Monocrystal diamond special-shaped cutter and preparation method

Abstract

This invention belongs to the field of diamond cutting tool technology, and provides a single-crystal diamond irregular-shaped cutting tool and its preparation method. The tool shank is made of GK05A cemented carbide with a Co content of 5-7% by mass. One end is formed into a pointed end, which transitions linearly to the tool shank body with an arc. A notch and a chip removal groove are machined on one side of the pointed end. The side of the chip removal groove is an R40mm arc surface, and the bottom of the groove forms a first mounting surface. The tool body has an irregular shape structure, and its bottom surface fits snugly against the first mounting surface. After installation, the center height is 3.05-3.1mm. The tool tip is inclined, and the bottom edge angle between the first and second cutting faces is 0.5-1.5 degrees. Alternating first and second protrusions are formed on the tool body. The first protrusion is closer to the tool tip, and the second protrusion is farther from the tool tip. The maximum diameter of the second protrusion is larger than that of the first protrusion. This invention uses a GK05A cemented carbide tool shank to reduce the probability of diamond breakage to less than 1%. A single tool can complete multiple feature machining, improving machining efficiency and reliability.

Description

Technical Field

[0001] This invention belongs to the field of diamond cutting tool technology, and particularly relates to a single crystal diamond special-shaped cutting tool and its preparation method, which is mainly used for the forming and processing of precision metal parts. Background Technology

[0002] With the continuous development of industrial manufacturing, the requirements for machining accuracy and surface quality of metal parts are increasing. In the field of precision machining, single-crystal diamond tools are widely used in the ultra-precision machining of non-ferrous metals, precision optical components, and high-gloss surfaces due to their extremely high hardness and excellent wear resistance.

[0003] Currently, in the machining of complex and irregularly shaped parts, traditional machining methods often require the simultaneous or step-by-step use of multiple single-crystal forming tools to meet the forming requirements of different parts and features. However, this multi-tool machining method has significant technical drawbacks: on the one hand, the simultaneous use of multiple single-crystal forming tools leads to a substantial increase in tool costs, and the continuous rise in the price of cemented carbide tool holders further exacerbates cost pressures; on the other hand, the tool changing, tool setting, and collaborative machining processes significantly reduce machining efficiency and increase machining time.

[0004] Furthermore, existing single-crystal diamond cutting tools have numerous shortcomings in their structural design. The selection of tool holder materials often fails to adequately consider the special requirements of single-crystal diamond welding and use, leading to a tendency for the diamond tool body to fracture during machining and a low yield. Simultaneously, the design of the tool body and tool holder mounting structure is inadequate, affecting the overall rigidity of the tool and machining accuracy. The chip removal structure design is also not sufficiently optimized, impacting chip removal efficiency and surface finish during cutting.

[0005] Therefore, developing a single-crystal diamond machining tool that can complete the machining of complex irregular parts with a single tool and has high stability and high machining accuracy is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a single-crystal diamond profiled tool, comprising: The tool holder is made of GK05A cemented carbide with a Co content of 5-7% by mass. One end of the tool holder is formed into a pointed end. The pointed end is linearly transitioned to the tool holder body by an arc. A notch and a chip removal groove are machined on one side of the pointed end. The chip removal groove is set along one side of the notch. One side of the chip removal groove is an arc surface with a radius R of 40mm, and the bottom of the chip removal groove forms a first mounting surface. The blade body has an irregular shape, and its bottom surface is fitted to the first mounting surface. The center height H1 of the blade body after installation is 3.05-3.1mm. The blade body has a blade tip, which is inclined on the blade body. The blade tip has a first cutting surface and a second cutting surface, and the bottom edge deflection angle ∠C between the first cutting surface and the second cutting surface is 0.5-1.5 degrees. The blade body has alternating first protrusions and second protrusions. The first protrusions are located close to the blade tip, and the second protrusions are located away from the blade tip. The maximum diameter of the second protrusion is greater than the maximum diameter of the first protrusion.

[0007] Furthermore, the groove depth H2 of the notch is 2.9±0.02mm, and the groove depth H3 of the first mounting surface is 2.5±0.02mm.

[0008] Furthermore, the raw material used to manufacture the blade body has dimensions of 5.5mm in length, 4.0mm in width, and 0.7mm in thickness.

