Device and method for passivating microdefects of cutting edge before cutter coating

Abstract

The invention relates to the technical field of finishing grinding devices, in particular to a device and method for passivating microdefects of a cutting edge before cutter coating. The grinding device comprises a sand basin fixedly arranged at the top of a base, sand grains used for grinding the twist drill-shaped cutter are contained in the sand basin, a plurality of gathering assemblies used for gathering the sand grains are arranged in the sand basin, and each gathering assembly comprises a gathering cover capable of rotating; when the multiple driving columns rotate along with the gathering cover, the driving columns drive the lifting cap at the top of the main rod to ascend, the lifted lifting cap drives complete sand grains to get close to the bottom of a tool to be polished, meanwhile, the angular velocity difference between the static lifting cap and the rotating gathering cover disturbs gravel, and complete gravel and fine powder gravel are separated; the gap between the lifting cap and the side wall of the gathering cover always keeps discharging the fine powdery gravels, but the diameter of the gap is smaller than that of the gravels, so that the complete gravels are prevented from falling off.

Description

Technical Field

[0001] The invention relates to the technical field of finishing grinding devices, in particular to a device and method for passivating microscopic defects on a cutting edge before tool coating. Background Art

[0002] Before coating, twist drills are edge-passivated with agitated walnut sand. This sand primarily removes burrs and dulls the blade edge. Walnut sand is relatively brittle and quickly breaks into a fine powder after continuous impact and friction with the high-speed rotating tool. This fine powder cannot effectively cut the tool surface, resulting in reduced grinding efficiency. The high-speed rotation of the tool creates a "ring vortex" around the sand particles, which displaces them from the tool and creates localized "sand voids" (particularly at the top of the spiral groove), leading to insufficient grinding in that area.

[0003] To address this issue, existing passivation devices incorporate a gathering hood around the twist drill to gather sand particles around it. However, the gathering hood's effect is limited to the circumference of the twist drill, relying on the centrifugal force of the twist drill during high-speed rotation to create friction with the sand particles, which in turn creates a reaction force on the drill's sidewalls. However, the grit at the bottom of the twist drill is subject to downward gravity, preventing it from exerting upward pressure on the top of the grit and the burrs at the bottom of the drill. Furthermore, the sand particles within the gathering hood are ground into a fine powder by the intense friction of the twist drill, making it impossible to remove the gathering hood in time during the grinding process, making it difficult to effectively polish the bottom and surrounding areas of the twist drill.

[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 existing technology. Summary of the Invention

[0005] One of the purposes of the present invention is to provide a device for passivating microscopic defects on the cutting edge before tool coating, which solves the problem that burrs on the bottom of the twist drill are more likely to form a vacuum area due to its rotation, and sand particles inside the gathering cover will be ground into fine powder due to the strong friction of the twist drill, making it difficult to effectively grind the bottom and surrounding areas of the twist drill.

[0006] To achieve the above purpose, the device for passivating cutting edge micro defects before tool coating comprises a base and a sand basin arranged on the top of the base, wherein a plurality of gathering components are arranged in the sand basin, and the gathering components include a gathering cover capable of self-rotation; The gathering cover is a hollow structure with an opening at the top, which is used to insert the tool for rotation passivation, and the tool rotation direction is opposite to that of the gathering cover; the grinding force on the cutting edge of the tool is provided by the sum of the rotation speeds of the gathering cover and the tool. Compared with the two situations where the gathering cover remains stationary and the gathering cover and the tool rotate in the same direction, the gathering cover rotates in the opposite direction to the tool, which can improve the grinding efficiency of the burrs on the cutting edge of the tool A lifting assembly is provided near the bottom of the inner cavity of the gathering cover, and the lifting assembly includes: The main rod is connected to the bottom of the sand basin by sliding up and down; when the main rod rises due to the disturbance of the bottom, it drives the gravel to rise and approach the bottom of the tool, increasing the positive pressure between the gravel and the tool. According to the friction formula, under the premise of keeping the friction coefficient unchanged, the greater the positive pressure of the gravel on the bottom of the tool, the greater the friction between the gravel and the tool, and thus the higher the passivation grinding efficiency of the tool. The lifting cap, its edge and the inner wall of the gathering cover form a feeding gap that only allows fine powdered sand particles to pass through. It remains stationary on the horizontal plane and the angular velocity difference between it and the gathering cover forms a disturbance to the gravel. It moves up and down synchronously with the main rod to intermittently squeeze the sand particles to contact the bottom of the twist drill. Since the friction and gravity between the fine powdered sand particles and the complete sand particles and the lifting cap are different, the fine powdered sand particles gradually fall to the bottom layer, while the complete sand particles are located in the upper layer, that is, the gravel after screening maintains a larger particle size at the top and smaller at the bottom.

