CN112060271A

CN112060271A - Full-automatic high-precision 3D printing method for photocuring ceramic

Info

Publication number: CN112060271A
Application number: CN202010775786.XA
Authority: CN
Inventors: 黄石伟; 陈�光; 顾荣军
Original assignee: Jiangsu Qiandu Zhizao Hi Tech Co Ltd
Current assignee: Jiangsu Qiandu Zhizao Hi Tech Co Ltd
Priority date: 2020-08-05
Filing date: 2020-08-05
Publication date: 2020-12-11

Abstract

The invention provides a full-automatic high-precision photocuring ceramic 3D printing method, which comprises the following steps: s1: collecting a three-dimensional model of a piece to be printed, and slitting the three-dimensional model of the piece to be printed to obtain a plurality of two-dimensional planes; s2: feeding: s3: scraping: s4: curing the slurry; s5: descending the height; s6: looping through steps S2-S5 completes the printing. The three-dimensional model of the ceramic piece is cut into a plurality of two-dimensional figures by software in a computer, a digital projector screen flickers a single image of each layer on the whole platform, and the required ceramic component can be continuously printed layer by matching with ceramic slurry continuously supplied by a feeding device, the use of a scraper component and the lifting of a printing workbench. And (4) printing the ceramic component, and degreasing, aging and sintering to finally obtain a finished product. Compared with the prior art, the invention realizes rapid, continuous and full-automatic ceramic 3D printing.

Description

Full-automatic high-precision 3D printing method for photocuring ceramic

Technical Field

The invention belongs to the technical field of 3D printing, and particularly relates to a full-automatic high-precision photocuring ceramic 3D printing method.

Background

One of the 3D printing, i.e., rapid prototyping, is a technology for constructing an object by using an adhesive material such as powdered metal or plastic and the like in a layer-by-layer printing manner on the basis of a digital model file. With the development of 3D printing technology, especially, the three-dimensional photocuring ceramic 3D printer is popular as a device used for 3D printing, and in the aspect of printing materials, the research and development of high-performance ceramic materials are rapidly developed and made on the surface, and the 3D printing application fields, such as aviation, aerospace and medical treatment, are wider and wider.

Due to continuous aging of the existing ceramic raw materials, the existing ceramic 3D printer cannot better process ceramic slurry with high viscosity, the problems of difficult accurate control of slurry use and consumption are caused, so that the printing resolution is low, and a high-precision printed piece with fine characteristics cannot be manufactured. In addition, the traditional ceramic 3D printer cannot meet the requirements of rapidness and higher precision, and has a complex structure, unreasonable arrangement of parts and difficulty in operation, so that the existing ceramic 3D printer has low efficiency and low precision.

Disclosure of Invention

In order to solve the technical problem, the invention provides a full-automatic high-precision photocuring ceramic 3D printing method.

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

The invention adopts the following technical scheme:

in some optional embodiments, there is provided a full-automatic high-precision photocuring ceramic 3D printing method, including the steps of:

s1: collecting a three-dimensional model of a piece to be printed, and slitting the three-dimensional model of the piece to be printed to obtain a plurality of two-dimensional planes;

s2: feeding:

s3: scraping:

s4: curing the slurry;

s5: descending the height;

s6: looping through steps S2-S5 completes the printing.

In some optional embodiments, the S2 includes:

s201: a driving motor of the feeding system is electrified and started, a driving shaft of the driving motor drives a piston in the material cylinder to move through a ball screw transmission mechanism in the support, the piston in the material cylinder is driven to extrude the slurry, and the slurry is extruded to a bin in the square groove through an outlet of the material cylinder to complete feeding.

In some optional embodiments, the S3 includes:

s301: the motor is electrified to work to drive the scraper device to move along the slide rail, so that the scraper drives the slurry accumulated at the feeding outlet to pass through the 3D printing table board, and the slurry is filled in a specified gap reserved between the scraper and the printing table board;

s302: after the scraper drives the slurry to completely penetrate through the printing table surface, the firing pin impacts the top end of the shifting fork device to complete tool changing;

s303: the scraper returns with the excess material, and the excess material is filled in a specified gap reserved between the scraper and the printing table top;

s304: and repeating S301-S304 to finish scraping.

In some optional embodiments, the S4 includes:

s401: starting a laser scanning system;

s402: the laser scanning system blinks a single image per layer using a digital projector, curing the slurry.

