CN212444368U - Micro drill polishing device - Google Patents

Abstract

The utility model relates to a micro drill polishing processing field discloses a micro drill burnishing device, including carrier assembly, liquid bucket and magnetic part, carrier assembly is used for loading micro drill, and this carrier assembly is configured to drive micro drill eccentric rotation, and the liquid bucket is used for splendid attire magnetic current to become the polishing solution, and micro drill's the polishing part of treating contacts with magnetic current becomes the polishing solution, and the magnetic part is used for forming magnetic field around micro drill. The utility model provides a micro drill bit burnishing device can realize getting rid of blade surface burr and small breach to the polishing of micro drill bit blade, improves micro drill bit's processingquality and life.

Description

Micro drill polishing device

Technical Field

The utility model relates to a micro drill polishing processing field especially relates to a micro drill burnishing device.

Background

With the rapid development of the hard circuit board industry, the requirements on the micro drill used in the hard circuit board processing process are higher and higher, the diameter of the micro drill is usually less than 0.3mm, and the processing requirements include the material, structure, surface roughness, integrity of the cutting edge and the like of the drill. At present this type of micro drill all forms through consolidation grinding wheel grinding, and the blade department at the drill bit can produce surface defects such as burr, breach unavoidably, and these defects can accelerate the wearing and tearing in the drill bit use, seriously influence the life of drill bit, and micro drill's blade is too sharp-pointed simultaneously, and blade circular arc radius is less, appears the whole bursting apart of blade when easily leading to using. Therefore, the micro-drill needs to be polished after being ground by the consolidation grinding wheel, so as to obtain the micro-drill with smooth surface and high cutting edge processing quality. However, because the diameter of the micro-drill is too small, the surface of the cutting edge of the micro-drill is difficult to polish in a fixed abrasive particle grinding mode such as a grinding wheel, an abrasive belt and the like, and the existing micro-drill has poor processing quality.

Therefore, there is a need for a micro drill polishing device to improve the quality of the micro drill cutting edge, so as to improve the quality and the service life of the micro drill.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a micro drill polishing device to realize the polishing of micro drill blade, improve micro drill processingquality and life.

Therefore, the utility model adopts the following technical scheme:

a micro drill polishing apparatus, comprising:

the bearing assembly is used for loading the micro-drill and is configured to drive the micro-drill to rotate eccentrically;

the liquid barrel is used for containing magnetorheological polishing liquid, and a part to be polished of the micro drill bit is contacted with the magnetorheological polishing liquid;

and a magnetic member for forming a magnetic field around the micro drill.

Preferably, the bearing component comprises a material tray capable of eccentrically rotating, and the micro-drill is loaded on the material tray.

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

Preferably, the first driving mechanism comprises a first rotating part and a first driving part, the output end of the first driving part is connected with one end of the first rotating part, the other end of the first rotating part is connected with the material tray, and the rotation axis of the first rotating part is not coincident with the central axis of the material tray, so that the first driving part can drive the material tray to do eccentric rotation motion through the first rotating part.

Preferably, the micro-bit polishing device further comprises a second driving mechanism for driving the magnetic member to rotate so as to form a moving magnetic field.

Preferably, the second driving mechanism comprises a second driving part, an internal gear and a plurality of gear shafts, the output end of the second driving part is connected with the internal gear, the gear shafts are all meshed with the internal gear, through holes are formed in the gear shafts, the central axes of the through holes are eccentrically arranged with the rotation axes of the corresponding gear shafts, and a magnetic part is arranged in each through hole in each gear shaft.

Preferably, the distance between the magnetic part and the material tray is adjustable.

Preferably, the micro-bit polishing device further comprises a material baffle plate, and the material baffle plate is arranged between the magnetic part and the material tray.

Preferably, the material tray is further provided with a limiting pin, and the top of the limiting pin is located between the material baffle and the micro drill bit on the material tray.

Preferably, the magazine is capable of carrying a plurality of micro-drills.

