文档介绍：湘潭大学
硕士学位论文
连续分度弧面凸轮的多轴数控加工理论研究
姓名:漆瑞
申请学位级别:硕士
专业:机械制造及其自动化
指导教师:胡自化
20050509
符号说明表
C——从动盘至凸轮的中心距
β——描述滚子曲面参数上的共轭接触点的曲面坐标,称之为接
触角
l ——从动盘中心到滚子内端面的距离
r ——滚子半径
h ——滚子曲面参数,从滚子内端面到接触点的距离,称之为啮
合深度
i ——传动比,i = Z1 / Z 2 ,Z1 为从动盘的滚子数,Z 2 为弧面凸轮的
头数
θ1 ——从动盘的角位移
θ 2 ——凸轮的角位移
α——压力角
1
k1 ——滚子曲面的第一主曲率
2
k1 ——滚子曲面的第二主曲率
m
k12 ——连续分度弧面凸轮机构的诱导主曲率
T1 ——从动盘的输出扭矩
T2 ——凸轮的输入扭矩
n1 ——从动盘的输出转速
n2 ——凸轮的输入转速
P1 ——从动盘输出功率
P2 ——凸轮的输入功率
η——连续分度弧面凸轮机构传动的总效率
Fn ——滚子或凸轮所受的法向力
l f ——从动盘中心到节点的距离,称之为从动盘节圆半径
mg ——传动时同时啮合的最少滚子数
69
Abstract
At present, NC rotary tables made in our country are normally
equipped with worm gear mechanisms, which have bigger clearances
in positive and negative directions and worse resisting torque ability
at work. Moreover, because of the laggard technical means of
manufacturing and assembly, the homemade NC rotary tables are not
very good in the respects of indexing accuracy, repeated indexing
accuracy and load capacity. Because continuous indexing globoidal
cam mechanisms hold the advantages of big torque, high accuracy,
small volume, light weight, nice transmission efficiency and so on,
and can take the place of worm gears to a certain extent. Therefore, it
is very significant to try to develop this new type of driving
mechanisms, the continuous indexing globoidal cams. According to
the research on this type of driving mechanisms, the main work of the
paper is as follows:
(1) Designing: the paper firstly deduces the important formulas
for continuous indexing globoidal cams, such as profile equation,
meshing equation, pressure angle and curvature equations, and also
analyzes the changes of pressure angle and curvature. Then a
designing method for continuous indexing globoidal cams is summed
up, and the corresponding interactive designing program is
established too. At last, the motion simulation for the mechanism is
carried out by UG CAD/CAM software, which v