• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method for manufacturing a ceramic material raw part by the additive process technique in which layers of a photocurable paste are successively irradiation-cured in a pattern defined for each layer, the first layer being formed on a working surface (3) on a work table (4), each layer being spread by scraping from a mass of dough (2) fed to said work plate (4) before curing it, which is lowered at each layer formation. According to the invention, during the spreading of at least one of the photocurable paste layers, at least one scraper blade is brought into the working position, in addition to its scraping movement (8) or so-called movement. passes, to move back and forth in his plane, according to a so-called vibration movement.
    公开号:FR3052380A1
    申请号:FR1655464
    申请日:2016-06-14
    公开日:2017-12-15
    发明作者:Vincent Pateloup；Victor Chartier；Christophe Chaput
    申请人:Centre National de la Recherche Scientifique CNRS；Universite de Limoges；3DCeram SAS；
    IPC主号:
    专利说明:

    PROCESS AND MACHINE FOR THE PRODUCTION OF WORKPIECES BY THE TECHNIQUE OF PASSIVE ADDITIVE PROCESSES
    The present invention relates to a method and a machine for manufacturing parts by additive methods.
    These parts are in particular raw parts made of ceramic material intended to be subjected to cleaning, debinding and sintering operations to obtain finished ceramic pieces.
    The technique of additive processes, also known as stereolithography, generally comprises the following steps, for obtaining such raw parts: - a computer model of the part to be manufactured is constructed by computer-assisted design, the model of which the dimensions are more larger than those of the part to be manufactured in order to provide for a removal of the ceramic during the manufacture of the part; and the work is manufactured using the additive process technique, in which: a first layer of a photocurable composition, generally comprising at least one ceramic material, is formed on a rigid support or on a part during manufacture, at least one dispersant, at least one photocurable monomer and / or oligomer, at least one photoinitiator and at least one plasticizer; the first layer of the photocurable composition is cured by irradiation in a pattern defined from the model for said layer, forming a first stage; a second layer of the photocurable composition is formed on the first stage; the second layer of the photocurable composition is cured by irradiation in a pattern defined for said layer, forming a second stage, this irradiation being carried out by laser scanning of the free surface of the spread photocurable composition or by a projection system with diodes; optionally, the above steps are repeated to obtain the part in the green state.
    The present invention relates to additive processes in which the photocurable composition is in the form of a paste whose composition is indicated above and whose viscosity may vary in particular from 1 Pa.s to infinity for a shear rate. no.
    In a pasty production, the rigid support is a work plate supporting the different layers of the workpiece being constructed as well as the dough and each of the layers is formed by lowering the work plate and spreading a thickness predefined dough. A stock of dough is stored in tanks which are automatically emptied of a quantity of paste predefined to each layer by means of a piston. This creates a bead of paste to be spread on the upper layer of the part being manufactured which has been lowered beforehand by the work plate.
    Each layer is spread by scraping by a scraper blade which scans the working surface of the work plate, for example by moving in a straight horizontal direction.
    Under these conditions, there appear irregular and inhomogeneous layers in terms of thickness, which ranges from a few tens of microns to several millimeters. As a result, the part will not have a good external appearance and unwanted internal stresses may appear within it, so that the manufactured parts must be discarded.
    In addition, significant scraping efforts can be generated during the layered construction phase, so that the parts break during their construction.
    US Pat. No. 5,902,537 discloses a roller-based scraper device for spreading the dough to homogenize the thickness of the layers. This device is not suitable for viscous compositions and proves impractical in use, because of the difficulty in cleaning it after use.
    The object of the present invention is to remedy these drawbacks, namely to improve the homogeneity of each layer of pulp spread, to avoid too great scraping efforts which can destroy the parts under construction, and to make easier the cleaning the scraping device. For this purpose, according to the invention, it is provided that the uniform spreading of the dough is ensured by the combination of the sweeping movement or horizontal movement of the blade, which in a conventional manner scrapes, with a movement Oscillating or horizontal vibration movement and orthogonal to the previous and in the plane of construction of the layer. The oscillations make it possible to animate at least the upper part of the layer to be spread with a sufficiently high shear rate in order to thin the paste of rheofluidifying behavior to spread out and thus to reduce the scraping forces considerably.