The utility model has the advantages that:

the utility model provides a micro-drill polishing device, which comprises a bearing component, a liquid barrel and a magnetic part, wherein the bearing component is used for loading a micro-drill, and the bearing component is configured to drive the micro-drill to eccentrically rotate; the liquid barrel is used for containing magnetorheological polishing liquid, a part to be polished of the micro drill bit is in contact with the magnetorheological polishing liquid, the magnetorheological polishing liquid is used for forming a flexible polishing pad to polish the micro drill bit, and meanwhile, the polishing acting force is controlled to prevent the micro drill bit from deforming and breaking under stress; the magnetic part is used for forming a magnetic field around the micro-drill, the magnetorheological polishing liquid forms a flexible polishing pad under the action of the magnetic field, the micro-drill and the flexible polishing pad can form relative motion through eccentric rotation of the micro-drill, so that the micro-drill is polished, and meanwhile, the micro-drill passes through the center of the magnetic field, so that the polishing quality of the micro-drill is improved. This micro drill bit burnishing device can realize getting rid of blade surface burr, small breach and sub-surface damage layer to the minimum micro drill bit blade that just has complex structure of diameter, reduces blade roughness, increases blade circular arc radius, and then reduces the speed of blade wearing and tearing during drill bit drilling processing, improves micro drill bit's life and drilling quality.

Drawings

FIG. 1 is a schematic structural view of a micro drill polishing device provided by the present invention;

FIG. 2 is a cross-sectional view of an eccentric plate provided by the present invention;

FIG. 3 is a top view of the eccentric plate provided by the present invention;

fig. 4 is a sectional view of a gear shaft provided by the present invention;

fig. 5 is a top view of a gear shaft provided by the present invention;

FIG. 6 is an assembly view of the adjustment assembly and gear shaft provided by the present invention;

FIG. 7 is a flow chart of a method of micro-bit polishing provided by the present invention;

FIG. 8 is a schematic view of a micro-bit polishing method provided by the present invention;

FIG. 9 is a schematic diagram of the interaction between the microbit and the magnetorheological polishing fluid provided by the present invention.

In the figure:

1. a micro-drill;

2. a load bearing assembly; 21. a material tray; 211. a spacing pin; 212. a charging tray foot; 22. an eccentric plate; 221. a first mounting hole; 23. a connecting flange;

3. a magnetic member;

4. a first drive mechanism; 41. a first rotating member; 42. a first driving member;

43. a first transmission assembly; 431. a first driven wheel; 432. a first drive belt; 433. a first drive wheel;

5. a liquid barrel;

6. a second drive mechanism; 61. a second driving member; 62. an internal gear; 63. a gear shaft; 631. a through hole;

64. a second transmission assembly; 641. a second drive wheel; 642. a second belt; 643. a second driven wheel; 644. a hollow shaft; 645. a first mounting plate;

7. a striker plate;

8. an adjustment assembly; 81. a second mounting plate; 811. a second mounting hole; 812. a second central aperture; 82. a guide post;

9. a flexible polishing pad; 91. magnetic solid-state particles; 92. abrasive particles;

100. a base.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

The present embodiment provides a micro drill polishing apparatus, as shown in fig. 1, which includes a carrier assembly 2, a liquid tank 5, and a magnetic member 3. The bearing component 2 is used for loading the micro-drilling bit 1, and the bearing component 2 is configured to drive the micro-drilling bit 1 to eccentrically rotate; the liquid barrel 5 is filled with magnetorheological polishing liquid, a part to be polished of the micro-drill 1 extends into the magnetorheological polishing liquid, the magnetorheological polishing liquid is used for forming a flexible polishing pad 9 to polish the micro-drill 1, and meanwhile, the flexible polishing pad 9 can control acting force applied to the micro-drill 1 in the machining process, so that the micro-drill 1 is prevented from being stressed, deformed and damaged. The magnetic member 3 is used to form a magnetic field around the micro-drill 1, thereby allowing the magnetorheological polishing fluid to form a flexible polishing pad 9. Under the action of a magnetic field, the magnetorheological polishing solution immediately forms a high-viscosity low-fluidity binham elastomer due to the magnetorheological effect, and is called a flexible polishing pad in the specification. This micro drill bit burnishing device can realize getting rid of blade surface burr, small breach and sub-surface damage layer to the polishing of 1 blade of micro drill bit that has minimum diameter and complex structure, improves micro drill bit 1's surface quality, and then improves micro drill bit 1's life.

