A polishing method and a polishing device for the edge of a micro drill bit

Abstract

The present invention discloses a polishing method and a polishing device for the edge of a micro drill bit, belonging to the technical field of micro drill bit processing. The polishing method for the edge of the micro drill bit includes the following steps: preparing a polishing liquid: uniformly mixing abrasive with deionized water to obtain a mixed liquid, adding polyethylene glycol into the mixed liquid, and ultrasonically vibrating and stirring for at least 10 minutes to make it fully and uniformly mixed to obtain the polishing liquid; polishing process: placing the tip of the micro drill bit vertically upward in the polishing liquid, and stirring the polishing liquid to make a relative movement occur between the polishing liquid and the micro drill bit, and the liquid level of the polishing liquid needs to be higher than the tip of the micro drill bit during the movement. The advantages are as follows: it can achieve micro machining of each edge of the micro drill bit through the abrasive, thereby improving the surface quality of the edge of the micro drill bit and reducing the wear rate of the edge during the processing of the micro drill bit.

Description

Technical Field

[0001] The present invention relates to the technical field of micro drill processing, and particularly to a polishing method and a polishing device for the edge of a micro drill. Background Art

[0002] With the rapid development of the rigid circuit board industry, the quality requirements for micro drills used in the processing of rigid circuit boards are getting higher and higher, including the surface roughness of the micro drill and the integrity of the edge. Among them, a micro drill refers to a drill with a diameter less than 0.3 mm, abbreviated as a micro drill.

[0003] Since most of the current micro drills are formed by grinding with a vitrified grinding wheel, when using vitrified abrasive for processing, defects such as burrs, micro notches, and surface damage of the edge are likely to occur at the edge of the micro drill. These defects will accelerate the wear of the edge during the use of the micro drill and seriously affect the service life of the micro drill. At the same time, since the edge of the micro drill formed by grinding with a vitrified grinding wheel is too sharp and the edge arc radius is small, it is easy to cause the overall cracking of the edge when the micro drill is used. Therefore, it is necessary to polish the edge of the micro drill.

[0004] However, due to the too small diameter and complex structure of the micro drill, it is very difficult to polish the surface of the edge of the micro drill by the processing method of grinding with a vitrified abrasive such as a grinding wheel or a sand belt.

[0005] In view of the above problems, there is an urgent need for a polishing method and a polishing device for the edge of a micro drill to solve the above problems. Summary of the Invention

[0006] An object of the present invention is to provide a polishing method for the edge of a micro drill, which can effectively improve the surface quality of the edge of the micro drill, thereby reducing the wear rate of the edge during micro drill processing and improving the service life of the micro drill.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] A polishing method for the edge of a micro drill for polishing the edge of a micro drill includes the following steps:

[0009] Prepare a polishing solution: uniformly mix abrasive with deionized water to obtain a mixed solution, add polyethylene glycol to the mixed solution, and ultrasonically vibrate and stir for at least 10 min to make it fully and uniformly mixed to obtain the polishing solution;

[0010] Polishing process: Place the tip of the micro drill vertically upward in the polishing solution, and stir the polishing solution so that relative movement occurs between the polishing solution and the micro drill, and the liquid level of the polishing solution needs to be higher than the tip of the micro drill during the movement.

[0011] Preferably, in the step of preparing the polishing liquid: the polishing liquid further includes an oxidation activator.

[0012] Another object of the present invention is to provide a polishing device for the edge of a micro drill bit, which can effectively improve the surface quality of the edge of the micro drill bit, thereby reducing the wear rate of the edge during the processing of the micro drill bit, so as to improve the service life of the micro drill bit.

