A precision medical rotary grinding head sanding device and rotary grinding head electroplating preparation process

Abstract

The application discloses a precision medical rotary grinding head sanding device and an electroplating preparation process, and belongs to the technical field of superhard grinding tools. The sanding device comprises a roller jig, and a plurality of strip-shaped sanding assemblies are arranged on the circumferential side wall of the roller jig; the sanding assembly comprises a conductive wire, a rotary grinding head and a conductive tube are alternately arranged on the conductive wire in sequence, the end faces of the rotary grinding head and the conductive tube are abutted, and an elastic tube is filled between the inner hole of the rotary grinding head and the conductive wire; the two ends of the conductive wire are detachably connected to the roller jig through auxiliary cathode seats. The electroplating preparation process utilizes the above device, and is prepared through the steps of pipe penetration, alternate assembly, pretreatment, large-current pre-plating of a nickel bottom, sand planting by a suspension method, and chemical nickel rotary sand fixing. The application effectively solves the problems of diameter reduction caused by poor sealing of the inner hole of the rotary grinding head during electroplating, end face adhesion and sanding defects, and poor consistency of the blade height of a batch of electroplated abrasive layers, and improves the product assembly precision, yield and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of superhard abrasive technology, and in particular to a sanding device for a precision medical rotary grinding head and a rotary grinding head electroplating preparation process. Background Technology

[0002] Rotary atherectomy (also known as a rotary burr) is a key component in treating severe coronary artery calcification. Its surface is inlaid with diamond particles, and it is generally olive-shaped with a diameter typically ≤1.5mm, facilitating manipulation within the blood vessel. Driven by a motor, the burr rotates at a high speed of hundreds of thousands of revolutions per minute. Guided by a guidewire, the burr enters the patient's coronary artery, precisely abrading the calcified plaque through a combination of rotation and revolution. Existing rotary burrs are divided into two types: concentric rotary burrs with an ellipsoidal shape and eccentrically mounted rotary burrs.

[0003] Chinese invention patent CN114016091A discloses a manufacturing method and apparatus for a drive shaft of an intervening rotary grinding device. The manufacturing method includes: firstly, placing the portion of the flexible shaft with the electroplated section in an electroplating bath containing nickel ion electroplating solution for a first electroplating to form a first electroplated layer; then placing the portion of the flexible shaft with the electroplated section in an abrasive tank in the electroplating bath for a second electroplating to form a second electroplated layer on the surface of the flexible shaft; finally, grinding the second electroplated layer to form a rotary grinding layer with abrasive grains on the flexible shaft; wherein the abrasive tank contains abrasive grains, and the tank wall allows the electroplating solution to pass through while blocking the abrasive grains.

[0004] The purpose of this invention is to reduce the amount of abrasive used and improve the reliability of the connection between the abrasive and the flexible shaft. However, in the processing scenario of rotary grinding heads, due to the small size of the rotary grinding heads, multiple rotary grinding heads need to be sanded at one time. Clamping the rotary grinding heads one by one and then electroplating and sanding them will greatly reduce production efficiency. The existing rotary grinding heads still have the following problems in the electroplating and sanding production process:

[0005] 1. Poor sealing of the inner hole leads to a smaller inner hole diameter: In traditional processes, the inner hole of the rotary grinding head is easily covered by the plating layer during electroplating, resulting in a smaller inner hole size, which affects the subsequent fitting accuracy with the drive guide wire.

[0006] 2: End face adhesion and missing abrasive: During electroplating, the end face of the rotary grinding head is prone to adhesion with adjacent parts, resulting in missing pieces or missing abrasive layer on the end face of the rotary grinding head when it is removed.

[0007] 3. Poor uniformity of abrasive layer exit height in batch electroplating: Due to the small size of the swirl head, it is difficult to uniformly control the electric field distribution and abrasive suspension state during batch electroplating, resulting in poor uniformity of abrasive layer exit height, which affects the swirl grinding effect and service life. Summary of the Invention

[0008] To address the shortcomings in the aforementioned background technology, this invention proposes a sanding device for a precision medical rotary burr head and an electroplating preparation process for the rotary burr head, which solves the problems in the prior art such as poor sealing of the inner hole of the electroplated precision medical rotary burr head, resulting in a smaller inner hole diameter, and poor consistency of the blade height of the batch electroplated abrasive layer.

