A NOVEL TECHNIQUE FOR TENSIONING CIRCULAR SAWS USING INDUCTION HARDENING

为了防止圆锯在锯切过程中的热屈曲，一个世纪以来，人们在圆锯的外部区域机械地引入了切向拉应力，在内部区域引入了切向压应力。这种处理称为张紧。我们提出了一种理论，通过热处理，外部和内部区域应受到拉伸和压缩应力，分别在锯的中心均匀加热的情况下，首先冷却。设计了一副用于锯片压回火的模具，并对锯片进行了感应淬火物理拉伸。用x射线沿着锯的半径测量切向残余应力，结果表明锯的外区为拉应力，内区为压缩应力。因此，实验成功地证明了热处理拉伸理论的有效性。

To prevent thermal buckling of a circular saw during sawing, tangential tensile-stresses have been mechanically introduced into the outer zone of a saw and tangential compressive-stresses into the inner zone over a century. This processing is called TENSIONING.We proposed a theory of tensioning by heat treatment that the outer and inner zones should be subjected to tensile and compressive stresses, respectively in the case where the center of a saw evenly heated is cooled first. A pair of dies were designed for press-tempering of a saw and the saw was physically tensioned using induction hardening. Tangential residual-stresses were measured along a radius of the saw by X-ray, and the results revealed that the outer zone of the saw was stressed in tension and the inner zone was stressed in compression. Thus, the experiments successfully proved the theory of tensioning by heat treatment is valid.