Processo de brunimento em camisas de cilindro de motores de combustão interna: uma análise do escoamento e circularidade dos cilindros

Abstract

The service companies that specialize in engine overhauling are of great importance to the automotive industry. These companies perform maintenance on engines to repair regular, use-related damages, extending its service life. One of the mostimportant parts of an internal combustion engine is the cylinder liners, which, along with the pistons, delimit the combustion chamber. One of the processes used in engine overhauling is burnishing, a machining process that is used to repair the cylinder liners so they retain the specifications required for the engine to function. This paper’s goal is to analyze the angles of grooves left by the burnishing process on different cylinders of an internal combustion engine, as well as their circularity, to obtain optimal oil flow. This engine has four cylinders, and each cylinder was burnished in different progress speeds. They each went through a metrology process afterwards so circularity errors created during engine overhaul could be analyzed. A flow analysis was also performed. The results obtained through the individual analysis of each cylinder have provided different flow values that can be compared to the progress speed of each cylinder and the angles of the groove intersections made by the burnishing machine. It was concluded that the burnishing study performed presented irregularities, which call for improvements in order to obtain more satisfactory results. For future papers, it could be best to switch to a variable rotation burnishing machine instead, which would provide greater precision