Modularized cutter

Abstract

The utility model discloses a modularized cutter which comprises a cutter bar, a head module detachably installed on the cutter bar and a cutter head detachably installed on the head module. The head module is provided with a kidney-shaped key, the kidney-shaped key is provided with a locking pin, and the locking pin is provided with a pin hole. A kidney-shaped groove and a locking pin positioning hole located in the kidney-shaped groove are formed in the top end of the cutter bar, and a head module mounting hole communicated with the locking pin positioning hole is formed in the end of the cutter bar. The kidney-shaped key is matched with the kidney-shaped groove, the kidney-shaped key is embedded in the kidney-shaped groove, the locking pin is matched with the locking pin positioning hole, the locking pin is embedded in the locking pin positioning hole, the head module mounting hole is matched with the pin hole, and a fastener penetrates through the head module mounting hole and the pin hole to fix the head module and the cutter bar. The radial locking mode is adopted between the head module and the cutter bar of the cutter, a counter bore does not need to be formed in the head module, the problem that scrap iron is prone to being clamped in a hole existing in the counter bore is solved, and the use reliability of the cutter is greatly improved.

Description

Technical Field

[0001] This utility model relates to a modular cutting tool, belonging to the field of machining cutting tool technology. Background Technology

[0002] Twist drills, commonly known as twist drills, are tools used in metal cutting processes. They are tools that drill round holes in workpieces by rotating relative to a fixed axis. They are named for their spiral-shaped chip flutes, resembling a twisted rope. Twist drills can be mounted on manual or electric handheld drilling machines, drilling machines, milling machines, lathes, and even machining centers. The drill bit materials are generally high-speed tool steel or cemented carbide. Therefore, traditional metal cutting drill bits are commonly referred to as high-speed steel twist drills or cemented carbide twist drills.

[0003] In metal cutting processes, high-speed steel twist drills have a shorter lifespan, lower efficiency, and lower precision compared to carbide twist drills. They have been largely replaced by carbide twist drills in demanding applications. Carbide, composed of precious metals like tungsten and cobalt, along with trace amounts of rare elements, is a non-renewable resource. Because solid carbide twist drills are expensive, consume large amounts of carbide material, and have limited application scenarios, their manufacturing and use are extremely costly, especially in large-diameter drilling. Therefore, carbide twist drills are not economically viable for large-diameter, deep-hole machining applications.

[0004] Existing technologies have designed drill bits with replaceable cutting heads, solving problems such as high cost and machining deep holes, and have significant advantages. However, these existing replaceable-head drill bits generally have many problems. For example, when drilling mild steel, titanium, and stainless steel, some split drill bits that rely on deformation clamping are prone to tipping during retraction, leading to damage to the drill rod and thus scrapping high-value parts. Due to the high temperature and high load generated during cutting, the drill rod of split drill bits that rely on deformation clamping reaches its fatigue life limit prematurely, for example, requiring replacement of the cutting head after 10-20 uses. This results in the cutting head not being clamped tightly, affecting drilling accuracy, cutting head life, and machining stability.

[0005] In machining large-diameter deep holes (diameter > 26 mm, depth > 5 times the cutter head diameter), the deeper the hole, the more difficult the cooling becomes, and the less efficient the chip removal. As a result, the machining accuracy of the hole is not high, making it difficult to meet technical requirements and causing low production efficiency. The larger the hole diameter, the more rigidity and strength are required for the connection between the cutter head and the cutter body. The larger the cutter head, the larger the cutter body will also be. The more specifications there are, the more cutter bodies are needed, and the purchase cost of the cutter bodies will also increase. However, within a certain range, using cutter bodies with cutter heads of different diameters can effectively control the purchase cost.

