CN111531880A - Multimode multi-material photocuring 3D printing equipment - Google Patents

Multimode multi-material photocuring 3D printing equipment Download PDF

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Publication number
CN111531880A
CN111531880A CN202010259580.1A CN202010259580A CN111531880A CN 111531880 A CN111531880 A CN 111531880A CN 202010259580 A CN202010259580 A CN 202010259580A CN 111531880 A CN111531880 A CN 111531880A
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China
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fixedly connected
light
printing
screws
axis
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CN202010259580.1A
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Chinese (zh)
Inventor
谢祺晖
王兆龙
段辉高
单武斌
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Hunan University
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Hunan University
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Priority to CN202010259580.1A priority Critical patent/CN111531880A/en
Publication of CN111531880A publication Critical patent/CN111531880A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20Apparatus for additive manufacturing; Details thereof or accessories therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10Processes of additive manufacturing
    • B29C64/106Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
    • B29C64/124Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B29C64/255Enclosures for the building material, e.g. powder containers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30Auxiliary operations or equipment
    • B29C64/307Handling of material to be used in additive manufacturing
    • B29C64/321Feeding
    • B29C64/336Feeding of two or more materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y30/00Apparatus for additive manufacturing; Details thereof or accessories therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00Auxiliary operations or equipment, e.g. for material handling

Abstract

The invention discloses a multi-mode multi-material photocuring 3D printing device which comprises a Z-axis connector, a trough clamp, a trough fastening screw, an X-axis lead screw sliding table, a forming bottom plate, a support column, a bottom plate, an optical machine, a liquid storage tank, an extrusion sliding groove, a Y-axis lead screw sliding table, an extrusion motor frame, an extrusion motor, a printing head support, a printing head, a forming platform fastening screw, a forming platform leveling limiter, a forming platform coupler, a Z-axis lead screw sliding table, an XY-axis coupler and a feeding pipe. The processing equipment has high processing dimensional precision and is suitable for processing three-dimensional entities with complex internal structures; the dual-material printing method has two photocuring forming principles, and can perform dual-material printing under the conditions of low contact and low pollution of materials; the matrix material is fast to form, a new product model machine in the research and development stage can be rapidly manufactured, and the research and development period of the product is shortened; and the device also has the advantages of convenient use, low manufacturing cost, large scanning area and the like.

Description

Multimode multi-material photocuring 3D printing equipment
Technical Field
The invention relates to a multi-mode multi-material photocuring 3D printing device and method, belongs to the technical field of 3D printing, and particularly relates to a multi-axis 3D micro-nano processing device.
Background
With the rapid development of 3D printing and micro-nano technology, in order to meet the requirements of different fields and industries, researchers at home and abroad have developed various micro-nano scale 3D printing processes, printing materials and rotary partition walls in recent years, and the printing materials and the rotary partition walls are applied to various fields and industries. The 3D printing, namely Rapid Prototyping (RP) technology is an additive manufacturing technology based on a discrete accumulation idea, namely a bottom-up material accumulation manufacturing method, which adopts a computer technology to connect and accumulate materials layer by layer according to a three-dimensional digital model of a part so as to manufacture a solid part.
(Digital technology, SLA process namely stereolithography (Stereo photo-curing rapid prototyping technology is a 3D printing technology which is widely applied at present). The technology takes photosensitive resin liquid as a raw material, and the photosensitive property of the resin enables the material to be subjected to polymerization reaction to be solidified after being irradiated by Light (mostly ultraviolet wave band) with a specific wave band.
Currently, home and abroad photocuring 3D printing equipment is basically a single liquid photosensitive resin material or is molded in a single manner, such as a single photosensitive resin material adopted in patent patents CN201811544607.0 and CN 201610945088.3; the patent 201610321716.0 divides the transparent trough into two parts to realize the compound molding of double-material liquid photosensitive resin. From the angle of mechanical property and color, the mechanical property and the functional characteristic of color parts and different positions are realized, the mutual pollution of materials in the printing process is reduced as much as possible, the technical requirement on photocuring 3D printing is further improved, and the significance of realizing multi-material multi-mode printing is great.
Disclosure of Invention
The invention aims to provide multi-axis 3D micro-nano machining equipment which is high in machining size precision and suitable for machining three-dimensional entities with complex internal structures; the dual-material printing method has two photocuring forming principles, and can perform dual-material printing under the conditions of low contact and low pollution of materials; the matrix material is fast to form, a new product model machine in the research and development stage can be rapidly manufactured, and the research and development period of the product is shortened; and the device also has the advantages of convenient use, low manufacturing cost, large scanning area and the like.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a multiaxis 3D receives processing equipment a little, including Z axle connector (1), silo (2), silo clamp (3), silo fastening screw (4), X axle lead screw slip table (5), shaping bottom plate (6), pillar (7), bottom plate (8), ray machine (9), liquid storage pot (10), extrude spout (11), Y axle lead screw slip table (12), extrude motor frame (13), extrude motor (14), beat printer head support (15), beat printer head (16), shaping platform (17) and shaping platform fastening screw (18), shaping platform leveling limiter (19), shaping platform shaft coupling (20), Z axle lead screw slip table (21), XY axle shaft coupling (22) and conveying pipe (23).