[0009] Furthermore, the center height of the pressure surface after welding the blade body is 3.15±0.05mm.

[0010] Furthermore, the blade body is formed into sheet material using a laser cutting machine.

[0011] Furthermore, the blade body is welded using copper-based solder.

[0012] Furthermore, the maximum diameter D1 of the first convex rotating surface is 5.81±0.03mm, and the maximum diameter D2 of the second convex rotating surface is 8±0.03mm.

[0013] Furthermore, the distance H4 between the maximum diameter surface of the first protrusion and the top of the blade tip is 1.73 ± 0.03 mm.

[0014] Furthermore, the tool holder is made of GK05A cemented carbide with a Co content of 6% by mass.

[0015] This invention also provides a method for preparing a single-crystal diamond profiled tool, comprising: GK05A cemented carbide bar with a Co content of 5-7% by mass is selected as the raw material for the tool holder. The bar is processed into the required tool holder shape, with one end being machined into a pointed end. The pointed end and the tool holder body are connected by a circular arc linear transition. A notch and a chip removal groove are machined on one side of the pointed end. The notch depth H2 is 2.9±0.02mm, and the shearing angle is controlled at 0-0.2°. The groove depth H3 of the first mounting surface is controlled at 2.5±0.02mm. One side of the chip removal groove is machined into an arc surface with an arc radius R of 40mm. The single-crystal diamond raw material is cut into sheets, with the length × width dimensions of the sheets controlled to be 5.5mm × 4.0mm and the thickness to be 0.7mm; The cut single-crystal diamond sheet is placed in the notch groove as the blade, so that the bottom surface of the blade is in contact with the first mounting surface; Copper-based solder was used for welding, so that the center height of the pressure surface of the control tool body was 3.15±0.05mm after welding.

[0016] Furthermore, the preparation method of single-crystal diamond special-shaped cutting tools also includes: performing surface finishing on the welded cutting tool, and controlling the center height H1 of the cutting tool body after surface finishing to be 3.05-3.1mm.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The single-crystal diamond profile cutting tool provided by this invention uses GK05A cemented carbide with a Co content of 5-7% by mass to manufacture the tool holder. Utilizing its fine-grained structure and low cobalt ratio, the tool holder possesses excellent resistance to abrasive wear and erosion wear, while also withstanding moderate impacts, being less prone to chipping and cracking, and exhibiting strong corrosion resistance. Actual testing has verified that using this tool holder material reduces the probability of diamond breakage during machining to less than 1%, while the breakage probability using other grades of tool holder materials is between 30% and 70%, significantly improving tool life and machining reliability.

[0018] 2. This invention effectively reduces stress concentration and improves the structural strength of the tool holder by using a structural design where the tip of the tool holder transitions linearly to the main body in an arc. Simultaneously, a notch and chip removal groove are provided at the tip, with the chip removal groove featuring a 40mm radius arc surface design on its side, optimizing the chip removal path and preventing chip accumulation from affecting the surface finish.

[0019] 3. By setting the tool body to an irregular shape and forming alternating first and second protrusions on the tool body, and the maximum diameter of the second protrusion is greater than the maximum diameter of the first protrusion, the present invention enables a single tool to complete the multi-feature machining of complex irregular parts without the need to change tools, which significantly improves machining efficiency and reduces machining costs.

[0020] 4. By setting the cutting tip to an inclined structure and controlling the bottom edge angle ∠C between the first and second cutting surfaces to be 0.5-1.5 degrees, the present invention enables the cutting tip to have good cutting performance during the cutting process, reduces cutting resistance, and improves the surface finish of the machined surface.

[0021] 5. This invention precisely controls the center height H1 of the blade body after installation to 3.05-3.1mm, ensuring sufficient cutting edge extension without causing interference during use. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the first three-dimensional structure of the single-crystal diamond profiled tool of the present invention; Figure 2 This is a schematic diagram of the second three-dimensional structure of the single-crystal diamond profiled tool of the present invention; Figure 3 This is a rear view schematic diagram of the single-crystal diamond profiled tool of the present invention; Figure 4 This is a front view schematic diagram of the single-crystal diamond profiled tool of the present invention; Figure 5 This is a schematic diagram of the right-side structure of the single-crystal diamond profiled tool of the present invention; Figure 6 for Figure 5 A magnified structural diagram of part A in the middle; Figure 7 This is a schematic diagram of the left-side structure of the single-crystal diamond profiled tool of the present invention; Figure 8 for Figure 7 A magnified structural diagram of part B in the middle; Figure 9 This is a schematic diagram of the three-dimensional structure of the tool holder; Figure 10 This is a schematic diagram of the three-dimensional structure of the blade.

