WO2019207387A1 - Printing device for the additive manufacture of an object in three dimensions by successive polymerization of layers of resin - Google Patents

Printing device for the additive manufacture of an object in three dimensions by successive polymerization of layers of resin Download PDF

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Publication number
WO2019207387A1
WO2019207387A1 PCT/IB2019/052813 IB2019052813W WO2019207387A1 WO 2019207387 A1 WO2019207387 A1 WO 2019207387A1 IB 2019052813 W IB2019052813 W IB 2019052813W WO 2019207387 A1 WO2019207387 A1 WO 2019207387A1
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WO
WIPO (PCT)
Prior art keywords
resin
optical source
distance
vertical
printing device
Prior art date
Application number
PCT/IB2019/052813
Other languages
French (fr)
Inventor
Chandra YERRA
Guillaume SCHODER
Original Assignee
Craft Factory
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Publication date
Application filed by Craft Factory filed Critical Craft Factory
Publication of WO2019207387A1 publication Critical patent/WO2019207387A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
    • B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified

Definitions

  • Printing device for the additive manufacturing of three-dimensional objects by successive polymerization of resin layers !.
  • the invention lies in the technical field of 3D printing and more particularly printing in three dimensions of precision for the realization of medical objects in three dimensions such as in particular for the realization of dental prostheses
  • the printing device can also be used for the manufacture of any other object, in the medical field or otherwise, requiring high precision and / or a high level of finish.
  • Also known devices for the implementation of this technique including there are devices with a supporting structure to both receive a platform containing the resin and support the light source and as the platform moves vertically at each cycle, that is to say, each new solidified layer of resin corresponding to a slice of the object. More specifically, after each solidified layer, the platform descends a fixed height to cover the solidified layer with a new layer of liquid resin. This fixed height substantially corresponds to the thickness of each layer, however, it is possible that the height of the added resin layer, generated by the displacement of the platform, does not correspond precisely to the size of the slice of the object.
  • This shift is problematic for several reasons and in particular by the fact that it can lead to polymerization of the imperfect or non-homogeneous resin if the shift is important, or generated a precision of the insufficient slice. This problem is even more important if the offset is cumulative to each slice.
  • the offset may be due to numerous other causes including a lack of rigidity of the supporting structure, vibration, wear of parts, the verticality of the platform or the quality of resin in the tank or a change in viscosity of the resin.
  • the resin is distributed in several work areas or tanks, and the level of the resin is not always the same in each tray causing further problems of different liquid resin layer heights and especially a distance between the optical source and the upper layer of non-constant liquid resin between the tanks.
  • the present invention relates to a printing device for the additive manufacturing of three-dimensional object by successive polymerization of resin layers
  • a printing device for the additive manufacturing of three-dimensional object by successive polymerization of resin layers comprising a support structure for receiving a platform for manufacturing the object in three dimensions. and receiving an optical source, said platform, allowing the object to be supported in a resin container, being movable in vertical translation at each addition of a layer according to a fixed height and such that, according to the invention, the device comprises in addition :
  • a first object of the present invention is to solve all or part of the technical problems related to the aforementioned prior art.
  • Another object of the present invention is to provide a printing device for obtaining a constant distance between the optical source and the upper liquid layer of resin.
  • Another object of the present invention is to provide a printing device for precise positioning of the blade or scraper blade of the resin.
  • Another object of the present invention is to provide a device for printing objects in three dimensions having a structure for moving the optical source in the vertical and horizontal planes.
  • Another object of the present invention is to provide a printing device for adding resin between two cycles.
  • Another object of the present invention is to provide a printing device with a reliable structure for producing objects in three dimensions with a high accuracy especially less than 50pm and up to 10pm.
  • FIG. 1 represents an exemplary embodiment in perspective of a first printing device according to the invention
  • FIG. 2 is a perspective view of a second printing device according to the invention.
  • FIG. 3 represents a simplified schematic view of a printing device according to the embodiment of FIG. 1.
  • the present invention aims to protect a printing device 1 for the additive manufacture of object 2 in three dimensions by successive polymerization of resin layers.
  • the printing device 1 comprises a support structure 4 for receiving a platform 5 for manufacturing the object in three dimensions.
  • This support structure 4 also allows the reception of an optical source 6.
  • said platform 5 for supporting the tray 7 of resin is movable in vertical translation. In this way, at each addition of layer 3 (that is to say after polymerization of the previous layer 3 according to the pattern) the platform 5 is moved at a fixed height Hc (layer height) to reveal a new layer. liquid resin.
