It is well known that the edge of laminated particleboard becomes more and more rough with increasing tool wear. In the industry, operators of sawing machines make their decisions to replace blunt circular saw blade with sharp one on the basis of their subjective feeling. They say that edge quality does not decrease linearly in the machining time. However they were not able to describe the mode of quality decrease. Presented research was undertaken in order to find the relationship between tool wear, measured as a length of cut per tooth, and quality of particleboard edge after sawing. Over 500 m2 of laminated particleboards coming from one production batch were sawn in industrial conditions to obtain required length of cut per tooth, which defined the progressing tool wear. Each tooth of the saw passed length of over 6 000 m in the material. Three parameters to characterized the edge quality, proposed in previous research, were calculated discretely: maximal width, relative area and relative weighted area of edge chippings. As a results graphs of quality parameters vs. cutting length as well as their derivatives were given and analyzed.
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