WO2023098338A1

WO2023098338A1 - Method, apparatus and device for generating 3d printing file, and storage medium

Info

Publication number: WO2023098338A1
Application number: PCT/CN2022/127038
Authority: WO
Inventors: 敖丹军; 唐京科; 易陈林
Original assignee: 深圳市创想三维科技股份有限公司
Priority date: 2021-11-30
Filing date: 2022-10-24
Publication date: 2023-06-08
Also published as: CN114147971A

Abstract

Disclosed are a method, apparatus and device for generating a 3D printing file, and a storage medium. The method for generating the 3D printing file comprises: obtaining slice hierarchical data of a 3D model in different inclined slice directions; for each inclined slice direction, according to the slice hierarchical data of the current inclined slice direction, determining a support amount of a support required to be added in the 3D model in the current inclined slice direction; determining a target slice direction corresponding to the minimum support amount; and generating a printing file of the 3D model according to the slice hierarchical data corresponding to the target slice direction. By means of such a method, model printing is performed in the slice direction having the minimum support amount, the problems that the number of consumables is increased, the printing time is prolonged, supports are difficult to be peeled off and the surface precision of the model is affected after peeling off due to the fact that the number of support structures is large are solved, and the effects of improving a model printing speed, reducing printing materials and improving the surface printing precision of the model are achieved.

Description

A method, device, equipment and storage medium for generating a 3D printing file

Cross References to Related Applications

This application claims priority to Chinese application No. 202111448612.3 filed on November 30, 2021, which is hereby incorporated by reference in its entirety for all purposes.

technical field

The embodiment of the present invention relates to a 3D model oblique printing technology, and in particular to a method, device, equipment and storage medium for generating a 3D printing file.

Background technique

The principle of 3D printing technology is fusion lamination technology, which obtains geometric model entities of arbitrary shapes by superimposing printing materials layer by layer on the formed surface. The model is printed on the Z-axis of the printer facing upwards. If the upper layer protrudes more than the next layer, the molten consumables of the protruding upper layer will not have time to solidify. Under the influence of gravity, the consumables will fall down. In order to ensure that the model does not deform, Support structures need to be added.

Although the addition of support structures ensures that the model will not be deformed during printing, more support structures also bring problems such as increased consumables, increased printing time, and difficulty in peeling off the supports. Surface accuracy of the model.

Contents of the invention

The invention provides a method, device, equipment and storage medium for generating 3D printing files, so as to achieve the effects of increasing the printing speed of models, reducing printing materials and improving the printing accuracy of model surfaces.

In a first aspect, an embodiment of the present invention provides a method for generating a 3D printing file, including:

Obtain the slice layer data of the 3D model in different oblique slice directions;

For each oblique slice direction, according to the slice layer data of the current oblique slice direction, determine the amount of support that needs to be added to the 3D model in the current oblique slice direction;

Determine the target slice direction corresponding to the minimum support amount;

A print file of the 3D model is generated according to slice layer data corresponding to the target slice direction.

Optionally, the determination of the amount of support required to be added to the 3D model in the current oblique slice direction according to the slice layer data of the current oblique slice direction includes:

According to the slice layer data of the current oblique slice direction, determine the surface to be supported that needs to be added for each slice layer;

For each slice layer, obtain the support area corresponding to the surface to be supported of the current slice layer, and the suspended height of points on the surface to be supported; determine the support amount of the current slice layer according to the support area and the suspended height ;

According to the support amount of each slice layer, the support amount required to be added to the 3D model in the current oblique slice direction is determined.

Optionally, according to the slice layer data of the current oblique slice direction, determining the surface to be supported that needs to be added for each slice layer includes:

Perform Boolean operations on the projection of the nth layer slice and the projection of the (n+1)th layer slice; where n is the number of layers where the slice of the 3D model is located, and n is a positive integer;

If the operation result is that the projection of the (n+1)th layer slice is larger than the projection of the nth layer slice, then according to the projection of the (n+1)th layer slice and the projection of the nth layer slice The connectivity of the surface corresponding to the difference value determines the dangling surface of the (n+1) layer slice;

According to the suspended surface, determine the surface to be supported on which the (n+1)th slice needs to be supported.