  • the printing device 1 further comprises measuring means 8 for the distance between the optical source and the surface 9 of the resin in the tray 7.
  • these measuring means 8 of the distance comprise a distance sensor 10 at a constant distance with the optical source 6, the sensor 10 for measuring the distance between itself and the surface 9 of the upper layer of resin.
  • the measuring means 8 of the distance comprise a distance sensor 10 at a constant distance with the platform 5 for measuring the distance between itself and the surface 9 of the upper layer of resin.
  • the senor 10 regardless of the positioning mode of the sensor 10, will be made from a laser to obtain a significant accuracy.
  • other types of sensor 10 known to those skilled in the art could also be envisaged including Doppler type sensors and especially ultrasound.
  • the measuring means 8 comprise only one sensor 10. However, as an alternative embodiment, the measuring means 8 may comprise at least two measurement sensors 10.
  • Means of measurement comprising several sensors 10 are particularly interesting in the following two cases:
  • the sensors are each associated with a working area, which allows the distance of the optical source to be adapted to each tray 7, that is to say to each working area, the levels of resin in the tanks 7 are not necessarily identical to each other.
  • the printing device 1 further comprises vertical adjustment means 1 1 and horizontal 12 of the optical source 6.
  • These vertical adjustment means 1 1 and horizontal 12 are arranged on the support structure 4. These adjustment means January 1 and 12 adjust the position of the optical source 6, depending on the values measured by said means of measure 8 to obtain a constant distance between the optical source and the upper level of the resin,
  • the printing device 1 comprises control means 13 of the displacement of the vertical adjustment means 1 1 and horizontal to deliver a displacement control of the vertical adjustment means 1 1 and horizontal 12.
  • control means 13 are located in the exemplary embodiment at the level of the measuring means 8 but could also be deported in a conventional manner to another part of the printing device 1
  • control means 13 are actuated after each addition of layer 3 or after each change of working area by the optical source 6.
  • the vertical adjustment means 1 1 and horizontal 12 of the optical source 6 comprise an optical module 14 carrying the optical source 6.
  • This optical module 14 is connected to the upper part 15 of the support structure 4 by at least one vertical guide rail 16 and also comprises first motorized means 17 for vertically driving the optical module 15 along said vertical guide rail 16.
  • the optical module 14 further comprises at least one horizontal guide rail 18 and second motorized means 19, the assembly allowing the optical source 6 to move horizontally with respect to the base of the optical module 14.
  • the printing device 1 further comprises a wiper 20 secured to the optical module 14.
  • a wiper 20 secured to the optical module 14. This feature is interesting because it allows a simultaneous and identical vertical movement of the optical source and the blade of the blade 20. The latter is always well positioned relative to the surface 9 of the resin to be scanned.
  • FIG. 3 showing a schematic example of the printing device, it includes the operation of the printing device 1.
  • the goal is to keep the distance HT (working height) fixed at the time of actuation of the optical source 6 so as optimally polymerize the liquid resin layer.
  • the platform 5 descends a height HC (layer height) so as to cover the object with a new layer of liquid resin which will be used to manufacture the next layer of the object 2. During the descent, it is the whole of the support structure 4 which goes down so that the optical module 14 also descends from a height HC.
  • the distance HM measured height
  • HR actual height
  • the sensor 10 corresponding to this working area is actuated so as to have the optical source 6 at the working height HT relative to the surface of the resin 9 in the corresponding tray 7 if there is passage to a new tray. If it is the same tray 7, it is advantageous to perform the measurement again to avoid any shift caused by the displacement of the optical source 6.
  • the printing device 1 actuates the blade 20, the latter being disposed at a fixed distance from the optical source 6 is placed optimally relative to the surface of the resin 9 thanks to the vertical adjustment phase.
  • the sensor 10 is fixed relative to the platform 5, this being operation of this alternative is quite similar to the first embodiment, except that the height between the surface of the resin 9 and the optical source is deduced from the height between the optical source 6 and the platform on the one hand and the height between the sensor 10 and the surface 9, measured by the sensor 9 on the other hand.
  • the actual height deduced HR between the optical source 6 and the surface 9 is also compared to the working height HT to control a displacement by the vertical adjustment means 11 in case of offset.
  • the printing device 1 as mentioned above makes it possible to perfectly position the optical source 6 with respect to the surface of the resin 9 so that the focusing of the optical source corresponds exactly to the distance with the surface of the resin.
  • the printing device 1 therefore makes it possible to correct the existing offsets in the devices of the state of the art and makes it possible to carry out a stereolithography of great precision and in particular of the order of 50 ⁇ m and up to 10 pm
  • the printing device thus makes it possible to manufacture three-dimensional objects requiring very precise production details and in particular medical objects such as dental prostheses.

