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金刚石框架锯动态特性研究及关键结构优化
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摘要
金刚石框架锯具有加工效率高、加工质量好、环境污染小的优点,成为大理石大板最主要的加工设备之一。目前金刚石框架锯技术有了长足进步,但也存在明显的整机结构较笨重、关键构件结构不合理、锯机设计缺少理论指导等问题。同时大理石大板的应用量大,质量要求高,这对锯机性能提出了更高的要求。因此需要深入分析锯机动态性能,并作优化设计。
     本文对国内外主要金刚石框架锯结构与技术特点进行了系统分析,结合目前金刚石框架锯机的研究现状及存在问题,对锯机进行了模块化设计,建立了金刚石框架锯虚拟样机模型。对已经生产出的金刚石框架锯样机进行动态运动学与动力学理论与仿真分析,并进行了对比,两种分析结果基本吻合,得到曲柄连杆机构主要部件的运动学规律,以及受力变化等动力学性能,明确了金刚石框架锯的动态特性。
     运用ADAMS对金刚石框架锯曲柄连杆机构进行参数化建模,以部件受力最小为优化目标,分析了飞轮转速、曲柄长度及连杆长度等影响因素对目标函数的影响,并对它们进行了优化,得到了最佳的飞轮转速与连杆长度等技术参数。
     对金刚石框架锯锯框、连杆及飞轮等部件进行了结构与尺寸优化。利用ANSYS Workbench Environment (AWE)协同优化分析平台对部件强度及受力变形影响因素进行了分析,确定了优化方法,得到了优化结果。对新结构进行了静动态性能分析,并进行了强度校核。经过优化的部件质量减轻,运动过程中受力减小。
     金刚石框架锯经过动态特性分析以及关键部件优化设计,最终得出新型锯机模型。新型锯机总体质量减小,部件受力减小,可靠性更强。锯机运动更加平稳,板材加工质量好。新型锯机提高了市场竞争力,促进了大理石板材加工业的发展。
As diamond frame gang saw has the advantage of high efficiency and quality, producing less production waste, it becomes one of the uppermost machines for manufacturing big marble slab. Currently, diamond frame gang saw technology has a big advancement, but it still has many problems, such as machine structure is too ponderosity, key component structure is not in reason, and equipment design is lack of academic guidance. At the same time, as the requirement and quality of big marble slab become more and more high, the properties of the equipment needs more stringent requirements, so it is needed to lucubrate dynamic properties of the equipment, and to optimize the structure of the equipment.
     According to the principle analysis of diamond frame gang saw in and out of China, including current research and questions of the equipment, modularize design the equipment, and establish the diamond frame gang saw virtual prototype. Kinematics and dynamics theory analysis and simulation analysis are carried on for the diamond frame gang saw. According to the accordant result, get kinematics disciplinarian and dynamics performance of the key parts of the crank-link mechanism.
     Parametric establishe the gangsaw virtual prototype using the ADAMS, set the minimum force of parts as objective function, investigate the influence of paramerters such as rotating speed of flywheel, length of brace and connecting rods, establish the optimize method, figure out the best rotating speed of flywheel and lenth of brace and connecting rods.
     Optimize the structre and dimension of blade holder frame, connecting rods and flywheel, investigate the influence of paramerters to intensity and force of assembly based on ANSYS Workbench Environment (AWE), establish the optimize method, figure out the best result. The static and dynamic performance of new structer is analysed using FEM, the intensity is also checked. After optimization, the mass of new assembly is abated, the force reduced during movment progress.
     After dynamic anaslysis and optimization design, the new mashine is finished. The mass of new diamond frame gang saw is abated, and force is abated, configuration is more reasonable. The mashine operates more reposefully, and quality of manufacturing big marble slab is higher. The new machine improves its market competitive ability, which is propitious to the development of diamond frame gang saw.
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