Magnetic force polishing device and magnetic force polishing method for titanium alloy implant

Abstract

The application relates to a magnetic force grinding device and a magnetic force grinding and polishing method for a titanium alloy implant, and belongs to the technical field of grinding and polishing. The device comprises a grinding bin and a bin cover, is arranged above a main machine base, is internally provided with grinding medium, is internally provided with an elastic support seat on the inner wall of the bottom end of the grinding bin, is screw-connected to the inner wall of the upper end of the grinding bin, is provided with an intermittent exhaust valve on the bin cover, senses the gas pressure in the grinding bin, intermittently releases pressure, forms movable air pressure, is provided with a dripping clamp cylinder in the middle of the bin cover, is vertically arranged on the bin cover, is coaxial with the elastic support seat, is internally provided with an oxidation assisting liquid, is provided with a liquid leakage opening at the lower end of the dripping clamp cylinder, is provided with an elastic movable part at the liquid leakage opening, and the oxidation assisting liquid is added by dripping intermittently to form a soft oxidation layer on the surface of the titanium alloy. The soft oxidation layer is removed by cooperating with a magnetic needle driven by a magnet array, and the grinding efficiency and surface smoothness are improved.

Description

Technical Field

[0001] This application relates to the field of grinding and polishing technology, and in particular to a magnetic grinding device and magnetic grinding and polishing method for titanium alloy implants. Background Technology

[0002] Titanium alloy implants are widely used in the field of oral medicine. Their surface roughness directly affects the bone integration efficiency and initial stability. Magnetic abrasion, as a flexible precision machining method, is often used for surface finishing of complex threaded structures of implants.

[0003] Existing technologies involve a method and apparatus for electrochemical magnetic polishing finishing of alloy tubes. The apparatus includes a magnetic polishing system, an electrochemical reaction system, and an ultrasonic vibration system. Permanent magnets and V-shaped auxiliary magnets are respectively installed on the outer and inner sides of the alloy tube workpiece, with magnetic abrasive particles placed between the V-shaped auxiliary magnets and the alloy tube workpiece. An electrolytic cell is sequentially connected to a peristaltic pump and a copper rod electrode, which is connected to a carbon brush located on the outer side of the alloy tube workpiece via a DC power supply. An ultrasonic generator is sequentially connected to a transducer, an amplitude transformer, a flexible collet, and a connecting rod via a slip ring, with the connecting rod connected to the V-shaped auxiliary magnet. The alloy tube workpiece is mounted on a three-jaw chuck of a horizontal lathe. The magnetic polishing system, electrochemical reaction system, and ultrasonic vibration system are all mounted on the horizontal lathe's slide box via a worktable. This composite process of electrochemical machining and axial ultrasonic vibration-assisted magnetic polishing achieves finishing of cemented carbide tubes, improving processing efficiency and surface quality.

[0004] The aforementioned and existing magnetic polishing devices, even with the addition of an oxidizing agent for softening and polishing, suffer from several drawbacks. Adding the oxidizing agent all at once can cause excessively vigorous reactions in the initial stage, generating a large number of bubbles that hinder polishing. Constant-rate dripping introduces a complex electronic control system, which cannot be adjusted according to the reaction rate, i.e., the polishing effect. Furthermore, for implants with complex spiral surfaces, unidirectional stirring can cause the magnetic needles to clump together, thus affecting the polishing accuracy of the complex spiral surfaces. Summary of the Invention

[0005] This application provides a magnetic grinding device and a magnetic grinding and polishing method for titanium alloy implants, which can solve the problems that, for implants with complex spiral surfaces, a single-direction stirring method can cause magnetic needles to clump together, and when adding an oxidation-aiding liquid for polishing, it is difficult to take into account both air bubble obstruction and complex electrical control.

