A device and method for passivating micro-defects on the cutting edge before tool coating

Abstract

This invention relates to the field of finishing grinding equipment technology, specifically to a device and method for passivating microscopic defects on the cutting edge before tool coating. It includes a sand basin fixedly mounted on the top of a base, containing abrasive grains for grinding twist drill bits. The sand basin contains multiple abrasive grain-gathering components, each including a self-rotating gathering cover. When multiple drive columns rotate with the gathering cover, the drive columns drive a lifting cap at the top of the main rod to rise. The rising lifting cap pulls intact abrasive grains closer to the bottom of the tool to be ground. Simultaneously, the angular velocity difference between the stationary lifting cap and the rotating gathering cover disturbs the abrasive grains, causing separation between intact and fine powdery abrasive grains. The gap between the lifting cap and the side wall of the gathering cover maintains the discharge of fine powdery abrasive grains, but the diameter of this gap is smaller than the diameter of the abrasive grains, thus preventing intact abrasive grains from falling off.

Description

Technical Field

[0001] This invention relates to the field of finishing grinding equipment technology, and more specifically, to a device and method for passivating microscopic defects on the cutting edge before tool coating. Background Technology

[0002] Before coating, the cutting edge of twist drill tools is dulled using agitated walnut shell abrasive. Its main function is to remove burrs and dull the cutting edge. Walnut shell abrasive has low hardness and high brittleness; after continuous impact and friction with the high-speed rotating tool, it quickly breaks into fine powder. This fine powder cannot effectively cut the tool surface, leading to decreased grinding efficiency. When the tool rotates at high speed, it creates a "ring-shaped vortex" around the abrasive particles, causing these particles to be flung out, forming localized "abrasive voids" (especially at the top of the spiral groove), resulting in insufficient grinding in that area.

[0003] To address these issues, existing passivation devices employ a converging shroud around the twist drill to gather abrasive particles. However, the converging effect of the shroud is limited to the circumference of the twist drill. This is because it relies on the centrifugal force of the twist drill during high-speed rotation, which generates friction between the abrasive particles and the drill's sidewalls. However, the abrasive particles at the bottom of the twist drill experience downward pressure due to gravity, preventing them from exerting upward pressure on the top of the particles and the burrs at the bottom of the drill. Furthermore, the abrasive particles inside the shroud are ground into fine powder due to the strong friction of the twist drill, which cannot be effectively removed from the shroud during grinding. Consequently, effective grinding of the bottom and surrounding areas of the twist drill becomes difficult.

[0004] In view of this, we propose a device and method for passivating micro-defects on the cutting edge before tool coating to improve the shortcomings of the prior art. Summary of the Invention

[0005] One of the objectives of this invention is to provide a device for passivating micro-defects on the cutting edge before coating a cutting tool. This device solves the problem that burrs on the bottom of a twist drill are more likely to form a vacuum zone due to its rotational action. At the same time, the sand particles located inside the gathering cover are ground into fine powder due to the strong friction of the twist drill, making it difficult to effectively grind the bottom and surrounding area of ​​the twist drill.

[0006] To achieve the above objectives, the tool coating pre-coating micro-defect passivation device for the cutting edge includes a base and a sand basin disposed on the top of the base. The sand basin contains a plurality of gathering components, and the gathering components include a gathering cover capable of rotation.

[0007] The grinding shield is a hollow structure with an open top, used to pass through and blunt the rotating tool, with the tool rotating in the opposite direction to the grinding shield. The grinding force on the cutting edge of the tool is provided by the sum of the rotational speeds of the grinding shield and the tool. Compared to the cases where the grinding shield remains stationary or rotates in the same direction as the tool, the grinding shield rotates in the opposite direction to the tool, which improves the grinding efficiency of burrs on the cutting edge of the tool.

[0008] A lifting assembly is provided near the bottom of the inner cavity of the gathering cover, and the lifting assembly includes:

[0009] The main rod is slidably connected to the bottom of the sand basin. When the main rod rises due to disturbance at the bottom, it pulls the sand upwards and closer to the bottom of the tool, increasing the normal force between the sand and the tool. According to the friction formula, while keeping the friction coefficient constant, the greater the normal force of the sand on the bottom of the tool, the greater the friction between the sand and the tool, and thus the higher the passivation grinding efficiency of the tool.