Optionally, according to the suspended surface, determining the surface to be supported for which the (n+1)th layer slice needs to be supported includes:

For each floating surface, obtain the length of the current floating surface along the printing line direction;

The area whose length along the printing line direction is greater than the preset threshold is taken as the supporting surface where support needs to be added.

Optionally, the obtaining slice layered data of the 3D model in different oblique slice directions includes:

According to the preset angle, the preset oblique slice direction is rotated around the vertical direction; wherein, the angle between the straight line where the preset oblique slice direction is located and the horizontal plane remains unchanged;

The 3D model is respectively sliced according to the rotated oblique slicing direction, and slice layered data of the 3D model in different oblique slicing directions are obtained.

Rotate the 3D model around the vertical direction according to the preset angle;

The rotated 3D model is respectively sliced according to the preset oblique slicing direction, and slice layered data of the 3D model in different oblique slicing directions are obtained.

Optionally, before determining the amount of support required to be added to the 3D model in the current oblique slice direction according to the slice layer data of the current oblique slice direction for each oblique slice direction, the method further includes:

Change the angle between the line where the preset oblique slice direction is located and the horizontal plane;

Let the preset oblique slice direction be the changed oblique slice direction, and re-enter the acquisition of slice layered data of the 3D model in different oblique slice directions.

In the second aspect, the embodiment of the present invention also provides a device for generating a 3D printing file, including:

The slice layered data acquisition module is used to obtain the slice layered data of the 3D model in different oblique slice directions;

The support amount acquisition module is used to determine the amount of support that needs to be added to the 3D model in the current oblique slice direction according to the slice layer data of the current oblique slice direction for each oblique slice direction;

A target slice direction determining module, configured to determine the target slice direction corresponding to the minimum support amount;

A print file generating module, configured to generate a print file of the 3D model according to the slice layer data corresponding to the target slice direction.

In the third aspect, the embodiment of the present invention also provides a device for generating a 3D printing file, the device for generating a 3D printing file includes:

one or more processors;

memory for storing one or more programs;

When the one or more programs are executed by the one or more processors, the one or more processors implement the method for generating a 3D printing file described in any one of the first aspects.

In the fourth aspect, the embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the method for generating a 3D printing file as described in any one of the first aspects is implemented .

The present invention obtains the slice layer data of the 3D model in different oblique slice directions; for each oblique slice direction, according to the slice layer data of the current oblique slice direction, the amount of support required to be added to the 3D model in the current oblique slice direction is determined; Determine the target slice direction corresponding to the minimum support amount; generate the print file of the 3D model according to the slice layer data corresponding to the target slice direction. Through this method, the model can be printed in the slicing direction with the least amount of support, which solves the problems of increased consumables, increased printing time, difficulty in peeling off the support and the impact on the surface accuracy of the model after peeling off, and improves the model. The effect of printing speed, reducing printing materials and improving the printing accuracy of the model surface.

Description of drawings

FIG. 1A is a schematic flowchart of a method for generating a 3D printing file provided by Embodiment 1 of the present invention;

FIG. 1B is a schematic flow diagram of the rotation of the preset oblique slice direction in a method for generating a 3D printing file provided by Embodiment 1 of the present invention;

FIG. 1C is a schematic diagram of 3D model rotation in a method for generating a 3D printing file provided by Embodiment 1 of the present invention;

1D is a schematic diagram of the angle transformation between the straight line where the preset oblique slice direction is located and the horizontal plane in a method for generating a 3D printing file provided by Embodiment 1 of the present invention;

FIG. 1E is a schematic diagram of the angle transformation between the line where the preset oblique slice direction is located and the horizontal plane in another method for generating a 3D printing file provided by Embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of a 3D printing file generating device provided in Embodiment 2 of the present invention;

FIG. 3 is a schematic structural diagram of a device for generating a 3D printing file provided by Embodiment 3 of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

Embodiment one

Figure 1 is a schematic flow chart of a method for generating a 3D printing file provided by Embodiment 1 of the present invention. This embodiment is applicable to the case of obliquely printing a 3D model, and this method can be implemented by a device for generating a 3D printing file. Execute, specifically include the following steps:

Step 110, obtaining slice layer data of the 3D model in different oblique slice directions.

