| Popis: |
The article covers the issues related to wear and blunting of the teeth of wood-cutting tools, which leads to the loss of the tool's cutting capacity, a decrease in the productivity of the wood sawing process, the quality of lumber and blanks, and an increase in energy costs. It is shown that the process of wear of a wood-cutting tool is a rather complex complex of interrelated phenomena. The types of wear of the tool are given and it is indicated that the degree of wear of the cutting part of the saw teeth and the nature of the change in their microgeometry depends on a number of factors. Methods of increasing the wear resistance of wood-cutting saws are considered. It is shown that the method of strengthening saw teeth by surfacing wear-resistant alloys is the most promising. The purpose of the research is to increase the wear resistance and efficiency of the use of saws due to their strengthening by the method of plasma application of wear-resistant alloys. The method of experimental research with a circular saw of a special design is presented, the geometric parameters of the experimental samples of the tool are determined. Saws with inserted teeth made of P6M5, 8X6НФT, 9ХФ steels, cast hard alloy ВЗКР and hard metal-ceramic alloy ВK15 were studied. The analysis of the obtained results showed that the dulling intensity is the lowest with the use of the ВЗКР alloy. Wear-resistant ВЗКР alloy can be welded using various methods on automated equipment, provides high wear resistance of the tool and is cheaper than metal-ceramic hard alloys. The characteristics of the equipment for surfacing wear-resistant alloys on saw teeth and the technology of their strengthening are given. Tests of saws with teeth strengthened by ВЗКР alloy deposited in production conditions showed high wear resistance of saws, increased productivity of the sawing process, reduction of roughness of processing surfaces, and reduction of saw dust consumption in the sawing process. |
