CAD System for Plastic Profile Extrusion Die Based on UG的翻译.doc

CAD System for Plastic Profile Extrusion Die Based on UG姓名：jeff2009 Second International Conference on Intelligent Computation Technology and AutomationCAD System for Plastic Profile Extrusion Die Based on UGJunmei XiGaohua LiaoNanchang Institute of TechnologyNanchang，ChinaEmail：wfm_77163comAbstractPlastic profile extrusion die have the complex structure，high demanding，heavy design workload and there are a lot of standard partsUG software as the platform, use of feature-based modeling technology and object-oriented programming techniques，plastic profile extrusion die CADmodeling system has been developed Through the main program created by the VC+ interaction with the UG，use of the basic principles of parametric design and feature-based modeling，realize computer automatic design for the part ofextrusion die module including graphic design die，mouth template design ,distributor-bracket, core-board and distributor prick System has a good human computer interaction，scalability and standardized mold designstandardsIt has been proved that can make the building of the part storeroom simplify，the speed of entity modeling improved，the design cycle shortened and the popularization of parts technology great usefulKeywordsPlastic Profile；UG；System of ModelingCAD；Extrusion DieIINTRODUCTIONPlastic profile extrusion molding is a continuous dynamic process，Plastics in the extruder，after a series of stereotypes process such as melting， plasticizing， steady flow， shunt， molding and cooling， thus becomingcontinuous profile products1Plastic profile many types，wide range used and plastic profile sections are more complex and changeable And its structure design of extrusion die is also complex，high demanding， design workload heavy At present， because of the lack of experience in the design and test mode，many processing equipment are general-purpose machine tools，die material selection and heat treatment and surface treatment technology lags， so that low quality of domestically produced extrusion die， low extrusion speed ， high frequency test mode， and long delivery cycle defectsExtrusion lines and extrusion die are more rely on importIn addition，in the design process of assembly is often encountered，such as bolts，pins and other standard partsIfmodeling every time，designers often make repetitive work and reduce design efficiency2UG software developed by EDS of the United States is one set of CADCAMCAE integrated highend softwareIt provides the whole processof product development solution Characterized of UG software is feature-based threedimensional solid modeling and parametric-driven approach It provides the second development kit for userIn the UGOpen API development platform, profile extrusion die components and standard parts are the research and developmentAnd creation of parameterized library， design of user interface，implementation of parametric dimension一drivenThere has greater theoretical and practical significance PROFILE EXTRUSION DIE CAD MODELINGExtrusion die CADCAM system is under the guidance of thought in the software engineeringTo ensure that entire system of nature， maturity， economic rationality， completion of the system has several aspects features and thought such as concurrent engineering thought，multi-track analysis procedures， closed-loop CAD and scalabilityPlastic profile extrusion die CAD system are including assembly system, modeling system and engineering drawing systemAll procedures are completed in VC+，and then connect with the*h to generate compiler*dll filesThe*dll，*dlg and menu files generated is stored under a specific directory to available the custom menu module in the UGAs shown in Fig1Figure 1CAD system of Extrusion DieIIIDIE GRAPHIC DESIGNAData Acquisition1) In the procedure profile section of graphics input，plastics profile section for graphics separately external featuresInternal features and local features stored separatelyInput calculation calculated separately and then together to design2) After the input program of extruding plastics and process parameters receive plastic profile cross-section of the graphics