[0009] The technical solution of this invention is implemented as follows:

[0010] A precision medical rotary burr head sanding device includes a roller-type fixture. The circumferential sidewall of the roller-type fixture is provided with several strip-shaped sanding components. The length direction of the sanding components is parallel to the axis of the roller-type fixture. Each sanding component includes a conductive wire, on which several rotary burrs and conductive tubes are alternately arranged in sequence. The end faces of the rotary burrs and conductive tubes abut against each other. An elastic tube is filled between the inner hole of the rotary burr head and the conductive wire. Both ends of the conductive wire are respectively connected to an auxiliary cathode seat and are detachably connected to the roller-type fixture through the auxiliary cathode seat. By installing strip-shaped abrasive loading components on a drum-type fixture, batch assembly and rotary electroplating of the rotary grinding heads were achieved, ensuring the uniformity of the electric field and abrasive field. By alternately setting the rotary grinding head and conductive tube on the conductive wire and using an elastic tube to fill the inner hole of the rotary grinding head, the electroplating solution was effectively prevented from entering the inner hole and causing it to become smaller. At the same time, the conductive tube and the end face of the rotary grinding head were in contact to conduct electricity, avoiding the problem of end face electroplating adhesion and abrasive shortage, optimizing the electric field distribution and improving the consistency of the abrasive layer's edge height.

[0011] Furthermore, the elastic tube and the conductive wire, as well as the elastic tube and the inner hole of the grinding head, are both interference-fitted. The interference fit ensures that the elastic tube fits tightly against the inner hole of the grinding head and the conductive wire during the electroplating process, completely preventing the electroplating solution from seeping into the inner hole, ensuring that the inner hole size remains unchanged before and after electroplating, improving the assembly accuracy of the grinding head, and also enabling the grinding head to be fixed by the interference fit.

[0012] Furthermore, the elastic tube is an elastic plastic tube; the conductive tube is a metal conductive tube, with an insulating and shielding adhesive layer on the outer wall of the metal conductive tube, and the inner hole in contact with the conductive wire for conduction. The elastic plastic tube has good elasticity and insulation; the insulating and shielding adhesive layer on the outer wall of the metal conductive tube effectively prevents the outer circumference of the conductive tube from being electroplated, avoids adhesion between the end face of the grinding head and the electroplated conductive tube, and ensures that the end face is intact and without missing pieces during removal.

[0013] Furthermore, the outer diameter of the insulating masking layer is greater than or equal to the distance from the farthest point of the grinding head end face to the axis of the inner hole. This dimensional design ensures that the insulating masking layer can completely cover the edge of the grinding head end face, thoroughly isolating the electroplating connection between adjacent grinding heads and further preventing end face adhesion.

[0014] Furthermore, the auxiliary cathode holder is equipped with a clamping nut for locking the end of the conductive wire. The clamping nut securely locks the conductive wire and allows for quick assembly and disassembly, improving the efficiency of batch assembly and the stability of the conductive wire tension. The roller-type fixture includes a central shaft, on which a roller is coaxially fixed. The auxiliary cathode holder is snap-fitted or bolted to the side wall of the roller. The structural design of the central shaft and roller facilitates rotational drive within the electroplating tank during the sandblasting process, while the snap-fit ​​or bolted connection ensures connection stability.

[0015] Furthermore, the central shaft is equipped with pulleys, gears, or sprockets. The arrangement of pulleys, gears, or sprockets facilitates transmission and cooperation with external drive mechanisms (such as belts or chains) in actual use, enabling smooth rotation and indexing control of the sand-applying device during the sand-applying process.

[0016] A process for electroplating a rotary grinding head, employing the precision medical rotary grinding head sanding device as described above, includes the following steps:

[0017] S1: Process several grinding heads to be sanded, and insert the inner hole of the grinding head into the elastic tube;

[0018] S2: The conductive tube and the grinding head are alternately placed on the conductive wire, and the two ends of the conductive wire are connected to the auxiliary cathode seat respectively. The auxiliary cathode seat is installed on the circumferential side wall of the roller jig to form a grinding head sanding device.

