Micro drill bit polishing method and polishing device

Abstract

The present invention relates to the field of micro drill polishing processing, and discloses a micro drill polishing method and a polishing device. The micro drill polishing method comprises: step S1, extending the part of the micro drill to be polished into a magnetorheological polishing liquid; step S2, applying a magnetic field around the micro drill to make the magnetorheological polishing liquid form a flexible polishing pad; step S3, driving the micro drill to perform eccentric rotational motion to polish the micro drill. The micro drill polishing method provided by the present invention can realize the polishing of the micro drill cutting edge, remove burrs and tiny notches on the cutting edge surface, and improve the service life of the micro drill. The micro drill polishing device provided by the present invention can realize the removal of trace materials from the cutting edge of the micro drill through the mutual cooperation of a material tray, a liquid barrel, and a magnetic part, thereby improving the cutting edge quality and the service life of the micro drill.

Description

Technical Field

[0001] The invention relates to the field of micro drill polishing, and in particular to a micro drill polishing method and a polishing device. Background Art

[0002] With the rapid development of the rigid circuit board industry, the requirements for micro drills used in rigid circuit board processing are becoming increasingly stringent. The diameter of such micro drills is typically less than 0.3 mm, and processing requirements include the drill material, structure, surface roughness, and cutting edge integrity. Currently, these micro drills are produced using bonded grinding wheels. This inevitably results in surface defects such as burrs and notches at the cutting edge. These defects accelerate wear during use, seriously reducing the drill's service life. Furthermore, the micro drill's cutting edge is too sharp and has a small cutting edge radius, which can easily lead to overall cutting edge fracture during use. Therefore, after grinding with a bonded grinding wheel, the micro drill needs to be polished to obtain a micro drill with a smooth surface and high-quality cutting edge processing. However, due to the small diameter of these micro drills, polishing their cutting edge surface is difficult to achieve using bonded abrasive grinding methods such as grinding wheels and sanding belts, resulting in poor processing quality for existing micro drills.

[0003] Therefore, there is an urgent need for a micro drill polishing method and a polishing device to improve the processing quality of the micro drill cutting edge, thereby improving the processing quality and service life of the micro drill. Summary of the Invention

[0004] The purpose of the present invention is to provide a micro drill polishing method and a polishing device to achieve the polishing of the micro drill cutting edge and improve the processing quality and service life of the micro drill.

[0005] To this end, the present invention adopts the following technical solutions:

[0006] A micro drill polishing method comprises the following steps:

[0007] Step S1, inserting the part to be polished of the micro drill into the magnetorheological polishing fluid;

[0008] Step S2, applying a magnetic field around the micro drill bit to make the magnetorheological polishing fluid form a flexible polishing pad;

[0009] Step S3: driving the micro drill to perform eccentric rotational motion to polish the micro drill.

[0010] Preferably, step S1 specifically includes:

[0011] Place the tray with the micro drill bit into the liquid bucket;

[0012] Adjust the distance between the magnetic piece and the tray;

[0013] Add magnetorheological polishing fluid.

[0014] The present invention also provides a micro drill polishing device, which uses the above-mentioned micro drill polishing method to polish the micro drill, and the micro drill polishing device includes:

[0015] A carrying assembly, used for carrying the micro drill bit, the carrying assembly being configured to drive the micro drill bit to rotate eccentrically;

[0016] A liquid barrel is used to contain magnetorheological polishing liquid, and the part of the micro drill bit to be polished is in contact with the magnetorheological polishing liquid;

[0017] The magnetic component is used to form a magnetic field around the micro drill.

[0018] Preferably, the carrying assembly includes a material tray capable of eccentric rotation, and the micro drill bit is loaded on the material tray.

[0019] Preferably, the micro drill polishing device further comprises a first driving mechanism, an output end of the first driving mechanism is connected to the material tray, and the first driving mechanism is configured to drive the material tray to rotate eccentrically.

[0020] Preferably, the first driving mechanism includes a first rotating member and a first driving member, the output end of the first driving member is connected to one end of the first rotating member, the other end of the first rotating member is connected to the material tray, and the rotation axis of the first rotating member does not coincide with the central axis of the material tray, so that the first driving member can drive the material tray to perform eccentric rotational motion through the first rotating member.

[0021] Preferably, the micro drill polishing device further includes a second driving mechanism for driving the magnetic member to rotate to form a dynamic magnetic field.

