CN108859110B - How to place the 3D part model - Google Patents

Abstract

The invention provides a method for placing a three-dimensional part model. The placing method of the three-dimensional part model comprises the following steps: step 1: introducing a three-dimensional part model, and placing the three-dimensional part model in a fixed rectangular coordinate system XYZ; step 2: identifying the characteristics of the three-dimensional part model, comparing a preset condition with the identified characteristics, and placing the three-dimensional part model according to a comparison result; and step 3: and respectively rotating the three-dimensional part model around an X axis and a Y axis, adjusting the coordinates of the three-dimensional part model, and enabling the vertical distance between the highest point and the lowest point of the adjusted three-dimensional part model in the rectangular coordinate system along the Z axis to be the minimum, thereby enabling the printing height of the three-dimensional part model to be the minimum. The placing method of the three-dimensional part model can minimize the printing height of the three-dimensional part model, shorten the subsequent printing time and improve the production efficiency.

Description

How to place the 3D part model

technical field

The invention relates to the field of three-dimensional printing, in particular to a method for placing a three-dimensional part model.

Background technique

3D printing technology is a kind of rapid prototyping technology. It uses the principle of discrete-stacking, based on digital model files, uses powder to be formed made of metal or non-metal materials, and melts the flat powder to be formed layer by layer. Melt, then solidify and accumulate to form three-dimensional objects. With the rapid development of 3D printing technology, 3D printers have been widely used in product manufacturing. However, 3D printing is layered printing. When the part model is imported into the processing platform, it is usually set obliquely. For example, there is a certain angle between the part model and the horizontal plane, which makes the longitudinal length of the printing longer, thus increasing the printing time, which is not conducive to the cost. control and reduce processing efficiency.

SUMMARY OF THE INVENTION

In view of the above situation, the present invention provides a method for placing a three-dimensional part model, which can adjust the position of the three-dimensional part model, so that the bottom surface of the part is roughly parallel to the horizontal plane, the printing height of the part is minimized, the number of printing layers is reduced, and the printing time is shortened , thereby improving printing efficiency.

A method for placing a three-dimensional part model, comprising the following steps:

Step 1: Import the 3D part model and place the 3D part model in a fixed Cartesian coordinate system XYZ;

Step 2: Identify the features of the three-dimensional part model, compare the preset conditions with the identified features, and place the three-dimensional part model according to the comparison result;

Step 3: Rotate the 3D part model around the X axis and the Y axis respectively, and adjust the coordinates of the 3D part model so that the vertical distance between the highest point and the lowest point of the adjusted 3D part model in the Cartesian coordinate system along the Z axis is the smallest, so that the 3D part models have the lowest print height.

Preferably, the number of the three-dimensional part models is at least one.

Further, after performing step 1 to import the three-dimensional part model, it further includes the step of: judging whether the three-dimensional part model needs to be flipped, and flipping or not flipping the three-dimensional part model according to the judgment result.

Preferably, the preset conditions are the number of part models, the type of part models, and the processing steps of the part models, and step 2 includes:

The number and structure of parts in each of the three-dimensional part models are identified, and the three-dimensional part models are arranged at intervals in sequence according to the number of parts, the structural category of the parts, or the processing steps of the parts.

Preferably, the step 2 includes: projecting the three-dimensional part model in the Cartesian coordinate system XYZ to the XY plane; rotating the three-dimensional part model around the Z axis, so that the long side of the projection of the three-dimensional part model on the XY plane is substantially parallel to the Y axis or the X axis.

Preferably, in step 1, the three-dimensional part model is a solid model file that can be used in a three-dimensional printing system, and the file format includes .stl, .stp, or .igs.

Further, judging whether the three-dimensional part model needs to be flipped, and flipping or not flipping the three-dimensional part model according to the judgment result also includes:

If the open end of the three-dimensional part model faces upwards, it is determined that the three-dimensional part model does not need to be turned over, and the three-dimensional part model remains stationary;

If the open end of the three-dimensional part model faces downwards, it is determined that the three-dimensional part model needs to be turned by 180°, and the three-dimensional part model is rotated by 180°.

Further, the Cartesian coordinate system XYZ is a Cartesian Cartesian coordinate system, and step 3 also includes:

Project the 3D part model in the Cartesian coordinate system XYZ to the YZ plane;

Determine the lowest and highest points projected on the YZ plane, and record the Z-axis coordinates of the lowest and highest points;

Take the lowest point as the rotation center of the 3D part model, and rotate it clockwise or counterclockwise around the X-axis. Each point on the bottom edge of the projection on the YZ plane is not lower than the lowest point, and the Z-axis coordinate of the highest point takes the minimum value. , the 3D part model stops rotating.

