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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 ); //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="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>加工中心进给路线的确定<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><strong><span style="font-size:19px;font-family:宋体">一、顺铣和逆铣的选择</span></strong></p><p style="text-indent:28px"><span style=";font-family:宋体">图为使用立铣刀进行切削时的顺铣与逆铣（俯视图）。为便于记忆我们把顺铣、逆铣归纳为：切削工件外轮廓时，绕工件外轮廓顺时针走刀即为顺铣，绕工件外轮廓逆时针走刀即为逆铣；切削工件内轮廓时，绕工件内轮廓逆时针走刀即为顺铣，绕工件内轮廓顺时针走刀即为逆铣。</span></p><p style="text-indent:28px"> </p><p style="text-align:center"><img src="/upload/images/201810/15402830566292.png" title="15402830566292.png" alt="15402830566292.png" style="width: 500px; height: 139px;" height="139" width="500" vspace="0" border="0"/> </p><p style="text-align:center"><span style="font-size:12px"> </span><span style="font-size:12px;font-family:宋体">（</span><span style="font-size:12px">a</span><span style="font-size:12px;font-family:宋体">）</span><span style="font-size:12px"> </span><span style="font-size:12px;font-family:宋体">（</span><span style="font-size:12px">b</span><span style="font-size:12px;font-family:宋体">）</span></p><p style="text-align:center"><span style="font-size:12px;font-family:宋体">顺铣与逆铣</span></p><p style="text-align:center"><span style="font-size:12px"> </span></p><p style="text-align:center"><img src="/upload/images/201810/15402830883494.png" title="15402830883494.png" alt="15402830883494.png" style="width: 500px; height: 215px;" height="215" width="500" vspace="0" border="0"/></p><p style="text-align:center"><span style="font-size:12px;font-family:宋体">（</span><span style="font-size:12px">a</span><span style="font-size:12px;font-family:宋体">）</span><span style="font-size:12px"> </span><span style="font-size: 12px;font-family:宋体">（</span><span style="font-size:12px">b</span><span style="font-size:12px;font-family:宋体">）</span></p><p style="text-align:center"><span style="font-size:12px"> </span><span style="font-size:12px;font-family:宋体">顺铣、逆铣与走刀的关系一</span></p><p style="text-align:center"><span style="font-size:12px"> </span></p><p style="text-align:center"><span style="font-size:12px"> </span></p><p style="text-align:center"><img src="/upload/images/201810/15402830984755.png" title="15402830984755.png" alt="15402830984755.png" style="width: 500px; height: 182px;" height="182" width="500" vspace="0" border="0"/></p><p style="text-align:center"><span style="font-size:12px;font-family:宋体">（</span><span style="font-size:12px">a</span><span style="font-size:12px;font-family:宋体">）</span><span style="font-size:12px"> </span><span style="font-size:12px;font-family:宋体">（</span><span style="font-size:12px">b</span><span style="font-size:12px;font-family:宋体">）</span></p><p style="text-align:center"><span style="font-size:12px;font-family:宋体">顺铣、逆铣与走刀的关系二</span></p><p style="text-indent:29px"><strong><span style="font-size:19px"> </span></strong></p><p style="text-indent:29px"><strong><span style="font-size:19px">2.</span></strong><strong><span style="font-size:19px;font-family: 宋体">顺铣、逆铣对切削的影响</span></strong></p><p style="text-indent:29px"><span style=";font-family:宋体">对于立式数控<a href="http://www.bethel-cnc.com/" target="_blank"><a href='http://www.bethel-cnc.com/' target='_blank'>加工中心</a></a>（<a href="http://www.bethel-cnc.com/" target="_blank"><a href='http://www.bethel-cnc.com/' target='_blank'>加工中心</a></a>）所采用的立铣刀，装在主轴上时，相当于悬臂梁结构，在切削加工时刀具会产生弹性弯曲变形，如图所示。