Effect of steel structure on the declination angle in AWJ cutting

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

doi:10.1016/j.ijmachtools.2012.07.015

Cited by 31 publications

(32 citation statements)

References 23 publications

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“…The first finding was obvious and undisputable: the range of changes in Ra (in the same line position) varied from 41% to 54% for the same material; it is clear that such changes cannot correspond to Young’s modulus values, which are never influenced by heat treatment to such an extent This finding corresponds to a discrepancy between the modulus values and respective mean declination angles referred to in [ 26 ]. It can, therefore, reasonably be stated that the modulus is not significantly responsible for the surface roughness.…”

Section: Discussionmentioning

confidence: 97%

“…One of the most interesting and inspiring works is the research of Strnadel et al [ 26 ], who studied the relationships between the declination angle introduced by Hlaváč [ 27 ] and selected material properties, namely the strength, hardness and material element size. Although their research was aimed at another problem, they announced that their results indicated the dependence of the AWJ declination angle not only on strength characteristics, but also on the microstructure of the steel—i.e., on the way in which plastic deformation occurred during the AWJ–material interaction.…”

Section: Introductionmentioning

confidence: 99%

“…Our research was aimed at testing the validity of the findings presented in [ 26 ] for other surface quality indicators than the declination angle, namely Ra and Rz , which are more generally applied in engineering. We also included the mean width of the assessed profile RSm into our surface roughness evaluation, as we supposed it to be potentially related to the internal structure of the material.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Steel Structure on Machinability by Abrasive Water Jet

et al. 2020

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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 ]). The respective equations are based on jet and material characteristic parameters:

…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The theoretical model presented in [ 23 , 24 , 25 , 26 ] makes it possible to limit the transfer values determined for one machining configuration to another, reducing the necessary experimental work. Equation (4) is based on functional dependences of traverse speed on respective changing variables-Equations (1) and (2).…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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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