In some optional embodiments, the S5 includes:

s501: the power motor is electrified to work to drive the sleeve to move downwards, thereby driving the printing table surface of the working table to move downwards

The invention has the following beneficial effects: the three-dimensional model of the ceramic piece is cut into a plurality of two-dimensional figures by software in a computer, a single image of each layer is flickered on the whole platform by a digital projector screen, and the required components can be continuously printed layer by matching with ceramic slurry continuously supplied by a feeding system, the use of a scraper component and the lifting of a printing workbench. And (4) printing the ceramic component, and degreasing, aging and sintering to finally obtain a finished product. Compared with the prior art, the invention realizes rapid, continuous and full-automatic ceramic 3D printing.

Drawings

FIG. 1 is a schematic view of the structure of a machine used in the method of the present invention;

FIG. 2 is a schematic illustration of the structure of the fuselage of a machine used in the method of the invention;

FIG. 3 is a schematic diagram of the laser scanning system of the machine used in the method of the present invention;

FIG. 4 is a schematic view of the feed system of the machine used in the process of the present invention;

FIG. 5 is a schematic diagram of the construction of the lifting device of the machine used in the method of the present invention;

FIG. 6 is a schematic illustration of the structure of the table of the machine used in the method of the invention in one embodiment thereof;

FIG. 7 is a schematic diagram of a power supply of a machine used in the method of the present invention to power a work table;

FIG. 8 is a schematic view of the magnetic base of FIG. 6;

FIG. 9 is a schematic illustration of the structure of the table of the machine used in the method of the invention in another embodiment;

FIG. 10 is a schematic view of the position of the magnetic pole piece of a machine used in the method of the present invention;

FIG. 11 is a schematic illustration of the position of the locating pin of the machine used in the method of the present invention;

FIG. 12 is a schematic view of a chute of a machine used in the method of the present invention;

fig. 13 is a schematic view of the position of the magnetic block and the first magnetic conductive plate of the machine used in the method of the present invention;

FIG. 14 is a schematic view of the structure of a magnetic pole piece of a machine used in the method of the present invention;

FIG. 15 is a schematic illustration of the position of the squeegee assembly of the machine used in the method of the invention;

FIG. 16 is a perspective view of a squeegee assembly of a machine for use in the method of the invention in one embodiment thereof;

FIG. 17 is a top view of a squeegee assembly of a machine for use in the method of the invention in one embodiment thereof;

FIG. 18 is a sectional view taken along line B-B of FIG. 17;

FIG. 19 is a schematic illustration of the construction of one embodiment of a squeegee assembly for a machine used in the method of the invention;

FIG. 20 is a sectional view taken along line A-A of FIG. 19;

FIG. 21 is a perspective view of a squeegee assembly of a machine for use in the method of the invention in another embodiment;

FIG. 22 is a top view of another embodiment of a squeegee assembly for a machine used in the method of the invention;

FIG. 23 is a sectional view taken along line A-A of FIG. 22;

FIG. 24 is a schematic illustration of the construction of another embodiment of a squeegee assembly for a machine used in the method of the invention;

FIG. 25 is a cross-sectional view of a squeegee assembly of a machine for use in the method of the invention;

FIG. 26 is a schematic view of the construction of a tool tip precision adjustment device of a machine for use with the method of the present invention;

FIG. 27 is a schematic diagram of the construction of a wedge adjustment block of the machine used in the method of the present invention;

fig. 28 is a flow chart of the full-automatic high-precision photocuring ceramic 3D printing method according to the present invention.

Detailed Description

The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others.

As shown in fig. 28, the present invention provides a full-automatic high-precision photocuring ceramic 3D printing method, which realizes rapid ceramic 3D printing in a rapid, continuous and full-automatic manner:

s2: feeding: the formula of the slurry can be selected from 30-40% of photosensitive resin according to the volume ratio; 45-65% of ceramic powder, 1-10% of dispersant and 1-10% of photoinitiator. The specific formula of the slurry can be selected to be 35% of photosensitive resin; 55% of ceramic powder, 6% of dispersant and 4% of photoinitiator.

S201: a driving motor of the feeding system is started in a power-on mode, a driving shaft of the driving motor drives a piston in the charging barrel to move through a ball screw transmission mechanism in the support, the piston in the charging barrel is driven to extrude slurry, and the slurry is extruded to a storage bin in the square groove through an outlet of the charging barrel to complete feeding.

S3: scraping:

s304: and repeating S301-S304 to finish scraping.

S4: curing the slurry;

s401: starting a laser scanning system;

S5: descending the height;

s501: the power motor is electrified to work, and the driving sleeve moves downwards, so that the printing table surface of the workbench is driven to move downwards.

S6: looping through steps S2-S5 completes the printing.

As shown in fig. 1, a machine used in a full-automatic high-precision photocuring ceramic 3D printing method includes: laser scanning system 100, feed system 200, squeegee assembly 300, table 400, and body 500.