Furthermore, a Z-axis screw rod sliding table (21) is fixedly connected with a Z-axis connector (1) through a screw, the Z-axis connector (1) is fixedly connected with a forming bottom plate (6) through a screw, a strip-shaped hole is formed in a forming platform leveling limiter (18), the screw penetrates through the strip-shaped hole to be connected with a screw hole in the forming platform (17), when the screw is not locked, the forming platform (17) can adjust the relative parallelism with the bottom surface of the material groove (2), the screw is locked after proper adjustment, and the forming platform (17) is fixedly connected with the forming platform leveling limiter (18); the forming platform leveling limiter (18) is matched with the forming platform coupler (19) through a shaft and is in fastening connection through the aid of a forming platform fastening screw (18); the forming platform coupling (19) is fixedly connected with the Z-axis screw rod sliding table (21) through screws, and the forming platform (17) can move in the Z-axis direction. The forming bottom plate (6) is in fastening connection with the bottom plate (8) through screws and pillars (7); the liquid storage tank (10) is arranged on the extrusion chute (11), and the printing head (16) is communicated with the liquid storage tank (10); an extrusion motor (14) is arranged on an extrusion motor frame (13), and a printing head support (15) is in fastening fit with a Y-axis screw rod sliding table (12) through screws.
Furthermore, the Z-axis screw rod sliding table (21), the X-axis screw rod sliding table (5) and the Y-axis screw rod sliding table (12) are screw rod sliding tables with the same structure, and in the screw rod sliding tables, a stepping motor (5-1) is fixedly connected with the guide rail frame (5-6) through screws; the screw rod (5-4) forms shaft fit with the guide rail bracket (5-6) through two bearings (5-3). The screw rod (5-4) is tightly connected with the stepping motor (5-1) through a coupling (5-2). The guide rail (5-5) and the guide rail frame (5-6) form interference fit, and form clearance fit with the slide block (5-7); the sliding blocks (5-7) are in threaded fit with the screw rods (5-4), and the sliding blocks (5-7) can move along the axial direction of the screw rod sliding table.
Furthermore, the two X-axis lead screw sliding tables (5) and the Y-axis lead screw sliding table (12) are respectively and fixedly connected with the XY-axis coupler (22) through screws, so that the two X-axis lead screw sliding tables (5) are parallel to each other and are axially vertical to the Y-axis lead screw sliding table (12), and the Y-axis lead screw sliding table (12) can move along the axial direction of the X-axis lead screw sliding table (5); the X-axis screw rod sliding table (5) is fixedly connected with the forming bottom plate (6) through screws.
Furthermore, the trough clamp (3) is fixedly connected with a light machine top plate (8-7) of the light machine (9) through screws, and the trough (2) and the trough clamp (3) are in clearance fit; the bottom of the trough (2) is a hydrophobic high-transparency film with a Teflon coating, and the trough (2) can be taken out from the gap, so that the operation is convenient. The trough clamping screw (4) is tightly connected with the trough (2) through a thread through hole at two sides of the trough clamp (3).
Furthermore, in the printing nozzle device, the printing head (16) consists of a printing head rear cover (16-1), heat-conducting glue (16-2), a thermoelectric semiconductor refrigerating sheet (16-3), UV lamp beads (16-4), a throat pipe (16-5), a nozzle (16-6), a printing head front cover (16-7) and a feeding pipe head (16-8). The rear printing head cover (16-1) is tightly matched with the printing head support (15) through a screw, the outer side of the throat (16-5) is provided with a thread, the inner side through hole is provided with a Teflon coating, and the rear printing head cover (16-1) is tightly connected through an external thread; the thermoelectric semiconductor refrigerating sheet (16-3) is fixed on the rear cover (16-1) of the printing head through gluing; the through hole on the inner side of the feeding pipe head (16-8) is provided with a Teflon coating and is fixedly connected with the rear cover (16-1) of the printing head through threads, and the through hole on the inner side is aligned with the throat pipe (16-5); the front cover (16-7) of the printing head is fixedly connected with the rear cover of the printing head through screws, and the whole gap is filled with heat-conducting glue (16-2); the printing head (16) can move in the axial direction of the Y-axis screw rod sliding table (12), and the Y-axis screw rod sliding table (12) can move in the axial direction of the X-axis screw rod sliding table (5), so that the printing head (16) can move to any point in the stroke range of the two-axis screw rod sliding table on the XY plane, and materials are deposited into preset patterns in the plane.
Furthermore, in the feeding and extruding device, an extruding motor frame (13), an extruding slide groove frame (11-4) and a lower liquid storage groove clamp (10-1) are respectively and fixedly connected with a forming bottom plate (6) through screws; the sliding rail (11-1) and the extrusion sliding groove frame (11-4) form interference fit, and form clearance fit with the sliding block (11-3); the half rack (11-2) is tightly connected with the sliding block (12-3) through a screw; the extrusion motor (14-1) is fixedly connected with the extrusion motor frame (13) through a screw, and the extrusion gear (14-2) is in interference fit with the extrusion motor (14-1) and is meshed with the half rack (11-2) to form gear teeth; the front end of the liquid storage tank (10-4) is provided with a threaded hole, the tank body is provided with a fixing groove corresponding to the shapes of the lower liquid storage tank clamp (10-1) and the upper liquid storage tank clamp (10-3), the upper liquid storage tank clamp (10-3) is fixedly connected with the lower liquid storage tank clamp (10-1) through a liquid storage tank tightening screw (10-2), the liquid storage tank (10-4) is fixed, and the liquid storage tank (10-4) can be quickly taken down by loosening the liquid storage tank tightening screw (10-2), so that the cleaning and the material replacement are convenient; a groove is formed in the extrusion piston (10-7), a sealing rubber ring (10-6) is arranged in the groove, and the interference sealing fit with the liquid storage tank (10-4) is realized through the action of the sealing rubber ring (10-6); the head of the piston push rod (10-5) is provided with external threads, the tail of the piston push rod is welded with a push plate, and the piston push rod is fixedly connected with the extrusion piston (10-7) through threads; the push rod sleeve (11-5) is provided with a groove which is adaptive to the shape of the push plate at the tail part of the piston push rod (10-5), the push rod sleeve is tightly connected with the slide block (11-3) through a screw, and the push plate at the tail part of the piston push rod (10-5) and the groove form clearance fit and can be taken out and put in quickly. The feeding pipe head (10-8) is internally provided with a through hole which is fixedly connected with a threaded hole at the front end of the liquid storage tank (10-4) through threads. The feeding pipe (23) is a hollow flexible Teflon hose and is connected with the feeding pipe head (10-8) and the feeding pipe head (16-8) in an interference fit manner.