[0023] Illustration: 10. Tool holder; 101. Tipped end; 102. Notch; 103. Chip removal groove; 104. First mounting surface; 20. Tool body; 201. Tool tip; 202. First cutting face; 203. Second cutting face; 204. First protrusion; 205. Second protrusion. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] Example like Figures 1 to 10As shown, an embodiment of the present invention provides a single-crystal diamond profiled tool, including a tool holder 10 and a tool body 20.

[0026] The tool holder 10 is made of GK05A cemented carbide with a Co content of 5-7% by mass, preferably 6%. GK05A cemented carbide belongs to the category of fine-grained cemented carbide, with its grain size controlled within the fine-grained range. In this material, cobalt (Co) acts as a binder phase, and its mass fraction is controlled within the low range of 5-7%. The low cobalt ratio results in a tighter bond between the tungsten carbide (WC) hard phase particles, thereby improving the alloy's hardness and wear resistance. At the same time, the fine-grained structure gives the alloy higher bending strength and fracture toughness. Through extensive experimental verification by the applicant, tool holders made of GK05A cemented carbide with this specific ratio and structure have shown significantly better stability than other grades of cemented carbide in the machining of single-crystal diamond tools. Specifically, under the same processing conditions, the probability of diamond breakage during processing can be controlled to less than 1% for single-crystal forming tools using the GK05A cemented carbide tool holder of this invention; while the probability of diamond breakage for single-crystal forming tools using other conventional grades of cemented carbide (such as YG6, YG8, etc.) is between 30% and 70%. This significant difference is mainly attributed to the synergistic effect of the fine-grained structure and low cobalt ratio of GK05A cemented carbide—the fine-grained structure provides excellent impact resistance, while the low cobalt ratio ensures sufficiently high hardness and wear resistance. The combined effect allows the tool holder to effectively buffer and absorb vibration while bearing cutting forces, thereby protecting the brittle single-crystal diamond tool body from breakage.

[0027] One end of the tool holder 10 is formed into a pointed end 101, which transitions linearly to the main body of the tool holder 10 with an arc. This linear transition design avoids stress concentration at the connection between the pointed end and the main body, improving the structural reliability of the tool holder under stress. A notch 102 and a chip removal groove 103 are machined on one side of the pointed end 101, with the chip removal groove 103 positioned along one side of the notch 102. The notch 102 facilitates the pressing and cutting of the cutting edge, while the chip removal groove 103 guides the smooth discharge of chips during cutting, preventing chip accumulation in the cutting area from affecting machining quality and tool life. One side of the chip removal groove 103 is an arc surface with a radius R of 40 mm. This specific radius arc surface design is optimized to ensure sufficient chip removal space without weakening the structural strength of the pointed end of the tool holder. The bottom of the chip removal groove 103 is formed as a first mounting surface 104, which is used to fit against the bottom surface of the cutter body 20 to provide a precise positioning reference for the cutter body.

[0028] The cutter body 20 has an irregular shape, meaning its outline is not a regular geometric shape but a complex shape specifically designed according to the contour characteristics of the irregular part to be machined. The bottom surface of the cutter body 20 is fitted to the first mounting surface 104 and fixedly connected by welding. The center height H1 of the cutter body 20 after installation is 3.05-3.1mm. This center height refers to the distance between the front surface of the cutter body 20 and the radial surface of the cutter shank 10 after welding and fixing. Controlling the center height H1 within the range of 3.05-3.1mm ensures that the cutter body 20 fully extends its cutting edge (i.e., the cutting edge of the cutter body 20 is higher than the bottom of the notch groove 102), preventing interference during use and facilitating subsequent surface finishing without regrinding the cutting edge.

