阅读说明：本技术 一种3d打印件支撑件以及其添加方法和打印方法 (3D printing piece supporting piece and adding method and printing method thereof ) 是由 朱光 范文 时海勇 于 2020-04-29 设计创作，主要内容包括：本发明披露了一种3D打印件的支撑件,所述支撑件的至少一端与所述打印件连接；所述支撑件,包括主体部以及与打印件连接的连接部,所述打印件表面开设有凹陷,所述支撑件的连接部与该凹陷中心连接。本发明所要解决的技术问题是,通过在打印件的三维模型表面开设凹陷,支撑件用于与打印件连接的的连接部设置在凹陷中,那么在3D打印过程中,支撑件与打印件连接处的多余固化能够将凹陷部分填充,在3D打印完成后,支撑件与打印件能够直接分离,且分离后打印件与支撑件的连接处一般不会有多余的残料或是破损的情况,能够省略对打印件的打磨后处理步骤,从而实现免打磨的3D打印方式。(The invention discloses a support of a 3D printing piece, wherein at least one end of the support is connected with the printing piece; the supporting piece comprises a main body part and a connecting part connected with a printed piece, a recess is formed in the surface of the printed piece, and the connecting part of the supporting piece is connected with the center of the recess. The invention aims to solve the technical problem that a recess is formed in the surface of a three-dimensional model of a printing piece, and a connecting part of a support piece, which is used for being connected with the printing piece, is arranged in the recess, so that the recess can be filled by redundant solidification at the connecting part of the support piece and the printing piece in the 3D printing process, the support piece and the printing piece can be directly separated after the 3D printing is finished, redundant residual materials or damage conditions are not generally generated at the connecting part of the separated printing piece and the support piece, the post-processing step of polishing the printing piece can be omitted, and the polishing-free 3D printing mode is realized.)

1. A support for a 3D print, wherein at least one end of the support is connected to the print; the supporting piece comprises a main body part and a connecting part connected with a printed piece, a recess is formed in the surface of the printed piece, and the connecting part of the supporting piece is connected with the center of the recess.

2. A support for a 3D print according to claim 1, wherein a recess in the surface of the print is connected to a connecting portion.

3. A support for a 3D print according to claim 1 wherein the centre of the depression is the deepest point of the depression.

4. A support for a 3D print according to claim 1 wherein the axial direction of the connecting portion of the support is perpendicular to the tangent plane of the base of the recess to which it is connected.

5. A support for a 3D print according to claim 1 wherein the depressions are symmetrical structures such as hemispheres, hemiellipsoids, cones, truncated cones and the like.

6. A support for a 3D print according to claim 1, wherein the edge of the recess that connects to the surface of the print is chamfered.

7. A support for a 3D print according to claim 6, characterized in that the chamfer angle is 45 °.

8. A support for a 3D print according to claim wherein the chamfer is a radiused chamfer.

9. A support for a 3D printed matter according to claim 8, characterized in that the recess is a hemisphere, the radius of the rounded chamfer being smaller than or equal to the radius of the hemisphere.

10. A support for a 3D print according to claim 1 wherein the cross-sectional area of the body portion and the connecting portion is greater than the cross-sectional area of the connecting portion and the print.

11. A support for a 3D print according to claim 1 wherein the volume and depth of the recess is variable by increasing the cross-sectional area of the connection between the support and the print.

12. A 3D printing support according to claim 1, wherein the support connecting portion is a circular truncated cone structure, and a bottom surface of the circular truncated cone structure with a smaller area is connected to the printing member, and a bottom surface with a larger area is connected to the support main body portion.

13. A method of adding a support for a 3D print, comprising:

the 3D printing piece support member is used for supporting the structure of a 3D printing piece and the connection mode of the support member and the printing piece;

firstly, acquiring a three-dimensional model of a printed piece;

then determining a connecting point for adding a supporting piece on the three-dimensional model, and forming a recess on the surface of the three-dimensional model by taking the connecting point as a center;

and finally constructing a support member, wherein the support member comprises a main body part and a connecting part connected with the printing member, and the connecting part of the support member is connected with the center of the surface depression of the three-dimensional model.

