Structure Optimization And Mechanical Analysis Of Back Spotfacer

With the rapid development of manufacturing technology, the continuous progress ofnational defense industry and the continuous improvement of user requirements, higherrequirements for the processing technology and processing quality of mechanical products arealso put forward. More and more anti counterbore structures appear not only in aviationaerospace, military and other industries. They also appear in boxes and brackets of large,heavy and complete equipments. As for the processing with closed structure and hollow innerside, a set of high performance back spotfacer tools must be designed. Because its base iscovered by other structures and it is limited by spatial location, general tools cannot workfrom the front side.As for the study of anti counterbore processing problems, based on the different designprinciples, traditional back spotfacer carries on mechanism design, which brings a certainimprovement to the enhancement of back spotfacer processing efficiency and the reduction ofworkers’ labor intensity. However, these are all wide cutting edge. When processed, thecutting edge is too long, the cutting force is large and there often occurs vibration, thusmaking anti counterbore very difficult and greatly affecting the extent of processingautomation as well as the improvement of production efficiency and processing surfacequality.In this research, a kind of new tool is designed, which draws on the advanced backspotfacer manufacturing technology at home and abroad and uses the motion decompositiontransmission principles of the space planetary. When it comes to the mechanical analysis ofback spotfacer, first of all, the relevant knowledge of mechanics and mechanical principles areused to design the structure model of this kind of back spotfacer. After a comprehensiveanalysis, it can be drawn that roller is the main factor which affects the cutting precision ofback spotfacer. Secondly, the finite element model is set up. And the static and dynamiccharacteristics analyses for the model are used, mainly including the radial deformation andnatural frequency of the roller. At last, based on the single factor analysis, the effect law ofroller’s wall thickness, inner diameter and length to its radial deformation and naturalfrequency can also be obtained. In view of these, the optimized design is used to roller and theoverall performance of optimized roller is greatly improved.All the analyses and conclusion in this paper provide a certain theoretical basis for thedesign of high performance back spotfacer. What’s more, this has very important practicalsignificance to shorten the development cycle of high performance back spotfacer.