A method for producing a coated tool

Abstract

The invention discloses a production method of a coated tool. Firstly, in a substrate pretreatment process A, A1 can completely remove oil stains on the surface of a tool substrate, A2 can realize corrosion of tungsten carbide grains to completely expose a binder Co, A3 can realize etching of Co elements on the surface, and A4 can form defects on the surface of the tool substrate, which are favorable positions for diamond nucleation, thereby increasing the density of diamond nucleation in the later stage, and diamond powder attached to the surface of the tool substrate can be directly used as a crystal nucleus for diamond nucleation; secondly, in a furnace loading process B, the tool substrate is fixed on a clamping mechanism, a walking mechanism drives a furnace cover to move to the bottom of a furnace body, and a lifting mechanism drives the furnace cover to move upward and then close with the furnace body, so that the tool substrate is loaded into a chemical meteorological deposition furnace, and vice versa, the diamond coated tool after coating deposition is removed, and finally the coating deposition production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tool production, and in particular to a production method of a coated tool. Background Art

[0002] Diamond coated graphite machining tools are based on cemented carbide. After pretreatment of the substrate, a 10-30pm polycrystalline diamond film is deposited on the surface of the working area of ​​the cemented carbide substrate using a gas deposition method, and the finished product is made after polishing.

[0003] For example, a Chinese patent with application publication number CN117165913A and application publication date December 5, 2023 discloses "A tool with submicron diamond coating, preparation method and application thereof", which specifically includes the following steps: preparing tool substrate, soft abrasive sandblasting, surface roughening, Co removal treatment, and coating deposition.

[0004] During the coating deposition process, the tool needs to be placed in a chemical vapor deposition furnace for coating deposition. However, it is troublesome to load the tool into the furnace body of the chemical vapor deposition furnace, resulting in a low coating deposition efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a method for producing a coated tool, which has the effect of improving the production efficiency of coating deposition.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: A method for producing a coated tool, comprising a substrate pretreatment process A, a furnace loading process B, a coating deposition process C, a quality inspection process D, and a polishing process E. The substrate pretreatment process A comprises the following steps: (A1) firstly placing the tool substrate in an acetone solution for cleaning for 20 minutes, and then placing it in an anhydrous ethanol solution for cleaning for 10 minutes to remove the oil stains on the surface of the tool substrate; (A2) corroding the tool substrate with an alkaline solution for 30 minutes, and after the corrosion is completed, first washing it twice in deionized water and then spraying it for cleaning, and the ratio of the alkaline solution is: KOH:K3 [Fe(CN)6]:H2O=12g:12g:120ml; (A3) Use Caro's acid solution to corrode the tool substrate for 1 minute. After the corrosion is completed, wash it twice in deionized water and then spray it. The ratio of Caro's acid solution is: 98% H2SO4:H2O2=2.4ml:80ml; (A4) Pre-nucleate the diamond suspension with ultrasonic for 60 minutes. The ratio of diamond suspension is: anhydrous ethanol: 0~100nm diamond powder: 4~6nm diamond powder = 80ml:0.5g:0.5g; (A5) Ultrasonic cleaning with anhydrous ethanol for 10 minutes twice;

[0007] The furnace loading process B comprises the following steps: loading a plurality of tool substrates into a chemical vapor deposition furnace;

[0008] The coating deposition process C includes the following steps: introducing H2 and CH4 into the chemical vapor deposition furnace, heating the hot wire to 2500 °C, setting and adjusting the process parameters of gas flow rate, hot wire current, air pressure, and temperature, so that a diamond film with a thickness of 40 μm is deposited on the tool surface to make a diamond-coated tool;

[0009] Part of the structure of the chemical vapor deposition furnace includes a frame, a furnace body installed on the frame, a furnace cover, a feeding and discharging device, and a clamping mechanism arranged on the upper surface of the furnace cover and used for fixing the tool substrate; the opening of the furnace body is arranged downward, and the feeding and discharging device includes an extension frame arranged on the frame, a traveling mechanism arranged on the extension frame and driving the furnace cover to move horizontally, and a lifting mechanism arranged on the frame and driving the furnace cover moved to directly below the furnace body to move upward and then close with the furnace body.

[0010] By adopting the above technical solution, first, in the substrate pretreatment process A, A1 can thoroughly remove the oil stain on the surface of the tool substrate, A2 can corrode tungsten carbide grains, completely expose the binder Co, A3 can etch away the surface Co element, A4 can form defects on the surface of the tool substrate, which are favorable positions for diamond nucleation, thereby increasing the diamond nucleation density in the later stage. At the same time, the diamond powder attached to the surface of the tool substrate can directly serve as the crystal nucleus for diamond nucleation, and A5 can clean the surface of the tool substrate after pre-nucleation treatment to remove surface residual impurities and diamond powder that are not embedded;

[0011] Secondly, in the furnace loading process B, the tool substrate is fixed on the clamping mechanism, the traveling mechanism drives the furnace cover to move to directly below the furnace body, and the lifting mechanism drives the furnace cover to move upward and then close with the furnace body, thereby loading the tool substrate into the chemical vapor deposition furnace. Conversely, the diamond-coated tool after coating deposition is removed, and finally, it has the effect of improving the production efficiency of coating deposition.

