 263 of the blade contacts the lower surface of the clamping boss 14. The sliding inclined surface 20 contacts the pull-back inclined surface 212 on the blade bar 201. The sliding inclined surface 20 slides down along the pull-back inclined surface 212 until the pull-back boss 16 contacts the blade hole 264. The spring 267 is compressed between the spring hole 203 and the nozzle spring hole 2, and the sealing ring 268 is compressed between the sealing countersunk hole 208 and the sealing surface 4.

[0066] At this time, the nozzle bolt 270 has locked both the nozzle and the blade 261 onto the tool holder 201. The cooling medium enters the cooling hole 209 through the first cooling channel inside the tool holder 201, and then enters the second cooling channel 8 through the sealing countersunk hole 208, the sealing ring 268, and the fluid inlet hole 1. Finally, it is sprayed onto the tool tip from the fluid outlet hole 6 for cooling the cutting area of ​​the tool tip.

[0067] The line connecting the center of the rear pull boss 16 and the center of the nozzle rear end is the nozzle pull axis 7; the fluid inlet hole 1 and the bolt through hole 12 are respectively on both sides of the nozzle pull axis 7.

[0068] The nozzle only slides on the inclined surface 20, which contacts the cutter bar 201. The nozzle bottom surface 19 and the sealing surface 4 do not contact the cutter bar 201. The gap between the sealing surface 4 and the cutter bar 201 is 0.1 mm. This ensures that the nozzle locks the blade 261 by pressing it down and pulling it back. Under normal conditions, a portion of the sealing ring 268 protrudes from the sealing countersunk hole 208 of the cutter bar 201. When the sealing ring 268 is compressed by the nozzle, the compression amount is 0.1 mm. At this time, a portion of the sealing ring 268 still protrudes from the sealing countersunk hole 208 of the cutter bar 201. Therefore, the sealing ring 268 can ensure a seal between the nozzle and the cutter bar 201 without leakage of the cooling medium.

[0069] To improve sealing performance, modern precision manufacturing technology is used to easily control the distance between the nozzle bottom surface 19 or sealing surface 4 and the knife rod 201, and to control the distance between the blade 261 and the pull-back inclined surface 212. Therefore, the positional accuracy between the fluid inlet hole 1 and the sealing ring 268 can be guaranteed, misalignment can be prevented, and the compression of the sealing ring 268 can be prevented from being too little or too much, thus ensuring effective sealing.

[0070] To improve sealing performance, the sealing ring 268 is produced using modern precision manufacturing technology, which can effectively control the thickness tolerance of the sealing ring 268, prevent the compression of the sealing ring 268 from being too small or too large, and ensure effective sealing.

[0071] A positioning assembly is provided between the nozzle and the tool holder 201. The positioning assembly includes a positioning hole 211, a positioning groove 3, and a pin 257. The positioning hole 211 is located near the pull-back inclined surface 212 on the tool holder 201. The positioning groove 3 is a recessed structure located on the sliding inclined surface 20 on the bottom surface 19 of the nozzle, situated on the nozzle pull axis 7, dividing the sliding inclined surface 20 into two parts. Both ends of the pin 257 can be inserted into the positioning hole 211 and the positioning groove 3, respectively. A spring 267 can also be sleeved on the outside of the pin 257.

[0072] One end of the pin 257 is installed in the positioning hole 211 of the tool holder 201, and the other end is installed in the positioning groove 3 of the nozzle. After loosening the nozzle bolt 270 for installing the nozzle, the spring 267 can lift the nozzle upward, which facilitates the installation and removal of the blade 261. During the tightening of the nozzle bolt 270, the pin 257 is inserted into the positioning groove 3 of the nozzle to prevent the nozzle from rotating and to ensure that the nozzle is accurately installed in place.

[0073] Example 2

[0074] Figures 8 to 14 The cutting tool with an internal cooling structure of this embodiment is schematically shown. The difference from Embodiment 1 is that...

[0075] The centers of the fluid inlet hole 1 and the bolt through hole 12 are both on the nozzle tension axis 7; the bolt through hole 12 is located between the fluid inlet hole 1 and the pull-back boss 16, and the fluid inlet hole 1 is located in the middle of the sliding inclined surface 20 and divides the sliding inclined surface 20 into two.

[0076] The positioning groove 3 is an open U-shaped groove structure, located at the furthest point from the nozzle pull axis 7 away from the fluid discharge hole 6.