14. A3D printing method, comprising:

-processing the three-dimensional model of the print with the method of addition of a 3D print support according to any of the claims 13; preparing a 3D printing raw material;

and 3D printing is carried out on the processed three-dimensional model of the printed piece.

15. The 3D printing method according to claim 14, wherein the volume and depth of the recess are variable according to a rule that the larger the viscosity of the 3D printing material is, the larger the volume and depth of the recess are.

16. The 3D printing method according to claim 14, wherein after the 3D printing of the three-dimensional model of the print is completed, the support member is separated from the print, and the surface of the joint between the support member and the print is smoothed.

Technical Field

The invention relates to the technical field of 3D printing, in particular to a 3D printing support member for eliminating polishing of a printed piece in post-processing, and an adding method and a printing method thereof.

Background

The technical principle of 3D printing is that a three-dimensional model is layered firstly, then outline information or image information of each layer is obtained, and the printing of a printed piece is completed by using adhesive materials such as powdered metal or resin in a layer-by-layer printing mode.

Photocuring 3D printing is a type of 3D printing, photosensitive resin is cured layer by layer through light radiation curing and is superposed layer by layer, and in principle, an upper structure of a model is generally required to be supported by a lower part, so that if some parts of a printed piece are suspended, a support is generally required to be designed to support the suspended parts of the printed piece.

Since the slice of each layer has a certain thickness when the three-dimensional model is layered, and the slice layer related to the joint of the support and the printing member has an 'angle' formed by the support and the printing member in the contour information, since the thickness of each slice layer is very small (about 0.05-0.2mm) and the light radiation is refracted when being irradiated to the photosensitive resin, the photosensitive resin is subjected to 'excessive curing' in the corner contour of the joint of the support and the printing member in the 3D printing process, and as shown in fig. 1, the joint of the support 10 and the printing member 20 has a part with excessive curing 30 to form a bulge. Removal of the support member 10 after printing also requires grinding of the surface of the printed article 20 to remove the protrusions formed by the excess curing 30.

Disclosure of Invention

The invention aims to solve the technical problem that a recess is formed in the surface of a three-dimensional model of a printing piece, and a connecting part of a support piece, which is used for being connected with the printing piece, is arranged in the recess, so that the recess can be filled by redundant solidification at the connecting part of the support piece and the printing piece in the 3D printing process, the support piece and the printing piece can be directly separated after the 3D printing is finished, redundant residual materials or damage conditions are not generally generated at the connecting part of the separated printing piece and the support piece, the post-processing step of polishing the printing piece can be omitted, and the polishing-free 3D printing mode is realized.

The invention discloses a support of a 3D printing piece, wherein at least one end of the support is connected with the printing piece; the supporting piece comprises a main body part and a connecting part connected with a printed piece, a recess is formed in the surface of the printed piece, and the connecting part of the supporting piece is connected with the center of the recess.

Further, a recess in the surface of the print member is connected to a connecting portion.

Further, the center of the depression is the deepest point of the depression.

Further, the axial direction of the connecting part of the supporting part is perpendicular to the tangent plane of the bottom of the connected recess.

Furthermore, the depressions are symmetrical structures such as hemispheroids, semiellipsoids, cones and round tables.

Further, a chamfer is arranged on the edge of the recess connected with the surface of the printing piece.

Further, the chamfer angle is 45 °.

Further, the chamfer is a circular arc chamfer.

Furthermore, the recess is a hemisphere, and the radius of the arc chamfer is smaller than or equal to that of the hemisphere.

Further, the cross-sectional area of the body portion and the connecting portion is larger than the cross-sectional area of the connecting portion and the print material connecting portion.

