KR20210098721A - Method for controlling tilting speed through object shape of layer - Google Patents

Abstract

According to one embodiment of the present invention, a method of controlling tilting speed through object shape of layer in a 3D printer includes: performing a control to operate a modeling light source for irradiating a molding light for curing a photocurable resin upward; and performing a control, when the photocurable resin accommodated in a material tray disposed on an upper side of the modeling light source is determined to be cured by the irradiation of the modeling light so that a first layer among a plurality of layers separated through 3D modeling is modeled, to perform a tilting process of lifting and lowering a lifting/lowering modeling table disposed on an upper side of the material tray to model the second layer, wherein the performing of the control to perform the tilting process includes performing a control to increase a lifting and lowering speed of the lifting/lowering modeling table as a sectional area of an object becomes narrow, and the object becomes closer to a center portion of the lifting/lowering modeling table based on a shape of the object included in the first layer.

Description

How to control the tilt speed through the shape of objects in a layer

The present invention relates to a method of controlling a tilting speed through the shape of an object of a layer, and more particularly, for each of a plurality of layers separated through 3D modeling, based on the shape of the object included in the layer, the cross-sectional area of the object is It relates to a method for differently controlling the tilting speed for each layer by controlling the elevating speed of the elevating mould to be faster as it is narrow and the object is located closer to the center of the elevating mould.

A three-dimensional printer (3D printer) refers to a printer that creates three-dimensional objects. The principle of a three-dimensional printer can be divided into two types: cutting and stacking. The cutting type cuts or grinds lump-shaped materials It is a method of obtaining a three-dimensional object of a desired three-dimensional shape from the inside out, and the stacked type is a method of realizing a three-dimensional object (output) of a desired three-dimensional shape by laminating thin layers.

Among these methods, a layered method is widely used to produce a sculpture by stacking thin layers. The stacked methods include FDM (Fused Deposition Modeling) method, DLP (Digital Light Processing) method, SLA (Stereo Lithography Apparatus) method, and SLS (Selective) method. laser sintering) method.

Specifically, the FDM method is a method of realizing a three-dimensional sculpture by stacking materials such as plastic layer by layer.

In addition, the DLP method is a method of realizing a three-dimensional sculpture by hardening a photocurable resin little by little by using the modeling light, which is UV light provided by the projector.

In addition, the SLA method is a laser printing method, and is a method of implementing a three-dimensional shape sculpture through an ultraviolet resin that is cured in ultraviolet light using a laser. , SLS method is also called powder sintering method, and it is a method of realizing a three-dimensional sculpture by melting powder using a laser and sintering it.

On the other hand, in the case of the DLP method, it is possible to form at a time in a plane unit, which has the advantage of a fast modeling speed. Also, the DLP method has an advantage in that the quality of the three-dimensional object is good compared to other methods.

In this DLP method, in order to obtain a three-dimensional shaped object, the elevating molding table is lowered and immersed in a material tray containing a photocurable resin. The resin is cured and the sculpture is gradually shaped while attached to the lower surface of the elevating mold, and at this time, the elevating mold that elevates in the photocurable resin gradually rises and the entire sculpture is shaped and manufactured.

In manufacturing the sculpture, in a state in which the sculpture is separated into a plurality of layers through 3D modeling, each of the separated layers is stacked one by one, and when stacked layer by layer from the bottom layer to the top layer, a 3D-shaped sculpture is produced The operation of raising and lowering the elevating platform in order to stack each layer is called tilting.

When manufacturing a sculpture, if the tilting speed is increased, the production time of the sculpture can be shortened, but there is a problem in that the stacking of layers is not stable. , there is a problem that the production time of the sculpture becomes long.

However, since the conventional 3D printer maintains the tilting speed constant regardless of the shape of the object of the layer by applying the same tilting time to each layer, efficiency in manufacturing the sculpture is inevitably reduced.

Accordingly, there is a need for a technology for efficiently operating a 3D printer by differently controlling a tilting speed for each layer according to the shape of an object of the layer.

The present invention is to solve the problems of the prior art described above. For each of a plurality of layers separated through 3D modeling, based on the shape of the object included in the layer, the cross-sectional area of the object is narrow and the object is placed in the center of the elevating platform. An object of the present invention is to provide a method for differently controlling the tilting speed for each layer by controlling the lifting speed of the lifting platform to be faster as it is located closer.

Objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood from the description below.

According to an embodiment of the present invention for achieving the above object, in the method of controlling the tilting speed through the object shape of the layer in a 3D printer, the shaping light source irradiating the shaping light for curing the photocurable resin upward controlling to operate; and the photocurable resin accommodated in the material tray disposed on the upper side of the shaping light source is cured by irradiation with the shaping light, and when it is confirmed that the first layer of the plurality of layers separated through 3D modeling is modeled, the upper side of the material tray A step of controlling the lifting molding table disposed in the to perform a tilting process in which the elevator is raised and lowered for the modeling of the second layer, wherein the controlling of the tilting process is based on the shape of the object included in the first layer, the There is provided a method of controlling the tilting speed through the shape of the object of the layer, characterized in that the object is located closer to the center of the elevating mold as the cross-sectional area of the object is narrow and the elevating speed of the elevating mold is controlled to increase.