[0022] Preferably, the second driving mechanism includes a second driving member, an internal gear and multiple gear shafts, the output end of the second driving member is connected to the internal gear, the multiple gear shafts are engaged with the internal gear, a through hole is provided on the gear shaft, the center axis of the through hole is eccentrically arranged to the rotation axis of the corresponding gear shaft, and a magnetic member is provided in the through hole on each gear shaft.

[0023] Preferably, the distance between the magnetic member and the material tray is adjustable.

[0024] Preferably, the tray is capable of loading a plurality of micro drill bits.

[0025] Beneficial effects of the present invention:

[0026] The micro-drill polishing method proposed in the present invention includes the following steps: inserting the portion of the micro-drill to be polished into a magnetorheological polishing fluid, which is used to form a flexible polishing pad for polishing the micro-drill, while controlling the polishing force to prevent the micro-drill from deformation or breakage; applying a magnetic field around the micro-drill to cause the magnetorheological polishing fluid to form a flexible polishing pad; and driving the micro-drill to perform eccentric rotational motion, thereby causing the micro-drill and the flexible polishing pad to form relative motion and thereby polish the micro-drill. This micro-drill polishing method can polish the cutting edge of micro-drills with extremely small diameters and complex structures, remove burrs, tiny notches, and subsurface damage layers on the cutting edge surface, reduce cutting edge surface roughness, increase the cutting edge arc radius, and thereby reduce the rate of cutting edge wear during drilling, thereby improving the service life and drilling quality of the micro-drill.

[0027] The micro drill polishing device proposed in the present invention polishes the micro drill based on the above-mentioned micro drill polishing method. The micro drill polishing device can remove trace materials from the cutting edge surface of the micro drill, improve the cutting edge surface quality, and thus increase the service life of the micro drill. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 1 is a schematic structural diagram of a micro drill polishing device provided in Example 1 of the present invention;

[0029] Figure 2 is a cross-sectional view of the eccentric plate provided in Example 1 of the present invention;

[0030] Figure 3 is a top view of the eccentric plate provided in Example 1 of the present invention;

[0031] Figure 4 is a cross-sectional view of a gear shaft provided in Example 1 of the present invention;

[0032] Figure 5 is a top view of the gear shaft provided in the first embodiment of the present invention;

[0033] Figure 6 This is an assembly diagram of the adjustment assembly and the gear shaft provided in the first embodiment of the present invention;

[0034] Figure 7 This is a flow chart of a micro drill polishing method provided in the second embodiment of the present invention;

[0035] Figure 8 is a schematic diagram of a micro drill polishing method provided in a second embodiment of the present invention;

[0036] Figure 9 Schematic diagram of the interaction between the micro drill bit and the magnetorheological polishing fluid provided in the second embodiment of the present invention.

[0037] In the picture:

[0038] 1. Micro drill bit;

[0039] 2. Carrying assembly; 21. Material tray; 211. Limit pin; 212. Material tray foot; 22. Eccentric plate; 221. First mounting hole; 23. Connecting flange;

[0040] 3. Magnetic parts;

[0041] 4. First driving mechanism; 41. First rotating member; 42. First driving member;

[0042] 43. First transmission assembly; 431. First driven pulley; 432. First transmission belt; 433. First driving pulley;

[0043] 5. Liquid barrel;

[0044] 6. Second driving mechanism; 61. Second driving member; 62. Internal gear; 63. Gear shaft; 631. Through hole;

[0045] 64. Second transmission assembly; 641. Second driving pulley; 642. Second transmission belt; 643. Second driven pulley; 644. Hollow shaft; 645. First mounting plate;

[0046] 7. Baffle plate;

[0047] 8. Adjustment assembly; 81. Second mounting plate; 811. Second mounting hole; 812. Second center hole; 82. Guide column;

[0048] 9. Flexible polishing pad; 91. Magnetic solid particles; 92. Abrasive particles;

[0049] 100. Base. DETAILED DESCRIPTION

[0050] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly understood, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the described embodiments are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0051] Example 1:

[0052] This embodiment provides a micro drill polishing device, such as Figure 1As shown, the micro drill polishing device includes a carrier assembly 2, a fluid barrel 5, and a magnetic component 3. The carrier assembly 2 is used to carry the micro drill 1 and is configured to drive the micro drill 1 in eccentric rotation. The fluid barrel 5 contains magnetorheological polishing fluid, into which the portion of the micro drill 1 to be polished extends. The magnetorheological polishing fluid is used to form a flexible polishing pad 9 for polishing the micro drill 1. The flexible polishing pad 9 can control the forces acting on the micro drill 1 during the processing process, preventing deformation and damage to the micro drill 1. The magnetic component 3 is used to form a magnetic field around the micro drill 1, thereby causing the magnetorheological polishing fluid to form a flexible polishing pad 9. Under the action of the magnetic field, the magnetorheological polishing fluid immediately forms a high-viscosity, low-fluidity Binham elastomer due to the magnetorheological effect, which is referred to as a flexible polishing pad in this specification. The micro drill polishing device can polish the cutting edge of a micro drill 1 with an extremely small diameter and complex structure, remove burrs, tiny notches and subsurface damage layers on the cutting edge, improve the surface quality of the micro drill 1, and thereby increase the service life of the micro drill 1.

