CN-116619742-B - Method for manufacturing three-dimensional modeling object and three-dimensional modeling system

CN116619742BCN 116619742 BCN116619742 BCN 116619742BCN-116619742-B

Abstract

The present disclosure provides a method for manufacturing a three-dimensional modeling object and a three-dimensional modeling system, wherein the moving speed of a discharge part in three-dimensional modeling is appropriately determined. The method for manufacturing a three-dimensional molded article includes a first step of determining a movement speed of an ejection portion in each partial path based on an arrangement of end points indicating a start point and an end point of a plurality of partial paths included in path information indicating a movement path in which the ejection portion moves while ejecting a molding material toward a stage by the plurality of partial paths, and a second step of ejecting and layering the molding material from the ejection portion while moving the ejection portion at the determined movement speed.

Inventors

MASHIMA ATSUSHI
ADACHI KOHEI
Akihara Zhengzhang

Assignees

精工爱普生株式会社

Dates

Publication Date: 20260505
Application Date: 20230216
Priority Date: 20220221

Claims (5)

1. A method for manufacturing a three-dimensional molded article, comprising: A first step of determining a moving speed of the ejection part in each of the partial paths based on an arrangement of end points indicating a start point and an end point of the plurality of partial paths included in path information indicating a moving path in which the ejection part moves while ejecting the modeling material toward the stage by the plurality of partial paths; a second step of ejecting the modeling material from the ejection section and laminating the modeling material while moving the ejection section at the determined moving speed, In the first step of the process, the first step, Determining the moving speed in the partial path to which the discharge unit first reaches, of the partial paths connecting the two continuous end points connected to the circumscribed circle, based on the radii of circumscribed circles circumscribed with the three end points continuous on the moving path, When the radius of the circumscribing circle is smaller than a predetermined reference radius, the magnitude of the moving speed in the partial path is determined as a first speed, and when the radius of the circumscribing circle is equal to or larger than the reference radius, the magnitude of the moving speed in the partial path is determined as a second speed which is faster than the first speed, When two partial paths having different moving speeds among the plurality of partial paths are continuous, one partial path having a faster moving speed among the two continuous partial paths is determined as a speed change section for accelerating or decelerating the moving speed of the ejection section, Generating a deceleration instruction for decelerating the moving speed from the second speed to the first speed with a predetermined fixed acceleration in the one partial path set as the speed change section, and an acceleration instruction for accelerating the moving speed from the first speed to the second speed with a predetermined fixed acceleration in the one partial path.
2. The method for producing a three-dimensional shaped object according to claim 1, wherein, The method comprises a step of determining the ejection amount of the modeling material from the ejection part in each of the partial paths, The second step includes a flow rate control step of controlling a flow rate adjusting mechanism that adjusts an amount of the molding material flowing through the flow path and a pressure adjusting portion that adjusts a pressure in the flow path based on the determined ejection amount.
3. The method for producing a three-dimensional shaped object according to claim 2, wherein, The ejection portion includes a plasticizing portion that generates the molding material and a pressure sensor that detects a pressure in a runner through which the molding material flows, The plasticizing part comprises a screw having a groove forming surface formed with a groove and rotating, and a cylinder having an opposing surface opposing the groove forming surface and having a communication hole formed on the opposing surface, The second step includes a rotation control step of controlling rotation of the screw based on a detection value of the pressure sensor.
4. The method for producing a three-dimensional shaped object according to claim 3, wherein, In the second step, the rotation control step is performed on the partial path in which the fluctuation range of the moving speed is within a predetermined reference range, and the flow control step is performed on the partial path in which the fluctuation range exceeds the reference range.
5. A three-dimensional modeling system is provided with: An objective table; an ejection unit that ejects a modeling material toward the stage; a moving mechanism for changing the relative position of the ejection unit and the stage; The control part is used for controlling the control part to control the control part, The control unit performs the following processing: A first process of determining a moving speed of the ejection portion in each of the partial paths based on an arrangement of end points indicating a start point and an end point of the plurality of partial paths included in path information indicating a path in which the ejection portion moves while ejecting the modeling material by the plurality of partial paths; A second step of ejecting the modeling material from the ejection section and layering the modeling material in layers in accordance with the determined movement speed, In the course of the first process described above, Determining the moving speed of the partial path, which is the first to reach the ejection part, of the partial path connecting the two continuous end points connected to the circumscribed circle based on the radius of the circumscribed circle circumscribed by the three continuous end points on the path, When the radius of the circumscribing circle is smaller than a predetermined reference radius, the magnitude of the moving speed in the partial path is determined as a first speed, and when the radius of the circumscribing circle is equal to or larger than the reference radius, the magnitude of the moving speed in the partial path is determined as a second speed which is faster than the first speed, When two partial paths having different moving speeds among the plurality of partial paths are continuous, one partial path having a faster moving speed among the two continuous partial paths is determined as a speed change section for accelerating or decelerating the moving speed of the ejection section, Generating a deceleration instruction for decelerating the moving speed from the second speed to the first speed with a predetermined fixed acceleration in the one partial path set as the speed change section, and an acceleration instruction for accelerating the moving speed from the first speed to the second speed with a predetermined fixed acceleration in the one partial path.

