machining mechanism

Abstract

The application discloses a processing mechanism for grinding and passivating a cutting edge of a tool, comprising a grinding disc having a central axis and rotating around the central axis, wherein the grinding disc comprises an inner ring region surrounding the central axis and an outer ring region surrounding the inner ring region and connected with the inner ring region, a passivation cloth arranged on the inner ring region and rotating synchronously with the grinding disc, and a cantilever arranged opposite to the grinding disc and moving towards or away from the grinding disc along a direction parallel to the central axis, wherein the outer ring region grinds the cutting edge of the tool, and the passivation cloth is elastic and configured to passivate the cutting edge of the tool, and the processing mechanism is configured to generate passivation parameters according to a passivation model and passivate the cutting edge of the tool according to the passivation parameters, wherein the passivation parameters comprise at least one of a passivation time, a grinding disc rotating speed, a contact pressure between the cutting edge of the tool and the passivation cloth, and a thickness of the passivation cloth along the central axis. The processing mechanism of the application can grind and passivate the cutting edge of the tool and improve the consistency of the cutting edge.

Description

Technical Field

[0001] This application relates to the field of cutting edge machining technology for cutting tools, and specifically to a machining mechanism. Background Technology

[0002] Diamond tools, with their unique high strength and wear resistance, are commonly used for ultra-precision machining of non-ferrous metals and difficult-to-machine non-metallic materials. After grinding, diamond tools achieve a relatively sharp cutting edge. In actual production, to obtain superior cutting surface quality, not only a sharp cutting edge is needed, but also suitable edge radius, flatness, and consistency. Currently, these requirements are typically met by passivating the diamond tool's cutting edge. Passivated diamond tools exhibit superior microscopic quality of the cutting edge, stable cutting quality, and significantly improved surface roughness. As the quality requirements for diamond tool cutting edges become increasingly stringent, diamond tool passivation has become an indispensable requirement in precision machining technology. However, diamond material is brittle, making diamond tools prone to chipping during the passivation process, thus making it difficult to guarantee passivation quality, and the passivation time is usually quite long. Currently, the industry commonly uses methods such as dragging, abrasive jetting, grinding disc heating, magnetic passivation, and wool wheel brush passivation. Among these, wool wheel brush passivation is the most widely used. This method utilizes a wool wheel containing abrasive particles to perform a relative brushing motion with the cutting edge of a diamond tool. This method can improve the cutting performance, lifespan, and surface quality of diamond tools. However, the aforementioned wool wheel brush passivation method has drawbacks in passivating diamond tool cutting edges, including poor edge uniformity, low surface quality, complex operation, and high processing costs. Therefore, a new diamond tool cutting edge passivation process is urgently needed. Summary of the Invention

[0003] In view of the above, it is necessary to propose a processing mechanism to achieve grinding and dulling of the cutting edge of the tool and improve the consistency of the cutting edge.

[0004] This application provides a processing mechanism for grinding and dulling the cutting edge of a tool, including:

[0005] A grinding disc having a central axis, the grinding disc rotating about the central axis, the grinding disc including an inner ring region surrounding the central axis and an outer ring region surrounding and connected to the inner ring region, the outer ring region grinding the cutting edge of a tool;

[0006] A passivating cloth is disposed in the inner ring area and rotates synchronously with the grinding disc. The passivating cloth is elastic and configured to passivate the cutting edge of the tool.

[0007] A cantilever is disposed opposite to the grinding disc and moves closer to or further away from the grinding disc in a direction parallel to the central axis; the cantilever connects to the cutting tool.

[0008] The processing mechanism is configured to generate passivation parameters based on a passivation model and passivate the cutting edge of the tool based on the passivation parameters. The passivation parameters include at least one of passivation time, grinding disc rotation speed, contact pressure between the cutting edge of the tool and the passivation cloth, and the thickness of the passivation cloth along the central axis.

[0009] In some embodiments, when the passivation time is less than a critical time value, the passivation model satisfies the following condition:

[0010]

[0011] Where R is the cutting edge radius of the tool, t is the passivation time, P is the contact pressure between the cutting edge of the tool and the passivation cloth, L is the cutting edge length of the tool, W is the width of the contact between the cutting edge of the tool and the passivation cloth, d is the diameter of the grinding disc, n is the grinding disc rotation speed, h is the thickness of the passivation cloth along the central axis, E is the elastic modulus of the passivation cloth, and α is the tool wedge angle.

[0012] In some embodiments, when the passivation time is greater than or equal to the critical time value, the passivation model also satisfies the following condition:

[0013]

[0014] Wherein, R is the cutting edge radius of the tool, P is the contact pressure between the cutting edge of the tool and the passivation cloth, L is the cutting edge length of the tool, W is the width of the contact between the cutting edge of the tool and the passivation cloth, and h is the thickness of the passivation cloth along the central axis.

