Improvement of wear proof of woodcutting tool by using shot peening

用直径为45微米的硬质玻璃微珠在不同的条件下对木材的周边铣刀进行了喷丸处理。被盗工具是SKH51。在2kgf/cm~2气压下，硬度达到最大值HV1150；在3 kg/cm~2气压下，硬度达到最大值HV1200。近表面喷丸的工具钢硬度最高，距表面6微米处的硬度为HV950。当喷丸压力为3 kg/cm~2，喷丸时间为16s时，喷丸效果最佳。在刀具表面和刀具背面进行喷丸后，无论喷丸条件如何，磨损衰退均为5微米。经喷丸处理后的刀具磨损率与未经喷丸处理的刀具的磨损率相同。喷丸处理不能提高木工刀具的耐磨性。而在空气压力为1.5 kg/cm~2、喷丸时间为1s的条件下，刀具的磨损量为2.5um，喷丸后刀具的磨损率降低。采用喷丸强化可以提高木工刀具的耐磨性。为了在不久的将来改进木工刀具，我们必须找到最合适的喷丸条件。

The peripheral milling cutter for wood was peened with the hard glass beads (45 mum diameter) under the various conditions. The tool steal was SKH51. The hardness increased to maximum HV1150 under 2kgf/cm^2 air pressure and increased to maximum HV1200 under 3kg/cm^2 air pressure. The hardness of tool steel peened in near surface was the hardest and one in the part where is depth of 6 mum from the surface was HV950. The condition where an air pressure was 3kg/cm^2 and a peening time was 16 seconds was the most suitable. The wear recession was 5 mum after the peening on tool face and tool back regardless of the peening condition. The wear rate of tool peened for cutting length was as same as one of tool without peening. We could not improve the wear proof of woodcutting tool by using shot peening. However the wear recession was 2.5 mum under the condition where an air pressure was 1.5kg/cm^2 and a peening time was 1 second and then the wear rate of tool peened decreased. We could improve the wear proof of wood cutting tool by using shot peening. We have to find the most suitable peening condition for improvement of woodcutting tool near future.