The slicing direction of the 3D model is different, and the amount of support required when printing the 3D model may be different. Oblique layering of the 3D model can reduce the amount of support. After the 3D model is input into the 3D printer, the system automatically generates the initial oblique slice direction according to the model data or the user manually sets the initial oblique slice direction.

Step 110 includes the following two situations:

The first one, the position of the 3D model is fixed, and the direction of the oblique slice is changed, which specifically includes the following steps:

A1. Rotate the preset oblique slice direction around the vertical direction according to the preset angle; wherein, the angle between the straight line where the preset oblique slice direction is located and the horizontal plane remains unchanged.

A2. Slicing the 3D model according to the rotated oblique slicing direction, and obtaining slice layered data of the 3D model in different oblique slicing directions.

The position of the 3D model is fixed, and the angle between the line where the preset oblique slice direction is located and the horizontal plane is set by the user or automatically generated, and the angle between the straight line and the horizontal plane remains unchanged when the oblique slice direction is changed. Exemplarily, in this embodiment, the preset angle is selected as 45°, and the preset oblique slice direction is rotated 45° clockwise/counterclockwise around the vertical direction each time to obtain the rotated oblique slice direction, according to the rotated oblique slice direction Re-slice the 3D model in the oblique slice direction to obtain new slice layer data; repeat the above steps 8 times to obtain slice layer data in 8 different oblique slice directions corresponding to one rotation of the horizontal plane. As shown in Figure 1B, the angle between the straight line where the preset oblique slice direction A1 is located and the horizontal plane is a1, the preset oblique slice direction A1 is rotated around the vertical direction to obtain the rotated oblique slice direction A2, and the rotated oblique slice direction A2 The angle between the straight line and the horizontal plane is a2. Since the angle between the straight line and the horizontal plane of the preset oblique slice direction remains unchanged during rotation, the values of the angle a1 and the angle a2 are equal.

The second type, the direction of the oblique slice is fixed, and the position of the 3D model is changed, which specifically includes the following steps:

B1. Rotate the 3D model around the vertical direction according to the preset angle.

B2. Slicing the rotated 3D model according to the preset oblique slicing direction, and obtaining slice layered data of the 3D model in different oblique slicing directions.

The oblique slice direction is fixed. For example, in this embodiment, the preset angle is selected as 45°, the oblique slice direction is fixed, and the 3D model is rotated 45° clockwise/counterclockwise around the vertical direction to obtain the selected 3D model. , re-slice the 3D model rotated by 45° according to the preset oblique slice direction to obtain new slice layer data; repeat the above steps 8 times to obtain oblique slice scores in 8 different directions corresponding to the 3D model’s rotation on the horizontal plane. layer data.

Further, in an alternative embodiment, if the preset angle is 30°, rotate the preset oblique slice direction 30° clockwise/counterclockwise around the vertical direction, or rotate the 3D model clockwise around the vertical direction /Rotate 30°counterclockwise, repeat 12 times, and obtain slice layered data corresponding to 12 different oblique slice directions. As shown in Figure 1C, the angle between the straight line where the preset oblique slice direction A1 is located and the horizontal plane is a1, the preset oblique slice direction is fixed, and the 3D model C1 is rotated around the vertical direction by the preset angle θ to obtain the rotated 3D For model C2, slice the rotated 3D model C2 according to the preset oblique slice direction A1, and obtain slice layered data of the 3D model in different oblique slice directions.

In the above-mentioned embodiment scheme, re-slicing the 3D model after rotating the preset oblique slicing direction around the vertical direction, and re-slicing the 3D model after rotating the 3D model around the vertical direction are equivalent to different oblique directions Slice the 3D model again.

