CN117002008A - Stereoscopic forming equipment, stereoscopic forming method and storage medium - Google Patents

Abstract

The invention discloses a three-dimensional forming device, a three-dimensional forming method and a storage medium. The main technical scheme of the invention is as follows: a stereolithography apparatus, comprising: a chute assembly including a printing space for receiving a resin; the printing platform assembly comprises a forming platform, and at least part of the structure of the forming platform is positioned in the printing space; the curing mechanism forming platform is opposite and used for projecting curing light to the resin so as to enable the resin to form a curing layer; the painting mechanism comprises a spray head assembly, the spray head assembly is opposite to the forming platform and used for spraying paint to the curing layer, and the curing mechanism is also used for projecting curing light to the paint so as to enable the paint on the curing layer to be cured to form a coating. The invention is mainly used for printing models.

Description

Stereoscopic forming equipment, stereoscopic forming method and storage medium

Technical Field

The invention relates to the technical field of 3D printing, in particular to a three-dimensional forming device, a three-dimensional forming method and a storage medium.

Background

In a photocuring 3D printer, resin is contained in a trough, a light source is irradiated according to the cross-sectional shape of an object to be formed by utilizing the characteristic that the photosensitive resin in a fluid state is subjected to polymerization reaction under illumination, so that the resin in the fluid state is cured and formed, a printing platform moves upwards layer by layer, and then the printing platform is laminated layer by layer, so that three-dimensional printing is realized.

When color printing is needed, resin can be replaced or thermochromic pigment is added into the resin, and the color of the model is changed by changing the color of the resin, but the color can be changed in a segmented mode only in the printing direction of the model, the process is troublesome, and the coloring has no flexibility. In order to make the colors of the printing model flexible and various, in the prior art, after the whole printing of the model is finished, the printing model is additionally colored, for example, a model coloring device is disclosed in a patent with a patent number of CN218876311U, different sides of the model to be colored are corresponding to a spraying mechanism through a rotary driving assembly, and the coating is sprayed to the model to be colored through the spraying mechanism, so that the model to be colored is colored. The model printing process and the color coating process are two independent stages realized by two devices, so that the model is printed into a finished product with long period, a user is required to take down the model and then move the model to a color coating mechanism for color coating, and one-time printing and forming of the color model cannot be realized.

Disclosure of Invention

In view of the above, the present invention provides a stereoscopic molding apparatus, a stereoscopic molding method and a storage medium, which solve the problem that the existing color model printing cannot be printed and molded at one time.

In order to achieve the above purpose, the present invention mainly provides the following technical solutions:

in one aspect, the present invention provides a stereolithography apparatus comprising:

the material tank assembly comprises a printing space, and the printing space is used for accommodating resin;

the printing platform assembly comprises a forming platform, and at least part of the structure of the forming platform is positioned in the printing space;

the curing mechanism is opposite to the molding platform and is used for projecting curing light to the resin so as to form a curing layer on the resin;

the coating mechanism comprises a spray head assembly, the spray head assembly is opposite to the forming platform and used for spraying paint to the curing layer, and the curing mechanism is also used for projecting curing light to the paint so as to enable the paint on the curing layer to be cured to form a coating.

In another aspect, the present invention also provides a stereoscopic molding method, including:

controlling a curing mechanism to irradiate resin above the forming platform according to the outline of the first curing layer so that the resin forms the first curing layer according to the outline of the first curing layer;

Controlling the spray head assembly to spray paint to the first curing layer according to the painting information of the first curing layer;

the curing mechanism is controlled to project curing light toward the coating material to cure the coating material on the first cured layer to form a coating layer of the first cured layer.

In still another aspect, the present application also provides a stereoscopic molding apparatus, including:

a memory for storing a computer program;

a processor for implementing the steps of the stereolithography method according to any of the preceding claims when executing the computer program.

In yet another aspect, the present application provides a computer-readable storage medium having stored therein at least one executable instruction for causing a processor to perform the steps of the stereolithography method according to any of the preceding claims.

The three-dimensional forming equipment, the three-dimensional forming method and the storage medium provided by the application have the advantages that the paint is sprayed on the formed curing layer mainly through the setting of the painting mechanism, the color printing effect is presented through the superposition of the curing layer and the coating, the one-time printing forming of the color model is realized, and the additional painting of the model is not needed. In the prior art, in order to make the colors of a printing model flexible and various, in the prior art, the printing model is additionally colored after the printing is finished, and the model printing process and the coloring process are two independent stages realized by two devices, so that the model is printed into a finished product with long period, and a user is required to take down the model and then move to a coloring mechanism for coloring, so that the one-time printing and forming of the color model cannot be realized. Compared with the prior art, in the application, the forming platform is immersed into the resin in the printing space, the curing mechanism cures the resin above the photo-curing forming platform by projecting and curing the resin to form a layer of cured layer, the painting mechanism sprays paint to the formed cured layer, the optical machine repeatedly projects curing light to cure the paint on the cured layer, the process is repeated, each cured layer and the coating are alternately laminated to form a model, the coating can enable the model to present color, one-time forming of the color model is realized, the spraying paint has flexibility, and flexible conversion of the color of the model can be realized.

Drawings

Fig. 1 is a schematic perspective view of a stereoscopic forming apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a stereoscopic forming apparatus according to an embodiment of the present invention at a first view angle;

fig. 3 is a schematic structural diagram of a stereoscopic forming apparatus according to an embodiment of the present invention at a second view angle;

fig. 4 is a schematic structural diagram of a stereoscopic forming apparatus according to an embodiment of the present invention at a third view angle;

fig. 5 is a schematic structural diagram of another stereoscopic forming apparatus according to an embodiment of the present invention at a third view angle;

FIG. 6 is a flow chart of a three-dimensional molding method according to an embodiment of the present invention;

fig. 7 is a flowchart of another three-dimensional forming method according to an embodiment of the present invention.

Detailed Description

In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects of the stereoscopic shaping device according to the invention with reference to the attached drawings and the preferred embodiments.

As shown in fig. 1 to 4, an embodiment of the present invention provides a stereoscopic molding apparatus, including:

a chute assembly 100, the chute assembly 100 including a printing space for accommodating a resin;

A printing platform assembly 200, the printing platform assembly 200 comprising a molding platform 210, at least part of the structure of the molding platform 210 being located in the printing space;

a curing mechanism 300, the molding platform 210 of the curing mechanism 300 is opposite to the molding platform, and is used for projecting curing light to the resin so as to form a curing layer on the resin;

the painting mechanism 400. The painting mechanism 400 includes a spray head assembly 410, the spray head assembly 410 being opposite the forming table 210 for spraying the coating onto the cured layer, and the light engine being further configured to project curing light onto the coating to cure the coating on the cured layer to form a coating.