information，also required to obtain plastic extrusion die data(density，viscosity，power-law index，export expansion radio and the molding shrinkage rate)and the extrusion process parameters data(Profiles of velocity and traction profiles tensile shrinkage)According to the assumption we can see that the final size of profiles will be design die graphic with the actual data of the role of the above linear superpositionThe most substantial application of resin raw materials plasticsprofile is RPVC However， the different plastic formulations of manufacturers caused performance parameters and extrusion process parameters are different3Reasonable frame of reference such as table I：TABLE IPERFORMANCE PARAMETERS ANDPROCESSCOEFFICIENT OF THE REFERENCE RANGEBDetermination of graphics modeMouth templates are blank profiles extrusion die and plays a vital role on the export of profile form factor Die graphics are the key to mouth template design and also to the entire mold designMouth template design products areplastic profile sections similar variation，and it can make complicated Profile section further broken down into relatively simple and main profiles、with a specific function in function block structureThrough export expansion ratio，the tensile shrinkage rate I and the cooling shrinkage reflect the flow channel mold structure extrusion of material properties and extrusion process operation corresponding to template designAt the same time also reflects the size of profile main dimensions impact of Die Graphic Design and provides me basis for more accurate die design graphicsAssumptions for thin-walled plastic door and window profile，its exports expansion are onedimension，profile in the entire cooling process of cooling the deformation is also able to maintain a relatively stable stateIts coolingcontraction is linearWhere A, B，C is size after the role of cooling contraction expansion a，b，c is size before the role of cooling contraction expansionEXTRUSION DIE FLOW PATH DESIGNProfile Extrusion Die Flow Path is the part from the circular section at the entrance of mold to gradually changing for closer cross-sectional profile products shapeIt is an important part of extrusion die design and manufactureExtrusion die flow channel design objectives are materials resistance balance and flow symmetry for part of the nose section of the flow channel gapMaterials in the nose to produce a certain crowdingout speedMaterials of flow channel has a certain compression ratio，thus forming a certain crowdingout pressure to ensure gap resulting from the shunt easily healed and make products compacting 4The preliminary design of flow channel is mainly to resolve the flow channel inside the pressure drop balanceproblemIt is required to melt plastic micro-element stress analysis and fluid flow analysisAs shown in Fig2In order to guarantee extrusion constant，then the need to ensure that the pressure drop equal of the characteristics district when material extrusion from the mouth templateIn the design， the first calculation of the pressure dropmainstream channel and the calculation of the shunt pressure drop，then shunt channel in turn adjusted to match the mainstreamDifferent flow channel crosssection shape of the pressure drop calculation formula in tableV DIE TEMPLATE DESIGNTemplate plate design generally divided into molding board，pre-formed plate and compression plateAmong them，the molding plate and pre-formed exactly the same board designCompare with the molding plate and pre-shaping，compression plate design has more than a compressed angle parameterPlastic profile crosssection can be essentially seen as combination of characteristics such as the large number of small triangles，rectangular，circular and circular shapesThe length of its shape can be calculated to obtain from the formula of table2Irregular geometric crosssection can use the following formula5】 Straight length of the die is important parameter of the template designThe straight length of die is affected by factors such as raw materials(viscosity，thermal stability，etc)，profiles(mainly thickness)and the extruder(extrusion amount，back pressure)and othersAnd directly