[0006] The technical solution of this application is as follows: A magnetic grinding device for titanium alloy implants includes a main base, inside which a drive disk and a drive motor are provided. The drive disk includes a rotating disk and a magnet array, the magnet array being disposed on the rotating disk. The drive shaft of the drive motor is coaxially connected and fixed to the rotating disk. The magnet array is configured to generate a rotatable magnetic field above it. The device also includes: A grinding chamber is disposed above the base of the main unit. The grinding chamber contains grinding media, and an elastic support seat is provided on the inner wall at the bottom end of the grinding chamber. A chamber cover, threadedly connected to the inner wall of the upper end of the grinding chamber, is equipped with an intermittent vent valve. This valve senses the gas pressure inside the grinding chamber and intermittently releases pressure to create a dynamic pressure. A drip clamping cylinder is fitted in the middle of the chamber cover, extending vertically through the cover and coaxial with the elastic support. The lower end of the drip clamping cylinder engages with the elastic support to clamp the titanium alloy implant. An oxidation-aiding solution is provided inside the drip clamping cylinder, which is applied to the surface of the titanium alloy implant and generates gas. A leakage opening is located at the lower end of the drip clamping cylinder, with an elastic movable element at the opening. When the gas pressure inside the grinding chamber decreases, the elastic support returns to its original position, driving the clamped titanium alloy implant upwards and lifting the elastic movable element to open the leakage opening and release the oxidation-aiding solution; or When the air pressure inside the grinding chamber increases, the titanium alloy implant is pressed downward, causing the elastic movable part to reset and seal the leakage opening.

[0007] By adopting the above scheme, the soft oxide layer generated on the surface of titanium alloy by the auxiliary oxidation liquid is removed by magnetic needles driven by a magnet array. Compared with simple physical grinding, the grinding efficiency and surface finish are improved. At the same time, the gas generated by the oxidation reaction is used as a power source. When the reaction in the grinding chamber is intense and the air pressure rises, the intermittent exhaust valve is activated and pulsed air pressure oscillation is generated. The elastic support seat captures the air pressure oscillation and converts it into mechanical vibration, which in turn drives the elastic moving parts in the drip clamping cylinder to release new auxiliary oxidation liquid. This realizes the automatic intermittent replenishment of auxiliary oxidation liquid. The concentration of oxidation liquid can be kept constant without a complicated electronic control system. At the same time, the pulsed air pressure fluctuation can also assist in chip removal and prevent grinding dead corners.

[0008] In one embodiment of this application, the drip clamping cylinder has a filling cavity inside, the oxidizing liquid is disposed inside the filling cavity, and a limiting cavity is formed below the filling cavity inside the drip clamping cylinder. The upper end of the filling cavity is connected to the limiting cavity, and the lower end has a leakage opening. An elastic movable member is provided inside the limiting cavity, and the elastic movable member moves up and down inside the limiting cavity to control the opening and closing of the leakage opening.

[0009] By adopting the above scheme, the filling cavity and the limiting cavity are interconnected, ensuring that the liquid always fills the limiting cavity under the action of gravity. The elastic moving part seals the leakage opening with its own weight and elastic force in the non-vibration state, preventing the liquid from flowing out and being wasted. At the same time, when the elastic support seat vibrates, the passage can be opened intermittently by inertial displacement, thereby realizing the on-demand titration of the oxidizing agent, ensuring the formation of a soft oxide film, which is easy to grind and polish.

[0010] In one embodiment of this application, the drip clamping cylinder is provided with a plurality of arc-shaped guide grooves spaced apart circumferentially on the inner wall of the limiting cavity.

[0011] By adopting the above scheme, when the elastic moving part moves up and down in the limiting cavity to open the valve, the arc-shaped guide groove provides a smooth lateral fluid channel around the ball, which avoids the ball from being stuck in the closed position due to liquid adsorption force or vacuum effect, and at the same time can help the oxidizing liquid to flow out quickly from the inside of the limiting cavity.

[0012] In one embodiment of this application, the elastic movable element includes: A ball bearing, wherein the ball bearing is disposed inside the limiting cavity; The elastic element is provided in multiple ways. One end of each elastic element is fixedly connected to the inner wall of the limiting cavity, and the other end is connected and fixed to the ball. The diameter of the ball is larger than the diameter of the leakage opening.

[0013] By adopting the above scheme, the spherical structure of the ball can automatically center and match the leakage opening, thereby ensuring that the ball can provide a good static seal for the limiting cavity. When the intermittent exhaust valve generates fluctuating air pressure, causing the device to vibrate slightly, the ball lags behind the cavity movement due to inertia, thereby quickly compressing the elastic element and opening the flow channel, so that the device can convert the pneumatic signal into a mechanical switch action.