In the controlling step of the tilting process, a control value is calculated by multiplying the cross-sectional area of the object and the distance the object is separated from the center point of the lifting platform, and the smaller the control value, the faster the lifting speed of the lifting platform is. can do.

In the control step of the tilting process, when there are a plurality of objects included in the first layer, the control values calculated for each object are summed so that the lower the summed control value is, the faster the lifting speed of the lifting platform is. can be controlled

In the control step of the tilting process, a lower weight is set as the number of layers pre-stacked on top of the first layer is smaller, so that the lower the control value to which the weight is applied is, the faster the lifting speed of the elevating mold can be controlled. there is.

In the control step of the tilting process, as the control value is smaller, it is possible to control the waiting time of the elevating mold to be shorter before being lifted for the modeling of the second layer.

The material tray, the receiving member having an upper and lower open receiving space; a light-transmitting film unit blocking a lower portion of the accommodation space so that the photocurable resin is accommodated in the accommodation space, and transmitting the shaping light irradiated from the shaping light source and passing through the accommodation space; and a film clamp installed on the lower rim of the accommodating member so as to fix the light transmitting film unit to the lower rim of the accommodating member. In a state in which the upper part of the layer is connected to the lifting mold, it may have releasability and elasticity so that it is non-deformable even if it is pulled by the lower part of the first layer by tension when the lifting mold is raised.

According to an embodiment of the present invention, for each of the plurality of layers separated through 3D modeling, based on the shape of the object included in the layer, the narrower the cross-sectional area of the object and the closer the object is to the center of the elevator By controlling the elevating speed to be fast, when the cross-sectional area of an object is narrow and the object is located close to the center of the elevating platform, the elevating speed is controlled quickly to shorten the layer modeling time, and the cross-sectional area of the object is wide and the object is placed on the elevating mold If it is located far from the central part of the object, it is possible to increase the efficiency of the sculpture production by controlling the elevating speed to be slow so that the layer is formed more stably.

It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a diagram schematically showing the overall configuration of a 3D printer according to an embodiment of the present invention.
2 to 4 are diagrams schematically illustrating a partial configuration of a 3D printer for controlling a tilting speed through a shape of an object of a layer according to an embodiment of the present invention.
5 is a perspective view showing a material tray of the 3D printer according to the present invention.
6 is an exploded perspective view showing the material tray of FIG.
7 is a longitudinal cross-sectional view showing the material tray of FIG.
8 and 9 are views showing a light-transmitting film unit in the material tray of FIG.
10 is a view schematically showing a process of printing a sculpture with a 3D printer having a material tray according to the present invention equipped with a light-transmitting film of a multi-layer laminated structure.

Prior to the detailed description of the present invention, the terms or words used in the present specification and claims described below should not be construed as being limited to their ordinary or dictionary meanings, and the inventors should develop their own inventions in the best way. For explanation, it should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be appropriately defined as a concept of a term. Accordingly, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical spirit of the present invention, so various equivalents that can be substituted for them at the time of the present application It should be understood that there may be water and variations.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, it should be noted that the same components in the accompanying drawings are denoted by the same reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings, and the size of each component does not fully reflect the actual size.

First, a 3D printer according to an embodiment of the present invention will be described. 1 is a diagram schematically showing the overall configuration of a 3D printer according to an embodiment of the present invention.

Referring to FIG. 1 , the 3D printer according to an embodiment of the present invention may include a material tray 1, a lifting platform 2, a modeling light source 3 and a control unit 4, and the 3D printer includes Each component may be connected to each other.

Throughout the specification, when a part is "connected" with another part, this includes not only the case of being "directly connected" but also the case of being "indirectly connected" with another member interposed therebetween. can

The material tray 1 is disposed on the upper side of the modeling light source 3 and can accommodate the photocurable resin (R).

In the material tray 1, the shield 1a is thinly applied to the bottom of the inside for releasability of the object P. Since this shield 1a is weak and easy to break, it is implemented by replacing it with a light transmitting film unit to be described later. may be, and a detailed description related thereto will be described later with reference to FIGS. 5 to 10 .

The lifting platform 2 may be configured to be lifted and lowered by the 3D printer as a part to be attached when the three-dimensional object P is formed on the lower surface.

The lifting platform 2 is installed to be rotated by a screw vertical shaft 2a that is axially rotated by a motor, and can be raised or lowered by rotation of the screw vertical shaft 2a.

The lifting platform 2 is disposed on the upper side of the material tray 1 , and a tilting process of lifting and lowering to obtain the sculpture P may be performed.

The shaping light source 3 may be implemented as a light source irradiating the shaping light 3a for curing the photocurable resin (R), which is a material required for manufacturing the object (P).

The shaping light source 3 is disposed on the lower side of the material tray 1, and can irradiate the shaping light 3a for curing the photocurable resin R upward.

