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

OBRABOTKAMETALLOV Vol. 23 No. 4 2021 TECHNOLOGY In fl uence of the parameters of deforming cutting on the features of the resulting slotted fi lter structures Bauman Moscow State Technical University, 5 2 nd Baumanskaya str., Moscow, 105005, Russian Federation a https://orcid.org/0000-0002-7258-7379, dm.buzaev@bmstu.ru , b https://orcid.org/0000-0003-3757-1299, zoubkovn@bmstu.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2021 vol. 23 no. 4 pp. 33–46 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2021-23.4-33-46 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 09 August 2021 Revised: 31 August 2021 Accepted: 16 October 2021 Available online: 15 December 2021 Keywords : Filters Filtration Solid-liquid separation Filtering tubes Slot fi lters Regenerating fi lters Deforming cutting ABSTRACT Introduction. Slot fi lters are in demand in petrochemical, machine-building, food, mining and other industries. DC is an edge cutting machining method based on undercutting and plastic deformation of the workpiece’s surface layer without its removal in the form of chip. DC stands out from the other slot structure forming methods for its capability of obtaining fi ne fi lters (slot width upwards of 20 μ m) while maintaining relatively high productivity rate and being waste-free. Nevertheless, patterns of through slots cutting by means of DC had virtually not been investigated previously. The purpose of the work is to establish the in fl uence of the main parameters of deformational cutting, namely feed and depth of cut, on features of through slots obtained, as well as identifying combinations of parameters that ensure the production of structures suitable for fi ltration. Method of investigation consisted of experiments on through-cutting of corrugations stamped on copper strips and a visual analysis of the structures obtained. Cutting through the corrugations by DC was conducted on a lathe while using a special attachment – a barrel which workpiece corrugated strips were wrapped around and fi xed on with tension. Results and discussion . The resulting typical structures obtained under different combinations of depth of cut and feed are systemized and divided into the following groups: “0” – the absence of the through cut; “1” – uniform slots; “2” – “twinning” (pairwise convergence of slot walls), “3” – stripping of every second slot wall; “4” – non-regular or complete stripping of slot walls; “5” – uniform slots with a continuous burr (“skirt”) formed along the slot row on the internal side of the corrugation; “6” – uniform slots with a “skirt” opened incompletely. In the range of feeds 0.2 ... 0.4 mm/rev with increasing cutting depth, there is a transition from structures of group “1” to structures of group “2”, and the greater the feed, the greater the maximum depth of cut, at which uniform slots remain. Group “1” is assigned to the area of structures suitable for fi ltration applications, although it is characterized by the formation of individual burrs on the inner side of each slot. At lower feeds (up to 0.2 mm/rev) with further increase of the depth of cut another group of structures potentially suitable for fi ltering purposes is reached: groups “5” and “6”. With the “skirt” formed, individual burrs next to each slots are absent, and the shape of slots is cleaner. With a decrease in feed, the width of the resulting slots decreases. The least tool feed value, at which uniform slots are obtained, is 0.05 mm/rev which corresponds to 19 μ m slot width. Establishing the causes of “twinning” and the formation of “skirts” requires further investigation. For citation: Buzaev D.A., Zubkov N.N. In fl uence of the parameters of deforming cutting on the features of the resulting slotted fi lter structures. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2021, vol. 23, no. 4, pp. 33–46. DOI: 10.17212/1994-6309-2021-23.4-33-46. (In Russian). ______ * Corresponding author Buzaev Dmitry A. , Assistant Bauman Moscow State Technical University, 5 2nd Baumanskaya Str., 105005, Moscow, Russian Federation Tel.: +7 (903) 679-96-59, e-mail: dm.buzaev@bmstu.ru Introduction The need for fi ltration of liquids and gases arises in many industries, such as petrochemical, mechanical engineering, food, mining and processing and others, as well as in the organization of various water supply systems [1]. The most widespread among metal fi lter elements are mesh [2], as well as those obtained by the method of powder metallurgy and made from metal foam with a pore diameter of 50 μ m [3], etc. Dmitry Buzaev a,* , Nikolay Zubkov b