KR20210073213A - A vat photopolymerization 3d printer measuring adhesion for real-time - Google Patents

Abstract

The present invention relates to a photopolymerization 3D printer for measuring adhesive strength in real time, including: a linear actuator; a production platform moving in a vertical direction on the linear actuator; an adhesive strength measurement device disposed on a top of the production platform to measure adhesive strength applied to the production platform; and a resin tank for accommodating a photocurable resin molded into a structure by the production platform, wherein the resin tank includes a light-transmitting member, and a wall formed along an edge of a top surface of the member, one side surface of the wall has a lower height than remaining side surfaces of the wall so that the accommodated photocurable resin is observed, and a local damage resolving device operated based on the adhesive strength and configured to resolve the adhesive strength between the production platform and the member is disposed on a side surface of the wall that is adjacent to the linear actuator. Accordingly, stability of a product is ensured.

Description

A 3D printer with photo-curing method that can measure real-time adhesive strength {A VAT PHOTOPOLYMERIZATION 3D PRINTER MEASURING ADHESION FOR REAL-TIME}

The present invention relates to a photopolymerization type 3D printer capable of measuring adhesive force in real time, and more particularly, by measuring the adhesive force of a fabricated structure in real time, uniformly improving the adhesion between a material to be laminated and a resin tank, thereby effectively increasing the completeness of the product It relates to a 3D printer of photopolymerization method that can measure real-time adhesive force.

The conventional 3D printer of the photopolymerization method can be divided into a top-down method and a bottom-up method.

The top-down 3D printer is cured by irradiating a light source from the upper part of the resin material (Photopolymer) filled in a vat, and the Z-axis driving unit is installed while the cured material is fixed on the upper surface of the production platform. While moving in the downward direction, the next material layers are stacked in the upward direction.

The bottom-up 3D printer irradiates a light source from the bottom of the resin filled in the water tank to harden the material, and while the cured material is fixed to the bottom of the production platform, the Z-axis drive moves upward while the next material layer is lowered. It is manufactured by stacking in the direction.

A double top-down 3D printer uses a recoater to fabricate every layer of a structure, whereas a bottom-up 3D printer can omit the recoater when manufacturing a structure.

However, since the bottom-up type 3D printer creates a structure at the bottom of the production platform, manufacturing failures frequently occurred due to the adhesive force occurring at the bottom of the water tank when manufacturing large and heavy structures.

A release agent (also referred to as a "release film") has been developed to solve the above-described disadvantages of the conventional bottom-up 3D printer.

The release agent is applied to the water tank and configured to play a role in relieving the adhesive force in the lower part of the water tank. However, it is also difficult for the user to accurately determine the replacement timing, so that the problem of adhesion of only one layer may lead to damage in which the entire structure collapses.

The description underlying the invention has been prepared to facilitate understanding of the invention. It should not be construed as an admission that the matters described in the background technology of the invention exist as prior art.

The present invention was developed to solve problems such as the adhesive force of the conventional bottom-up method-based photopolymerization 3D printer, and the problem to be solved by the present invention is to measure the adhesive force in real time by installing an adhesive force measuring means on the production platform. The purpose of this invention is to provide a 3D printer of a photopolymerization method capable of real-time adhesive force measurement capable of testing products with increased release force by measuring the adhesive force compared to the cross-sectional area formed for each layer.

Another problem to be solved by the present invention is to provide a 3D printer of a light polymerization method capable of real-time measurement of adhesive force maximizing product efficiency by combining a means for resolving local damage in a resin tank.

Another problem to be solved by the present invention is to provide a light-curing 3D printer capable of measuring the adhesive force between the resin tank and the material in real time, thereby guiding the user on the correct time to replace parts and ensuring the stability of the product in real time. will do

Another problem to be solved by the present invention is to provide a photopolymerization type 3D printer capable of real-time adhesive force measurement capable of effectively extending the lifespan of a film by resolving local damage to the film by an adhesive force measuring means.

