基于UG 鼓式制动器设计的参数化研究【中文4600字】【PDF+中文WORD】

基于UG 鼓式制动器设计的参数化研究【中文4600字】【PDF+中文WORD】,中文4600字,PDF+中文WORD,基于,UG,制动器,设计,参数,研究,中文,4600,PDF,WORD 【中文4600字】 基于UG 鼓式制动器设计的参数化研究 Liu Hongpu,Peng Erbao 机械工程，河南理工大学，Henan473009，中国 摘要 本文运用UG软件的设计和研究上的制动器的类型参数。论基础离散化的原则，离散对制动鼓的结构图案。选取的典型特征制动器总成的三维参数化建模工作的各个部分，以构建一个模型来参数库调用。 ©2011下的[南的责任由发布Elsevier公司的选择和/或同行审查 关键词：刹车; UG，参数化，离散化;研究 制动器是汽车行业的关键部件。随着社会的快速发展和人民生活水平的提高对制动器的设计汽车提出了更为严格的要求。不仅要满足制动的基本性能要求，还要满足环境保护的严格要求。本文主要研究在制动鼓上的参数化设计。 1，制动离散 随着参数的变化，在模板特点下可能出现的变化情况： 一）特征维护不变，只有通过受电弓的大小重现;二）结构特征性改变。 上述两种变化情况，在实际操作中，因为选择使用模拟目标不同大小，所以模板必须设计的不是很大，因此，主要有第一类的情况下，在特性保修范围的大小变化。当参数变化是相当 大时，是第二种情况，申请建立模板必须全面描述模型。当然，如果一个模板更接近模型，它必须手动增加的特点就会减少，但这种模板所具有的代表性和典型性相对差一些;模板与待建模型之间有一定的差距，需要手动增加的特性是多方面的，但其代表性和典型性都好一些。这是一对相互矛盾的，在该构建体中应该找一个比较好的平衡点，这样既可以建立代表 模板，并加快零部件的设计速度。 然后根据一定的分离规则，分离各型号相应的刹车零部件，从这些部件中撤销典型的特征，形成模板参数化设计要求。 需要遵守的规则有： 1.1 近似元提取相同的特征。 1.2 单独特有的部分进行特征提取。 1.3 进行特征提取时，应尽可能撤销相似的特征。 1.4 特征提取，考虑其实现的可能性。 鼓式制动器离散化之后，组件如下： * 摩擦盘（大约两片）; * 刹车蹄片（型）; * Sells on consignment˗ * 制动轮缸主体（类型）； * 活塞（类型）； * 皮碗（类型）； * 制动鼓（型）； * 制动底板（型）； * 变动的支承杆（类型）； * 弹簧（类型）； * 附件（衬套防尘套，活塞防尘套，泄气螺栓螺母，进油口防护罩，密封圈，螺栓防松橡皮筋保护，分离主缸离开油密密封环及各种弹簧等） 上述名单后仅是离散的组件统一名称，具体的就下命名，有许多种特性不同的组件，这个请求分别建立模板，以满足下缸体名需求攻方设计，例如，具有至少5个各种不同类型的气缸体，因此，必须单独建立的模板。虽然提取合理的制动带模板的一定的周期，而且还建立了许多特殊的特性组件模板，所以说从本质上来说，它是基于每个组件离散。选择模板离散元件后，并按照要求的尺寸制作新组件模型，再组装制动系统。 当每个组件为参数化，参数的整数必须严格控制，必须尽可能的使用尽可能少的参数来描述整个组件。当然,这里参数是指可以改变大小的，部件大多数尺寸需要使用这些成为可能，以改变驱动的大小（即变化为自变量，写的是尺寸驱动函数形式），也就是引起了众多大小来进行连接，使整体联动，完成参数化建模工作。 2. 制动参数 本设计采用基于特征的参数化建模方法，实现了汽车制动零部件快速设计和自动设计。因此，需要明确以下一些具有特征的相关概念。 2.1.特征定义 特征是高层次的抽象描述，设计师描述设计对象的功能，形状，结构，制造，装配，检测，管理和使用信息，并具有准确的项目的含义等的关系。特征模型用逻辑的相互依存，相互进行描述和表达的影响语义网络的特性实例和关系。与低层次的几何形状比较元件表面，侧面，所表达的几何实体的方法所不同的是：该特性模型表达了高水平的具有功能意义的实体，如孔，槽等，其操作对象不是原始的几何元素，但为该产品的功能要素，在产品技术信息和管理信息，体现了设计者的意图。 2.2.特征分类 特点是产品描述信息集。不同的应用领域和不同的对象，特征抽象和分类方法是不同的。通过分析机械产品的大量零部件蓝图信息和加工工艺信息，可构成成分特征划分为五个大类： 经营特色：随着组件管理相关通信集合，包括标题栏信息（例如组件名称，图表或插图编号，设计者，设计日期等），各组分的材料，并没有倾倒的信息，如粗糙度等。 技术特点：描述组件的性能和规格通信集合。 材料热处理特点：与元件材料及热处理通信集合，像材料的性能，热处理方式，硬度值的程度等有关。 精密特性：描述元件的形状，大小许可量变化通信集合，包括公差（尺寸公差和形状位置公差）和表面粗糙度。 形态特征：通信集合这都与描述元件的形状，大小，包括函数的形状，加工工艺造型，装配辅助形状有关。 组装特性：组件相关的方向，相互活性表面和协调关系。 在上述特征中，形状特征是描述元件或产品最重要的特征。其可分离主要特征和辅助特征，前者是用来描述结构对象的基本几何形状，后者是其中进行表达的对象部分的形状特征。 2.3.特征关系 为了描述中的特征之间的关系，可应用于特征类，特征实例的概念。特征类是关于类型特征的描述，是所有相同的信息特征的总结。该典型例子是具体特征后，特征属性的评价，特征是类的成员。其中特性类和典型例子有如下关系： 继承涉及的特征之一。构成层次关系，这是位于水平更高权限被称为超类特性，位于水平较低的水平上被称为亚组的特性。该子组特征可以继承的超类特征的属性和方法的，这种继承关系被称为关系。另一种继承关系的特征是类和这种特性的例子，这种关系被称为关系之间的关系。例如，一些具体的圆柱是一个例子，圆柱特征类，它们之间反映的关系。 相邻关系。反映了形状特征之间的相互位置关系，与CONT表示。间的构成邻接关系形状特征邻接条件可以共享。有关例如，阶梯轴，每相邻的两个轴部的之间的关系是毗连关系，其中每个相邻表面条件可以共享。 从属关系是关于形状特征符合，或者连接的关系的描述，表明与 辅助。下属形状特征依赖于形状特征是服从是存在的，就像是附着在圆柱斜边。 引用关系：特征描述类作为连接属性，它的相互引用，表示与重组。引用关系主要存在于引用的形状特征的精确特性，该材料特性。 2.4.特征建模 基于特征的描述产品的特性所作为建模的基本元素称为建模技术的方法。特征建模可能诱发大约分为三个种类的互动特性定义，识别和设计基于特征的图案。 互动特性的定义。使用现有的几何造型系统建立产品的几何模型，用户在图形交互计划流程定义特征的几何要素，并添加信息，例如特性参数或精度，规格，材料热处理等，以几何模型为属性。这种建模方法的自动化程度低，产品数据共享也是难实现的，在信息处理过程中很容易出现人为错误。 特征识别。它定义预先特性进行了比较几何模型，确定特征的具体类型和其他信息。通常它是由通过以下步骤：（1）在搜索产品的几何形状的数据库相匹配地形特征的几何模型;（2）从其自己区分数据库撤回特征信息为：（3）定特性参数为：（4）完成对特征几何模型为：（5）结合了简单的特点，以成为新的特点。 基于特征的设计。用户直接定义了组件的几何实体的特性，不久之后在特征库预先定义特征实例化，例如取特征为基本单元建立特征模型，从而完成产品的定义和设计。 2.5.参数化设计 参数化设计是定义了几何图形的大小值并且赞同组参数的大小关系，提供给设计者进行几何造型使用。该参数的办法很简单，在参数和设计对象的尺寸控制有明确的对应关系，设计结果修改接收驱动的大小。在生产中常用的monlding在设计对象的结构形状，序列化的标准字母属于这种类型的产品。如图1参数化设计系统的原理。 几何形状 方程 几何约束 案例匹配 应用示例 几何尺寸 参数化设计系统原理图1 2.6.参数设计 在参数设计的过程中，搜索从CAD图形文件的约束关系，然后打开图形大小固定到参数化图形自动，新开发的参数绘图软件算法将被认为是有利的旧图表参数化改造。目前，这是最方法的参数化设计应用。关于系列化，通用化和标准化的定型产品（如模具，夹具，液压缸，组合机床，阀门等）的设计的数学模型和产品结构，运用一切都是相对固定不变的，只有产品混合尺寸有差异，结构尺寸的差异是造成年由相同数目和类型数据取离散值的不同规格的产品设计。