CN113799385B - Large-area photo-curing 3D printer for resin matrix composite material - Google Patents
Large-area photo-curing 3D printer for resin matrix composite material Download PDFInfo
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- CN113799385B CN113799385B CN202110997311.XA CN202110997311A CN113799385B CN 113799385 B CN113799385 B CN 113799385B CN 202110997311 A CN202110997311 A CN 202110997311A CN 113799385 B CN113799385 B CN 113799385B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive 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
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/124—Processes 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
- B29C64/129—Processes 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 characterised by the energy source therefor, e.g. by global irradiation combined with a mask
- B29C64/135—Processes 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 characterised by the energy source therefor, e.g. by global irradiation combined with a mask the energy source being concentrated, e.g. scanning lasers or focused light sources
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive 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
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive 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
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/205—Means for applying layers
- B29C64/214—Doctor blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive 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
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/227—Driving means
- B29C64/232—Driving means for motion along the axis orthogonal to the plane of a layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive 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
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/227—Driving means
- B29C64/236—Driving means for motion in a direction within the plane of a layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive 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
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/255—Enclosures for the building material, e.g. powder containers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive 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
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/264—Arrangements for irradiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive 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
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/264—Arrangements for irradiation
- B29C64/286—Optical filters, e.g. masks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive 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
- B29C64/30—Auxiliary operations or equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive 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
- B29C64/30—Auxiliary operations or equipment
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/321—Feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive 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
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE 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
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE 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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE 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
- B33Y50/00—Data acquisition or data processing for additive manufacturing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
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- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
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Abstract
A large-area photo-curing 3D printer of a resin matrix composite material comprises a support frame, a Delta parallel mechanism, a resin tank, a material supplementing system and a projector system; the Delta parallel mechanism is fixed on the support frame through a servo motor, and controls the printing platform to move in X, Y, Z three directions, so that large-format 3D printing is realized; the resin groove is fixed on the supporting frame; the feeding system realizes the supplementation of the consumed resin and the strickling of the resin in the resin tank by controlling the movement of the scraping plate; the projector system fixes the DLP projector on the support frame through the projector seat, so that the DLP projector is positioned, and large-format printing is realized by adopting one projector, so that the cost is low; the leveling problem of the resin-grade composite material coating is solved through the scraper movement.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a large-area photo-curing 3D printer for a resin matrix composite material.
Background
The carbon fiber reinforced polymer composite material (CFRP) has the remarkable advantages of light weight, high strength, high rigidity, corrosion resistance, fatigue resistance and the like, but the problems of easy occurrence of material separation layer, burr defect, serious cutter abrasion, large residual stress and the like in the drilling and milling processing of the composite material. The current manufacturing technology is changed towards material-structure-function integrated design manufacturing, and the process essential characteristics of 3D printing layering manufacturing are beneficial to direct molding of the special functional parts of the composite material.
3D prints and has the outstanding advantages of high molding speed, high printing precision, and the like, and can be used for producing complex parts. At present, the method has been widely applied in the fields of food medicine, aerospace, construction machinery and the like. However, the printing size of the photo-curing 3D printer is limited by the projection size of the DLP projector, and it is difficult to print a product with a larger size, which limits the development of 3D printing technology to some extent. The Delta parallel robot has the characteristics of good motion stability, simple structure, high motion precision and the like. The Delta parallel mechanism is fused with the 3D printing technology, and the printing platform is controlled to move in the X, Y, Z direction, so that the problem that a large-size model is difficult to print due to the fact that the traditional 3D printing technology is limited by the projection area of a mask image is solved.
In addition, the mixing of the fibers in the fiber reinforced composite material increases the viscosity of the composite material, the fluidity is poor, and the problem of quick leveling of the coating of the fiber reinforced composite resin material needs to be solved.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the large-area photo-curing 3D printer made of the resin matrix composite material, and the modular structural design is applied, so that the product structure is clear, the hierarchy is clear, and after-sales repair and replacement are convenient; the Delta parallel mechanism is used for controlling the movement of the printing platform, so that the production of large-size products can be realized; the automatic replenishment of the consumed resin can be realized through a replenishment system; the problems of poor flowability and difficult leveling of the composite material are solved through the scraping plate.
