| 摘要 |
PURPOSE:To prevent the breakdown of a difficult workable wire of a TiNi shape memory alloy, etc. by the abrupt heating in a heating drawing machine in the stage of passing said wire through a die and drawing the same by passing the wire to an upsetting machine for hot working prior to the drawing. CONSTITUTION:The hardly workable wire consisting of the TiNi shape alloy, etc. worked preliminarily to a suitable size by hot grooved rolls is kept taken up to a hoop shape on a coiler 1 in the cylindrical state in which the wire is kept exerted with the work strain. Such wire is heated in an electric furnace 2 and before the wire cools down to <=600 deg.C, the wire is strained linearly in the linear direction by the upsetting machine 3 for hot working so that the shape of the work strain such as the curved deflection stored till then is annihilated. Such wire is conveyed by guide rollers 4 and is passed between a carbon electrode 5 and the die 7 so as to contact with the carbon electrode 5 heated electrically by a power source 9. A liquid lubricant is applied to the wire to provided lubricity thereto in a lubricating agent showering device 6 and thereafter the wire is passed through the heated die 7 and is thereby drawn. After the drawn wire is cooled in a cooling water showering device 8, the wire is coiled on a coiler 10.
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