Electrolytic abrasive composite polishing device and method for SLM forming part

Abstract

The invention provides an SLM forming part electrolytic abrasive composite polishing device and method.The device comprises a container, a clamping mechanism, a fixed shaft, a driving mechanism and a power source device.According to the polishing method, an electrolyte solution mixed with abrasive serves as a polishing solution, the container is filled with the polishing solution, the SLM forming part is clamped by the clamping mechanism to be immersed in the polishing solution and located in the side direction of the fixed shaft, and the SLM forming part is formed. The SLM forming part is connected with the positive electrode of a power device through a fixed shaft, the inner wall of the container is connected with the negative electrode of the power device, and the power device is started to conduct electrolytic polishing on the SLM forming part; and meanwhile, the driving mechanism is used for driving the supporting piece of the clamping mechanism to revolve around a fixed shaft, driving the SLM forming piece on the supporting piece to rotate, matching with the container to enable a rotating speed difference to exist between the polishing solution and the SLM forming piece, and carrying out abrasive polishing on the SLM forming piece, so that surface polishing of the SLM forming piece or multiple forming pieces can be efficiently completed with high quality, manual polishing and grinding can be replaced, and the production efficiency is improved. And a new path is provided for efficient and precise polishing of additive manufacturing parts.

Description

Technical Field

[0001] The present invention belongs to the field of electrochemical composite polishing technology and equipment, and in particular relates to an electrolytic abrasive composite polishing device and method for SLM molded parts. Background Art

[0002] SLM technology is an additive manufacturing technique that uses a high-energy laser beam to selectively melt metal alloy powders on a two-dimensional cross-section and then build solid parts layer by layer from the bottom up. Compared to traditional molding methods such as casting and cutting, it offers advantages such as greater ability to manufacture complex structures and customized parts, high dimensional accuracy, and improved material properties and utilization. For example, titanium alloys have excellent biocompatibility and do not cause adverse reactions such as allergies. They also possess high wear and corrosion resistance. SLM technology allows for the personalized manufacture of titanium alloy dentures tailored to the patient's teeth and jaws, better meeting their needs. SLM is currently being applied in denture production, providing patients with improved denture solutions. However, SLM molding technology has drawbacks such as the "step effect," "spheroidization effect," and "powder adhesion," which can result in excessively rough surfaces in molded parts, such as titanium alloy dentures. Therefore, SLM-molded titanium alloy dentures must be polished to smooth the surface, reduce friction and bacterial adhesion during use, and improve performance, comfort, and aesthetics.

[0003] Currently, manual polishing is the most common method for post-processing the surfaces of SLM-molded parts, such as titanium alloy dentures. Manual technicians use electric polishers equipped with grinding heads and polishing agents to perform rough grinding, fine grinding, and polishing. This method is not only cumbersome and inefficient, but also poses drawbacks such as incomplete polishing and the health risks of polishing dust. Furthermore, polishing quality is highly dependent on the individual technician, and quality varies from person to person, making it difficult to achieve consistent, uniform results. Improper polishing can damage the denture and even affect oral health. Training a skilled manual technician requires years, resulting in significant time and labor costs.

[0004] Compared with mechanical polishing, electrochemical composite polishing technology has significant advantages in processing efficiency, surface quality, material adaptability, etc. For example, electrolytic abrasive composite polishing can thin the passivation film produced by the electrolytic reaction through the scraping effect of the abrasive, thereby improving the electrolytic polishing efficiency and further enhancing the polishing effect. However, the electrolytic abrasive composite polishing device and method in the prior art are applied to the polishing processing of SLM molded parts, and still have the following technical defects:

[0005] (1) Low overall polishing efficiency: Existing electrolytic abrasive composite polishing devices need to process zone by zone by moving the tool. For example, the electrolytic rotary ultrasonic magnetic composite polishing device disclosed in patent CN109986414A uses magnetic force to attract abrasives while electrolytic polishing, thereby forming a "grinding brush" to grind the workpiece with abrasives, resulting in a single polishing area. Only local surfaces of the molded parts can be polished, and the polishing position needs to be changed zone by zone to complete the overall polishing. Especially for molded parts with complex curved surfaces such as SLM-molded titanium alloy dentures with concave structures, this zone-by-zone processing mode is difficult to cover the entire surface, which will restrict the overall polishing efficiency.

[0006] (2) Poor overall polishing quality: The abrasive distribution and movement trajectory of the existing electrolytic abrasive composite polishing device are limited by the direction of the abrasive driving force. For example, the patent CN119589550A discloses a pulsed electrochemical mechanical composite polishing method that uses a multi-dimensional coupled vibration device to apply directional vibration to the abrasive in the polishing liquid during electrolytic polishing, driving the abrasive to impact and polish the processed surface. However, the movement path of the abrasive is limited by the direction of the magnetic lines of force or the vibration direction. The initial surface roughness of the SLM molded parts is relatively high. For example, SLM molded titanium alloy dentures have high hardness material characteristics compared to other polymer dentures. If the abrasive has insufficient scraping effect on the denture surface, it is difficult for the abrasive to penetrate into the complex structure, which will result in the passivation film being unable to be removed in time, the electrolytic reaction being limited, and the overall polishing quality being affected.

