JP2013075391A - Apparatus and program for creating three dimensional molding data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and program for creating a three dimensional molding object in an appropriate shape by suppressing influence of deformation of a molding layer generated in a planarizing process of a three dimensional molding powder.SOLUTION: A PC obtains prediction information used for predicting at least one of dragging and expansion (S22, S23, S28, S35). Dragging and expansion are phenomena occurring in the molding layer which is completely molded when planarizing the three dimensional molding powder with a planarizing roller. Particularly, dragging is a phenomenon in which the molding layer existing in the three dimensional molding powder is dragged and misaligned in the planarizing process with the planarizing roller, and expansion is a phenomenon in which the molding layer is dragged and expanded in the planarizing process. The PC creates the three dimensional molding data based on the obtained prediction information (S31-S33).

Description

  The present invention relates to a three-dimensional modeling data creation device that creates three-dimensional modeling data for modeling a three-dimensional modeled object, and a three-dimensional modeling data creation program.

  Conventionally, there is known a three-dimensional modeling apparatus that models a three-dimensional model by mixing and solidifying a three-dimensional modeling powder and a modeling liquid. For example, the three-dimensional modeling apparatus flattens the three-dimensional modeling powder by moving relative to a three-dimensional modeling powder arranged on the stage by a flattening means such as a roller, a rod, a plate, etc. A powder layer "). A modeling liquid is discharged to the formed powder layer using an inkjet head. When the three-dimensional modeling powder and the modeling liquid are mixed, the adhesive contained in the three-dimensional modeling powder is dissolved, and the dissolved adhesives are bonded to each other. As a result, a layer of a three-dimensional structure (hereinafter referred to as “modeling layer”) is formed. A three-dimensional modeling apparatus models the three-dimensional molded object of a predetermined | prescribed shape by repeating the above process and overlapping a modeling layer.

  The three-dimensional modeled object may be deformed during or after the modeling of the three-dimensional modeled object. The three-dimensional modeling apparatus disclosed in Patent Document 1 estimates a distortion caused by a volume change of the modeling liquid, and corrects the three-dimensional data so that the distortion is canceled out.

JP 2009-107244 A

  When the three-dimensional modeling powder placed on the stage is flattened by the flattening means, if the modeling layer that has already been modeled is present in the three-dimensional modeling powder, the modeling layer is deformed in the process of flattening (in particular, (It may be deformed in the moving direction of the flattening means). The three-dimensional modeling apparatus disclosed in Patent Literature 1 has not been able to suppress the influence of deformation of the modeling layer that occurs in the process of flattening the three-dimensional modeling powder.

  The present invention relates to a three-dimensional modeling data creation device and a three-dimensional modeling data creation program for creating a three-dimensional modeling object having an accurate shape while suppressing the influence of deformation of a modeling layer generated in the process of flattening a three-dimensional modeling powder. The purpose is to provide.

  In order to achieve the above-mentioned object, the three-dimensional modeling data creation device according to the first aspect of the present invention includes a stage on which a three-dimensional modeling powder that is solidified by mixing with a modeling liquid is placed, and the stage, It is formed by a flattening means for flattening the surface of the three-dimensional modeled powder placed on the stage to form a powder layer by relatively moving in a direction parallel to the stage surface of the stage, and the flattening means. Further, by discharging the modeling liquid onto the powder layer, a discharge unit that forms a modeling layer that is a layer of a three-dimensional modeled object, and the stage surface and the flattening unit are perpendicular to the stage surface. A three-dimensional modeling data creation device for creating three-dimensional modeling data for controlling a three-dimensional modeling apparatus provided with lifting means for changing the distance in the direction from the three-dimensional data indicating the three-dimensional modeling object to be modeled, and the modeling is completed do it The drag layer is a phenomenon in which the modeling layer is dragged and shifted in the process of forming the powder layer on the top surface of the modeling layer by the flattening means, and the phenomenon is expanded and expanded. Prediction information acquisition means for acquiring prediction information used for prediction of at least one of expansion, and three-dimensional modeling data generation means for generating the three-dimensional modeling data based on the prediction information acquired by the prediction information acquisition means Yes.

  According to the three-dimensional modeling data creating apparatus according to the first aspect of the present invention, the three-dimensional modeling apparatus is at least one of dragging and expansion generated when the three-dimensional modeling powder is flattened (hereinafter simply referred to as “dragging / expansion”). ) Can be modeled according to the three-dimensional modeling data that has been considered in advance. Therefore, the three-dimensional modeling apparatus can suppress the influence of dragging and expansion, and can model a three-dimensional modeled object with an accurate shape.

  Further, the prediction information acquisition unit acquires at least information on a moving direction of the flattening unit with respect to the stage, and information on a position of the modeling layer based on the three-dimensional data, and the three-dimensional modeling data creation unit includes the The discharge means is controlled by setting a position shifted from the position of the modeling layer based on the three-dimensional data in a direction opposite to the moving direction of the flattening means as a discharge position for causing the discharge means to discharge the modeling liquid. There may be provided first discharge data creating means for creating the discharge data to be performed. In this case, the modeling layer that has been modeled is dragged by the flattening means, whereby the position of the modeling layer moves to an accurate position. Accordingly, the three-dimensional modeling apparatus can model a three-dimensional object having an accurate shape even when dragging occurs due to flattening.

  Further, the prediction information acquisition unit acquires at least information on a moving direction of the flattening unit with respect to the stage and information on a range in which the modeling layer is modeled, and the three-dimensional modeling data creation unit includes the modeling layer The discharge data for controlling the discharge means is set by setting a discharge range for causing the discharge means to discharge the modeling liquid in a range in which the range in which the liquid is formed is compressed in a direction opposite to the moving direction of the flattening means. You may provide the 2nd discharge data preparation means to produce. In this case, when the modeling layer for which modeling has been completed is extended by the flattening means, the position and shape of the modeling layer (that is, the range in which the modeling layer is modeled) become an accurate position and shape. Therefore, the three-dimensional modeling apparatus can model a three-dimensional modeled object with an accurate shape even when expansion occurs in the modeling layer by flattening.

  Further, the prediction information acquisition unit acquires at least information on a moving direction of the flattening unit with respect to the stage and information on a range in which the modeling layer is modeled, and the three-dimensional modeling data creation unit includes the modeling layer Comprises a first angle setting means for setting an arrangement angle of the three-dimensional object to be shaped on the stage so that a range in which the object is shaped is symmetric with respect to an axis extending in the moving direction of the flattening means. May be. In this case, drag / expansion occurs in the moving direction of the flattening means. Therefore, the effect of dragging / expansion appears symmetrically by bringing the range in which the modeling layer is modeled close to symmetry with respect to the axis extending in the moving direction of the flattening means. Therefore, even when dragging / expansion larger than the predicted level occurs, it is possible to prevent the appearance of the three-dimensional structure from being deteriorated.

  Further, the prediction information acquisition unit acquires at least information on a moving direction of the flattening unit with respect to the stage and information on a range in which the modeling layer is modeled, and the three-dimensional modeling data creation unit includes the modeling layer The arrangement angle of the three-dimensional object to be modeled on the stage is set so that the projected area when the range in which the object is modeled is projected onto a plane perpendicular to the moving direction of the flattening means is minimized. Bi-angle setting means may be provided. In this case, the drag amount and the expansion amount of the modeling layer are minimized. Therefore, the 3D modeling apparatus can model the 3D model more accurately.

  Further, the three-dimensional modeling data creation means may include flattening data creation means for creating flattening data for controlling the flattening means in accordance with the prediction information acquired by the prediction information acquisition means. . In this case, the three-dimensional modeling apparatus can drive the flattening means under optimum conditions corresponding to the predicted dragging and expansion of the modeling layer.

  In addition, the prediction information acquisition unit acquires at least information on a range in which the modeling layer is modeled, and the planarization data generation unit includes the planarization unit while passing over the modeling layer on which modeling is completed. The moving speed may be set to a speed slower than the moving speed while not passing over the modeling layer. In this case, the three-dimensional modeling apparatus can suppress the drag / expansion due to the planarization by slowing the moving speed of the planarization unit on the modeling layer. Furthermore, the modeling time can be shortened by increasing the moving speed while not passing over the modeling layer.

  Further, the prediction information acquisition unit acquires at least information on a range in which the modeling layer is modeled, the planarization unit is a rotatable roller, and the planarization data creation unit includes the modeling that has been modeled. The rotation speed of the roller while passing over the layer may be set to a speed higher than the rotation speed while not passing over the modeling layer. In this case, the three-dimensional modeling apparatus can suppress the drag / expansion due to the planarization by increasing the rotation speed of the roller on the modeling layer. Furthermore, since the roller is not rotated unnecessarily at a position other than on the modeling layer, a three-dimensional model can be efficiently modeled.

  The elevating means adjusts the distance between the stage surface and the flattening means in a direction perpendicular to the stage surface, thereby reducing the thickness of the powder layer formed by the flattening means. Adjusting, the prediction information acquiring means acquires at least stacking order information that is information indicating a stacking order from the lowest layer among the plurality of powder layers to be stacked, and the three-dimensional modeling data creating means includes the You may provide the thickness data preparation means which produces the thickness data for controlling the said raising / lowering means according to the said lamination order information acquired by the prediction information acquisition means. In this case, since the drag amount and the expansion amount of the modeling layer differ depending on the stacking order of the powder layer on which the modeling layer is modeled, the three-dimensional modeling data creation device controls the thickness of the powder layer according to the stacking order. Thus, it is possible to cause the three-dimensional modeling apparatus to perform an appropriate operation according to the stacking order to suppress the influence of dragging and expansion.