And a main body 500 for carrying all the systems and mechanisms of the printer.

As shown in fig. 2, the body 500 includes: a main body 501 and a reference plate 502. The reference plate 502 is arranged on the top of the main body 501, the reference plate 502 is a bearing surface and a reference surface of the main components of the present invention, and the main body 501 is a three-dimensional stable structure formed by welding square pipes.

A square groove 505 is formed in the middle of the reference flat plate 502, and a printing table top of the workbench ascends and descends in the square groove 505 to form a printing core working area. A silo may be provided in the square groove 505 and the feeding system 200 feeds the silo to supply the ceramic slurry to the work table 400.

The body 500 further includes: a horizontal adjustment mechanism 507, a mounting plate 503 and a shock-proof foot cup 506. The vibration prevention cup 506 is provided at the bottom of the body main body 501. The horizontal adjusting mechanism 507 is disposed between the main body 501 and the reference plate 502 to adjust the levelness of the reference plate 502, and an existing horizontal adjusting mechanism is adopted, which is not described herein again. A mounting plate 503 is provided on the body 501 perpendicular to the body 501 for mounting a driving part of the table 400. The body 500 further includes: a transverse mounting plate 504, on which transverse mounting plate 504 a drive or control portion of the printer may be mounted.

The laser scanning system 100, located above the platen 400, is used to generate a laser beam that cures the ceramic slurry to cure the slurry on the printing table top of the platen 400.

As shown in fig. 3, the laser scanning system 100 includes: digital projector 101, mounting board 102, and mounting bracket 104. The digital projector 101 is disposed on a mounting plate 102, and the mounting plate 102 is fixed to a mounting bracket 104 by an adjusting screw 103. The number of the adjusting screws 103 is three, and the three adjusting screws are distributed at the bottom of the mounting plate 102 in a triangular shape to adjust the lens of the digital projector 101 to be perpendicular to the workbench 400.

The digital projector 101 flickers each layer of single image on the printing table top of the whole workbench 400 and is positioned right above the workbench 400, so that each layer of single image can be flickered on the whole printing table top, the ceramic slurry is rapidly cured, and the single image is irradiated to the workbench for curing the ceramic slurry through the scanning galvanometer. The digital projector adopts a DLP projector, the screen flickers single images of each layer on the whole platform, and as the projector is a digital screen, each layer consists of square pixels, the structure is more simplified, and the efficiency is higher.

The supply system 200 is provided on the main body 501 to supply the slurry to the work table 400.

As shown in fig. 4, the feed system 200 includes: drive motor 201, base 202, support 203, cartridge 204 and displacement sensor 205 located on the side of cartridge 204. Base 202 sets up on fuselage main part 501, and driving motor 201's drive shaft passes through the ball screw drive mechanism in support 203 and is connected with the piston in the feed cylinder 204, and driving motor 201 during operation drives the inside piston extrusion thick liquids of feed cylinder 204, extrudees the feed bin to the square trough 505 in with thick liquids through the export of feed cylinder, realizes the material loading. The ball screw transmission mechanism is one of the existing transmission mechanisms, the ball screw is a product which converts rotary motion into linear motion or converts linear motion into rotary motion, and the specific structure is not repeated herein. The charging barrel is designed by adopting the existing straight-barrel piston type.

Feeding system 200 adopts motor drive, has solved the accurate supply problem of the ceramic thick liquids of high viscosity, and overall structure is stable, and the material loading is rapid, accurate, and the feed cylinder is dismantled easily moreover, conveniently reloads. The displacement sensor 205 uploads the measured data to the control system, and the accurate feeding is realized through the control of the control system.

The worktable 400 is a liftable worktable, and is lifted through a liftable device to realize the Z-direction movement of a workpiece in the printing process.

As shown in fig. 5, the lifting device includes: power motor 404, motor base 405, bottom plate 406, sleeve 407 and support plate 410. The power motor 404 is installed on the bottom plate 406 through the motor base 405, the bottom plate 406 is arranged at the bottom of the installation flat plate 503, the driving shaft of the power motor 404 is connected with the sleeve 407 through the ball screw transmission mechanism, the supporting plate 410 is arranged at the top of the sleeve 407, and the printing table top 412 of the workbench is arranged on the supporting plate 410. The power motor 404 drives the sleeve 407 to move up and down through the ball screw transmission mechanism, so as to drive the printing table top 412 of the workbench to move up and down. The ball screw transmission mechanism is one of the existing transmission mechanisms, the ball screw is a product which converts rotary motion into linear motion or converts linear motion into rotary motion, and the specific structure is not repeated herein. The beneficial effect of the combination is that the workbench can be quickly positioned and fixed, and the workbench can be quickly assembled and disassembled. The lifting workbench is a workpiece placing platform and is a core working area of the whole machine. The lifting positioning precision and the repeated positioning precision directly influence the working precision of the whole machine, the printing platform can be quickly disassembled, and the precision is kept unchanged after installation and recovery.