这类产品可以取代它的变化以及产品规格与相应的变量的基本参数，然后根据这些数据和基本参数，使用电脑自动查询图形数据库，通过在专用绘图软件自动设计图屏幕。如图2的参数化设计过程。 3d模型 读设计参数 参数化设计方法 修改设计参数 推导出新的三维模型 图23-D模型的参数化设计过程 3． 三维实体参数化设计 参数化建模的主要思想是，以显示产品模型的形状特征与几何约束，数学方程和关系，从而设计具有类似的形状和功能。参数化实体建模的关键是几何约束关系的提取和表达，解决方案以及参数化几何模型结构。多种几何约束关系，可以写一种特定格式的文件，包括联立方程组（即用户编程）中，输入电脑，驱动几何设计组。例如，确定一个立方体的约束条件L， W，H可形成使用多维数据集中的建筑面积和底面周长，面对人工智能知识的表达方式，这种方式将描述几何结构的体魄，几何和拓扑结构与步逻辑谓语形式的约束关系，将读取的知识库。一方面是知识的表达方式是改变到表单的标记来表示每一种类型的数据，求标记解决方案，而另一方面则增加了几何推理基础上的克制，求数值解，从而实现在更大程度机械产品智能化设计。的三维参数化模型是两个主要的部分是由几何模型和约束信息组成。根据什么尺寸约束和拓扑信息模型结构的顺序，也就是它们之间的相互依存关系，参数化建模可分为两类先后。一种是几何约束作用于固定拓扑体质几何组织，几何约束值不会改变几何模型的拓扑结构，但改变了几何模型的标称尺寸。 这种参数化建模系统的引用B边界表示作为其内部表达主要模式。另一种是解释了参数化模型的几何构成要素第一和它们之间的约束关系，但模型的拓扑结构是由约束关系决定。这种参数化建模系统采取南玻表达式作为内部的主要模式，可能会改变满量程实体模型的拓扑结构，并有利于结构记录整个过程的程序形式。 4． 制动鼓模型的建立范例 通过对制动鼓分离的部件的结构分析中，组件建模可以使用三种建模方法。 4.1．使用部件的钣金建模 钣金建模和参数化的过程是类似的实体建模，通过二维原理图计划组件相关特性，加入了克制，并标记相关的大小。使用弧形侧板的工作模块，坑的操作，冲压消除等制作的三维实体模型。通过表达把主要参数与次要参数关联。像图3是制动蹄片的金属模型。 图3金属片的3-D模型参数化设计 4.2．罗塔范围怎么定，例如弹簧使用的规则的曲线函数建模版 取弹簧作为一个例子，首先分析每个点的弹簧的结构，并表示例如假设弹簧外环直径的基本功能，内孔直径，转弯等等的主要参数，然后编辑记录的规则功能在X，Y，例如主参数的基础上，Z轴方向的规则曲线弹簧 X1=半径-r1-cos(dir*180*t)*rl Y1=r1*sin(dir*180*t)+高+wire-dia/2+r+l 移动这些规则曲线函数，可能会产生弹簧的中心路径曲线，再通过扫掠产生弹簧全实体模型，如图4。 图5机箱的3-D模型参数化设计 参考文献 [1]关欣，沉峻峰，关人美，詹军;。鼓式制动器的多柔体ADAMS建模与仿真。 汽车技术，2007，（10）。 [2]梦洁。基于参数化技术的鼓式制动器设计系统的开发研究。河北工业大学，2009，（6）:17-24。 [3]关欣，沉峻峰，关人美，詹军;。鼓式制动器相关参数，其制动效能的影响。科学技术与工程，2009，（4） [4]张平。汽车鼓式制动器类型。 [P]2007，（6）。 [5]胥永康。汽车制动。汽车实用技术2004，（1）。 作者 刘轰蒲（1964 - ），男，籍贯：南阳市，河南省。河南省数控技术教学团队的成员。本科：河南工业职业技术学院机械工程系，副教授，学历的老师。研究方向：机械制造，CAD / CAM。 地址：河南工业职业技术学院机械工程系473009 1876-6102©2012由海南大学负责发布 由Elsevier公司选取和/或同行审查。 DOI：10.1016/j.egypro.2012.02.095 Energy Procedia 17 (2012)279 285 1876-6102 2012 Published by Elsevier Ltd.Selection and/or peer-review under responsibility of Hainan University.doi:10.1016/j.egypro.2012.02.095 2012 International Conference on Future Electrical Power and Energy Systems The Study of the Parameterization of the Drum Brake Design Based on UG Liu Hongpu,Peng Erbao Mechanical Engineering,Henan Polytechnic Institute,Henan473009,China Abstract This text apply UG software to the design and study on the type parameter of the brakes.On the basis of the principles of discretization,discretize the structural pattern of the brake drum.select the typical characteristic of the brake assemblies and the individual parts of the 3d parameterization modeling work,to build a model for parameterization library calls.2011 Published by Elsevier Ltd.Selection and/or peer-review under responsibility of name organizer Keywords:the brakes;ug;parameterization;discretization;research The brake is the key components of the car industry.with the rapid development and people living standards improve in the design of the brake the car raised a more stringent requirements.not only to satisfy the brake the basic properties are required,to satisfy the stringent requirements of the environmental protection.this article mainly study on the brake drum the parameterization design.1.The Brake Discretization With the parameter change,the change situation which in the template characteristic possibly appears:a)the characteristic maintenance is invariable,is only the size reproduce by pantograph;b)the structure characteristic changes.Above two kind of change situation,in actual operation,because selects the template with the simulated target size difference which must design is not very big,therefore mainly has the first kind of situation,the size changes in the characteristic maintenance scope.when the parameter change quite is fierce,is the second kind of situation,this request