초록 ▼

Disclosed is a high speed-perforating apparatus 1 comprising a rotor 17 into and through which a cylindrical rotary shaft 11 is integrally inserted, a stator 18 disposed around the outer periphery of the rotor 17 and a core bit 13 which is directly connected to the head end portion of the rotary sha

Disclosed is a high speed-perforating apparatus 1 comprising a rotor 17 into and through which a cylindrical rotary shaft 11 is integrally inserted, a stator 18 disposed around the outer periphery of the rotor 17 and a core bit 13 which is directly connected to the head end portion of the rotary shaft. A bit 15 having an outer diameter of up to 40 mm and a cutting edge thickness of less than 2 mm is used for the core bit 13. Perforation is carried out by the core bit 13 which is rotated at a high speed of 4000 rpm or more by a direct motor 2 comprising the rotor 17 and the stator 18. A perforating time can be greatly shortened by rotating the core bit at high speed.

대표청구항 ▼

1. A high-speed perforating apparatus comprising: a cylindrical core bit having a bit for boring an annular hole in a material to be perforated; and a motor having a cylindrical stator disposed around the outer periphery of a cylindrical rotor into and through which a rotary shaft is inserted and f

1. A high-speed perforating apparatus comprising: a cylindrical core bit having a bit for boring an annular hole in a material to be perforated; and a motor having a cylindrical stator disposed around the outer periphery of a cylindrical rotor into and through which a rotary shaft is inserted and fixed, wherein the core bit is directly attached to the rotary shaft of the motor without transmission means and is directly rotated at high speed by the motor, and wherein the rotary shaft has a coolant supply hole extending along an axis thereof.