Dental-specific metal 3D printer

Abstract

A dental-specific metal 3D printer, comprising a main frame (6); an optical platform (2) and a mounting platform (5), fixed on the main frame (6); a light path system (1), fixed on the optical platform (2); a rotatable forming mechanism (3), comprising a first forming cabin (304) and a second forming cabin (315), the top of the first forming cabin (304) and the top of the second forming cabin (315) being respectively provided with light-transmitting glass (303); and a driving mechanism (4), fixed on the mounting platform (5), the forming mechanism (3) being transmittingly connected to the driving mechanism (4). Laser emitted from the light path system (1) can pass through the light-transmitting glass (303) to be irradiated into the first forming cabin (304) or the second forming cabin (315). The 3D printer can be applicable to the processing requirements of both titanium alloy powder and cobalt-chromium alloy powder, solving the problems of large occupation area, high requirements for mounting environments, and huge expense that are involved in companion devices, specializing in the supply of titanium alloy powder and cobalt-chromium alloy powder, in dental factories.

Description

A metal 3D printer specifically for dentistry Technical Field

[0001] The present invention relates to the field of 3D printing technology, and in particular to a metal 3D printer specifically for dentistry. Background Art

[0002] 3D printing technology involves computer-controlled layering of various "printing materials" such as metal, ceramic, plastic, and sand, ultimately transforming a computer blueprint into a physical object. There are many different types of 3D printing technology, with metal 3D printing being widely used in dentistry. This involves laser selectively melting metal layer by layer to form the final product. Due to the human body's adaptability to different metals, titanium and cobalt-chromium alloys are widely used in dentistry.

[0003] Currently, dental factories routinely manufacture titanium and cobalt-chromium alloys into powders, using laser-selective, layer-by-layer melting to create the desired objects (dentures, etc.) using 3D printing technology. Due to customer demand, titanium and cobalt-chromium powders are required in every dental factory. However, a single 3D printer can only print and shape one type of metal powder. Dental factories need to specifically supply the corresponding supporting equipment for titanium and cobalt-chromium powders, requiring multiple devices to be installed. This requires a large footprint, a demanding installation environment, and significant costs.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to provide a metal 3D printer specifically for dentistry, which can meet the processing needs of both titanium alloy powder and cobalt-chromium alloy powder. It solves the problem that dental factories need to specially supply supporting equipment for titanium alloy powder and cobalt-chromium alloy powder, and the problem that multiple devices occupy a large area, have high requirements for the installation environment, and are extremely expensive.

[0006] To solve the above problems, the present invention provides a dental metal 3D printer, comprising a main frame, and further comprising:

[0007] An optical platform and a mounting platform fixed on the main frame, wherein the optical platform is located above the mounting platform;

[0008] An optical path system fixed on an optical platform;

[0009] A rotatable molding mechanism disposed between the optical platform and the mounting platform, the molding mechanism comprising a first molding chamber and a second molding chamber, wherein the tops of the first molding chamber and the second molding chamber are respectively provided with light-transmitting glass;

[0010] A driving mechanism fixed on the mounting platform, and the forming mechanism is transmission-connected to the driving mechanism;

[0011] When the driving mechanism drives the forming mechanism to rotate, any piece of the light-transmitting glass can be rotated to be directly below the light exit hole of the optical path system;

[0012] The laser light emitted from the light exit hole of the optical system can penetrate the light-transmitting glass and irradiate into the first molding chamber or the second molding chamber to sinter the metal powder;

[0013] When any one of the light-transmitting glasses is rotated to be directly below the light-emitting hole of the optical path system, the central axis of the light-transmitting glass and the light-emitting hole of the optical path system coincide with each other;

[0014] The forming mechanism further comprises:

[0015] The bottom surface is connected to the working platform of the driving mechanism, and the working platform is provided with four mounting holes;

[0016] A sealed box and an isolation box fixed on the working platform, wherein the isolation box is located inside the sealed box, and two long holes parallel to the working platform are symmetrically provided on the side wall of the isolation box;

[0017] An isolation plate fixed between the sealed box and the isolation box, the isolation plate and the isolation box dividing the sealed box into a first molding chamber and a second molding chamber; two pieces of light-transmitting glass are provided on the top surface of the sealed box;

