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bodyBgs[3] = "/images/banner/s4.jpg"; bodyBgs[4] = "/images/banner/s5.jpg"; var randomBgIndex = Math.round( Math.random() * 4 ); //输出随机的背景图 document.write('<style>.banner{background:url(' + bodyBgs[randomBgIndex] + ') no-repeat 50% bottom}</style>'); //]]> </script> <section> <div class="banner" style="height:160px;"> </div> </section> <!-- 面包屑导航开始 --> <div class="container "> <nav class="sub_menu"> <ol class="breadcrumb"><span class="glyphicon glyphicon-list"></span> <li><a href="/">网站首页</a></li> <li><a title="技术文章" href="/bethel/NC">技术文章</a></li> <li><a title="数控文章" href="/bethel/news">数控文章</a></li> </ol> </nav> </div> <!--/sub_menu--><!-- 面包屑导航结束 --> <!-- 页面标题开始 --> <div class="title"> <h3><a>基于ANSYS Workbench立柱筋板布局对加工中心动态特性影响分析<small></small></a></h3> </div> <!-- 页面标题结束 --> <hr class="featurette-divider"> <!-- 中部开始 --> <div class="container"> <!-- 正文 --> <div class="lead" id="print"> <p> 现代制造加工业正向着高精度、高质量、 高效率的方向迅猛发展，因此数控机床的加工 性能面临着许多挑战，而数控机床的动态特性 是衡量其是否具备良好的加工性能的指标之 _。数控机床需要提高本身的动态性能，从而 提高其加工精度和加工质量来满足现代制造业 的需求。原加工中心是专门为加工航空发动机<br /> 叶轮而设计的机床，其动态性能的好坏直接影 响到对叶轮的加工精度。该加工中心机械主体 结构包括床身、立柱、滑鞍、主轴箱、双驱摇 篮式摆台等主要功能部件。机床薄弱部件的动 态刚度将会直接影响到整机的动态特性，因而 需要提升其动力学特性，满足机床对加工质量 和加工精度的要求[1]。下面以模态理论分析技<br /> 术为基础，采用ANSYS Workbench模态分析软 件分析立柱筋板不同布局形式对铣削加工中的 动态特性影响。<br /> 1模态分析理论<br /> 模态分析主要是研究系统物理参数模型、 模态参数模型以及非参数模型的关系，并通过 _定手段确定这些系统模型的理论及其应用的 _门学科[2]。随着计算机技术的高速发展，模 态分析得到快速的发展，并在各个工程领域中 得到普及和深层次的应用。<br /> 2加工中心模态分析<br /> 目前，高校及科研院所在对数控机床设计 阶段的模态分析主要是运用有限元软件完成。 ANSYS Workbench是新一代的集成并行框架 式的有限元仿真软件，它具有较高的求解精度， 可进行模态分析、静力学分析、谐响应分析等。 下面运用ANSYS Workbench软件对加工中心 进行模态分析。<br /> 2.1加工中心有限元建模<br /> 由于加工中心的复杂性，运用三维建模软 件 Croe、SolidWorks, UG 建模比在 ANSYS Workbench中建模更方便、快捷。本文通过三 维建模软件Croe建立加工中心整机模型，考虑 到模型在前期处理及后期的处理上会花费大量 时间和资源，在不影响有限元分析结果准确性 的基础上简化加工中心模型，如退刀槽、螺纹、 倒脚等。然后保存为x_t通用格式文件，导入 ANSYS Workbench软件中进行预处理，采用 Automatic进行网格划分，结合面处用弹簧阻尼 单元法[3]处理，预处理后模型如图1所示<br /> 2.2加工中心模态分析结果<br /> 在建立好加工中心有限元模型基础上对加 工中心采用底座施加完全约束来模拟床身采用 地脚螺栓固定形式，进行模态分析。结果如表 1所示，振型图如图2所示。<br /> 表1叶轮<a href='https://www.yujiangcnc.com/' target='_blank'>五轴加工中心</a>模态分析结果</p> <p> </p> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse;"> <tbody> <tr style="height: 12pt;"> <td width="70" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 52.8pt; padding: 0cm 0.5pt; height: 12pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">阶数</span></span><o:p></o:p></p> </td> <td width="80" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 60pt; padding: 0cm 0.5pt; height: 12pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">固有频率/Hz</span></span><o:p></o:p></p> </td> <td width="87" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 65.5pt; padding: 0cm 0.5pt; height: 12pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">振型描述</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 10.3pt;"> <td width="70" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 52.8pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">第一阶</span></span><o:p></o:p></p> </td> <td width="80" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 60pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">42.55</span></span><o:p></o:p></p> </td> <td width="87" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 65.5pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 7pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">立柱沿Z轴弯曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 10.1pt;"> <td width="70" valign="bottom" style="width: 52.8pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">第二阶</span></span><o:p></o:p></p> </td> <td width="80" valign="bottom" style="width: 60pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">46.72</span></span><o:p></o:p></p> </td> <td width="87" valign="bottom" style="width: 65.5pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 7pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">立柱沿X轴弯曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 11.5pt;"> <td width="70" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 52.8pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">第三阶</span></span><o:p></o:p></p> </td> <td width="80" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 60pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">51.01</span></span><o:p></o:p></p> </td> <td width="87" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 65.5pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 7pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">立柱绕Y轴扭曲</span></span><o:p></o:p></p> </td> </tr> </tbody> </table> <p>仿真结果显示：影响加工中心动态特性的 主要零件是立柱，如果想提高整机的动态特性， 可以考虑抑制最低阶固有频率的振型，即对立 柱结构进行改进。