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</noscript> <script> function stop(){ return false; } document.oncontextmenu=stop; </script> <!-- nav --> <nav class="navbar navbar-default navbar-fixed-top"> <div class="container"> <div class="navbar-header"> <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar"> <span class="sr-only">高速雕銑機_精雕機_石墨機_加工中心_鉆攻中心-宇匠數控</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <div class="top-nav-right navbar-right"> <ul> <li id="fat-menu" class="dropdown"> <a class="dropdown-toggleglyphicon glyphicon glyphicon-globe" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"></a> <ul class="dropdown-menu" aria-labelledby="drop3"> <li><a id="StranLink" name="StranLink">繁體</a></li><li><a href="http://www.www.htspipe.com.cn/" target="_blank">公司網站</a></li> </ul> </li> <li class="glyphicon glyphicon-search" data-toggle="modal" 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bodyBgs[2] = "/images/banner/s3.jpg"; bodyBgs[3] = "/images/banner/s4.jpg"; bodyBgs[4] = "/images/banner/s5.jpg"; var randomBgIndex = Math.round( Math.random() * 4 ); //輸出隨機的背景圖 document.write('<style>.banner{background:url(' + bodyBgs[randomBgIndex] + ') no-repeat 50% bottom}</style>'); //]]> </script> <section> <div class="banner" style="height:160px;"> </div> </section> <!-- 面包屑導航開始 --> <div class="container "> <nav class="sub_menu"> <ol class="breadcrumb"><span class="glyphicon glyphicon-list"></span> <li><a href="/">網站首頁</a></li> <li><a title="數控文章" href="/bethel/news">數控文章</a></li> </ol> </nav> </div> <!--/sub_menu--><!-- 面包屑導航結束 --> <!-- 頁面標題開始 --> <div class="title"> <h3><a>龍門五軸加工中心薄弱環節的改進設計<small></small></a></h3> </div> <!-- 頁面標題結束 --> <hr class="featurette-divider"> <!-- 中部開始 --> <div class="container"> <!-- 正文 --> <div class="lead" id="print"> <p><span style="font-size: small;"> <span class="20pt" style="line-height: 14.4pt; text-indent: 0cm; background-color: transparent;"><span style="font-family: SimSun;">0</span></span><span class="20pt" style="line-height: 14.4pt; text-indent: 0cm; background-color: transparent;">前言</span> </span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:22.0pt;line-height:14.4pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: small;"><span class="20pt"><a href='http://www.www.htspipe.com.cn/' target='_blank'>龍門</a>五軸<a href='http://www.www.htspipe.com.cn/' target='_blank'>加工中心</a>可以通過五軸控制實現對任意 方向孔及復雜型面進行加工，能滿足加工范圍大能力 強的需求，廣泛應用于航空航天、模具、汽車等需要 高精度加工的領域。而保證<a href='http://www.www.htspipe.com.cn/' target='_blank'>機床</a>結構有良好的動靜態 特性是獲得高精度加工的前提基礎<sup>1</sup>。從已有的研究 來看，史科科等<sup>2</sup>對某型臥式<a href='http://www.www.htspipe.com.cn/' target='_blank'>機床</a>進行了動靜態特性 分析；周新建等<sup>3</sup>是對立式<a href='http://www.www.htspipe.com.cn/' target='_blank'>加工中心</a>進行的整機動靜 態特性分析；李焱等人</span></span><span class="20pt"><a href="file:///E:/%E7%BD%91%E7%AB%99%E5%8D%95%E7%8B%AC%E8%B5%84%E6%96%99/%E5%9B%BE%E4%B9%A6/2015%E6%96%B0%E5%9B%BE%E4%B9%A6/%E6%9C%9F%E5%88%8Adoc/%E9%BE%99%E9%97%A8%E4%BA%94%E8%BD%B4%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83%E8%96%84%E5%BC%B1%E7%8E%AF%E8%8A%82%E7%9A%84%E6%94%B9%E8%BF%9B%E8%AE%BE%E8%AE%A1_%E5%8C%85%E4%B8%BD.doc#_ftn1" name="_ftnref1" title=""><span style="font-size: small;"><sup><!