[0013] To achieve this purpose, the present invention adopts the following technical solutions:

[0014] A polishing device for the edge of a micro drill bit, which applies the polishing method for the edge of the micro drill bit as described above. The polishing device for the edge of the micro drill bit includes:

[0015] A bracket;

[0016] A liquid storage barrel, which is fixedly arranged on the bracket. The liquid storage barrel is used for placing the polishing liquid. A material tray for placing and fixing the micro drill bit is arranged in the liquid storage barrel. The tip of the micro drill bit is vertically upward and fixed on the material tray;

[0017] A hollow shaft, one end of the hollow shaft passes through the top of the bracket and extends into the liquid storage barrel, and an impeller is fixedly arranged at the one end of the hollow shaft;

[0018] A first driving member, which is installed on the bracket, and the first driving member is drivingly connected to the hollow shaft. The first driving member is used for driving the hollow shaft to rotate, so that the impeller rotates to stir the polishing liquid to flow.

[0019] Preferably, a first pulley is arranged at the end of the hollow shaft where the impeller is not arranged, a second pulley is arranged on the output shaft of the first driving member, and the first pulley and the second pulley are drivingly connected by a first belt.

[0020] Preferably, the polishing device for the edge of the micro drill bit further includes:

[0021] A fixing plate, which is used for placing and fixing the material tray;

[0022] A connecting shaft, which is arranged inside the hollow shaft. The connecting shaft can rotate relative to the hollow shaft, and both ends of the connecting shaft extend out of both ends of the hollow shaft. One end of the connecting shaft located inside the liquid storage barrel is fixedly connected to the bottom end of the fixing plate;

[0023] A second driving member, which is drivingly connected to the connecting shaft. The second driving member is used for driving the connecting shaft to rotate, so that the fixing plate and the material tray rotate.

[0024] Preferably, one end of the connecting shaft that is not connected to the fixed plate is provided with a third pulley, and the output shaft of the second driving member is provided with a fourth pulley. The third pulley and the fourth pulley are connected by a second belt for transmission.

[0025] Preferably, both the first driving member and the second driving member are motors.

[0026] Preferably, the polishing device for the micro drill bit edge further includes:

[0027] A driving assembly, which is arranged outside the liquid storage barrel, and the driving assembly is used to drive the polishing liquid in the liquid storage barrel to circulate.

[0028] Preferably, the driving assembly includes:

[0029] Hoses, which are arranged on both sides outside the liquid storage barrel;

[0030] A driving body, which is used to drive the polishing liquid in the liquid storage barrel to circulate through the hoses;

[0031] A filter, which is used to filter the polishing liquid flowing through the hoses.

[0032] Preferably, the driving body is a peristaltic pump.

[0033] The beneficial effects of the present invention are as follows:

[0034] By preparing a special polishing liquid, then placing the tip of the micro drill bit vertically upward in the polishing liquid, and stirring the polishing liquid to make the polishing liquid and the micro drill bit move relatively, so that the polishing liquid polishes the edge of the micro drill bit. The operation is simple; and the liquid level of the polishing liquid needs to be kept higher than the tip of the micro drill bit during the whole movement process, so that during the whole movement process, the micro drill bit can be completely immersed in the polishing liquid to avoid the problem of incomplete processing of the edge of the micro drill bit by the polishing liquid; since the polishing liquid includes a polyethylene glycol shear thickening phase, the shear thickening phase will increase the solution viscosity of the polishing liquid as the shear speed increases, so as to increase the clamping force on the abrasive particles in the polishing liquid, thereby being able to achieve the micro-removal of the surface material of the edge of the micro drill bit, so as to remove the burrs, small notches and surface damage layers on the edge of the micro drill bit, thereby reducing the surface roughness of the edge of the micro drill bit and increasing the arc radius of the edge of the micro drill bit, achieving the purpose of optimizing the surface quality of the edge of the micro drill bit, and further reducing the wear rate of the edge of the micro drill bit during the drilling process of the micro drill bit and improving the service life of the micro drill bit. Description of the Drawings

[0035] Figure 1 is a cross-sectional view of the polishing device for the micro drill bit edge provided in the second embodiment of the present invention;

[0036] Figure 2 It is a schematic flow chart of the usage method of the polishing device for the edge of the micro drill bit provided in the third embodiment of the present invention.