Abstract

The invention relates to a printing device having a support structure for receiving a platform for manufacturing the object and for receiving an optical source, said platform, for supporting the object in a tank of resin, being movable vertically in translation upon each addition of a layer by a set height, the device also comprising means for measuring the distance between the optical source and the surface of the resin in the tank, vertical and horizontal adjustment means, disposed on the support structure, for the position of the optical source depending on the values measured by said measurement means so as to obtain a constant distance between the optical source and the surface of the resin, control means for the movement of the vertical and horizontal adjustment means in order to deliver a command for moving the vertical and horizontal adjustment means.

Description

Dispositif d’impression pour la fabrication additive d’objet en trois dimensions par polymérisation successive de couches de résine!. Printing device for the additive manufacturing of three-dimensional objects by successive polymerization of resin layers !.
Domaine technique Technical area
[0001 ] L’invention se situe dans le domaine technique de l’impression 3D et plus particulièrement de l’impression en trois dimensions de précision permettant la réalisation d’objet médicaux en trois dimensions tels que notamment pour la réalisation de prothèses dentaires The invention lies in the technical field of 3D printing and more particularly printing in three dimensions of precision for the realization of medical objects in three dimensions such as in particular for the realization of dental prostheses
[0002] Cette application n’est toutefois pas limitative et le dispositif d’impression pourra également être utilisé pour la fabrication de tout autre objet, dans le domaine médical ou autre, nécessitant une grande précision et/un niveau élevé de finition.  However, this application is not limiting and the printing device can also be used for the manufacture of any other object, in the medical field or otherwise, requiring high precision and / or a high level of finish.
Technique antérieure Prior art
[0003] On connaît à ce jour une technique d’impression par ajout de couche successive de résine, chaque couche polymérisée, selon le motif souhaité, par une source optique de type laser. Cette technique est notamment connue sous le nom de SLA pour « appareil stéréolithographie ». Cette technique d’impression permet de réaliser des objets avec une bonne précision et relativement rapidement. Known to date a printing technique by adding successive layer of resin, each polymerized layer, according to the desired pattern, by a laser-type optical source. This technique is known in particular as SLA for "stereolithography apparatus". This printing technique makes it possible to produce objects with good accuracy and relatively quickly.
[0004] On connaît également des dispositifs permettant la mise en œuvre de cette technique, notamment il existe des dispositifs avec une structure porteuse permettant à la fois de réceptionner une plateforme contenant la résine et de supporter la source lumineuse et tel que la plateforme se déplace verticalement à chaque cycle, c’est-à-dire à chaque nouvelle couche solidifiée de résine correspondant à une tranche de l’objet. Plus précisément, après chaque couche solidifiée, la plateforme descend d’une hauteur fixe permettant de recouvrir la couche solidifiée par une nouvelle couche de résine liquide. [0005] Cette hauteur fixe correspond sensiblement à l’épaisseur de chaque couche, toutefois, il est possible que la hauteur de la couche de résine ajoutée, engendrée par le déplacement de la plateforme, ne corresponde pas précisément à la dimension de la tranche de l’objet. Also known devices for the implementation of this technique, including there are devices with a supporting structure to both receive a platform containing the resin and support the light source and as the platform moves vertically at each cycle, that is to say, each new solidified layer of resin corresponding to a slice of the object. More specifically, after each solidified layer, the platform descends a fixed height to cover the solidified layer with a new layer of liquid resin. This fixed height substantially corresponds to the thickness of each layer, however, it is possible that the height of the added resin layer, generated by the displacement of the platform, does not correspond precisely to the size of the slice of the object.
[0006] Ce décalage est problématique pour plusieurs raisons et notamment par le fait qu’il peut entraîner une polymérisation de la résine imparfaite ou non homogène si le décalage est important, ou encore engendrée une précision de la tranche insuffisante. Ce problème est d’autant plus important si le décalage se cumule à chaque tranche.  This shift is problematic for several reasons and in particular by the fact that it can lead to polymerization of the imperfect or non-homogeneous resin if the shift is important, or generated a precision of the insufficient slice. This problem is even more important if the offset is cumulative to each slice.
[0007] Pour corriger ce décalage, il est possible d’améliorer la précision du déplacement de la plateforme en utilisant des assemblages plus précis, toutefois cette solution est insuffisante car le décalage peut être dû à de nombreuse autres causes et notamment à un manque de rigidité de la structure porteuse, à des vibrations, à l’usure des pièces, à la verticalité de la plateforme ou encore à la qualité de résine dans le bac ou un changement de viscosité de la résine. De plus dans certaines applications, la résine est distribuée dans plusieurs zones de travail ou bacs, et le niveau de la résine n’est pas toujours le même dans chaque bac engendrant la encore des problèmes de hauteurs de couche de résine liquide différentes et surtout une distance entre la source optique et la couche supérieure de résine liquide non constante entre les bacs.  To correct this discrepancy, it is possible to improve the accuracy of the displacement of the platform using more precise assemblies, however this solution is insufficient because the offset may be due to numerous other causes including a lack of rigidity of the supporting structure, vibration, wear of parts, the verticality of the platform or the quality of resin in the tank or a change in viscosity of the resin. In addition, in some applications, the resin is distributed in several work areas or tanks, and the level of the resin is not always the same in each tray causing further problems of different liquid resin layer heights and especially a distance between the optical source and the upper layer of non-constant liquid resin between the tanks.