[0010] The lifting cap, with its edge forming a gap with the inner wall of the gathering hood, allows only fine powdery sand particles to pass through. It remains stationary on the horizontal plane, and the angular velocity difference between it and the gathering hood creates a disturbance to the sand. It moves up and down synchronously with the main rod, intermittently squeezing the sand particles to contact the bottom of the twist drill. Because the friction and gravity between the fine powdery sand and the intact sand and the lifting cap are different, the fine powdery sand gradually falls to the bottom layer, while the intact sand particles remain on the top layer. That is, after screening, the sand particles maintain a larger size at the top and a smaller size at the bottom.

[0011] The edge and the inner wall of the collecting hood form a feeding gap that allows only fine powdery sand particles to pass through. It remains stationary on the horizontal plane, and the angular velocity difference between it and the collecting hood creates a disturbance to the sand and gravel.

[0012] In the above technical solution, an installation platform is provided above the sand basin, and a lifting assembly is provided at the bottom of the installation platform. The lifting assembly includes a hydraulic rod and a lifting platform for installing multiple rotating and fixed components. The cylinder of the hydraulic rod is fixedly connected to the installation platform, and the piston end of the hydraulic rod is fixedly connected to the lifting platform.

[0013] The top of the lifting platform is fixedly connected to multiple guide rods, which are slidably connected to the mounting platform to maintain the stability of the multiple rotating and fixed components in their circumferential direction when they are working.

[0014] In another technical solution, the lower part of the lifting platform is connected to multiple rotating and fixing components. Each rotating and fixing component includes a rotating shaft that is rotatably connected to the lifting platform. The bottom of the rotating shaft is integrally connected to multiple grippers for fixing the cutting tools. The multiple grippers are arranged in a circular array, and the periphery of the multiple grippers is threaded with fixing bolts.

[0015] The rotating shaft and the gathering cover rotate in opposite directions. When the twist drill rotates at high speed, assuming clockwise rotation, its surface spiral grooves will generate clockwise friction on the contacting sand grains. If the sand grains are only subjected to this force, they are prone to rotating synchronously with the drill bit, i.e., "slipping," making it difficult to enter the cutting zone of the tool. When the gathering cover rotates counterclockwise, its inner wall generates counterclockwise friction on the sand grains—the two opposing frictional forces form a shearing force, forcing the sand grains to move along the spiral trajectory towards the center of the tool, i.e., the axis area where the cutting edge is located, in a balance between "clockwise dragging" and "counterclockwise blocking," rather than spinning idly with the tool or the gathering cover. For coarse sand with a larger particle size, this shearing force can "correct" its direction of movement, ensuring that the sand grains can accurately enter the cutting range of the tool.

[0016] Based on the above scheme, the gathering cover is rotatably connected to the fixed cover on the top of the sand basin. A driven gear is integrally provided on the outer periphery of the part of the gathering cover above the fixed cover of the sand basin. A driving gear is meshed on one side of the driven gear. The driving gear is rotatably connected to the fixed cover of the sand basin.

[0017] Furthermore, the periphery of the gathering cover is provided with a guide slope for driving the sand particles in the sand basin to rise, and the side wall of the gathering cover has multiple feed holes at the top of the highest point of the guide slope, and each feed hole has a baffle plate at its edge for guiding the sand particles into the interior of the gathering cover.

[0018] In the above scheme, the lifting component includes multiple drive columns fixedly connected to the inner wall of the gathering cover, and multiple limit bolts fixedly connected to the bottom of the main rod. Each limit bolt is arranged in a ring array about the axis of the main rod, and the multiple limit bolts are spaced apart. The height of the bottom of the limit bolt is lower than the height of the top of the drive column.

[0019] Furthermore, the limiting bolt is fan-shaped to extend the time it takes for the main rod to be lifted by the driving column, the diameter of the lifting cap is larger than the diameter of the main rod, and the bottom of the main rod is provided with a lifting plate with a diameter larger than itself.

[0020] The second objective of this invention is to provide a passivation method for a tool before coating to passivate micro-defects on the cutting edge, comprising the following steps:

[0021] S1. Fix the tool to be sharpened to the bottom of the rotating fixing assembly;

[0022] S2. The cutting edge of the tool is driven by the lifting assembly to insert into the whole sand grain inside the gathering cover;

[0023] S3. The sand particles are gathered around the gathering cover by the gathering cover rotating in the opposite direction to the tool.