[0037] Explanation of reference numerals:

[0038] 1 - Bracket; 2 - Liquid storage barrel; 3 - Hollow shaft; 31 - First pulley; 32 - Pin; 33 - Impeller; 4 - First driving member; 41 - Second pulley; 5 - First belt; 6 - Connecting shaft; 61 - Third pulley; 62 - Fixed flange; 7 - Second driving member; 71 - Fourth pulley; 8 - Second belt; 9 - Micro drill bit; 10 - Tray; 11 - Fixed plate; 12 - Locking device; 13 - Locking nut; 14 - Hose; 15 - Driving assembly; 16 - Filter; 17 - Driving body. Detailed implementation manners

[0039] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any manner.

[0040] Any feature disclosed in this specification, unless specifically described, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically described, each feature is only an example in a series of equivalent or similar features. Throughout the specification, the same reference numerals indicate the same elements.

[0041] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0043] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0044] To make the technical problems solved by the present invention, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the present invention will be further described below with reference to the drawings and through specific embodiments.

[0045] Since most of the current micro-drills are formed by grinding with a vitrified grinding wheel, defects such as burrs, micro-notch, and damage to the edge surface are likely to occur at the edge of the micro-drill during processing with vitrified abrasives. These defects will accelerate the wear of the edge of the micro-drill during use, seriously affecting the service life of the micro-drill. At the same time, since the edge of the micro-drill formed by grinding with a vitrified grinding wheel is too sharp and the edge arc radius is small, it is easy to cause the overall cracking of the edge when the micro-drill is used. Therefore, it is necessary to polish the edge of the micro-drill. However, due to the too small diameter and relatively complex structure of the micro-drill, it is very difficult to polish the edge surface of the micro-drill by means of grinding with a vitrified abrasive such as a grinding wheel or a sand belt.

[0046] Embodiment 1

[0047] To solve the above problems, in this embodiment, a polishing method for the edge of a micro-drill is proposed. A special polishing liquid is used to shear thicken for polishing the edge of the micro-drill 9, so as to improve the surface quality of the edge of the micro-drill 9, and further reduce the wear rate of the edge of the micro-drill 9 during drilling, thereby improving the service life of the micro-drill 9. Among them, shear thickening, also known as dilatancy, refers to the non-Newtonian fluid behavior in which the viscosity of the system shows an increase of several orders of magnitude with the increase of the shear rate or shear stress.

[0048] Specifically, the method for polishing the edge of the micro drill bit includes the following steps: preparing the polishing liquid: uniformly mixing fine abrasives with a particle size of 1-5 μm and deionized water in an appropriate ratio to obtain a mixed liquid, adding an appropriate ratio of polyethylene glycol to the mixed liquid, and ultrasonically vibrating and stirring for at least 10 minutes to fully mix them evenly to obtain the polishing liquid; polishing process: placing the tip of the micro drill bit 9 vertically upward in the polishing liquid and stirring the polishing liquid to cause relative movement between the polishing liquid and the micro drill bit 9, and the added polyethylene glycol can make the viscosity of the polishing liquid increase with the increase of the shear rate of the polishing liquid, so that a shear thickening effect can occur between the polishing liquid and the edge of the micro drill bit 9, thereby realizing the polishing process of the edge of the micro drill bit 9; Shear thickening means that when relative movement occurs, shear action occurs to cause the thickening of the polishing liquid solution, that is, the viscosity of the polishing liquid increases; At the same time, in order to ensure the uniformity of the polishing of the micro drill edge, the liquid level of the polishing liquid needs to be higher than the tip of the micro drill bit 9 during the entire movement process. Among them, polyethylene glycol (PEG) refers to oligomers or polymers of ethylene oxide. Polyethylene glycol is non-toxic, non-irritating, slightly bitter in taste, has good water solubility, and has good compatibility with many organic components, so it has excellent lubricity, moisturizing property, dispersibility, and adhesiveness, and is widely used in the cosmetics, pharmaceutical, chemical fiber, metal processing, and food processing industries.

