| 摘要 |
FIELD: mining.SUBSTANCE: claimed method comprises the locking of rod with crown bit by mid element and the transfer of lengthwise forces thereto to opposite sides. Prior to applying of opposed forces, the rod is cooled down while dill bit is heated. Note here that said drill bit is heated via said mid element while the rod is cooled via its flushing channel.EFFECT: higher efficiency of removal.2 cl, 1 dwg |
