Desenvolvimento de uma estratégia de medição, baseada em nurbs, para determinação do desvio total de perfil (fα) de engrenagens cilíndricas de dentes retos usando MMCs

Abstract

For many years the power transmission and movement for gears has been an important technology in the automotive, mechanical and aeronautical industries, justifying the considerable number of research carried out under the quality control of these components. Nowadays, involute profile inspections of cylindrical gears have been carried out using CNC Coordinate Measuring Machines (CMMs) with rotary tables and dedicated measurement software, equipped with contact scanning sensors, Touch Trigger Probes – TTP or non-contact, Laser. However, many companies that manufacture and inspect gears use manual CMMs with point to point sensors, thus being unable to issue the profile deviation report. In respect, the motivation for this research is to develop and validate inspection strategies for determining the Total Profile Deviation (Fα) of spur gears, according to ISO 1328, using of a mathematical tool NURBS (Non-Uniform Rational B-Splines) and CMMs manual. Strategies for changing the NURBS weight parameter wi also were applied to assist in inspection definition procedure, and this is one more degree of freedom. In the first moment, before the execution of experimental procedures, simulations were carried out on a computational system and showed satisfactory results. For the experimental tests, a manual CMM MICRO-HITE 3D model was used with point to point sensor. Simulations and experimental results showed that the NURBS technique contributes to manual CMM application using Touch Trigger Probes in measuring the spur gears involute profile. The experimental results showed the methodology efficacy.