Vibration emission as a potential source of information for abrasive waterjet quality process control

Abstract

The paper deals with basic research of vibration generated at abrasive waterjet cutting of materials and their analysis of frequency spectrum in the plane cut. As an experimental material, stainless steel AISI 309 has been used. Experimentally controlled factor involved in the experiment was abrasive mass flow rate with values m a = 250 and 400 g min −1 at a constant traverse speed v= 100 mm min −1 . The vibrations were recorded during experimental cutting by sensors PCB IMI type 607A11 placed on experimental material along the cut at a distance of 50 mm from the cutting plane. Data collection was carried by NI PXI measurement system and frequency analyzer Microlog GX-S. Signal was evaluated by virtual instrument created in the object-programming environment LabView 8.5. Various sizes of amplitudes were observed depending on the distance of abrasive waterjet cutting process from the beginning of the cut. Two peaks of frequency bands have been also found: the first between 500 and 600 Hz and the other at approximately 12.5 kHz. Using this method is possible to ensure the determination of technology efficiency of the material removal process.

Roughness Parameters Calculation By Means Of On-Line Vibration Monitoring Emerging From AWJ Interaction With Material

“…Due to the fact that the material is under erosive influence of AWJ, using the vibration analysis in the case of its application and monitoring material cutting by AWJ appears to be ideal. In the past, some authors published studies presenting applications of vibrations, or acoustic emission, for the purpose of on-line control and monitoring of an instant state of formed cut and its morphology [9,23]. More authors dealt with the issue in the past.…”

Rationalization of manufacturing of plastic injection moulds by abrasive waterjet

“…Reasons for AWJ application consist especially in versatility [3,4] and well-known technological, ecological and economic benefits with a possibility of simple automation of this process [2,10,11,12,15]. Other significant reasons are the accuracy of a cut and little loss of material in the course of this cold process of cutting in comparison with other non-conventional thermal methods, during which a thermally affected zone is formed [2,3,9,10].…”

Identification of the vibration frequency and form of the AWJ machine in aspect of cutter head vibration

“…Wskutek tego mogą powstawać niepożądane drgania, które zmniejszają dokładność obróbki i jakość cięcia. Dlatego jednym z nadrzędnych celów badań prowadzonych w tym zakresie jest analiza własno-ści dynamicznych (parametrów modalnych) konkretnego rozwiązania konstrukcyjnego maszyny do cięcia wysokociśnieniową strugą wodno-ścierną, prowadząca do ujawnienia przyczyn powstawania drgań oraz ich wpływu na sam proces.Obecny stan wiedzy na temat oceny jakości procesu na podstawie analizy drgań opiera się głównie na pomiarze i analizie drgań bezpośrednio w trakcie procesu [1,2]. Towarzyszące procesowi cięcia drgania - ich częstotliwość i amplituda - w dużym stopniu zależą od parametrów cię-cia i grubości przedmiotu obrabianego.…”

“…Obecny stan wiedzy na temat oceny jakości procesu na podstawie analizy drgań opiera się głównie na pomiarze i analizie drgań bezpośrednio w trakcie procesu [1,2]. Towarzyszące procesowi cięcia drgania - ich częstotliwość i amplituda - w dużym stopniu zależą od parametrów cię-cia i grubości przedmiotu obrabianego.…”