CN107506507A - A kind of limited first analogy method of injection molding based on Moldflow symmetrical structures - Google Patents
A kind of limited first analogy method of injection molding based on Moldflow symmetrical structures Download PDFInfo
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- CN107506507A CN107506507A CN201610425706.1A CN201610425706A CN107506507A CN 107506507 A CN107506507 A CN 107506507A CN 201610425706 A CN201610425706 A CN 201610425706A CN 107506507 A CN107506507 A CN 107506507A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The invention provides a kind of limited first analogy method of injection molding based on Moldflow symmetrical structures, by the injection-moulded plastic part digital-to-analogue of symmetrical structure, axis punishment is broken into two symmetrical parts therefrom, only retain one of part, the plane of symmetry is formed at the disjunction of the part；The digital-to-analogue of the part is imported in Moldflow, and FEM meshing is carried out to it；The grid on the plane of symmetry is deleted after mesh quality optimization；It is mirror image face, using the node on the plane of symmetry as reference point using the plane of symmetry, then all copy generates the grid of second half symmetrical part；Free mid-side node at two planes of symmetry is merged, obtains the grid of whole symmetrical structure；To submitting analysis after the grid setup parameter of whole symmetrical structure.The present invention not only saves the result symmetry that the working time also keeps symmetrical structure, improves the degree of accuracy of analysis result by carrying out FEM meshing to a half structure of symmetrical structure injection-moulded plastic part.
Description
Technical field
The invention belongs to the Finite Element Method field of high polymer material injection molding, and in particular to one kind is based on
The limited first analogy method of injection molding of Moldflow symmetrical structure.
Background technology
Using the Moldflow of autodesk, inc. as representative, it has the Finite Element Method of high polymer material injection molding
The occupation rate of market of very big share, engineering staff can be effectively assisted to be verified and optimized structure of plastic accessory design, injection
Mold design and injection molding process, so as to predict the problem of there may be in some actual productions in advance and solve ahead of time,
It is final to improve actual production efficiency, save production cost.
High polymer material injection structure species is various, and the design of wherein symmetrical structure occupies certain proportion.Existing use
Moldflow is directly to have the digital-to-analogue of injection-moulded plastic part to the Finite Element Method of high polymer material injection molding
First mesh generation is limited, then repairs grid, then carries out the setting such as material, cast gate, cooling system, symmetrical structure design
It is such.
But some shortcomings are still suffered from actual applications：1. the digital-to-analogue designed whole symmetrical structure once all carries out limited
First mesh generation pretreatment stage needs to consume longer time, inefficient；2. the digital-to-analogue that whole symmetrical structure is designed
Grid division is once all submitted, because the discreteness of grid division is so as to the trellis state at symmetrical structure and asymmetry；
3. manually carry out causing the asymmetry of grid optimization quality state in the later stage in mesh quality optimization process；4. symmetrical structure
The final asymmetry of trellis state causes the asymmetry of final analysis result at design, it is difficult to accurate and effective judgement
As a result, problem is brought so as to produce the solution of problem to engineering.
The content of the invention
To solve above technological deficiency, it is an object of the present invention to provide a kind of injection of the symmetrical structure based on Moldflow
It is molded Finite Element Method.The technical advantage of the invention can save half in FEM meshing pretreatment stage
Time, efficiency is improved, while cause the part of symmetrical structure design to keep symmetrical junction in the limited member simulation of injection molding
The result symmetry of structure, improves the degree of accuracy of analysis result.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of limited first analogy method of injection molding based on Moldflow symmetrical structures, step are as follows：
(1) by the injection-moulded plastic part digital-to-analogue of symmetrical structure, axis punishment is broken into two symmetrical parts therefrom, only retains it
In a part, at the disjunction of the part formed the plane of symmetry；
(2) digital-to-analogue of the part is imported in Moldflow, and FEM meshing is carried out to it；
(3) mesh quality optimization is carried out to ready-portioned finite element grid；
(4) grid on the plane of symmetry is deleted；
(5) it is mirror image face, using the node on the plane of symmetry as reference point using the plane of symmetry, then all copy generation is symmetrical
The grid of second half part；
(6) the free mid-side node at two planes of symmetry is merged, obtains the grid of whole symmetrical structure；
(7) material trademark, gate location and type, cooling system, analysis times are set to the grid of whole symmetrical structure
Service type, then submit analysis.
Further scheme, mesh quality optimization is carried out to ready-portioned finite element grid in the step (3), reaches it
To the quality standard of Moldflow analyses.
Further scheme, thickness, the grid point symmetrically located in whole symmetrical structure grid after the middle merging of the step (6)
Cloth should be consistent with mesh quality.
Compared with prior art, the present invention has advantages below：
1. saving engineering staff's most of the time in FEM meshing pretreatment stage, work effect is greatly improved
Rate.
2. cause the part that symmetrical structure designs the grid distribution of symmetric position, grid matter in the limited member simulation of injection molding
Amount maintains the uniformity of symmetrical structure.
3. analysis result preferably ensure that the symmetry of symmetrical structure, the degree of accuracy of analysis result is improved, it is accurate compared with energy
Transmission engineering information so as to providing guiding opinion to engineering producers.