[0007] The edge and the inner wall of the gathering hood form a feeding gap for only fine powdered sand to pass through. It remains stationary on the horizontal plane and the angular velocity difference between it and the gathering hood causes disturbance to the sand.

[0008] In the above technical solution, a mounting platform is provided above the sand basin, and a lifting assembly is provided at the bottom of the mounting platform. The lifting assembly includes a hydraulic rod and a lifting platform for installing multiple rotating fixed assemblies. The cylinder body of the hydraulic rod is fixedly connected to the mounting platform, and the piston end of the hydraulic rod is fixedly connected to the lifting platform.

[0009] A plurality of guide rods are fixedly connected to the top of the lifting platform, and the plurality of guide rods are all slidably connected to the mounting platform, so as to maintain their circumferential stability when the plurality of rotating and fixing components are working.

[0010] In another technical solution, a plurality of rotating fixing components are plugged into the lower part of the lifting platform, and the rotating fixing components include a rotating shaft rotatably connected to the lifting platform. The bottom of the rotating shaft is integrally connected with a plurality of clamps for fixing the tool, and the plurality of clamps are distributed in a circular array, and the outer periphery of the plurality of clamps is threadedly connected with fixing bolts.

[0011] The rotating shaft and the gathering hood rotate in opposite directions. When the twist drill rotates at high speed, assuming it rotates clockwise, the spiral grooves on its surface will generate a clockwise friction force on the sand particles in contact. If the sand particles are only subjected to this force, they will easily rotate synchronously with the drill bit, that is, "slip", and have difficulty entering the tool cutting area. When the gathering hood rotates clockwise, its inner wall generates a counterclockwise friction force on the sand particles - the two opposing friction forces form a shear force, forcing the sand particles to move along a spiral trajectory toward the center of the tool, that is, the axial area where the cutting edge is located, in a balance between "clockwise drag" and "counterclockwise obstruction", rather than idling with the tool or the gathering hood. For coarse sand with larger particle size, this shear force can "correct" its direction of movement, ensuring that the sand particles can accurately enter the tool cutting range.

[0012] Based on the above solution, 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 top of the gathering cover located above the fixed cover of the sand basin. A driving gear is engaged with one side of the driven gear, and the driving gear is rotatably connected to the fixed cover of the sand basin.

[0013] Furthermore, a guide slope is provided on the periphery of the gathering cover for driving the sand particles in the sand basin to rise, and a plurality of feed holes are opened on the top of the highest point of the guide slope on the side wall of the gathering cover, and a baffle plate is provided on the edge of each feed hole for guiding the sand particles to enter the interior of the gathering cover.

[0014] In the above scheme, the lifting assembly includes a plurality of driving columns fixedly connected to the inner wall of the gathering cover, and a plurality of limit bolts are fixedly connected to the bottom of the main rod. Each of the limit bolts is distributed in a circular array about the axis of the main rod, and the plurality of limit bolts are arranged at intervals, and the height of the bottom of the limit bolt is lower than the height of the top of the driving column.

[0015] Furthermore, the limit bolt is fan-shaped and is used to extend the time 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.