[0019] S3: Perform pre-plating treatment on the grinding head sanding device: completely remove the oxide scale on the surface of the grinding head or electroplat a dense nickel plating layer on the surface of the grinding head.

[0020] S4: A layer of base nickel is pre-plated with high current density. The grinding head sanding device is installed on the suspension sanding device. The sanding is carried out by the suspension indexing sanding process. The abrasive is suspended and dropped according to the rotation time and angle of the grinding head sanding device, so that the diamond abrasive is evenly solidified on the outer contour of the grinding head.

[0021] S5: After the electroplating sand is completed, the grinding wheel is transferred to the chemical nickel sand fixing tank for rotation and sand fixing.

[0022] Pretreatment ensures adhesion, high-current pre-plating of base nickel improves deposition efficiency, and suspension-based indexing and sand planting combined with rotary sand fixing ensures uniform distribution and firm bonding of diamond abrasive on the surface of the micro-grinding head, significantly improving the consistency of abrasive layer edge height and electroplating efficiency during mass production.

[0023] Furthermore, step S1 also includes pre-treating the conductive tube: electroplating, spraying, or wrapping an insulating masking layer on the outer circumference of the conductive tube. Insulating the outer circumference of the conductive tube prevents it from participating in the electroplating reaction at the source, avoiding defects such as end-face adhesion and missing sand.

[0024] Furthermore, the process includes step S6: removing the polishing head after sand fixation from the conductive wire, simultaneously removing the internal elastic tube, and inspecting the abrasive layer of the polishing head under a microscope. Removing the elastic tube restores the original inner hole size of the polishing head, and the microscopic inspection ensures the quality of the abrasive layer of the micro-polishing head, guaranteeing the reliability of the product.

[0025] The beneficial effects of this invention are:

[0026] This invention connects multiple rotary grinding heads in series and fixes them on a roller-type fixture using conductive wires, achieving multi-piece assembly and good conductivity. This enables mass production of electroplating, significantly improving production efficiency and reducing manufacturing costs. By filling the space between the inner hole of the rotary grinding head and the conductive wire with an elastic tube and using an interference fit, the path for the electroplating solution to enter the inner hole is completely blocked, ensuring that the inner hole size of the rotary grinding head remains unchanged before and after electroplating. This solves the problem of insufficient sealing of the inner hole in traditional processes, which leads to a smaller diameter, and guarantees the fitting accuracy between the rotary grinding head and the drive guide wire.

[0027] This invention employs an alternating arrangement of the grinding head and the conductive tube, with an insulating shielding layer on the outer wall of the metal conductive tube. This ensures that the conductive tube conducts electricity only through its inner hole, while the outer circumference remains insulated. This effectively prevents the grinding head end face from sticking to the conductive tube during electroplating, and avoids damage to the grinding head end face or loss of the abrasive layer during removal, significantly improving product yield.

[0028] This invention employs a roller-type fixture in conjunction with an auxiliary cathode seat to optimize the electric field distribution in high current density areas. By combining a suspension-based indexing sand-planting process and a chemical nickel rotary sand-fixing process, the abrasive is dropped evenly and at regular intervals according to the rotation time and angle, ensuring the uniformity of the abrasive layer height at the circumference of the micro-rotary burr head and improving the stability and safety of rotary burr treatment. Attached Figure Description

[0029] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the rotary grinding head structure of the present invention;

[0031] Figure 2 This is a schematic cross-sectional view of the mounting structure of the rotary grinding head of the present invention;

[0032] Figure 3 This is a schematic diagram of the sand-coating component structure of the present invention;

[0033] Figure 4This is a schematic diagram of the overall structure of the sand-applying device of the present invention;

[0034] In the diagram: 1: Conductive wire; 2: Grinding head; 3: Elastic tube; 4: Insulating shielding layer; 5: Conductive tube; 6: Auxiliary cathode seat; 7: Clamping nut; 8: Inner hole; 9: Central shaft; 10: Roller. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1

