CN102602146B - Piezoelectric-type three-dimensional printing forming system and forming method thereof - Google Patents

Abstract

The invention discloses a piezoelectric three-dimensional printing forming system and a forming method thereof. The system includes a box body and its supporting frame, an X-direction movement mechanism (11), a load-bearing structure (21) connected to the X-direction movement mechanism, The powder storage chamber (13) and molding chamber (17) located under the carrying structure, the three-dimensional image layering discrete mechanism, and the powder spreading mechanism (20) and piezoelectric nozzle (10) loaded on the carrying structure (21) . The invention sprays solutions without heating through piezoelectric nozzles, can spray more kinds of solutions and is applied in emerging fields such as biology and pharmacy. The system mixes the bonding ingredients into the powder, which can add sufficient bonding ingredients and achieve satisfactory bonding strength. In addition, the invention has the advantages of compact structure, easy operation, low equipment cost and high molding precision.

Description

Piezoelectric three-dimensional printing forming system and forming method thereof

technical field

The present invention relates to the technical field of three-dimensional printing molding, and more specifically, to a piezoelectric jetting three-dimensional printing molding system and a molding method thereof.

Background technique

The 3D printing rapid prototyping technology was first developed by Emanuel Sachs of the Massachusetts Institute of Technology and others. It is currently one of the most vital technologies in the field of rapid prototyping and has broad application prospects. This technology is a growth-oriented manufacturing technology based on the idea of "discrete/stack". It uses computer technology to discretize the 3D CAD model into a series of 2D cross-sectional views in one direction, and then prints and accumulates them layer by layer according to the information of the cross-sectional views. In each layer of printing, the precision nozzle is used to spray the bonding solution on the pre-laid powder plane to bond the powder in the spray area, and then the printed powder plane is lowered to a certain height and a layer is laid on it Powder, ready for printing of the next cross-section. This cycle is repeated and stacked layer by layer until all cross-sectional drawings of the entire CAD model are printed. After post-processing, unbonded powder is removed to form a solid 3D model.

It can quickly and accurately manufacture the product according to the three-dimensional model data of the product, without resorting to various machining equipment and molds such as turning, milling, planing, grinding, and pliers required in the traditional part manufacturing process, with low cost and low consumption. short time. 3D printing rapid prototyping technology has advantages over other rapid prototyping methods in terms of molding accuracy, equipment price, environmental pollution, molding cycle and raw material diversity. Compared with photocuring rapid prototyping, layered solid manufacturing method and selective laser sintering rapid prototyping technology, 3D printing rapid prototyping technology has the advantages of low equipment price, high molding precision and less environmental pollution. Compared with fused deposition rapid prototyping technology, 3D printing rapid prototyping technology can form more types of materials, and the production time is relatively short. 3D printing rapid prototyping technology has been widely used in rapid prototype manufacturing, mold rapid manufacturing, functional parts manufacturing, medical models, pharmaceutical engineering, tissue engineering and other fields.

However, currently in the field of 3D printing rapid prototyping, hot bubble nozzles are generally used to spray molding materials or bonding materials, and generate microdroplets by heating to generate thermal bubbles. This method inevitably has an impact on the properties of the jetted material, especially the application of 3D printing rapid prototyping technology in emerging fields such as biology and pharmaceuticals. The 3D printing system generally adds the bonding components to the solution. Due to the limitation of the viscosity during injection, the content of the bonding components is often insufficient, and the bonding strength is not ideal. In addition, the existing rapid prototyping system has a complex structure, insufficient control precision, and the powder and binder required for molding are expensive, which limit further popularization and use.

Contents of the invention

In view of the above defects of the prior art, the object of the present invention is to provide a piezoelectric 3D printing molding system and its corresponding molding method, so that the solution can be sprayed without heating during molding, there are many types of sprayable solutions, and the equipment cost is low , High bonding strength and precision of molded parts.