[0016] A second object of the present invention is to provide a passivation method for a device for passivating microscopic defects on a cutting edge before coating a tool, comprising the following steps: S1. Fix the tool to be sharpened on the bottom of the rotating fixed component; S2, driving the cutting edge of the tool through the lifting assembly to insert into the complete sand grains in the gathering cover; S3, gathering the sand particles around the gathering cover by means of a gathering cover that rotates in the opposite direction to the cutter; S4. When multiple driving columns rotate with the gathering cover, the driving columns drive the lifting cap on the top of the main rod to rise. The lifted lifting cap drives the complete sand grains to approach the bottom of the tool to be polished, and the gap between the lifting cap and the side wall of the gathering cover discharges fine powdered gravel. At the same time, the angular velocity difference between the stationary lifting cap and the rotating gathering cover disturbs the gravel, forming a separation between the complete gravel and the fine powdered gravel.

[0017] Based on the above description, it can be seen that compared with the prior art, the beneficial effects of the present invention are: When multiple driving columns rotate following the gathering cover, the driving columns drive the lifting cap on the top of the main rod to rise, and the lifted lifting cap drives the complete sand grains to approach the bottom of the tool to be polished. At the same time, the angular velocity difference between the stationary lifting cap and the rotating gathering cover disturbs the gravel, forming a separation between the complete gravel and the fine powder gravel. The gap between the lifting cap and the side wall of the gathering cover always keeps the fine powder gravel discharged, but the diameter of the gap is smaller than the diameter of the gravel, thereby preventing the complete gravel from falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a three-dimensional diagram of the overall structure of the present invention; Figure 2 It is a partially cutaway perspective view of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 A partially cutaway front view of the lifting assembly of the present invention; Figure 5 A structural perspective view of the rotating fixing assembly of the present invention; Figure 6 A structural perspective diagram of the gathering assembly of the present invention; Figure 7 is a cutaway perspective view of a lifting assembly of the present invention; Figure 8 is one of the cutaway front views of the lifting assembly of the present invention; Figure 9 A cutaway perspective view of the lifting assembly of the present invention in an inverted state; Figure 10 The second cross-sectional front view of the lifting assembly of the present invention; Figure 11 This is a cross-sectional view of the height position relationship of the main rod of the present invention before and after the driven column is lifted.

[0019] The meaning of each number in the figure is: 100, base; 110, sand basin; 120, mounting table; 200, lifting assembly; 210, lifting platform; 220, guide rod; 230, hydraulic rod; 300, rotating fixing assembly; 310, rotating shaft; 320, clamping claw; 330, fixing bolt; 400, gathering assembly; 410, gathering cover; 411, driving gear; 412, driven gear; 420, guide slope; 421, feed hole; 422, baffle plate; 500, lifting assembly; 510, main rod; 520, lifting plate; 530, driving column; 540, limit bolt; 550, lifting cap; 560, card. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] Example 1: Existing twist drill tool passivation devices incorporate a gathering hood around the twist drill to gather sand particles around it. However, the gathering hood's gathering effect is limited to the circumference of the twist drill, relying on the centrifugal force of the twist drill during high-speed rotation to create friction with the sand particles, which in turn generates a reaction force against the drill's sidewalls. However, the grit at the bottom of the twist drill is subject to downward gravity, preventing it from exerting upward pressure on the top of the grit and the burrs at the bottom of the drill. Furthermore, the sand particles within the gathering hood are ground into a fine powder due to the intense friction of the twist drill. This hood cannot be removed promptly during the grinding process, making it difficult to effectively polish the bottom and surrounding areas of the twist drill.