[0015] In some embodiments, after the processing mechanism passivates the cutting edge of the tool according to the passivation parameters, if the passivation result does not meet the passivation requirements, the passivation parameters are reduced by a preset ratio, and the cutting edge of the tool is passivated according to the passivation parameters after the preset ratio is reduced.

[0016] In some embodiments, when the processing mechanism passivates the cutting edge of the tool according to the passivation parameters, it sprays or applies abrasive to the passivation cloth.

[0017] In some embodiments, when the processing mechanism passivates the cutting edge of the tool according to the passivation parameters, the passivation cloth and the back face of the tool are configured to make parallel contact.

[0018] In some embodiments, the passivation fabric is a triclinic polyester velvet fabric.

[0019] In some embodiments, the passivation fabric comprises a plurality of densely distributed fibers, each fiber having a diameter ranging from 1 μm to 3 μm and a length along the central axis ranging from 1 mm to 1.5 mm.

[0020] In some embodiments, the machining mechanism further includes a pressure sensor disposed between the cantilever and the cutting tool, the pressure sensor detecting the pressure between the cutting tool and the outer ring region or the passivation cloth.

[0021] In some embodiments, the processing mechanism further includes a support platform and a spiral pad, the support platform being spaced apart from the grinding disc, the spiral pad being disposed on the support platform and connected to the cantilever, wherein the spiral pad is spaced apart from the cutting tool on the cantilever.

[0022] When machining the cutting edge of a tool using the above-mentioned machining mechanism, passivation parameters are generated based on the parameters of the cutting edge of the tool to be machined and the passivation model. Passivation cloth and grinding disc are assembled according to the passivation parameters. The tool is connected to the cantilever and the cutting edge of the tool is first brought into contact with the outer ring area of ​​the grinding disc. The grinding disc rotates so that the outer ring area grinds the cutting edge of the tool. After grinding the cutting edge of the tool, the cantilever drives the tool to move away from the grinding disc in a direction parallel to the central axis. By coordinating the movement of the grinding disc and the movement of the cantilever, the cutting edge of the tool comes into contact with the passivation cloth on the grinding disc, and the cutting edge of the tool is passivated according to the passivation parameters, thereby achieving passivation of the cutting edge of the tool.

[0023] The processing mechanism of this application embodiment grinds and passivates the cutting edge of the tool through an outer ring region and a passivation cloth, respectively. This achieves an integrated solution where the outer ring region grinds the tool's cutting edge, and the inner ring region, in conjunction with the passivation cloth, passes the cutting edge. The structure is simple, and operation is easy and accurate. The passivation cloth, with its elasticity, uniformly surrounds and presses the cutting edge with elastic stress. The combined elastic load of the passivation cloth removes the cutting edge material in a micro-chip pattern, ensuring the microscopic morphology and quality of the brittle diamond material. This guarantees precise and effective passivation, resulting in good cutting edge consistency, high-quality cutting surface, and reduced chipping. This reduces production difficulty and manufacturing costs. Furthermore, the processing mechanism boasts high grinding and passivation efficiency and short passivation time, reducing the probability of tool scrap and lowering production costs. In addition, by generating passivation parameters through a passivation model, the passivation parameters can be adjusted reasonably, accurately, and quickly according to the parameters of the cutting edge of the tool to be processed, reducing adjustment time and improving processing efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the processing mechanism provided in the embodiments of this application.

[0025] Figure 2yes Figure 1 The diagram shows a cross-sectional view of a cutting edge of a tool when the passivation cloth is used to passivate it.

[0026] Figure 3 yes Figure 2 An enlarged schematic diagram of region III shown.

[0027] Explanation of main component symbols

[0028] Processing mechanism 100

[0029] Grinding wheel 10

[0030] Central axis 11

[0031] Inner circle area 12

[0032] Outer ring area 13

[0033] Central Area 14

[0034] Connecting shaft 15

[0035] Passivation cloth 20

[0036] Fluff 21

[0037] 30 cantilever

[0038] Rod 31

[0039] Connecting part 32

[0040] U-shaped part 33

[0041] Support platform 40

[0042] Spiral pad 50

[0043] 200 knives

[0044] Blade 201

[0045] 202 back face

[0046] Abrasive 300 Detailed Implementation

[0047] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0048] In the description of this application, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, it should be noted that "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows communication between the two components; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] The following will describe some embodiments of this application in detail with reference to the accompanying drawings.

[0051] Please see Figure 1 This application provides a processing mechanism 100 for grinding and passivating the cutting edge 201 of a tool 200 (see [link]). Figure 3 As shown in the figure, the material of the cutting tool 200 can be diamond. The processing mechanism 100 includes a grinding disc 10, a passivation cloth 20, and a cantilever 30. The grinding disc 10 is rotatable, the passivation cloth 20 is disposed on the grinding disc 10 and rotates with the grinding disc 10, the cantilever 30 is disposed opposite to the grinding disc 10 and located above the grinding disc 10, and the cantilever 30 is used to connect the cutting tool 200 so as to drive the cutting tool 200 closer to or further away from the grinding disc 10 and the passivation cloth 20.