  Further, the thickness data creating means may create the thickness data for making the thickness of the second powder layer from the lowest layer among the plurality of powder layers the largest. As the modeling layer is laminated, the total value of the weights of the modeling layer is increased, so that the drag amount and the expansion amount are reduced. Therefore, the modeling layer modeled in the lowermost layer becomes the modeling layer that is most susceptible to dragging and expansion. Furthermore, as the thickness of the powder layer is thicker, the drag amount and the expansion amount of the modeling layer existing in the powder layer immediately below decrease. Therefore, by increasing the thickness of the second powder layer from the bottom layer, it is possible to efficiently reduce the influence of the bottom layer that is most susceptible to dragging and expansion.

  In addition, the thickness data creating means may make only the thickness of the powder layer whose stacking order from the lowest layer indicated by the stacking order information is equal to or less than a threshold value is larger than the reference value. As the thickness of the powder layer is thicker, the drag amount and the expansion amount of the modeling layer existing in the powder layer immediately below decrease. On the other hand, the one where the thickness of a powder layer is thinner can model a precise three-dimensional model. Moreover, the amount of drag and the amount of expansion decrease as the modeling layer is stacked. The three-dimensional modeling data creation device can prevent the modeling accuracy from being lowered in the powder layer whose stacking order is larger than the threshold value by increasing only the thickness of the powder layer whose stacking order is equal to or less than the threshold value. Further, the data creation time can be shortened as compared with the case where the thicknesses of all the powder layers are adjusted.

  Further, the three-dimensional modeling data creation program according to the second aspect of the present invention is parallel to the stage surface of the stage with respect to the stage on which the three-dimensional modeling powder solidified by mixing with the modeling liquid is placed. The surface of the three-dimensional modeled powder placed on the stage is flattened by forming a powder layer by moving relative to each other, and the powder layer formed by the flattening unit By discharging the modeling liquid, a distance in a direction perpendicular to the stage surface between the discharging unit that forms a modeling layer that is a layer of a three-dimensional modeled object and the stage surface and the flattening unit is changed. A three-dimensional modeling data creation program for creating three-dimensional modeling data for controlling a three-dimensional modeling apparatus including lifting means from the three-dimensional data indicating the three-dimensional model to be modeled, and the modeling is completed Dragging, which is a phenomenon in which the modeling layer is dragged and shifted in the process of forming the powder layer on the upper surface of the modeling layer by the flattening means, and expansion, which is a phenomenon in which the modeling layer is expanded and expanded. A prediction information acquisition step for acquiring prediction information used for at least one of the predictions, and a three-dimensional modeling data generation step for generating the three-dimensional modeling data based on the prediction information acquired in the prediction information acquisition step. Instructions for causing the controller of the data creation device to execute are included.

  According to the three-dimensional modeling data creation program, the three-dimensional modeling apparatus can model a three-dimensional modeled object according to three-dimensional modeling data in which at least one of dragging and expansion generated when flattening the three-dimensional modeling powder is considered in advance. it can. Therefore, the three-dimensional modeling apparatus can suppress the influence of dragging and expansion, and can model a three-dimensional modeled object with an accurate shape.

1 is an external perspective view of a three-dimensional modeling apparatus 1. FIG. 2 is a perspective view of a modeling table 6. FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is the figure which looked at the internal structure of the three-dimensional modeling apparatus 1 from the right side surface. 3 is an enlarged perspective view of the vicinity of a powder supply unit 15 and a flattening roller 16. FIG. 3 is a block diagram showing an electrical configuration of the three-dimensional modeling apparatus 1. FIG. It is a figure which shows the data structure of three-dimensional modeling data. It is a flowchart of the three-dimensional modeling process which the three-dimensional modeling apparatus 1 performs. It is a block diagram which shows the electric constitution of PC100. It is explanatory drawing for demonstrating the aspect of a deformation | transformation of the three-dimensional molded item by planarization. It is a flowchart of the solid modeling data creation process which PC100 performs. It is a perspective view for demonstrating the projection area 106 of the three-dimensional molded item 105 with respect to the virtual plane 102 perpendicular | vertical to the planarization direction. It is a top view for demonstrating the symmetry of the three-dimensional molded item 105 with respect to the axis | shaft O parallel to a planarization direction. It is a flowchart of the thickness data creation process performed in a solid modeling data creation process. It is a figure which shows the data structure of the thickness setting table memorize | stored in HDD83 of PC100. It is a flowchart of the discharge data creation process performed in a solid modeling data creation process. 4 is a diagram illustrating a data configuration of a movement amount / compression amount setting table stored in an HDD 83 of the PC 100. FIG. It is a flowchart of the planarization data creation process performed in a solid modeling data creation process.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The drawings to be referred to are used for explaining technical features that can be adopted by the present invention. The configuration of the apparatus, the flowcharts of various processes, and the like described in the drawings are not intended to be limited to these, but are merely illustrative examples. The lower left side and the upper right side in FIGS. 1 and 2 are the front side and the back side of the three-dimensional modeling apparatus 1, respectively. The left-right direction and the up-down direction in FIGS. 1 and 2 are the left-right direction and the up-down direction of the three-dimensional modeling apparatus 1, respectively. The left side, the right side, the upper side, the lower side, the front side of the page, and the rear side of the page in FIG. 4 are the front side, the back side, the upper side, the lower side, the right side, and the left side, respectively. 5, the left side, the right side, the upper side, the lower side, the right front side of the page, and the left rear side of the page are the front side, the back side, the upper side, the lower side, the right side, and the left side of the three-dimensional modeling apparatus 1, respectively. The right side of the three-dimensional modeling apparatus 1 is the positive direction of the X coordinate, the rear is the positive direction of the Y coordinate, and the upper side is the positive direction of the Z coordinate.

  A schematic configuration of the three-dimensional modeling apparatus 1 will be described with reference to FIG. The three-dimensional modeling apparatus 1 can model a three-dimensional model by driving the head 20 and the like according to the three-dimensional modeling data (see FIG. 7). A personal computer (hereinafter, referred to as “PC”) 100 creates stereoscopic modeling data based on stereoscopic data indicating the three-dimensional shape of an object, and transmits it to the stereoscopic modeling apparatus 1 via a network or the like. The three-dimensional modeling apparatus 1 models a three-dimensional model according to the three-dimensional modeling data received from the PC 100. In addition, the three-dimensional modeling apparatus 1 can also acquire three-dimensional modeling data by acquiring three-dimensional data from another device and based on the acquired three-dimensional data.

  The three-dimensional modeling apparatus 1 mainly includes a base 2, a modeling table 6, a powder supply unit 15, a flattening roller 16, a head 20, a head cleaning mechanism 22, and a powder recovery unit 23. The base 2 is formed in a rectangular plate shape having the left-right direction (X-axis direction) as a longitudinal direction, and supports the entire three-dimensional modeling apparatus 1. The modeling table 6 includes a stage 11 on which a three-dimensional model is modeled. The powder supply unit 15 supplies the three-dimensional modeling powder onto the stage 11 of the modeling table 6. The flattening roller 16 flattens the upper surface of the three-dimensional modeled powder placed on the stage 11 to form a layer of three-dimensional modeled powder (hereinafter referred to as “powder layer”). The head 20 discharges the modeling liquid onto the powder layer formed on the stage 11. The head cleaning mechanism 22 wipes the discharge port of the head 20 and sucks the modeling liquid in close contact. The powder collection unit 23 collects excess three-dimensionally shaped powder (hereinafter referred to as “uncured powder”) around the three-dimensionally shaped object that remains without being solidified on the stage 11. Each configuration will be described below.

  The modeling table 6 will be described. As shown in FIG. 2, the modeling table 6 includes a base portion 7 that supports the modeling table 6 and a frame portion 9 that is supported on the upper portion of the base portion 7. A through-hole 8 that penetrates in the front-rear direction (Y-axis direction) is formed in each of the left and right sides of the base portion 7. As shown in FIG. 1, two rails 3 extending in parallel in the front-rear direction are provided in the approximate center of the base 2. The two rails 3 have a predetermined height from the upper surface of the base 2 by a support part 4 provided at the front side end of the base 2 and a support part (not shown) provided at the back side end. It is supported by. Each of the two rails 3 passes through each of the two through holes 8 formed in the base portion 7 of the modeling table 6. Furthermore, a modeling table longitudinal movement motor 41 (see FIG. 6) for moving the modeling table 6 back and forth is provided at the rear side end of the base 2. When the modeling table longitudinal movement motor 41 is driven, power is transmitted to the modeling table 6 via a carriage belt (not shown), and the modeling table 6 moves in the longitudinal direction (Y-axis direction) along the two rails 3. . That is, when the modeling table longitudinal movement motor 41 is driven, the powder supply unit 15, the flattening roller 16, and the head 20 move relative to the stage 11 of the modeling table 6 in the front-rear direction (direction parallel to the stage surface). To do.