[0037] A sanding device for a precision medical rotary grinding head, such as Figure 1 , 2 As shown in Figure 3, the micro-abrasive head used for the rotary atherectomy of calcified vascular plaques is primarily used for batch electroplating and sanding. The sanding device includes a roller-type fixture, as specifically described in this embodiment. Figure 4 As shown, the roller fixture includes a central shaft 9, on which a roller 10 is coaxially fixed. Both ends of the central shaft 9 are equipped with pulleys, gears, or sprockets for connection to an external drive via a belt or chain, enabling rotational drive of the roller fixture. The circumferential sidewalls of the roller fixture are provided with several strip-shaped sand-applying components. The length direction of these components is parallel to the axis of the roller fixture, and they are evenly distributed on the roller sidewalls to achieve batch processing.

[0038] The sanding assembly includes a conductive wire 1, which can be made of stainless steel. A plurality of grinding heads 2 and conductive tubes 5 are alternately arranged on the conductive wire 1. The end faces of the grinding heads 2 and the conductive tubes 5 abut against each other. An elastic tube 3 fills the space between the inner hole 8 of the grinding head 2 and the conductive wire 1 to prevent electroplating material from entering the inner hole 8 of the grinding head 2. In this embodiment, the elastic tube 3 is a hollow elastic plastic tube. To ensure sealing and fixing, an interference fit is used between the elastic tube 3 and the conductive wire 1, and between the elastic tube 3 and the inner hole of the grinding head 2. The outer diameter of the conductive wire 1 is larger than the inner diameter of the elastic tube 3. When the grinding head 2 is inserted, the elastic tube 3 expands, thus tightly fitting the inner hole of the grinding head 2.

[0039] In addition, the conductive tube 5 is a metal conductive tube. To ensure conductivity and prevent electroplating on the outer circumference, an insulating masking layer 4 is provided on the outer wall of the metal conductive tube. This masking layer can be formed on the outside of the metal conductive tube by electroplating, spraying, or wrapping. The inner hole of the metal conductive tube is in contact with the conductive wire 1 and is conductive, while the end of the metal conductive tube is in contact with the end of the grinding head 2 and is conductive. In this embodiment, to prevent adhesion between the end face of the grinding head and the contact area of ​​the metal conductive tube when electroplated, the outer diameter of the insulating masking layer 4 is greater than or equal to the distance from the farthest point of the end face of the grinding head 2 to the axis of the inner hole, thereby ensuring complete isolation of adjacent grinding head end faces. Removal will not result in missing pieces or abrasive layer on the end face of the grinding head.

[0040] In a further specific embodiment, both ends of the conductive wire 1 are connected to the auxiliary cathode seat 6, and the auxiliary cathode seat 6 is detachably connected to the side wall of the roller-type fixture. The auxiliary cathode seat 6 can be connected to the side wall of the roller by conventional snap-fit ​​or bolts. In this embodiment, the auxiliary cathode seat 6 is connected to the side wall of the roller by bolts. In addition, the auxiliary cathode seat 6 is provided with a clamping nut 7 for locking the end of the conductive wire 1. In specific installation, one end of the conductive wire 1 is inserted into the small hole on the end face of the auxiliary cathode seat 6 and then the clamping nut 7 is used to press the conductive wire 1 and the auxiliary cathode seat 6 together, thereby connecting and tensioning the products.

[0041] Example 2

[0042] A process for electroplating a rotary grinding head, using the sanding device for a precision medical rotary grinding head described in Example 1, includes the following steps:

[0043] S1: Matrix Preparation and Pretreatment

[0044] Process several rotary grinding heads 2 to be sanded, and insert hollow elastic plastic tubes 3 into the inner holes of the rotary grinding heads 2. At the same time, pre-treat the conductive tube 5: electroplate, spray or wrap a layer of non-conductive masking glue 4 on the outer circle of the conductive tube 5 to make the outer circle of the conductive tube non-conductive.

