Study on Machining Error of Globoidal Cam Profile Resulting from Rotational Deviation of Location of Part in Machining

Abstract

The profile error of a globoidal cam, resulting from rotational deviation of the location of the part in machining on a NC machine tool which has two coordinated rotational axes, is studied. A novel method of solving profile error is presented. According to this method, the minimum distance from a point on the profile actually machined to the desired profile is referred to as the profile error. Then, the mathematic model of profile error resulting from the rotational deviation of the part to be machined is built. After that, the type TC40 globoidal cam is employed as an example to solve the machining error. And the experiment of machining a globoidal cam is done. The experimental result is compared with the computed result, and they are mostly identical.

Analysis and Detection Method for Machining Error of Globoidal Indexing Cam Profile

“…Adding the equation 9, (10) to the equation (11), (12), the error model of globoidal indexing cam profile could be obtained.…”

“…ΔL=D tmax -D tmin =0.043-(-0.01)=0.057mm (10) Therefore, the line profile tolerance of the characteristic line under the cam angle is ΔL=0.057mm. The measuring precision of the globoidal cam intermittent section is pretty high, the tolerance between each point is rather small, and it proves that the measuring method of the equidistant model is suitable for the intermittent section.…”

“…Ji Shuting [8] [9] from Beijing University of Technology researches on the influence caused by center distance error of the globoidal indexing cam special machining on the cam profile machining error and draws the influence coefficient curve, she reveals the result that the center distance error leads to the error of globoidal indexing cam profile. On the basis of the above research, the influence caused by two rotation shaft errors, three vertical errors and three linear displacement errors of globoidal indexing cam special machining on the machining error of globoidal indexing cam profile have been analyzed [10]. Wang Haiyan puts forward two kinds of scanning measuring method [11] for measuring the globoidal cam by applying of CMM.…”