  As shown in FIG. 2, the frame portion 9 has a substantially cubic box shape. The frame portion 9 includes a stage holding portion 10 that is a concave portion having a rectangular shape in plan view with an upper surface opened. Inside the stage holding unit 10, a stage 11 on which a three-dimensional model is modeled is held so that it can be moved up and down. The stage 11 is formed in a rectangular shape in plan view so as to be in contact with the inner peripheral surface of the stage holding unit 10, and the upper surface of the stage 11 is kept horizontal. In other words, the frame portion 9 is in contact with the side surface of the stage 11 and surrounds the outer periphery of the lifting range of the stage 11. Connected to the right side surface of the frame portion 9 is a collection path 12 for guiding uncured powder from the stage holding unit 10 to the powder collection unit 23 (see FIG. 1). On the back side of the stage holding unit 10, there is provided a powder dropping port 13 that is a rectangular recess in plan view with an open upper surface. When the powder layer is formed, surplus powder accumulated by the flattening roller 16 falls on the powder dropping port 13. The surplus powder that has fallen to the powder dropping port 13 is returned by the operator into the powder supply unit 15 (see FIGS. 1, 4, and 5) located above the modeling table 6. However, the three-dimensional modeling apparatus 1 may collect the surplus powder that has fallen into the powder dropping port 13 by suction or the like and automatically return it to the powder supply unit 15.

  As shown in FIG. 3, the stage 11 includes an upper stage 51 and a lower stage 52. The upper stage 51 is a rectangular plate-like member and is disposed horizontally. The upper stage 51 is provided with a plurality of holes 71 (see FIG. 2) penetrating in the thickness direction. The lower stage 52 is a plate-like member having substantially the same shape as the upper stage 51, and is disposed below the upper stage 51 in parallel with the upper stage 51. Similarly to the upper stage 51, the lower stage 52 is also provided with a plurality of holes (not shown). However, the upper stage 51 and the lower stage 52 are formed so that the position of the hole 71 provided in the upper stage 51 and the position of the hole provided in the lower stage 52 do not overlap in plan view. Therefore, when the three-dimensional modeling powder is placed on the upper stage 51, the three-dimensional modeling powder is deposited on the upper surface of the upper stage 51 at a position where the hole 71 is not provided. At the position where the hole 71 is provided, the three-dimensional modeling powder falls from the hole 71 to the lower stage 52. However, the hole of the lower stage 52 is not formed at the dropping point. Therefore, the three-dimensional modeling powder that has dropped from the upper stage 51 is deposited on the upper surface of the lower stage 52. As a result, the three-dimensional modeling powder is deposited on the stage 11.

  Below the lower stage 52, a tray 53 that supports the upper stage 51 and the lower stage 52 is provided. The tray 53 is formed in a substantially rectangular shape in plan view so as to cover the entire lower portion of the lower stage 52. A guide port 55 that guides uncured powder dropped from the lower stage 52 to the collection path 12 is formed at the approximate center in the front-rear direction near the right end of the tray 53. The tray 53 is inclined so that the height decreases as it approaches the guide port 55. A recovery port 65 that is an inlet of the recovery path 12 is disposed vertically below the guide port 55.

  A ball screw 57 is connected to the lower center of the tray 53. The ball screw 57 extends vertically downward from the tray 53 and is attached to a nut (not shown). A stage elevating motor 42 (see FIG. 6), which is a step motor for rotating the ball screw 57, is provided below the modeling table 6. When the stage elevating motor 42 is driven, the ball screw 57 rotates and moves up and down, and the tray 53 connected to the ball screw 57 moves up and down. As a result, the stage 11 supported by the tray 53 moves up and down. A vibration motor 46 (see FIG. 6) for vibrating the stage 11 is disposed on the modeling table 6.

  The three-dimensional modeling apparatus 1 positions the stage 11 at a position higher than the recovery port 65 when modeling a three-dimensional model. Specifically, the three-dimensional modeling apparatus 1 models a three-dimensional modeled object while gradually lowering the stage 11 from the upper part of the lifting range. When the modeling of the three-dimensional model is completed, the three-dimensional modeling apparatus 1 lowers the stage 11 to the lower end of the lifting range, and brings the guide port 55 close to the vicinity of the recovery port 65. Next, driving of the vibration motor 46 is started to vibrate the stage 11. When the stage 11 vibrates, the uncured powder on the stage 11 falls on the tray 53 and is collected through the guide port 55 and the collection port 65.

  The powder supply unit 15 will be described. As shown in FIGS. 4 and 5, the powder supply unit 15 is formed in a box shape whose width in the front-rear direction gradually increases upward, and accommodates the three-dimensionally shaped powder therein. The powder supply part 15 is being fixed to the left side surface of the powder collection | recovery part 23 (refer FIG. 1) so that it may be located above the modeling stand 6. FIG. On the lower surface of the powder supply unit 15, a supply port (not shown) that is an opening whose longitudinal direction is the left-right direction is formed. The supply port is formed with a width equal to or greater than the width in the left-right direction of the stage 11 so that the three-dimensionally shaped powder can be supplied to the entire region extending linearly in the left-right direction (X-axis direction) on the stage 11. The supply port is provided with a shutter (not shown) that opens and closes the supply port. The three-dimensional modeling apparatus 1 supplies the three-dimensional modeling powder onto the stage 11 by controlling the opening and closing of the shutter by the powder supply motor 44 (see FIG. 6).

  The flattening roller 16 will be described. The flattening roller 16 is provided to flatten the upper surface of the three-dimensional modeling powder supplied on the stage 11 to form a powder layer. As shown in FIGS. 4 and 5, the rotating shaft 17 of the flattening roller 16 extends in a direction (left-right direction) intersecting the moving direction of the modeling table 6 in a state parallel to the upper surface of the stage 11. The rotation shaft 17 is connected to a roller rotation motor 43 (see FIG. 6) disposed in the powder recovery unit 23 (see FIG. 1). When the roller rotation motor 43 is driven, the flattening roller 16 rotates in the direction of the arrow shown in FIG. 5 (the counterclockwise direction when viewed from the right side). When forming the powder layer, the three-dimensional modeling apparatus 1 moves the modeling table 6 from the rear to the front while rotating the flattening roller 16 with the shutter of the powder supply unit 15 opened (negative Y-axis). Move in the direction). As a result, the upper surface of the three-dimensionally shaped powder placed on the stage 11 (see FIGS. 2 and 3) is flattened by the flattening roller 16. The surplus powder accumulated on the back side of the flattening roller 16 falls to the powder drop opening 13 formed on the back side of the modeling table 6.

  As shown in FIGS. 4 and 5, a plate-like blade 18 is fixed to the front surface of the powder supply unit 15. The blade 18 is provided to remove the three-dimensional modeling powder attached to the flattening roller 16. The blade 18 extends obliquely downward and forward from the front wall surface of the powder supply unit 15 and is in contact with the back side of the flattening roller 16 without a gap. As shown in FIG. 5, the position P where the blade 18 contacts in the flattening roller 16 is adjusted to a height equal to or lower than the height H of the rotating shaft 17. Therefore, the three-dimensionally shaped powder is easily peeled off from the surface of the flattening roller 16 without being deposited between the blade 18 and the flattening roller 16. Further, the plate surface of the blade 18 blocks between the space on the front side and the space on the back side of the flattening roller 16. Therefore, the blade 18 can prevent the three-dimensionally shaped powder on the back side of the flattening roller 16 from scattering to the front side. Therefore, the upper surface of the powder layer formed by the flattening roller 16 is kept flat. The possibility that the scattered three-dimensional shaped powder adheres to the head 20 is also reduced.

  The head 20 will be described. Although not shown, the head 20 includes a cyan head, a magenta head, a yellow head, a black head, and a clear head. A plurality of tanks containing each of a cyan modeling liquid, a magenta modeling liquid, a yellow modeling liquid, a black modeling liquid, and a clear modeling liquid are mounted inside the left body portion 25 (see FIG. 1) of the three-dimensional modeling apparatus 1. ing. Each of the heads of each color included in the head 20 is connected to a tank containing a modeling liquid of a corresponding color by a flexible tube (not shown). The head 20 discharges the modeling liquid of each color onto the powder layer under the control of the CPU 30 (see FIG. 6). In addition, the kind of modeling liquid to discharge can be changed. For example, four types of modeling liquid may be discharged by a cyan head, a magenta head, a yellow head, and a clear head. In this case, black is reproduced by mixing cyan, magenta, and yellow. A head that ejects four types of liquid is generally used in a normal printing apparatus that ejects cyan, magenta, yellow, and black inks. Of the heads of a normal printing apparatus, if a head that discharges black ink is used for the clear modeling liquid, the head of the printing apparatus can be transferred to the three-dimensional modeling apparatus 1 as it is.

  As shown in FIG. 1, a guide rail 21 for guiding the movement of the head 20 in the left-right direction is provided above the modeling table 6 and in front of the powder supply unit 15. The guide rail 21 extends horizontally straight from the right side surface of the left body portion 25 of the three-dimensional modeling apparatus 1 to the right side, and is connected to the left side surface of the powder recovery unit 23. The guide rail 21 penetrates the head 20 in the left-right direction, and the head 20 can move left and right along the guide rail 21. A head moving motor 45 (see FIG. 6) for moving the head 20 is provided on the left body portion 25 of the three-dimensional modeling apparatus 1. When the head moving motor 45 is driven, power is transmitted to the head 20 via a carriage belt (not shown), and the head 20 moves in the left-right direction (X-axis direction).

  The head cleaning mechanism 22 wipes (wipes) the nozzle surface below the head 20, adheres closely, and performs suction until the modeling liquid of each color reaches the nozzle. The head cleaning mechanism 22 covers the nozzle surface of the head 20 when the modeling liquid is not discharged, and prevents the modeling liquid from drying.

  As shown in FIG. 1, the powder recovery unit 23 is disposed between the modeling table 6 and the right body unit 26. The powder recovery unit 23 includes a powder suction pump 48 (see FIG. 6) for sucking uncured powder in the stage holding unit 10 (see FIGS. 2 and 3) of the modeling table 6. When the powder suction pump 48 starts suction, the uncured powder in the stage holding unit 10 passes through the recovery path 12 (see FIGS. 2, 3, and 5) and the powder recovery unit 23, and the powder supply unit. Returned to 15.