The control unit 4 can control the overall operation of the 3D printer, and by processing signals, data, information, etc. input or output through the components included in the 3D printer, or driving an application program, the function of the 3D printer is smooth It is possible to control the operation of the components included in the 3D printer to be provided.

For example, the control unit 4 may control the lifting speed of the lifting platform 2 and control the range of the modeling light 3a irradiated by the modeling light source 3 .

In manufacturing the sculpture (P), the lifting frame (2) is lowered by the control of the control unit (4), and the material tray (1) containing the photo-curable resin (R) can be immersed in the lifting frame (2). .

Thereafter, the shaping light source 3 can expose the shaping light 3a to the photocurable resin R under the control of the controller 4, and the photocurable resin R that receives the shaping light 3a is cured. As a result, the sculpture (P) is gradually shaped in a state attached to the lower surface of the elevating platform (2). can be shaped and manufactured.

According to an embodiment, the 3D printing process through the 3D printer may be sequentially performed in a 3D modeling preparation step, a layer image generation step, and a layer image stacking step.

Specifically, the 3D modeling preparation step is a step of preparing 3D modeling for the sculpture P to be output, and files such as obj and stl may be registered.

The layer image creation stage cuts 3D modeling thinly to a specified thickness and separates it into multiple layers. Each layer separated through 3D modeling is called a layer. Formation of the sculpture (P) can be completed, in this case, the sculpture (P) can be completed by hanging upside down connected to the lifting platform (2).

The layer image lamination step is a step of curing by irradiating the shaping light 3a in a layer shape to the photocurable resin (R) for a certain period of time. can do.

The tilting process is a process of elevating the lifting platform 2 to make a space for curing the next layer after curing one layer, and may be repeatedly performed until the production of the sculpture P is completed.

Hereinafter, in manufacturing the sculpture P separated into a plurality of layers through 3D modeling, a 3D printer for controlling the tilting speed through the object shape of the layer will be described.

2 to 4 are diagrams schematically illustrating a partial configuration of a 3D printer for controlling a tilting speed through a shape of an object of a layer according to an embodiment of the present invention.

First, the photo-curable resin (R) is accommodated in the material tray (1), and the modeling light source (3) disposed under the material tray (1) is controlled by the control unit (4). It is possible to irradiate the shaping light 3a for curing the light to the upper side.

The photocurable resin (R) is cured by irradiation of the modeling light (3a), so that any one of the plurality of layers separated through 3D modeling can be molded. As shown in FIG. 2, the first layer 11 ) can be molded and attached to the lower surface of the elevating platform (2) to be connected.

When the photo-curable resin (R) is cured by irradiation of the molding light (3a) and the first layer (11) is molded, the lifting molding table (2) is raised and lowered to mold the second layer next to the first layer (11) A tilting process may be performed.

The control unit 4 may control the elevating speed of the elevating platform 2 performing the tilting process to increase or decrease.

Specifically, based on the shape of the object included in the first layer 11 , the controller 4 controls the elevation of the elevator platform 2 as the cross-sectional area of the object is narrow and the object is located closer to the center of the elevator platform 2 . You can control the speed to increase.

That is, the control unit 4 can control the tilting speed through the shape of the object of the first layer 11 . By checking the cross-sectional areas of the objects included in the first layer 11 , the narrower the cross-sectional area of the object, the smaller the elevating platform. The lifting speed of (2) can be controlled to be faster, and the higher the cross-sectional area of the object, the lower the lifting speed of the lifting platform 2 can be controlled, and the positions of the objects included in the first layer 11 are checked As the object is located closer to the center of the elevating frame 2, the lifting speed of the elevating frame 2 is controlled to increase, and as the object is located farther from the center of the elevating frame 2, the elevating speed of the elevating frame 2 becomes slower. can be controlled to

For example, as shown in FIG. 3 , the first layer 11 may include a first object 11a and a second object 11b, and the controller 4 controls the first object 11a and the second object 11b. 2 Based on the shape of the object 11b, the cross-sectional areas of the first object 11a and the second object 11b are summed, and the lower the cross-sectional area of the summed objects is, the faster the lifting speed of the lifting platform 2 is controlled. The distance between the first object 11a and the second object 11b from the central part of the elevating form 2 is added up, and the closer the summed distance is, the faster the elevating speed of the elevating form 2 is. can be controlled to

According to an embodiment, in controlling the tilting speed, the control unit 4 multiplies the cross-sectional area of the object included in the first layer 11 and the separation distance from the central point of the lifting platform 2 to obtain a control value. It is calculated, and as the control value is smaller, it is possible to control the lifting speed of the lifting mold 2 to be faster.