establishment template must describe the model comprehensively.Certainly,if a template closer model,the characteristic which must increase manually are less,but this template has representative and typical nature bad somewhat;The template with awaits construction the model to have certain disparity,needs to increase manually the characteristic are many,but its representation and typical nature are good somewhat.This is a pair of contradictory,in the construct Available online at 2012 Published by Elsevier Ltd.Selection and/or peer-review under responsibility of Hainan University.280 Liu Hongpu and Peng Erbao /Energy Procedia 17 (2012)279 285 of the template should find a quite good balance point,like this can both establish the representative template,and speeds up the spare part the design speed.Then according to certain separate rule,is separated each model brake the corresponding spare part,withdraws the typical characteristic from these spare parts,forms the template that the parameterization design request.The deference separate rule is:1.1.Approximate components extraction same characteristic.1.2.Peculiar part alone carries on the characteristic extraction.1.3.Carries on the characteristic extraction,should withdraw the similar characteristic as far as possible.1.4.Characteristic extraction,considers its realization the possibility.After the drum brake discretization,components is as follows:?Friction disk(about two pieces);?Bbrake shoe(type);?Sells on consignment?The cylinder body(type)?Piston(type);?Leather cup(type);?Brake drum(type);?Brake shield plate(type);?Fluctuates the supporting pole(type);?Spring(type);?The appendix(bushing dirt-proof boot,piston dirt-proof boot,deflates bolt nut,oil inlet safety mask,seal packing collar,bolt guards against loose rubber band,separates master cylinder to leave oil tight sealing ring and each kind of spring and so on)After above lists only is the discretization the components unification name,regarding under a specific name,there are many kind of characteristic different components,this request separately establishes the template,to satisfy the demand about the design,for instance under the cylinder body name,has at least 5 kind of different type cylinder bodies,therefore must establish the template separately.Although extracted certain cycle of songss brake to take the template,but has also established many special characteristic components template,therefore said from essentially,its based on each components discretization.After the choice discretization template components,and defer to the request the size to produce the new components model,again assembles the brake system.When each components is parameterized,the parameter integer must control strictly,must use as far as possible few parameters to describe the entire components.Size which certainly here parameter refers to the size which is may change,the components majority of sizes needs to use which these to be possible to change the size actuation(i.e.changes is independent variable,writes is actuated size function form),also is causes the multitudinous sizes to be connected,causes the overall linkage,completes the parameterization modeling work.Liu Hongpu and Peng Erbao /Energy Procedia 17 (2012)279 285 2812.Brake Parameterization This design uses the method based on the characteristic parameterization modeling,realizes the automobile brake spare part fast design and the automatic design.Therefore needs to make clear following several with the characteristic correlation concept.2.1.Characteristic