[0012] The further setting of the present invention is that: the traveling mechanism includes a moving disk slidably connected to both sides of the extension frame, a traveling motor arranged on the lower surface of the moving disk, a driving gear arranged on the output shaft of the traveling motor, and a driving rack arranged on the extension frame and meshing with the driving gear. A square embedding groove is arranged on the moving disk, and a square embedding part embedded in the square embedding groove is arranged on the lower surface of the furnace cover; plugging parts are突出ly arranged on both sides of the furnace cover; the lifting mechanism includes two oil cylinders arranged on the frame, and a lifting frame in a "U" shape arranged on the output shafts of the two oil cylinders. Plugging grooves for the plugging parts on both sides of the furnace cover to be inserted during horizontal movement are arranged on both sides of the lifting frame.

[0013] By adopting the above technical scheme, the travel motor drives the driving gear to rotate, and the driving gear changes the position of meshing with the driving rack, thereby driving the movable plate and the furnace cover to move horizontally; in the process of the travel mechanism driving the furnace cover to move, the furnace cover is moved to a position directly under the furnace body, and the plug-in parts on both sides of the furnace cover are plugged into the plug-in grooves of the lifting frame of the lifting mechanism, and then the furnace cover is driven to move upward through the oil cylinder, and after the furnace cover moves upward, it is closed with the furnace body.

[0014] The present invention is further configured as follows: the clamping mechanism includes a tray which is lifted and lowered on the furnace cover and has array-distributed plug-in holes, a flexible isolation sleeve arranged in the upper end of the plug-in holes, a guide component which is arranged between the extension frame and the tray and is lifted when the furnace cover moves in a direction away from the furnace body, and a plurality of clamping components which are arranged on the tray and are clamped when the tray is separated from the guide component; the portion of the tool substrate which does not require coating deposition is inserted into the plug-in hole after passing through the flexible isolation sleeve; and the clamping component releases the clamping of the tool substrate during the process of the guide component driving the tray to move upward.

[0015] By adopting the above technical scheme, after the walking mechanism drives the furnace cover to move away from the furnace body, it is convenient to disassemble the tool base. At this time, after the part of the tool base that does not need to deposit the coating is inserted into the plug-in hole after passing through the flexible isolation sleeve, the setting of the guide component enables the furnace cover to rise during the movement of the furnace cover in the direction away from the furnace body, and the clamping component gradually releases the clamping of the tool base. At this time, it is convenient to remove the processed diamond coated tool and to install the unprocessed tool base. At the same time, when the tray is separated from the guide component, the clamping component automatically clamps the tool base, which is convenient to use. In addition, the setting of the flexible isolation sleeve can cover and protect the part of the tool base that does not need to deposit the coating.

[0016] The present invention is further configured as follows: a first annular groove surrounding the plug-in hole is provided at the bottom of the tray, two first connecting grooves are provided between the inner circle of the first annular groove and the plug-in groove, the clamping assembly includes two clamping blocks slidably connected in the first connecting groove and used to clamp on the peripheral side of the tool, a lifting sleeve lifted and lowered in the first annular groove, a linkage structure provided between the lifting sleeve and the clamping blocks and driving the two clamping blocks to move in a direction approaching each other during the upward movement of the lifting sleeve, an annular rubber sealing ring is provided at the bottom of the tray; in the process of the tray moving downward along the guide assembly until the tray is separated from the guide assembly, the lifting sleeve is moved upward by the upward force of the furnace cover, so as to drive the two clamping blocks to move in a direction approaching each other through the linkage structure to achieve clamping, and the annular rubber sealing ring is finally pressed tightly between the tray and the furnace cover.

[0017] By adopting the above technical solution, in the process of the tray moving downward along the guide assembly until the tray is separated from the guide assembly, the lifting sleeve moves upward due to the upward force of the furnace cover, so as to drive the two clamping blocks to move toward each other through the linkage structure to achieve clamping; at the same time, in the process of the guide assembly driving the tray to move upward, the lifting sleeve moves downward under the action of gravity, so as to automatically release the clamping of the diamond-coated tool.

[0018] The present invention is further configured as follows: the linkage structure includes a wedge-shaped block arranged at one end of the clamping block away from the plug-in slot, and a wedge-shaped groove arranged on the inner ring of the lifting sleeve and for the wedge-shaped block to be embedded in. During the upward movement of the lifting sleeve, the wedge-shaped groove drives the wedge-shaped block to move in a direction close to the plug-in slot.

[0019] By adopting the above technical solution, the linkage structure includes a wedge block arranged at the end of the clamping block away from the plug-in slot, and a wedge groove arranged on the inner ring of the lifting sleeve and for the wedge block to be embedded in. During the upward movement of the lifting sleeve, the wedge groove drives the wedge block to move in the direction close to the plug-in slot, thereby driving the two clamping blocks to approach each other to achieve clamping of the tool base.