Résumé de l’invention Summary of the invention
[0008] La présente invention concerne un dispositif d’impression pour la fabrication additive d’objet en trois dimensions par polymérisation successive de couches de résine comportant une structure de support permettant la réception d’une plateforme de fabrication de l’objet en trois dimensions et la réception d’une source optique, ladite plateforme, permettant le support de l’objet dans un bac de résine, étant mobile en translation verticale à chaque ajout de couche selon une hauteur fixe et tel que, selon l’invention le dispositif comprend en outre : The present invention relates to a printing device for the additive manufacturing of three-dimensional object by successive polymerization of resin layers comprising a support structure for receiving a platform for manufacturing the object in three dimensions. and receiving an optical source, said platform, allowing the object to be supported in a resin container, being movable in vertical translation at each addition of a layer according to a fixed height and such that, according to the invention, the device comprises in addition :
- des moyens de mesure de la distance entre la source optique et la surface de la résine dans le bac, - des moyens d’ajustement verticaux et horizontaux de la position de la source optique, disposés sur la structure de support, en fonction des valeurs mesurées par lesdits moyens de mesure permettant d’obtenir une distance constante entre la source optique et la surface de la résine, means for measuring the distance between the optical source and the surface of the resin in the tank, vertical and horizontal adjustment means of the position of the optical source, arranged on the support structure, as a function of the values measured by said measuring means making it possible to obtain a constant distance between the optical source and the surface of the resin,
- des moyens de commande du déplacement des moyens d’ajustement verticaux et horizontaux pour délivrer une commande de déplacement des moyens d’ajustement verticaux et horizontaux. means for controlling the displacement of the vertical and horizontal adjustment means for delivering a displacement control of the vertical and horizontal adjustment means.
Avantages apportés Benefits brought
[0009] Un premier but de la présente invention est de résoudre tout ou partie des problèmes techniques liés à l’art antérieur précité. A first object of the present invention is to solve all or part of the technical problems related to the aforementioned prior art.
[0010] Un autre but de la présente invention est de proposer un dispositif d’impression permettant d’obtenir une distance constante entre la source optique et la couche supérieure liquide de résine. Another object of the present invention is to provide a printing device for obtaining a constant distance between the optical source and the upper liquid layer of resin.
[001 1 ] Un autre but de la présente invention est de proposer un dispositif d’impression permettant un positionnement précis du balai ou lame de raclage de la résine. [001 1] Another object of the present invention is to provide a printing device for precise positioning of the blade or scraper blade of the resin.
[0012] Un autre but de la présente invention est de proposer un dispositif d’impression d’objets en trois dimensions présentant une structure permettant le déplacement de la source optique dans les plans verticaux et horizontaux. Another object of the present invention is to provide a device for printing objects in three dimensions having a structure for moving the optical source in the vertical and horizontal planes.
[0013] Un autre but de la présente invention est de proposer un dispositif d’impression permettant un ajout de résine entre deux cycles. Another object of the present invention is to provide a printing device for adding resin between two cycles.
[0014] Un autre but de la présente invention est de proposer un dispositif d’impression avec une structure fiable permettant la réalisation d’objets en trois dimensions présentant une grande précision notamment inférieure à 50pm et jusqu’ à 10pm. Brève description des dessins Another object of the present invention is to provide a printing device with a reliable structure for producing objects in three dimensions with a high accuracy especially less than 50pm and up to 10pm. Brief description of the drawings
[0015] La présente invention sera mieux comprise à la lecture d’un exemple détaillé de réalisation en référence aux figures annexées, fournies à titre d’exemple non limitatif, parmi lesquels : The present invention will be better understood on reading a detailed embodiment with reference to the appended figures, provided by way of non-limiting example, among which:
[0016] La figure 1 représente un exemple de réalisation en perspective d’un premier dispositif d’impression conforme à l’invention,  FIG. 1 represents an exemplary embodiment in perspective of a first printing device according to the invention,
[0017] La figure 2 représente en vue en perspective d’un second dispositif d’impression conforme à l’invention,  FIG. 2 is a perspective view of a second printing device according to the invention,
[0018] La figure 3 représente une vue schématique simplifiée d’un dispositif d’impression selon l’exemple de réalisation de la figure 1.  FIG. 3 represents a simplified schematic view of a printing device according to the embodiment of FIG. 1.