[0024] S4. When multiple drive columns rotate with the gathering cover, the drive columns drive the lifting cap at the top of the main rod to rise. The raised lifting cap brings the whole sand grains closer to the bottom of the tool to be ground. The gap between the lifting cap and the side wall of the gathering cover discharges fine powdery sand. At the same time, the angular velocity difference between the stationary lifting cap and the rotating gathering cover disturbs the sand, forming a separation between the whole sand and the fine powdery sand.

[0025] Based on the above description, the beneficial effects of the present invention compared with the prior art are as follows:

[0026] As multiple drive columns rotate with the gathering shroud, the drive columns drive the lifting cap at the top of the main rod to rise. The rising lifting cap brings the intact abrasive grains closer to the bottom of the tool to be ground. At the same time, the angular velocity difference between the stationary lifting cap and the rotating gathering shroud disturbs the abrasive grains, forming a separation between intact abrasive grains and fine powdery abrasive grains. The gap between the lifting cap and the side wall of the gathering shroud always allows for the discharge of fine powdery abrasive grains, but the diameter of this gap is smaller than the diameter of the abrasive grains, thus preventing the intact abrasive grains from falling off. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a perspective view of the overall structure of the present invention;

[0029] Figure 2 This is a partial cross-sectional perspective view of the present invention;

[0030] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0031] Figure 4 This is a partial sectional front view of the lifting assembly of the present invention;

[0032] Figure 5 This is a perspective view of the rotating fixing assembly of the present invention;

[0033] Figure 6 This is a three-dimensional structural view of the aggregation component of the present invention;

[0034] Figure 7 This is a cross-sectional perspective view of the lifting component of the present invention;

[0035] Figure 8 This is one of the cross-sectional front views of the lifting component of the present invention;

[0036] Figure 9 This is a cross-sectional perspective view of the lifting component of the present invention in an inverted state;

[0037] Figure 10 This is a second sectional front view of the lifting component of the present invention;

[0038] Figure 11 This is a cross-sectional view showing the height position of the main rod before and after being lifted by the driving column, according to the present invention.

[0039] The meanings of the labels in the diagram are as follows:

[0040] 100. Base; 110. Sand basin; 120. Mounting platform;

[0041] 200. Lifting assembly; 210. Lifting platform; 220. Guide rod; 230. Hydraulic rod;

[0042] 300. Rotating and fixing assembly; 310. Rotating shaft; 320. Clamping jaws; 330. Fixing bolts;

[0043] 400. Gathering assembly; 410. Gathering cover; 411. Drive gear; 412. Driven gear; 420. Guide slope; 421. Feed hole; 422. Baffle plate;

[0044] 500, Lifting assembly; 510, Main rod; 520, Lifting plate; 530, Drive column; 540, Limit bolt; 550, Lifting cap; 560, Card. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] Example 1: Existing dulling devices for twist drills use a gathering shroud around the twist drill to collect abrasive particles. However, the gathering effect of the shroud is only distributed around the circumference of the twist drill. This is because it relies on the centrifugal force of the twist drill during high-speed rotation, which generates friction on the abrasive particles, and the particles then exert a reaction force on the sidewall of the twist drill. However, since the abrasive particles at the bottom of the twist drill are subjected to downward gravity, they cannot exert upward pressure on the top of the abrasive particles and the burrs at the bottom of the twist drill. Furthermore, the abrasive particles inside the gathering shroud are ground into fine powder due to the strong friction of the twist drill, and cannot be promptly removed from the gathering shroud during grinding. Therefore, it is difficult to effectively grind the bottom and surrounding areas of the twist drill.

[0047] Please see Figures 1-3The purpose of this embodiment is to provide a device for passivating micro-defects on the cutting edge before tool coating, including a base 100 and a sand basin 110 disposed on the top of the base 100. The sand basin 110 is provided with a plurality of gathering components 400, and the gathering components 400 include a gathering cover 410 that can rotate.