Further, the volume and depth of the recess may vary according to the law that the larger the cross-sectional area of the connecting portion of the support member and the connecting portion of the print member, the larger the volume and depth of the recess.

Furthermore, the connecting part of the supporting part is of a circular truncated cone structure, the bottom surface with the smaller area of the circular truncated cone structure is connected with the printing part, and the bottom surface with the larger area is connected with the main body part of the supporting part.

In addition, before 3D printing, a construction method of the structure of the support and the printed material and the connection method of the support and the printed material on computer software, that is, an adding method of the support of the 3D printed material, specifically includes:

firstly, acquiring a three-dimensional model of a printed piece;

then determining a connecting point for adding a supporting piece on the three-dimensional model, and forming a recess on the surface of the three-dimensional model by taking the connecting point as a center;

and finally constructing a support member, wherein the support member comprises a main body part and a connecting part connected with the printing member, and the connecting part of the support member is connected with the center of the surface depression of the three-dimensional model.

And the 3D printing method of the three-dimensional model of the printed product specifically comprises the following steps:

preparing a 3D printing raw material;

and 3D printing is carried out on the processed three-dimensional model of the printed piece.

Further, the volume and depth of the depression may vary according to the law that the greater the viscosity of the printing material, the greater the volume and depth of the depression.

Further, after the 3D printing of the three-dimensional model of the printed matter is completed, the supporting piece is separated from the printed matter, and the surface of the joint of the supporting piece and the printed matter tends to be smooth.

Drawings

FIG. 1 is a schematic diagram of a prior art print and support structure of the background of the invention;

FIG. 2 is a schematic view of the structure of a print and support member according to the present invention;

FIG. 3 is a schematic view of a depressed surface of a print member according to the present invention;

fig. 4 is a schematic view of the connection of a print and a support in the present invention after three-dimensional modeling and 3D printing, respectively.

Wherein: 10. a support member; 11. a main body portion; 12. a connecting portion; 20. printing a piece; 21. recessing; 22, chamfering; 30. and (4) redundant solidification.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments.

It will be understood that when an element is referred to as being "on," "attached to," "connected to," combined with, "contacting" another element, etc., it can be directly on, attached to, connected to, combined with, and/or contacting the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on," "directly attached to," directly connected to, "directly engaged with" or "directly contacting" another element, there are no intervening elements present. One skilled in the art will also appreciate that a structure or member that is referred to as being disposed "adjacent" another member may have portions that overlie or underlie the adjacent member.

Spatially relative terms, such as "below," "lower," "above," "upper," and the like, may be used herein for ease of description to describe an element or component's relationship to another element or component as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Similarly, the terms "upward," "downward," "vertical," "horizontal," and the like are used herein for illustrative purposes only, unless explicitly indicated otherwise.

The embodiment of the application mainly relates to a 3D prints support piece, and this support piece can be applicable to the multiple scene of printing 3D printing. For example, the support member can be applied to the technologies of 3D printing such as photocuring molding, fused deposition rapid prototyping and three-dimensional powder bonding molding. In some embodiments, the support may be a support in a 3D printing design process, a support in a printing process, or a support after printing is completed. The application still relates to the printing that has adopted 3D to print support piece when printing, and this printing can be the fretwork printing article who uses in each aspect such as medical, industry, life and art. The application also relates to a 3D printing support piece construction method and a 3D printing method of the printed piece, and a person skilled in the art can construct the support piece of the printed piece by adopting the support piece construction method on the software such as Rhino, Solidworks, Catia or UG and the like, and can finish printing through various 3D printing devices. The support of the printed piece, the construction method of the support of the printed piece and the application scene of the 3D printing method are not limited.