  An operation panel 27 is provided in front of the right body portion 26 of the three-dimensional modeling apparatus 1. The operation panel 27 has various operation keys and a display unit. The operator inputs an operation instruction to the three-dimensional modeling apparatus 1 by operating the operation key while looking at the display unit.

  The electrical configuration of the three-dimensional modeling apparatus 1 will be described with reference to FIG. The three-dimensional modeling apparatus 1 includes a CPU 30 that controls the three-dimensional modeling apparatus 1. A RAM 31, a ROM 32, a motor drive unit 33, a head drive unit 35, a head cleaning mechanism 22, a powder suction pump 48, an operation panel 27, and an external communication I / F 37 are connected to the CPU 30 via a bus 39. .

  The RAM 31 temporarily stores various data such as three-dimensional modeling data received from the PC 100. The ROM 32 stores a control program for controlling the operation of the three-dimensional modeling apparatus 1, an initial value, and the like. The motor drive unit 33 controls the operations of the modeling table back-and-forth movement motor 41, the stage elevating motor 42, the roller rotation motor 43, the powder supply motor 44, the head moving motor 45, and the vibration motor 46. The head driving unit 35 is connected to the head 20 and drives a piezoelectric element provided in each ejection channel of the head 20. The external communication I / F 37 connects the three-dimensional modeling apparatus 1 to an external device such as the PC 100. The three-dimensional modeling apparatus 1 can also acquire data from other devices (for example, a USB memory, a server, etc.) via a USB interface, the Internet, or the like.

  With reference to FIG. 7, the data structure of the solid modeling data will be described. The three-dimensional modeling data is data for controlling the operation of the three-dimensional modeling apparatus 1. The three-dimensional modeling apparatus 1 acquires the three-dimensional modeling data, stores it in the RAM 31, and operates each unit according to the stored data. As shown in FIG. 7, the three-dimensional modeling data is created for each of a plurality of layers (powder layer and modeling layer) to be stacked. The data of each layer is given the stacking order N from the lowest layer. The data for each layer includes ejection data, planarization data, and thickness data.

  The ejection data is data for driving the modeling table longitudinal movement motor 41, the head moving motor 45, and the head 20 (see FIG. 6), and controls ejection of the modeling liquid from the head 20. Specifically, the ejection data includes information on coordinates (X, Y) and information indicating whether or not each color of the modeling liquid is ejected to the dots indicated by the coordinates information. In FIG. 7, “1” indicates ejection, “0” indicates non-ejection, and “−” indicates that none of the modeling liquid is ejected (dots outside the modeling range).

  The flattening data is data for driving the modeling table back-and-forth motion motor 41 and the roller rotation motor 43 (see FIG. 6), and controls the operation of flattening the upper surface of the three-dimensional modeling powder. Specifically, the flattening data includes information on moving speed and information on rotational speed. The moving speed is a speed of relative movement of the flattening roller 16 with respect to the stage 11. The three-dimensional modeling apparatus 1 of the present embodiment moves the leveling roller 16 relative to the stage 11 by moving the modeling table 6 that holds the stage 11. However, when the stage 11 is fixed and the flattening roller 16 is moved, the moving speed is the speed of the flattening roller 16. The rotation speed is the rotation speed of the flattening roller 16 during the flattening step, and in this embodiment, the unit is represented by rps (number of times / second).

  The thickness data is data for driving the stage elevating motor 42 (see FIG. 6). Although details will be described later, when forming a powder layer, the three-dimensional modeling apparatus 1 adjusts the thickness of the powder layer in the Z-axis direction by adjusting the descending amount of the stage 11 according to the thickness data. That is, the thickness of the powder layer and the modeling layer is determined by the thickness data.

  With reference to FIG. 8, the three-dimensional modeling process which the three-dimensional modeling apparatus 1 performs is demonstrated. As described above, the ROM 32 of the three-dimensional modeling apparatus 1 stores a control program for controlling the operation of the three-dimensional modeling apparatus 1. CPU30 of the three-dimensional modeling apparatus 1 will perform the three-dimensional modeling process shown in FIG. 8 according to a control program, if the start instruction | indication of modeling is input.

  First, initialization processing is executed (S1). In the initialization processing, the lower surface of the head 20 is wiped by the head cleaning mechanism 22 and suction is performed until the modeling liquid reaches the nozzle. By the suction, the head 20 can discharge the modeling liquid. Further, the height of the upper surface of the stage 11 is moved to the vicinity of the upper end portion of the modeling table 6 to form a powder layer that serves as a foundation for performing the three-dimensional modeling. Specifically, the height of the upper surface of the stage 11 is adjusted to about 3 to 10 mm below the upper end of the modeling table 6, and the supply and flattening of the three-dimensional modeling powder are repeated, so that the height is about 3 to 10 mm. A flattened powder layer having a thickness is formed as a base. By forming a powder layer as a base in advance, the upper surface of the powder layer laminated on the upper part can be an accurate flat surface. In the initialization process, data stored in the RAM 31 is temporarily deleted.

  It is determined whether or not the three-dimensional modeling data (see FIG. 7) is input from the PC 100 (S2). If the 3D modeling data is not input (S2: NO), the determination of S2 is repeated. When the three-dimensional modeling data is input (S2: YES), among the plurality of layers (powder layer and modeling layer), the value of the stacking order N for specifying the processing target layer is “1” indicating the lowest layer. (S3).

  The Nth layer data in the three-dimensional modeling data is read (S4). The stage raising / lowering motor 42 is driven, and the height of the upper surface of the stage 11 is lowered by the thickness indicated by the thickness data of the Nth layer (S5). The solid modeling powder is supplied to the stage 11, the upper surface is flattened, and a powder layer is formed (S6). Specifically, the powder supply motor 44 is driven to start the supply of the three-dimensionally shaped powder onto the stage 11. The roller rotation motor 43 is driven to rotate the flattening roller 16 at a rotation speed indicated by the Nth layer flattening data. The modeling table back-and-forth moving motor 41 is driven, and the modeling table 6 is moved forward at the moving speed indicated by the Nth layer flattening data. When the powder layer is formed, the modeling table longitudinal movement motor 41 and the head moving motor 45 are driven, and the head 20 is relatively moved to the initial position of the molding region. In accordance with the ejection data of the Nth layer, the relative movement and ejection control of the head 20 are executed, and the modeling liquid is ejected from the head 20 (S7). By the processing of S4 to S7, the Nth modeling layer is formed.

  It is determined whether or not modeling of the three-dimensional model is completed (S9). If not completed (S9: NO), the value of the stacking order N for specifying the processing target layer is incremented ("1" is added), and the layer one level higher is set as the processing target layer. (S11). The process returns to S4, and the next powder layer and modeling layer are formed (S4 to S7). When the modeling is completed (S9: YES), the stage 11 is lowered, the vibration motor 46 and the powder suction pump 48 are driven, and uncured powder is collected (S12). The three-dimensional modeling process ends.

  The electrical configuration of the PC 100 will be described with reference to FIG. The PC 100 includes a CPU 80 that controls the PC 100. The CPU 80 includes a RAM 81, a ROM 82, a hard disk drive (hereinafter referred to as “HDD”) 83, a display control unit 84, an operation processing unit 85, a CD-ROM drive 86, and an external communication I / F 87 via a bus 89. It is connected.

  The RAM 81 temporarily stores various information. The ROM 82 stores a program such as BIOS executed by the CPU 80. The HDD 83 is a nonvolatile storage device, and stores a 3D modeling data creation program, 3D data, 3D modeling data (see FIG. 7), and the like. The display control unit 84 controls the display on the monitor 91. The operation processing unit 85 is connected to a keyboard 92 and a mouse 93 for a user to perform an operation input, and detects the operation input. A CD-ROM 94 that is a storage medium is inserted into the CD-ROM drive 86. Data stored in the CD-ROM 94 is read by the CD-ROM drive 86. The PC 100 acquires the 3D modeling data creation program and the like according to the present invention via the CD-ROM 94 and the Internet, and stores them in the HDD 83. The external communication I / F 87 connects the PC 100 to an external device such as the three-dimensional modeling apparatus 1.

  With reference to FIG. 10, the deformation | transformation aspect of the three-dimensional molded item produced by planarizing three-dimensional molded powder is demonstrated. FIG. 10 illustrates a case where circular flat plate-shaped modeling layers having the same diameter are stacked vertically. In this case, if deformation due to flattening does not occur, a cylindrical three-dimensional structure is formed as shown in the upper perspective view of FIG. However, when the flattening means such as the flattening roller 16 is moved relative to the stage surface of the stage 11 in parallel, if the modeling layer that has already been modeled is included in the lower powder layer, the modeling is performed. Deforms when force is applied to the layer.

  Deformation includes dragging and expansion. Dragging is a phenomenon in which the modeling layer included in the lower powder layer is dragged in the flattening direction and the position is shifted. When only dragging occurs, the shape of the modeling layer itself does not change, but the position of the modeling layer deviates from a predetermined position. As a result, the three-dimensional model is deformed. The expansion is a phenomenon in which a modeling layer included in the lower powder layer is expanded in the flattening direction. When only the expansion occurs, the position of the upstream end (right side in FIG. 10) in the planarization direction of the modeling layer does not change, but the shape of the modeling layer itself is stretched in the planarization direction. As a result, the three-dimensional model is deformed. In the three-dimensional model, only one of dragging and expansion may occur, but both dragging and expansion may occur. When both drag and expansion occur, the amount of deformation of the three-dimensional structure increases as compared with the case where either one of the deformations occurs. The “flattening direction” is a direction in which the flattening means (flattening roller 16) moves relative to the stage surface of the stage 11 on which the three-dimensional modeling powder is placed. For example, even when the stage 11 is moved forward with the flattening means fixed, or when the stage 11 is fixed and the flattening means is moved backward, the flattening direction is both backward.