Another problem to be solved by the present invention is to provide a photopolymerization type 3D printer capable of real-time adhesive force measurement capable of improving market competitiveness by minimizing material consumption by immediately stopping operation when a manufacturing failure occurs.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above problems, the light polymerization type 3D printer capable of measuring real-time adhesive force according to an embodiment of the present invention is a linear actuator, a manufacturing platform that moves up and down in the linear actuator, and is disposed on the top of the manufacturing platform. Adhesive force measuring means for measuring the adhesive force applied to the; and a resin tank accommodating a photocurable resin molded into a structure by a manufacturing platform, wherein the resin tank includes: a member capable of transmitting light; and a wall formed along the upper edge of the member; but, one side of the wall is formed at a height lower than the other side of the wall so that the photocurable resin accommodated can be observed, and the side close to the linear actuator among the walls has an adhesive force. A means for resolving local damage that is operated based on and relieves the adhesive force between the manufacturing platform and the member may be disposed.

In addition, the lower portion of the resin tank may further include a light source for photocuring the photocurable resin by irradiating a laser beam so as to be laminated layer by layer on the lower surface of the manufacturing platform.

In addition, the adhesive force measuring means may measure the adhesive force by comparing the degree of adhesion between the resin tank and the photocurable resin before and after photopolymerization of the photocurable resin occurs by a laser beam.

In addition, it may further include an adhesive force detection device for receiving information about the adhesive force measured using the adhesive force measuring means, and controlling the movement of the resin tank based on the received adhesive force.

In addition, the resin tank may be formed in any one of a square, rectangular, and circular shape.

In addition, the resin tank can be moved in any one of a linear direction, a clockwise direction, and a counterclockwise direction by the local damage resolution means.

In addition, when the adhesive force is greater than a predetermined value, the adhesive force measuring means may move the resin tank so that the fabrication platform uses the other area of the member to fabricate the structure using the local damage resolution means.

In addition, the member may be a release film including a Teflon film and PDMS (PolyDiMethylSiloxane).

In addition, the Teflon film may be composed of at least one of a Fluorinated Ethylene Propylene (FEP) film and a PerFluoroAlkoxy (PFA) film.

The present invention can effectively increase the release force by measuring the adhesive force in real time by installing the adhesive force measuring means on the production platform and measuring the adhesive force compared to the cross-sectional area formed for each layer.

In addition, the present invention can ensure the stability of the product by guiding the user to the correct time to replace the parts by measuring the adhesive force in real time.

In addition, the present invention can effectively extend the life of the film by solving the local damage to the film by means of measuring the adhesive force.

In addition, the present invention can improve market competitiveness by minimizing the consumption of materials by immediately stopping the operation when a manufacturing failure occurs.

The effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a schematic diagram of a 3D printing system according to an embodiment of the present invention.
2 is an exemplary view showing the rear side of the 3D printer according to an embodiment of the present invention.
3 is an exemplary diagram illustrating a method of driving a 3D printer according to an embodiment of the present invention.
4 is a block diagram of a 3D printer according to another embodiment of the present invention.
5 is an exemplary diagram illustrating a method of driving a 3D printer according to another embodiment of the present invention.
6 is an exemplary view showing a graph comparing the adhesive strength of each component of the release agent.

Advantages of the invention, and methods of achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are exemplary, and thus the present invention is not limited to the illustrated matters. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. When 'including', 'having', 'consisting', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in a singular, the case in which the plural is included is included unless otherwise explicitly stated.

In interpreting the components, it is interpreted as including an error range even if there is no separate explicit description.

Each feature of the various embodiments of the present invention may be partially or wholly combined or combined with each other, and technically various interlocking and driving are possible, as will be fully understood by those skilled in the art, and each embodiment may be independently implemented with respect to each other, It may be possible to implement together in a related relationship.

Hereinafter, a 3D printer according to an embodiment of the present invention will be described with reference to FIG. 1 .

1 is a block diagram of a 3D printer according to an embodiment of the present invention. 1 shows only the linear actuator 110 and the resin tank 140 of the 3D printer 100 for convenience. It can be seen that the components configured in the 3D printer 100 are disposed in the case as shown in FIG. 2 and fixed to the lower surface of the case.

