A PCBN tool for screw nut processing

Abstract

The present application relates to the technical field of metal cutting tools, and in particular to a PCBN tool for processing lead screw nuts, comprising a PCBN blade, a tool holder, a tool holder, a pressure block, and a locking screw. The tool holder has a blade mounting hole and a pressure block mounting hole, which are interconnected. The blade mounting hole is formed on a circumferential side wall of the tool holder, and the pressure block mounting hole is formed at one end of the tool holder. The PCBN blade is formed with a pressing flat surface and a mounting arc surface, and the blade mounting hole is formed with the arc surface. The PCBN blade is positioned by the engagement of the mounting arc surface and the arc surface. The pressure block has a screw locking hole and a blade pressing and positioning surface, and the locking screw secures the pressure block through the screw locking hole. The blade pressing and positioning surface of the pressure block aligns with the pressing flat surface of the PCBN blade, so that the angle between the blade pressing and positioning surface and the axis of the pressure block is consistent with the angle between the pressing flat surface and the axis of symmetry of the tool holder. The tool holder is connected to the tool holder. This application solves the problem of the inability to adjust the pressure angle of existing blades used in lead screw nut processing.

Description

Technical Field

[0001] The present application relates to the field of metal cutting tool technology, and in particular to a PCBN tool for processing screw nuts. Background Art

[0002] The ball screw nut pair is a spiral transmission element with balls as rolling elements between the screw and the nut pair. It is the most precise and most commonly used transmission device in current transmission machinery. Therefore, the thread manufacturing accuracy of the screw nut will directly affect the transmission accuracy of the screw.

[0003] The main methods for processing lead screw nuts described in related technologies are turning and grinding. Grinding involves grinding the lead screw nut using a grinder. However, this method has low production efficiency and requires a large amount of grinding wheels and abrasives. Therefore, grinding is generally only used for high-precision lead screw nut processing and is rarely used. Turning, on the other hand, is performed using cutting equipment such as lathes. It offers high precision and can be mass-produced. Therefore, turning is a more widely used method.

[0004] Existing turning inserts are generally PCBN tools. Cubic boron nitride (CBN) has the characteristics of high hardness, good wear resistance, high temperature resistance, and high chemical stability. The processed polycrystalline cubic boron nitride (PCBN) also has the advantages of high thermal conductivity and low friction coefficient. When used as a tool, PCBN is particularly suitable for processing various difficult-to-process materials due to its high hardness, good chemical stability, and good red hardness. Turning inserts are available in two types: welded and clip-on. However, when turning screw nuts, these tools have the problem of low blade utilization due to the inability to adjust the pressure angle. Therefore, there is an urgent need to design a PCBN tool for screw nut processing to solve the problem of low blade utilization due to the inability to adjust the pressure angle. Summary of the Invention

[0005] In order to solve the problem that the pressure angle of the existing screw nut processing blade cannot be adjusted and to improve the utilization rate of the blade, the present application provides a PCBN tool for screw nut processing.

[0006] The present application provides a PCBN tool for processing screw nuts using the following technical solutions:

[0007] A PCBN tool for processing a screw nut, comprising a PCBN blade, a tool holder, a tool holder, a pressing block and a locking screw;

[0008] The tool holder is provided with a blade mounting hole and a pressure block mounting hole. The blade mounting hole is provided on the circumferential side wall of the tool holder for mounting the PCBN blade. The pressure block mounting hole is provided at one end of the tool holder for mounting the pressure block. The blade mounting hole is connected to the pressure block mounting hole.

[0009] The PCBN blade is formed with a pressing plane and a mounting arc surface, and the blade mounting hole is formed with an arc surface, and the PCBN blade is positioned by the cooperation between the mounting arc surface and the arc surface;

[0010] The pressing block is provided with a screw locking hole and is formed with a blade pressing positioning surface, and the locking screw locks the pressing block in the pressing block mounting hole through the screw locking hole;

[0011] The blade pressing and positioning surface of the pressing block is fitted with the pressing plane of the PCBN blade, so that the angle between the blade pressing and positioning surface and the axis of the pressing block is consistent with the angle between the pressing plane and the symmetry axis of the tool holder;

[0012] The knife handle is connected to the knife seat.

