Mechanism Design And Key Technique Research About Steel Ball Defect Checking System

In modern industry manufacturing, with the requirement of high accuracy, high speed and high quality getting increasingly, bearing is playing a more important role than ever, almost all kind of equipments are rely on it. How well the quality of steel ball as main part of bearing is will greatly affect bearing's traits such as bearing's precision, mobile character and working lifespan etc.. Statistic data from Harbin Bearing group shows 65% of all bearing invalidation forms are result from crack and slit. As a result, we must strictly check the defects of steel ball surface, especially to crack and slit.Nowadays, domestic steel ball produce factories check the surface quality of steel ball mostly depend on eyes, for man's limited eyesight, it not only takes up heavy workload, but cannot ensure the quality of steel ball because of manual omitting. The requirement of steel ball surface quality is heightening in bearing industry and it needs a kind of steel ball automatic checking device urgently to accurately check steel ball surface defects.The main aim in this thesis is to make machinery design to steel ball surface defects checking device which based on image technology, so that the device can ensure the automatic process of steel ball's feeding, transmission, unfolding and separation. Firstly, system mechanism frame was set up. Whole design scheme, basic design demanding and design technique route of UG were suggested. Then we researched the working theory of meridian unfolding that was the key technology in this thesis, finished preliminary mechanism design and carried on the whole assembly. Taken meridian unfolding experimental platform for example, we adopted method of assembly character modeling and dimension linked technique from interpart. Finally, parametric design was applied in part's building. Combining law curve with free form modeling, we put forward a mixed modeling method for the building of meridian unfolding wheel. Moreover, the standard parts library was set up by use of part families. As a new ways, parametric design and virtual assembly were implemented into the steel ball defects checking device design, these could result in not only completing the whole design of device's parts but also reducing the design period, improving the design precision, and making the prepare for the whole checking device's tentative manufacture.