EP4436729A1 - System zum rueckhalten einer dornstange in einem rohrwalzwerk und verfahren zum betreiben des systems - Google Patents
System zum rueckhalten einer dornstange in einem rohrwalzwerk und verfahren zum betreiben des systemsInfo
- Publication number
- EP4436729A1 EP4436729A1 EP22809693.9A EP22809693A EP4436729A1 EP 4436729 A1 EP4436729 A1 EP 4436729A1 EP 22809693 A EP22809693 A EP 22809693A EP 4436729 A1 EP4436729 A1 EP 4436729A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- rod
- dome
- pusher
- pulling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
- B21B25/02—Guides, supports, or abutments for mandrels, e.g. carriages or steadiers; Adjusting devices for mandrels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
- B21B17/06—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a discontinuous process
Definitions
- the invention relates to a system consisting of a movable unit and an activation unit that is stationary relative to the movable unit. At least one control element, which is controlled via an actuator, is arranged on the movable unit. The actuator itself - and thus also the control element - is actuated with the aid of an actuating mechanism which is arranged on the activation unit and whose kinetic energy is transmitted to the actuator.
- the mobile unit is z.
- the dome rod retaining device can also be called dome abutment.
- the dome rods can also be expanding or perforated domes for expanding or reducing the forming cross section of a primary product.
- the actuation of the actuators and thus of the control elements typically takes place via electrical or hydraulic actuation devices, which are each arranged on the movable unit, preferably in the immediate vicinity of the actuators to be actuated.
- the power supply for these actuation devices on the movable units is then provided via a power supply chain, for example a trailing cable, or a hose feed or the like.
- the known energy supplies are limited in their possible accelerations, speeds and in their service life and have a not inconsiderable weight that has to be moved in addition to the movable unit. It is therefore often necessary to install significantly more drive power than would be required for a dynamic movement of the movable unit, which also has a negative impact on the cycle time.
- the invention is based on the object of further developing said known system and an associated known method for operating the system such that the energy supply to the actuator for the control element on the movable unit is simplified, cheaper and more flexible.
- the system is characterized in that the activation unit is fixedly mounted with respect to the traveling unit and that at least one traction element is provided for transmitting the kinetic energy of the operating mechanism to the actuator on the traveling unit for engaging the actuator.
- the stressed tension element is significantly less susceptible to faults and therefore requires significantly lower maintenance costs than the energy supply devices customary in the prior art.
- the actuation of the actuators and thus of the setting elements on the movable unit takes place in that the movement of the movable unit is superimposed on the movement of the tension element caused by the actuating mechanism. Otherwise, there is no coupling of traversing and adjustment forces.
- the pulling element is a rope, a wire, a chain or a belt, for example a toothed belt or a V-belt.
- the pulling element advantageously has a significantly lower intrinsic weight than the feed devices known from the prior art. Due to the reduced mass, the drive power that has to be applied overall for the movement of the movable unit and the energy supply device can be reduced compared to the prior art. Due to the reduced mass are also Greater accelerations and traversing speeds of the overall system are possible.
- the pulling element is also flexible. The flexibility enables the actuators on the movable unit to be actuated by the traction element in any position of the movable unit and at any time during its movement, regardless of its direction of movement. Of course, the pull element also enables the actuators to be actuated when the movable unit is at a standstill. Finally, the tension element in this configuration is also significantly cheaper than the energy transmission devices in the prior art.
- the pull element is fastened with its actuator-side end to the actuator or the actuator itself and its end remote from the actuator is fixed either to the movable unit or to the stationary activation unit or at a third location.
- the actuating mechanism of the stationary activation unit then functions as a tensioning and/or buffering device for the pulling element and is in engagement with the pulling element between the two ends of the pulling element.
- the operating mechanism is operated with a drive device or manually. It acts as a tensioning device in that it exerts a tensile force on the tension element, which is then transmitted to the actuator and the control element.
- the pulling element is already under pretension when the actuating mechanism exerts the pulling force on the pulling element; then the tensile force is superimposed with the prestress in the tension element.
- the actuating mechanism acts as a buffer device in that it accommodates or stores a certain length of the pulling element due to its design.
- the actuation mechanism typically includes at least one, often multiple, pulleys.
- these stationary and/or sliding pulleys have a mass concentration at their center, they have a low moment of inertia. This is advantageous on the one hand the actuating force of the actuators to a minimum and, on the other hand, to reduce wear on the tension element.