That is, the control value can be calculated through the cross-sectional area and the separation distance of the objects included in the first layer 11. Table 1 shows the cross-sectional area of the object according to an embodiment of the present invention, The separation distance from the central point and the control value calculated therefrom are shown, and only a part of the distance may be shown for convenience of explanation.

cross-sectional area separation distance control value first object 20 One 20 second object 10 4 40

Referring to Table 1, the cross-sectional area of the first object 11a is 20, and since the separation distance of the first object 11a from the central point of the elevating platform 2 is 1, the control value of the first object 11a is 20 can be calculated by multiplying the cross-sectional area by the separation distance, the cross-sectional area of the second object 11b is 10, and the separation distance of the second object 11b from the center point of the elevating platform 2 is 4, so the second As the control value of the object 11b, 40 may be calculated by multiplying the cross-sectional area and the separation distance.

When there are a plurality of objects included in the first layer 11, the control unit 4 sums the control values calculated for each object, and controls so that the lower the summed control value is, the faster the lifting speed of the lifting platform 2 is. can

For example, when the control value of the first object 11a is 20 and the control value of the second object 11b is 40, the control unit 4 sums the control values calculated for each object to form the first layer 11 ) can be calculated as 60, and as the calculated control value is smaller, it is possible to control the lifting speed of the lifting mold 2 to be faster.

That is, by summing the control values of the objects included in the first layer 11, the elevating speed of the elevating mold 2 can be controlled. Table 2 shows the control values and the control values according to the embodiment of the present invention. As the elevating speed is indicated, only a portion thereof may be indicated for convenience of explanation.

control value Lifting speed (m/h) 10 6 20 5 30 4 40 3 50 2 60 One

Referring to Table 2, when the sum of the control values of the objects included in the first layer 11 is 10 or less, it is possible to control the elevating speed of the elevating mold 2 to be 6 m/h, and the first layer As a result of adding the control values of the objects included in (11), if the result is 20 or less, it is possible to control the lifting speed of the lifting platform 2 to be 5 m/h.

That is, the control unit 4 sums the control values calculated for each object, and controls the lifting speed of the lifting platform 2 to be faster as the summed control value is smaller, and as the summed control value is larger, the It can be controlled so that the lifting speed is slow.

According to an embodiment, in controlling the tilting speed, the control unit 4 sets a lower weight as the number of layers pre-stacked on top of the first layer 11 is smaller, and as the control value to which the weight is applied is smaller, the control unit 4 sets a lower weight. It is possible to control so that the lifting speed of (2) becomes faster.

That is, a plurality of layers separated through 3D modeling are stacked one by one from the bottom layer to the top layer to produce a 3D-shaped sculpture P, which is a layer pre-stacked on top when each layer is molded By checking the number, a lower weight is applied as the number of pre-stacked layers is smaller, so that the lifting speed of the lifting platform 2 can be controlled to increase.

For example, as shown in FIG. 4 , the first layer 11, the second layer 12, etc. are stacked one by one to produce the sculpture P. When the first layer 11 is modeled, the first layer 11 is formed. Since there is no pre-stacked layer on top of the first layer 11, the lowest weight can be applied to control the elevating speed of the elevating platform 2 to increase, and when the second layer 12 is molded, the second layer Since the pre-stacked first layer 11 is present on the upper portion of (12), a weight higher than the weight applied to the first layer 11 may be applied to control the lifting speed of the lifting platform 2 to be slow.

That is, when each layer is molded, the lifting speed of the lifting platform 2 can be controlled according to the number of layers pre-stacked on the upper part. Table 3 shows the number of layers pre-stacked on the upper part according to an embodiment of the present invention. and weights corresponding thereto, and only a portion thereof may be shown for convenience of explanation.

Number of pre-stacked layers weight 0 One One 1.5 2 2

Referring to Table 3, when the sum of the control values of the objects included in the first layer 11 is 20, the number of layers pre-stacked on the first layer 11 is 0, so a weight of 1 is applied to the final result. The control value is 20, and it is possible to control the lifting speed of the elevating mold 2 to be 5 m/h, and when the sum of the control values of the objects included in the second layer 12 is also 20, the second layer (11) Since the number of layers pre-stacked on the upper part is 1, a weight of 1.5 is applied, the final control value is 30, and it is possible to control so that the lifting speed of the lifting platform 2 is 4 m/h.

That is, even if the control value is the same for each layer, a lower weight is applied as the number of layers pre-stacked on the upper part is smaller, so that the lifting speed of the lifting platform 2 can be controlled to increase.

Through this, since the number of pre-stacked layers is small at the beginning of the production of the sculpture (P), it is possible to quickly control the elevating speed to shorten the modeling time of the layers, Therefore, it is possible to process the layer to be printed more stably by controlling the lifting speed slowly.

On the other hand, the control unit 4 sums up the control values of the objects included in the first layer 11, and as the summed control value is smaller, until the second layer 12 is lifted for modeling. It can be controlled to shorten the waiting time.

That is, it is possible to control the waiting time of the lifting platform 2 by summing the control values of the objects included in the first layer 11. Table 4 shows the control values according to the control values and the control values according to the embodiment of the present invention. As the waiting time is indicated, only a portion may be indicated for convenience of explanation.

control value Latency (ms) 10 One 20 2 30 3

Referring to Table 4, when the sum of the control values of the objects included in the first layer 11 is 10 or less, it is possible to control the elevating waiting time of the elevating mold 2 to be 1 ms, and the first layer ( When the sum of the control values of the objects included in 11) is 20 or less, it is possible to control the elevating mold 2 so that the elevating waiting time is 2 ms.