The basic working mode of the feeding extrusion and printing spray head device is as follows: the extrusion motor (14) is controlled to rotate to drive the extrusion gear (14-2) to rotate, so that the half rack (11-2) meshed with the extrusion gear moves forwards to push the sliding block (11-3) tightly matched with the rack to move forwards, the sliding block (11-3) pushes the push rod sleeve (11-5) tightly matched with the sliding block to move forwards, the push rod sleeve (11-5) pushes the push plate at the tail part of the piston push rod (10-5), so that the piston push rod (10-5) pushes the extrusion piston (10-7) to move forwards, thereby leading the liquid material to obtain certain pressure, the ink is fed to a feeding pipe head (16-8) in a printing head (16) through a feeding pipe head (10-8) and a feeding pipe (23) at the front end of a liquid tank (10-4) and enters a throat pipe (16-5) from the feeding pipe head (16-8); the thermoelectric semiconductor refrigerating sheet (16-3) can adjust the temperature, and the temperature of the liquid material is adjusted through the heat-conducting glue (16-2), so that the viscosity of the material is proper; the liquid continues upwards due to the pressure until it is applied to the forming surface by means of the nozzle (16-6); the liquid material is self-adhesive to adhere to the molding surface, and the material is cured by irradiation of UV lamp beads (16-4).
Furthermore, in the optical forming device, a radiating aluminum sheet (9-1) is fixedly connected with a bottom plate (8) through screws, a UV lamp substrate (9-10) is fixedly connected with the radiating aluminum sheet (9-1) through screws, UV lamp beads (9-9) are welded on the UV lamp substrate (9-10), a light-gathering aluminum sheet (9-2) is formed by welding four light-gathering aluminum sheets, the upper end of the light-gathering aluminum sheet is folded, a through hole is formed in the light-gathering aluminum sheet, and the light-gathering aluminum sheet is fixedly connected with a Fresnel lens (9-3) through screws; the Fresnel lens (9-3) is formed by gluing a lens and a lens frame, the lens frame is provided with a threaded hole and is fixedly connected with the fly-eye lens (9-4) through a single-head copper column (9-6); the fly-eye lens group (9-4) is formed by gluing a lens and a lens frame, the lens frame is provided with a threaded hole and is fixedly connected with the gray control liquid crystal screen (9-5) through a single-head copper column (9-6); the gray control liquid crystal screen (9-5) is formed by gluing a backlight panel removed by 5.5 inches and a screen frame, wherein the frame is provided with a threaded hole and is fixedly connected with a light machine top plate (9-7) through a single-head copper column (9-6) and a screw. The shape control liquid crystal screen (9-8) is a liquid crystal screen with a removed backlight plate of 5.5 inches, and is glued on the top plate (9-7) of the optical machine; the polishing machine top plate (9-7) is fixedly connected with the forming bottom plate (6) through screws; the length of the support column (7) is controlled, so that the bottom surface of the light-gathering aluminum sheet (9-2) is in no forced contact with the top surface of the UV lamp substrate (9-10).
The basic working principle of the optical molding device is as follows: the UV lamp beads (9-9) are electrified to emit ultraviolet rays with a certain wavelength, and the ultraviolet rays are reflected by the light-gathering aluminum sheets (9-2) and irradiated to the surface of the Fresnel lens (9-3); the Fresnel lens (9-3) refracts the scattered light rays into parallel light rays, and the scattered light rays are further filtered out through the fly eye lens group (9-4); when the liquid crystal screen displays a pure black image, the liquid crystal screen is completely opaque, when the liquid crystal screen displays a pure white image, the liquid crystal screen is completely transparent, when the liquid crystal screen displays a gray image, the light intensity can be attenuated to a certain extent by penetrating through the liquid crystal screen, and the attenuation degree is determined by the gray level of the image; the gray control liquid crystal screen (9-5) can regulate and control the light rays emitted by the fly-eye lens group (9-4) by displaying a preset gray image with a shape, so that the light intensity attenuation which can be regulated and controlled can be generated according to the requirement; the shape control liquid crystal screen (9-8) displays a preset black and white pattern with a shape, the attenuated light is partially shielded by the shape control liquid crystal screen (9-8) to form light spots with the same shape, and the light spots are projected to a molding surface to partially cure the material.
Compared with the prior art, the technical scheme has the following advantages:
1. the equipment can realize the printing of two materials and can meet the requirements of different mechanical properties and colors of parts.
2. The equipment realizes two printing modes, wherein one material is formed through surface, so that the printing can be performed quickly, and the efficiency is improved. The other material is formed by points, and the printable surface is formed into high-viscosity materials or special functional materials which are difficult to print, so that the waste of the materials is less, the materials can be recovered, and more valuable materials can be saved.
3. The device changes the single downward extrusion mode of the existing extrusion type printing technology, depends on the molding surface by viscosity through upward extrusion, reduces the adverse effect of gravity on the extrusion material, particularly prevents the edge warping phenomenon of the molding surface with a large inclination angle, and effectively improves the 3D printing quality.
4. The two material liquid tanks of the device are separately arranged and are conveyed to the molding surface through different channels, so that the two liquid materials are not in direct contact with each other, and mutual pollution is prevented.
5. The device can separately control the shape and the gray scale through the double liquid crystal screens, thereby increasing the definition of the edge of the graph and simultaneously reducing the edge saw teeth generated by the size of the pixel point.
Drawings
FIG. 1 is a block diagram of the apparatus of the present invention.
Fig. 2 is a front view of the device of the present invention.