[0013] By adopting the above technical solution, during installation, one end of the PCBN blade is inserted into the blade mounting hole. The blade's mounting arc surface cooperates with the arc surface within the blade mounting hole to achieve blade positioning. The pressure block is then inserted into the pressure block mounting hole, and the locking screw locks the pressure block into the pressure block mounting hole through the screw locking hole. This way, the pressure block's blade pressing surface aligns with the PCBN blade's pressing plane, ensuring that the angle between the pressure block's blade pressing surface and the pressure block's axis is consistent with the angle between the PCBN blade's pressing plane and the toolholder's axis of symmetry. When the angle between the pressure block's blade pressing surface and the pressure block's axis varies, the PCBN blade will have different pressure angles when machining the screw nut raceway. This eliminates the need to replace the PCBN blade and toolholder; the pressure angle can be adjusted during machining simply by replacing a different pressure block, providing convenient and flexible operation.

[0014] Optionally, the PCBN blade is integral or welded.

[0015] By adopting the above technical solution, PCBN inserts can be designed as either integral or welded, depending on the actual situation, achieving diversified designs. PCBN inserts offer flexible structure, can be welded as a whole, are reliably positioned and installed, and offer high grinding or resharpening precision, further reducing tool costs.

[0016] Optionally, the PCBN blade is a PCBN composite sheet or an integral PCBN, and the PCBN blade is formed with a cutter head arc surface, a first side surface and a third side surface, the first side surface and the third side surface are symmetrical about the symmetry axis of the PCBN blade, the first side surface, the cutter head arc surface and the third side surface are connected together in sequence, and the first side surface and the third side surface respectively form an inclination angle, and the inclination angle range of the first side surface and the third side surface is 3°-30°.

[0017] By adopting the above technical solution, if the inclination angles of the first side surface and the third side surface are too small, the cutting effect will be affected; if the inclination angles of the first side surface and the third side surface are too large, the strength of the PCBN insert cannot be guaranteed.

[0018] Optionally, the PCBN blade is further formed with an adjustment surface, a second side surface, and a fourth side surface, the second side surface and the fourth side surface are symmetrical about the symmetry axis of the PCBN blade, the cutter head arc surface, the first side surface, the second side surface, the adjustment surface, the fourth side surface and the third side surface are connected end to end in sequence, and the angle between the second side surface and the fourth side surface and the clamping plane is in the range of 120°-150°.

[0019] By adopting the above technical solution, the angle between the second side surface and the fourth side surface and the pressing plane is too small, which will reduce the supporting strength of the installation arc surface.

[0020] Optionally, the PCBN blade is further formed with a bottom surface, and the bottom surface and the pressing plane are arranged parallel to each other, and both the pressing plane and the bottom surface are clamping and positioning surfaces for blade grinding.

[0021] By adopting the above technical solution, the machined surfaces except the pressing plane and the bottom surface can be clamped and ground in one step, which can reduce the number of clamping times and improve the tool grinding accuracy.

[0022] Optionally, the PCBN blade is a welded type, and the PCBN blade includes a cutter head and a base, and the cutter head and the base are non-detachably connected together by vacuum welding.

[0023] By adopting the above technical solution, the cutter head and the base are inseparably connected together through vacuum welding, which can reduce the use of expensive material PCBN and further reduce the cost of the tool.

[0024] Optionally, an arc-shaped surface is formed in the screw locking hole of the pressing block, and the arc-shaped surface can cooperate with the conical surface on the locking screw.

[0025] By adopting the above technical solution, the locking screw locks the pressing block in the pressing block installation hole through the screw locking hole, thereby ensuring the stability of the pressing block installation.

[0026] Optionally, an adjusting screw is further included for positioning and adjusting the position of the PCBN blade in the blade mounting hole.

[0027] By adopting the above technical solution, the overhang length of the PCBN blade in the blade mounting hole along the radial direction of the blade seat can be adjusted, thereby ensuring that the overhang length of the PCBN blade after grinding is consistent with that of a new blade, facilitating the use of the PCBN blade and improving the utilization rate of the PCBN blade.