[0018] The first material cylinder, the second material cylinder, the first forming cylinder, and the second forming cylinder are mounted on the top in four mounting holes of the work platform, and each of the first material cylinder, the second material cylinder, the first forming cylinder, and the second forming cylinder is provided with a controllable lifting piston; the first material cylinder and the first forming cylinder are located below the first forming cabin, the second material cylinder and the second forming cylinder are located below the second forming cabin, and the first forming cylinder and the second forming cylinder are respectively located directly below two pieces of light-transmitting glass;

[0019] A motor bracket fixed in the isolation box;

[0020] A first motor is fixed on the motor bracket;

[0021] A powder spreading knife is fixed at the end of the output shaft of the first motor, and the two ends of the powder spreading knife extend into the first molding chamber and the second molding chamber respectively from two long holes on the outer wall of the isolation box; the first motor drives the powder spreading knife to swing, and the swing amplitude of the powder spreading knife covers the upper surfaces of the first material cylinder, the second material cylinder, the first molding cylinder and the second molding cylinder.

[0022] Furthermore, the optical platform is provided with a light through hole, and the light exit hole of the optical path system coincides with the central axis of the light through hole of the optical platform, and the laser emitted from the light exit hole of the optical path system is irradiated downward from the light through hole.

[0023] Furthermore, the center axis of the light-transmitting glass above the first forming cylinder coincides with the center axis of the light-transmitting glass above the second forming cylinder; and the center axis of the light-transmitting glass above the second forming cylinder coincides with the center axis of the light-transmitting glass above the second forming cylinder.

[0024] Furthermore, the four mounting holes of the working platform are distributed on a circumference around the central axis of the first motor output shaft.

[0025] Furthermore, two annular glass pressing plates are fixed on the top surface of the sealed box body, and the two glass pressing plates are respectively pressed against the edges of the two light-transmitting glasses.

[0026] Furthermore, two notches are opened on the side wall of the sealed box body, and two doors are hinged at the two notches. The doors are also fixed to the sealed box body by buckles, and the two doors are respectively located in the first molding chamber and the second molding chamber.

[0027] Furthermore, the driving mechanism includes:

[0028] A core shaft with its upper end fixed to the bottom surface of the working platform;

[0029] A support sleeve is sleeved on the core shaft, and the lower end of the support sleeve is installed through the mounting platform;

[0030] a first bearing and a second bearing mounted between the support sleeve and the core shaft;

[0031] A large gear is provided below the mounting platform and is fixed to the lower end surface of the core shaft;

[0032] A motor base fixed to the bottom surface of the mounting platform;

[0033] a second motor fixed on the motor base;

[0034] A small gear is fixed to the end of the output shaft of the second motor, and the small gear is meshed with the large gear.

[0035] Furthermore, the inner wall of the lower end of the support sleeve is provided with a step; the outer wall of the core shaft is provided with an upper step and a lower step; the inner ring of the first bearing is fixed on the upper step of the core shaft, and the outer ring of the first bearing is fixed by pressing down through the bearing flange, and the bearing flange is fixed on the top surface of the support sleeve; the outer ring of the second bearing is fixed on the step of the inner wall of the support sleeve, and the inner ring of the second bearing is fixed on the lower step of the core shaft.

[0036] The advantages of the present invention are that the 3D printer described in the present invention is provided with a first molding chamber and a second molding chamber, and these two molding chambers can process and mold titanium alloy powder and cobalt-chromium alloy powder respectively, without the need for special supply of supporting equipment for titanium alloy powder and cobalt-chromium alloy powder, effectively reducing product manufacturing costs by more than 40%, and at the same time effectively controlling the limitation of site size, and realizing the non-stop working mode of the printer, and thus having good promotion potential in the dental industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic structural diagram of the dental metal 3D printer of the present invention.

[0038] FIG2 is a partially cutaway schematic diagram of the forming mechanism of the dental metal 3D printer according to the present invention.

[0039] FIG3 is a schematic cross-sectional view of the drive mechanism of the dental metal 3D printer according to the present invention.