Description des modes de réalisation Description of the embodiments
[0019] La présente invention vise à protéger un dispositif d’impression 1 pour la fabrication additive d’objet 2 en trois dimensions par polymérisation successive de couches de résine. The present invention aims to protect a printing device 1 for the additive manufacture of object 2 in three dimensions by successive polymerization of resin layers.
[0020] En se reportant aux figures 1 et 2 représentant deux modes de réalisation on voit que le dispositif d’impression 1 comporte une structure de support 4 permettant la réception d’une plateforme 5 de fabrication de l’objet en trois dimensions. Cette structure de support 4 permet en outre la réception d’une source optique 6.  Referring to Figures 1 and 2 showing two embodiments we see that the printing device 1 comprises a support structure 4 for receiving a platform 5 for manufacturing the object in three dimensions. This support structure 4 also allows the reception of an optical source 6.
[0021 ] Comme il est connu de l’état de la technique, ladite plateforme 5 permettant le support du bac 7 de résine est mobile en translation verticale. De cette manière à chaque ajout de couche 3 (c’est-à-dire après polymérisation de la couche 3 précédente selon le patron) la plateforme 5 est déplacée selon une hauteur fixe Hc (hauteur de couche) pour faire apparaître une nouvelle couche en résine liquide.  As is known from the state of the art, said platform 5 for supporting the tray 7 of resin is movable in vertical translation. In this way, at each addition of layer 3 (that is to say after polymerization of the previous layer 3 according to the pattern) the platform 5 is moved at a fixed height Hc (layer height) to reveal a new layer. liquid resin.
[0022] Selon un aspect important de l’invention, le dispositif d’impression 1 comprend en outre des moyens de mesure 8 de la distance entre la source optique et la surface 9 de la résine dans le bac 7. [0023] En se reportant à la figure 1 on voit que ces moyens de mesure 8 de la distance comportent un capteur de distance 10 à distance constante avec la source optique 6, le capteur 10 permettant de mesurer la distance entre lui-même et la surface 9 de la couche supérieure de résine. According to an important aspect of the invention, the printing device 1 further comprises measuring means 8 for the distance between the optical source and the surface 9 of the resin in the tray 7. Referring to Figure 1 we see that these measuring means 8 of the distance comprise a distance sensor 10 at a constant distance with the optical source 6, the sensor 10 for measuring the distance between itself and the surface 9 of the upper layer of resin.
[0024] En se reportant à la figure 2 représentant une alternative de réalisation, on voit que les moyens de mesure 8 de la distance comportent un capteur de distance 10 à distance constante avec la plateforme 5 permettant de mesurer la distance entre lui-même et la surface 9 de la couche supérieure de résine. Referring to Figure 2 showing an alternative embodiment, we see that the measuring means 8 of the distance comprise a distance sensor 10 at a constant distance with the platform 5 for measuring the distance between itself and the surface 9 of the upper layer of resin.
[0025] De manière avantageuse, le capteur 10, quel que soit le mode de positionnement du capteur 10, sera réalisé à partir d’un laser pour obtenir une précision importante. Toutefois d’autres types de capteur 10, connus de l’homme du métier pourraient également être envisagés et notamment des capteurs de type Doppler et notamment à ultrasons. Advantageously, the sensor 10, regardless of the positioning mode of the sensor 10, will be made from a laser to obtain a significant accuracy. However, other types of sensor 10, known to those skilled in the art could also be envisaged including Doppler type sensors and especially ultrasound.
[0026] Dans les exemples de réalisation des figures annexées, les moyens de mesure 8 ne comportent qu’un capteur 10. Toutefois en variante de réalisation, les moyens de mesure 8 pourront comportent au moins deux capteurs de mesure 10. In the exemplary embodiments of the appended figures, the measuring means 8 comprise only one sensor 10. However, as an alternative embodiment, the measuring means 8 may comprise at least two measurement sensors 10.
[0027] Des moyens de mesure comportant plusieurs capteurs 10 sont particulièrement intéressants dans les deux cas suivants : Means of measurement comprising several sensors 10 are particularly interesting in the following two cases:
- dans un premier cas, lorsque les capteurs permettent la mesure dans un bac 7, c’est-à-dire dans une zone de travail, permettant de vérifier si ce bac 7 est bien disposé dans l’axe horizontal, in a first case, when the sensors make it possible to measure in a tray 7, that is to say in a work zone, making it possible to check whether this tray 7 is well disposed in the horizontal axis,
- dans un second cas, lorsque les capteurs sont associés chacun à une zone de travail, ce qui permet une adaptation de la distance de la source optique à chaque bac 7 c’est-à-dire à chaque zone de travail, les niveaux de résine dans les bacs 7 n’étant pas nécessairement identiques entre eux. in a second case, when the sensors are each associated with a working area, which allows the distance of the optical source to be adapted to each tray 7, that is to say to each working area, the levels of resin in the tanks 7 are not necessarily identical to each other.
[0028] Il est à noter également que l’on prévoit avantageusement, pour vérifier le parallélisme entre la surface de la résine et l’axe horizontal soit un inclinomètre deux axes soit deux inclinomètres à un axe, ces inclinomètres permettant la calibration du dispositif 1 . [0029] Selon l’invention, le dispositif d’impression 1 comporte en outre des moyens d’ajustement verticaux 1 1 et horizontaux 12 de la source optique 6. It should also be noted that it is advantageously provided, to check the parallelism between the surface of the resin and the horizontal axis is a two-axis inclinometer or two inclinometers to an axis, these inclinometers for the calibration of the device 1 . According to the invention, the printing device 1 further comprises vertical adjustment means 1 1 and horizontal 12 of the optical source 6.