Fig. 3 is a top view of the apparatus of the present invention.
Fig. 4 is a structural view of the screw sliding table.
Fig. 5 is a structural view of the optical molding apparatus.
Fig. 6 is a structural view of the print head.
Fig. 7 is a structural view of the feed extrusion apparatus.
FIG. 8 is a structural view of a liquid storage groove portion.
Fig. 9 is a front view of an optical molding apparatus.
Fig. 10 is a partial configuration view of the optical molding apparatus.
Fig. 11 is a partial configuration view of the optical molding apparatus.
Detailed Description
The invention is further described below with reference to the above figures.
As shown in fig. 1, a Z-axis screw rod sliding table (21) is tightly connected with a Z-axis connector (1) through screws, the Z-axis connector (1) is tightly connected with a forming bottom plate (6) through screws, a strip-shaped hole is formed in a forming platform leveling limiter (18), the screws penetrate through the strip-shaped hole to be connected with screw holes in a forming platform (17), when the screws are not locked, the forming platform (17) can adjust the relative parallelism with the bottom surface of a material groove (2), the screws are locked after the screws are adjusted properly, and the forming platform (17) is tightly connected with the forming platform leveling limiter (18); the forming platform leveling limiter (18) is matched with the forming platform coupler (19) through a shaft and is in fastening connection through the aid of a forming platform fastening screw (18); the forming platform coupling (19) is fixedly connected with the Z-axis screw rod sliding table (21) through screws, and the forming platform (17) can move in the Z-axis direction.
As shown in fig. 4, the Z-axis screw rod sliding table (21) has the same structure as the X-axis screw rod sliding table (5) and the Y-axis screw rod sliding table (12), and the stepping motor (5-1) is fixedly connected with the guide rail frame (5-6) through screws; the screw rod (5-4) forms shaft fit with the guide rail bracket (5-6) through two bearings (5-3). The screw rod (5-4) is tightly connected with the stepping motor (5-1) through a coupling (5-2). The guide rail (5-5) and the guide rail frame (5-6) form interference fit, and form clearance fit with the slide block (5-7); the sliding block (5-7) is in threaded fit with the screw rod (5-4), and the sliding block (5-7) can move along the axial direction of the screw rod sliding table.
As shown in fig. 1-3, two X-axis screw rod sliding tables (5) and a Y-axis screw rod sliding table (12) are respectively fastened and connected with an XY-axis coupler (22) through screws, so that the two X-axis screw rod sliding tables (5) are parallel to each other and are axially perpendicular to the Y-axis screw rod sliding table (12), and the Y-axis screw rod sliding table (12) can move along the axial direction of the X-axis screw rod sliding table (5); the X-axis screw rod sliding table (5) is fixedly connected with the forming bottom plate (6) through screws.
As shown in fig. 1, 5, 9 and 11, the trough clamp (3) is fixedly connected with a top plate (8-7) of the polishing machine through screws, and the trough (2) is in clearance fit with the trough clamp (3); the bottom of the trough (2) is provided with a hydrophobic high-transparency film with a Teflon coating, and the trough (2) can be taken out from the gap, so that the operation is convenient. The trough clamping screw (4) is tightly connected with the trough (2) through a thread through hole at two sides of the trough clamp (3).
As shown in figures 1 and 6, a printing head support (15) of the device is tightly matched with a Y-axis screw rod sliding table (12) through screws. The printing head (16) consists of a printing head rear cover (16-1), heat-conducting glue (16-2), a thermoelectric semiconductor refrigerating sheet (16-3), UV lamp beads (16-4), a throat pipe (16-5), a nozzle (16-6), a printing head front cover (16-7) and a feeding pipe head (16-8). The rear printing head cover (16-1) is tightly matched with the printing head support (15) through a screw, the outer side of the throat (16-5) is provided with a thread, the inner side through hole is provided with a Teflon coating, and the rear printing head cover (16-1) is tightly connected through an external thread; the thermoelectric semiconductor refrigerating sheet (16-3) is fixed on the rear cover (16-1) of the printing head through gluing; the through hole on the inner side of the feeding pipe head (16-8) is provided with a Teflon coating and is fixedly connected with the rear cover (16-1) of the printing head through threads, and the through hole on the inner side is aligned with the throat pipe (16-5); the front cover (16-7) of the printing head is fixedly connected with the rear cover of the printing head through screws, and the whole gap is filled with heat-conducting glue (16-2); the printing head (16) can move in the axial direction of the Y-axis screw rod sliding table (12), and the Y-axis screw rod sliding table (12) can move in the axial direction of the X-axis screw rod sliding table (5), so that the printing head (16) can move to any point in the stroke range of the two-axis screw rod sliding table on the XY plane, and materials are deposited into preset patterns in the plane.
