Mitsubishi Heavy Industries Limited

Mutsumi Yoshikawa

Atsushi Inoue

Rimpei Kawashita

Keiji Mizuta

Yoshiharu Ozawa

Hiroyuki Yamamura

Hiroyuki Tauchi

Isamu Takehana

Takayuki Kume

Keiji Tomimatsu

A spindle device of machine tool includes a pressure sensor () that detects a pressing force to a rod () by a drive (), a displacement sensor () that detects displacement of the rod (), a tool clamping-force detector () that detects a clamping force to a tool () by a collet () based on the pressing force to the rod () and the displacement of the rod (), and a spring-replacement-timing determining unit () that determines a replacement timing of disc springs () based on the tool clamping force and a preset biasing force characteristic value of the disc springs (), thereby allowing highly accurate determination of a replacement timing of a biasing unit by appropriately detecting a tool clamping force.

Spindle device of machine tool

Spindle inclination detectors (A,B) are equipped in columns (A,B) of a portal bridge () of a machine tool (). Each spindle inclination detector includes: a string () which hangs vertically with an upper end fixed to the column (reinforcement ()) and a lower end attached to a weight (); a gap sensor () which is attached to the string to measure a distance to a front face plate () of the column; and an oil damper (). Moreover, a spindle inclination correction controller provided to the machine tool controls a Peltier device (A,B) attached to a rear face plate () of the column, on a basis of an average distance measured by the gap sensor, and thus corrects an inclination of a spindle () due to the thermal deformation of the column by correcting thermal deformation of the column.

Spindle inclination detector and machine tool including the same

When a horizontal shaft and a piston are caused to travel to a first side with a gear coupling engaging, the revolution of the piston is designed to be restricted by meshing a spur gear with an internal gear fixed to a main body of a horizontal swivel part. On the other hand, when the horizontal shaft and the piston are caused to travel to a second side and the gear coupling thus disengages, the horizontal shaft and the piston are designed to be revolved in an integrated manner by meshing spur gears respectively with other spur gears. When the horizontal shaft and the piston travel from the first side to the second side, the spur gear is designed to be spaced away from the internal gear after the spur gear meshes with the spur gear.

Attachment for machine tool

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Ritto, Japan

Mutsumi Yoshikawa