[0007] (3) It is difficult to meet the requirements of simultaneous processing of multiple SLM molded parts: Most existing electrolytic abrasive composite polishing devices are single-piece polishing designs. The fixture can only fix a single workpiece, and the position of the workpiece in the electrolyte flow channel is relatively fixed. When the workpiece is replaced, the processing flow needs to be interrupted, and the start-stop interval is long. When multiple workpieces are directly placed side by side, the adjacent workpieces will block the electrolyte flow path and affect the electrolytic reaction. Therefore, for SLM molded parts with smaller size and larger quantity, such as SLM-molded titanium alloy dentures, it will restrict their batch processing efficiency and production applications.

[0008] It can be seen that although SLM-molded titanium alloy dentures have broad development prospects, there is still a lack of effective surface polishing methods and equipment, which restricts the application of SLM-molded titanium alloy dentures in dentistry. Therefore, how to complete the surface polishing of SLM-molded parts efficiently and with high quality is still a major challenge. Summary of the Invention

[0009] The present invention aims to solve at least one of the above technical problems to a certain extent. The present invention provides an electrolytic abrasive composite polishing device and method for SLM molded parts, which can complete the surface polishing of SLM molded parts with high efficiency and high quality.

[0010] The technical solution adopted by the present invention to solve its technical problem is:

[0011] The first aspect of the present invention is to provide an electrolytic abrasive composite polishing device for SLM molded parts, comprising a container, a clamping mechanism, a fixed axis, a driving mechanism and a power supply device, wherein the container is filled with polishing liquid, and the polishing liquid is an electrolyte solution mixed with abrasives. The clamping mechanism is insulated and comprises at least one support member, wherein the support member is used to support the SLM molded part to be immersed in the polishing liquid and is located laterally to the fixed axis. The SLM molded part is connected to the positive pole of the power supply device through the fixed axis, and the inner wall of the container is connected to the negative pole of the power supply device. The driving mechanism is used to drive the support member to revolve around the fixed axis and drive the SLM molded part on the support member to rotate, and cooperates with the container to create a rotational speed difference between the polishing liquid and the SLM molded part.

[0012] In order to further facilitate the cooperation with the container to create a rotational speed difference between the polishing liquid and the SLM molded part, and to improve the scraping and abrasive polishing effect of the abrasive in the polishing liquid on the surface of the SLM molded part, in the preferred technical solution, the inner wall of the container is elliptical and the fixed axis is located at the center of the container.

[0013] In order to further facilitate the placement and removal of SLM molded parts and avoid splashing of polishing liquid during the rotation of SLM molded parts, in a preferred technical solution, the container includes an openable and closable cover, and the clamping mechanism and the driving mechanism are installed on the cover.

[0014] In order to further simplify the clamping and placing operations of SLM molded parts, especially to facilitate the picking and placing operations of multiple SLM molded parts processed simultaneously, and at the same time keep the SLM molded parts stably clamped during rotation and revolution, in a preferred technical solution, the clamping mechanism includes a first bracket with a support member and a second bracket, the second bracket is provided with a guide member passing through the first bracket, and an elastic support is provided between the guide member and the first bracket.

[0015] In order to further simplify the driving mechanism and make the device structure more compact, in the preferred technical solution, the driving mechanism includes a rotating shaft and a transmission mechanism, the rotating shaft is used to drive the clamping mechanism to revolve around the fixed axis, the transmission mechanism includes a fixed gear and a rotating gear, the fixed gear is coaxially connected to the fixed axis, the rotating gear cooperates with the fixed gear for transmission, and the gear shaft of the fixed gear is connected to the support member.

[0016] In order to further avoid mechanical wear or transmission impact on the transmission mechanism caused by the electrolytic polishing flow field mixed with abrasives, improve operational stability, and facilitate the placement of SLM molded parts, the connection between the fixed gear and the fixed shaft can adopt a detachable matching structure. In the preferred technical solution, the transmission mechanism is located in the clamping mechanism, and the fixed gear is provided with a mounting groove that cooperates with the fixed shaft and limits the rotation of the fixed gear.

[0017] In order to further facilitate the polishing process of multiple SLM molded parts at the same time and significantly improve the polishing efficiency, in the preferred technical solution, there are multiple rotating gears; the multiple rotating gears are distributed circumferentially along the fixed gear; and / or the multiple rotating gears are meshed with each other, and the innermost rotating gear is meshed with the fixed gear.

[0018] In order to further simplify the electrolysis configuration and device structure, in a preferred technical solution, the SLM molded part is connected to the positive electrode of the power supply device through a transmission mechanism and a fixed axis.

[0019] A second aspect of the present invention is to provide a method for electrolytic abrasive composite polishing of SLM molded parts, based on the above-mentioned electrolytic abrasive composite polishing device for SLM molded parts, the method comprising:

[0020] Step 1: Use an electrolyte solution mixed with abrasive as the polishing liquid, fill the container with the polishing liquid, use a clamping mechanism to clamp the SLM molded part, immerse it in the polishing liquid and position it on the side of the fixed axis;

[0021] Step 2: The SLM molded part is connected to the positive pole of the power supply device through the fixed axis, and the inner wall of the container is connected to the negative pole of the power supply device. The power supply device is started to electrolytically polish the SLM molded part. At the same time, the driving mechanism is used to drive the support to revolve around the fixed axis and drive the SLM molded part on the support to rotate. In cooperation with the container, a rotational speed difference is created between the polishing liquid and the SLM molded part, and the SLM molded part is abrasively polished.