[0020] The present invention is further configured as follows: a second annular groove is provided in the middle of the plug-in hole, a second connecting groove connected to the bottom of the second annular groove is provided at the bottom of the tray, the clamping assembly includes a plurality of annular air bags respectively arranged in the plurality of second annular grooves, a pressing air bag arranged on the lower surface of the tray, and a plurality of connecting air pipes arranged between the pressing air bags and the annular air bags and passing through the second connecting grooves, and in the process of the tray moving downward along the guide assembly until the tray is separated from the guide assembly, the pressing air bag is pressurized so that the annular air bag is inflated and clamping is achieved.

[0021] By adopting the above technical solution, when the tray moves downward along the guide assembly until the tray is separated from the guide assembly, the pressing airbag is pressurized so that the annular airbag is inflated and clamping is achieved.

[0022] The present invention is further configured as follows: the guide assembly includes two guide frames arranged on both sides of the extension frame and guide blocks arranged on both sides of the tray; the guide frame includes a straight guide section and an inclined guide section with one end connected to the straight guide section and the other end extending downwardly in a direction close to the furnace body; the guide blocks on both sides of the tray are placed on the two guide frames during the movement in the direction away from the furnace body; and the clamping assembly releases the clamping when the tray is on the straight guide section.

[0023] By adopting the above technical solution, the guide assembly includes two guide frames and two guide blocks. The guide frame includes a straight guide section and an inclined guide section with one end connected to the straight guide section and the other end extending downwardly toward the direction close to the furnace body, so that the clamping assembly releases the clamping when the tray is on the straight guide section.

[0024] The present invention is further configured as follows: a countersunk hole communicating with the bottom of the plug hole is provided at the bottom of the tray corresponding to the plug hole, and a height adjustment screw for abutting against the lower end of the tool base is threadedly connected to the countersunk hole.

[0025] By adopting the above technical solution, different types of tool bases have different lengths. At this time, by setting a height adjustment screw, the depth of the height adjustment screw embedded in the plug-in hole can be adjusted to achieve clamping and installation of tool bases of different types.

[0026] The present invention is further configured as follows: in the coating deposition step C, a cooling process is used for deposition, and the cooling process is divided into the following stages:

[0027] Stage 1: At 0 minutes, the current was 65A, the voltage was 7.6V, the hydrogen was 198sccm, the methane was 2.8sccm, and the pressure was 0.31kPa;

[0028] Stage 2: 10 minutes, current 62A, voltage 7V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0029] Stage 3: 20 minutes, current 57A, voltage 6.3V, hydrogen 198sccm, methane 2.8sccm, pressure 0.32kPa;

[0030] Stage 4: 30 minutes, current 51A, voltage 5.7V, hydrogen 198sccm, methane 2.8sccm, pressure 0.32kPa;

[0031] Stage 5: 35 minutes, current 50A, voltage 5.4V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0032] Stage 6: 40 minutes, current 47A, voltage 5.1V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0033] Stage 7: 45 minutes, current 42A, voltage 4.9V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0034] Stage 8: 50 minutes, current 37A, voltage 4.6V, hydrogen 198sccm, methane 2.8sccm, pressure 0.32kPa;

[0035] Stage 9: 55 minutes, current 32A, voltage 3.8V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0036] Stage 10: At 60 minutes, the current was 27A, the voltage was 3.2V, the hydrogen was 198sccm, the methane was 2.8sccm, and the pressure was 0.31kPa;

[0037] Stage 11: 70 minutes, current 25A, voltage 3V, hydrogen 198sccm, methane 2.8sccm, pressure 0.33kPa;

[0038] Stage 12: 80 minutes, current 23A, voltage 2.8V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0039] Stage 13: 90 minutes, current 19A, voltage 2.4V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0040] Stage 14: 100 minutes, current 16A, voltage 2.2V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0041] Stage 15: 120 minutes, current 13A, voltage 2.1V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0042] Stage 16: 130 minutes, current 10A, voltage 1.7V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0043] Stage 17: 140 minutes, current 5A, voltage 1.3V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0044] Stage 18: 150 minutes, current 3A, voltage 0.8V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0045] Stage 19: At 165 minutes, the current was 0 A, the voltage was 0 V, the hydrogen was 198 sccm, the methane was 2.8 sccm, and the pressure was 0.31 kPa.

[0046] The present invention is further configured as follows: the quality inspection process D comprises the following steps: using a diamond indenter to test the bonding strength, pressing the diamond indenter of the diamond indenter into the surface of the diamond coating, and observing whether the diamond coating cracks or falls off around the indentation. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a result diagram of the diamond indentation test in Example 1;

[0048] Figure 2 is a structural schematic diagram of a part of the structure of the chemical vapor deposition furnace in Example 1;

[0049] Figure 3 is a schematic diagram of a partial structure of the chemical vapor deposition furnace in Example 1 (structure and Figure 2 Same, but with different markings);

[0050] Figure 4 It is a structural schematic diagram of the furnace cover, the clamping mechanism, and part of the feeding and discharging device in Example 1;

[0051] Figure 5 yes Figure 4 A local enlarged view at A in the figure;

[0052] Figure 6 It is a structural schematic diagram of the furnace cover and the clamping mechanism in Example 2;

[0053] Figure 7 yes Figure 6 A partial enlarged view of point B in the figure.