[0028] Optionally, the pressure block is a polygonal structure, and a first pressure block installation positioning plane and a second pressure block installation positioning plane are formed on the pressure block, and a first plane and a second plane are formed in the pressure block installation hole, and the first pressure block installation positioning plane, the second pressure block installation positioning plane, the first plane and the second plane cooperate with each other.

[0029] By adopting the above technical solution, the first pressing block installation and positioning plane, the second pressing block installation and positioning plane, the first plane and the second plane cooperate with each other, so as to prevent the pressing block from rotating along its symmetry center.

[0030] Optionally, a first welding surface is formed on the knife handle, and a second welding surface is formed on the knife seat. The knife handle and the knife seat are non-detachably connected by vacuum welding through the first welding surface and the second welding surface, and the symmetry axis of the knife handle and the symmetry axis of the knife seat are on the same straight line.

[0031] By adopting the above technical solution, the tool holder and the tool seat are integrated into one, ensuring the accurate installation precision of the PCBN blade.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. The present application provides a PCBN tool for processing screw nuts, wherein a blade mounting hole with a circular arc cross-section is provided on the circumferential side wall of the tool holder, and a pressure block mounting hole is provided on one end face of the tool holder, and the blade mounting hole and the pressure block mounting hole are connected. When one end of the blade is installed in the blade mounting hole, the mounting and positioning circular arc surface on the blade is matched and positioned with the circular arc surface of the blade mounting hole. The pressure block is inserted into one end of the pressure block mounting hole, and the blade pressing and positioning surface on the pressure block is matched with the pressing plane on the blade. At the same time, the blade mounting hole with the circular arc surface presses and fixes the blade, so that the angle of the pressing plane on the blade is consistent with the blade pressing and positioning surface, and the blade is pressed. Therefore, there is no need to replace the blade or the tool holder, and the pressure angle of the PCBN blade when processing the screw nut raceway can be adjusted by replacing the pressure block with a blade pressing and positioning surface at a different angle.

[0034] 2. In this application, the adjustment surface cooperates with the adjustment surface of the adjustment screw to adjust the overhang length of the PCBN blade in the blade mounting hole along the radial direction of the blade seat, thereby ensuring that the overhang length of the PCBN blade after grinding is consistent with that of the new blade, facilitating the use of the PCBN blade and improving the utilization rate of the PCBN blade;

[0035] 3. In this application, the PCBN blade has a flexible structure, can be welded as a whole, has reliable positioning and installation, and has high grinding or re-grinding precision, further reducing the cost of tool use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic structural diagram of the first PCBN tool for screw nut processing in this application;

[0037] Figure 2 This is an exploded view of the first PCBN tool for screw nut machining in this application;

[0038] Figure 3 This is a schematic structural diagram of a PCBN blade in the first PCBN tool for processing a screw nut in the present application;

[0039] Figure 4 This is a side view of a PCBN insert in the first PCBN tool for screw nut machining in the present application;

[0040] Figure 5 This is a schematic structural diagram of a tool holder in the first PCBN tool for screw nut processing in this application;

[0041] Figure 6 This is a cross-sectional view of a tool holder in the first PCBN tool for processing a screw nut in the present application;

[0042] Figure 7 yes Figure 6 The cross-sectional view of AA in FIG;

[0043] Figure 8 This is a side view of the first PCBN tool for screw nut machining in this application;

[0044] Figure 9 This is a schematic structural diagram of the first PCBN tool for screw nut processing in this application;

[0045] Figure 10 This is a schematic structural diagram of a PCBN blade in a second PCBN tool for processing a screw nut in the present application;

[0046] Figure 11 It is a structural schematic diagram of the PCBN blade in the third PCBN tool for processing screw nuts in this application.

[0047] Explanation of the accompanying reference numerals: 1. locking screw; 2. PCBN blade; 21. pressing plane; 22. mounting arc surface; 23. cutter head arc surface; 24. first side surface; 25. third side surface; 26. adjustment surface; 27. second side surface; 28. bottom surface; 29. ​​fourth side surface; 210. cutter head; 211. base; 3. tool holder; 31. first welding surface; 4. tool holder; 41. blade mounting hole; 411. arc surface; 42. pressure block mounting hole; 421. first plane; 422. second plane; 43. second welding surface; 44. pressure block locking hole; 45. adjustment screw hole; 5. pressure block; 51. blade pressing positioning surface; 52. first pressure block mounting positioning plane; 53. second pressure block mounting positioning plane; 54. screw locking hole; 541. arc surface; 6. adjustment screw. DETAILED DESCRIPTION

[0048] The following is combined with Figure 1-11 This application is described in further detail.

