CN109263049B - Method, device and system for automatically adding connecting rod - Google Patents
Method, device and system for automatically adding connecting rod Download PDFInfo
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- CN109263049B CN109263049B CN201811287977.0A CN201811287977A CN109263049B CN 109263049 B CN109263049 B CN 109263049B CN 201811287977 A CN201811287977 A CN 201811287977A CN 109263049 B CN109263049 B CN 109263049B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/40—Structures for supporting 3D objects during manufacture and intended to be sacrificed after completion thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
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Abstract
The invention discloses a method, a device and a system for automatically adding a connecting rod, wherein the method comprises the following steps: firstly, traversing the current support, and taking the support with the distance from the current latest support within a preset distance range as a target support; then, calculating the height and the number of connecting rods to be added; and finally, gradually generating connecting rods between the current latest support and the target support from the current starting point according to the preset angle and diameter until the number of the prepared additions is reached. Then, new supports are added again, and connecting rods are added again on the new supports until all supports and connecting rods are added. According to the invention, the connecting rod is added on the support, so that the stability of the support can be effectively improved, and the molding rate of the model is improved; moreover, the number and the volume of the supports do not need to be additionally increased, so that the supports can be conveniently removed by a user after the 3D model is printed.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a method, a device and a system for automatically adding a connecting rod.
Background
In photocuring 3D printing technique, the 3D printer is according to the section figure, the printing model of one deck, and the printing in-process need add the support to hollow position, guarantees that the model prints successfully, but, always some supports can not live unsettled place because weight, so the final printing effect is seriously influenced to the quality of support.
But because 3D printing material is comparatively expensive, it is troublesome scheduling problem again to clear away the support after the model printing is accomplished, so, can not add the support for all hollow positions of model, but add some supports for some key or especially outstanding hollow positions. However, if the supporting volume is increased, the contact area between the support and the model is increased, and the difficulty of removing the support is increased.
Therefore, in order to solve the problems that in the prior art, too much support quantity increases printing cost, too little support quantity does not have a good support effect, a method for effectively improving support stability without increasing support quantity and volume is necessary, consumables can be reduced, and cost is reduced.
Disclosure of Invention
The invention aims to provide a method and a device for automatically adding a connecting rod and a 3D printing system, which can effectively improve the support stability.
In order to solve the technical problem, the invention discloses a method for automatically adding a connecting rod, which comprises the following steps:
s1: traversing the current support, and taking the support with the distance from the current latest support within a preset distance range as a target support;
s2: calculating to obtain the height of the connecting rod according to a preset angle and the distance between the current latest support and the target support;
s3: calculating to obtain the number of prepared additions according to the height and the total height of the connecting rods; the total height is the height difference between a higher point in the top points of the current latest support and the target support and a lower point in the bottom points of the current latest support and the target support, or the height difference between the lower point in the top points of the current latest support and the target support and the lower point in the bottom points of the current latest support and the target support after a preset first reserved height is subtracted from the lower point, or the height difference between the lower point in the top points of the current latest support and the lower point in the bottom points of the current latest support and the target support after a preset second reserved height is;
s4: generating a first connecting rod for connecting the current latest support and the target support according to the preset angle and the preset diameter from the current starting point; the current starting point is a higher point in the vertexes of the current latest support and the target support, or a position point mapped on the support with the higher vertex after a preset first reserved height is subtracted from a lower point in the vertexes of the current latest support and the target support;
s5: and generating a second connecting rod and more than the second connecting rod which are used for connecting the current latest support and the target support according to the preset angle and the preset diameter by taking the terminal point of the previous connecting rod as a starting point until the number of the connecting rods reaches the prepared adding number.
Wherein, before the step S1, the method further comprises the step S0: acquiring a support distance range set by a user as the preset distance range; acquiring an included angle between a connecting rod and a support, which is set by a user, as the preset angle; acquiring a first reserved height and a second reserved height set by a user as the preset first reserved height and second reserved height; and acquiring the diameter of the connecting rod set by the user as the preset diameter.
In step S2, the height of the connecting rod is a projection height of the connecting rod in the vertical direction, and a product of a distance between the current latest support and the target support and a tangent trigonometric function value of the preset angle is used as the height of the connecting rod.
Wherein, in the step S3, the total height is divided by the height of the connecting rod to obtain a quotient, and the quotient is used as the preliminary adding quantity.