[0014] In one embodiment of this application, the intermittent exhaust valve includes: A valve body is vertically mounted on the compartment cover, and a flow passage is provided inside the valve body; An elastic diaphragm is embedded in the inner wall of the flow channel. The elastic diaphragm has an arched surface and a cross-shaped slit at the arched surface.

[0015] By adopting the above scheme, the arched surface structure of the elastic diaphragm can ensure that the elastic diaphragm can store a certain amount of energy. This allows the elastic diaphragm to flip and burst open the cross gap and release air only when the air pressure inside the chamber reaches a specific threshold. This enables the elastic diaphragm to open and close quickly, thereby driving the elastic support seat to vibrate up and down slightly. It can also disturb the grinding medium at the microscopic level, preventing the magnetic needle from clumping at the root of the implant thread, and further ensuring the grinding effect of the magnetic needle.

[0016] In one embodiment of this application, the elastic support includes: The fixing base has a placement cavity inside; A sliding seat, one end of which extends into the placement cavity and slides in a sealed manner with the fixed seat; An elastic airbag is provided between the fixed seat and the sliding seat. The elastic airbag is located inside the placement cavity and is filled with inert gas.

[0017] By adopting the above technical solution, and by setting an elastic airbag filled with inert gas, it can not only support the weight of the drip clamping cylinder, but also drive the sliding seat to vibrate up and down under the air pressure fluctuations in the grinding chamber, so as to drive the vertical reciprocating motion of the drip clamping cylinder.

[0018] In one embodiment of this application, the inner wall of the valve body is provided with an intake section, a throat section and a diffuser section in sequence along the intake direction, and the intake section, throat section and diffuser section are interconnected to form the flow passage; The inner wall of the air intake section is provided with a spiral flow guide groove.

[0019] By adopting the above scheme, the Venturi flow channel formed by the intake section, throat section and diffuser section generates local negative pressure when the airflow passes through the throat. This negative pressure assists the elastic diaphragm to overcome inertia at the end of exhaust and quickly reset and close, eliminating the valve hysteresis and increasing the vibration frequency. At the same time, the spiral guide groove can guide the airflow to form a vortex. The rotating airflow can not only vertically impact the center of the diaphragm to prevent uneven force on the diaphragm, but also use centrifugal force to continuously blow the inner wall of the valve body, preventing the small particles or crystals generated by grinding from clogging the precision air passage, thus realizing the self-cleaning of the valve body.

[0020] The second objective of this application is to provide a magnetic grinding and polishing method for titanium alloy implants.

[0021] The technical solution is as follows: A magnetic grinding and polishing method for titanium alloy implants, used to grind titanium alloy implant workpieces using a magnetic grinding device, including the following steps: S1. The titanium alloy dental implant workpiece is ultrasonically cleaned in acetone, anhydrous ethanol and deionized water in sequence, and then dried. S2. Add stainless steel magnetic needles, grinding fluid and distilled water to the grinding chamber and mix them to form the grinding medium; S3. Fix the dried dental implant workpiece inside the grinding chamber and ensure that the grinding media immerses the dental implant. S4. Control the drive disk to rotate periodically and intermittently add oxidation aid to drive the grinding media to grind and polish the dental implant workpiece. S5. Rinse the polished dental implant workpiece sequentially with deionized water and anhydrous ethanol to obtain the finished titanium alloy implant.

[0022] By adopting the above scheme, and utilizing the periodic reciprocating magnetic field in step S4, the magnetic needle can cut into the complex thread structure of the implant from different angles, eliminating the grinding dead angle caused by grinding in one direction. In addition, by intermittently adding an oxidation-aiding solution, an oxide layer can be generated on the surface of the dental implant workpiece, which is then ground away by the magnetic needle. This avoids both excessive corrosion of the substrate caused by excessive oxidant and reduced grinding efficiency caused by an excessively thick oxide layer, ultimately obtaining a uniform, high-gloss biocompatible surface.

