CN1916917A - Method for designing determinatus model cavity based on heating power coupling - Google Patents
Method for designing determinatus model cavity based on heating power coupling Download PDFInfo
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- CN1916917A CN1916917A CNA2006100476742A CN200610047674A CN1916917A CN 1916917 A CN1916917 A CN 1916917A CN A2006100476742 A CNA2006100476742 A CN A2006100476742A CN 200610047674 A CN200610047674 A CN 200610047674A CN 1916917 A CN1916917 A CN 1916917A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000008878 coupling Effects 0.000 title claims abstract description 11
- 238000010168 coupling process Methods 0.000 title claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 11
- 238000010438 heat treatment Methods 0.000 title 1
- 238000013461 design Methods 0.000 claims abstract description 72
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000013507 mapping Methods 0.000 claims abstract description 7
- 229920003023 plastic Polymers 0.000 claims abstract description 7
- 239000004033 plastic Substances 0.000 claims abstract description 7
- 230000002441 reversible effect Effects 0.000 claims description 12
- 239000000498 cooling water Substances 0.000 claims description 4
- 230000001788 irregular Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 5
- 238000001125 extrusion Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000007493 shaping process Methods 0.000 abstract description 3
- 238000004458 analytical method Methods 0.000 abstract description 2
- 238000011161 development Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 230000000930 thermomechanical effect Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
本发明属于模具设计技术领域，特别涉及到一种基于热力耦合的定型模型腔设计方法。其特征是利用有限元软件对定型模内塑料异型材冷却过程进行热力耦合分析，获得型材的等效应变场，采用主壁对称和功能块旋转的映射方法，即以主壁变形后的最高点为坐标原点建立直角坐标系，主壁变形曲线和型腔设计曲线关于X轴对称，功能块以原点为中心旋转，直接将型材热变形结果映射成定型模型腔反变形设计轮廓。本发明的效果和益处是避免了传统经验设计法的缺点，具有设计周期短、精度高、效率高的特点，较大缩短了挤出模具设计的开发周期，显著地降低了模具设计成本。本方法适用于成型塑料异型材的定型模型腔的设计。
The invention belongs to the technical field of mold design, and in particular relates to a method for designing cavity of a stereotyped model based on thermal-mechanical coupling. Its characteristic is to use finite element software to conduct thermomechanical coupling analysis on the cooling process of plastic profiles in the shaping mold to obtain the equivalent strain field of the profiles, and to use the mapping method of main wall symmetry and function block rotation, that is, the highest point after the deformation of the main wall Establish a Cartesian coordinate system for the coordinate origin, the main wall deformation curve and the cavity design curve are symmetrical about the X axis, the function block rotates around the origin, and directly maps the thermal deformation results of the profile to the anti-deformation design contour of the cavity of the stereotyped model. The effect and benefit of the invention is to avoid the disadvantages of the traditional empirical design method, and has the characteristics of short design period, high precision and high efficiency, greatly shortens the development period of extrusion die design, and significantly reduces the cost of die design. The method is suitable for the design of a stereotyped mold cavity for forming plastic profiled materials.
Description
Technical field
The invention belongs to the mould design field, relate to the design of the stock mould die cavity that is used for polymer-extruded production, specially refer to a kind of stock mould cavity design method based on Thermal-mechanical Coupling.
Background technology
At present along with the development of national economy and technology, industry-by-industry is increasing to the demand of plastic irregular profile, and as the design of the extrusion die of its shaping jig with make also relatively backward.Stock mould is the important component part of extrusion die, is directly determining the Forming Quality and the productive capacity of section bar.The die cavity of stock mould inside is directly determining the dimensional accuracy and the surface quality of section bar especially.Because profile shapes complex-shaped and often have staggered interior muscle, even by the optimal design water channel,, that is to say that profile shapes is can not cooling velocity in full accord so that the temperature field can not distribute is very even, so section bar to produce distortion be inevitable.The effective ways that address this problem are exactly that the stock mould die cavity adopts the reversible deformation design.At present, the main experience design method that adopts of common reversible deformation design, this method need be carried out die trial repeatedly and be repaired a die, and makes mould manufacture and design cycle stretch-out, and cost increases, and efficient reduces, and the product precision is low.The defective of mould design need can not satisfy mould and produce short period, high-precision requirement by debugging repeatedly for a long time and could solving.
Summary of the invention
The purpose of this invention is to provide a kind of stock mould cavity design new method based on Thermal-mechanical Coupling, design result can be directly used in the design of instructing stock mould, solves the problem that cycle is long, efficient is low, precision is low that present plastic irregular profile is extruded stock mould design in the production.
Technical scheme of the present invention is:
The present invention utilizes finite element analysis software by plastic irregular profile cooling procedure in the stock mould is carried out coupled thermal mechanical, obtain the equivalent strain field of section bar, adopt the mapping method of main wall symmetry and functional block rotation, directly section bar thermal deformation result is mapped to stock mould die cavity reversible deformation design profile.