The 3D printer 100 is a bottom-up type printer that forms and stacks a structure (or 3D output) layer by layer while transporting a fabrication platform to which the material is attached upward. Here, the material is preferably interpreted to mean a state in which a photocurable resin to be described later is cured by a laser beam (or may be ultraviolet or visible light). In the present invention, the 3D printer 100 is a 3D printer of a photopolymerization method (Vat Photopolymerization). For example, the 3D printer of the present invention is applicable to the DLP method, Formlabs' Form series and SLA method.

The 3D printer 100 may be connected to the adhesion detection device 900 through a communication network. In the present invention, the adhesive force detection device 900 will be described on the assumption that it operates as a kind of server device. In the present specification, the communication network may be wireless or wired, and may include servers, routers, switches, wireless receivers and transmitters, and the like, as well as electrically conductive cables or optical cables. The communication network may include a local area network (LAN), a wide area network (WAN), or other cloud networks.

The adhesive force detection device 900 is configured to receive information on the adhesive state and adhesive force between the film 150 and the material to monitor the adhesive force between the film 150 and the material in real time.

The 3D printer 100 is a resin tank 140 for accommodating a photocurable resin, a photocurable resin (hereinafter, “photocurable material” or “resin material”) disposed on the upper end of the resin tank 140 and accommodated in the resin tank 140 . A light source unit irradiating a laser beam from the lower part of the base, located in the photocurable resin accommodated in the resin tank 140, and a fabrication platform 130 on which a material (Liquid Photopolymer) is fixed, the fabrication platform 130 Z A linear actuator 110 for moving in the axial direction, a servomotor 114 for controlling the movement of the linear actuator 110, and an adhesive force measuring means 122 extending from one area of the linear actuator 110 and measuring the adhesive force. do.

A liquid photo-curing resin is accommodated in the resin tank 140 . The photocurable resin serves to harden the next material layer according to the movement of the material fixed to the production platform 130 . Specifically, the resin tank 140 is composed of a light transmitting member (a transparent plate 150 to be described later) and a wall formed along the upper edge of the member. At this time, the wall is composed of a slope, and one side of the wall is characterized in that it is formed at a lower height than the other side of the wall so that the accommodated photocurable resin can be observed.

In addition, as shown in Figure 2, it is characterized in that the local damage resolving means (160, 170) is arranged on the side of the wall disposed in a position close to the linear actuator (110). Here, the local damage resolution means is operated based on the adhesive force and serves to relieve the adhesive force between the manufacturing platform 130 and the member. A detailed operation related thereto will be described later.

The photocurable resin is basically filled with a certain amount at the bottom regardless of the height of the structure to be manufactured. Here, the photocurable resin may be implemented as an acrylic or epoxy-based photocurable resin that responds to light, but the embodiment is not limited thereto.

A transparent plate is formed under the resin tank 140 . The transparent plate is characterized in that the optically transparent release agent is applied to prevent the material fixed to the production platform 130 , which will be described later, from being attached to the resin tank 140 .

On one side of the resin tank 140 , local damage resolution means 160 and 170 made of a rack and a pinion are formed. The rack is moved left and right by the pinion.

The resin tank 140 may be formed in a rectangular or circular shape, or may be formed in a capsule shape. This will be described later.

The transparent plate 150 (hereinafter, also referred to as “a member capable of transmitting light” or “film”) is formed to correspond to the shape of the resin tank 140 , is coated on the plate and the plate, and is optically transparent so that light can be transmitted It is carried out in a form in which the film is mixed. Here, the transparent film 150 may be a Teflon film, PDMS (PolyDiMethylSiloxane), or the like. Here, the Teflon film may be FEP (Fluorinated Ethylene Propylene) or PFA (PerFluoroAlkoxy). Accordingly, the embodiment is not limited, and may be a transparent plate by itself, such as a glass plate or an acrylic plate.

The adhesive force measuring means 122 is a sensor for measuring the applied force (tensile or compression) per unit area, and measures the load applied to the manufacturing platform (Platform, 130). When the adhesive force measuring means 122 detects a weight greater than a certain amount while measuring the load applied to the manufacturing platform 130 , the adhesive force can be more easily resolved through the movement of the resin tank 140 . Details related to this will be described later. Meanwhile, in the present specification, the adhesive force measuring means 122 may be referred to as a load cell.