In order to achieve the above purpose, the invention adopts the following technical scheme: a large-area photo-curing 3D printer of a resin matrix composite comprises a support frame, wherein a Delta parallel mechanism, a resin tank, a feeding system and a projector system are fixed on the support frame;
the support frame mainly comprises 3 platforms, wherein the upper top surface, the middle platform and the lower bottom surface are respectively arranged from top to bottom; the upper top surface is connected with the middle platform through 4 plates I with the same cross section and triangular, one end of each plate I connected with the upper top surface is fixed through bolts, and one end of each plate I connected with the middle platform is fixed through welding; the lower bottom surface is connected with the middle platform through 4 same boards II with triangular sections, and the two ends of the boards II are respectively connected with the lower bottom surface and the middle platform in a welding way.
The Delta parallel mechanism comprises 3 servo motors, 3 identical driving arms, 3 identical driven arms and a movable platform; the three servo motors are fixed on the upper top surface of the support frame through bolts to form a static platform in the Delta parallel mechanism; the 3 driving arms are respectively connected with the servo motor and the driven arms through rotating pairs; the three driven arms are composed of 2 driven arm short arms and 2 driven arm long arms, a parallelogram structure is formed by four spherical pairs, and the short sides of the parallelogram are respectively connected with the driving arm and the moving platform through rotating pairs.
The feeding system comprises a Z-direction feeding mechanism and a Y-direction conveying mechanism;
the Z-direction feeding mechanism comprises a storage unit, a lifting table, a ball screw pair I, a coupler I, a stepping motor and a motor seat; the ball screw pair I comprises a screw I and a nut I; the lifting table is fixed with a first nut in the first ball screw pair through a screw; the first screw rod in the first ball screw pair is connected with the stepping motor through the first coupling; the stepping motor is fixed on the lower bottom surface of the supporting frame through the motor seat;
the Y-direction conveying mechanism comprises a scraping plate II, 2 ball screw pairs II, 2 screw bases I, 2 screw bases II, 2 couplings II and 2 motors; the second ball screw pair comprises a second screw and a second nut; the screw rod seat I, the screw rod seat and the motor are all fixed on the middle platform of the support frame through screws, the two ends of the screw rod II are fixed on the screw rod seat I and the screw rod seat II, and the two ends of the scraping plate II are respectively fixed with the nuts II in the two ball screw pairs II.
The radius of the static platform, the radius of the movable platform, the arm length of the driving arm and the arm length of the driven arm in the Delta parallel mechanism are all fixed values.
And the feeding system controls resin in the second pair of resin grooves to be scraped.
The bottom of the resin tank is provided with a boss, a shading material is coated on the part outside the boss, and the curing process is only carried out at the boss.
The projector system comprises a DLP projector, the DLP projector is placed in a projector sleeve 22 and is connected with a fixing frame through a spring bolt, and the lower end of the fixing frame is fixed on the lower bottom surface of the supporting frame through a screw.
The fixing frame is provided with a plurality of groups of holes connected with the projector sleeve and used for adjusting the height of the DLP projector.
The projector sleeve and the fixing frame are fixed through the spring bolt, and the DLP projector can be finely adjusted, so that the center of the DLP projector and the center of the boss in the resin groove are positioned in the same vertical line.
The beneficial effects of the invention are as follows:
the invention provides a large-area photo-curing 3D printer for a resin matrix composite material. The beneficial effects are as follows:
1) Each module is relatively independent, so that after-sale repair and replacement of products are facilitated;
2) The radius of the static platform, the radius of the movable platform, the length of the driving arm and the length of the driven arm of the Delta parallel mechanism are all fixed values, so that the kinematic forward solution and the kinematic backward solution of the Delta parallel mechanism are conveniently solved;
3) The printer adopts a feeding system to automatically feed the consumed resin, so that the labor cost is reduced;
4) The material supplementing system adopts scraper transportation, so that the problems that the composite material is difficult to naturally fill due to high viscosity and difficult to level are avoided;
5) A plurality of groups of holes are arranged on the DLP projector fixing frame, so that the distance adjustment of the DLP projector can be realized;
6) By arranging the boss in the resin tank, only the projection on the boss is printed during printing, and the stripping force in the printing process can be reduced.
Drawings
FIG. 1 is a schematic diagram showing the overall structural composition of a large-area photo-curing 3D printer for resin-based composite materials according to the present invention.
Fig. 2 is a schematic front view illustrating the structural components of a large-area photo-curing 3D printer for resin-based composite materials according to the present invention.