[0022] In order to further improve the applicability and polishing effect of the device and method, in the preferred technical solution, the polishing liquid parameters are adjusted according to the polishing requirements; and / or, the revolution parameters of the SLM molded part are adjusted; and / or, the rotation parameters of the SLM molded part are adjusted; and / or, the electrical parameters of the power supply device; and / or, the polishing time.

[0023] A third aspect of the present invention is to provide an application of an electrolytic abrasive composite polishing device / method for SLM-molded parts, including application in polishing the surface of SLM-molded titanium alloy dentures.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The electrolytic abrasive composite polishing device / method proposed in the present invention uses an electrolyte solution mixed with abrasives as the polishing liquid, adopts the fixed axis of the SLM molded part to connect the positive electrode of the power supply device, which becomes the anode during electrolytic polishing, and adopts the inner wall of the container to connect the negative electrode of the power supply device, which becomes the cathode during electrolytic polishing. After applying voltage, the electrolytic reaction can be used to quickly polish the surface of SLM molded parts such as SLM-molded titanium alloy dentures; the driving mechanism drives the support member to revolve around the fixed axis to stir the polishing liquid, and cooperates with the container to create a rotational speed difference between the polishing liquid and the SLM molded part, and utilizes the scraping effect of the abrasive on the denture to thin the passivation film produced by the electrolytic reaction, thereby further improving the polishing quality and smoothness of the surface of the SLM molded part, and realizing efficient and high-quality polishing of the surface of the SLM molded part.

[0026] (2) The electrolytic abrasive composite polishing device / method proposed in the present invention utilizes a driving mechanism to drive the support member to revolve around a fixed axis, which is equivalent to driving the polished SLM molded part to revolve, and at the same time drives the SLM molded part on the support member to rotate, thereby ensuring that the entire surface of the SLM molded part can be polished, thereby improving the overall polishing efficiency and quality. The driving mechanism can further drive the clamping mechanism to revolve around the fixed axis through the rotating shaft, while the fixed gear and the rotating gear drive the rotating support seat to make the polished SLM molded part rotate and conduct electricity, thereby further simplifying the device structure.

[0027] (3) The electrolytic abrasive composite polishing device / method proposed in the present invention can further utilize a clamping mechanism to simultaneously clamp multiple SLM molded parts, and combined with a driving mechanism to drive multiple SLM molded parts to revolve and rotate, it can simultaneously complete the polishing processing of multiple SLM molded parts, and the polishing efficiency is doubled.

[0028] (4) The electrolytic abrasive composite polishing device / method proposed in the present invention has strong applicability and adjustability. According to the type of SLM molded parts and polishing requirements, one or more of the polishing liquid parameters, rotation parameters, electrical parameters, and polishing time during polishing can be adjusted to obtain a better polishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0030] Figure 1 is a structural diagram of embodiment 1 of the present invention;

[0031] Figure 2 1 is a schematic structural diagram of a clamping mechanism according to embodiment 1 of the present invention;

[0032] Figure 3 This is a schematic diagram of the interior of the second bracket according to embodiment 1 of the present invention;

[0033] Figure 4 This is a schematic diagram of the principle of denture rotation during polishing in Example 1 of the present invention. Figure 4 (a) is the upper view, Figure 4 (b) lower view;

[0034] Figure 5 This is a schematic diagram of the principle of electrolytic abrasive composite polishing on the surface of SLM-molded titanium alloy dentures;

[0035] Figure 6 It is a simulation model of the polishing liquid flow field during electrolytic abrasive composite polishing;

[0036] Figure 7 This is a cloud diagram of the polishing liquid flow rate distribution during electrolytic abrasive composite polishing in a circular container;

[0037] Figure 8 It is a cloud diagram of the polishing liquid flow rate distribution during electrolytic abrasive composite polishing in an elliptical container.

[0038] The label names are: motor 1, cover 2, rotating shaft 3, elastic support 4, first bracket 5, second bracket 6, denture 7, fixed shaft 8, container 9, rotation support seat 10, rotating gear 11, fixed gear 12, container side wall 13, polishing liquid 14, bracket 15, clamping mechanism 16, driving mechanism 17, power supply device 18, support member 19, transmission mechanism 20, mounting groove 21, square step 22, upper frame 23, lower cover 24. DETAILED DESCRIPTION

[0039] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "axial", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] Example 1:

[0043] In view of the current situation that the post-processing of the surface of SLM molded parts relies on manual polishing, and the existing abrasive composite polishing device can only polish the local surface of the molded parts and the abrasive driving force, overall polishing efficiency and polishing quality are poor, such as Figures 1 to 5 As shown, a preferred embodiment of the electrolytic abrasive composite polishing device for SLM molded parts of the present invention is provided. The polishing device includes a container 9, a clamping mechanism 16, a fixed axis 8, a driving mechanism 17 and a power supply device 18. The container 9 is filled with a polishing liquid 14, and the polishing liquid 14 is an electrolyte solution mixed with abrasive. The clamping mechanism 16 is insulated and includes at least one support member 19. The support member 19 is used to support the SLM molded part to be immersed in the polishing liquid 14 and is located on the side of the fixed axis 8. The SLM molded part is connected to the positive electrode of the power supply device 18 through the fixed axis 8, and the inner wall of the container 9 is connected to the negative electrode of the power supply device 18. The driving mechanism 17 is used to drive the support member 19 to revolve around the fixed axis 8 and drive the SLM molded part on the support member 19 to rotate, and cooperate with the container 9 to create a rotational speed difference between the polishing liquid 14 and the SLM molded part.

