CN108501380B - Process model construction method suitable for additive manufacturing - Google Patents
Process model construction method suitable for additive manufacturing Download PDFInfo
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- CN108501380B CN108501380B CN201810145835.4A CN201810145835A CN108501380B CN 108501380 B CN108501380 B CN 108501380B CN 201810145835 A CN201810145835 A CN 201810145835A CN 108501380 B CN108501380 B CN 108501380B
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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
- B33Y50/00—Data acquisition or data processing for additive manufacturing
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Abstract
The invention discloses an initial geometric model of a process model construction method suitable for additive manufacturing, which specifically comprises the following processes: step 1, setting quality requirement parameters for designing a three-dimensional model, wherein the quality requirement parameters specifically comprise: surface roughness RaFlatness c, roundness e; step 2, mapping the quality requirement parameters set in the step 1 into color information through a specific mapping relation; and 3, filling the color information obtained in the step 2 on the three-dimensional model to obtain a process model. The method provided by the invention can enhance the relevance between the existing process model and the design model and between the process geometric information and the non-geometric information, and improve the stability of the molding quality.
Description
Technical Field
The invention belongs to the technical field of additive manufacturing, and relates to a process model construction method suitable for additive manufacturing.
Background
The fused deposition modeling technology is to heat and melt thread-shaped hot melt materials, simultaneously, a three-dimensional spray head selectively coats the materials on a workbench under the control of a computer according to the profile information of the cross section, and the materials form a layer of cross section after being rapidly cooled. After one layer is formed, the machine table is lowered by one height (namely, the layering thickness) and then the next layer is formed until the whole solid modeling is formed.
Compared with the traditional manufacturing and forming technology, the fused deposition technology is driven by three-dimensional data, the design of a three-dimensional model becomes an indispensable link in the additive manufacturing technology, but at present, additive manufacturing can only be carried out according to geometric information of the three-dimensional model, the problems that forming quality precision is difficult to control, products cannot meet requirements of customers according to related designs and the like easily occur, meanwhile, the association between a process model and a design model, between process geometric information and non-geometric information, between an assembly process and a part process and between the process model and process resources is weak, most of data are relatively independent and dispersed, cannot be identified by the existing 3D printing system, a large number of data islands exist, and the manufacturing information required in the process is difficult to be effectively transmitted, so that the wide application of the additive manufacturing technology is limited.
In order to ensure the stability of the molding quality, the quality requirement information of the design model, including roughness Ra, flatness C and roundness e, is mapped to the traditional geometric model and expanded into a process model which can be directly identified by equipment, so that the effectiveness of independent and dispersed data transmission is improved, the molding quality is ensured, and the molding stability is improved.
Disclosure of Invention
The invention aims to provide a process model construction method suitable for additive manufacturing, which can enhance the relevance between the existing process model and the design model and between the process geometric information and the non-geometric information and improve the stability of the molding quality.
The technical scheme adopted by the invention is that the process model construction method suitable for additive manufacturing specifically comprises the following processes:
and 3, filling the color information obtained in the step 2 on the three-dimensional model to obtain a process model.
The present invention is also characterized in that,
wherein the range of the quality requirement parameters in the step 1 is as follows: c is less than or equal to 5mm, e is less than or equal to 600, Ra≤150。
The specific process of the step 2 is as follows:
step 2.1, mapping the set quality requirement parameter, namely the planeness c, of the designed three-dimensional model into the color filling chromaticity R through the following formula (1):
step 2.2, mapping the set quality requirement parameter roundness e of the designed three-dimensional model into color filling chromaticity G by the following formula (2):
step 2.3, the set quality requirement parameter of the design three-dimensional model, namely the surface roughness RaMapping the color filling chromaticity B into a color filling chromaticity B, wherein the specific mapping relation is as follows:
when setting the surface roughness parameter RaAnd when the color filling chroma is less than or equal to 50, obtaining the color filling chroma B through a formula (3):
wherein m represents a surface roughness grade;
when the surface roughness parameter is set to be not less than 50RaWhen the color filling chroma is less than or equal to 150, obtaining the color filling chroma B through a formula (4):
wherein, the order of filling the color information obtained in the step 2 in the step 3 is as follows: chroma R, chroma G, chroma B.
The invention has the following beneficial effects:
1. according to the invention, the quality requirement information is mapped to the original design geometric model, the geometric model is reconstructed, and the process model suitable for incremental manufacturing is obtained, so that the problems of weak correlation between the existing process model and the design model, between the process geometric information and the non-geometric information, between the assembly process and the part process, and between the process model and the process resources are solved, the equipment can directly perform data identification, and the existence of data islands is reduced.
2. Compared with the traditional geometric model, the process model obtained by the design process model construction method provided by the invention is easier to identify and accept by equipment, is easier to perform process selection optimization, and improves the stability of the molding quality while ensuring the molding quality.
Drawings
Fig. 1 is an initial geometric model of a process model construction method suitable for additive manufacturing according to the present invention.
In the figure, 1 is a quality requirement surface a, 2 is a quality requirement surface b.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The technical scheme adopted by the invention is that the process model construction method suitable for additive manufacturing specifically comprises the following steps:
the quality requirement parameters are specifically as follows: surface roughness RaFlatness c, roundness e;
in step 1, c is less than or equal to 5mm, e is less than or equal to 600, Ra≤150；
the specific process of the step 2 is as follows:
step 2.2, mapping the set quality requirement parameter of the designed three-dimensional model, namely the planeness c (mm), into the color filling chromaticity R through a formula (1):
wherein c is a flatness value and is less than or equal to 5 mm.