[0045] S2: Electroplating Assembly

[0046] One end of the conductive wire 1 is threaded into the auxiliary cathode seat 6 and tightened by the clamping nut 7. The conductive tube 5, wrapped with non-conductive masking adhesive 4, and the grinding head 2, with an elastic plastic tube 3 passing through its inner hole, are alternately threaded onto the conductive wire 1 in sequence, cycling through them to the other end of the conductive wire. Finally, the tail of the conductive wire 1 is tightened to another auxiliary cathode seat 6 by the clamping nut 7, connecting the products into a string to form a strip-shaped sanding assembly. The sanding assemblies are then fixed sequentially to the circumferential sidewalls of a dedicated roller-type fixture via the auxiliary cathode seats 6 at both ends, allowing for batch assembly of the grinding heads to form a grinding head sanding device.

[0047] S3: Pretreatment before electroplating

[0048] Pre-plating treatment of the grinding head sanding device: Using existing mature pre-plating treatment technology, ensure that the oxide scale on the surface of the electroplating area of ​​the roller fixture is completely removed, and a dense nickel plating layer is chemically deposited to ensure the adhesion of the subsequent nickel plating layer.

[0049] S4: Electroplating with sand coating

[0050] Before electroplating and sand planting, a base nickel layer is pre-plated using a high current density. Then, the sand planting device on the rotary grinding head is installed in the suspension sand planting tank of a dedicated suspension sand planting equipment, and suspension-based indexing sand planting is performed. To increase the diamond concentration of the abrasive layer on the grinding wheel while avoiding insufficient abrasive, a suspension-based indexing sand planting process is used. The abrasive is suspended and dropped at timed intervals according to the rotation time and angle of the sand planting device on the rotary grinding head, so that the abrasive is evenly fixed on the outer contour of the rotary grinding head substrate.

[0051] S5: Electroplated Sanding

[0052] After electroplating and sand deposition are completed, the rotary grinding head is transferred to the electroless nickel plating tank for rotary sand deposition. The uniform deposition characteristics of electroless nickel plating ensure the uniformity of the abrasive layer's edge height around the circumference of the batch of rotary grinding heads.

[0053] S6: Disassembly and Inspection

[0054] After the abrasive has been fixed, the reaming head 2 is removed from the conductive wire 1, and the internal hollow elastic plastic tube 3 is removed to restore the original inner diameter of the reaming head. Finally, the reaming head 2 is inspected for abrasive layer using a 200X microscope to ensure that the cutting edge height and abrasive distribution meet medical-grade standards.

[0055] Example 3

[0056] Based on Example 2, taking the machining of a 304 stainless steel rotary grinding head with an outer diameter of 1.5mm, an inner hole of 0.78mm, and a length of 5mm as an example, 600# diamond micro powder is used as the abrasive. The specific steps are as follows:

[0057] S1: Matrix Preparation and Pretreatment

[0058] Several rotary grinding heads 2 are prepared for sanding. The rotary grinding heads can be made of stainless steel or copper; in this embodiment, stainless steel is used. The inner hole of the rotary grinding head 2 is inserted into a hollow elastic plastic tube 3. In this embodiment, the outer diameter of the elastic plastic tube 3 is 0.76 mm, the inner hole is 0.4 mm, and the length is 5 mm.

[0059] Meanwhile, the conductive tube 5 with an outer diameter of 0.8 mm, an inner hole of 0.49 mm, and a length of 4 mm is pretreated by electroplating, spraying, or wrapping a layer of non-conductive masking adhesive 4 with a thickness of 0.08 mm on the outer circle of the conductive tube 5, so that the outer circle of the conductive tube is non-conductive.

[0060] S2: Electroplating Assembly

[0061] One end of the conductive wire 1 is threaded into the auxiliary cathode seat 6 and tightened by the clamping nut 7. The rubber-coated conductive tube 5 and the rotary grinding head 2 with an elastic plastic tube 3 inserted through its inner hole are alternately threaded onto the conductive wire 1 in sequence, cycling through them to the other end of the conductive wire. Finally, the tail of the conductive wire 1 is tightened to another auxiliary cathode seat 6 by the clamping nut 7, connecting the products into a string. The string of rotary grinding heads is fixed onto a roller-type fixture via the auxiliary cathode seat 6, completing the batch assembly of the rotary grinding heads and forming the sanding device structure for the rotary grinding head.

