Milling spindle of machine tool
AssigneeYamazaki Mazak Corporation
InventorsHiroki Ikuta, Hiroki Tazawa, Jojiro Kimura
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Abstract
The invention provides an improved drain structure of a cutting fluid supplied to a spindle of a milling spindle. The milling spindle 100 comprises a spindle 20 supported within a housing via a bearing 16, and a drawbar 24 having a through coolant passage 22. The cutting fluid C1 passing through the rotary joint 40 and 50 is sent to the through coolant passage 22, but a portion thereof is collected in a drain chamber 110. When the pressure within the drain chamber rises, the drain device 150 pushes open the ball 160 resisting against the spring 170, and the cutting fluid C1 is discharged to the exterior.
Claims2
A milling spindle of a machine tool comprising:
- a spindle supported via a bearing within a housing of the main spindle;
- a motor disposed within the housing for driving the spindle directly;
- a drawbar inserted slidably within the spindle;
- a through coolant passage disposed in an axial center of the drawbar for supplying cutting fluid;
- a rotary joint disposed on a rear end side of the drawbar for sending the cutting fluid supplied from a fixed side toward the rotating spindle;
- a drain chamber disposed within the housing for storing the cutting fluid leaked from the rotary joint;
- a drain passage communicating the drain chamber with an exterior of the housing;
- and
- a drain device disposed within the drain passage.
Dependencies are inferred from the claim text.