- the pulling element can be designed to be elastic and/or it contains a damping element.
- compensating elements are provided to compensate for an undesirable change in length of the tension elements, e.g. due to "leaning" or changed ambient temperatures.
- FIG. 0 shows the system according to the invention in an overview
- FIG. 1 shows a perspective view of a movable unit with a mandrel retaining head in an open state for the insertion of a mandrel
- FIG. 2 shows the movable unit according to FIG. 1 with a dome rod inserted and fixed radially for a forward movement towards a tube rolling mill and axially in the rolling direction;
- FIG. 3 shows an exemplary embodiment of the activation unit according to the invention with a displaceable deflection element
- FIG. 4 shows a first exemplary embodiment of the actuator for engaging a first control element
- FIG. 5 shows a second exemplary embodiment of the actuator for adjusting a second setting element in a top view
- FIG. 6 shows an exemplary embodiment of a compensation element according to the invention for the tension element
- Figures 7 shows the coupling of a push-in device to the head of one to 9 dome rods
- FIG. 10 shows the uncoupling of the push-in device from the dome rod head
- FIG. 11 shows the movable unit according to FIG. 1 with a dome rod inserted and radially and axially fixed for a backwards movement back from the tube rolling mill in and against the direction of movement.
- the invention is described in detail below with reference to the figures mentioned in the form of exemplary embodiments.
- the same technical elements are denoted by the same reference symbols in all figures.
- a reference number followed by one or two inverted commas refers in each case to a first or second exemplary embodiment of the respective technical element. If a reference number is used without a single quote, the statement linked to the reference number is generally valid, ie it applies independently of a specific embodiment.
- FIG. 0 shows the system 100 according to the invention in an overview.
- the two main components of the system can be seen, namely the movable unit 110 and the activation unit 140, which is mounted in a stationary manner in relation to the movable unit.
- the movable unit 110 has a mandrel rod retaining head 112 on which a mandrel rod 210 can be fixed or locked with the aid of actuators 120 .
- the actuators 120 are actuated via associated actuators 130.
- the actuators 130 are activated using actuating mechanisms 150 of the activation unit 140, whose kinetic energy is transmitted to the actuators 130 with the aid of tension elements 160 and via the actuators to the actuators.
- the pulling elements 160 can each be a rope, a wire, a chain or a belt, for example a toothed belt or a V-belt.
- the mandrel bar 210 serves primarily for insertion into a hollow block 220 when this is to be rolled into a tube in a tube mill 300 .
- the dome bar 210 then serves as internal support for the hollow block.
- the dome rod can also be a so-called stopper rod or perforated dome rod for expanding or reducing the forming cross section of a preliminary product by means of a dome or a pierced thorn.
- the dome rod retaining head 112 may also be called a dome abutment.
- the cleat 210 is translated and positioned on the cleat retaining head 112 by a pusher assembly 190 driven by a pusher drive assembly 198 .
- the dome rod retaining head 112 is firmly connected to a toothed rack 114 .
- the rack 114 and the mandrel retaining head 112 attached thereto are translationally displaceable in the axial direction of the rack 114 by means of a pinion drive mechanism 115 toward the tube mill 300 and back from the tube mill.
- three actuators 120′, 120′′ and 120′′′′ are arranged on the dome rod retaining head 112, of which at least the first and second actuators 120′, 120′′ can be actuated with individually assigned actuators 130.
- FIG. 1 illustrates a first exemplary embodiment of the actuator 130′ according to the invention in the form of a transmission for the first control element 120′.
- the actuator 130' has a lever 132' on its input side, to which a first pulling element 160' is connected.
- Lever 132' may be in the form of a pulley as shown in Figure 1, or a drum or guide nozzle when the first pulling member 160' is a rope or wire. If the first pulling element 160' is a belt, in particular a toothed belt, it is advisable to design the lever 132' in the form of a pulley.
- the first actuator 120' in the form of a flap automatically folds down into its parked position, as in Figure 1 shown.
- a pretensioning force is then transmitted from the output side of the transmission to its input side and in this way the tension element 160' is then pretensioned.
- the prestressing effect of gravity can be supported or reinforced by additional aids such as springs, cylinders or similar.
