CN112199871A - Method for obtaining curved glass two-dimensional cutting graph - Google Patents
Method for obtaining curved glass two-dimensional cutting graph Download PDFInfo
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- CN112199871A CN112199871A CN202010964488.5A CN202010964488A CN112199871A CN 112199871 A CN112199871 A CN 112199871A CN 202010964488 A CN202010964488 A CN 202010964488A CN 112199871 A CN112199871 A CN 112199871A
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- 239000011521 glass Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004088 simulation Methods 0.000 claims abstract description 7
- 230000009471 action Effects 0.000 claims abstract description 4
- 230000005484 gravity Effects 0.000 claims abstract description 4
- 238000010586 diagram Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 238000000137 annealing Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000012937 correction Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000005357 flat glass Substances 0.000 description 2
- 238000013003 hot bending Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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Classifications
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
Abstract
The invention belongs to the technical field of glass processing, and relates to a method for obtaining a curved glass two-dimensional cutting graph. The method comprises the following steps: drawing three-dimensional digital graphs of the special-shaped curved glass and the straight hexahedron in 3D drawing software, introducing finite element simulation software to model the special-shaped curved glass and the straight hexahedron, applying a temperature field to enable the straight hexahedron to deform under the action of the temperature field and gravity until the straight hexahedron is completely attached to a model of the special-shaped curved glass to be obtained, stopping simulation, measuring the size of the straight hexahedron model outside the edge of the special-shaped curved glass model to be obtained, deducting the measured size from the size of the straight hexahedron before deformation, and drawing a plane where the length and the width of the straight hexahedron are located by adopting 2D drawing. The method can directly obtain the accurate curved glass cutting graph without carrying out multiple test debugging and correction, and has the advantages of high efficiency, simple operation, low cost, short period and short time consumption.
Description
Technical Field
The invention belongs to the technical field of glass processing, relates to a method for obtaining a two-dimensional cutting graph of glass, and particularly relates to a method for obtaining a two-dimensional cutting graph of curved glass.
Background
The glass material has excellent physical properties such as good optical property, high strength, high hardness and stable use at high temperature, and is widely applied to civil and national defense military industry fields such as airplanes and automobile windshields, armor protection and the like. Due to the fact that curved glass can well reduce wind resistance and is attractive in appearance, the glass is often required to be formed into a specific curved shape when being used as a windshield, and flat glass is required to be heated at high temperature to enable the glass to reach a temperature above an annealing point and to be formed into specific curved special-shaped glass by means of a corresponding mold. Before forming, the special-shaped curved glass needs to be cut into plate glass to be formed according to the curved surface unfolding size. At present, most of curved glass is unfolded by drawing software to obtain an original cutting graph, glass cut according to the original cutting graph is adopted for carrying out a hot bending test, the cutting graph is modified according to the die attaching error of the glass and an inspection die, and the steps are repeated in a circulating mode until the hot bending forming glass is completely attached to the inspection die. Therefore, the cutting graph obtained by the method has larger error with the real cutting graph, and needs to be debugged repeatedly, the period is long, and the efficiency is low.
Disclosure of Invention
The purpose of the invention is: aiming at the defects of the prior art, the method for obtaining the curved glass two-dimensional cutting graph is provided.
In order to solve the technical problem, the technical scheme of the invention is as follows: a method for obtaining a curved glass two-dimensional cutting pattern comprises the following steps:
(1) drawing a three-dimensional digital-analog diagram of the curved glass to be solved in 3D drawing software;
(2) drawing a right hexahedron three-dimensional model diagram in 3D drawing software;
(3) importing the drawn three-dimensional model of the curved glass to be solved into finite element simulation software;
(4) importing the drawn straight hexahedron three-dimensional digital-analog diagram into finite element simulation software;
(5) modeling curved glass to be solved and a right hexahedron;
(6) applying a temperature field to the built model to start simulation so that the straight hexahedron model deforms under the action of the temperature field and gravity;
(7) stopping the simulation when the straight hexahedron model is deformed to be completely attached to the curved surface glass model to be solved;
(8) measuring the size of a straight hexahedral model after the external deformation of the curved surface glass model is required to be solved;
(9) and deducting and measuring the size from the size of the straight hexahedron before deformation, and drawing the plane where the length and the width are located by adopting 2D drawing software to obtain a cutting graph.
