多曲面段弧面凸轮机构研究与设计
发布时间：2018-10-18 12:00
【摘要】：弧面凸轮机构是高速、高精度间歇分度运动的核心部件,在自动机械的间歇转位中应用广泛,但设计和加工困难,承载力有限。采用多曲面段弧面凸轮能够在一定程度上增加机构重合度,实现负载能力提升。本文在此基础上提出了偏置冗余的概念,在一定程度上降低加工难度,提高加工精度。本课题提出了多曲面段弧面凸轮新设计方法,丰富了弧面凸轮机构设计理论,提高承载能力,降低加工难度。以传统弧面凸轮机构设计理论为依据,通过数学方法精确建模,运用数字化设计方法对其结构进行创新设计。以CAD/CAM技术进行参数化建模,以CAE技术对设计结果仿真分析,通过几种实际案例对多曲面段弧面凸轮机构进行比较,验证设计合理性。对销轴受力及弹性变形校核,通过对从动转盘施加不同力矩探讨销轴最小尺寸。具体研究内容有:(1)应用变换张量、微分几何等数学工具,以成熟的研究成果为基础简要论述了弧面凸轮通用廓面方程及运动规律,并在创新设计中运用。借助Matlab、UG、Ansys Workbench等软件建立不同案例中的三维模型和虚拟装配,再进行仿真分析,验证设计正确性。(2)按照新的设计方法设计几种不同形式的多曲面段弧面凸轮机构,通过运动学仿真对该机构几种不同结构进行设计比较,优化设计。再对销轴和滚子等零部件运用CAE工具进行弹性力学分析,结合实验数据分析计算,给出销轴和滚子的设计尺寸参考标准,为多曲面段弧面凸轮机构的设计与参数选择提供理论依据与研究方法。(3)根据几组不同类型的弧面凸轮机构销轴受力分析,验证设计案例中偏置式冗余弧面凸轮机构能够有效提高承载能力。通过对仿真结果分析计算,论证偏置式冗余弧面凸轮机构的运动学和动力学性能及受力情况。(4)将采用上述方法设计的偏置式冗余弧面凸轮机构运用于凸轮分割器的设计中,根据机械设计手册设计各零部件结构及尺寸,建立三维模型,通过虚拟装配校正设计,再经过仿真分析优化设计。绘制二维零件图、装配图,为下一步试加工做准备。
[Abstract]:The globoidal cam mechanism is the core component of high speed and high precision intermittent indexing motion. It is widely used in the intermittent transposition of automatic machinery, but it is difficult to design and process, and its bearing capacity is limited. The multi-curved globoidal cam can increase the coincidence degree of the mechanism to a certain extent and enhance the load capacity. In this paper, the concept of bias redundancy is put forward to reduce machining difficulty and improve machining precision to some extent. In this paper, a new design method of multi-curved globoidal cam is proposed, which enriches the design theory of globoidal cam mechanism, improves the bearing capacity and reduces the processing difficulty. Based on the traditional design theory of globoidal cam mechanism, the mathematical method is used to model the cam mechanism accurately, and the digital design method is used to design its structure innovatively. Parameterized modeling based on CAD/CAM technology, simulation analysis of design results by CAE technology, comparison of multi-curved globoidal cam mechanism with practical cases are carried out to verify the rationality of the design. The minimum size of the pin shaft is discussed by applying different torque to the follower rotary disc by checking the force and elastic deformation of the pin shaft. The specific research contents are as follows: (1) by using transformation Zhang Liang, differential geometry and other mathematical tools, the general profile equation and motion law of globoidal cam are briefly discussed on the basis of mature research results, and applied in innovative design. The 3D model and virtual assembly in different cases are built with the help of Matlab,UG,Ansys Workbench software, and then the simulation analysis is carried out to verify the correctness of the design. (2) according to the new design method, several kinds of multi-curved globoidal cam mechanisms are designed. Through kinematics simulation, several different structures of the mechanism are designed and compared to optimize the design. Then the elastic mechanics analysis of the parts such as pin shaft and roller is carried out by using CAE tool, and the design dimension reference standard of pin shaft and roller is given according to the analysis and calculation of experimental data. It provides a theoretical basis and research method for the design and parameter selection of multi-curved globoidal cam mechanism. (3) according to several groups of different types of globoidal cam mechanism pin force analysis, It is verified that the offset type redundant globoidal cam mechanism can effectively improve the bearing capacity in the design case. Through the analysis and calculation of the simulation results, the kinematics and dynamics of the offset redundant globoidal cam mechanism and its force are demonstrated. (4) the offset redundant globoidal cam mechanism designed by the above method is applied to the design of the cam splitter. According to the mechanical design manual, the structure and dimensions of each component are designed, and the three-dimensional model is established. Draw two-dimensional part drawing, assembly drawing, prepare for the next trial processing.
【学位授予单位】：陕西科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH112.2
本文编号：2279060
[Abstract]:The globoidal cam mechanism is the core component of high speed and high precision intermittent indexing motion. It is widely used in the intermittent transposition of automatic machinery, but it is difficult to design and process, and its bearing capacity is limited. The multi-curved globoidal cam can increase the coincidence degree of the mechanism to a certain extent and enhance the load capacity. In this paper, the concept of bias redundancy is put forward to reduce machining difficulty and improve machining precision to some extent. In this paper, a new design method of multi-curved globoidal cam is proposed, which enriches the design theory of globoidal cam mechanism, improves the bearing capacity and reduces the processing difficulty. Based on the traditional design theory of globoidal cam mechanism, the mathematical method is used to model the cam mechanism accurately, and the digital design method is used to design its structure innovatively. Parameterized modeling based on CAD/CAM technology, simulation analysis of design results by CAE technology, comparison of multi-curved globoidal cam mechanism with practical cases are carried out to verify the rationality of the design. The minimum size of the pin shaft is discussed by applying different torque to the follower rotary disc by checking the force and elastic deformation of the pin shaft. The specific research contents are as follows: (1) by using transformation Zhang Liang, differential geometry and other mathematical tools, the general profile equation and motion law of globoidal cam are briefly discussed on the basis of mature research results, and applied in innovative design. The 3D model and virtual assembly in different cases are built with the help of Matlab,UG,Ansys Workbench software, and then the simulation analysis is carried out to verify the correctness of the design. (2) according to the new design method, several kinds of multi-curved globoidal cam mechanisms are designed. Through kinematics simulation, several different structures of the mechanism are designed and compared to optimize the design. Then the elastic mechanics analysis of the parts such as pin shaft and roller is carried out by using CAE tool, and the design dimension reference standard of pin shaft and roller is given according to the analysis and calculation of experimental data. It provides a theoretical basis and research method for the design and parameter selection of multi-curved globoidal cam mechanism. (3) according to several groups of different types of globoidal cam mechanism pin force analysis, It is verified that the offset type redundant globoidal cam mechanism can effectively improve the bearing capacity in the design case. Through the analysis and calculation of the simulation results, the kinematics and dynamics of the offset redundant globoidal cam mechanism and its force are demonstrated. (4) the offset redundant globoidal cam mechanism designed by the above method is applied to the design of the cam splitter. According to the mechanical design manual, the structure and dimensions of each component are designed, and the three-dimensional model is established. Draw two-dimensional part drawing, assembly drawing, prepare for the next trial processing.
【学位授予单位】：陕西科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH112.2
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