[0040] In the figure: 1. Optical path system; 2. Optical platform; 3. Molding mechanism; 301. Sealed box; 302. Glass pressure plate; 303. Translucent glass; 304. First molding chamber; 305. Isolation box; 306. Motor bracket; 307. Working platform; 308. First material cylinder; 309. First molding cylinder; 310. Second molding cylinder; 311. Second material cylinder; 312. Powder knife; 313. First motor; 314. Isolation plate; 315. Second molding chamber; 4. Driving mechanism; 401. Core shaft; 402. First bearing; 403. Support sleeve; 404. Second bearing; 405. Big gear; 406. Second motor; 407. Small gear; 408. Motor seat; 409. Bearing flange; 5. Mounting platform; 6. Main frame. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0042] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0043] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to 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, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0045] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0046] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0047] As shown in Figure 1, this embodiment provides a dental metal 3D printer, including a main frame 6, on which an optical platform 2 and a mounting platform 5 are fixed, and the optical platform 2 is located above the mounting platform 5; an optical path system 1 is fixed on the optical platform 2; a molding mechanism 3 is fixed between the optical platform 2 and the mounting platform 5, and the molding mechanism 3 includes a first molding chamber 304 and a second molding chamber 315, and the tops of the first molding chamber 304 and the second molding chamber 315 are respectively provided with a transparent glass 303, and a driving mechanism 4 is fixed on the mounting platform 5; the molding mechanism 3 is connected to the driving mechanism 4 by transmission; when the driving mechanism 4 drives the molding mechanism 3 to rotate, the first molding chamber 304 and the second molding chamber 315 are respectively located below the optical path system 1, and the transparent glass 303 can be rotated to directly below the light exit hole of the optical path system 1. The laser emitted by the light exit hole of the optical path system 1 can be irradiated into the first molding chamber 304 or the second molding chamber 315 through the transparent glass 303, and the metal powder is sintered and molded.

[0048] The optical path system 1 used in this embodiment includes a laser. In the optical path system 1, the laser is preferably output through collimation, and a laser beam is emitted from its light output hole through the deflection of the galvanometer and the focusing action of the field lens arranged in the optical path system 1, and it is ensured that the emitted laser beam can be focused on the position where the metal powder is melted and formed in the first molding chamber 304 and the second molding chamber 315.

[0049] In one embodiment of the present invention, the optical platform 2 is provided with a light hole, and the light exit hole of the optical path system 1 coincides with the central axis of the light exit hole of the optical platform 2, ensuring that the laser emitted from the light exit hole of the optical path system 1 can be irradiated downward from the light hole.

[0050] In one embodiment of the present invention, when any piece of the light-transmitting glass 303 is rotated to be directly below the light-emitting hole of the optical path system 1, the light-transmitting glass 303 coincides with the central axis of the light-emitting hole of the optical path system 1, ensuring that the laser emitted from the light-emitting hole of the optical path system 1 can be irradiated from the light-transmitting glass 303 into the first molding chamber 304 and the second molding chamber 315.

[0051] In one embodiment of the present invention, as shown in Figure 2, the molding mechanism 3 includes a working platform 307, the bottom surface of the working platform 307 is connected to the driving mechanism 4, and the working platform 307 has four mounting holes; a sealed box 301 and an isolation box 305 are fixed on the working platform 307, and the isolation box 305 is located in the sealed box 301, and two long holes parallel to the working platform 307 are symmetrically provided on the side wall of the isolation box 305; an isolation plate 314 is fixed between the sealed box 301 and the isolation box 305, and the isolation plate 314 and the isolation box 305 separate the sealed box 301 into a first molding chamber 304 and a second molding chamber 315; two pieces of light-transmitting glass 303 are provided on the top surface of the sealed box 301; a first material cylinder 308 and a second material cylinder are respectively installed in the four mounting holes of the working platform 307 311, the first molding cylinder 309 and the second molding cylinder 310, and the first molding cylinder 308, the second molding cylinder 311, the first molding cylinder 309 and the second molding cylinder 310 are respectively provided with a controllable lifting piston; the first molding cylinder 308 and the first molding cylinder 309 are located below the first molding cabin 304, the second molding cylinder 311 and the second molding cylinder 310 are located below the second molding cabin 315, and the first molding cylinder 309 and the second molding cylinder 310 are respectively located directly below the two pieces of light-transmitting glass 303; the motor bracket 306 is fixed in the isolation box 305; the first motor 313 is fixed on the motor bracket 306; the powder spreading knife 312 is fixed to the end of the output shaft of the first motor 313, and the two ends of the powder spreading knife 312 extend into the first molding cabin 304 and the second molding cabin 315 from two long holes on the outer wall of the isolation box 305 respectively;

[0052] The controllable lift piston can move up and down. A cylinder is located below the controllable lift piston, and the bottom of the controllable lift piston is connected to the end of the cylinder's piston rod. The cylinder can push the controllable lift piston up and down. The cylinder can also be replaced with an electric telescopic rod to achieve the same controllable lift piston up and down movement.