Further, step 3 also includes:

Project the rotated 3D part model to the XZ plane;

Determine the lowest and highest points projected on the XZ plane, and record the Z-axis coordinates of the lowest and highest points;

Take the lowest point as the rotation center of the 3D part model, rotate it clockwise or counterclockwise around the Y axis, and each point on the bottom edge of the projection on the XZ plane is not lower than the lowest point, and the Z axis coordinate of the highest point takes the minimum value. , the 3D part model stops rotating.

Further, after performing the step 3, the method further includes the step of: starting the three-dimensional printer, and starting to print the three-dimensional part model.

The three-dimensional part model arrangement method of the present invention arranges the three-dimensional part models to be printed at intervals, so that the parts do not interfere with each other. After the printing is completed, the parts on one side can be removed, and the parts on the other side can continue to be processed later. Such as heat treatment, etc., thereby improving the production efficiency of products. The steps of projecting the 3D part model to the YZ and XZ planes and then rotating around the X-axis and Y-axis respectively can easily and quickly adjust the horizontal position of the 3D part model, so that the highest point and the lowest point of the 3D part model are in the Cartesian coordinate system. The vertical distance along the Z axis is the smallest, and the printing height is the lowest, which shortens the subsequent printing time and improves production efficiency.

Description of drawings

FIG. 1 is a flow chart of a method for placing a three-dimensional part model according to the present invention.

FIG. 2 is a schematic diagram of the method of rotating the part after projecting the three-dimensional part model on the XY plane according to the present invention.

3 is a schematic diagram of a method for rotating the part after projecting the three-dimensional part model of the present invention onto the YZ plane.

FIG. 4 is a schematic diagram of the method for rotating the part after projecting the three-dimensional part model on the XZ plane according to the present invention.

Detailed ways:

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to Fig. 1, Fig. 1 is the arrangement method of the three-dimensional part model of the present invention, and the specific implementation steps are as follows:

Step S101: Import a three-dimensional part model.

The three-dimensional part model is imported into the three-dimensional printing system and placed in a fixed rectangular coordinate system XYZ. The imported 3D part model is a solid model file that can have a 3D printing system, and the file format can be but not limited to ".stl", ".stp", ".igs" and other file formats. When importing a 3D part model, only one 3D part model can be imported, or multiple 3D part models can be imported at the same time. This embodiment does not limit the number of imported 3D part models.

Step S102: Determine whether the three-dimensional part model needs to be flipped, and flip or not flip the three-dimensional part model according to the judgment result.

When the 3D part model is a structure with an opening at one end and a closed end at the other end, such as a dental crown model, it is beneficial for the implementation of the subsequent printing process in the 3D printing system that the open end is facing upwards. Determining whether the 3D part model needs to be turned over includes judging whether the open end of the 3D part model faces upwards. If the open end of the three-dimensional part model faces upwards, it is determined that the three-dimensional part model does not need to be turned over, the three-dimensional part model is guaranteed not to move, and the process directly proceeds to step S103. If the open end of the three-dimensional part model faces downwards, it is determined that the three-dimensional part model needs to be flipped, and the three-dimensional part model is flipped 180° around the center of the part so that the open end of the three-dimensional part model faces up, and then proceeds to step S103.

In other embodiments, step S102 may also be omitted, and it is not necessary to determine whether to flip the three-dimensional part model, and step S103 is directly entered.

Step S103: Identify the quantity and structure of the three-dimensional part models, and arrange the three-dimensional part models in sequence according to preset conditions. The preset conditions can be the number of part models, the type of part models, and the processing steps of the part models.

The three-dimensional part model may be a crown model. Taking the crown model as an example, since the structure and quantity of each crown part are different, by identifying the number and structure category of each crown model, the crown models can be arranged in intervals from left to right according to the number of teeth. , or according to the tooth type from left to right sub-area spaced. It is also possible to arrange the parts in sequence according to the number of processing steps according to the subsequent processing steps of the parts. When importing multiple 3D part models, first adjust the positions of the multiple 3D part models so that the Z coordinates of the lowest points of the multiple 3D part models are consistent, that is, the lowest points of the multiple 3D part models are at the same height. Then, the three-dimensional part model is projected to the XY plane. Please refer to Figure 2 for a schematic diagram of the projection. At this time, there is a certain angle between the long side of the projection on the XY plane and the Y axis. The 3D printing system judges the long side and the short side of the projection according to the boundary vertex coordinates of the projection on the XY plane. Then, according to the X-axis coordinate value of each point on the projection boundary on the XY plane, record the nearest point A0 and the farthest point A1 from the Y-axis, and record the X-axis coordinate X0 of the nearest point A0 and the X-axis coordinate of the farthest point A1 X1. Then take the nearest point A0 as the rotation center, and rotate the three-dimensional part model around the Z axis. When the X-axis coordinate value of each point on the long side of the projection on the XY plane is not less than the nearest point A0, and the X-coordinate value X1 of the farthest point A1 takes the minimum value, the three-dimensional part model stops rotating. At this time, the long side of the projection of the three-dimensional part model on the XY plane is parallel to the Y axis, as shown in Figure 2. This adjustment is conducive to arranging as many three-dimensional part models as possible in the X-axis direction, saving printing space.