[0049] By preparing a special polishing liquid, then placing the tip of the micro drill bit 9 vertically upward in the polishing liquid and stirring the polishing liquid to cause relative movement between the polishing liquid and the micro drill bit 9, the polishing liquid is used to polish the edge of the micro drill bit 9, and the operation is simple; And the liquid level of the polishing liquid needs to be ensured to be higher than the tip of the micro drill bit 9 during the entire movement process, so that during the entire processing process, the micro drill bit 9 can be completely immersed in the polishing liquid to avoid the problem that the micro drill bit 9 is not immersed in the polishing liquid, resulting in incomplete processing of the edge of the micro drill bit 9; Since the polishing liquid includes a polyethylene glycol shear thickening phase, the shear thickening phase will increase the solution viscosity of the polishing liquid with the increase of the shear rate, so as to increase the clamping force on the abrasive particles in the polishing liquid, thereby realizing the micro-removal of the surface material of the edge of the micro drill bit 9, removing burrs, micro notches, and surface damage layers on the edge of the micro drill bit 9, thereby reducing the surface roughness of the edge of the micro drill bit 9 and increasing the arc radius of the edge of the micro drill bit 9, achieving the purpose of optimizing the surface quality of the edge of the micro drill bit 9, and further reducing the wear rate of the edge during the drilling process of the micro drill bit 9 and improving the service life of the micro drill bit 9.

[0050] Further, in the step of preparing the polishing liquid: the polishing liquid further includes an oxidation activator, which can improve the oxidation activity of the polishing liquid, promote a weak chemical reaction on the surface of the micro drill 9, thereby reducing the hardness of the material layer to be removed; in the preparation of the polishing liquid, the oxidation activator can be added to the polishing liquid according to actual polishing requirements; and during the preparation of the entire polishing liquid, an ultrasonic stirrer is required to fully stir it evenly before use; at the same time, when not in processing, the polishing liquid should also be kept in a flowing state to prevent the abrasive from settling and aggregating under the action of gravity, affecting the use effect of the entire polishing liquid. In other embodiments, the polishing liquid may not include an oxidation activator. Whether to add an oxidation activator to the polishing liquid needs to be determined according to actual polishing requirements and specific processing conditions. In this embodiment, the abrasive is diamond. In other embodiments, the abrasive can also be silicon carbide, alumina, silica or cerium oxide. In this embodiment, the oxidation activator is hydrogen peroxide. In other embodiments, the oxidation activator can also be potassium permanganate, perphosphoric acid or other substances with strong oxidation activity.

[0051] Embodiment 2

[0052] In this embodiment, a polishing device for the edge of a micro drill is proposed, which is applied to the polishing method for the edge of the micro drill in Embodiment 1 to polish the edge of the micro drill 9, so as to improve the surface quality of the edge of the micro drill 9, and further reduce the wear rate of the edge during drilling, and improve the service life of the micro drill 9.

[0053] Specifically, as Figure 1 shown, the polishing device for the edge of the micro drill includes a bracket 1, a liquid storage barrel 2, a hollow shaft 3 and a first driving member 4. Among them, the liquid storage barrel 2 is fixedly arranged at the top of the bracket 1 by screws. The liquid storage barrel 2 is used to place the polishing liquid. A tray 10 for placing and fixing the micro drill 9 is arranged in the liquid storage barrel 2. The tips of the micro drills 9 are vertically and upwardly fixed on the tray 10, and the liquid level of the polishing liquid is higher than the tips of the micro drills 9 to ensure that the micro drills 9 can be completely immersed in the polishing liquid when the polishing liquid flows, so as to facilitate the polishing liquid to polish the tip edge of the micro drills 9; one end of the hollow shaft 3 passes through the top of the bracket 1 and extends into the liquid storage barrel 2. The hollow shaft 3 can rotate relative to the bracket 1, and an impeller 33 is fixedly arranged at the end of the hollow shaft 3 located in the liquid storage barrel 2; the first driving member 4 is fixedly installed on the bracket 1, and the first driving member 4 is drivingly connected to the hollow shaft 3. The first driving member 4 is used to drive the hollow shaft 3 to rotate, so as to drive the impeller 33 to rotate, thereby stirring the polishing liquid to flow in a certain direction, so that relative movement can occur between the polishing liquid and the micro drill 9. In this embodiment, the first driving member 4 is a motor.