On the basis of the foregoing embodiments, it also includes:

Changes the angle between the line on which the preset oblique slice orientation lies and the horizontal plane.

In the above embodiments, the angle between the straight line where the oblique slice direction is located and the horizontal plane remains unchanged in both cases. In order to obtain more comprehensive oblique slice layered data, the angle between the straight line where the preset oblique slice direction is located and the horizontal plane is changed. Angle, form a new oblique angle; Let the preset oblique slice direction be the oblique slice direction after the change, re-enter the 3D printer, according to the method provided in the above-mentioned embodiment, obtain the slices of different oblique slice directions of the 3D model in the above two cases Hierarchical data.

As shown in Figure 1D, changing the angle between the straight line where the preset oblique slice direction A1 is located and the horizontal plane is changed to obtain the changed oblique slice direction B1, the angle between the straight line where the preset oblique slice direction A1 is located and the horizontal plane is a1, and the changed The angle between the straight line where the oblique slice direction B1 is located and the horizontal plane is b1, and the values of the angle a1 and the angle b1 are not equal. In this embodiment, the angle b1 is larger than the angle a1 by a predetermined angle. After changing the tilt angle, slice the 3D model again, rotate the changed tilt slice direction B1 around the vertical direction again to obtain the rotated tilt slice direction B2 (not shown), slice the 3D model again, and repeat the above step to obtain slice layered data of different oblique slice directions.

As shown in Figure 1E, change the angle between the line where the preset oblique slice direction A1 is located and the horizontal plane to obtain the changed oblique slice direction B1, after changing the oblique angle, re-slice the 3D model, and then fix the oblique slice direction B1 , rotate the 3D model C1 around the vertical direction by a preset angle θ again to obtain a rotated 3D model C2 (not shown), slice the rotated 3D model C2 according to the preset oblique slice direction B1, and obtain the 3D model in different Sliced hierarchical data with oblique slice orientation.

Step 120 , for each oblique slice direction, determine the amount of support required to be added to the 3D model in the current oblique slice direction according to slice layer data in the current oblique slice direction.

After the 3D model determines the oblique slicing direction, the oblique layered data of the 3D model sliced in the current oblique slicing direction can be obtained, so that the amount of support required to be added to the 3D model in the current oblique slicing direction can be obtained according to the sliced layered data. The support structure is generated from the surface to be supported all the way down to the plane where the starting point of the z-axis is located. Correspondingly, the larger the area to be supported of the 3D model, the farther the support surface is from the starting point of the Z-axis, that is, the higher the suspension height with the support surface , the larger the volume of the support structure that needs to be produced during printing, that is, the greater the support amount. The support will not only increase the amount of consumables and increase the printing time, but the 3D model and the support are too close to each other, which will also cause the support to be difficult to peel off.

Wherein, step 120 specifically includes:

Step 121 , according to the slice layer data of the current oblique slice direction, determine the surface to be supported for which support needs to be added for each slice layer.

Step 121 specifically includes the following steps:

S1. Perform Boolean operations on the projection of the nth layer slice and the projection of the (n+1)th layer slice; where n is the number of layers where the slices of the 3D model are located, and n is a positive integer.

The area difference between the projection of the (n+1)th layer slice and the projection of the nth layer slice can be obtained through Boolean operations.

S2. If the calculation result is that the projection of the (n+1)th layer slice is larger than the projection of the nth layer slice, then according to the projection of the (n+1)th layer slice and the nth layer slice The difference of the projection corresponds to the connectivity of the surface, and the dangling surface of the (n+1)th layer slice is determined.

If the projection of the (n+1)th layer slice is less than or equal to the projection of the nth layer slice, the (n+1)th layer slice can be supported by the nth layer slice, and the (n+1)th layer slice does not need to be supported; If the projection of the (n+1)th layer slice is larger than the projection of the nth layer slice, the (n+1)th layer slice may have a suspended surface that needs to be supported. According to the projection of the (n+1)th layer slice and the At least one corresponding surface on the (n+1)th layer slice is determined by the difference of the projections of the n-layer slices, and then the dangling surface is determined according to the connectivity of the corresponding surfaces.