In other embodiments, the 3D part model can be rotated around the Z axis so that the long side of the projection on the XY plane is parallel to the X axis, and the 3D part models are arranged in a top-to-bottom or bottom-to-top order. The adjustment rules and methods are similar to the above, and are not repeated here.

The arranged 3D part models do not interfere with each other. After the parts are printed, the parts that need to be further processed on one side can be taken out as needed, and the parts on the other side can be subjected to further other procedures, such as heat treatment, etc., which is conducive to improving the quality of the parts. production efficiency.

Step S104: Rotate the three-dimensional part model around the X-axis and the Y-axis respectively, adjust the coordinates of the three-dimensional part model, so that the vertical distance between the highest point and the lowest point of the adjusted three-dimensional part model in the rectangular coordinate system along the Z-axis is minimized, so that the 3D part models have the lowest print height.

Specifically, the fixed Cartesian coordinate system XYZ is the Cartesian Cartesian coordinate system XYZ, and the three-dimensional part model located in the Cartesian coordinate system XYZ is first projected to the YZ plane, the schematic diagram of the projection can be seen in Figure 3, and the projection on the YZ plane is inclined at this time. , in other words, there is an angle between the base of the projection on the YZ plane and the Y axis. The lowest point and the highest point of the projection on the YZ plane are determined according to the Z-axis coordinates of each point on the boundary of the projection on the YZ plane. The lowest point of the projection on the YZ plane is recorded as P0, the highest point is recorded as P1, and the Z-axis coordinate Z0 of the lowest point P0 and the Z-axis coordinate Z1 of the highest point P1 are recorded. Taking the lowest point P0 as the center of rotation, rotate the 3D part model clockwise or counterclockwise around the X axis, when each point on the bottom edge of the projection on the YZ plane is not lower than the lowest point P0, and the Z coordinate value of the highest point P1 When Z1 takes the minimum value, the 3D part model stops rotating. At this time, the bottom edge of the projection of the three-dimensional part model on the YZ plane is parallel to the Y axis, as shown in Figure 3.

Further, the rotated three-dimensional part model is projected to the XZ plane, and the schematic diagram of the projection can be seen in Figure 4. At this time, the projection on the XZ plane is inclined, in other words, between the bottom edge of the projection on the XZ plane and the X axis. There is a certain angle. The lowest point and the highest point of the projection on the XZ plane are determined according to the Z-axis coordinates of each point on the boundary of the projection on the XZ plane. The lowest point of the projection on the XZ plane is recorded as P0', the highest point is recorded as P1', and the Z-axis coordinate Z0' of the lowest point P0' and the Z-axis coordinate Z1' of the highest point P1' are recorded. Taking the lowest point P0' as the rotation center, rotate the 3D part model clockwise or counterclockwise around the X-axis, when each point on the bottom edge of the projection on the XZ plane is not lower than the lowest point P0', and the highest point P1' When the Z coordinate value Z1' takes the minimum value, the three-dimensional part model stops rotating. At this time, the bottom edge of the projection of the three-dimensional part model on the XZ plane is parallel to the X axis, as shown in Figure 4.

So far, there are two lines on the plane where the bottom surface of the 3D part model is parallel to the XY plane, so the bottom surface of the 3D part model is roughly parallel to the XY plane. The highest point and the lowest point of the adjusted 3D part model are in the rectangular coordinate system along Z. The vertical distance of the axis is the smallest, so that the printing height of the 3D part model is the lowest, and the placement of the 3D part model is completed. At this time, the 3D printer can be started to start the printing of the 3D part model.

The arranging method of the three-dimensional part model of the present invention can be realized by the C++ programming language. The C++ programming language code for realizing the method for placing the three-dimensional part model of the present invention can be stored in the control terminal of the three-dimensional printing system. When the three-dimensional part model is imported into the control terminal, the method for placing the three-dimensional part model of the present invention can be automatically executed to complete the placement of the three-dimensional part model and prepare for subsequent three-dimensional printing.