[0053] The size of the two long holes on the outer wall of the isolation box 305 determines the swing amplitude of the powder spreading knife 312, but the forward and reverse rotation of the output shaft of the first motor 313 drives the powder spreading knife 312 to swing, and it must be ensured that the swing amplitude of the powder spreading knife 312 covers the upper surface of the first material cylinder 308, the second material cylinder 311, the first forming cylinder 309 and the second forming cylinder 310. Then, the swing of the powder spreading knife 312 can scrape the metal powder provided by the first material cylinder 308 to the first forming cylinder 309 and spread the metal powder flat on the controllable lifting piston of the first forming cylinder 309. The swing of the powder spreading knife 312 can also scrape the metal powder provided by the second material cylinder 311 to the second forming cylinder 310 and spread the metal powder flat on the controllable lifting piston of the second forming cylinder 310.

[0054] In addition, the first material cylinder 308 and the second material cylinder 311 are used to hold titanium alloy powder and cobalt-chromium alloy powder, and the first forming cylinder 309 and the second forming cylinder 310 are used to complete the forming of titanium alloy powder and cobalt-chromium alloy powder respectively. In order to ensure that the laser passing through the transparent glass 303 can be accurately focused on the flat metal powder on the first forming cylinder 309 and the second forming cylinder 310, the first forming cylinder 309 coincides with the central axis of the transparent glass 303 above the first forming cylinder 309; the second forming cylinder 310 coincides with the central axis of the transparent glass 303 above the second forming cylinder 310.

[0055] There are two notches on the side wall of the sealed box body 301, and two hatches 316 are hinged at the two notches. The hatches 316 are also fixed to the sealed box body 301 by snaps, and the two hatches 316 are respectively located in the first molding cabin 304 and the second molding cabin 315; when the user needs to clean the first molding cabin 304 and the second molding cabin 315, or when the user needs to add powder to the first material cylinder 308 and the second material cylinder 311, or when the user needs to take out the physical objects molded in the first molding cylinder 309 and the second molding cylinder 310, the hatch 316 can be opened to complete the above operations.

[0056] Since the four mounting holes of the working platform 307 are distributed on the circumference of the central axis of the output shaft of the first motor 313, this can ensure that when the powder knife 312 swings, it can accurately scrape the metal powder provided by the first material cylinder 308 to the first forming cylinder 309, and can also accurately scrape the metal powder provided to the second forming cylinder 310.

[0057] In this embodiment, two annular glass pressure plates 302 are fixed to the top surface of the sealed box 301. The two glass pressure plates 302 respectively press against the edges of the two light-transmitting glasses 303. Two stepped holes are provided in the top plate of the sealed box 301. The two light-transmitting glasses 303 are clamped onto the annular steps of the two stepped holes on the top plate of the sealed box 301. The upper glass pressure plate 302 presses against the light-transmitting glasses 303 to secure them and ensure the sealing of the sealed box 301.