[0006] Chinese patent document CN114131086A discloses a modular tool holder with interchangeable head modules. The head module has a first countersunk hole, a waist-shaped key is engaged in a waist-shaped groove, and the head module and tool body are secured by bolts passing through the first countersunk hole and a fourth positioning hole. This allows multiple tool heads of different diameters to be used on the same tool body, effectively saving costs, and offering high drilling accuracy, long tool head life, high machining stability, and high production efficiency. However, in practical applications, the following problems have been found: the head module and tool body are axially locked, i.e., secured by bolts passing through the first countersunk hole and the fourth positioning hole. However, because the countersunk hole has holes, it is prone to trapping metal chips during use, greatly reducing reliability. Utility Model Content

[0007] To address the aforementioned issues, this invention provides a modular cutting tool. The head module and the tool holder of this modular cutting tool are radially locked together, eliminating the need for countersunk holes in the head module. This avoids the problem of metal chips getting stuck in the countersunk holes, greatly improving the reliability of the cutting tool.

[0008] This utility model provides a modular cutting tool, including a tool holder, a head module detachably mounted on the tool holder, and a cutting head detachably mounted on the head module. The head module is provided with a waist-shaped key, the waist-shaped key is provided with a locking pin, and the locking pin has a pin hole. The top end of the tool holder has a waist-shaped groove and a locking pin positioning hole located in the waist-shaped groove, and the end of the tool holder has a head module mounting hole communicating with the locking pin positioning hole. The waist-shaped key is adapted to the waist-shaped groove and is embedded in the waist-shaped groove. The locking pin is adapted to the locking pin positioning hole and is embedded in the locking pin positioning hole. The head module mounting hole is adapted to the pin hole. The head module and the tool holder are fixed by fasteners passing through the head module mounting hole and the pin hole.

[0009] In one embodiment of this utility model, the locking pin has a semi-circular structure.

[0010] In one embodiment of this utility model, the cutting head is provided with a first positioning hole, a second positioning hole, a first positioning inclined surface located below the first positioning hole, and a second positioning inclined surface located below the second positioning hole; a first flat surface is provided on one side of the cutting head, and a second flat surface is provided on the other side; a first arc-shaped groove is provided on one side of the first flat surface, and a second arc-shaped groove is provided on one side of the second flat surface; the first positioning hole passes through the first flat surface and the second arc-shaped groove, and the second positioning hole passes through the second flat surface and the first arc-shaped groove; the first positioning inclined surface and the second positioning inclined surface form a "V" shaped structure; a bottom surface is provided at the bottom of the cutting head, and the first positioning inclined surface and the second positioning inclined surface extend to the bottom surface.

[0011] In one embodiment of this utility model, the bottom surface is provided with a groove, and the top of the blade is provided with a blade tip.

[0012] In one embodiment of this utility model, the head module includes a first spiral groove and a mounting part. The mounting part is located on both sides of the top of the head module. A blade is mounted on the mounting part. The mounting part is provided with a blade mounting hole. The blade is provided with a blade hole. The blade mounting hole and the blade hole are adapted to each other. The blade is fixedly mounted on the mounting part by passing a bolt through the blade mounting hole and the blade hole.

[0013] In one embodiment of this utility model, the top of the head module is provided with a mounting groove, and both sides of the mounting groove are provided with fixing blocks. Each fixing block is provided with a blade mounting hole. The two blade mounting holes correspond to the first positioning hole and the second positioning hole, respectively. The blade is installed in the mounting groove by screws passing through the two blade mounting holes, the first positioning hole and the second positioning hole, and abutting against the fixing block. Both sides of the mounting groove are provided with inclined surfaces. The side of the fixing block near the mounting groove is provided with a positioning surface. The two positioning surfaces abut against the first flat surface and the second flat surface, respectively. The two inclined surfaces abut against the first positioning inclined surface and the second positioning inclined surface, respectively.

[0014] In one embodiment of this utility model, the tool holder includes a clamping part, which is a cylinder. A clamping plane is formed on the cylindrical surface of the clamping part. One end of the clamping part is provided with an abutment part, and the end of the abutment part away from the clamping part is provided with a connecting part. At least one second spiral groove is formed on the surface of the connecting part. The clamping part, the abutment part, and the connecting part have the same axis. A groove is also provided between the abutment part and the clamping part. The outer diameter of the groove is smaller than the outer diameter of the clamping part. The outer diameter of the abutment part is larger than the outer diameter of the clamping part, and the outer diameter of the abutment part is greater than or equal to the outer diameter of the connecting part.