Liftable device still includes: the sliding plate 403 is connected with the guide rail 401 through the sliding block 402, the sleeve 407 is connected with the sliding plate 403, the guide rail 401 is arranged on the mounting flat plate 503, support is provided for the up-and-down movement of the sleeve, and the structure is stable.

The invention utilizes the control system to control various actions and logic relations of the printer, and the control system can adopt a PLC.

As shown in fig. 6 to 8, in one embodiment, the work table 400 includes: a magnetic base 414 and a workpiece tray 415 on the top surface of the magnetic base 414, wherein the magnetic base 414 and the workpiece tray 415 form a printing table of the workbench 400. The magnetic base 414 is a mechanism for connecting the workpiece tray 415, and can switch on and off the magnetic force to control the mounting and dismounting of the workpiece tray 415. The two ends of the workpiece tray 415 are provided with dismounting grooves 422, which is convenient for dismounting and holding the workpiece tray.

The magnetic base 414 is provided with an electromagnet 416 on a side facing the work pallet 415, and the work pallet 415 is provided with an iron piece 417 on a side facing the magnetic base 414 and at a position corresponding to the electromagnet 416. A power supply 418 supplies power to the coil of electromagnet 416, and a switch 419 is provided in the power supply circuit of power supply 418 to control the on/off of electromagnet 416. When the electromagnet 416 is energized to generate a magnetic force, the workpiece tray 415 is attracted. When the electromagnet 416 is de-energized and the magnetic force is removed, the workpiece tray 415 may be removed.

The iron sheet is selected to be 2Cr13, and the workpiece tray 415 is made of stainless steel, so that the deformation is small, and the workpiece tray is wear-resistant and corrosion-resistant.

The work table 400 further includes: and a locating pin 420. Cylindrical pin grooves 421 for accommodating the positioning pins 420 are formed in the magnetic base 414 and the workpiece tray 415, so that the workpiece tray 415 is accurately positioned in the installation process, the workpiece tray 415 and the magnetic base 414 are accurately positioned, and the electromagnet 416 firmly sucks the workpiece tray 415 when being electrified to complete installation.

Therefore, the workbench of the embodiment is convenient to disassemble and easy to clean, the time for disassembling and cleaning the printing table top can be shortened during continuous printing, and the cleaning time is saved, so that the printing efficiency is improved, and one workpiece can be directly disassembled and replaced by another workpiece tray for printing after being printed; the structure is reliable, and the positioning is accurate; because the iron sheet embedded on the workpiece tray is adsorbed by the magnetic force, the workpiece tray can not be slightly deformed when being disassembled and assembled, so that the printing precision can be ensured, the stability and the accuracy are ensured, and the cost is lower; through the effect of electromagnetism, solved fixed firm problem, fix a position the problem fast when having solved the installation through the round pin location.

As shown in fig. 9 to 14, in another embodiment, the work table 400 includes: a magnetic base 414 and a workpiece tray 415 positioned on the top surface of the magnetic base 414; the magnetic base 414 and the workpiece tray 415 form a printing table of the table 400. The magnetic base 414 is a mechanism for connecting the workpiece tray 415, and can switch on and off the magnetic force to control the mounting and dismounting of the workpiece tray 415.

The magnetic base 414 includes: the magnetic pole piece comprises a first magnetic conductive piece 427, a magnetic pole piece 423 and a magnetic base plate 424, wherein a sliding groove 425 is formed in the bottom surface of the magnetic base plate 424, the magnetic pole piece 423 is located in the sliding groove 425 and can move in the sliding groove 425, and the workpiece tray 415 and the magnetic pole piece 423 are located on the upper surface and the lower surface of the magnetic base plate 424 respectively.

The slide groove 425 is provided with a working position and a rest position, and the magnetic pole piece 423 reciprocates in the slide groove 425, so that the switching between the working position and the rest position can be realized. The working position in the chute 425 is provided with a magnetic conductive block 426 penetrating through the bottom of the chute, that is, one end of the magnetic conductive block 426 can contact the magnetic pole shoe 423 in the chute, and the other end thereof penetrates through the magnetic base plate 424 to contact the workpiece tray 415, so that the position of the magnetic conductive block 426 is the working position. Two ends of the first magnetic conductive sheet 427 are located at a rest position in the sliding slot 425, that is, the positions of the two ends of the first magnetic conductive sheet 427 are referred to as the rest position, and the first magnetic conductive sheet 427 does not penetrate through the magnetic base plate 424, i.e., cannot contact with the workpiece tray 415.

