| 摘要 |
<p>The procedure for prolonging the life of wood-cutting tools relates to the cutting of green wood and comparable organic materials. The applicant has already earlier, more than 30 years ago, shown that 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 present invention enables the dulling to be limited also in practice. The invention is based on the realization of the specific resistance of wood which is sufficient to render unnecessary the electric insulation of the tool or of the wood that is being cut from the frame of the cutting machine, an operation which is difficult to carry out but was formerly believed to be indispensable. As taught by the invention, the negative terminal of a direct current source is connected with the grounded frame of the machine. The current is conducted from the positive terminal of the direct current source, using a suitable anode brush, into green wood acting like an electrolyte at a point close to the tool that has 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.</p> |
