Yamazaki Mazak Corporation

Hiroki Tazawa

Jojiro Kimura

Hiroki Ikuta

Yoshikuni Ohta

The invention provides an improved seal structure of cutting fluid supplied to a spindle of a milling spindle. The milling spindlecomprises a spindlesupported within a housing via a bearing, and a drawbarhaving a through coolant passage. The cutting fluid Cpassing through the rotary jointandis sent to the through coolant passage, but a portion thereof is collected in a drain chamber. A rotation memberis attached to a rear end portion of the spindle, which is equipped with a labyrinth devicehaving a lip seal member. An air supply memberhas two air seal membersand, and air Ais sent toward the labyrinth device, by which an air seal is formed.

Milling spindle of machine tool

The invention provides an improved drain structure of a cutting fluid supplied to a spindle of a milling spindle. The milling spindlecomprises a spindlesupported within a housing via a bearing, and a drawbarhaving a through coolant passage. The cutting fluid Cpassing through the rotary jointandis sent to the through coolant passage, but a portion thereof is collected in a drain chamber. When the pressure within the drain chamber rises, the drain devicepushes open the ballresisting against the spring, and the cutting fluid Cis discharged to the exterior.

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Konan, Japan

Hiroki Tazawa