[0022] See also Figure 1-Figure 3 The present embodiment aims to provide a device for passivating microscopic defects on a cutting edge before coating a tool, comprising a base 100 and a sand basin 110 disposed on top of the base 100. The sand basin 110 is provided with a plurality of gathering assemblies 400, and the gathering assemblies 400 include a gathering cover 410 capable of self-rotation. The gathering cover 410 is a hollow structure with an opening at the top, which is used to insert a tool for rotation and passivation, and the direction of rotation of the tool is opposite to that of the gathering cover 410; when the tool is inserted into the gathering cover 410, the tool and the gathering cover 410 start to rotate in opposite directions, and 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 situations where the gathering cover 410 remains stationary and the gathering cover 410 rotates in the same direction as the tool, in this application, the gathering cover 410 rotates in the opposite direction to the tool, which can improve the grinding efficiency of burrs on the cutting edge of the tool.

[0023] 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 connected to the bottom of the sand basin 110 for vertical sliding. When the main rod 510 rises due to the disturbance at the bottom, it drives the gravel to rise and approach the bottom of the tool, thereby increasing the positive pressure between the gravel and the tool. From the friction formula, it can be seen that, under the premise of keeping the friction coefficient unchanged, the greater the positive pressure of the gravel on the bottom of the tool, the greater the friction between the gravel and the tool, and thus the higher the passivation grinding efficiency of the tool.

[0024] The lifting cap 550, with its edge and the inner wall of the gathering cover 410, forms a feeding gap for only fine powdered sand particles to pass through. The lifting cap 550 remains stationary on the horizontal plane and the angular velocity difference between the lifting cap 550 and the gathering cover 410 causes disturbance to the sand particles, which moves up and down synchronously with the main rod 510 to intermittently squeeze the sand particles to contact the bottom of the twist drill. Since the friction and gravity between the fine powdered sand particles and the intact sand particles and the lifting cap 550 are different, the fine powdered sand particles gradually fall to the bottom layer, while the intact sand particles are located in the upper layer, that is, the sand particles after screening maintain a larger particle size at the top and smaller at the bottom.

[0025] The edge and the inner wall of the gathering cover 410 form a feeding gap for only fine powdered sand particles to pass through, which remains stationary on the horizontal plane and the angular velocity difference between the edge and the gathering cover 410 causes disturbance to the sand particles.

[0026] 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 installing multiple rotating fixed assemblies 300. The cylinder body 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.

[0027] The improvement is that a plurality of guide rods 220 are fixedly connected to the top of the lifting platform 210, and the plurality of guide rods 220 are all slidably connected to the mounting platform 120, so as to maintain their circumferential stability when the plurality of rotating fixing components 300 are working.

[0028] During implementation, since multiple rotating and fixing assemblies 300 are installed at the bottom of the lifting platform 210, each of which is fixed with a twist drill-shaped tool to be sharpened, when the piston end of the hydraulic rod 230 drives the lifting platform 210 downward, extending the tool cutting edge into the gathering cover 410, the rotating and fixing assemblies 300 need to drive the tool to rotate, and the friction between the tool cutting edge and the sand grains removes burrs on the cutting edge. As a result, the tool will inevitably vibrate circumferentially due to the reaction force of the sand grains, which will affect the accuracy of the tool cutting edge passivation. The provision of the guide rod 220 limits the horizontal swing of the lifting platform 210, thereby absorbing the instability of the tool during the passivation process.

[0029] exist Figure 5 In the figure, a plurality of rotating fixing components 300 are plugged into the lower part of the lifting platform 210. The rotating fixing components 300 include a rotating shaft 310 rotatably connected to the lifting platform 210. The bottom of the rotating shaft 310 is integrally connected with a plurality of clamps 320 for fixing the tool. The plurality of clamps 320 are distributed in a circular array, and the outer periphery of the plurality of clamps 320 is threadedly connected with fixing bolts 330.