[0048] The gathering cover 410 is a hollow structure with an open top, used to pass through and blunt the rotation of the tool, and the rotation direction of the tool is opposite to the rotation direction of the gathering cover 410. After the tool is inserted into the gathering cover 410, the tool and the gathering cover 410 start to rotate in opposite directions. The grinding force on the cutting edge of the tool is provided by the sum of the rotation speeds of the gathering cover 410 and the tool. Compared with the two cases where the gathering cover 410 is stationary and the gathering cover 410 rotates in the same direction as the tool, the gathering cover 410 rotates in the opposite direction to the tool in this application, which can improve the grinding efficiency of the burrs on the cutting edge of the tool.

[0049] A lifting assembly 500 is provided near the bottom of the inner cavity of the gathering cover 410. The lifting assembly 500 includes:

[0050] The main rod 510 is slidably connected to the bottom of the sand basin 110. When the main rod 510 rises due to disturbance at the bottom, it drives the sand to rise and approach the bottom of the tool, increasing the normal pressure between the sand and the tool. According to the friction formula, under the premise of keeping the friction coefficient constant, the greater the normal pressure of the sand on the bottom of the tool, the greater the friction between the sand and the tool, and thus the higher the passivation grinding efficiency of the tool.

[0051] The lifting cap 550, with its edge forming a feeding gap with the inner wall of the gathering cover 410, allows only fine powdery sand particles to pass through. It remains stationary on the horizontal plane, and the angular velocity difference between it and the gathering cover 410 creates a disturbance to the sand and gravel. It moves up and down synchronously with the main rod 510, intermittently squeezing the sand particles to contact the bottom of the twist drill. Since the friction and gravity between the fine powdery sand and the intact sand and the lifting cap 550 are different, the fine powdery sand particles gradually fall to the bottom layer, while the intact sand particles are located in the upper layer. That is, the sand and gravel after screening maintains a larger particle size at the top and a smaller particle size at the bottom.

[0052] The edge and the inner wall of the gathering cover 410 form a feeding gap that allows only fine powdery sand particles to pass through. It remains stationary on the horizontal plane, and the angular velocity difference between it and the gathering cover 410 causes disturbance to the sand and gravel.

[0053] like Figure 4 As shown, a mounting platform 120 is provided above the sand basin 110, and a lifting assembly 200 is provided at the bottom of the mounting platform 120. The lifting assembly 200 includes a hydraulic rod 230 and a lifting platform 210 for mounting multiple rotating and fixed assemblies 300. The cylinder of the hydraulic rod 230 is fixedly connected to the mounting platform 120, and the piston end of the hydraulic rod 230 is fixedly connected to the lifting platform 210.

[0054] The improvement is that the top of the lifting platform 210 is fixedly connected with multiple guide rods 220, and the multiple guide rods 220 are slidably connected to the mounting platform 120 to maintain the stability of the multiple rotating fixed components 300 in their own circumferential direction when they are working.

[0055] During implementation, multiple rotating and fixing components 300 are installed at the bottom of the lifting platform 210. Each of these components holds a twist drill bit to be ground. When the piston end of the hydraulic rod 230 moves the lifting platform 210 downwards, extending the cutting edge of the tool into the gathering cover 410, the rotating and fixing components 300 need to drive the tool to rotate. The friction between the cutting edge and the abrasive grains removes the burrs from the cutting edge. Consequently, the tool inevitably vibrates in the circumferential direction due to the reaction force of the abrasive grains, affecting the accuracy of the tool's cutting edge dulling. The guide rod 220 restricts the horizontal swing of the lifting platform 210, thus absorbing the instability of the tool during the dulling process.

[0056] exist Figure 5 In the middle, the lower part of the lifting platform 210 is connected to multiple rotating and fixing components 300. The rotating and fixing components 300 include a rotating shaft 310 that is rotatably connected to the lifting platform 210. The bottom of the rotating shaft 310 is integrally connected to multiple grippers 320 for fixing the tool. The multiple grippers 320 are arranged in a ring array, and the periphery of the multiple grippers 320 is threaded with fixing bolts 330.