The 3D printing support 10 disclosed by the invention comprises a main body part 11 and a connecting part 12 connected with a printing part 20, wherein a recess 21 is formed on the surface of the printing part 20, and the connecting part 12 of the support 10 is connected with the center of the recess 21, as shown in fig. 1-4. In the embodiment of the present application, the recess 21 formed on the surface of the print 20 is not the surface profile of the original print 20, but a new recess 21 is formed on the surface of the original print 20 in cooperation with the support 10, and the recess 21 will be filled with the excessive curing 30 occurring in the curing process after the 3D printing is completed. It should be noted that the connecting portion 12 of the supporting member 10 is connected to the printing member 20, that is, at least one end of the supporting member 10 is connected to the printing member 20, and may be that one end of the supporting member 10 is connected to a forming table (for supporting the printing member 20 during printing) in the 3D printing apparatus, and the other end thereof is connected to the printing member 20; it is also possible that both ends of the support member 10 are connected to the print member 20.

Regarding the structure of the recess 21 in the invention:

in some embodiments, a recess 21 in the surface of the print element 20 is connected to a connecting portion 12, i.e. each support member 10 is connected to its corresponding recess 21, as shown in fig. 2, the body portions 11 of adjacent support members 10 are connected to each other in a net shape, and the connecting portions 12 extend independently from each other in the net structure and are connected to the print element 20.

In some embodiments, the center of the recess 21 is the deepest point of the recess 21, i.e., the deepest point of the recess 21 to which the connecting portion 12 of the support member 10 extends is connected to the print member 20. In some embodiments, the axial direction of the connecting portion 12 of the support member 10 is perpendicular to the tangent plane of the bottom of the recess 21 to which it is connected. In some embodiments, the recess 21 is a symmetrical structure such as a hemisphere, a hemiellipsoid, a cone, a truncated cone, etc. Such a design is intended to fill the recesses 21 more uniformly when the excessive curing 30 occurs during the 3D printing process, so as to achieve the printing completion, and the surface of the print 20 is nearly smooth after the print 20 is separated from the support 10, thereby eliminating the need for a post-processing process of polishing the print 20.

In some embodiments, the depth of the recess 21 is 0.1-0.5mm, and if the recess 21 is disposed on the wider surface of the print member 20 (the width of the surface of the print member 20 is larger than the diameter of the recess), the recess 21 is a complete symmetrical structure such as a hemisphere, a hemiellipsoid, a cone, a circular truncated cone, etc., and the opening area of the recess on the surface of the print member 20 is 0.03-0.8mm²In the meantime.

In some embodiments, if the recess 21 is disposed on a narrower surface of the printed material 20 (the width of the surface of the printed material 20 is smaller than the diameter of the recess), the predetermined recess 21 is disposed on the three-dimensional model surface of the printed material 20, and the center of the recess 21 coincides with the center of the predetermined area, so that even if the recess 21 is not complete on the printed material 20, the recess 21 is ensured to have a symmetrical structure on the printed material 20 as much as possible, which is beneficial for filling the recess 21 more uniformly when the excessive curing 30 occurs during the 3D printing process.

Since the conventional edge design may result in an angular edge at the transition between the recess 21 and the surface of the print element 20 (i.e. the edge of the recess 21), which may result in an additional protrusion of the excess curing 30, and thus the separation of the support 10 may still be not smooth enough, in some embodiments, as shown in fig. 3, a chamfer 22 is formed at the edge of the recess 21, and the chamfer 22 is designed to optimize the edge by locally providing the excess curing 30 at the edge. It is preferable to provide the recess 21 with a rounded chamfer to make the transition between the edge of the recess 21 and the surface of the print element 20 more gradual. The design is such that the filling of the print depressions 21 by excess curing is smoother after the support 10 has been separated from the print 20.

The preferred embodiment of the structure of the recess 21 specifically includes:

as shown in fig. 3, the recess 21 is a hemisphere, an arc chamfer with a radian of 45 degrees is arranged on the edge of the recess 21, the recess 21 is a hemisphere, and the arc radius of the arc chamfer is equal to the radius of the hemisphere. (it should be noted here that the radius of the circular arc chamfer and the radius of the recess 21 can be adjusted according to the actual printing requirement, and the preferred scheme is that the radius of the circular arc chamfer is smaller than or equal to the radius of the hemisphere.) the volume and depth of the recess 21 can be changed, and the change rule is that the larger the cross-sectional area of the connecting part 12 of the support 10 and the connecting part of the print 20 is, the larger the volume and depth of the recess 21 are.