下面采用对立柱布置筋板的 形式提升立柱的动态性能。<br /> 3立柱筋板布局形式对立柱动态性能 影响<br /> 对立柱的改进是在原有结构模态分析的基 础上进行的，针对立柱较为薄弱的部分进行改 进，进而提高其本身刚度。主要改进是在原有 立柱实体中布置筋板，这样既能减少其本身质量，又能增加其刚度，进而提高整机的固有频 率。现在针对立柱内部筋板布局进行探究，研 究不同方式的筋板布局对立柱动态性能的影 响。对立柱筋板布局分别采用井字型筋板、米 字型筋板与X型筋板进行比较，如图3所示。<br /> 运用ANSYS Workbench软件对原始模型 立柱以及三种方式布置的筋板立柱进行模态分 析。结果如表2所示，振型图如图4所示。<br /> 表2立柱不同筋板布局模态分析结果</p> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="299" style="border-collapse: collapse;"> <tbody> <tr style="height: 24.85pt;"> <td width="47" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 35.25pt; padding: 0cm 0.5pt; height: 24.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt 11pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">阶数</span></span><o:p></o:p></p> </td> <td width="40" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 29.95pt; padding: 0cm 0.5pt; height: 24.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">原始</span></span><o:p></o:p></p> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">模型</span></span><o:p></o:p></p> </td> <td width="46" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 34.75pt; padding: 0cm 0.5pt; height: 24.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">X型</span></span><o:p></o:p></p> </td> <td width="53" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 39.75pt; padding: 0cm 0.5pt; height: 24.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 10.1pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">固有频率 井字型</span></span><o:p></o:p></p> </td> <td width="44" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 33pt; padding: 0cm 0.5pt; height: 24.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">米字型</span></span><o:p></o:p></p> </td> <td width="69" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 51.9pt; padding: 0cm 0.5pt; height: 24.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">振型</span></span><o:p></o:p></p> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">描述</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 11.85pt;"> <td width="47" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 35.25pt; padding: 0cm 0.5pt; height: 11.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">第一阶</span></span><o:p></o:p></p> </td> <td width="40" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 29.95pt; padding: 0cm 0.5pt; height: 11.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">33.49</span></span><o:p></o:p></p> </td> <td width="46" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 34.75pt; padding: 0cm 0.5pt; height: 11.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">42.37</span></span><o:p></o:p></p> </td> <td width="53" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 39.75pt; padding: 0cm 0.5pt; height: 11.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">44.53</span></span><o:p></o:p></p> </td> <td width="44" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 33pt; padding: 0cm 0.5pt; height: 11.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">48.76</span></span><o:p></o:p></p> </td> <td width="69" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 51.9pt; padding: 0cm 0.5pt; height: 11.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">基本无变化</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 11.35pt;"> <td width="47" style="width: 35.25pt; padding: 0cm 0.5pt; height: 11.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">第二阶</span></span><o:p></o:p></p> </td> <td width="40" style="width: 29.95pt; padding: 0cm 0.5pt; height: 11.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">56.62</span></span><o:p></o:p></p> </td> <td width="46" style="width: 34.75pt; padding: 0cm 0.5pt; height: 11.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">66.41</span></span><o:p></o:p></p> </td> <td width="53" style="width: 39.75pt; padding: 0cm 0.5pt; height: 11.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">68.87</span></span><o:p></o:p></p> </td> <td width="44" style="width: 33pt; padding: 0cm 0.5pt; height: 11.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">70.36</span></span><o:p></o:p></p> </td> <td width="69" style="width: 51.9pt; padding: 0cm 0.5pt; height: 11.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">弯曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 12.7pt;"> <td width="47" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 35.25pt; padding: 0cm 0.5pt; height: 12.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">第三阶</span></span><o:p></o:p></p> </td> <td width="40" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 29.95pt; padding: 0cm 0.5pt; height: 12.