Mechanochemical Fracture of the Components of Wood-Cutting Equipment

Woodworking Tools: Tribological Problems and Directions of Solutions

“…In the beginning of the process, when the temperature is 100-150 °C , moisture evaporates from the wood. Then when the temperature reaches 275-300 o C, hemicellulose starts decomposing, and at 400 o C the cellular tissue starts decomposing generating acids, alcohol and pitches [13]. The wear of tools may be divided into two main groups -mechanical and chemical wears.…”

“…Figure 6. Contact of wear products of wood and cutter with blades; 1 -unchanged tool material; 2 -wood; 3 -oxide layer; 4 -external abrasive particles; 5 -abrasive particles separated from the cutter; 6 -natural abrasive particles present in the wood; 7 -juvenile surface of tool material; 8 -areas affected by corrosion; 9 -hydrogen accumulation area; 10 -corroding medium [13]. Figure 7.…”

“…The hardness of cutting tools' substances, tension status, geometrical and structural integrity and surface roughness have big influence on saturation with hydrogen ( Fig. 8) [13].…”

“…Hydrogen wear. Where: -hydrogen molecule; 2 -decomposition of hydrogen molecule; 3 -hydrogen proton; 4 -hydrogen electron; 5 -crack on the cutter's surface; 6 -formation of hydrogen molecules; 7 -water; 8 -organic substance [13].…”

Wear of cemented tungsten carbide (WC) router cutters during oak wood milling

“…More intensive wear of tools' cutting edge appear when tools are used to process wet wood or wood based materials [3,4]. During cutting thermal, electric, and chemical factors affects the wear of WC tools' blades [5][6][7][8][9][10][11]. The wear of cutting edge (change in the micro-geometry of the cutting edge) is the main factor that restricts the efficiency of tools [4,6,12].…”