[0058] When the molding mechanism 3 is in operation, the driving mechanism 4 drives the working platform 307 to rotate, that is, drives the entire molding mechanism 3 to rotate, so that the light-transmitting glass 303 on the first molding chamber 304 is located directly below the light exit hole of the optical path system 1, and the controllable lifting piston in the first material cylinder 308 lifts the titanium alloy powder above the upper surface of the working platform 307. At the same time, the controllable lifting piston of the second material cylinder 311 lifts the cobalt-chromium alloy powder above the upper surface of the working platform 307. The output shaft of the first motor 313 rotates to drive the powder spreading knife 312 to rotate. Then, one end of the powder spreading knife 312 can scrape the titanium alloy powder above the upper surface of the working platform 307 to the first molding cylinder 309, and ensure that the titanium alloy powder at the first molding cylinder 309 is spread flat on the controllable lifting piston of the first molding cylinder 309. At the same time, the other end of the powder spreading knife 312 can scrape the cobalt-chromium alloy powder above the upper surface of the working platform 307 to the second molding cylinder 310, and ensure that the cobalt-chromium alloy powder at the second molding cylinder 310 is spread flat on the second molding cylinder 310. , and then the first motor 313 drives the powder knife 312 to rotate to the initial position; the laser emitted by the light exit hole of the optical path system 1 shines through the transparent glass 303 on the titanium alloy powder spread on the first forming cylinder 309, which can melt the titanium alloy powder and solidify it to form a layer of the target object, and then the controllable lifting piston in the first forming cylinder 309 is lowered a certain distance; then the driving mechanism 4 drives the entire forming mechanism 3 to rotate, so that the transparent glass 303 on the second forming chamber 315 is located directly below the light exit hole of the optical path system 1, and the laser emitted by the light exit hole of the optical path system 1 shines through the transparent glass 303 on the cobalt-chromium alloy powder spread on the second forming cylinder 310, which can melt the cobalt-chromium alloy powder and solidify it to form a layer of the target object, and then the controllable lifting piston in the second forming cylinder 310 is lowered a certain distance; repeat the above process, complete the molding of the target objects in the first molding chamber 304 and the second molding chamber 315 layer by layer, and obtain the target products of two materials.

[0059] The above working method is an alternating molding working method, which can basically obtain the target products of two materials at the same time; there is also a successive molding working method.

[0060] The above-mentioned alternating molding works as follows: when the molding mechanism 3 is in operation, the driving mechanism 4 drives the working platform 307 to rotate, that is, drives the entire molding mechanism 3 to rotate, so that the light-transmitting glass 303 on the first molding chamber 304 is located directly below the light exit hole of the optical path system 1, and the controllable lifting piston in the first material cylinder 308 lifts the titanium alloy powder above the upper surface of the working platform 307, and the output shaft of the first motor 313 rotates to drive the powder spreading knife 312 to rotate, so that one end of the powder spreading knife 312 can scrape the titanium alloy powder above the upper surface of the working platform 307 to the first molding cylinder 309. And ensure that the titanium alloy powder at the first forming cylinder 309 is spread on the controllable lifting piston of the first forming cylinder 309, and then the first motor 313 drives the powder spreading knife 312 to rotate to the initial position; the laser emitted by the light outlet hole of the optical path system 1 is irradiated on the titanium alloy powder spread on the first forming cylinder 309 through the light-transmitting glass 303, which can melt the titanium alloy powder and solidify it to form a layer of the target object, and then the controllable lifting piston in the first forming cylinder 309 is lowered a certain distance; repeat the above process, and complete the molding of the target object layer by layer in the first molding chamber 304 to obtain the titanium alloy material The target product of the quality is obtained; if it is also necessary to obtain a product made of cobalt-chromium alloy separately, the entire molding mechanism 3 can be driven to rotate by the driving mechanism 4, so that the light-transmitting glass 303 on the second molding chamber 315 is located directly below the light exit hole of the optical path system 1, and the controllable lifting piston of the second material cylinder 311 lifts the cobalt-chromium alloy powder above the upper surface of the working platform 307, and the other end of the powder spreading knife 312 can scrape the cobalt-chromium alloy powder above the upper surface of the working platform 307 to the second molding cylinder 310, and ensure that the cobalt-chromium alloy powder at the second molding cylinder 310 is spread flat on the second molding cylinder 310 On the controllable lifting piston, the laser emitted from the light outlet of the optical path system 1 shines through the transparent glass 303 onto the cobalt-chromium alloy powder spread flat on the second forming cylinder 310, thereby melting the cobalt-chromium alloy powder and solidifying it to form a layer of the target object. Then, the controllable lifting piston in the second forming cylinder 310 descends a certain distance. The above process is repeated to complete the molding of the target object layer by layer in the second molding chamber 315, and the target product made of cobalt-chromium alloy can be obtained. The advantage of this working method is that while one molding chamber is performing molding work, the other molding chamber can be cleaned, fed with materials, and other treatments.

[0061] Here, the powder spreading knife 312 does not contact the work platform 307, and maintains a certain distance to avoid interference and friction between the powder spreading knife 312 and the work platform 307. The distance between the powder spreading knife 312 and the work platform 307 can be determined according to user needs and workpiece material. The distance between the two is preferably 0-0.1mm, and can also be greater than 0.1mm.