According to one aspect of the present invention, a piezoelectric three-dimensional printing molding system is provided, which includes a box body and its supporting frame, an X-direction movement mechanism, a load-bearing structure, a powder chamber, a three-dimensional image layering and discrete mechanism, and a powder spreading mechanism and piezoelectric nozzles, of which:

The X-direction motion mechanism is installed on the support frame, including a stepper motor, two synchronous belts arranged along the X-axis direction and parallel to each other, and a Connected transmission shaft, the two ends of the transmission shaft are respectively equipped with synchronous pulleys, thus driving the parallel synchronous belts connected to it to perform movement in the X-axis direction;

Both sides of the carrying structure are respectively connected to the parallel timing belts for carrying the piezoelectric nozzle and the powder spreading mechanism;

The powder chamber is arranged in the box under the load-bearing structure, including a powder storage chamber and a molding chamber, which are respectively used to store powder materials constituting a three-dimensional image entity;

The three-dimensional image layered discretization mechanism is used to discretize the three-dimensional image that needs to be formed into a series of continuous two-dimensional sheet images according to a certain layer height;

The powder spreading mechanism is set on the bearing structure and moves with its X-direction movement, and pushes the powder materials of corresponding heights from the powder storage chamber sequentially according to the layer height set by the three-dimensional image layering discrete mechanism transfer to the forming cavity;

The piezoelectric nozzle is set on the supporting structure to move with its X-direction movement, and at the same time, it can reciprocate along the Y-axis direction perpendicular to the X-axis direction, and is used to be pushed to the molding by the powder spreading mechanism in turn. The powder material of the cavity is sprayed with a solution as a binder, respectively, thereby performing bond molding of the powder material.

Through the above technical concept of the present invention, since the piezoelectric nozzle is used as the injection mechanism of the binder solution, compared with the structure of the thermal bubble nozzle, there is no need to heat the solution when spraying, so that more types of solutions can be sprayed, and can Satisfactory bonding strength can be achieved by adjusting the bonding components in the solution; since the nozzle and the powder spreading mechanism are loaded on the carrying mechanism, on the one hand, the structural arrangement of the functional components can be made more compact, and the connection with the X-direction movement mechanism is convenient On the other hand, it can make up for the lack of rigidity of the support structure of the piezoelectric nozzle, so as to ensure the normal printing and ejection; in addition, due to the large size of the bearing structure in the Y direction, if it is driven by one side, it is prone to abnormal The response of the drive side is slower than that of the drive side, which affects the printing accuracy accordingly. The double-sided synchronous belt drive mode is adopted in the present invention, which can well solve the above problems.

As further preferably, the powder spreading mechanism includes a DC motor and a powder spreading roller connected to the DC motor through a coupling, and the two ends of the powder spreading roller have sheet powder baffles, thereby Driven by the motor, the powder material is transferred from the powder storage chamber to the molding chamber.

By setting the powder spreading mechanism as a roller-shaped structure equipped with a sheet powder baffle and connecting it with an independent DC motor, the accumulated powder can be properly raised by the rotation of the roller structure, reducing powder spreading At the same time, the powder spreading roller can level the powder plane that has been spread; in addition, when the powder spreading roller moves with the X-direction movement of the bearing structure, the sheet powder baffle can prevent the powder from Both ends are dropped to improve the precision of powder movement and avoid waste.

As a further preference, the piezoelectric nozzle is connected with a solution supply device, and the solution supply device is used for storing and replenishing the piezoelectric nozzle with a solution as a binder.

By adding a printing solution supply device to the piezoelectric nozzle, it is possible to ensure a sufficient amount of printing solution during the molding process, and at the same time, it is convenient to replace or add other types of printing solutions for different 3D image types, improving the convenience and efficiency of operation .

As a further preference, the powder chamber also includes a recovery chamber, which is arranged on one side of the molding chamber close to the molding chamber, and is composed of a box with an open upper surface and a drawer plate that can be opened and closed at the bottom. It is used to recover the excess powder material in the molding cavity.

By setting the recovery cavity of the box structure close to the molding cavity, powder materials can be recovered through simple operations. In addition, since the bottom of the recovery cavity has a drawer that can be opened and closed, it is convenient to take out the excess powder collected.

As a further preference, the three-dimensional printing system also includes a powder scraping device, which is installed at the recovery chamber, such as a sponge material, a flexible scraper, etc. The powder performs wiping and cleaning operations.

