The Effect of Zonal Deformations on the Mechanical Properties of Circular Saws

Abstract

In this paper the effect of zonal saw deformation on its elastic plastic properties is presented. Experiments were carried out using a special vibrating stand. A hand-operated saw-tooth setting machine was used to form the saw path by selecting the following three values for bending teeth ζ: 0.4 mm (0.2 mm to one side), 0.6 mm (0.3 mm to one side) and 0.8 mm (0.4 mm to one side). For the research five circular crosscut saws with a diameter of 400 mm each were selected. During the tests saw tightening moment was 150 Nm and measurements were performed within the range of 20 Hz – 2000 Hz. The results include established coefficient of damping and dynamic Young`s modulus for all zones of the saws. It was determined that zonal deformation has a significant impact on the distribution of elastic-plastic properties within the saw plane. It was found that by bending saw teeth from 0 mm up to 0.4 mm in one of the saw plane zones, the average coefficient of damping increases by 5.57 times with the distance changing from flanges to the teeth zone, meanwhile the dynamic Young’s modulus decreases by approximately 25 % in each case. By forming the saw path and obtaining a higher value of the coefficient of damping, the circular saw can operate in a more stable manner.