[0062] In one embodiment of the present invention, as shown in FIG3 , the driving mechanism 4 includes a core shaft 401, the upper end of the core shaft 401 is fixed to the bottom surface of the working platform 307; a support sleeve 403 is sleeved on the outer wall of the core shaft 401, a flange is sleeved on the outer wall of the support sleeve 403, and the flange on the outer wall of the support sleeve 403 is fixed to the mounting platform 5 by a bolt connection pair; in addition, a through hole is opened on the mounting platform 5, and the lower end of the support sleeve 403 is inserted into the through hole of the mounting platform 5; between the support sleeve 403 and the core shaft 401 The first bearing 402 and the second bearing 404 are installed so that the support sleeve 403 can stably support the core shaft 401, and the core shaft 401 can rotate stably relative to the support sleeve 403. A large gear 405 is provided below the mounting platform 5 and fixed to the lower end surface of the core shaft 401. A motor base 408 is fixed to the bottom surface of the mounting platform 5. A second motor 406 is fixed to the motor base 408. A small gear 407 is fixed to the end of the output shaft of the second motor 406, and the small gear 407 meshes with the large gear 405. When the second motor 406 is in operation, the output shaft of the second motor 406 rotates, driving the small gear 407 to rotate. The small gear 407 drives the large gear 405 to rotate, thereby driving the core shaft 401 to rotate. The core shaft 401 then drives the forming mechanism 3 to rotate.

[0063] Specifically, the inner wall of the lower end of the support sleeve 403 is provided with a step; the outer wall of the core shaft 401 is provided with an upper step and a lower step; the inner ring of the first bearing 402 is fixed on the upper step of the core shaft 401, and the outer ring of the first bearing 402 is pressed down and fixed by the bearing flange 409, and the bearing flange 409 is fixed on the top surface of the support sleeve 403; the outer ring of the second bearing 404 is fixed on the step of the inner wall of the support sleeve 403, and the inner ring of the second bearing 404 is fixed on the lower step of the core shaft 401; the first bearing 402 The second bearing 404 clamps the core shaft 401 through the upper and lower steps of the core shaft 401, and at the same time, the step of the lower end inner wall of the support sleeve 403 provides support for the second bearing 404; in addition, the bearing flange 409 can provide support for the first bearing 402, and the bearing flange 409 can clamp the first bearing 402, so that the bearing flange 409 and the steps on the inner wall of the support sleeve 403 limit the up and down movement of the first bearing 402 and the second bearing 404, and at the same time, the first bearing 402 and the second bearing 404 limit the up and down movement of the core shaft 401.

[0064] When it is necessary to obtain products of two materials at the same time, the user first adds titanium alloy powder to the first material cylinder 308 and cobalt-chromium alloy powder to the second material cylinder 311; starts the second motor 406, which is transmitted through the driving mechanism 4, thereby driving the molding mechanism 3 to rotate, so that the light-transmitting glass 303 on the first molding chamber is located directly below the light exit hole of the optical path system 1, and the controllable lifting piston in the first material cylinder 308 lifts the titanium alloy powder above the upper surface of the working platform 307, while the controllable lifting piston of the second material cylinder 311 lifts the cobalt-chromium alloy powder above the upper surface of the working platform 307; starts the first motor 313, drives the powder knife 312 to rotate, and one end of the powder knife 312 scrapes the titanium alloy powder to the first molding cylinder 309, and spreads the titanium alloy powder flat on the controllable lifting piston of the first molding cylinder 309, while the other end of the powder knife 312 scrapes the cobalt-chromium alloy powder to the second molding cylinder 310, and makes The cobalt-chromium alloy powder is spread on the controllable lifting piston of the second forming cylinder 310, and then the first motor 313 is reversed to drive the powder knife 312 to rotate to the initial position; the light outlet hole of the optical path system 1 emits a laser to melt and mold the titanium alloy powder spread on the first forming cylinder 309 to obtain a layer of the target object, and then the controllable lifting piston in the first forming cylinder 309 is lowered a certain distance; then, the second motor 406 is started again, and the drive mechanism 4 drives the entire forming mechanism 3 to rotate, so that the light-transmitting glass 303 on the second forming chamber 315 is located directly below the light outlet hole of the optical path system 1, and the light outlet hole of the optical path system 1 emits a laser to melt and mold the cobalt-chromium alloy powder spread on the second forming cylinder 310 to obtain a layer of the target object, and then the controllable lifting piston in the second forming cylinder 310 is lowered a certain distance; repeat the above process, gradually complete the molding of each layer of the target object, and obtain the target product.