[0030] Ces moyens d’ajustement verticaux 1 1 et horizontaux 12 sont disposés sur la structure de support 4. Ces moyens d’ajustement 1 1 et 12 ajustent la position de la source optique 6, en fonction des valeurs mesurées par lesdits moyens de mesure 8 permettant d’obtenir une distance constante entre la source optique et le niveau supérieur de la résine, These vertical adjustment means 1 1 and horizontal 12 are arranged on the support structure 4. These adjustment means January 1 and 12 adjust the position of the optical source 6, depending on the values measured by said means of measure 8 to obtain a constant distance between the optical source and the upper level of the resin,
[0031 ] A cet effet le dispositif d’impression 1 comprend des moyens de commande 13 du déplacement des moyens d’ajustement verticaux 1 1 et horizontaux pour délivrer une commande de déplacement des moyens d’ajustement verticaux 1 1 et horizontaux 12. Ces moyens de commande 13 sont situés dans l’exemple de réalisation au niveau des moyens de mesure 8 mais pourraient également être déportés de manière classique sur une autre partie du dispositif d’impression 1 For this purpose the printing device 1 comprises control means 13 of the displacement of the vertical adjustment means 1 1 and horizontal to deliver a displacement control of the vertical adjustment means 1 1 and horizontal 12. These means 13 are located in the exemplary embodiment at the level of the measuring means 8 but could also be deported in a conventional manner to another part of the printing device 1
[0032] De manière avantageuse, les moyens de commande 13 sont actionnés après chaque ajout de couche 3 ou après chaque changement de zone de travail par la source optique 6. Advantageously, the control means 13 are actuated after each addition of layer 3 or after each change of working area by the optical source 6.
[0033] Comme représenté aux figures 1 et 2 les moyens d’ajustement verticaux 1 1 et horizontaux 12 de la source optique 6 comportent un module optique 14 portant la source optique 6. Ce module optique 14 est relié à la partie haute 15 de la structure de support 4 par au moins un rail de guidage vertical 16 et comprend également des premiers moyens motorisés 17 pour l’entraînement vertical du module optique 15 le long dudit rail de guidage vertical 16. As shown in Figures 1 and 2 the vertical adjustment means 1 1 and horizontal 12 of the optical source 6 comprise an optical module 14 carrying the optical source 6. This optical module 14 is connected to the upper part 15 of the support structure 4 by at least one vertical guide rail 16 and also comprises first motorized means 17 for vertically driving the optical module 15 along said vertical guide rail 16.
[0034] Le module optique 14 comprend en outre au moins un rail de guidage horizontal 18 et des seconds moyens motorisés 19, l’ensemble permettant le déplacement horizontal de la source optique 6 par rapport à la base du module optique 14. The optical module 14 further comprises at least one horizontal guide rail 18 and second motorized means 19, the assembly allowing the optical source 6 to move horizontally with respect to the base of the optical module 14.
[0035] Dans le mode de réalisation des figures 1 et 2, on retrouve deux rails de guidage vertical 16 et deux rails de guidage horizontal 18 permettant d’assurer une meilleure stabilité du module optique 14. In the embodiment of Figures 1 and 2, there are two vertical guide rails 16 and two horizontal guide rails 18 to ensure a better stability of the optical module 14.
[0036] De manière avantageuse, le dispositif d’impression 1 comprend en outre un balai 20 solidaire du module optique 14. Cette caractéristique est intéressante car elle permet un déplacement vertical simultané et identique de la source optique et de la lame du balai 20. Ce dernier est donc toujours bien positionné par rapport à la surface 9 de la résine à balayer. Advantageously, the printing device 1 further comprises a wiper 20 secured to the optical module 14. This feature is interesting because it allows a simultaneous and identical vertical movement of the optical source and the blade of the blade 20. The latter is always well positioned relative to the surface 9 of the resin to be scanned.
[0037] En se reportant cette fois à la figure 3 représentant un exemple schématique du dispositif d’impression, on comprend le fonctionnement du dispositif d’impression 1.  Referring now to Figure 3 showing a schematic example of the printing device, it includes the operation of the printing device 1.
[0038] Le but poursuivi est de garder la distance HT (hauteur de travail) fixe au moment de l’actionnement de la source optique 6 de manière à polymériser de manière optimale la couche de résine liquide. The goal is to keep the distance HT (working height) fixed at the time of actuation of the optical source 6 so as optimally polymerize the liquid resin layer.
[0039] Lorsqu’une couche 3 de l’objet 2 est réalisée, la plateforme 5 descend d’une hauteur HC (hauteur de couche) de manière à recouvrir l’objet d’une nouvelle couche de résine liquide qui va servir à fabriquer la couche suivant de l’objet 2. Lors de la descente, c’est l’ensemble de la structure de support 4 qui descend de sorte que le module optique 14 descend également d’une hauteur HC.  When a layer 3 of the object 2 is produced, the platform 5 descends a height HC (layer height) so as to cover the object with a new layer of liquid resin which will be used to manufacture the next layer of the object 2. During the descent, it is the whole of the support structure 4 which goes down so that the optical module 14 also descends from a height HC.