- the transmission transfers the pulling force exerted by the pulling element 160' from its input side to its output side in order to move the flap 120' there. from its parked position shown in FIG. 2 to its pitched position shown in FIG. 11. If the first tension element 160' is pretensioned as described, the applied tension is superimposed on the oppositely directed pretension in the tension element 160'.
- the additional pulling force must be large enough to overcome the opposing bias and raise the flap.
- the movable unit 110 and in particular the mandrel rod retaining head 112 are used to move the mandrel rod 210 into a hollow block 220 and to move the hollow block together with the inserted mandrel rod 210 into the tube rolling mill 300.
- the mandrel rod 210 is on the mandrel rod retaining head 112 with the aid of the actuators 120 definable.
- a channel 117 is formed on the dome rod retaining head 112, into which the dome rod can be inserted or pushed.
- the hollow billet 220 is formed into a tube with a desired outer diameter that is reduced compared to the hollow billet 220.
- the hollow block 220 and the tube made from it are preferably seamless.
- Figure 2 shows the movable unit 110 and in particular the dome rod retaining head 112 according to Figure 1, but here with the dome rod 210 pushed in.
- the tube mill 300 exerts a tensile force on the billet and the dome bar 210; i.e. the dome rod 210 is pulled in the direction of the tube mill 300.
- the first actuator 120' in the form of the flap is then typically folded down into its parked position according to FIG.
- the dome rod 210 is axially fixed on one side by a thickened end 216 on the head 214 of the dome rod.
- the dome rod then hits a stop 119 inside the channel 117 with the thick end 216 .
- the thickened end can be created, for example, by constricting the dome rod.
- the thickened end 216 transmits the tensile force built up by the tube rolling mill and prevents the dome rod from shooting uncontrolled in the direction of the tube rolling mill and causing damage in the process.
- the mandrel 210 is pulled back from the tube rolling mill with the aid of the movable unit 110 and pulled out of the hollow block transported away in the rolling direction W in the tube rolling mill.
- FIG. 2 illustrates how the dome rod 210 is fixed or locked to the dome rod retaining head 112 at least with the aid of the first actuator 120′ and the second actuator 120′′.
- the first actuator 120' in the form of the flap serves to lock the peg 210 in the chute 117 upon movement of the peg retaining head 112 with the peg 210 axially back from the tube mill 300.
- the flap 120' serves as a safety element to prevent uncontrolled movement of the mandrel bar 210 in the event of a sudden deceleration of the deceleration force exerted on the mandrel bar by the traveling unit for pulling the mandrel bar 210 out of the hollow billet in the tube rolling mill.
- the dome rod 210 is moved towards the tube rolling mill 300, the flap 120' is typically folded down due to the force of gravity, as described above.
- the second actuator 120'' serves to secure the dome rod 210 in the radial direction.
- the second actuator 120′′ is moved/extended from the rest position shown in FIG. 1 into the contact position shown in FIG.
- the movement into the adjustment position takes place with the aid of a compression spring 136, as described in more detail below with reference to FIG.
- the second actuator limits a movement of the dome rod 210 in the radial direction, ie in particular the second actuator 120′′ prevents the dome rod 210 from being lifted out of the groove 117 or from the third actuator 120′”.
- the second actuator 120′′ is preferably designed in the form of an asymmetrical polygonal disk or is adapted to the diameter of the dome rod 210 used in each case by means of shims or the like.
- the individual grade sections on the circumference of the second actuator each have a different shortest distance from the central axis 124 of the second actuator and are therefore suitable for limiting the radial freedom of movement of dome rods 210 with different diameters.
- the second actuator 20′′ is advantageously extended both when the dome rod 210 moves forwards towards the tube rolling mill 300 and when the dome rod moves back from the tube rolling mill into its adjustment position according to FIG.
- the third actuator 120′′′ which is also shown in FIGS. 1 and 2, is, as indicated in FIG.
- the dome rod 210 is generally not mounted without play in the groove 117 in the radial direction - even when the second actuator 120" is extended - because the second actuator 120" is also in the extended adjustment position according to FIG. 2, the dome rod 210 in the channel 117 does not necessarily touch or even press into the channel.
- the dome rod 210 is adjusted or aligned to the rolling center of the tube rolling mill 300 only when the dome rod 210 is adjusted from below with the aid of the eccentric shaft or a similar adjustable device in the (radial) direction towards the extended second actuator 120", so that the dome rod 210 is then aligned with the center of the tube rolling mill.