When the magnetic pole piece 423 reaches the working position, the magnetic pole piece, the magnetic conduction block 426 and the workpiece tray 415 are closed, so that the suction force is generated to suck the workpiece tray 415, and then the scraping printing can be started. When the magnetic pole piece 423 reaches the rest position, the magnetic force disappears, and the magnetic pole piece cannot fix the workpiece tray 415, that is, the workpiece tray 415 is released, and then the workpiece tray 415 can be detached for cleaning.

Therefore, the workbench is convenient to disassemble and easy to clean under the action of the mechanical device and the magnet, the time for disassembling and cleaning the printing table top can be shortened during continuous printing, and the cleaning time is saved, so that the printing efficiency is improved, and one workpiece is printed and is directly disassembled to be replaced with another workpiece tray for printing; the structure is reliable, and the positioning is accurate; because the magnetic force is absorbed by the magnetic conductive sheet embedded on the workpiece tray, the workpiece tray is not slightly deformed by dismounting, so that the printing precision can be ensured, the printing is stable and accurate, and the cost is lower; through the effect of electromagnetism, solved fixed firm problem, fix a position the problem fast when having solved the installation through the round pin location.

Two sliding grooves 425 are formed in the bottom surface of the magnetic base plate 424, and one magnetic pole piece 423 is arranged in each sliding groove 425, so that two positions capable of sucking the workpiece tray 415 are provided, and the sucking is firmer and more stable.

Cylindrical permanent magnets 428 are arranged at two ends of the magnetic pole piece 423, the working position comprises two cylindrical magnetic conduction blocks 426, and the working position and the resting position are arranged in a crossed mode, so that the magnetic pole piece 423 can be switched between the working position and the resting position without moving too far, and the working stability of the whole component is improved.

The workpiece tray 415 is provided with a second magnetic conductive piece at a position corresponding to the chute 425 on a side facing the magnetic base plate, so that the magnetic pole pieces, the magnetic conductive blocks 426 and the workpiece tray 415 are closed, and the workpiece tray 415 is sucked by suction force.

The magnetic base 414 further includes: and a driving device for driving the magnetic pole piece 423 to move in the sliding groove 425. The drive device includes: a spindle 429, a spindle bushing 430, a spindle handle 431, and a gear 432; the shaft handle 431 is connected to a shaft 429, and the shaft 429 is provided with a gear 432 that engages with the gear teeth of the magnetic pole piece 423. When the rotating shaft handle 431 is rotated during disassembly, the rotating shaft 429 is driven to rotate, when the rotating shaft 429 rotates, the magnetic pole piece 423 is driven to move in the sliding groove 425 through the gear 432, and at the moment, the magnetic pole piece 423 is equivalent to a rack. When the rotating shaft handle 431 is swung left and right, the magnetic pole piece 423 can be switched between the working position and the resting position. Simple structure, easy operation, cost are lower, switching speed is fast, promotes tray and changes efficiency.

The workpiece tray 415 is made of stainless steel, and has small deformation, wear resistance and corrosion resistance.

The work table 400 further includes: and a locating pin 420. The magnetic base 414 and the workpiece tray 415 are both provided with a cylindrical pin slot 421 for accommodating the positioning pin 420, so that the workpiece tray 415 is accurately positioned in the installation process, and the workpiece tray 415 and the magnetic base 414 are accurately positioned.

And a squeegee assembly 300 positioned between the laser scanning system 100 and the table 400 for spreading the slurry as a uniform thin layer on the table 400. The 3D printing ceramic slurry is supplied by the supply system 200 and is accumulated at the supply outlet, the scraper drives the slurry to sweep the 3D printing table top, a specified gap is reserved between the scraper and the printing table top, and the gap is filled when the ceramic slurry passes through the printing table top, so that the effect of filling materials is achieved.

As shown in fig. 15, the squeegee device 300 includes: the horizontal moving sliding plate 303 and the scraper 304 arranged on the horizontal moving sliding plate 303, the horizontal moving sliding plate 303 drives the scraper 304 to reciprocate above the printing table top, so as to scrape off the slurry supplied by the feeding system 200. The horizontal movement sliding plate 303 scraper device is installed on the reference flat plate 502 through the sliding rail 302 to realize translation in a printing work area, the horizontal movement sliding plate 303 is connected with the motor 301 through a synchronous belt, and the motor 301 drives the scraper device 300 to move along the sliding rail 302.