[0040] Une fois le déplacement de la plateforme 5 et du module optique réalisé, on vient mesurer la distance HM (hauteur mesurée) entre le capteur 10 et la surface 9 de la résine. Compte tenu de la distance fixe HC (hauteur capteur) entre le capteur 10 et la source optique 6 on peut à partir de cette mesure HM en déduire la distance, appelée HR (hauteur réelle), entre la source optique 6 et la surface 9. Si cette distance HR correspond à la distance HT (hauteur de travail), la source optique 6 n’est pas déplacée verticalement. En cas de décalage entre la distance réelle HR obtenue à partir de la mesure du capteur 10 et la distance HT, les moyens de commande 13 transmettent une consigne de déplacement aux moyens d’ajustement verticaux 11 pour corriger le décalage.  Once the displacement of the platform 5 and the optical module made, it is measured the distance HM (measured height) between the sensor 10 and the surface 9 of the resin. Given the fixed distance HC (sensor height) between the sensor 10 and the optical source 6 from this measurement HM can be deduced the distance, called HR (actual height), between the optical source 6 and the surface 9. If this distance HR corresponds to the distance HT (working height), the optical source 6 is not displaced vertically. In the event of a shift between the actual distance HR obtained from the measurement of the sensor 10 and the distance HT, the control means 13 transmit a displacement instruction to the vertical adjustment means 11 to correct the offset.
[0041 ] Lorsque le module optique déplace la source optique 6 horizontalement pour permettre la polymérisation d’une autre zone de travail, on actionne le capteur 10 correspondant à cette zone de travail de manière à disposer la source optique 6 à la hauteur de travail HT par rapport à la surface de la résine 9 dans le bac 7 correspondant s’il y a passage vers un nouveau bac. S’il s’agit du même bac 7, il est avantageux de réaliser à nouveau la mesure pour éviter tout décalage engendré par le déplacement de la source optique 6. [0042] Une fois l’éventuel décalage remis à zéro, le dispositif d’impression 1 actionne le balai 20, ce dernier étant disposé à une distance fixe de la source optique 6 est placé de manière optimale par rapport à la surface de la résine 9 grâce à la phase d’ajustement vertical. When the optical module moves the optical source 6 horizontally to allow the polymerization of another working area, the sensor 10 corresponding to this working area is actuated so as to have the optical source 6 at the working height HT relative to the surface of the resin 9 in the corresponding tray 7 if there is passage to a new tray. If it is the same tray 7, it is advantageous to perform the measurement again to avoid any shift caused by the displacement of the optical source 6. Once the offset is reset, the printing device 1 actuates the blade 20, the latter being disposed at a fixed distance from the optical source 6 is placed optimally relative to the surface of the resin 9 thanks to the vertical adjustment phase.
[0043] Dans la figure 2, le capteur 10 est fixé par rapport à la plateforme 5, cela étant fonctionnement de cette alternative est tout à fait similaire au premier mode de réalisation, sauf en ce que la hauteur entre la surface de la résine 9 et la source optique est déduite à partir de la hauteur entre la source optique 6 et la plateforme d’une part et la hauteur entre le capteur 10 et la surface 9, mesurée par le capteur 9 d’autre part. La hauteur réelle déduite HR entre la source optique 6 et la surface 9 est également comparée à la hauteur de travail HT pour commander un déplacement par les moyens d’ajustement vertical 11 en cas de décalage.  In Figure 2, the sensor 10 is fixed relative to the platform 5, this being operation of this alternative is quite similar to the first embodiment, except that the height between the surface of the resin 9 and the optical source is deduced from the height between the optical source 6 and the platform on the one hand and the height between the sensor 10 and the surface 9, measured by the sensor 9 on the other hand. The actual height deduced HR between the optical source 6 and the surface 9 is also compared to the working height HT to control a displacement by the vertical adjustment means 11 in case of offset.
[0044] Le dispositif d’impression 1 tel que précité permet de positionner parfaitement la source optique 6 par rapport à la surface de la résine 9 de sorte que la mise au point de la source optique corresponde exactement à la distance avec la surface de la résine.  The printing device 1 as mentioned above makes it possible to perfectly position the optical source 6 with respect to the surface of the resin 9 so that the focusing of the optical source corresponds exactly to the distance with the surface of the resin.
[0045] Le dispositif d’impression 1 permet par conséquent de corriger les décalages existants dans les dispositifs de l’état de la technique et permet de réaliser une stéréolithographie d’une grande précision et notamment de l’ordre de 50pm et jusqu’à 10 pm. Le dispositif d’impression permet ainsi la fabrication d’objets en trois dimensions nécessitant des détails de réalisation très précis et notamment des objets médicaux tels que des prothèses dentaires.  The printing device 1 therefore makes it possible to correct the existing offsets in the devices of the state of the art and makes it possible to carry out a stereolithography of great precision and in particular of the order of 50 μm and up to 10 pm The printing device thus makes it possible to manufacture three-dimensional objects requiring very precise production details and in particular medical objects such as dental prostheses.
[0046] Bien entendu, d’autres caractéristiques de l’invention auraient également pu être envisagées sans pour autant sortir du cadre de l’invention définie par les revendications ci-après.  Of course, other features of the invention could also be envisaged without departing from the scope of the invention defined by the claims below.