[0053] Optionally, the carrying assembly 2 includes a tray 21 capable of eccentric rotation, and the micro drill bit 1 is loaded on the tray 21. Specifically, a fixture is provided on the tray 21, and the micro drill bit 1 is loaded on the tray 21 through the fixture, and is driven by the tray 21 to rotate eccentrically.

[0054] Furthermore, the tray 21 can be loaded with multiple micro drill bits 1. Loading multiple micro drill bits 1 at a time can improve the polishing efficiency of the micro drill bits 1. In this embodiment, the tray 21 is loaded with multiple micro drill bit groups, which are spaced apart along the circumference of the tray 21. Each micro drill bit group includes multiple micro drill bits 1. The multiple micro drill bits 1 are spaced apart along the radial direction of the tray 21, so that the micro drill bits 1 on the tray 21 are radially distributed around the center of the tray 21.

[0055] In order to drive the micro drill 1 to rotate and make the micro drill 1 and the flexible polishing pad 9 form relative movement, thereby polishing the micro drill 1, the micro drill polishing device also includes a first driving mechanism 4, the output end of the first driving mechanism 4 is connected to the material tray 21, and the first driving mechanism 4 is configured to drive the material tray 21 to rotate eccentrically, thereby driving the micro drill 1 to rotate eccentrically.

[0056] Specifically, the first drive mechanism 4 includes a first rotating member 41 and a first driving member 42. The output end of the first driving member 42 is connected to one end of the first rotating member 41, and the other end of the first rotating member 41 is connected to the material tray 21. The rotation axis of the first rotating member 41 does not coincide with the central axis of the material tray 21, so that the first driving member 42 can drive the material tray 21 to perform eccentric rotational motion through the first rotating member 41, thereby causing relative motion between the micro drill bit 1 and the flexible polishing pad 9 formed by the above-mentioned magnetorheological polishing fluid. In addition, in this embodiment, the material tray 21 is loaded with multiple micro drill bits 1. Through the eccentric motion of the material tray 21, each micro drill bit 1 can pass through the center area of ​​the magnetic field, which can improve the processing uniformity of the edge polishing of the micro drill bit 1.

[0057] In this embodiment, the supporting assembly 2 is disposed in the liquid barrel 5, the bottom of the micro drill bit 1 is loaded on the material tray 21, the portion to be polished of the micro drill bit 1 faces upward, the micro drill bit 1 is immersed in the magnetorheological polishing liquid, and the magnetic component 3 is disposed above the micro drill bit 1. The upward arrangement of the portion to be polished of the micro drill bit 1 facilitates the loading of the micro drill bit 1, simplifies the design of the fixture on the material tray 21, and controls the clamping force to avoid deformation and damage to the micro drill bit 1 caused by excessive clamping force. Of course, the loading method of the micro drill bit 1 and the positional relationship between the micro drill bit 1, the supporting assembly 2, and the magnetic component 3 are not limited to this, as long as the portion to be processed of the micro drill bit 1 can be inserted into the magnetorheological polishing liquid and a magnetic field can be formed around the micro drill bit 1.

[0058] Optionally, in order to realize the eccentric rotational movement of the material tray 21, the supporting assembly 2 also includes an eccentric plate 22 and a connecting flange 23. The material tray 21 is installed on the eccentric plate 22, and the eccentric plate 22 is connected to the first rotating member 41 through the connecting flange 23. The central axis of the eccentric plate 22 does not coincide with the rotation center of the first rotating member 41. The first rotating member 41 can drive the eccentric plate 22 to rotate eccentrically and drive the material tray 21 to perform eccentric rotational movement.