Brief description of the drawings
Fig. 1 is symmetrical structure injection-moulded plastic part model；
Fig. 2 is the half model that symmetrical structure of the present invention separates rear reservation symmetrical structure from the plane of symmetry punishment of axis；
Fig. 3 is the finite element grid of whole symmetrical structure in embodiment；
Fig. 4 is the finite element grid of whole symmetrical structure in comparative example；
Fig. 5 is web thickness detection and symmetric position sign in embodiment；
Shear rate interpretation of result when Fig. 6 is the injection filling of symmetric position in embodiment；
Fig. 7 is web thickness detection and symmetric position sign in comparative example；
Shear rate interpretation of result when Fig. 8 is the injection filling of symmetric position in comparative example.
Embodiment
The present invention is further described below in conjunction with specific embodiment.
(1) will show such as Fig. 1, by overall wall thickness 2.5mm five-pointed star boss (height 2mm) and regular hexagon boss
Axis L punishment is broken into J, L portion to the symmetrical structure digital-to-analogue of (height 2mm) therefrom, only retains J portion (such as Fig. 2
It is shown), the gap in J portions forms the plane of symmetry；
(2) digital-to-analogue in J portions is imported into Moldflow, sets the global length of side as 3, FEM meshing is carried out to it；
(3) mesh quality optimization is carried out to ready-portioned finite element grid, its aspect ratio is less than 6, without free margins,
Mesh fitting rate is 99%, reaches the quality criteria requirements of Moldflow software analysis；
(4) grid on the plane of symmetry in the A portions optimized is deleted；
(5) by the image feature in Moldflow, using the plane of symmetry as mirror image face, using the node on the plane of symmetry as reference
Point all copies symmetrical second half part K ' of generation grid；
(6) the free mid-side node on the plane of symmetry is merged by the node pooling function in Moldflow, obtained whole
The grid of individual symmetrical structure, as shown in Figure 3；
(7) grid of its whole symmetrical structure is checked：Such as five-pointed star boss structure and regular hexagon boss structure
Symmetrical place's consistency of thickness, symmetrical to locate grid distribution consistent, and symmetrical to locate mesh quality consistent；
(8) trades mark of Isoglass H 30, the material of the symmetrical structure setting Sirmax companies handled well to grid
The glass of polypropylene+30% is defined as, gate location is located at the center of width edge, and gate type is rectangle side gate, point
The combined tasks such as type selecting filling, pressurize, warpage are analysed, submit analysis.
Comparative example
(1) such as Fig. 1 is shown that overall wall thickness 2.5mm five-pointed star boss (height 2mm) and regular hexagon boss are (high
Degree 2mm) symmetrical structure digital-to-analogue be introduced directly into Moldflow, set the global length of side as 3, finite element grid carried out to it
Division；
(2) mesh quality optimization is carried out to ready-portioned finite element grid, its aspect ratio is less than 6, without free margins,
Mesh fitting rate is 99%, reaches the quality criteria requirements of Moldflow software analysis；
(3) grid to its whole symmetrical structure is checked (such as Fig. 4)：Five-pointed star boss structure and regular hexagon are convex
Symmetrical place's thickness of platform structure exists indivedual inconsistent, and symmetrical to locate grid distribution and has differences, symmetrical mesh quality of locating is present
Difference；
(4) trades mark of Isoglass H 30, the material of the symmetrical structure setting Sirmax companies handled well to grid
The glass of polypropylene+30% is defined as, gate location is located at the center of width edge, and gate type is rectangle side gate, point
The combined tasks such as type selecting filling, pressurize, warpage are analysed, submit analysis.
Above-described embodiment is analyzed as follows with the Finite Element Method that comparative example is taken respectively：
(1) time each required for grid division is as shown in table 1, and method of the invention is before FEM meshing
Processing stage saves for 2/3rds time, greatly increases operating efficiency.
Time contrast required for the grid division of table 1
| Embodiment | Comparative example | |
| The grid division time | 69 seconds | 241 seconds |
(2) finite element grid thickness distribution is detected as shown in table 2, it can be seen that the application is formed whole symmetrical
The grid of structure accurately maintains former design 4.5mm target, and comparative example thickness occurs and designs larger difference with original
Error, the method for this explanation present invention can preferably ensure former design idea, and result that analog simulation goes out can be accurate
React practical production status.And the grid distribution symmetrically located, quality maintain the uniformity (such as Fig. 5) of symmetrical structure,
These all ensure that the accuracy of result of calculation.And the grid distribution of symmetric position not holding pair well in comparative example
The uniformity (such as Tu7Zhong X areas, Y areas) of title.
The web thickness of table 2 contrasts
| Embodiment | Comparative example | |
| A points | 4.5mm | 3.25mm |
| B points | 4.5mm | 3.75mm |
| C points | 4.5mm | 4.67mm |
(3) when injection filling is carried out to symmetric position point A and A ', point B and B ', point C and C ' in symmetrical structure
Shear rate analysis：As shown in fig. 6, symmetric position (A-A ', B-B ', C-C ') in the embodiment of the present invention
Shear rate during injection filling is all consistent, and this is with reality and is consistent：Symmetrical configuration design, cast gate and runner
Symmetrically, then the molding proces s parameters of symmetric position should be consistent in structure.And symmetric position in comparative example (A-A ',
B-B ', C-C ') injection filling when shear rate there is larger difference, such as Fig. 8, this with not being consistent really,
Such analysis result can be brought greatly misleading to actual production guidance.