FIG. 3 is a block diagram of the Delta parallel mechanism of the present invention.
Fig. 4 is a structural view of a resin tank according to the present invention.
In the figure: the device comprises a first upper top surface, a second plate, a first 3-middle platform, a second 4-plate, a first 5-lower bottom surface, a 6-supporting frame, a 7-projector system, an 8-Z-direction feeding mechanism, a 9-Y-direction conveying mechanism, a 10-feeding system, an 11-Delta parallel mechanism, a 21-fixing frame, a 22-projector sleeve, a 23-DLP projector, a 24-resin tank, a 25-screw seat, a second 26-screw, a second 27-nut, a second 28-scraper, a first 29-screw seat, a 210-coupling, a 211-motor, a 212-storage unit, a 213-lifting platform, a first 214-nut, a first 215-screw, a first 216-coupling, a 217-stepping motor, a 218-motor seat, a second 219-ball screw pair, a first 220-ball screw pair, a 31-servo motor, a 32-driving arm, a 33-driven arm short arm, a 34-driven arm long arm, a 35-printing platform fixing plate, a 36-printing platform, a 37-driven arm, a 38-moving platform and a 39-boss.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and detailed description.
The large-area photo-curing 3D printer for the resin matrix composite is characterized by comprising a support frame 6, wherein a Delta parallel mechanism 11, a resin tank 24, a feeding system 10 and a projector system 7 are fixed on the support frame;
the supporting frame 6 mainly comprises 3 platforms, namely an upper top surface 1, a middle platform 3 and a lower bottom surface 5 from top to bottom; the upper top surface 1 is connected with the middle platform 3 through 4 identical plates I2 with triangular cross sections, one end of each plate I2 connected with the upper top surface 1 is fixed through bolts, and one end of each plate I2 connected with the middle platform 3 is fixed through welding; the lower bottom surface 5 is connected with the middle platform 3 through 4 same boards II 4 with triangular cross sections, and two ends of the boards II 4 are respectively connected with the lower bottom surface 5 and the middle platform 3 in a welding way.
The Delta parallel mechanism 11 comprises 3 servo motors 31, 3 identical driving arms 32, 3 identical driven arms 37 and a movable platform 38; wherein, 3 servo motors are fixed on the upper top surface 1 of the support frame 6 through bolts to form a static platform in the Delta parallel mechanism 11; the 3 driving arms 32 are respectively connected with the servo motor 31 and the driven arm 37 through rotating pairs; the 3 driven arms 37 are composed of 2 driven arm short arms 33 and 2 driven arm long arms 34, a parallelogram structure is formed by four spherical pairs, and the short sides of the parallelogram are respectively connected with the driving arm 32 and the movable platform 38 through rotating pairs.
The feeding system 10 comprises a Z-direction feeding mechanism 8 and a Y-direction conveying mechanism 9;
the Z-direction feeding mechanism 8 comprises a storage unit 212, a lifting table 213, a ball screw pair 220, a coupling 216, a stepping motor 217 and a motor base 218; the ball screw pair one 220 comprises a screw one 215 and a nut one 214; the lifting platform 213 is fixed with a first nut 214 in the first ball screw pair 220 through a screw; the first screw 215 in the first ball screw pair 220 is connected with the stepping motor 217 through the first coupling 216; the stepping motor 217 is fixed to the lower bottom surface 5 of the support frame 6 through a motor mount 218; this allows for the positioning of the DLP projector 23. The method is characterized in that: the fixing frame 21 is provided with a plurality of groups of holes for connecting the spring bolts, and the purpose of the holes is to conveniently adjust the distance between the DLP projector 23 and the resin groove 24.
The Y-direction conveying mechanism 9 comprises a scraping plate II 28, 2 ball screw pairs 219, 2 screw bases I29, 2 screw bases II 25, 2 couplings II 210 and 2 motors 211; the ball screw pair II 219 comprises a screw II 26 and a nut II 27; the first screw seat 29, the second screw seat 25 and the motor 211 are all fixed on the middle platform 3 of the support frame 6 through screws, two ends of the second screw 26 are fixed on the first screw seat 29 and the second screw seat 25, and two ends of the second scraper 28 are respectively fixed with the second nuts 27 in the second ball screw pair 219.
Multiple projections can be solidified in the same X-Y section through the Delta parallel mechanism 11, and large-format 3D printing is achieved.
