| Globoidal indexing cam mechanical is one of the intermittent transmission mechanical which applied to two axes of upright interleaving. Because of its high precision of orientation and reliability of transmission, globoidal indexing cam mechanical is widely used in automatic manufacturing processes. Typical applications can be found in conveyors, machine tools,press feed mechanisms, and assembly system. Being spatial surface that can't been outspreaded, the surface of globodial indexing cam can't been mapped through general method or designed by the method of outspread into plane. Its complex profile and cumbersome design process prevents it from further development. In this paper, based on the conjugate surfaces theory, the surface equation of the globodial cam, conjugate equation and the formula of pressure angle are established by applying the homogeneous coordinate transformation method. The mesh characteristic of the mechanism is deeply researched in this paper, such as two circumscription curves which judge if the conjugate surface could mesh properly , its principal curvature, the tooth profile in axial section and normal section. Some calculate examples and conclusion are given. The cause of the cam profile error is analysed and The manufacturing method of off-set compensation for tool path and the theoretical error in this method is introduced in this paper. Using MATLAB to calculate the theoretical errors in the manufacturing method of off-set compensation for tool path of globoidal indexing cam. Given the theoretical errors, the maxim radius of cutter is calculated by using MATLAB. The three-dimension design of globoidal indexing cam is done by Pro/Engineer. The data of the Profile is obtain by using Visual C++, and the three-dimension model of globoidal indexing cam is create through the powerful surface molding function of Pro/Engineer. Compared with the object, it is proved that the equation and the three-design of the globoidal cam are correct. |
PDF Full Text Request