--[if !supportFootnotes]--><span class="20pt"><sup><span style="color: black;">[1]</span></sup></span><!--[endif]--></sup></span></a></span><span style="font-size: small;"><span class="20pt">分析了龍門加工中的靜剛度 并對結構進行優化。本文作者以某型龍門五軸加工中 心整機為研究對象，運用有限元技術分析其動靜態特 性并找出其薄弱部位</span><span class="20pt">一</span><span class="20pt">橫梁；改進其結構后并通過 實驗驗證了改進設計的有效性。</span></span></p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 14.4pt; background: transparent;"><span style="font-size: small;"><span class="20pt">1整機靜態特性分析</span></span></p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 14.4pt; background: transparent;"><span style="font-size: small;"><span class="20pt"><span style="font-family: SimSun;">1.1</span></span><span class="20pt">靜力學分析</span></span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:22.0pt;line-height:14.4pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: small;"><span class="20pt">國產的某型龍門五軸<a href='http://www.www.htspipe.com.cn/' target='_blank'>加工中心</a>由床身、立柱、橫 梁、主軸箱、工作臺和雙擺頭等部件組成，如圖1所 示。由于<a href='http://www.www.htspipe.com.cn/' target='_blank'>龍門加工中心</a>幾何結構復雜，在建立有限元 模型時，不可能考慮所有細微復雜的幾何因素，因此 只考慮</span><span class="20pt">一</span><span class="20pt">些起主導作用的因素來建立整機的簡化模 型。采用</span><span class="2Georgia"><span lang="EN-US">Pro/E</span></span><span class="20pt">軟件先將各部件建立三維實體模型并 裝配得到整機模型，導入</span><span class="2Georgia"><span lang="EN-US">ANSYS</span></span><span class="20pt">的</span><span class="2Georgia"><span lang="EN-US">Workbench</span></span><span class="20pt">應用 平臺，設置機床的材料屬性。其中立柱的材料為 </span><span class="2Georgia"><span lang="EN-US">HT</span></span><span class="20pt"><span style="font-family: SimSun;">250</span></span><span class="20pt">，</span><span class="20pt">彈性模量為</span><span class="20pt"><span style="font-family: SimSun;">1. </span></span><span class="20pt">2 </span><span class="2Georgia"><span lang="EN-US">x</span></span><span class="20pt"><span style="font-family: SimSun;">10<sup>5</sup> </span></span><span class="2Georgia"><span lang="EN-US">MPa</span></span><span class="20pt">，</span><span class="20pt">密度為7 210 </span><span class="2Georgia"><span lang="EN-US">kg</span></span><span class="20pt"><span style="font-family: SimSun;">/ </span></span><span class="2Georgia"><span lang="EN-US">m</span></span><span class="20pt"><sup><span style="font-family: SimSun;">3</span></sup></span><span class="20pt">，</span><span class="20pt">泊松比</span><span class="20pt"><span style="font-family: SimSun;">0.22;</span></span><span class="20pt">橫梁等其他大件用</span><span class="2Georgia"><span lang="EN-US">Q</span></span><span class="20pt"><span style="font-family: SimSun;">235</span></span><span class="2Georgia"><span lang="EN-US">A</span></span><span class="20pt">，</span><span class="20pt">彈性 模量為</span><span class="20pt"><span style="font-family: SimSun;">2. </span></span><span class="20pt">1 </span><span class="2Georgia"><span lang="EN-US">x</span></span><span class="20pt"><span lang="EN-US" style="font-family: SimSun;"> </span></span><span class="20pt">10<sup>5</sup> </span><span class="2Georgia"><span lang="EN-US">MPa</span></span><span class="20pt">，</span><span class="20pt">密度為7 860 </span><span class="2Georgia"><span lang="EN-US">kg/m</span></span><span class="20pt"><sup><span style="font-family: SimSun;">3</span></sup></span><span class="20pt">，</span><span class="20pt">泊松比 0.3。