[0023] In one embodiment of this application, the volume ratio of the grinding fluid to distilled water is 1:30 to 1:80, and the diameter of the stainless steel magnetic needle is 0.2 to 1.5 mm, and the length is 3 to 8 mm.

[0024] By adopting the above scheme, a liquid-to-solid ratio of 1:30 to 1:80 ensures that the magnetic needles have good dispersibility in the fluid, preventing them from agglomerating. At the same time, the stainless steel magnetic needles with a diameter of 0.2 to 1.5 mm can penetrate deep into the tiny thread roots and neck structure of the titanium alloy implant for effective grinding. Combined with a length of 3 to 8 mm, the magnetic needles have sufficient flexibility and magnetic torque under the action of the magnetic field, enabling conformal polishing of complex curved surfaces on the workpiece.

[0025] In one embodiment of this application, the polishing fluid comprises an oxidation-resistant chelating agent, a surfactant, and a lubricant.

[0026] By adopting the above scheme, the oxidation-resistant chelating agent can complex the metal ions ground down, preventing them from being deposited back and contaminating the workpiece surface. The surfactant reduces the surface tension of the liquid, allowing the grinding fluid to quickly wet the microporous structure of the implant. The lubricant reduces the non-cutting frictional heat between the magnetic needle and the workpiece, preventing local overheating and discoloration of the workpiece and ensuring the consistency of processing quality. In addition, during the actual grinding process, the oxygen microbubbles generated by the reaction of the oxidizing liquid combine with the surfactant to easily form a foam layer on the upper part of the grinding chamber. When the exhaust valve is opened, the pressure inside the chamber drops sharply, and the foam bubbles expand and burst instantly. At the same time, the reciprocating vibration of the drip clamping cylinder in the vertical direction can also generate continuous mechanical impact and shearing action on the foam on the liquid surface. The combination of the two allows the device to perform fully automatic foam control even if bubbles appear without the need for an external power source. This ensures the grinding effect of the device while improving the grinding effect and efficiency by producing an oxide film and uniformly grinding and polishing.

[0027] In summary, this application includes at least one of the following beneficial technical effects: using the waste gas generated by the reaction of the auxiliary oxidation liquid as a feedback signal and power source, the continuous air pressure in the grinding chamber is converted into fluctuating air pressure through an intermittent exhaust valve. This fluctuating air pressure can be captured by the elastic support seat and converted into mechanical vibration, thereby driving the elastic moving parts in the drip clamping cylinder to replenish the liquid by inertial motion, thus ensuring the dynamic constant concentration of the auxiliary oxidation liquid in the grinding chamber without the need for an external electrical control system.

[0028] By setting a spiral guide groove on the inner wall of the valve body to guide the exhaust gas to form a high-speed swirling flow, the centrifugal force is used to continuously sweep the inner wall of the flow channel to prevent the grinding media from crystallizing and clogging. At the same time, in combination with the Venturi flow channel composed of the air inlet section, throat section and diffuser section and the arched surface design of the elastic diaphragm, the hysteresis of valve action is eliminated by utilizing the fluid negative pressure and the diaphragm energy storage jump characteristics. This results in the formation of high-frequency fluctuating air pressure inside the device, which in turn effectively drives the entire elastic support to vibrate.

[0029] By utilizing the interaction between the ball bearings and the elastic element, the device can sense the vertical movement of the workpiece. The up-and-down vibration of the device is converted into the switching action of the oxidizing liquid. Combined with the lateral bypass provided by the arc-shaped guide groove, the fluid damping and vacuum adsorption effects during the movement of the ball bearings are eliminated, ensuring the sensitivity of the ball bearing movement. This allows the oxidizing liquid to drip intermittently and sensitively and stably. Attached Figure Description