[0054] By fixedly arranging the liquid storage bucket 2 for placing the prepared polishing liquid on the bracket 1, and arranging a tray 10 for placing and fixing the micro drill 9 in the liquid storage bucket 2, the tip of the micro drill 9 is fixedly arranged on the tray 10 with the tip facing vertically upward, and the liquid level of the polishing liquid is higher than the tip of the micro drill 9, the operation and use are simple; when the first driving member 4 operates, it can drive the hollow shaft 3 to rotate, so that the impeller 33 fixedly arranged on the hollow shaft 3 rotates, thereby driving the polishing liquid in the entire liquid storage bucket 2 to flow in a directional manner; thus, the prepared polishing liquid forms a relative movement with the surface of the cutting edge of the micro drill 9, and as the relative movement rate increases, the polyethylene glycol in the polishing liquid can increase the solution viscosity of the polishing liquid, so as to increase the clamping force on the abrasive particles in the polishing liquid, thereby enabling micro-removal of the surface material of the cutting edge of the micro drill 9, removing burrs, small notches, and surface damage layers on the cutting edge of the micro drill 9, reducing the surface roughness of the cutting edge of the micro drill 9 and increasing the arc radius of the cutting edge of the micro drill 9, thereby achieving the purpose of optimizing the surface quality of the cutting edge of the micro drill 9.

[0055] Further, as Figure 1 shown, a first pulley 31 is arranged at one end of the hollow shaft 3 where the impeller 33 is not arranged, a second pulley 41 is arranged on the output shaft of the first driving member 4, and the first pulley 31 and the second pulley 41 are connected by a first belt 5 in a transmission manner, so that the driving force of the first driving member 4 is transmitted to the hollow shaft 3 in sequence through the second pulley 41, the first belt 5 and the first pulley 31, so that the hollow shaft 3 rotates to drive the impeller 33 to rotate, thereby stirring the polishing liquid to flow in a directional manner, so that a relative movement can occur between the polishing liquid and the micro drill 9. Among them, a bearing and a sleeve (not marked in the figure) are sleeved outside the hollow shaft 3 and fixed by a bearing end cover and a screw (not marked in the figure); and the first pulley 31 is fixed on the hollow shaft 3 by a pin 32, and the length of the pin 32 is much smaller than the inner hole diameter of the hollow shaft 3, so as to facilitate the disassembly of the pin 32.

[0056] In order to make the contact between the polishing liquid and each cutting edge of the micro drill 9 more uniform, so that the shear thickening processing between the polishing liquid and each cutting edge of the micro drill 9 is more uniform; as Figure 1As shown in the figure, the polishing device for the edge of the micro drill bit further includes a fixing plate 11, a connecting shaft 6 and a second driving member 7. Among them, the fixing plate 11 is used to place and fix the material tray 10, and the material tray 10 and the fixing plate 11 are locked by a locking device 12; the connecting shaft 6 passes through and is installed in the hollow shaft 3, and the connecting shaft 6 can rotate relative to the hollow shaft 3, and both ends of the connecting shaft 6 extend out of both ends of the hollow shaft 3. One end of the connecting shaft 6 is fixedly connected to the bottom end of the fixing plate 11, that is, the fixing plate 11 is connected to each other by screws and a fixing flange 62 fixedly connected to the connecting shaft 6, and is locked by a locking nut 13 to fixedly connect the connecting shaft 6 and the fixing plate 11; the second driving member 7 is drivingly connected to the connecting shaft 6, and the second driving member 7 is used to drive the connecting shaft 6 to rotate, so that the fixing plate 11 and the material tray 10 rotate, thereby making the micro drill bit 9 rotate. Among them, a bearing and a sleeve (not marked in the figure) are sleeved outside the connecting shaft 6 and fixed by a bearing end cover (not marked in the figure). In this embodiment, the second driving member 7 is a motor.