In order to solve the technical problem, the invention also discloses a device for automatically adding the connecting rod, which comprises a support generation module, a connecting rod calculation module and a connecting rod generation module;
the support generation module is used for generating a support on the 3D model;
the connecting rod calculation module is used for traversing the current support generated by the support generation module and taking the support with the distance from the current latest support within a preset distance range as a target support; calculating to obtain the height of the connecting rod according to a preset angle and the distance between the current latest support and the target support; and calculating to obtain the number of prepared additions according to the height and the total height of the connecting rods; the total height is the height difference between a higher point in the top points of the current latest support and the target support and a lower point in the bottom points of the current latest support and the target support, or the height difference between the lower point in the top points of the current latest support and the target support and the lower point in the bottom points of the current latest support and the target support after a preset first reserved height is subtracted from the lower point, or the height difference between the lower point in the top points of the current latest support and the lower point in the bottom points of the current latest support and the target support after a preset second reserved height is;
the connecting rod generating module is used for generating a first connecting rod for connecting the current latest support and the target support from the current starting point according to the preset angle and the preset diameter; generating a second connecting rod or more between the current latest support and the target support according to the preset angle and the preset diameter by taking the terminal point of the previous connecting rod as a starting point until the number of the connecting rods reaches the prepared adding number; and the current starting point is a higher point in the vertexes of the current latest support and the target support, or is a position point mapped on the support with the higher vertex after a preset first reserved height is subtracted from the lower point in the vertexes of the current latest support and the target support.
The device also comprises a connecting rod parameter setting module, a parameter setting module and a parameter setting module, wherein the connecting rod parameter setting module is used for acquiring a supporting distance range set by a user as the preset distance range; acquiring an included angle between a connecting rod and a support, which is set by a user, as the preset angle; acquiring a first reserved height and a second reserved height set by a user as the preset first reserved height and second reserved height; and acquiring the diameter of the connecting rod set by the user as the preset diameter.
And taking the product of the distance between the current latest support and the target support and the tangent trigonometric function value of the preset angle as the height of the connecting rod.
Wherein the preliminary addition amount is a quotient of the total height divided by the connecting rod height.
In order to solve the technical problem, the invention also discloses a 3D printing design system, which comprises a model file importing module for importing the 3D model file, a slice file generating module and the device for automatically adding the connecting rod, wherein the model file importing module is used for importing the 3D model file; and the slicing file generation module is used for generating the corresponding slicing file suitable for 3D printing from the three-dimensional stereo graph formed by the 3D model and the support and the connecting rod generated by the automatic connecting rod adding device according to an instruction for generating the slicing file.
In order to solve the technical problem, the invention further discloses a photocuring 3D printing system, which comprises a photocuring 3D printer and the 3D printing design system; and the photocuring 3D printer receives the slice file generated by the 3D printing design system and prints the support, the connecting rod and the 3D model.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the connecting rod is added on the support, so that the stability of the support can be effectively improved, and the molding rate of the model is improved; moreover, the number and the volume of the supports do not need to be additionally increased, so that the supports can be conveniently removed by a user after the 3D model is printed.
Drawings
FIG. 1 is a diagram of the method steps for automatically adding connecting rods in accordance with one embodiment of the present invention;
FIG. 2 is a diagram of the method steps for automatically adding connecting rods in accordance with another embodiment of the present invention;
FIG. 3 is a diagrammatic illustration of an add-on connector bar in accordance with an embodiment of the present invention;
FIG. 4 is a diagrammatic illustration of an additional connecting rod of another embodiment of the present invention;
FIG. 5 is a diagrammatic illustration of an add-on tie bar of a further embodiment of the present invention;
FIG. 6 is a block diagram of an automatic tie bar adding apparatus according to an embodiment of the present invention;
fig. 7 is a structural diagram of a 3D printing design system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, unless otherwise specified, the use of the terms of orientation such as "upper, lower, left, and right" generally refers to upper, lower, left, and right in the drawings, and "inner and outer" refer to inner and outer relative to the outline of the component.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances and may be performed in an order other than that described in the embodiments of the invention.
As shown in fig. 1, the method for automatically adding a connecting rod of the present embodiment includes the following steps:
s1: traversing the current support, and taking the support with the distance from the current latest support within a preset distance range as the target support.