The adhesive force measuring means 122 is disposed on the recessed side of the linear actuator 110 provided with a Z-axis ball screw 112 to be transferred in the Z-axis direction.

The linear actuator 110 extends in a direction parallel to the vertical direction, and a servo motor 114 is disposed at an upper end thereof. In this case, the motor for controlling the movement of the linear actuator 110 is not limited thereto, and for example, a step motor may be used.

One side of the linear actuator 110 is formed to be flat and the other side is formed to have a recessed shape. On the side where the linear actuator 110 is recessed, a ball screw 112 is arranged parallel to the longitudinal direction of the linear actuator 110, and a screw line is formed on the edge of the ball screw 112, so that the adhesive force fixed to the ball screw 112 The measuring means 122 helps to transfer in the vertical direction.

Specifically, in the ball screw 112 , a block 113 moving in the vertical direction according to the movement of the spiral of the ball screw is formed and fixed to correspond to the recessed shape of the linear actuator 110 . At this time, the support 121 is fixed to one surface of the block 113 by at least four screws. The support 121 is configured to support the adhesive force measuring means 122 fixed to the opposite side to the surface fixed to the block 113 . The adhesive force measuring means 122 may be fixed to the opposite side of the support 121 by screws.

The adhesive force measuring means 122 may be formed in a 'L' shape, but the shape is not limited thereto. The adhesive force measuring means 122 is formed in a direction perpendicular to the direction in which the support 121 is formed.

A fixing part 123 for fixing the adhesive force measuring means 122 and the manufacturing platform 130 to be described later is disposed at the lower end of the adhesive force measuring means 122 . The fixing part 123 has been described as being formed in the shape of a weight, but the shape is not limited thereto, and may be formed in various shapes.

Hereinafter, an operation of the 3D printer 100 according to an embodiment of the present invention will be described.

2 is an exemplary view showing the rear side of the 3D printer according to an embodiment of the present invention. 3 is an exemplary diagram illustrating a method of driving a 3D printer according to an embodiment of the present invention. The 3D printer of the present invention is configured in a case as shown in FIG. 2 and is briefly illustrated for convenience of description.

Referring to FIG. 3 , the adhesive force measuring means 122 is transferred in the Z-axis direction by the block 113 fixed to one area of the linear actuator 110 .

The block 113 is fastened to the ball screw 112 provided on the base 111 of the linear actuator 110 , and the block 113 moves in the Z-axis direction by the movement of a screw thread surrounding the ball screw 112 . The adhesive force measuring means 122 fixed in a direction perpendicular to the support 121 fixed to the block 113 moves in the Z-axis direction in response to the movement of the block 113 .

The manufacturing platform 130 is fixed to the lower surface of the adhesive force measuring means 122 , and structures to be manufactured are stacked one by one on the lower surface of the manufacturing platform 130 according to the movement of the linear actuator 110 . At this time, on the production platform 130 , the liquid photocurable resin is photopolymerized by the laser beam irradiated from the bottom (photopolymerizaion, hereinafter also referred to as deterioration reaction), and the cured solid material is laminated layer by layer.

At the moment when a photopolymerization reaction occurs on the material by the laser beam irradiated according to the shape of the structure to be manufactured, adhesion occurs between the resin tank 140 and the material, and between the resin tank 140 and the material to stack the next layers. As the adhesive is peeled off, the adhesive is re-created with the next layer of material and the resin bath 140 . That is, the desorption (脫着) is repeatedly made between the resin tank 140 and the material.

The adhesive force measuring means 122 measures the adhesive force between the resin tank 140 and the material in real time while the material is repeatedly detached by the photopolymerization reaction.

Since the 3D printer 100 of the present invention is a printer that operates in a bottom-up manner, the adhesive force (platform-material) between the production platform 130 and the material in order to produce a structure so that cracks do not occur in the structure (platform-material) is a material and a resin tank. It should be maintained to have a value greater than the adhesion force (material-resin) between (140). In this case, the adhesive force between the fabrication platform 130 and the material is determined in the initial process of fabricating the structure, and is based on having a constant value in the entire process.

