Avoidance of Thermal Buckling by Forming Concentric Circular Grooves on, Circular Saw-blade Surfaces

在锯切木材的过程中，锯材有时会与圆锯片表面的阻力接触，锯片上的温度会因摩擦而升高。锯片的径向温度分布导致锯片热屈曲，不能继续锯切。在本研究中，新设计的锯片表面是为了不提高锯片的温度而设计的，即使锯片上的木材接触阻力也是如此。同心圆槽的截面为三角形。锯切过程中，锯切过程中，锯切过程中锯片表面不再与旋转圆锯机接触，而是在锯片表面形成横截面为三角形的同心圆形沟槽，锯片表面的摩擦升温速度变得平缓，主要是由于锯条表面有同心圆槽的缘故，而不是靠旋转圆锯机的阻力压在锯片表面，从而有效抑制了摩擦热。然而，随着凹槽深度的增加，固有频率变低，从刚性的角度来看，凹槽的深度不是很理想。

During rip-sawing of a lumber, the sawn lumber sometimes contacts resistant on the surface of circular saw-blade and the temperature on the saw-blade increases by the friction. The radial temperature distribution induces thermal buckling of saw-blade, then sawing can not be continued. In this study, the new designed surface of the saw-blade is made for the purpose that the emperature of saw-blade is not increase, even if lumber contacts resistant on the saw-blade. The section of concentric circular groove is triangular form. The temperature rise speed by the friction became gentle due to concentric circular grooves when the lumber was resistant pressed against the surface of rotating circular saw resistant instead of the contact of the rotating circular saw and the lumber in sawing.It was effective to suppress the friction heat by forming the concentric circular grooves that the cross section was triangular on circular saw-blade surfaces.As the increase of groove depth, the contact area (land width B) became smaller, and the temperature rise decreased, and it was effective in view of the friction heat control. However, the natural frequency became lower as the increase of groove depth, and it was not desirable that groove was very much deepened in view of the rigidity.