[0015] In one embodiment of the present invention, one end of the second spiral groove extends to the end of the connecting part near the abutment part, where the spiral angle of the second spiral groove is 0° to 20°; the other end of the second spiral groove extends to the top of the connecting part and intersects with the first spiral groove on the head module, where the spiral angle of the second spiral groove is 20° to 60°.

[0016] In one embodiment of this utility model, an internal cooling hole is also provided in the waist-shaped groove, and a through hole is provided inside the tool holder, the through hole extending to the bottom end of the clamping part, and the through hole communicating with the internal cooling hole; the head module is provided with a plurality of cooling holes, and the internal cooling hole communicating with the plurality of cooling holes.

[0017] In one embodiment of this utility model, the cutter head and the head module are clearance-fitted, and the waist-shaped groove of the cutter shank and the waist-shaped key of the head module are clearance-fitted.

[0018] The beneficial effects of this utility model are as follows:

[0019] Compared to the axial locking method used in existing technologies for the head module and tool holder, the modular tool provided by this invention employs a radial locking method. Specifically, a waist-shaped key mates with a waist-shaped groove, the key is embedded within the groove, a locking pin mates with a locking pin positioning hole, and the head module mounting hole mates with the pin hole. A screw is then used to radially lock the head module and tool holder by passing through the mounting hole and pin hole. This radial method eliminates the need for a countersunk hole in the head module, avoiding the problem of metal chips getting stuck and significantly improving the reliability of the tool. Furthermore, this radial locking method improves the ease of assembly and disassembly between the head module and tool holder, and enhances the positioning accuracy of the head module when mounted on the tool holder. The locking pin features a semi-circular structure with increased thickness, improving its structural strength and preventing breakage, thus ensuring a secure and reliable lock between the head module and tool holder. Attached Figure Description

[0020] Figure 1 Exploded view of the cutter head and head module provided by this utility model.

[0021] Figure 2 The front view of the head module provided by this utility model.

[0022] Figure 3 A perspective view of the head module provided by this utility model.

[0023] Figure 4 A three-dimensional view of the head module provided by this utility model from another perspective.

[0024] Figure 5 A perspective view of the blade provided by this utility model.

[0025] Figure 6 This is a three-dimensional view of the blade provided by this utility model.

[0026] Figure 7 The front view of the blade provided by this utility model.

[0027] Figure 8 A top view of the blade provided by this utility model.

[0028] Figure 9 A perspective view of the tool holder provided by this utility model.

[0029] Figure 10 A top view of the tool holder provided by this utility model.

[0030] Figure 11 A perspective view of the modular cutting tool provided by this utility model.

[0031] Figure 12 An exploded view of the modular cutting tool provided by this utility model.

[0032] Figure 13 An exploded view of the modular cutting tool provided by this utility model.