進行網格劃分時，采用</span><span class="2Georgia"><span lang="EN-US">SOLID</span></span><span class="20pt"><span lang="EN-US" style="font-family: SimSun;"> </span></span><span class="20pt">45單元對實體進 行網格劃分，由于結合部的剛度特性對整機的靜剛度 有重大影響，因此采用用戶自定義單元來模擬結合 部。機床結合部包括直線電機初級-次級、直線滾動 導軌滑塊-軌道、滾珠絲杠絲母-絲杠和螺栓。用戶 自定義單元用空間任意兩個節點來定義，每個節點有 6個自由度個自定義單元中有兩個節點就有12 個自由度，就需要用12 </span><span class="2Georgia"><span lang="EN-US">x</span></span><span class="20pt"><span lang="EN-US" style="font-family: SimSun;"> </span></span><span class="20pt">12階的矩陣來完全定義該 單元的剛度、阻尼或質量信息</span><span class="2Georgia"><sup>0</sup></span><span class="20pt">。用戶自定義單元的 實常數需要給一個</span><span class="20pt"><span style="font-family: SimSun;">12</span></span><span class="2Georgia"><span lang="EN-US">x</span></span><span class="20pt"><span style="font-family: SimSun;">12</span></span><span class="20pt">的矩陣中的元素分別賦值, </span><br /> </span></p> <p><span style="font-size: small;"> <!--[endif]--> </span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:24.0pt;line-height:14.0pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: small;"><span class="20pt">靜剛度作為衡量機床性能優劣的重要指標，對于 <a href='http://www.www.htspipe.com.cn/' target='_blank'>龍門加工中心</a>來說，它自身的重力對機床的變形和加 工精度有著重要的影響</span><span class="2Georgia"><sup>6</sup></span><span class="20pt">。計算機床在重力作用下的 變形情況，結果如圖3所示。工件上的最大變形為 </span><span class="20pt"><span style="font-family: SimSun;">0. </span></span><span class="20pt">039 </span><span class="2Georgia"><span lang="EN-US">mm</span></span><span class="20pt"><span style="font-family: SimSun;">,</span></span><span class="20pt">主軸上端面的變形為</span><span class="20pt"><span style="font-family: SimSun;">0. </span></span><span class="20pt">197 </span><span class="2Georgia"><span lang="EN-US">mm</span></span><span class="20pt">。</span></span></p> <div><span style="font-size: small;"><br /> </span></div> <p><span style="font-size: small;"><!--[if !supportTextWrap]--> <!--[endif]--> <span class="20pt"> 在整機有限元模型中，按照實際工況設置邊界約 束條件，將床身地腳孔內圓柱面作為固定約束。分別 在主軸端面和工件的對應面上施加</span><span class="2Georgia"><span lang="EN-US">x</span></span><span class="20pt">、</span><span class="2Georgia"><span lang="EN-US">y</span></span><span class="20pt">、</span><span class="2Georgia"><span lang="EN-US">z</span></span><span class="20pt">三個方 向，大小為5 000 </span><span class="2Georgia"><span lang="EN-US">N</span></span><span class="20pt">的力。以</span><span class="2Georgia"><span lang="EN-US">x</span></span><span class="20pt">向靜剛度為例，得到 的整機的變形情況如圖4, 3個方向的靜剛度對比結 果見表1。由表1可知，機床在</span><span class="2Georgia"><span lang="EN-US">y</span></span><span class="20pt">方向上變形量最大, 剛度最小。</span></span></p> <p class="a0" style="line-height: 14.25pt; background: transparent;"><span style="font-size: small;"><span class="0pt"><span style="font-family: SimSun;">1.3</span></span><span class="0pt">查找整機薄弱環節</span></span></p> <p> </p> <p class="a0" style="text-align: justify; line-height: 14.25pt; background: transparent;"><span style="font-size: small;"><span class="0pt"> 為找出機床的薄弱部件，根據文獻</span><span class="0pt"><span style="font-family: SimSun;">7],</span></span><span class="0pt">利用 <a href='http://www.www.htspipe.com.cn/' target='_blank'>數控機床</a>串聯剛場理論，結合其串聯剛度圖譜分析出 各部件變形占整機位移量的比例見圖5。