That is, the 3D printer according to an embodiment of the present invention first controls the shaping light source 3 irradiating the shaping light 3a for curing the photocurable resin R upward to operate, and When it is confirmed that the photocurable resin (R) accommodated in the material tray (1) disposed on the upper side is cured by irradiation of the molding light (3a) and the first layer (11) of the plurality of layers separated through 3D modeling is molded , it is possible to control to perform a tilting process in which the lifting molding table 2 disposed on the upper side of the material tray 1 is raised and lowered for the modeling of the second layer 12 .

The 3D printer controls the tilting process, based on the shape of the object included in the first layer 11, as the cross-sectional area of the object is narrow and the object is located closer to the center of the lifting platform 2 It can be controlled so that the ascending/lowering speed of the

In addition, in controlling the tilting process, the 3D printer calculates a control value by multiplying the cross-sectional area of the object and the separation distance away from the central point of the lifting platform 2, and the smaller the control value, the lower the control value. You can control the speed to increase.

In addition, when the 3D printer controls the tilting process, when there are a plurality of objects included in the first layer 11, the control values calculated for each object are added up, and as the summed control value is smaller, the It can be controlled so that the lifting speed becomes faster.

In addition, in controlling the tilting process, the 3D printer sets a lower weight as the number of layers pre-stacked on top of the first layer 11 is smaller, and the lower the weighted control value is, the smaller the lifting speed of the elevating platform 2 can be controlled to speed up.

In addition, in controlling the tilting process, the 3D printer can control the waiting time of the elevating platform 2 before being elevated for the modeling of the second layer 12 to be shorter as the control value is smaller.

On the other hand, the material tray 1 can be configured to include a light-transmitting film unit so that the molding light 3a is transmitted without being scattered to output a high-quality object P. It will be described with reference to FIG. 10 .

5 is a perspective view showing the material tray 1 of the 3D printer according to the present invention, and FIG. 6 is an exploded perspective view showing the material tray 1 of FIG. 5 .

In addition, FIG. 7 is a longitudinal sectional view showing the material tray 1 of FIG. 6 , and FIGS. 8 and 9 are views showing the light-transmitting film unit in the material tray 1 of FIG. 6 .

Referring to the drawings, the material tray 1 of the 3D printer according to the present invention includes a receiving member 110 , a light-transmitting film unit 120 , and a film clamp 130 .

Here, the accommodating member 110 is disposed between the upper lifting mold 2 and the lower shaping light source 3, and has an upper and lower open accommodating space 110a.

The accommodating member 110 accommodates a photocurable resin (R), which is a material for 3D printing, in the accommodating space (110a), the open upper portion of the accommodating space (110a) is the photocurable resin (R) is drawn in and elevates as well It is a moving route for the molding table 2 to be immersed in the photocurable resin (R), and the open lower part of the receiving space 110a is blocked by the light transmitting film unit 120 and the receiving space located above the light transmitting film (110a) to be accommodated in the photo-curable resin (R).

The light-transmitting film unit 120 is a part that blocks the lower portion of the accommodation space 110a so that the photocurable resin R is accommodated in the accommodation space 110a, and is irradiated from the modeling light source 3 to form the accommodation space 110a. It is a member through which the passing shaping light 3a, that is, the shaping light 3a emitted from the shaping light source 3 toward the elevating shaping table 2, is transmitted.

By the way, looking at the conventional material tray compared to the material tray 1 of the present invention having such a light-transmitting film unit 120, the conventional material tray does not use the light-transmitting film unit 120, and the photocurable resin The upper part is open and the lower part is closed so that (R) is accommodated, and the molding light 3a is made of a transparent material such as glass or acrylic to pass through the lower part.

Such a conventional material tray is made of about 5 mm thick for proper durability. In the material tray, the modeling light 3a is refracted and scattered in the process of penetrating the lower part of this thickness, and thus it is difficult to focus, so accurate dimensions There is a limitation in that the output of the sculpture P with is difficult, that is, the sculpture P with reduced dimensional accuracy and quality is manufactured.

Furthermore, as the thickness of the lower part of the conventional material tray increases, scattering due to refraction of the modeling light 3a increases, so that the dimensional accuracy and quality of the printed object P, which is an output, is further deteriorated.

In addition, in the conventional material tray, a releasable material such as a seal guard is applied to the inner lower surface to separate the sculpture during tilting, but the releasable material applied after about a week or at the latest about 1 month falls off or a whitening phenomenon (which changes to opaque) phenomenon), there is a disadvantage that it cannot be used for a long time.

Accordingly, in order to overcome the above-mentioned limitations and disadvantages, a transparent and thin single-layer film may be used for the material tray under the open lower portion of the receiving member.