The main wall symmetry that the present invention proposes and the mapping method of functional block rotation, main process is: with the peak after the main wall distortion is true origin, horizontal direction is an X-axis, vertical direction is a Y-axis, set up rectangular coordinate system, main wall deformation curve and cavity design curve are about the X-axis symmetry, and functional block is the center rotation with the initial point.
The main process that the present invention carries out the section bar coupled thermal mechanical is to carry out under stock mould cooling water channel prerequisite reasonable in design, that is to say before carrying out the section bar coupled thermal mechanical, need carry out the optimal design and the special-shaped design of cooling water channel in the stock mould.
The purpose that the present invention carries out the water channel optimal design is for section bar cooling velocity in stock mould is consistent, on the basis of finishing stock mould inner profile cooling procedure numerical simulation, with each point cooling uniformity and efficient on the section bar cross section, stock mould exit is objective function, location parameter with water channel is a design variable, and the medial temperature in section bar cross section is a state variable.
The special-shaped design of the water channel that the present invention carries out is a kind of non-Rule Design, is a kind of particular design according to special cooling requirement, its objective is on the basis of optimal design, further improves the cooling effect at section bar master position, wall turning and functional block position.
Effect of the present invention and benefit are: by the optimal design and the special-shaped design of water channel, significantly improve the cooling uniformity and the efficient of section bar; Carry out stock mould die cavity reversible deformation design on this basis based on Thermal-mechanical Coupling, design has important significance for theories and using value to this method to stock mould, this method has been avoided the shortcoming of traditional empirical design, have the advantages that the design cycle is short, precision is high, efficient is high, and the defective of mould design can be found rapidly and be corrected on computers, the bigger construction cycle that shortens the extrusion die design, reduce the mould design cost significantly, be particularly suitable for not having the governed new product development of experience.This method is applicable to the design of the stock mould die cavity of moulding plastics profile shapes.
Description of drawings
Fig. 1 is based on the stock mould cavity design process flow diagram of Thermal-mechanical Coupling.
Fig. 2 stock mould and section bar X-Y scheme.
Fig. 3 dividing elements figure.
The temperature field distribution plan in section bar cross section, stock mould exit after Fig. 4 initial designs.
The temperature field distribution plan in section bar cross section, stock mould exit after Fig. 5 optimal design.
The temperature field distribution plan in section bar cross section, stock mould exit, Fig. 6 water channel special-shaped design back.
Fig. 7 section bar equivalent strain field pattern.
Fig. 8 stock mould die cavity reversible deformation design diagram.Dotted line is represented the section bar thermal deformation among the figure, and solid line is represented stock mould die cavity profile.
Stock mould die cavity profile diagram after Fig. 9 reversible deformation design.
Figure 10 is based on the stock mould photo of reversible deformation design.
Embodiment
Be described in detail most preferred embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
Produce the design of the stock mould die cavity of PVC section bar SF56, the embodiment step as shown in Figure 1:
Step 1
According to profile structure characteristics initial designs cooling water channel, foundation is used for the stock mould of moulding SF56 and the two dimensional model of section bar in finite element software ANSYS, as shown in Figure 2.
Step 2
Adopt Solid Triangl 6node Unit 35 of ANSYS that model is carried out dividing elements, the zone big to thermograde (near transverse section of section material and the water channel) divided thin, as shown in Figure 3.
Step 3
Apply starting condition and mainly comprise the physical property of section bar and stock mould and the initial temperature of stock mould, section bar and chilled water etc.Applying boundary condition mainly comprises: the convection transfer rate between section bar and the stock mould, water is convection transfer rate between convection transfer rate and section bar inner chamber air and the section bar etc. between water and the water channel but.
Step 4
Find the solution, be provided with aftertreatment.As can be seen from Figure 4, the cooling velocity of section bar each several part in stock mould is inconsistent, and thermal stress will make defectives such as goods generation torsional deformation, interior breaking of muscle and tendon split, and such water channel design obviously is irrational, must be optimized design to the water channel position.
Step 5
With stock mould exit section bar cross section cooling uniformity and efficient is objective function, is design variable with the location parameter of water channel, is state variable with the medial temperature in section bar cross section, and the water channel position is optimized design.As can be seen from Figure 5, the cooling of section bar each several part is comparatively even after the water channel optimal design.Yet although cooling effect makes moderate progress, the cooling effect at section bar master position, wall turning and functional block position is general, need carry out the abnormal shape design of water channel.
Step 6
Carry out the abnormal shape design and the numerical simulation of water channel.As can be seen from Figure 6, water channel section bar each several part cooling after the abnormal shape design is more even.
Step 7
Convert hot cell to structural unit, apply Boundary Conditions in Structures, carry out the structural stress analysis, obtain the field distribution of section bar equivalent strain, as shown in Figure 7.