[0044] For example, the SLM molded part is an SLM-molded titanium alloy denture 7, and the surface of the denture 7 is polished as an example:

[0045] like Figure 1 As shown, the container 9 is a cup structure, the fixed axis 8 is installed at the bottom of the container 9, the clamping mechanism 16 is located inside the container 9 and is coaxially arranged with the fixed axis 8, and the support member 19 of the clamping mechanism 16 is used to clamp and support the denture 7. After clamping, the denture 7 is located at the side of the fixed axis 8, as shown in FIG. Figure 5As shown, the bottom of the container 9 is made of insulating material, and the material of the container side wall 13 is 304 stainless steel. The container side wall 13 is used to connect to the negative pole of the power supply device 18 during electrolytic polishing; the clamping mechanism 16 is made of insulating material, and the fixed shaft 8 in the container 9 is made of 304 stainless steel. During electrolytic polishing, the denture 7 can be conductive through the fixed shaft 8 and connected to the positive pole of the power supply device 18; an electrolyte solution mixed with abrasives is used as the polishing liquid 14, and the polishing liquid 14 is added to the container 9, so that the denture 7 is immersed in the polishing liquid 14. After the power supply device 18 is started, the denture 7 becomes the anode during electrolytic polishing by connecting to the positive pole, and the container side wall 13 becomes the cathode during electrolytic polishing by connecting to the negative pole. Under the action of the electrolytic reaction, the surface of the denture 7 is electrolytically polished, and after direct current is passed, the metal atoms on the anode surface lose electrons and dissolve. Because the current density is higher at the microscopic protrusions, they are preferentially dissolved, making the surface flat and smooth, and a high mirror finish can be obtained. The polishing efficiency is high and it is suitable for complex-shaped dentures 7, which can improve the corrosion resistance and mechanical properties of the denture 7. At the same time, it is environmentally friendly and has no mechanical stress residue. After starting the driving mechanism 17, the driving mechanism 17 drives the support 19 to revolve around the fixed axis 8 and drives the denture 7 on the support 19 to rotate. The polishing liquid 14 can be stirred by the support 19 and the denture 7 located on the side of the fixed axis 8, and cooperate with the container 9 to create a rotational speed difference between the polishing liquid 14 and the SLM molded part. During the process of the denture 7 revolving around the fixed axis 8 and rotating itself, it can scrape against the abrasive in the polishing liquid 14, and perform abrasive polishing on the surface of the denture 7, thereby further improving the polishing quality and smoothness of the surface of the denture 7.

[0046] On the one hand, compared with the existing electrolytic abrasive composite polishing device, which needs to process area by area through tool movement, and in view of the complexity of the surface of the SLM molded part, it is difficult to cover the entire surface and the overall polishing efficiency is low. During the electrolytic abrasive composite polishing process of the SLM molded part, the above-mentioned device can ensure that the electrolyte polishing liquid 14 containing abrasives covers the entire surface through the composite movement of the SLM molded part and the revolution around the fixed axis 8, thereby ensuring that the entire surface of the SLM molded part can be polished, thereby effectively improving the overall polishing efficiency. On the other hand, compared with the existing electrolytic abrasive composite polishing device, the abrasive movement path is limited by the direction of the driving force. During the electrolytic abrasive composite polishing process of the SLM molded part, the above-mentioned device can drive the SLM molded part to revolve around the fixed axis 8 through the driving mechanism 17, cooperate with the container 9 to form an asymmetric flow field, and force the polishing liquid 1 to move around the fixed axis 8 by destroying the symmetry of the flow field. 4. The fluid forms local vortices, increases the momentum exchange in different areas, promotes the turbulence enhancement of the polishing liquid 14, optimizes the fluid circulation path, avoids the situation where the SLM molded part and the polishing liquid 14 rotate at the same speed, thereby ensuring that the surface of the SLM molded part and the abrasive particles in the polishing liquid 14 are scratched, and strengthens the shearing effect of the abrasive on the SLM molded part. At the same time, the self-rotation of the SLM molded part can use centrifugal force to make the abrasive penetrate into complex structures such as depressions and layer gaps, thereby strengthening the abrasive scraping effect, and adapting to the requirements of the SLM molded part with high initial surface roughness, complex surface structure or partial high hardness material characteristics. Through the coordinated abrasive electrolytic polishing + SLM molded part revolution and rotation composite + polishing liquid 14 asymmetric flow field effect, it breaks through the existing technical bottleneck, can replace manual polishing and provide a new path for efficient and precise polishing of additively manufactured parts.