For convenience of description of embodiments, in the present application, the cured layer refers to a cured layer formed by curing a resin of the trough assembly 100, and a particular adjacent cured layer may be two adjacent cured layers formed by curing the above resin, and the above coating may be present between the two cured layers. For convenience of description, the first cured layer and the second cured layer are two adjacent cured layers, the first cured layer is a previous cured layer which is cured earlier, and the second cured layer is a subsequent cured layer which is cured later.

The trough assembly 100 includes an upwardly open print space, the forming platform 210 includes a platform body including a horizontal upper surface for connecting the mold, and a connecting rod having one end connected to the platform body and the other end located outside the print space for connecting an external fixture or a power mechanism, the platform body being opened from above the trough assembly 100 into the print space and immersed in the resin in the print space. For convenience of description in the following embodiments, the molding stage 210 refers to a stage body. The upper surface of the molding table 210 for connecting the mold is parallel to the resin level, or the upper surface of the molding table 210 may be inclined with respect to the resin level.

At the beginning of printing, the upper surface of the molding platform 210 is completely or partially immersed in the resin, and the upper surface of the molding platform 210 will be covered with the resin. The curing mechanism 300 is used to generate curing light to cure the resin. The curing mechanism 300 may be specifically a light machine, where a lens of the light machine is opposite to the molding platform 210, and is used for projecting curing light, the curing light is light with a specific contour, the curing light propagates vertically downwards in a beam shape, and projects a projection with the specific contour on a resin liquid surface, so that the resin covered on the upper surface of the molding platform 210 is cured according to the specific contour and adhered to the upper surface of the molding platform 210, and a layer of the mold, i.e. a cured layer, is formed. The curing mechanism 300 can adopt a DLP (Digital Light Procession) optical machine to ensure the curing precision. The upper surface of the solidified layer is a solid surface substantially in the same plane as the resin level (the upper surface of the solidified layer or the upper surface of the molding platform 210 is substantially parallel to the resin level due to the tension), and the spray head assembly 410 sprays the coating onto the upper surface of the solidified layer, which may be by spraying, so that the coating drops on the upper surface of the solidified layer. The spray head assembly 410 may spray the same color, may spray multiple colors, may spray the entire upper surface continuously, or may spray only a portion of the area on any one of the cured layers. After the spray head assembly 410 is sprayed, the light machine again generates the curing light, the beam profile is the same as the profile of the curing layer, and the projection of the beam is matched with the edge of the curing layer, i.e. the upper surface of the curing layer is completely covered and the edge of the upper surface is not exceeded. The curing light cures the coating sprayed on the upper surface of the cured layer, so that the coating adheres to the cured layer to form a coating. The build platform 210 may then be moved downwardly to build up a layer of pattern thickness of resin between the cured layer and the resin level, and printing of the next layer of pattern may continue with the coating being sandwiched between the two layers of patterns. The resin has certain transparency or the transparency is larger than a preset value, the color coating between the two layers of models can be reflected on the appearance of the models through the resin layer, and the thickness of any model is very thin, such as 0.1 millimeter, and the coating is densely distributed among the models of all layers, so that the whole model presents color.

The coating may be a UV light curable paint and the light engine is used to generate UV light. The light engine may cure the coating after the spray head assembly 410 is finished, or may continue to cure the finished coating during the spray head assembly 410. In some other embodiments, the optical machine may be a point light source or a line light source, and the optical machine may be moved to scan the whole curing area to form the curing layer and cure the coating.

According to the stereoscopic forming equipment, the stereoscopic forming method and the storage medium provided by the embodiment of the application, the paint is sprayed on the formed curing layer mainly through the setting of the painting mechanism, and the color printing effect is presented through superposition of the curing layer and the coating, so that one-time printing forming of the color model is realized, and the model is not required to be painted separately. In the prior art, in order to make the colors of a printing model flexible and various, in the prior art, the printing model is additionally colored after the printing is finished, and the model printing process and the coloring process are two independent stages realized by two devices, so that the model is printed into a finished product with long period, and a user is required to take down the model and then move to a coloring mechanism for coloring, so that the one-time printing and forming of the color model cannot be realized. Compared with the prior art, in the application, the forming platform is immersed into the resin in the printing space, the curing mechanism cures the resin above the photo-curing forming platform by projecting and curing the resin to form a layer of cured layer, the painting mechanism sprays paint to the formed cured layer, the optical machine repeatedly projects curing light to cure the paint on the cured layer, the process is repeated, each cured layer and the coating are alternately laminated to form a model, the coating can enable the model to present color, one-time forming of the color model is realized, the spraying paint has flexibility, and flexible conversion of the color of the model can be realized.

In one embodiment, the painting mechanism 400 further includes a movement assembly 420, and the spray head assembly 410 is coupled to the movement assembly 420. The movement assembly 420 is used to drive the spray head assembly 410 to move at least in a plane parallel to the resin level. The spray head assembly 410 is used to spray paint to a preset area of the cured layer in cooperation with the moving assembly 420, where the vertical projection of the preset area on the forming platform 210 at least partially overlaps with the vertical projection of the cured layer on the forming platform 210, or the preset area is on the top surface of the forming platform 210 where the cured layer is opposite to the top surface of the forming platform 210, and the cured layer extends to the peripheral area of the edge of the cured layer.

The spray head assembly 410 is configured to move relative to the cured layer in cooperation with the movement assembly 420 to achieve flexible spray coating of the printing coating on the cured layer, and to control the spray area. Such as spray head assembly 410 spraying the entire top surface of the cured layer, so that the color coverage is greater and the color saturation exhibited by the mold as a whole is better. Alternatively, only the peripheral region of the top surface of the cured layer near the rim, such as the region extending from the rim to the center by 1 to 2 millimeters, may be sprayed, resulting in reduced spray time and paint savings.