[0029] The tool body 20 has a cutting tip 201, which is inclined on the tool body 20. The inclined arrangement of the cutting tip 201 allows the tool to cut at a more advantageous angle when entering the workpiece, reducing cutting resistance. The cutting tip 201 has a first cutting face 202 and a second cutting face 203, with a bottom edge angle ∠C of 0.5-1.5 degrees between the first cutting face 202 and the second cutting face 203. The bottom edge angle ∠C refers to the angle formed by the first cutting face 202 and the second cutting face 203 at the bottom edge; the size of this angle directly affects the sharpness of the cutting edge and the cutting strength. Controlling the bottom edge angle within a small range of 0.5-1.5 degrees ensures that the cutting tip 201 maintains good sharpness while possessing sufficient cutting strength, which is beneficial for obtaining a high-gloss machined surface.

[0030] The tool body 20 has alternating first protrusions 204 and second protrusions 205. The first protrusions 204 are located near the tool tip 201 and have a semi-circular transition; the second protrusions 205 are located away from the tool tip 201 and have a rectangular structure. The maximum diameter of the second protrusion 205 is greater than the maximum diameter of the first protrusion 204. The alternating arrangement of the first and second protrusions 204 and the differentiated diameter design allow the overall contour of the tool body 20 to match the multi-feature forming requirements of irregularly shaped parts. During the cutting process, the tool tip 201 mainly completes the cutting of the main forming surfaces, while the first and second protrusions 204 and 205 respectively correspond to the feature parts of different positions and sizes on the workpiece, thereby achieving the goal of completing multi-feature machining with a single tool.

[0031] As a further optimization of the present invention, the groove depth H2 of the notch 102 is 2.9±0.02mm, and the groove depth H3 of the first mounting surface 104 is 2.5±0.02mm. The groove depth H2 of the notch 102 refers to the thickness of the bottom of the notch 102 relative to the radial surface of the tool holder 10, and the groove depth H3 of the first mounting surface 104 refers to the thickness of the first mounting surface 104 relative to the radial surface of the tool holder 10. By controlling H2 within the precision range of 2.9±0.02mm and H3 within the precision range of 2.5±0.02mm, sufficient accommodating space and installation depth for the tool body 20 are ensured, while sufficient tool holder base structure is retained to maintain the structural strength of the pointed end 101, thereby improving the strength of the tool holder and reducing the risk of tool breakage during use. The notch 102 is used for preliminary positioning of the tool body 20 before welding, while the first mounting surface 104 provides the final precise installation reference.

[0032] The raw material for manufacturing the blade body 20 is monocrystalline diamond (MCD) sheet, with dimensions of 5.5mm (length) × 4.0mm (width) × 0.7mm (thickness). This diamond size is designed to achieve optimal cost while ensuring weld strength and machining allowance. The blade body 20 is formed using a laser cutting machine, which cuts the monocrystalline diamond raw material into the required sheet shape using laser cutting technology. Laser cutting offers advantages such as high cutting precision, a small heat-affected zone, and straight, chip-free cuts, ensuring the straightness and integrity of the diamond cutting edge and avoiding diamond chipping and edge defects that may occur with traditional mechanical cutting. The cut sheet has dimensions of 5.5mm × 4.0mm and a thickness of 0.7mm. This size is optimized to provide sufficient material for forming irregularly shaped structures while avoiding material waste.

[0033] The center height of the pressure surface after welding the tool body 20 is 3.15±0.05mm. The center height of the pressure surface refers to the distance between the front surface of the tool body 20 and the radial surface of the tool shank 10 after welding. Controlling the center height of the pressure surface within the accuracy range of 3.15±0.05mm ensures that in subsequent finishing processes, the final center height H1 (3.05-3.1mm) can be achieved by removing a small amount of material, and also facilitates the pressure surface operation. Pressure surface operation allows for better control of the cutting edge quality and machining efficiency, achieving 70% higher efficiency than direct grinding. Controlling the center height H1 to 3.05-3.1mm allows for tool rework via pressure surface operation without the need for regrinding the cutting edge.

[0034] The cutter body 20 is welded using copper-based solder. Copper-based solder has good wettability and fluidity, enabling it to fully fill the minute gaps between the bottom surface of the cutter body 20 and the first mounting surface 104 at welding temperatures, forming a uniform and dense weld. Simultaneously, the coefficient of thermal expansion of copper-based solder is well-matched with both cemented carbide and single-crystal diamond, effectively reducing cutter body deformation and weld cracks caused by thermal stress during welding cooling. During the welding process, by applying multiple coats of copper-based solder and controlling the welding temperature and time, weld strength and weld quality are ensured, avoiding the impact of weld defects and air bubbles on weld strength.