As shown in figures 1, 7 and 8, the feeding and extruding device of the equipment comprises an extruding motor frame (13), an extruding slide groove frame (11-4) and a lower liquid storage groove clamp (10-1) which are respectively and fixedly connected with a forming bottom plate (6) through screws; the sliding rail (11-1) and the extrusion sliding groove frame (11-4) form interference fit, and form clearance fit with the sliding block (11-3); the half rack (11-2) is tightly connected with the sliding block (12-3) through a screw; the extrusion motor (14-1) is fixedly connected with the extrusion motor frame (13) through a screw, and the extrusion gear (14-2) is in interference fit with the extrusion motor (14-1) and is meshed with the half rack (11-2) to form gear teeth; the front end of the liquid storage tank (10-4) is provided with a threaded hole, the tank body is provided with a fixing groove corresponding to the shapes of the lower liquid storage tank clamp (10-1) and the upper liquid storage tank clamp (10-3), the upper liquid storage tank clamp (10-3) is fixedly connected with the lower liquid storage tank clamp (10-1) through a liquid storage tank tightening screw (10-2), the liquid storage tank (10-4) is fixed, and the liquid storage tank (10-4) can be quickly taken down by loosening the liquid storage tank tightening screw (10-2), so that the cleaning and the material replacement are convenient; a groove is formed in the extrusion piston (10-7), a sealing rubber ring (10-6) is arranged in the groove, and the interference sealing fit with the liquid storage tank (10-4) is realized through the action of the sealing rubber ring (10-6); the head of the piston push rod (10-5) is provided with external threads, the tail of the piston push rod is welded with a push plate, and the piston push rod is fixedly connected with the extrusion piston (10-7) through threads; the push rod sleeve (11-5) is provided with a groove which is adaptive to the shape of the push plate at the tail part of the piston push rod (10-5), the push rod sleeve is tightly connected with the slide block (11-3) through a screw, and the push plate at the tail part of the piston push rod (10-5) and the groove form clearance fit and can be taken out and put in quickly. The feeding pipe head (10-8) is internally provided with a through hole which is fixedly connected with a threaded hole at the front end of the liquid storage tank (10-4) through threads. The feeding pipe (23) is a hollow flexible Teflon hose and is connected with the feeding pipe head (10-8) and the feeding pipe head (16-8) in an interference fit manner.
The basic working mode of the feeding extrusion and printing spray head device is as follows: the extrusion motor (14) is controlled to rotate to drive the extrusion gear (14-2) to rotate, so that the half rack (11-2) meshed with the extrusion gear moves forwards to push the sliding block (11-3) tightly matched with the rack to move forwards, the sliding block (11-3) pushes the push rod sleeve (11-5) tightly matched with the sliding block to move forwards, the push rod sleeve (11-5) pushes the push plate at the tail part of the piston push rod (10-5), so that the piston push rod (10-5) pushes the extrusion piston (10-7) to move forwards, thereby leading the liquid material to obtain certain pressure, the ink is fed to a feeding pipe head (16-8) in a printing head (16) through a feeding pipe head (10-8) and a feeding pipe (23) at the front end of a liquid tank (10-4) and enters a throat pipe (16-5) from the feeding pipe head (16-8); the thermoelectric semiconductor refrigerating sheet (16-3) can adjust the temperature, and the temperature of the liquid material is adjusted through the heat-conducting glue (16-2) to ensure that the viscosity of the material is proper; the liquid continues upwards due to the pressure until it is applied to the forming surface by means of the nozzle (16-6); the liquid material is itself viscous to allow it to adhere to the molding surface, at which time the material is cured by irradiation with UV light (16-4).
An optical forming device of the equipment is shown in figures 1 and 9-11, a radiating aluminum sheet (9-1) is fixedly connected with a bottom plate (8) through screws, a UV lamp substrate (9-10) is fixedly connected with the radiating aluminum sheet (9-1) through screws, UV lamp beads (9-9) are welded on the UV lamp substrate (9-10), a light-gathering aluminum sheet (9-2) is formed by welding four light-gathering aluminum sheets, the upper end of the light-gathering aluminum sheet is folded, is provided with a through hole, and is fixedly connected with a Fresnel lens (9-3) through screws; the Fresnel lens (9-3) is formed by gluing a lens and a lens frame, the lens frame is provided with a threaded hole and is fixedly connected with the fly-eye lens (9-4) through a single-head copper column (9-6); the fly-eye lens group (9-4) is formed by gluing a lens and a lens frame, the lens frame is provided with a threaded hole and is fixedly connected with the gray control liquid crystal screen (9-5) through a single-head copper column (9-6); the gray control liquid crystal screen (9-5) is formed by gluing a backlight panel removed by 5.5 inches and a screen frame, wherein the frame is provided with a threaded hole and is fixedly connected with a light machine top plate (9-7) through a single-head copper column (9-6) and a screw. The shape control liquid crystal screen (9-8) is a liquid crystal screen with a removed backlight plate of 5.5 inches, and is glued on the top plate (9-7) of the optical machine; the polishing machine top plate (9-7) is fixedly connected with the forming bottom plate (6) through screws; the forming bottom plate (6) is in fastening connection with the bottom plate (8) through screws and pillars (7); the length of the support column (7) is controlled, so that the bottom surface of the light-gathering aluminum sheet (9-2) is in no forced contact with the top surface of the UV lamp substrate (9-10).
The basic working principle of the optical molding device is as follows: the UV lamp beads (9-9) are electrified to emit ultraviolet rays with a certain wavelength, and the ultraviolet rays are reflected by the light-gathering aluminum sheets (9-2) and irradiated to the surface of the Fresnel lens (9-3); the Fresnel lens (9-3) refracts the scattered light rays into parallel light rays, and the scattered light rays are further filtered out through the fly eye lens group (9-4); when the liquid crystal screen displays a pure black image, the liquid crystal screen is completely opaque, when the liquid crystal screen displays a pure white image, the liquid crystal screen is completely transparent, when the liquid crystal screen displays a gray image, the light intensity can be attenuated to a certain extent by penetrating through the liquid crystal screen, and the attenuation degree is determined by the gray level of the image; the gray control liquid crystal screen (9-5) can regulate and control the light rays emitted by the fly-eye lens group (9-4) by displaying a preset gray image with a shape, so that the light rays can generate adjustable and controllable light intensity attenuation according to the requirement; the shape control liquid crystal screen (9-8) displays a preset black and white pattern with a shape, the attenuated light is partially shielded by the shape control liquid crystal screen (9-8) to form light spots with the same shape, and the light spots are projected to a molding surface to partially cure the material.
Firstly, selecting a proper liquid material according to the performance of a designed part, pouring the selected liquid material suitable for optical forming into a liquid tank, and locking the liquid tank on a liquid tank chuck; liquid materials suitable for extrusion molding are filled into the liquid storage tank, the liquid storage tank is locked in the liquid storage tank clamp, and the tail push plate of the piston push rod is placed in the push rod sleeve.
