Abstract
The aim of this paper is to make a research in order to analyze the modification of the microgeometry parameters of AWJ machined surfaces for a ductile material used in oilfield and petrochemical equipment. Experimental research was performed on waterjet cutting machine model YCWJ-380-1520 using pre-establish working conditions. The SURTRONIC 3+ device was used in order to measure the microgeometry characteristics of the machined surfaces. Experimental tests were performed regarding some values for: material thickness, working feed-rate and standoff distance. The obtained outcomes highlighted that there are three zones on cutting surfaces for thick material and only two zones for thin materials. There are a lot of profile parameters provided by the software and there were taken into account only the average roughness (Ra) and average waviness (Wa). For each of those two parameters were accomplished graphical representation for every working parameters in order to establish an analytical dependence between them. The outcomes which were obtained are polynomial four order equations of average roughness and waviness according to standoff distance. The analytical relations obtained give us the possibility to estimate the average roughness of the surfaces related to thickness, feed-rate and standoff distance.
Highlights
The aim of this paper is the study of microgeometry obtained on the kerf surfaces generated by the AWJ process, machining a soft alloyed steel used in oilfield and petrochemical equipment
At the outlet of the focusing tube, the maximum value of water velocity obtained by CFD simulation on the active parts of AWJ machine is about 187.5m/s
The maximum values of average roughness (Ra) are obtained on the inferior zone and the minimum values are obtained on the superior zone
Summary
The aim of this paper is the study of microgeometry obtained on the kerf surfaces generated by the AWJ process, machining a soft alloyed steel used in oilfield and petrochemical equipment. The study of kerf microgeometry is made in the framework of the experiments using AWJ machine WUXI YCWJ-380-1520, presented in fig.. The study of kerf microgeometry is made in the framework of the experiments using AWJ machine WUXI YCWJ-380-1520, presented in fig.1 This machine is made up by the follows: machine table (known as machine bath), CNC controller using CAD/CAM software, high pressure system, cutting head and abrasive particules controling system. Water nozzle diameter, [mm]: Mixing tube diameter, [mm]: Water flow rate, [l/min]: Abrasive flow rate, [g/s]: The geometry of the material sample subjected to AWJ machining it is presented in fig.. The material used inside of the experiment is P275NL2, that means a soft alloyed steel used for high pressure equipment, containing 0.17%C and the yield strength is about 275MPa
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