[0047] Furthermore, the inner wall of the container 9 is elliptical, and the fixed axis 8 is located at the center of the container 9, for example: Figure 1 As shown, the container 9 is an elliptical cup, and the fixed axis 8 is located at the center of the bottom of the elliptical cup. This forms an asymmetric flow field of the polishing liquid 14, so that there is a rotation speed difference between the polishing liquid 14 and the SLM molded part. In order to further verify the polishing effect of the proposed electrolytic abrasive composite polishing device on the denture 7, the flow field of the polishing liquid 14 in the container 9 was simulated using Fluent 17 simulation software. Figure 6 A simulation model was established, and the simulation conditions were: the length of the bracket 15 was 35 mm, the width was 10 mm, and the rotation speed was 120 rpm.

[0048] Under the same simulation conditions, when the inner wall of container 9 is circular, Figure 7This is a cloud diagram of the flow rate distribution of the polishing liquid 14 during electrolytic abrasive composite polishing in the circular container 9. As can be seen from the figure, when the bracket 15 rotates at a constant speed, it is equivalent to the support member 19 revolving around the fixed axis 8, stirring the polishing liquid 14 in the container 9. After entering a stable state, the polishing liquid 14 in the container 9 keeps rotating synchronously with the bracket 15. In this state, the denture 7 mounted on one end of the bracket 15 has the same rotation speed as the polishing liquid 14. The surface of the denture 7 will not be scratched by the abrasive particles in the polishing liquid 14, and no abrasive polishing effect can be produced.

[0049] When the inner wall of the container 9 is oval, Figure 8 This is a cloud diagram of the flow velocity distribution of the polishing liquid 14 during electrolytic abrasive composite polishing in the elliptical container 9. As can be seen from the figure, when the bracket 15 rotates at a constant speed, it is equivalent to the support 19 revolving around the fixed axis 8, stirring the polishing liquid 14 in the container 9. After entering a stable state, the polishing liquid 14 generates a local vortex in the elliptical container 9, that is, an asymmetric flow field. In this state, there is a rotational speed difference between the denture 7 mounted on one end of the bracket 15 and the polishing liquid 14. The surface of the denture 7 will be scraped by the abrasive in the polishing liquid 14, thereby achieving abrasive polishing of the surface of the denture 7. Through simulation and comparison of the flow field of the polishing liquid 14 in the container 9, it can be seen that the device proposed by the present invention can combine the revolution and rotation of the SLM molded part and the asymmetric flow field of the polishing liquid 14 to complete efficient and high-quality composite polishing of the surface of SLM molded parts such as the SLM-molded titanium alloy denture 7.

[0050] Compared to other approaches, the elliptical inner wall structure of container 9 further facilitates cooperation with container 9 to create a rotational speed difference between the polishing liquid 14 and the SLM molded part, thereby enhancing the scraping and polishing effect of the abrasive in the polishing liquid 14 on the surface of the SLM molded part. Similarly, to form an asymmetric flow field for the polishing liquid 14 during the revolution of the SLM molded part, the inner wall of container 9 can also adopt a non-circular inner wall cross-section, such as a square or irregular shape; and / or, add a stopper to the inner wall of container 9; and / or, adopt an asymmetric layout such as eccentrically setting the fixed axis 8; and / or, control the revolution speed; and / or change the revolution direction to further optimize the fluid circulation path, enhance turbulence, and avoid stirring blind spots.

[0051] Furthermore, the container 9 includes an openable and closable cover 2, and the clamping mechanism 16 and the driving mechanism 17 are mounted on the cover 2; for example, Figure 1As shown, the container 9 is a cup-shaped structure with an opening at the top, and the cover body 2 can be covered on the top of the container 9. The clamping mechanism 16 and the driving mechanism 17 are installed on the cover body 2. The material of the cover body 2 is an insulating material. When the denture 7 is placed, the clamping mechanism 16 can be taken out of the container 9 through the cover body 2, and the denture 7 is clamped on the clamping mechanism 16 and then placed in the container 9. The cover body 2 supports the driving mechanism 17 and the clamping mechanism 16, which can further facilitate the placement and removal of the SLM molded parts. At the same time, the cover body 2 is used to close the top of the container 9 to avoid splashing of the polishing liquid 14 due to stirring during the rotation of the SLM molded parts.

[0052] Furthermore, the clamping mechanism 16 includes a first bracket 5 having a support member 19 and a second bracket 6, the second bracket 6 is provided with a guide member passing through the first bracket 5, and an elastic support 4 is provided between the guide member and the first bracket 5; for example: Figures 1-2 As shown, the driving mechanism 17 includes a rotating shaft 3 which also serves as a guide member. The rotating shaft 3 is coaxially arranged with the fixed shaft 8. The first bracket 5 is sleeved on the rotating shaft 3. The elastic support 4 is a spring sleeved on the rotating shaft 3. The upper end of the spring contacts the cover body 2, and the lower end of the spring contacts the upper end of the first bracket 5. The second bracket 6 is fixedly installed at the lower end of the rotating shaft 3. The first bracket 5 can move axially along the rotating shaft 3, and the spring can support the first bracket 5 and the second bracket 6 to close. After pushing the first bracket 5 upward along the rotating shaft 3 and compressing the spring, the denture 7 can be placed on the support member 19 of the first bracket 5 and the second bracket 6. After releasing the first bracket 5, the denture 7 can be clamped between the first bracket 5 and the second bracket 6 under the elasticity of the spring. The materials of the rotating shaft 3, the first bracket 5 and the second bracket 6 are all insulating materials. By optimizing the clamping mechanism 16, the clamping and placing operations of the SLM molded parts can be further simplified, especially the picking and placing operations of multiple SLM molded parts processed simultaneously can be facilitated, while keeping the SLM molded parts stably clamped during rotation and revolution.