S3. According to the suspended surface, determine the surface to be supported that needs to be supported for the (n+1)th layer slice.

Not all suspended surfaces need to be supported. After determining the suspended surfaces, it is necessary to further determine the suspended surfaces that need to be supported.

The specific methods for determining the surface to be supported according to the suspended surface include:

The suspended surface is the part of the (n+1)th layer slice that protrudes from the nth layer slice. If the length of the current suspended surface along the printing line direction is longer, that is, when the 3D printer prints along the printing line direction, the ( The consumables in the molten state of the n+1) slice are more protruding than the nth slice, and the protruding molten consumables are too late to solidify. Affected by gravity, the consumables will fall down, which will cause the 3D model to deform; therefore, get the current The length of the floating surface along the direction of the printing line is compared with the preset threshold. In the preset threshold area, due to factors such as the viscosity of the printing material and the curing speed, the slice of the nth layer can affect the slice of the (n+1)th layer. This part does not need support, and the area larger than the preset threshold is used as the support surface that needs to be added.

Further, in an alternative embodiment, according to the slice layer data of the current oblique slice direction, determine the surface to be supported that needs to be added for each slice layer, and also includes:

Divide the nth layer slice and the (n+1)th layer slice into multiple small polygons;

Determine whether all polygons of the (n+1)th layer slice have the polygon support of the nth layer slice;

If the polygon of the (n+1)th layer slice does not have the polygon support of the nth layer slice, then it is determined that the polygon is a suspended polygon;

According to the connectivity of the suspended polygons of multiple (n+1)th layer slices, determine the suspended surfaces of the (n+1)th layer slices;

After obtaining the slice layer data of the current oblique slice direction, each slice layer can be divided into multiple small polygons. If the polygon is suspended, that is, there is no other layer of polygons below the polygon, then this polygon is a polygon that needs to be supported; if part of the polygon is in contact with polygons of other layers below, and the other part is suspended, it is necessary to judge whether it needs to be added according to the distance of the suspension The support structure is specifically judged according to the above step S3.

By traversing all the polygons that make up the (n+1)th layer slice, you can get all the support surfaces that need to be supported in this slice layer, and by traversing all the slice layers that make up the 3D model, you can get all the supports that need to be added in this 3D model the surface to be supported.

Step 122. For each slice layer, obtain the support area corresponding to the surface to be supported of the current slice layer, and the suspended height of points on the surface to be supported; determine the current slice layer according to the support area and the suspended height the amount of support.

If there is no other slice layer below the surface to be supported in the z-axis direction, the suspended height of the point on the surface to be supported is the distance from the center point of the surface to be supported to the hot bed, that is, the value of the z coordinate of the center point of the surface to be supported ; If there are other slice layers below the surface to be supported in the direction of the z-axis, obtain the corresponding point on the nearest slice layer below the center point of the surface to be supported, and obtain the distance between the two points, and determine the suspended distance as this The difference between the z-coordinates of the two points.

The support amount of the support structure is the obtained volume of the support structure of the support surface, the height of the generated support structure can be obtained according to the suspended height of the support surface, and the product of the support area corresponding to the support surface and the suspended height of the support surface can be calculated Get the support amount of the current slice layer.

Step 123 , according to the support amount of each slice layer, determine the amount of support required to be added to the 3D model in the current oblique slice direction.

The support amount of each slice layer is obtained, and the total support amount required to be added to the 3D model in the current inclined slice direction is obtained by accumulating.

Step 130, determining the target slice direction corresponding to the minimum support amount.

Determine the oblique slice direction corresponding to the minimum support amount from the support amounts corresponding to the obtained different oblique slice layered data, determine it as the target slice direction, and print according to this oblique slice direction, the 3D model requires the least amount of support, for 3D The surface accuracy of the model is minimally affected.

