重载十字轴式万向节的关键技术及正向设计理论研究
发布时间：2018-12-27 06:59
【摘要】：重载十字轴式万向节是轧钢机主传动系统中的关键部件,通常也是其薄弱部件。重载十字轴式万向节的失效会导致整个主传动系统的破坏,进而导致整个轧钢生产线的停顿,造成巨大的经济损失。因此通过建立重载十字轴式万向节的正向设计理论体系,提高其设计寿命及可靠性具有重要意义。本文在对十字轴式万向节进行运动学分析、动力学分析、结构分析的基础上建立了以避免运动干涉为前提的等强度正向设计理论体系。主要研究内容及成果如下：(1)采用空间投影几何法,建立了双十字轴式万向节的运动方程,并分析了相位角、轴间夹角对瞬时转角差、瞬时转速差的影响以及转动起始位置对转角差的影响,为分析双十字轴式万向节的弹性变形、间隙及制造公差对十字轴式万向节运动特性的影响提供了理论依据。采用空间投影几何法及坐标变换法建立了十字轴式万向节中轴承的运动方程,分析了轴承的运动特性,并证明：主动叉头的轴承的运动特性与从动叉头的轴承运动特性不同,为分析、设计十字轴式万向节的轴承提供了依据。(2)建立了轧钢机主传动系统的扭转振动方程,提出了使用系数KA的概念,并给出了KA的计算方法。采用柔度影响系数法建立了主传动系统的弯曲振动模型,分析了质量偏心及十字轴式万向节的附加弯矩对弯曲振动的影响,并进一步分析了在咬钢和抛钢阶段存在的弯扭耦合振动现象。通过对十字轴式万向节的弯曲振动分析,提出了派生载荷系数KB,并给出了计算方法。采用面向对象的建模法UML建立了轧钢机主传动系统的动力学分析软件的模型,建立了VB.NET和ATLAB之间的混合编程技术,并利用该技术提出该软件平台的快速搭建技术。(4)通过对局部应力集中系数与局部曲率之间关系的分析,提出了应力二次分散方法,用于设计应力集中系数更小的变曲率过渡圆角。采用应力二次分散方法设计了十字轴轴根的变曲率过渡圆角,并利用有限元法验证了变曲率过渡曲线的有效性。此外,采用复合形法编写了设计最优的十字轴轴根的双曲率过渡圆角的程序。(5)通过对十字轴式万向节失效形式的分析,确定了十字轴式万向节的设计准则。通过对主机、负荷进行综合分析,确定了重载十字轴式万向节的载荷系数的确定方法。在考虑叉头及十字轴具体结构的前提下,建立了以避免运动干涉为前提,并满足强度要求的重载十字轴式万向节的正向设计理论。
[Abstract]:Heavy-load cross-shaft universal joint is the key component in the main transmission system of rolling mill. The failure of the overloaded cross shaft universal joint will lead to the destruction of the whole main transmission system, which will lead to the standstill of the whole rolling line and cause huge economic losses. Therefore, it is of great significance to improve the design life and reliability by establishing the forward design theory system of heavy-duty cross universal joint. On the basis of kinematic analysis, dynamic analysis and structural analysis of the cross shaft universal joint, a forward design system of equal strength is established on the premise of avoiding motion interference. The main research contents and results are as follows: (1) the motion equation of double cross universal joint is established by using the space projection geometry method, and the phase angle, the difference of the angle between the axes and the instantaneous rotation angle are analyzed. The influence of the instantaneous rotational speed difference and the initial position of rotation on the rotation angle difference provides a theoretical basis for the analysis of the elastic deformation of the double cross universal joint, the influence of the clearance and the manufacturing tolerance on the motion characteristics of the cross shaft universal joint. The motion equation of the bearing in the cross shaft universal joint is established by using the space projection geometry method and the coordinate transformation method. The motion characteristics of the bearing are analyzed, and it is proved that the motion characteristic of the active fork head bearing is different from that of the driven fork head bearing. For analysis, the design of bearing of cross shaft universal joint is provided. (2) the torsional vibration equation of main transmission system of rolling mill is established, the concept of using coefficient KA is put forward, and the calculation method of KA is given. The flexural vibration model of the main transmission system is established by the flexibility influence coefficient method. The influence of mass eccentricity and the additional bending moment of the cross shaft universal joint on the bending vibration is analyzed. The coupled bending-torsional vibration in the steel biting and throwing stage is further analyzed. Based on the analysis of the bending vibration of the cross shaft universal joint, the derived load coefficient KB, is proposed and the calculation method is given. The dynamic analysis software model of the main transmission system of rolling mill is established by using the object-oriented modeling method UML, and the mixed programming technology between VB.NET and ATLAB is established. By using this technique, the rapid construction of the software platform is proposed. (4) based on the analysis of the relationship between local stress concentration factor and local curvature, a stress quadratic dispersion method is proposed. Used to design transition corners of variable curvature with lower stress concentration factor. Using the stress quadratic dispersion method, the variable curvature transition circular angle of the root of the cross axis is designed, and the validity of the variable curvature transition curve is verified by the finite element method. In addition, the program for designing the optimal double curvature transition angle of the cross shaft root is compiled by using the complex method. (5) by analyzing the failure form of the cross shaft universal joint, the design criteria of the cross shaft universal joint are determined. Through the comprehensive analysis of the main engine and load, the method of determining the load coefficient of the heavy-load cross shaft universal joint is determined. On the premise of considering the concrete structure of fork head and cross shaft, the forward design theory of heavy-duty cross universal joint is established, which is based on avoiding the interference of motion and meeting the requirement of strength.
