| 摘要 |
878,709. Machine tool details. MAYNARD, H. J. Dec. 9, 1959 [Dec. 24,1958], No. 41828/59. Class 83 (3). [Also in Group XXIII] A method of mist cooling a drilling, turning or grinding tool 85 comprises providing a source of compressed air CP at constant pressure, conducting air therefrom at reduced pressure to a mist forming station 18 and thence to the tool 85, and simultaneously injecting a predetermined flow of liquid into the air at the station at a higher pressure than that of the air. The drill 85 is carried on a head 14 movable along a vertically-adjustable arm 10. Air is supplied from a line 23 to a liquid tank 15 and a line 22. The air pressure can be released by a lever 31 to allow refilling of the tank 15. A line 20 from the liquid tank passes through a control valve 36 to a needle-controlled valve 34 to which is also connected the line 22 via a reducing valve 38, which lowers the air temperature and pressure, a gauge 40 and a control valve 35. The valves 35, 36 are controlled simultaneously by a push-button 56 through solenoids 50, 52. A mist supply line 42 is connected to coolant passages 87 in the drill by way of a sleeve 60 prevented from rotation by an arm 62 engaging a frame projection 94 and having two sealing rings formed with lips which are pressed against the drill spindle 82. Exhaust air passing up the flutes clears the drill of chips. When the drill is raised clear of the work the mist blows the work surface clean. In a modification, a chip shield 101, Fig. 6, is provided together with a rigid supply pipe 100. |
