Studium vlivu technologie pulzujícího vodního paprsku na povrch materiálu

Abstract

Last thirty years, technology of high speed liquid jets has gone through unprecedented expansion and it has been applied in almost all industrial sectors as a universal unconventional technology. However, the research into properties and behavior of liquid jets and their further development continue with the same intensity. Pulsating water jets represent one of new directions which the research focuses on. It is expected that these jets will be applied in the construction and mechanical engineering, most especially in the automotive and aviation industries. The thesis studies the effect of the pulsating water jet impacting the surface of a material. The theoretical part focuses on the development of liquid jets, classification of particular liquid jet types and their commercial application. Individual parts of the high pressure chain which are essential for the generation of pulsating water jet are presented. In addition, the principle of pulsating water jet impact on the surface of a machined material, including mechanisms of disintegration, is described in the theoretical part. The experimental part consists of the design and description of tests of disintegration of selected metal materials (stainless steel, aluminium alloy and copper) with the pulsating water jet, including consequent evaluation of individual measurements. The first part deals with experimental determination of erosive effects of the pulsating water jet. In the following part, effect of individual technological factors of the jet on the studied surface is analyzed using the so-called Design of Experiments. Particular roughness parameters and the volume of material removal were selected in order to determine the effect of the pulsating water jet on a machined material.