Specifically, as shown in fig. 3, after the 3D model file is imported, first a first root support 31 is generated on the model 1, and parameters such as the position and size of the support 31 to be added may be manually set by the user, or the first root support 31 may be generated by parameters built in the system. Wherein the support parameters include, but are not limited to: support position information, support diameter, support height, etc.
After the first support 31 is generated, step S1 is started, and the process does not proceed to step S2 because there is no other support. In addition, in another embodiment of the present invention, when there is only one support, the current support is not traversed, i.e., step S1 is not performed.
Continuing to add the second root support 32 according to the method for generating the first root support 31, after generating the second root support 32, starting to execute step S1, determining whether the distance Cd between the current latest support (i.e. the 2 nd root support) 32 and the first root support 31 is within the preset distance range, if so, taking the first root support 31 as the target support, and proceeding to step S2; otherwise, the next support continues to be added. In another embodiment of the present invention, when there are more than two supports, all the supports except itself (i.e. the current latest support) are traversed in step S1.
In this embodiment, a specific distance range may be preset in the system, and a person skilled in the art may set a specific value according to actual situations without affecting the implementation of the present invention.
In addition, in another embodiment of the present invention, when there are 3 or more supports, the support having the shortest distance from the current latest support within the range of the distance may be used as the target support.
In addition, as shown in fig. 2, the range of the distance between the two supports to which the connecting rod can be added can also be set by the user, specifically, step S0 is included before step S1: and acquiring a support distance range set by a user as the preset distance range. The user can set specific numerical values according to actual conditions.
S2: and calculating to obtain the height of the connecting rod according to a preset angle and the distance between the current latest support and the target support.
Specifically, in the embodiment of the present invention, the height of the connecting rod is a projection height of the connecting rod in the vertical direction. According to the formula of the cotangent trigonometric function, the connecting rod height Hd is cot (θ) x Cd. And Cd is the distance between the current latest support and the target support.
In this embodiment, the preset angle is an angle θ of an included angle between the connecting rod and the support, and may be preset in the system, specifically, a person skilled in the art may set a specific numerical value according to an actual situation, without affecting the implementation of the present invention.
In addition, as shown in fig. 2, the angle θ between the connecting rod and the support may also be set by the user, and specifically, step S0 before step S1 further includes: and acquiring the angle of an included angle between the connecting rod and the support set by the user as the preset angle theta. The user can set specific numerical values according to actual conditions.
In another embodiment of the present invention, the step of obtaining the angle between the connecting rod and the support set by the user as the preset angle θ is performed after step S1 and before step S2.
After the height of the tie bar is calculated in step S2, the process proceeds to step S3.
S3: calculating to obtain the number of prepared additions according to the height and the total height of the connecting rods;
specifically, in the present embodiment, as shown in fig. 3, the total height H is a height difference between a higher point of the top points of the current newest support 32 and the target support 31 and a lower point of the bottom points thereof. The higher point of the two vertexes is the point Lm1 with higher height in the centers (vertexes) of the two top surfaces. Since the bottom surfaces of the current newest support 32 and the target support 31 are at the same horizontal plane, the lower point Ln1 of the bottom points of the current newest support 32 and the target support 31 can be the center of the bottom surface of the current newest support 32 or the center of the bottom surface of the target support 31. The preliminary addition amount is equal to the height difference between the upper point Lm1 and the lower point Ln1 (i.e., the total height H) divided by the tie bar height Hd, resulting in a quotient, ignoring the remainder. The height difference refers to a height difference in the vertical direction.
In another embodiment of the present invention, as shown in fig. 4, the total height H is the lower point of the vertices of the current latest support 32 and the target support 31 minus a preset first reserved height H1The height difference between the bottom point and the lower point of the two points; wherein the lower point of the two vertexes is the lower height point Lm2 of the center (vertex) of the top surface of both the current newest support 32 and the target support 31. In addition, since the bottom surfaces of the current newest support 32 and the target support 31 are at different horizontal planes, the lower point Ln2 of the bottom points is the center of the bottom surface of the target support 31. The number of preliminary additions being equal to the height of the point Lm2 minus the first reserved height h1Then, the height difference (i.e. total height H) from the lower point Ln2 is divided by the height Hd of the connecting rod, and the quotient is obtained, and the remainder is ignored. The height difference refers to a height difference in the vertical direction. In another embodiment of the present invention, as shown in FIG. 5, the total height H is the lower point of the vertices of the current latest support 32 and the target support 31 minus a preset first reserved height H1Then adding a preset second reserved height h to the higher point of the two bottom points2And then the height difference between the two. Wherein the lower point of the two vertexes is the lower height point Lm3 of the center (vertex) of the top surface of both the current newest support 32 and the target support 31. In addition, since the bottom surfaces of the current latest support 32 and the target support 31 are at different horizontal planes, the higher point Ln3 of the bottom points is the center of the bottom surface of the current latest support 32, and the point Ln3 plus the second reserved height h2And then an end point Fin is obtained. The number of preliminary additions being equal to the height of the point Lm3 minus the first reserved height h1The height difference from the end point Fin (i.e., the total height H) is divided by the connecting rod height Hd, and the quotient is obtained, ignoring the remainder. Wherein the height difference isRefers to the height difference in the vertical direction.