definition Characteristic is high level abstract description that the designer describe the design object the function,the shape,the structure,the manufacture,the assembly,the examination,the management and the use information and the relations which has the accurate project meaning and so on.The characteristic model use logic in the interdependence,mutually carries on the description and the expression for the influence semantic network to the characteristic instance and the pare with the low level geometry element surface,side,expressed the geometry entity method the difference is:The characteristic model expresses the high level to have the function significance entity,like the hole,the trough and so on,its operation object is not the primitive geometry element,but is the product function essential factor,the product technical information and the management information,manifests designers intention.2.2.Characteristic classification Characteristic is the product description information set.The different application domain and the different object,the characteristic abstract and the classified method is different.Through analyzing mechanical product massive components blueprint information and the processing craft information,may constitute the components characteristic to divide into five big kinds:?Management characteristic:With the components management related communications ensemble,including the title block information(for example components name,chart or illustration number,designer,design date and so on),the components material,has not poured information such as roughness and so on.?Technical characteristic:Description components performance and specification communications ensemble.?Material heat treatment characteristic:associated with components material and heat treatment communications ensemble,like material performance,heat treatment way,degree of hardness value and so on.?Precision characteristic:Description components shape,size permission amount of variation communications ensemble,including common difference(size common difference and shape position common difference)and surface roughness.?Shape characteristic:The communications ensemble which are related to description components shape,size,including function shape,processing craft shape,assembly auxiliary shape.?Assembles characteristic:Components correlation direction,mutual active surface and coordinate relations.In the characteristic above,the shape characteristic is most important characteristic that describes the components or the product.Its separable primarily characteristic and the auxiliary characteristic,the former is used to describe the structure object basic geometry shape,the latter is the characteristic which carries on the expression to the object partial shape 2.3.Characteristic relation In order to describe the relation among characteristic,may apply the concept of characteristic class,the characteristic example.The characteristic class is the description about the characteristic type,is summary of all same information characteristic.The characteristic example is specific characteristic after the 282 Liu Hongpu and Peng Erbao /Energy Procedia 17 (2012)279 285 characteristic attribute evaluation,is the member of characteristic class.Among the characteristic class,the characteristic example,the characteristic class and the characteristic example has relation as follows:?Inherits relates.Constituted level relation among the characteristic,which is located the level higher authority to be called the ultra