[0030] The rotating shaft 310 and the gathering hood 410 rotate in opposite directions. The rotating shaft is driven by a motor, whose stator is fixedly connected to the lifting platform 210 and whose rotor is coaxially connected to the rotating shaft 310. When the twist drill rotates at high speed, assuming it rotates clockwise, the spiral grooves on its surface will generate a clockwise friction force on the sand particles in contact. If the sand particles were only subjected to this force, they would tend to rotate synchronously with the drill bit, i.e., "slip," making it difficult for them to enter the tool's cutting zone. When the gathering hood 410 rotates counterclockwise, its inner wall generates a counterclockwise friction force on the sand particles. These two opposing friction forces form a shear force, forcing the sand particles to move along a spiral trajectory toward the center of the tool (i.e., the axis where the cutting edge is located) in a balance between "clockwise drag" and "counterclockwise resistance," rather than idling with the tool or gathering hood 410. For coarse sand with larger particle sizes, this shear force can "correct" its direction of movement, ensuring that the sand particles precisely enter the tool's cutting range.

[0031] It should be noted that before sharpening, the twist drill is inserted into the plurality of jaws 320, and then the fixing bolts 330 are rotated downward along the surfaces of the plurality of jaws 320, thereby securing the twist drill-shaped tool to be passivated within the jaws 320. After the hydraulic rod 230 drives the lifting platform 210 to extend the tool into the gathering cover 410, the power supply of the drive motor of the rotating shaft 310 is turned on, causing the twist drill to rotate in the sand grains within the gathering cover 410, utilizing the friction of the sand grains to remove burrs from the tool's cutting edge.

[0032] Next, through Figure 6The specific structure of the gathering assembly 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 top of the gathering cover 410 located above the fixed cover of the sand basin 110. A driving gear 411 is engaged with one side of the driven gear 412, and the driving gear 411 is rotatably connected to the fixed cover of the sand basin 110.

[0033] Furthermore, a guide slope 420 is provided on the periphery of the gathering cover 410 for driving the sand particles in the sand basin 110 to rise, and a plurality of feed holes 421 are opened on the top of the highest point of the guide slope 420 on the side wall of the gathering cover 410, and a baffle plate 422 is provided on the edge of each feed hole 421 for guiding the sand particles to enter the interior of the gathering cover 410.

[0034] That is to say, after the twist drill is inserted into the gathering cover 410 and starts to rotate, the power of the motor that drives the driving gear 411 is turned on, and the driving gear 411 drives the gathering cover 410 and the twist drill to rotate in the opposite direction through the driven gear 412 meshing therewith. Since the gathering cover 410 and the baffle plate 422 are both integrated with the gathering cover 410, the guide slope 420 gradually guides the complete sand grains at the bottom of the sand basin 110 upward, while the ground fine powder cannot be guided upward by the guide slope 420 due to insufficient friction. At the same time, the rotating baffle plate 422 guides the complete sand grains around the feed hole 421 into the interior of the gathering cover 410.

[0035] Based on the above description, Figure 7-11 To explain the preferred effect of the lifting assembly 500, the lifting assembly 500 includes a plurality of driving columns 530 fixedly connected to the inner wall of the gathering cover 410, and a plurality of limiting bolts 540 fixedly connected to the bottom of the main rod 510. Each limiting bolt 540 is distributed in a circular array about the axis of the main rod 510, and the plurality of limiting bolts 540 are arranged at intervals, and the height of the bottom of the limiting bolt 540 is lower than the height of the top of the driving column 530.

[0036] Furthermore, the limit bolt 540 is fan-shaped and is used to extend the time for the main rod 510 to be lifted by the driving column 530. The diameter of the lifting cap 550 is 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.

[0037] During operation, the main rod 510 and the lifting plate 520 have an overall longitudinal cross-section that forms a "cross" shape. A connecting rod slidably connected to the bottom of the sand basin 110 is provided at the bottom of the lifting plate 520. The connecting rod has a non-circular cross-section, such as a regular hexagon, and a clip 560 is fixedly provided at the bottom of the connecting rod. The clip 560 has a larger cross-section than 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 downward along the axial direction of the gathering cover 410 under the action of its own weight. Specifically, when the driving column 530 is between two adjacent limit pins 540, the bottom of the clip 560 is in close contact with the inner bottom wall of the sand basin 110.