    The subject of the present invention is therefore a process for manufacturing a ceramic material raw part by the technique of additive processes, in which layers of a photo-curable paste are successively brought to be hardened by irradiation in a pattern defined for each layer, first layer being formed on a working surface on a work table, each layer being, before curing in the defined pattern, spread by scraping from a mass of dough fed to said work plate, which is lowered at each layer formation, characterized in that, during the spreading of at least one of the photocurable paste layers, at least one scraping blade is brought into the working position, in addition to its scraping or movement movement said pass, to move back and forth in his plane, according to a movement called vibration.
    In a first embodiment, the pass movement can be carried out by advancing, in rectilinear horizontal motion, the scraping blade (s) of an edge of the working surface along which it has been fed in the form of a bead. the dough mass to be spread, at the opposite edge thereof, for spreading said bead of dough on the work surface. The pass movement here is perpendicular to the plane of the at least one blade.
    In a second embodiment, the pass movement can be conducted by sweeping the scraping blade (s) in a pivotal movement about an axis perpendicular to the work surface and positioned at a point thereof.
    The vibration frequency can advantageously be determined according to the rheological characteristics of the dough, the frequency being chosen to reduce the viscosity of the dough.
    At least one blade may be vibrated by a mechanical or piezoelectric or electromagnetic exciter system, the vibration frequencies advantageously being respectively 1-200 Hz, 500-5000 Hz or 100-1000 Hz depending on whether the system is mechanical, piezoelectric or electromagnetic.
    In particular, the vibration movement can be conducted by a mechanical exciter system at a frequency of 1 to 100 Hz, in particular 35 to 55 Hz.
    The vibration movement can be driven over a distance of 0.1 to 5 mm.
    The scraping blade (s) can be held in tension between two springs to modify the natural frequency of the vibration movement, advantageously allowing the blade (s) to vibrate at the resonant frequency of the oscillating system composed of the blade (s), or optionally associated blade holders and said springs.
    The depth of penetration into the dough of the scraping edge of a blade or each blade can be adjusted.
    It is possible to use a single scraper blade, or at least two scraping blades parallel to each other, contiguous or spaced apart, the scraping edges of said blades being arranged at staggered heights, the scraping edge of the etching blade being the most raised relative to the working surface, the vibration frequencies of said blades may be different.
    According to a particular embodiment of implementation of the manufacturing process of the parts according to the invention: (a) on a work plate, a pulp mass is brought to spread, then spread by scraping with the aid of the scraper blade or blades, in a horizontal direction, or pass direction, a first layer of said paste; (b) the desired area of said first layer is cured by irradiation in a previously defined pattern for said layer, forming a first cured layer in the desired area; (c) on all of said first cured layer in the desired area, a second layer of dough is spread by scraping with the scraper blade (s) in the direction of the pass; (d) irradiating the desired area of the second layer of pulp by irradiation in a previously defined pattern for said layer, forming on the first layer a second layer cured in the desired area; (e) repeating the succession of steps of spreading a layer of paste and hardening the desired areas of each layer as many times as necessary until the piece is obtained, where, during the spreading of At least one of the layers of dough, the scraping blade (s) is brought into the working position to move back and forth in a vibrational movement in a horizontal direction perpendicular to the direction of flow. The invention also relates to a machine for manufacturing ceramic material raw parts by the technique of additive processes in which layers of a photocurable paste are brought successively to harden by irradiation in a pattern defined for each layer, said machine comprising: - a frame framing a horizontal work platform with a work surface; - A gantry provided with at least one scraping blade, the gantry being adapted to move on the frame above the work plate so that the free edge of the scraping blade or blades is able to spread by scraping layers of dough on the work surface, said layers being superimposed vertically; - Irradiation means facing the work platform for irradiating each layer once spread to harden in the previously defined pattern before spreading the next layer, which is in turn hardened in the defined pattern, characterized by the the blade (s) are slidably mounted back and forth in their plane to provide a so-called vibration back and forth movement during at least one gantry pass in the direction of pass on the work surface .
