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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>加工中心展开式镗刀加工曲轴孔的运用<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> 曲轴孔作为发动机缸体的重要孔系和设计及定位 基准，其加工质量直接影响发动机的装配精度及整体运转性能。 曲轴孔的形状精度、位置精度要求高，生产中经常需要对曲轴孔加工工艺进行研究和改进， 以提升加工质量和加工效率，满足当前各动力总成机加工企业对产品质量、加工效率、智能化及柔性化生产越来 越高的要求［1］。</p><p>1 曲轴孔加工工艺的选择 </p><p> 曲轴瓦盖合盖前或上下缸体合盖前，对曲轴半圆孔进行粗加工，主要作用是去除多余毛坯硬皮和加工余量。曲轴瓦盖合盖后或上下缸体合盖后， 对曲轴孔进行整体式半精加工和精加工， 以确保曲轴孔的形状精度和位置精度等达到要求［2］。 为保证曲轴孔的形位精度， 上汽通用汽车动力总成机加工生产线传统上在专用<a href="http://www.bethel-cnc.com/" target="_blank"><a href='http://www.bethel-cnc.com/' target='_blank'>机床</a></a>上使用组合式镗刀 进行半精镗和精镗加工，每组刀片对应相应的加工位置和加工余量。 在曲轴孔镗刀远端导向杆处进行导向和支撑，以保证曲轴孔加工的形位精度。曲轴孔镗刀通 过偏心进刀和退刀，避免曲轴孔镗刀刀片磕碰曲轴孔。 由于镗刀不具备胀刀功能， 因此这一加工方案一般无法通过<a href="http://www.bethel-cnc.com/" target="_blank"><a href='http://www.bethel-cnc.com/' target='_blank'>加工中心</a></a>来实现［3-7］， 无法加工缸体上其它特征，加工柔性化较差。<a href="http://www.bethel-cnc.com/" target="_blank"><a href='http://www.bethel-cnc.com/' target='_blank'>加工中心</a></a>采用掉头镗孔的方式进行曲轴孔加工， 曲轴孔镗刀悬伸较长， 且曲轴孔孔长一般大于 300 mm，因此采用两头镗进的加工方案。 由于镗杆呈悬臂状态，悬伸较长，刚性和强度较差，易引起振动，因此难以保证被镗曲轴孔的尺寸精度和形位精度。 基于以上情况， 上汽通用汽车只在曲轴孔粗镗加工时利用<a href="http://www.bethel-cnc.com/" target="_blank"><a href='http://www.bethel-cnc.com/' target='_blank'>加工中心</a></a>进行曲轴孔掉头镗加工。可见， 在专用<a href="http://www.bethel-cnc.com/" target="_blank"><a href='http://www.bethel-cnc.com/' target='_blank'>机床</a></a>上用镗刀加工曲轴孔或在<a href="http://www.bethel-cnc.com/" target="_blank">加工中心</a>上掉头镗曲轴孔，由于存在各种局限性，已经无法满足当前先进制造企业对生产线高效率、柔性化、智能化的需求。于是，采用带推拉杆的<a href="http://www.bethel-cnc.com/" target="_blank">加工中心</a>展开式镗刀加工曲轴孔，逐步被越来越多的先进制造企业所关注、研究和应用。</p><p> 2 带推拉杆的展开式曲轴孔镗刀应用 </p><p> 带推拉杆的展开式曲轴孔镗刀，具有收刀、胀刀加工、自动换刀及直径自动补偿等功能［8-9］。 以上汽通用汽车某发动机缸体曲轴孔的加工为 例，对采用带推拉杆的<a href="http://www.bethel-cnc.com/" target="_blank">加工中心</a>展开式曲轴孔镗刀应用进行分析，通过刀具推拉杆的轴向移动，实现半精镗 刀片和精镗刀片的径向收刀、胀刀，以及直径方向刀具 补偿等功能。 刀具半精加工档，刀夹号为 1.1～1.4，直径为 48.655 mm。 精加工档， 刀夹号为 2.1～2.4， 直径为48.815 mm。半精镗和精镗直径可以通过<a href="http://www.bethel-cnc.com/" target="_blank">机床</a>控制程序进行精确补偿，保证加工的稳定性和高效率。 宇匠数控 备注：为保证文章的完整度，本文核心内容由PDF格式显示，如未有显示请刷新或转换浏览器尝试，手机浏览可能无法正常使用！</p><p>结论 </p><p> 对采用展开式镗刀加工曲轴孔的加工中心设备能力进行验收，曲轴孔尺寸精度、圆柱度的能力指数均完全满足上汽通用汽车设备能力验收的要求。 由于展开式曲轴孔镗刀具有直径补偿功能， 减小了因刀片磨损而引起的曲轴孔直径变化， 过程能力指数相比传统曲轴孔加工方式更高，加工稳定性更好。通过与传统曲轴孔加工方案的比较， 并对展开式曲轴孔镗刀在加工中心进行应用研究， 实现了发动机 缸体机加工线真正意义上的柔性化加工，减少了基准转化带来的公差损失，从而提升了加工质量。 刀具自动补偿功能提高了加工效率和加工稳定性。 这一缸体曲轴孔加工方案是当前先进的制造加工工艺，对发动机缸体机加工具有一定的指导意义。</p><p><br/></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> <!-- 分类 --> <div class="blank10"></div> 分类： <a href='/bethel/type/jnc/type-1.html' target='_blank'>加工中心</a> <div class="blank30"></div> <!--自动调用自定义字段--> <div class="blank20"></div> <div class="blank30"></div> <!-- 投票 --> <script src="/index.php?case=vote&act=view&aid=2448"></script> <!-- 自定义表单开始 --> <!-- 自定义表单结束 --> <div class="blank60"></div> <!-- 上下页开始 --> <div id="page"> <strong>上一篇</strong><a href="/bethel/news/show_2447.html">加工中心用永磁同步电主轴分析</a> <div class="blank10"></div> <strong>下一篇</strong><a href="/bethel/news/show_2449.html">加工中心主轴系统的可靠性分析</a> </div> <!-- 上下页结束 --> </div><!-- /container --> <!-- 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