In one embodiment, as shown in fig. 20, the squeegee assembly 300 further includes: a scraper holder 305. The blade holder 305 is connected to the horizontally movable slide 303 via a pivot 306, i.e. the blade holder 305 can swing on the horizontally movable slide 303. The horizontal moving slide plate 303 is connected with the slide rail 302 to realize translation, and the scraper frame 305 realizes rotation around the rotating shaft 306. Both sides of the scraper holder 305 are provided with scrapers 304, and the two scrapers 304 form a certain angle with each other.

Scrape the blade holder 305 left and right sides and all be equipped with scraper 304, when scraper device 300 toward scraping material on one side, one side scraper 304 work, the another side scraper 304 improves the certain height and is out of work, when the switching-over, scrape the swing of blade holder 305, another side scraper 304 falls, former work scraper 304 promotes, realizes the tool changing function, switches the scraper 304 of scraping the blade holder both sides promptly.

As shown in fig. 16 to 20, the squeegee apparatus 300 further includes: a height limiting seat 307 and a limiting guide rod 308. The horizontal moving slide plate 303 reciprocates left and right, namely the horizontal moving slide plate 303 reciprocates above the printing table of the printer, the limiting height seats 307 are arranged at the end points of two sides of the moving route, and the purpose of the limiting height seats 307 is that when the horizontal moving slide plate 303 reaches the position with the scraper frame 305, the limiting height seats 307 apply a thrust to the scraper frame 305, so that the scraper frame 305 swings.

The top of the height-limiting seat 307 is provided with an inclined wedge surface 309, two sides of the scraper holder 305 are also provided with a limiting guide rod 308, and the height of the limiting guide rod 308 is between the highest point and the lowest point of the inclined wedge surface 309. When scraping the blade holder 305 and driving scraper 304 and reach limit for height seat 307 position department, spacing guide bar 308 contacts with the oblique wedge face 309 at limit for height seat top, when scraping blade holder 305 and continuing to remove, because oblique wedge face 309 is the slope, oblique wedge face 309 pushes down spacing guide bar 308 gradually for scrape the blade holder 305 and swing on horizontal migration slide 303, thereby switch scrapes the blade 304 of blade holder both sides.

For stable and balanced switching scraper, the number of the height limiting seats 307 is four, correspondingly, the number of the limiting guide rods 308 is also four, and the four limiting guide rods 308 are distributed at four corners of the scraper frame 305.

As shown in fig. 20, the two sides of the scraper holder 305 are further provided with positioning electromagnets 310, the two sides of the horizontally moving sliding plate 303 are provided with iron blocks 311 at positions corresponding to the positioning electromagnets 310, and a limit screw 312 is mounted near the positioning electromagnets 310, and the limit screw 312 ensures the positioning accuracy of the swinging of the scraper holder 305. When the scraper holder 305 swings in place on the horizontal sliding plate 303, the positioning electromagnet on the front side is electrified to attract the corresponding iron block, and the positioning electromagnet on the other side is powered off, so as to fix the scraper holder 305 after swinging is completed.

When the scraper holder 305 swings in place, the positioning electromagnet 310 generates magnetism, the scraper holder 305 and the horizontal moving sliding plate 303 are mutually firmly attracted, the working cutter head switching action is completed, when the scraper device 300 moves to the other side pole for limitation, the original positioning electromagnet 310 is switched off, the scraper holder 305 rotates around the rotating shaft 306 under the matching of the limiting guide rod 308 and the height limiting seat 307, the positioning screw 312 is limited, and the positioning electromagnet 310 on the side is electrified to enable the scraper holder 305 and the horizontal moving sliding plate 303 to be mutually firmly attracted, so that the working cutter head switching is realized. The electromagnetic devices on the two sides act alternately, and the actions are repeated, so that full-automatic cutter replacement in the 3D printing process is realized. The fixing mode of the scraper frame 305 is more secure and stable through the electromagnet device, and is more reliable, and the misoperation probability is reduced.

After the scraper 304 takes the slurry to completely penetrate through the printing table surface, the pendulum is realized through the structural blade of the embodiment, the scraper on the other side falls down, the scraper on the original side is lifted, the scraper takes the residual material to return to repeat the front action, and the automatic feeding problem of the 3D printer is solved through the reciprocating action. The clearance between the scraper and the workbench in use in the two scrapers is 0.1-0.3 mm.