Regarding the structure of the support 10 of the present invention:

the structure of the support 10 will be adjusted to the variations in the structure of the printed product, according to the actual printing requirements. In some embodiments, the specific structural construction of the support 10 can be done automatically by software algorithms (e.g., Grasshopper), or can be designed and adjusted in conjunction with manual work. In some embodiments, the support member 10 may include any combination of one or more of a column support member, a sheet support member, a mesh support member, etc., and those skilled in the art can specifically set the support member as needed during the actual operation, which is not limited in this application. In some embodiments, when the support 10 comprises a sheet support, the sheet support may comprise one plane or a plurality of planes that are not parallel to each other, and may also comprise one or more curved surfaces. The thickness of the sheet-like support may be selected to be 0.1-10 mm.

In some embodiments, the cross-sectional area of the connecting portion 12 may be equal to the main body portion 11. In some embodiments, the cross-sectional area of the end of the connecting portion 12 connected to the print member 20 is smaller than the cross-sectional area of the body portion 11. Specifically, the connecting portion 12 is connected between the main body portion 11 and the print part 20, the main body portion 11 is used for supporting the print part 20, the main body portion 11 is not connected with the print part 20, and the connecting portion 12 connects the main body portion 11 with the print part 20 and ensures that the support member 10 is easily removed from the print part 20 after printing is finished through the change of the cross-sectional area. When the shape of the body portion 11 is different, a person skilled in the art can secure that the cross-sectional area of the end of the connecting portion 12 connected to the print material 20 is smaller than the cross-sectional area of the body portion 11 by various design forms. For example, when the support member 10 includes a columnar support member, the body portion 11 may include one or more support columns, and the connection portions 12 may include connection columns respectively connected between the one or more support columns and the print member 20. The cross-sectional area of the connecting column may be set to be smaller than that of the supporting column, or the connecting column may be in a pyramid shape, a cone shape, a truncated cone shape, or the like, and the end of the connecting column having the smaller cross-sectional area in the pyramid shape, the cone shape, the truncated cone shape, or the like is connected to the printing element 20, and the end having the larger cross-sectional area is connected to the supporting column. When the support member 10 comprises a net-like support member, the body portion 11 may include a plurality of support posts constituting a net, and the connection portion 12 may include connection posts connecting between the support posts and the print member 20. As shown in fig. 2, the main body 11 is a cylinder, and the plurality of cylinders are connected to each other and supported by each other, and specifically, the diameter of the cylinder may be set to be 0.1 to 50mm (e.g., 0.1mm, 0.5mm, 1mm, 5mm, 10mm, etc.). The cross-sectional area of the connecting column may be set to be smaller than that of the support, or the connecting column may be in a pyramid shape, a cone shape, a truncated cone shape, or the like, and the end of the connecting column having the smaller cross-sectional area in the pyramid shape, the cone shape, the truncated cone shape, or the like is connected to the print element 20, and the end having the larger cross-sectional area is connected to the support. When the support member 10 includes a sheet-shaped support, the body portion 11 may include a support sheet, the thickness of which may be selected to be 0.1-10mm, and the connection portion 12 may include a zigzag structure or a plurality of connection posts spaced apart from each other and connected between the support sheet and the print member 20. The end of the zigzag-shaped connecting portion 12 having a smaller cross-sectional area is connected to the print member 20, and the end having a larger cross-sectional area is connected to the supporting sheet. In some alternative embodiments, the connection portion 12 of the sheet support to the print element 20 may comprise a connection post in the shape of a pyramid, a cone, a truncated cone, etc., and the connection post in the shape of a pyramid, a cone, a truncated cone, etc. has a smaller cross-sectional area and is connected to the print element 20, and the end with a larger cross-sectional area is connected to the support sheet.

