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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>精密复合式镗铣加工中心的结构优化<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> 6.3床身的结构优化 6.3.1筋板的布置型式比较<br /> 床身的原始设计筋板为“井”字型分布，在考虑到不同筋板的布局形式对床 身的静、动态特性影响，在“井”字型筋板的方形空格内添加单个斜向垂直对角 筋板，如图6.7所示，记为方案二；然后在“井”字型筋板的方形空格内分别添加 两个斜向垂直对角筋板，如图6.8所不，记为方案三。<br /> 6.3.2筋板布置型式对床身的静态特性的影响比较<br /> 床身的静刚度直接影响到机床对工件的加工精度和表面质量，是决定机床静态特性优良的重要指标，有限元的静力分析首先是校核材料的屈服强度是否高于最大屈服应力，以及静力分析时最大的变形量是否被允许，以最大变形量、最大应力、质量三个参数为评价条件，数据如表6.4所示。</p> <p>6.3.3筋板布置型式对床身的动态特性的影响比较<br /> 机床的弹性变形对零件的加工精度会有一定的影响，而由于机床的动态特性 不足而引起的机床振动对加工精度的影响约占40%左右，所以床身的动态特性也 是床身结构优化的一个关键方向，而模态分析中低阶模态最能反映出床身的动态 特性[61]。本文以床身的第一阶固有频率及相应阵型来反映床身的动态特性，表6.5 分别给出“井”、“米”与“X”三种筋板分布型式的床身固有频率及相应振型描 述，且“米”与“X”筋板分布型式的床身模态分析变形云图如图6.9与图6.10 所示。</p> <div> <table cellspacing="0" cellpadding="0" hspace="0" vspace="0" width="350" height="37"> <tbody> <tr> <td valign="top" align="left" height="37" style="padding-top:0cm;padding-right: 0cm;padding-bottom:0cm;padding-left:0cm"> <p class="MsoNormal" align="center" style="margin-left:1.0pt;text-align:center; line-height:12.25pt;mso-line-height-rule:exactly;mso-element:frame; mso-element-frame-width:262.3pt;mso-element-frame-height:28.1pt;mso-element-wrap: none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal:page; mso-element-left:177.35pt;mso-element-top:280.45pt;mso-height-rule:exactly"><span class="469pt">表</span><span class="460"><span lang="EN-US" style="font-size:9.0pt">6.5</span></span><span class="469pt">床身的固有频率与振型<br /> </span><span class="460"><span lang="EN-US" style="font-size:9.0pt">Table 6.5 Machine bed inherent frequency and vibration mode</span></span></p> </td> </tr> </tbody> </table> <!--[endif]--></div> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse;mso-table-layout-alt:fixed;mso-table-overlap: never;mso-padding-alt:0cm .5pt 0cm .5pt"> <tbody> <tr style="mso-yfti-irow:0;mso-yfti-firstrow:yes;height:22.1pt;mso-height-rule: exactly"> <td width="103" style="width: 77.3pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm 0.5pt; height: 22.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:9.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 430.8pt;mso-element-frame-height:84.7pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:84.95pt;mso-element-top: 312.35pt"><span class="469pt">方案</span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="170" style="width: 127.7pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm 0.5pt; height: 22.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: 0cm;margin-left:26.0pt;margin-bottom:.0001pt;text-align:center;text-indent: 0cm;line-height:10.0pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:430.8pt;mso-element-frame-height: 84.7pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:84.95pt;mso-element-top:312.35pt"><span class="469pt">一阶频率</span><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">/Hz</span></span><span style="font-size: 9.0pt"><o:p></o:p></span></p> </td> <td width="301" style="width: 225.85pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm 0.5pt; height: 22.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: 0cm;margin-left:65.0pt;margin-bottom:.0001pt;text-align:center;text-indent: 0cm;line-height:9.0pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:430.8pt;mso-element-frame-height: 84.7pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:84.95pt;mso-element-top:312.35pt"><span class="469pt">一阶振型描述</span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> </tr> <tr style="mso-yfti-irow:1;height:17.3pt;mso-height-rule:exactly"> <td width="103" style="width: 77.3pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm 0.5pt; height: 17.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:9.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 430.8pt;mso-element-frame-height:84.7pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:84.95pt;mso-element-top: 312.35pt"><span class="469pt">方案一</span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="170" style="width: 127.7pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm 0.5pt; height: 17.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: 0cm;margin-left:36.0pt;margin-bottom:.0001pt;text-align:center;text-indent: 0cm;line-height:10.0pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:430.8pt;mso-element-frame-height: 84.7pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:84.95pt;mso-element-top:312.35pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">219.26</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="301" style="width: 225.85pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm 0.5pt; height: 17.