The three-dimensional part model arrangement method of the present invention arranges the three-dimensional part models to be printed at intervals, so that the parts do not interfere with each other. After the printing is completed, the parts on one side can be removed, and the parts on the other side can continue to be processed later. Such as heat treatment, etc., thereby improving the production efficiency of products. The steps of projecting the 3D part model to the YZ and XZ planes and then rotating around the X-axis and Y-axis respectively can easily and quickly adjust the horizontal position of the 3D part model, so that the highest point and the lowest point of the 3D part model are in the Cartesian coordinate system. The vertical distance along the Z axis is the smallest, and the printing height is the lowest, which shortens the subsequent printing time and improves production efficiency.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. Neither should depart from the spirit and scope of the technical solutions of the present invention.

Claims (8)

1. a method for placing a three-dimensional part model, is characterized in that, comprises the steps: Step 1: Import the 3D part model and place the 3D part model in a fixed Cartesian coordinate system XYZ; Step 2: Identify the features of the three-dimensional part model, compare the preset conditions with the identified features, and place the three-dimensional part model according to the comparison result; Step 3: Rotate the 3D part model around the X axis and the Y axis respectively, and adjust the coordinates of the 3D part model so that the vertical distance between the highest point and the lowest point of the adjusted 3D part model in the Cartesian coordinate system along the Z axis is the smallest, so that the The printing height of the three-dimensional part model is the lowest; the rectangular coordinate system XYZ is a Cartesian rectangular coordinate system, and step 3 also includes: Project the 3D part model in the Cartesian coordinate system XYZ to the YZ plane; Determine the lowest and highest points projected on the YZ plane, and record the Z-axis coordinates of the lowest and highest points; Take the lowest point as the rotation center of the 3D part model, and rotate it clockwise or counterclockwise around the X-axis. Each point on the bottom edge of the projection on the YZ plane is not lower than the lowest point, and the Z-axis coordinate of the highest point takes the minimum value. , the 3D part model stops rotating; Project the rotated 3D part model to the XZ plane; Determine the lowest and highest points projected on the XZ plane, and record the Z-axis coordinates of the lowest and highest points; Take the lowest point as the rotation center of the 3D part model, rotate it clockwise or counterclockwise around the Y axis, and each point on the bottom edge of the projection on the XZ plane is not lower than the lowest point, and the Z axis coordinate of the highest point takes the minimum value. , the 3D part model stops rotating. 2 . The method for arranging three-dimensional part models according to claim 1 , wherein the number of the three-dimensional part models is at least one. 3 . 3. The method for placing the three-dimensional part model as claimed in claim 1, characterized in that, after performing step 1 to import the three-dimensional part model, the method further comprises the steps: It is judged whether the three-dimensional part model needs to be flipped, and the three-dimensional part model is flipped or not flipped according to the judgment result. 4. The method for placing three-dimensional part models as claimed in claim 2, wherein the preset condition is the number of parts models, the types of parts models, and a part model processing procedure, and step 2 comprises: The number and structure of parts in each of the three-dimensional part models are identified, and the three-dimensional part models are arranged at intervals in sequence according to the number of parts, the structural category of the parts, or the processing steps of the parts. 5. The method for placing a three-dimensional part model as claimed in claim 4, wherein the step 2 comprises: Project the 3D part model in the Cartesian coordinate system XYZ to the XY plane; When importing multiple 3D part models, the multiple 3D part models are arranged at intervals, and the positions of the multiple 3D part models are adjusted so that the Z coordinates of the lowest point of the multiple 3D part models are consistent; Rotate the 3D part model around the Z axis so that one side of the projection of the 3D part model on the XY plane is parallel to the Y axis or the X axis. 6. The method for placing a three-dimensional part model according to claim 1, wherein in step 1, the three-dimensional part model is a solid model file that can be used in a three-dimensional printing system, and the file format includes .stl, .stp, or .igs. 7. The method for placing a three-dimensional part model as claimed in claim 3, wherein judging whether the three-dimensional part model needs to be flipped, and flipping or not flipping the three-dimensional part model according to the judgment result further comprises: If the open end of the three-dimensional part model faces upwards, it is determined that the three-dimensional part model does not need to be turned over, and the three-dimensional part model remains stationary; If the open end of the three-dimensional part model faces downwards, it is determined that the three-dimensional part model needs to be turned by 180°, and the three-dimensional part model is rotated by 180°. 8. The method for placing a three-dimensional part model according to claim 1, wherein after performing the step 3, the method further comprises the steps of: Start the 3D printer and start printing the 3D part model.

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