Abstract: A stretch-reducing mill comprises a plurality of rolling stands laid side-by-side between an input stand and an output stand. A first group of stands adjacent to one another is next to the input stand and a second group of stands adjacent to one another is next to the output stand. The first group of stands is operated through a differential drive with two motors; the second group of stands is driven by independent single motors.

Abstract: A die exchange device for horizontal axis extruding presses comprises a supporting column provided with guides extending therealong, a carriage movable along the guides and provided with two rest shelves, each for a respective die holding slide, drive means to take each shelf to a die exchange position close to an extrusion working position of the press, and a pusher for shifting a die holding slide from the die exchange position to the extrusion working position, and vice versa.

Abstract: A continuous rolling mill for producing seamless tubes, operating on the restrained mandrel principle, has a stand-less structure which includes a load-bearing box-type framework wherein there are formed seats for accommodating working rolls and their chocks. The structure has reduced bulk in the axial direction and weight.

Abstract: The sensor is constituted by a magnetic core with pole pieces and by an electric coil wound on the body of said core. With said coil there are associated a sinusoidal current generator and impedance measurement means. A processor determines the thickness from the measured value of said impedance.

Abstract: A method is disclosed wherein, to guide a billet into a pressure-piercing mill, the same pusher is utilized as is normally provided to force the billet through the nip of the mill rolls.

Abstract: A coupling for connecting together two metal tubes end-to-end comprises a male half-coupling and a female half-coupling respectively attached to opposite ends of the tubes to be connected and made fast with each other through first and second annular connectors, respectively rigid with the male half-coupling and female half-coupling and coupled together in substantially bayonet-joint relationship. Such a coupling is specially suited to the formation of marine pilings for supporting offshore platforms.

Abstract: A milling-boring machine is described which allows various types of operations to be carried out on a workpiece of medium-large size so as to allow its complete working in a single location. The machine includes a pillar, a slide movable vertically along the pillar and a cylindrical head rotatably mounted in the slide, the head being rotatable and the slide being movable by digitally controlled drive means. The head carries two mandrels with their axes parallel to each other and parallel to the axis of the head, and at a predetermined distance therefrom, the mandrels being selectively rotatable at different speeds. Selected tools are mounted on the mandrels and on tool accessories attachable to the head. The machine further includes an accessory magazine for selectively supplying accessories to the head and a tool magazine for selectively supplying tools to the mandrels and to the tool accessories, with automatic devices for changing the accessories and the tools.

Abstract: Equipment for transferring pipes from one roller track to an adjacent parallel roller track includes at least two transfer units, each of which comprises a pipe chute extending transversely to the roller tracks and movable angularly between a lowered position below the tracks and a raised position above the tracks. In the raised position the chute is inclined downwardly, so that a pipe lifted by the chute rolls along the latter and comes to rest on a curvilinear end portion of the chute when it reaches a position above the roller track onto which the pipe is to be transferred.

Abstract: Apparatus for the transfer of mandrels from a lube conveyor to a parallel mandrel pre-insertion line comprises a plurality of transfer devices each of which has an arm for the direct transfer of the mandrels which is disappearingly movable transversely between the said conveyor and the said line and a further pair of arms, one fixed and one movable, having upper saw-tooth profiles cooperating to effect a stepwise displacement of the mandrels between the said conveyor and the said line.

Abstract: A revolving-ladle turret having a turret member furnished with a pair of ladle-carrying arms, mounted on a platform which rotates about a vertical axis. The turret member is supported by a pair of articulated linkages similar to parallelograms of the double-handle type. The upper or bridge sides of the parallelograms are horizontal and rigidly supported by the platform and extend parallel to the ladle-carrying arms. These parallelograms have their respective handles shaped at right angles and are linked to the turret member in positions which are symmetrical to it about the axis of rotation of the platform. The articulated parallelograms fundamentally constitute synchronizing devices for the displacements of all of the points of the turret member and of the attached ladle-carrying arms.

Abstract: A revolving-ladle turret having a turret member supporting a platform which rotates around a vertical axis and which is furnished with ladle-carrying arms. The turret member is supported by a pair of articulated linkages similar to parallelograms of the double-handle type. The upper or bridge sides of the parallelograms are horizontal and rigidly supported by the structure carrying the machine. These parallelograms have their respective handles shaped at right angles and are linked to the turret member in positions which are symmetrical to it with respect to the axis of rotation of the platform and which effectively resist the torque which works on the turret due to the constant unevenness of the loads which act on the turret because of variations in the amounts of materials in the ladles.