    This machine is particularly intended for the implementation of the method as defined above.
    The blade or blades are preferably movable vertically.
    The machine may comprise one or more blade holders, each carrying at least one blade and being movable vertically on the gantry, the blade holder (s) being able to be held (s) and moved (s) in a raised position, raised up to above the worktop. In particular, one or more blades may be arranged on a blade holder or a blade holder may be provided per blade.
    The or each blade holder may comprise at least one horizontal rail and the or each blade may comprise at least one pad for its guidance on the at least one rail.
    The machine may advantageously comprise a device for exciting the vibration movement of the blade or blades by a mechanical or piezoelectric or electromagnetic system.
    According to a first embodiment, the excitation device is an eccentric excitation mechanism and comprises an assembly consisting of a motor and a disc driven by the motor either directly or via a belt along an axis. eccentric rotation, the eccentric axis of rotation being arranged in the direction of pass.
    According to a second embodiment, the excitation device is a mechanism comprising an assembly consisting of a motor, a crank and a connecting rod connected at one end to the front face of the blade or blades and at the other end to the crank driven by the motor along an eccentric axis of rotation, said eccentric axis of rotation being arranged in the direction of passage, said connecting rod moving in the plane of the blade or blades.
    According to a third embodiment, the excitation device is a mechanism comprising an assembly constituted by a motor and a cam in contact with a blade, said cam, driven by the motor along an eccentric axis of rotation, rolling, when its movement of rotation, sliding against the blade or the blades and it or conferring them the movement back and forth.
    In the three embodiments mentioned above, the motor can be regulated by the control of the machine, being advantageously regulated in tension to ensure the desired frequency for the vibration movement. By way of example, mention may be made of an engine speed of 3000 rpm producing a frequency of 50 Hz.
    According to a fourth embodiment, the excitation mechanism is a piezoelectric exciter system.
    According to a fifth embodiment, the excitation mechanism is an electromagnetic exciter system.
    The machine may also advantageously comprise elastic return means of the blade or blades in a direction perpendicular to the direction of the pass.
    The machine according to the invention may comprise a single blade or at least two blades, which are parallel to each other, contiguous or spaced, with a common excitation device of the vibration movement or an excitation device associated with each of them .
    The blade holder or the blade holder may or may have rollers him or allowing them to roll on the frame.
    The irradiation means may be constituted, by way of non-limiting example, by a laser, laser diodes, UV lighting, etc.
    To better illustrate the object of the present invention will be described below, by way of indication and not limited to several embodiments with reference to the accompanying drawing.
    In this drawing: FIGS. 1 to 6 are diagrammatic perspective views illustrating the different positions taken, during a spreading cycle by scraping a layer of dough, by a scraper device according to a first embodiment a sintered body manufacturing machine by the additive layer-by-layer method technique; the movement mechanism in translation in its plane of the scraping blade has been omitted from these figures so as not to overload them; 7 is, on a larger scale and at the same angle as FIGS. 1 to 6, a perspective view of said mechanism for translational movement of the scraper blade, which is mounted on the latter and on the blade holder ; - Figure 8 is, on a larger scale, a front view corresponding to Figure 7; Figures 9 and 10 are cross-sectional views respectively of IX-IX and X-X of Figure 8, Figure 10 being on a larger scale; Figure 11 is a side view along arrow XI of Figure 8; Figure 12 is a top view corresponding to Figure 8; Figure 13 is a view similar to Figure 1 but showing the mechanism of transverse displacement of the scraper blade on its blade holder according to a second embodiment; Figure 14 is a perspective view of a triple scraper blade; Figure 15 is a front view corresponding to Figure 14; - Figure 16 is a sectional view along XVI-XVI of Figure 15; Figure 17 is a top view corresponding to Figure 15; and Figure 18 is a view similar to Figure 2 illustrating a mounting which comprises two scraping blades to each of which are associated a means for exciting the vibration movement and elastic return means.