By setting the powder scraping device, the residual powder on the surface of the powder spreading roller can be effectively wiped and cleaned, and the forming accuracy of the two-dimensional images of each layer height can be correspondingly improved.

As a further preference, the support frame is welded by angle steel with holes or channel steel with holes, so that the support beam structure is conveniently installed on the frame, and the powder chamber, X-direction movement mechanism and other components are connected through the support beam structure. It is fixed, and the position of each component can be adjusted by adjusting the threaded connection position.

As a further preference, the bottom walls of the powder storage chamber and the molding chamber are respectively composed of a press plate with holes, and a negative pressure adsorption mechanism is respectively arranged on the lower part of the pressure plate with holes, and the negative pressure adsorption mechanism includes a bottom plate with a cavity , the cavity formed by the cover plate with holes and the first sealing ring that completes the sealing between the two, the vacuum device connected to the bottom plate with the concave cavity, the filter screen covered on the cover plate with holes, And the second sealing ring that completes the sealing between the filter screen, the cover plate with holes and the pressure plate with holes.

Through the negative pressure adsorption mechanism with the above structure, for each powder storage chamber or molding chamber used to store molding powder, the vacuum device pumps out air to form a negative pressure in the chamber, and passes through the holes of the cover plate with holes and the pressure plate with holes As well as the filter screen, the powder material in the powder storage cavity or the molding cavity can be absorbed and compacted under negative pressure, thereby increasing the density of the three-dimensional image entity and improving the printing accuracy.

As a further preference, the powder storage chamber and the molding chamber respectively include a powder chamber lifting mechanism, and the powder chamber lifting mechanism consists of a stepping motor, a worm gear reducer connected with the stepping motor, and a worm gear reducer connected with the worm gear reducer Connected screw nut pairs.

Through the above structure, the stepper motor drives the worm gear reducer, and then drives the bottom wall of the molding cavity and the bottom wall of the powder storage cavity to move up and down precisely through the screw nut pair. In addition, the worm reducer can ensure the self-locking in the vertical direction, and a certain deceleration multiple can realize a sufficiently small distance for each movement.

As a further preference, the 3D printing molding system also includes an automatic control device, which is used for layering and discretizing the 3D images during the operation of the entire 3D printing molding system, motion control in the 3D direction, and a vacuum pumping device. And temperature control, etc. are uniformly controlled, thereby realizing the unattended work of the entire 3D printing process.

According to another aspect of the present invention, a corresponding three-dimensional printing method is also provided, the method comprising:

Discretize the 3D image that needs to be formed into a series of continuous 2D sheet images with a certain layer thickness through the 3D image layered discrete mechanism;

Driven by the X-direction movement mechanism, the powder spreading mechanism sequentially pushes and transfers powder materials of corresponding heights from the powder storage chamber to the molding chamber according to the layer height set by the three-dimensional image layering discrete mechanism;

The X-direction movement mechanism brings the nozzle into the printing area above the forming cavity, and drives the piezoelectric nozzle to move along the X direction according to the two-dimensional sheet image information, and the piezoelectric nozzle itself moves along the Y direction perpendicular to the X-axis direction And selectively spray the solution as a binder, so that the powder material is bonded and formed according to the two-dimensional sheet image information;

The X-direction movement mechanism and the bearing structure return to the initial position to prepare for the printing of the next two-dimensional sheet image, and then repeat the above steps until all the two-dimensional sheet images are printed.

Generally speaking, compared with the prior art, the present invention has the following beneficial effects: In this system, droplets are generated by piezoelectric nozzle spraying, and there is no need to heat the solution during spraying, and more types of solutions can be sprayed, and the three-dimensional printing forming technology is applied to Emerging fields such as biology and pharmaceuticals; and can achieve satisfactory bonding strength by adjusting the bonding components in the solution. Loading the nozzle and the powder spreading mechanism on the carrying mechanism can make the structural arrangement of the functional components more compact and facilitate the connection with the X-direction movement mechanism; in addition, the X-direction movement adopts a double-sided drive mode, which has higher movement accuracy and better molding quality. good.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the three-dimensional printing molding system according to the present invention;

Fig. 2 is a three-dimensional schematic diagram of a three-dimensional printing molding system according to the present invention;