</span></p><p style="text-align:center"><img src="/upload/images/201810/15402831559646.png" title="15402831559646.png" alt="15402831559646.png" style="width: 500px; height: 171px;" height="171" width="500" vspace="0" border="0"/></p><p style="text-align:center"><span style="font-size:12px;font-family:宋体">（</span><span style="font-size:12px">a</span><span style="font-size:12px;font-family:宋体">）</span><span style="font-size:12px"> </span><span style="font-size:12px;font-family:宋体">（</span><span style="font-size:12px">b</span><span style="font-size:12px;font-family:宋体">）</span></p><p style="text-align:center"><span style="font-size:12px;font-family:宋体">顺铣、逆铣对切削的影响</span></p><p style="text-align:center"><span style="font-size:12px"> </span></p><p style="text-indent:29px"><span style=";font-family:宋体">从图可以看出，当用立铣刀顺铣时，刀具在切削时会产生让刀现象，即切削时出现“欠切”；而用立铣刀逆铣时，刀具在切削时会产生啃刀现象，即切削时出现“过切”。这种现象在刀具直径越小、刀杆伸出越长时越明显，所以在选择刀具时，从提高生产率、减小刀具弹性弯曲变形的影响这些方面考虑，应选直径大的；在装刀时刀杆尽量伸出短些。</span></p><p style="text-indent:29px"><span style=";font-family:宋体">在编程时，如果粗加工采用顺铣，则可以不留精加工余量（余量在切削时由让刀让出）；而粗加工采用逆铣，则必须留精加工余量，预防由于“过切”引起加工工件的报废。</span></p><p style="text-indent:29px"><span style=";font-family:宋体">为此，为编程及设置参数的方便，我们在后面的编程中，粗加工一律采用顺铣；而半精加工或精加工，由于切削余量较小，切削力使刀具产生的弹性弯曲变形很小，所以既可以采用顺铣，也可以采用逆铣。</span></p><p style="text-indent:32px"><span style="font-size:16px;font-family:宋体"> </span></p><p><strong><span style="font-size:19px;font-family:宋体">二、铣削外轮廓的进给路线</span></strong></p><p style="text-indent:21px"><span style=";font-family:宋体">（1）铣削平面零件外轮廓时，一般采用立铣刀侧刃切削。刀具切入工件时，应避免沿零件外轮廓的法向切入，而应沿切削起始点的延伸线逐渐切入工件，保证零件曲线的平滑过渡。在切离工件时，也应避免在切削终点处直接抬刀，要沿着切削终点延伸线逐渐切离工件。</span></p><p><span style=";font-family:宋体"> </span><span style=";font-family:宋体">（2）当用圆弧插补方式铣削外整圆时 要安排刀具从切向进入圆周铣削加工，当整圆加工完毕后，不要在切点处直接退刀，而应让刀具沿切线方向多运动一段距离，以免取消刀补时，刀具与工件表面相碰，造成工件报废</span></p><p><span style=";font-family:宋体"> </span></p><p style="text-indent: 36px; text-align: center;"><strong><span style="font-size:16px;font-family:宋体"><img src="/upload/images/201810/15402831657596.png" title="15402831657596.png" alt="15402831657596.png" style="width: 250px; height: 197px;" height="197" width="250" vspace="0" border="0"/><img src="/upload/images/201810/15402831715242.png" title="15402831715242.png" alt="15402831715242.png" style="width: 250px; height: 227px;" height="227" width="250" vspace="0" border="0"/></span></strong></p><p><strong><span style="font-size:16px;font-family: 宋体"> </span></strong></p><p><strong><span style="font-size:16px;font-family: 宋体">3</span></strong><strong><span style="font-size:16px;font-family:宋体">．铣削内轮廓的进给路线</span></strong></p><p style="text-indent:27px"><img src="/upload/images/201810/15402832603862.png" title="15402832603862.png" alt="15402832603862.png" style="width: 200px; height: 197px;" height="197" width="200" vspace="0" border="0"/><strong><span style=";font-family:宋体"><br/></span></strong></p><p style="text-indent:27px"><strong><span style=";font-family:宋体">（1）铣削封闭的内轮廓表面，若内轮廓曲线不允许外延</span></strong><span style=";font-family:宋体">，刀具只能沿内轮廓曲线的法向切入、切出，此时刀具的切入、切出点应尽量选在内轮廓曲线两几何元素的交点处。<strong>当内部几何元素相切无交点时</strong>，为防止刀补取消时在轮廓拐角处留下凹口,刀具切入、切出点应远离拐角。</span></p><p style="text-indent:28px"><strong><span style=";font-family:宋体">（2）当用圆弧插补铣削内圆弧时</span></strong><span style=";font-family:宋体">也要遵循从切向切入、切出的原则，最好安排从圆弧过渡到圆弧的加工路线，提高内孔表面的加工精度和质量。