    Referring to FIGS. 1 and 7 to 12, it can be seen that a device 1 for scraping a layer of dough 2 on a working surface 3 of a horizontal working plate 4 is shown. a raw material manufacturing machine made of ceramic material by the technique of additive processes.
    The scraper device 1, slidably mounted on the frame 5 of the machine, comprises, from the rear towards the front, if one looks at FIG. 1, a gantry 6, a blade holder 7 mounted vertically sliding to the front of the gantry 6, and a scraper blade 8 having a horizontal scraping edge, mounted with possibility of transverse horizontal displacement back and forth relative to the blade holder 7.
    The frame 5 comprises two elongated blocks 5a located on either side of the work plate 4, each of these blocks 5a carrying a rib 5b which extends horizontally over its entire external lateral face and whose role is indicated below.
    Gantry 6 consists of a block comprising an upper part 6a in the shape of a rectangular parallelepiped extending by two lower lateral parts 6b.
    The front face of the upper portion 6a carries, in each of its junction regions with each of the lateral portions 6b, a projection 6c of U-shaped section, one wing of which is contiguous to the front face of the portion 6a, the grooves 6d of these U-shaped sections being arranged opposite one another. The role of these grooves 6d is indicated below.
    In the vicinity of its base, each lateral portion 6b has, facing inwardly, a groove 6e in which the associated block 5a of the frame 5 is slidable by its corresponding rib 5b.
    The blade holder 7 consists of a U-shaped plate whose lateral parts bear the reference numeral 7a and which are arranged parallel to the front face of the block 6a of the gantry 6, a rib 7b being carried by the outer edge of the blade holder 7 allowing the sliding of the latter in the groove 6d associated with the gantry 6. The blade holder 7 could equally well be a complete plate.
    In Figure 1, it can also be seen that a notch 7c is formed in the base of each plate 7a of the blade holder 7, each notch serving as a housing for a cylindrical roller 9 adapted to rotate about a horizontal axis. These rollers 9 are arranged at a height such that they will roll on the upper part of the respective blocks 5a of the frame 5 when the blade holder 7 is lowered. They allow to maintain a good height the blade holder 7 relative to the frame 5. It may however be noted that they are optional.
    The scraper blade 8 has a chamfered lower edge 8a.
    In Figure 1, one can also see the slides or rails 10 integral with the blade holder 7, which will be described with reference to Figure 7.
    Referring now to Figures 8, 10 and 11, it can be seen that the chamfered cutting edge 8a of the cutting blade 8 is part of a lower thin strip 8b, which is applied against the inner face of the blade. 8 blade having a corresponding inward recess 8c and which is fixed to said blade 8 by screws 8d.
    FIGS. 10, 11 and 12 also show diagrammatically the attachment system 11 to a motorization which is associated with the blade holder 7 and whose operation makes it possible to raise and lower the blade holder 7 under the conditions which will be described below.
    Referring now to Figures 7 to 11, it can be seen that two horizontal guide rails 10 are integral with the blade holder 7, on its front face and in its lower part.
    Four pads 12 are secured to the rear face of the scraper blade 8 by screws 13, in positions allowing them to slide in the respective rails 10 during the vibration movement of the scraper blade 8 which will be described below. .
    The translational movement mechanism of the blade 8 on its blade holder 7 will now be described.
    A first support 14 of triangular shape is applied against the front face of the blade 8 at the upper part thereof, on one side (the right side if one looks at Figures 7 and 8), and fixed to said blade 8 by its base with two screws 15, the upper tip portion of said support protruding above the blade 8.