[0030] Figure 1 This is a perspective view of a magnetic abrasion device for a titanium alloy implant provided in the embodiments of this application; Figure 2 This is a front sectional view of the grinding chamber of a magnetic grinding device for a titanium alloy implant provided in the embodiments of this application; Figure 3 This is a front sectional view of a magnetic abrasion device for a titanium alloy implant, provided in an embodiment of this application, during the sealing of its drip clamp. Figure 4This is a front sectional view of a magnetic abrasion device for a titanium alloy implant, provided in an embodiment of this application, during the dripping of the drip clamping cylinder. Figure 5 This is a front sectional view of an elastic support base for a magnetic abrasion device for a titanium alloy implant provided in the embodiments of this application; Figure 6 This is a front sectional view of an intermittent exhaust valve of a magnetic abrasion device for a titanium alloy implant provided in an embodiment of this application; Figure 7 This is a three-dimensional view of the elastic diaphragm of a magnetic abrasion device for a titanium alloy implant provided in the embodiments of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Main unit base; 11. Drive disk; 12. Drive motor; 2. Grinding chamber; 21. Grinding medium; 22. Elastic support seat; 221. Fixed seat; 2211. Placement cavity; 222. Sliding seat; 223. Elastic airbag; 3. Chamber cover; 31. Intermittent exhaust valve; 311. Valve body; 3111. Air inlet section; 3112. Throat section; 3113. Diffusion section; 312. Flow channel; 313. Elastic diaphragm; 3131. Arched surface; 3132. Cross slit; 314. Flow guide groove; 32. Drip clamping cylinder; 321. Oxidation aid liquid; 322. Elastic moving part; 3221. Ball bearing; 3222. Elastic part; 323. Leakage opening; 324. Filling cavity; 325. Limiting cavity; 326. Arc-shaped flow guide groove; 4. Titanium alloy implant. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-7 This application provides a more detailed description of the magnetic abrasion device and magnetic abrasion polishing method for a titanium alloy implant.

[0033] For examples, please refer to Figure 1 and Figure 2This application provides a magnetic grinding device for titanium alloy implants, comprising: a grinding chamber 2 and a chamber cover 3, disposed above a main unit base 1. The grinding chamber 2 contains a grinding medium 21, and an elastic support seat 22 is provided on the inner wall of the bottom end of the grinding chamber 2, threadedly connected to the inner wall of the upper end of the grinding chamber 2. The chamber cover 3 is provided with an intermittent exhaust valve 31, which senses the gas pressure inside the grinding chamber 2 and intermittently releases pressure to form a dynamic gas pressure. A drip clamping cylinder 32 is assembled in the middle of the chamber cover 3, which is vertically inserted through the chamber cover 3 and coaxial with the elastic support seat 22. The lower end of the drip clamping cylinder 32 cooperates with the elastic support seat 22 to clamp the titanium alloy implant 4. The drip clamping cylinder 32 contains an oxidation aid liquid 321. 321 is configured as the surface of the titanium alloy implant 4 and generates gas. The lower end of the drip clamping cylinder 32 is provided with a liquid leakage opening 323, and an elastic movable element 322 is provided at the liquid leakage opening 323. When the gas pressure inside the grinding chamber 2 decreases, the elastic support seat 22 resets and springs upward, driving the clamped titanium alloy implant to move upward and lift the elastic movable element 322 to open the liquid leakage opening 323 and release the auxiliary oxidation liquid 321. Alternatively, when the gas pressure inside the grinding chamber 2 increases, the titanium alloy implant 4 is pressed downward, causing the elastic movable element 322 to reset and seal the liquid leakage opening 323. The soft oxide layer generated on the titanium alloy surface by intermittent dripping of auxiliary oxidation liquid 321 is removed by magnetic needles driven by a magnet array. Compared with simple physical grinding, the grinding efficiency and surface smoothness are improved.

[0034] In this embodiment, the oxidizing agent 321 can be a hydrogen peroxide solution with a mass fraction of 15% to 20%, wherein a hydrogen peroxide solution with a mass fraction of 20% is preferred, so that the device can maintain a constant consumption of oxidant in the grinding slurry and generate sufficient mechanical vibration energy to eliminate foam on the liquid surface. Depending on the initial roughness of the titanium alloy workpiece, the mass fraction of hydrogen peroxide in the oxidizing solution 321 can be selected between 10% and 30%. The system also includes a main unit base 1, which contains a drive disk 11 (not shown) and a drive motor 12 (not shown). The drive disk 11 includes a rotating disk (not shown) and a magnet array (not shown). The magnet array is mounted on the rotating disk. The drive shaft of the drive motor 12 is coaxially connected and fixed to the rotating disk. The magnet array is configured to generate a rotatable magnetic field above it. The assembly and connection methods between the drive disk 11 and the drive motor 12, as well as between the rotating disk and the magnet array, are conventional settings that can be made by those skilled in the art using existing barrel-type magnetic grinders as an example, and will not be described in detail here.

