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<li><a title="數(shù)控文章" href="/bethel/news">數(shù)控文章</a></li> </ol> </nav> </div> <!--/sub_menu--><!-- 面包屑導(dǎo)航結(jié)束 --> <!-- 頁面標(biāo)題開始 --> <div id="n1l1njb9b" class="title"> <h3><a>龍門加工中心橫梁系統(tǒng)動態(tài)特性研究<small></small></a></h3> </div> <!-- 頁面標(biāo)題結(jié)束 --> <hr class="featurette-divider"> <!-- 中部開始 --> <div id="n1l1njb9b" class="container"> <!-- 正文 --> <div id="n1l1njb9b" class="lead" id="print"> <p> </p> <div> <table cellspacing="0" cellpadding="0" hspace="0" vspace="0" width="595" height="843"> <tbody> <tr> <td valign="top" align="left" height="843" style="padding-top:0cm;padding-right: 0cm;padding-bottom:0cm;padding-left:0cm"> <p class="250" style="text-align:justify;text-justify:inter-ideograph; text-indent:25.0pt;line-height:23.3pt;mso-line-height-rule:exactly; background:transparent;mso-element:frame;mso-element-frame-width:446.15pt; mso-element-frame-height:632.0pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:83.0pt;mso-element-top: 134.2pt;mso-height-rule:exactly"><span id="n1l1njb9b" class="250pt">機(jī)床的靜態(tài)特性只能反映把所受到力作為靜力考慮時機(jī)床抵抗變形的能力，但 是，為了適應(yīng)機(jī)床的高速化，智能化發(fā)展，僅僅研宄它的靜剛度是遠(yuǎn)遠(yuǎn)不夠的。機(jī) 床是一個彈性系統(tǒng)，在一定條件下，例如受外界切削力變化及機(jī)床本身不平衡旋轉(zhuǎn) 部件產(chǎn)生的慣性激振力的作用會使機(jī)床產(chǎn)生劇烈的振動<sup>[33]</sup>。在工作狀況下，如果龍 門機(jī)床產(chǎn)生的振幅超過一定的值，將嚴(yán)重影響加工質(zhì)量，增加刀具磨損和噪音，從 而降低加工精度和生產(chǎn)效率，甚至在嚴(yán)重的情況下機(jī)床將不能正常工作<sup>[34]</sup>。因此， 十分有必要對機(jī)床的動態(tài)特性進(jìn)行研宄。機(jī)床動態(tài)性能分析主要包括自激振動研宄， 結(jié)構(gòu)動態(tài)特性的研宄和動態(tài)性能測試研宄。其中橫梁系統(tǒng)是龍門機(jī)床系統(tǒng)的主要承 載部件，在實際工況下加工時，橫梁系統(tǒng)與機(jī)床多個重要部件接觸，承載著極為復(fù) 雜的載荷，研宄其動態(tài)特性對提高機(jī)床的整機(jī)性能具有重要的作用。</span></p> <p class="250" style="margin-bottom:2.85pt;text-align:justify;text-justify: inter-ideograph;text-indent:25.0pt;line-height:23.3pt;mso-line-height-rule: exactly;background:transparent;mso-element:frame;mso-element-frame-width: 446.15pt;mso-element-frame-height:632.0pt;mso-element-wrap:none;mso-element-anchor-vertical: page;mso-element-anchor-horizontal:page;mso-element-left:83.0pt;mso-element-top: 134.2pt;mso-height-rule:exactly"><span id="n1l1njb9b" class="250pt">橫梁系統(tǒng)的動態(tài)性能研宄的終極目標(biāo)是提高橫梁系統(tǒng)的加工過程中的動態(tài)效率 和動態(tài)精度。橫梁系統(tǒng)的動態(tài)性能主要指的是橫梁系統(tǒng)的振動性能，即橫梁系統(tǒng)抵 抗振動的能力。在多數(shù)情況下，橫梁系統(tǒng)的振動是有害的，為了保證加工質(zhì)量，提 高切削效率，減少刀具磨損、降低噪音都希望盡可能減小和消除振動，也就是提高 橫梁系統(tǒng)抵抗受迫振動和自激振動的能力，使橫梁系統(tǒng)的振動量控制在滿足加工性 能所允許的范圍之內(nèi)<sup>[35]</sup>。對橫梁系統(tǒng)的有限元模型進(jìn)行模態(tài)分析，可以得到振動系 統(tǒng)的固有頻率和振型，一方面避免系統(tǒng)工作時發(fā)生共振，另一方面是為系統(tǒng)作進(jìn)一 步的動力分析打下基礎(chǔ)，因此計算橫梁系統(tǒng)的固有頻率和各階振型，將其固有頻率 控制在一定的范圍之內(nèi)是很有必要的<sup>[36]</sup>。本章對橫梁系統(tǒng)進(jìn)行模態(tài)分析，綜合考查 其動態(tài)性能。</span></p> </td> </tr> </tbody> </table> </div> <!--[if !supportTextWrap]--> <p><br clear="ALL" /> <!--[endif]--></p></div> <div id="n1l1njb9b" class="blank30"></div> <!-- tag --> <div id="n1l1njb9b" class="blank10"></div> 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