[0054] Reference numerals: 1, frame; 2, furnace body; 3, furnace cover; 31, square embedded part; 32, plug-in part; 4, feeding and discharging device; 41, extension frame; 42, walking mechanism; 421, moving plate; 4211, square embedded slot; 422, walking motor; 423, driving gear; 424, driving rack; 43, lifting mechanism; 431, oil cylinder; 432, lifting frame; 4321, plug-in slot; 5, clamping mechanism; 51, tray; 511, plug-in hole; 512, first annular slot; 513, first connecting slot; 51 4. Second annular groove; 515. Second connecting groove; 516. Annular rubber sealing ring; 517. Countersunk hole; 518. Height adjustment screw; 52. Flexible isolation sleeve; 53. Guide assembly; 531. Guide frame; 5311. Straight guide section; 5312. Inclined guide section; 532. Guide block; 54. Clamping assembly; 541. Clamping block; 542. Lifting sleeve; 543. Linkage structure; 5431. Wedge block; 5432. Wedge groove; 544. Annular airbag; 545. Pressing airbag; 546. Connecting air pipe. DETAILED DESCRIPTION

[0055] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0056] Embodiment 1: A method for producing a coated tool, comprising a substrate pretreatment step A, a furnace loading step B, a coating deposition step C, a quality inspection step D, and a polishing step E.

[0057] The substrate pretreatment process A includes the following steps: (A1) firstly wash the tool substrate in an acetone solution for 20 minutes, and then wash it in an anhydrous ethanol solution for 10 minutes to remove the oil stains on the surface of the tool substrate; (A2) corrode the tool substrate with an alkaline solution for 30 minutes, and after the corrosion is completed, wash it twice in deionized water and then spray it, and the ratio of the alkaline solution is: KOH:K3[Fe(CN)6]:H2O=12g:12g:120ml; (A3) use Caro acid The tool substrate was corroded by solution for 1 minute. After the corrosion was completed, it was first washed twice in deionized water and then spray washed. The ratio of Caro's acid solution was: 98% H2SO4:H2O2=2.4ml:80ml; (A4) The diamond suspension was ultrasonically pre-nucleated for 60 minutes. The ratio of the diamond suspension was: anhydrous ethanol: 0~100nm diamond powder: 4~6nm diamond powder = 80ml:0.5g:0.5g; (A5) Ultrasonic cleaning was performed twice with anhydrous ethanol for 10 minutes.

[0058] The furnace loading process B comprises the following steps: loading a plurality of tool substrates into a chemical vapor deposition furnace.

[0059] The coating deposition process C includes the following steps: introducing H2 and CH4 into the chemical meteorological deposition furnace, heating the hot wire to 2500°C, setting and adjusting the process parameters of gas flow, hot wire current, gas pressure, and temperature, so that a diamond film with a thickness of 40um is deposited on the surface of the tool to make a diamond coated tool.

[0060] In the coating deposition process C, a cooling process is used for deposition, and the cooling process is divided into the following stages:

[0061] Stage 1: At 0 minutes, the current was 65A, the voltage was 7.6V, the hydrogen was 198sccm, the methane was 2.8sccm, and the pressure was 0.31kPa;

[0062] Stage 2: 10 minutes, current 62A, voltage 7V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0063] Stage 3: 20 minutes, current 57A, voltage 6.3V, hydrogen 198sccm, methane 2.8sccm, pressure 0.32kPa;

[0064] Stage 4: 30 minutes, current 51A, voltage 5.7V, hydrogen 198sccm, methane 2.8sccm, pressure 0.32kPa;

[0065] Stage 5: 35 minutes, current 50A, voltage 5.4V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0066] Stage 6: 40 minutes, current 47A, voltage 5.1V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0067] Stage 7: 45 minutes, current 42A, voltage 4.9V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0068] Stage 8: 50 minutes, current 37A, voltage 4.6V, hydrogen 198sccm, methane 2.8sccm, pressure 0.32kPa;

[0069] Stage 9: 55 minutes, current 32A, voltage 3.8V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0070] Stage 10: At 60 minutes, the current was 27A, the voltage was 3.2V, the hydrogen was 198sccm, the methane was 2.8sccm, and the pressure was 0.31kPa;

[0071] Stage 11: 70 minutes, current 25A, voltage 3V, hydrogen 198sccm, methane 2.8sccm, pressure 0.33kPa;

[0072] Stage 12: 80 minutes, current 23A, voltage 2.8V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0073] Stage 13: 90 minutes, current 19A, voltage 2.4V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0074] Stage 14: 100 minutes, current 16A, voltage 2.2V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0075] Stage 15: 120 minutes, current 13A, voltage 2.1V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa;

[0076] Stage 16: At 130 minutes, current is 10 A, voltage is 1.7 V, hydrogen is 198 sccm, methane is 2.8 sccm, and air pressure is 0.31 kPa;

[0077] Stage 17: At 140 minutes, current is 5 A, voltage is 1.3 V, hydrogen is 198 sccm, methane is 2.8 sccm, and air pressure is 0.31 kPa;

[0078] Stage 18: At 150 minutes, current is 3 A, voltage is 0.8 V, hydrogen is 198 sccm, methane is 2.8 sccm, and air pressure is 0.31 kPa;

[0079] Stage 19: At 165 minutes, current is 0 A, voltage is 0 V, hydrogen is 198 sccm, methane is 2.8 sccm, and air pressure is 0.31 kPa.