More specifically, the stereolithography apparatus further includes a support base 500, where the support base 500 includes a top plate 510 and a bottom frame 520 that are connected, a printing opening is provided on the top plate 510, the trough assembly 100 is connected to the edge of the printing opening, and at least a portion of the trough assembly 100 is located between the top plate 510 and the bottom frame 520. The moving assembly 420 includes an X-axis moving unit 421 and a Y-axis moving unit 422, the showerhead assembly 410 is connected to the X-axis moving unit 421, the X-axis moving unit 421 is connected to the Y-axis moving unit 422, the Y-axis moving unit 422 is connected to the top plate 510, the X-axis moving unit 421 is used for driving the showerhead assembly 410 to move in the X-axis direction, the Y-axis moving unit 422 is used for driving the X-axis moving unit 421 to drive the showerhead assembly 410 to move in the Y-axis direction, the X-axis direction is perpendicular to the Y-axis direction, and both the X-axis direction and the Y-axis direction are horizontal directions. The number of the Y-axis moving units 422 can be two, the Y-axis moving units 422 are respectively positioned at two sides of the printing opening, two ends of the X-axis moving unit 421 are respectively connected with the two Y-axis moving units 422, and the two Y-axis moving units 422 synchronously drive the X-axis moving units 421 to move, so that the X-axis moving units 421 are more stable and are not easy to shake. The X-axis moving unit 421 spans the spray head assembly 410 above the trough assembly 100, and the spray head assembly 410 can move freely in the horizontal plane above the trough assembly 100 by matching the X-axis moving unit 421 and the Y-axis moving unit 422, so that spraying is flexible. In other embodiments, the X-axis moving unit 421 and the Y-axis moving unit 422 may be relatively independent modules, and the movement of the showerhead assembly 410 in the X-axis direction and the Y-axis direction is achieved by the connection with the showerhead assembly 410. The driving manner of the X-axis moving unit 421 and the Y-axis moving unit 422 may be various, and the following example is a specific structure of the X-axis moving unit 421: the X-axis moving unit 421 includes an X-axis power member, an X-axis track, an X-axis belt and an X-axis synchronizing wheel, the nozzle assembly 410 includes rollers, the X-axis track is connected with the Y-axis moving unit 422 and extends in the X-axis direction, the rollers are connected to the X-axis track in a rolling manner, the X-axis power member and the X-axis synchronizing wheel are respectively connected to two ends of the X-axis track, the X-axis belt is wound on the X-axis power member and the X-axis synchronizing wheel, the nozzle assembly 410 is connected with the X-axis belt, and the X-axis power member drives the X-axis belt to move out of the transmission and then drives the nozzle assembly 410 to move along the X-axis track. The following illustrates a specific structure of the Y-axis moving unit 422: the Y-axis moving unit 422 includes a Y-axis power member, a Y-axis track, a Y-axis moving block, and a Y-axis screw, the Y-axis power member is connected with the top plate 510, the Y-axis track is connected with the top plate 510 and extends in the Y-axis direction, the Y-axis moving block is slidably connected with the Y-axis track, one end of the Y-axis screw is connected with the Y-axis power member, the Y-axis screw is threaded through the Y-axis moving block, and the X-axis moving unit 421 is connected with the Y-axis moving block. The Y-axis screw rod is used for rotating under the drive of the Y-axis power piece, and the Y-axis moving block is pushed by threads to drive the X-axis moving unit 421 to move.

In one embodiment, the coating comprises a plurality of different colors, including blue, red, yellow, white, black, for example. The spray head assembly 410 includes a spray head body 411, a cartridge 412, and a feeding member, the cartridge 412 for storing paint. The spray head main body 411 is connected with the moving assembly 420, the spray head main body 411 comprises at least one nozzle which can be opened and closed, and a feeding member is connected with the feed cylinder 412 and the spray head main body 411, more specifically, the feed cylinder 412, the nozzle and the feeding member can be multiple and correspond to each other one by one, and the feeding member is used for conveying paint with one color to the spray head main body 411 so that the nozzle sprays the corresponding paint to the solidified layer.

The nozzles can be arranged side by side, the opening and closing of the nozzles can be controlled by piezoelectricity, each nozzle can be independently controlled to spray, the nozzles are connected with independent inner cavities, the paint flows into the inner cavities, and the paint is extruded from the lower opening of the nozzle by external force. In the color filling process, the coating area conforming to the slice contour information and the color information is sprayed on the solidified layer by controlling the spraying state and the spraying position of the nozzles with different colors, and then solidified by an optical machine to form a coating. The feeding assembly 323 may specifically include an air pump and a duct, and the air pump is connected with the cartridge 412 and the nozzle body 411 through the duct, respectively.

In one embodiment, the printing platform assembly 200 further comprises a lifting assembly 220, wherein the molding platform 210 is connected to the lifting assembly 220, and the lifting assembly 220 is configured to drive the molding platform 210 to move at least in a direction perpendicular to the resin liquid surface.

After the coating of the one layer of cured layer is cured, the lifting assembly 220 drives the forming platform 210 to move downwards by the thickness of the one layer of model, the cured layer is immersed in the resin, the resin with the thickness of the one layer of model flows into the upper part of the cured layer, the next layer of curing can be continued, and alternate printing of the cured layer and the coating is repeated, so that the curing and forming of the complete model are realized. The lifting assembly 220 may be a combination of a screw and a motor, which is not described herein. The lifting assembly 220 may be fixed to the top plate 510, and the optical machine may be fixed to the lifting assembly 220 near the top end.

The molding platform 210 sinks to drive the cured layer to be immersed in the resin, so that the level of the resin is required to be flat and the thickness of a layer of the mold is required to be uniform with the upper surface of the cured layer, however, due to a certain tension of the resin, the resin cannot uniformly flow to the upper surface of the cured layer after the cured layer is moved downwards. In addition, after the cured layer is molded, the resin around the cured layer may flow into the top surface of the cured layer due to vibration or the like, resulting in flow of the paint sprayed onto the cured layer and inaccurate color position. To solve the above problems, in one embodiment, the chute assembly 100 includes a chute 110 and a doctor blade assembly 120, the chute 110 including a printing space, the doctor blade assembly 120 being located above the molding stage 210 for moving in a preset doctor blade direction parallel to the resin liquid surface to scrape off the excess resin. The doctor blade assembly 120 includes a power unit 121 and a doctor blade 122, the doctor blade 122 is connected to the power unit 121, the doctor blade 122 extends from a first side of the printing space to a second side of the printing space opposite to the first side, a bottom end of the doctor blade 122 is located at a predetermined doctor blade height and above the molding platform 210, and the doctor blade 122 is used for being driven by the power unit 121 to move in a predetermined doctor blade direction to scrape off excessive resin. In some embodiments, the predetermined doctor blade height is level with a predetermined liquid level.

The doctor blade 122 is disposed to move at a predetermined height so that a uniform layer of resin is formed on the upper surface of the molding stage 210 or the upper surface of the cured layer, or the surplus resin is scraped off before the coating material is sprayed. The preset doctor blade height may be a liquid level of the resin in a natural state.

More specifically, the power unit 121 includes a doctor power member, two doctor rails, a doctor belt and a doctor synchronizing wheel, where the two doctor rails are located on opposite sides of the periphery of the trough assembly 100, and are connected to the top plate 510, the doctor synchronizing wheel and the doctor power member are located on outer sides of two ends of one doctor rail, the doctor belt is wound around the doctor synchronizing wheel and the doctor power member, and two ends of the doctor 122 are slidably connected to the doctor rails and connected to the doctor belt. The doctor power member is used to drive the doctor belt drive, which in turn drives the doctor 122 in a preset doctor direction. The extending direction of the scraper 122 may be an X-axis direction, a Y-axis direction, or an inclined direction, that is, an included angle with both the X-axis direction and the Y-axis direction. The preset doctor direction may be an X-axis direction or a Y-axis direction, but the preset doctor direction should form a certain angle with the extending direction of the doctor 122, for example, the preset doctor direction may be perpendicular to the extending direction of the doctor 122, or may be an angle close to 90 degrees, for example, an angle of 89 degrees, 80 degrees, 70 degrees, or even a more oblique angle, for example, an angle of 45 degrees, 135 degrees, or the like, which is not limited herein, so long as the angle is an angle capable of smoothly scraping the resin surface. In some embodiments, the doctor blade 122 may be specifically designed to have a resin adsorption function, and the surplus resin may be effectively removed by the movement of the doctor blade 122 over the resin.