By the way, since the lower part of the sculpture (P) manufactured by curing the photocurable resin (R) is attached to the monolayer film, the monolayer film is pulled when the lifting frame (2) to which the upper part of the sculpture (P) is connected is lifted. That is, there is a problem in that the monolayer film is easily deformed as the monolayer film is pulled by the tension of the cured layer of the object (P).

That is, since the cured layer is attached to the upper surface of the monolayer film, it is forcibly separated from the monolayer film in the process of forcibly moving upward along the elevating mold 2 in this tilting process.

In this tilting process, as the monolayer film is pulled upward by the upper tension of the hardened layer rising along the elevating mold 2 and stretched, the hardened layer of the sculpture P is separated from the monolayer film After the monolayer film You will cry unevenly like this wrinkle.

In particular, in the process of curing the photocurable resin (R), heat of about 60 to 80 degrees is generated, and the single-layer film is more easily bumpy by this heat, so that the quality of the finally printed object (P) is deteriorated. This happens.

Furthermore, if the single-layer film is disposed on the transparent plate, as the modeling light 3a irradiated from the modeling light source 3 is refracted in the transparent plate, the shape of the outputted object P is not molded to an exact value. There is a problem that the quality of the sculpture (P) is reduced.

Accordingly, in the material tray 1 of the present invention, in order to overcome the above-mentioned problems, the light transmitting film unit 120 having releasability and elasticity as a film through which the shaping light 3a is transmitted can be utilized.

That is, the light-transmitting film unit 120 of the present invention has releasability so that the photocurable resin (R) is cured so that the lower part of the sculpture (P) connected to the elevating mold (2) falls more easily, and the lower part of the sculpture (P) It has elasticity that can be restored to its original state without being deformed even when pulled by

Specifically, as shown in FIGS. 8 and 9 , the light-transmitting film unit 120 includes a release film 121 and an elastic film 122 to have a multi-layer laminate structure.

Because substantially the light transmitting film unit 120 is composed of one sheet and it is difficult to have the two characteristics of releasability and elasticity, the release film 121 and the elastic film 122 are combined to take a multi-layer laminated structure to achieve releasability and elasticity. It can have both elasticity. For reference, in this multi-layer laminated structure, since the films are combined, the refraction of the shaping light 3a hardly occurs as the thickness is maintained in a thin state.

Here, the release film 121 is a part that the photocurable resin (R) is in contact with, and is a film corresponding to the upper part of the light transmitting film unit 120 .

As this release film 121 has releasability so that the cured layer of the sculpture P can be easily removed, the light transmitting film unit 120 even by the tension of the sculpture P when the lifting mold 2 is raised. Try to pull it out as little as possible.

In addition, the elastic film 122 is a portion closely coupled to the lower surface of the release film 121 , and is a film corresponding to the lower portion of the light-transmitting film unit 120 .

Since the elastic film 122 has elasticity, even if the light transmitting film unit 120 is pulled by the tension of the sculpture P, it is not deformed and can be restored to its original state.

Finally, the light transmitting film unit 120 made of the above-described release film 121 and the elastic film 122, even if pulled by the tension of the sculpture (P) as shown in FIG. It is easily detached from the material and is restored to its original state by elasticity, so that almost no deformation occurs. For reference, reference numeral 2 denotes an elevating mold, 3 denotes a modeling light source, 3a denotes a molding light, L denotes an LCD, and La denotes an output shape of the LCD.

More specifically, the release film 121 and the elastic film 122 are preferably bonded to each other.

Since the release film 121 is a film that does not adhere well to other materials due to its material characteristics, in order to form a multi-layer laminated structure with the elastic film 122 in the light-transmitting film unit 120, it is adhered by an adhesive 123. become and combine

Specifically, the light-transmitting film unit 120 is coupled to the release film 121 or the elastic film 122 by applying the adhesive 123 to the release film 121 or the elastic film 122 and then combined in a rolling compression method by a roll to take a multi-layer laminated structure. .

For reference, the adhesive (not shown) other than the pressure-sensitive adhesive 123 is a material used to bond different types of materials. As a general adhesive, natural and synthetic organic polymers are used, and in special applications, inorganic and metal adhesives are also used. is used as

Such an adhesive is used in such a way that after being applied to an adherend, the adherend is cured to a certain extent immediately before being attached to the object, or cured immediately after being attached to the object. .

In comparison, the pressure-sensitive adhesive 123 used in the light-transmitting film unit 120 of the present invention is used to adhere the adherend to the object as a viscosity, so that the viscosity is maintained even after curing due to this adhesion.

The pressure-sensitive adhesive 123 is the biggest characteristic, and since it has a characteristic of maintaining viscosity even after curing, the release film 121 and the elastic film 122 can be easily attached to each other and combined.

Accordingly, the elastic film 122 is difficult to combine with the release film 121 by the adhesive, but it is possible to bond with the release film 121 by the adhesive 123, and the bonding by this adhesive maintains the viscosity. Therefore, it is continuously maintained in a state coupled to the release film 121 unless it is forcibly removed.