The three-dimensional numerical model of the curved glass in the step (1) is any thickness.
And (3) in the step (2), the height of the straight hexahedron is consistent with the thickness of the curved glass obtained by the strip.
And (3) the area of the plane where the length and the width of the straight hexahedron are located in the step (2) is larger than the area of the curved surface of the curved glass to be obtained.
And (5) setting the material property of the curved glass model to be obtained as a non-deformable rigid body.
And (5) the material property parameters of the straight hexahedron model are the same as those of the curved glass to be obtained.
And (5) the straight hexahedral model built in the step (5) is positioned above the concave surface of the curved surface glass model to be solved, and at least three points which are not collinear on the edge of the concave surface of the straight hexahedral model are in contact with the straight hexahedral model.
And (4) enabling the surface temperature of the straight hexahedron to be higher than the annealing point temperature of the glass with the calculated curved surface by the temperature field applied in the step (6).
The invention has the beneficial effects that: the method can directly obtain the accurate curved glass cutting graph without carrying out multiple test debugging and correction, and has the advantages of high efficiency, simple operation, low cost, short period and short time consumption.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiment of the present invention will be briefly explained. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of the steps of the method of the present invention;
FIG. 2 is a cut pattern of windshield glass obtained by the method.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Features of various aspects of embodiments of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. The following description of the embodiments is merely intended to better understand the present invention by illustrating examples thereof. The present invention is not limited to any particular arrangement or method provided below, but rather covers all product structures, any modifications, alterations, etc. of the method covered without departing from the spirit of the invention.
In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention. The procedure for obtaining a two-dimensional cutting pattern of glass using the method of the invention is described with reference to the following examples:
the glass used in this example had a Young's modulus of 71GPa, a Poisson's ratio of 0.22 and an annealing point of 628 ℃.
The method for obtaining the curved glass cutting graph comprises the following steps:
(1) drawing a three-dimensional digital-analog diagram of the windshield glass in UG drawing software;
(2) drawing a right hexahedron with the size of 1300mm multiplied by 1100mm multiplied by 1.8mm in UG drawing software;
(3) importing the drawn three-dimensional model diagram of the windshield into ABAQUS software;
(4) importing the drawn straight hexahedron three-dimensional digital-analog diagram into ABAQUS software;
(5) modeling the windshield glass and the right hexahedron, setting the material property of the windshield glass model as a rigid body, and setting the material property of the right hexahedron model as the same property as the windshield glass;
(6) the temperature field was applied to the built model to a simulated temperature of 668 ℃. Starting simulation to enable the hexahedron model to deform under the action of a temperature field and gravity;
(7) stopping the simulation when the hexahedron model deforms to be completely attached to the windshield glass model;
(8) measuring the size of a hexahedral model outside the edge of the windshield glass model;
(9) the dimensions are deducted from the rectangular parallelepiped before deformation, and the obtained original sheet cutting pattern of the windshield glass is shown in figure 1, and the black line is a cutting line.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (8)
1. A method for obtaining a curved glass two-dimensional cutting pattern is characterized by comprising the following steps: the method comprises the following steps:
(1) drawing a three-dimensional digital-analog diagram of the special-shaped curved glass to be solved in 3D drawing software;
(2) drawing a right hexahedron three-dimensional digital-analog diagram in 3D drawing software;
(3) importing the drawn three-dimensional digital-analog graph of the glass with the curved surface to be subjected to the special shape into finite element simulation software;
(4) importing the drawn straight hexahedron three-dimensional digital-analog diagram into finite element simulation software;
(5) modeling the special-shaped curved glass to be solved and a right hexahedron;
(6) applying a temperature field to the built model to start simulation so that the straight hexahedron model deforms under the action of the temperature field and gravity;
(7) stopping the simulation when the straight hexahedron model is deformed to be completely attached to the curved surface glass model to be solved;
(8) measuring the size of a straight hexahedral model outside the edge of the special-shaped curved surface glass model to be obtained;
(9) and deducting and measuring the size from the size of the straight hexahedron before deformation, and drawing the plane where the length and the width are located by adopting 2D drawing software to obtain a two-dimensional cutting graph.