In one embodiment, the trough assembly 100 further includes a level adjustment assembly for positioning the level of resin in the print space at a predetermined level.

The specific implementation of the level adjustment member 130 may be various, and the following three specific structures are exemplified:

first, as shown in fig. 4, the liquid level adjusting member includes a liquid discharge hole 130 formed at a sidewall of the trough 110, wherein a vertical height of a lowermost end of the liquid discharge hole 130 is positioned at a preset liquid level, the liquid discharge hole 130 is used to discharge the resin higher than the preset liquid level, and in some embodiments, a radius of the liquid discharge hole 130 may be in a range of 1 mm to 10 mm to ensure that the resin is normally discharged. The liquid level adjusting member 130 further includes a feeding member 140 and a liquid collecting member 150, the feeding member 140 is communicated with the printing space, the feeding member 140 is used for filling resin into the printing space, the liquid collecting member 150 is communicated with the printing space through the liquid discharging hole 130, and the liquid collecting member 150 is used for collecting the resin flowing out from the liquid discharging hole 130.

Before and during printing, resin can be slowly filled into the printing space at regular time, and excessive resin flows into the liquid collecting member 150 through the liquid discharging hole 130, so that the resin liquid level is always kept at the preset liquid level. The sump 150 may include a sump below the drain hole 130 and a sump with a filter device, and the resin flowing out of the drain hole 130 will fall into the sump and flow into the sump, filtered and then back into the feed 140 for further resin supply. The drain holes 130 may be provided in a plurality and circumferentially disposed around the sidewall of the trough 110.

Second, as shown in fig. 5, the liquid level adjusting member includes a liquid level sensor, a feeding member 140 and a discharging member 160, the liquid level sensor is opposite to the printing space for detecting the height of the liquid level of the resin, the feeding member 140 is communicated with the printing space for filling the printing space with the resin, and the discharging member 160 is communicated with the printing space for discharging the resin in the printing space. The liquid level sensor may be an infrared sensor fixed on one side of the optical machine or a probe type liquid level sensor fixed on the trough 110, monitors the resin liquid level in real time, charges the resin when the resin liquid level is reduced below a preset liquid level, discharges the resin when the resin liquid level is increased above the preset liquid level, and dynamically adjusts the resin liquid level.

Thirdly, the trough assembly 100 comprises a trough 110 and a scraper assembly 120, the trough 110 comprises a trough body and a partition plate, the partition plate is connected with the trough body, the trough 110 comprises a printing space and an auxiliary space, the printing space and the auxiliary space are respectively located at two sides of the partition plate, the liquid level adjusting piece comprises a liquid draining hole 130 located on the partition plate, the bottommost end of the liquid draining hole 130 is located at a preset liquid level, the printing space and the auxiliary space are communicated through the liquid draining hole 130, and the scraper assembly 120 is used for moving to scrape redundant resin and pushing the redundant resin to the auxiliary space through the liquid draining hole 130.

The cell body is for having open-ended cavity structure, and the baffle is installed in the cavity of cell body, cuts apart the cavity into printing space and auxiliary space, prints space and auxiliary space and communicates through the via hole. The predetermined height, or bottom, of the scraper 122 is the same as the height of the bottom of the via. In the rapid movement process of the doctor blade 122, the excessive resin is pushed by the doctor blade 122 to rapidly move to the through hole and move to the auxiliary space through the through hole, and the excessive resin does not flow back to the forming platform 210 in a short time due to the fact that the whole process of the doctor blade 122 is in a rapid movement process, and on the basis, the curing mechanism can be used for curing the resin into a relatively flat curing layer through light transmission. Meanwhile, the resin liquid level in the printing space is ensured to be the preset scraper height where the bottom end of the scraper 122 is located, and the preset scraper height is consistent with the preset liquid level height, so that accurate control of the model height is ensured. It will be appreciated that to ensure that the scraper 122 can push the excess arrangement to the auxiliary space, the partition and the auxiliary space should be on one side in the direction of movement of the scraper 122.

On the other hand, as shown in fig. 6, the embodiment of the invention further provides a three-dimensional forming method, which includes:

S1-1, controlling the curing mechanism 300 to irradiate the resin above the molding platform 210 according to the outline of the first curing layer so that the resin forms the first curing layer according to the outline of the first curing layer.

Before controlling the curing mechanism 300 to irradiate the resin located above the molding stage 210 in accordance with the contour of the first cured layer, the molding stage 210 is adjusted to an initial position in which a layer of mold thickness is spaced between the upper surface thereof and the resin level. The curing mechanism 300 may be a light machine that generates a light beam that is consistent with the contour of the first curing layer and projects the light beam onto the resin, so that the resin is cured at one time, or the light machine may generate linear light or spot light to cure by scanning. The first cured layer may be a first layer or a bottom layer of the mold, the cured layer is adhered to the upper surface of the molding platform 210, the first cured layer may be any layer in the middle of the mold, the curing mechanism 300 irradiates the resin above the molding platform 210 according to the outline of the first cured layer, that is, the curing mechanism 300 irradiates the resin above the molded mold above the molding platform 210 according to the outline of the first cured layer, so that the resin is cured to form the cured layer adhered to the upper layer of the mold.

S1-2, controlling the spray head assembly 410 to spray paint to the first curing layer according to the painting information of the first curing layer.

The color information of the cured layer refers to the color of the paint corresponding to the cured layer and the spraying area corresponding to the paint of each color, and the spraying mode of the spray head assembly 410 may be point spraying, and spraying is performed by the relative movement of the spray head assembly 410 and the forming platform 210. Specifically, the forming platform 210 is fixed, and the nozzle assembly 410 is controlled to move relative to the forming platform 210, so that the nozzle assembly 410 sprays the paint to the first curing layer according to the painting information of the first curing layer; or the spray head assembly 410 is not moved, and the forming platform 210 is controlled to move relative to the spray head assembly 410, so that the spray head assembly 410 sprays paint to the first curing layer according to the painting information of the first curing layer; or the spray head assembly 410 and the molding stage 210 are controlled to move simultaneously, e.g., the spray head assembly 410 moves in the X-axis direction and the molding stage 210 moves in the Y-axis direction, so that the spray head assembly 410 sprays the paint to the first cured layer according to the paint information of the first cured layer.