【学位授予单位】：合肥工业大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TG333;TH133.4
本文编号：2392678
[Abstract]:Heavy-load cross-shaft universal joint is the key component in the main transmission system of rolling mill. The failure of the overloaded cross shaft universal joint will lead to the destruction of the whole main transmission system, which will lead to the standstill of the whole rolling line and cause huge economic losses. Therefore, it is of great significance to improve the design life and reliability by establishing the forward design theory system of heavy-duty cross universal joint. On the basis of kinematic analysis, dynamic analysis and structural analysis of the cross shaft universal joint, a forward design system of equal strength is established on the premise of avoiding motion interference. The main research contents and results are as follows: (1) the motion equation of double cross universal joint is established by using the space projection geometry method, and the phase angle, the difference of the angle between the axes and the instantaneous rotation angle are analyzed. The influence of the instantaneous rotational speed difference and the initial position of rotation on the rotation angle difference provides a theoretical basis for the analysis of the elastic deformation of the double cross universal joint, the influence of the clearance and the manufacturing tolerance on the motion characteristics of the cross shaft universal joint. The motion equation of the bearing in the cross shaft universal joint is established by using the space projection geometry method and the coordinate transformation method. The motion characteristics of the bearing are analyzed, and it is proved that the motion characteristic of the active fork head bearing is different from that of the driven fork head bearing. For analysis, the design of bearing of cross shaft universal joint is provided. (2) the torsional vibration equation of main transmission system of rolling mill is established, the concept of using coefficient KA is put forward, and the calculation method of KA is given. The flexural vibration model of the main transmission system is established by the flexibility influence coefficient method. The influence of mass eccentricity and the additional bending moment of the cross shaft universal joint on the bending vibration is analyzed. The coupled bending-torsional vibration in the steel biting and throwing stage is further analyzed. Based on the analysis of the bending vibration of the cross shaft universal joint, the derived load coefficient KB, is proposed and the calculation method is given. The dynamic analysis software model of the main transmission system of rolling mill is established by using the object-oriented modeling method UML, and the mixed programming technology between VB.NET and ATLAB is established. By using this technique, the rapid construction of the software platform is proposed. (4) based on the analysis of the relationship between local stress concentration factor and local curvature, a stress quadratic dispersion method is proposed. Used to design transition corners of variable curvature with lower stress concentration factor. Using the stress quadratic dispersion method, the variable curvature transition circular angle of the root of the cross axis is designed, and the validity of the variable curvature transition curve is verified by the finite element method. In addition, the program for designing the optimal double curvature transition angle of the cross shaft root is compiled by using the complex method. (5) by analyzing the failure form of the cross shaft universal joint, the design criteria of the cross shaft universal joint are determined. Through the comprehensive analysis of the main engine and load, the method of determining the load coefficient of the heavy-load cross shaft universal joint is determined. On the premise of considering the concrete structure of fork head and cross shaft, the forward design theory of heavy-duty cross universal joint is established, which is based on avoiding the interference of motion and meeting the requirement of strength.
【学位授予单位】：合肥工业大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TG333;TH133.4
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