基于UG的标准斜齿圆柱齿轮及变位齿轮的参数化建模所在学院机械工程学院专业名称机械设计制造及其自动化年级二零一零级学生姓名、学号指导教师姓名、职称讲师完成日期二零一零年五月摘要摘要齿轮是机械行业中被广泛应用的零件之一，齿轮轮齿的精确三维造型被视为齿轮机械动态仿真、NC加工、干涉检验以及有限元分析的基础。但在UG7.0软件上并没有专门的模块，所以本文详细阐述的是在UG7.0平台上建立斜齿圆柱齿轮及变位齿轮三维模型的新方法。由于斜齿轮的轮廓线不是标准曲线，想实现齿轮造型的精确建模有一定的难度。斜齿轮常用的成型方法是扫掠成型法，但此方法实现的建模不准确。为了改变这种缺点，本论文提出了通过建立渐开线、齿根过渡曲线对称方程，精确计算出了分界齿数与曲线起始、终止角度，以自由形式特征下的扫掠为工具的解决方案。该方法符合标准斜齿圆柱齿轮齿廓线的定义,可以实现齿轮的精确建模。通过实例建模，此方法同样适用于变位齿轮的参数化建模，提高了变位齿轮工程设计的效率。关键词：斜齿轮及变位齿轮；渐开线；过渡曲线；对称方程；参数化建模ⅠABSTRACTGearisthemachineryindustryiswidelyappliedinoneoftheparts,andgearofgeartoothaccuratethree-dimensionalmodelingisregardedasdynamicsimulation,NCgearmachineryprocessing,theinterferenceofthefiniteelementanalysistestandthefoundation.ButinUG7.0softwareandnospecialmodule,sointhispaperexpoundsinUG7.0platformisestablishedonthehelicalgearshiftgearsandthreedimensionalmodelofthenewmethod.Becausetheoutlineofthehelicalgearlineisnotstandardcurve,wanttorealizetheprecisegearmodellingmodelinghasthecertaindifficulty.ThehelicalgearcommonlyusedtheshapingmethodissweepingChengXingFa,butthismethodofmodelingisnotaccurate.Inordertochangethisweakness,thispaperputsforwardthroughtheestablishmentoftheinvolutetoothroot,transitioncurveequationofsymmetry,accurateboundarycalculatedwithcurvestarting,terminationnumberAngle,thefreeformthesweepingcharacteristicsforthetoolsolutions.Thismethodaccordwithstandardhelicalgeartoothprofilelineofthedefinition,canrealizetheprecisemodelinggear.Throughtheexamplemodeling,thismethodisalsoapplicabletoshiftgearsofparameterizedmodeling,improvethegearshiftoftheprojectdesignefficiencyKeywords:Thehelicalgearandshiftgears;Involute;Transitioncurve;Symmetricalequation;Parameterizedmodeling目录1引言...............................................................11.1国内外的研究现状及发展趋势....................................11.2课题研究内容..................................................21.3课题研究的意义................................................21.4参数化建模策略................................................31.5Unigraphics介绍..............................................42斜齿轮的基本参数与几何尺寸计算......................................52.1斜齿轮基本参数................................................52.2设置齿轮参数和相关尺寸计算....................................52.2.1前、后端面齿廓曲线的生成.................................62.2.2齿根过渡曲线的建立.......................................83标准斜齿圆柱齿轮的参数化建模......................................113.1基圆直径小于齿根圆直径即Z>分界齿数时........................113.1.1设置斜齿轮基本参数......................................113.1.2斜齿轮计算参数的设置....................................113.1.3创建斜齿轮前、后端面齿廓................................123.1.4建造齿轮模型时的表达式.................................133.1.5创建螺旋线..............................................153.1.6创建螺旋齿.....................................