[0065] When a titanium alloy product is required, the user first adds titanium alloy powder to the first material cylinder 308; starts the second motor 406, which is transmitted through the drive mechanism 4, thereby driving the forming mechanism 3 to rotate, so that the transparent glass 303 on the first forming chamber is located directly below the light outlet of the optical path system 1, and the controllable lifting piston in the first material cylinder 308 lifts the titanium alloy powder above the upper surface of the working platform 307; starts the first motor 313, drives the powder knife 312 to rotate, and one end of the powder knife 312 scrapes the titanium alloy powder to the first forming cylinder 309, and the titanium alloy powder is spread evenly on the controllable lifting piston of the first forming cylinder 309, and then the first motor 313 is reversed to drive the powder knife 312 to rotate to the initial position; the light outlet of the optical path system 1 emits a laser to melt the titanium alloy powder spread on the first forming cylinder 309 to form a layer of the target object, and then the controllable lifting piston in the first forming cylinder 309 is lowered a certain distance; repeats the above process, gradually completing the forming of each layer of the target object, and then a titanium alloy product can be obtained.

[0066] When it is necessary to obtain a product made of cobalt-chromium alloy alone, the user first adds cobalt-chromium alloy powder to the second material cylinder 311; starts the second motor 406, which is driven by the driving mechanism 4 to drive the entire molding mechanism 3 to rotate, so that the light-transmitting glass 303 on the second molding chamber 315 is located directly below the light exit hole of the optical path system 1, and the controllable lifting piston of the second material cylinder 311 lifts the cobalt-chromium alloy powder above the upper surface of the working platform 307; starts the first motor 313 to drive the powder spreading knife 312 to rotate, and the other end of the powder spreading knife 312 spreads the cobalt-chromium alloy powder to the upper surface of the working platform 307. The powder is scraped to the second forming cylinder 310, and the cobalt-chromium alloy powder is spread flat on the controllable lifting piston of the second forming cylinder 310, and then the first motor 313 is reversed to drive the powder spreading knife 312 to rotate to the initial position; the light outlet hole of the optical path system 1 emits a laser to melt the cobalt-chromium alloy powder spread flat on the second forming cylinder 310 to form a layer of the target object, and then the controllable lifting piston in the second forming cylinder 310 is lowered a certain distance; the above process is repeated to gradually complete the forming of each layer of the target object, and a product made of cobalt-chromium alloy can be obtained.