[0038] When the gathering cover 410 starts to rotate, the plurality of driving columns 530 continuously pass through the bottom of the lifting plate 520, thereby continuously driving the main rod 510 to perform up and down reciprocating motion. The specific process is as follows: When the drive column 530 moves synchronously with the focusing cover 410, it first contacts the arc portion of the end of the stop pin 540. As the drive column 530 continues to rotate, the arc portion of the stop pin 540 converts the horizontal driving pressure exerted by the drive column 530 into a vertical upward lifting force on the stop pin 540, thereby driving the lifting plate 520 upward. Since the main rod 510 is integrally connected to the lifting plate 520 and the stop pin 540, it is first lifted by the drive column 530, driving the sand grains on the top of the lifting cap 550 toward the bottom of the tool, generating a compressive force between the sand grains and the bottom of the tool's cutting edge. At the same time, the distance the main rod 510 is lifted does not cause the lifting cap 550 to contact the bottom of the tool, preventing damage to the lifting cap 550. The interaction between the sand grains and the bottom of the tool enhances the passivation effect on the bottom of the tool's cutting edge.

[0039] Continue reading Figure 8 Since the lifting cap 550 and the inner wall of the gathering cover 410 form a feeding gap, and the diameter of the fine powder gravel is less than the width of the feeding gap and less than the diameter of the complete gravel, the lifting cap 550 follows the main rod 510 to make an up and down reciprocating motion, and the angular velocity of the lifting cap 550 is zero, there is an angular velocity difference with the rotating gathering cover 410, thereby disturbing the gravel (including fine powder and complete parts) on the top of the lifting cap 550, and the friction and gravity between the fine powder gravel and the complete gravel and the lifting cap 550 are different, so the fine powder sand particles gradually fall to the bottom layer, while the complete sand particles are located in the upper layer, so that the fine powder sand particles continue to fall from the feeding gap to the bottom of the gathering cover 410, and the bottom of the gathering cover 410 remains connected with the sand particles in the sand basin 110, so the fine powder will be discharged to the bottom of the sand basin 110.

[0040] What needs to be made public is that Figure 11L1, L2 and L3 are all horizontal lines, the shape of the driving column 530 is set to be cylindrical, and the position where the end of each limiting bolt 540 contacts the driving column 530 is set to be an arc surface, so that each driving column 530 can jump smoothly between each limiting bolt 540.

[0041] Example 2: This example is based on the content provided in Example 1, and aims to provide a passivation method for a device for passivating cutting edge micro defects before tool coating. The specific steps are as follows: S1. Fix the tool to be sharpened on the bottom of the rotating fixing assembly 300; S2, driving the cutting edge of the tool through the lifting assembly 200 to insert into the intact sand grains in 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 cutter; S4. When multiple driving columns 530 rotate following the gathering cover 410, the driving columns 530 drive the lifting cap 550 on the top of the main rod 510 to rise, and the lifted lifting cap 550 drives the complete sand grains to approach the bottom of the tool to be sharpened, and the gap between the lifting cap 550 and the side wall of the gathering cover 410 discharges fine powdered gravel. At the same time, the angular velocity difference between the stationary lifting cap 550 and the rotating gathering cover 410 disturbs the gravel, forming a separation between the complete gravel and the fine powdered gravel.

[0042] The above shows and describes 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 above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for passivating microscopic defects on a cutting edge before coating a tool, comprising a base (100) and a sand basin (110) arranged on top of the base (100), wherein a plurality of gathering components (400) are arranged in the sand basin (110), characterized in that: The gathering assembly (400) includes a gathering cover (410) capable of self-rotation; The gathering cover (410) is a hollow structure with an open top, used for inserting a tool for rotational passivation, and the direction of rotation of the tool is opposite to the direction of rotation of the gathering cover (410); A lifting assembly (500) is provided near the bottom of the inner cavity of the gathering cover (410), and the lifting assembly (500) includes: A main rod (510), the main rod (510) is slidably connected to the bottom of the sand basin (110) in an up-and-down manner; The lifting cap (550) forms a feeding gap with the inner wall of the gathering cover (410) for only fine powdered sand to pass through, and remains stationary on the horizontal plane. The angular velocity difference between the lifting cap (550) and the gathering cover (410) causes disturbance to the sand, and the lifting cap (550) moves up and down synchronously with the main rod (510) to intermittently squeeze the sand to contact the bottom of the twist drill.