kind of characteristic,is located the level lower level to be called the subgroup characteristic.The subgroup characteristic may inherit the ultra kind of characteristic the attribute and the method,this kind of inheritance relation is called the relation.Another kind of inheritance relation is the relation between characteristic class and this kind of characteristic example,this kind of relation is called the relation.For example,some concrete circular cylinder is a example that circular cylinder characteristic class,among themselves has reflected the relation.?Adjacent relation.Reflected the mutual position relations among the shape characteristic,indicated with CONT.Among the constitution adjacency relation shape characteristic adjacency condition may share.For example,a steps and ladders axis,between each neighboring two axis sections relations are the syntopy,in which each adjacency surface condition may share.?Hypotaxis.the description about shape characteristic compliance or the attached relations,indicated with IST.The subordinate shape characteristic relies on in the shape characteristic which is subordinated is existed,like bevel edge attached in circular cylinder.?Quote relation.describing characteristic class as the connection attribute which the quotes mutually,indicated with RE.The quotation relation mainly exists in the quotation that the shape characteristic to the precision characteristic,the material characteristic.2.4.Characteristic modeling The method that describing product by characteristic as the modeling fundamental element is called modeling technology based on the characteristic.The characteristic modeling may induce approximately into three kind of patterns that the interactive characteristic definition,the trick recognition and the design based on the characteristic.?Interactive characteristic definition.Using the existing geometry modeling system establishment product geometry model,the user,definition characteristic geometry essential factor in the graph interactive plan process,and add the information for example characteristic parameter or precision,specification,material heat treatment and so on to geometry model as the attribute.This kind of modeling methods automaticity is low,product data sharing is also difficulty realized,in the information processing process it is easy to arise the artificial mistake.”.?Characteristic recognition.the characteristic which defines in advance is carried on the comparison geometry model,definite characteristic concrete type and additional information.Usually it is composed by the following steps:?Searching product geometry database,match characteristic topo geometry model;?Withdraws the characteristic information from the database which oneself distinguishes;?Definite characteristic parameter;?Completes characteristic geometry model;?Combines the simple characteristic to become the new characteristic.?The design based on characteristic.The user directly defines components geometry entity with the characteristic,after soon in characteristic storehouse pre-definition characteristic instantiation,take example characteristic as basic unit establishment characteristic model,thus completes the product the definition or the design.2.5.Parameterization design Parameterization design is defines the geometric figure size value and agrees the size relations with group of parameters,provides to the designer to carry on the geometry modeling use.The parameters solution is simple,the parameter and the design object control size has the explicit