  The total weight of the layered modeling layers increases as the layers are stacked. As the total weight of the modeling layer increases, drag and expansion are less likely to occur. Therefore, as shown in FIG. 10, the earlier the stacking order (the lower the position of the modeling layer), the more the deformation amount due to dragging (hereinafter referred to as “the dragging amount”) and the deformation amount due to expansion (hereinafter, “ "Expansion amount") increases. When the stacking order becomes larger than the threshold value, the drag amount and the expansion amount are almost negligible. In the example shown in FIG. 10, the threshold of the stacking order in which dragging and expansion can occur is “2”, and when the stacking order is greater than “2”, the dragging amount and the expansion amount can be ignored. However, the threshold value varies depending on the modeling conditions such as the type of the three-dimensional modeling powder, the thickness of the modeling layer, the amount of the modeling liquid to be discharged, the moving speed / rotational speed of the flattening roller 16, and the like. Needless to say, the drag amount and the expansion amount are affected by the modeling conditions. The PC 100 can create the three-dimensional modeling data in consideration of the occurrence of dragging and expansion in advance. Hereinafter, processing executed by the PC 100 will be described.

  With reference to FIGS. 11 to 18, the three-dimensional modeling data creation process executed by the PC 100 will be described. As described above, the solid modeling data creation program is stored in the HDD 83 of the PC 100. CPU80 of PC100 will perform the solid modeling data creation process shown in FIG. 11 according to a solid modeling data creation program, if the creation instruction of solid modeling data is input.

  First, three-dimensional data indicating the three-dimensional shape of the object designated by the user is acquired (S21). The flattening direction (that is, the relative movement direction of the flattening roller 16 with respect to the stage 11) is acquired (S22). In the three-dimensional modeling apparatus 1 of the present embodiment, when flattening is performed, the modeling table 6 is moved forward with the flattening roller 16 fixed. Therefore, the flattening direction is always backward. However, when the three-dimensional modeling apparatus 1 can perform flattening in a plurality of flattening directions, the CPU 80 acquires the flattening direction of the flattening process that is actually executed by the three-dimensional modeling apparatus 1. Next, information of a range in which each of the plurality of modeling layers is modeled is acquired (S23). In S23, information of a range occupied by a portion corresponding to each modeling layer (three-dimensional range occupied by a three-dimensional modeled object to be modeled) among objects indicated by the three-dimensional data is acquired as information on the modeling range. .

  Next, an arrangement angle of the three-dimensional modeled object on the stage 11 is set (S24 to S27). First, as shown in FIG. 12, the three-dimensional object 105 is arranged on the stage 11 so that the projection area 106 of the three-dimensional object 105 with respect to the virtual plane 102 perpendicular to the flattening direction of the flattening roller 16 is minimized. An angle is set (S24). In the example illustrated in FIG. 12, the shape of the three-dimensional structure 105 is a rectangular parallelepiped shape having a long direction and a short direction. In this case, in the three-dimensional structure 105A arranged so that the longitudinal direction is perpendicular to the flattening direction, the projected area 106A with respect to the virtual plane 102 becomes large. On the other hand, in the three-dimensional structure 105B arranged so that the longitudinal direction is parallel to the flattening direction, the projection area 106B with respect to the virtual plane 102 is minimized. Therefore, in the example shown in FIG. 12, the CPU 80 sets the arrangement angle of the three-dimensional structure 105B so that the longitudinal direction is parallel to the flattening direction. By setting the arrangement angle of the three-dimensional structure 105 so that the projected area 106 is minimized, the drag amount and the expansion amount are minimized. [Evaluation Test 1] for confirming this effect will be described later.

  It is determined whether or not there are a plurality of arrangement angles at which the projected area 106 with respect to the virtual plane 102 is minimum (S26). Here, when the arrangement angle is rotated by 180 degrees around an axis parallel to the virtual plane 102, the projected area 106 is always the same. The two arrangement angles in this case are processed as the same (one) in the processing of S26. If there is one arrangement angle set by the process of S24 (S26: NO), the process proceeds to S28 as it is.

  If there are a plurality of arrangement angles set by the process of S24 (S26: YES), as shown in FIG. 13, a three-dimensionally shaped object with respect to the axis O extending in the flattening direction among the set arrangement angles. The arrangement angle at which the modeling range 105 is closest to symmetry in plan view is employed (S27). In the example shown in FIG. 13, the shape of the three-dimensional structure 105 is substantially U-shaped in plan view. The projected area 106 with respect to the virtual plane 102 (see FIG. 12) has no difference between the pattern 1 and the pattern 2 in FIG. However, the three-dimensional structure 105 </ b> C arranged in the pattern 1 is asymmetric in plan view with respect to the axis O. In this case, if dragging and expansion occur, dragging and expansion appear in the flattening direction, so that the deformation becomes asymmetric and the appearance of the three-dimensional structure 105C is greatly deteriorated. On the other hand, in the pattern 2 in which the arrangement angle of the pattern 1 is rotated 90 degrees counterclockwise, the three-dimensional structure 105D is symmetric with respect to the axis O in plan view. In this case, even if dragging and expansion occur, the deformation appears symmetrically, so that appearance deterioration is suppressed. Also, when the deformation amount is predicted, if the three-dimensional structure 105D is arranged symmetrically with respect to the axis O, the deformation amount can be predicted with about half the calculation amount.

  Next, among the plurality of layers (powder layer and modeling layer), the value of the stacking order N for specifying the layer for creating data is set to “1” indicating the lowest layer (S28). Three-dimensional modeling data in the stacking order N is created (S31 to S33). In the thickness data creation process (S31), thickness data for determining the thickness of the layers (powder layer and modeling layer) is created. In the discharge data creation process (S32), discharge data for controlling the discharge of the modeling liquid is created. In the flattening data creation process (S33), flattening data for controlling the flattening of the three-dimensional modeling powder is created. Hereinafter, the processing of S31 to S33 will be described in detail.

  The thickness data creation process (S31) will be described with reference to FIGS. In the thickness data creation process, the thickness of the powder layer located on the modeling layer that is likely to be dragged and expanded is set to be thick. If the thickness of the powder layer is large, dragging and expansion are less likely to occur in the next modeling layer. [Evaluation Test 2] for confirming this effect will be described later. On the other hand, the thickness of the powder layer on the modeling layer that hardly causes dragging and expansion is set thin. As a result, a thin modeling layer is finely laminated at a portion where dragging and expansion hardly occur, and the three-dimensional model 105 is accurately modeled.

  First, it is determined whether or not the value of the stacking order N is equal to or less than a threshold value (“5” in the present embodiment) (S41). If it is equal to or less than the threshold (S41: YES), the thickness setting table (see FIG. 15) stored in the HDD 83 is referred to, the thickness corresponding to the stacking order N is set (S43), and the process is three-dimensional modeling data creation Return to processing. As described above, drag and expansion tend to occur as the stacking order N is earlier (smaller). Therefore, in the thickness setting table shown in FIG. 15, the thickness of the powder layer in the layer (N = 2) above the lowest layer (N = 1) where dragging and expansion are most likely to occur is set to the largest value. ing. The thickness becomes gradually smaller as the value of the stacking order N becomes larger than 2. Since there is no modeling layer under the lowest layer (N = 1), the thickness of the lowest layer is set to a reference value. Note that the reference value is the thickness of a normal powder layer that is applied when dragging and expansion do not occur in the lower layer, and is thin enough to ensure the precise shape of the three-dimensional structure 105. If the value of the stacking order N is larger than the threshold value (S41: NO), the drag amount and the expansion amount generated in the next modeling layer are negligibly small (or drag and deformation do not occur). Therefore, the thickness of the powder layer is set to the reference value (100 μm in this embodiment) (S42), and the process returns to the three-dimensional modeling data creation process. Next, a discharge data creation process (S32, see FIG. 11) is executed.

  The discharge data creation process (S32) will be described with reference to FIGS. In the ejection data creation process, the drag position and the ejection range of the modeling liquid are set in consideration of dragging and expansion that may occur in the Nth modeling layer. That is, by dragging and expanding, the ejection data is created so that the modeling position and modeling range (shape) of the modeling layer are the correct position and range.

  First, information on the modeling position and modeling range of the Nth modeling layer to be modeled is acquired from the three-dimensional data of the object to be modeled (S51). It is determined whether or not the value of the stacking order N is equal to or less than a threshold value (“4” in the present embodiment) (S52). The threshold value determined in S52 may be the same value as the threshold value (S41, see FIG. 14) for setting the thickness of the powder layer, or may be a different value. As described above, if the value of the stacking order N is larger than the threshold value (S52: NO), the drag amount and the expansion amount can be ignored (or not deformed). Therefore, the modeling position and modeling range indicated by the information acquired in S51 are directly set as the modeling liquid discharge position and the discharge range for the Nth powder layer. Discharge data for discharging the modeling liquid to the discharge position and discharge range is created (S55), and the process returns to the three-dimensional modeling data creation process.