Claims

Revendications claims
[Revendications 1 ] Dispositif d’impression pour la fabrication additive d’objet en 3D par polymérisation successive de couches (3) de résine comportant une structure de support (4) permettant la réception d’une plateforme (5) de fabrication de l’objet 3D et la réception d’une source optique (6), ladite plateforme (5), permettant le support de l’objet dans un bac (7) de résine, étant mobile en translation verticale à chaque ajout de couche (3) selon une hauteur fixe (Hc) caractérisé en ce que le dispositif comprend en outre :  [Claims 1] Printing device for additive manufacturing of 3D objects by successive polymerization of resin layers (3) comprising a support structure (4) for receiving a platform (5) for manufacturing the 3D object and the reception of an optical source (6), said platform (5), allowing the object to be supported in a resin container (7), being mobile in vertical translation at each addition of a layer (3) according to a fixed height (Hc) characterized in that the device further comprises:
- des moyens de mesure (8) de la distance entre la source optique (6) et la surface de la résine (9) dans le bac (7),  measuring means (8) for the distance between the optical source (6) and the surface of the resin (9) in the tank (7),
- des moyens d’ajustement verticaux (11 ) et horizontaux (12) de la position de la source optique (6), disposés sur la structure de support (4), en fonction des valeurs mesurées par lesdits moyens de mesure permettant d’obtenir une distance constante entre la source optique (6) et la surface de la résine (9), vertical (11) and horizontal (12) adjustment means of the position of the optical source (6), arranged on the support structure (4), as a function of the values measured by said measurement means making it possible to obtain a constant distance between the optical source (6) and the surface of the resin (9),
- des moyens de commande (13) du déplacement des moyens d’ajustement verticaux (11 ) et horizontaux (12) pour délivrer une commande de déplacement des moyens d’ajustement verticaux et horizontaux. control means (13) for moving the vertical (11) and horizontal adjustment means (12) to deliver a displacement control of the vertical and horizontal adjustment means.
[Revendications 2] Dispositif d’impression pour la fabrication additive d’objet en trois dimensions, selon la revendication 1 , dans lequel les moyens de mesure (8) de la distance comportent un capteur de distance (10) à distance constante avec la source optique (6), le capteur (10) permettant de mesurer la distance entre lui-même et la surface de la résine (9). [Claims 2] Printing apparatus for three-dimensional object additive manufacturing according to claim 1, wherein the distance measuring means (8) comprises a distance sensor (10) at a constant distance from the source. optical (6), the sensor (10) for measuring the distance between itself and the surface of the resin (9).
[Revendications 3] Dispositif d’impression pour la fabrication additive d’objet en trois dimensions, selon la revendication 1 , dans lequel les moyens de mesure (8) de la distance comportent un capteur de distance (10) à distance constante avec la plateforme (5) permettant de mesurer la distance entre lui- même et la surface de la résine (9). [Claims 3] A three-dimensional object additive printing device according to claim 1, wherein the distance measuring means (8) comprises a distance sensor (10) at a constant distance from the platform. (5) for measuring the distance between itself and the surface of the resin (9).
[Revendications 4] Dispositif d’impression pour la fabrication additive d’objet en trois dimensions, selon l’une quelconque des revendications précédentes, dans lequel les moyens de mesure (8) comportent au moins deux capteurs de mesure (10), chaque capteur (10) étant associé à une zone de travail ou plusieurs capteurs étant associés à une zone de travail. [Claims 4] Printing apparatus for three-dimensional object additive manufacturing according to any one of the preceding claims, wherein the measuring means (8) comprises at least two measuring sensors (10), each sensor (10) being associated with a working area or a plurality of sensors being associated with a work area.
[Revendications 5] Dispositif d’impression pour la fabrication additive d’objet en trois dimensions, selon l’une quelconque des revendications précédentes, dans lequel les moyens de mesure (8) comportent un de capteur de mesure (10) de type laser ou doppler. [Claims 5] Printing apparatus for three-dimensional object additive manufacturing according to any one of the preceding claims, wherein the measuring means (8) comprise a laser-type measuring sensor (10) or Doppler.
[Revendications 6] Dispositif d’impression pour la fabrication additive d’objet en trois dimensions, selon l’une quelconque des revendications précédentes, dans lequel les moyens d’ajustement verticaux (11 ) et horizontaux (12) de la source optique (6) comportent un module optique (14), portant la source optique, est relié à la partie haute (15) de la structure de support (4) par au moins un rail de guidage vertical (16) et des premiers moyens motorisés (17) permettant l’entraînement vertical du module optique (14) le long dudit rail. [Claims 6] Printing apparatus for three-dimensional object additive manufacturing according to any one of the preceding claims, wherein the vertical (11) and horizontal (12) adjustment means of the optical source (6) ) comprise an optical module (14), carrying the optical source, is connected to the upper part (15) of the support structure (4) by at least one vertical guide rail (16) and first motorized means (17) allowing vertical drive of the optical module (14) along said rail.
[Revendications 7] Dispositif d’impression pour la fabrication additive d’objet en trois dimensions, selon la revendication précédente, dans lequel le module optique (14) comprend au moins un rail de guidage horizontal (18) et des seconds moyens motorisés (19) permettant le déplacement horizontal de la source optique par rapport à la base du module optique. [Claims 7] Printing device for the additive manufacturing of three-dimensional objects, according to the preceding claim, wherein the optical module (14) comprises at least one horizontal guide rail (18) and second motorized means (19). ) allowing the optical source to move horizontally with respect to the base of the optical module.
[Revendications 8] Dispositif d’impression pour la fabrication additive d’objet en trois dimensions, selon l’une quelconque des revendications 6 et 7 précédentes, dans lequel un balai (20) est solidaire de du module optique permettant un déplacement vertical simultané et identique de la source optique (6) et de la lame du balai. [Claims 8] Printing device for the additive manufacturing of three-dimensional objects, according to any one of the preceding claims 6 and 7, wherein a wiper (20) is integral with the optical module allowing simultaneous vertical movement and identical to the optical source (6) and the blade of the blade.
[Revendications 9] Dispositif d’impression pour la fabrication additive d’objet en trois dimensions, selon l’une quelconque des revendications précédentes, dans lequel les moyens de commande (13) sont actionnés après chaque ajout de couche (3) ou après chaque changement de zone de travail par la source optique (6) j [Claims 9] A three-dimensional object additive printing device as claimed in any one of the preceding claims, wherein the control means (13) is actuated after each layer addition (3) or after each change of working area by the optical source (6) j
PCT/IB2019/052813 2018-04-23 2019-04-05 Printing device for the additive manufacture of an object in three dimensions by successive polymerization of layers of resin WO2019207387A1 (en)

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FR1870478A FR3080320B1 (en) 2018-04-23 2018-04-23 PRINTING DEVICE FOR ADDITIVE THREE-DIMENSIONAL OBJECT MANUFACTURE BY SUCCESSIVE POLYMERIZATION OF RESIN LAYERS.
FR18/70478 2018-04-23

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CN112757629A (en) * 2020-12-09 2021-05-07 安徽工程大学 Supporting structure of DLP optical engine of assembly of 3D printer

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US20020195748A1 (en) * 2000-08-29 2002-12-26 Farnworth Warren M. Layer thickness control for stereolithography utilizing variable liquid elevation and laser focal length
US20050172894A1 (en) * 2004-02-10 2005-08-11 Farnworth Warren M. Selective deposition system and method for initiating deposition at a defined starting surface
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WO2015083104A1 (en) * 2013-12-03 2015-06-11 Layerwise N.V. Method and device for calibrating multiple energy rays for the additive manufacturing of an object

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US20020195748A1 (en) * 2000-08-29 2002-12-26 Farnworth Warren M. Layer thickness control for stereolithography utilizing variable liquid elevation and laser focal length
US20050172894A1 (en) * 2004-02-10 2005-08-11 Farnworth Warren M. Selective deposition system and method for initiating deposition at a defined starting surface
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WO2015083104A1 (en) * 2013-12-03 2015-06-11 Layerwise N.V. Method and device for calibrating multiple energy rays for the additive manufacturing of an object

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