Accordingly, the adhesive force measuring means 122 measures the adhesive force in real time and transmits a value for the adhesive force to the adhesive force detecting device 900 . At this time, the adhesive force measuring means 122 is based on measuring the adhesive force between the resin tank 140 and the material on a layer-by-layer basis whenever each layer is stacked, but the measurement interval (or unit) can be changed in design as needed Do.

The adhesive force detection device 900 that receives the value of the adhesive force between the resin tank 140 and the material at regular intervals compares the change in the value of the adhesive force and controls the operation of the resin tank 140 based on the adhesive force. . This will be described later.

On the other hand, in the present invention, when the value for the adhesive force measured by the adhesive force measuring means 122 gradually increases (when a certain weight is detected by the adhesive force measuring means 122 as the next material layer is laminated), the film ( 150) is considered to be a problem. Specifically, the case where a problem occurs in the film 150 may include a case in which the function of adhesion is lost due to abrasion of the film 150 and a case in which a sagging phenomenon of the film 150 occurs due to a deterioration reaction.

After checking the adhesion state between the resin tank 140 and the material based on the adhesive force measured by the adhesive force measuring means 122, if it is determined that a problem has occurred in the film 150, through the movement of the resin tank 140 This makes it easier to release the adhesive force. In other words, when the adhesive force is greater than a predetermined value, the adhesive force measuring means 122 uses the local damage resolving means 160 and 170 and the manufacturing platform 130 uses the other area of the member 150 to form the structure. The resin tank 140 is moved to manufacture.

For example, when the build platform 130 is raised to fabricate the next layer of material, unnecessary adhesion may occur between the film and the material attached to the bottom of the build platform 130, so in this case the resin tank 140 ) can extend the life of the film by shaking it in one or both directions. That is, the adhesive force between the film 150 and the material can be more easily resolved by reciprocating in the horizontal direction using the local damage resolving means 160 and 170 attached to one side of the rectangular resin tank 140 .

Specifically, the 3D printer 100 provided with the rectangular resin tank 140 forms a structure only in a partial area of the resin tank 140 . If only the right side of the resin tank 140 is continuously used as shown in FIG. 3 ( a ), abrasion or sagging of the above-described film 150 may occur. Accordingly, when the wear area WA is formed on the right side of the film 150 provided in the resin tank 140, the adhesive force detection device 900 is a local damage relief means attached to one side of the resin tank 140 ( 160 and 170) to move the resin tank 140 in the horizontal direction by controlling the operation.

Referring to FIG. 3 (b), when the resin tank 140 is moved in a straight direction by the adhesive force detecting device 900, the structure attached to the production platform 130 is formed in the left area of the resin tank 140 ( That is, it is manufactured using the area excluding the wear area WA on the right side.

In the 3D printer 100 according to an embodiment of the present invention, the process (b) in FIG. 3 (a) may be performed at least once, and may be repeated two or more times depending on the adhesion state of the film.

Therefore, the 3D printer 100 according to an embodiment of the present invention moves the resin tank 140 and alternately uses the other side of the film, so that while the curing heat generated on one side of the first used film cools down, By repeating the process using the other side, it is possible to prevent the continuous accumulation of curing heat on one side of the film. Accordingly, there is an effect that can effectively extend the life of the film.

In the conventional 3D printer, as the laser beam is continuously irradiated by the light source located at the bottom of the resin tank, heat is continuously applied to the film coated with the release agent provided on the lower surface of the resin tank, causing the film to wrinkle (or sag). There was a problem with the ulibuli phenomenon.

In addition, as the photocurable resin accommodated in the resin tank is cured by photopolymerization, adhesion is generated between the film and the material (the state in which the photocurable resin is cured) disposed on the lower surface of the resin tank. However, in the process of stacking the next layers, desorption is repeatedly performed between the film and the material. Accordingly, when it is determined that the function of the film is lost because the film is worn, the film should be replaced at an appropriate time, but there is a difficulty for users to determine an appropriate film replacement time. In other words, since the film provided in the resin tank has an optically transparent characteristic, users using a conventional 3D printer had difficulty in determining whether the film was worn.