In particular, the first predetermined height h1And a second predetermined height h2Can be preset in the system, and the technicians in the field can set specific numerical values according to actual conditions without influencing the implementation of the invention.
In addition, as shown in fig. 2, the first reserved height h1And a second predetermined height h2The step S0 before the step S1 may also include: acquiring a first reserved height and a second reserved height set by a user as the preset first reserved height h1And a second predetermined height h2. The user can set specific numerical values according to actual conditions.
In another embodiment of the present invention, the step of acquiring the first reserved height and the second reserved height set by the user as the preset first reserved height and second reserved height is performed after step S1 and before step S3.
Wherein the first reserved height h1And a second predetermined height h2The values may be the same or different. If the calculated total height H is a negative number, reminding the user to modify the first reserved height H1And a second predetermined height h2And obtaining parameters set by the user again; or directly returning to the step S1 to traverse the current support again and select other target supports; or adding no connecting rod, and returning to the step S1 after a new support is generated subsequently, and selecting a corresponding target support to add the connecting rod. After the preliminary addition amount is calculated in this step S3, the process proceeds to step S4.
S4: generating a first connecting rod for connecting the current latest support and the target support according to the preset angle and the preset diameter from the current starting point;
specifically, the preset diameter is the diameter of the connecting rod and can be preset in the system, and a person skilled in the art can set a specific numerical value according to actual conditions without affecting the implementation of the invention. Typically, the connecting rod diameter is smaller than the diameter of the support.
In addition, as shown in fig. 2, the diameter of the connecting rod may also be set by the user, specifically, step S0 before step S1 further includes: and acquiring the diameter of the connecting rod set by the user as the preset diameter. The user can set specific values according to actual conditions, and the diameter of the connecting rod should be smaller than that of the support.
In another embodiment of the present invention, the step of acquiring the diameter of the connection rod set by the user as the preset diameter is performed after step S1 and before step S4.
In the embodiment of the present invention, as shown in fig. 3, the current starting point is a point Lm1 having a higher height among the centers (vertices) of the top surfaces of both the current latest support 32 and the target support 31. Starting from the current starting point Lm1, a first connecting rod 41 connecting the current latest support 32 and the target support 31 is generated according to a preset angle θ and a preset diameter. In the present embodiment, the connecting rod 41 is cylindrical. Those skilled in the art can also arrange the connecting rod to be a long strip with edges and corners, or other shapes, without affecting the implementation of the invention.
In another embodiment of the present invention, as shown in fig. 4, the current starting point is the point Lm2 with the lower height in the circle centers (vertexes) of the top surfaces of the current latest support 32 and the target support 31, minus the preset first reserved height h1Thereafter, the position point Be on the support 32 whose vertex is higher is mapped. Starting from the current starting point Be, a first connecting rod 41 connecting the current latest support 32 and the target support 31 is generated according to a preset angle θ and a preset diameter. In this embodiment, the connecting rod 41 is also cylindrical. Those skilled in the art can also arrange the connecting rod to be a long strip with edges and corners, or other shapes, without affecting the implementation of the invention.
S5: and generating a second connecting rod and more than the second connecting rod which are used for connecting the current latest support and the target support according to the preset angle and the preset diameter by taking the terminal point of the previous connecting rod as a starting point until the number of the connecting rods reaches the prepared adding number.
Specifically, after the first connecting rod 41 is generated, the second connecting rod 42 can be generated from the end point En of the first connecting rod 41, and the diameter, the angle, the height and the shape are the same as those of the first connecting rod 41. And so on, the third connecting rod and the subsequent connecting rod are generated at the end point of the previous connecting rod until the number of the connecting rods reaches the number of the prepared additions calculated in the step S3.
