Abstract
Rolling path squeezes and rolling residual stresses of large diameter circular saw body for wood, generated by rolling pressure from 10 up to 120 bar were examined. X-ray diffraction, Barkhausen noise (BN) and Full Width of the peak at a Half Maximum (FWHM) (o) methods for evaluation of residual stresses were used. Dependencies of a tangential rolling residual stresses inside rolling paths upon rolling pressure p (bar) and rolling area A (mm2) were evaluated. The rolling pressure, as large as 60 bar, resulting in the rolling squeeze as high as 0.04 mm2, and, tangential residual compression stresses inside a rolling path, as large as ?TI = ?822 MPa, was considered to be the largest for the practical application.
Highlights
Circular saws rolling use to be widely applied method of initial tensioning, aiming at increase the dynamic stiffness of saws for wood and secondary wood products machining
The rolling pressure, as large as 60 bar, resulting in the rolling squeeze as high as 0.04 mm2, and, tangential residual compression stresses inside a rolling path, as large as TI = −822 MPa, was considered to be the largest for the practical application
The width w of the rolling squeezes, shown in Figure 5 increased with a growth of the rolling pressure p until 50 bar
Summary
Circular saws rolling use to be widely applied method of initial tensioning, aiming at increase the dynamic stiffness of saws for wood and secondary wood products machining. This method is not devoid of negative aspects. It has to be mentioned that the rolling may cause necessity to correct flatness when stresses distribution inside a circular saw body is not correct. The goals of actual work were: to exam the amount of squeeze in a circular saw body using different rolling pressures p (bar) and measure presence of residual stresses using three different techniques
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