Importing the designed parameters and the sliced three-dimensional model into a machine, selecting a model required by the machine, starting the machine by pressing, returning XYZ axes of the machine to a reference coordinate origin, and processing the machine by a processor according to the set model; when the extrusion type forming device works, the extrusion motor is controlled to rotate to drive the extrusion gear to rotate, so that the half rack meshed with the extrusion gear moves forwards, the sliding block tightly matched with the rack is pushed to move forwards, the sliding block pushes the push rod sleeve tightly matched with the sliding block to move forwards, the push rod sleeve pushes the tail push plate of the piston push rod, and the piston push rod pushes the extrusion piston to move forwards, so that liquid materials obtain certain pressure, are sent to a feeding pipe head in the printing head through a feeding pipe head and a feeding pipe at the front end of the liquid groove (10-4), and enter the throat pipe through the feeding pipe head; the thermoelectric semiconductor refrigerating sheet can regulate the temperature, and the temperature of the liquid material is regulated through the heat-conducting glue, so that the viscosity of the material is proper; the liquid continues to go upwards under the action of pressure until the liquid is coated on the molding surface through the nozzle; the liquid material can be adhered to the molding surface due to the viscosity of the liquid material, and the material is cured by the irradiation of the UV lamp beads; the printing head moves in an XY plane under the combined action of the X-axis screw rod sliding table and the Y-axis screw rod sliding table, so that the material is deposited into a preset pattern. And after one layer is processed, the printing platform is raised by one layer thickness according to the parameters, and the next layer is processed. When the optical forming device works, the UV lamp beads are electrified to emit ultraviolet rays with certain wavelength, and the ultraviolet rays are reflected by the light-gathering aluminum sheet and irradiate the surface of the Fresnel lens; the Fresnel lens refracts the scattered light into parallel light, and the scattered light is further filtered out through the fly-eye lens group; when the liquid crystal screen displays a pure black image, the liquid crystal screen is completely opaque, when the liquid crystal screen displays a pure white image, the liquid crystal screen is completely transparent, when the liquid crystal screen displays a gray image, the light intensity can be attenuated to a certain extent by penetrating through the liquid crystal screen, and the attenuation degree is determined by the gray level of the image; the gray control liquid crystal screen can regulate and control light rays emitted by the fly-eye lens group by displaying a preset gray image with a shape, so that the fly-eye lens group can generate adjustable and controllable light intensity attenuation according to needs; the shape control liquid crystal screen displays a preset black-and-white pattern with a shape, attenuated light passes through the shape control liquid crystal screen and is partially shielded, light spots with the same shape are formed, and the light spots are projected to a molding surface to enable the material to be partially cured. When the layer is processed, the printing platform automatically rises for a certain distance according to the parameters to realize release and then descends for a certain distance, and the rising distance is a preset difference value more than the descending distance, and the difference value is the layer thickness value of the next layer. And after the workbench descends, the next layer of processing can be carried out. The two working modes are intermittently and alternately executed according to the requirements of parts to be processed and mechanical properties and a preset program. When the last layer is processed, the machine stops working, the part is finished at the moment, the part is adhered to the forming platform, the part can be taken down by a worker at the moment, and when the next part is printed, the worker only needs to press a start key.
Note that: the origin of the machine's reference coordinates is the X, Y, Z axis coordinate, such that the forming table coincides with the bottom of the solution tank and the printhead is at the furthest position of the XY axis travel.

Claims (10)

1. The utility model provides a multimode many materials photocuring 3D printing apparatus which characterized in that: the Z-axis screw rod sliding table (21) is fixedly connected with a Z-axis connector (1) through screws, the Z-axis connector (1) is fixedly connected with a forming bottom plate (6) through screws, strip-shaped holes are formed in a forming platform leveling limiter (18), the screws penetrate through the strip-shaped holes to be connected with screw holes in a forming platform (17), when the screws are not locked, the forming platform (17) can adjust the relative parallelism with the bottom surface of a material groove (2), the screws are locked after the screws are adjusted properly, and the forming platform (17) is fixedly connected with the forming platform leveling limiter (18); the forming platform leveling limiter (18) is matched with the forming platform coupler (19) through a shaft and is in fastening connection through the aid of a forming platform fastening screw (18); the forming platform coupler (19) is fixedly connected with the Z-axis screw rod sliding table (21) through screws, and the forming platform (17) can move in the Z-axis direction; the forming bottom plate (6) is in fastening connection with the bottom plate (8) through screws and pillars (7); the liquid storage tank (10) is arranged on the extrusion chute (11), and the printing head (16) is communicated with the liquid storage tank (10); the extrusion motor (14) is arranged on the extrusion motor frame (13), and the printing head support (15) is in fastening fit with the Y-axis screw rod sliding table (12) through screws; the trough clamping screw (4) is in fastening connection with the trough (2) through threads and threaded through holes on two sides of the trough clamp (3);
the two X-axis lead screw sliding tables (5) and the Y-axis lead screw sliding table (12) are respectively and fixedly connected with the XY-axis coupler (22) through screws, so that the two X-axis lead screw sliding tables (5) are parallel to each other and are axially vertical to the Y-axis lead screw sliding table (12), and the Y-axis lead screw sliding table (12) can move along the axial direction of the X-axis lead screw sliding tables (5); the X-axis screw rod sliding table (5) is fixedly connected with the forming bottom plate (6) through screws.