[0059] Optionally, in order to facilitate the accurate installation of the above-mentioned material tray 21 on the eccentric plate 22, as shown in FIG. Figure 1-Figure 3As shown, the feed tray 21 is provided with a feed tray foot 212, and the eccentric plate 22 is provided with a first mounting hole 221 corresponding to the feed tray foot 212. The feed tray foot 212 can cooperate with the first mounting hole 221 to achieve positioning and connection between the feed tray 21 and the eccentric plate 22. In addition, the eccentric plate 22 is fixed by screws and a connecting flange 23, and the connecting flange 23 is fixed to the first rotating member 41 by a fastening nut. The threaded connection has the advantages of simple processing and convenient assembly and disassembly. Of course, the connection method between the above-mentioned feed tray 21 and the first rotating member 41 is not limited to this, and other connection methods can also be used. As long as the central axis of the feed tray 21 and the rotation center of the first rotating member 41 do not coincide, the first rotating member 41 can drive the feed tray 21 to perform eccentric rotational motion. Similarly, the fixing method of the eccentric plate 22 and the connecting flange 23, and the connecting flange 23 and the first rotating member 41 is also not limited to this, as long as the above-mentioned connection function can be achieved.

[0060] Optionally, the first driving member 42 is a first motor, the first rotating member 41 is a rotating shaft, and the first driving mechanism 4 further includes a first transmission assembly 43 . The first driving member 42 drives the first rotating member 41 to rotate via the first transmission assembly 43 .

[0061] Specifically, the first transmission assembly 43 includes a first driven pulley 431, a first transmission belt 432, and a first driving pulley 433. The output end of the first driving member 42 is connected to the first driving pulley 433. The first transmission belt 432 is tensioned and wound around the first driving pulley 433 and the first driven pulley 431. The first driving pulley 433 inputs power into the first driven pulley 431 via the first transmission belt 432. The output end of the first driven pulley 431 is connected to the first rotating member 41. The specific process of the first driving mechanism 4 driving the material tray 21 to eccentrically rotate is as follows: when the first driving member 42 is working, it can drive the first driving pulley 433 to rotate, and the movement of the first transmission belt 432 drives the rotation of the first driven pulley 431 and the first rotating member 41. The first rotating member 41 drives the eccentric plate 22 to rotate via the connecting flange 23, thereby achieving eccentric rotation of the material tray 21. The first driving mechanism 4 has a simple structure, stable and precise transmission, and can achieve better control of the material tray 21.

[0062] In order to promote the flow of abrasive particles in the magnetorheological polishing fluid and improve the utilization efficiency of the abrasive particles, the micro drill polishing device also includes a second driving mechanism 6 to drive the magnetic part 3 to rotate to form a dynamic magnetic field. The distribution of magnetic flux lines in the dynamic magnetic field changes all the time. Under the action of the dynamic magnetic field, the magnetorheological polishing fluid forms a dynamic flexible polishing pad 9. The dynamic flexible polishing pad 9 can move and flip, and the particle clusters in the flexible polishing pad 9 continue to flow, promoting the renewal of particle clusters in the processing area and the self-sharpening of the flexible polishing pad 9.

[0063] Furthermore, the second driving mechanism 6 includes a second driving member 61, an internal gear 62 and a plurality of gear shafts 63. The output end of the second driving member 61 is connected to the internal gear 62. The plurality of gear shafts 63 are all engaged with the internal gear 62. A through hole 631 is provided on the gear shaft 63. Figure 4 and Figure 5 As shown, the central axis of the through hole 631 is eccentrically arranged with respect to the rotation axis of the corresponding gear shaft 63, and a magnetic member 3 is disposed in the through hole 631 on each gear shaft 63. The second driving member 61 drives the internal gear 62 to rotate, and the internal gear 62 drives the multiple gear shafts 63 meshing therewith to rotate, thereby driving the magnetic member 3 disposed in the through hole 631 of the gear shaft 63 to rotate eccentrically.

[0064] The arrangement of multiple magnetic members 3 can increase the range of the magnetic field, produce a larger area of ​​flexible polishing pad 9, and thus improve the polishing efficiency. The central axis of the through hole 631 on the gear shaft 63 is eccentrically arranged with respect to the rotation center of the gear shaft 63, so that the magnetic member 3 arranged in the through hole 631 can perform eccentric rotational motion, forming a changing dynamic magnetic field. The magnetorheological polishing liquid in the liquid barrel 5 forms a dynamic flexible polishing pad 9 according to the changing magnetic field, which can promote the flow of abrasive particles in the processing area and the self-sharpening of the flexible polishing pad 9, thereby improving the processing quality and processing uniformity of the micro drill 1. In addition, multiple eccentrically rotating magnetic members 3 can further increase the range of the magnetic field, forming a larger annular flexible polishing pad 9, which can improve the processing efficiency of the micro drill 1. Of course, the installation method of the magnetic member 3 is not limited to this, and the structure of the second drive mechanism 6 is not limited to this, as long as the eccentric rotational motion of the magnetic member 3 can be achieved.

