| The rocker drilling machine is a kind of machine tool that is widely used in machine building profession as well as in machinery repair department.The traditional rocker drilling machine is designed through the methods of experience and analogy without analysis and calculation to its structure.Though at present large-scale rocker drilling machine is produced by factory through expanding certain proportion from the whole according to users'demand,the structure and dynamic performance of the driller can not obtain guarantee.Therefore,it is with vital significance to carry on parameter modeling and finite element analysis to the supporting parts of rocker drilling machine.The article realizes its parametric modeling based on the second development technology of CATIA, According the data I/O between CATIA and ANSYS, model is carried on finite element analysis after it is exported UG to ANSYS,in order to get the support part with best structure.The concrete work can be started by the following several aspects: 1. Introducing the present research situation of domestic and foreign rocker drilling machine,the research condition and development of finite element analysis in designing process,and elaborate the importance of finite element analysis during the designing process,At present mechanical product had entered a period of computer-aided design and automatic design,and it is moving forward unceasing with finite element-optimization design as its center.By unifying the static and dynamic analysis to support part of rocker drilling machine,The final goal of this article is to develop higher level support part with much improvement in rigidity, intensity, structure size, weight and so on, Thus it may improve the dynamic characteristics of the entire machine.2. Elaborating the deformation characteristics of support part, and carrying on stress analysis to support part. The bending and torsional deformation of the rocker is mainly caused by drilling force,The bending deformation of inside and outside columns is mainly caused by drilling force. Elaborating the basic ideas of the supporting finite element analysis,showing the flow chart,and making an introduction to the five basic steps of finite element analysis.Besides these, introducing finite element method, modal analysis and parameter-design technology, and giving a general introduction to Visual Basic, CATIA and ANSYS.3. Determining the ways and main steps of supporting parametric modeling, simplifying to the rocking shaft, side column and inside column separately, and determining the respective input parameters, editing parameter input contact surface of various supporting parts in Visual Basic 6.0, developing corresponding program module, and elaborating the mentality of founding various supporting model and the main program flow during the process of modeling module in detail..After repeated tests, all applications contact surface and procedure movement is normal, and these can realize the parametric modeling.4. According to the structures of support part in the Z3063X20/1 TYPE rocker drilling machine, making improvement to its weak link ad obtain four kind of different structures of rocking shaft, outside column and inside column, named I,II,III,IV TYPE rocking shaft; I,II,III,IV TYPE outside column; I,II,III.IV TYPE inside column. Inputting surface geometry parameter in contact of various support part, and induct the model to ANSYS through standardized data connection..First, through the finite element static analysis to four models of rocking shafts, obtaining the stress and strain distribution map of various models of rocking shafts, and determining the position of the biggest stress value, the biggest deformation quantity, the biggest stress and the biggest strain of various models of rocking shafts. Taking a line a which is formed by the intersection of left surface and latter end surface from bottom up as the way, it can produce a stress variation curve which corresponds to four models of rocking shafts intersection line a; a strain variation curve can be also got, by using a line b which is formed by the intersection of front surface and outside surface as the way. Through the conclusion and contrast between stress curve and strain curve, we can obtain that the structure of I TYPE rocking shaft is quite reasonable.Next, through the finite element static analysis to outside column and inside column of four kind of models, we obtain the stress and strain distribution map, and the position of the biggest stress value, the biggest deformation quantity, the biggest stress and the biggest strain. The outside column produce a stress variation curve which is correspondent with c of the four models, by taking the half circumference c of outer root diameter from right to left as the way; It also produces a strain variation curve which is correspondent with d of the four models, by taking the right flank generatrix d from bottom up as the way. Through the contrast between conclusion and curves, we can obtain that the structure of IV TYPE outside column is quite reasonable. The inside column produces a stress variation curve which is correspondent with of e of the four models, by taking the half circumference e of thin section outer root diameter from right to left as the way; It can also produces a strain variation curve which is correspondent with f the four models, by raking the thin section right flank generatrix f from bottom up as the way. Through the contrast between conclusion and curves, we can obtain that the structure of I TYPE inside column is quite reasonable.Finally, various supporting parts which have quite reasonable structures in the finite element static analysis are carried on model analysis, and the first six steps natural frequency and the corresponding vibration type are obtained. Through the analysis to the calculated result, we can value the dynamic characteristics of various supporting parts. All these can provide theory basis for the structure design of various supporting parts, and also improve the dynamic characteristics of the entire machine. |
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