[0080] Quality inspection process D includes the following steps: using a diamond indentation instrument to test the bonding strength, pressing the diamond indenter of the diamond indentation machine into the surface of the diamond coating, and observing whether there is cracking and peeling of the diamond coating around the indentation. The results of the indentation test are as Figure 1 shown. It can be seen that there is no cracking and peeling of the diamond coating around the indentation, and the diamond coating at the center of the indentation pit is still firmly bonded to the diamond-coated cutting tool.

[0081] As Figure 2 shown, some structures of the chemical vapor deposition furnace include a frame 1, a furnace body 2 installed on the frame 1, a furnace cover 3, a feeding and discharging device 4, and a clamping mechanism 5 arranged on the upper surface of the furnace cover 3 to fix the tool substrate; the opening of the furnace body 2 is arranged downward, and the feeding and discharging device 4 includes an extension frame 41 arranged on the frame 1, a traveling mechanism 42 arranged on the extension frame 41 to drive the furnace cover 3 to move horizontally, and a lifting mechanism 43 arranged on the frame 1 to drive the furnace cover 3 moved to directly below the furnace body 2 to move upward and then close with the furnace body 2.

[0082] As Figures 2 to 4 shown, the traveling mechanism 42 includes a moving disk 421 slidably connected to both sides of the extension frame 41, a traveling motor 422 arranged on the lower surface of the moving disk 421, a driving gear 423 arranged on the output shaft of the traveling motor 422, and a driving rack 424 arranged on the extension frame 41 and meshing with the driving gear 423. A square embedding groove 4211 is arranged on the moving disk 421, and a square embedding portion 31 embedded in the square embedding groove 4211 is arranged on the lower surface of the furnace cover 3. Plug-in portions 32 are突出ly arranged on both sides of the furnace cover 3. The lifting mechanism 43 includes two oil cylinders 431 arranged on the frame 1 and a lifting frame 432 in a "U" shape arranged on the output shafts of the two oil cylinders 431. Plug-in slots 4321 for the plug-in portions 32 on both sides of the furnace cover 3 to be inserted during horizontal movement are arranged on both sides of the lifting frame 432.

[0083] like Figures 2 to 4 As shown, the clamping mechanism 5 includes a tray 51 which is lifted and lowered on the furnace cover 3 and has array-distributed plug-in holes 511, a flexible isolation sleeve 52 arranged in the upper end of the plug-in hole 511, a guide component 53 which is arranged between the extension frame 41 and the tray 51 and is lifted when the furnace cover 3 moves in a direction away from the furnace body 2, and a plurality of clamping components 54 which are arranged on the tray 51 and are clamped when the tray 51 is separated from the guide component 53. The part of the tool substrate on which no coating needs to be deposited passes through the flexible isolation sleeve 52 and is inserted into the plug-in hole 511. When the guide component 53 drives the tray 51 to move upward, the clamping component 54 releases the clamping of the tool substrate.

[0084] like Figure 4 and Figure 5 As shown, a first annular groove 512 surrounding the plug-in hole 511 is provided at the bottom of the tray 51, and two first connecting grooves 513 are provided between the inner circle of the first annular groove 512 and the plug-in groove 4321. The clamping assembly 54 includes two clamping blocks 541 slidably connected in the first connecting groove 513 and used to clamp the peripheral side of the tool, a lifting sleeve 542 lifted and arranged in the first annular groove 512, and a linkage structure 543 arranged between the lifting sleeve 542 and the clamping blocks 541 and driving the two clamping blocks 541 to move towards each other during the upward movement of the lifting sleeve 542. An annular rubber sealing ring 516 is provided at the bottom of the tray 51; in the process of the tray 51 moving downward along the guide assembly 53 until the tray 51 is separated from the guide assembly 53, the lifting sleeve 542 moves upward under the upward force of the furnace cover 3, so as to drive the two clamping blocks 541 to move towards each other through the linkage structure 543 to achieve clamping, and the annular rubber sealing ring 516 is finally pressed between the tray 51 and the furnace cover 3. The linkage structure 543 includes a wedge-shaped block 5431 arranged at the end of the clamping block 541 away from the plug-in slot 4321, and a wedge-shaped slot 5432 arranged on the inner circle of the lifting sleeve 542 and for the wedge-shaped block 5431 to be embedded in. During the upward movement of the lifting sleeve 542, the wedge-shaped slot 5432 drives the wedge-shaped block 5431 to move toward the direction close to the plug-in slot 4321.

