Structural Characteristics Analysis And Optimization Based On The Key Parts Of A Cylinder Liner Vertical Lathe

Cylinder liner is one of the components which bear the heaviest friction burden of the Maine diesel engine. Its processing quality is directly related to the working conditions and service life of diesel engine. There are special requirements on machine tool structure when processing cylinder with the largest diameter of1200mm, and maximum height of2500mm. So it is needed to improve or redesign the key parts base on the original machine tool. In the process of cylinder liner machining, key parts of the machine tool undergo various of loads such as cutting force, harmonic excitation force and others, therefore its structural properties like strength, stiffness and anti-vibration performance will directly affect the machining quality of the cylinder liner.Based on the Theory of Elastic Mechanics and Finite Element theory, with ABAQUS and Hyper Works two optimization software as finite element analysis tool, this paper is to analyze and streamline research on the structural characteristics of the required key machine tool parts during large marine liner machining. The concrete research content is as follows:(1) Analyze demand of machine tool’s structural characteristics for large Marine liner, determine the machine structure and build a3D model of the machine as well as a2D chart.(2) Utilize ABAQUS to execute statics analysis when the machine slippery pillow was with different quantity of overhanging. Get the stress nephogram and the Usum of the loaded slippery pillow. And use Matlab to fit out the relation curves between the static stiffness, the maximum stress, the strain-displacement and between the quantities of overhanging. Get the strength and stiffness status of the slippery pillow, find out the problems existed in the structure, provide references for the machine design and optimization of the component structure.(3) Carry on a research on the dynamic characteristics of the portable beam structure based on ABAQUS. The mainly research content includes the modal analysis and harmonic responses analysis to get the first ten degrees’natural frequency, vibration modal distribution and steady-state and dynamic response after exciting force of the portable beam structure Then, compare the natural frequency with the power-plant’s vibration frequency of the machine tool, and provide references for the design of displacement anti-resonance of the portable beam structure. Finally calculate the dynamic stiffness of the movable beam according to the maximum response displacement from the harmonic response analysis. Simultaneously, find out the to-be-avoided excitation frequency band during the machine tool processing.(4) Utilize HyperWorks’structure optimization module OptiStruct, to execute size optimization and topology optimization on the slippery pillow in order to improve its static stiffness, and determine the final structure of the slippery pillow. Meanwhile, the structure was analyzed before and after optimization, to verify the reasonableness of optimized structures. Finally, measuring the straightness and roundness of the cylinder inner hole, inspection machine tool processing performance after optimization.