Claims

1. A metal 3D printer for dentistry, characterized in that: Comprising a main frame (6), the 3D printer further comprises: An optical platform (2) and a mounting platform (5) fixed on a main frame (6), wherein the optical platform (2) is located above the mounting platform (5); An optical path system (1) fixed on an optical platform (2); a rotatable molding mechanism (3) disposed between the optical platform (2) and the mounting platform (5), the molding mechanism (3) comprising a first molding chamber (304) and a second molding chamber (315), and light-transmitting glass (303) is respectively disposed on the top of the first molding chamber (304) and the second molding chamber (315); A driving mechanism (4) fixed on the mounting platform (5), and the molding mechanism (3) is drivingly connected to the driving mechanism (4); When the driving mechanism (4) drives the forming mechanism (3) to rotate, any piece of the light-transmitting glass (303) can be rotated to the position directly below the light exit hole of the optical path system (1); The laser light emitted from the light exit hole of the optical path system (1) can penetrate the light-transmitting glass (303) and irradiate into the first molding chamber (304) or the second molding chamber (315), thereby sintering the metal powder; When any one of the light-transmitting glasses (303) is rotated to be directly below the light-emitting hole of the optical path system (1), the central axis of the light-transmitting glass (303) coincides with the central axis of the light-emitting hole of the optical path system (1); The forming mechanism (3) further comprises: The bottom surface is connected to a working platform (307) of the driving mechanism (4) through transmission, and the working platform (307) is provided with four mounting holes; A sealed box (301) and an isolation box (305) fixed on a working platform (307), wherein the isolation box (305) is located inside the sealed box (301), and two long holes parallel to the working platform (307) are symmetrically provided on the side wall of the isolation box (305); An isolation plate (314) is fixed between the sealed box (301) and the isolation box (305), wherein the isolation plate (314) and the isolation box (305) separate the sealed box (301) into a first molding chamber (304) and a second molding chamber (315); two light-transmitting glasses (303) are arranged on the top surface of the sealed box (301); The first material cylinder (308), the second material cylinder (311), the first molding cylinder (309) and the second molding cylinder (310) are installed at the top in four installation holes of the working platform (307), and the first material cylinder (308), the second material cylinder (311), the first molding cylinder (309) and the second molding cylinder (310) are respectively provided with controllable lifting pistons inside; the first material cylinder (308) and the first molding cylinder (309) are located below the first molding chamber (304), the second material cylinder (311) and the second molding cylinder (310) are located below the second molding chamber (315), and the first molding cylinder (309) and the second molding cylinder (310) are respectively located directly below two pieces of light-transmitting glass (303); A motor support (306) fixed in the isolation box (305); A first motor (313) is fixed on the motor bracket (306); A powder spreading knife (312) is fixed at the end of the output shaft of the first motor (313), and the two ends of the powder spreading knife (312) extend into the first molding chamber (304) and the second molding chamber (315) respectively from two long holes on the outer wall of the isolation box (305); the first motor (313) drives the powder spreading knife (312) to swing, and the swing amplitude of the powder spreading knife (312) covers the upper surfaces of the first material cylinder (308), the second material cylinder (311), the first molding cylinder (309) and the second molding cylinder (310).

2. The dental metal 3D printer according to claim 1, characterized in that: The optical platform (2) is provided with a light through hole, and the light exit hole of the optical path system (1) coincides with the central axis of the light through hole of the optical platform (2), and the laser emitted by the light exit hole of the optical path system (1) is irradiated downward from the light through hole.

3. The dental metal 3D printer according to claim 1, characterized in that: The central axis of the light-transmitting glass (303) above the first forming cylinder (309) and the second forming cylinder (310) coincides; the central axis of the light-transmitting glass (303) above the second forming cylinder (310) coincides.

4. The dental metal 3D printer according to claim 1, characterized in that: The four mounting holes of the working platform (307) are distributed on a circumference around the central axis of the output shaft of the first motor (313).

5. The dental metal 3D printer according to claim 1, characterized in that: Two annular glass pressing plates (302) are fixed on the top surface of the sealed box body (301), and the two glass pressing plates (302) are respectively pressed tightly against the edges of two light-transmitting glasses (303).

6. The dental metal 3D printer according to claim 1, characterized in that: The sealed box body (301) has two notches on its side wall, and two hatches (316) are hinged at the two notches. The hatches (316) are also fixed to the sealed box body (301) via buckles, and the two hatches (316) are respectively located in the first molding chamber (304) and the second molding chamber (315).

7. The dental metal 3D printer according to claim 1, characterized in that: The driving mechanism (4) comprises: A mandrel (401) with an upper end fixed to the bottom surface of the working platform (307); A support sleeve (403) sleeved on the core shaft (401), wherein the lower end of the support sleeve (403) is penetrated and installed on the installation platform (5); A first bearing (402) and a second bearing (404) mounted between the support sleeve (403) and the core shaft (401); A large gear (405) is arranged below the mounting platform (5), and the large gear (405) is fixed on the lower end surface of the core shaft (401); A motor base (408) fixed to the bottom surface of the mounting platform (5); A second motor (406) fixed on a motor base (408); A small gear (407) is fixed to the end of the output shaft of the second motor (406), and the small gear (407) is meshed with the large gear (405).

8. The dental metal 3D printer according to claim 7, characterized in that: The inner wall at the lower end of the support sleeve (403) is provided with a step; the outer wall of the core shaft (401) is provided with an upper step and a lower step; the inner ring of the first bearing (402) is fixed on the upper step of the core shaft (401), and the outer ring of the first bearing (402) is pressed down and fixed by a bearing flange (409), and the bearing flange (409) is fixed on the top surface of the support sleeve (403); the outer ring of the second bearing (404) is fixed on the step of the inner wall of the support sleeve (403), and the inner ring of the second bearing (404) is fixed on the lower step of the core shaft (401).

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