[0065] Optionally, the second driving member 61 is a second motor, and the second driving mechanism 6 further includes a second transmission assembly 64 . The second driving member 61 drives the internal gear 62 to rotate via the second transmission assembly 64 .

[0066] Specifically, if Figure 1As shown, the second transmission assembly 64 includes a second driving wheel 641, a second transmission belt 642, a second driven wheel 643, a hollow shaft 644, and a first mounting plate 645. The output end of the second driving member 61 is connected to the second driving wheel 641, the second transmission belt 642 is tensioned and wound around the second driving wheel 641 and the second driven wheel 643, the second driven wheel 643 is sleeved on the hollow shaft 644, and the hollow shaft 644 is connected to the second driven wheel 643 by a pin. The length of the pin is much smaller than the inner diameter of the hollow shaft 644, which facilitates the removal of the pin. One end of the first mounting plate 645 is connected to the end of the hollow shaft 644 away from the second driven wheel 643, and the other end of the first mounting plate 645 is connected to the internal gear 62 by screws. The screw connection facilitates the connection and disassembly of the first mounting plate 645 and the internal gear 62. Among them, in order to facilitate the flow of magnetorheological polishing liquid, a through hole is provided on the first mounting plate 645, and the magnetorheological polishing liquid can flow freely through the through hole so that the bearing assembly 2 is located in the magnetorheological polishing liquid. The process of the second driving mechanism 6 driving the internal gear 62 to drive the magnetic part 3 to rotate eccentrically is as follows: when the second driving member 61 is working, it can drive the second driving wheel 641 to rotate, and drive the second driven wheel 643 and the hollow shaft 644 to rotate through the second transmission belt 642. The rotation of the hollow shaft 644 can drive the first mounting plate 645 to rotate, thereby realizing the rotation of the internal gear 62 connected to the first mounting plate 645, and then realizing the rotation of the multiple gear shafts 63 meshing with the internal gear 62, and driving the magnetic part 3 installed on the gear shaft 63 to perform eccentric rotational motion. The structure of the second transmission mechanism 64 is not limited to this, and the transmission method and connection method are not limited to this, as long as the second driving member 61 can drive the magnetic part 3 to perform eccentric rotational motion.

[0067] Optionally, the micro drill polishing device in this embodiment also includes a base 100, which is provided with a first center hole. The hollow shaft 644 is passed through the first center hole of the base 100 and can rotate relative to it. The above-mentioned liquid barrel 5 is installed on the base 100 and fixed by screws.

[0068] Specifically, a bearing is disposed between hollow shaft 644 and the first center hole of base 100 to reduce friction generated by rotation between the hollow shaft 644 and the first center hole of base 100. Optionally, a sleeve is further disposed between the hollow shaft 644 and the first center hole of base 100 to axially limit the bearing. Hollow shaft 644 is secured to base 100 via a bearing end cap and screws. The mounting and securing method of hollow shaft 644 is not limited to this, as long as the hollow shaft 644 is securely mounted to base 100.

[0069] Optionally, the hollow shaft 644 can be sleeved outside the first rotating member 41 to save installation space. The first rotating member 41 can be mounted inside the hollow shaft 644 via a bearing and sleeve, and secured together via a bearing end cap. The specific installation method is similar to the installation method of the hollow shaft 644 and the base 100, and will not be described in detail here. Of course, in other embodiments, the first rotating member 41 and the hollow shaft 644 can also adopt other connection methods, as long as the above-mentioned assembly structure can be achieved.

[0070] In order to increase the processing range of the micro drill polishing device and enable the device to process micro drills 1 of different sizes, the distance between the magnetic part 3 and the material tray 21 in the micro drill polishing device is adjustable. Specifically, the micro drill polishing device also includes an adjustment component 8, and multiple gear shafts 63 are installed on the liquid barrel 5 through the adjustment component 8. The adjustment component 8 can be moved up and down to adjust the distance between the magnetic part 3 and the material tray 21, so that the part to be polished of the micro drill 1 extends into the magnetorheological polishing liquid and is in the appropriate position. Among them, the tooth width of the internal gear 62 needs to be long enough to ensure that the gear shaft 63 always maintains normal meshing with the internal gear 62 when adjusting the position of the magnetic part 3.

[0071] Specifically, the adjustment assembly 8 includes a second mounting plate 81 and a guide column 82. Figure 1 and Figure 6 As shown, the second mounting plate 81 is provided with a plurality of second mounting holes 811, and the plurality of gear shafts 63 are respectively disposed in the corresponding second mounting holes 811 and connected to the second mounting plate 81 via bearings. The second mounting plate 81 is also provided with a guide hole, one end of a guide post 82 is connected to the liquid barrel 5, and the other end of the guide post 82 is passed through the guide hole and slidably engaged therewith. When the second mounting plate 81 is moved to a suitable position, it is fixed by a set screw, thereby achieving adjustment and fixing of the distance between the magnetic member 3 and the material tray 21.

[0072] To allow for observation of the interior of the micro-drill polishing device when adjusting the distance between the magnetic member 3 and the material tray 21 to ensure that the magnetic member 3 is properly positioned, a second center hole 812 is also provided on the second mounting plate 81. This allows the operator to observe the polishing progress within the liquid barrel 5 and promptly address any malfunctions. Of course, the structure and connection method of the adjustment assembly 8 are not limited to this, as long as the distance between the magnetic member 3 and the material tray 21 can be adjusted.

[0073] In this embodiment, there are six gear shafts 63 and six magnetic members 3. The six gear shafts 63 are spaced apart along the circumference of the second mounting plate 81, and a magnetic member 3 is disposed within the through hole 631 of each gear shaft 63. The number and distribution of the gear shafts 63 and magnetic members 3 are not limited to this, and other numbers and distributions are also possible, as long as a uniform dynamic magnetic field can be formed.

[0074] To separate the magnetic component 3 from the magnetorheological polishing fluid and prevent the fluid from contacting and adhering to the magnetic component 3, thereby affecting the polishing process, the micro-drill polishing device further includes a retaining plate 7, which is disposed between the magnetic component 3 and the material tray 21. In this embodiment, the retaining plate 7 is formed with a receiving space, and the bottom of the gear shaft 63 is disposed within the aforementioned receiving space to separate the magnetic component 3 from the magnetorheological polishing fluid. The retaining plate 7 is secured to the sidewall of the second center hole 812 of the second mounting plate 81 via screws. In other embodiments, the retaining plate 7 may be multiple, with multiple retaining plates 7 corresponding to multiple magnetic components 3. The retaining plate 7 is formed with a barrel-shaped space, and the bottom of the gear shaft 63 is disposed within the aforementioned barrel-shaped space. Of course, the shape and mounting method of the retaining plate 7 are not limited to this, as long as the retaining plate 7 can achieve the effect of isolating the magnetic component 3 from the magnetorheological polishing fluid.

[0075] In order to prevent the micro drill bit 1 from colliding with the material stop plate 7 and causing damage to the micro drill bit 1, thereby affecting the processing quality, a limit pin 211 is further provided on the material tray 21. One end of the limit pin 211 is fixedly connected to the material tray 21, and the other end is located between the micro drill bit 1 on the material tray 21 and the material stop plate 7. If the distance between the material stop plate 7 and the micro drill bit 1 is too small, the limit pin 211 will abut against the material stop plate 7 before the micro drill bit 1, thereby protecting the micro drill bit 1. The installation position of the limit pin 211 is not limited to this, as long as it can prevent the micro drill bit 1 from colliding with other structures of the micro drill polishing device.

[0076] Example 2:

[0077] This embodiment provides a micro drill polishing method, based on the micro drill polishing device in the above embodiment 1, such as Figure 7 As shown, the following steps are included:

[0078] Step S1, inserting the part to be polished of the micro drill bit 1 into the magnetorheological polishing fluid;

[0079] Step S2: applying a magnetic field around the micro drill bit 1 to make the magnetorheological polishing fluid form a flexible polishing pad 9;

[0080] Step S3: driving the micro drill 1 to perform eccentric rotational motion to polish the micro drill 1. The viscosity of the magnetorheological polishing fluid increases under the action of the magnetic field, forming a flexible polishing pad 9 around the micro drill 1, which can achieve a better polishing effect on the micro drill 1.

[0081] Furthermore, step S2 specifically includes: starting the second driving member 61. When the second driving member 61 is working, it can drive the second driving wheel 641 to rotate, and drive the second driven wheel 643 and the hollow shaft 644 to rotate through the second transmission belt 642. The rotation of the hollow shaft 644 can drive the first mounting plate 645 to rotate, thereby realizing the rotation of the internal gear 62 connected to the first mounting plate 645, and then realizing the rotation of multiple gear shafts 63 meshing with the internal gear 62, and driving the magnetic member 3 mounted on the gear shaft 63 to perform eccentric rotational motion, forming a continuously changing dynamic magnetic field. At this time, the flexible polishing pad 9 below the magnetic member 3 also oscillates eccentrically with the dynamic magnetic field, forming a dynamic flexible polishing pad 9.

[0082] Furthermore, step S3 specifically includes: starting the first driving member 42. When the first driving member 42 is working, it can drive the first active wheel 433 to rotate, and drive the first driven wheel 431 and the first rotating member 41 to rotate through the movement of the first transmission belt 432. The first rotating member 41 drives the eccentric plate 22 to rotate through the connecting flange 23, thereby realizing the eccentric rotation of the material tray 21. On the one hand, relative movement is generated between the micro drill bit 1 and the above-mentioned dynamic annular flexible polishing pad 9. The abrasive particles 92 in the dynamic annular flexible polishing pad 9 rub the cutting edge surface of the micro drill bit 1, remove the cutting edge surface material, and improve the cutting edge surface quality; on the other hand, the eccentric rotational motion of the micro drill bit 1 enables each micro drill bit 1 to pass directly under the center of the magnetic field, which can ensure good processing uniformity.

[0083] Optionally, the above step S1 specifically includes:

[0084] Place the tray 21 containing the micro drill bit 1 into the liquid barrel 5;

[0085] Adjust the distance between the magnetic member 3 and the tray 21;

[0086] Add magnetorheological polishing fluid.

[0087] Specifically, if Figure 8 and Figure 9As shown, in this embodiment, the bottom of the micro drill bit 1 is loaded on the material tray 21, and the drill tip (i.e., the part to be polished) faces upward. Since the magnetorheological polishing fluid is usually relatively viscous, the material tray 21 containing the micro drill bit 1 is first placed in the liquid barrel 5, and the position of the magnetic part 3 is adjusted by the adjustment component 8 to adjust the distance between the micro drill bit 1 and the magnetic part 3 to achieve a better polishing effect. The distance between the micro drill bit 1 and the magnetic part 3 is preferably 0.5mm-2mm; then a sufficient amount of magnetorheological polishing fluid is added to the liquid barrel 5 so that the liquid level just covers the baffle 7, which can easily make the magnetorheological polishing fluid cover the micro drill bit 1, so that the magnetorheological polishing fluid immediately forms a flexible polishing pad 9 under the action of the magnetic field to process the cutting edge of the micro drill bit 1.

[0088] The magnetorheological polishing fluid is prepared by mixing tiny abrasive particles with a particle size of 1μm-5μm, carbonyl iron powder with a particle size of 1μm-5μm, and deionized water in a predetermined ratio. The mass fraction of the carbonyl iron powder is generally less than 40%, as excessive carbonyl iron content can impair the fluidity of the entire solution. In the magnetorheological polishing fluid, the abrasive particles 92 can be materials such as diamond, silicon carbide, aluminum oxide, silicon dioxide, and cerium oxide. The magnetic solid particles 91 can be ordinary iron powder, ferroferric oxide, and the like. The magnetorheological polishing fluid must be stirred evenly before use to avoid affecting the processing quality of the micro drill bit 1 and causing uneven processing. To prevent the abrasive particles 92 from settling and agglomerating under the action of gravity, the magnetorheological polishing fluid must remain in a fluid state even when not being processed. The stirring method can be an ultrasonic stirrer or other methods, as long as the magnetorheological polishing fluid is stirred evenly.

[0089] Optionally, the magnetorheological polishing fluid also includes an auxiliary agent. Since the magnetic solid particles 91 in the magnetorheological polishing fluid can be ordinary iron powder, an auxiliary agent such as a rust inhibitor can be added to the magnetorheological polishing fluid to prevent rusting of materials such as ordinary iron powder. Alternatively, a solvent such as silicone oil or mineral oil can be used as the base fluid.

[0090] like Figure 8 and Figure 9 As shown, under the influence of the magnetic field formed by the magnetic element 3, the magnetic solid particles 91 in the magnetorheological polishing fluid are arranged in a direction along the magnetic flux lines to form a magnetic chain. The viscosity of the magnetorheological polishing fluid increases significantly, and the fluidity decreases, forming a flexible polishing pad 9. When the micro drill bit 1 and the flexible polishing pad 9 move relative to each other, the surface of the micro drill bit 1 and the abrasive particles 92 in the magnetorheological polishing fluid rub against each other, removing the surface material of the micro drill bit 1. Under the influence of the dynamic magnetic field, the flexible polishing pad 9 is dynamic. In the dynamic flexible polishing pad 9, the magnetic solid particles 91 and the abrasive particles 92 are both fluid, which can promote the renewal of the abrasive particles 92 in the processing area and the utilization efficiency of the abrasive particles 92, thereby improving the processing quality.

[0091] Using a magnetorheological polishing fluid for polishing can polish microdrill bits 1 with complex structures, removing burrs, tiny notches, and surface damage from the cutting edge, thereby improving the processing quality and service life of the microdrill bit 1. Furthermore, the flexible polishing pad 9 formed by the magnetorheological polishing fluid under the influence of the magnetic field can control the forces acting on the microdrill bit 1 during the polishing process, preventing deformation of the microdrill bit 1 due to its inherent low rigidity.

[0092] In the description herein, it should be understood that terms such as "upper," "lower," and "right" are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the structures referred to must have a specific orientation, be constructed, or operate in a specific manner. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and do not have any special meaning.

[0093] In this specification, reference to terms such as "one embodiment" or "example" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0094] Furthermore, the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A micro drill polishing device, characterized in that: The micro drill polishing device comprises: A bearing assembly (2) for carrying the micro drill bit (1), wherein the bearing assembly (2) is configured to drive the micro drill bit (1) to rotate eccentrically; A liquid barrel (5) for containing magnetorheological polishing liquid, wherein the part to be polished of the micro drill bit (1) is in contact with the magnetorheological polishing liquid; A magnetic member (3) used for forming a magnetic field around the micro drill (1); A second driving mechanism (6) is used to drive the magnetic member (3) to rotate so as to form a dynamic magnetic field; The bearing assembly (2) comprises a material tray (21) capable of eccentric rotation, and the micro drill (1) is loaded on the material tray (21); The second driving mechanism (6) comprises a second driving member (61), an internal gear (62) and a plurality of gear shafts (63); the output end of the second driving member (61) is connected to the internal gear (62); the plurality of gear shafts (63) are all meshed with the internal gear (62); a through hole (631) is provided on the gear shaft (63); the central axis of the through hole (631) is eccentrically arranged with respect to the rotation axis of the corresponding gear shaft (63); and the magnetic member (3) is provided in the through hole (631) on each gear shaft (63); The micro drill polishing device further comprises an adjusting component (8), wherein the plurality of gear shafts (63) are mounted on the liquid barrel (5) via the adjusting component (8), and the plurality of gear shafts (63) can be moved up and down via the adjusting component (8) to adjust the distance between the magnetic member (3) and the material tray (21), and the adjusting component (8) can drive the gear shafts (63) to move up and down relative to the internal gear (62); The adjustment assembly (8) comprises a second mounting plate (81) and a guide column (82); the second mounting plate (81) is provided with a plurality of second mounting holes (811); the plurality of gear shafts (63) are respectively arranged in corresponding second mounting holes (811) and connected to the second mounting plate (81) via bearings; The second mounting plate (81) is also provided with a guide hole, one end of the guide column (82) is connected to the liquid barrel (5), and the other end of the guide column (82) is inserted into the guide hole and slidably cooperates with the guide hole.

2. The micro drill polishing device according to claim 1, characterized in that: It also comprises a first driving mechanism (4), the output end of the first driving mechanism (4) is connected to the material tray (21), and the first driving mechanism (4) is configured to drive the material tray (21) to rotate eccentrically.

3. The micro drill polishing device according to claim 2, characterized in that: The first driving mechanism (4) comprises a first rotating member (41) and a first driving member (42); the output end of the first driving member (42) is connected to one end of the first rotating member (41); the other end of the first rotating member (41) is connected to the material tray (21); the rotation axis of the first rotating member (41) does not coincide with the central axis of the material tray (21), so that the first driving member (42) can drive the material tray (21) to perform eccentric rotational motion through the first rotating member (41).

4. The micro drill polishing device according to claim 1, characterized in that: The material tray (21) is capable of loading a plurality of the micro drill bits (1).

5. A micro drill polishing method based on the micro drill polishing device according to any one of claims 1 to 4, characterized in that: The steps include: Step S1, inserting the part to be polished of the micro drill bit (1) into the magnetorheological polishing liquid; Step S2, applying a magnetic field around the micro drill bit (1) so that the magnetorheological polishing fluid forms a flexible polishing pad (9); Step S3, driving the micro drill bit (1) to perform eccentric rotational motion to polish the micro drill bit (1), wherein the eccentric rotational motion of the micro drill bit (1) enables each micro drill bit (1) to pass directly below the center of the magnetic field.

6. The micro drill polishing method according to claim 5, characterized in that: The step S1 specifically comprises: placing the material tray (21) containing the micro drill bit (1) into a liquid barrel (5); Adjusting the distance between the magnetic member (3) and the material tray (21); The magnetorheological polishing fluid is added.

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