[0049] Example 1:

[0050] This embodiment discloses a first PCBN tool for screw nut processing, referring to Figure 1 and Figure 2 The PCBN tool for screw nut machining includes a PCBN blade 2, a tool holder 3, a tool holder 4, a pressure block 5, and a locking screw 1. The tool holder 3 is connected to the tool holder 4. The tool holder 4 is provided with a blade mounting hole 41 for mounting the PCBN blade 2 and a pressure block mounting hole 42 for mounting the pressure block 5. The blade mounting hole 41 is provided on the circumferential side wall of the tool holder 4, and the pressure block mounting hole 42 is provided at one end of the tool holder 4. The blade mounting hole 41 and the pressure block mounting hole 42 are connected.

[0051] Reference Figure 2 and Figure 3 The PCBN blade 2 is formed with a flat pressing surface 21 and a circular mounting surface 22. A circular mounting surface 411 is formed within the blade mounting hole 41. The PCBN blade 2 is positioned by the cooperation of the circular mounting surface 22 and the circular mounting surface 411. The pressure block 5 is formed with a blade pressing and positioning surface 51. The blade pressing and positioning surface 51 of the pressure block 5 aligns with the pressing surface 21 of the PCBN blade 2, ensuring that the angle between the blade pressing and positioning surface 51 and the axis of the pressure block 5 is consistent with the angle between the blade pressing surface 21 and the axis of symmetry of the blade holder 4.

[0052] During installation, first insert the PCBN blade 2 into the blade mounting hole 41, using the mounting arc surface 22 and the arc surface 411 to mate and position the blade. Then, insert the pressure block 5 into the pressure block mounting hole 42 and secure it with the locking screw 1. Because the blade pressing surface 51 of the pressure block 5 aligns with the pressing plane 21 of the PCBN blade 2, the angle between the blade pressing surface 51 of the pressure block 5 and the axis of the pressure block 5 is consistent with the angle between the pressing plane 21 of the PCBN blade 2 and the axis of symmetry of the tool holder 4. Therefore, when the angle between the blade pressing surface 51 of the pressure block 5 and the axis of the pressure block 5 changes, the angle between the pressing plane 21 of the PCBN blade 2 and the axis of symmetry of the tool holder 4 also changes accordingly, thereby adjusting the pressure angle during machining. This allows adjustment of the pressure angle during machining simply by replacing a different pressure block 5, providing convenient and flexible operation.

[0053] Specifically, refer to Figure 3 and Figure 4 The PCBN blade 2 is a monolithic piece, made of a PCBN composite sheet or solid PCBN. The PCBN blade 2 also includes a circular blade surface 23, a first side surface 24, a third side surface 25, an adjustment surface 26, a second side surface 27, a bottom surface 28, and a fourth side surface 29. The first side surface 24 and the third side surface 25 are symmetrical about the axis of symmetry of the PCBN blade 2. The first side surface 24, the circular blade surface 23, and the third side surface 25 are sequentially connected to form a V-shaped cutting surface. The first side surface 24 and the third side surface 25 each have an inclination angle, ranging from 3° to 30°. Too small an inclination angle of the first side surface 24 or the third side surface 25 will affect the cutting effect, while too large an inclination angle of the first side surface 24 or the third side surface 25 will not ensure the strength of the PCBN blade 2. In this embodiment, the inclination angle is preferably 7°.

[0054] Furthermore, in this embodiment, the cutter head arc surface 23 performs the primary cutting function. It is symmetrical about the axis of symmetry of the PCBN insert 2, and the clearance angle of the cutter head arc surface 23 ranges from 5° to 20°. In this embodiment, 7° is preferred, but other embodiments may also have clearance angles of 5°, 11°, 15°, or 20°. This ensures optimal cutting performance while maintaining the strength of the PCBN insert 2.