The radius of the static platform, the radius of the movable platform, the arm length of the driving arm 32 and the arm length of the driven arm 37 in the Delta parallel mechanism 11 are all fixed values, so that the kinematic forward solution and the kinematic reverse solution of the dynamic forward mechanism are conveniently obtained, and the motion track of the movable platform 38 is controlled.
The replenishment of the consumable resin is accomplished by the replenishment system 10 without the need for manual filling.
The feeding system 10 controls the second scraping plate 28 to scrape the resin in the resin tank 24, so that the problem that the natural filling and leveling are difficult due to the high viscosity of the composite material is solved.
The bottom of the resin tank 24 is provided with a boss 39, a part outside the boss 39 is coated with a shading material, and the curing process is only carried out at the boss 39, so that the problem of printing failure caused by excessive stripping force when the whole curing layer comprising a plurality of webs is stripped is avoided.
The projector system 7 comprises a DLP projector 23, the DLP projector 23 is placed in a projector sleeve 22 and is connected with a fixing frame 21 through a spring bolt, and the lower end of the fixing frame 21 is fixed on the lower bottom surface 5 of the supporting frame 6 through a screw, so that the DLP projector 23 is positioned.
The fixing frame 21 is provided with a plurality of groups of holes connected with the projector sleeve 22 for adjusting the height of the DLP projector 23.
The projector sleeve 22 and the fixing frame 21 are fixed through spring bolts, and the fine adjustment can be performed on the DLP projector 23, so that the center of the DLP projector 23 and the center of the boss 39 in the resin groove 24 are positioned in the same vertical line.
The Delta parallel mechanism 11 is fixed on the upper top surface 1, and the resin tank 24 is fixed on the middle platform 3; the Z-direction feeding mechanism 8 and the Y-direction transporting mechanism 9 are fixed to the lower bottom surface 5 and the intermediate stage 3, respectively, and the projector system 7 is fixed to the lower bottom surface 5, directly below the resin tank 24.
The printer backup pad is from top to bottom respectively and goes up top surface, middle platform and bottom surface, is equipped with the recess in the middle platform.
The movable platform comprises a printing platform fixing plate and a printing platform;
the movable platform 38 is formed by fixing the printing platform fixing plate 35 and the printing platform 36 through screws.
The resin tank 24 is fixed in the middle platform 3 of the support frame, the bottom of the resin tank is provided with a boss 39, and the printer only prints mask images projected on the boss 39, so as to reduce huge stripping force generated during large-format printing.
The working principle of the invention is as follows:
before printing, the DLP projector 23 is leveled, so that the center of the DLP projector 23 and the center of the boss 39 in the resin tank 24 are ensured to be in the same vertical line; and the three-dimensional model to be printed is subjected to slicing processing to generate a two-dimensional mask image, and the two-dimensional mask image is further cut into a plurality of unit images (four unit images are illustrated as an example in this example) having an area not larger than the area of the boss 39 in the resin tank 24. When printing is carried out, the DLP projector 23 is turned on to enable the unit image to be projected to the bottom of the boss 39, the servo motor 31 in the Delta parallel mechanism 11 is used for controlling the swing of the driving arm 32, the rotation of the driven arm 37 is further controlled, and the printing platform 36 is adjusted to a proper position; the servo motor 31 in the Delta parallel mechanism 11 controls the swing of the driving arm 32, further controls the rotation of the driven arm 37, and controls the printing platform 36 to descend to a distance of one printing layer thickness from the boss 39 in the resin tank 24, and starts the solidification of the first unit image. After the curing is finished, the servo motor 31 in the Delta parallel mechanism 11 controls the swing of the driving arm 32 and further controls the rotation of the driven arm 37, so that the printing platform 36 is controlled to move to the position of the second unit image, the curing of the second unit image is started, and the cycle is repeated until the four unit images of the layer are printed. The servo motor 31 in the Delta parallel mechanism 11 controls the swing of the driving arm 32, further controls the rotation of the driven arm 37, and controls the printing platform 36 to move up one printing layer thickness, and starts the printing of the second layer mask image. And repeating the cycle until the fifth layer mask image is completely printed, controlling the servo motor 31 in the Delta parallel mechanism 11 to control the swing of the driving arm 32, further controlling the rotation of the driven arm 37, and controlling the printing platform 36 to move upwards by a certain height. The feeding system 10 starts to operate, the stepping motor 217 in the Z-direction feeding mechanism 8 drives the first screw 215 in the first ball screw pair 220 to rotate through the coupler 216, and then drives the first nut 214 in the first ball screw pair 220 to move upwards, so that the lifting table 213 moves upwards, resin in the storage unit 212 is pushed into the groove of the middle platform 3 of the support frame 6, then the Y-direction conveying mechanism 9 starts to operate, the coupler 210 is driven to rotate through the motor 211, and the second screw 26 in the second ball screw pair 219 is driven to rotate, so that the second nut 27 in the second ball screw pair 219 moves rightwards, the scraping plate 28 fixed with the second nut 27 moves rightwards, and the resin overflowed from the Z-direction feeding mechanism 8 is conveyed into the resin groove 24, so that the supplement of consumed resin is realized. After the resin is replenished, the motor 211 is reversed to drive the second scraping plate 28 to return to the initial position, and the printing platform continues to run repeatedly until the whole model is printed.