Step 2.3, mapping the set quality requirement parameter-roundness e (mum) of the designed three-dimensional model into color filling chromaticity G through a formula (2):
wherein e is a roundness value and is less than or equal to 600.
Step 2.1, the set quality requirement parameter of the design three-dimensional model, namely the surface roughness RaMapping the color filling chromaticity B into a color filling chromaticity B, wherein the specific mapping relation is as follows:
when setting the surface roughness parameter RaWhen the surface roughness is less than or equal to 50, the surface roughness is reduced by the following table 1The corresponding grade m is selected from the contrast table,
TABLE 1
| Ra | 50 | 25 | 12.5 | 6.3 | 3.2 | 1.60 | 0.80 |
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Ra | 0.40 | 0.20 | 0.100 | 0.050 | 0.025 | 0.012 | - |
| m | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
The color fill chroma B is obtained by equation (3):
m roughness grade;
when the surface roughness parameter is set to be not less than 50RaWhen the color filling chroma is less than or equal to 150, obtaining the color filling chroma B through a formula (4):
and 3, marking the obtained color information on the three-dimensional model to obtain a process model:
wherein the color labeling sequence in the step 3 is as follows: chroma R, chroma G, chroma B.
Example 1
The method comprises the following steps of setting quality requirement parameters for a designed geometric model, making requirements on a surface a and a surface b, and having no quality requirements on the rest surfaces, specifically: referring to fig. 1, quality requirement plane a 1: flatness c13, roundness e1100, surface roughness Ra1＝3.2；
And (3) respectively calculating and determining chromaticity R and chromaticity G according to formulas (1) and (2):
from surface roughness RaLess than or equal to 50, taking m from table 11The chromaticity B is determined by calculation of formula (3) as 5:
quality requirement b 2: flatness c24.5, no roundness requirement, and e20, surface roughness Ra2＝12.5；
And (3) respectively calculating and determining chromaticity R and chromaticity G according to formulas (1) and (2):
from surface roughness RaLess than or equal to 50, taking m from table 12The chromaticity B is determined by calculation of formula (3):
color filling is carried out on the quality requirement surface a1 according to the chromaticity R153, the chromaticity G42.5 and the chromaticity B18.21; according to the chromaticity R153, the chromaticity G0, and the chromaticity B42.85, the quality requirement plane B2 is color-filled, and no filling sequence requirement exists between the quality requirement plane a1 and the quality requirement plane B2.
Claims (2)
1. A process model construction method suitable for additive manufacturing is characterized by comprising the following steps: the method specifically comprises the following steps:
step 1, setting quality requirement parameters for designing a three-dimensional model, wherein the quality requirement parameters specifically comprise: surface roughness RaFlatness c, roundness e;
step 2, mapping the quality requirement parameters set in the step 1 into color information through a specific mapping relation;
step 3, filling the color information obtained in the step 2 on the three-dimensional model to obtain a process model;
the range of the quality requirement parameters in the step 1 is as follows: c is less than or equal to 5mm, e is less than or equal to 600, Ra≤150；
The specific process of step 2 is as follows:
step 2.1, mapping the set quality requirement parameter, namely the planeness c, of the designed three-dimensional model into the color filling chromaticity R through the following formula (1):
step 2.2, mapping the set quality requirement parameter roundness e of the designed three-dimensional model into color filling chromaticity G by the following formula (2):
step 2.3, the set quality requirement parameter of the design three-dimensional model, namely the surface roughness RaMapping the color filling chromaticity B into a color filling chromaticity B, wherein the specific mapping relation is as follows:
when setting the surface roughness parameter RaAnd when the color filling chroma is less than or equal to 50, obtaining the color filling chroma B through a formula (3):
wherein m represents a surface roughness grade;
when the surface roughness parameter is set to be not less than 50RaWhen the color filling chroma is less than or equal to 150, obtaining the color filling chroma B through a formula (4):
2. a process model building method suitable for additive manufacturing according to claim 1, characterized by: the filling sequence of the color information obtained in the step 2 on the three-dimensional model in the step 3 is as follows: chroma R, chroma G, chroma B.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002035397A2 (en) * | 2000-10-27 | 2002-05-02 | Coe Dorsey D | Three-dimensional model colorization during model construction from computer aided design data |
| CN105904899A (en) * | 2016-05-23 | 2016-08-31 | 广东工业大学 | Hole decoration plate machining method based on RGB and machining system applying same |
| CN106426938A (en) * | 2016-08-24 | 2017-02-22 | 芜湖枫曲三维数字化设计有限公司 | Colored model three-dimensional printing method |
| CN107209952A (en) * | 2015-01-30 | 2017-09-26 | 惠普发展公司有限责任合伙企业 | Generate the preview of 3D objects |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002035397A2 (en) * | 2000-10-27 | 2002-05-02 | Coe Dorsey D | Three-dimensional model colorization during model construction from computer aided design data |
| CN107209952A (en) * | 2015-01-30 | 2017-09-26 | 惠普发展公司有限责任合伙企业 | Generate the preview of 3D objects |
| CN105904899A (en) * | 2016-05-23 | 2016-08-31 | 广东工业大学 | Hole decoration plate machining method based on RGB and machining system applying same |
| CN106426938A (en) * | 2016-08-24 | 2017-02-22 | 芜湖枫曲三维数字化设计有限公司 | Colored model three-dimensional printing method |
Non-Patent Citations (1)
| Title |
|---|
| 机加工艺三维可视化表示与生成技术研究;张中伟 等;《制造业自动化》;20130225;第35卷;第26页右栏第8行-第29页右栏最后一行 * |
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