金刚石圆锯片的力学性能研究及工艺优化

发布时间：2018-06-03 13:51

本文选题：金刚石圆锯片 + 仿真分析　；参考：《济南大学》2017年硕士论文

【摘要】：金刚石圆锯片作为一种切割工具,广泛应用于混凝土、耐火材料、石材,陶瓷等硬脆材料的加工。但由于其超薄的结构,工作时在外力的作用下极易发生轴向变形,甚至断裂;另外圆锯片在工作时所产生的噪声也会对环境造成极大的危害。本文主要对圆锯片的平面应力、动态特性以及加工工艺进行研究,主要内容包含以下方面:对金刚石圆锯片的几种平面应力进行了理论研究,主要分为五部分:离心力的理论研究、锯切力的理论研究、热应力的理论研究、适张应力的理论研究和回火应力的理论研究。分析了它们对圆锯片稳定性的影响,从而为第三章的有限元仿真分析和圆锯片的结构优化提供理论支持。利用有限元软件ANSYS Workbench对圆锯片进行静力学与热力学仿真,得到圆锯片在仅受离心力、锯切力、热载荷和三种载荷共同作用下的变形和应力分布的规律,并以此为依据,对圆锯片的径向槽进行结构优化,把槽的底孔半径、槽深、槽宽和槽的倾斜角作为变量,对圆锯片进行热力耦合分析,得到径向槽最优的结构参数,从而提高圆锯片的力学性能。对金刚石圆锯片进行动态特性分析,确定其固有频率和各阶阵型,并分析了影响锯片动态特性的主要因素(如预应力、法兰盘直径、基体厚度);并对开圆形降噪孔锯片、复合型锯片的振动特性进行了研究,以此对开圆形降噪孔锯片的孔径大小、分布位置及圆孔数量进行了优化,确定了复合型圆锯片的夹层阻尼材料类型与最佳夹层厚度,并将优化后的复合型圆锯片与普通圆锯片进行振动衰减实验对比,结果表明:复合片的振动强度与衰减时间与常规锯片相比有大幅度减小,从而为圆锯片的减振降噪设计提供技术支撑。基于目前对复合型圆锯片制造工艺的分析,结合优化后的复合型圆锯片的结构特点,对其中的关键工序(如点焊、热处理、磨削等)的工艺参数及加工方式进行优化,并探讨了上述关键工序的加工控制要求。
[Abstract]:As a cutting tool, diamond circular saw blade is widely used in the processing of hard and brittle materials such as concrete, refractory, stone and ceramics. However, due to its ultra-thin structure, axial deformation and even fracture occur easily under the action of external force, and the noise produced by circular saw blade will also cause great harm to the environment. In this paper, the plane stress, dynamic characteristics and processing technology of circular saw blade are studied. The main contents are as follows: the theoretical study of several kinds of plane stress of diamond saw blade is carried out. It is mainly divided into five parts: the theoretical study of centrifugal force, the theoretical study of sawing force, the theoretical study of thermal stress, the theoretical study of tensile stress and the theoretical study of tempering stress. The influence of them on the stability of circular saw blade is analyzed, which provides theoretical support for the finite element simulation analysis and structural optimization of circular saw blade in chapter 3. The static and thermodynamic simulation of circular saw blade is carried out by using finite element software ANSYS Workbench, and the law of deformation and stress distribution of circular saw blade under the action of centrifugal force, sawing force, thermal load and three kinds of load is obtained. The structure of radial slot of circular saw blade is optimized. The radius of bottom hole, depth of slot, width of slot and inclined angle of slot are taken as variables. The thermodynamic coupling analysis of circular saw blade is carried out, and the optimum structural parameters of radial slot are obtained. Thus, the mechanical properties of circular saw blade are improved. The dynamic characteristics of diamond circular saw blade are analyzed, and the natural frequency and each order formation are determined. The main factors influencing the dynamic characteristics of the saw blade (such as prestress, flange diameter, matrix thickness) are analyzed, and the circular noise-reducing hole saw blade is also analyzed. The vibration characteristics of the composite saw blade are studied in order to optimize the aperture size, distribution position and the number of circular holes of the circular saw blade, and to determine the type of sandwich damping material and the optimum thickness of the sandwich for the composite circular saw blade. The results show that the vibration intensity and attenuation time of the composite saw blade are much smaller than that of the conventional saw blade, and compared with the conventional saw blade, the vibration attenuation of the composite saw blade is compared with that of the conventional saw blade, and the results show that the vibration intensity and attenuation time of the composite saw blade are greatly reduced. Thus provides the technical support for the circular saw blade vibration and noise reduction design. Based on the analysis of the manufacturing process of the composite circular saw blade and the structural characteristics of the optimized composite saw blade, the process parameters and processing methods of the key processes (such as spot welding, heat treatment, grinding, etc.) are optimized. The process control requirements of the key processes mentioned above are also discussed.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG717

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