| 摘要 |
PURPOSE: A shank is provided to improve a vibration proof characteristic by inserting an alloy plate having a low yield strength among the existing shank materials. CONSTITUTION: A shank having an excellent vibration proof characteristic is produced by spot welding after inserting an alloy plate of one element selected among Al, Pb, Cu, and Ni, having a lower yield strength than a steel plate of the shank between more than two shank steel plates. Herein, the vibration energy is consumed as heat since the plastic deformation of Ai tension and compression are repeated at a high speed. Thereby, the effect of reducing noise over 25dB is accomplished with a simple process of inserting the alloy plate having the low yield strength in the shank. |