[0033] In the diagram: 1. Cutting head; 11. First positioning hole; 12. Second positioning hole; 13. First positioning bevel; 14. Second positioning bevel; 15. Bottom surface; 16. Groove; 17. Cutting tip; 18. First flat surface; 181. First arc groove; 19. Second flat surface; 191. Second arc groove; 2. Head module; 21. Waist-shaped key; 22. Locking pin; 221. Pin hole; 23. Fixing block; 231. Cutting head mounting hole; 24. Cooling hole; 25. Mounting part; 251. Blade mounting hole; 252. Blade; 253. Blade hole; 26. First spiral groove; 27. Mounting groove; 271. Positioning surface; 28. Inclined surface; 3. Tool bar; 31. Clamping plane; 32. Through hole; 33. Slot; 34. Abutting part; 35. Connecting part; 36. Second spiral groove; 37. Waist-shaped groove; 371. Locking pin positioning hole; 372. Internal cooling hole; 38. Clamping part; 39. Head module mounting hole. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] Please see Figures 1 to 13 As shown, this utility model provides a modular cutting tool, including a tool holder 3, a head module 2 detachably mounted on the tool holder 3, and a cutting head 1 detachably mounted on the head module 2; the head module 2 is provided with a waist-shaped key 21, the waist-shaped key 21 is provided with a locking pin 22, and the locking pin 22 has a pin hole 221; the top end of the tool holder 3 has a waist-shaped groove 37 and a locking pin positioning hole 371 located in the waist-shaped groove 37, and the end of the tool holder 3... A head module mounting hole 39 is provided, communicating with the locking pin positioning hole 371; the waist-shaped key 21 is adapted to the waist-shaped groove 37 and is embedded in the waist-shaped groove 37; the locking pin 22 is adapted to the locking pin positioning hole 371 and is embedded in the locking pin positioning hole 371; the head module mounting hole 39 is adapted to the pin hole 221; the head module 2 and the tool holder 3 are fixed by fasteners passing through the head module mounting hole 39 and the pin hole 221. Optionally, the fasteners can be screws.

[0038] Furthermore, the locking pin 22 has a semi-circular structure. This design increases the thickness of the locking pin 22, improves its structural strength, and prevents breakage, thereby ensuring a secure and reliable lock between the head module 2 and the tool holder 3. The semi-circular structure refers to the locking pin 22 having a cross-section between a semicircle and a full circle.

[0039] Optionally, the bottom surface of the waist-shaped groove 37 is perpendicular to the axis of the tool holder 3. The length of the waist-shaped groove 37 is 0.5 to 0.9 times the diameter of the head of the tool holder 3, the width of the waist-shaped groove 37 is 0.15 to 0.35 times the diameter of the head of the tool holder 3, and the depth of the waist-shaped groove 37 is 0.05 to 0.3 times the diameter of the head of the tool holder 3. If the length and width of the waist-shaped groove 37 are too small, the driving effect will be poor and the positioning will be unstable; if they are too large, the wall thickness will be too thin and easily damaged; if the depth of the waist-shaped groove 37 is too shallow, there will be no positioning effect; if it is too deep, it will increase the processing difficulty and cause waste.

[0040] In some embodiments, the cutter head 1 is provided with a first positioning hole 11, a second positioning hole 12, a first positioning inclined surface 13 located below the first positioning hole 11, and a second positioning inclined surface 14 located below the second positioning hole 12; a first flat surface 18 is provided on one side of the cutter head 1, and a second flat surface 19 is provided on the other side; a first arc-shaped groove 181 is provided on one side of the first flat surface 18, and a second arc-shaped groove 191 is provided on one side of the second flat surface 19; the first positioning hole 11 passes through the first flat surface 18 and the second arc-shaped groove 191, and the second positioning hole 12 passes through the second flat surface 19 and the first arc-shaped groove 181; the first positioning inclined surface 13 and the second positioning inclined surface 14 form a "V" shaped structure; a bottom surface 15 is provided at the bottom of the cutter head 1, and the first positioning inclined surface 13 and the second positioning inclined surface 14 extend to the bottom surface 15.

[0041] Furthermore, the bottom surface 15 is provided with a groove 16, and the top of the blade head 1 is provided with a blade tip 17.

[0042] Optionally, the first positioning hole 11 and the second positioning hole 12, the first flat surface 18 and the second flat surface 19, and the first arc groove 181 and the second arc groove 191 are all arranged in a centrally symmetrical manner about the central axis between the blade tip 17 and the bottom surface 15.

[0043] Optionally, both the first positioning hole 11 and the second positioning hole 12 are countersunk holes. The center distance between the first positioning hole 11 and the second positioning hole 12 is defined as A, the diameter of the cutting head 1 is D, the height of the cutting head 1 is H, the thickness of the cutting head 1 is W, the distance from the center of the positioning hole to the nearest drill tip is X, and the distance from the center of the positioning hole to the nearest positioning inclined surface is Y, satisfying the following relationships: 40%D≤A≤60%D; 60%D≤H≤80%D; 30%D≤W≤50%D; 1.0Y≤X≤1.5Y; the size of the countersunk hole is φ2.0~φ7.0; the size of the countersunk is φ2.5~φ8.0; and the countersunk depth Z satisfies: 10%W≤Z≤40%W.