[0053] Furthermore, the driving mechanism 17 includes a rotating shaft 3 and a transmission mechanism 20, wherein the rotating shaft 3 is used to drive the clamping mechanism 16 to revolve around the fixed shaft 8, and the transmission mechanism 20 includes a fixed gear 12 and a rotating gear 11, wherein the fixed gear 12 is coaxially connected to the fixed shaft 8, and the rotating gear 11 cooperates with the fixed gear 12 for transmission, and the gear shaft of the fixed gear 12 is connected to the support member 19; for example: Figures 1 to 3As shown, the driving mechanism 17 includes a motor 1, which is mounted on the cover 2, a rotating shaft 3 passing through the cover 2 and connected to the main shaft of the motor 1, the rotating shaft 3 and the fixed shaft 8 are coaxially arranged, the cover 2 and the rotating shaft 3 are made of insulating materials, a fixed gear 12 coaxial with the rotating shaft 3 is provided below the second bracket 6, and a self-rotating support seat 10 is placed on the support frame of the first bracket 5 and the second bracket 6, and the self-rotating support seat 10 is coaxially connected to the gear shaft of the rotating gear 11. After the fixed gear 12 is coaxially connected to the fixed shaft 8, the polished denture 7 is placed on the self-rotating support seat 10 and is rotated by the first bracket under the action of the spring force. 5 is clamped with the second bracket 6. When the motor 1 is started, the motor 1 drives the first bracket 5 and the second bracket 6 to rotate axially around the rotating shaft 3 through the rotating shaft 3, that is, the driving support 19 revolves around the fixed shaft 8, and the fixed gear 12 remains stationary under the connection with the fixed shaft 8. The rotating gear 11 engages with the fixed gear 12 under the driving action of the rotating shaft 3 and the second bracket 6 and rotates, thereby driving the rotating support seat 10 and the polished denture 7 to rotate. In this way, the denture 7 can be connected to the positive electrode of the power supply through the fixed shaft 8 for electrolytic polishing, while the driving mechanism 17 is further simplified and the device structure is made more compact.

[0054] Furthermore, the transmission mechanism 20 is located in the clamping mechanism 16, and the fixed gear 12 is provided with a mounting groove 21 that cooperates with the fixed shaft 8 and limits the rotation of the fixed gear 12, for example: Figures 3-4 As shown, the second bracket 6 includes an upper frame body 23 and a lower cover body 24 that are matched and connected. The transmission mechanism 20 is built into the cavity formed by the upper frame body 23 and the lower cover body 24, which can further prevent the electrolytic polishing flow field mixed with abrasives from causing mechanical wear or transmission impact on the transmission mechanism 20, thereby improving the operating stability. At the same time, the second bracket 6 can limit the installation position of the fixed gear 12. The center of the fixed gear 12 is provided with a square hole as a mounting groove 21, and the upper end of the fixed shaft 8 is provided with a square step 22. The square hole and the square step 22 can be matched to achieve a detachable matching connection between the fixed gear 12 and the fixed shaft 8. When the motor 1 is started, the fixed gear 12 can remain stationary under the cooperation with the fixed shaft 8, which makes it easier to take out or put the clamping mechanism 16 into the container 9. The clamping mechanism 16 can be quickly separated or matched with the fixed shaft 8, thereby facilitating the placement of SLM molded parts and improving processing efficiency.

[0055] Furthermore, there are multiple rotating gears 11; multiple rotating gears 11 are distributed circumferentially along the fixed gear 12; and / or multiple rotating gears 11 are meshed with each other, and the innermost rotating gear 11 is meshed with the fixed gear 12; for example, Figure 3 and Figure 4As shown, the first bracket 5 and the second bracket 6 are both composed of a plurality of support members 19 arranged at intervals along the circumference of the rotating shaft 3, and a row of rotating gears 11 is provided under each support member 19. The innermost rotating gear 11 is meshed with the fixed gear 12 in the center, and the adjacent rotating gears 11 are meshed with each other. At least one rotating support seat 10 is provided on the support member 19. For example: when there is a rotating support seat 10, the outermost rotating gear 11 of each support member 19 is coaxial with the rotating support seat 10, and together they form a rotating gear train. The outermost rotating gear 11 can be driven in sequence through the meshing action, driving the rotating support seat 10 and the denture 7 thereon to rotate. On the one hand, through the revolution of multiple support members 19 and the denture 7 and the strengthening of the stirring effect of the polishing liquid 14, on the other hand, multiple dentures 7 can be clamped on the clamping mechanism 16 at the same time and maintain revolution and rotation, which can further facilitate the polishing process of multiple SLM molded parts at the same time, and significantly improve the polishing efficiency.