[0062] S3: Pretreatment before electroplating

[0063] Pre-treatment of the grinding head sanding device for electroplating: The pre-treatment is carried out using mature stainless steel or copper substrate pre-treatment technology. In this embodiment, stainless steel pre-treatment technology is used to ensure that the oxide scale on the surface of the grinding head electroplating area is completely removed and a dense nickel plating layer is chemically deposited to ensure the adhesion of the subsequent nickel plating layer.

[0064] S4: Electroplating with sand coating

[0065] Before electroplating and sand application, a base nickel layer is pre-plated using a high current density. Then, the sand application device on the rotary grinding head is installed in a dedicated suspension sand application tank. In this embodiment, pulleys are provided at both ends of the central shaft of the roller, and two pulleys are suspended by a belt. The entire sand application device is placed into the tank for suspension and indexing sand application. To increase the diamond concentration of the abrasive layer on the grinding wheel while avoiding insufficient sand, a suspension indexing sand application process is adopted. The abrasive is suspended and dropped at timed intervals according to the rotation time and angle of the sand application device on the rotary grinding head, so that the 600# diamond micro powder abrasive is evenly solidified on the outer contour of the rotary grinding head.

[0066] In this embodiment, when the sand feeding device is installed on the suspended sand planting equipment, the upper end of the belt is connected to the pulleys arranged coaxially. The pulleys on the upper part are all mounted on the crossbar. The crossbar is rotatably mounted on the suspended sand planting equipment. The suspended sand planting equipment is equipped with a drive motor. The crossbar is equipped with gears, and the gears mesh with the gears at the drive shaft of the drive motor. Thus, when sand is fed, the drive motor can drive the crossbar to rotate, thereby driving the drum of the sand feeding device to rotate, realizing the timed suspended sand dropping operation.

[0067] S5: Electroplated Sanding

[0068] After the electroplating and sanding are completed, the rotary grinding head is transferred to the electroless nickel plating tank for rotary sanding and forming an abrasive layer on the surface of the rotary grinding head. Through the uniform deposition characteristics of electroless nickel plating, the uniformity of the edge height of the circumferential abrasive layer of the batch rotary grinding heads is ensured.

[0069] S6: Disassembly and Inspection

[0070] After the abrasive has been fixed, the reaming head 2 is removed from the conductive wire 1, and the hollow elastic plastic tube 3 inside is also removed to restore the original inner diameter of the reaming head. Finally, the reaming head 2 is inspected for abrasive layer using a 200X microscope to ensure that the cutting edge height and abrasive distribution meet medical-grade standards.

[0071] Through the above embodiments, the present invention effectively solves the technical problems of poor sealing of the inner hole of the electroplated rotary burr head in precision medical applications, resulting in a smaller inner hole diameter, end face adhesion and missing sand, and poor consistency of the edge height of the batch electroplated abrasive layer, thus achieving high-quality and high-efficiency mass production. In this embodiment, through high current density zone assisted cathode absorption, indexed suspension sand planting, and chemical plating rotary sand fixing processes, the edge height of the abrasive layer is well consistent, resulting in even better consistency of the edge height of the batch electroplated abrasive layer; the inner hole of the rotary burr head adopts a hollow elastic plastic tube with interference fit, and the inner hole size does not change before and after electroplating; the end faces of adjacent rotary burr heads are connected by a rubber-coated stainless steel conductive tube to prevent the end face of the rotary burr head from sticking to the conductive tube during electroplating, which would cause defects on the end face of the rotary burr head during removal, thus improving the electroplating accuracy.