To this end, the system has completed the addition of the connecting rods between the first 31 and second 32 supports. And then, continuously adding a third support, and continuously searching for the target support with the distance between the third support and the target support within the preset distance range. And so on until the required support and connecting rod are added.
As further shown in fig. 6, the apparatus for automatically adding a connecting rod according to an embodiment of the present invention includes a support generation module, a connecting rod calculation module, and a connecting rod generation module.
The support generation module is used for generating a support on the 3D model;
the connecting rod calculation module is used for traversing the current support generated by the support generation module and taking the support with the distance from the current latest support within a preset distance range as a target support; calculating to obtain the height of the connecting rod according to a preset angle and the distance between the current latest support and the target support; and calculating to obtain the number of prepared additions according to the height and the total height of the connecting rods;
the connecting rod generating module is used for generating a first connecting rod for connecting the current latest support and the target support from the current starting point according to the preset angle and the preset diameter; and generating a second connecting rod and more than the second connecting rod which are used for connecting the current latest support and the target support according to the preset angle and the preset diameter by taking the terminal point of the previous connecting rod as a starting point until the number of the connecting rods reaches the prepared adding number.
Specifically, after the 3D model file is imported, the support generation module obtains support parameters set by the user, and generates a first support on the 3D model according to the support parameters. In addition, the support generation module can also generate a first support on the 3D model according to the support parameters built in the system. Wherein the support parameters include, but are not limited to: support position information, support diameter, support height, etc.
After the first support 31 is generated, the connecting-rod calculation module starts traversing the current support, since there is no other support, so there is no target support. Additionally, in another embodiment, when there is only one support, the tie-bar computation module does not traverse the current support; when more than two supports exist, all the supports except the support (namely the current latest support) are traversed.
The support generation module continues to generate a second support according to the method, the connecting rod calculation module starts to traverse the current support again, whether the distance Cd between the current latest support (namely the 2 nd support) 32 and the first support 31 is within a preset distance range is judged, and if so, the first support 31 is taken as a target support; otherwise, the next support is continuously added, and so on.
In this embodiment, a specific distance range may be preset in the system, and a person skilled in the art may set a specific value according to actual situations without affecting the implementation of the present invention.
In addition, in another embodiment of the present invention, when there are 3 or more supports, the connecting rod calculation module takes the support having the shortest distance to the current latest support as the target support within the range of the distance.
In another embodiment of the present invention, the distance range may also be set by a user, and therefore, as shown in fig. 6, the apparatus further includes a connecting rod parameter setting module, configured to obtain the support distance range set by the user, as the preset distance range. The user can set specific numerical values according to actual conditions.
After the target support is selected, the connecting rod calculation module starts to calculate the height of the connecting rod, specifically, in the embodiment of the present invention, the height of the connecting rod is the projection height of the connecting rod in the vertical direction. According to the formula of the cotangent trigonometric function, the connecting rod height Hd is cot (θ) x Cd. And Cd is the distance between the current latest support and the target support.
In this embodiment, the preset angle is an angle θ of an included angle between the connecting rod and the support, and may be preset in the system, specifically, a person skilled in the art may set a specific numerical value according to an actual situation, without affecting the implementation of the present invention.
In addition, the angle theta of the included angle between the connecting rod and the support can also be obtained through user setting, and specifically, the connecting rod parameter setting module is also used for obtaining the angle of the included angle between the connecting rod and the support, which is set by the user, and serving as the preset angle theta.
After the height Hd of the connecting rod is obtained through calculation, the connecting rod calculation module starts to calculate the prepared adding quantity of the connecting rods.
Specifically, in the present embodiment, as shown in fig. 3, the total height H is a height difference between a higher point of the top points of the current newest support 32 and the target support 31 and a lower point of the bottom points thereof. The higher point of the two vertexes is the point Lm1 with higher height in the centers (vertexes) of the two top surfaces. Since the bottom surfaces of the current latest support 32 and the target support 31 are at the same horizontal plane, the lower point Ln1 may be the center of the bottom surface of the current latest support 32 or the center of the bottom surface of the target support 31. The preliminary addition amount is equal to the height difference between the upper point Lm1 and the lower point Ln1 (i.e., the total height H), divided by the tie bar height Hd, resulting in a quotient, ignoring the remainder. The height difference refers to a height difference in the vertical direction.