[0052] The grinding disc 10 has a disc-shaped structure and a central axis 11. The grinding disc 10 can rotate around the central axis 11. The grinding disc 10 includes an inner ring region 12 surrounding the central axis 11 and an outer ring region 13 surrounding and connected to the inner ring region 12. The outer ring region 13 grinds the cutting edge 201 of the tool 200. The inner ring region 12 and the outer ring region 13 share the same central axis 11. In this embodiment, the grinding disc 10 can be a grinding cast iron disc. The grinding disc 10 also includes a central region 14 and a connecting shaft 15 connected to the lower part of the central region 14. The inner ring region 12 surrounds and connects to the central region 14. The central axis 11 passes through the center of the central region 14. The connecting shaft 15 can be connected to an external spindle (not shown) so that the external spindle drives the grinding disc 10 to rotate around the central axis 11 via the connecting shaft 15. It can be understood that the external spindle can also drive the grinding disc 10 to translate or perform other movements via the connecting shaft 15.

[0053] Please refer to the above. Figure 2 and Figure 3 The passivation cloth 20 is disposed in the inner ring region 12 and can rotate synchronously with the grinding disc 10. The passivation cloth 20 is elastic and configured to passivate the cutting edge 201 of the tool 200. The passivation cloth 20 includes a plurality of densely distributed fibers 21. The passivation cloth 20 can be flattened and pressed into the inner ring region 12 of the grinding disc 10 using Velcro or adhesive. The passivation cloth 20 has a ring-shaped structure, that is, the passivation cloth 20 avoids the central region 14 of the grinding disc 10. The passivation cloth 20 can be a triclinic polyester velvet cloth, which has the characteristics of elasticity, stability and reliability. The material of the triclinic polyester velvet cloth can be PET (polybutylene terephthalate). PET belongs to the triclinic crystal system. The macromolecular chains of PET are triclinic. The crystal faces and crystals of PET material are asymmetrical, and the methylene chain segments are not completely straightened, thus giving the triclinic polyester velvet cloth the characteristics of elasticity, stability and reliability. The triclinic polyester velvet cloth used to passivate the cutting edge 201 of the tool 200 has a flat, upright surface with uniform elasticity. The elastic load of adjacent fibers 21 superimposed on the cutting edge 201 of the tool 200, and the adjacent fibers 21 generate a continuous uniform elastic confining strain force after being compressed.

[0054] In this embodiment, the diameter of each fluff 21 of the passivation cloth 20 is approximately 1 μm to 3 μm, for example, 1 μm, 1.2 μm, 1.5 μm, 1.8 μm, 2 μm, 2.2 μm, 2.5 μm, 2.8 μm, 3 μm, etc., and the length of each fluff 21 along the central axis 11 is approximately 1 mm to 1.5 mm, for example, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc., preferably 1.2 mm. In this way, by limiting the diameter and length range of the fluff 21, the fluff 21 can generate a continuous and uniform elastic confining pressure strain after contacting and being compressed with the cutting edge 201 of the tool 200. However, when the diameter of the fibers 21 is less than 1 μm, the elasticity generated by the fibers 21 under pressure is weak, resulting in a weakening or loss of elasticity in the passivation cloth 20. When the diameter of the fibers 21 is greater than 3 μm, the fibers 21 are not easily deformed under pressure, resulting in weak elasticity in the passivation cloth 20. When the length of the fibers 21 is less than 1 mm, the fibers 21 cannot fully support the cutting edge 201 of the tool 200 after deformation under pressure, resulting in a weakening of elasticity in the passivation cloth 20. When the length of the fibers 21 is greater than 1.5 mm, the fibers 21 are prone to irreversible deformation under pressure, resulting in a weakening or loss of elasticity in the passivation cloth 20.

[0055] The cantilever 30 is positioned opposite to the grinding disc 10 and can move closer to or further away from the grinding disc 10 in a direction parallel to the central axis 11. One end of the cantilever 30 is connected to the cutting tool 200.

