| 摘要 |
PURPOSE:To finely finish a helmet neck part to a curved surface independently of the simple structure and the simple operation, permit the easy disposal even if the size of the helmet is changed or the curved surface shape of the neck part is changed, and prevent the grinding trash from being dropped into the helmet. CONSTITUTION:The upper surface 4a of a shaping mold 4 is formed to the curved surface conforming to the designed shaping curved surface of a helmet neck part 20a, and a grinding belt 2 is allowed to circulate by a belt circulating device 3 through the sliding movement along the upper surface of the shaping mold. A helmet is held by a helmet pressing mechanism, and the neck part is placed on the shaping mold and pressed on the grinding belt, and grinding is executed. |