[0035] For workpieces with thick oxide scale, a high-concentration solution of 25% to 30% can be used to enhance the impact force of the magnetic needle by generating a strong air pressure pulse. For workpieces in the fine polishing stage, a low concentration solution of 10% to 15% can also be used to obtain a finer surface quality and reduce gas generation disturbance.

[0036] Please see Figure 3 and Figure 4 The drip clamping cylinder 32 has a filling cavity 324 inside, and the oxidizing agent 321 is placed inside the filling cavity 324. The drip clamping cylinder 32 has a limiting cavity 325 below the filling cavity 324. The upper end of the filling cavity 324 is connected to the limiting cavity 325, and the lower end has a leakage opening 323. The limiting cavity 325 has an elastic movable member 322 inside, which moves up and down inside the limiting cavity 325 to control the opening and closing of the leakage opening 323. By setting the limiting cavity 325 and the leakage opening 323, and using the elastic movable member 322, the quick opening and closing of the oxidizing agent 321 is realized.

[0037] Please see Figure 3 and Figure 4 The drip clamping cylinder 32 has multiple arc-shaped guide grooves 326 spaced circumferentially on the inner wall of the limiting cavity 325. By setting the arc-shaped guide grooves 326, the device provides a smooth lateral fluid channel around the ball 3221, which helps the oxidizing liquid 321 to flow out quickly from the inside of the limiting cavity 325.

[0038] Please see Figure 3 and Figure 4 The elastic movable element 322 includes a ball 3221 and an elastic element 3222. The ball 3221 is disposed inside the limiting cavity 325. Multiple elastic elements 3222 are disposed. One end of each elastic element 3222 is fixedly connected to the inner wall of the limiting cavity 325, and the other end is connected and fixed to the ball 3221. The diameter of the ball 3221 is larger than the diameter of the leakage opening 323. When the intermittent exhaust valve 31 generates fluctuating air pressure, causing the device to vibrate slightly, the ball 3221 can lag behind the cavity movement due to inertia, thereby converting the pneumatic signal into a mechanical switch action.

[0039] Please see Figure 5The elastic support base 22 includes a fixed base 221, a sliding base 222, and an elastic airbag 223. The fixed base 221 has a placement cavity 2211 inside. One end of the sliding base 222 extends into the placement cavity 2211 and slides and seals with the fixed base 221. An elastic airbag 223 is provided between the fixed base 221 and the sliding base 222. The elastic airbag 223 is located inside the placement cavity 2211 and is filled with inert gas. By providing an elastic airbag 223 filled with inert gas, it can both support the weight of the drip clamping cylinder 32 and sense the air pressure fluctuations in the grinding chamber 2, thereby converting the air pressure fluctuations into the vertical reciprocating motion of the drip clamping cylinder 32.

[0040] In this embodiment, the inert gas can be nitrogen.

[0041] Please see Figure 6 and Figure 7 The intermittent exhaust valve 31 includes a valve body 311 and an elastic diaphragm 313. The valve body 311 is vertically mounted on the chamber cover 3. The valve body 311 has a flow channel 312 inside. The elastic diaphragm 313 is embedded in the inner wall of the flow channel 312. The elastic diaphragm 313 has an arched surface 3131. The elastic diaphragm 313 has a cross-shaped slit 3132 at the arched surface 3131. By setting the elastic diaphragm 313 with the arched surface 3131, the elastic diaphragm 313 will only flip and burst open the cross-shaped slit 3132 and exhaust air when the air pressure inside the chamber reaches a specific threshold. This allows the elastic diaphragm 313 to open and close quickly.

[0042] In this embodiment, the elastic diaphragm 313 can be a sheet-like component made of silicone.