[0055] Reference Figure 2 and Figure 3The second side surface 27 and the fourth side surface 29 are symmetrical about the axis of symmetry of the PCBN insert 2. The arcuate surface 23, the first side surface 24, the second side surface 27, the adjustment surface 26, the fourth side surface 29, and the third side surface 25 are sequentially connected end to end. Two arcuate mounting surfaces 22 are formed. The second side surface 27 is vertically connected to the arcuate mounting surface 22 and is located between the bottom surface 28 and the pressing plane 21. The fourth plane is vertically connected to the other arcuate mounting surface 22 and is located between the bottom surface 28 and the pressing plane 21. The angle between the second side surface 27 and the fourth side surface 29 and the pressing plane 21 ranges from 120° to 150°. A too small angle between the second side surface 27 and the fourth side surface 29 and the pressing plane 21 will reduce the supporting strength of the arcuate mounting surface. In this embodiment, the angle is preferably 120°.

[0056] It should be noted that, referring to Figure 3 and Figure 4 The bottom surface 28 and the pressing surface 21 are arranged parallel to each other, and both the pressing surface 21 and the bottom surface 28 are clamping and positioning surfaces for blade grinding. This allows the machining of all surfaces except the pressing surface 21 and the bottom surface 28 to be completed in one clamping and grinding operation, thus reducing the number of clamping operations and improving the tool grinding accuracy.

[0057] Reference Figure 5 and Figure 6 A first welding surface 31 is formed on the shank 3. The first welding surface 31 is two intersecting straight lines, that is, the first welding surface 31 is symmetrical about the radial symmetry axis of the shank 3. It can be understood that the first welding surface 31 is V-shaped, and the first welding surface 31 forms an arc transition at the bending point to facilitate connection with the tool holder 4.

[0058] Reference Figure 5 and Figure 6 A second welding surface 43 is formed on the tool holder 4. The second welding surface 43 is two intersecting straight lines, that is, the second welding surface 43 is symmetrical about the radial symmetry axis of the tool holder 4. It can be understood that the first welding surface 31 and the second welding surface 43 are equivalent to the relationship between the groove and the protrusion. The second welding surface 43 is V-shaped, and the second welding surface 43 is formed with an arc transition at the bending point to facilitate connection with the tool handle 3.

[0059] The tool shank 3 and tool holder 4 are inseparably connected by vacuum welding via a first welding surface 31 and a second welding surface 43. The axes of symmetry of the tool shank 3 and the tool holder 4 are aligned, and the angle and transition arc of the first welding surface 31 correspond to and are equal to those of the second welding surface 43. This ensures that the tool shank 3 and tool holder 4 form a single unit, preventing loosening or misalignment during machining, ensuring accurate installation of the PCBN insert 2.

[0060] Of course, the knife handle 3 and the knife seat 4 are both formed with round chamfers to reduce the sharpness of the edges of the knife handle 3 and the knife seat 4, thereby playing a safety protection role.

[0061] Reference Figure 7 、 Figure 8 and Figure 9 The pressure block 5 has a polygonal structure. A first pressure block installation positioning plane 52 and a second pressure block installation positioning plane 53 are formed on the pressure block 5. A first plane 421 and a second plane 422 are formed in the pressure block installation hole 42. The first plane 421 and the second plane 422 are symmetrically distributed about the symmetry axis of the pressure block installation hole 42. The first pressure block installation positioning plane 52, the second pressure block installation positioning plane 53, the first plane 421 and the second plane 422 cooperate with each other. When the pressure block 5 is installed in the pressure block installation hole 42, the angle formed by the first plane 421 and the second plane 422 is the same as the angle formed by the first pressure block installation positioning plane 52 and the second pressure block installation positioning plane 53. This cooperative relationship prevents the pressure block 5 from rotating about its center of symmetry.

[0062] Further, refer to Figure 6 and Figure 9 The pressure block 5 is provided with a screw locking hole 54, and the tool holder 4 is provided with a pressure block locking hole 44. The screw locking hole 54 is formed with an arc-shaped surface 541, which mates with the tapered surface on the locking screw 1. The axes of symmetry of the pressure block 5, the locking screw 1, and the pressure block mounting hole 42 are aligned. The external threads of the locking screw 1 and the internal threads of the pressure block locking hole 44 secure the pressure block 5 within the pressure block locking hole 44, thereby achieving stable fixation of the pressure block 5 and reducing the possibility of loosening during processing.

