SAW TEETH'S MICROGEOMETRY TRANSFORMATION DURING LAMINATED PARTICLE BOARD CUTTING
Journal Title: Наукові доповіді НУБіП України - Year 2019, Vol 3, Issue 3
Abstract
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.
Authors and Affiliations
Z. S. Sirko, V. K. Dyakonov, D. P. Torchilevsky
Keywords
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- EP ID EP641392
- DOI 10.31548/dopovidi2019.03.017
- Views 114
- Downloads 0
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