In other words, in the conventional bottom-up 3D printer, the adhesive force measuring means (eg, the load cell of the present invention) for measuring the adhesive force between the film and the material and the local damage resolving means (eg, the present invention) for resolving the local damage to the film There was no configuration that simultaneously provided means for resolving local damage of Therefore, there are many cases where the 3D output is damaged or the quality of the output is remarkably deteriorated due to local damage to the film, making it difficult to commercialize (eg, manufacture a dental appliance).

On the other hand, the 3D printer according to an embodiment of the present invention is provided with a load cell as an adhesive force measuring means and a local damage resolving means as a local damage resolving means, thereby preventing damage and quality deterioration of the 3D output.

In addition, it is possible to effectively extend the life of the film because it resolves the local damage only when absolutely necessary by the adhesive force measuring means.

The 3D printer 100 according to an embodiment of the present invention attaches a load cell 122 to the top of the production platform 130 to measure the adhesive force between the resin tank 140 and the material in real time, thereby effectively measuring the release force of the product. can be increased

In addition, by measuring the adhesive force in real time, it is possible to ensure the stability of the product by guiding the user to the correct time to replace the parts.

Hereinafter, the 3D printer 400 and operation according to an embodiment of the present invention will be described with reference to FIGS. 4 to 5 .

4 is a block diagram of a 3D printer according to another embodiment of the present invention. 5 is an exemplary diagram illustrating a method of driving a 3D printer according to another embodiment of the present invention. The 3D printer 400 shown in Figs. 4 to 5 is different from the 3D printer 100 shown in Figs. 1 to 3 only in the form of the resin tank 440 and the manufacturing platform 430 provided in Figs. Since they are substantially the same, duplicate descriptions will be omitted.

4, the 3D printer 400 is a linear actuator 110 for transporting the production platform 430 in the Z-axis direction, the block 113 of the linear actuator 110 is fixed to the extended support 121 and It includes an adhesive force measuring means 122 formed in a vertical direction, a circular production platform 430 fixed to the lower surface of the adhesive force measuring means 122 , and a circular resin tank 440 for the production platform 430 .

On the outer surface of the resin tank 440, local damage relief means 460 and 470 are formed along the edge. Local damage resolving means (460, 470) is a configuration for moving the resin tank 440 based on the adhesive force measured by the adhesive force measuring means 122 like the above-described local damage resolving means (160, 170), the resin The water tank 440 may be rotated in one direction.

Referring to FIG. 4 , the 3D printer 400 according to another embodiment of the present invention has local damage resolving means 460 and 470 at one end of the edge of the resin water tank 140 , including a rack and a pinion. ) is formed. The rack is moved clockwise/counterclockwise by the pinion.

As the 3D printer 400 according to another embodiment of the present invention includes the resin tank 440 having a circular shape, the film 450 formed on the lower surface of the resin tank 440 also has a circular shape. At this time, the cross-sectional area of the manufacturing platform 430 located at the lower end of the adhesive force measuring means 122 is formed to have a circular shape.

When the resin tank 440 is manufactured in a circular shape, it is advantageous when manufacturing a structure in which the boundary of the corner is curved. That is, as the amount of the liquid photocurable resin accommodated in the resin tank 440 is increased, the efficiency in manufacturing the structure may be increased.

In addition, when the cross-sectional area of the manufacturing platform 430 is formed in a circular shape on the circular resin tank 440 , the used area of the film 450 provided at the lower end of the resin tank 440 may be increased. In other words, since a structure with a curved edge can be used by maximizing the cross-sectional area of the production platform 430 , the laser beam irradiated by the laser light source is the cross-sectional area of the film 450 formed at a position corresponding to the production platform 430 can be used to its fullest extent.

Accordingly, since the used area compared to the cross-sectional area of the film 450 can be increased, there is an effect of maximizing the efficiency when manufacturing the structure.