In another embodiment of the present invention, as shown in fig. 4, the total height H is the height of the lower point of the vertices of the current latest support 32 and the target support 31 minus a preset first reserved height H1The height difference between the bottom point and the lower point of the two points; wherein the lower point of the two vertexes is the lower height point Lm2 of the center (vertex) of the top surface of both the current newest support 32 and the target support 31. In addition, since the bottom surfaces of the current latest support 32 and the target support 31 are at different horizontal planes, the lower point Ln2 is the center of the bottom surface of the target support 31. The number of preliminary additions is equal to the point Lm2 minus the first reserved height h1Then, the height difference (i.e. total height H) from the lower point Ln2 is divided by the height Hd of the connecting rod, and the quotient is obtained, and the remainder is ignored. The height difference refers to a height difference in the vertical direction.
In another embodiment of the present invention, as shown in FIG. 5, the total height H is the lower point of the vertices of both the current newest support 32 and the target support 31 minus a preset first pointHeight h of reservation1Then adding a preset second reserved height h to the higher point of the two bottom points2And then the height difference between the two. Wherein the lower point of the two vertexes is the lower height point Lm3 of the center (vertex) of the top surface of both the current newest support 32 and the target support 31. In addition, since the bottom surfaces of the current latest support 32 and the target support 31 are at different horizontal planes, the higher point Ln3 of the bottom points is the center of the bottom surface of the current latest support 32, and the point Ln3 plus the second reserved height h2And then an end point Fin is obtained. The number of preliminary additions being equal to the height of the point Lm3 minus the first reserved height h1The height difference from the end point Fin (i.e., the total height H) is divided by the connecting rod height Hd, and the quotient is obtained, ignoring the remainder. The height difference refers to a height difference in the vertical direction.
In particular, the first predetermined height h1And a second predetermined height h2Can be preset in the system, and the technicians in the field can set specific numerical values according to actual conditions without influencing the implementation of the invention.
In addition, the first reserved height h1And a second predetermined height h2The connecting rod parameter setting module can also be set by a user, and specifically, the connecting rod parameter setting module is further used for acquiring a first reserved height and a second reserved height set by the user as the preset first reserved height h1And a second predetermined height h2。
First reserved height h1And a second predetermined height h2The values may be the same or different. If the total height H obtained by calculation is a negative number, the connecting rod parameter setting module reminds a user to modify the first reserved height H1And a second predetermined height h2And obtaining parameters set by the user again; or the connecting rod calculation module re-traverses the current support and selects other target supports; or the connecting rod is not added, and after the subsequent support generation module generates a new support, the connecting rod calculation module selects the corresponding target support to add the connecting rod.
And after the calculation of the connecting rod calculation module is completed, the connecting rod generation module generates a first connecting rod for connecting the current latest support and the target support according to the preset angle and the preset diameter from the current starting point.
Specifically, the preset diameter is the diameter of the connecting rod and can be preset in the system, and a person skilled in the art can set a specific numerical value according to actual conditions without affecting the implementation of the invention. Typically, the connecting rod diameter is smaller than the diameter of the support.
In addition, the diameter of the connecting rod can also be set by a user, specifically, the connecting rod parameter setting module is further configured to obtain the diameter of the connecting rod set by the user as the preset diameter.
In the embodiment of the present invention, as shown in fig. 3, the current starting point is a point Lm1 having a higher height among the centers (vertices) of the top surfaces of both the current latest support 32 and the target support 31. The connecting rod generating module generates a first connecting rod 41 connecting the current latest support 32 and the target support 31 according to a preset angle theta and a preset diameter from the current starting point Lm 1. In the present embodiment, the connecting rod 41 is cylindrical. Those skilled in the art can also arrange the connecting rod to be a long strip with edges and corners, or other shapes, without affecting the implementation of the invention.
In another embodiment of the present invention, as shown in fig. 4, the current starting point is the point Lm2 with the lower height in the circle centers (vertexes) of the top surfaces of the current latest support 32 and the target support 31, minus the preset first reserved height h1Thereafter, the position point Be on the support 32 whose vertex is higher is mapped. The connecting rod generating module generates a first connecting rod 41 connecting the current latest support 32 and the target support 31 according to a preset angle theta and a preset diameter from the current starting point Be. In this embodiment, the connecting rod 41 is also cylindrical. Those skilled in the art can also arrange the connecting rod to be a long strip with edges and corners, or other shapes, without affecting the implementation of the invention.