[0043] Please see Figure 6 The valve body 311 has an intake section 3111, a throat section 3112, and a diffuser section 3113 arranged sequentially along the intake direction. The intake section 3111, throat section 3112, and diffuser section 3113 are interconnected to form a flow passage 312. The inner wall of the intake section 3111 is provided with a spiral guide groove 314. The Venturi flow channel formed by the intake section 3111, throat section 3112, and diffuser section 3113 generates a local negative pressure when the airflow passes through the throat. This negative pressure assists the elastic diaphragm 313 in overcoming inertia and quickly resetting and closing at the end of the exhaust, thereby increasing the vibration frequency.

[0044] The second objective of this application is to provide a magnetic grinding and polishing method for titanium alloy implants.

[0045] The technical solution is as follows: A magnetic grinding and polishing method for titanium alloy implants, used to grind titanium alloy implant 4 workpieces using a magnetic grinding device, including the following steps: S1. The titanium alloy dental implant workpiece is ultrasonically cleaned in acetone, anhydrous ethanol and deionized water in sequence, and then dried. S2. Add stainless steel magnetic needles, grinding fluid and distilled water to the grinding chamber 2 and mix them to form grinding media 21; S3. Fix the dried dental implant workpiece inside the grinding chamber 2, and immerse the dental implant in the grinding media 21; S4. Control the drive disk 11 to rotate periodically and intermittently add oxidation aid to drive the grinding media 21 to grind and polish the dental implant workpiece. S5. Rinse the polished dental implant workpiece sequentially with deionized water and anhydrous ethanol to obtain the finished titanium alloy implant 4. In this embodiment, by intermittently adding an oxidation-aiding solution, an oxide layer is formed on the surface of the dental implant workpiece, which is then removed by grinding with a magnetic needle, thereby making the workpiece finer during grinding and polishing.

[0046] The volume ratio of grinding fluid to distilled water is 1:30 to 1:80, and the diameter of the stainless steel magnetic needle is 0.2 to 1.5 mm, and the length is 3 to 8 mm.

[0047] In this embodiment, the volume ratio of grinding fluid to distilled water is preferably 1:50; The diameter of the stainless steel magnetic needle is preferably 0.8 mm; the length of the stainless steel magnetic needle is preferably 5 mm.

[0048] The grinding fluid contains oxidation-resistant chelating agents, surfactants, and lubricants.

[0049] In this embodiment, the grinding slurry is a concentrated solution, and the mass percentage of each component is as follows: Oxidation-resistant chelating agent: 15%–20% disodium ethylenediaminetetraacetate; Surfactant: 5%–10% sodium dodecyl sulfate; Lubricant: 25%–35% polyethylene glycol; The remainder is deionized water.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A magnetic grinding device for titanium alloy implants, comprising a main base (1), wherein the main base (1) is provided with a drive disk (11) and a drive motor (12) inside, the drive disk (11) comprising a rotating disk and a magnet array, the magnet array being disposed on the rotating disk, the drive shaft of the drive motor (12) being coaxially connected and fixed to the rotating disk, the magnet array being configured to generate a rotatable magnetic field above it, characterized in that, Also includes: A grinding chamber (2) is located above the base (1) of the main unit. The grinding chamber (2) contains a grinding medium (21), and an elastic support seat (22) is provided on the inner wall of the bottom end of the grinding chamber (2). The chamber cover (3) is threaded onto the inner wall of the upper end of the grinding chamber (2). The chamber cover (3) is equipped with an intermittent exhaust valve (31). The intermittent exhaust valve (31) senses the gas pressure inside the grinding chamber (2) and intermittently releases pressure to form a dynamic air pressure. A drip clamping cylinder (32) is installed in the middle of the chamber cover (3). The drip clamping cylinder (32) is vertically inserted into the chamber cover (3) and coaxial with the elastic support base (22). The lower end of the drip clamping cylinder (32) cooperates with the elastic support base (22) to clamp the titanium alloy implant. The drip clamping cylinder (32) contains an oxidation-aiding liquid (321), which is applied to the surface of the titanium alloy implant and generates gas. The drip clamping cylinder (32) has a leakage opening (323) at its lower end, and an elastic movable element (322) is provided at the leakage opening (323). When the gas pressure inside the grinding chamber (2) decreases, the elastic support (22) resets and springs back, driving the clamped titanium alloy implant to move upward and lift the elastic movable element (322) to open the leakage opening (323) and release the oxidation-aiding liquid (321); or When the gas pressure inside the grinding chamber (2) increases, the titanium alloy implant is pressed downward, causing the elastic movable part (322) to reset and seal the leakage opening (323).

