Mitsubishi Heavy Industries Limited

Mitsubishi Jukogyo Kabushiki Kaisha

Kawasaki Steel Corporation

Keiji Mizuta

Kazuo Morimoto

Ritsuo Hashimoto

Akira Kaya

Masashi Yoshikawa

Tatsufumi Aoi

Yoshiki Mito

Hironori Fujioka

Hideaki Furumoto

Tetsuo Ichikizaki

Rimpei Kawashita

Akira Kishida

Mikio Yamamoto

Jae-Young Lee

Kanehisa Miyaguchi

Kyung-Zoon Min

Hiroshi Aratani

Junsou Fukumori

Akira Watanabe

Osamu Miyamoto

Yukio Hiasa

Yoshiharu Ozawa

Mutsumi Yoshikawa

Shinsaku Kimura

Shuji Maniwa

Young-Gil Seo

Jung-Do Park

Kenji Hamanaka

Yasuyoshi Takeoka

Harumasa Muramoto

Jyunsou Fukumori

Shinji Hirai

Jyun Sakamoto

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

A spindle apparatus of a machine tool comprises a main spindle rotatably supported in a housing via bearings. A helium circulation system is provided for introducing helium, lower in density and fluid pressure than air, through a helium supply port into a gap on the outer periphery of the main spindle within the housing, and for discharging helium to the outside through a helium discharge port. The main spindle is rotated in an atmosphere of the helium. The spindle apparatus is simple in structure, but can minimize the power loss of the main spindle and reduce the motor power, and also gives a cooling effect.

Spindle apparatus

An induction heating device is disclosed for heating a rolling roller by induction heating so as to equalize the diameter of the rolling roller. The device includes an induction heater and a means for moving the induction heater to a portion of the roller surface to be heated, while the distance from the induction heater to the surface is maintained constant. An electric power supply means supplies electric power to the induction heater, and a means is provided for adjusting the quantity of heat to be produced by the induction heater according to the quantity of heat that is required by the portion of the roller to be heated. The heat quantity adjusting means includes a frequency control means for controlling the frequency of electric power supplied to the induction heater, wherein the frequency control means adjusts the frequency of electric power within a predetermined frequency range to a frequency which is suitable to produce the quantity of heat required by the portion of the rolling roller to be heated. The greater the amount of heating that is required, the higher the frequency utilized. Preferably, the frequency is adjusted within a range of from about 25 to about 200 kHz.

Induction heating device for rolling roller and method of induction heating

A plurality of finishing mills for finish rolling a rolled material are arranged in a row to construct a finishing mill group, 1st to 3rd surface coolers for cooling the surfaces of the rolled material are provided on the entrance side of the 1st to 3rd finishing mills of the fishing mill group, and the range of cooling of the rolled material by the surface coolers are set to be a range of 0.3 to 1.5 m toward the upstream side from a position separated by 1.5 m or less from the center of the work rolls of each of the finishing mills toward the entrance side of each of the finishing mills.

Method and system for suppressing formation of scale defects during hot

A housingless rolling mill having an upper and lower work roll, upper bearing blocks and lower bearing blocks for supporting the upper and lower work rolls, and screw-down cylinders for pulling the upper and lower bearing blocks vertically toward each other. The screw-down cylinder is tiltable with the use of upper and lower spherical. Legs of the lower bearing block are turnable in a roll cross direction. Lower cross cylinders are provided at the lower bearing block, and upper cross cylinders are provided at the upper bearing block to enable the work rolls to cross at an angle .theta.. Thus, a strip material is rolled to a satisfactory shape and thickness with the upper work roll and the lower work roll crossing each other.

Housingless rolling mill

A hot rolling line is constructed by a pair or a plurality of pairs of rolling rolls disposed opposingly on an upper side and on a lower side of a workpiece (1) to be rolled that is pinched in between the rollers. A descaling apparatus (5) has jet flow nozzles disposed so that two jetted flows, being liquid, gas or plasma, are opposing flows so as to collide with the surface of a strip on the upstream side of the rolling rolls and then collide with each other. The jet flow nozzles are disposed, so as to incline in a direction to face each other so that the angle of inclination is 15.degree. to 60.degree. from the horizontal direction of the strip surface.

Hot rolling mill

A roll charged with a heat transfer medium includes a heater which is easy to replace and measures by which the temperature in the axial direction of the roll can be kept uniform during operation. A hollow portion of the roll, which can be opened to the atmosphere, is located at a central axial portion of the roll. The heater is a rod-shaped heater and extends along the central longitudinal axis of the hollow portion. Metal having a low melting point is provided between the heater and an inner peripheral surface of the hollow portion. A heat transfer medium is charged in the hollow portion at the periphery thereof. The heat transfer medium may contact a circumferential part of the heater. In addition, a spiral groove or fin may be provided on an internal surface of the hollow of the portion of the roll body that is charged with the heat transfer medium.

Roll charged with heat transfer medium

A rolling method and machine provides for decreasing the rolling load of work rolls of a rolling mill for a given reduction ratio achieved thereby. A pair of pinch rolls upstream of the work rolls have projections that form a large number of recesses in one or both surfaces of a metal workpiece. A lubricating agent is forced into the recesses in the region of contact between the workpiece and the work rolls. As a result, when the workpiece is rolled by the work rolls the lubricating agent is retained in the recesses such that the recesses progressively are flattened, thereby causing the lubricating agent to form a boundary film between the portion of the workpiece being rolled and the work rolls. The recesses are controlled to regulate the dimension of the length of each recess in the direction of rolling of the workpiece, to regulate the inclination of front and rear walls of each recess, and to regulate the total area of the recesses relative to the total surface area of the workpiece.

Method and machine for rolling a metal workpiece at a reduced rolling

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Hiroshima, Japan

Keiji Mizuta