2. The multimode multi-material photocuring 3D printing device of claim 1, wherein: the Z-axis screw rod sliding table (21), the X-axis screw rod sliding table (5) and the Y-axis screw rod sliding table (12) are screw rod sliding tables with the same structure, and in the screw rod sliding tables, a stepping motor (5-1) is fixedly connected with a guide rail frame (5-6) through screws; the screw rod (5-4) forms shaft fit with the guide rail bracket (5-6) through two bearings (5-3); the screw rod (5-4) is fixedly connected with the stepping motor (5-1) through a coupler (5-2); the guide rail (5-5) and the guide rail frame (5-6) form interference fit, and form clearance fit with the slide block (5-7); the sliding blocks (5-7) are in threaded fit with the screw rods (5-4), and the sliding blocks (5-7) can move along the axial direction of the screw rod sliding table.
3. The multimode multi-material photocuring 3D printing device of claim 1, wherein: the trough clamp (3) is fixedly connected with a light machine top plate (8-7) of a light machine (9) through screws, and the trough (2) and the trough clamp (3) form clearance fit.
4. The multimode multi-material photocuring 3D printing device of claim 1, wherein: the bottom of the trough (2) is provided with a hydrophobic high-transparency film with a Teflon coating, and the trough (2) can be taken out from the gap.
5. The multimode multi-material photocuring 3D printing device of claim 1, wherein: in the printing nozzle device, a printing head (16) consists of a printing head rear cover (16-1), heat-conducting glue (16-2), a thermoelectric semiconductor refrigerating sheet (16-3), UV lamp beads (16-4), a throat pipe (16-5), a nozzle (16-6), a printing head front cover (16-7) and a feeding pipe head (16-8); the rear printing head cover (16-1) is tightly matched with the printing head support (15) through a screw, the outer side of the throat (16-5) is provided with a thread, the inner side through hole is provided with a Teflon coating, and the rear printing head cover (16-1) is tightly connected through an external thread; the thermoelectric semiconductor refrigerating sheet (16-3) is fixed on the rear cover (16-1) of the printing head through gluing; the through hole on the inner side of the feeding pipe head (16-8) is provided with a Teflon coating and is fixedly connected with the rear cover (16-1) of the printing head through threads, and the through hole on the inner side is aligned with the throat pipe (16-5); the front cover (16-7) of the printing head is fixedly connected with the rear cover of the printing head through screws, and the whole gap is filled with heat-conducting glue (16-2); the printing head (16) can move in the axial direction of the Y-axis screw rod sliding table (12), and the Y-axis screw rod sliding table (12) can move in the axial direction of the X-axis screw rod sliding table (5), so that the printing head (16) can move to any point in the stroke range of the two-axis screw rod sliding table on the XY plane, and materials are deposited into preset patterns in the plane.
6. The multimode multi-material photocuring 3D printing device of claim 5, wherein: in the feeding and extruding device, an extruding motor frame (13), an extruding slide groove frame (11-4) and a lower liquid storage groove clamp (10-1) are respectively and fixedly connected with a forming bottom plate (6) through screws; the sliding rail (11-1) and the extrusion sliding groove frame (11-4) form interference fit, and form clearance fit with the sliding block (11-3); the half rack (11-2) is tightly connected with the sliding block (12-3) through a screw; the extrusion motor (14-1) is fixedly connected with the extrusion motor frame (13) through a screw, and the extrusion gear (14-2) is in interference fit with the extrusion motor (14-1) and is meshed with the half rack (11-2) to form gear teeth; the front end of the liquid storage tank (10-4) is provided with a threaded hole, the tank body is provided with a fixing groove corresponding to the shapes of the lower liquid storage tank clamp (10-1) and the upper liquid storage tank clamp (10-3), the upper liquid storage tank clamp (10-3) is fixedly connected with the lower liquid storage tank clamp (10-1) through a liquid storage tank tightening screw (10-2), the liquid storage tank (10-4) is fixed, and the liquid storage tank (10-4) can be quickly taken down by loosening the liquid storage tank tightening screw (10-2), so that the cleaning and the material replacement are convenient; a groove is formed in the extrusion piston (10-7), a sealing rubber ring (10-6) is arranged in the groove, and the interference sealing fit with the liquid storage tank (10-4) is realized through the action of the sealing rubber ring (10-6); the head of the piston push rod (10-5) is provided with external threads, the tail of the piston push rod is welded with a push plate, and the piston push rod is fixedly connected with the extrusion piston (10-7) through threads; the push rod sleeve (11-5) is provided with a groove which is adaptive to the shape of a push plate at the tail part of the piston push rod (10-5), the push rod sleeve is fixedly connected with the slide block (11-3) through a screw, and the push plate at the tail part of the piston push rod (10-5) and the groove form clearance fit and can be quickly taken out and put in; the interior of the feeding pipe head (10-8) is provided with a through hole which is fixedly connected with a threaded hole at the front end of the liquid storage tank (10-4) through threads; the feeding pipe (23) is a hollow flexible Teflon hose and is connected with the feeding pipe head (10-8) and the feeding pipe head (16-8) in an interference fit manner.
7. The multimode multi-material photocuring 3D printing device of claim 1, wherein: in the feeding extrusion and printing spray head device, an extrusion gear (14-2) is driven to rotate by controlling an extrusion motor (14) to rotate, so that the half rack (11-2) meshed with the semi rack moves forwards to push the sliding block (11-3) tightly matched with the rack to move forwards, the sliding block (11-3) pushes the push rod sleeve (11-5) tightly matched with the sliding block to move forwards, the push rod sleeve (11-5) pushes the push plate at the tail part of the piston push rod (10-5), so that the piston push rod (10-5) pushes the extrusion piston (10-7) to move forwards, thereby leading the liquid material to obtain certain pressure, the ink is fed to a feeding pipe head (16-8) in a printing head (16) through a feeding pipe head (10-8) and a feeding pipe (23) at the front end of a liquid tank (10-4) and enters a throat pipe (16-5) from the feeding pipe head (16-8); the thermoelectric semiconductor refrigerating sheet (16-3) can adjust the temperature, and the temperature of the liquid material is adjusted through the heat-conducting glue (16-2), so that the viscosity of the material is proper; the liquid continues upwards due to the pressure until it is applied to the forming surface by means of the nozzle (16-6); the liquid material is self-adhesive to adhere to the molding surface, and the material is cured by irradiation of UV lamp beads (16-4).
