Deformation Analysis And Tooling Optimization Precision Thin-walled Parts

In the field of aerospace,the engine needs a lot of thin wall cylinder or frame parts. However, most of them have a feature with a thin wall, large size, complicated structure, high processing precision and so on. Although these can reduce the quality of the engine and increase the thrust-weight ratio, it increases the difficulty of processing due to the poor rigidity, especially it is easy to produce larger clamping deformation under excessive clamping force. Therefore, in this state part is very easy to produce deformation under the action of the cutting force. However, using the traditional methods and general clamping fixture in the final clamping process generally can not meet the requirements, and it is difficult to ensure the accuracy requirements. Hence, predicting and controlling the deformation of thin-walled cylindrical parts processing has an important theoretical significance.This paper is mainly take the large diameter thin-walled cylinder parts as the research object. The elastic deformation of the parts had a great influence on machining accuracy and the clamping layout affect the size and distribution of cutting deformation. To reduce the maximum elastic deformation, we establish a thin wall cylinder or frame parts machining orthogonal analysis of fixture layout model and use the commercial finite element software ANSYS to calculate. Based on the further analysis of the results, this article select a tooling parameters with a lower deformation in spare parts processing and a more uniform distribution of deformation, and then put forward a reasonable parameters of the final fixture layout scheme. This article main research content is as follows:Firstly,this paper determine the cutting force of large diameter cylinder under complex parts in machining process as well as the pressure of tooling plate to the large diameter cylinder complex parts. It provides tooling variable factor data required for theorthogonal analysis. For the too much tooling parameters, which include the number of expansion, the pressure of upper and lower plate, the number and area of lower platen, we use orthogonal analysis to determine the number of toolingexperimental to reduce the workload of the latter part analysis. Meanwhile, this can understand the comprehensive factors of experimental conditions. All of those provide the number of analysis groups and load analysis model for the latter part deformation analysis.Secondly,we use the ANSYS to analysis the effect of precision parts flange bottom surface has accuracy tolerance and build a bottom parts model of roughness. By part (with roughness and without roughness) coMParing the maximum elastic deformation in cutting force analysis, determine the factors influencing the precision of thin wall parts precision roughness, which provides a theoretical basis for the latter model tooling layout.Finally, we build the parts roughness model and analysis the deformation of different state of the parts’tooling experimental groups. Then analog five locations of first level precision thin-walled parts and three locations of second level precision thin-walled parts for the same parameter tooling fixture state respectively. According to the reasonable principle of choosing the tooling, one is the minimum deformation and the other is a uniform deformation, find out the reasonable parameters of tooling and parameter optimization design for the tooling.