[0035] The maximum diameter D1 of the rotating surface of the first protrusion 204 is 5.81 ± 0.03 mm, and the maximum diameter D2 of the rotating surface of the second protrusion 205 is 8 ± 0.03 mm. Here, the maximum diameter of the rotating surface refers to the maximum diameter of rotation formed by the first protrusion 204 and the second protrusion 205 when rotating around the central axis of the tool holder 10. Precise control of D1 and D2 ensures that the first protrusion 204 and the second protrusion 205 can accurately shape the dimensions of corresponding feature parts on the workpiece during machining. The maximum diameter D3 of the rotating surface of the tool tip 201 is 4 ± 0.03 mm. The diameter D4 of the tool holder 10 is 6 mm.

[0036] The distance H4 between the maximum diameter surface of the first protrusion 204 and the top of the cutting tip 201 is 1.73 ± 0.03 mm. This distance refers to the axial distance from the top of the cutting tip 201 to the maximum diameter surface of the first protrusion 204 (i.e., the cross-section with the largest radial dimension of the first protrusion 204). Precise control of H4 ensures the positional accuracy of the first protrusion 204 relative to the cutting tip 201, thereby guaranteeing the accurate relative positional relationship of each cutting feature part of the tool during machining.

[0037] The distance H5 between the maximum diameter surface of the second protrusion 205 and the top of the tool tip 201 is 4.3 ± 0.02 mm. This distance refers to the axial distance from the top of the tool tip 201 to the maximum diameter surface of the second protrusion 205 (i.e., the cross-section with the largest radial dimension of the second protrusion 205). Precise control of H5 ensures the positional accuracy of the second protrusion 205 relative to the tool tip 201, thereby guaranteeing the accurate relative positional relationship of each cutting feature part of the tool during machining. Tools based on these parameters can effectively prevent single-crystal diamond from cracking and extend tool life.

[0038] The present invention will be further described below in conjunction with the manufacturing method of the present invention.

[0039] The present invention discloses a method for manufacturing a single-crystal diamond profiled tool, comprising the following steps: Step 1, Tool holder preparation: Select GK05A cemented carbide bar with a Co content of 5-7% by mass as the raw material for tool holder 10. Machining the bar into the required tool holder shape, one end is machined into a pointed end 101, and the pointed end 101 is connected to the tool holder 10 body by a circular arc linear transition.

[0040] Step 2, Grooving: A CNC grinder is used to machine a notch 102 and a chip removal groove 103 on one side of the pointed end 101. First, the notch 102 is machined, controlling the groove depth H2 to be 2.9±0.02mm and the shearing angle to be 0-0.2°. Then, a surface grinder is used to machine the chip removal groove 103, controlling the groove depth H3 of the first mounting surface 104 to be 2.5±0.02mm. One side of the chip removal groove 103 is machined into an arc surface with a radius R of 40mm.

[0041] Step 3, Blade Body Sheet Preparation: The single-crystal diamond raw material is cut into sheets using a laser cutting machine. The sheet dimensions are controlled to be 5.5mm x 4.0mm (length x width) and 0.7mm (thickness). Cutting parameters are controlled during the laser cutting process to ensure a straight, chip-free cut surface.

[0042] Step four, welding: Place the cut single-crystal diamond sheet as the blade 20 into the notch 102, ensuring the bottom surface of the blade 20 is in contact with the first mounting surface 104. Use copper-based solder for welding, applying multiple coats of solder during the process, and controlling the welding temperature and time to ensure weld strength. After welding, maintain the center height of the pressure surface of the blade 20 at 3.15 ± 0.05 mm.