Abstract: A dummy bar wagon is provided with a chain having two dog-shaped carriers spaced therealong to engage and disengage the dummy bar for loading it onto and unloading it from the wagon respectively. The loading and unloading operations are effected automatically by means of a device which suitably varies the linear velocity of the chain and the dummy bar relative to each other.

Abstract: A mandrel-carrier head for fixed-mandrel continuous rolling mill has a horizontal hook portion engageable with the tail of the mandrel. This portion has a U-section in the direction of the rolling axis. One of the limbs or a part thereof is movable towards and away from the other limb, so as to lock the tail of the mandrel previously positioned between the limbs.

Abstract: A continuous rolling mill with crossed alternately inclined stands is described in which the working rolls and their roll chocks forming each stand are united to form a unit which can be displaced individually in a direction parallel to the axes of rotation of the said rolls. During changing of the rolls, a thrust member expels the said unit from the stand, in a direction parallel to the axes of rotation of the rolls, onto a load-carrying platform which can be tipped about an axis parallel to the rolling direction to a horizontal position on a carriage which is movable on rails along the sides of the rolling mill.

Abstract: A billet centering and control guide for an entry guide for a PPM, which is of the rectilinear-tunnel type and is formed by two L-shaped portions which are hinged together about an axis parallel to the axis of the guide. The control guide can be opened essentially like a valve to allow the removal of a billet which may be trapped therein.

Abstract: A machine tool is provided with an arrangement for increasing its precision by compensating for deviations in tool positioning caused by factors, such as elastic deformation of the machine structure, which vary in their effect in dependence on the current working state of the machine tool. The arrangement includes a compensator device arranged to physically act upon the machine tool to cancel at least one deviation component, and signal processing means controlling the action of the compensator device in dependence on the current machine working state as sensed by a plurality of transducers. The signal processing means stores data interrelating the machine working state to a corresponding appropriate magnitude of action of the compensator device.

Abstract: The present invention is directed to an overhead travelling crane for lifting and transporting a heavy load over an obstacle including a carriage with front and rear wheels mounted on independent axles for movement along respective rails. The rails engaged by the rear wheels are horizontal while those engaged by the front wheels each have a first section sloping upwardly from a starting point at one side of the obstacle, a central horizontal section extending over the obstacle and a final downwardly-sloping section. In use, a load is engaged with a support member adjacent the front end of the carriage and the carriage is driven along the rails to transport the load, the load being raised as the front wheels climb the first sections of their rails and being lowered as the front wheels descend the final sections.

Abstract: Rolling mills for rolling seamless tubes from axially pierced blanks or billets using a restrained mandrel have suffered from a high dead time in the oprating cycle due to the necessity of returning a mandrel-restraining cross-piece or other member from its final position back to its initial position through the roll stands before beginning the positioning of the next billet to be rolled. This invention overcomes the above-mentioned problem by providing an elongate axially extending recess in the mandre-restraining crosspiece which allows the next billet to be positioned before the end of the preceding rolling operation. The mandrel-restraining crosspiece is ready to be connected up immediately to the next billet when the mandrel-restraining crosspiece has returned to its initial working position, by enabling the crosspiece to pass over the billet which goes through the recess.

Abstract: The present invention is directed to a device for inserting and thrusting a bar into a double rolling pressure piercing mill (PPM) machine comprises a drum-shaped bedplate coaxially keyed to a motor-driven shaft having its axis of rotation parallel to the PPM's rolling axis, a first and a second thrust means on the drum-shaped bedplate having acting lines (R R.sub.1) parallel to the PPM's rolling axis and circumferentially spaced from each other by a predetermined center angle, a motor for angularly moving the drum-shaped bedplate from a position in which the line R coincides with the rolling axis to a second position in which the line R.sub.1 coincides with said rolling axis and vice-versa.

Abstract: A device whereby a square bar is inserted and pushed into a press-piercing mill (PPM), the bar being disposed along the rolling and drilling axis of the mill, the apparatus being characterized in that it comprises:a first thrust means (20) having a direction of action (R.sub.1) and thrusting the bar (7) at a speed set for introducing the bar into the (PPM);a second thrust means (14) having a direction of action (R) and thrusting the bar (7) at a speed set for rolling and simultaneously drilling the bar (7) in the (PPM), andan actuator (34) for simultaneously moving the first and second thrust means (20, 14) from a position in which the direction of action (R.sub.1) coincides with PPM rolling axis (A) and the direction of action (R) is at a distance from the rolling axis (A) to a position in which the direction of action (R.sub.1) is at a distance from the rolling axis (A) and the direction of action (R) coincides with the axis (A) and vice versa.