The Topology Optimization Method For The Key Components Of Precise Horizontal Machining Center Based On TOSCA

The precise horizontal machining center usually uses “box-in-box” structure.The structure has a high rigidity,which can be adapted to the requirements of fast moving and feeding,and has high speed and acceleration.Currently,the structural design of machine tools uses more traditional design methods,which requires a lot of design experience.It is lack of an efficient and convenient structure design method.So it is very important to use the efficient topology optimization method to design the structure of the key parts of machine tools.The slide board,the spindle box and the column are the key components of the precise horizontal machining center.They are box parts.Their performance plays a decisive role in precision machining performance.The static and dynamic characteristics of machine tools are important indexes to evaluate the performance of machine tools.Good static characteristics can guarantee the accuracy of machine tool processing,surface quality and production efficiency.Good dynamic characteristics can improve the vibration resistance and stability of machine tools.Thus improving the machine static and dynamic stiffness is particularly important and critical.At the same time,in order to save manufacturing costs,the design of machine tool structure must be realized.The main work is as follows:(1)A topology optimization method of box parts based on ABAQUS and TOSCA is proposed.First,the topology optimization of the key components' outline is achieved with assembling boundary conditions,which opens the design regions of initial model with maximum extent.A second optimization model is obtained based on the outline model.The inner layout for rid plate of the key components is obtained under the outline constraint.Finally,a new structure is provided.(2)Mechanical analysis of the key parts of the machine tool was carried out,such as the slide board,the spindle box and the column.The assembly position relations and constraints in the whole machine are analyzed.The force is decomposed according to the actual working load of the main shaft.The mechanical analysis model of the parts of the machine tool is obtained.(3)The topology optimization of the slide,the spindle box and the column is carried out under the closed-loop design of the finite element software ABAQUS and the closed-loop design of the optimization software TOSCA.Finally the lightweight design is realized in the condition of static and dynamic stiffness improving.First of all,the original model of the parts should be built.Based on the actual working condition,the boundary conditions and load conditions are applied,and the static analysis and dynamic analysis are carried out.The finite element model is established.The optimization model is established by using TOSCA to carry on the objective function and the constraint conditions.After two optimization processes,the final design structure was obtained.Compared with the original scheme,the good results are obtained,which verifies the operability of the design method in the design of the key structural parts of the machine tool.