Fluid-structure Interaction Research On Thermal Field Of The Key Components Of Heavy-duty CNC Horizontal Boring Lathe

As a large size rotary curved surface parts of the main processing equipment, heavy-duty CNC horizontal boring lathe has a pivotal position in heavy manufacturing industry. Because of the huge machine tool and workpiece, large load changes, large travel and other characteristics, heavy-duty horizontal boring lathe is more easily affected by rotation speed and environmental factors. While the main axle box, working table, base and guide as the key components of heavy-duty CNC horizontal boring lathe, they are easy to produce thermal errors in the operation process, reduce the machining accuracy of machine tool.Therefore, the study of the key components of heavy-duty CNC horizontal boring lathe thermal field has important significance.In this thesis, heavy duty CNC horizontal boring lathe developed by qiqihar heavy CNC equipment co., LTD. is the research object. The influence of the speed and environmental temperature on the key components of heavy-duty machine tool thermal field is researched. The research of heat transfer and heat dissipation of heavy machine tool at home and abroad is summarized. using fluid solid coupling method, thermal field simulation of the numerical heavy-duty CNC horizontal boring lathe key components is simulated to study speed and environmental temperature on the key components of the machine tool temperature field, heat transfer and heat dissipation and the influence of thermal deformation.First of all, based on the basic theory of heat transfer, adopting the descartes coordinates and the cylindrical coordinate system, six surface element and arc element are used as material unit. The differential equation of heat conduction to push the key components of the general form is derived, at the same time, the thermal boundary conditions are determined.Then, the heating mechanism of each part is analyzed. The numerical heat of the main heating part is calculated. The key components of heavy-duty horizontal boring lathe three-dimensional solid domain model and the model of the fluid domain are bulit by using Siemens NX software. According to the actual conditions, spindle box, table, bed, the base model are reasonably simplified. The three-dimensional models of solid and fluid domains are imported into the finite element analysis software and divided into the grid and set the material properties.Finally, finite element analysis model is simulated by fluid-solid interactioning in speed of 10, 20, 30, 40, 50 rpm, environment temperature for 5, 10, 15, 20, 25°C condition. Through the numerical simulation of different rotation speed and temperature, the temperature field and air flow distribution of key components are obtained. And the temperature distribution of the key parts of heavy-duty CNC horizontal boring lathe under different working conditions are revealed. By analyzing the convection heat transfer coefficient on the surface of the working table, the impact of heat speed and environmental temperature on the working table are obtained. Further, the thermal deformation of the key components under different conditions is obtained, which provides the theoretical basis for the design and optimization of the key parts in the similar heavy duty boring machine.