[0043] Step 5, Finishing: Perform finishing on the welded tool by pressing the surface, controlling the center height H1 of the tool body 20 to be 3.05-3.1mm after pressing. Simultaneously, finish the tool tip 201 to form an inclined tool tip structure, and form a first cutting face 202 and a second cutting face 203 on the tool tip 201, controlling the bottom edge angle ∠C between the first cutting face 202 and the second cutting face 203 to be 0.5-1.5 degrees. Finish the first protrusion 204 and the second protrusion 205, controlling the maximum diameter D1 of the rotating surface of the first protrusion 204 to be 5.81±0.03mm, the maximum diameter D2 of the rotating surface of the second protrusion 205 to be 8±0.03mm, the distance H4 from the maximum diameter surface of the first protrusion 204 to the top of the tool tip 201 to be 1.73±0.03mm, and the distance H5 from the maximum diameter surface of the second protrusion 205 to the top of the tool tip 201 to be 4.3±0.02mm.

[0044] By following the above steps, the single-crystal diamond profiled tool of the present invention can be obtained.

[0045] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A single-crystal diamond profiled cutting tool, characterized in that, include: The tool holder is made of GK05A cemented carbide with a Co content of 5-7% by mass. One end of the tool holder is formed into a pointed end. The pointed end is linearly transitioned to the tool holder body by an arc. A notch and a chip removal groove are machined on one side of the pointed end. The chip removal groove is set along one side of the notch. One side of the chip removal groove is an arc surface with a radius R of 40mm, and the bottom of the chip removal groove forms a first mounting surface. The blade body has an irregular shape, and its bottom surface is fitted to the first mounting surface. The center height H1 of the blade body after installation is 3.05-3.1mm. The blade body has a blade tip, which is inclined on the blade body. The blade tip has a first cutting surface and a second cutting surface, and the bottom edge deflection angle ∠C between the first cutting surface and the second cutting surface is 0.5-1.5 degrees. The blade body has alternating first protrusions and second protrusions. The first protrusions are located close to the blade tip, and the second protrusions are located away from the blade tip. The maximum diameter of the second protrusion is greater than the maximum diameter of the first protrusion.

2. The single-crystal diamond profiled tool as described in claim 1, characterized in that, The groove depth H2 of the notch is 2.9±0.02mm, and the groove depth H3 of the first mounting surface is 2.5±0.02mm.

3. The single-crystal diamond profiled tool as described in claim 1, characterized in that, The raw material used to manufacture the blade body has dimensions of 5.5mm in length, 4.0mm in width, and 0.7mm in thickness.

4. The single-crystal diamond profiled tool as described in claim 3, characterized in that, The center height of the pressure surface after welding the blade body is 3.15±0.05mm.

5. The single-crystal diamond profiled tool as described in claim 3, characterized in that, The blade is made by cutting sheet material using a laser cutting machine.

6. The single-crystal diamond profiled tool as described in claim 4, characterized in that, The blade body is welded using copper-based solder.

7. The single-crystal diamond profiled tool as described in claim 1, characterized in that, The maximum diameter D1 of the first convex rotating surface is 5.81±0.03mm, and the maximum diameter D2 of the second convex rotating surface is 8±0.03mm.

8. The single-crystal diamond profiled tool as described in claim 1, characterized in that, The distance H4 between the maximum diameter surface of the first protrusion and the top of the blade tip is 1.73 ± 0.03 mm.

9. A method for preparing a single-crystal diamond profiled cutting tool, characterized in that, include: GK05A cemented carbide bar with a Co content of 5-7% by mass is selected as the raw material for the tool holder. The bar is processed into the required tool holder shape, with one end being machined into a pointed end. The pointed end and the tool holder body are connected by a circular arc linear transition. A notch and a chip removal groove are machined on one side of the pointed end. The notch depth H2 is 2.9±0.02mm, and the shearing angle is controlled at 0-0.2°. The groove depth H3 of the first mounting surface is controlled at 2.5±0.02mm. One side of the chip removal groove is machined into an arc surface with an arc radius R of 40mm. The single-crystal diamond raw material is cut into sheets, with the length × width dimensions of the sheets controlled to be 5.5mm × 4.0mm and the thickness to be 0.7mm; The cut single-crystal diamond sheet is placed in the notch groove as the blade, so that the bottom surface of the blade is in contact with the first mounting surface; Copper-based solder was used for welding, so that the center height of the pressure surface of the control tool body was 3.15±0.05mm after welding.

10. The method for preparing a single-crystal diamond profiled tool according to claim 9, characterized in that, Also includes: After welding, the tool is subjected to surface finishing, and the center height H1 of the tool body is controlled to be 3.05-3.1mm after surface finishing.

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