Step 140: Generate a print file of the 3D model according to the slice layer data corresponding to the target slice direction.

Obtain the oblique layered data of the 3D model in the target slice direction, determine each slice layer and printing path according to the oblique layered data, and print the 3D model by adjusting the nozzle angle according to the oblique layered data.

In the technical solution of this embodiment, by obtaining the slice layer data of the 3D model in different oblique slice directions; Supporting amount of support; determining the target slice direction corresponding to the minimum support amount; generating a print file of the 3D model according to slice layer data corresponding to the target slice direction. Solve the problems of increased amount of consumables and increased printing time caused by more support structures, difficult to peel off the support, and affect the surface accuracy of the model after peeling off, realize model printing in the slice direction with the least support, improve model printing speed, and reduce printing materials And the effect of improving the printing accuracy of the model surface.

Embodiment two

Fig. 2 is a schematic structural diagram of a 3D printing file generating device provided in Embodiment 2 of the present invention. As shown in Fig. 2, a 3D printing file generating device includes:

The slice layer data acquisition module 210 is configured to acquire slice layer data of the 3D model in different oblique slice directions.

Optionally, the slice layered data acquisition module 210 includes a first slice layered data acquisition submodule and a second slice layered data acquisition submodule;

Optionally, the first slice layered data acquisition submodule includes:

The first rotating unit is configured to rotate the preset oblique slice direction around the vertical direction according to the preset angle; wherein, the angle between the line where the preset oblique slice direction is located and the horizontal plane remains unchanged.

The first slicing unit is configured to respectively slice the 3D model according to the rotated oblique slicing direction, and acquire slice layered data of the 3D model in different oblique slicing directions.

Optionally, the second slice hierarchical data acquisition submodule includes:

The second rotating unit is used to rotate the 3D model around the vertical direction according to a preset angle.

The second slicing unit is configured to respectively slice the rotated 3D model according to preset oblique slicing directions, and obtain slice layered data of the 3D model in different oblique slicing directions.

In the above embodiment, re-slicing the 3D model after rotating the preset oblique slicing direction around the vertical direction, and re-slicing the 3D model after rotating the 3D model around the vertical direction are equivalent to performing different oblique directions. Slice the 3D model again.

Optionally, the device for generating the 3D printing file also includes:

The oblique angle transformation module is used to change the angle between the straight line where the preset oblique slice direction is located and the horizontal plane.

The slice layer data acquisition and updating module is configured to make the preset oblique slice direction the changed oblique slice direction, and re-enter the acquired slice layer data of the 3D model in different oblique slice directions.

The support amount acquisition module 220 is configured to, for each oblique slice direction, determine the amount of support that needs to be added to the 3D model in the current oblique slice direction according to the slice layer data of the current oblique slice direction.

Optionally, the supporting amount obtaining module 220 includes:

The support surface acquisition sub-module is used to determine the surface to be supported for which support needs to be added for each slice layer according to the slice layer data of the current inclined slice direction.

The projection acquiring unit is configured to perform a Boolean operation on the projection of the nth layer slice and the projection of the (n+1)th layer slice; wherein, n is the number of layers where the slices of the 3D model are located, and n is a positive integer.

The suspended surface acquisition unit is used for if the calculation result is that the projection of the (n+1)th layer slice is larger than the projection of the nth layer slice, then according to the projection of the (n+1)th layer slice and the The difference of the projected difference of the nth layer slice corresponds to the connectivity of the surface, and the dangling surface of the (n+1)th layer slice is determined.

The surface-to-be-supported determining unit is configured to determine, according to the suspended surface, the surface to be supported to which support needs to be added for the (n+1)th slice.

Optionally, the unit to be supported surface determination also includes:

The sub-unit for obtaining the length of the printing trace on the floating surface is used for obtaining the length of the current floating surface along the printing trace direction for each floating surface.

The judging and determining sub-unit is configured to use an area whose length along the printing line direction is greater than a preset threshold as a support surface to be added with support.