[0057] The rotating shaft 310 and the gathering cover 410 rotate in opposite directions. The rotating shaft is driven by a motor, the stator of which is fixedly connected to the lifting platform 210, and the rotor of which is coaxially connected to the rotating shaft 310. When the twist drill rotates at high speed, assuming clockwise rotation, its surface spiral grooves will generate clockwise friction on the contacting sand particles. If the sand particles are only subjected to this force, they are prone to rotating synchronously with the drill bit, i.e., "slipping," and it is difficult for them to enter the cutting zone of the tool. When the gathering cover 410 rotates clockwise, its inner wall generates counterclockwise friction on the sand particles. The two opposing frictional forces form a shearing force, forcing the sand particles to move along the spiral trajectory towards the center of the tool, i.e., the axis area where the cutting edge is located, in a balance between "clockwise dragging" and "counterclockwise blocking," rather than spinning idly with the tool or the gathering cover 410. For coarse sand with a larger particle size, this shearing force can "correct" its direction of movement, ensuring that the sand particles can accurately enter the cutting range of the tool.

[0058] It should be noted that before grinding, the twist drill is inserted into multiple jaws 320 at its tip, and then the fixing bolt 330 is rotated downwards along the surface of the multiple jaws 320, thereby fixing the twist drill cutter that needs to be blunted inside the jaws 320. After the hydraulic rod 230 drives the lifting platform 210 to extend the cutter into the gathering cover 410, the power to the drive motor of the rotating shaft 310 is turned on, causing the twist drill to rotate in the abrasive grains inside the gathering cover 410, using the friction of the abrasive grains to remove burrs from the cutting edge of the cutter.

[0059] Next, through Figure 6 The specific structure of the gathering component 400 is disclosed. The gathering cover 410 is rotatably connected to the fixed cover on the top of the sand basin 110. A driven gear 412 is integrally provided on the outer periphery of the part of the gathering cover 410 above the fixed cover of the sand basin 110. A driving gear 411 is meshed on one side of the driven gear 412. The driving gear 411 is rotatably connected to the fixed cover of the sand basin 110.

[0060] Furthermore, the periphery of the gathering cover 410 is provided with a guide slope 420 for driving the sand particles in the sand basin 110 to rise. The side wall of the gathering cover 410 has multiple feed holes 421 at the top of the highest point of the guide slope 420. Each feed hole 421 has a baffle plate 422 at its edge for guiding the sand particles into the interior of the gathering cover 410.

[0061] In other words, after the twist drill is inserted into the gathering cover 410 and begins to rotate, the power supply of the motor that drives the drive gear 411 to rotate is turned on. The drive gear 411 drives the gathering cover 410 to rotate in the opposite direction to the twist drill through the driven gear 412 that meshes with it. Since the gathering cover 410 and the baffle plate 422 are both integrally set with the gathering cover 410, the guide slope 420 gradually guides the complete sand particles located at the bottom of the sand basin 110 upward, while the fine powder that has been ground cannot be guided to rise by the guide slope 420 due to insufficient friction. At the same time, the rotating baffle plate 422 guides the complete sand particles around the feed hole 421 into the interior of the gathering cover 410.

[0062] Based on the above explanation, the following will further combine... Figures 7-11 To explain the preferred effect of the lifting component 500, the lifting component 500 includes multiple drive columns 530 fixedly connected to the inner wall of the gathering cover 410, and multiple limit bolts 540 fixedly connected to the bottom of the main rod 510. Each limit bolt 540 is arranged in a ring array about the axis of the main rod 510, and the multiple limit bolts 540 are spaced apart. The height of the bottom of the limit bolt 540 is lower than the height of the top of the drive column 530.

[0063] Furthermore, the limiting bolt 540 is fan-shaped to extend the time it takes for the main rod 510 to be lifted by the driving column 530, the lifting cap 550 has a diameter larger than the diameter of the main rod 510, and the bottom of the main rod 510 is provided with a lifting plate 520 with a diameter larger than itself.

[0064] During operation, the main rod 510 and the lifting plate 520 have an overall longitudinal cross-section in the shape of a cross. A connecting rod is slidably connected to the bottom of the sand basin 110 at the bottom of the lifting plate 520. The cross-section of the connecting rod is non-circular, such as a regular hexagon, and a clip 560 is fixedly installed at the lower part of the connecting rod. The cross-section of the clip 560 is larger than that of the connecting rod. The clip 560 limits the vertical height of the connecting rod within the sand basin 110, preventing the main rod 510 from sliding downwards along the axial direction of the gathering cover 410 under its own weight. Specifically, when the drive column 530 is between two adjacent limiting bolts 540, the bottom of the clip 560 is tightly against the inner bottom wall of the sand basin 110.

