| 摘要 |
PURPOSE:To save manufacturing time and cost without pre-cutting segments to get the desired spaces by assembling plural numbers of segments, cut with the wire cutter with the spaces equal to the cutting margins of wire. CONSTITUTION:The segments 1-1 up to 1-7 are provided by cutting the tread ring A, a ring body made of aluminum alloy, on the inner circumference on which the desired tread 4 is formed into the plural pieces in the gnomonic direction. The said segments are assembled cyclicly leaving the space (d) be tween each piece of the segments to make up a split-type mold for molding tyres. The tread ring A is cut by means of wire discharging, making the cutting margin d' approximately 0.3mm. This cutting margin d' conforms with the space (d) between each piece of the segments, which provides the required space (d) by assembling plural numbers of segments 1-1 up to 1-7 directly and cyclicly. This process eliminates cutting the face of elements with the band saw and with the milling machine required in the existing process. |