[0063] Reference Figure 2 and Figure 7 The blade holder 4 also has an adjustment screw hole 45, into which an adjustment screw 6 is threaded. The adjustment screw 6 is used to position and adjust the position of the PCBN blade 2 relative to the blade mounting hole 41. Thus, when the PCBN blade 2 wears after use and its length is reduced after die reshaping, resulting in a reduced radial overhang of the PCBN blade 2 in the blade holder 4, the adjustment screw 6 can be adjusted to keep the radial overhang of the blade in the blade holder 4 consistent with that of a new blade after die reshaping. This facilitates the use of the PCBN blade 2 and improves its utilization rate.

[0064] The working principle of a PCBN tool for screw nut machining in this embodiment is as follows: During installation, one end of the adjustment surface 26 of the PCBN blade 2 is inserted into the blade mounting hole 41. The blade's arcuate mounting surface 22 and the arcuate surface 411 within the blade mounting hole 41 cooperate to achieve blade positioning. Then, the pressure block 5 is inserted into the pressure block mounting hole 42, and the locking screw 1 is secured within the pressure block mounting hole 42 via the screw locking hole 54. The radial overhang of the PCBN blade 2 in the blade mounting hole 41 can be adjusted using the adjustment screw 6. This allows the blade pressing and positioning surface 51 of the pressure block 5 to align with the pressing plane 21 of the PCBN blade 2, ensuring that the angle between the blade pressing and positioning surface 51 of the pressure block 5 and the axis of the pressure block 5 is consistent with the angle between the pressing plane 21 of the PCBN blade 2 and the axis of symmetry of the tool holder 4. This eliminates the need to replace the PCBN blade 2 and tool holder 4; simply by replacing a different pressure block 5, the pressure angle can be adjusted during machining, providing convenient and flexible operation. At the same time, after repeated grinding, the overhang length of the PCBN blade 2 can be adjusted by adjusting the screw 6 to be consistent with the new blade, which facilitates operation, improves blade utilization, and reduces tool costs.

[0065] Example 2:

[0066] Reference Figure 10 This embodiment discloses a second PCBN tool for processing screw nuts. The difference between the PCBN tool in this embodiment and the PCBN tool in the first embodiment is that the PCBN blade 2 in the second embodiment is a welded blade.

[0067] Specifically, the PCBN insert 2 in this embodiment includes a blade head 210 and a base body 211, which are inseparably connected via vacuum welding. This inseparably connected blade head 210 and base body 211 reduces the use of expensive PCBN, further reducing tool costs.

[0068] Furthermore, the material of the cutter head 210 can be selected as PCBN, and the material of the substrate 211 can be selected as cemented carbide.

[0069] Example 3:

[0070] Reference Figure 11 This embodiment discloses a third PCBN tool for processing screw nuts. The PCBN tool in this embodiment differs from the PCBN tool in the first embodiment in that the mounting arc surface 22 is an integral arc surface 411 and a bottom surface 28 (grinding positioning clamping surface) is formed at its bottom.

[0071] Compared with the first embodiment, the contact area between the mounting arc surface 22 and the blade mounting hole 41 is larger in this embodiment, and the mounting positioning is more stable and reliable. At the same time, the formed grinding mounting surface can still ensure that the PCBN blade 2 can be ground into a processing surface other than the pressing plane 21 and the grinding positioning clamping surface in one installation, and the quality of the PCBN blade 2 can still be guaranteed.

[0072] Example 4:

[0073] This embodiment discloses a third PCBN tool for screw nut machining. The PCBN tool in this embodiment differs from the PCBN tool in the first embodiment in that it combines the differences of the second and third embodiments. This improves installation stability and reduces the use of expensive PCBN, further reducing tool costs. This embodiment will not be further described in detail.