[0044] In some embodiments, the head module 2 includes a first spiral groove 26 and a mounting portion 25. The mounting portion 25 is located on both sides of the top of the head module 2. A blade 252 is mounted on the mounting portion 25. The mounting portion 25 is provided with a blade mounting hole 251. The blade 252 is provided with a blade hole 253. The blade mounting hole 251 and the blade hole 253 are adapted to each other. The blade 252 is fixedly mounted on the mounting portion 25 by bolts passing through the blade mounting hole 251 and the blade hole 253.

[0045] Optionally, the blade 252 is an ISO standard blade.

[0046] Furthermore, the top of the head module 2 is provided with a mounting groove 27, and fixing blocks 23 are provided on both sides of the mounting groove 27. Each fixing block 23 is provided with a blade mounting hole 231. The two blade mounting holes 231 correspond to the first positioning hole 11 and the second positioning hole 12, respectively. The blade 1 is installed in the mounting groove 27 by screws passing through the two blade mounting holes 231, the first positioning hole 11 and the second positioning hole 12, and abuts against the fixing block 23. Both sides of the mounting groove 27 are provided with inclined surfaces 28. The fixing block 23 is provided with a positioning surface 271 on the side near the mounting groove 27. The two positioning surfaces 271 abut against the first flat surface 18 and the second flat surface 19, respectively. The two inclined surfaces 28 abut against the first positioning inclined surface 13 and the second positioning inclined surface 14, respectively.

[0047] Furthermore, there are two fixing blocks 23 and two positioning surfaces 271. The two positioning surfaces 271 are parallel to each other, and the distance between the two positioning surfaces 271 is equal to the width of the mounting groove 27. The groove width is 5 to 18 mm, and the cutter head 1 can abut against the positioning surface 271 to offset the cutting force.

[0048] Furthermore, the diameter of the head module 2 ranges from 30 mm to 100 mm. For head modules 2 with a diameter of less than 30 mm, due to the small space of the cutting head, only relatively small cutting blades can be used on both sides. However, small cutting blades have poor strength and are prone to breakage, making them practically useless. For cutting heads with a diameter of more than 100 mm, even single cutting blades on both sides are insufficient to meet the drilling requirements.

[0049] Furthermore, the height of the head module 2 is 0.5 to 1.5 times the diameter of the head module 2.

[0050] Furthermore, the cutter head 1 and the head module 2 are in clearance fit, with a clearance range of 0.001 to 0.02 mm on one side.

[0051] During installation, the first positioning bevel 13 and the second positioning bevel 14 on both sides of the cutter head 1 move downwards along the two bevels 28 of the head module 2, placing the cutter head 1 into the mounting groove 27, where it is positioned by the two positioning surfaces 271 and the two bevels 28. Two screws are passed through the two cutter head mounting holes 231 and locked into the first positioning hole 11 and the second positioning hole 12 respectively, thereby installing the cutter head 1 in the mounting groove 27 and abutting against the fixing block 23. Compared to the locking method with one screw, this invention uses two screws to lock the cutter head 1 and the head module 2, providing a very reliable lock. Furthermore, this radial locking method enables quick cutter head changes.

[0052] Therefore, the cutter head provided by this utility model has two positioning holes, and the head module has two cutter head mounting holes corresponding to the two positioning holes. Two screws are passed through the two cutting head mounting holes and locked in the two positioning holes, so that the cutter head is fixed to the head module by the two screws, preventing loosening and ensuring a firm lock. Moreover, each positioning hole can be matched and aligned with each cutting head mounting hole during each installation, resulting in high repeatability of the cutter head and convenient assembly and disassembly. In addition, when the cutter head is installed on the head module, the two "V"-shaped positioning bevels at the bottom of the cutter head abut against the two bevels of the head module, so that the cutter head can achieve V-shaped angle positioning, which is firm and reliable and will not cause the cutter head to shift. Furthermore, each positioning bevel of the cutter head can be matched with each bevel of the head module, making assembly quick and convenient and ensuring the assembly efficiency of the cutter head and head module.

