| 摘要 |
PURPOSE:To make decrease in cost and reduction in a manufacturing period in a highly accurate manner, by setting up a vent member in a vent hole setup groove installed in a forming position of a rib and a lag on a net ring blank joining surface, while machining the rib and the lag after reembedding. CONSTITUTION:A net ring blank 30' is provided with a curved surface corresponding to a tire tread, namely, a joining surface 30-1 coming into contact with a profile ring inner circumferential surface 4-1, while it has a machining stock for forming a rib 6, a lag 7 and a shoulder skeleton part 8, and vent hole setup grooves 32 are grooved on the joining surface 30-1 so as to interconnect intervals between respective regions partitioned off by the rib 6 and the lag 7 as well as to keep a proper separating distance between the inner circumferential surface of a pipe 33 and the joining surface 30-1. Next, after setting up the pipe 33 in each of these setup grooves 32, these grooves 32 are filled up and deposited till they provide for a machining stock sufficing for forming the joining surface 30-1, then the joining surface 30-1 is formed for a deposition member 34 whereby electric discharge machining for forming the rib 6, the lag 7, the shoulder skeleton part 8 and a connecting member 21 is carried out, thus a net ring 30 provided with an exhaust device is secured. |