[0056] Furthermore, the SLM molded part is connected to the positive electrode of the power supply device 18 through the transmission mechanism 20 and the fixed shaft 8, for example, Figure 3 and Figure 4 As shown, the fixed gear 12, rotating gear 11, self-rotating support seat 10, and fixed shaft 8 are all made of 304 stainless steel. After the fixed shaft 8 in the container 9 is connected to the positive pole of the power supply, the conductivity of the fixed gear 12, rotating gear 11, and self-rotating support seat 10 can make the polished denture 7 become the anode during electrolytic polishing. Compared with the configuration of additional conductive wiring, it is necessary to consider the rotational connection problem of the wire relative to the fixed shaft 8. Using the transmission mechanism 20 as a conductive structure can further simplify the electrolysis configuration and device structure and improve the electrolysis reliability.

[0057] Example 2:

[0058] A preferred embodiment of the electrolytic abrasive composite polishing method for SLM molded parts of the present invention is based on the electrolytic abrasive composite polishing device for SLM molded parts described in Example 1, and the method includes:

[0059] Step 1: Use an electrolyte solution mixed with abrasive as the polishing liquid 14, fill the container 9 with the polishing liquid 14, use the clamping mechanism 16 to clamp the SLM molded part, immerse it in the polishing liquid 14 and position it on the side of the fixed axis 8; specifically, for example:

[0060] The denture 7 is clamped by a clamping mechanism 16: the denture 7 to be polished is placed on the rotating support seat 10 and is clamped by the first bracket 5 and the second bracket 6 under the action of the spring force; a glycol-based neutral salt solution mixed with abrasive is used as the polishing liquid 14, the polishing liquid 14 is injected into the container 9, the cover 2 is covered, the fixed gear 12 is matched with the fixed shaft 8, the denture 7 is immersed in the polishing liquid 14 and is located laterally to the fixed shaft 8.

[0061] Step 2: The SLM molded part is connected to the positive electrode of the power supply device 18 through the fixed axis 8, and the inner wall of the container 9 is connected to the negative electrode of the power supply device 18. The power supply device 18 is started to electrolytically polish the SLM molded part. At the same time, the driving mechanism 17 drives the support member 19 to revolve around the fixed axis 8 and drives the SLM molded part on the support member 19 to rotate. The driving mechanism 17 cooperates with the container 9 to create a rotational speed difference between the polishing liquid 14 and the SLM molded part, and the SLM molded part is abrasively polished. Specifically, for example:

[0062] Connect the power supply device 18: the side wall 13 of the container is made of 304 stainless steel and is connected to the negative pole of the power supply device 18; the fixed gear 12, the rotating gear 11, and the self-rotating support seat 10 are all made of 304 stainless steel, which are used to electrically connect the polished denture 7 to the positive pole of the power supply device 18; the cover body 2, the rotating shaft 3, the first bracket 5, and the second bracket 6 are all made of insulating materials; start the power supply device 18, so that the polished denture 7 becomes the anode during electrolytic polishing, and the side wall 13 of the container becomes the cathode during electrolytic polishing. After the voltage is applied, an electrolytic reaction occurs between the surface of the denture 7 and the side wall of the cup body, and the surface of the denture 7 is electrolytically polished.

[0063] Start the motor 1, and drive the first bracket 5 and the second bracket 6 to rotate through the rotating shaft 3 to stir the polishing liquid 14. Since the horizontal cross-section of the container 9 is elliptical, local eddy currents will occur when the polishing liquid 14 rotates and flows in the container 9, so that there is a rotational speed difference between the polishing liquid 14 and the SLM molded part, which causes the denture 7 to be scraped against the abrasive in the polishing liquid 14, and abrasive polishing is performed on the surface of the denture 7, thinning the passivation film produced by the electrolytic reaction, and improving the electrolytic polishing efficiency. Moreover, due to the driving action of the gear train composed of the rotating gear 11 and the fixed gear 12, the polished denture 7 rotates with the rotating support seat 10, ensuring that the entire surface of the denture 7 can be polished, further improving the overall polishing quality and smoothness of the surface of the denture 7, and realizing efficient and high-quality electrolytic abrasive composite polishing processing of the surface of the SLM-molded titanium alloy denture 7, which is conducive to expanding the application of the SLM-molded titanium alloy denture 7 in dentistry.

[0064] In order to further improve the applicability of the full-time, further, according to the polishing requirements, such as the denture type and polishing requirements, the device selection or method parameters are adjusted, including:

[0065] Adjust the polishing liquid 14 parameters; for example, adjust the abrasive material, concentration and particle size in the polishing liquid 14 to match the rough polishing for rapid defect removal or the fine polishing requirements for surface refinement; adjust the electrolytic composition, temperature or viscosity to avoid oxidation of the titanium alloy surface due to excessive temperature.

[0066] And / or, adjust the revolution parameters of the SLM molded part; for example, by adjusting the motor 1, adjust the speed / direction of the axial revolution of the SLM molded part around the fixed axis 8. Low speed is suitable for low viscosity polishing liquid 14 to avoid abrasive sedimentation, and high speed enhances the turbulence effect, which is suitable for high viscosity polishing liquid 14 or simultaneous processing of multiple SLM molded parts.

[0067] And / or, adjust the rotation parameters of the SLM molded part; for example, by adjusting the gear ratio of the fixed gear 12 and the rotating gear 11, the speed ratio of the revolution speed ω1 to the rotation speed ω2 is adjusted, and the centrifugal force is used to make the abrasive penetrate into the SLM molded part, or balance the polishing efficiency and surface uniformity. For complex hard structures, the effect of the abrasive on hidden areas is enhanced through high speed ratio and strong stirring flow field.