    Against the outer face of the support 14, is applied and fixed an elongate plate 16 which protrudes from one side of the support 14 (on the left if we look at Figures 7 and 8). In this plate 16 is made an elongated oblong hole 17, of horizontal axis traversed perpendicularly by two adjusting screws 18, whose role is indicated below.
    A second support 19, of the same shape as the first support 14, is applied against the rear face of the blade 8, to face said first support 14.
    An eccentric wheel 20 is mounted between the upper, pointed portions of the two supports 14 and 19, above the scraper blade 8, the eccentric axis 21 of said wheel 20 rotating in bearings 22 and 23, respectively. 21 axis projecting from the front of the plate 14 and receives a toothed pulley 24 on which passes a toothed belt 25, which passes on a toothed pulley 26 associated with a motor 27.
    On the other hand, referring to FIGS. 7, 8 and 9, it can be seen that on each side of the blade 8 is arranged a helical spring 28.
    Each helical spring 28 is introduced, by its end region 28a opposite the blade 8, into a cylindrical bore 29a of a cage 29 mounted by screws 30 on the blade holder 7, the end of the spring 28 coming into position. stop against the bottom 29b of the bore 29a.
    The end region 28b adjacent to the blade 8 abuts against the bottom 31a of a cylindrical bore 31b of a cylindrical cage 31 whose end region opposite the cage 29 caps the corresponding end region of the blade 8 to be fixed by a screw 32.
    To activate the excitation for the vibration movement of the blade 8, the motor 27 is actuated which drives the toothed belt 25 whose tension has been adjusted by the adjusting screws 18 and which rotates the wheel 20 to eccentric, which creates an alternative translation movement of the blade 8 in its plane. The springs 28 hold the blade 8 in tension with each other in order to modify the natural frequency of the vibrating system, making it possible to respond better to the behavior of the dough.
    We will now describe a cycle of spreading a layer of dough by scraping with reference to Figures 1 to 6.
    Figure 1
    The scraping device is at rest. The scraper blade 8 is raised and motionless.
    Figure 2
    The scraper blade 8 is lowered and stopped when the desired layer height is good.
    Figure 3
    The paste is spread in advance of the scraper blade, which is during this advance subjected to excitation for vibration movement, as described above.
    Figure 4
    The scraper blade is almost at the end of its race.
    Figure 5
    The scraping blade is then raised to be released from the dough and is returned to the rest position of Figure 6.
    It is found that the spreading of the dough at each pass is made perfectly homogeneous, the piece obtained having proved satisfactory.
    Referring to FIG. 13, it can be seen that another embodiment of the vibration mechanism of the blade 8 with respect to the blade holder 7 is diagrammatically shown. A connecting rod 133 is fixed with a part at a position 134 on the blade 8 and secondly at an eccentric position 135 of a crank 136 driven in rotation by a motor 137 whose axis is fixed on the blade holder 7, on one side of the (right side if you look at Figure 13).
    To start the excitation for the vibration movement of the blade 8, the motor 137 is actuated which starts the crank-crank system, which creates an alternative translation movement of the blade 8 without its plane.
    It may be noted that the vibration mechanism of FIGS. 7 and 13 could be replaced by a piezoelectric or electromagnetic exciter housed in a housing to be mounted on the blade 8.
    Referring to FIGS. 14 to 17, it can be seen that a triple blade 108 has been represented which is an embodiment variant of the blade 8 previously defined and whose elements bear reference numerals that are greater than 100 to those of the respective elements of the blade 8. In fact, it is the lower thin strips which are now three in number (108bi, 108b2 and 108b3), applied against each other, bearing the cutting edges respectively 108ai, 108a2 and lOSas, and arranged on the blade 108 at different heights so that the front edge 108a penetrates less deeply into the mass of dough to be spread than the next edge 108a2, itself penetrating less deeply into the mass of dough to spread that edge 108a3.
    It is then easier to spread the dough, because the force to be applied to each of the blades during scraping is less than in the case of a single blade.
    The assembly of Figures 14 to 17 is only an example of mounting, the lower thin strips may also be spaced apart from one another or the three blade edges may belong to three different blades and no longer to strips thin lower carried by a single blade.