[0085] like Figures 2 to 4 As shown, the guide assembly 53 includes two guide frames 531 arranged on both sides of the extension frame 41, and guide blocks 532 arranged on both sides of the tray 51. The guide frame 531 includes a straight guide section 5311, and an inclined guide section 5312 whose one end is connected to the straight guide section 5311 and the other end is inclined and extends downward toward the direction close to the furnace body 2. The guide blocks 532 on both sides of the tray 51 are placed on the two guide frames 531 during the movement toward the direction away from the furnace body 2. When the tray 51 is on the straight guide section 5311, the clamping assembly 54 releases the clamping.

[0086] like Figure 4 and Figure 5 As shown, a countersunk hole 517 communicating with the bottom of the plug hole 511 is provided at the bottom of the tray 51 corresponding to the plug hole 511, and a height adjustment screw 518 for abutting against the lower end of the tool base is threadedly connected at the countersunk hole 517.

[0087] Implementation effect: First, in the matrix pretreatment process A, A1 can completely remove the oil stains on the surface of the tool matrix, A2 can corrode the tungsten carbide grains to completely expose the binder Co, A3 can etch the Co element on the surface, and A4 can form defects on the surface of the tool matrix. These defects are favorable positions for the nucleation of diamonds, thereby increasing the density of diamond nucleation in the later stage. At the same time, the diamond powder attached to the surface of the tool matrix can be directly used as the crystal nucleus of diamond nucleation. A5 can clean the surface of the tool matrix after pre-nucleation treatment to remove residual impurities on the surface and diamond powder that is not embedded. Secondly, in the furnace loading process B, the tool matrix is ​​fixed on the clamping mechanism 5, the walking mechanism 42 drives the furnace cover 3 to move to the bottom of the furnace body 2, and the lifting mechanism 43 drives the furnace cover 3 to move upward and close with the furnace body 2, so that the tool matrix is ​​loaded into the chemical vapor deposition furnace. Otherwise, the diamond coated tool after coating deposition is removed, which ultimately has the effect of improving the production efficiency of coating deposition.

[0088] The driving gear 423 is driven to rotate by the travel motor 422, and the driving gear 423 changes the position of meshing with the driving rack 424, thereby driving the movable plate 421 and the furnace cover 3 to move horizontally; in the process of the travel mechanism 42 driving the furnace cover 3 to move, the furnace cover 3 is moved to a position directly below the furnace body 2, and the plug-in parts 32 on both sides of the furnace cover 3 are plugged into the plug-in grooves 4321 of the lifting frame 432 of the lifting mechanism 43, and then the furnace cover 3 is driven to move upward through the oil cylinder 431, and then the furnace cover 3 is driven to move upward and is closed with the furnace body 2.

[0089] After the walking mechanism 42 drives the furnace cover 3 to move away from the furnace body 2, it is convenient to disassemble the tool base. At this time, after the part of the tool base that does not need to deposit the coating is inserted into the plug-in hole 511 after passing through the flexible isolation sleeve 52, the setting of the guide component 53 enables the furnace cover 3 to rise during the movement in the direction away from the furnace body 2, and the clamping component 54 gradually releases the clamping of the tool base. At this time, it is convenient to remove the processed diamond-coated tool and to install the unprocessed tool base. At the same time, when the tray 51 is separated from the guide component 53, the clamping component 54 automatically clamps the tool base, which is convenient to use. In addition, the setting of the flexible isolation sleeve 52 can cover and protect the part of the tool base that does not need to deposit the coating.

[0090] When the tray 51 moves downward along the guide assembly 53 until the tray 51 separates from the guide assembly 53, the lifting sleeve 542 moves upward under the upward force of the furnace cover 3, so as to drive the two clamping blocks 541 to move toward each other through the linkage structure 543 to achieve clamping; at the same time, when the guide assembly 53 drives the tray 51 to move upward, the lifting sleeve 542 moves downward under the action of gravity to automatically release the clamping of the diamond coated tool. The linkage structure 543 includes a wedge block 5431 arranged at the end of the clamping block 541 away from the plug-in slot 4321, and a wedge groove 5432 arranged on the inner circle of the lifting sleeve 542 and for the wedge block 5431 to be embedded. When the lifting sleeve 542 moves upward, the wedge groove 5432 drives the wedge block 5431 to move toward the plug-in slot 4321, thereby driving the two clamping blocks 541 to approach each other to achieve clamping of the tool base.

[0091] Embodiment 2: A method for producing a coated tool, comprising: Figures 2 to 5 Based on Figure 6 , Figure 7 , which is different from Example 1 in that the structure of the clamping assembly 54 in the chemical vapor deposition furnace is different, a second annular groove 514 is provided in the middle of the plug-in hole 511, and a second connecting groove 515 connected to the bottom of the second annular groove 514 is provided at the bottom of the tray 51. The clamping assembly 54 includes a plurality of annular air bags 544 respectively arranged in the plurality of second annular grooves 514, a pressing air bag 545 arranged on the lower surface of the tray 51, and a plurality of connecting air pipes 546 arranged between the pressing air bag 545 and the annular air bag 544 and passing through the second connecting groove 515. When the tray 51 moves downward along the guide assembly 53 until the tray 51 is separated from the guide assembly 53, the pressing air bag 545 is pressurized so that the annular air bag 544 is inflated and clamping is achieved.