The present invention has been described in detail with reference to the above embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (1)
1. The large-area photo-curing 3D printer of the resin matrix composite is characterized by comprising a support frame (6), wherein a Delta parallel mechanism (11), a resin tank (24), a feeding system (10) and a projector system (7) are fixed on the support frame;
the support frame (6) mainly comprises 3 platforms, wherein the upper top surface (1), the middle platform (3) and the lower bottom surface (5) are respectively arranged from top to bottom; the upper top surface 1 is connected with the middle platform (3) through 4 identical plates I (2) with triangular cross sections, one end of each plate I (2) connected with the upper top surface (1) is fixed through bolts, and one end of each plate I (2) connected with the middle platform (3) is fixed through welding; the lower bottom surface (5) is connected with the middle platform (3) through 4 plates II (4) with the same cross section as a triangle, and two ends of the plates II (4) are respectively connected with the lower bottom surface (5) and the middle platform (3) in a welding way;
the Delta parallel mechanism (11) comprises 3 identical servo motors (31), 3 driving arms (32) with equal length, 3 driven arms (37) with equal length and a movable platform (38); wherein, 3 servo motors are fixed on the upper top surface (1) of the supporting frame (6) through bolts to form a static platform in the Delta parallel mechanism (11); one end of the 3 driving arms (32) is connected with the servo motor (31), and the other end is connected with the driven arms; the three driven arms (37) are composed of 2 driven arm short arms (33) and 2 driven arm long arms (34), a parallelogram structure is formed by four spherical pairs, and the driven arm short arms (33) at the other end of the parallelogram are connected with the movable platform (38);
the feeding system (10) comprises a Z-direction feeding mechanism (8) and a Y-direction conveying mechanism (9);
the Z-direction feeding mechanism (8) comprises a storage unit (212), a lifting table (213), a ball screw pair I (220), a coupler I (216), a stepping motor (217) and a motor base (218); the ball screw pair I (220) comprises a screw I (215) and a nut I (214); the lifting platform (213) is fixed with a first nut (214) in a first ball screw pair (220) through a screw; a first screw (215) in the first ball screw pair (220) is connected with a stepping motor (217) through a first coupler (216); the stepping motor (217) is fixed on the lower bottom surface (5) of the supporting frame (6) through a motor seat (218);
the Y-direction conveying mechanism (9) comprises a scraping plate II (28), 2 ball screw pairs II (219), 2 screw bases I (29), 2 screw bases II (25), 2 couplings II (210) and 2 motors (211); the ball screw pair II (219) comprises a screw II (26) and a nut II (27); the screw rod seat I (29), the screw rod seat II (25) and the motor (211) are all fixed on the middle platform (3) of the supporting frame (6) through screws, two ends of the screw rod II (26) are fixed on the screw rod seat I (29) and the screw rod seat II (25), and two ends of the scraping plate II (28) are respectively fixed with the nuts II (27) in the two ball screw pair II (219);
the lifting platform pushes resin in the storage unit (212) into a groove of the middle platform (3) of the support frame (6), and the second scraper (28) conveys overflowed resin into the resin groove;
the movable platform (38) consists of two parts, namely a printing platform fixing plate (35) and a printing platform (36), which are fixed by screws, and the movable platform (38) is connected with the other end driven arm short arm (33) of the parallelogram structure;
a boss (39) is arranged at the bottom of the resin groove (24), shading materials are coated on the outer parts of the boss (39), and the curing process is only carried out at the boss (39).
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