- the eccentric shaft as the third actuator is typically rotated manually from its rest position to the applied position and back.
- FIG. 3 illustrates the actuating mechanism 150 according to the invention.
- the mechanism shown there preferably applies equally to the first and the second exemplary embodiment of the actuating mechanism.
- the actuating mechanism 150 is used to apply a tensile force to the pulling element 160.
- the actuating mechanism 150 has at least one movably mounted deflection element 152, preferably in the form of a deflection roller or guide nozzle.
- the displaceable deflection element 152 can be displaced according to the vertical double arrow at least with a movement component in, for example, the vertical direction, ie transversely to the main horizontal direction of the tension element.
- the actuating mechanism 150 engages with the tension element 160 in such a way that the tension element wraps around the displaceable deflection element 152 at least in an angular range a.
- the displacement of the deflection element 152 can be done manually or with the help of a Drive device 156 done. With said displacement of the displaceable deflection element 152, at least with a component transverse to the main course of the respective tension element 160, for example in the horizontal direction, as shown in FIG. 3, a desired tensile force is applied or exerted on the tension element 160.
- the actuating mechanism according to Figure 3 can also have at least one, but preferably two further, stationary deflection elements 134, which are arranged in front of and/or behind displaceable deflection element 152 in the direction of extension of tension element 160 and are separated from tension element 160 at least are wrapped in an angular range ß.
- stationary deflection elements 134 are arranged in front of and/or behind displaceable deflection element 152 in the direction of extension of tension element 160 and are separated from tension element 160 at least are wrapped in an angular range ß.
- Other positions of the deflection elements relative to one another, resulting in different angles of wrap, are possible and also allow other directions of movement of the actuating mechanism 150.
- the actuating mechanism shown in FIG. 3 with the three deflection elements shown as an example is part of an activation unit 140 which is arranged in a fixed manner in relation to the movable unit 110 .
- the stationarily arranged but rotatably mounted deflection elements 134 serve to guide the tension element 160 to the movable deflection element 152 and from this path with as little friction as possible. They also ensure that the kinetic energy introduced by the displaceable deflection element 152 into the tension element 160 , ie tensile force, is also introduced as far as possible into the tension element 160 and does not fizzle out in an undesired displacement of the tension element 160 .
- the actuating mechanism 150 shown in FIG. 3 serves as a tensioning device for the pulling element 160 because it exerts a pulling force on the pulling element 160 as a result of its movement or the transmission of its kinetic energy.
- the actuating mechanism 150 also serves as a buffer device for the pulling element 160 because it is a partial length or stores a change in length of the tension element as a length of tape.
- FIG. 4 shows a side view of the mandrel rod holding head according to FIGS. 1 and 2.
- the gearing for controlling the first actuator 120' in the form of the flap, which is pivotably mounted about the axis of rotation D1 can be seen clearly.
- the pulley 132' is in articulated mechanical connection with the flap 120' via a lever.
- the cable pulley 132' in FIG. 4 is rotated over a specific angle range in the clockwise direction.
- the mechanical coupling with the flap 120' causes the flap 120' to be pulled up from its folded-down position shown in Figure 4 into its set-up position shown in Figure 11, preferably into the constriction 212 shown in Figure 2 on the surface of the mandrel rod 210.
- FIG. 5 illustrates a second actuator 130 “for adjusting the second control element 120” in the form of said polygonal disc.
- the second actuator has a compression spring 136 .
- the second tension element 160′′ is provided for tensioning the compression spring.
- the compression spring 136 exerts a preload on the second tension element 160′′.
- a reduction in the tensile force causes the compression spring to relax 136 and thus a reverse displacement of the second actuator 120" from the retracted position to the contact position shown in Figure 5 above the dome rod 210.
- the compression spring is arranged in a direction transverse to the main laying direction of the second tension element 160", according to Figure 5 at the second actuator 160" a stationary deflection element 134" in the form of a deflection roller is provided for the corresponding deflection of the tension element 160" and the tensile force F" exerted on it.
- a damping element 163 can be built into the traction cable in order to dampen any jerky effects of force on the traction cable. This also applies analogously to the first tension element 160'.
- Figure 6 shows said rack 114 to which the mandrel rod retaining head 112 is rigidly connected.