Optionally, the carrier assembly 2 comprises a tray 21 capable of eccentric rotation, and the micro-drill 1 is loaded on the tray 21. Specifically, a clamp is arranged on the tray 21, and the micro-drill 1 is loaded on the tray 21 through the clamp and is driven by the tray 21 to eccentrically rotate.

Further, the tray 21 can be loaded with a plurality of the micro drills 1, and the micro drills 1 can be loaded at a time to improve the polishing efficiency of the micro drills 1. In this embodiment, a plurality of micro drill bit groups are loaded on the tray 21, the micro drill bit groups are distributed along the circumferential direction of the tray 21 at intervals, each micro drill bit group comprises a plurality of micro drill bits 1, and the micro drill bits 1 are arranged along the radial direction of the tray 21 at intervals, so that the micro drill bits 1 on the tray 21 are distributed radially around the center of the tray 21.

In order to drive the micro-drill 1 to rotate, the micro-drill 1 and the flexible polishing pad 9 form a relative motion, so as to polish the micro-drill 1, the micro-drill polishing device further comprises a first driving mechanism 4, an output end of the first driving mechanism 4 is connected with the material tray 21, and the first driving mechanism 4 is configured to drive the material tray 21 to eccentrically rotate, so as to drive the micro-drill 1 to eccentrically rotate.

Specifically, the first driving mechanism 4 includes a first rotating member 41 and a first driving member 42, an 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 tray 21, and a rotation axis of the first rotating member 41 is not coincident with a central axis of the tray 21, so that the first driving member 42 can drive the tray 21 to perform an eccentric rotation motion through the first rotating member 41, and the micro-drill 1 and the flexible polishing pad 9 formed by the magnetorheological polishing solution have a relative motion therebetween. In addition, in the embodiment, the charging tray 21 is loaded with a plurality of micro-drills 1, and each micro-drill 1 can pass through the central area of the magnetic field through the eccentric motion of the charging tray 21, so that the processing uniformity of the polishing of the cutting edge of the micro-drill 1 can be improved.

In this embodiment, the bearing assembly 2 is disposed in the liquid barrel 5, the bottom of the micro-drill 1 is mounted on the tray 21, the portion of the micro-drill 1 to be polished faces upward, the micro-drill 1 is immersed in the magnetorheological polishing liquid, and the magnetic member 3 is disposed above the micro-drill 1. The micro drill bit 1 is arranged with the part to be polished facing upwards, so that the micro drill bit 1 can be conveniently loaded, the design of a clamp on the material tray 21 can be simplified, the clamping force is controlled, and the deformation and damage of the micro drill bit 1 caused by overlarge clamping force are avoided. Of course, the loading manner of the micro drill 1 and the positional relationship among the micro drill 1, the bearing assembly 2 and the magnetic member 3 are not limited to this, as long as the above-mentioned portion to be processed of the micro drill 1 is extended into the magnetorheological polishing liquid and a magnetic field is formed around the micro drill 1.

Optionally, in order to realize the eccentric rotation motion of the charging tray 21, the carrier assembly 2 further includes an eccentric plate 22 and a connecting flange 23, the charging tray 21 is mounted on the eccentric plate 22, the eccentric plate 22 is connected to the first rotating member 41 through the connecting flange 23, a central axis of the eccentric plate 22 is not coincident with a rotation center of the first rotating member 41, and the first rotating member 41 can drive the eccentric plate 22 to eccentrically rotate and drive the charging tray 21 to eccentrically rotate.