[0053] In some embodiments, the tool holder 3 includes a clamping portion 38, which is a cylinder. A clamping plane 31 is formed on the cylindrical surface of the clamping portion 38. One end of the clamping portion 38 is provided with an abutment portion 34. The end of the abutment portion 34 away from the clamping portion 38 is provided with a connecting portion 35. At least one second spiral groove 36 is formed on the surface of the connecting portion 35. The clamping portion 38, the abutment portion 34 and the connecting portion 35 have the same axis. A groove 33 is also provided between the abutment portion 34 and the clamping portion 38. The outer diameter of the groove 33 is smaller than the outer diameter of the clamping portion 38. The outer diameter of the abutment portion 34 is larger than the outer diameter of the clamping portion 38. The outer diameter of the abutment portion 34 is greater than or equal to the outer diameter of the connecting portion 35.

[0054] In this embodiment, the clamping part 38 is fixed to a handheld drilling tool, drilling machine, milling machine, lathe or machining center through the clamping plane 31 and the slot 33. The abutment part 34 can make the clamping part 38 more secure and tight, enhance the impact resistance of the connecting part 35, and make the connecting part 35 less prone to deformation.

[0055] Furthermore, one end of the second spiral groove 36 extends to the end of the connecting portion 35 near the abutment portion 34, where the spiral angle of the second spiral groove 36 is 0° to 20°; the other end of the second spiral groove 36 extends to the top of the connecting portion 35 and intersects with the first spiral groove 26 on the head module 2, where the spiral angle of the second spiral groove 36 is 20° to 60°. This design prevents chips generated during cutting from getting stuck on the fixing block 23. The head of the fixing block 23 is tilted, which ensures the cutting angle and facilitates the transport of chips to the first spiral groove 26 and the second spiral groove 36. During the cutting process, the movement direction of the chips in the first spiral groove 26 and the second spiral groove 36 changes, making it easier for the chips to break and be discharged.

[0056] Furthermore, an internal cooling hole 372 is provided in the waist-shaped groove 37, and a through hole 32 is provided inside the tool holder 3. The through hole 32 extends to the bottom end of the clamping part 38 and is connected to the internal cooling hole 372. The head module 2 is provided with a number of cooling holes 24, and the internal cooling hole 372 is connected to the number of cooling holes 24.

[0057] In this embodiment, coolant flows through the through hole 32. The coolant enters from the through hole 32 and the internal cooling hole 372 into several cooling holes 24 of the head module 2, thereby achieving the effect of cooling the head module 2 and the cutter head 1. The cooling effect is good, the coolant flow is stable, and the debris is more easily discharged out of the hole along with the coolant.

[0058] Optionally, the diameter of the through hole 32 is 0.1 to 0.4 times the diameter of the head of the tool bar 3, and the head of the tool bar 3 is the end of the connecting part 35 near the head module 2.

[0059] Furthermore, the waist-shaped groove 37 of the tool holder 3 and the waist-shaped key 21 of the head module 2 are in clearance fit, with a clearance range of 0.001 to 0.02 mm on one side; the depth of the waist-shaped groove 37 is 0.5 to 1 mm deeper than the height of the waist-shaped key 21.