  If the value of the stacking order N is equal to or less than the threshold value (S52: YES), the movement amount / compression amount setting table shown in FIG. 17 is referred to. In the present embodiment, the drag amount and the expansion amount of each modeling layer are measured in advance by experiments, and the movement amount / compression amount setting table shown in FIG. 17 is created and stored based on the measured values. The movement amount is an amount by which the modeling position indicated by the information acquired in S51 is shifted in the direction opposite to the flattening direction. The compression amount is an amount (unit:%) for compressing the modeling range indicated by the information acquired in S51 in the direction opposite to the flattening direction. The smaller the stacking order N, the larger the drag amount and the expansion amount. Accordingly, in the movement amount / compression amount setting table, each value is set so that the movement amount and the compression amount increase as the stacking order N decreases.

  Note that the movement amount / compression amount setting table shown in FIG. 17 and the thickness setting table shown in FIG. 15 include the type of three-dimensional modeling powder, the thickness of the modeling layer, the amount of modeling liquid to be ejected, the leveling roller 16 A plurality are provided according to modeling conditions such as moving speed and rotational speed. Therefore, the three-dimensional modeling apparatus 1 can execute an optimum operation according to the modeling conditions.

  The CPU 80 sets the discharge position by shifting the modeling position indicated by the information acquired in S51 by the movement amount corresponding to the stacking order N in the direction opposite to the flattening direction (S53). The ejection range is set by compressing the modeling range indicated by the information acquired in S51 in the direction opposite to the flattening direction by the compression amount corresponding to the stacking order N (S54). The CPU 80 creates discharge data for discharging the modeling liquid to the set discharge position and discharge range based on the three-dimensional data (S55). The process returns to the three-dimensional modeling data creation process. Next, a flattened data creation process (S33, see FIG. 11) is executed.

  With reference to FIG. 18, the flattened data creation process (S33) will be described. In the flattening data creation process, flattening data for controlling the operation of flattening the three-dimensional modeling powder is created. In the flattening step, as the relative moving speed of the flattening roller 16 with respect to the stage 11 increases, the time required for modeling can be shortened, but the drag amount and the expansion amount increase. Further, the smaller the rotational speed of the flattening roller 16, the more energy can be saved, but the drag amount and the expansion amount become larger (see [Evaluation Test 3] described later). Therefore, the CPU 80 sets the relative moving speed and rotational speed of the flattening roller 16 depending on whether or not the modeling layer exists in the lower layer. Thereby, the efficiency of modeling and time reduction are implement | achieved, suppressing generation | occurrence | production of drag and expansion | swelling.

  First, it is determined whether or not the value of the stacking order N is equal to or less than a threshold value (S61). The threshold value may be set appropriately according to the experimental results, modeling conditions, and the like. If the value of the stacking order N is larger than the threshold value (S61: NO), the occurrence of dragging and expansion can be ignored. Therefore, the relative moving speed of the flattening roller 16 is set to a high speed (70 mm / s in this embodiment) (S62). The rotation speed of the flattening roller 16 is set to a low speed (5 rps in this embodiment) (S63). The process returns to the three-dimensional modeling data creation process.

  If the value of the stacking order N is equal to or less than the threshold value (S61: YES), information on the modeling position and modeling range of layers below the Nth layer (all layers up to the (N-1) th layer) is acquired ( S65). The modeling of the modeling layer below the Nth layer has already been completed when the Nth layer is modeled. Therefore, the modeling range of all layers below the Nth layer is referred to as “modeling completion range”. The CPU 80 sets the relative moving speed of the flattening roller 16 while passing vertically above the modeling completion range to a low speed (50 mm / s in this embodiment) (S66). The moving speed while passing vertically above the range other than the modeling completion range is set to a high speed (S67). The CPU 80 sets the rotation speed of the flattening roller 16 while passing vertically above the modeling completion range to a high speed (8 rps in the present embodiment) (S68). The rotational speed while passing vertically above the range other than the modeling completion range is set to a low speed (S69). The process returns to the three-dimensional modeling data creation process.

  Returning to the description of FIG. When the creation of the three-dimensional modeling data for one layer (S31 to S33) is completed, it is determined whether or not the three-dimensional modeling data for all layers is completed (S34). If not completed (S34: NO), the value of the stacking order N is incremented ("1" is added) (S35), the process returns to S31, and the three-dimensional modeling data of the layer one level above is created. . When the three-dimensional modeling data of all layers is completed (S34: YES), the generated three-dimensional modeling data is output to the three-dimensional modeling apparatus 1 (S37), and the process ends.

[Evaluation Test 1]
In order to confirm the relationship between the projected area 106 of the three-dimensional structure 105 with respect to the virtual plane 102 (see FIG. 12) perpendicular to the flattening direction, the drag amount, and the expansion amount, the evaluation test 1 was performed. The three-dimensional modeling powder used in the evaluation test 1 contains 25 vol% polyvinyl alcohol (manufactured by Kuraray Co., Ltd., product name “Kuraray Poval”) and 75 vol% calcium carbonate (CaCO ₃ ). The particle diameters of polyvinyl alcohol and calcium carbonate are both 25 to 53 μm. The coating density of the modeling liquid was 3.01 mg / cm ² . The thickness of the powder layer was 100 μm, and 30 modeling layers were laminated. The flattening speed was 90 mm / s, and the rotating speed of the flattening roller 16 was 5 rps.

In the evaluation test 1, two three-dimensionally shaped objects 105 having the same shape were modeled at different arrangement angles, and the sum of the drag amount and the expansion amount was calculated and compared. The modeled three-dimensional model 105 is a plate-like member having a length of 40 mm, a width of 10 mm, and a height of 3 mm. Since one three-dimensional model 105 was arranged so that the longitudinal direction was perpendicular to the flattening direction, the projected area 106 with respect to the virtual plane 102 was 120 mm ² . Since the other three-dimensional model 105 was arranged so that the longitudinal direction was parallel to the planarization direction, the projection area 106 was 30 mm ² . Table 1 below shows the sum of the drag amount and the expansion amount of each three-dimensional modeled object 105 that has been modeled.

As shown in Table 1, when the projected area 106 on the virtual plane 102 is 120 mm ² , the sum of the drag amount and the expansion amount is 1.7 mm. On the other hand, when the projection area 106 is 30 mm ² , the sum of the drag amount and the expansion amount is 0.6 mm. As described above, it was confirmed by the evaluation test 1 that the drag amount and the expansion amount are reduced by reducing the projection area 106 with respect to the virtual plane 102.

[Evaluation Test 2]
In order to confirm the relationship between the thickness of the powder layer and the drag and expansion generated in the modeling layer included in the powder layer one level below, an evaluation test 2 was performed. The three-dimensional modeling powder used in the evaluation test 2 is the same as the three-dimensional modeling powder used in the evaluation test 1 described above. The coating density of the modeling liquid was 3.01 mg / cm ² . The flattening speed was 50 mm / s, and the rotation speed of the flattening roller 16 was 5 rps. The shape of the three-dimensional modeled object 105 is cylindrical, and the horizontal cross section (circular shape) has a diameter of 40 mm and a height of 3 mm.

  In the evaluation test 2, the three-dimensional model 105 having the same shape is modeled by changing the thickness of the layers (powder layer and modeling layer) and the number of modeling layers to be stacked, and the sum of the drag amount and the expansion amount is obtained. Were calculated and compared. One three-dimensional model 105 was modeled by setting the thickness of each layer to 100 μm and laminating 30 modeling layers. The other three-dimensional model 105 was modeled by setting the thickness of each layer to 200 μm and laminating 15 modeling layers. Table 2 below shows the sum of the drag amount and the expansion amount of each three-dimensional modeled object 105 that has been modeled.

  As shown in Table 2, when the thickness of the layer was 100 μm, the sum of the drag amount and the expansion amount was 1.7 mm. On the other hand, when the thickness of the layer was 200 μm, the sum of the drag amount and the expansion amount was 0 mm. As described above, it was confirmed by the evaluation test 2 that the drag amount and the expansion amount are reduced by increasing the thickness of the layer.

[Evaluation Test 3]
In order to confirm the relationship between the flattening speed and dragging / expanding, and the relationship between the rotation speed of the flattening roller 16 and dragging / expanding, an evaluation test 3 was performed. The three-dimensional modeling powder used in the evaluation test 3 is the same as the three-dimensional modeling powder used in the evaluation test 1 and the evaluation test 2 described above. The coating density of the modeling liquid was 3.01 mg / cm ² . The thickness of the powder layer was 100 μm, and 30 modeling layers were laminated. The shape of the three-dimensional modeled object 105 is cylindrical, and the horizontal cross section (circular shape) has a diameter of 40 mm and a height of 3 mm.

  In the evaluation test 3, five three-dimensionally shaped objects 105 having the same shape are formed by changing at least one of the relative moving speed (flattening speed) and the rotation speed of the flattening roller 16, and the drag amount and the expansion amount are set. Sums were calculated and compared. Specifically, the conditions of (flattening speed, rotational speed) are (70 mm / s, 1 rps), (70 mm / s, 5 rps), (70 mm / s, 8 rps), (50 mm / s, 5 rps), ( 90 mm / s, 5 rps), five three-dimensional objects 105 were formed. Table 3 below shows the sum of the drag amount and the expansion amount of each three-dimensional modeled object 105 that has been modeled.

