The research for the hardware production technology in KOFUN age with Scientific Methods and the reconstruction of the tool

我调查了一种制造它们的技术和工具，它是从生产时遗留下来的一种金属产品(剑和盔甲、马具、配件)中产生的。我应用了X射线、CT扫描和三维测量、材料成分分析、显微镜等自然科学方法。因此，通过对耳环生产流程的改造，我能够阐明一种使用过的工具和方法。此外，我还能从切割铁板(如盔甲)所用的痕迹中估计出凿边的大小。

I investigated a technique and the tool which produced them from a trace at the time of production left to a metal product(swords and armors, harness, accessories) of KOFUN age. I applied X-rays CT scanning and a three-dimensional measurement, the method of the natural science such as the ingredient analysis of materials, microscopy. As a result, through the reconstruction of the production process of the earring, I was able to elucidate a used tool and method. In addition, I was able to estimate the size of the chisel edge used from the trace that cut a board left for the iron such as armors.