[0072] Example 4

[0073] Based on Example 3, when sanding the eccentric rotary grinding head, after step S2, "the rubber-coated conductive tube 5 and the rotary grinding head 2 with the elastic plastic tube 3 inside the inner hole are alternately threaded onto the conductive wire 1 in sequence, and then circulated to the other end of the conductive wire," the following steps are also included: adjusting the orientation of the eccentric protrusion of the rotary grinding head so that the eccentric protrusion of all eccentric rotary grinding heads faces the same direction, and ensuring that when the auxiliary cathode seats 6 at both ends of the conductive wire are subsequently fixed to the circumferential side wall of the special roller-type fixture, the eccentric protrusion of the eccentric rotary grinding head is located on the side away from the side wall of the roller-type fixture. Then, the tail of the conductive wire 1 is pressed against another auxiliary cathode seat 6 by the clamping nut 7.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sanding device for a precision medical rotary burr head, characterized in that: The jig includes a roller-type fixture, wherein the circumferential sidewall of the roller-type fixture is provided with a plurality of strip-shaped sanding components, the length direction of the sanding components being parallel to the axis of the roller-type fixture; The sand-grinding assembly includes a conductive wire (1), on which a plurality of grinding heads (2) and conductive tubes (5) are alternately arranged in sequence. The end faces of the grinding heads (2) and the conductive tubes (5) abut against each other. An elastic tube (3) is filled between the inner hole (8) of the grinding head (2) and the conductive wire (1). The two ends of the conductive wire (1) are respectively connected to the auxiliary cathode seat (6), and are detachably connected to the roller fixture through the auxiliary cathode seat (6).

2. The sanding device for a precision medical rotary burr head according to claim 1, characterized in that: The elastic tube (3) and the conductive wire (1) are both interference-fitted, as are the elastic tube (3) and the inner hole (8) of the grinding head (2).

3. The sanding device for a precision medical rotary burr head according to claim 2, characterized in that: The elastic tube (3) is an elastic plastic tube; the conductive tube (5) is a metal conductive tube, and the outer wall of the metal conductive tube is provided with an insulating shielding adhesive layer (4), and the inner hole is in contact with the conductive wire (1) for conduction.

4. The sanding device for a precision medical rotary burr head according to claim 3, characterized in that: The outer diameter of the insulating shielding adhesive layer (4) is greater than or equal to the distance from the farthest point on the end face of the grinding head (2) to the axis of the inner hole.

5. The abrasive device for a precision medical rotary burr head according to any one of claims 1 to 4, characterized in that: The auxiliary cathode holder (6) is provided with a clamping nut (7) for locking the end of the conductive wire (1).

6. The sanding device for a precision medical rotary burr head according to claim 5, characterized in that: The roller fixture includes a central shaft (9), on which a roller (10) is coaxially fixed. The auxiliary cathode seat (6) is snapped or bolted to the side wall of the roller (10).

7. The sanding device for a precision medical rotary burr head according to claim 6, characterized in that: The central shaft (9) is provided with a pulley, gear or sprocket.

8. A process for electroplating a rotary grinding head, comprising using a sanding device for a precision medical rotary grinding head as described in any one of claims 1 to 7, characterized in that... Includes the following steps: S1: Process several grinding heads (2) to be sanded, and insert the inner hole of the grinding head (2) into the elastic tube (3). S2: The conductive tube (5) and the grinding head (2) are alternately placed on the conductive wire (1), and the two ends of the conductive wire (1) are connected to the auxiliary cathode seat (6) respectively. The auxiliary cathode seat (6) is installed on the circumferential side wall of the roller jig to form a grinding head sanding device. S3: Perform pre-plating treatment on the grinding head sanding device: completely remove the oxide scale on the surface of the grinding head (2) or deposit a dense nickel plating layer on the surface of the grinding head (2). S4: A layer of base nickel is pre-plated with high current density. The grinding head sanding device is installed on the suspension sanding device. The sanding is carried out by the suspension indexing sanding process. The abrasive is suspended and dropped according to the rotation time and angle of the grinding head sanding device, so that the diamond abrasive is evenly solidified on the outer contour of the grinding head. S5: After the electroplating sand is completed, the grinding wheel is transferred to the chemical nickel sand fixing tank for rotation and sand fixing.

9. The electroplating process for preparing a rotary grinding head according to claim 8, characterized in that: Step S1 also includes pretreatment of the conductive tube (5): electroplating, spraying or wrapping an insulating masking layer (4) on the outer circle of the conductive tube (5).

10. The electroplating process for preparing a rotary grinding head according to claim 9, characterized in that: It also includes step S6: removing the polishing head (2) after sand fixation from the conductive wire (1), removing the internal elastic tube (3) at the same time, and inspecting the abrasive layer of the polishing head (2) under a microscope.

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