  As shown in Table 3, focusing on the case where the rotational speed is 5 rps, the sum of the drag amount and the expansion amount is 1.7 mm when the flattening speed is 50 mm / s, and when the flattening speed is 70 mm / s. When the flattening speed was 6.7 mm and the flattening speed was 90 mm / s, it was 24.3 mm. That is, it was confirmed that the drag amount and the expansion amount decrease as the flattening speed is decreased. Further, focusing on the case where the flattening speed is 70 mm / s, the sum of the drag amount and the expansion amount is 30 mm or more when the rotation speed is 1 rps, 6.7 mm when the rotation speed is 5 rps, and 4.5 mm when the rotation speed is 8 rps. became. That is, it was confirmed that the drag amount and the expansion amount decreased as the rotation speed of the flattening roller 16 was increased.

  As described above, according to the PC 100 according to the present embodiment, the three-dimensional modeling apparatus 1 is at least one of dragging and expansion that occurs when the three-dimensional modeling powder is flattened (hereinafter simply referred to as “dragging / expansion”). 3D modeling object 105 can be modeled according to the three-dimensional modeling data that is previously considered. Therefore, the three-dimensional modeling apparatus 1 can suppress the influence of dragging and expansion, and can model the three-dimensional model 105 having an accurate shape.

  The PC 100 sets a position shifted from the modeling position of the modeling layer based on the three-dimensional data in the direction opposite to the planarization direction as a discharge position for discharging the modeling liquid. In this case, the modeling layer that has been modeled is dragged by the flattening roller 16, so that the position of the modeling layer moves to an accurate position. Accordingly, the three-dimensional modeling apparatus 1 can model the three-dimensional model 105 having an accurate shape even when dragging occurs due to flattening.

  PC100 sets the discharge range which discharges modeling liquid in the range which compressed the modeling range of the modeling layer based on three-dimensional data in the direction opposite to a planarization direction. In this case, when the modeling layer that has been modeled is stretched by the flattening roller 16, the position and shape of the modeling layer (that is, the range in which the modeling layer is modeled) become an accurate position and shape. Therefore, the three-dimensional modeling apparatus 1 can model the three-dimensional model 105 having an accurate shape even when the modeling layer expands due to planarization.

  PC100 sets the arrangement | positioning angle on the stage 11 of the three-dimensional molded item 105 so that the range in which a modeling layer is modeled approaches symmetry with respect to the axis | shaft O (refer FIG. 13) extended in a planarization direction. Dragging and expansion occurs in the flattening direction. Therefore, the influence of dragging and expansion appears symmetrically by bringing the shape in plan view of the range in which the modeling layer is formed closer to symmetry with respect to the axis O extending in the flattening direction. Therefore, even when dragging / expansion larger than the predicted level occurs, it is possible to suppress the appearance of the three-dimensional structure 105 from being deteriorated.

  The PC 100 sets the stage 11 of the three-dimensional model 105 to be modeled so that the projection area 106 (see FIG. 12) when the range in which the modeling layer is modeled is projected onto the virtual plane 102 perpendicular to the planarization direction is minimized. Set up the angle of placement. In this case, the drag amount and the expansion amount of the modeling layer are minimized (see evaluation test 1). Therefore, the three-dimensional modeling apparatus 1 can model the three-dimensional model 105 more accurately.

  The PC 100 creates flattening data for controlling the flattening operation by the three-dimensional modeling apparatus 1 based on information for predicting dragging / expansion. Therefore, the three-dimensional modeling apparatus 1 can perform flattening under optimum conditions corresponding to the predicted dragging and expansion of the modeling layer.

  Specifically, the PC 100 determines the relative moving speed of the flattening roller 16 while passing over the modeling layer where modeling is completed from the moving speed while passing over a layer in a range other than the modeling layer where modeling is completed. Also set to a slower speed. As a result, dragging / expansion due to flattening can be suppressed, and the modeling time can be shortened. Further, the PC 100 sets the rotation speed of the flattening roller 16 while passing over the modeling layer for which modeling has been completed to a higher speed than the rotation speed while passing over a layer in a range other than the modeling layer for which modeling has been completed. Set. As a result, dragging / expansion due to flattening is suppressed, and the flattening roller 16 is prevented from being rotated unnecessarily at high speed (see Evaluation Test 3).

  The PC 100 creates thickness data for controlling the stage lifting motor 42 in accordance with the stacking order N of the layers (powder layer and modeling layer). The drag amount and the expansion amount of the modeling layer vary depending on the stacking order N of the powder layers on which the modeling layer is modeled. By controlling the thickness of the powder layer according to the stacking order N, the PC 100 can cause the three-dimensional modeling apparatus 1 to perform an appropriate operation according to the stacking order N and suppress the influence of dragging and expansion. .

  Specifically, the PC 100 creates thickness data that maximizes the thickness of the second powder layer from the bottom layer. As the modeling layer is laminated, the total value of the weights of the modeling layer is increased, so that the drag amount and the expansion amount are reduced. Therefore, the modeling layer modeled in the lowermost layer becomes the modeling layer that is most susceptible to dragging and expansion. Furthermore, as the thickness of the powder layer is increased, the drag amount and the expansion amount of the modeling layer existing in the powder layer immediately below are reduced (see Evaluation Test 2). Therefore, by increasing the thickness of the second powder layer from the bottom layer, it is possible to efficiently reduce the influence of the bottom layer that is most susceptible to dragging and expansion. Moreover, PC100 makes only the thickness of the powder layer in which the stacking order N from the lowest layer is equal to or less than the threshold value larger than the reference value. As the thickness of the powder layer is thicker, the drag amount and the expansion amount of the modeling layer existing in the powder layer immediately below decrease. On the other hand, a fine three-dimensional model 105 can be modeled as the powder layer is thinner. As the modeling layer is laminated, the drag amount and the expansion amount are reduced. The PC 100 increases the thickness of only the powder layer whose stacking order N is equal to or less than the threshold, thereby reducing the influence of drag and expansion while preventing the modeling accuracy from being lowered in the powder layer having a large stacking order N. be able to. In addition, the time for creating the three-dimensional modeling data can be shortened as compared with the case where the thicknesses of all the powder layers are adjusted.

  In the above embodiment, the PC 100 corresponds to the “three-dimensional modeling data creation device” of the present invention. The flattening roller 16 corresponds to the “flattening means” of the present invention. The head 20 corresponds to “ejection means”. The stage elevating motor 42 corresponds to “elevating means”. The CPU 80 that acquires information (prediction information) used for prediction of drag / expansion in S22, S23, S28, S35 in FIG. 11, S51 in FIG. 16, and S65 in FIG. 18 is the “prediction information acquisition unit” of the present invention. Function. The CPU 80 that creates the three-dimensional modeling data in S31 to S33 in FIG. 11 functions as a “three-dimensional modeling data creation unit”.

  The CPU 80 that creates the ejection data by shifting the modeling position in S53 and S55 in FIG. 16 functions as the “first ejection data creation means”. The CPU 80 that generates the discharge data by compressing the modeling range in S54 and S55 in FIG. 16 functions as the “second discharge data creating unit”. The CPU 80 that sets an arrangement angle that approaches symmetry with respect to the axis O in S27 of FIG. 11 functions as “first angle setting means”. The CPU 80 that sets the arrangement angle that minimizes the projection area 106 in S24 of FIG. 11 functions as a “second angle setting unit”. The CPU 80 that executes the flattened data creating process shown in FIG. 18 functions as “flattened data creating means”. The CPU 80 that executes the thickness data creation process shown in FIG. 14 functions as “thickness data creation means”. The value of the stacking order N corresponds to “stacking order information”.

  In S22, S23, S28, S35 of FIG. 11, S51 of FIG. 16, and S65 of FIG. 18, the process of acquiring information (prediction information) used for prediction of drag / expansion is the “prediction information acquisition step” of the present invention. Equivalent to. The process of creating the 3D modeling data in S31 to S33 in FIG. 11 corresponds to the “3D modeling data creation step”.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, when creating the flattening data, the PC 100 according to the above embodiment sets the relative moving speed (flattening speed) of the flattening roller 16 depending on whether or not it passes over the already formed modeling layer. Set to either high speed or low speed. However, the flattening speed setting method can be changed. For example, the flattening speed may be set so that the flattening speed on the modeling layer increases as the value of the stacking order N increases. Even in this case, as in the above embodiment, the modeling time can be shortened while reducing the influence of drag and expansion. In this case, the prediction information referred to by the CPU 80 includes information on the stacking order N. Similarly, the rotational speed of the flattening roller 16 may be set so that the rotational speed decreases as the stacking order N increases.

  The PC 100 of the above-described embodiment has the effect of dragging / expansion by three processes: a thickness data creation process (see FIG. 14), a discharge data creation process (see FIG. 16), and a flattening data creation process (see FIG. 18). Reduce. However, the PC 100 can reduce the influence of dragging / expansion by executing only one or two of the above three processes. In the ejection data creation process shown in FIG. 16, the PC 100 may perform only one of the process for shifting the modeling position (S53) and the process for compressing the modeling range (S54). That is, even if the influence of only one of drag and expansion is reduced, the modeling accuracy of the three-dimensional model 105 can be improved. Further, in the flattening data creation process shown in FIG. 18, only one of the process of setting the moving speed of the flattening roller 16 (S66, S67) and the process of setting the rotational speed (S68, S69) is performed. Also good.