2. The magnetic grinding device for a titanium alloy implant according to claim 1, characterized in that: The drip clamping cylinder (32) has a filling cavity (324) inside, and the oxidizing liquid (321) is disposed inside the filling cavity (324). The drip clamping cylinder (32) has a limiting cavity (325) below the filling cavity (324). The upper end of the filling cavity (324) is connected to the limiting cavity (325), and the lower end has the leakage opening (323). The limiting cavity (325) has an elastic movable member (322) inside, and the elastic movable member (322) moves up and down inside the limiting cavity (325) to control the opening and closing of the leakage opening (323).

3. The magnetic grinding device for a titanium alloy implant according to claim 2, characterized in that: The drip clamping cylinder (32) has multiple arc-shaped guide grooves (326) spaced apart circumferentially on the inner wall of the limiting cavity (325).

4. The magnetic grinding device for a titanium alloy implant according to claim 3, characterized in that, The elastic movable element (322) includes: A ball bearing (3221) is disposed inside the limiting cavity (325); Elastic element (3222), multiple elastic elements (3222) are provided, one end of each elastic element (3222) is fixedly connected to the inner wall of the limiting cavity (325), and the other end is connected and fixed to the ball (3221). The diameter of the ball (3221) is larger than the diameter of the leakage opening (323).

5. The magnetic grinding device for a titanium alloy implant according to claim 1, characterized in that, The intermittent exhaust valve (31) includes: A valve body (311) is vertically disposed on the cover (3), and a flow passage (312) is provided inside the valve body (311); An elastic diaphragm (313) is embedded in the inner wall of the flow channel (312). The elastic diaphragm (313) has an arched surface (3131) and a cross-shaped slit (3132) at the arched surface (3131).

6. The magnetic grinding device for a titanium alloy implant according to claim 1, characterized in that, The elastic support base (22) includes: A fixing base (221) is provided, wherein a placement cavity (2211) is provided inside the fixing base (221); A sliding seat (222) has one end extending into the placement cavity (2211) and slidingly sealing with the fixed seat (221); An elastic airbag (223) is provided between the fixed seat (221) and the sliding seat (222). The elastic airbag (223) is located inside the placement cavity (2211) and is filled with inert gas.

7. The magnetic grinding device for a titanium alloy implant according to claim 5, characterized in that: The valve body (311) has an intake section (3111), a throat section (3112) and a diffuser section (3113) arranged sequentially along the intake direction. The intake section (3111), throat section (3112) and diffuser section (3113) are interconnected to form the flow passage (312). The inner wall of the air intake section (3111) is provided with a spiral flow guide groove (314).

8. A magnetic abrasive polishing method for titanium alloy implants, used to grind titanium alloy implant workpieces using a magnetic abrasive device as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. The titanium alloy dental implant workpiece is ultrasonically cleaned in acetone, anhydrous ethanol and deionized water in sequence, and then dried. S2. Add stainless steel magnetic needles, grinding fluid and distilled water to the grinding chamber (2) and mix them to form the grinding medium (21); S3. Fix the dried dental implant workpiece inside the grinding chamber (2) and immerse the dental implant in the grinding medium (21); S4. Control the drive disk (11) to rotate periodically and add oxidation aid liquid intermittently to drive the grinding media (21) to grind and polish the oral implant workpiece; S5. Rinse the polished dental implant workpiece sequentially with deionized water and anhydrous ethanol to obtain the finished titanium alloy implant.

9. The magnetic grinding and polishing method for a titanium alloy implant according to claim 8, characterized in that: The volume ratio of the grinding fluid to distilled water is 1:30 to 1:80, and the diameter of the stainless steel magnetic needle is 0.2 to 1.5 mm, and the length is 3 to 8 mm.

10. The magnetic grinding and polishing method for a titanium alloy implant according to claim 8, characterized in that: The grinding fluid contains an oxidation-resistant chelating agent, a surfactant, and a lubricant.

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