Fig. 3 is a structural schematic diagram of the powder spreading mechanism in the three-dimensional printing molding system according to the present invention;

Fig. 4 is a schematic diagram of the X-direction movement mechanism and the bearing structure in the 3D printing molding system according to the present invention;

Fig. 5 is a structural schematic diagram of the powder chamber lifting mechanism in the three-dimensional printing molding system according to the present invention;

Fig. 6 is a schematic structural view of the negative pressure adsorption mechanism in the three-dimensional printing molding system according to the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Please refer to Fig. 1 to Fig. 2 at the same time, the three-dimensional printing molding system of the present invention includes a piezoelectric nozzle 10, a powder chamber 22, a powder spreading mechanism 20, a bearing structure 21, an X-direction movement mechanism 11, a negative pressure adsorption mechanism 12, and a powder chamber Components such as the lifting mechanism 14, the powder scraping device 19, the box body and its supporting frame 23, and the automatic control device (not shown).

The piezoelectric nozzle 10 is transformed from a piezoelectric inkjet printer, retaining the piezoelectric nozzle of the inkjet printer, the nozzle movement mechanism (ie, the Y-direction movement mechanism) and its driving device, and adding a printing solution supply device 9, Ensure that there is a sufficient amount of printing solution during the molding process. The Y-direction movement mechanism uses a stepping motor to drive the synchronous belt, a cylindrical guide rail guide, and a grating detection method to drive the piezoelectric nozzle to move along the Y direction. The piezoelectric nozzle 10 is based on the design of the piezoelectric inkjet printer, which reduces the cost of the three-dimensional printing equipment; the piezoelectric nozzle is used to generate microdroplets, and there is no need to heat the solution when spraying, and more types of solutions can be sprayed; in addition, By mixing the bonding ingredients in the powder, the water-based solution in the printing solution supply device 9 is sprayed onto the surface of the powder to bond and shape the powder in the printing area, and sufficient bonding ingredients can be added to the powder to achieve satisfactory bonding strength .

The powder chamber 22 includes a powder storage chamber 13 and a molding chamber 17 . Both the powder storage chamber 13 and the molding chamber 17 are composed of two cuboid side walls without upper and lower surfaces and a perforated pressing plate 46 (shown in FIG. 6 ) as the bottom wall, forming a container that can hold powder materials. In order to facilitate recovery of redundant powder materials, a recovery cavity 16 may also be included. The recovery cavity 16 is composed of a box with an open upper surface, which is close to the forming cavity 17 to recover the excess powder material in the forming cavity. There is an openable and closable pumping plate at the bottom, which is convenient for taking out the collected excess powder.

The supporting structure 21 is a box structure, which is used to carry the powder spreading mechanism 20 and the piezoelectric nozzle 10, so that they are compactly arranged together, so as to be conveniently connected with the X-direction moving mechanism 11 and move along the X-direction under its drive. The translational movement of the powder spreading mechanism 20 can be completed, and the X-Y direction scanning action of the piezoelectric nozzle can also be completed in coordination with the Y direction movement. The carrying structure 21 also makes up for the lack of rigidity of the modified inkjet printer to ensure normal printing and jetting.

Powder scraping device 19 is made of such as flexible material such as sponge that is installed on recovery cavity 16, when powder spreading roller 29 (shown in Figure 3) moves to this position, rotates and produces friction with it, the powder that adheres to the surface Wipe away to keep the finish clean.

The support frame 23 is welded by perforated angle steel or channel steel with holes, and the support beam 24 can be easily installed on the frame, and the modules such as the powder chamber lifting mechanism 14, the powder chamber 22 and the X-direction movement mechanism 11 can pass through the support beam 24 is fixed, and the position of each module can be adjusted by adjusting the threaded connection position.

Please refer to FIG. 3 , which shows an embodiment of the powder spreading mechanism 20 . As shown in FIG. 3 , the DC motor 25 with a reducer drives the powder spreading roller 29 to rotate through a shaft coupling 27 . Sheet-shaped powder baffles 28 are arranged at the two ends of the powder spreading roller 29 to prevent powder from falling from the two ends. A DC motor 25 with a speed reducer and a powder spreading roller 29 are respectively fixed on the carrying structure 21 through a motor support 26 and two roller supports 30 . During the powder spreading process of 3D printing, the powder material is pushed from the powder storage chamber 13 to the molding chamber 17 through the translational movement of the powder spreading roller 29; the accumulated powder is properly raised by the rotation of the powder spreading roller 29 , reduce the powder spreading resistance; at the same time, the powder spreading roller 29 can level the powder plane that has been spread.