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">247.86</span></span><o:p></o:p></p> </td> <td width="46" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 34.75pt; padding: 0cm 0.5pt; height: 12.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt 11pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">256.64</span></span><o:p></o:p></p> </td> <td width="53" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 39.75pt; padding: 0cm 0.5pt; height: 12.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">263.78</span></span><o:p></o:p></p> </td> <td width="44" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 33pt; padding: 0cm 0.5pt; height: 12.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">266.31</span></span><o:p></o:p></p> </td> <td width="69" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 51.9pt; padding: 0cm 0.5pt; height: 12.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">扭曲</span></span><o:p></o:p></p> </td> </tr> </tbody> </table> <p>仿真结果显示：不同方式布置立柱筋板对 其振型影响较小，但是提升了立柱本身固有频 率，尤其是对立柱布置米字型筋板，立柱本身 的固有频率提升最大。因此，对立柱内部结构 改进选择米字型筋板布局。<br /> 4立柱结构改进对叶轮加工中心动态 性能影响<br /> 将改进后的立柱模型替换到加工中心整机 模型中，新模型如图5所示，并导入到ANSYS Workbench中进行模态分析。结果如表3所示。 振型图如图6所示。<br /> 表3立柱改进后加工中心模态分析结果</p> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse;"> <tbody> <tr style="height: 12pt;"> <td width="73" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 54.5pt; padding: 0cm 0.5pt; height: 12pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">阶数</span></span><o:p></o:p></p> </td> <td width="85" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 63.6pt; padding: 0cm 0.5pt; height: 12pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">固有频率/Hz</span></span><o:p></o:p></p> </td> <td width="90" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 67.2pt; padding: 0cm 0.5pt; height: 12pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">振型描述</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 10.3pt;"> <td width="73" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 54.5pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">第一阶</span></span><o:p></o:p></p> </td> <td width="85" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 63.6pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">52.95</span></span><o:p></o:p></p> </td> <td width="90" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 67.2pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 9pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">立柱沿Z轴弯曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 10.1pt;"> <td width="73" valign="bottom" style="width: 54.5pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">第二阶</span></span><o:p></o:p></p> </td> <td width="85" valign="bottom" style="width: 63.6pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">58.81</span></span><o:p></o:p></p> </td> <td width="90" valign="bottom" style="width: 67.2pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 9pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">立柱沿X轴弯曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 11.75pt;"> <td width="73" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 54.5pt; padding: 0cm 0.5pt; height: 11.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">第三阶</span></span><o:p></o:p></p> </td> <td width="85" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 63.6pt; padding: 0cm 0.5pt; height: 11.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">63.46</span></span><o:p></o:p></p> </td> <td width="90" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 67.2pt; padding: 0cm 0.5pt; height: 11.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 9pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">立柱绕Y轴扭曲</span></span><o:p></o:p></p> </td> </tr> </tbody> </table> <p>表4所示为立柱结构改进前后对铣削加工 中心动态特性影响结果的对比。<br /> 表4立柱改进前后加工中心固有频率对比表<br /> 阶数 固有频率/Hz</p> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse;"> <tbody> <tr style="height: 11.75pt;"> <td width="60" rowspan="2" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 45.1pt; padding: 0cm 0.5pt; height: 11.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">阶数</span></span><o:p></o:p></p> </td> <td width="114" colspan="2" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 85.45pt; padding: 0cm 0.5pt; height: 11.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">固有频率/Hz</span></span><o:p></o:p></p> </td> <td width="90" valign="top" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 67.7pt; padding: 0cm 0.5pt; height: 11.