[0077] The second cooling channel 8 passes through both sides of the bolt through hole 12, and the two ends of the second cooling channel 8 are respectively connected to the fluid inlet hole 1 and the fluid outlet hole 6.

[0078] The sealing countersunk hole 208 on the tool holder 201 is located between the pull-back inclined surfaces 212.

[0079] The gap between the sealing surface 4 and the tool holder 201 is 0.5mm, and the compression of the sealing ring 268 is 0.3mm. For example... Figure 11 and Figure 12 As shown, the sealing surface 4 is parallel to but not coplanar with the bottom surface 19 of the nozzle, and there is a certain height difference between the two.

[0080] Example 3

[0081] Figures 15-16 The cutting tool with an internal cooling structure of this embodiment is schematically shown. The difference from Embodiment 1 is that...

[0082] The gap between the sealing surface 4 and the knife shank 201 is 1.5mm, and the compression of the sealing ring 268 is 0.5mm.

[0083] The positioning assembly includes a positioning hole 211 disposed on the tool holder 201 and a positioning post 3' disposed on the bottom surface 19 of the nozzle. The end of the positioning post 3' can be inserted into the positioning hole 211. The positioning post 3' is located on the side of the sliding inclined surface 20 away from the fluid discharge hole 6. The positioning post 3' replaces the function of the pin 257. In this embodiment, there is no separate pin 257. The positioning post 3' is directly inserted into the positioning hole 211 on the tool holder 201 to perform the positioning function.

[0084] Another difference in this embodiment is that the sealing ring 268 has a rectangular cross-section. The depth to which the sealing ring 268 is recessed into the sealing countersunk hole 208 is L214, the distance from which the sealing ring 268 protrudes from the tool holder 201 is L215, and the diameter of the sealing countersunk hole 208 is D213. The relationship between these three is as follows: the installation depth of the sealing ring 268, L214, is approximately 0.3 times the diameter of the sealing countersunk hole 208, D213; and the installation depth of the sealing ring 268, L214, is twice the exposed length of the sealing ring 268, L215. This makes the sealing ring 268 less prone to falling off.

[0085] Example 4

[0086] Figures 17-18 The cutting tool with an internal cooling structure of this embodiment is schematically shown. The difference from Embodiment 1 is that...

[0087] The gap between the sealing surface 4 and the knife shank 201 is 0.3mm, and the compression of the sealing ring 268 is 0.5mm.

[0088] The positioning assembly includes a positioning hole 211 disposed on the tool holder 201 and a positioning post 3' disposed on the bottom surface 19 of the nozzle. The end of the positioning post 3' can be inserted into the positioning hole 211. The positioning post 3' is located on the side of the sliding inclined surface 20 away from the fluid discharge hole 6. The positioning post 3' replaces the function of the pin 257. In this embodiment, there is no separate pin 257. The positioning post 3' is directly inserted into the positioning hole 211 on the tool holder 201 to perform the positioning function.

[0089] The structure of the sealing ring 268 is improved based on embodiment 3. The cross-section of the sealing ring 268 is an irregular structure, which includes a tapered protrusion 221 on the outer diameter of the sealing ring 268, a drum-shaped groove 222 inside the sealing ring 268, and a buckle 216 inside the sealing countersunk hole 208. The tapered protrusion 221 on the sealing ring 268 can be tenoned with the buckle 216 of the sealing countersunk hole 208, making the sealing ring 268 less likely to fall off.

[0090] The installation depth of sealing ring 268, L214, is approximately twice the diameter of the counterbore 208, D213. The installation depth of sealing ring 268, L214, is seven times the exposed length of sealing ring 268, L215.

[0091] The diameter of the internal drum-shaped groove 222 is larger than the diameter of the holes on both sides of the sealing ring 268. When fluid passes through the sealing ring 268, according to Bernoulli's principle, a greater fluid pressure can be generated at the drum-shaped groove 222. The fluid pressure follows the formula... Figure 18 The arrows in the diagram correspond to both the cutter bar 201 and the nozzle, making the seal more reliable and enabling it to withstand greater fluid pressure compared to Embodiments 1 and 3.

[0092] Example 5

[0093] Figures 19-21 The cutting tool with an internal cooling structure of this embodiment is schematically shown. The difference from Embodiment 1 is that...

[0094] The gap between the sealing surface 4 and the knife shank 201 is 0.1mm, and the compression of the sealing ring 268 is 0.5mm.