Please refer to FIG. 4 , which shows an embodiment of the X-direction motion mechanism 11 . As shown in Figure 4, the stepper motor 31 is connected with a transmission shaft 36 across the circular guide rail 35 along the X direction through a shaft coupling, and a synchronous pulley 32 is respectively installed at both ends of the transmission shaft 36. Each of the two synchronous pulleys drives a toothed synchronous belt 34, and each synchronous belt is connected with the side of the load-bearing structure 21 through the connecting block 33 respectively. In this way, an X-direction movement mechanism synchronously driven from both sides of the carrying structure 21 is formed. It avoids the adverse effect on the molding accuracy caused by the non-drive side response slower than the drive side due to unilateral drive. The X-direction kinematic mechanism 11 driven on both sides is guided by circular guide rails 35 on both sides.

Please refer to FIG. 5 , which shows an embodiment of the powder chamber lifting mechanism 14 . As shown in Figure 5, stepper motor 37 is connected with the worm screw of worm gear reducer 44 by coupling 38, and the worm gear shaft of worm gear reducer 44 is rigidly connected with the nut of lead screw nut pair 42, so, the stepper motor 37 The rotation is transferred to the rotation of the nut. The worm gear reducer 44 is fixed on the support plate 39, and the worm gear shaft and the nut cannot move in the vertical direction, so the rotation of the nut drives the leading screw of the leading screw nut pair 42 to move in the vertical direction. The screw and the two cylindrical shafts 40 on both sides of the screw are rigidly connected through the upper connecting plate 45 and the lower connecting plate 41, and the linear bearing 43 matched with the cylindrical shaft 40 is fixed on the support plate 39, through the cylindrical shaft 40 and the linear bearing 43 The matching guide ensures that the screw moves in the vertical direction. The negative pressure adsorption mechanism 12 is fixed on the upper connecting plate 45 and moves in the vertical direction together with the screw mandrel. The support plate 39 is fixed on the support beam 24, and the support beam 24 is fixed on the support frame 23, and the position and height can be adjusted conveniently through screw connection.

Please refer to FIG. 6 , which shows an embodiment of the negative pressure adsorption mechanism 12 . Structure as shown in Figure 6, the bottom plate 50 with cavity, the first sealing ring 48 and the cover plate 51 with holes form a cavity, an interface 49 is connected to the vacuum pumping device on the bottom plate 50 with cavity, cover plate 51 is covered with a filter screen 52, and the second sealing ring 47 completes the sealing between the filter screen 52, the cover plate with holes 51 and the pressure plate with holes 46. The perforated pressing plate 46 is used to carry the powder material in the powder storage cavity 13 or the molding cavity 17, and the vacuum device draws out the air to form a negative pressure in the cavity, and passes through the holes of the perforated cover plate 51 and the perforated pressing plate 46 and the filter screen, The powder material in the powder storage chamber 13 or the molding chamber 17 is sucked and compacted under negative pressure to improve the density of the three-dimensional printing molded parts.

In addition, the three-dimensional printing molding system of the present invention also includes an automatic control device, which is based on a motion control card. The computer-side control unit integrates two-dimensional sheet image generation functions, process control, motion control, inkjet Multiple functions such as control, powder spreading motor control, vacuum device and temperature control realize unattended work control of the entire 3D printing process.

The corresponding molding method of the 3D printing molding system according to the present invention will be described below.

