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一种新型的检测圆柱滚子表面裂纹的涡流探伤仪,由航空航天部633研究所与哈尔滨轴承厂共同研制成功,近日通过部级技术鉴定。该仪器是机电配套设备、具有检测、自动分选功能,只要对仪器按所需要的检出“废品”标准,调定仪器的“相位”及“灵敏度”,即可正常检测。其通过送料装置,定时间隔的将滚子送到机械展开装置上,使其作螺旋直线前进运动,对圆柱滚子作整个外圆表面的完全扫描、接受点状涡流探头的检测、质量合格的滚子被输送到贮料箱;质量不合格的“废品”滚子,面板上裂纹指示灯即闪亮、同时触发废子门即行开启、“废品”滚子即被输送到废料箱、从而实现了自动检测及分选。仪器能检测直径ψ9～ψ14滚子的表面裂纹、压痕、凹坑、折迭、磨伤等缺陷,对于肉眼难以观察到的细小裂纹及外径面近倒角处缺陷亦十分敏感。仪器灵敏度(检测裂纹深度)0.03～0.05毫米,漏检率小于0.2%,检测速度可达2000余粒/小时,并可调节、改变机械展开装置、还可扩大被检测滚子的外径规格。
A new type of eddy current flaw detector for detecting the surface crack of cylindrical roller was successfully developed jointly by the Institute of Aeronautics and Astronautics 633 and Harbin Bearing Factory and recently passed the ministerial level technical appraisal. The instrument is a mechanical and electrical equipment, with testing, automatic sorting function, as long as the instrument according to the required detection of “waste” standard, set the instrument “phase” and “sensitivity”, you can normally detect. It sends the roller to the mechanical expansion device through the feeding device and the timing interval to make the spiral straight forward movement. The entire outer cylindrical surface of the cylindrical roller is completely scanned, and the detection of the point eddy current probe is accepted, and the quality is qualified Roller is transported to the storage box; unqualified “waste” roller, the panel on the crack indicator that shines, at the same time trigger the waste door that is open, “waste” roller is delivered to the waste box, in order to achieve Automatic detection and sorting. Instrument can detect ψ9 ~ ψ14 diameter roller surface cracks, indentation, pits, folding, abrasion and other defects for the naked eye is difficult to observe the small cracks and outer diameter near chamfer defects are also very sensitive. Instrument sensitivity (detection of crack depth) of 0.03 to 0.05 mm, missed detection rate of less than 0.2%, the detection rate of up to more than 2,000 / hour, and can be adjusted to change the mechanical expansion device, but also to expand the outer diameter of the detected roller size.