[0056] In this embodiment, the processing mechanism 100 further includes a support platform 40 and a spiral pad 50. The support platform 40 is spaced apart from the grinding disc 10, that is, the support platform 40 is located on one side of the grinding disc 10. The spiral pad 50 is located on the support platform 40 and connected to the cantilever 30. The spiral pad 50 is spaced apart from the tool 200 on the cantilever 30. By rotating the spiral pad 50, the cantilever 30 can be moved in a direction parallel to the central axis 11. Specifically, the cantilever 30 includes a rod 31, a connecting part 32, and a U-shaped part 33. The connecting part 32 is connected to one end of the rod 31 and is connected to the tool 200. The U-shaped part 33 is connected to the other end of the rod 31. There are two spiral pads 50, and each spiral pad 50 is connected to the U-shaped part 33. Thus, by setting up the aforementioned support platform 40 and spiral pad 50, the cantilever 30 can move in a direction parallel to the central axis 11. The cantilever 30 can be raised or lowered by rotating the spiral pad 50 to maintain its movement in the direction parallel to the central axis 11. The adjustment of the cantilever 30 is simple, and stepless adjustment can be achieved by rotating the spiral pad 50, improving the versatility of the machining mechanism 100. Furthermore, by setting the specific structure of the cantilever 30, it has three support points, ensuring that the cantilever 30 connects to the tool 200, and that the cutting edge 201 of the tool 200 has high stability during grinding and dulling, thereby ensuring the precision of the cutting edge 201 during machining.

[0057] In this embodiment, the processing mechanism 100 is configured to generate passivation parameters based on the passivation model and passivate the cutting edge 201 of the tool 200 based on the passivation parameters. The passivation parameters include at least one of the following: passivation time, grinding wheel speed, contact pressure between the cutting edge 201 of the tool 200 and the passivation cloth 20, and the thickness of the passivation cloth 20 along the central axis 11. Understandably, before actual processing, the parameters of the cutting edge 201 of the tool 200 to be processed are known, such as the radius of the cutting edge 201 and the length of the cutting edge 201. The processing mechanism 100 generates passivation parameters based on the radius of the cutting edge 201, the length of the cutting edge 201, and the passivation model. Based on the passivation parameters, at least one of the following is adjusted: passivation time, grinding wheel speed, contact pressure between the cutting edge 201 of the tool 200 and the passivation cloth 20, and the thickness of the passivation cloth 20 along the central axis 11. For example, the passivation time may be increased or decreased, or the grinding wheel speed may be increased or decreased, or the passivation time may be increased and the grinding wheel speed may be decreased. This application embodiment does not specifically limit this.

[0058] In this embodiment, when the processing mechanism 100 passivates the cutting edge 201 of the tool 200 according to the passivation parameters, the passivation cloth 20 and the flank face 202 of the tool 200 are configured to be in parallel contact. Thus, by limiting the passivation cloth 20 and the flank face 202 of the tool 200 to be in parallel contact, that is, the flank face 202 of the tool 200 is parallel to the passivation cloth 20 for passivation, when the fibers 21 of the passivation cloth 20 are compressed, the fibers 21 deform and twist under pressure. The molecular chains of the twisted fibers 21 straighten under tension but are not completely straightened, thereby generating a confining pressure rebound force. The confining pressure rebound force generated by the fibers 21 acts uniformly on the cutting edge 201 of the tool 200 and forms a large uniform elastic confining pressure force on the cutting edge 201 of the tool 200, ensuring that the crystals on the surface of the cutting edge 201 of the tool 200 can be stably and plastically removed. Understandably, the confining pressure rebound force generated by the fibers 21 of the passivation cloth 20 can be understood as an elastic load. The confining pressure of the elastic load is superimposed on the cutting edge 201 of the tool 200, so that the material of the cutting edge 201 of the tool 200 is removed in a micro-chip paradigm, rather than being removed rapidly in large quantities. This method of removing the surface crystals of the cutting edge 201 of the tool 200 in a micro-chip paradigm ensures the morphology and quality of the micro-cutting edge 201 of the brittle diamond material, and ensures that the passivation of the cutting edge 201 of the tool 200 is precise and effective.

[0059] When the aforementioned machining mechanism 100 grinds and passivates the cutting edge 201 of the tool 200, passivation parameters are generated based on the parameters of the cutting edge 201 of the tool 200 to be processed and the passivation model. The passivation cloth 20 and grinding disc 10 are appropriately assembled and adjusted according to the passivation parameters. The tool 200 is connected to the connecting part 32 of the cantilever 30, and the cutting edge 201 of the tool 200 is first brought into contact with the outer ring area 13 of the grinding disc 10. The external spindle drives the grinding disc 10 to rotate. The rotation of the grinding disc 10 causes the outer ring area 13 to grind the cutting edge 201 of the tool 200, thereby grinding the cutting edge 201 of the tool 200. After grinding the cutting edge 201 of the tool 200, the cantilever 30... The machining mechanism 100 moves the cutting tool 200 away from the grinding disc 10 along a direction parallel to the central axis 11. The distance the cantilever 30 moves the cutting tool 200 is equal to the thickness of the passivation cloth 20 along the central axis 11. Simultaneously, the external spindle drives the grinding disc 10 to translate as a whole, causing the cutting edge 201 of the cutting tool 200 to contact the passivation cloth 20 on the grinding disc 10. The external spindle drives the grinding disc 10 to rotate at a speed specified by the passivation parameters, thereby passivating the cutting edge 201 of the cutting tool 200 with the passivation cloth 20. After the grinding disc 10 has rotated for the passivation time specified by the passivation parameters, the external spindle stops driving the grinding disc 10 to rotate, thus achieving passivation of the cutting edge 201 of the cutting tool 200. In essence, the machining mechanism 100 integrates the grinding and passivation of the cutting edge 201 of the cutting tool 200. Using the machining mechanism 100 provided in this application embodiment, an experimental comparison was conducted on the cutting products before and after the cutting edge 201 of the tool 200 was passivated. The surface roughness of the machined products was detected by a 3D profiler. The results showed that the average surface roughness Ra of the cutting product of the tool 200 before passivation was 0.972 μm, and the average surface roughness Ra of the cutting product of the tool 200 after passivation was 0.196 μm. Furthermore, the cutting product of the tool 200 after passivation showed no abnormal phenomena such as horizontal lines or white spots.

