弧面分度凸轮机构动态特性的研究
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摘要
在利用双三次B样条曲面算法建立出弧面凸轮机构三维模型的基础上,结合ADAMS软件建立刚柔耦合动力学模型,并对其进行运动学分析,验证模型的正确性。同时,对机构进行不同运动参数下的仿真分析,得到不同参数情况下角加速度、接触力的变化曲线图。通过对变化曲线图的分析,转速和阻尼系数对弧面分度凸轮的动态特性都有影响。尤其在分度期间,影响最为明显。随着弧面分度凸轮转速的提高,分度盘角速度和接触力都呈现逐步增大的趋势。随着阻尼系数值的增大,分度盘的最大角加速度值将会先减小(在150N·s/mm处达到最小)再增大。而滚子与分度盘之间的接触力会随着阻尼系数的增大而上升。
Globoidal indexing cam mechanism is one of indexing mechanism with excellent performance.It has the advantages of high speed,large stiffness and strong bearing capacity.In this paper,based on the three-dimensional model of globoidal cam mechanism established by bi-cubic B-spline surface algorithm,a rigid-flexible coupling dynamic model is established with ADAMS software,and its kinematics analysis is carried out to verify the correctness of the model.Meanwhile,the mechanism is simulated and analyzed under different motion parameters,and the curves of angular acceleration and contact force under different parameters are obtained.The analysis of the curve of angular acceleration and contact force shows that the rotational speed and damping coefficient have influence on the dynamic characteristics of globoidal indexing cam.Especially during the grading period,the impact is most obvious.With the increase of the rotational speed of globoidal indexing cam,the angular speed and contact force of indexing-plate increase gradually.With the increase of the damping coefficient,the maximum angular acceleration of the indexing plate will decrease first(minimum at 150 N·s/mm)and then increase,while the contact force between the roller and the indexing plate will increase with the increase of the damping coefficient
Globoidal indexing cam mechanism is one of indexing mechanism with excellent performance.It has the advantages of high speed,large stiffness and strong bearing capacity.In this paper,based on the three-dimensional model of globoidal cam mechanism established by bi-cubic B-spline surface algorithm,a rigid-flexible coupling dynamic model is established with ADAMS software,and its kinematics analysis is carried out to verify the correctness of the model.Meanwhile,the mechanism is simulated and analyzed under different motion parameters,and the curves of angular acceleration and contact force under different parameters are obtained.The analysis of the curve of angular acceleration and contact force shows that the rotational speed and damping coefficient have influence on the dynamic characteristics of globoidal indexing cam.Especially during the grading period,the impact is most obvious.With the increase of the rotational speed of globoidal indexing cam,the angular speed and contact force of indexing-plate increase gradually.With the increase of the damping coefficient,the maximum angular acceleration of the indexing plate will decrease first(minimum at 150 N·s/mm)and then increase,while the contact force between the roller and the indexing plate will increase with the increase of the damping coefficient
引文
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[12]文怀兴,上燕燕,魏乾新.弧面分度凸轮机构的设计装配及运动仿真[J].机械传动,2013,37(12):77-79.
[2]张兴钰,葛正浩,李成平,等.基于刚柔耦合模型的弧面分度凸轮机构动力学分析[J].机械传动,2016(1):136-139.
[3]冯立艳,周新磊.基于ADAMS弧面凸轮机构运动学分析和仿真[J].山东工业技术,2016(1):231-232.
[4]刘言松,贺炜.弧面分度凸轮机构动力学仿真[J].现代制造工程,2006(1):118-216.
[5]LIVIJA Cveticanin.Stability of motion of the cam-follower system[J].Mechanism and Machine Theory,2007,42(9):1 238-1 250.
[6]林新贵,詹欣荣.包装机空间圆柱凸轮的设计及数控加工工艺研究[J].组合机床与自动化加工技术,2016(7):131-134.
[7]ANDRESEN Uif,SINGHOSE William.A simple procedure for modifying high-speed cam profiles reduction[J].ASMEJournal of Mechanical Design,2004,126(6):1 105-1 108.
[8]DAS Gupta Anirvan,GHOSH Amitabha.On the determination of basic dimensions of a cam with a translating roller-follower[J].ASME Journal of Mechanical Design,2004,126(1):143-147.
[9]NAYAK N,LAKSHMINARAYANAN P A,BABU M K.Predictions of cam follower wear in diesel engines[J].Wear,2006,260(1):181-192.
[10]张伟杰,付晓莉.弧面分度凸轮的三维建模与运动学分析[J].煤矿机械,2016,37(3):64-66.
[11]张文光,王大镇,弓清忠.采用SolidWorks的弧面分度凸轮三维造型设计及运动仿真分析[J].现代制造工程,2014(10):90-94.
[12]文怀兴,上燕燕,魏乾新.弧面分度凸轮机构的设计装配及运动仿真[J].机械传动,2013,37(12):77-79.