[0065] Once the gathering cover 410 begins to rotate, multiple drive columns 530 continuously pass under the lifting plate 520, thereby continuously driving the main rod 510 to reciprocate up and down. The specific process is as follows:

[0066] When the drive column 530 moves synchronously with the gathering cover 410, it first contacts the arc-shaped portion at the end of the limit bolt 540. As the drive column 530 continues to rotate, the arc-shaped portion of the limit bolt 540 converts the horizontal driving pressure of the drive column 530 into a vertically upward lifting driving force on the limit bolt 540, thereby raising the height of the lifting plate 520. Since the main rod 510 is integrally connected to the lifting plate 520 and the limit bolt 540, it is first lifted by the drive column 530. This causes the sand particles on the top of the lifting cap 550 to move towards the bottom of the tool, creating a compressive force between the sand particles and the bottom of the tool's cutting edge. Simultaneously, the lifting distance of the main rod 510 prevents the lifting cap 550 from contacting the bottom of the tool, thus preventing damage to the lifting cap 550. The interaction force between the sand particles and the bottom of the tool enhances the passivation effect on the bottom of the tool's cutting edge.

[0067] Continue reading Figure 8 Because a material discharge gap is formed between the lifting cap 550 and the inner wall of the gathering cover 410, and the diameter of the fine powder gravel is less than the width of the material discharge gap and the diameter of the intact gravel, the lifting cap 550 moves up and down with the main rod 510, and the angular velocity of the lifting cap 550 is zero, there is an angular velocity difference between it and the rotating gathering cover 410. This causes disturbance to the gravel (including both fine powder and intact parts) at the top of the lifting cap 550. The friction and gravity between the fine powder gravel and the intact gravel and the lifting cap 550 are different, so the fine powder gravel gradually falls to the bottom layer, while the intact gravel is located at the top layer. Thus, the fine powder gravel continuously falls from the material discharge gap to the bottom of the gathering cover 410. The bottom of the gathering cover 410 is connected to the gravel in the sand basin 110, so the fine powder is discharged to the bottom of the sand basin 110.

[0068] What needs to be made public is that Figure 11 L1, L2 and L3 are all horizontal lines. The drive column 530 is cylindrical in shape. The end of each limit bolt 540 that contacts the drive column 530 is an arc surface, so that each drive column 530 can smoothly bounce between each limit bolt 540.

[0069] Example 2: This example, based on the content provided in Example 1, aims to provide a passivation method for a tool before coating to passivate micro-defects on the cutting edge. The specific steps are as follows:

[0070] S1. Fix the tool to be sharpened to the bottom of the rotating fixing assembly 300;

[0071] S2. The cutting edge of the tool is driven by the lifting component 200 to insert into the whole sand grain inside the gathering cover 410;

[0072] S3. The sand particles are gathered around the gathering cover 410 by the gathering cover 410 rotating in the opposite direction to the cutter.

[0073] S4. When multiple drive columns 530 rotate with the gathering cover 410, the drive columns 530 drive the lifting cap 550 at the top of the main rod 510 to rise. The raised lifting cap 550 drives the whole sand grains to approach the bottom of the tool to be ground. The gap between the lifting cap 550 and the side wall of the gathering cover 410 discharges fine powdery sand. At the same time, the angular velocity difference between the stationary lifting cap 550 and the rotating gathering cover 410 disturbs the sand, forming a separation between the whole sand and the fine powdery sand.