[0060] In this embodiment, after the processing mechanism 100 passivates the cutting edge 201 of the tool 200 according to the passivation parameters, if the passivation result does not meet the passivation requirements, the passivation parameters are reduced by a preset ratio, and the cutting edge 201 of the tool 200 is passivated again according to the passivation parameters after the preset ratio is reduced. Here, "the passivation result does not meet the passivation requirements" can be understood as insufficient passivation of the cutting edge 201 of the tool 200. For example, if the passivation result does not meet the passivation requirements, the passivation time in the passivation parameters is reduced by a preset ratio of 1 / 2. For example, if the passivation time is 70s, after reducing the preset ratio by 1 / 2 it becomes 35s, and the cutting edge 201 of the tool 200 is passivated again according to the passivation parameters after the preset ratio is reduced, which is 35s. Alternatively, if the passivation result does not meet the passivation requirements, the passivation time in the passivation parameters is reduced by a preset ratio of 5 / 7. For example, if the passivation time is 70s, reducing it by 5 / 7 results in 20s. The cutting edge 201 of the tool 200 is then passivated again for 30s based on the reduced passivation parameters. Alternatively, if the passivation result does not meet the passivation requirements, the grinding wheel speed in the passivation parameters is reduced by a preset ratio of 1 / 2. For example, if the grinding wheel speed is 800rpm, reducing it by 1 / 2 results in 400rpm. The cutting edge 201 of the tool 200 is then passivated again based on the reduced grinding wheel speed of 400rpm. Alternatively, if the passivation result does not meet the passivation requirements, the grinding wheel speed in the passivation parameters is reduced by a preset ratio of 1 / 2, and the passivation time in the passivation parameters is reduced by a preset ratio of 1 / 2. For example, if the grinding wheel speed is 800 rpm, it becomes 400 rpm after being reduced by a preset ratio of 1 / 2, and the passivation time is 70 s, it becomes 35 s after being reduced by a preset ratio of 1 / 2. Then, based on the grinding wheel speed after the preset ratio reduction, which is 400 rpm, and based on the passivation parameters after the preset ratio reduction, which is 35 s, the cutting edge 201 of the tool 200 is passivated again. Understandably, in practical applications, the preset ratio is preferably greater than or equal to 1 / 2. That is, when the cutting edge 201 of the tool 200 is passivated for the second time according to the passivation parameter after reducing the preset ratio, a relatively small passivation parameter can be used to passivate the cutting edge 201 of the tool 200 to reduce the probability of the tool 200 being scrapped. In other words, if the passivation requirement is still not met after the second passivation, an even smaller passivation parameter can be used to passivate the cutting edge 201 of the tool 200 to increase the chance of the tool 200 being repairable. The specific setting can be adaptively set according to the actual passivation requirements.

[0061] Understandably, if the passivation result of the cutting edge 201 of the tool 200 exceeds the passivation requirement, the cutting edge 201 of the tool 200 cannot be repaired using the processing mechanism 100 of this application embodiment, and needs to be reworked using other equipment or mechanisms.

[0062] In this embodiment, when the processing mechanism 100 passivates the cutting edge 201 of the tool 200 according to the passivation parameters, it sprays or coats abrasive 300 onto the passivation cloth 20. For example, when the processing mechanism 100 passivates the cutting edge 201 of the tool 200 according to the passivation parameters, it sprays a polishing liquid containing diamond abrasive 300 onto the passivation cloth 20. The particle size of the abrasive 300 can be 0.25μm, 0.5μm, 0.75μm, 1μm, 1.25μm, 1.5μm, 1.75μm, 2μm, 2.25μm, 2.5μm, 2.75μm, 3μm, etc., preferably 0.25μm. Thus, by spraying a polishing liquid containing diamond abrasive 300 onto the passivation cloth 20, a grinding action can be generated between the passivation cloth 20 and the cutting edge 201 of the tool 200, thereby passivating the cutting edge 201 of the tool 200. Understandably, in other embodiments, diamond polishing liquid may also be uniformly applied to the passivation cloth 20.

