MANUFACTURE OF KEY STONE TYPE SUPERCONDUCTOR STRANDED WIRE

PURPOSE: To easily carry out control for keeping size tolerance by control a heater by electricity application as to continuously keep the temperature of the heater which heats four-way rolling rolls of compress and form a superconductor wire in a key stone shape with in a prescribed set range. CONSTITUTION: While being stranded by a mandrel 5 after passing an assembling plate 4, superconductive electric wires 3 from a wire stranding apparatus are formed by four-way rolling rolls which are preheated to a temperature range as same as the friction heat at the time of compressing and forming and the wires are made to be a key stone-type superconductor stranded wire. That process is carried out under constant room temperature in an air conditioned room and the rolls 6 are continuously kept and hold at preheated temperature by controlling the electricity application to a heater 12 while the temperature being measured by a thermostat as to keep the heater temperature within a set range from 50 deg.C to 60 deg.C and consequently the outer diameter of the rolls 6 scarcely alters and the control to keep the size tolerance can be done easily and a key stone-type superconductor stranded wire in which size tolerance is retained can be manufactured.