In addition, although not shown in the drawings, the elastic film 122 may be sequentially laminated and coupled to the lower surface of the release film 121 .

The light-transmitting film unit 120 preferably has elasticity as an elastic material, and at the same time has a hard characteristic to a certain extent so as not to be pulled too much by the tension of the hardened layer of the sculpture (P).

Accordingly, as a plurality of elastic films 122 are sequentially laminated and coupled to the lower surface of the release film 121, as the light transmitting film unit 120 becomes harder, a lot is not pulled by the tension of the sculpture P. , and ultimately, almost no deformation of the light-transmitting film unit 120 occurs.

In addition, the above-described release film 121 may be a fluorine-based film containing at least one of FEP, PFA, PTFE, and ETFE, and the elastic film 122 may include at least one of PET and PC. film may be used.

That is, when the film is prepared by including at least one of EP, PFA, PTFE, ETFE, PET, and PC, heat resistance and transparency are excellent, and in particular, at least one of EP, PFA, PTFE, and ETFE is included. The film has a very small coefficient of friction and excellent lubricity, so that it has excellent releasability. In addition, a film prepared by including at least one of PET and PC has a high elastic modulus and has excellent elasticity.

On the other hand, the film clamp 130 is installed on the lower edge of the accommodating member 110 so as to fix the light transmitting film unit 120 to the lower edge of the accommodating member 110 as shown in FIGS. 5 to 7 . do.

Here, the light-transmitting film unit 120 should be installed between the receiving member 110 and the film clamp 130 taut, that is, to prevent sagging in order to maximize the quality of the outputted object P.

Accordingly, the present invention can prevent sagging, wrinkles, etc. of the light transmitting film unit 120 by forming a step in which the height of the lower surface of the receiving member 110 and the upper surface of the film clamp 130 is different from each other. .

As described above, the configuration for preventing the light transmission film unit 120 from sagging is as follows.

The accommodation member 110 may include a body portion 111 , a clamp fastening portion 112 , and a step portion 113 .

At this time, the main body 111 has a cylindrical structure formed to be elongated to a certain extent in the vertical direction so that the receiving space 110a having the upper and lower portions open is formed.

In addition, the clamp fastening portion 112 is formed along the periphery at the lower end of the body portion 111, the film clamp 130 is fastened with the light transmitting film unit 120 interposed therebetween. And the film clamp 130 can take a structure in which the light-transmitting film unit 120 can be simply and easily replaced.

Specifically, a plurality of fastening holes 112a are formed in the clamp fastening portion 112 , and a plurality of through holes 120a corresponding to the plurality of fastening holes 112a are formed on the edge of the light transmitting film unit 120 . can be

In addition, on the upper surface of the film clamp 130 facing the clamp fastening part 112, a bolt protrusion 131 that is sequentially inserted into the through hole 120a and the fastening hole 112a is formed, and the bolt protrusion 131 has The nut member 139 may be fastened to have a structure in which the upper surface of the clamp fastening part 112 is pressed.

Due to this, the light transmitting film unit 120 can be simply and easily replaced, and also, due to the configuration of the step portion 113 to be described later, the light transmitting film unit 120 naturally when the light transmitting film unit 120 is installed. It can be installed by pulling this taut.

And, the step part 113 is formed to protrude downwardly at the lower end of the body part 111, and when the light-transmitting film unit 120 fixed by the film clamp 130 is pressed downward to push it, this clamp fastening part ( 112) is disposed below the upper surface.

Due to this step 113, the light transmitting film unit 120 is installed in the film clamp 130, that is, the edge of the light transmitting film unit 120 is caught by the bolt projection 131 of the film clamp 130. In the fixed position, in the process of the film clamp 130 being fastened to the clamp fastening part 112, the step part 113 pushes the light transmissive film unit 120 downward, so that the light transmissive film unit 120 is It can be installed by pulling it taut.

In addition to this, it is preferable that the step portion 113 has a chamfered outer edge of the lower end, which is a portion where the light transmitting film unit 120 is caught and changed. 120) is not damaged by the sharp edge, so that the tension of the light-transmitting film unit 120 can be stably maintained.

In addition, as the adhesion area of the step portion 113 with respect to the light transmitting film unit 120 by the above-described chamfering increases, in the receiving space 110a, the step portion 113 and the light transmitting film unit 120 are separated from each other. A stable airtight structure in which the photocurable resin (R) does not leak through the gap can be achieved.

In addition to this, a sealing member (C) may be attached to the lower surface of the clamp fastening part 112 along the circumference of the main body part 111, if there is a gap between the step part 113 and the light transmitting film unit 120. Even if the photo-curable resin (R) leaks through, as the gap between the clamp fastening part 112 and the film clamp 130 does not escape by the sealing member (C), a more stable airtight structure can be formed.

Furthermore, since the accommodating member 110 and the film clamp 130 are made of a metal material, only the light-transmitting film unit 120 is replaced and used, and the accommodating member 110 and the film clamp 130 can be used semi-permanently. Compared to the conventional material tray made of glass or acrylic material, maintenance cost can be reduced relatively.