  When setting the arrangement angle of the three-dimensional structure 105, the PC 100 of the above embodiment sets the arrangement angle based on the projection area 106 with respect to the virtual plane 102 as shown in FIG. 11 (S24). Only when a plurality of arrangement angles are set by the process of S24 (S26: YES), one of the arrangement angles set in S24 is adopted based on the symmetry with respect to the axis O (S27). However, the PC 100 first sets the arrangement angle based on the symmetry with respect to the axis O (S27), and adopts one of the arrangement angles based on the projection area 106 when a plurality of arrangement angles are set. (S24). It goes without saying that either one of the setting of the arrangement angle based on the projection area 106 (S24) and the setting of the arrangement angle based on the symmetry with respect to the axis O (S27) may be executed.

  The PC 100 of the above embodiment predicts that the influence of dragging / expansion is negligible for a layer whose stacking order N is greater than the threshold value, and does not execute processing for correcting the modeling position, the modeling range, and the like. Therefore, it is possible to prevent unnecessary processing and efficiently create the three-dimensional modeling data. However, regardless of the stacking order N, the PC 100 may correct the modeling positions and modeling ranges of all layers.

  The PC 100 of the above embodiment refers to the thickness data and the discharge by referring to the thickness setting table (see FIG. 15) and the movement / compression amount setting table (see FIG. 17) created based on the results of experiments performed in advance. Create data. However, the PC 100 can realize the present invention even when parameters for setting the thickness, the moving amount, and the compression amount are not stored in advance. For example, the PC 100 captures the modeled three-dimensional model 105 with a camera and performs image processing on the captured image to calculate the drag amount and the expansion amount. Parameters for setting the thickness, the movement amount, and the compression amount may be appropriately created based on the calculated drag amount / expansion amount and used in the three-dimensional modeling data creation process (see FIG. 11). In this case, the PC 100 can create appropriate three-dimensional modeling data according to the operating conditions of the three-dimensional modeling apparatus 1.

  In the above-described embodiment, the PC 100 creates 3D modeling data based on the 3D data, and outputs the created 3D modeling data to the 3D modeling apparatus 1. However, the three-dimensional modeling apparatus 1 may execute the three-dimensional modeling data creation process shown in FIG. 11 itself. In this case, the three-dimensional modeling apparatus 1 corresponds to the “three-dimensional modeling data creation apparatus” of the present invention. Moreover, it cannot be overemphasized that the solid modeling data preparation process shown in FIG. 11 may be performed with the server etc. which a manufacturer holds. In this case, the server corresponds to the “three-dimensional modeling data creation device” of the present invention.

  In the three-dimensional modeling apparatus 1 of the above embodiment, the relative movement direction of the flattening roller 16 with respect to the stage surface of the stage 11 is parallel to the stage surface. However, the present invention can be realized even when the thickness of the powder layer is changed without making the flattening roller 16 parallel to the stage surface. That is, “parallel” includes substantially parallel.

  The three-dimensional modeling apparatus 1 according to the embodiment flattens the three-dimensional modeling powder while rotating the flattening roller 16. However, the present invention can also be applied to the case where flattening is performed using a squeegee bar, a flat plate or the like instead of the flattening roller 16. Further, the three-dimensional modeling apparatus 1 may perform the planarization by moving the planarization roller 16 horizontally while fixing the position of the modeling table 6. That is, the flattening means may be moved relative to the stage 11. The discharging operation by the head 20 is the same, and the three-dimensional modeling apparatus 1 may move the head 20 relative to the stage 11. In addition, the three-dimensional modeling apparatus 1 may adjust the thickness of the powder layer by raising and lowering the flattening roller 16 instead of raising and lowering the stage 11.

DESCRIPTION OF SYMBOLS 1 Three-dimensional modeling apparatus 11 Stage 16 Flattening roller 20 Head 30 CPU
41 Modeling table longitudinal movement motor 42 Stage elevating motor 43 Roller rotation motor 45 Head movement motor 80 CPU
83 HDD
100 PC
102 Virtual plane 105 Solid object 106 Projected area

Claims (12)

A stage on which a three-dimensional modeling powder solidified by mixing with a modeling liquid is placed;
A leveling means for leveling the surface of the three-dimensional modeling powder placed on the stage to form a powder layer by moving relative to the stage in a direction parallel to the stage surface of the stage;
Discharging means for modeling a modeling layer that is a layer of a three-dimensional modeled object by discharging the modeling liquid to the powder layer formed by the flattening means;
The three-dimensional modeling object for modeling three-dimensional modeling data for controlling a three-dimensional modeling apparatus comprising: lifting and lowering means for changing a distance in a direction perpendicular to the stage surface between the stage surface and the flattening means It is a three-dimensional modeling data creation device that creates from three-dimensional data showing
The modeling layer that has been modeled is dragged and stretched in the process of being dragged and shifted in the process of forming the powder layer on the top surface of the modeling layer by the flattening means. Prediction information acquisition means for acquiring prediction information used for prediction of at least one of expansion that is a phenomenon of expansion;
3D modeling data creation device comprising: 3D modeling data creation means for creating the 3D modeling data based on the prediction information acquired by the prediction information acquisition means. The prediction information acquisition unit acquires at least information on a moving direction of the flattening unit relative to the stage, and information on a position of the modeling layer based on the three-dimensional data,
The three-dimensional modeling data creating means
By setting the position shifted from the position of the modeling layer based on the three-dimensional data in the direction opposite to the moving direction of the flattening means to a discharge position for discharging the modeling liquid to the discharge means, the discharge means The three-dimensional modeling data creation device according to claim 1, further comprising first ejection data creation means for creating ejection data to be controlled. The prediction information acquisition unit acquires at least information on a moving direction of the flattening unit with respect to the stage, and information on a range in which the modeling layer is formed,
The three-dimensional modeling data creating means
The discharge unit is controlled by setting a discharge range in which the discharge unit discharges the modeling liquid in a range in which the range in which the modeling layer is formed is compressed in a direction opposite to the moving direction of the flattening unit. The three-dimensional modeling data creation device according to claim 1, further comprising second ejection data creation means for creating ejection data. The prediction information acquisition unit acquires at least information on a moving direction of the flattening unit with respect to the stage, and information on a range in which the modeling layer is formed,
The three-dimensional modeling data creating means
First angle setting for setting an arrangement angle on the stage of the three-dimensional model to be modeled so that a range in which the modeling layer is modeled approaches a symmetry with respect to an axis extending in the moving direction of the flattening means The three-dimensional modeling data creation device according to claim 1, further comprising means. The prediction information acquisition unit acquires at least information on a moving direction of the flattening unit with respect to the stage, and information on a range in which the modeling layer is formed,
The three-dimensional modeling data creating means
The arrangement angle of the three-dimensional model to be modeled on the stage is set so that the projection area when the range in which the modeling layer is modeled is projected onto a plane perpendicular to the moving direction of the flattening means is minimized. The three-dimensional modeling data creation device according to any one of claims 1 to 4, further comprising a second angle setting means for setting. The three-dimensional modeling data creating means
6. The method according to claim 1, further comprising flattened data creating means for creating flattened data for controlling the flattening means according to the prediction information acquired by the predictive information acquiring means. The three-dimensional modeling data preparation apparatus described in 1. The prediction information acquisition means acquires at least information of a range in which the modeling layer is modeled,
The flattened data creating means includes
7. The moving speed of the flattening means while passing over the modeling layer where modeling has been completed is set to a speed slower than the moving speed while not passing over the modeling layer. 3D modeling data creation device. The prediction information acquisition means acquires at least information of a range in which the modeling layer is modeled,
The flattening means is a rotatable roller;
The flattened data creating means includes
The rotation speed of the roller while passing over the modeling layer where modeling is completed is set to a speed faster than the rotation speed while not passing over the modeling layer. 3D modeling data creation device. The elevating means adjusts the thickness of the powder layer formed by the flattening means by adjusting the distance between the stage surface and the flattening means in the direction perpendicular to the stage surface. ,
The prediction information acquisition means acquires at least stacking order information that is information indicating a stacking order from the lowest layer among the plurality of powder layers to be stacked,
The three-dimensional modeling data creating means
9. The apparatus according to claim 1, further comprising thickness data creating means for creating thickness data for controlling the elevating means according to the stacking order information acquired by the prediction information acquiring means. 3D modeling data creation device.   10. The three-dimensional modeling according to claim 9, wherein the thickness data creating unit creates the thickness data that maximizes the thickness of the second powder layer from the lowest layer among the plurality of powder layers. Data creation device.   The thickness data creation means makes only the thickness of the powder layer whose stacking order from the lowest layer indicated by the stacking order information is equal to or less than a threshold value to be thicker than a reference value. 3D modeling data creation device. A stage on which a three-dimensional modeling powder solidified by mixing with a modeling liquid is placed;
A leveling means for leveling the surface of the three-dimensional modeling powder placed on the stage to form a powder layer by moving relative to the stage in a direction parallel to the stage surface of the stage;
Discharging means for modeling a modeling layer that is a layer of a three-dimensional modeled object by discharging the modeling liquid to the powder layer formed by the flattening means;
The three-dimensional modeling object for modeling three-dimensional modeling data for controlling a three-dimensional modeling apparatus comprising: lifting and lowering means for changing a distance in a direction perpendicular to the stage surface between the stage surface and the flattening means 3D modeling data creation program for creating from 3D data indicating
The modeling layer that has been modeled is dragged and stretched in the process of being dragged and shifted in the process of forming the powder layer on the top surface of the modeling layer by the flattening means. A prediction information acquisition step of acquiring prediction information used for prediction of at least one of expansion that is a phenomenon of expansion;
A three-dimensional modeling data creation program including an instruction for causing a controller of a three-dimensional modeling data creation device to execute a three-dimensional modeling data creation step of creating the three-dimensional modeling data based on the prediction information acquired in the prediction information acquisition step.

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