Optionally, the supporting amount obtaining module 220 also includes:

The slice layer support acquisition sub-module is used to obtain, for each slice layer, the support area corresponding to the surface to be supported of the current slice layer, and the suspended height of points on the surface to be supported; according to the support area and the Overhang height, which determines the support amount of the current slice layer.

The total support amount determining submodule is used to determine the amount of support required to be added to the 3D model in the current inclined slice direction according to the support amount of each slice layer.

The target slice direction determination module 230 is configured to determine the target slice direction corresponding to the minimum support amount.

Determine the slice direction corresponding to the minimum support amount from the support amounts corresponding to the preset number of slice directions, and determine it as the target slice direction. Under this slice direction, the support amount required for printing the 3D model is the least, and the surface of the 3D model is affected. minimal impact.

The print file generation module 240 is configured to generate a print file of the 3D model according to the slice layer data corresponding to the target slice direction.

Obtain the oblique layer data of the 3D model in the target slice direction, determine each slice layer and printing path according to the oblique layer data, and print the 3D model by adjusting the nozzle angle according to the oblique layer data.

The device for generating a 3D printing file provided by an embodiment of the present invention can execute the method for generating a 3D printing file provided by any embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the method.

Embodiment three

Fig. 3 is a schematic structural diagram of a 3D printing file generating device provided in Embodiment 3 of the present invention. As shown in Fig. 3 , the 3D printing file generating device includes a processor 30, a memory 31, an input device 32 and an output device 33 The number of processors 30 in the generating device of 3D printing files can be one or more, and one processor 30 is taken as an example in Fig. 3; the processor 30, memory 31, input device 32 and The output device 33 can be connected via a bus or in other ways. In FIG. 3 , connection via a bus is taken as an example.

As a computer-readable storage medium, the memory 31 can be used to store software programs, computer-executable programs and modules, such as program instructions/modules corresponding to the method for generating 3D printing files in the embodiment of the present invention (for example, 3D printing file Slice layered data acquisition module 210, support amount acquisition module 220, target slice direction determination module 230 and print file generation module 240) in the generation device. The processor 30 executes various functional applications and data processing of the 3D printing file generating device by running the software programs, instructions and modules stored in the memory 31 , that is, realizes the above-mentioned 3D printing file generating method.

The memory 31 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required by a function; the data storage area may store data created according to the use of the terminal, and the like. In addition, the memory 31 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage devices. In some examples, the storage 31 may further include storages that are remotely located relative to the processor 30, and these remote storages may be connected to a device for generating 3D printing files through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The input device 32 can be used to receive input numbers or character information, and generate key signal input related to user settings and function control of the 3D printing file generation device. The output device 33 may include a display device such as a display screen.

Embodiment Four

Embodiment 4 of the present invention also provides a storage medium containing computer-executable instructions, and the computer-executable instructions are used to execute a method for generating a 3D printing file when executed by a computer processor. The method includes:

Certainly, the storage medium containing computer-executable instructions provided by the embodiments of the present invention, the computer-executable instructions are not limited to the method operations described above, and can also perform the generation of 3D printing files provided by any embodiment of the present invention. Related operations in the method.

Through the above description about the implementation mode, those skilled in the art can clearly understand that the present invention can be realized by means of software and necessary general-purpose hardware, and of course it can also be realized by hardware, but in many cases the former is a better implementation mode . Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a floppy disk of a computer , read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), flash memory (FLASH), hard disk or optical disc, etc., including several instructions to make a computer device (which can be a personal computer) , server, or network device, etc.) execute the method described in each embodiment of the present invention.