First, when the automatic control device starts to operate, the three-dimensional image of the workpiece is discretized into a series of continuous two-dimensional sheet images with a certain layer thickness. The lifting mechanism of the powder storage chamber drives the bottom wall of the powder storage chamber to rise to a certain height, and the X-direction movement mechanism drives the powder spreading roller to move from the powder storage chamber to the forming chamber. At the same time, the powder spreading roller rotates to add powder materials from the powder storage chamber to The molding cavity, and the powder plane in the molding cavity is compacted and leveled. The X-direction movement mechanism brings the piezoelectric nozzle into the printing area above the molding cavity, and the computer invokes the printing program of the original inkjet printer to control the Y-direction movement of the piezoelectric nozzle according to the information of the two-dimensional sheet image of each layer; at the same time Detect the movement in the Y direction, and keep the coordination between the X direction movement and the Y direction movement; at the same time, the printing program of the original inkjet printer controls the nozzle to selectively spray the solution as the binder according to the information of the section of each layer. In the area where the solution is sprayed, the powder materials are bonded together, and the powder that is not sprayed with the solution plays a supporting role in the molding. After a layer of two-dimensional sheet image printing is completed, the bottom wall of the forming cavity is driven down by a distance of one layer thickness driven by the lifting mechanism of the forming cavity. The piezoelectric nozzle and the powder roller return to the initial position, ready to print the next layer of two-dimensional sheet image. Then repeat the above process, and so on, until all the two-dimensional sheet images are printed, and the three-dimensional printing of the workpiece is completed. After the molded part undergoes initial curing in the powder cavity, it can be taken out after removing the unbonded powder. Relevant post-processing is carried out on the workpiece to further improve the strength.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.

Claims (8)

1. a piezoelectric three dimension printing shaping system, this system comprises that casing and support frame thereof, X-direction motion (11), bearing structure (21), powder chamber (22), 3-D view divide layer scattering mechanism, Pu Fen mechanism (20) and piezoelectric type shower nozzle (10), wherein:

Described X-direction motion (11) is arranged on support frame, comprise stepper motor (31), along X-direction setting and two Timing Belts (34) of being parallel to each other, and across between described parallel Timing Belt (34) and with the joining power transmission shaft of described stepper motor (31) (36), the two ends of wherein said power transmission shaft (36) are separately installed with a synchronous pulley (32), these two synchronous pulleys (32) drive a motion with execution X-direction in described two Timing Belts (34) separately, Timing Belt described in each (34) is connected by contiguous block (33) and a side of described bearing structure (21) respectively, form thus from bearing structure (21) both sides synchronously driven structure simultaneously,

Described bearing structure (21) is body structure, for described Pu Fen mechanism (20) and piezoelectric type shower nozzle (10) are carried to it jointly, make in this way the structural configuration of functional unit more compact and be convenient to and the connecting and motion of described X-direction motion, the support stiffness of piezoelectric type shower nozzle (10) is made up simultaneously;

Described powder chamber (22) is arranged in casing and is positioned under described bearing structure (21), comprise powder storing chamber (13) and forming cavity (17), be respectively used to deposit the dusty material that forms 3-D view entity, wherein the diapire of powder storing chamber (13) and forming cavity (17) consists of pressing plate with holes (46) respectively, bottom at each pressing plate with holes (46) is also provided with respectively negative-pressure adsorption mechanism (12), this negative-pressure adsorption mechanism comprises by the base plate with cavity (50), cover having holes (51) and complete between the two the common cavity forming of the first sealing ring (48) of sealing, the vacuum extractor being connected with the described base plate with cavity (50), cover the filter screen (52) on described cover having holes (51), and complete described filter screen (52), second sealing ring (47) of sealing between cover having holes (51) and pressing plate with holes (46), in addition, described powder storing chamber (13) and forming cavity (17) have respectively powder chamber elevating mechanism, this powder chamber elevating mechanism is by stepper motor (37), be connected with this stepper motor (37) and be fixed on the worm reducer (44) on support plate (39), and form with the joining feed screw nut pair of described worm reducer (44) (42), wherein two cylinder axis (40) of the screw mandrel of feed screw nut pair (42) and screw mandrel both sides are rigidly connected by upper junction plate (45) and lower connecting plate (41), the linear bearing (43) matching with described cylinder axis (40) is fixed on described support plate (39), in this way by the cooperation guiding between described cylinder axis (40) and linear bearing (43), the screw mandrel in the vertical direction that guarantees feed screw nut pair (42) moves, it is upper that described negative-pressure adsorption mechanism (12) is fixed on described upper junction plate (45), thus with in the vertical direction motion together with the screw mandrel of described feed screw nut pair (42),

