Yamazaki Mazak Corporation

Jojiro Kimura

Hiroki Ikuta

Hiroki Tazawa

Makoto Tahara

Yoshikuni Ohta

Nobuhiro Sakai

Hiroshi Kondo

Hiroshi Yamane

Yuta Miyashita

A table rotation device includes a bearing assembly, a table support member, a support block, and a cooling block. The bearing assembly includes a fixed ring, a movable ring, and rolling elements provided between the fixed ring and the movable. The movable ring is rotatable about the rotation axis. The table support member is connected to the movable ring so as to fix a position of the table support member relative to a position of the movable ring. The support block is connected to the fixed ring so as to fix a position of the support block relative to a position of the fixed ring. The cooling block is connected to at least one of the fixed ring and the support block such that the cooling block is in contact with both the fixed ring and the support block. The cooling block provides a cooling passage.

Table rotation device and machine tool

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.

Growing community of inventors

Ogaki, Japan

Jojiro Kimura