corresponding relations,the design result revision receives the size actuation.In the production commonly used the product which Liu Hongpu and Peng Erbao /Energy Procedia 17 (2012)279 285 283monlding in the design object structure shape,the serialized standard letter belongs to this type.Parameterization design system principle as shown in Figure 1.2.6.Parameter design In the process of the parameter design,search the restraint relations from the CAD graphic file,then turn the graph fixed size into the parameterization graph automatic,the new development parameter cartography software algorithm will be supposed to be advantageous to the old chart parameterization reconstruction.At present,this is the most methods in the parameterization design applies.Regarding serialized,universalized and the standardized stereotypia product(for example mold,jig,hydraulic cylinder,aggregate machine-tool,valve and so on)s design the mathematical model and the product structure which uses all are relatively fixed invariable,only the product mix size have a difference,the difference of the structure size is caused by the same number and the type datum takes the discrete value in the different specification product design.This kind of product may replace the basic parameter which changes along with the product specification with the corresponding variable,then according to these data and the basic parameter,use the computer automatic inquiry graph database,designs the graph automatically by the special cartography software on the screen.As shown in Figure 2 for the parameterization design process.3.The Three Dimensional Entity Parameterization Design Parameterization modeling s main thought is to show the product model the shape characteristic with the geometry restraint,mathematics equation and the relations,thus the designs has the similar in the shape and the function.The parameterization entity modeling s key is the geometry restraint relations extraction and expression,the solution as well as the parameterization geometry model structure.Many kinds of geometry restraint relations,may write one kind of specific form document including the simultaneous equation group(i.e.user programming),inputs the computer,actuates geometry design in groups.For Fig.1 Principle of parameterized design system Fig.2 The course of 3-Dmodel Parameterized design hlauhsfo284 Liu Hongpu and Peng Erbao /Energy Procedia 17 (2012)279 285 example,determined a cube s constraint condition L,W,H may form using the cube the floor space and the bottom surface perimeter,face the expression way of artificial intelligence knowledge,this way will describe the restraint relations of the geometry physique,the geometry and topology with a step logic predicate form,and will read in the knowledge library.On the one hand the knowledge expression way is changes into the form by the mark to express each kind of type the data,seeking mark solution;On the other hand is adds on geometry inference based on restraint,seeking numerical solution,thus realizes the mechanical product intelligent design in a greater degree.The 3D parameterization model is two major part is composed by the geometry model and the restraint information.According to on what size restraint and the order of the topo information model structure,that is the interdependence relations between them,the parameterization modeling may divide into two kinds successively.One kind is the geometry restraint acting on the fixed topology physique geometry tissue,geometry restraint value does not