CN112440416A - Flow design method of casting roller - Google Patents
Flow design method of casting roller Download PDFInfo
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- CN112440416A CN112440416A CN202011184425.4A CN202011184425A CN112440416A CN 112440416 A CN112440416 A CN 112440416A CN 202011184425 A CN202011184425 A CN 202011184425A CN 112440416 A CN112440416 A CN 112440416A
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- casting
- flow
- roller
- casting roller
- temperature rise
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
- B29C41/26—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length by depositing flowable material on a rotating drum
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/52—Measuring, controlling or regulating
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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
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mechanical Engineering (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a flow design method of a casting roller, which comprises the steps of firstly establishing a casting film, the casting roller and a cooling medium geometric model respectively, then discretizing a geometric model calculation region, importing the discretized calculation region into numerical simulation software, then carrying out boundary condition/physical property parameter setting and numerical iteration calculation to obtain the three-dimensional temperature field distribution characteristics of the casting roller, the casting film and the cooling medium, then extracting casting film axial temperature rise information, drawing a film axial temperature rise curve, finally obtaining a film axial temperature rise slope-cooling medium flow velocity relation curve, and calculating by combining a flow calculation formula to obtain the flow Q meeting the design requirement. The invention can quickly realize the flow design of the casting roller and obtain the flow parameters meeting the design requirements. The method specifically comprises the steps of obtaining a corresponding relation between the axial temperature rise slope and the flow speed of the casting roller in a modeling simulation mode, substituting a flow calculation formula according to the relation, and obtaining the flow size required by the casting roller, wherein the method is rapid and accurate.
Description
Technical Field
The invention belongs to the technical field of extrusion tape casting, and particularly relates to a flow design method of a tape casting roller.
Background
Extrusion casting is a main mode of film production, raw material resin is extruded from a die head in an extruder after being melted, and the melted resin is cast onto a casting roller with a smooth surface through the die head and is rapidly cooled into a film.
The cooling forming process of the casting film mainly occurs on a casting roller, the casting roller is a steel roller with a larger diameter, an inner sleeve is arranged in the casting roller in a hollow mode, a spiral flow deflector is welded on the inner sleeve, and a cooling medium flow channel is formed in the space among the steel roller, the inner sleeve and the flow deflector. The cooling medium carries out heat exchange through flowing in the runner, and the balance of heat exchange can be guaranteed to suitable cooling medium flow, makes the curtain coating membrane reach required cold design requirement after the curtain coating roller. At present, no research design is specially designed for the flow of the cooling medium in the casting roller, the proper flow of the cooling medium is obtained mainly by experience and continuous debugging, and the method is time-consuming, labor-consuming, high in cost and inaccurate.
Disclosure of Invention
The invention aims to provide a flow design method of a casting roller, which can quickly realize flow design of the casting roller, obtain flow parameters meeting design requirements and provide technical compliance for supporting equipment of a water circulation system of the casting roller.
In order to achieve the purpose, the technical scheme of the invention is as follows: a flow design method of a casting roller is characterized in that: the method comprises the following steps:
s1: and respectively establishing a geometric model of the casting film, the casting roller and the cooling medium.
S2: and respectively carrying out calculation area discretization on the geometric models of the casting film, the casting roller and the cooling medium.
S3: and importing the scattered calculation region into numerical simulation software, and performing boundary condition setting, physical property parameter setting and numerical iteration calculation in the numerical simulation software.
S4: after the numerical simulation software is calculated, the three-dimensional temperature field distribution information characteristics of the film, the casting roller and the cooling medium are obtained.
S5: and extracting an axial temperature rise curve of the cast film, and carrying out data analysis on the axial temperature rise curve to obtain a corresponding relation between the axial temperature rise slope and the flow speed.
S6: and repeating the steps S3-S5 to obtain a plurality of corresponding relations between the axial temperature rise slopes and the flow velocity, and drawing a curve graph of the relation between the axial temperature rise slopes and the flow velocity of the cooling medium.
