Stepwise Topology Optimization Design Of The Structure Of Machine Tool

Currently,the structure design of machine tool depends on the empirical formula and analogy of the same type of machine tool,leading to traditional of the design structure,low material utilization and long design cycle.It is difficult to meet the market requirements of product update speed,so seeking an effective design method of machine tool structure is of great significance.Therefore,in this paper,taking the basic components of JIG630 horizontal machining center such as column,the slide plate and the spindle box as the research object,carry out the work related to topology optimization of “bob-in-box” structure,so as to improve the static and dynamic performance of machine tool and realize lightweight.The main contents of this paper are as follows:Stepwise topology optimization method is put forward and combining the method with the dimension optimization technology to form a set of integrated optimization design method for machine tool structure.The related theoretical basis of the method is studied,and the mathematical model of topology optimization is established.The mechanical analysis of the column and slide plate of the key structural components of the machining center is carried out,and the preprocessing of the finite element analysis before topology optimization is introduced.The topology optimization design of the column,slide plate and spindle box of JIG630 horizontal machining center is completed,which improves the static and dynamic performance of the structure and realizes lightweight.First analyzing the functional constraints of structure establishes topology optimization of initial model components.The objective function and constraints are set up by TOSCA software,and the topology optimization design of external contour is completed as the first step;According to this,the outer contour of the model is constrained to realize the topology optimization design of the inner stiffener structure.The topology optimization model is parameterized and the size optimization is realized by the response surface method.The final design structure and the traditional design structure are compared with the finite element analysis to verify the effectiveness of the design method.The experimental model of the equivalent reduction of the 1:2 ratio of the horizontal machining center column and the static stiffness and the modal test scheme are designed.Based on the experimental results,the static stiffness,the first three natural frequencies and modes are calculated.The finite element analysis results are compared with the measured results,and the reasons for the gap between the two results are briefly analyzed.It was proved that the static and dynamic performance of the column with variable section design structure is improved,and the stepwise topology optimization design method is of feasibility.