In some embodiments, the color information includes a predetermined area and a paint color, the method further comprising: and controlling the spray head assembly to spray paint according to the preset area and the paint color. For example, the preset area may be a peripheral area to be sprayed, which is a preset proportion of the total area of the corresponding cured layer, in the corresponding cured layer, the preset proportion may correspond to a specific proportion value, such as 1% to 20%, 1%, 2%, 5%, 10%, and the like, of the total area of the cured layer, and the specific value may be set according to the actual situation, for example, when the preset proportion is 10%, that is, the specific area to be sprayed is 10% of the total area of the corresponding cured layer, and the specific area is generally an area near the edge of the corresponding cured layer, particularly forms some annular areas, and the like, and meanwhile, in combination with the paint colors required by each point in the preset area (when the composite color is required, various paint colors may also be correspondingly sprayed to generate rich and colorful colors), the preset area is sprayed, so that after the model is printed, the specific color can be reflected on the edge of the corresponding cured layer.

In some embodiments, the preset area may also be a peripheral area with a preset number of pixels, for example, in the corresponding fixed layer, where the spraying is performed according to the preset number of pixels, for example, the preset number of pixels may be 1 to 10 pixels (integer), and the specific area is usually an area near the edge of the corresponding cured layer, for example, when the preset number of pixels is 10 pixels, that is, when the edge of the corresponding cured layer is seen from the edge of the corresponding cured layer, the preset area near the edge of 10 pixels is sprayed with the coating.

In some embodiments, the preset area may also be a peripheral area with a preset distance, for example, in the corresponding fixed layer, where spraying is performed according to the preset distance, where the preset distance may be a specific value distance ranging from 1 mm to 10 mm, for example, 1 mm, 2 mm, 10 mm, and the specific area is usually an area near the edge of the corresponding cured layer, for example, when the preset distance is 10 mm, that is, when the edge of the corresponding cured layer is seen from the edge of the corresponding cured layer, the preset area near the edge of 10 mm will be sprayed with the paint.

In some embodiments, the peripheral region may be an annular region proximate to the edge of the corresponding solidified layer.

In some embodiments, the color information includes a paint color, the method further comprising: and controlling a spray head assembly to spray paint according to the outline of the first solidified layer and the paint color. In this embodiment, the coating layer may be formed by spraying the region within the outline of the corresponding cured layer, and then performing the photo-curing operation of the coating layer with reference to the range of the predetermined region when the curing light is projected subsequently.

For the first cured layer, the spraying areas corresponding to the coatings of the colors form preset areas of the first cured layer together, the spray head assembly 410 is controlled to spray the coating to the first cured layer, specifically to spray the coating to the preset areas of the first cured layer, and the preset areas are at least partially overlapped by the vertical projection of the first cured layer on the forming platform and the vertical projection of the first cured layer on the forming platform, so that the color coverage is more, and the color saturation of the whole appearance of the model is better. Alternatively, the preset area is a peripheral area extending to the edge of the first cured layer on the top surface of the first cured layer opposite to the forming platform 210, i.e. only a partial area of the top surface of the first cured layer near the edge is sprayed. If the first curing layer extends from the edge of the first curing layer to the central position to a region less than or equal to 1 millimeter or less than or equal to 2 millimeters, the spraying time can be shortened, and the paint can be saved.

In addition, in some embodiments, if the subsequent layer of the first cured layer, that is, the second cured layer, is smaller, and if the spraying is simply performed according to the preset area, the area of the top surface of the first cured layer that is not coated cannot be covered, the method may further include determining, according to the coating information of the first cured layer, the preset area of the first cured layer, determining whether an additional area exists between the vertical projection of the second cured layer on the first cured layer and the preset area of the first cured layer, for example, determining whether the additional transparent area formed by the transparent resin in the embodiment, or determining whether the vertical projection of the second cured layer on the first cured layer does not cover all areas except the preset area, if any, controlling the spray head assembly to spray the coating to the preset area and the additional area. And when the second curing layer is smaller, the top surface of the first curing layer leaked from the outer side of the second curing layer is completely covered by the coating, so that the phenomenon of uncolour does not occur. In some embodiments, the difference in the areas can also be determined by comparing the area of the first cured layer with the area of the second cured layer. And if so, calculating an area difference value according to the area of the first curing layer and the area of the second curing layer, and judging whether an additional area exists between the vertical projection of the second curing layer on the first curing layer and the preset area of the first curing layer or not through the comparison of the area difference value and the area of the preset area. For example, the area of a first cured layer is 10 square centimeters, the area of a second cured layer is 1 square centimeter, and the preset area of the first cured layer is 3 square centimeters, so that the difference of the areas is 9 square centimeters, and the difference of the areas is larger than the preset area, which means that the area of the first cured layer is 3 square centimeters except the preset area, and an additional area of 6 square centimeters needs to be sprayed to form a coating, so that the surface of the first cured layer can be covered by the coating. In some embodiments, the difference in area may also be compared by corresponding to the number of pixels occupied by the cured layer to make the area comparison. In other embodiments, the area may be obtained by comparing other parameters, such as integrating the area in the outline of the corresponding cured layer, and then comparing the areas, or calculating the number of square tiles occupied by the corresponding cured layer to obtain the corresponding area.

S1-3, controlling the curing mechanism 300 to project curing light to the paint so as to cure the paint on the first curing layer to form a coating layer of the first curing layer.

The projecting of the curing light to the paint may be to project the curing light to the paint on the first curing layer in accordance with the outline of the first curing layer or to project the curing light to the paint only in accordance with the outline of the paint, reducing the power consumption. After the coating is sprayed, the upper surface of the first curing layer is sprayed with the coating, and the coating is cured and adhered on the first curing layer by the irradiation of the curing light on the coating, so that the coating of the first curing layer is formed. That is, the light machine irradiates light twice before and after coating, the resin is cured for the first time, and the coating is cured for the second time.

In one embodiment, as shown in fig. 7, the present invention further provides another method for three-dimensional molding, including:

s2-1, acquiring a plurality of curing layers of the model to be printed and color information corresponding to the curing layers.

The plurality of curing layers and the color information can be read through a local file, an external memory or obtained through a cloud platform. The plurality of cured layers of the printing model comprise contour information of each cured layer, and the painting information comprises colors of paint of each cured layer and spraying areas corresponding to the colors.

S2-2, taking one of the plurality of curing layers as a first curing layer, wherein the first curing layer can be a first layer or an intermediate layer of the model, for example, the printing of a color model can be carried out at the latter half of the printing of the model, and the intermediate layer can be selected as the first curing layer.

S2-3, controlling the molding platform 210 to move to an initial position, and controlling the scraper assembly 120 to move in a preset scraper direction so as to scrape off excessive resin.

The initial position of the molding stage 210 refers to the position of the upper surface of the molding stage 210 and the resin level, or the position of the upper surface of the molding stage 210 and the preset level, which is separated by the first layer of the mold height. The thickness of the layer of the model, which is uniformly spaced from the resin liquid surface on the upper surface of the molding platform 210, ensures that the solidified layer is uniform.

S2-4, controlling the curing mechanism 300 to irradiate the resin above the molding platform 210 according to the outline of the first curing layer so that the resin forms the first curing layer according to the outline of the first curing layer.

S2-5, controlling the scraper assembly 120 to move in the preset scraper direction so as to scrape off the superfluous resin.