</span></p><p style="text-indent:28px"><span style=";font-family:宋体"> </span></p><p style="text-indent:24px"><span style="font-size:16px;font-family:宋体"><img src="/upload/images/201810/15402833936752.png" title="15402833936752.png" alt="15402833936752.png" style="width: 500px; height: 196px;" height="196" width="500" vspace="0" border="0"/><br/></span></p><p style="text-indent:48px"><span style="font-size:16px;font-family:宋体"> </span></p><p><strong><span style="font-size:16px;font-family: 宋体">4</span></strong><strong><span style="font-size:16px;font-family:宋体">．铣削内槽的进给路线</span></strong></p><p style="text-indent:28px"><span style=";font-family:宋体">所谓<strong>内槽</strong>是指以封闭曲线为边界的平底凹槽。一律用平底立铣刀加工，刀具圆角半径应符合内槽的图纸要求。下图所示为加工内槽的三种进给路线。分别为用行切法和环切法加工内槽。两种进给路线的共同点是都能切净内腔中的全部面积，不留死角，不伤轮廓，同时尽量减少重复进给的搭接量。不同点是行切法的进给路线比环切法短，但行切法将在每两次进给的起点与终点间留下残留面积，而达不到所要求的表面粗糙度；用环切法获得的表面粗糙度要好于行切法，但环切法需要逐次向外扩展轮廓线，刀位点计算稍微复杂一些。采用图c所示的进给路线，即先用行切法切去中间部分余量，最后用环切法环切一刀光整轮廓表面，既能使总的进给路线较短，又能获得较好的表面粗糙度。</span></p><p><span style="font-size:16px;font-family:宋体"> <img src="/upload/images/201810/15402834905520.png" title="15402834905520.png" alt="15402834905520.png" style="width: 500px; height: 153px;" height="153" width="500" vspace="0" border="0"/> </span></p><p><strong><span style="font-size:16px;font-family: 宋体">5</span></strong><strong><span style="font-size:16px;font-family:宋体">．铣削曲面轮廓的进给路线</span></strong></p><p style="text-indent:28px"><span style=";font-family:宋体">铣削曲面时，常用球头刀采用“行切法”进行加工。所谓<strong>行切法</strong>是指刀具与零件轮廓的切点轨迹是一行一行的，而行间的距离是按零件加工精度的要求确定的。</span></p><p><strong><span style=";font-family:宋体"> </span></strong><strong><span style=";font-family:宋体">对于边界敞开的曲面加工</span></strong><span style=";font-family:宋体">，可采用两种加工路线，如下图所示发动机大叶片，当采用图a所示的加工方案时，每次沿直线加工，刀位点计算简单，程序少，加工过程符合直纹面的形成，可以准确保证母线的直线度。当采用图b所示的加工方案时，符合这类零件数据给出情况，便于加工后检验，叶形的准确度较高，但程序较多。由于曲面零件的边界是敞开的，没有其他表面限制，所以曲面边界可以延伸，球头刀应由边界外开始加工。</span></p><p><span style="font-size:16px;font-family:宋体"><img src="/upload/images/201810/15402835321014.png" title="15402835321014.png" alt="15402835321014.png" style="width: 500px; height: 217px;" height="217" width="500" vspace="0" border="0"/></span></p><p> </p><p> </p><p> </p><p> </p><p> </p><p><br/></p></div> <div class="blank30"></div> <!-- 分类 --> <div class="blank10"></div> 分类： <a href='/bethel/type/jnc/type-1.html' 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target="_blank">[了解更多]</a></p> </div> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>20</span> <p>2020-10</p> </div> <h4><a title="CNC加工中心钻攻异型散热器的夹具设计" href="/bethel/news/show_2701.html" target="_blank">CNC加工中心钻攻异型散热器的夹具设计</a></h4> <p>1 问题的提出数控加工夹具是数控CNC机械制造加工过程中用来 固定加工对象，使之占有正确的位置，以满足加工工艺条件、迅速、方便、安全地安装工件的装置。夹具通常由定位元件、夹紧装置 、对刀引导元件、分度装置、连接元件及夹具体等组成[1]。图1所示零件是应用于系列矿用防爆电器产品上的… <a href="/bethel/news/show_2701.html" target="_blank">[了解更多]</a></p> </div> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>21</span> <p>2020-10</p> </div> <h4><a title="五面体加工中心" href="/bethel/cnc/show_2614.html" target="_blank">五面体加工中心</a></h4> <p>产品规格Product specifications项目单位V11数控系统三菱 M80B行程X轴行程(工作台左右)mm1100Y轴行程(主轴头上下)mm600Z轴行程(工作台前后)mm700主轴端面~工作中心距离mm180~780主轴中心~工作台面距离50~750旋转工作台工作台…… <a href="/bethel/cnc/show_2614.html" target="_blank">[了解更多]</a></p> </div> <!-- 内容列表结束 --> </div> <!-- 相关文章结束 --> <div class="blank60"></div> <!-- 评论框开始 --> <!-- 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