An Experiment on Characteristics of Band Saw Vibration : Vibration Mode and Amplitude

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  • 帯鋸の振動特性に関する一考察 : 振動モードと振幅
  • オビノコ ノ シンドウ トクセイ ニ カンスル イチコウサツ シンドウ モード

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Abstract

In order to clarify the vibration characteristics of band saw, transient response of band saws of different tensioning and back stretching radii (Fig. 2) was measured in both front and rear edges of a saw blade when the saw was excited impulsively at the halfway between wheel axes (Fig. 3). Vibration mode, natural frequencies, amplitude were analyzed and the influences of tensioning or back stretching and tensile stress distribution across saw width on the vibration characteristics were discussed. The transient vibration mainly cosisted of both flexural and torsional damped vibration of modal number one (Fig. 4) and corresponded to the impulse response of the modes analyzed theoretically (Fig. 1). Flexural amplitude was larger than torsional one (Fig. 5) and increased according to the decrease of the tensile stress due to the inclination of upper wheel, as well as to the decrease of tensile force (Fig. 6). This change was not influenced by saw tensioning nor back stretching. Torsional amplitude was not influenced by the stress distribution. Vibration of saws in idling mainly consisted of both flexural and torsional vibration of the lower modal numbers and amplitude was changed in saw width according to the vibration characteristics observed in shock excitation (Fig. 7).

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