MANUFACTURING METHOD OF THREE-LAYER STRUCTURAL CYLINDRICAL BODY

摘要

PURPOSE:To raise the mechanical strength of a three-layer structural cylindrical body, by manufacturing it upon heat treatment in spraying copper and copper alloy to both large and small diametral outer and inner cylinders, an intermediate cylinder and both inner and outer cylinders of copper and copper alloy, in case of a manufacturing method of the three-layer structural cylindrical body of a rotor for a superconductivity motor. CONSTITUTION:A cylindrical body of an intermediate diameter composed of a copper system material is produced as an intermediate cylinder 5, while a larger cylindrical body than the intermediate cylinder 5 is set down to an outer cylinder 6 and a smaller cylindrical body than the intermediate cylinder 5 is set down to an inner cylinder 7 whereby each of them is manufactured with precipitation hardening system stainless steel. A copper system material 8 of the same quality of material as the intermeditate cylinder 5 is firmly stuck to an outer circumference of the cylinder 7 in uniform thickness by means of a metal-spraying process, At this time, this spraying also takes place on an inner circumference of the outer cylinder 6. A three-layer cylinder 10 is manufactured by means of shrinkage fit or expansion fit of those of inner cylinder 7, intermeditate cylinder 5 and outer cylinder 6. Setting them within the range of a temperature of 700-1,000 deg.C, the three-layer cylinder 10 is heated whereby metallugical binding in a boundary surface of these cylinder 7, 5 and 6 is accelerated in this way.