Description

Method for manufacturing three-dimensional modeling object and three-dimensional modeling system Technical Field The present disclosure relates to a method of manufacturing a three-dimensional modeling object and a three-dimensional modeling system. Background Patent document 1 discloses a technique of molding a three-dimensional object by extruding a thermoplastic material, which is melted, from an extrusion nozzle that scans according to preset shape data, onto a base, and further laminating the melted material on the hardened material on the base. Patent document 1 does not disclose determining the scanning speed of the extrusion nozzle. The scanning speed can affect the modeling time and the modeling accuracy of the three-dimensional modeling. For example, in general, the modeling accuracy can be improved if the scanning speed is slowed down, but the modeling time becomes longer. In addition, in the case of shaping a curved portion of a three-dimensional object, if the scanning speed is too high, there is a case where the extrusion nozzle is not completely curved at the curved portion to deviate from an assumed trajectory, so that the shaping accuracy is lowered. Accordingly, a technique for appropriately determining the scanning speed is desired. Patent document 1 Japanese patent laid-open No. 2006-192710 Disclosure of Invention According to a first aspect of the present disclosure, a method of manufacturing a three-dimensional modeling object is provided. The method for manufacturing a three-dimensional modeling object includes a first step of determining a movement speed of a discharge section in a plurality of partial paths based on an arrangement of end points indicating a start point and an end point of the partial paths included in path information indicating a movement path in which the discharge section moves while discharging modeling material toward a stage, and a second step of discharging the modeling material from the discharge section and layering the modeling material while moving the discharge section at the determined movement speed. According to a second aspect of the present disclosure, a three-dimensional modeling system is provided. The three-dimensional modeling system includes a stage, an ejection unit that ejects modeling material toward the stage, a movement mechanism that changes a relative position between the ejection unit and the stage, and a control unit that performs a first process of determining a movement speed of the ejection unit in each of the partial paths based on an arrangement of end points representing a start point and an end point of a plurality of partial paths included in path information indicating a path along which the ejection unit moves while ejecting the modeling material, and a second process of ejecting and layering the modeling material from the ejection unit in accordance with the determined movement speed. Drawings Fig. 1 is an explanatory diagram showing a schematic configuration of a three-dimensional modeling system according to a first embodiment. Fig. 2 is a perspective view showing a schematic structure of the screw. Fig. 3 is a plan view showing a schematic structure of the cylinder. Fig. 4 is an explanatory diagram schematically showing a state in which a three-dimensional modeling object is modeled. Fig. 5 is a flowchart of the three-dimensional modeling process in the first embodiment. Fig. 6 is an explanatory diagram of the first process. Fig. 7 is a diagram for explaining the determination of the movement speed of the ejection portion in the first section. Fig. 8 is a flowchart of the three-dimensional modeling process in the second embodiment. Detailed Description A. First embodiment: Fig. 1 is an explanatory diagram showing a schematic configuration of a three-dimensional modeling system 15 according to a first embodiment. In fig. 1, arrow marks representing mutually orthogonal X, Y, Z directions are shown. The X direction and the Y direction are directions parallel to the horizontal plane, and the Z direction is a direction along the vertical upward direction. The arrow mark indicating the X, Y, Z direction is also appropriately illustrated in other figures in such a way that the illustrated direction corresponds to fig. 1. In the following description, when the direction is specified, the direction indicated by the arrow mark in each drawing is indicated by "+" and the opposite direction is indicated by "-" and the direction mark is given positive and negative symbols. Hereinafter, the +z direction is also referred to as "up", and the-Z direction is referred to as "down". The three-dimensional modeling system 15 includes a three-dimensional modeling apparatus 100 and a control unit 101 that controls the three-dimensional modeling apparatus 100. In the present embodiment, the control unit 101 is provided in the three-dimensional modeling apparatus 100. The three-dimensional modeling apparatus 100 includes a modeling unit 110 that g