In addition, the 3D printer 400 according to another embodiment of the present invention uses the local damage resolving means 460 and 470 attached to the resin tank 440 based on the adhesive force measured by the adhesive force measuring means 122 . The practicality of the product can be maximized by effectively using the entire area of the film 450 provided in the resin tank 440 .

In addition, by measuring the adhesive force in real time using the adhesive force measuring means 122 to measure the adhesive force compared to the cross-sectional area formed for each layer, the release force of the product can be effectively increased.

6 is an exemplary view showing a graph comparing the adhesive strength of each component of the release agent.

Referring to FIG. 6 , when the release agent is a Teflon film, it has an adhesive ^{force of about 0.01 kg/cm 2 per 0.1 sec.} In the case of the PDMS film, it has an adhesive ^{force of about 0.5 kg/cm 2 per 0.1 sec.} When the release agent is glass itself, it has an adhesive strength of about ^{0.5 kg/cm 2 per 0.1 sec.} In the case of acrylic, it has an adhesive strength of about ^{1 kg/cm 2 per 1 sec.}

Therefore, it can be seen that the release agent has a lower release time and adhesive force compared to a Teflon film and PDMS having a low surface energy, compared to acryl and glass having a high surface energy. That is, it is preferable to use a Teflon film and PDMS as the release agent.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made within the scope without departing from the technical spirit of the present invention. . Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: 3D printer 110: linear actuator
111: base 112: ball screw
113: block 114: servomotor
121a: support surface 121b: support shaft
122: adhesive force measuring means 123: fixing part
130: build platform 140: resin tank
150: film 160, 170: rack

Claims (9)

a linear actuator, a manufacturing platform moving in the vertical direction in the linear actuator, and an adhesive force measuring means disposed on the upper end of the manufacturing platform and measuring the adhesive force applied to the manufacturing platform; And in the 3D printer comprising a resin tank accommodating a photocurable resin molded into a structure by the production platform,
The resin tank,
a member capable of transmitting light; and
a wall formed along the upper edge of the member; but, one side of the wall is formed at a height lower than the other side of the wall so that the accommodated photocurable resin can be observed, and one of the walls is close to the linear actuator A photopolymerization type 3D printer capable of real-time adhesive force measurement, in which a local damage relief means for resolving the adhesive force between the production platform and the member is disposed on the side surface based on the adhesive force. According to claim 1,
A photopolymerization type 3D printer capable of real-time adhesive force measurement, further comprising a light source unit for photocuring the photocurable resin by irradiating a laser beam to the lower portion of the resin tank to be laminated layer by layer on the lower surface of the production platform. 3. The method of claim 2,
The adhesive force measuring means,
A photopolymerization type 3D printer capable of real-time adhesive force measurement, which measures the adhesion by comparing the adhesion degree between the resin tank and the photocurable resin before and after the photopolymerization of the photocurable resin by the laser beam . According to claim 1,
Receiving information on the adhesive force measured using the adhesive force measuring means, and further comprising an adhesion detection device for controlling the movement of the resin tank based on the received adhesion force, real-time adhesive force measurement is possible 3D light polymerization method printer. According to claim 1,
The resin tank is formed in any one of a square, rectangular, and circular shape, a light-curing 3D printer capable of real-time adhesive force measurement. According to claim 1,
The resin tank moves in any one of a linear direction, a clockwise direction, and a counterclockwise direction by the local damage resolution means, a light polymerization type 3D printer capable of real-time adhesive force measurement. According to claim 1,
When the adhesive force is greater than a predetermined value, the adhesive force measuring means moves the resin tank so that the fabrication platform uses the other area of the member to fabricate the structure using the local damage resolution means, real-time adhesive force measurement A 3D printer with a light-curing method that can do this. According to claim 1,
The member is a release film comprising a Teflon film and PDMS (PolyDiMethylSiloxane), a photopolymerization type 3D printer capable of real-time adhesive force measurement. 9. The method of claim 8,
The Teflon film is composed of at least one of a Fluorinated Ethylene Propylene (FEP) film and a PerFluoroAlkoxy (PFA) film, a photopolymerization type 3D printer capable of real-time adhesive force measurement.

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