[0057] When the second driving member 7 operates, it drives the connecting shaft 6 to rotate, so that the fixing plate 11 fixedly connected to the connecting shaft 6 rotates, thereby driving the material tray 10 and the micro drill bit 9 on the fixing plate 11 to rotate; so that the polishing liquid can process the surfaces of the edges of the micro drill bit 9 more evenly, so that the surface materials of the edges of the micro drill bit 9 can be removed more evenly, so as to remove the burrs, small notches and surface damage layers on the edges of the micro drill bit 9, further reduce the surface roughness of the edges of the micro drill bit 9 and increase the arc radius of the edges of the micro drill bit 9, and further reduce the wear rate of the edges of the micro drill bit 9 during drilling, and further improve the service life of the micro drill bit 9.

[0058] Specifically, as Figure 1 shown, a third pulley 61 is provided at one end of the connecting shaft 6 that is not fixedly connected to the fixing plate 11, and a fourth pulley 71 is provided on the output shaft of the second driving member 7. The third pulley 61 and the fourth pulley 71 are drivingly connected by a second belt 8, so that the driving force of the second driving member 7 is transmitted to the connecting shaft 6 through the fourth pulley 71, the second belt 8 and the third pulley 61 in sequence, so that the connecting shaft 6 rotates, driving the fixing plate 11 and the material tray 10 to rotate, so that the micro drill bit 9 rotates, so that the contact between the polishing liquid and the edges of the micro drill bit 9 is more uniform, so that the polishing liquid can polish each surface of the edges of the micro drill bit 9.

[0059] In order to filter the cutting impurities generated during the polishing process and prevent the abrasives in the polishing liquid from settling and agglomerating, as Figure 1As shown in the figure, the polishing device for the edge of the micro drill bit further includes a driving assembly 15. The driving assembly 15 is arranged outside the liquid storage barrel 2, and the driving assembly 15 is used to drive the polishing liquid in the liquid storage barrel 2 to circulate. Specifically, the driving assembly 15 includes a hose 14, a driving body 17 and a filter 16. Among them, the hose 14 is arranged on both sides outside the liquid storage barrel 2; the driving body 17 is used to drive the polishing liquid in the liquid storage barrel 2 to flow out to the hose 14 through one side outside the liquid storage barrel 2 and flow back into the liquid storage barrel 2 through the other side outside the liquid storage barrel 2, so as to realize the circulation of the polishing liquid, thereby preventing the abrasives in the polishing liquid from settling and agglomerating; among them, the filter 16 is used to filter large particle grinding debris in the polishing liquid circulating through the hose 14 and filter cutting impurities generated during the polishing process, so as to avoid damaging the micro drill bit 9 during the relative movement between the polishing liquid and the micro drill bit 9. Among them, the amount of the polishing liquid in the liquid storage barrel 2 needs to be ensured to be sufficient to ensure that the micro drill bit 9 is completely immersed in the polishing liquid during the directional flow and circulation of the polishing liquid, so that the polishing process can proceed smoothly. In this embodiment, the driving body 17 is a peristaltic pump. The peristaltic pump has the characteristics of rapid pump tube replacement, reversible fluid, dry running and low maintenance cost.

[0060] By making the driving body 17 drive the polishing liquid in the liquid storage barrel 2 to circulate through the hose 14, it is ensured that the polishing liquid can be in a flowing state during the whole polishing process, thereby preventing the abrasives in the polishing liquid from settling, agglomerating and other phenomena under the action of gravity, and not affecting the use effect of the polishing liquid. At the same time, the filter 16 filters the cutting impurities generated during the polishing process in the polishing liquid, so as to avoid damaging the micro drill bit 9 during the relative movement between the polishing liquid and the micro drill bit 9.

