Abstract:

According to the production requirements of surface defects detection of the steel ball used in bearings, the unfolding principle of spherical spiral line motion is proposed, aiming at unfolding the whole sphere surface. Firstly, the conical driving body with inclined shaft cone is designed which can make the whole surface unfolding of steel ball possible. Meanwhile the cone model is built. Secondly, the motion parameters of one point on the steel ball in the process of unfolding are analyzed, the contact constraint model between the steel ball and the driving body is established, and the motion trajectory model of the contact point on the driving cone is fitted and solved out by iterative method. Thirdly, in order to ensure the full unfolding of whole steel ball surface, the contact trajectory model is further analyzed, and by using arc integral, the contact trajectory curve model is obtained. Finally, through the simulation technology and the experiment of physical prototype, the unfolding process of steel ball is analyzed and tested, which verifies the validity of the theoretical analysis results. The principle and method of sphere surface unfolding can be applied to the surface defects detection equipment of rolling balls used in high precision bearings and can also provide theoretical reference for the detection of other spherical objects.

Key words: defects detection, inclined shaft cone, sphere surface unfolding, surface defects, steel ball