Scraper means 300 in this embodiment adopts the double knives structure, realize the automatic switch-over double knives when removing about, the automatic feeding problem of 3D printer has not only been solved, electromagnet device uses with the cooperation of limit for height seat moreover, when guaranteeing the scraper precision, still make the tool changing process rapider, the tool changing mode is stable, reliable, the scraper means that the 3D printer passes through this embodiment can realize nobody now, the automatic operation processing material loading, the artifical unstable problem of precision of paining can not appear, the work precision has been solved, efficiency and reliability problem.

In another embodiment, as shown in fig. 25, the squeegee assembly 300 further includes: a scraper holder 305. The blade holder 305 is connected to the horizontally movable slide 303 via a pivot 306, i.e. the blade holder 305 can swing on the horizontally movable slide 303. The horizontal movable slide plate 303 is connected with the slide rail 302 for realizing translation, and the scraper frame 305 realizes rotation around the rotating shaft 306. The scraper holder 305 is provided with scrapers 304 on both sides, the two scrapers 304 being at an angle to each other.

As shown in fig. 21 to 25, the squeegee apparatus 300 further includes: a fork arrangement 313 and a striker 314. The horizontal moving slide plate 303 reciprocates left and right, namely the horizontal moving slide plate 303 reciprocates above the printing table of the printer, and the two end points of the moving route are provided with strikers 314, and the purpose of the strikers 314 is that when the horizontal moving slide plate 303 reaches the position with the scraper frame 305, the strikers 314 apply a pushing force to the shifting fork device 313, so that the scraper frame 305 swings.

The fork device 313 is connected with the horizontal sliding plate 303 in an axial mode, namely when the fork device 313 swings under the action of the firing pin 314, the scraper frame 305 is driven to swing, the horizontal sliding plate 303 is taken as a rotation supporting point, and the horizontal sliding plate 303 is not influenced. When the scraper holder 305 brings the scrapers 304 to the position of the striker 314, the striker 314 strikes the top end of the fork device 313 to deflect the top end of the fork device 313 in the direction opposite to the moving direction of the horizontal moving sliding plate, so that the bottom end of the fork device 313 swings, the bottom end of the fork device 313 is connected with the scraper holder 305, and finally the bottom end of the fork device 313 pulls the scraper holder 305 to rotate, that is, the scraper holder 305 swings on the horizontal moving sliding plate 303, so that the scrapers 304 on both sides of the scraper holder 305 are switched.

The fork device 313 includes: a fork 315, a fork piston rod 316 and a fork roller 317. The shifting fork 315 is connected with the shaft of the horizontal moving sliding plate 303, a shifting fork piston rod 316 is arranged at the lower end of the shifting fork 315 and forms a telescopic structure with the shifting fork 315, the tail end of the shifting fork piston rod 316 is connected with a shifting fork roller 317, and the shifting fork roller 317 can rotate at the tail end of the shifting fork piston rod 316. The shift roller 317 is coupled to the shift piston rod 316 via a pin 318.

A strip-shaped groove 319 is formed in the scraper frame 305, and the shifting fork roller 317 is located in the strip-shaped groove 319 and can roll in the strip-shaped groove 319. When the scraper holder 305 drives the scraper 304 to reach the position of the striker 314, the striker 314 strikes the shift fork 315, so that the bottom end of the shift fork piston rod 316 swings to drive the shift fork roller 317 to roll in the strip-shaped groove 319, the rolling shift fork roller 317 applies thrust to the scraper holder 305, and the left-right deviation process of the shift fork roller 317 stirs the scraper holder 305 to rotate, that is, the scraper holder 305 swings on the horizontal moving sliding plate 303, so as to switch the scrapers 304 on both sides of the scraper holder 305.

The shift fork device still includes: one end of the compression spring 320 is connected with the shifting fork 315, the other end of the compression spring 320 is connected with the shifting fork piston rod 316, and the compression spring 320 is in a compression state forever. Due to the action of the spring force in the piston rod of the shifting fork, the shifting fork device can firmly push against the scraper holder 305 in the swinging process, so that the scraper holder 305 can firmly push against after swinging, and the positioning function is realized. The fixation of the blade holder 305 is made more secure, stable and at the same time more reliable by the compression spring 320.

The shift fork device still includes: a support shaft 321, a bearing 322 and a fixing block 323. The bearing 322 is arranged in the shifting fork 315 and fixedly connected with the shifting fork 315, the bearing 322 is sleeved on the supporting shaft 321, and two ends of the supporting shaft 321 are fixedly connected with the horizontal sliding plate 303 through the fixing block 323. Therefore, the scraper frame takes the horizontal moving sliding plate 303 as a rotating supporting point, but the horizontal moving sliding plate 303 cannot be influenced, and the scraper frame is simple and stable in structure.