Regarding the relationship between the recess 21 and the structure of the support 10 in the present invention:

since, according to the actual printing requirements, the structure of the support 10 will be adjusted according to the change of the structure of the printed matter, and the structure of the recess 21 will also follow the change of the structure of the support 10 to some extent. In some embodiments, the specific structural construction of the support 10 can be done automatically by software algorithms (e.g., Grasshopper), or can be designed and adjusted in conjunction with manual work. Specifically, the volume and depth of the recess 21 can be adjusted according to the structural change of the support 10, and in order to ensure the uniformity of the excessive curing 30 in the 3D printing process, the adjustment rule is that the larger the contact area between the connecting portion 12 of the support 10 and the print 20 is, the larger the volume and depth of the recess 21 are.

Regarding the addition of the support 10 and the print 20 and the printing method of the present invention:

in the actual operation process, before 3D printing, the structures of the support 10 and the print 20 and the connection manner between the two are implemented by computer software (Rhino, Solidworks, Catia, or UG software), and specifically include:

first, a three-dimensional model of the print 20 is obtained;

then determining a connection point of the support part 10 added on the three-dimensional model, and forming a recess 21 on the surface of the three-dimensional model by taking the connection point as a center;

finally, a support member 10 is constructed, wherein the support member 10 comprises a body part 11 and a connecting part 12 connected with the printing member 20, and the connecting part 12 of the support member 10 is connected with the center of the surface recess 21 of the three-dimensional model.

It should be noted that the above-mentioned logical sequence of computer software algorithms is the preferred sequence for adding the support member 10 to the three-dimensional model of the print member 20, and it is within the scope of the present application to change the sequence.

The 3D printing method specifically comprises the following steps:

preparing a 3D printing raw material;

3D printing is carried out on the processed three-dimensional model of the printed piece 20;

after the 3D printing of the three-dimensional model of the printed material 20 is completed, the support member 10 is separated from the printed material 20, and the surface of the joint of the support member 10 and the printed material 20 tends to be smooth.

Due to the different formulations of 3D printing stock, which differ in their properties, the viscosity of the stock is a crucial factor in the printing process, which affects its refractive index as well as its flow rate. In some embodiments, the greater the viscosity of the printing material, the greater the volume and depth of the depression 21.

The beneficial effects that may be brought about by the construction method of the support 10 of the 3D print 20 disclosed in the present application include, but are not limited to: (1) after the constructed support 10 is separated from the printing piece 20, residual materials of the support 10 cannot be left on the outer surface of the printing piece 20, so that the appearance and the use function of the printing piece 20 are not influenced; (2) the built support 10 is easily separated from the print 20 after printing is completed; (3) after the constructed support member 10 is separated from the printing member 20, the surface of the printing member 20 tends to be smooth, and post-treatment such as polishing is not needed, so that the production efficiency is improved. It is to be noted that different embodiments may produce different advantages, and in different embodiments, any one or combination of the above advantages may be produced, or any other advantages may be obtained.

It should be noted here that the support 10 is used for supporting the printed product 20 during the 3D printing process, and needs to be removed after the printing process is completed, and the support 10 itself is not a part of the printed product 20. The support 10 should be as easy to remove as possible while satisfying the support function. According to the technical scheme disclosed by the invention, the recess 21 is formed in the three-dimensional model of the printing part 20 before 3D printing, the support part 10 is connected to the center of the recess 21, and the recess 21 is filled through the redundant solidification 30 in the 3D printing, so that the effect of no protrusion at the joint of the support part 10 and the printing part 20 after printing is finished is realized, the separation of the support part 10 and the printing part 20 is more beneficial, and the separation of the support part 10 and the printing part 20 is ensured to be free of residual materials to a certain extent. The solution disclosed by the invention is applicable to all configurations of prints 20 and supports 10.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.