    With reference to FIG. 18, it can be seen that a device 200 is shown which differs from the device 1 of FIGS. 1 to 6 in that it comprises two scraping blades 8, 208 instead of 'a.
    In Figure 18, the same reference numerals designate the elements common to those of the device 1 and only the differences will be described hereinafter.
    Each projecting portion 6c of the gantry 6 is elongate to include a second groove 206d parallel to the groove 6d and located at the rear thereof in the example shown.
    In this grooves 206d slides a second blade holder 207 identical to the blade holder 7, which can be seen the side portions 207a slidable in the grooves 206d.
    The blade holder 207 may advantageously comprise rollers similar to the rollers 9 for rolling on the frame 5.
    The second scraper blade 208, whose height is such that it will penetrate deeper into the dough than the blade 8, is mounted on the side portions 207a of the blade holder 7 and is located between the side portions 7a and 207a. Like the blade 8, it comprises sliders able to slide in rails 210 of the blade holder 207.
    The blade 208 is able to move back and forth for the vibration movement under the action of the same excitation means as those described above, such means not shown in FIG. 18, likewise that the elastic return means similar to those of said blade 8. Thus, the excitation of the vibration movement of the two blades 8, 208 is independently adjustable.
    The operation of the device 200 is otherwise the same as that of the device 1, the two blades 8 and 208 advancing simultaneously in the forward movement movement while being subjected to the vibration movement.
    权利要求:
    Claims (22)
    [1" id="c-fr-0001]
    1 - Process for the production of a green part made of ceramic material by the technique of additive processes in which layers of a photo-curable paste (2) are brought successively to harden by irradiation in a pattern defined for each layer, the first layer being formed on a work surface (3) on a work table (4), each layer being spread by scraping from a mass of dough fed to said work table (4) before curing it in a defined pattern (4) , which is lowered at each layer formation, characterized in that, during the spreading of at least one of the photo-curable paste layers, at least one scraper blade is brought into the working position, in addition to its scraping movement (8; 108; 208) or movement called pass, to move back and forth in its plane, according to a so-called vibration movement.
    [2" id="c-fr-0002]
    2 - Process according to claim 1, characterized in that the movement of pass is carried out by advancing, in a rectilinear horizontal movement, the scraping blade or blades (8; 108; 208) of an edge of the working surface (3) along which the dough mass (2) to be spread, at the opposite edge thereof, has been fed in the form of a bead so as to spread said dough bead (2) on the work surface (3).
    [3" id="c-fr-0003]
    3 - Process according to claim 1, characterized in that one conducts a pass movement by scanning the scraping blade or blades in a pivoting movement about an axis perpendicular to the work surface and positioned at a point of the latter.
    [4" id="c-fr-0004]
    4 - Process according to one of claims 1 to 3, characterized in that the vibration frequency is determined according to the rheological characteristics of the dough (2), the frequency being chosen to reduce the viscosity of the dough.
    [5" id="c-fr-0005]
    5 - Method according to one of claims 1 to 4, characterized in that one puts at least one scraper blade (8; 108; 208) in vibration motion by a mechanical or piezoelectric or electromagnetic exciter system , the vibration frequencies being advantageously respectively 1-200 Hz, 500-5000 Hz or 100-1000 Hz depending on whether the system is mechanical, piezoelectric or electromagnetic.
    [6" id="c-fr-0006]
    6 - Process according to claim 5, characterized in that one drives the vibration movement by a mechanical exciter system at a frequency of 1 to 100 Hz, in particular 35 to 55 Hz.
    [7" id="c-fr-0007]
    7 - Method according to one of claims 1 to 6, characterized in that one drives the vibration movement on a stroke of 0.1 to 5 mm.
    [8" id="c-fr-0008]
    8 - Method according to one of claims 1 to 7, characterized in that one maintains the scraping blade or blades (8; 108; 208) in tension between two springs (28) to modify the natural frequency of the movement vibration, advantageously allowing the blade or blades to vibrate at the resonant frequency of the oscillating system consisting of the blade or blades (8; 108; 208), the associated blade holder (s) and said springs (28).