The shifting fork gyro wheel 317 can roll in bar groove 319 on the shift fork device, and when the shift fork device upper end received external force, the rotary motion was realized around the pivot to the shift fork device, because the spring force effect in the shifting fork piston rod, the frame was scraped in shifting fork device firmly top, and this kind is scraped the frame and is realized just firmly pushing up after the swing, has realized locate function. When the scraper device moves to the other side, the actions are repeated, and the automatic tool changing function is realized. After the scraper 304 takes the slurry to completely penetrate through the printing table surface, the pendulum is realized through the structural blade of the embodiment, the scraper on the other side falls down, the scraper on the original side is lifted, the scraper takes the residual material to return to repeat the front action, and the automatic feeding problem of the 3D printer is solved through the reciprocating action. The clearance between the scraper and the workbench in use in the two scrapers is 0.1-0.3 mm.

The horizontal moving sliding plate 303 is provided with a positioning screw 324 for adjusting the angle of the scraper holder 305, which is used for adjusting the angle of the scraper holder 305 and plays a role of accurate limit, thereby ensuring the positioning accuracy and repeated positioning accuracy of each swing. The squeegee apparatus 300 further includes: a buffer 325 is provided on the horizontal moving slide 303 for buffering the impact when the holder is swung to position.

Mounting grooves are formed in the two sides of the scraper frame 305, blade mounting plates 326 are arranged in the mounting grooves, and the two scrapers 304 are respectively mounted on the two sides of the scraper frame 305 through the blade mounting plates 326.

Scraper means 300 in this embodiment adopts the double knives structure, realize the automatic switch-over double knives when removing about, the automatic feeding problem of 3D printer has not only been solved, and realized automatic switching-over through firing pin and the cooperation of shift fork device, guarantee the while of scraper precision, still make the tool changing process rapider, the tool changing mode is stable, reliable, the scraper means that the 3D printer passes through this embodiment can realize no humanization now, the automatic operation processing material loading, the artifical unstable problem of precision of paining can not appear, consequently, the work precision, efficiency and reliability problem have been solved.

As shown in fig. 26 to 27, the present invention also provides a tool bit accuracy adjustment device including: a tapered wedge adjustment block 327, a fine thread screw 328, and a nut 329 for use with the fine thread screw.

Inclined surfaces 330 are provided at both ends of the scraper holder 305, inclined wedge adjustment blocks 327 attached to the inclined surfaces 330 are provided at positions of the blade mounting plate 326 corresponding to the inclined surfaces 330, and the inclined wedge adjustment blocks 327 are mounted in recesses at both ends of the blade mounting plate 326 by means of fine-toothed screws 328. The blade mounting plates 326 are mounted in mounting slots on both sides of the flight holder 305 by set screws 331.

The fine-toothed screw 328 is screwed, the inclined wedge adjusting block 327 and the scraper holder 305 form a squeezing effect, an included angle α is formed between the inclined plane of the inclined wedge adjusting block 327 and the horizontal plane, the horizontal moving length L is provided when the fine-toothed screw 328 is screwed, the height direction moves L × tan α upwards or downwards, the smaller the angle α is, the smaller the value of L × tan α is, and thus the blade mounting plate 326 and the scraper 304 realize fine adjustment upwards or downwards. Both ends of the doctor 304 are adjusted in the same way, and after adjustment into position, the nut 329 is tightened and secured: the oblique wedge adjustment block 327 is finally locked to the scraper stand 305 by the set screw 331, and the adjustment is completed.

The cutter head precision adjusting device enables the gap between the cutter edge and the printing table top to be accurately adjusted, can realize quick micro-adjustment of the precision of the scraper, has a simple structure, is convenient to operate, and provides guarantee for the precision of a finished product of a 3D printer.

Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

Claims

1. A full-automatic high-precision photocuring ceramic 3D printing method is characterized by comprising the following steps:

s2: feeding:

s3: scraping:

s4: curing the slurry;

s5: descending the height;

s6: looping through steps S2-S5 completes the printing.

2. The fully-automatic high-precision 3D printing method for photocuring ceramics according to claim 1, wherein the S2 includes:

3. The fully-automatic high-precision 3D printing method for photocuring ceramics according to claim 2, wherein the S3 includes:

s304: and repeating S301-S304 to finish scraping.

4. The fully-automatic high-precision 3D printing method for photocuring ceramics according to claim 3, wherein the S4 includes:

s401: starting a laser scanning system;

5. The fully-automatic high-precision 3D printing method for photocuring ceramics according to claim 4, wherein the S5 includes: