Vallourec

Vallourec Usines a Tubes De Lorraine-escaut Et Vallourec Reunies

Vallourec Sa

Creusot-loire Vallourec

Vallourec Industries

Societe Anonyme Dite: Vallourec (usines a Tubes De Lorraine-escaut Et

Pierre Peytavin

Rene J Moreau

Roland Ernst

Andre Gueussier

Marcel Garnier

Michel Giroutru

Jean-Marc Jour

The process and apparatus according to the invention relates to the continuous casting of hollow bodies of metals such as aluminium, copper, steels of all types, or other metals or alloys. The process comprises introducing a liquid metal into an annular space between an outer mold and an inner mandrel, the liquid metal being subjected in the vicinity of the mandrel to the action of a movable magnetic field which entrains it in an upward direction. The magnetic field is preferably generated by a magnetic rotor which is disposed in the mandrel. The process is used in particular for producing blanks intended for the production of non-welded pipes and tubes.

Process and apparatus for the production of hollow bodies by

Device permitting introduction of a fluid into the cooling chamber of a

The process and apparatus according to the invention concern continuous casting of hollow bodies of metals such as aluminum, copper, steels of all types, or other metals or alloys. The process comprises introducing the liquid metal into an annular space between an outer mold and an inner mandrel, the liquid metal being subjected in the vicinity of the mandrel to the action of a movable magnetic field which entrains it in an upward direction. The magnetic field is preferably generated by a magnetic rotor which is disposed in the mandrel. The process is used in particular for producing blanks intended for the production of non-welded pipes and tubes.

The method consists of a cold pilgrim rolling mill to effect a recoil movement of the chuck upstream followed by a return to its original position, at least once per rolling cycle. The period during which the chuck is withdrawn with respect to its rolling position is used advantageously for example to carry out the rotation of the chuck and/or to cause a lubricant under pressure to circulate between the chuck and the pipe. The method is applied particularly to the rolling of pipes with a large section, with high reduction rates.

Method permitting the increase of operations of cold pilger mills and an

The invention relates to a process for controlling a rolling mill having oblique rolls which is used for rolling metal rods or tubes, and to the rolling mill for carrying out the process. The rolling mill according to the invention comprises at least three rolls distributed round the rolling axis, each of the rolls having a profile generated by revolution of decreasing cross-section, the roll axes not intersecting the rolling axis, and each of the rolls exerting on the product a pressure which permits helicoidal rolling to be carried out. The process involves controlling the forward feed while keeping the angle of inclination of each of the axes of revolution of the rolls constant relative to a secant straight line, the so-called control axis, which is a straight line perpendicular to the rolling axis and intersecting said rolling axis and which traverses the zone of contact between the roll and the product to be rolled. The process also relates to a particular method of rolling in which combined variation of the feed angle and the gap between the rolls is effected during rolling.

Process for controlling a rolling mill having oblique rolls and a

The method consists of a cold pilger mill to effect a recoil movement of the chuck upstream followed by a return to its original position, at least once per rolling cycle. The period during which the mandrel is withdrawn with respect to its rolling position is used advantageously for example to carry out the rotation of the mandrel and/or to cause a lubricant under pressure to circulate between the mandrel and the pipe. The method is applied particularly to the rolling of pipes with a large section, with high reduction rates.

A method for cold rolling a tubular blank using a Pilger rolling mill, the tubular blank being rolled between a mandrel, lodged inside it, and the grooves of a pair of rolls, mounted within a stand which performs a back and forth motion along the axis of the tubular blank, the rolls being driven in rotation alternatively in one direction and in the other, in synchronism with the movements of the stand, a forward motion of the blank being done at least at proximity of the downstream neutral point. During at least a part of the return run of the stand, a holding back device, placed on the downstream side relative to the stand, prevents the displacement of the already rolled tubular blank along the rolling axis in the upstream direction during the return rolling run.

Cold rolling process for tubes, by means of a Pilger rolling mill and

The process and the device which are the object of the invention relate to the cold rolling of tubes by means of a Pilger mill. The tube blank is made to advance near each of the upstream and downstream dead centers reached by the roll stand during its forward and return cyclical movement and backward movement of the rear part of the blank is made possible during a return pass of the roll stand. This process makes possible a doubling of production without changing the operating rate of the roll stand.