After the cured layer is formed, the resin around the first cured layer may flow into the top surface of the first cured layer due to vibration and other reasons, and the doctor blade 122 is controlled to remove the resin on the first cured layer, so that the position of the paint sprayed on the first cured layer is stable, the paint cannot flow along with the redundant resin, and inaccurate color positions are avoided.

S2-6, controlling the spray head assembly 410 to spray paint to the first curing layer according to the painting information of the first curing layer; the curing mechanism 300 is controlled to project curing light toward the coating material to cure the coating material on the first cured layer to form a coating layer of the first cured layer.

S2-7, controlling the forming platform 210 to move away from the resin liquid level by a preset layer height so as to form resin with the preset layer height on the first solidified layer.

The molding platform 210 drives the first cured layer and the coating thereon to dip into the resin, which flows over the first cured layer to form a new resin to be cured.

S2-8, controlling the scraper assembly 120 to move in the preset scraper direction so as to scrape off the superfluous resin.

The molding platform 210 sinks to enable the first curing layer to be immersed in resin, the resin flows to the upper surface of the first curing layer, the scraper 122 is controlled to move, the level of the resin is ensured to be flat and the thickness of a layer of model is uniform with the upper surface of the first curing layer, and the problem that the resin flows unevenly due to the tension of the resin is avoided.

S2-9, controlling the curing mechanism 300 to irradiate the resin above the first cured layer in accordance with the profile of the second cured layer such that the resin forms the second cured layer in accordance with the profile of the second cured layer, in some embodiments at least a portion of the second cured layer may adhere to the coating of the first cured layer, in other embodiments two adjacent cured layers may differ substantially in area, the difference between the areas of the cured layers of the first layer and the cured layer of the subsequent layer may be exactly the area of the corresponding coating, in which case the cured layer of the subsequent layer is not directly adhered to the corresponding coating but is on the side of the corresponding coating.

It is understood that the second cured layer is a layer of the model adjacent to the first cured layer in the model slice data, and is not a coating.

S2-10, controlling the scraper assembly 120 to move in the preset scraper direction so as to scrape off the superfluous resin.

S2-11, controlling the spray head assembly 410 to spray paint to the second curing layer according to the painting information of the second curing layer; the curing mechanism 300 is controlled to project curing light toward the coating material to cure the coating material on the second cured layer to form a coating layer of the second cured layer.

The curing process and the coloring process of the second curing layer are the same as those of the first curing layer, the steps 2-7 to 2-11 are repeatedly executed, and the curing and the coloring of the third curing layer, the fourth curing layer and the fifth curing layer … … are carried out layer by layer until the printing of the model is completed or the printing of the designated color area of the model is completed.

In embodiments including a level adjustment assembly including a level sensor, a feed member 140, and a discharge member 160, the method further includes receiving in real time a resin level sent from the level sensor, controlling the feed member to fill the printing space with resin when the resin level is below a preset level, and controlling the discharge member to discharge the resin in the printing space when the resin level is below the preset level. Thereby ensuring that the resin liquid level is always at the preset liquid level height, and the height of the top surface of the cured model can be effectively controlled by being matched with the scraping of the scraper 122.

In one embodiment, the additive manufacturing apparatus further comprises a memory for storing a computer program;

the laminate manufacturing apparatus further comprises a processor for performing the steps of the stereolithography method of any of the preceding claims when executing the computer program.

In yet another aspect, the present application provides a computer readable storage medium having stored therein at least one executable instruction for causing a processor to perform the steps of the stereolithography method of any of the preceding claims.

Based on such understanding, the technical solution of the present application may be embodied in the form of a software product, where the software product to be identified may be stored in a non-volatile storage medium, such as a CD-ROM, a usb disk, a mobile hard disk, etc., and includes several instructions to enable a computer device to be a personal computer, a server, or a network device, etc., to execute the stereoscopic shaping method according to the present application.

The application also provides the following embodiments:

embodiment 1, a stereolithography apparatus, comprising: a chute assembly 100, the chute assembly 100 including a printing space for accommodating a resin;

a printing platform assembly 200, the printing platform assembly 200 comprising a molding platform 210, at least part of the structure of the molding platform 210 being located in the printing space;

A curing mechanism 300, the molding platform 210 of the curing mechanism 300 is opposite to the molding platform, and is used for projecting curing light to the resin so as to form a curing layer on the resin;

the painting mechanism 400, the painting mechanism 400 includes a spray head assembly 410, the spray head assembly 410 being opposite the forming table 210 for spraying the coating onto the cured layer, the curing mechanism 300 being further configured to project curing light onto the coating to cure the coating on the cured layer to form a coating.

Embodiment 2, the stereolithography apparatus according to embodiment 1, the painting mechanism 400 further includes a moving assembly 420, the nozzle assembly 410 being connected to the moving assembly 420;

the moving assembly 420 is used to drive the spray head assembly 410 to move at least in a plane parallel to the resin level;

the spray head assembly 410 is used for spraying a coating to a preset area of the cured layer in cooperation with the moving assembly 420, wherein the vertical projection of the preset area on the forming platform 210 and the vertical projection of the cured layer on the forming platform 210 are at least partially overlapped, or the preset area is on the top surface of the forming platform 210 opposite to the cured layer and extends to the peripheral area of the edge of the cured layer.

Embodiment 3, the stereolithography apparatus according to embodiment 2, the paint comprising at least one color, the spray head assembly 410 comprising a spray head body 411, a cartridge 412, and a feeding member, the cartridge 412 for storing the paint;

The nozzle body 411 is connected with the moving assembly 420, the nozzle body 411 comprises at least one nozzle which can be opened and closed, a feeding member is connected with the cartridge 412 and the nozzle body 411, and the feeding member is used for conveying paint to the nozzle body 411.

Embodiment 4, the stereolithography apparatus according to embodiment 2, the moving assembly 420 includes an X-axis moving unit 421 and a Y-axis moving unit 422, the showerhead assembly 410 is connected to the X-axis moving unit 421, the X-axis moving unit 421 is connected to the Y-axis moving unit 422, the X-axis moving unit 421 is configured to drive the showerhead assembly 410 to move in the X-axis direction, and the Y-axis moving unit 422 is configured to drive the X-axis moving unit 421 to drive the showerhead assembly 410 to move in the Y-axis direction;

the number of the Y-axis moving units 422 is two, the Y-axis moving units 422 are respectively positioned at different two sides of the periphery of the trough assembly 100, and two ends of the X-axis moving unit 421 are respectively connected with the two Y-axis moving units 422.

Embodiment 5 the stereolithography apparatus according to embodiment 1, the chute assembly 100 comprising a chute 110 and a doctor blade assembly 120, the chute 110 comprising a printing space, the doctor blade assembly 120 being located above the molding platform 210 for movement in a preset doctor blade direction parallel to the resin level to scrape off excess resin;

the doctor blade assembly 120 includes a power unit 121 and a doctor blade 122, the doctor blade 122 is connected to the power unit 121, the doctor blade 122 extends from a first side of the printing space to a second side of the printing space opposite to the first side, a bottom end of the doctor blade 122 is located at a predetermined doctor blade height and above the molding platform 210, and the doctor blade 122 is used for being driven by the power unit 121 to move in a predetermined doctor blade direction to scrape off excessive resin.