[0095] The sealing surface 4 does not coincide with the nozzle bottom surface 19. An annular boss surrounds the fluid inlet hole 1, and the sealing surface 4 is the lower surface of this annular boss, parallel to the nozzle bottom surface 19, with a certain height difference between them. The diameter D11 of the annular boss is smaller than the sealing countersunk hole 208, forming a gap. The annular boss can extend 0-1 mm into the sealing countersunk hole 208, thus preventing the sealing ring 268 from protruding from the sealing countersunk hole 208. This prevents the sealing ring 268 from falling off.

[0096] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A cutting tool with an internal cooling structure, characterized in that, Includes a tool holder (201), a nozzle, and a blade (261); The blade (261) is disposed at one end of the tool holder (201); The tool holder (201) has a first cooling channel inside; The nozzle is provided with a second cooling channel (8) inside, which is connected to the first cooling channel. The connection between the first cooling channel and the second cooling channel (8) is a planar seal. The second cooling channel (8) includes at least one fluid discharge port (6), which is disposed opposite to the blade (261); The nozzle has a front end, a rear end, and a bottom surface (19). The bottom surface (19) is provided with a tensioning assembly that can engage with a blade hole (264) on the blade (261) and can contact the surface of the blade (261). A bolt through hole (12) perpendicular to the bottom surface (19) is provided between the front end and the rear end; The tail end of the nozzle bolt (270) can pass through the bolt through hole (12) and be fixed to the knife bar (201); The tensioning assembly is disposed at the front end of the nozzle and includes a pressing boss (14) protruding downward from the bottom surface (19) of the nozzle. A pull-back boss (16) is disposed on the side of the pressing boss (14) away from the bottom surface (19). The pull-back boss (16) can be embedded in the blade hole (264). The lower surface of the pressing boss (14) can contact the top surface (263) of the blade. A positioning assembly is disposed between the nozzle and the cutter bar (201); The line connecting the center of the rear pull boss (16) and the center of the rear end of the nozzle is the nozzle pull axis (7); the angle between the direction of the cooling medium discharged from the fluid discharge hole (6) and the nozzle pull axis (7) is less than 90°; The rear pull-out boss (16), the fluid inlet hole (1), and the bolt through hole (12) are not on the same straight line; The positioning component includes a positioning hole (211) and a positioning groove (3). The positioning hole (211) is disposed on the tool bar (201), and the positioning groove (3) is disposed on the bottom surface (19) of the nozzle. The rear pull-out boss (16), the positioning groove (3), and the bolt through hole (12) are not on the same straight line; The centers of the bolt through hole (12) and the fluid inlet hole (1) are located on both sides of the nozzle tension axis (7); The second cooling channel (8) is a conformal hole generated by one or more curve scans and produced by additive manufacturing technology.

2. The cutting tool with an internal cooling structure according to claim 1, characterized in that, The first cooling channel extends from one end of the tool holder (201) away from the blade (261) to the cooling hole (209), and the second cooling channel (8) is provided with a fluid inlet hole (1), which is connected to the cooling hole (209); The nozzle is provided with a sealing surface (4), and the fluid inlet hole (1) is disposed on the sealing surface (4); a sealing ring (268) is disposed at the connection between the fluid inlet hole (1) and the cooling hole (209); a sealing countersunk hole (208) is disposed at the cooling hole (209); The gap between the sealing surface (4) and the knife bar (201) is 0.1mm-1.5mm, and the compression of the sealing ring (268) is 0.1mm-0.5mm.

3. The cutting tool with an internal cooling structure according to claim 2, characterized in that, The sealing ring (268) is an O-ring or a rectangular ring.

4. The cutting tool with an internal cooling structure according to claim 2, characterized in that, The sealing ring (268) has a drum-shaped groove (222) inside; the sealing ring (268) can be tenoned with the sealing countersunk hole (208).

5. The cutting tool with an internal cooling structure according to claim 2, characterized in that, The sealing surface (4) is coplanar or parallel to the bottom surface (19) of the nozzle.

6. The cutting tool with an internal cooling structure according to claim 1, characterized in that, The positioning component also includes a pin (257); both ends of the pin (257) can be inserted into the positioning hole (211) and the positioning groove (3), respectively.

7. The cutting tool with an internal cooling structure according to claim 1, characterized in that, The positioning component includes a positioning hole (211) disposed on the cutter bar (201) and a positioning post (3') disposed on the bottom surface (19) of the nozzle, the end of the positioning post (3') being able to be inserted into the positioning hole (211).

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