relate to production efficiency and cost-related At present， the straight length of the mold also can only be determinate by the experience-basedSystem used in the empirical formulaWhere，H is seamless high， is factorSystem give the recommend values =35，according to the actual situation by the designer to finalizeSHUNT BRACKETCORE AND DIVERSION CONEShunt bracket in me mold is the transition part of machine neck with the mold cavityFor hollow sections the indispensable core，separate cone are generally fixed at distributor-bracketIn the design module，according tosome theoretical design principles and longterm practical experience，the subcavity mold has become a variety of standardized norms of design and structure form 6-7By working with the computers interactive，comprehensiveconsideration of various factors， several the possible designs of the standardized form and structure to identify and selectTo design the relevant parameters such as the size and location of streaming rib and boltsVIIPROFILE EXTRUSION DIE DESIGN EXAMPLESComprehensive application 0f UGOpen Menu Script，UGOPEN UIStyler developed plastic profile extrusion die user interface，profile extrusion die CAD system user interface main menuThe design of the original data asfollows：a known section of plastic profile and the design of all the initial parameters are known modeling CAD subsystem shown in Fig3ADie Graphic DesignAfter running the main program，Click on the“extrusion die CAD system 1”“Die Graphic Design”Graphic Design shells die main interface dialogSelect from a section of the library and also be directly mapped new profile section，as to the design of the profile cross-section In the“graphics mode input parameter”interface type to determine the three die graphics design parameters：Export expansion ratio ， cooling shrinkage ， shrinkage stretching iFor RPVC，export expansion ratio of the value in between 105 to 115，cooling shrinkage of values between 0.001 to O01 and the tensile shrinkage ivalues between O0l to O08Click“start designing”controls die graphic designAfter graphic design die and return to the main dialog box mold graphic design interface，save die graphicsBDesign of The Extrusion Die TemplateIn the basis of calling the front designed die graphics， system according to die outside the outline of the size of graphics parameters can template of standard parts library1)Shunt bracket, core and diversion coneThe main interface of Shunt bracketcore and diversion cone adjust shunt template thicknessCalling contour line taken from import compression plate flow channel when design compression panelsThen to determine the nextlocation of shuntmeans of shunt and shunt core cone structureDetermine the point of diversion cone，example show in Fig.42)Design of forming plate and pre-formed plateMolding design and preformed plate are similar designIn main interface of the system design， based on calculations of the flow channel pressure drop and the length of forming integrated，give the design of the length and thickness of molding plate and pre-formingAfter call standard template library，users can be further adjusted examples of Fig53)Compression plate designEnter the main interface board of compression plate to Design compressed plate design Compression plate in addition to adjust the thickness of the template，there are a very important design parameter is the compression cornerCompression angle range is between 25 degrees to 50Also in order to meet the flow line and the template to generate the vertical intersection of the interface design principle，it should be taken from import compression plate flow channel contour line for the back of the bracket plate designed for useVIII CONCLUSIONSUG as a platform，the integrated use of parametric and interactive mapping technology， used object-oriented programming technology and database technologies，through the main program created by VC+ interaction with the UG，the successful development of a plastic profile extrusion die CAD modeling systemUsing system of plastic profile extrusion die can be more convenient to carry out computer-aided designPhysical sense，but also directly modify the model，can directly