(4) to the contraction of symmetric position in symmetrical structure (point A-A ', point B-B ', point C-C ') distance center axle
Deformation analysis：Analysis result shows symmetric position (A-A ', B-B ', C-C ') distance center axle in embodiment
Contraction distortion is all consistent (such as table 3), although and in comparative example be all symmetric position, contraction distortion result is to have
Difference (such as table 3), such analysis result can be brought greatly uncertain and fascinating to engineering staff.
The contraction distortion contrast of the distance center axle of table 3
Contrast by above example with comparative example, the analogy method that embodiment uses can not only effectively improve analysis work
Efficiency, and analysis result preferably ensure that the symmetrical analysis result of symmetrical structure, believe compared with that can accurately transmit engineering
Breath to engineering producers so that provide guiding opinion.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using the present invention.
Person skilled in the art obviously can easily make various modifications to these embodiments, and described herein one
As principle be applied in other embodiment without by performing creative labour.Therefore, the invention is not restricted to implementation here
Example, those skilled in the art do not depart from improvement that scope made and modification all should according to the announcement of the present invention
Within protection scope of the present invention.
Claims (3)
- A kind of 1. limited first analogy method of injection molding based on Moldflow symmetrical structures, it is characterised in that：Step is as follows：（1）By the injection-moulded plastic part digital-to-analogue of symmetrical structure, axis punishment is broken into two symmetrical parts therefrom, only retains one of part, the plane of symmetry is formed at the disjunction of the part；（2）The digital-to-analogue of the part is imported in Moldflow, and FEM meshing is carried out to it；（3）Mesh quality optimization is carried out to ready-portioned finite element grid；（4）Grid on the plane of symmetry is deleted；（5）It is mirror image face, using the node on the plane of symmetry as reference point using the plane of symmetry, then all copy generates the grid of second half symmetrical part；（6）Free mid-side node at two planes of symmetry is merged, obtains the grid of whole symmetrical structure；（7）Grid setting material trademark, gate location and type, cooling system, analysis task type to whole symmetrical structure, then submit analysis.
- A kind of 2. limited first analogy method of injection molding based on Moldflow symmetrical structures according to claim 1, it is characterised in that：The step（3）In to ready-portioned finite element grid carry out mesh quality optimization, reach Moldflow analysis quality standard.
- A kind of 3. limited first analogy method of injection molding based on Moldflow symmetrical structures according to claim 1, it is characterised in that：The step（6）Thickness, the grid symmetrically located in whole symmetrical structure grid after middle merging are distributed should be consistent with mesh quality.
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| CN201610425706.1A CN107506507A (en) | 2016-06-14 | 2016-06-14 | A kind of limited first analogy method of injection molding based on Moldflow symmetrical structures |
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| CN201610425706.1A CN107506507A (en) | 2016-06-14 | 2016-06-14 | A kind of limited first analogy method of injection molding based on Moldflow symmetrical structures |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108549764A (en) * | 2018-04-11 | 2018-09-18 | 航天科技控股集团股份有限公司 | A kind of Automobile instrument structure optimization method based on Moldflow analyses |
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| CN101110126A (en) * | 2007-06-19 | 2008-01-23 | 北京大学 | Method for re-establishing three-dimensional model gridding |
| US7633160B1 (en) * | 2008-11-12 | 2009-12-15 | Powertech Technology Inc. | Window-type semiconductor package to avoid peeling at moldflow entrance |
| CN105631117A (en) * | 2015-12-28 | 2016-06-01 | 株洲时代新材料科技股份有限公司 | Spline coupling anti-side-rolling torsion bar grid division method |
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2016
- 2016-06-14 CN CN201610425706.1A patent/CN107506507A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101110126A (en) * | 2007-06-19 | 2008-01-23 | 北京大学 | Method for re-establishing three-dimensional model gridding |
| US7633160B1 (en) * | 2008-11-12 | 2009-12-15 | Powertech Technology Inc. | Window-type semiconductor package to avoid peeling at moldflow entrance |
| CN105631117A (en) * | 2015-12-28 | 2016-06-01 | 株洲时代新材料科技股份有限公司 | Spline coupling anti-side-rolling torsion bar grid division method |
Non-Patent Citations (2)
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| 任中全等: "《现代机械设计理论与方法》", 29 February 2000 * |
| 曲海霞: "基于PR0E的一模多腔注塑模具结构设计及Moldflow仿真分析", 《中国优秀硕士学位论文全文数据库信息科技Ⅰ辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108549764A (en) * | 2018-04-11 | 2018-09-18 | 航天科技控股集团股份有限公司 | A kind of Automobile instrument structure optimization method based on Moldflow analyses |
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Application publication date: 20171222 |