[0063] In this embodiment, when the passivation time is less than the critical time value, the passivation model satisfies the following condition (1):

[0064]

[0065] Where R is the radius of the cutting edge 201 of the tool 200 (μm), t is the passivation time (s), P is the contact pressure between the cutting edge 201 of the tool 200 and the passivation cloth 20 (kgf), L is the length of the cutting edge 201 of the tool 200 (mm), W is the contact width between the cutting edge 201 of the tool 200 and the passivation cloth 20 (mm), d is the diameter of the grinding disc (mm), n is the grinding disc rotation speed (rpm), h is the thickness of the passivation cloth 20 along the central axis 11 (mm), and E is the elastic modulus of the passivation cloth 20 (n / mm). 2 ), where α is the wedge angle (°) of the tool 200. When the passivation time is less than the critical time value, the increase or decrease of the passivation time can have a significant impact on the passivation result of the cutting edge 201 of the tool 200. When the passivation time is greater than or equal to the critical time value, the increase or decrease of the passivation time has little or negligible impact on the passivation result of the cutting edge 201 of the tool 200.

[0066] Understandably, in practical applications of the passivation model, multiple passivation times are usually selected based on experience. The conditional expression (1) is then used multiple times to calculate the passivation time. After multiple calculations, a satisfactory result is selected as the actual passivation time. Thus, through the aforementioned conditional expression (1), the passivation parameters can be derived based on the parameters of the cutting edge 201 of the tool 200 to be processed and the conditional expression (1). In this embodiment, the elastic modulus E of the triclinic polyester velvet fabric can be 1930 N / mm². 2The passivation time t can range from 40s to the critical time value; the contact pressure P between the cutting edge 201 of the tool 200 and the passivation cloth 20 can range from 0.1kgf to 0.5kgf; the length L of the cutting edge 201 of the tool 200 can range from 2.5mm to 3.5mm; the contact width W between the cutting edge 201 of the tool 200 and the passivation cloth 20 can range from 0.02mm to 0.2mm; the grinding wheel speed n can range from 100rpm to 1500rpm; and the thickness h of the passivation cloth 20 along the central axis 11 can range from 1mm to 1.5mm.

[0067] In this embodiment, when the passivation time is greater than or equal to the critical time value, the passivation model also satisfies the following condition (2):

[0068]

[0069] Thus, when the passivation time is greater than or equal to the critical time value, the passivation radius R of the cutting edge 201 of the tool 200 is very small. In other words, if you want to obtain a larger cutting edge 201 radius R of the tool 200, increasing the passivation time has a small or negligible effect. At this time, at least one of the passivation parameters P and h can be obtained through the conditional equation (2), thereby improving the versatility of the passivation model.

[0070] Understandably, the radius R of the cutting edge 201 of the tool 200 calculated by condition (1) and condition (2) can both have errors, with the error range being, for example, -0.5μm to 0.5μm. If the error between the calculated radius R of the cutting edge 201 of the tool 200 and the actual required radius R of the cutting edge 201 of the tool 200 is within the above range, then the above-mentioned passivation parameters can be used to passivate the cutting edge 201 of the tool 200.

[0071] For example, taking a target value of 2.1 μm for the radius R of the cutting edge 201 of the tool 200, a length L of 3.0 mm for the cutting edge 201 of the tool 200, and a contact width W of 0.1 mm between the cutting edge 201 of the tool 200 and the passivation cloth 20, based on experience or experiments, the thickness h of the passivation cloth 20 along the central axis 11 is pre-selected as 1.2 mm. The following intermediate-level parameters are preferentially selected: passivation time t is 70 s, contact pressure P between the cutting edge 201 of the tool 200 and the passivation cloth 20 is 0.35 kgf, grinding disc speed n is 800 rpm, and the elastic modulus of the passivation cloth 20 is 1930 N / mm². 2The diameter of the grinding disc 10 can be 310 mm, and the diameter of the passivation cloth 20 can be 210 mm. Substituting the above data into conditional equation (1), the radius R of the cutting edge 201 of the tool 200 is found to be 1.8 μm. Compared with the target value of 2.1 μm, the error is 0.3 μm, which meets the error requirement. This indicates that the above parameters can be used to actually passivate the cutting edge 201 of the tool 200. It is understandable that if the passivation requirement is more precise, other parameters can be experimented with to reduce the error. This will not be elaborated on in the embodiments of this application.