It should be noted that, in the embodiment of the above-mentioned 3D printing file generation device, each unit and module included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be realized; In addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the protection scope of the present invention.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims

A method for generating a 3D printing file, comprising:

Obtain the slice layer data of the 3D model in different oblique slice directions;

For each oblique slice direction, according to the slice layer data of the current oblique slice direction, determine the amount of support that needs to be added to the 3D model in the current oblique slice direction;

Determine the target slice direction corresponding to the minimum support amount;

A print file of the 3D model is generated according to the slice layer data corresponding to the target slice direction.
The method for generating a 3D printing file according to claim 1, wherein, according to the layered slice data of the current oblique slice direction, determining the amount of support required to be added to the 3D model in the current oblique slice direction includes :

According to the slice layer data of the current oblique slice direction, determine the surface to be supported that needs to be added for each slice layer;

For each slice layer, obtain the support area corresponding to the surface to be supported of the current slice layer, and the suspended height of points on the surface to be supported; determine the support amount of the current slice layer according to the support area and the suspended height ;

According to the support amount of each slice layer, the support amount required to be added to the 3D model in the current oblique slice direction is determined.
The method for generating a 3D printing file according to claim 2, characterized in that, according to the slice layer data of the current oblique slice direction, determining the surface to be supported that needs to be added for each slice layer includes:

Perform Boolean operations on the projection of the nth layer slice and the projection of the (n+1)th layer slice; where n is the number of layers where the slice of the 3D model is located, and n is a positive integer;

If the operation result is that the projection of the (n+1)th layer slice is larger than the projection of the nth layer slice, then according to the projection of the (n+1)th layer slice and the projection of the nth layer slice The connectivity of the surface corresponding to the difference value determines the dangling surface of the (n+1)th layer slice;

According to the suspended surface, determine the surface to be supported on which the (n+1)th slice needs to be supported.
The method for generating a 3D printing file according to claim 3, wherein, according to the suspended surface, determining the surface to be supported for the (n+1)th layer slice to be supported includes:

For each floating surface, obtain the length of the current floating surface along the printing line direction;

The area whose length along the printing line direction is greater than the preset threshold is taken as the supporting surface where support needs to be added.
The method for generating a 3D printing file according to claim 1, wherein said obtaining slice layered data of the 3D model in different oblique slice directions comprises:

According to the preset angle, the preset oblique slice direction is rotated around the vertical direction; wherein, the angle between the straight line where the preset oblique slice direction is located and the horizontal plane remains unchanged;

The 3D model is respectively sliced according to the rotated oblique slicing direction, and slice layered data of the 3D model in different oblique slicing directions are obtained.
The method for generating a 3D printing file according to claim 1, wherein said obtaining slice layered data of the 3D model in different oblique slice directions comprises:

Rotate the 3D model around the vertical direction according to the preset angle;

The rotated 3D model is respectively sliced according to the preset oblique slicing direction, and slice layered data of the 3D model in different oblique slicing directions are obtained.
The method for generating 3D printing files according to claim 5 or 6, wherein, for each oblique slice direction, according to the slice layer data of the current oblique slice direction, it is determined that the 3D model is in the current oblique slice direction Before the amount of support needed to add support, also include:

Change the angle between the line where the preset oblique slice direction is located and the horizontal plane;

Let the preset oblique slice direction be the changed oblique slice direction, and re-enter the acquisition of slice layered data of the 3D model in different oblique slice directions.
A generating device for 3D printing files, characterized in that it comprises:

The slice layered data acquisition module is used to obtain the slice layered data of the 3D model in different oblique slice directions;

The support amount acquisition module is used to determine the amount of support that needs to be added to the 3D model in the current oblique slice direction according to the slice layer data of the current oblique slice direction for each oblique slice direction;

A target slice direction determining module, configured to determine the target slice direction corresponding to the minimum support amount;

A print file generating module, configured to generate a print file of the 3D model according to the slice layer data corresponding to the target slice direction.
A device for generating 3D printing files, characterized in that the device for generating 3D printing files includes:

one or more processors;

memory for storing one or more programs;

When the one or more programs are executed by the one or more processors, the one or more processors implement the method for generating a 3D printing file according to any one of claims 1-7.
A computer-readable storage medium, on which a computer program is stored, characterized in that, when the program is executed by a processor, the method for generating a 3D printing file according to any one of claims 1-7 is realized.