High Speed Online Sorting Technology For The Diameter Of Tapered Rollers

Tapered rollers is an important part of tapered roller bearings. When theirdiameter different from each other, the number of rollers which load would bereduced, and the stress would be increased to some individual rollers, leading to theperformance of bearings reducing. Measuring and sorting tapered rollers is a veryimportant process in tapered roller bearings assembling, which will directly affect thequality of the bearing products. So, a method to measure and sort the diameter of thetapered rollers with high accuracy and high efficiency is researched in this paper.The sphere base surface locating principle is demonstrated by mathematicalmodeling analysis in this paper. The photoelectric measuring method is used todevelope the prototype of sorting machine, which consists of mechaniscal part andmeasuring&controlling part..The mechaniscal part mainly consists of a rollers transport module, a positioningmodule, a group blanking module, a rack, and so on. The rollers transport moduletransports the rollers in the way of intermittent motion, which is controlled preciselyby servo system. The positioning module is used to position the tapered rollers, lasermicrometer, and proximity switch reliably. The group blanking module useselectromagnets to drive valves to turn, realizing group blanking quickly.The measuring&controlling part consists of the hardware and software. Thehardware mainly consists of a diameter measuring module and a motion controllingmodule, which are controlled by a IPC. The motion controlling module mainlyinclude servo system, the group blanking electromagnets, a proximity switch and I/Ointerface module, which achieving rollers delivery and group blanking. The diametermeasuring module mainly include the laser micrometer, which achieving measuringthe diameter of rollers. The software was programmed based on LabVIEW, whichmainly consists of a intermissive motion controlling module, a diameter measuringmodules, a group blanking module.The performance test show that the prototype could sort the rollers at the speedof180pieces per minute, and the repeat accuracy is±1μm. This sorting machineprototype can meet the requirement of automatic sorting the rollers with highaccuracy and high efficiency.