Woodworking – Process – Mechanical cutting or shaping
Patent
1984-09-20
1986-11-11
Bray, W. D.
Woodworking
Process
Mechanical cutting or shaping
83 16, 83171, 144209R, 361233, B27L 500
Patent
active
046216693
ABSTRACT:
A procedure the life of wood-cutting tools and relates to the cutting of green wood and comparable organic materials. The dulling of tools in such cutting is mainly corrosion of the cutting edge of the tool, which could be almost completely prevented under laboratory conditions by applying a high-voltage direct current. The dulling is also limited in practice in the procedure, which is based on the realization of the specific resistance of wood which is sufficient to render unnecessary the electric insulation of the tool or the wood being cut from the frame of the cutting machine. Such an operation is difficult to carry out, but was formerly believed to be indispensable. The invention, the negative terminal of a DC source is connected with the grounded frame of the machine. The current is conducted from the positive terminal of the DC source, using a suitable anode brush, into green wood acting like an electrolyte at a point close to the tool that is to be protected. The wood-cutting tool, and on its side also the means for feeding and supporting the wood, will then act as cathodes in the system and they will be protected against wear caused by corrosion.
REFERENCES:
patent: 855389 (1907-05-01), Dawkins
patent: 4453437 (1984-06-01), Ask
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Kivimaa, E., "What is the Dulling of Woodworking Tools?" (English translation), Technical Research Centre of Finland, Helsinki, Bulletin 106, p. 19.
Kivimaa, E., "Was ist die Abstumpfung der Holzbearbeitungswerkzeuge?", Holz als Roh-und Werkstoff, 1952, 10:425-428.
McKenzie, W. M., and McCombe, B. M., "Corrosive Wear of Veneer Knives", Forest Products Journal, 1968, 18 (3): 45, 46.
Lutz, J. F., "Knife wear. Techniques for Peeling, Slicing and Drying Veneer", Forest Products Laboratory, USDA, Madison, Wisconsin, 1974, Paper No. 228:26.
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