8. The multimode multi-material photocuring 3D printing device of claim 7, wherein: in the optical forming device, a radiating aluminum sheet (9-1) is fixedly connected with a bottom plate (8) through screws, a UV lamp substrate (9-10) is fixedly connected with the radiating aluminum sheet (9-1) through screws, UV lamp beads (9-9) are welded on the UV lamp substrate (9-10), a light-gathering aluminum sheet (9-2) is formed by welding four light-gathering aluminum sheets, the upper end of the light-gathering aluminum sheet is folded, a through hole is formed in the light-gathering aluminum sheet, and the light-gathering aluminum sheet is fixedly connected with a Fresnel lens (9-3) through screws; the Fresnel lens (9-3) is formed by gluing a lens and a lens frame, the lens frame is provided with a threaded hole and is fixedly connected with the fly-eye lens (9-4) through a single-head copper column (9-6); the fly-eye lens group (9-4) is formed by gluing a lens and a lens frame, the lens frame is provided with a threaded hole and is fixedly connected with the gray control liquid crystal screen (9-5) through a single-head copper column (9-6); the gray control liquid crystal screen (9-5) is formed by gluing a backlight panel removed by 5.5 inches and a screen frame, wherein the frame is provided with a threaded hole and is fixedly connected with a light machine top plate (9-7) through a single-head copper column (9-6) and a screw; the shape control liquid crystal screen (9-8) is a liquid crystal screen with a removed backlight plate of 5.5 inches, and is glued on the top plate (9-7) of the optical machine; the polishing machine top plate (9-7) is fixedly connected with the forming bottom plate (6) through screws; the length of the support column (7) is controlled, so that the bottom surface of the light-gathering aluminum sheet (9-2) is in no forced contact with the top surface of the UV lamp substrate (9-10).
9. The multimode multi-material photocuring 3D printing device of claim 8, wherein: the basic working principle of the optical molding device is as follows: the UV lamp beads (9-9) are electrified to emit ultraviolet rays, and the ultraviolet rays are reflected by the light-gathering aluminum sheets (9-2) and irradiated to the surface of the Fresnel lens (9-3); the Fresnel lens (9-3) refracts the scattered light into parallel light, and the fly eye lens group (9-4) filters the scattered light; the gray control liquid crystal screen (9-5) can regulate and control the light rays emitted by the fly-eye lens group (9-4) by displaying a preset gray image with a shape, so that the light intensity attenuation which can be regulated and controlled can be generated according to the requirement; the shape control liquid crystal screen (9-8) displays a preset black and white pattern with a shape, the attenuated light is partially shielded by the shape control liquid crystal screen (9-8) to form light spots with the same shape, and the light spots are projected to a molding surface to partially cure the material.
10. A multimode multi-material photocuring 3D printing method using the apparatus of claim 1, characterized in that: firstly, selecting a proper liquid material according to the performance of a designed part, pouring the selected liquid material suitable for optical forming into a liquid tank, and locking the liquid tank on a liquid tank chuck; filling a liquid material suitable for extrusion molding into a liquid storage tank, locking the liquid material in a liquid storage tank clamp, and placing a tail push plate of a piston push rod into a push rod sleeve;
importing the designed parameters and the sliced three-dimensional model into equipment, selecting a model required by the equipment, pressing down and starting, returning an XYZ axis of the equipment to a reference coordinate origin, and processing by a processor in the equipment according to the set model;
after one layer is processed, the printing platform is raised by one layer thickness according to the parameters, and the next layer is processed; when the optical forming device works, the UV lamp beads are electrified to emit ultraviolet rays with certain wavelength, and the ultraviolet rays are reflected by the light-gathering aluminum sheet and irradiate the surface of the Fresnel lens; the Fresnel lens refracts the scattered light into parallel light, and the scattered light is further filtered out through the fly-eye lens group; when the liquid crystal screen displays a pure black image, the liquid crystal screen is completely opaque, when the liquid crystal screen displays a pure white image, the liquid crystal screen is completely transparent, when the liquid crystal screen displays a gray image, the light intensity can be attenuated to a certain extent by penetrating through the liquid crystal screen, and the attenuation degree is determined by the gray level of the image; the gray control liquid crystal screen can regulate and control light rays emitted by the fly-eye lens group by displaying a preset gray image with a shape, so that the fly-eye lens group can generate adjustable and controllable light intensity attenuation according to needs; the shape control liquid crystal screen displays a preset black-and-white pattern with a shape, attenuated light passes through the shape control liquid crystal screen and is partially shaded, light spots with the same shape are formed, and the light spots are projected to a molding surface to partially cure the material; when one layer is processed, the printing platform automatically rises for a certain distance according to the parameters to realize release and then descends for a certain distance, and the rising distance is a preset difference value more than the descending distance, wherein the difference value is the layer thickness value of the next layer; after the worktable descends, the next layer of processing can be carried out; the two working modes are intermittently and alternately executed according to the requirements of parts to be processed and mechanical properties and a preset program; when the last layer is processed, the equipment stops working, the part is finished at the moment, the part is adhered to the forming platform, the part is taken down at the moment, and when the next part is printed, only a start key needs to be pressed;
the origin of the reference coordinate of the device is X, Y, Z axes, so that the forming platform is coincident with the bottom of the solution tank, and the printing head is positioned at the farthest position of the XY axis stroke.
CN202010259580.1A 2020-04-03 2020-04-03 Multimode multi-material photocuring 3D printing equipment Pending CN111531880A (en)

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Application publication date: 20200814