[0072] In this embodiment, factors affecting the radius R of the cutting edge 201 of the tool 200 are identified based on orthogonal experiments and analysis, and a passivation model is derived by combining the stress-strain yielding mechanism. Based on stress and strain, relevant factors are screened. First, optimal condition parameters are selected based on experiments. Then, using the actual application scenario conditions, an orthogonal experiment is designed with 4 factors and 3 levels. The orthogonal experiment is designed with 4 factors and 3 levels: the thickness h of the passivation cloth 20 along the central axis 11, the contact pressure P between the cutting edge 201 of the tool 200 and the passivation cloth 20, the passivation time t, and the grinding wheel rotation speed n. Please refer to Table 1 below.

[0073] Table 1

[0074] level h(mm) P(kgf) t(s) n(rpm) R(μm) 1 1.0 0.2 40 600 1.3 2 1.0 0.35 70 800 1.8 3 1.0 0.5 100 1000 2.7 4 1.2 0.2 70 1000 2.0 5 1.2 0.35 100 600 2.3 6 1.2 0.5 40 800 1.7 7 1.4 0.2 100 800 1.8 8 1.4 0.35 40 1000 1.6 9 1.4 0.5 70 600 1.7 Mean 1 1.903 1.673 1.506 1.732 Mean 2 1.970 1.883 1.809 1.732 Mean 3 1.677 1.993 2.235 2.086 Range Z 0.293 0.320 0.729 0.354

[0075] From the range Z factor in Table 1, we can conclude that 0.729 > 0.354 > 0.320 > 0.293. Analyzing the experimental results based on the meaning of the range Z, the passivation results change significantly when the passivation time changes. In other words, the passivation times in Table 1 are all less than the critical time value, indicating that the passivation time has the greatest impact, followed by the grinding disc speed, while the thickness of the passivation cloth 20 along the central axis 11 has the least impact. This means that when passivating the cutting edge 201 of tools 200 of different specifications, the passivation time can be adjusted preferentially within the critical time value, thereby saving the adjustment time and number of passivation parameters.

[0076] In order to control and reduce data errors, error analysis experiments were conducted using four factors and five levels: the thickness h of the passivation cloth 20 along the central axis 11, the contact pressure P between the cutting edge 201 of the tool 200 and the passivation cloth 20, the passivation time t, and the grinding wheel speed n. Please refer to Table 2 below, where the calculated value is the radius of the cutting edge 201 of the tool 200 obtained according to the conditional formula (1).

[0077] Table 2

[0078]

[0079] As shown in Table 2, the maximum error is 0.3 μm, which is within the allowable error range.

[0080] Based on Table 1, it can be seen that the passivation time has the greatest impact on the passivation result of the cutting edge 201 of the tool 200. The experiment was conducted with four factors and five levels: the thickness h of the passivation cloth 20 along the central axis 11, the contact pressure P between the cutting edge 201 of the tool 200 and the passivation cloth 20, the passivation time t, and the grinding wheel speed n. Please refer to Table 3 below.

[0081] Table 3

[0082]

[0083] As shown in Table 3, when the passivation time exceeds 110 s, the radius R of the cutting edge 201 of the tool 200 no longer increases linearly, but stabilizes around 2.7 μm. Therefore, 110 s can be considered a critical time value. Understandably, in other embodiments, other critical time values ​​can be verified depending on the cutting edge 201 of the tool 200. Understandably, the passivation cloth 20 is a flexible fleece with a certain thickness. The elastic deformation reaction force of the passivation cloth 20 has a certain range; beyond this range, the deformation force cannot be increased. Therefore, outside the deformation range of the passivation cloth 20 under pressure, the cutting edge 201 of the tool 200 only changes in shape, without changing its radius.

[0084] Through repeated experimental analysis, it can be seen that the thicker the passivation cloth 20 and the higher the grinding wheel speed, the more difficult it is to control the edge 201 defect of the tool 200. Preferably, a lower grinding wheel speed and a medium-thickness passivation cloth 20 are preferred. Accordingly, when generating passivation parameters using the passivation model, a lower grinding wheel speed and a medium-thickness passivation cloth 20 can be selected. Multiple passivation times can be selected and calculated using conditional formula (1) to facilitate the selection of the actual passivation time. In other words, the passivation time can be preferentially adjusted within the critical time value, thereby saving the adjustment time and number of passivation parameters.

[0085] Understandably, in other embodiments, the processing mechanism 100 may also include a pressure sensor (not shown), disposed between the connection portion 32 of the cantilever 30 and the cutting tool 200. The pressure sensor detects the pressure between the cutting tool 200 and the outer ring region 13 of the grinding disc 10 or the passivation cloth 20. Thus, by providing the aforementioned pressure sensor, the pressure between the cutting tool 200 and the outer ring region 13 or the passivation cloth 20 can be detected. Understandably, based on the pressure value detected by the pressure sensor, the external spindle can also drive the grinding disc 10 and the passivation cloth 20 to move closer to or further away from the cantilever 30, thereby increasing or decreasing the pressure between the cutting tool 200 and the outer ring region 13 or the passivation cloth 20, thereby adjusting the pressure between the cutting tool 200 and the outer ring region 13 or the passivation cloth 20 in real time, which is beneficial for ensuring the grinding and passivation yield.