After the first connecting rod 41 is completed, the connecting rod producing module produces a second connecting rod 42 starting from the end En of the first connecting rod 41, with the same diameter, angle, height and shape as the first connecting rod 41. And so on, the third connecting rod and the subsequent connecting rods are generated at the end point of the previous connecting rod until the number of the connecting rods reaches the prepared adding number.
To this end, the present embodiment has completed the addition of the connecting rod between the first support 31 and the second support 32. And when the support generation module continues to add the third support, the connecting rod calculation module, the connecting rod generation module and the connecting rod parameter setting module start to work according to the method. After the connecting rod parameter setting module acquires the parameters set by the user for the first time, if the information of the parameters changed by the user is not received, the system still works according to the parameters acquired for the first time.
As further shown in fig. 7, the 3D printing design system according to the embodiment of the present invention includes a model file importing module, a slice file generating module, and an automatic adding link device.
The model file importing module is used for importing the 3D model file. The 3D model file may be made by existing 3D drawing software, such as STL file, which is a common file format of digital geometry processing software (e.g., CAD).
The automatic add tie bar apparatus is used to generate a support on the 3D model and generate a tie bar on the support. Specifically, the working principle and working process of the automatic adding connecting rod device are described in detail in the foregoing, and are not described herein again.
And the slicing file generation module is used for generating the corresponding slicing file suitable for 3D printing from a three-dimensional stereo graph formed by the 3D model, the support generated by the automatic adding connecting rod device and the connecting rod according to the instruction for generating the slicing file. Specifically, the slicing file generation module cuts the support, the connecting rod and the 3D model into a slicing file suitable for 3D printing, such as a CWS file, by using a slicing algorithm of the prior art.
In addition, the embodiment of the invention also provides a photocuring 3D printing system which comprises a photocuring 3D printer and a 3D printing design system.
The photocuring 3D printer receives the slice file generated by the 3D printing design system in a wireless or wired mode, and prints the support, the connecting rod and the 3D model in a photocuring mode.
The specific printing steps are the same as the printing steps of the photocuring 3D printer in the prior art in terms of working principle.
The working principle and working process of the 3D printing design system have been described in detail in the foregoing, and are not described in detail herein.
In conclusion, the connecting rods are added on the supports, so that the stability of the supports can be effectively improved, and the molding rate of the model is improved; moreover, the number and the volume of the supports do not need to be additionally increased, so that the supports can be conveniently removed by a user after the 3D model is printed.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The objects, technical solutions and advantages of the present invention have been described in detail with reference to the preferred embodiments, it should be understood that the above description is only illustrative of the preferred embodiments of the present invention, and should not be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention, and the scope of the claims of the present invention should be determined by the description of the claims rather than by the limitation of the above embodiments.
Claims (10)
1. A method for automatically adding connecting rods is characterized by comprising the following steps:
s1: traversing the current support, and taking the support with the distance from the current latest support within a preset distance range as a target support;
s2: calculating to obtain the height of the connecting rod according to a preset angle and the distance between the current latest support and the target support;
s3: calculating to obtain the number of prepared additions according to the height and the total height of the connecting rods; the total height is the height difference between a higher point in the top points of the current latest support and the target support and a lower point in the bottom points of the current latest support and the target support, or the height difference between the lower point in the top points of the current latest support and the target support and the lower point in the bottom points of the current latest support and the target support after a preset first reserved height is subtracted from the lower point, or the height difference between the lower point in the top points of the current latest support and the lower point in the bottom points of the current latest support and the target support after a preset second reserved height is;
s4: generating a first connecting rod for connecting the current latest support and the target support according to the preset angle and the preset diameter from the current starting point; the current starting point is a higher point in the vertexes of the current latest support and the target support, or a position point mapped on the support with the higher vertex after a preset first reserved height is subtracted from a lower point in the vertexes of the current latest support and the target support;
s5: and generating a second connecting rod and more than the second connecting rod which are used for connecting the current latest support and the target support according to the preset angle and the preset diameter by taking the terminal point of the previous connecting rod as a starting point until the number of the connecting rods reaches the prepared adding number.