Described 3-D view divides layer scattering mechanism for needing the 3-D view of moulding to be separated into a series of continuous two-dimensional sheet image according to certain floor height; Described Pu Fen mechanism (20) is arranged on described bearing structure (21) and above with its X-direction, moves, and divides the floor height that layer scattering mechanism sets successively the dusty material of corresponding height to be promoted to transfer to forming cavity (17) from described powder storing chamber (13) according to described 3-D view; Described piezoelectric type shower nozzle (10) is arranged on described bearing structure (21) and above with its X-direction, moves, can move back and forth along the Y direction perpendicular to X-direction simultaneously, for spraying respectively the solution as binding agent to the dusty material that is pushed into successively forming cavity (17) by described Pu Fen mechanism (20), carry out thus the molding bonded to dusty material.

2. piezoelectric three dimension printing shaping system as claimed in claim 1, it is characterized in that, described Pu Fen mechanism (20) comprises direct current generator (25) and by shaft coupling and the joining powder-laying roller cylinder of this direct current generator (25) (29), the two ends of described powder-laying roller cylinder (29) have sheet powder blocking plate (28), thus under the driving of direct current generator, translation by powder-laying roller cylinder (29) promotes to transfer to forming cavity (17) by dusty material from described powder storing chamber (13), and by the rotation of powder-laying roller cylinder (29), the dusty material of accumulation is kicked up to reduce to spread powder resistance, powder-laying roller cylinder (29) also carries out smooth for the powder plane to having spread simultaneously.

3. piezoelectric three dimension printing shaping system as claimed in claim 1 or 2, it is characterized in that, described piezoelectric type shower nozzle (10) is connected with solution supply device (9), and this solution supply device (9) is for storing and supplementing the solution as binding agent to piezoelectric type shower nozzle (10).

4. piezoelectric three dimension printing shaping system as claimed in claim 3, it is characterized in that, described powder chamber (22) also comprises recycling cavity (16), this recycling cavity (16) is close to described forming cavity (17) and is arranged on one side, by the casing of upper surface open form and its bottom have can folding pumping board, for being recycled into the unnecessary dusty material of die cavity (17).

5. piezoelectric three dimension printing shaping system as claimed in claim 4, it is characterized in that, described 3 D-printing system also comprises powder-scraping device (19), this powder-scraping device (19) is formed and is arranged on described recycling cavity (16) and locates by sponge material, for the lip-deep powder of powder-laying roller cylinder of position that moves is so far carried out and wiped and clean operation.

6. piezoelectric three dimension printing shaping system as claimed in claim 1, is characterized in that, described support frame is welded by angle steel with holes or channel-section steel with holes.

7. piezoelectric three dimension printing shaping system as claimed in claim 1, it is characterized in that, described 3 D-printing formation system also includes automatic control device, this automatic control device, for divide motion control, vacuum extractor and temperature on layer scattering, three-dimensional to control unified control to the 3-D view of whole 3 D-printing formation system operating process, is realized the unmanned formula work to whole 3 D-printing process thus.

8. the system of use as described in claim 1-7 any one carried out a method for 3 D-printing moulding, and the method comprises:

By 3-D view, divide layer scattering mechanism to need the 3-D view of moulding to be separated into a series of continuous two-dimensional sheet images with certain bed thickness;

Under the drive of X-direction motion (11), Pu Fen mechanism (20) divides the floor height that layer scattering mechanism sets successively the dusty material of corresponding height to be promoted to transfer to forming cavity (17) from described powder storing chamber (13) according to described 3-D view;

X-direction motion (11) is brought into piezoelectric type shower nozzle (10) print area of die cavity (17) top, and drive piezoelectric type shower nozzle (10) to move along X-direction according to two-dimensional sheet image information, described piezoelectric type shower nozzle (10) self being along moving perpendicular to the Y-direction of X-direction and optionally spraying the solution as binding agent, thus according to two-dimensional sheet image information by dusty material molding bonded;

X-direction motion (11) and bearing structure (21) return to initial position, prepare the printing of next two-dimensional sheet image, then repeat above step and so circulate, until all two-dimensional sheet images have all been printed.