Optionally, in order to facilitate the accurate installation of the tray 21 on the eccentric plate 22, as shown in fig. 1 to 3, tray legs 212 are provided on the tray 21, first installation holes 221 are provided on the eccentric plate 22 corresponding to the tray legs 212, and the tray legs 212 can cooperate with the first installation holes 221 to realize the positioning and connection between the tray 21 and the eccentric plate 22. In addition, the eccentric plate 22 is fixed with the connecting flange 23 through a screw, the connecting flange 23 is fixed with the first rotating part 41 through a fastening nut, and the threaded connection has the advantages of being simple to process and convenient to disassemble and assemble. Of course, the connection method between the tray 21 and the first rotating member 41 is not limited to this, and other connection methods may be used as long as the center axis of the tray 21 and the rotation center of the first rotating member 41 do not coincide with each other, and the first rotating member 41 can drive the tray 21 to perform eccentric rotation. Similarly, the fixing manner of the eccentric plate 22 and the connecting flange 23, and the connecting flange 23 and the first rotating member 41 are not limited to this, as long as the above-described connecting function can be achieved.

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, and the first driving member 42 drives the first rotating member 41 to rotate through the first transmission assembly 43.

Specifically, the first transmission assembly 43 includes a first driven wheel 431, a first transmission belt 432 and a first driving wheel 433, the output end of the first driving member 42 is connected to the first driving wheel 433, the first transmission belt 432 is tightly wound around the first driving wheel 433 and the first driven wheel 431, the first driving wheel 433 inputs power to the first driven wheel 431 through the first transmission belt 432, and the output end of the first driven wheel 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 works, the first driving wheel 433 can be driven to rotate, the first driven wheel 431 and the first rotating member 41 are driven to rotate by the movement of the first transmission belt 432, and the first rotating member 41 drives the eccentric plate 22 to rotate by the connecting flange 23, so that the eccentric rotation of the tray 21 is realized. The first driving mechanism 4 is simple in structure, stable in transmission and accurate in transmission, and can achieve better control over the material disc 21.

In order to promote the flow of abrasive particles in the magnetorheological polishing solution and improve the utilization efficiency of the abrasive particles, the micro-drill polishing device further comprises a second driving mechanism 6, the second driving mechanism drives the magnetic part 3 to rotate to form a dynamic magnetic field, the distribution of magnetic induction lines in the dynamic magnetic field is changed at any moment, the magnetorheological polishing solution forms a dynamic flexible polishing pad 9 under the action of the dynamic magnetic field, the dynamic flexible polishing pad 9 can move and turn over, particle clusters in the flexible polishing pad 9 continuously flow, and the update of the particle clusters in a processing area and the self-sharpening of the flexible polishing pad 9 are promoted.

Further, the second driving mechanism 6 includes a second driver 61, an internal gear 62, and a plurality of gear shafts 63, an output end of the second driver 61 is connected with the internal gear 62, the plurality of gear shafts 63 are all engaged with the internal gear 62, through holes 631 are provided on the gear shafts 63, as shown in fig. 4 and 5, central axes of the through holes 631 are eccentrically provided with the rotation axes of the corresponding gear shafts 63, and the magnetic members 3 are provided in the through holes 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 plurality of gear shafts 63 engaged therewith to rotate, so as to drive the magnetic members 3 disposed in the through holes 631 of the gear shafts 63 to eccentrically rotate.

The arrangement of the plurality of magnetic members 3 can increase the magnetic field range, resulting in a larger area of the flexible polishing pad 9, thereby improving polishing efficiency. The central axis of the through hole 631 on the gear shaft 63 and the rotation center of the gear shaft 63 are eccentrically arranged, so that the magnetic member 3 arranged in the through hole 631 can perform eccentric rotation to form a changing dynamic magnetic field, and the magnetorheological polishing liquid in the liquid barrel 5 forms a dynamic flexible polishing pad 9 according to the changing magnetic field, thereby promoting the flow of abrasive particles in a processing area and the self-sharpening of the flexible polishing pad 9, and improving the processing quality and the processing uniformity of the micro-drill 1. In addition, the plurality of eccentrically rotating magnetic members 3 may further increase the range of the magnetic field, form a larger annular flexible polishing pad 9, and may improve the processing efficiency of the micro drill 1. Of course, the mounting manner of the magnetic material 3 is not limited to this, and the structure of the second driving mechanism 6 is not limited to this, as long as the eccentric rotation motion of the magnetic material 3 can be achieved.

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

Specifically, as shown in fig. 1, 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 element 61 is connected to the second driving wheel 641, the second transmission belt 642 is tightly 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 through a pin. Wherein the length of the pin is much less than the inner diameter of the hollow shaft 644 to facilitate removal of the pin. One end of the first mounting plate 645 is connected to an end of the hollow shaft 644 remote from the second driven wheel 643, and the other end of the first mounting plate 645 is connected to the inner gear 62 by screws, which facilitate the connection and disconnection of the first mounting plate 645 and the inner gear 62. In order to facilitate the flow of the magnetorheological polishing liquid, the first mounting plate 645 is provided with through holes, and the magnetorheological polishing liquid can freely flow through the through holes, so that the bearing assembly 2 is located in the magnetorheological polishing liquid. The process that the second driving mechanism 6 drives the internal gear 62 to drive the magnetic part 3 to eccentrically rotate is as follows: when the second driving element 61 works, the second driving wheel 641 can be driven to rotate, the second driven wheel 643 and the hollow shaft 644 are driven to rotate through the second transmission belt 642, and the rotation of the hollow shaft 644 can drive the first mounting plate 645 to rotate, so that the internal gear 62 connected with the first mounting plate 645 rotates, the rotation of the plurality of gear shafts 63 engaged with the internal gear 62 is realized, and the magnetic element 3 mounted on the gear shaft 63 is driven to perform eccentric rotation motion. The structure of the second transmission mechanism 64 is not limited to this, and the transmission manner and the connection manner are not limited to this, as long as the second driving member 61 can drive the magnetic member 3 to perform the eccentric rotation motion.

Optionally, the micro-drill polishing apparatus in this embodiment further includes a base 100, the base 100 is provided with a first central hole, the hollow shaft 644 is disposed in the first central hole of the base 100 and can rotate relative to the first central hole, and the liquid barrel 5 is mounted on the base 100 and fixed by a screw.

Specifically, a bearing is disposed between the hollow shaft 644 and the first central bore of the base 100 to reduce friction generated by rotation between the hollow shaft 644 and the first central bore of the base 100. Optionally, a bushing is further disposed between the hollow shaft 644 and the first central hole of the base 100 for axial limitation of the bearing. The hollow shaft 644 is fixed to the base 100 by a bearing end cap and screws. The mounting and fixing manner of the hollow shaft 644 is not limited thereto as long as the hollow shaft 644 can be fixedly mounted to the base 100.

Optionally, the hollow shaft 644 is sleeved outside the first rotating member 41, so as to save installation space. The first rotating member 41 may be mounted inside the hollow shaft 644 through a bearing and a sleeve, and fixed together through a bearing end cover in the same way as the hollow shaft 644 and the base 100, which will not be described in detail herein. Of course, in other embodiments, the first rotating member 41 and the hollow shaft 644 may be connected in other manners as long as the above-mentioned assembling structure can be realized.

In order to increase the processing range of the micro-drill polishing device, the device can process micro-drills 1 with different sizes, and 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 comprises an adjusting component 8, wherein a plurality of gear shafts 63 are arranged on the liquid barrel 5 through the adjusting component 8 and can move up and down through the adjusting component 8, so that the distance between the magnetic part 3 and the material tray 21 can be adjusted, and the part to be polished of the micro-drill 1 extends into the magnetorheological polishing liquid and is in a proper position. Wherein, the tooth width of the internal gear 62 is long enough to ensure that the gear shaft 63 always keeps normal meshing with the internal gear 62 when the position of the magnetic member 3 is adjusted.

Specifically, the adjusting assembly 8 includes a second mounting plate 81 and a guide post 82, as shown in fig. 1 and 6, a plurality of second mounting holes 811 are provided on the second mounting plate 81, 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 through bearings. Still be provided with the guiding hole on the second mounting panel 81, the one end of guide post 82 is connected on liquid bucket 5, and the other end of guide post 82 wears to locate in the guiding hole and rather than sliding fit, and when second mounting panel 81 removed suitable position, fixes through holding screw to realize the regulation and the fixing of distance between magnetic part 3 and the charging tray 21.

In order to realize that the interior of the micro-drill polishing device can be observed when the distance between the magnetic member 3 and the tray 21 is adjusted to ensure that the magnetic member 3 is in a proper position, the second mounting plate 81 is further provided with a second central hole 812. The operator can observe the polishing condition inside the liquid barrel 5 through the second center hole 812 and deal with it in time when a failure occurs. Of course, the structure and connection manner of the adjusting assembly 8 are not limited to this, as long as the distance between the magnetic member 3 and the tray 21 can be adjusted.

In the present embodiment, the number of the gear shafts 63 and the magnetic members 3 is six, the six gear shafts 63 are spaced apart along the circumferential direction of the second mounting plate 81, and the magnetic members 3 are disposed in the through holes 631 of each gear shaft 63. The number and distribution of the gear shaft 63 and the magnetic members 3 are not limited to this, and other numbers and distributions may be used as long as a uniform moving magnetic field can be formed.

In order to separate the magnetic part 3 from the magnetorheological polishing solution and prevent the magnetorheological polishing solution from contacting the magnetic part 3 and further attaching to the magnetic part 3 to affect polishing, the micro-drill polishing device further comprises a baffle plate 7, and the baffle plate 7 is arranged between the magnetic part 3 and the material tray 21. In the embodiment, the striker plate 7 is formed with an accommodating space, and the bottom of the gear shaft 63 is disposed in the accommodating space to separate the magnetic member 3 from the magnetorheological polishing liquid. The striker plate 7 is fixed to the side wall of the second center hole 812 of the second mounting plate 81 by screws. In other embodiments, the number of the striker plates 7 may be multiple, the striker plates 7 and the magnetic members 3 are arranged in a one-to-one correspondence, a barrel-shaped space is formed on the striker plates 7, and the bottoms of the gear shafts 63 are respectively arranged in the barrel-shaped space. Of course, the shape and installation manner of the striker plate 7 are not limited thereto, as long as the effect of isolating the magnetic member 3 from the magnetorheological polishing fluid can be achieved.

In order to prevent the damage of the micro-drill 1 caused by the collision between the micro-drill 1 and the material baffle 7 from affecting the processing quality, a limiting pin 211 is further arranged on the material tray 21, one end of the limiting pin 211 is fixedly connected to the material tray 21, the other end of the limiting pin is positioned between the micro-drill 1 and the material baffle 7 on the material tray 21, once the distance between the material baffle 7 and the micro-drill 1 is too small, the limiting pin 211 abuts against the material baffle 7 before the micro-drill 1, and therefore the micro-drill 1 is protected. The installation position of the stopper pin 211 is not limited thereto as long as the micro-drill 1 can be prevented from colliding with other structures of the micro-drill polishing apparatus.

The embodiment also provides a micro drill polishing method, based on the micro drill polishing device, as shown in fig. 7, including the following steps:

step S1, extending the part to be polished of the micro drill bit 1 into the magneto-rheological polishing liquid;

step S2, applying a magnetic field around the micro-drill 1 to enable the magnetorheological polishing solution to form a flexible polishing pad 9;

step S3, the micro drill 1 is driven to perform eccentric rotation to polish the micro drill 1. The magnetorheological polishing solution increases in viscosity under the action of the magnetic field, and a flexible polishing pad 9 is formed around the micro-drill 1, so that a good polishing effect can be achieved on the micro-drill 1.

Further, step S2 specifically includes: when the second driving element 61 is started, when the second driving element 61 works, the second driving wheel 641 can be driven to rotate, the second driven wheel 643 and the hollow shaft 644 are driven to rotate through the second transmission belt 642, the hollow shaft 644 can drive the first mounting plate 645 to rotate, so that the internal gear 62 connected with the first mounting plate 645 rotates, the plurality of gear shafts 63 meshed with the internal gear 62 rotate, the magnetic elements 3 mounted on the gear shafts 63 are driven to do eccentric rotation, and a constantly changing dynamic magnetic field is formed. At this time, the flexible polishing pad 9 under the magnetic member 3 also swings eccentrically with the dynamic magnetic field, forming a dynamic flexible polishing pad 9.

Further, step S3 specifically includes: starting the first driving part 42, when the first driving part 42 works, the first driving wheel 433 can be driven to rotate, the first driven wheel 431 and the first rotating part 41 are driven to rotate by the movement of the first transmission belt 432, the eccentric plate 22 is driven to rotate by the first rotating part 41 through the connecting flange 23, so that the eccentric rotation of the material tray 21 is realized, on one hand, the micro drill bit 1 and the dynamic annular flexible polishing pad 9 generate relative motion, the abrasive particles 92 in the dynamic annular flexible polishing pad 9 rub the cutting edge surface of the micro drill bit 1, the cutting edge surface material is removed, and the quality of the cutting edge surface is improved; on the other hand, the eccentric rotation motion of the micro drill bits 1 enables each micro drill bit 1 to pass right below the center of the magnetic field, and good processing uniformity can be guaranteed.

Optionally, step S1 specifically includes:

putting the material tray 21 with the micro-drill 1 into the liquid barrel 5;

adjusting the distance between the magnetic part 3 and the material tray 21;

adding magnetorheological polishing solution.

Specifically, as shown in fig. 8 and fig. 9, in the present embodiment, the bottom of the micro drill 1 is loaded on the tray 21, the drill point (i.e. the part to be polished) is upward, since the magnetorheological polishing fluid is usually viscous, the tray 21 with the micro drill 1 is first placed in the liquid barrel 5, the position of the magnetic member 3 is adjusted by the adjusting assembly 8 so as to adjust the distance between the micro drill 1 and the magnetic member 3, so as to achieve a better polishing effect, and the distance between the micro drill 1 and the magnetic member 3 is preferably 0.5mm-2 mm; and then sufficient magnetorheological polishing solution is added into the liquid barrel 5, so that the liquid level just submerges the baffle plate 7, the magnetorheological polishing solution can conveniently submerge the micro-drill 1, and the magnetorheological polishing solution immediately forms a flexible polishing pad 9 under the action of a magnetic field to process the cutting edge of the micro-drill 1.

The preparation method of the magnetorheological polishing solution comprises the step of mixing the micro abrasive particles with the particle size of 1-5 mu m, the carbonyl iron powder with the particle size of 1-5 mu m and deionized water according to a preset proportion, wherein the mass fraction of the carbonyl iron powder is generally lower than 40%, and the flowability of the whole solution is deteriorated due to the fact that the content of the carbonyl iron powder is too high. In the magnetorheological polishing solution, the abrasive particles 92 can be diamond, silicon carbide, alumina, silica, cerium oxide, or the like. The magnetic solid particles 91 may be ordinary iron powder, ferroferric oxide, or the like. The magnetorheological polishing solution needs to be uniformly stirred for use, so that the influence on the processing quality and the processing unevenness of the micro-drill 1 are avoided. In order to prevent the abrasive particles 92 from settling and agglomerating under the action of gravity, the magnetorheological polishing solution is in a flowing state when not being processed. The stirring mode can be an ultrasonic stirrer or other modes, and the magnetorheological polishing solution can be stirred uniformly.

Optionally, the magnetorheological polishing fluid further comprises an auxiliary agent. Because the magnetic solid particles 91 in the magnetorheological polishing fluid can be ordinary iron powder, in order to avoid rusting of materials such as ordinary iron powder, an auxiliary agent such as an antirust agent can be added into the magnetorheological polishing fluid. In addition, a solvent such as silicone oil or mineral oil may be used as the base liquid.

As shown in fig. 8 and 9, under the action of the magnetic field formed by the magnetic member 3, the magnetic solid particles 91 in the magnetorheological polishing solution are directionally arranged along the direction of the magnetic induction line to form a magnetic chain string, the viscosity of the magnetorheological polishing solution is significantly increased, the fluidity is reduced, and the flexible polishing pad 9 is formed, when the micro-drill 1 and the flexible polishing pad 9 move relatively, the surface of the micro-drill 1 and the abrasive particles 92 in the magnetorheological polishing solution rub against each other, and the surface material of the micro-drill 1 is removed. The flexible polishing pad 9 is dynamic under the action of the dynamic magnetic field. In the dynamic flexible polishing pad 9, the magnetic solid particles 91 and the abrasive grains 92 are both fluid, and therefore, the update of the abrasive grains 92 in the processing region and the utilization efficiency of the abrasive grains 92 can be promoted, and the processing quality can be improved.

The magnetorheological polishing solution is adopted for polishing, so that the micro drill bit 1 with a complex structure can be polished, burrs, micro gaps and surface damage layers on the surface of a cutting edge can be removed, the processing quality of the micro drill bit 1 is improved, and the service life of the micro drill bit is prolonged. In addition, the flexible polishing pad 9 formed by the magnetorheological polishing solution under the action of the magnetic field can control the acting force on the micro-drill 1 in the polishing process, and prevent the micro-drill 1 from deforming under the action of external force due to smaller self rigidity.

In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are used in the orientation and positional relationship shown in the drawings, and are used for convenience of description and simplicity of operation, but do not indicate or imply that the structures referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. A micro drill polishing apparatus, characterized in that the micro drill polishing apparatus comprises:

a bearing component (2) used for loading the micro-drilling bit (1), wherein the bearing component (2) is configured to drive the micro-drilling bit (1) to rotate eccentrically;

the liquid barrel (5) is used for containing magnetorheological polishing liquid, and a part to be polished of the micro drill bit (1) is in contact with the magnetorheological polishing liquid;

a magnetic member (3) for forming a magnetic field around the micro drill (1).

2. The micro-drill polishing device according to claim 1, characterized in that the carrier assembly (2) comprises a tray (21) capable of eccentric rotation, the micro-drill (1) being loaded on the tray (21).

3. The microbit polishing apparatus according to claim 2, further comprising a first driving mechanism (4), an output end of the first driving mechanism (4) being connected to the tray (21), the first driving mechanism (4) being configured to drive the tray (21) to rotate eccentrically.

4. The microbit polishing apparatus according to claim 3, wherein the first driving mechanism (4) comprises a first rotating member (41) and a first driving member (42), an output end of the first driving member (42) is connected with one end of the first rotating member (41), the other end of the first rotating member (41) is connected with the tray (21), and a rotation axis of the first rotating member (41) is not coincident with a central axis of the tray (21), so that the first driving member (42) can drive the tray (21) to perform eccentric rotation movement through the first rotating member (41).

5. The microbit polishing apparatus according to claim 1, further comprising a second driving mechanism (6) for driving the magnetic member (3) to rotate to form a moving magnetic field.

6. The micro-drill polishing device according to claim 5, wherein 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 with the internal gear (62), the plurality of gear shafts (63) are all meshed with the internal gear (62), through holes (631) are arranged on the gear shafts (63), the central axes of the through holes (631) are eccentrically arranged with the corresponding rotation axes of the gear shafts (63), and the magnetic member (3) is arranged in the through hole (631) on each gear shaft (63).

7. The micro-drill polishing device according to claim 2, characterized in that the distance between the magnetic member (3) and the tray (21) is adjustable.

8. The microbit polishing device according to claim 7, characterized in that, further comprises a striker plate (7), the striker plate (7) is disposed between the magnetic member (3) and the tray (21).

9. The microbit polishing device according to claim 8, characterized in that a limit pin (211) is further disposed on the tray (21), and the top of the limit pin (211) is located between the striker plate (7) and the microbit (1) on the tray (21).

10. The micro-drill polishing device according to claim 2, characterized in that the tray (21) is capable of carrying a plurality of micro-drills (1).

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