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="MsoNormal"><span style="font-size: 5pt;"> </span></p> </td> </tr> <tr style="height: 10.55pt;"> <td width="57" valign="top" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 42.95pt; padding: 0cm 0.5pt; height: 10.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 11pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">改进前</span></span><o:p></o:p></p> </td> <td width="57" valign="top" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 42.5pt; padding: 0cm 0.5pt; height: 10.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 14pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">改进后</span></span><o:p></o:p></p> </td> <td width="90" valign="top" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 67.7pt; padding: 0cm 0.5pt; height: 10.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">振型描述</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 10.3pt;"> <td width="60" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 45.1pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 13pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">第一阶</span></span><o:p></o:p></p> </td> <td width="57" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 42.95pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 11pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">42.55</span></span><o:p></o:p></p> </td> <td width="57" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 42.5pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 14pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">52.95</span></span><o:p></o:p></p> </td> <td width="90" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 67.7pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 10pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">立柱沿Z轴弯曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 10.1pt;"> <td width="60" valign="bottom" style="width: 45.1pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 13pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">第二阶</span></span><o:p></o:p></p> </td> <td width="57" valign="bottom" style="width: 42.95pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 11pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">46.72</span></span><o:p></o:p></p> </td> <td width="57" valign="bottom" style="width: 42.5pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 14pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">58.81</span></span><o:p></o:p></p> </td> <td width="90" valign="bottom" style="width: 67.7pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 10pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">立柱沿X轴弯曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 11.5pt;"> <td width="60" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 45.1pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 13pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">第三阶</span></span><o:p></o:p></p> </td> <td width="57" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 42.95pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 11pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">51.01</span></span><o:p></o:p></p> </td> <td width="57" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 42.5pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 14pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span lang="EN-US" style="font-size: 8pt;">63.46</span></span><o:p></o:p></p> </td> <td width="90" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 67.7pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 10pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span class="28pt"><span style="font-size: 8pt;">立柱绕Y轴扭曲</span></span><o:p></o:p></p> </td> </tr> </tbody> </table> <p>由以上分析结果可知，将立柱结构布置米 字型筋板，虽然整机振型没有发生太大的改变， 但是有效地提高了该加工中心整机的低阶固有频率，从而提高了加工中心的动态特性。<br /> 5结论<br /> 运用ANSYS Workbench软件对原加工中 心进行模态分析，发现立柱是其振动薄弱环节， 影响了整机动态性能。通过对立柱布置米字型 筋板，提高了整机低阶固有频率。改变整机中 振动变形最大的零部件，是提高整机动态特性 —种有效方法，有助于满足现代制造业对机床 加工性能的需求。</p></div> <div class="blank30"></div> <!-- tag --> <div class="blank10"></div> 标签： <a href='/index.php?case=tag&act=show&tag=%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>加工中心</a> <!-- 分类 --> <div class="blank10"></div> 分类： <a href='/bethel/type/jnc/type-1.html' target='_blank'>加工中心</a> <div class="blank30"></div> <!--自动调用自定义字段--> <div class="blank20"></div> <div class="blank30"></div> <!-- 投票 --> <script src="/index.php?case=vote&act=view&aid=1329"></script> <!-- 自定义表单开始 --> <!-- 自定义表单结束 --> <div class="blank60"></div> <!-- 上下页开始 --> <div id="page"> <strong>上一篇</strong><a href="/bethel/news/show_1328.html">高速卧式加工中心Y向导轨防护罩设计要点</a> <div 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