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: 0cm;margin-left:51.0pt;margin-bottom:.0001pt;text-align:center;text-indent: 0cm;line-height:9.0pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:430.8pt;mso-element-frame-height: 84.7pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:84.95pt;mso-element-top:312.35pt"><span class="469pt">床身中部向下有微小摆动</span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> </tr> <tr style="mso-yfti-irow:2;height:20.4pt;mso-height-rule:exactly"> <td width="103" style="width: 77.3pt; padding: 0cm 0.5pt; height: 20.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:9.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 430.8pt;mso-element-frame-height:84.7pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:84.95pt;mso-element-top: 312.35pt"><span class="469pt">方案二</span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="170" style="width: 127.7pt; padding: 0cm 0.5pt; height: 20.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: 0cm;margin-left:36.0pt;margin-bottom:.0001pt;text-align:center;text-indent: 0cm;line-height:10.0pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:430.8pt;mso-element-frame-height: 84.7pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:84.95pt;mso-element-top:312.35pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">223.64</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="301" style="width: 225.85pt; padding: 0cm 0.5pt; height: 20.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: 0cm;margin-left:51.0pt;margin-bottom:.0001pt;text-align:center;text-indent: 0cm;line-height:9.0pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:430.8pt;mso-element-frame-height: 84.7pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:84.95pt;mso-element-top:312.35pt"><span class="469pt">床身中部向上微小摆动</span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> </tr> <tr style="mso-yfti-irow:3;mso-yfti-lastrow:yes;height:24.95pt;mso-height-rule: exactly"> <td width="103" style="width: 77.3pt; border-style: none none solid; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm 0.5pt; height: 24.95pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:9.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 430.8pt;mso-element-frame-height:84.7pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:84.95pt;mso-element-top: 312.35pt"><span class="469pt">方案三</span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="170" style="width: 127.7pt; border-style: none none solid; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm 0.5pt; height: 24.95pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: 0cm;margin-left:36.0pt;margin-bottom:.0001pt;text-align:center;text-indent: 0cm;line-height:10.0pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:430.8pt;mso-element-frame-height: 84.7pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:84.95pt;mso-element-top:312.35pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">220.02</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="301" style="width: 225.85pt; border-style: none none solid; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm 0.5pt; height: 24.95pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: 0cm;margin-left:51.0pt;margin-bottom:.0001pt;text-align:center;text-indent: 0cm;line-height:9.0pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:430.8pt;mso-element-frame-height: 84.7pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:84.95pt;mso-element-top:312.35pt"><span class="469pt">床身中部向里向内微小摆动</span><span style="font-size: 9.0pt"><o:p></o:p></span></p> </td> </tr> </tbody> </table> <p>6.3.4基于层次分析法获取床身结构的最优方案<br /> 对上述所设计的“井”、“米”与“X”型筋板分布型式的床身进行综合性能 分析，以静态特性、动态特性以及质量三个指标对床身进行全面衡量，床身抵抗 弹性变形的能力是由床身的静态特性所决定的，床身在机床加工过程中抵抗振动 的能力是由床身的动态特性所决定的，而床身的质量仅考虑到床身的制造成本和 搬运的方便性，本文采用以床身的质量、静力最大变形量、模态一阶固有频率三 个指标作为目标函数，选用层次分析法(AHP)对三种筋板布置方式进行比较，其中 决策算法如图6.11所示。<br /> 在图6.11的层次分析模型中，从上至下分别为：总目标层、准则层与方案层[62]。 总目标层为在保证床身具有高的静动态特性的同时，尽量控制床身质量； HV HV %分别为准则层相对总目标层的权重系数。<br /> 在保证床身具有良好静动态特性的前提下，床身质量尽量越小越好，也就是 床身的质量倒数越大越好，给出3种方案的质量倒数矩阵：</p> <p>由式（6-10)可知，方案一的量化指标优于另外两种方案，所以在基于床身质 量大小控制、静动态性能优劣的综合比较，选择原始的方案一“井”字型作为最 优的筋板布局设计方案。<br /> 6.3.5筋板厚度对床身的静动态特性的灵敏度分析<br /> 为了提高复合式镗铣加工中心床身静刚度与低阶阵型频率，可以通过改变床 身的筋板厚度，使得静刚度尽可能的高，低阶振型频率尽可能高，质量尽可能不 发生大的变化。整个优化分析是基于有限元的仿真分析，在筋板厚度尺寸优化时， 提出以下两种优化方案。<br /> 1、优化一：优化纵筋板厚度<br /> 首先对床身的纵向筋板厚度进行优化，初始设计的纵筋板厚度为32mm，选取 的不同筋板厚度所对应的床身特性如表6.6所示，图6.12为各筋板厚度对结构的 静力变形和低阶阵型频率的灵敏度示意图。