| 摘要 |
PURPOSE:To strongly join a large sized cylindrical member simply and inexpensively by providing the jig having a specific thermal expansion coefficiency at the outside of a multiple cylindrical member and utilizing the thermal stress due to the initial gap and thermal expansion difference of each member. CONSTITUTION:The outer cylinder 1 and inner cylinder 2 of the material to be joined are engaged and at the outside thereof the cylindrical jig 3 of the material having the thermal expansion coefficient smaller than either of the inner and outer cylinders 1, 2 is arranged by closely fitting to the outer cylinder 1. The inner and outer cylinder 1, 2 and jig 3 are heated by using a heater 5 under the conditions that the total amount of the initial gap between the jig 3 and outer cylinder 1 and that between the outer cylinder 1 and inner cylinder 2 becomes smaller than the difference in the thermal expansion amount of the inner cylinder 2 and that of the jig 3 which contract by heating. Consequently the gap contracting by the heating becomes larger than the initial gap, a thermal stress is caused on the joining face and the cylindrical member can be joined strongly and simply with the pressing force.
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