由于整機是 —個機床一刀具一工件組成的串聯系統，系統剛性低</span><span class="20pt" style="line-height: 14.3pt; text-indent: 0cm; background-color: transparent;">于整機中剛性最低的部件。由圖5分析各部件對系統 剛性的影響，找出薄弱環節，進而提高整機剛度。由 圖5可知，橫梁在</span><span class="2Georgia" style="line-height: 14.3pt; text-indent: 0cm; background-color: transparent;"><span lang="EN-US">y</span></span><span class="20pt" style="line-height: 14.3pt; text-indent: 0cm; background-color: transparent;">方向上變形量較大，占到整體工 藝變形比率高達40%以上，導致</span><span class="2Georgia" style="line-height: 14.3pt; text-indent: 0cm; background-color: transparent;"><span lang="EN-US">y</span></span><span class="20pt" style="line-height: 14.3pt; text-indent: 0cm; background-color: transparent;">向剛度相對較低。 分析其原因可能為：橫梁的剛度不足；立柱繞</span><span class="2Georgia" style="line-height: 14.3pt; text-indent: 0cm; background-color: transparent;"><span lang="EN-US">y</span></span><span class="20pt" style="line-height: 14.3pt; text-indent: 0cm; background-color: transparent;">軸抗 彎剛度不足；主軸箱系統的剛度較低。</span></span></p> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 14.5pt; background: transparent;"><span style="font-size: small;"><span class="20pt">2動態特性分析</span></span></p> <p class="a0" style="text-align: justify; line-height: 14.25pt; background: transparent;"><span style="font-size: small;"> <span class="20pt"> 模態分析作為研究結構動力分析的基礎，解決 了結構動力分析中的一個重要問題即進行結構的固 有振動特性分析<sup>8</sup>。通過模態分析計算出結構的固 有振動特性后，可以為系統的振動故障診斷、預報 以及結構動力特性的優化設計提供依據。對機床底 部進行全約束，采用空間迭代法<sup>9</sup>提取模態，限于 篇幅，得到整機的前2階模態振型如圖6所示。前 四階模態及振型描述如表2。低階模態是影響機床 動態特性的主要因素</span><span class="2Georgia"><sup><span lang="EN-US">M</span></sup></span><span class="20pt">，由整機的前4階模態振型 可知，機床振動主要集中在立柱和橫梁上，與靜力 學分析相結合，說明橫梁是機床的薄弱環節，需要 進一步優化其結構。</span></span></p> <p class="a0" style="text-align: justify; background: transparent;"><span style="font-size: small;"><span style="line-height: 19px;">3 基于原結構的改進設計</span></span></p> <p class="a0" style="text-align: justify; background: transparent;"> </p> <p class="20" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:23.0pt;line-height:14.3pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: small;"><span class="20pt">由前面的分析可知，橫梁在</span><span class="2Georgia"><span lang="EN-US">y</span></span><span class="20pt">向的剛度不足，由 于其剛度是連續變化的，而橫梁中間沒有支撐點，其 柔度較大。為增加其在</span><span class="2Georgia"><span lang="EN-US">y</span></span><span class="20pt">向的抗彎剛度，考慮到需要 在原有橫梁的基礎上進行改進結構，因此提出3種改 進方案以便于進一步進行分析。原有橫梁結構沒有外 部任何突出部分，而3種方案如圖7。</span></span></p> <p class="20" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:23.0pt;line-height:14.3pt;mso-line-height-rule: exactly;background:transparent"> </p> <p class="20" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:22.0pt;line-height:14.5pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: small;"><span class="20pt">對改進后3種結構各部件進行有限元分析，得到 各部件在</span><span class="2Georgia"><span lang="EN-US">y</span></span><span class="20pt">向占整機變形量的比值如圖8?？砂l現橫 梁在整體系統中的變形比例已大大降低，各部件的變 形比例也愈發合理。