The Profile Determination and Machining of Camoids with Oscillating Spherical Followers

Abstract

A simple procedure, that can be used to determine the complicated camoid profile with an oscillating spherical follower and to decide the cutter path with the predictable surface roughness, is presented. In the profile design stage, it employs the theory of envelope for a family of surfaces with two independent parameters to derive the camoid contour. Also, the pressure angle is investigated by means of the analytical expression of the camoid. The results are compared to those obtained by using the principle of contact point between the camoid and the follower. Based on the chordal deviation and the scallop height, the surface roughness is analyzed in the machining process. An example is given to illustrate the application of the proposed method.

Contact Stress Reduction Mechanisms for the CAM-Based Infinitely Variable Transmission

“…The cam profile generation algorithm is almost identical to the internal cam; the same follower envelope equations were used with only a sign change as described in Tsay [8]. To maintain the correct follower rotation direction and force, the rollers now lead the follower, as opposed to trailing.…”

The Operation and Kinematic Analysis of a Novel CAM-Based Infinitely Variable Transmission

“…The cam is designed such that ω p increases linearly along its lengths, and therefore, the magnitude of the follower motion increases linearly as well, which generates the ruled surface seen in Figure 7. From this surface, the cam shape can be found using either the envelope theory for two surfaces [12], or the point of contact theory [13].…”

Generation of Five-Axis Cutter Paths for a Ball-End Cutter With Global Interference Checking

“…To efficiently machine turbomachinery components such as centrifugal compressors, axial compressors, and fans having complex, overlapping surface geometries, five-axis numerically controlled (NC) machine tools possessing many degrees of freedom are necessarily utilized. To produce such components with desired precision, correct cutter contact (CC) data must first be generated considering the scallop height (Kim and Chu, 1994;Tsay and Hwang, 1994), overcutting, and local gouging (Oliver et al, 1993) of the part surfaces. More importantly, before machining, the possibility of tool interference must be avoided so that proper cutter location (CL) data can be decided and tool paths can be schemed.…”

“…By five-axis surface machining, Choi et al (1993) generated CL data from the given CC paths to give minimum cusp heights. Also, based on the chordal deviation and the scallop height, the surface roughness was analyzed in the machining process (Tsay and Hwang, 1994). Recently, based on the constant scallop height, Suresh and Yang (1994) represented a method to generate the tool paths.…”