Methods for normalization of the stress state of circular saws

I.T. Rebeznyuk; S. Salovskyy

doi:10.36930/42204608

Authors

I.T. Rebeznyuk
S. Salovskyy

DOI:

https://doi.org/10.36930/42204608

Keywords:

circular saw; stress state; ways of normalization; compensating slots

Abstract

Abstract. One of the most important tasks of modern woodworking is to increase the efficiency of circular saws by improving the performance of woodcutting tools. The practice of operating circular saws shows that up to 40% of breakdown losses of saws and up to 50 % of defective products are due to insufficient tool performance. Numerous studies have shown that the main cause of the loss of efficiency of circular saws are thermal stresses due to uneven heating of the saw blade. In modern scientific and industrial practice, a number of methods have been developed and used to compensate for thermal stresses: the classic slip-rolling of a saw blade, its heating or cooling, and so on. Among them is the method of creating compensating slots, as the most effective one and which does not require significant material costs. The shapes and location of compensating slots on the saw blades of the leading companies that manufacture wood cutting tools are analyzed and a new shape of the slots in the form of an Archimedes spiral and their location on the saw blade is proposed. Analysis of ways to normalize the stress state of circular saw blades showed that the simplest and most promising method of normalization is a method of creating slots in the saw blade, which does not require additional costs and is formed by laser during the manufacture of saw blades. The presence of slots in the saw blade reduces the temperature effects, thereby increasing the stability of the flat balance of the saws during sawing. However, the design of the slots is chosen intuitively, and the validity of one or another form of slots is usually proved by experimental methods.

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