change the geometry model topology,but changes the nominal size of the geometry model.This kind of parameterization modeling system take B-rep as its internal expression principal-mode.Another kind is explains the parameterization model the geometry integrant part first and the restraint relations between them,but model topology is decided by the restraint relations.This kind of parameter modeling system take CSG expression as internal principal-mode,may change the full-scale mockup topology,and is advantageous recording structure entire process by the procedural form.4.The Drum Brake Model Establishment Example Through to structure analysis of the drum brake separate components,the components modeling may use three modeling methods.4.1.Uses the plate work modeling of parts Plate work modeling and the parameterization process is similar to the entity modeling,through the two-dimensional schematic diagram plan components correlation characteristic,joins the restraint,and labels the related size.Using the operation of plate work module in curved side,the pit,the ramming eliminates and so on producing three-dimensional entity model.And associate main parameter with secondary parameter through expression.Like Figure 3 is the brake shoe sheet metal model.4.2.What about rotascope for example the spring use the rule curve function edition modeling Take the spring as an example,first analyzes the spring structure in each spot,and express the main parameter for example hypothesis spring outer annulus diameter with the fundamental function,the internal bore diameter,the turn and so on,then edits rule function of the spring in the rule curve in X,Y,the Z axis direction on the basis of the main parameter for example?rltdirrradiusX*180*cos11?rY?1?lrdiawireheighttdirrZ?2_*180*sin*11 Moves Fig.3 The3-D model Parameterized design of sheet metal Liu Hongpu and Peng Erbao /Energy Procedia 17 (2012)279 285 285these rule curve function,may produce the springs central path curve,again through sweeps plunders produce the spring full-scale mockup,as shown in Figure 4.4.3.May use the compound method modelling regarding the structure complex components Regarding the complex shape components often not to be able to realize using several modelling method any kind above,by now we might use the method above,use several methods to establish the geometry model we need.As shown in Figure 5 the brake chassis is uses compound method which the entity modeling and the sheet metal modeling unifies to complete.References 1Guan xin,Shen Junfeng,Guan renmei,Zhan jun.Drum brake multi-flexible body ADAMS modeling and simulation.Automobile technology,2007,(10).2Meng Jie.Drum brake design system development research based on parametrization technology.Hebei industrial university,2009,(6):17-24.3Guan xin,Shen Junfeng,Guan renmei,Zhan jun.Drum brake correlation parameter to its brake potency influence.Science technology and project,2009,(4)4Zhang Ping.Automobile drum type brake.P2007,(6).5Xu Yongkang.Automobile brake.Automobile practical technology 2004,(1).Author Liu Hongpu(1964-),male,native place:Nanyang city,Henan Province.The member of Henan Province numerical control technology teaching team.The teacher of Henan industry professional technology institute mechanical engineering department,associate professor,school record:Undergraduate course.Research direction:Machine manufacture,CAD/CAM.Address:Henan industry professional technology institute mechanical engineering department 473009 Fig.5 The3-D model Parameterized design of chassis