    [9" id="c-fr-0009]
    9 - Method according to one of claims 1 to 6, characterized in that one adjusts the depth of penetration of the paste of the scraping edge of a blade or each blade (8; 108; 208).
    [10" id="c-fr-0010]
    10 - Method according to one of claims 1 to 9, characterized in that one uses a single scraper blade (8), or at least two scraping blades (108; 208) parallel to each other, contiguous or spaced apart the scraper edges of said blades (108; 208) being arranged at staggered heights, the scraping edge (8) of the driver blade being the highest relative to the working surface (3), the frequencies of vibration of said blades (108; 208) may be different.
    [11" id="c-fr-0011]
    11 - Method according to one of claims 1 to 10, characterized in that: (a) on a work plate (4), is brought a mass of dough (2) to be spread, and then spread by scraping with using the scraper blade (s) (8; 108; 208) in a horizontal direction or pass direction a first layer of said dough (2); (b) the desired area of said first layer is cured by irradiation in a previously defined pattern for said layer, forming a first cured layer in the desired area; (c) on all of said first cured layer in the desired area, a second layer of dough (2) is spread by scraping with the scraper blade (s) (8; 108; 208) according to the direction of pass; (d) irradiating the desired area of the second layer of pulp by irradiation in a previously defined pattern for said layer, forming on the first layer a second layer cured in the desired area; (e) repeating the succession of steps of spreading a layer of dough (2) and hardening the desired areas of each layer as many times as necessary until the part is obtained, where, during spreading at least one of the dough layers (2), the scraping blade (s) (8; 108; 208) are brought into the working position to move back and forth according to a vibration movement in a horizontal direction perpendicular to the direction of the pass.
    [12" id="c-fr-0012]
    12 - Machine for manufacturing ceramic material raw parts by the technique of additive processes in which layers of a photocurable paste are successively brought to be hardened by irradiation in a pattern defined for each layer, said machine comprising: - a frame (5 ) flanking a horizontal work table (4) having a working surface (3); - a gantry (6) provided with at least one scraper blade (8; 108; 208), the gantry (6) being able to move on the frame (5) above the work plate (4) of such that the free edge (8a) of the scraper blade (s) (8; 108; 208) is capable of scraping dough layers (2) on the work surface (4), said layers being superposed vertically ; Irradiation means facing the work plate (4) for irradiating each layer once spread to harden it in the previously defined pattern before spreading the next layer, which is in turn hardened in the defined pattern, characterized by the fact that the blade (s) (8; 208; 208) are slidably mounted back and forth in their plane to provide a so-called reciprocating movement of vibration during at least one pass of the gantry (6) according to the direction of pass on the work surface (4).
    [13" id="c-fr-0013]
    13 - Machine according to claim 12, characterized in that it comprises one or more blade holder (7; 207), each carrying at least one blade (8; 108; 208) and being movable vertically on the gantry (6 ), the or the blade holder (7; 207) can be held (s) and moved (s) in a raised position, raised above the work plate (4).
    [14" id="c-fr-0014]
    14 - Machine according to claim 13, characterized in that the or each blade holder (7; 207) comprises at least one horizontal rail (10; 210) and the or each blade (8; 108; 208) comprises at least a shoe (12) for guiding the at least one rail (10; 210).
    [15" id="c-fr-0015]
    15 - Machine according to one of claims 12 to 13, characterized in that it comprises a device for exciting the vibration movement of the blade or blades (8; 108; 208) by a mechanical or piezoelectric or electromagnetic system .
    [16" id="c-fr-0016]
    16 - Machine according to claim 15, characterized in that the excitation device is an eccentric excitation mechanism and comprises an assembly consisting of a motor (27) and a disc (20) driven by the motor (27) either directly or via a belt (25) along an eccentric axis of rotation, the eccentric axis of rotation being disposed in the direction of passage.