mold design for the latter to provide accurate three-dimensional data Reduce of product design，process and manufacture of the preparation aspect of the errorSignificantly improve the quality of extrusion die design and efficiencyAvoid a great deal of duplication of the design, greatly reduces the cost of die design，have a certain engineering application valueIX REFERENCES【1】 LI Xiao bing, BIAN Rui hua，“Design and produce of CADCAM system of injection mold based on UG”， Journal of Heilongjiang Commercial College，Vol18，No.2 2002，pp178-179【2】LIU Guo liang，LIU He-shen, etal，“Building of the StandardPart Database for P1astics Profile Extrusion Tooling Based on UG”，Plastics， Vo134,No1 2005，pp9396【3】Liang Wuke，Luo Xingqi，Zhang Yanning，etal，“Application of cracked beam element to analysis of cracked crankshaft”Journal of Dalian University of Technology，Vol43，NO5，2003，pp62763 1【4】Liu Bin Wang Minjie,“study on optimization design method of plastic extrusion die based on numerical analysis”Chinese Journal of MechanicalEngineering，Vol39, No5，2003，pp139一144【5】 LIU He sheng “Numerical simulation and experimental study on die swell of T-shaped plastic profile extrusion from a gas-assisted die”，Journal of Plasticity Engineering，Vo115，No1，2008，pp950-952【6】Liu Bin，Zheng Qingjuan，Liu Hua，“Surface Construction for the Streamlined Extrusion Die”，Journal of Huaqiao University，Vo126，No2，2005，pp172-175【7】ZHAO Danyang，WANG Min jie，“optimization design method of extrusion die for complex profile”，Journal of Dalian University of Technology，Vo148，No2，2008，pp198-204作者： Junmei Xi， Gaohua Liao作者单位： Nanchang Institute of Technology Nanchang, China2009年第二届智能计算机技术及其自动化国际会议基于UG的塑料异型材挤压模具CAD系统 席军梅 廖高华南昌理工学院 （中国 南昌）电子邮件：wfm_77163.com摘要 塑料异型材挤压模具具有复杂的结构，高的技术要求，很大的设计工作量，还有许多标准件。使用UG软件作为设计平台，利用基于特征的建模技术和面向对象的编程技术，塑料异型材挤压模具的CAD建模系统已经研制成功。通过VC+的互动，使用UG来创建的主程序，使用参数化设计的基本原则和基于特征的建模技术，实现了挤压模具的部分模块的计算机自动设计，包括图形设计模具，模具腔设计，支架分配，核心及其导流锥分配设计。系统具有良好的人机互动的、可扩展性的和规范化的模具设计标准。实践证明，它可使部分存储器的设计简化，是实体建模速度提高，使设计周期缩短，对零件的普及推广方面具有巨大的帮助。关键词 塑料异型材；UG；建模系统；CAD；挤压模具、导言塑料异型材挤压模具造型是一个连续的动态过程。对于塑料挤压机，经过一系列的定型过程，如熔融、塑化、稳定流动、分流、程序和冷却，从而成为流畅的外形轮廓产品1，塑料型材的种类很多，有广泛的使用范围，截面也是复杂多变的，而且挤压模具的结构设计也是复杂的，高要求的，设计工作量也很繁重。目前，由于缺乏在设计和测试模板上的经验，许多加工设备是通用机床，模具材料的选择和热处理以及表面处理技术落后，因此国内生产的挤压模具存在质量低下，挤压速度低，高频率的测试方式和交货周期长等缺陷，使挤压生产线和挤压模具更加依赖于进口。此外，在装配设计过程中往往遇到如螺栓、销等标准件。对于每一次造型，设计师常常会重复的工作，因而降低了设计效率2.美国EDS公司开发的UG软件是以集CAD/CAM/CAE技术于一体的高端软件。它提供了产品开发全过程的解决方案。UG的特点是基于特征的三维实体造型和参数化驱动方法。它为用户提供了二次开发工具，在UG/Open API开发平台上，型材挤压模具的组件和标准件是研究和开发的基础。而且，参数化图库创造，用户界面设计，一维参数化驱动，这些都有更大的理论意义和现实意义。、型材挤压模具的CAD建模挤压模具的CAD/CAM系统在软件工程思想的指导下，为了确保整个系统的性能、承受极限、经济合理性，系统的建成有几方面的思想和特点，如一致的工程思维，多路径的分析程序，闭环CAD控制系统及其可扩展性。塑料异型材挤压模具CAD系统包括装备系统、建模系统和工程绘图系统。在VC+上完成所有程序，然后连接*.h文件区生成*.dll编译文件。生成的*.dll文件、*.dlg和菜单文件被存储在特定的目录下，以便于在UG中自定义常规的菜单模块。如图1所示。塑料异型材挤压模具CAD系统 装配系统CAD建模系统工程绘图系统 模具绘图模切板形状和流道分流支架板核心与导流锥图1 挤压模具CAD系统、模具绘图设计A 数据采集1）在输入图形型材截面的过程中，绘制的型材截面各自的外部特征、内部特征和局部特征分别进行存储，在输入计算机后单独计算，然后共同设计。2）在输入挤压塑料的程序和工艺参数，系统接收塑料型材的截面图形信息，还需要获得塑料挤压模具数据（密度、粘度、幂律指数、输出膨胀率和成型收缩率）和挤压工艺参数数据（成型速率和型材的拉伸和收缩）根据假设，我们可以看到，型材最终的尺寸将是根据上述线性叠加作用而形成的实践数据来决定的设计模具图形，大量应用的树脂塑料是ROVC。然而，不同的制造商的塑料配方将引起性能参数和挤压工艺参数的不同3。如表1 参考合理的框架。 表1挤压温度 剪切率 粘度系数 幂律指数n 180200 1001000 0.340.45输出膨胀率模具收缩量牵引收缩量i挤压速度v(m/min)1.051.150.000.080.010.081.53.0B 图形模式的测定模板腔是空白的型材挤压模具，在型材型材因素中起重要作用。模具形状是模板腔设计的关键，也是整个模具设计的关键。模板腔产品使塑料型材截面发生类似的改变，使复杂的型材截面进一步细分为相对简单的和在功能块结构中具有特定功能的主要型材。通过输出膨胀率，拉伸收缩率i，及其冷却收缩都反映流道模具结构，材料挤压性能和对应于模具设计的挤压工艺操作，同时也反映了模具图形设计时主要维面型材的尺寸，为更准确的模具设计绘图提供了基础。假设有薄壁塑料门窗型材，它的输出膨胀是一维的，型材在整个冷却降温过程中变形能够保持在一个相对稳定的状态。它的冷却收缩是线性的。输出膨胀比率 （1） 拉伸收缩 （2）冷却收缩 （3）其中 A、B、C是冷却收缩扩张作用之后的尺寸 a、b、c是冷却收缩扩张作用之前的尺寸、挤压模具流道设计型材挤压模具流道是一个零件，这个零件从模具圆截面进入逐步变为更密切的横截面型材制品的形状。它是挤压模具设计和制造的重要部分，挤压模具流道设计的目标是在流道间隙的部分实体截面上实现材料阻力平衡和对称流动。在机头部分的材料产生一定的挤出速度，在流道中的材料具有一定的挤压比。因此形成一定的挤出压力以确保缺口处分流愈合，使产品密实4.流道的初步设计主要为了解决流道内部的压力降平衡问题。它需要对融化塑料进行微元应力分析和流体流动分析，如图2所示。 图2 流体微型机械分析图为了确保挤压量恒定，就需要在模具腔挤压材料时保证典型区域的压力降相等。在设计中线计算主流道的压降，接着计算分流压降，然后对分流通道一次调整以符合主流通道。不同的流道截面形状，压力降的计算公式如表2 表2 假塑料流体压力降计算公式圆形管道 环形间隙 矩形间隙 表中 表示流动度，表示剪切力，表示剪切速率，m表示流动指标，k表示稠度，v表示速度。、模具模块设计模块板设计一般分为成型板、欲成板和压缩板，在它们当中，成型板和欲成板具有完全相同的电路板设计。相比较于成型板和预成板，压缩版的设计另外多出一个压缩角参数。塑料型材的横截面基本上可以看做是一个特征组合，如大量的小三角形、长方形和圆形。这些形状的长度尺寸可以通过表2中的公式进行计算。对于不规则的几何截面可以用下面公式5. 模具的直线长度尺寸是模具设计的重要参数。它受一