2. The device for passivating cutting edge micro defects before tool coating according to claim 1, characterized in that: A mounting platform (120) is provided above the sand basin (110), a lifting assembly (200) is provided at the bottom of the mounting platform (120), the lifting assembly (200) comprising a hydraulic rod (230) and a lifting platform (210), a cylinder of the hydraulic rod (230) being fixedly connected to the mounting platform (120), and a piston end of the hydraulic rod (230) being fixedly connected to the lifting platform (210).

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

4. The device for passivating cutting edge micro defects before tool coating according to claim 2, characterized in that: A plurality of rotating fixing components (300) are plugged into the lower part of the lifting platform (210), and the rotating fixing components (300) include a rotating shaft (310) rotatably connected to the lifting platform (210), and a plurality of clamping claws (320) for fixing the tool are integrally connected to the bottom of the rotating shaft (310), and the plurality of clamping claws (320) are distributed in a ring array, and the outer periphery of the plurality of clamping claws (320) is threadedly connected with fixing bolts (330).

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

6. The device for passivating cutting edge micro defects before tool 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 top of the gathering cover (410) located above the fixed cover of the sand basin (110); a driving gear (411) is meshed on one side of the driven gear (412); and the driving gear (411) is rotatably connected to the fixed cover of the sand basin (110).

7. The device for passivating cutting edge micro defects before tool coating according to claim 6, characterized in that: A guide slope (420) for driving the sand grains in the sand basin (110) to rise is provided on the periphery of the gathering cover (410), and a plurality of feed holes (421) are provided on the side wall of the gathering cover (410) at the top of the highest point of the guide slope (420), and a baffle plate (422) for guiding the sand grains to enter the gathering cover (410) is provided at the edge of each feed hole (421).

8. The device for passivating cutting edge micro defects before tool coating according to claim 1, characterized in that: The lifting assembly (500) includes a plurality of driving columns (530) fixedly connected to the inner wall of the gathering cover (410), and a plurality of limiting bolts (540) are fixedly connected to the bottom of the main rod (510), each of the limiting bolts (540) is distributed in a circular array about the axis of the main rod (510), and the plurality of limiting bolts (540) are arranged at intervals, and the height of the bottom of the limiting bolt (540) is lower than the height of the top of the driving column (530).

9. The device for passivating cutting edge micro defects before tool coating according to claim 8, characterized in that: The limit bolt (540) is fan-shaped and is used to extend the time for the main rod (510) to be lifted 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.

10. A passivation method for the device for passivating cutting edge micro defects before tool coating according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, fixing the tool to be sharpened on the bottom of the rotating fixing assembly (300); S2, driving the cutting edge of the tool through the lifting assembly (200) to insert into the complete sand grains in the gathering cover (410); S3, gathering sand grains around the gathering cover (410) by means of a gathering cover (410) that rotates in the opposite direction to the tool; S4. When the plurality of driving columns (530) rotate following the gathering cover (410), the driving columns (530) drive the lifting cap (550) on the top of the main rod (510) to rise, and the lifted lifting cap (550) drives the complete sand grains to approach the bottom of the tool to be sharpened, and the gap between the lifting cap (550) and the side wall of the gathering cover (410) discharges the fine powdered sand. At the same time, the angular velocity difference between the stationary lifting cap (550) and the rotating gathering cover (410) disturbs the sand, thereby separating the complete sand grains from the fine powdered sand.

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