Step 8
Carry out stock mould die cavity reversible deformation design, be designed to example with the reversible deformation in the section bar upper left corner and be illustrated, concrete steps are as follows as shown in Figure 8:
1. the O point is the peak after the main wall distortion on the section bar, is initial point with the O point then, and horizontal direction is an X-axis, and vertical direction is a Y-axis, sets up rectangular coordinate system XOY;
2. the A point is the minimum point after the main wall distortion on the section bar, and curve OA is OA ' about the curve of X-axis symmetry:
3. other curve of this functional block of section bar is a rotation center with the O point, rotates to A ' point from the A point;
4. the mapping method of section bar cross section other parts in like manner.Use the stock mould die cavity profile after this mapping method is finished the reversible deformation design, as shown in Figure 9.
Step 9
According to the actual cover stock mould of having made of reversible deformation design result, as shown in figure 10.Through the operation of the actual production on SF56 section bar extruding production line, rely on the stock mould of empirical design to compare with tradition, shape product dimensional accuracy and surface quality that the stock mould cooling and shaping of this method design goes out all are significantly increased, correctness and the validity based on the stock mould cavity design method of Thermal-mechanical Coupling that have proved directly therefore that the present invention proposes.
Claims (2)
1. stock mould cavity design method based on Thermal-mechanical Coupling, it is characterized in that utilizing finite element software the stock mould cooling water channel to be optimized on the basis of design and special-shaped design, the coupled thermal mechanical of carrying out to plastic irregular profile cooling procedure in the stock mould, obtain the equivalent strain field of section bar, adopt the mapping method of main wall symmetry and functional block rotation, directly section bar thermal deformation result is mapped to stock mould die cavity reversible deformation design profile.
2. a kind of stock mould cavity design method according to claim 1 based on Thermal-mechanical Coupling, main wall symmetry and functional block rotation mapping method are characterised in that: with the peak after the main wall distortion is true origin, horizontal direction is an X-axis, vertical direction is a Y-axis, set up rectangular coordinate system, main wall deformation curve and cavity design curve are about the X-axis symmetry, and functional block is the center rotation with the initial point.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100476742A CN1916917A (en) | 2006-09-04 | 2006-09-04 | Method for designing determinatus model cavity based on heating power coupling |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006100476742A CN1916917A (en) | 2006-09-04 | 2006-09-04 | Method for designing determinatus model cavity based on heating power coupling |
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| CN1916917A true CN1916917A (en) | 2007-02-21 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169518A (en) * | 2011-03-24 | 2011-08-31 | 西北工业大学 | Accurate forming method for precise-casting turbine blade die cavity |
| CN102682171A (en) * | 2012-05-15 | 2012-09-19 | 中国电子科技集团公司第五十四研究所 | Method for compensating thermal deformation of mold for high-precision composite material antenna reflector unit |
| CN104573206A (en) * | 2014-12-26 | 2015-04-29 | 山东钢铁股份有限公司 | Profile steel section thermal shape and size design method based on finite element thermal coupling |
| CN104625073A (en) * | 2015-02-02 | 2015-05-20 | 福立旺精密机电(中国)有限公司 | Reversible deformation treatment technology for mould with deformed outline of metal injection forming product |
| CN106777491A (en) * | 2016-09-09 | 2017-05-31 | 东莞市燕秀信息技术有限公司 | A kind of method in dynamic creation mold cooling water road |
-
2006
- 2006-09-04 CN CNA2006100476742A patent/CN1916917A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169518A (en) * | 2011-03-24 | 2011-08-31 | 西北工业大学 | Accurate forming method for precise-casting turbine blade die cavity |
| CN102682171A (en) * | 2012-05-15 | 2012-09-19 | 中国电子科技集团公司第五十四研究所 | Method for compensating thermal deformation of mold for high-precision composite material antenna reflector unit |
| CN102682171B (en) * | 2012-05-15 | 2014-12-31 | 中国电子科技集团公司第五十四研究所 | Method for compensating thermal deformation of mold for high-precision composite material antenna reflector unit |
| CN104573206A (en) * | 2014-12-26 | 2015-04-29 | 山东钢铁股份有限公司 | Profile steel section thermal shape and size design method based on finite element thermal coupling |
| CN104625073A (en) * | 2015-02-02 | 2015-05-20 | 福立旺精密机电(中国)有限公司 | Reversible deformation treatment technology for mould with deformed outline of metal injection forming product |
| CN106777491A (en) * | 2016-09-09 | 2017-05-31 | 东莞市燕秀信息技术有限公司 | A kind of method in dynamic creation mold cooling water road |
| CN106777491B (en) * | 2016-09-09 | 2019-12-27 | 东莞市燕秀信息技术有限公司 | Method for dynamically creating mold cooling water channel |
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