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href="/bethel/news">數(shù)控文章</a></li> </ol> </nav> </div> <!--/sub_menu--><!-- 面包屑導航結(jié)束 --> <!-- 頁面標題開始 --> <div id="n1l1njb9b" class="title"> <h3><a>滾珠絲杠副的傳熱理論<small></small></a></h3> </div> <!-- 頁面標題結(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> <span style="font-family: 宋體; font-size: 10.5pt; letter-spacing: 2pt; line-height: 14pt; text-indent: 0pt;">第二章空心滾珠絲杠的熱特性理論研宄</span></p> <p class="NewStyle53" style="margin: 0pt 278pt 0pt 0pt; text-indent: 0pt; page-break-after: avoid; line-height: 29.75pt;"><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">2.1</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">滾珠絲杠副的傳熱理論</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle53" style="margin: 0pt 278pt 0pt 0pt; text-indent: 0pt; page-break-after: avoid; line-height: 29.75pt;"><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"> </span><span id="n1l1njb9b" class="20" style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">2.1.1</span><span id="n1l1njb9b" class="20" style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">熱傳導理論</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle49" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:25.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">當物體內(nèi)部溫度不均勻而出現(xiàn)溫度梯度時，熱量的移動方式稱為熱傳導。當固體 表面有流體流動時，由于固體表面與流體之間存在溫差，流體將熱量帶離高溫固體的 傳熱方式稱為熱對流。在本課題中采用冷卻杲通過減壓閥將冷卻液通入空心滾珠絲杠 伺服進給系統(tǒng)，是強迫對流傳熱的過程，并將傳熱系數(shù)及對流換熱系數(shù)設定為常數(shù)。 熱輻射的加工中心傳遞熱量的方式主要是熱對流與熱傳導，輻射傳熱的熱量只占總傳 熱量極少的部分，一般情況下，熱輻射在實驗室中專門用于實驗的目地研宄數(shù)控機床 的溫度特性時才會被考慮到。機床產(chǎn)生的熱量在接觸的各部件單元間傳遞是熱傳導過 程，從機床外壁傳遞到車間環(huán)境中是通過對流換熱和輻射換熱的方式，但在相對穩(wěn)定 的機床工作環(huán)境下，熱輻射方式對機床整體傳熱過程的影響遠遠小于熱傳導方式與熱 對流方式，所以在此不予考慮。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle49" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:25.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">在某一時刻將物體內(nèi)的溫度相同的點連接成線或面叫做等溫線或等溫面。不同溫 度的等溫線或等溫面永不相交，正是由于不同等溫面之間的溫度差導致熱量的傳遞， 所以溫度差是能量傳遞的動力。等溫面法向方向的溫度變化率叫做溫度梯度。用于表</span></p> <p class="NewStyle49" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:25.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">示溫度變化的陡緩程度。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle49" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:24.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">根據(jù)熱力學第一定律和傅里葉定律可以建立溫度場的導熱微分方程。傅立葉定律 表明了熱流密度與溫度梯度之間的線性關(guān)系，然而要求出熱流密度的大小，仍要進一 步得到物體內(nèi)部的溫度分布，這就必須要建立起導熱微分方程。當然，溫度分布應滿 足一定的邊界條件，初始條件。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle49" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:25.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">第三類邊界條件表明固體邊界熱流密度與固體和流體之間的溫度差成正比，實質(zhì) 上是</span><span id="n1l1njb9b" class="32" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">Robin</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">條件的一種表現(xiàn)形式。結(jié)合本課題，流體溫度和換熱系數(shù)設置為常數(shù)，特 殊情況下可以是溫度、時間、與位置的某種函數(shù)。換熱系數(shù)與流體物性、流動速度、 流體和固體之間的溫度差等因素相關(guān)，多數(shù)情況下需要采用實驗方法測定。</span></p> <p class="NewStyle49" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:25.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "> </p> <p class="NewStyle49" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:25.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "> </p> <p class="NewStyle49" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:25.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-size:9.0pt;font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman";mso-bidi-font-family: "Times New Roman";mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA">本文采摘自“空心滾珠絲杠在數(shù)控機床伺服進給系統(tǒng)中的應用研究”，因為編輯困難導致有些函數(shù)、表格、圖片、內(nèi)容無法顯示，有需要者可以在網(wǎng)絡中查找相關(guān)文章！本文由伯特利數(shù)控整理發(fā)表文章均來自網(wǎng)絡僅供學習參考，轉(zhuǎn)載請注明！</span></p> <p class="NewStyle49" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:25.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p></div> <div id="n1l1njb9b" class="blank30"></div> <!-- tag --> <div id="n1l1njb9b" class="blank10"></div> 標簽： <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> <a href='/index.php?case=tag&act=show&tag=%E6%95%B0%E6%8E%A7%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>數(shù)控加工中心</a> <a href='/index.php?case=tag&act=show&tag=CNC%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>CNC加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E6%95%B0%E6%8E%A7%E6%9C%BA%E5%BA%8A' target='_blank'>數(shù)控機床</a> <a href='/index.php?case=tag&act=show&tag=%E6%BB%9A%E7%8F%A0%E4%B8%9D%E6%9D%86' target='_blank'>滾珠絲桿</a> <!-- 分類 --> <div id="n1l1njb9b" class="blank10"></div> 分類： <a href='/bethel/type/jnc/type-1.html' target='_blank'>加工中心</a> <div id="n1l1njb9b" class="blank30"></div> <!--自動調(diào)用自定義字段--> <div id="n1l1njb9b" class="blank20"></div> <div id="n1l1njb9b" class="blank30"></div> <!-- 投票 --> <script src="/index.php?case=vote&act=view&aid=1008"></script> <!-- 自定義表單開始 --> <!-- 自定義表單結(jié)束 --> <div id="n1l1njb9b" class="blank60"></div> <!-- 上下頁開始 --> <div class="n1l1njb9b" id="page"> <strong>上一篇</strong><a href="/bethel/news/show_1007.html">空心滾珠絲杠在數(shù)控機床伺服進給系統(tǒng)中的應用研究的內(nèi)容及意義</a> <div id="n1l1njb9b" class="blank10"></div> 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