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href="http://www.bethel-cnc.com/" target="_blank">机床</a>噪声大，且在加工零件时出现尺寸不准的现象</p><p>2,故障分析：数控<a href="http://www.bethel-cnc.com/" target="_blank">加工中心</a>有三个轴，分别为 X，Y，Z，三个轴都是通过滚珠丝杠副与平台连接， 通过伺服电机与皮带传动已达到平台移动的目的，所以机床三个轴的位移精度直接影响零件的加工精度，现在出现尺寸不准，且噪声大这与滚珠丝杠副必定有一定的关系，经拆卸后排除电机和传动皮带的故障。</p><p>3,故障排除：</p><p>3.1,滚珠丝杠副的故障排除</p><p>在数控<a href="http://www.bethel-cnc.com/" target="_blank">加工中心</a>中，滚珠丝杠是进给传动的主要部件，它可将伺服电动机的旋转运动转变为直线运动，用较小的转矩可以获得很大的推力。滚珠丝杠副的基本结构如图 1-1 所示。滚珠丝杠副的主要故障现象有噪声、运动不灵活及润滑不良等。</p><p> </p><p><img src="/upload/images/201810/15401884843294.png" title="15401884843294.png" alt="图片.png"/></p><p>图 1-1 滚珠丝杠副的基本结构</p><p> </p><p> </p><p>滚珠丝杠副噪声大的故障原因及排除方法有以下几种：</p><p>3.2,丝杠支承轴承的压盖压合情况不良。排除方法为调整轴承压盖，使其压紧轴承端面。</p><p>3.3,丝杠支承轴承可能破损。排除方法为更换破损轴承。</p><p>3.4,电动机与丝杠联轴器松动。排除方法为拧紧联轴器锁紧螺钉。</p><p>3.5,丝杠润滑不良。排除方法为改善润滑条件，使润滑油量充足。</p><p>3.6,滚珠丝杠副滚珠有破损。排除方法为更换新滚珠。 滚珠丝杠转动不灵活的故障原因及排除方法有以下几种：</p><p>3.7,轴向预加载荷太大。排除方法为调整轴向间隙和预加载荷。</p><p>3.8,丝杠与导轨不平行。排除方法为调整丝杠支座位置，使丝杠与导轨平行。</p><p>3.9,螺母轴线与导轨不平行。排除方法为调整螺母座的位置，使螺母轴线与导轨平行。</p><p>3.10,丝杠弯曲变形。排除方法为校直丝杠。</p><p> </p><p>4,故障总结：此类故障是数控<a href="http://www.bethel-cnc.com/" target="_blank">加工中心</a>比较常见的故障，主要是对滚珠丝杠副的保养不到位所以对于安装和保养需要注意以下事项：</p><p>4.1,滚珠丝杠属精密传装置，必须进行润滑。在螺母内推荐使用钾皂基润滑脂 1-3 号透平油润滑，</p><p>4.2,滚珠丝杠与滚动轴承一样，混入灰尘异物，将会降低使用寿命。因此，必须采用丝杠保护套加以保护。</p><p>4.3,由于滚珠丝杠螺母的特殊结构，不宜承受径向负荷，以免造成丝杠弯曲，影响传动精度和运动的灵活性，降低使用寿命。故安装时，尤其要注意丝杠的轴心线与螺母座移动轨迹的平行，并使丝杠支撑中心轴线应与螺母中心轴线一致。</p><p>4.4 将丝杠安装于设备上，注意不能使丝杠与螺母分离，以免滚珠脱出。安装时不要敲打滚珠丝杠副，尤其注意保护滚珠导轨，因其管壁较薄，碰撞变形将使钢球流动受制约。</p><p>影响机床精度的因素有很多，所以故障出现时应当遵循先易后难的顺序，不要盲目拆卸。</p><p> </p><p>5,结束语</p><p><a href="http://www.bethel-cnc.com/" target="_blank">数控加工中心</a>和加工中心的液压系统也会出现故障，但是其液压原理通过机床图纸中的液压原理图都会大致分析出故障点，主要是通过液压泵提供压力，电磁伺服比例阀来控制油路以达到油缸换向的目的。如果有一路没有动作可以通过液压图来找出其控制阀，并检查控制阀的完好。保证液压泵进油口的过滤器清洁以及各油路接头无漏油。</p><p><br/></p></div> <div class="blank30"></div> <!-- tag --> <div class="blank10"></div> 标签： <a 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