Influence of the parameters of deforming cutting on the features of the resulting slotted filter structures

OBRABOTKAMETALLOV Vol. 23 No. 4 2021 TECHNOLOGY and at the feed of 0.05 mm/rev, there is no region of group “ 1 ” either. This indicates that lower feed rates contribute to the formation of a common burr for the entire row of slots – the “skirt”. This circumstance may turn out to be extremely favorable for obtaining structures of high fi ltration fi ne- ness since lower values of the feed rate correspond to smaller values of the width of the slotted gap (see formula (1)). In addition, as noted above, the slots under the “skirt” are distinguished by high cleanliness and the absence of individual burrs; a simpler task than removing individual burrs. In the future, it is planned to check these assumptions by simulating the process of cutting slots and ad- ditional experiments with various corrugation pro fi les, as well as to investigate the possibility of removing “skirt”, in particular, by means of bypassing a powerful fl ow of fi ltering medium or tumbling. The smallest feed rate at which uniform slots (with the formation of a skirt) were obtained is 0.05 mm/ rev. This feed, according to formula (1), corresponds to a slot width of 19 μ m. Conclusion In the feed rate interval 0.2...0.4 mm/rev, with an increase in the depth of cut, there is a transition from uniform slotted structures (area “ A ”) to the area of the undesirable grouping of slot walls with an increase in every second or every third slot (area “ B ”), and the higher the feed rate, the greater the maximum depth of cut at which uniform slots are maintained. In each of these groups, the formation of burrs on the inner side of the slots was noted. Burrs in the slotted gap potentially degrade the performance of the fi lters and create the risk of plugging the fi ltrate when the burrs are stripped off. At lower feeds (up to 0.2 mm/rev inclusive) with a further increase in the depth of cut, the second region of structures potentially suitable for fi ltering tasks is reached – the region “ C ”, corresponding to the formation of a continuous burr (“skirt”) be- ing formed along the slot row on the internal side of the corrugation, upon which the slot structure becomes uniform again. When a “skirt” is formed there are no individual burrs for each slot, the shape of the slots is cleaner. With a feed decrease, the width of the resulting slots decreases. In this study, the smallest feed at which uniform slots are obtained, was 0.05 mm/rev, which corresponds to a slot width of 19 μ m. In the future, it is planned to carry out similar experiments with various materials while changing the geometric parameters of the DC tool. Establishing the reasons for the formation of “skirts”, the choice of the method for their removal, as well as the observed effect of the grouping of slot walls require additional research. References 1. Tarleton E.S. Progress in fi ltration and separation . Elsevier Science and Technology, 2018. 698 p. ISBN 9780081013939. ISBN 0081013930. 2. Matanovi ć D., Č ikeš M., Moslavac B. Sand control in well construction and operation . Berlin, Heidelberg, Springer, 2012. 200 p. ISBN 9783642256134. DOI: 10.1007/978-3-642-25614-1. 3. Deng F., Li X., He L., Feng Y. Experimental evaluation of metal foam for sand control. Journal of Petroleum Science and Engineering , 2019, vol. 176, pp. 1152–1160. DOI: 10.1016/j.petrol.2019.01.087. 4. Purchas D., Sutherland K. Handbook of fi lter media. 2nd ed. Oxford, Elsevier Advanced Technology, 2002. 572 p. ISBN 9781856173759. 5. Kumar J., Galyadav M., Srivastava S. Performance and backwashing ef fi ciency of screen, disc and sand fi lters in micro-irrigation systems. Trends in Biosciences , 2017, vol. 10 (12), p р . 2172–2178. Available at: http://trendsin- biosciencesjournal.com/upload/13-7477_( Jagdish_Kumar).pdf (accessed 20.10.2021). 6. Sparks T., Chase G. Filters and fi ltration handbook. 6th ed. Boston, MA, Elsevier, 2015. 444 p. ISBN 978-0- 08-099396-6. DOI: 10.1016/C2012-0-03230-9. 7. Tarleton S., Wakeman R. Solid/liquid separation: scale-up of industrial equipment . Elsevier Science, 2011. 743 p. ISBN 9780080551289. 8. Perlmutter B. Solid-liquid fi ltration: practical guides in chemical engineering . Elsevier Science, 2015. 211 p. ISBN 9780128030547. 9. Svarovsky L., ed. Solid- Liquid Separation . 4th ed. Chemical Engineering Series . Oxford, Boston, Butterworth- Heinemann, 2000. 554 p. ISBN 9780750645683. 10. Smith D., Graciano C., Martínez G. Expanded metal: A review of manufacturing, applications and structural performance. Thin-Walled Structures , 2021, vol. 160, p. 107371. DOI: 10.1016/j.tws.2020.107371.