S7: calculating to obtain a flow Q according to a flow calculation formula and a relation curve of the axial temperature rise slope and the flow velocity of the cooling medium:
；
wherein A is the area of the flow path of the casting roller,
the coefficient related to the angle of the spiral flow guide strip of the casting roller is V, and the V is the flow velocity in a single spiral flow channel.
Further, the casting roller is any one of a main cooling roller, a secondary cooling roller and an embossing roller in the casting industry.
Further, the casting film is a film formed by casting extrusion.
Further, the cooling medium is a cooling fluid for cooling the casting film.
Further, the numerical simulation software may be any one of ANSYS, ABAQUS, STAR-CCM, OPENFOAM simulation software.
The invention has the beneficial effects that: by adopting the method, the flow design of the casting roller can be quickly realized, and the flow parameters meeting the design requirements can be obtained. The method specifically adopts a modeling simulation mode to obtain the corresponding relation between the axial temperature rise slope and the flow rate of the casting roller, and the whole process is operated on a computer, so that the method is rapid and accurate.
The method can adapt to the flow design of the casting rollers with different pipe diameters and different widths, and the flow parameters obtained by calculation according to the method can provide technical support for the matching equipment of the cooling circulation system of the casting rollers.
Description of the drawings:
FIG. 1 is a schematic flow diagram of the present invention.
FIG. 2 is a graph showing the relationship between the slope of the axial temperature rise and the flow rate of the cooling medium in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to fig. 1 and 2 and the following embodiments.
As shown in fig. 1, a flow rate designing method of a casting roll of the present invention comprises the steps of:
s1: and respectively establishing a geometric model of the casting film, the casting roller and the cooling medium.
The cooling medium is a fluid medium, and may be selected from water, liquid ammonia, air, and other conventional cooling media. The cooling medium and the casting film are respectively arranged at two sides of the casting roller, and the cooling medium flows in the casting roller to realize heat transfer; the cast film is heat transferred to the cooling medium by the casting roll. The casting film is a film formed by casting extrusion; such as polyethylene film, polypropylene film, composite film, etc.
S2: calculating area discretization is respectively carried out on the geometric models of the casting film, the casting roller and the cooling medium, and particularly, grid division forms such as tetrahedral grids, hexahedral grids and mixed grids can be adopted.
S3: importing the scattered calculation region into numerical simulation software, and performing boundary condition setting, physical property parameter setting and numerical iteration calculation in the numerical simulation software; wherein the boundary conditions include thermal boundary conditions, coupling heat transfer boundary conditions, and inlet and outlet boundary conditions; the physical parameters include the parameter settings of density, thermal conductivity and specific heat.
Wherein, the numerical simulation software can be any one of ANSYS, ABAQUS, STAR-CCM and OPENFOAM numerical simulation software.
S4: and after the numerical simulation software calculates, the three-dimensional temperature field distribution information characteristics of the casting film, the casting roller and the cooling medium are obtained.
S5: and extracting an axial temperature rise curve of the casting film, and carrying out data analysis on the temperature rise curve to obtain the relation between the temperature rise slope K and the flow velocity V.
S6: and repeating the steps S3-S5 to obtain a plurality of temperature rise slope-flow velocity corresponding relations, and drawing an axial temperature rise slope-cooling medium flow velocity relation curve chart.
S7: calculating to obtain a flow Q according to a flow calculation formula and a relation curve of the axial temperature rise slope and the flow velocity of the cooling medium:
wherein A is the area of the flow path of the casting roller,
the coefficient related to the angle of the spiral flow guide strip of the casting roller is V, and the V is the flow velocity in a single spiral flow channel.
The specific flow calculation process is as follows: if the film width is D, assuming that the film width is D and the axial temperature rise of the film is less than W ℃, the flow rate can be estimated as follows:
1) according to the requirement, the axial temperature rise is less than W ℃, and the slope K = W/D of the axial temperature rise is calculated;
2) according to the slope K, inquiring the flow velocity V of the cooling medium in the spiral flow channel when the slope is K from the graph in FIG. 2;
3) from the flow velocity V, a flow Q calculation can be performed:
wherein A is the area of the flow path of the casting roller,
the coefficient related to the angle of the spiral flow guide strip of the casting roller is V, and the V is the flow velocity in a single spiral flow channel.