[0092] Implementation effect: When the tray 51 moves downward along the guide assembly 53 until the tray 51 is separated from the guide assembly 53, the pressing airbag 545 is pressurized so that the annular airbag 544 is inflated and clamped, which facilitates the realization or release of clamping.

[0093] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A method for producing a coated tool, comprising a substrate pretreatment step A, a furnace loading step B, a coating deposition step C, a quality inspection step D, and a polishing step E, characterized in that: The substrate pretreatment process A comprises the following steps: (A1) First, wash the tool substrate in acetone solution for 20 minutes, and then wash it in anhydrous ethanol solution for 10 minutes to remove the oil stains on the surface of the tool substrate; (A2) The tool substrate is corroded with an alkaline solution for 30 minutes. After the corrosion is completed, it is first rinsed twice in deionized water and then spray-rinsed. The ratio of the alkaline solution is: KOH: K3[Fe(CN)6]: H2O = 12g: 12g: 120ml; (A3) Use Caro's acid solution to corrode the tool substrate for 1 minute. After the corrosion is completed, wash it twice in deionized water and then spray it. The ratio of Caro's acid solution is: 98% H2SO4:H2O2=2.4ml:80ml; (A4) Diamond suspension was ultrasonically pre-nucleated for 60 minutes. The ratio of diamond suspension was: anhydrous ethanol: 0-100 nm diamond powder: 4-6 nm diamond powder = 80 ml: 0.5 g: 0.5 g; (A5) ultrasonic cleaning with anhydrous ethanol for 10 min twice; The furnace loading process B comprises the following steps: loading a plurality of tool substrates into a chemical vapor deposition furnace; The coating deposition process C includes the following steps: introducing H2 and CH4 into a chemical atmospheric deposition furnace, heating the hot wire to 2500°C, setting and adjusting the process parameters of gas flow, hot wire current, gas pressure, and temperature, so that a diamond film with a thickness of 40 μm is deposited on the surface of the tool to produce a diamond coated tool; Part of the structure of the chemical vapor deposition furnace comprises a frame (1), a furnace body (2) mounted on the frame (1), a furnace cover (3), a material inlet and outlet device (4), and a clamping mechanism (5) arranged on the upper surface of the furnace cover (3) and capable of fixing a tool base; the opening of the furnace body (2) is arranged downward, and the material inlet and outlet device (4) comprises an extension frame (41) arranged on the frame (1), a walking mechanism (42) arranged on the extension frame (41) and capable of driving the furnace cover (3) to move horizontally, and a lifting mechanism (43) arranged on the frame (1) and capable of driving the furnace cover (3) moved to the bottom of the furnace body (2) to move upward and then close to the furnace body (2); The walking mechanism (42) includes a moving disk (421) slidably connected to both sides of the extension frame (41), a walking motor (422) arranged on the lower surface of the moving disk (421), a driving gear (423) arranged on the output shaft of the walking motor (422), and a driving rack (424) arranged on the extension frame (41) and meshed with the driving gear (423). A square embedding groove (4211) is arranged on the moving disk (421), and a square embedding portion (31) embedded in the square embedding groove (4211) is arranged on the lower surface of the furnace cover (3); Plugging portions (32) protrude from both sides of the furnace cover (3); The lifting mechanism (43) includes two oil cylinders (431) arranged on the machine frame (1), and a lifting frame (432) in a "U" shape arranged on the output shafts of the two oil cylinders (431). Plugging slots (4321) are arranged on both sides of the lifting frame (432) for the plugging portions (32) on both sides of the furnace cover (3) to be inserted during horizontal movement. The clamping mechanism (5) includes a tray (51) arranged on the furnace cover (3) in a lifting manner and having plugging holes (511) distributed in an array, a flexible isolation sleeve (52) arranged inside the upper ends of the plugging holes (511), a guiding component (53) arranged between the extension frame (41) and the tray (51) and rising during the movement of the furnace cover (3) away from the furnace body (2), and a plurality of clamping components (54) arranged on the tray (51) and clamping when the tray (51) is separated from the guiding component (53). The part of the tool substrate that does not need to be coated passes through the flexible isolation sleeve (52) and then is inserted into the plugging holes (511). During the upward movement of the tray (51) driven by the guiding component (53), the clamping components (54) release the clamping of the tool substrate.

2. The method for producing a coated tool according to claim 1, characterized in that: A first annular groove (512) surrounding the plugging holes (511) is arranged at the bottom of the tray (51). Two first communication grooves (513) are arranged between the inner ring of the first annular groove (512) and the plugging slots (4321). The clamping components (54) include two clamping blocks (541) slidably connected in the first communication grooves (513) and used for clamping the circumferential side of the tool, a lifting sleeve (542) arranged in the first annular groove (512) in a lifting manner, and a linkage structure (543) arranged between the lifting sleeve (542) and the clamping blocks (541) and driving the two clamping blocks (541) to move towards each other during the upward movement of the lifting sleeve (542). A ring-shaped rubber sealing ring (516) is arranged at the bottom of the tray (51); During the downward movement of the tray (51) along the guiding component (53) until the tray (51) is separated from the guiding component (53), the lifting sleeve (542) moves upward under the upward acting force of the furnace cover (3) to drive the two clamping blocks (541) to move towards each other through the linkage structure (543) to achieve clamping, and the ring-shaped rubber sealing ring (516) finally abuts tightly between the tray (51) and the furnace cover (3).