其中改進結構3各部件變形量的 比例最為合理。因此以結構3有限元分析為基礎，進 行實際的結構改進。</span></span></p> <p class="20" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:22.0pt;line-height:14.5pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: small;"><span class="20pt">圖8結構改進前后各部件變形在系統變形的比例 對改進后整機進行動靜態特性分析，以改進 結構3為例，得到改進前后結構對比見表3。由此 看出，機床在</span><span class="2Georgia"><span lang="EN-US">x</span></span><span class="20pt"><span style="font-family: SimSun;">, </span></span><span class="2Georgia"><span lang="EN-US">y</span></span><span class="20pt"><span style="font-family: SimSun;">,</span></span><span class="2Georgia"><span lang="EN-US">z</span></span><span class="20pt">向靜剛度均有所增強，尤其 在原來薄弱的</span><span class="2Georgia"><span lang="EN-US">y</span></span><span class="20pt">向，增大了 </span><span class="20pt"><span style="font-family: SimSun;">24. </span></span><span class="20pt">3%,而且其低階 頻率均有所提高，其一階頻率提高了 </span><span class="20pt"><span style="font-family: SimSun;">18. </span></span><span class="20pt">8%。說 明改進結構后整機的動靜態特性均取得了較好的 效果。</span></span></p> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 14.4pt; background: transparent;"><span style="font-size: small;"><span class="20pt">4實驗測試結果與分析</span></span></p> <p class="20" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:22.0pt;line-height:14.5pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: small;"> </span></p> <p class="20" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:22.0pt;line-height:14.4pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: small;"><span class="20pt">為測量改進后橫梁結構實際變形量，與有限元分 析結果進行對比，進行了橫梁變形量的測量實驗，測 量現場如圖9。按照實際裝配情況將橫梁置于立柱 上，以工作臺水平為基準，將千分表放置于滑枕下, 以橫梁右端為起始點，得到結構改變前后</span><span class="2Georgia"><span lang="EN-US">y</span></span><span class="20pt">向位移變 化<sup>8]</sup>如圖10。從圖10發現，改進后結構與原始結構 相比，在</span><span class="2Georgia"><span lang="EN-US">y</span></span><span class="20pt">向的位移明顯下降，說明橫梁在</span><span class="2Georgia"><span lang="EN-US">y</span></span><span class="20pt">向變形 量減小，剛度增加。而且實驗測試結果與有限元分析 結果也基本相符。</span></span></p> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-align: justify; text-indent: 22pt; background: transparent;"><span style="font-size: small;"><span style="line-height: 19.2000007629395px;">5.結論</span></span></p> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-align: justify; text-indent: 22pt; background: transparent;"> </p> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-align: justify; text-indent: 22pt; background: transparent;"><span style="font-size: small;"><span style="line-height: 19.2000007629395px;">通過引用用戶自定義單元模擬加工中心的結合</span><span class="20pt">部，建立了龍門<a href='http://www.www.htspipe.com.cn/' target='_blank'>五軸加工中心</a>的有限元模型后對其3 個方向的靜剛度進行比較，發現其</span><span class="2Georgia"><span lang="EN-US">y</span></span><span class="20pt">向剛度薄弱。通 過對加工中心進行模態分析，與靜力學分析相結合找 到整機的薄弱部位</span><span class="20pt"><span lang="EN-US">一</span></span><span class="20pt">橫梁。在不改變原有橫梁的基 礎上，通過增加外部結構的方式對原有橫梁進行改進 設計并提出3種方案。通過比較發現結構3最為合 理。將改進后結構與原有結構通過有限元計算和實際 實驗測量的方式進行對比，發現計算結果和測量結果 基本吻合。通過改進橫梁結構，實現了提高整機動靜 態特性的目的。</span> ?原有橫梁結構沒有外 部任何突出部分，而3種方案如圖7。</span></p> <p> </p> <div> <p><span 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