[0061] Embodiment III

[0062] In this embodiment, a method for using the polishing device for the edge of the micro drill bit in Embodiment II is proposed, including the following steps: As Figure 2As shown, prepare the polishing liquid: uniformly mix abrasives with a particle size of 1 - 5 μm with deionized water in an appropriate proportion to obtain a mixed liquid; add an appropriate proportion of polyethylene glycol to the mixed liquid and stir it with ultrasonic vibration for at least 10 minutes to ensure that the mixed liquid and polyethylene glycol are fully and evenly mixed; add a certain proportion of oxidation activator to prepare the polishing liquid; Add the polishing liquid: Place the tips of the micro drills 9 vertically upward on the material tray 10, and add a sufficient amount of the prepared polishing liquid into the liquid storage barrel 2 so that the liquid level of the polishing liquid is higher than the tips of the micro drills 9, thereby ensuring that the entire micro drill 9 can be completely immersed in the polishing liquid under the conditions of circulating flow and directional flow; Start the first driving member 4: Start the first driving member 4, and the driving force of the first driving member 4 is transmitted to the hollow shaft 3 through the second pulley 41, the first belt 5 and the first pulley 31 in sequence to drive the hollow shaft 3 to rotate, so that the impeller 33 fixed on the hollow shaft 3 rotates. The rotation of the impeller 33 drives the directional flow of the polishing liquid, so that relative movement occurs between the polishing liquid and the micro drill 9. Thus, through the relative movement between the abrasive and the edge of the micro drill 9, a small amount of material on the surface of the edge of the micro drill 9 is removed to optimize the surface quality of the edge of the micro drill 9; Start the second driving member 7: Start the second driving member 7, and the driving force of the second driving member 7 is transmitted to the connecting shaft 6 through the fourth pulley 71, the second belt 8 and the third pulley 61 in sequence to drive the connecting shaft 6 to rotate, so that the fixing plate 11 fixedly connected to the connecting shaft 6 rotates. The rotation of the fixing plate 11 drives the material tray 10 and the micro drill 9 to rotate, making the contact between the polishing liquid and the micro drill 9 more uniform and the polishing process more uniform; Start the third driving member 15: Start the third driving member 15 simultaneously to drive the entire polishing liquid to circulate through the hose 14, thereby preventing phenomena such as sedimentation and agglomeration of the abrasives in the polishing liquid under the action of gravity. Among them, the filter 16 filters out larger chip impurities in the circulating polishing liquid.

[0063] Specific usage steps of the usage method of the polishing device for the edge of the micro drill in this embodiment: First, uniformly mix abrasives with a particle size of 1 - 5 μm with deionized water in an appropriate proportion to obtain a mixed liquid; add an appropriate proportion of polyethylene glycol to the mixed liquid and stir it with ultrasonic vibration for at least 10 minutes to ensure that the mixed liquid and polyethylene glycol are fully and evenly mixed; add a certain proportion of oxidation activator to prepare the polishing liquid;

[0064] Then, place the tips of the micro-drills 9 vertically upward on the material tray 10, and lock the material tray 10 containing the micro-drills 9 on the fixed plate 11 through the lock 12; and add a sufficient amount of prepared polishing liquid into the liquid storage barrel 2 so that the liquid level of the polishing liquid is higher than the tips of the micro-drills 9 during the whole processing process; start the first driving member 4 to drive the hollow shaft 3 to rotate, so that the impeller 33 rotates, and the rotation of the impeller 33 drives the polishing liquid to flow directionally, so that relative movement occurs between the polishing liquid and the cutting edges of the micro-drills 9.

[0065] Finally, start the second driving member 7 to drive the connecting shaft 6 to rotate, so that the fixed plate 11 fixedly connected to the connecting shaft 6 rotates, and the rotation of the fixed plate 11 drives the material tray 10 and the micro-drills 9 to rotate, so that the contact between the polishing liquid and each cutting edge of the micro-drills 9 is more uniform and the processing is more uniform; at the same time, start the third driving member 15 to drive the whole polishing liquid to circulate through the hose 14 to prevent phenomena such as sedimentation and agglomeration of the abrasive in the polishing liquid under the action of gravity. Among them, the filter 16 filters the larger chip impurities in the circulating polishing liquid.