[0086] The processing mechanism 100 of this embodiment has a simple structure. It grinds and passivates the cutting edge 201 of the tool 200 using the outer ring region 13 and the passivation cloth 20, respectively. This achieves an integrated solution where the outer ring region 13 grinds the cutting edge 201 of the tool 200, and the inner ring region 12, in conjunction with the passivation cloth 20, passesivates the cutting edge 201 of the tool 200. The operation is simple and accurate. The passivation cloth 20, being elastic, passesivates the cutting edge 201 of the tool 200. The passivation cloth 20 uniformly surrounds and presses the cutting edge 201 of the tool 200 with elastic stress, and the elastic load of the passivation cloth 20 surrounds... The pressure superposition effect is applied to the cutting edge 201 of the tool 200, causing the material of the cutting edge 201 of the tool 200 to be removed in a micro-chip paradigm. This ensures the morphology and quality of the microscopic cutting edge 201 of the brittle diamond material tool 200, guaranteeing precise and effective passivation. This results in good consistency of the cutting edge 201 of the tool 200, good cutting surface quality, and reduced chipping, lowering production technical difficulty and manufacturing costs. Furthermore, the high grinding and passivation efficiency of the machining mechanism 100 and the short passivation time reduce the probability of tool 200 scrap, increase the opportunity for tool 200 repair, and lower production costs. In addition, by generating passivation parameters through the passivation model, the passivation parameters can be reasonably, accurately, and quickly adjusted according to the parameters of the cutting edge 201 of the tool 200 to be machined, reducing adjustment time and frequency, and improving machining efficiency.

[0087] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A machining mechanism for grinding and blunting the cutting edge of a tool, characterized in that, include: A grinding disc having a central axis, the grinding disc rotating about the central axis, the grinding disc including an inner ring region surrounding the central axis and an outer ring region surrounding and connected to the inner ring region, the outer ring region grinding the cutting edge of a tool; A passivating cloth is disposed in the inner ring area and rotates synchronously with the grinding disc. The passivating cloth is elastic and configured to passivate the cutting edge of the tool. A cantilever is disposed opposite to the grinding disc and moves closer to or further away from the grinding disc in a direction parallel to the central axis; the cantilever connects to the cutting tool. The processing mechanism is configured to generate passivation parameters based on a passivation model and passivate the cutting edge of the tool based on the passivation parameters. The passivation parameters include at least one of passivation time, grinding disc rotation speed, contact pressure between the cutting edge of the tool and the passivation cloth, and the thickness of the passivation cloth along the central axis. When the passivation time is less than the critical time value, the passivation model satisfies the following condition: ； When the passivation time is greater than or equal to the critical time value, the passivation model satisfies the following condition: ； Where R is the cutting edge radius of the tool, t is the passivation time, P is the contact pressure between the cutting edge of the tool and the passivation cloth, L is the cutting edge length of the tool, W is the width of the contact between the cutting edge of the tool and the passivation cloth, d is the diameter of the grinding disc, n is the grinding disc rotation speed, h is the thickness of the passivation cloth along the central axis, E is the elastic modulus of the passivation cloth, and α is the tool wedge angle.

2. The processing mechanism as described in claim 1, characterized in that, After the processing mechanism passivates the cutting edge of the tool according to the passivation parameters, if the passivation result does not meet the passivation requirements, the passivation parameters are reduced by a preset ratio, and the cutting edge of the tool is passivated according to the passivation parameters after the preset ratio is reduced.

3. The processing mechanism as described in claim 1, characterized in that, When the processing mechanism passivates the cutting edge of the tool according to the passivation parameters, it sprays or applies abrasive to the passivation cloth.

4. The processing mechanism as described in claim 1, characterized in that, When the processing mechanism passivates the cutting edge of the tool according to the passivation parameters, the passivation cloth and the back face of the tool are configured to make parallel contact.

5. The processing mechanism as described in claim 1, characterized in that, The passivation cloth is a triclinic polyester velvet cloth.

6. The processing mechanism as described in claim 1, characterized in that, The passivation fabric comprises a plurality of densely distributed fibers, each fiber having a diameter ranging from 1 μm to 3 μm and a length along the central axis ranging from 1 mm to 1.5 mm.

7. The processing mechanism as described in claim 1, characterized in that, The machining mechanism also includes a pressure sensor disposed between the cantilever and the cutting tool, which detects the pressure between the cutting tool and the outer ring area or the passivation cloth.

8. The processing mechanism as described in claim 1, characterized in that, The processing mechanism further includes a support platform and a spiral pad. The support platform is spaced apart from the grinding disc, and the spiral pad is disposed on the support platform and connected to the cantilever. The spiral pad is spaced apart from the cutting tool on the cantilever.

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