</p> <div> <table cellspacing="0" cellpadding="0" hspace="0" vspace="0" width="439" height="35"> <tbody> <tr> <td valign="top" align="left" height="35" style="padding-top:0cm;padding-right: 0cm;padding-bottom:0cm;padding-left:0cm"> <p class="90" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: .45pt;margin-left:1.0pt;text-align:center;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 329.5pt;mso-element-frame-height:26.25pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:145.8pt;mso-element-top: 373.05pt;mso-height-rule:exactly"><span class="90pt">表</span><span class="910pt"><span lang="EN-US">6.6</span></span><span class="90pt">优化床身纵筋板厚度分析结果</span></p> <p class="MsoNormal" style="line-height:10.0pt;mso-line-height-rule:exactly; mso-element:frame;mso-element-frame-width:329.5pt;mso-element-frame-height: 26.25pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:145.8pt;mso-element-top:373.05pt;mso-height-rule:exactly"><span class="460"><span lang="EN-US" style="font-size:9.0pt">Table 6.6 Optimization of machine bed vertical plate thickness analysis results</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> </tr> </tbody> </table> <!--[if !supportTextWrap]--><br clear="ALL" /> <!--[endif]--></div> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse;mso-table-layout-alt:fixed;mso-table-overlap: never;mso-padding-alt:0cm .5pt 0cm .5pt"> <tbody> <tr style="mso-yfti-irow:0;mso-yfti-firstrow:yes;height:19.7pt;mso-height-rule: exactly"> <td width="82" style="width: 61.7pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm 0.5pt; height: 19.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:9.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="3389pt">筋板厚度</span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="108" style="width: 80.9pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm 0.5pt; height: 19.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="3389pt">质量</span><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">/t</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="185" style="width: 138.7pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm 0.5pt; height: 19.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:9.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="3389pt">静动态特性</span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="102" style="width: 76.3pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm 0.5pt; height: 19.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="MsoNormal" align="center" style="text-align:center;mso-element:frame; mso-element-frame-width:357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap: none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal:page; mso-element-left:119.4pt;mso-element-top:405.95pt"><span style="font-size: 9.0pt"> </span></p> </td> </tr> <tr style="mso-yfti-irow:1;height:17.75pt;mso-height-rule:exactly"> <td width="82" style="width: 61.7pt; padding: 0cm 0.5pt; height: 17.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:35.0pt; margin-bottom:0cm;margin-left:0cm;margin-bottom:.0001pt;text-align:center; text-indent:0cm;line-height:10.0pt;mso-line-height-rule:exactly;background: transparent;mso-element:frame;mso-element-frame-width:357.6pt;mso-element-frame-height: 121.9pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:119.4pt;mso-element-top:405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">/mm</span></span><span style="font-size: 9.0pt"><o:p></o:p></span></p> </td> <td width="108" style="width: 80.9pt; padding: 0cm 0.5pt; height: 17.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="MsoNormal" align="center" style="text-align:center;mso-element:frame; mso-element-frame-width:357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap: none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal:page; mso-element-left:119.4pt;mso-element-top:405.95pt"><span style="font-size: 9.0pt"> </span></p> </td> <td width="185" style="width: 138.7pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm 0.5pt; height: 17.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="3389pt">静力变形</span><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">/Hm</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="102" style="width: 76.3pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm 0.5pt; height: 17.