公开(公告)号：US20060048576A1

公开(公告)日：2006-03-09

申请号：US10498876

申请日：2003-01-17

申请人： Akihiro Kiuchi ,  Yutaka Ishii ,  Youichi Matsumoto ,  Masaru Kawabe ,  Hiroshi Narai ,  Naoko Yokoyama

发明人： Akihiro Kiuchi ,  Yutaka Ishii ,  Youichi Matsumoto ,  Masaru Kawabe ,  Hiroshi Narai ,  Naoko Yokoyama

IPC分类号： G01M13/04 ,  F16C19/00

CPC分类号： G01N29/11 ,  F16C33/12 ,  F16C33/30 ,  F16C2204/60 ,  G01N29/2456 ,  G01N29/265 ,  G01N29/28 ,  G01N2291/014 ,  G01N2291/0234 ,  G01N2291/02836 ,  G01N2291/0421 ,  G01N2291/0422 ,  G01N2291/101 ,  G01N2291/2696

摘要： A first object is to provide a method for evaluating large-sized inclusions in a bearing steel. The method enables quantitative evaluation of large-sized inclusions even if the steel has a high degree of cleanliness. Further, a second object is to provide an appropriate bearing steel evaluated by the method for evaluating large-sized inclusions. Further, a third object is to provide a rolling bearing capable of eliminating short life products and cracked products and providing longer lifetime for entire bearings. In order to achieve the first object, a round bar formed of a bearing steel to be evaluated and an ultrasonic probe are placed in an ultrasonic transmission medium, and the size and number of large-sized inclusions that are present in the flaw detection volume are measured to estimate the existence probability of large-sized inclusions in the bearing steel to be evaluated. The second object is achieved by specifying large-sized inclusions that are present in the bearing steel in accordance with the method for evaluating large-sized inclusions. Further, to achieve the third object, a rolling bearing is manufactured from a seamless steel tube, as material, having a diameter of 180 mm or less and a wall thickness of 25 mm or less, and ensured that it does not include a defect having a length of 1 mm of more at its material stage.

摘要翻译： 第一个目的是提供一种用于评估轴承钢中的大尺寸夹杂物的方法。 该方法能够对大尺寸夹杂物进行定量评价，即使钢具有高度的清洁度。 此外，第二个目的是提供通过用于评估大尺寸夹杂物的方法评估的合适的轴承钢。 此外，第三个目的是提供一种能够消除短寿命产品和破裂产品并为整个轴承提供更长寿命的滚动轴承。 为了实现第一个目的，将由待评估的轴承钢形成的圆棒和超声波探头放置在超声波传播介质中，并且存在于探伤体积中的大尺寸夹杂物的尺寸和数量是 测量以评估待评估的轴承钢中大尺寸夹杂物的存在概率。 第二个目的是通过根据用于评估大尺寸夹杂物的方法来指定存在于轴承钢中的大尺寸夹杂物来实现的。 此外，为了实现第三个目的，一种滚动轴承由直径为180mm以下且壁厚为25mm以下的无缝钢管作为材料制造，并且确保不包括具有 在其材料阶段的长度为1毫米。