[0060] Furthermore, the head module 2 is an intermediate connecting part between the cutter head 1 and the tool holder 3, and the head module 2 is a modular design. The diameter of the head module 2 is 1 to 1.1 times the diameter of the head of the tool holder 3. Within this range, the size of the waist key 21 of the head module 2 is exactly the same. This allows multiple cutter heads 1 of different diameters to be used on the same tool holder 3, thereby effectively saving costs, and achieving high drilling accuracy, long cutter head service life, high processing stability, and high production efficiency. When installing the head module 2, the waist-shaped key 21 is placed into the waist-shaped groove 37, and the side of the keyway is used for positioning. The bottom surface of the head module 2 is in contact with the top surface of the tool holder 3. The locking pin 22 is adapted to the locking pin positioning hole 371 and is embedded in the locking pin positioning hole 371. The head module mounting hole 39 is adapted to the pin hole 221. The head module 2 and the tool holder 3 are fixed by screws passing through the head module mounting hole 39 and the pin hole 221, so that the connection between the head module 2 and the tool holder 3 has very good strength and rigidity. ISO standard inserts 252 are installed on the mounting parts 25 on both sides of the head module 2, and replaceable tool heads 1 are installed on the mounting groove 27 above the head module 2. The first spiral groove 26 and the second spiral groove 36 can effectively ensure chip removal, and the several cooling holes 24 on the head module 2 can provide good cooling, thereby achieving high precision and high efficiency machining of large-diameter deep holes.

[0061] In summary, compared to the axial locking method used in the prior art between the head module and the tool holder, the modular tool provided by this utility model uses a radial locking method between the head module and the tool holder. Specifically, the waist-shaped key 21 is adapted to the waist-shaped groove 37, and the waist-shaped key 21 is embedded within the waist-shaped groove 37. The locking pin 22 is adapted to the locking pin positioning hole 371, and the locking pin 22 is embedded within the locking pin positioning hole 371. The head module mounting hole 39 is adapted to the pin hole 221. The head module 2 and the tool holder 3 are fixed by a screw passing through the head module mounting hole 39 and the pin hole 221 in a radial locking manner. This radial method eliminates the need for a countersunk hole in the head module 2, thus avoiding the problem of metal chips getting stuck in the countersunk hole and greatly improving the reliability of the tool. Furthermore, this radial locking method improves the ease of disassembly and assembly between the head module 2 and the tool holder 3, and improves the positioning accuracy when the head module 2 is installed on the tool holder 3; the locking pin 22 is a semi-circular structure, the thickness of the locking pin 22 is increased, the structural strength of the locking pin 22 is improved, and its breakage is prevented, thereby ensuring the firmness and reliability of the locking between the head module 2 and the tool holder 3.

[0062] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modular cutting tool, characterized in that, The device includes a tool holder (3), a head module (2) detachably mounted on the tool holder (3), and a tool head (1) detachably mounted on the head module (2); the head module (2) is provided with a waist-shaped key (21), the waist-shaped key (21) is provided with a locking pin (22), and the locking pin (22) has a pin hole (221); the top end of the tool holder (3) is provided with a waist-shaped groove (37) and a locking pin positioning hole (371) located in the waist-shaped groove (37), and the end of the tool holder (3) is provided with a locking pin. The positioning hole (371) is connected to the head module mounting hole (39); the waist-shaped key (21) is adapted to the waist-shaped groove (37), the waist-shaped key (21) is embedded in the waist-shaped groove (37), the locking pin (22) is adapted to the locking pin positioning hole (371), the locking pin (22) is embedded in the locking pin positioning hole (371), the head module mounting hole (39) is adapted to the pin hole (221), and the head module (2) and the tool bar (3) are fixed by fasteners passing through the head module mounting hole (39) and the pin hole (221).

2. The modular cutting tool according to claim 1, characterized in that, The locking pin (22) has a semi-circular structure.

3. The modular cutting tool according to claim 1, characterized in that, The cutting head (1) is provided with a first positioning hole (11), a second positioning hole (12), a first positioning inclined surface (13) located below the first positioning hole (11), and a second positioning inclined surface (14) located below the second positioning hole (12); a first flat surface (18) is provided on one side of the cutting head (1), and a second flat surface (19) is provided on the other side. A first arc groove (181) is provided on one side of the first flat surface (18), and a second arc groove (181) is provided on one side of the second flat surface (19). Two arc-shaped grooves (191), the first positioning hole (11) passes through the first flat surface (18) and the second arc-shaped groove (191), the second positioning hole (12) passes through the second flat surface (19) and the first arc-shaped groove (181); the first positioning inclined surface (13) and the second positioning inclined surface (14) form a "V" shaped structure, and the bottom of the cutter head (1) is provided with a bottom surface (15), and the first positioning inclined surface (13) and the second positioning inclined surface (14) extend to the bottom surface (15).