In embodiment 6, the stereoscopic shaping apparatus according to embodiment 5, the extending direction of the doctor blade 122 forms a predetermined angle with the predetermined doctor blade direction.

Embodiment 7, the stereolithography apparatus according to embodiment 1, the chute assembly 100 further comprising a level adjustment assembly for positioning the level of the resin in the printing space at a preset level;

the liquid level regulating member comprises a liquid discharge hole 130 positioned on the side wall of the trough 110, the vertical direction height of the bottommost end of the liquid discharge hole 130 is positioned at the preset liquid level, the liquid discharge hole 130 is used for discharging resin higher than the preset liquid level, the liquid level regulating member 130 further comprises a feeding member 140 and a liquid collecting member 150, the feeding member 140 is communicated with the printing space, the feeding member 140 is used for filling resin into the printing space, the liquid collecting member 150 is communicated with the printing space through the liquid discharge hole 130, and the liquid collecting member 150 is used for collecting the resin flowing out of the liquid discharge hole 130;

alternatively, the level adjusting member 130 includes a level sensor for detecting a level of the resin, a feeding member 140 communicating with the printing space for filling the printing space with the resin, and a discharging member 160 communicating with the printing space for discharging the resin in the printing space;

Alternatively, the trough assembly 100 includes a trough 110 and a scraper assembly 120, the trough 110 includes a trough body and a partition plate, the partition plate is connected with the trough body, the trough 110 includes a printing space and an auxiliary space, the printing space and the auxiliary space are respectively located at two sides of the partition plate, and the scraper assembly 120 is used for moving to scrape off the excessive resin so as to push the excessive resin to the auxiliary space.

Embodiment 8, the stereolithography apparatus according to embodiment 1, the printing platform assembly 200 further comprises a lifting assembly 220, the molding platform 210 being connected to the lifting assembly 220, the lifting assembly 220 being configured to drive the molding platform 210 to move at least in a direction perpendicular to the resin liquid surface;

and/or, the stereolithography apparatus further comprises a support base 500, the support base 500 comprises a top plate 510 and a bottom frame 520 which are connected, a printing opening is arranged on the top plate 510, the trough assembly 100 is connected with the edge of the printing opening, and at least part of the trough assembly 100 is positioned between the top plate 510 and the bottom frame 520, and the printing platform assembly 200, the curing mechanism 300 and the painting mechanism 400 are directly or indirectly connected to the top plate 510.

Embodiment 9, the stereolithography apparatus according to embodiment 1, the curing mechanism 300 comprises a DLP light engine.

Embodiment 10, a method of stereolithography, comprising:

Controlling a curing mechanism to irradiate resin above the forming platform according to the outline of the first curing layer so that the resin forms the first curing layer according to the outline of the first curing layer;

controlling the spray head assembly to spray paint to the first curing layer according to the painting information of the first curing layer;

the curing mechanism is controlled to project curing light toward the coating material to cure the coating material on the first cured layer to form a coating layer of the first cured layer.

Embodiment 11, the stereoscopic shaping method according to embodiment 10, the painting information includes a preset area and paint color information, the method further including: controlling the spray head assembly to spray paint according to the preset area and the paint color information;

or: the spray head assembly is controlled to spray paint according to the outline of the first solidified layer and the paint color.

Embodiment 12, the stereolithography method according to embodiment 11, the predetermined area comprising: the peripheral area which occupies a preset proportion of the total area of the first curing layer and needs to be sprayed, or the peripheral area with preset pixel number, or the peripheral area with preset distance.

In example 13, the stereolithography method according to example 12, the peripheral region is an annular region near the edge of the first cured layer.

Embodiment 14, the stereolithography method according to embodiment 12, wherein the preset ratio is a ratio value of 1% -20%, the preset number of pixels is an integer of 1 to 10, and the specific distance of 1 mm to 10 mm is preset.

Example 15 the stereolithography method according to example 10, wherein controlling the curing mechanism to project curing light to the paint specifically comprises:

the curing light is projected toward the coating material in accordance with the contour of the first cured layer, or the curing light is projected toward the coating material in accordance with the contour of the coating material.

Embodiment 16, the stereolithography method according to embodiment 10, the method further comprising:

acquiring color coating information corresponding to a plurality of curing layers of a model to be printed;

taking one of the plurality of cured layers as a first cured layer;

controlling the forming platform to move to an initial position;

the method further comprises the steps of: controlling the forming platform to move away from the resin liquid level by a preset layer height so as to form resin with the preset layer height on the first curing layer;

controlling the curing mechanism to irradiate the resin above the first curing layer according to the outline of the second curing layer so that the resin forms the second curing layer according to the outline of the second curing layer;

controlling the spray head assembly to spray paint to the second curing layer according to the painting information of the second curing layer;

the curing mechanism is controlled to project curing light toward the coating material to cure the coating material on the second cured layer to form a coating layer of the second cured layer.

Embodiment 17, the stereolithography method according to embodiment 10, the method further comprising:

The doctor assembly is controlled to move in a preset doctor direction to scrape off the excess resin.

Embodiment 18, the stereolithography method according to embodiment 10, controlling the showerhead assembly to spray paint to the first cured layer according to the paint information of the first cured layer, comprising:

controlling the spray head assembly to move relative to the forming platform, so that the spray head assembly sprays paint to the first curing layer according to the painting information of the first curing layer; or (b)

Controlling the forming platform to move relative to the spray head assembly, so that the spray head assembly sprays paint to the first curing layer according to the painting information of the first curing layer; or (b)

The spray head assembly and the forming platform are controlled to move simultaneously, so that the spray head assembly sprays paint to the first curing layer according to the painting information of the first curing layer;

example 19, the stereolithography method according to example 10, controlling the showerhead assembly to spray paint to the first cured layer according to the paint information of the first cured layer, comprising:

the spray head assembly is controlled to spray paint to a preset area of the first curing layer according to the painting information of the first curing layer, the vertical projection of the preset area on the forming platform is at least partially overlapped with the vertical projection of the first curing layer on the forming platform,

or, the spray head assembly is controlled to spray paint to a preset area of the first curing layer according to the painting information of the first curing layer, wherein the preset area is formed on the top surface of the forming platform 210 of the first curing layer opposite to each other and extends to the peripheral area of the edge of the first curing layer;

Or determining a preset area of the first curing layer according to the color information of the first curing layer, judging whether an additional area exists between the vertical projection of the second curing layer on the first curing layer and the preset area of the first curing layer, and if so, controlling the spray head assembly to spray paint to the preset area and the additional area.