Process for cold rolling of tubes by means of a pilger mill and device

A continuous vertical casting line includes an elongated vertical casing of U-shaped section with a continuous casting mold at the upper end of the casing. Within the casing are rotatable support rings for supporting guiding rollers along the axis of the blank cast by the casting mold. The roller portion of the casing supports an extractor in the form of a single pair of extraction rollers. The extraction rollers are mounted on a support rotatable by a mechanism in a stationary base. The roller support is removably retained on its base, and the base is removably retained in the casing. The arrangement permits substantial reduction in weight of the casting line and simplifies both the construction of the casting line and the removal and replacement of components.

Device for continuous casting of liquid metal especially steel

A tilting device for tilting cast metal sections formed by continuous vertical casting. The sections are formed along a casting axis of the installation and are supported by a movable support on the tilting device during their casting. The tilting device is pivoted on a horizontal axis formed by wheels resting on a support. A cable and winch tilt the device to a horizontal position in which the movable support discharges the metal section. Rails to the front and rear of the casting axis and along which the wheels roll permit displacing the tilting device with respect to the casting axis in both the vertical and horizontal position of the tilting device. Cables and winches are used to displace the tilting device. The arrangement permits maintenance and repair of either end of the tilting device during normal operation of adjacent casting lines. The entire tilting device can be rolled away to the front of the casting installation for removal and replacement.

Tilting device for vertically cast metal sections

A smoothing rolling mill having identical frusto-conical smoothing rollers ounted on axes inclined to the axis of displacement of a tube blank passing between the rollers. The axes of the rollers converge in the direction of displacement of the tube blank. The tube blank is rotated and displaced axially between the smoothing rollers in a conventional manner. If desired, the shafts which mount the rollers for rotation can be pre-loaded with respect to the tube blank.

Smoothing rolling mill

A pilgrim step rolling mill in which a carriage for advancing the product be rolled toward the roller cage is driven intermittently in synchronism with the reciprocation of the roller cage by a screw which is both reciprocated axially and continuously rotated. The carriage advances to drive the product only in response to axial movement of the screw in one direction. The overall mill arrangement reduces the number of and extent of the gearing required.

Intermittent rolling mill

The specification discloses a rolling mill for forming seamless tubes from n extruded blank wherein the mandrel is driven through the milling gap in a direction tangential to the milling rolls at a speed of from about 5% to about 10% of that of the tube blank during milling. Similarly the mandrel has a length of from about 5% to about 10% of that of the tube blank. A further pair of milling rolls may be provided, adjacent the first and rotatable about mutually parallel axes orthogonal to the mutually parallel axes of rotation of the first pair of rolls in which case the mandrel will be twice as long as that required for a single milling roll gap.

Rolling mill for forming seamless tubes, and seamless tube-making

A turning mechanism for the movement of casting ladles in steel mills of type wherein a member turning about a vertical shaft is provided with two diametrically opposite arms adapted to receive in each case a casting ladle. Each arm is fork-shaped and mounted to swing about a horizontal shaft fixed to the upper portion of the turning member. The two forked ends each receive a vertical support for the ladle pivotally mounted on a horizontal pivot received in the said forked end each support being pivotally connected at its upper end to one end of a rod whose other end is pivotally connected to the upper portion of the said turning member in such a way that the arm forms on each occasion with the corresponding rod a deformable parallelogram which constantly maintains the support in the vertical direction during the rotation of the arms.

Turning mechanism for the movement of ladles in steel mills

A drive device for clamp holder carriages of a continuously operating pilger rolling mill, comprising two carriages sliding on slides parallel to the rolling axis. Each carriage is coupled to a screw threaded rod, rotation of which causes movement of the carriage, each rod being provided with an axially movable nut held from rotation. A push rod is supported on the nuts to move the nuts and the screws in the rolling direction, each of the screws being rotatable in driving directions towards and away from the rolling mill so as to permit the return of one clamp holder carriage while the other feeds stock to the mill.

Growing community of inventors

Neuilly-sur-Seine, France

Pierre Peytavin