Saw teeth's microgeometry transformation during laminated particle board cutting
DOI:
https://doi.org/10.31548/dopovidi2019.03.017Keywords:
saw tooth wear, front face, rear edge wear, radius of curvature, linear wear, saw tooth tipAbstract
The article presents the results of studies of the influence of the cutting path length on the change in the microgeometry of the circular saw tooth. The factor — the length of the cutter path in the material — varied from 120 m to 4 km. The material to be processed is a laminated particle board of the brand П-А 19 mm thick. The experiments were carried out on the saw experimental installation. The installation has the ability to adjust the speed of rotation of the saw and the feed rate of the material. A disk with wedge-shaped slots was used as a cutting tool. The test tooth was made of a hard alloy VK6M grade in the slot. The front angle of the tooth was 11 °, the posterior angle was 15 °, and the taper angle was 64 °. After working on a given distance, it was removed from the body of the saw, examined and photographed on a large instrumentation microscope MBI-2. Estimated wear of the tooth surface by measuring the distance from the top of the tooth to the tangent to the contour of the saw tooth, carried out at specified angles. A set of consecutive tangent lines to the smooth convex contour of a worn surface, (or lines, if, consider the section) allows replacing the continuous profile line with straight line segments.
Measurements were carried out in a tooth cross-section perpendicular to the short cutting edge. Identified specific values of wear of the saw tooth, depending on the length of the cutting path. It is shown that with an increase in the length of the cutting path, the wear on the rear face significantly exceeds this parameter from the front face. The distribution of wear in the directions from the front to the rear shows that they are very well approximated by a second-order curve (this is indicated by a correlation coefficient close to unity). From this it follows that the nature of wear with an increase in the cutting path does not change.
The point separating the front and rear faces is defined. Identified the drift of this point, depending on the growth of wear. Localization of the top of the parabola with an increase in the cutting path is shifted towards the front face. The displacement is insignificant, however, it shows the tendency of the apex to drift towards the front face. Physically, the top of a parabola characterizes the location of the blade on the surface of a blunt tooth.
References
Kіrik M.D. (2006) Mekhanіchne obroblennya derevini ta derevnih materіalіv: monografiya. [Mechanical processing of wood and wood materials]. Kol'orove nebo,. 412.
Kіrik M.D. (1999) Іnstrument dlya obroblyannya derevini ta derevnih materіalіv. [Tools for processing wood and wood materials]. VMC Kolomijs'kogo mekhanіko-tekhnologіchnogo koledzhu, 190.
Amalickij Vit.V. (2005). Pilenie tverdosplavnymi kruglymi pilami i ih zatochka. [Cutting by carbide circular saws and their sharpening]. Derevoobrabatyvayushchaya promyshlennost. 5, 6–10.
Amalickij Vik.V., Amalickij Vit.V., Abrazumov V.V. (2005). Vybor materiala rezhushchego instrumenta dlya obrabotki cementno-struzhechnyh plit [Cutting tool material selection for processing of cement particle boards] Derevoobrabatyvayushchaya promyshlennost'. 7, 2–5.
Pamfilov E.A.,. SHeveleva E.V. (2017). Osobennosti issledovaniya iznashivaniya rezhushchih instrumentov dlya pererabotki drevesnyh materialov. [Research features of cutting tool wear for processing of wood materials]. Lesnoj zhurnal. 6, 89–103. https://doi.org/10.17238/issn0536-1036.2017.6.89
Diakonov V.K., Sirko Z.S., (2012). Sposіb ocіnki parametrіv profіlyu rіzhuchogo elementa Patent of Ukraine for useful model. S01 V 21/04. №71771, № u 2012 00534; declared 17.01.2012; published 25.07.12. № 14.
Zotov H.A., Pamfylov E.A. (1991). Pidvyshchennia stiikosti derevorizhuchoho instrumentu: monohrafiia. [Increasing the durability of wood-cutting tools] Ekolohiia, 304
Diakonov V.K., Sirko Z.S., Brauzevetter Yurhen. (2018). Prystrii dlia vymiriuvannia liniinykh rozmiriv zubiv pylky. [Device for measuring the size of the saw teeth] Conference of the Tsili staloho rozvytku tretoho tysiacholittia. Kyiv, Universytet bioresursiv i pryrodokorystuvannia Ukrainy, 238-239
Downloads
Published
Issue
Section
License
Relationship between right holders and users shall be governed by the terms of the license Creative Commons Attribution – non-commercial – Distribution On Same Conditions 4.0 international (CC BY-NC-SA 4.0):https://creativecommons.org/licenses/by-nc-sa/4.0/deed.uk
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