Embodiment 20 the stereolithography method of embodiment 19, wherein the area difference is calculated according to the area of the first cured layer and the area of the second cured layer, and the comparison between the area difference and the area of the predetermined area is used to determine whether the second cured layer has an additional area between the vertical projection of the second cured layer on the first cured layer and the predetermined area of the first cured layer.

Embodiment 21, the stereolithography method according to embodiment 10, the method further comprising:

receiving the resin liquid level sent by a liquid level sensor;

judging the relation between the liquid level and the preset liquid level, and controlling the feeding part to fill resin into the printing space when the liquid level is lower than the preset liquid level;

when the liquid level is higher than the preset liquid level, the discharging part is controlled to discharge the resin in the printing space until the liquid level is the same as the preset liquid level.

Embodiment 22, a stereolithography apparatus, comprising:

A memory for storing a computer program;

a processor for implementing the steps of the stereolithography method according to any one of the foregoing embodiments 10 to 21 when executing a computer program.

Embodiment 23, a computer-readable storage medium having stored therein at least one executable instruction for causing a processor to perform the steps of the stereolithography method of any of the foregoing embodiments 10 to 21.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A stereolithography apparatus, comprising:

a chute assembly including a print space for receiving a resin;

a print platform assembly comprising a shaping platform, at least part of the shaping platform being located in the print space;

the curing mechanism is opposite to the forming platform and is used for projecting curing light to the resin so as to enable the resin to form a curing layer;

The coating mechanism comprises a spray head assembly, the spray head assembly is opposite to the forming platform and used for spraying paint to the curing layer, and the curing mechanism is also used for projecting curing light to the paint so as to enable the paint on the curing layer to be cured to form a coating.

2. The stereolithography apparatus as claimed in claim 1, wherein,

the color coating mechanism further comprises a moving assembly, and the spray head assembly is connected with the moving assembly;

the moving assembly is used for driving the spray head assembly to move at least in a plane parallel to the resin liquid level;

the spray head assembly is used for spraying the paint to a preset area of the curing layer in cooperation with the moving assembly, the vertical projection of the preset area on the forming platform and the vertical projection of the curing layer on the forming platform are at least partially overlapped, or the preset area is formed by the fact that the curing layer is opposite to the top surface of the forming platform and extends to the peripheral area of the edge of the curing layer.

3. The stereolithography apparatus as claimed in claim 1, wherein,

the trough assembly comprises a trough and a scraper assembly, the trough comprises the printing space, and the scraper assembly is positioned above the forming platform and is used for moving in a preset scraper direction parallel to the resin liquid level so as to scrape off excessive resin;

The scraper assembly comprises a power unit and a scraper, the scraper is connected with the power unit, the scraper extends from a first side of the printing space to a second side of the printing space opposite to the first side, the bottom end of the scraper is located at a preset scraper height and above the forming platform, and the scraper is used for moving in the preset scraper direction under the driving of the power unit so as to scrape redundant resin.

4. The stereolithography apparatus as claimed in claim 1, wherein,

the liquid level adjusting component is used for enabling the liquid level of the resin in the printing space to be at a preset liquid level height;

the liquid level regulating part comprises a liquid discharge hole positioned on the side wall of the trough, the vertical height of the bottommost end of the liquid discharge hole is positioned at the preset liquid level, the liquid discharge hole is used for discharging resin higher than the preset liquid level, the liquid level regulating part further comprises a feeding part and a liquid collecting part, the feeding part is communicated with the printing space, the feeding part is used for filling resin into the printing space, the liquid collecting part is communicated with the printing space through the liquid discharge hole, and the liquid collecting part is used for collecting the resin flowing out of the liquid discharge hole;

Or the liquid level regulating part comprises a liquid level sensor, a feeding part and a discharging part, wherein the liquid level sensor is used for detecting the height of the liquid level of the resin, the feeding part is communicated with the printing space and is used for filling the printing space with the resin, and the discharging part is communicated with the printing space and is used for discharging the resin in the printing space;

or, the silo subassembly includes silo and scraper subassembly, the silo includes cell body and baffle, the baffle with the cell body is connected, the silo includes print space and auxiliary space, print space with auxiliary space is located respectively the both sides of baffle, the scraper subassembly is used for removing and scrapes unnecessary resin, in order to with unnecessary resin propelling movement extremely auxiliary space.

5. A method of three-dimensional molding, comprising:

controlling a curing mechanism to irradiate resin above a molding platform according to the outline of a first curing layer so that the resin forms the first curing layer according to the outline of the first curing layer;

controlling a spray head assembly to spray paint to the first curing layer according to the painting information of the first curing layer;

controlling the curing mechanism to project curing light to the paint so as to cure the paint on the first curing layer to form a coating of the first curing layer.

6. The stereolithography method of claim 5, wherein the paint color information includes a predetermined area and paint color information, the method further comprising:

controlling a spray head assembly to spray paint according to the preset area and the paint color information;

or:

and controlling a spray head assembly to spray paint according to the outline of the first solidified layer and the paint color.

7. The stereolithography method of claim 5, further comprising:

acquiring a plurality of curing layers of a model to be printed and color information corresponding to the curing layers;

taking one of the plurality of cured layers as the first cured layer;

controlling the forming platform to move to an initial position;

the method further comprises the steps of: controlling the forming platform to move a preset layer height away from the resin liquid level so as to form the resin with the preset layer height on the first curing layer;

controlling the curing mechanism to irradiate the resin above the first curing layer according to the outline of the second curing layer so that the resin forms the second curing layer according to the outline of the second curing layer;

controlling the spray head assembly to spray the paint to the second curing layer according to the painting information of the second curing layer;

Controlling the curing mechanism to project the curing light toward the coating material to cure the coating material on the second cured layer to form a coating layer of the second cured layer.

8. The stereolithography method of claim 5, wherein controlling the spray head assembly to spray paint onto the first cured layer according to the paint information of the first cured layer comprises:

controlling the spray head assembly to spray the paint to a preset area of the first curing layer according to the painting information of the first curing layer, wherein the vertical projection of the preset area on the forming platform is at least partially overlapped with the vertical projection of the first curing layer on the forming platform,

or, the spray head assembly is controlled to spray the paint to a preset area of the first curing layer according to the painting information of the first curing layer, wherein the preset area is formed by the fact that the first curing layer is opposite to the top surface of the forming platform and extends to the peripheral area of the edge of the first curing layer;

or determining a preset area of the first curing layer according to the color information of the first curing layer, judging whether an additional area exists between the vertical projection of the second curing layer on the first curing layer and the preset area of the first curing layer, and if so, controlling the spray head assembly to spray the paint to the preset area and the additional area.

9. A stereolithography apparatus, comprising:

a memory for storing a computer program;

a processor for implementing the steps of the stereolithography method according to any of claims 5 to 8 when executing said computer program.

10. A computer-readable storage medium having stored therein at least one executable instruction for causing a processor to perform the steps of the stereolithography method according to any of claims 5 to 8.