Abstract: A turret unit for a lathe includes a turret main body M configured to be mounted to a carrier support of the machine tool, and a turret head H mounted to the turret main body M and including a turret disk H2. The turret disk is configured to be rotatable, by a first driving means D1, around a disk axis X which is an axis of rotation of the turret disk H2. The turret unit T includes a second driving means D2 for pivoting the turret head H around a turret axis Y, and the second driving means D2 is an inverted motor.

Abstract: Machine tool such as a lathe has a machine frame 110 having an upper tool carrier support portion 113, a lower tool carrier support portion 114 and a spindle carrier portion arranged between the upper and lower tool carrier support portions. A spindle carrier, is arranged on or at a height of the spindle carrier portion of the machine frame 110, supporting a main spindle 121 configured to receive a workpiece, and a plurality of tool carriers, each tool carrier being supported on a tool carrier assembly 150 being arranged on either the upper tool carrier support portion 113 or the lower tool carrier support portion 114 of the machine frame 110, wherein the machine tool also includes an auxiliary spindle carrier 130 arranged on the spindle carrier portion of the machine frame 110, for supporting an auxiliary spindle 131 configured to receive and guide a workpiece for parallel machining.

Abstract: When manufacturing a straight steel section having a joint 2 comprising a ball claw 21 and a curved claw 20 by hot-rolling a bloom vertically symmetrically to make a section blank having a flange 2A at a web 1 end (first step), vertically asymmetrically hot-rolling the section blank to adjust the size of the web and form the flange into a rough joint 2B including a projection 20A (second step), and subjecting the projection to hot bend rolling into a curved claw 20 (third step), wherein the bloom has a chemical composition comprising, in mass percentage, from 0.01 to 0.20% C, up to 0.8% Si, up to 1.8% Mn, up to 0.030% P, and up to 0.020% S; and therein the claw bending start temperature in the third step is a temperature of over Ar3 or up to Ar3-50° C., thereby achieving a depth of wrinkle flaws 10 present on the inner surface side of the curved claw of up to 0.5 mm.

Abstract: When manufacturing a straight steel section having a joint 2 comprising a ball claw 21 and a curved claw 20 by hot-rolling a bloom vertically symmetrically to make a section blank having a flange 2A at a web 1 end (first step), vertically asymmetrically hot-rolling the section blank to adjust the size of the web and form the flange into a rough joint 2B including a projection 20A (second step), and subjecting the projection to hot bend rolling into a curved claw 20 (third step), wherein the bloom has a chemical composition comprising, in mass percentage, from 0.01 to 0.20% C, up to 0.8% Si, up to 1.8% Mn, up to 0.030% P, and up to 0.020% S; and therein the claw bending start temperature in the third step is a temperature of over Ar3 or up to Ar3—50° C., thereby achieving a depth of wrinkle flaws 10 present on the inner surface side of the curved claw of up to 0.5 mm.

Abstract: The present invention provides a universal rolling mill in which rolls including width-variable rolling rolls can be replaced at a time even if the universal rolling mill is of a type in which a yoke is caused to recede upward. A concrete structure of the invention is the universal rolling mill including a pair of width-variable rolling rolls each of the rolls having a driving portion (housed in a support box) detachably joined to an end portion of a roll shaft on an operating side for varying a rolling width, the pair of width-variable rolling rolls being used as horizontal rolls, in which a receiving/passing device for receiving and passing the driving portion of an upper width-variable rolling roll from and to the rolling mill is mounted to a yoke for receiving reaction force of an upright roll on the operating side.

Abstract: An edging roll for rolling a shape having a web and flanges, including a main shaft having an eccentric shaft portion; an eccentric sleeve having an eccentric portion facing the eccentric shaft portion of the main shaft; web-restricting rollers attached to the eccentric shaft portion of the main shaft and the eccentric portion of the eccentric sleeve through bearings; flange rolling rolls attached to the main shaft and the eccentric sleeve through bearings; a flange rolling roll drive means having a pair of gear transmission means, a connection shaft, and a rotation drive means; a roll height adjustment means for integrally rotating the main shaft and the eccentric sleeve; a roll-width adjustment means for synchronously and mutually moving the main shaft and the eccentric sleeve; and further a roll width/height adjustment synchronizing means and a pair of guide rings may also be disposed.

Abstract: A guide device for shape rolling has upper and lower pairs of width-variable web guides arranged at the delivery of a shape mill. Support bases supporting the upper and lower pairs of web guides. Movable bases move the support bases horizontally on side frames whose ends are fixed to guide frames. Guide width adjusting devices individually adjust the distance between the movable bases; and guide height adjusting devices enable the side frames to ascend and descend. Preferably, upper and lower pairs of flange end guide rollers and flange-outer-surface guide rollers, which are adapted to roll while in contact with the end surfaces and the outer surfaces of the flanges, can move in the vertical and horizontal directions.

Abstract: A section steel straightener for correcting deformations in section steel, such as H-beams. The straightener allows for adjusting the width of the rollers without disassembling the apparatus, but rather by rotating sleeves to change the distance between rollers. Also disclosed is a plurality of rollers forming at least one of the fixed roller and movable roller such that the required amount of movement of the movable roller is reduced, thereby reducing idle time of the straightener.

Abstract: Adjustable width rolls are preferably used for rolling, for example, insides of H-beams of various sizes without exchanging horizontal rolls of a rolling mill. Each of the adjustable width rolls includes a roll shaft rotatably and axially movably supported relative to the rolling mill, and axially adjustable sleeve roll fixed to the roll shaft, and an axially stationary sleeve roll mounted on the roll shaft to be axially slidable but against rotatable relatively to the roll shaft. The adjustable width roll further includes an axially adjustable roll fixedly supported by the axially adjustable sleeve roll to form substantially one half of a rolling barrel of the adjustable width roll, an axially stationary roll fixedly supported by the axially stationary sleeve roll to form substantially the remaining half of the rolling barrel of the adjustable width roll, and a driving mechanism for driving the roll shaft in axial directions of the roll shaft.

Abstract: H-shaped steel products having substantially a constant web height are efficiently manufactured from workpieces after breakdown rolling by using a particular universal rolling mill comprising a pair of width variable horizontal rolls and a pair of vertical rolls in rough universal rolling and/or finish universal rolling stages without arrangement of rolls in the same size series having different flange thicknesses.