[0066] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A polishing device for a micro drill bit edge, It is characterized in that The polishing device of the micro drill bit cutting edge comprises: Bracket (1); Micro drill bit (9); a liquid storage barrel (2) fixedly mounted on the support (1), the liquid storage barrel (2) being used to store polishing liquid, a material tray (10) for placing and fixing the micro drill bit (9) being arranged inside the liquid storage barrel (2), the tip of the micro drill bit (9) being fixed vertically upward on the material tray (10); A hollow shaft (3), one end of the hollow shaft (3) passes through the top end of the bracket (1) and extends into the liquid storage barrel (2), and an impeller (33) is fixedly provided on the one end of the hollow shaft (3); a first driving member (4) mounted on the bracket (1), and the first driving member (4) is drivingly connected to the hollow shaft (3), the first driving member (4) being used to drive the hollow shaft (3) to rotate so as to rotate the impeller (33) to stir the polishing liquid to flow; The polishing liquid comprises: an abrasive, deionized water and polyethylene glycol, wherein the polyethylene glycol can increase the viscosity of the polishing liquid as the shear rate of the polishing liquid increases; The polishing device of the micro drill bit cutting edge also includes: A fixing plate (11) for placing and fixing the material tray (10); a connecting shaft (6) which is inserted into the hollow shaft (3); the connecting shaft (6) is rotatable relative to the hollow shaft (3); and both ends of the connecting shaft (6) extend out of both ends of the hollow shaft (3); and one end of the connecting shaft (6) located in the liquid storage barrel (2) is fixedly connected to the bottom end of the fixing plate (11); A second driving member (7) is drivingly connected to the connecting shaft (6), and the second driving member (7) is used to drive the connecting shaft (6) to rotate, so as to rotate the fixing plate (11) and the material tray (10).

2. The micro drill bit edge polishing device as claimed in claim 1, It is characterized in that A first belt pulley (31) is provided on the end of the hollow shaft (3) where the impeller (33) is not provided, a second belt pulley (41) is provided on the output shaft of the first driving member (4), and the first belt pulley (31) and the second belt pulley (41) are connected in transmission via a first belt (5).

3. The micro drill bit edge polishing device as claimed in claim 1, It is characterized in that A third pulley (61) is provided on the end of the connecting shaft (6) that is not connected to the fixing plate (11), a fourth pulley (71) is provided on the output shaft of the second driving member (7), and the third pulley (61) and the fourth pulley (71) are connected to each other through a second belt (8).

4. The micro drill bit edge polishing device as claimed in claim 1, It is characterized in that The first driving member (4) and the second driving member (7) are both motors.

5. The micro drill bit edge polishing device as claimed in claim 1, It is characterized in that The polishing device of the micro drill bit cutting edge also includes: A driving component (15) is arranged outside the liquid storage barrel (2), and the driving component (15) is used to drive the polishing liquid in the liquid storage barrel (2) to circulate.

6. The polishing device for the edge of a micro drill bit according to claim 5, characterized in that the driving component (15) includes: Hoses (14) are arranged on both sides outside the liquid storage barrel (2); A driving body (17) is used to drive the polishing liquid in the liquid storage barrel (2) to circulate through the hoses (14); A filter (16) is used to filter the polishing liquid flowing through the hoses (14).

7. The polishing device for the edge of a micro drill bit according to claim 6, characterized in that the driving body (17) is a peristaltic pump.

8. A method for polishing the edge of a micro drill bit, applied to the polishing device for the edge of a micro drill bit according to any one of claims 1-7, characterized in that it includes the following steps: Preparing the polishing liquid: uniformly mixing the abrasive and the deionized water to obtain a mixed liquid, adding the polyethylene glycol to the mixed liquid, and ultrasonically vibrating and stirring for at least 10 minutes to fully mix them evenly to obtain the polishing liquid; Polishing process: Place the tip of the micro drill bit (9) vertically upward in the polishing liquid, and stir the polishing liquid so that relative movement occurs between the polishing liquid and the micro drill bit (9), and the liquid level of the polishing liquid needs to be always higher than the tip of the micro drill bit (9) during the movement.

9. The method for polishing the edge of a micro drill bit according to claim 8, characterized in that in the step of preparing the polishing liquid: the polishing liquid further includes an oxidation activator.

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