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="3389pt">第一阶频率</span><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">f/Hz</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> </tr> <tr style="mso-yfti-irow:2;height:18.0pt;mso-height-rule:exactly"> <td width="82" style="width: 61.7pt; padding: 0cm 0.5pt; height: 18pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:35.0pt; margin-bottom:0cm;margin-left:0cm;margin-bottom:.0001pt;text-align:center; text-indent:0cm;line-height:10.0pt;mso-line-height-rule:exactly;background: transparent;mso-element:frame;mso-element-frame-width:357.6pt;mso-element-frame-height: 121.9pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:119.4pt;mso-element-top:405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">26</span></span><span style="font-size: 9.0pt"><o:p></o:p></span></p> </td> <td width="108" style="width: 80.9pt; padding: 0cm 0.5pt; height: 18pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: 0cm;margin-left:21.0pt;margin-bottom:.0001pt;text-align:center;text-indent: 0cm;line-height:10.0pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:357.6pt;mso-element-frame-height: 121.9pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:119.4pt;mso-element-top:405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">8.176</span></span><span style="font-size: 9.0pt"><o:p></o:p></span></p> </td> <td width="185" style="width: 138.7pt; padding: 0cm 0.5pt; height: 18pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">13.90</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="102" style="width: 76.3pt; padding: 0cm 0.5pt; height: 18pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">215.56</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> </tr> <tr style="mso-yfti-irow:3;height:18.0pt;mso-height-rule:exactly"> <td width="82" style="width: 61.7pt; padding: 0cm 0.5pt; height: 18pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:35.0pt; margin-bottom:0cm;margin-left:0cm;margin-bottom:.0001pt;text-align:center; text-indent:0cm;line-height:10.0pt;mso-line-height-rule:exactly;background: transparent;mso-element:frame;mso-element-frame-width:357.6pt;mso-element-frame-height: 121.9pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:119.4pt;mso-element-top:405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">28</span></span><span style="font-size: 9.0pt"><o:p></o:p></span></p> </td> <td width="108" style="width: 80.9pt; padding: 0cm 0.5pt; height: 18pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: 0cm;margin-left:21.0pt;margin-bottom:.0001pt;text-align:center;text-indent: 0cm;line-height:10.0pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:357.6pt;mso-element-frame-height: 121.9pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:119.4pt;mso-element-top:405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">8.220</span></span><span style="font-size: 9.0pt"><o:p></o:p></span></p> </td> <td width="185" style="width: 138.7pt; padding: 0cm 0.5pt; height: 18pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">13.11</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="102" style="width: 76.3pt; padding: 0cm 0.5pt; height: 18pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">217.18</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> </tr> <tr style="mso-yfti-irow:4;height:17.75pt;mso-height-rule:exactly"> <td width="82" style="width: 61.7pt; padding: 0cm 0.5pt; height: 17.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:35.0pt; margin-bottom:0cm;margin-left:0cm;margin-bottom:.0001pt;text-align:center; text-indent:0cm;line-height:10.0pt;mso-line-height-rule:exactly;background: transparent;mso-element:frame;mso-element-frame-width:357.6pt;mso-element-frame-height: 121.9pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:119.4pt;mso-element-top:405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">30</span></span><span style="font-size: 9.0pt"><o:p></o:p></span></p> </td> <td width="108" style="width: 80.9pt; padding: 0cm 0.5pt; height: 17.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: 0cm;margin-left:21.0pt;margin-bottom:.0001pt;text-align:center;text-indent: 0cm;line-height:10.0pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:357.6pt;mso-element-frame-height: 121.9pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:119.4pt;mso-element-top:405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">8.262</span></span><span style="font-size: 9.0pt"><o:p></o:p></span></p> </td> <td width="185" style="width: 138.7pt; padding: 0cm 0.5pt; height: 17.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">12.70</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="102" style="width: 76.3pt; padding: 0cm 0.5pt; height: 17.