3. The method for producing a coated tool according to claim 2, characterized in that: The linkage structure (543) comprises a wedge-shaped block (5431) arranged at one end of the clamping block (541) away from the plug-in slot (4321), and a wedge-shaped slot (5432) arranged on the inner circle of the lifting sleeve (542) and for the wedge-shaped block (5431) to be embedded in. When the lifting sleeve (542) moves upward, the wedge-shaped slot (5432) drives the wedge-shaped block (5431) to move in a direction close to the plug-in slot (4321).

4. The method for producing a coated tool according to claim 1, characterized in that: A second annular groove (514) is provided in the middle of the plug hole (511), and a second connecting groove (515) connected to the bottom of the second annular groove (514) is provided at the bottom of the tray (51). The clamping assembly (54) comprises a plurality of annular air bags (544) respectively arranged in the plurality of second annular grooves (514), a pressing air bag (545) arranged on the lower surface of the tray (51), and a plurality of connecting air pipes (546) arranged between the pressing air bags (545) and the annular air bags (544) and passing through the second connecting grooves (515). When the tray (51) moves downward along the guide assembly (53) until the tray (51) is separated from the guide assembly (53), the pressing air bags (545) are compressed so that the annular air bags (544) are inflated and clamping is achieved.

5. A method for producing a coated tool according to claim 2 or 3, characterized in that: The guide assembly (53) comprises two guide frames (531) arranged on both sides of the extension frame (41), and guide blocks (532) arranged on both sides of the tray (51); the guide frame (531) comprises a straight guide section (5311), and an inclined guide section (5312) having one end connected to the straight guide section (5311) and the other end extending downwardly in a direction close to the furnace body (2); the guide blocks (532) on both sides of the tray (51) rest on the two guide frames (531) during movement in a direction away from the furnace body (2); and the clamping assembly (54) releases the clamping when the tray (51) is on the straight guide section (5311).

6. The method for producing a coated tool according to claim 1, characterized in that: A countersunk hole (517) communicating with the bottom of the plugging hole (511) is provided at the bottom of the tray (51) corresponding to the plugging hole (511), and a height adjustment screw (518) for abutting against the lower end of the tool base is threadedly connected to the countersunk hole (517).

7. The method for producing a coated tool according to claim 1, characterized in that: In the coating deposition process C, a cooling process is used for deposition, and the cooling process is divided into the following stages: Stage 1: At 0 minutes, the current was 65A, the voltage was 7.6V, the hydrogen was 198sccm, the methane was 2.8sccm, and the pressure was 0.31kPa; Stage 2: 10 minutes, current 62A, voltage 7V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa; Stage 3: 20 minutes, current 57A, voltage 6.3V, hydrogen 198sccm, methane 2.8sccm, pressure 0.32kPa; Stage 4: 30 minutes, current 51A, voltage 5.7V, hydrogen 198sccm, methane 2.8sccm, pressure 0.32kPa; Stage 5: 35 minutes, current 50A, voltage 5.4V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa; Stage 6: 40 minutes, current 47A, voltage 5.1V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa; Stage 7: 45 minutes, current 42A, voltage 4.9V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa; Stage 8: 50 minutes, current 37A, voltage 4.6V, hydrogen 198sccm, methane 2.8sccm, pressure 0.32kPa; Stage 9: 55 minutes, current 32A, voltage 3.8V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa; Stage 10: 60 minutes, current 27A, voltage 3.2V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa; Stage 11: 70 minutes, current 25A, voltage 3V, hydrogen 198sccm, methane 2.8sccm, pressure 0.33kPa; Stage 12: 80 minutes, current 23A, voltage 2.8V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa; Stage 13: 90 minutes, current 19A, voltage 2.4V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa; Stage 14: 100 minutes, current 16A, voltage 2.2V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa; Stage 15: 120 minutes, current 13A, voltage 2.1V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa; Stage 16: 130 minutes, current 10A, voltage 1.7V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa; Stage 17: 140 minutes, current 5A, voltage 1.3V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa; Stage 18: 150 minutes, current 3A, voltage 0.8V, hydrogen 198sccm, methane 2.8sccm, pressure 0.31kPa; Stage 19: At 165 minutes, the current was 0 A, the voltage was 0 V, the hydrogen was 198 sccm, the methane was 2.8 sccm, and the pressure was 0.31 kPa.

8. The method for producing a coated tool according to claim 1, characterized in that: The quality inspection process D includes the following steps: using a diamond indenter to test the bonding strength, pressing the diamond indenter of the diamond indenter into the surface of the diamond coating, and observing whether the diamond coating cracks or falls off around the indentation.

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