4. The modular cutting tool according to claim 3, characterized in that, The bottom surface (15) is provided with a groove (16), and the top of the blade (1) is provided with a blade tip (17).

5. The modular cutting tool according to claim 3, characterized in that, The head module (2) includes a first spiral groove (26) and a mounting part (25). The mounting part (25) is located on both sides of the top of the head module (2). A blade (252) is mounted on the mounting part (25). The mounting part (25) is provided with a blade mounting hole (251). The blade (252) is provided with a blade hole (253). The blade mounting hole (251) and the blade hole (253) are adapted to each other. The blade (252) is fixedly mounted on the mounting part (25) by bolts passing through the blade mounting hole (251) and the blade hole (253).

6. The modular cutting tool according to claim 5, characterized in that, The top of the head module (2) is provided with a mounting groove (27). Fixing blocks (23) are provided on both sides of the mounting groove (27). Each fixing block (23) is provided with a blade mounting hole (231). The two blade mounting holes (231) correspond to the first positioning hole (11) and the second positioning hole (12) respectively. The blade (1) is installed in the mounting groove (27) by passing through the two blade mounting holes (231), the first positioning hole (11) and the second positioning hole (12) with screws, and abuts against the fixing blocks (23). The mounting groove (27) is provided with inclined surfaces (28) on both sides. The fixing block (23) is provided with a positioning surface (271) on the side near the mounting groove (27). The two positioning surfaces (271) abut against the first flat surface (18) and the second flat surface (19) respectively. The two inclined surfaces (28) abut against the first positioning inclined surface (13) and the second positioning inclined surface (14) respectively.

7. The modular cutting tool according to claim 6, characterized in that, The tool holder (3) includes a clamping part (38), which is a cylinder. A clamping plane (31) is provided on the cylindrical surface of the clamping part (38). A backing part (34) is provided at one end of the clamping part (38). A connecting part (35) is provided at the end of the backing part (34) away from the clamping part (38). At least one second spiral groove (36) is provided on the surface of the connecting part (35). The center lines of the clamping part (38), the backing part (34) and the connecting part (35) are the same. A slot (33) is also provided between the backing part (34) and the clamping part (38). The outer diameter of the slot (33) is smaller than the outer diameter of the clamping part (38). The outer diameter of the backing part (34) is larger than the outer diameter of the clamping part (38). The outer diameter of the backing part (34) is greater than or equal to the outer diameter of the connecting part (35).

8. The modular cutting tool according to claim 7, characterized in that, One end of the second spiral groove (36) extends to the end of the connecting part (35) near the abutment part (34), where the spiral angle of the second spiral groove (36) is 0° to 20°; the other end of the second spiral groove (36) extends to the top of the connecting part (35) and intersects with the first spiral groove (26) on the head module (2), where the spiral angle of the second spiral groove (36) is 20° to 60°.

9. The modular cutting tool according to claim 8, characterized in that, The waist-shaped groove (37) is also provided with an internal cooling hole (372), and the tool bar (3) is provided with a through hole (32). The through hole (32) extends to the bottom end of the clamping part (38), and the through hole (32) is connected to the internal cooling hole (372). The head module (2) is provided with a number of cooling holes (24), and the internal cooling hole (372) is connected to the number of cooling holes (24).

10. The modular cutting tool according to any one of claims 1-9, characterized in that, The cutter head (1) and the head module (2) are in clearance fit, and the waist-shaped groove (37) of the cutter bar (3) and the waist-shaped key (21) of the head module (2) are in clearance fit.

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