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margin-left:0cm;text-align:justify;text-justify:inter-ideograph;line-height: 14.0pt;mso-line-height-rule:exactly;mso-pagination:lines-together;page-break-after: avoid;tab-stops:18.9pt;background:transparent"><!--[if gte vml 1]><v:shapetype id="_x0000_t202" coordsize="21600,21600" o:spt="202" path="m,l,21600r21600,l21600,xe"> <v:stroke joinstyle="miter" /> <v:path gradientshapeok="t" o:connecttype="rect" /> </v:shapetype><v:shape id="_x0000_s1026" type="#_x0000_t202" style='position:absolute; left:0;text-align:left;margin-left:196.8pt;margin-top:-40.05pt;width:16.8pt; height:11.25pt;z-index:-3;mso-wrap-distance-left:5pt; mso-wrap-distance-right:154.55pt;mso-position-horizontal-relative:margin' filled="f" stroked="f"> <v:textbox style='mso-fit-shape-to-text:t' inset="0,0,0,0"> <![if !mso]> <table cellpadding=0 cellspacing=0 width="100%"> <tr> <td><![endif]> <div> <p class=3 style='margin-bottom:0cm;margin-bottom:.0001pt;line-height:11.5pt; mso-line-height-rule:exactly;background:transparent'><span lang=EN-US><o:p> </o:p></span></p> </div> <![if !mso]></td> </tr> </table> <![endif]></v:textbox> <w:wrap type="square" side="right" anchorx="margin" /> </v:shape><![endif]--><!--[if !vml]--><img width="27" height="19" src="file:///E:/QQPCmgr/Temp/msohtml1/01/clip_image001.gif" align="left" hspace="107" style="margin-left:-100px;margin-right:100px" v:shapes="_x0000_s1026" alt="" /><!--[endif]--><a name="bookmark18"><span class="61pt">3.4轴承热传递分析</span></a><a name="bookmark18"></a><br clear="ALL" /> <span class="2"> </span></p> <p class="60" style="margin-top:0cm;margin-right:0cm;margin-bottom:10.15pt; margin-left:0cm;text-align:justify;text-justify:inter-ideograph;line-height: 14.0pt;mso-line-height-rule:exactly;mso-pagination:lines-together;page-break-after: avoid;tab-stops:18.9pt;background:transparent"><span class="2"> 角接触球轴承的热量传递发生在轴承、带轮与主轴之间。轴承的热能传递实际上 是三个方向传递问题，主轴为轴对称的回转体，径向力和力矩载荷可忽略不计，沿轴 承圆周向的热量不变，滚动体任意方向上的热传递模型相似。所以，可用简化的一维 模型表示滚动轴承热传递。<o:p></o:p></span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:26.0pt;line-height:23.3pt;mso-line-height-rule: exactly;background:transparent"><span class="2">图</span><span class="2"><span style="font-family: SimSun;">3.4</span></span><span class="2">中假定摩擦热只存在于轴承内外圈滚动与滚动体接触部位上。摩擦热转移 到接触部位上的比例分配可根据</span><span class="2TimesNewRoman"><span lang="EN-US">Burton</span></span><span class="2">和</span><span class="2TimesNewRoman"><span lang="EN-US">Steph</span></span><span class="2">的分析成果。认为有一半的热能转移 到滚动体，剩余的热能传递到内外圈<sup>[45]</sup>。</span><br clear="ALL" /> <span class="2"> 分析了主轴各个零件的热阻值，分析了其温度变化情况，可获得轴承热阻网络模 型，图</span><span class="2"><span style="font-family: SimSun;">3.5</span></span><span class="2">为轴承热阻网络模型。从图</span><span class="2"><span style="font-family: SimSun;">3.5</span></span><span class="2">可以比较直观地表述滚动轴承中热阻、温 度和热流的关系。轴承某一点热传递方程根据热阻网络，结合轴承润滑方式推导出来。<o:p></o:p></span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:27.0pt;line-height:26.9pt;mso-line-height-rule: exactly;background:transparent"><span class="2">对于油气润滑系统来说，滚动体与空气的热对流属于强迫对流换热；而对于普通 </span><span class="21pt">油润滑来说，滚动体与空气产生自然对流换热。由表</span><span class="21pt"><span style="font-family: SimSun;">3.3</span></span><span class="21pt">查得</span><span class="21pt"><span style="font-family: SimSun;">></span></span><span class="2TimesNewRoman"><span lang="EN-US">c</span></span><span class="21pt"><span style="font-family: SimSun;">^,</span></span><span class="21pt">所以根据 </span><span class="2">公式</span><span class="2">（</span><span class="2"><span style="font-family: SimSun;">3.44)</span></span><span class="2">和表</span><span class="2"><span style="font-family: SimSun;">3.3</span></span><span class="2">可得。</span></p> <p class="21" style="margin-top:3.7pt;margin-right:0cm;margin-bottom:0cm; margin-left:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:inter-ideograph; text-indent:26.0pt;line-height:23.3pt;mso-line-height-rule:exactly;background: transparent"><span class="2">根据上面的分析，我们可以清楚的知道，油气润滑与普通油润滑相比，可使轴承 的温升降低，有利于轴承的正常工作和使用寿命。</span></p> <p class="60" style="margin-top:0cm;margin-right:0cm;margin-bottom:10.4pt; margin-left:0cm;text-align:justify;text-justify:inter-ideograph;text-indent: 0cm;line-height:14.0pt;mso-line-height-rule:exactly;mso-pagination:lines-together; page-break-after:avoid;mso-list:l0 level1 lfo1;tab-stops:18.1pt;background: transparent"><a name="bookmark19"><!--[if !supportLists]--><span style="font-family: SimSun; letter-spacing: 1pt;">3.<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="61pt">5本章小结</span></a></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:26.0pt;line-height:23.3pt;mso-line-height-rule: exactly;background:transparent"><span class="2">本章介绍了引起轴承失效的几大原因，阐述了滚动轴承的摩擦热能产生机理，并 推导出滚动轴承热阻计算公式，提出热量计算公式。同时，根据传热学原理，得出 </span><span class="2TimesNewRoman"><span lang="EN-US">LXK</span></span><span class="2"><span style="font-family: SimSun;">300</span></span><span class="2TimesNewRoman"><span lang="EN-US">X</span></span><span class="2">数控旋风螺杆铣床主轴轴承的热传递方程，并且论证了油气润滑与普通油 润滑相比，对轴承来说具有更好的润滑效果和冷却效果。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:26.0pt;line-height:23.3pt;mso-line-height-rule: exactly;background:transparent"> </p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:26.0pt;line-height:23.3pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size:9.0pt;font-family:宋体;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“数控加工中心主轴轴承油气润滑机理研究”，因为编辑困难导致有些函数、表格、图片、内容无法显示，有需要者可以在网络中查找相关文章！本文由伯特利数控整理发表文章均来自网络仅供学习参考，转载请注明！</span></p> </div> <p><span style="font-size:11.0pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"; mso-bidi-font-family:"Times New Roman";mso-ansi-language:#0400;mso-fareast-language: #0400;mso-bidi-language:AR-SA"><br clear="all" style="page-break-before:always; mso-break-type:section-break" /> </span></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> <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'>数控加工中心</a> <a href='/index.php?case=tag&act=show&tag=CNC%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' 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