2. The method for obtaining the two-dimensional cutting pattern of the curved glass as claimed in claim 1, wherein: the three-dimensional numerical model of the curved glass in the step (1) is any thickness.
3. The method for obtaining the two-dimensional cutting pattern of the curved glass as claimed in claim 1, wherein: and (3) in the step (2), the height of the straight hexahedron is consistent with the thickness of the special-shaped curved glass to be obtained.
4. The method for obtaining the two-dimensional cutting pattern of the curved glass as claimed in claim 1, wherein: and (3) the area of the plane where the length and the width of the straight hexahedron are located in the step (2) is larger than the area of the curved surface of the special-shaped curved glass to be obtained.
5. The method for obtaining the two-dimensional cutting pattern of the curved glass as claimed in claim 1, wherein: and (5) setting the material property of the curved glass model to be obtained as a non-deformable rigid body.
6. The method for obtaining the two-dimensional cutting pattern of the curved glass as claimed in claim 1, wherein: and (5) the material property parameters of the straight hexahedron model are the same as those of the special-shaped curved glass to be obtained.
7. The method for obtaining the two-dimensional cutting pattern of the curved glass as claimed in claim 1, wherein: and (5) the straight hexahedral model built in the step (5) is positioned above the concave surface of the curved surface glass model to be solved, and at least three points which are not collinear on the edge of the concave surface of the straight hexahedral model are in contact with the straight hexahedral model.
8. The method for obtaining the two-dimensional cutting pattern of the curved glass as claimed in claim 1, wherein: the temperature field applied in the step (6) enables the surface temperature of the hexahedron to be 30-50 ℃ higher than the annealing point of the glass with the special-shaped curved surface to be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010964488.5A CN112199871A (en) | 2020-09-14 | 2020-09-14 | Method for obtaining curved glass two-dimensional cutting graph |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010964488.5A CN112199871A (en) | 2020-09-14 | 2020-09-14 | Method for obtaining curved glass two-dimensional cutting graph |
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| CN112199871A true CN112199871A (en) | 2021-01-08 |
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| CN202010964488.5A Pending CN112199871A (en) | 2020-09-14 | 2020-09-14 | Method for obtaining curved glass two-dimensional cutting graph |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105302951A (en) * | 2015-10-20 | 2016-02-03 | 北京工业大学 | Finite element mesh surface triangulation method |
| CN107538763A (en) * | 2017-08-23 | 2018-01-05 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | The processing method and curved surface honeycomb of a kind of curved surface honeycomb |
| CN109800524A (en) * | 2019-01-29 | 2019-05-24 | 福州大学 | Automobile wind shield glass molding simulation method based on COMSOL Multiphysics |
-
2020
- 2020-09-14 CN CN202010964488.5A patent/CN112199871A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105302951A (en) * | 2015-10-20 | 2016-02-03 | 北京工业大学 | Finite element mesh surface triangulation method |
| CN107538763A (en) * | 2017-08-23 | 2018-01-05 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | The processing method and curved surface honeycomb of a kind of curved surface honeycomb |
| CN109800524A (en) * | 2019-01-29 | 2019-05-24 | 福州大学 | Automobile wind shield glass molding simulation method based on COMSOL Multiphysics |
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