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">219.26</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> </tr> <tr style="mso-yfti-irow:5;height:18.0pt;mso-height-rule:exactly"> <td width="82" style="width: 61.7pt; padding: 0cm 0.5pt; height: 18pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:35.0pt; margin-bottom:0cm;margin-left:0cm;margin-bottom:.0001pt;text-align:center; text-indent:0cm;line-height:10.0pt;mso-line-height-rule:exactly;background: transparent;mso-element:frame;mso-element-frame-width:357.6pt;mso-element-frame-height: 121.9pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:119.4pt;mso-element-top:405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">32</span></span><span style="font-size: 9.0pt"><o:p></o:p></span></p> </td> <td width="108" style="width: 80.9pt; padding: 0cm 0.5pt; height: 18pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: 0cm;margin-left:21.0pt;margin-bottom:.0001pt;text-align:center;text-indent: 0cm;line-height:10.0pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:357.6pt;mso-element-frame-height: 121.9pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:119.4pt;mso-element-top:405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">8.308</span></span><span style="font-size: 9.0pt"><o:p></o:p></span></p> </td> <td width="185" style="width: 138.7pt; padding: 0cm 0.5pt; height: 18pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">12.56</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="102" style="width: 76.3pt; padding: 0cm 0.5pt; height: 18pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">218.18</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> </tr> <tr style="mso-yfti-irow:6;mso-yfti-lastrow:yes;height:12.7pt;mso-height-rule: exactly"> <td width="82" style="width: 61.7pt; 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="3380" align="center" style="margin-top:0cm;margin-right:35.0pt; margin-bottom:0cm;margin-left:0cm;margin-bottom:.0001pt;text-align:center; text-indent:0cm;line-height:10.0pt;mso-line-height-rule:exactly;background: transparent;mso-element:frame;mso-element-frame-width:357.6pt;mso-element-frame-height: 121.9pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:119.4pt;mso-element-top:405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">34</span></span><span style="font-size: 9.0pt"><o:p></o:p></span></p> </td> <td width="108" style="width: 80.9pt; 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="3380" align="center" style="margin-top:0cm;margin-right:0cm;margin-bottom: 0cm;margin-left:21.0pt;margin-bottom:.0001pt;text-align:center;text-indent: 0cm;line-height:10.0pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:357.6pt;mso-element-frame-height: 121.9pt;mso-element-wrap:none;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:119.4pt;mso-element-top:405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">8.366</span></span><span style="font-size: 9.0pt"><o:p></o:p></span></p> </td> <td width="185" style="width: 138.7pt; 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="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">12.46</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> <td width="102" style="width: 76.3pt; 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="3380" align="center" style="margin:0cm;margin-bottom:.0001pt; text-align:center;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 357.6pt;mso-element-frame-height:121.9pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:119.4pt;mso-element-top: 405.95pt"><span class="338-1pt"><span lang="EN-US" style="font-size:9.0pt">218.30</span></span><span style="font-size:9.0pt"><o:p></o:p></span></p> </td> </tr> </tbody> </table> <p>由表6.7和图6.13可以看出，增加横筋板的厚度可以提高床身的静刚度，a横筋板厚度大于22mm后，床身的静力变形量变化缓慢；增加横筋板厚度对床身低阶阵型频率的提升比较显著，当筋板增加到22mm后，床身低阶阵型频率几乎没有变化，因此，最终选取横筋板厚度为22mm。提升反而下降，因此，最终选取纵筋板厚度为30mm。<br /> 2、优化二：优化横筋板厚度<br /> 对床身的横向筋板厚度进行优化，初始设计的横筋板厚度为20mm，选取不同 横筋板厚度所对应的床身特性如表6.7所示，图6.13为各筋板厚度对结构的静力 变形和低阶阵型频率的灵敏度示意图。<br /> 6.4本章小结<br /> 本章针对复合式镗铣加工中心床身结构进行设计与优化，首先根据加工中心 的技术要求确定床身长、宽、高的基本尺寸，然后建立了三种不同筋板布置型式 的床身结构，通过有限元分析的方法比较了筋板布置型式以及筋板厚度变化对床 身质量以及静动态特性的影响，最后基于床身综合性能的层次分析法与筋板厚度 的灵敏度分析，得出筋板的最优布局形式与筋板的最佳厚度，研究表明：机床床 身“井”字型筋板布局已经具有良好的静动态特性，合理地选择筋板型式以及筋 板厚度尺寸是提高床身静动态特性的一种重要手段。</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 --> 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备注：为保证文章的完整度，本文核心内容由PDF格式显示，如未有显示请刷新或转换浏览器尝试，手机浏览可能无法正常使用！本文摘要：通过对混联五轴加工中心自适应深度学习控制方法的 研 究，可 知 此 方 法 的 创 新 之 处 在 于：１）建 立 了 机 床 的 运 动 学 … <a href="/bethel/5-aix/show-2965.html" target="_blank">[了解更多]</a></p> </div> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>05</span> <p>2024-11</p> </div> <h4><a title="五轴加工中心和五轴钻攻中心在机测量探头补偿" href="/bethel/5-aix/show-2959.html" target="_blank">五轴加工中心和五轴钻攻中心在机测量探头补</a></h4> <p>在机测量技术由于其成本低、检测效率高、无需二次装夹等优势被广泛用于零件加工测量当中，使得五轴加工中心和五轴钻攻中心，同时又兼具测量功能。在机测量系统的构成如图1所示，硬件部分主要是由高精度探头、信号接收器、机床整个本体，软件部分由机床控制系统、测量软件等组成[8]。待零件加工完成… <a href="/bethel/5-aix/show-2959.html" target="_blank">[了解更多]</a></p> </div> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>05</span> <p>2024-11</p> </div> <h4><a title="五轴加工中心进给系统动态误差影响因素" href="/bethel/5-aix/show-2958.html" target="_blank">五轴加工中心进给系统动态误差影响因素</a></h4> 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