Wear Analysis to Circular Saw Blades with Cutting of Carbide Metal Stuck at Beech Processing SPIRCHEZ COSMIN 1 , VALENTIN DITU 2 , NICOLAE TARAN 1 , LOREDANA ANNE-MARIE BADESCU 1 Department of Machines for Wood Industry1, Manufacturing Engineering2 Transilvania University of Braşov B-dul Eroilor, 29, 500036 Braşov ROMANIA [email protected]; [email protected]; [email protected]; [email protected]Abstract: - The paper presents an analysis of the wearness of circular saw blades with cutting of carbide metal stuck at beech processing to establish lastingness and to identify the moment for resharpening. Key-Words: - cutting wood, wear, circular saw blade, lastingness, beech, machining conditions) 1 Introduction Cutting wood with circular saw blades is accomplished on circular cross-cut saw. The tool is a round circular blade, which is in the area peripheral toothed, it execute a movement of rotation continues. Wood made a motion to continuously advance to the cloth cutting. Through this cutting process may accomplish in along sample, crosscut and cutting in a angle. Mechanical wood processing is an important act in technological assembly for obtaining wooden products. Wood cutting with circular saw blades represents on cutting process used in range of 70-80%, because of the ripping, cutting, trimming, operations. Dimensions of circular saws are in accordance with the characteristics and the construction of the machines and by the characteristics of wooden species. 2 Theoretical elements One of the basic conditions in exploitation circular saw blades is keeping capacity of cutting edges for a long time. Geometry of cutting edge is changing continuously between two sharpening, due to interaction between the wood and cutting edges. The wearness cutting edges produced minimum of the circular saw capacity. The wearness cutting edges, a result of interaction between wood and tooth, is may occur in the form of fracture or as normal. Wearness in the form of fracture, named wearness accidental, occurs when the cutting forces development in tooth tensions that stresses exceed the fracture strength of the tooth material. Wearness normal is occurs as a result of continuous wear of the tooth material. In the paper analysed mechanical wear. Mechanical wear occurs by removal of metal particles from outer layers of the tooth under the action of the friction forces between them and the wood The degree of wear and the wearness character circular saw blade, depends on the following parameters: physical and the mechanical properties of the tool material, conditions of cutting, machining conditions, quality of cutting edges, Are presented: wearness through abrasion, wearness through adhesion, wearness through diffusion, wearness through fatigue, electrical wearness, wearness through oxidation. The circular saw blade wearness only on outer clearance face and inner clearance face, or, and on front face. The factors that influenced wearness the circular saw blades are: machining conditions, geometry of circular saw blades, wood species, state technical equipment. The influenced machining conditions are made: cutting speed, feed speed, cutting depth. Increasing the feed speed occurs at intensification the wearness because increases strengths and temperature. Are presented the following relations for calculation wearness[3]. 1.VB = Q E/ 60 v t £ (mm), Where: Q- quantity of heat E- mechanical equivalent v- cutting speed t - cutting depth £ - stress 2. VB = [(A ſ e –ks/ R(ſ + 273)]1/2 * (1-tgǡ * tg Ǵ/t * tgǡ ) ½ (mm) Where: ſ – temperature of cutting Proceedings of the 8th WSEAS International Conference on SYSTEM SCIENCE and SIMULATION in ENGINEERING ISSN: 1790-2769 27 ISBN: 978-960-474-131-1
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Wear Analysis to Circular Saw Blades with Cutting of Carbide Metal Stuck at Beech Processing
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Wear Analysis to Circular Saw Blades with Cutting of Carbide Metal
Stuck at Beech Processing
SPIRCHEZ COSMIN1, VALENTIN DITU
2, NICOLAE TARAN
1, LOREDANA ANNE-MARIE
BADESCU1
Department of Machines for Wood Industry1, Manufacturing Engineering2