The model of product distortion in AWJ cutting

Hlaváč, Libor M.; Strnadel, Bohumír; Kaličinský, Jiří; Gembalová, Lucie

doi:10.1007/s00170-011-3788-2

Cited by 38 publications

(38 citation statements)

References 17 publications

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“…One of the theoretical models presented by Hlaváč [ 34 ] is based on the cutting quality determination through the ratio of traverse speed to the limit one. Nowadays, the declination angle of striations measured at the bottom edge of a sample wall is used for cutting quality evaluation, as was presented in [ 35 , 36 ]. The specific factors introduced in these previous articles are namely the limit traverse speed and the limit declination angle.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Abrasive Waterjet (AWJ) Forces—Indicator of Cutting System Malfunction

et al. 2021

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Measurements enabling the online monitoring of the abrasive waterjet (AWJ) cutting process are still under development. This paper presents an experimental method which can be applicable for the evaluation of the AWJ cutting quality through the measurement of forces during the cutting process. The force measuring device developed and patented by our team has been used for measurement on several metal materials. The results show the dependence of the cutting to deformation force ratio on the relative traverse speed. Thus, the force data may help with a better understanding the interaction between the abrasive jet and the material, simultaneously impacting the improvement of both the theoretical and empirical models. The advanced models could substantially improve the selection of suitable parameters for AWJ cutting, milling or turning with the desired quality of product at the end of the process. Nevertheless, it is also presented that force measurements may detect some undesired effects, e.g., not fully penetrated material and/or some product distortions. In the case of a proper designing of the measuring device, the force measurement can be applied in the online monitoring of the cutting process and its continuous control.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Abrasive Waterjet (AWJ) Forces—Indicator of Cutting System Malfunction

et al. 2021

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“…The theoretical model, used for the calculations necessary to determine the relative traverse speeds (the independent variables in this research), is based on the limit traverse speed

determined for each material by Hlaváč et al [ 23 ] according to his equations. The respective jet velocity loss

is to be determined experimentally because of the interaction time uncertainty (explanation of this parameter and its determination was presented by Strnadel et al in [ 24 ]).…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The declination angle of striations measured at the bottom edge of a sample wall for a certain traverse speed introduced by Hlaváč [ 25 ] can be used for the calculation of the limit value according the equation

where the traverse speed

is the experimental one for which the declination angle

is measured on the kerf wall [ 25 ]. The declination angle or respective relative traverse speed (the ratio of

and

) can be utilized for determination of some quantities and process parameters regarding required quality of cutting, i.e., declination angle of striations on the kerf walls [ 23 ] and inclination of the walls (the taper) [ 26 ]. Because the traverse speed of the cutting head is the most easily controlled parameter of AWJ machining, it is very important to know the relationship between this speed and resulting quality, as it was presented by Hlaváč et al [ 27 ].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Influence of Material Structure on Forces Measured during Abrasive Waterjet (AWJ) Machining

et al. 2020

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Material structure is one of the important factors influencing abrasive waterjet (AWJ) machining efficiency and quality. The force measurements were performed on samples prepared from two very similar steels with different thicknesses and heat treatment. The samples were austenitized at 850 °C, quenched in polymer and tempered at various temperatures between 20 °C and 640 °C. The resulting states of material substantially differed in strength and hardness. Therefore, samples prepared from these material states are ideal for testing of material response to AWJ. The force measurements were chosen to test the possible influence of material structure on the material response to the AWJ impact. The results show that differences in material structure and respective material properties influence the limit traverse speed. The cutting to deformation force ratio seems to be a function of relative traverse speed independently on material structure.

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“…Whereas in models published in [ 11 , 12 , 13 , 14 ], the data used for the proposed models’ verification came from the cutting of nonmetal, rather brittle, materials, e.g., granite, perspex or ceramics, other authors focused their attention on metals, like Hashish did. Arola and Ramulu found that the depth of subsurface plastic deformation is inversely proportional to a metal’s strength coefficient [ 18 ], Chen et al improved the cutting quality of mild steel by controlled nozzle oscillations [ 19 ], Hascalik et al studied the depth of cut and smooth cutting region on titanium [ 20 ], Hlaváč et al proposed a method for the compensation of the jet retardation and the taper [ 21 ], and Monno et al studied the influence of heat treatment on the kerf roughness of carbon steel cut by AWJ [ 22 ]. Some of these researchers prepared models for the process description, while others focused on specific problems, among which the geometric accuracy, surface integrity and kerf roughness are achieving much attention [ 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Steel Structure on Machinability by Abrasive Water Jet

et al. 2020

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Although the abrasive waterjet (AWJ) has been widely used for steel cutting for decades and there are hundreds of research papers or even books dealing with this technology, relatively little is known about the relation between the steel microstructure and the AWJ cutting efficiency. The steel microstructure can be significantly affected by heat treatment. Three different steel grades, carbon steel C45, micro-alloyed steel 37MnSi5 and low-alloy steel 30CrV9, were subjected to four different types of heat treatment: normalization annealing, soft annealing, quenching and quenching followed by tempering. Then, they were cut by an abrasive water jet, while identical cutting parameters were applied. The relations between the mechanical characteristics of heat-treated steels and the surface roughness parameters Ra, Rz and RSm were studied. A comparison of changes in the surface roughness parameters and Young modulus variation led to the conclusion that the modulus was not significantly responsible for the surface roughness. The changes of RSm did not prove any correlation to either the mechanical characteristics or the visible microstructure dimensions. The homogeneity of the steel microstructure appeared to be the most important factor for the cutting quality; the higher the difference in the hardness of the structural components in the inhomogeneous microstructure was, the higher were the roughness values. A more complex measurement and critical evaluation of the declination angle measurement compared to the surface roughness measurement are planned in future research.

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The model of product distortion in AWJ cutting

Cited by 38 publications

References 17 publications

Abrasive Waterjet (AWJ) Forces—Indicator of Cutting System Malfunction

Abrasive Waterjet (AWJ) Forces—Indicator of Cutting System Malfunction

Influence of Material Structure on Forces Measured during Abrasive Waterjet (AWJ) Machining

Influence of Steel Structure on Machinability by Abrasive Water Jet

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