2. The method of automatically adding a connecting stick as claimed in claim 1, further comprising step S0 before the step S1: acquiring a support distance range set by a user as the preset distance range; acquiring an included angle between a connecting rod and a support, which is set by a user, as the preset angle; acquiring a first reserved height and a second reserved height set by a user as the preset first reserved height and second reserved height; and acquiring the diameter of the connecting rod set by the user as the preset diameter.
3. The method for automatically adding a connecting stick as claimed in claim 1, wherein the connecting stick height in the step S2 is a projected height of the connecting stick in a vertical direction, and the product of a distance between the current latest support and the target support and a tangent trigonometric function value of the preset angle is taken as the connecting stick height.
4. The method for automatically adding a connecting stick as claimed in claim 1, 2 or 3, wherein in step S3, the total height is divided by the height of the connecting stick to obtain a quotient as the preliminary addition amount.
5. The device for automatically adding the connecting rod is characterized by comprising a support generation module, a connecting rod calculation module and a connecting rod generation module;
the support generation module is used for generating a support on the 3D model;
the connecting rod calculation module is used for traversing the current support generated by the support generation module and taking the support with the distance from the current latest support within a preset distance range as a target support; calculating to obtain the height of the connecting rod according to a preset angle and the distance between the current latest support and the target support; and calculating to obtain the number of prepared additions according to the height and the total height of the connecting rods; the total height is the height difference between a higher point in the top points of the current latest support and the target support and a lower point in the bottom points of the current latest support and the target support, or the height difference between the lower point in the top points of the current latest support and the target support and the lower point in the bottom points of the current latest support and the target support after a preset first reserved height is subtracted from the lower point, or the height difference between the lower point in the top points of the current latest support and the lower point in the bottom points of the current latest support and the target support after a preset second reserved height is;
the connecting rod generating module is used for generating a first connecting rod for connecting the current latest support and the target support from the current starting point according to the preset angle and the preset diameter; generating a second connecting rod or more between the current latest support and the target support according to the preset angle and the preset diameter by taking the terminal point of the previous connecting rod as a starting point until the number of the connecting rods reaches the prepared adding number; and the current starting point is a higher point in the vertexes of the current latest support and the target support, or is a position point mapped on the support with the higher vertex after a preset first reserved height is subtracted from the lower point in the vertexes of the current latest support and the target support.
6. The apparatus for automatically adding a connecting rod according to claim 5, further comprising a connecting rod parameter setting module for acquiring a support pitch range set by a user as the preset pitch range; acquiring an included angle between a connecting rod and a support, which is set by a user, as the preset angle; acquiring a first reserved height and a second reserved height set by a user as the preset first reserved height and second reserved height; and acquiring the diameter of the connecting rod set by the user as the preset diameter.
7. The apparatus for automatically adding a connecting rod according to claim 5, wherein the connecting rod height is a projected height of the connecting rod in a vertical direction, and a product of a distance from the current latest support to the target support and a tangent trigonometric function value of the preset angle is taken as the connecting rod height.
8. Device for the automatic addition of connecting rods according to claim 5 or 6 or 7, characterized in that said number of preliminary additions is the quotient of said total height divided by said connecting rod height.
9. A 3D printing design system comprising a model file import module for importing a 3D model file and a slice file generation module, characterized by further comprising the apparatus for automatically adding a connecting rod of any one of claims 5 to 8; and the slicing file generation module is used for generating the corresponding slicing file suitable for 3D printing from the three-dimensional stereo graph formed by the 3D model and the support and the connecting rod generated by the automatic connecting rod adding device according to an instruction for generating the slicing file.
10. A photocuring 3D printing system comprising a photocuring 3D printer, further comprising the 3D printing design system of claim 9; and the photocuring 3D printer receives the slice file generated by the 3D printing design system and prints the support, the connecting rod and the 3D model.
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| CN111451503B (en) * | 2020-04-10 | 2022-08-12 | 哈尔滨福沃德多维智能装备有限公司 | SLM additive manufacturing fine part printing support adding method and removing method |
| CN112873835A (en) * | 2021-01-29 | 2021-06-01 | 优你造科技(北京)有限公司 | 3D printing support body reinforcing method and device |
| CN114083800B (en) * | 2021-10-27 | 2022-07-05 | 深圳市诺瓦机器人技术有限公司 | 3D printing data generation method and device of model supporting surface and storage medium |
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