The invention has wide application range, can meet the flow design of casting rollers of different models, and the casting roller can be any one of a main cooling roller, a secondary cooling roller and an embossing roller for heat exchange in the casting industry.
The embodiments have been specifically described above with reference to the drawings, but the present invention is not limited to the above embodiments, and those skilled in the art can adopt other embodiments without departing from the spirit of the present invention.
Claims (5)
1. A flow design method of a casting roller is characterized in that: the method comprises the following steps:
s1: respectively establishing a geometric model of the casting film, the casting roller and the cooling medium;
s2: respectively carrying out calculation area discretization on the geometric models of the casting film, the casting roller and the cooling medium;
s3: importing the scattered calculation region into numerical simulation software, and performing boundary condition setting, physical property parameter setting and numerical iteration calculation in the numerical simulation software;
s4: after numerical simulation software is calculated, the three-dimensional temperature field distribution information characteristics of the casting film, the casting roller and the cooling medium are obtained;
s5: extracting an axial temperature rise curve of the cast film, and carrying out data analysis on the axial temperature rise curve to obtain a corresponding relation between an axial temperature rise slope and the flow speed;
s6: repeating the steps S3-S5 to obtain a plurality of corresponding relations between the axial temperature rise slopes and the flow velocity, and drawing a relation curve graph of the axial temperature rise slopes and the flow velocity of the cooling medium;
s7: calculating to obtain a flow Q according to a flow calculation formula and a relation curve of the axial temperature rise slope and the flow velocity of the cooling medium:
wherein A is the area of the flow path of the casting roller,
the coefficient related to the angle of the spiral flow guide strip of the casting roller is V, and the V is the flow velocity in a single spiral flow channel.
2. A flow rate designing method of a casting roller according to claim 1, characterized in that: the casting roller is any one of a main cold roller, a secondary cold roller and an embossing roller in the casting industry.
3. A flow rate designing method of a casting roller according to claim 1, characterized in that: the casting film is a film formed by casting extrusion.
4. A flow rate designing method of a casting roller according to claim 1, characterized in that: the cooling medium is a cooling fluid for cooling the casting film.
5. A flow rate designing method of a casting roll according to any one of claims 1 to 4, characterized in that: the numerical simulation software is any one of ANSYS, ABAQUS, STAR-CCM and OPENFOAM simulation software.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011184425.4A CN112440416B (en) | 2020-10-30 | 2020-10-30 | Flow design method of casting roller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011184425.4A CN112440416B (en) | 2020-10-30 | 2020-10-30 | Flow design method of casting roller |
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| Publication Number | Publication Date |
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| CN112440416A true CN112440416A (en) | 2021-03-05 |
| CN112440416B CN112440416B (en) | 2022-11-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113386292A (en) * | 2021-05-20 | 2021-09-14 | 大连理工大学 | Casting roller and three-factor parameter orthogonal experimental method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6606948B1 (en) * | 2002-03-11 | 2003-08-19 | Heidelberger Druckmaschinen Ag | Method for controlling a chill roll system |
| CN111611698A (en) * | 2020-05-13 | 2020-09-01 | 广东省智能制造研究所 | Ultra-thin body heat transfer simulation method |
-
2020
- 2020-10-30 CN CN202011184425.4A patent/CN112440416B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6606948B1 (en) * | 2002-03-11 | 2003-08-19 | Heidelberger Druckmaschinen Ag | Method for controlling a chill roll system |
| CN111611698A (en) * | 2020-05-13 | 2020-09-01 | 广东省智能制造研究所 | Ultra-thin body heat transfer simulation method |
Non-Patent Citations (1)
| Title |
|---|
| 宋言明等: "非晶带材成形用冷却铜辊内流道传热数值模拟", 《锻压技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113386292A (en) * | 2021-05-20 | 2021-09-14 | 大连理工大学 | Casting roller and three-factor parameter orthogonal experimental method |
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| CN112440416B (en) | 2022-11-08 |
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