[0074] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A PCBN tool for processing screw nuts, characterized by: It comprises a PCBN blade (2), a tool handle (3), a tool seat (4), a pressure block (5) and a locking screw (1); The knife seat (4) is provided with a blade mounting hole (41) and a pressure block mounting hole (42); the blade mounting hole (41) is provided on the circumferential side wall of the knife seat (4) for mounting the PCBN blade (2); the pressure block mounting hole (42) is provided at one end of the knife seat (4) for mounting the pressure block (5); the blade mounting hole (41) and the pressure block mounting hole (42) are in communication; The PCBN blade (2) is formed with a pressing plane (21) and a mounting arc surface (22); a circular arc surface (411) is formed in the blade mounting hole (41); and the PCBN blade (2) is positioned by the cooperation between the mounting arc surface (22) and the circular arc surface (411); The pressing block (5) is provided with a screw locking hole (54) and is formed with a blade pressing positioning surface (51); the locking screw (1) locks the pressing block (5) in the pressing block mounting hole (42) through the screw locking hole (54); The blade pressing and positioning surface (51) of the pressing block (5) is fitted with the pressing plane (21) of the PCBN blade (2), so that the angle between the blade pressing and positioning surface (51) and the axis of the pressing block (5) is consistent with the angle between the pressing plane (21) and the symmetry axis of the blade seat (4); The knife handle (3) is connected to the knife seat (4).

2. The PCBN tool for screw nut processing according to claim 1, characterized in that: The PCBN blade (2) is of an integral type or a welded type.

3. The PCBN tool for screw nut processing according to claim 2, characterized in that: The PCBN blade (2) is a PCBN composite sheet or an integral PCBN. The PCBN blade (2) is formed with a blade arc surface (23), a first side surface (24) and a third side surface (25). The first side surface (24) and the third side surface (25) are symmetrical about the symmetry axis of the PCBN blade (2). The first side surface (24), the blade arc surface (23) and the third side surface (25) are connected together in sequence. The first side surface (24) and the third side surface (25) are respectively formed with an inclination angle. The inclination angles of the first side surface (24) and the third side surface (25) are both in the range of 3°-30°.

4. The PCBN tool for screw nut processing according to claim 3, characterized in that: The PCBN blade (2) is further formed with an adjustment surface (26), a second side surface (27), and a fourth side surface (29); the second side surface (27) and the fourth side surface (29) are symmetrical about the symmetry axis of the PCBN blade (2); the blade arc surface (23), the first side surface (24), the second side surface (27), the adjustment surface (26), the fourth side surface (29), and the third side surface (25) are sequentially connected end to end; and the angle between the second side surface (27) and the fourth side surface (29) and the pressing plane (21) is in the range of 120°-150°.

5. The PCBN tool for screw nut processing according to claim 4, characterized in that: The PCBN blade (2) is further formed with a bottom surface (28), and the bottom surface (28) and the pressing plane (21) are arranged parallel to each other, and the pressing plane (21) and the bottom surface (28) are both clamping and positioning surfaces for blade grinding.

6. The PCBN tool for processing a screw nut according to claim 2, characterized in that: The PCBN blade (2) is of a welded type, comprising a blade head (210) and a base body (211), wherein the blade head (210) and the base body (211) are non-detachably connected together by vacuum welding.

7. The PCBN tool for screw nut processing according to claim 1, characterized in that: A circular arc surface (541) is formed in the screw locking hole (54) of the pressing block (5), and the circular arc surface (541) can cooperate with the conical surface on the locking screw (1).

8. The PCBN tool for screw nut machining according to claim 1, characterized in that: It also includes an adjusting screw (6) for positioning and adjusting the position of the PCBN blade (2) in the blade mounting hole (41).

9. The PCBN tool for screw nut processing according to claim 1, characterized in that: The pressing block (5) is a polygonal structure, a first pressing block installation positioning plane (52) and a second pressing block installation positioning plane (53) are formed on the pressing block (5), a first plane (421) and a second plane (422) are formed in the pressing block installation hole (42), and the first pressing block installation positioning plane (52), the second pressing block installation positioning plane (53), the first plane (421) and the second plane (422) cooperate with each other.

10. The PCBN tool for screw nut processing according to claim 1, characterized in that: A first welding surface (31) is formed on the knife handle (3), and a second welding surface (43) is formed on the knife seat (4); the knife handle (3) and the knife seat (4) are non-detachably connected by vacuum welding via the first welding surface (31) and the second welding surface (43); and the symmetry axis of the knife handle (3) and the symmetry axis of the knife seat (4) are on the same straight line.

Images