[0074] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for passivating micro-defects on the cutting edge before coating a cutting tool, comprising a base (100) and a sand basin (110) disposed on the top of the base (100), wherein the sand basin (110) is provided with a plurality of gathering components (400), characterized in that: The gathering assembly (400) includes a self-rotating gathering cover (410). The gathering cover (410) is a hollow structure with an opening at the top, used to pass through the tool rotation blunting, and the tool rotation direction is opposite to the rotation direction of the gathering cover (410); A lifting assembly (500) is provided near the bottom of the inner cavity of the gathering cover (410). The lifting assembly (500) includes: The main rod (510) is slidably connected to the bottom of the sand basin (110); The lifting cap (550) forms a feeding gap with the inner wall of the gathering cover (410) that allows only fine powdery sand particles to pass through. It remains stationary on the horizontal plane and the angular velocity difference between it and the gathering cover (410) creates a disturbance to the sand and gravel. It moves up and down synchronously with the main rod (510) to intermittently squeeze the sand particles to contact the bottom of the twist drill. The lifting assembly (500) includes a plurality of drive columns (530) fixedly connected to the inner wall of the gathering cover (410). A plurality of limit bolts (540) are fixedly connected to the bottom of the main rod (510). Each limit bolt (540) is arranged in a ring array about the axis of the main rod (510), and the plurality of limit bolts (540) are spaced apart. The height of the bottom of the limit bolt (540) is lower than the height of the top of the drive column (530). The limiting bolt (540) is fan-shaped to extend the time for the main rod (510) to be raised by the driving column (530). The diameter of the lifting cap (550) is larger than the diameter of the main rod (510). The bottom of the main rod (510) is provided with a lifting plate (520) with a diameter larger than itself.

2. The tool passivation device for micro-defects on the cutting edge before coating according to claim 1, characterized in that: The sand basin (110) is provided with an installation platform (120) above it. The bottom of the installation platform (120) is provided with a lifting assembly (200). The lifting assembly (200) includes a hydraulic rod (230) and a lifting platform (210). The cylinder of the hydraulic rod (230) is fixedly connected to the installation platform (120), and the piston end of the hydraulic rod (230) is fixedly connected to the lifting platform (210).

3. The tool passivation device for micro-defects on the cutting edge before coating according to claim 2, characterized in that: The top of the lifting platform (210) is fixedly connected to multiple guide rods (220), and the multiple guide rods (220) are slidably connected to the mounting platform (120).

4. The tool passivation device for micro-defects on the cutting edge before coating according to claim 2, characterized in that: The lower part of the lifting platform (210) is connected to a plurality of rotating fixing components (300). The rotating fixing components (300) include a rotating shaft (310) that is rotatably connected to the lifting platform (210). The bottom of the rotating shaft (310) is integrally connected to a plurality of grippers (320) for fixing the cutting tool. The plurality of grippers (320) are arranged in a ring array. The periphery of the plurality of grippers (320) is threaded with fixing bolts (330).

5. The tool passivation device for micro-defects on the cutting edge before coating according to claim 4, characterized in that: The rotating shaft (310) and the gathering cover (410) rotate in opposite directions.

6. The tool passivation device for micro-defects on the cutting edge before coating according to claim 1, characterized in that: The gathering cover (410) is rotatably connected to the fixed cover on the top of the sand basin (110). A driven gear (412) is integrally provided on the outer periphery of the part of the gathering cover (410) above the fixed cover of the sand basin (110). A driving gear (411) meshes with one side of the driven gear (412). The driving gear (411) is rotatably connected to the fixed cover of the sand basin (110).

7. The tool passivation device for micro-defects on the cutting edge before coating according to claim 6, characterized in that: The periphery of the gathering cover (410) is provided with a guide slope (420) for driving the sand particles in the sand basin (110) to rise. The side wall of the gathering cover (410) has multiple feed holes (421) at the top of the highest point of the guide slope (420). Each feed hole (421) has a baffle plate (422) at its edge for guiding the sand particles into the interior of the gathering cover (410).

8. A passivation method for a tool before coating to passivate micro-defects on the cutting edge, as described in any one of claims 1-7, characterized in that: Includes the following steps: S1. Fix the tool to be sharpened to the bottom of the rotating fixing assembly (300); S2. The cutting edge of the tool is driven by the lifting assembly (200) to insert into the whole sand grain inside the gathering cover (410); S3. The sand particles are gathered around the gathering cover (410) by the gathering cover (410) rotating in the opposite direction to the cutting tool; S4. When multiple drive columns (530) rotate with the gathering cover (410), the drive columns (530) drive the lifting cap (550) at the top of the main rod (510) to rise. The raised lifting cap (550) drives the whole sand grains to approach the bottom of the tool to be ground. The gap between the lifting cap (550) and the side wall of the gathering cover (410) discharges fine powdery sand. At the same time, the angular velocity difference between the stationary lifting cap (550) and the rotating gathering cover (410) disturbs the sand, forming the separation of whole sand and fine powdery sand.

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