As a result, the material tray 1 of the 3D printer according to the present invention is composed of a multi-layer laminated structure such that the light-transmitting film unit 120 has releasability and elasticity, whereby the photo-curable resin (R) is cured and the elevating mold ( Even if the lower portion of the sculpture P connected to 2) pulls the light transmitting film unit 120 with tension when the lifting frame 2 is raised, the light transmitting film unit 120 may be non-deformed.

That is, in the light transmitting film unit 120, the first layer 11 is molded and the upper part of the first layer 11 is connected to the elevating frame 2, and when the elevating frame 2 is raised, the first It may be made of a material having flexibility and elasticity so as to be non-deformable even when pulled by the lower portion of the layer 11 .

In addition, the present invention is formed to protrude downwardly at the lower end of the main body portion 111, the lower surface of the clamp fastening portion 112, the stepped portion 113 disposed below the upper surface of the configuration, by which the clamp fastening portion 112 is simply It is possible to pull the light transmitting film unit 120 taut with a simple and simple operation of fastening the film clamp 130 .

As described above, according to an embodiment of the present invention, for each of the plurality of layers separated through 3D modeling, based on the shape of the object included in the layer, the cross-sectional area of the object is narrow and the object is placed in the center of the lifting platform 2 By controlling the elevating speed of the elevating frame (2) to be faster as it is located closer, when the cross-sectional area of the object is narrow and the object is located closer to the center of the elevating form (2), the elevating speed is controlled quickly to shorten the layer forming time. If the cross-sectional area of the object is wide and the object is located far from the center of the elevating platform 2, the elevating speed may be controlled slowly to allow the layer to be molded more stably.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and likewise components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

1: Material tray 1a: Shield guard
2: elevating mold 2a: screw vertical shaft
3: shaping light source 3a: shaping light
4: control unit 11: first layer
11a: first object 11b: second object
12: second layer 110: receiving member
110a: accommodating space 111: body part
112: clamp fastening part 112a: fastening hole
113: step portion 113a: chamfered surface
120: light transmissive film unit 120a: through hole
121: release film 122: elastic film
123: adhesive 130: film clamp
131: bolt projection 139: nut member
C: Sealing member R: Photocurable resin
P: sculpture

Claims (6)

A method of controlling a tilting speed through the shape of an object of a layer in a 3D printer, the method comprising:
Controlling a modeling light source for irradiating upwardly illuminating the molding light for curing the photocurable resin to operate; and
When it is confirmed that the photocurable resin accommodated in the material tray disposed on the upper side of the modeling light source is cured by irradiation of the molding light and the first layer among the plurality of layers separated through 3D modeling is formed, the upper side of the material tray Including the step of controlling the arranged lifting platform to perform a tilting process that is raised and lowered for the modeling of the second layer,
The control step of the tilting process is,
Based on the shape of the object included in the first layer, as the cross-sectional area of the object is narrow and the object is located closer to the center of the lifting platform, the lifting speed of the lifting platform is controlled to increase, layer, How to control the tilt speed through the shape of the object. According to claim 1,
The control step of the tilting process is,
A control value is calculated by multiplying the cross-sectional area of the object and the distance that the object is separated from the center point of the lifting platform, and the smaller the control value, the faster the lifting speed of the lifting mold is, characterized in that the control of the layer How to control tilt speed via object shape. 3. The method of claim 2,
The control step of the tilting process is,
In the case where there are a plurality of objects included in the first layer, the control values calculated for each object are summed, and as the summed control value is smaller, the lifting speed of the lifting platform is controlled to increase. Layer, How to control the tilt speed through the shape of the object. 3. The method of claim 2,
The control step of the tilting process is,
Object shape of the layer, characterized in that by setting a lower weight as the number of layers pre-stacked on top of the first layer is smaller, and controlling the lifting speed of the elevating mold to be faster as the control value to which the weight is applied is smaller How to control the tilting speed via . 3. The method of claim 2,
The control step of the tilting process is,
The method of controlling the tilting speed through the object shape of the layer, characterized in that the control so that the waiting time of the elevating platform is controlled so that the waiting time of the elevating platform is shortened before the elevating for the modeling of the second layer is reduced as the control value is smaller. According to claim 1,
The material tray is
Receiving member having an upper and lower accommodating space open;
a light-transmitting film unit blocking a lower portion of the accommodation space so that the photocurable resin is accommodated in the accommodation space, and transmitting the shaping light irradiated from the shaping light source and passing through the accommodation space; and
and a film clamp installed on the lower edge of the receiving member to fix the light-transmitting film unit to the lower edge of the receiving member.
The light transmitting film unit,
In a state in which the first layer is molded and the upper part of the first layer is connected to the lifting mold, it has releasability and elasticity so that it is not deformed even if it is pulled by the lower part of the first layer by tension when the lifting mold is raised. A method of controlling the tilting speed through the shape of the object in the layer, characterized.

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