    [17" id="c-fr-0017]
    17 - Machine according to claim 15, characterized in that the excitation device is a mechanism comprising a set consisting of a motor (137), a crank (136) and a connecting rod (133) connected at one end to the face front of the blade or blades (8; 108; 208) and at the other end to the crank (136) driven by the motor (137) along an eccentric axis of rotation, said eccentric axis of rotation being arranged in the direction passage, said connecting rod (133) moving in the plane of the blade or blades (8; 108; 208).
    [18" id="c-fr-0018]
    18 - Machine according to claim 15, characterized in that the excitation device is a mechanism comprising a set consisting of a motor and a cam in contact with a blade, said cam, driven by the motor along an axis of eccentric rotation rolling, during its rotational movement, sliding against the blade or blades and he or giving them the movement back and forth.
    [19" id="c-fr-0019]
    19 - Machine according to one of claims 16 to 18, characterized in that the motor is controlled by the control of the machine, being advantageously regulated in tension to ensure the desired frequency for the vibration movement.
    [20" id="c-fr-0020]
    20 - Machine according to one of claims 15 to 19, characterized in that it comprises means (28) of resilient return of the blade or blades (8; 108; 208) in a direction perpendicular to the direction of past.
    [21" id="c-fr-0021]
    21 - Machine according to one of claims 12 to 20, characterized in that it comprises a single blade (8) or at least two blades (108; 208), which are parallel to each other, contiguous or spaced, with a common excitation device of the vibration movement or an excitation device associated with each of them.
    [22" id="c-fr-0022]
    22 - Machine according to one of claims 13 to 21, characterized in that the blade holder or the blade holder (7; 207) comprises (s) casters (9) him or allowing them to roll on the frame (5).
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    同族专利:
    公开号 | 公开日
    EP3257642A1|2017-12-20|
    US20170355100A1|2017-12-14|
    JP2017222166A|2017-12-21|
    FR3052380B1|2018-11-02|
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    CN111895909B|2020-07-06|2021-10-08|北新集团建材股份有限公司|Gypsum board wedge limit detects adjusting device|
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    法律状态:
    2017-04-25| PLFP| Fee payment|Year of fee payment: 2 |
    2017-12-15| PLSC| Search report ready|Effective date: 20171215 |
    2018-04-27| PLFP| Fee payment|Year of fee payment: 3 |
    2018-11-02| AU| Other action affecting the ownership or exploitation of an industrial property right|Effective date: 20181001 |
    2019-05-31| PLFP| Fee payment|Year of fee payment: 4 |
    2020-05-15| CD| Change of name or company name|Owner name: S.A.S 3DCERAM-SINTO, FR Effective date: 20200407 Owner name: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, FR Effective date: 20200407 Owner name: UNIVERSITE DE LIMOGES, FR Effective date: 20200407 |
    2021-03-12| ST| Notification of lapse|Effective date: 20210206 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1655464A|FR3052380B1|2016-06-14|2016-06-14|PROCESS AND MACHINE FOR THE PRODUCTION OF WORKPIECES BY THE TECHNIQUE OF PASSIVE ADDITIVE PROCESSES|
    FR1655464|2016-06-14|FR1655464A| FR3052380B1|2016-06-14|2016-06-14|PROCESS AND MACHINE FOR THE PRODUCTION OF WORKPIECES BY THE TECHNIQUE OF PASSIVE ADDITIVE PROCESSES|
    EP17175102.7A| EP3257642A1|2016-06-14|2017-06-08|Method and machine for manufacturing parts by additive manufacturing using a paste material|
    JP2017116130A| JP2017222166A|2016-06-14|2017-06-13|Method for producing piece by additional production technique by paste treatment, and production machine for performing the method|
    US15/622,410| US20170355100A1|2016-06-14|2017-06-14|Method for manufacturing pieces by the technique of additive manufacturing by pasty process and manufacturing machine for implementing the method|
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