[0068] And / or, electrical parameters of the power supply device 18; for example, by adjusting the voltage, current density, waveform, etc., it is suitable for rough polishing to quickly dissolve the protrusions on the surface of the SLM molded part, or fine polishing to refine the surface.

[0069] and / or, polishing time; for example, by adjusting the voltage of the power supply device 18 in coordination with the polishing time, the dominant role of electrolytic polishing / abrasive polishing in the composite polishing can be adjusted, and the electrolytic action can be used to dominantly improve the mirror finish / utilize / abrasive polishing to dominantly thin the passivation film produced by the electrolytic reaction, thereby comprehensively improving the efficiency and quality of electrolytic polishing.

[0070] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electrolytic abrasive composite polishing device for SLM molded parts, characterized in that: The invention comprises a container (9), a clamping mechanism (16), a fixed axis (8), a driving mechanism (17) and a power supply device (18); the container (9) is filled with a polishing liquid (14), the polishing liquid (14) being an electrolyte solution mixed with an abrasive; the clamping mechanism (16) is insulated and comprises at least one supporting member (19); the supporting member (19) is used to support an SLM molded part immersed in the polishing liquid (14) and located laterally to the fixed axis (8); the SLM molded part is connected to the positive electrode of the power supply device (18) through the fixed axis (8); the inner wall of the container (9) is connected to the negative electrode of the power supply device (18); the driving mechanism (17) is used to drive the supporting member (19) to revolve around the fixed axis (8) and drive the SLM molded part on the supporting member (19) to rotate; and the driving mechanism (17) cooperates with the container (9) to ensure a rotational speed difference between the polishing liquid (14) and the SLM molded part.

2. The electrolytic abrasive composite polishing device for SLM molded parts according to claim 1, characterized in that: The inner wall of the container (9) is elliptical, and the fixed axis (8) is located at the center of the container (9).

3. The electrolytic abrasive composite polishing device for SLM molded parts according to claim 1, characterized in that: The container (9) comprises an openable and closable cover (2), and the clamping mechanism (16) and the driving mechanism (17) are mounted on the cover (2).

4. The electrolytic abrasive composite polishing device for SLM molded parts according to claim 1, characterized in that: The clamping mechanism (16) comprises a first bracket (5) having a support member (19) and a second bracket (6), wherein the second bracket (6) is provided with a guide member passing through the first bracket (5), and an elastic support (4) is provided between the guide member and the first bracket (5).

5. The electrolytic abrasive composite polishing device for SLM molded parts according to claim 1, characterized in that: The driving mechanism (17) comprises a rotating shaft (3) and a transmission mechanism (20). The rotating shaft (3) is used to drive the clamping mechanism (16) to revolve around the fixed shaft (8). The transmission mechanism (20) comprises a fixed gear (12) and a rotating gear (11). The fixed gear (12) is coaxially connected to the fixed shaft (8). The rotating gear (11) cooperates with the fixed gear (12) for transmission. The gear shaft of the fixed gear (12) is connected to a support member (19).

6. The electrolytic abrasive composite polishing device for SLM molded parts according to claim 5, characterized in that: The transmission mechanism (20) is located in the clamping mechanism (16), and the fixed gear (12) is provided with a mounting groove (21) that cooperates with the fixed shaft (8) and limits the rotation of the fixed gear (12).

7. The electrolytic abrasive composite polishing device for SLM molded parts according to claim 5, characterized in that: There are multiple rotating gears (11); the multiple rotating gears (11) are distributed along the circumference of the fixed gear (12); and / or the multiple rotating gears (11) are meshed with each other, and the innermost rotating gear (11) is meshed with the fixed gear (12).

8. The electrolytic abrasive composite polishing device for SLM molded parts according to claim 5, characterized in that: The SLM molded part is connected to the positive pole of a power supply device (18) through a transmission mechanism (20) and a fixed shaft (8).

9. A method for electrolytic abrasive composite polishing of SLM molded parts, characterized in that: The electrolytic abrasive composite polishing device for SLM molded parts according to any one of claims 1 to 8 comprises: Step 1: Using an electrolyte solution mixed with abrasive as a polishing liquid (14), filling the polishing liquid (14) into a container (9), and using a clamping mechanism (16) to clamp the SLM molded part, immersing it in the polishing liquid (14) and locating it on the side of the fixed axis (8); Step 2: The SLM molded part is connected to the positive electrode of the power supply device (18) through the fixed shaft (8), and the inner wall of the container (9) is connected to the negative electrode of the power supply device (18). The power supply device (18) is started to electrolytically polish the SLM molded part. At the same time, the driving mechanism (17) drives the support member (19) to revolve around the fixed shaft (8) and drives the SLM molded part on the support member (19) to rotate. The drive mechanism (17) cooperates with the container (9) to create a rotation speed difference between the polishing liquid (14) and the SLM molded part, and the SLM molded part is abrasively polished.

10. The electrolytic abrasive composite polishing method for SLM molded parts according to claim 9, characterized in that: According to the polishing requirements, the polishing liquid (14) parameters are adjusted; and / or, the revolution parameters of the SLM molded part are adjusted; and / or, the rotation parameters of the SLM molded part are adjusted; and / or, the electrical parameters of the power supply device (18); and / or, the polishing time.

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