- the toothed rack 114 is moved in a translatory manner in its longitudinal direction with the aid of the pinion drive device 115 according to FIG. With the movement of the rack, the attached mandrel retaining head 112 is also moved in the longitudinal direction of the rack toward and away from the tube mill, as described above.
- the two tension elements 160 are also shown in FIG.
- the compensating elements 165 are shown, for example in the form of spindles, for applying a preload (in addition to the preload due to the weight force in the case of the first actuator 120' and/or to the preload due to the compression spring 136 in the case of the second actuator 120"). on the tension elements 160 and/or to compensate for an undesired change in length of the tension elements 160.
- the compensation elements can be used to adjust the actuators.
- the deflection rollers it is recommended for all the deflection rollers to be designed in such a way that they have a mass concentration at their respective centers, because with this construction the inertia element of the individual deflection rollers can be kept small.
- the above-mentioned advantage of a damping element in the tension element can also be realized in that the tension element is designed to be elastic to a certain extent.
- exchangeable connections are provided on at least one end of the tension element 160 for easy release and optional replacement of the tension element as an exchangeable part from the movable unit, the actuator or the control element and/or the mainland.
- a monitoring device 170 can be set up to monitor the position, the speed or the acceleration of the movable unit 110.
- a further monitoring device 180 can be provided to monitor wear, abrasion or an undesired elongation of the tension element 160. All monitoring devices can be mechanical, optical or work electronically.
- the figures show the system as a first exemplary embodiment in the form of a dome rod retaining device in the tube rolling mill 300 with the movable unit 110 as a dome rod retaining head 112 with the channel 117 for receiving the dome rod 210.
- the system 100 according to the invention is operated as follows:
- the tensile force F are exerted on the tension element 160 both during the process of the movable unit 110 and during its standstill, regardless of the respective relative position of the movable unit and the activation device with the actuating mechanism to each other.
- FIGS. 7 to 9 illustrate the coupling of a pusher 190, also known as a pusher, to the mandrel rod 210.
- the pusher 190 consists of a rod 193, at one end of which a foldable locking flap 192 is attached.
- the push-in device 190 can be displaced in the axial direction of the rod with the aid of a drive device 198 via the rod 193 , for example a toothed rack.
- the drive device 198 is in engagement with the rod 193, in particular the toothed rack.
- pusher 190 is slidably mounted within a first pusher coupling device 191 .
- the push-in coupling device 191 is fastened, for example, to the stationary activation unit 140, preferably in an axially adjustable manner. It is mounted on the activation device 140 in such a way that the pusher 190 is slidably mounted in it parallel to the toothed rack 114 of the movable unit 110 in order to have stepless adjustment options.
- FIG. 7 shows the pusher 190 with the locking flap 192 open.
- the opening of the locking flap 192 shown is realized by the guide bolts 197, optionally with sliding or roller guides, on both sides of the locking flap in a first link guide 195 on the insides of the first pusher coupling device 191 be positively guided in such a way that the locking flap 192 is open at the position shown in FIG.
- the locking flap is moved progressively further towards the mandrel head 214 via the rod 193 within the first pusher coupling device 191, as is illustrated in the further Figures 8 and 9.
- the first link guide 195 has a raised straight section in the push-in direction (see arrows in the figures), so that the locking flap is always open when its guide bolts 197 slide along it.
- the first link guide 195 has a ramp section that slopes downwards in the direction of push-in, which ensures that the locking flap, when the pusher approaches the head 214 of the dome rod 210, lowers onto the head 214, as described above .
- the dome rod 210 is then axially displaced into the channel 117 of the movable unit 110 with the aid of the coupled pusher 190 .
- this direction of displacement is shown from right to left.
- the guide bolts 197 of the locking flap 192 meet the start of a second link guide 196 of a second push-in coupling device 194
- the second link guide 196 is designed in such a way that the guide bolts 197 and thus also the locking flap 192 are raised when the pusher 190 is pushed into the second pusher coupling device 194 coming from the right, ie coming from the first coupling device 191.
- the dome rod 210 can still be inserted in the axial direction into its actual desired position within the channel 117.
- its locking flap 192 initially remains open so far that it is no longer in engagement with the head 214 of the dome rod 210 . Only when the kicker 190 so far retracted so that the locking flap 192 is no longer located over the head 214 of the dome rod, it is transferred back to its lowered position.
- the second link guide 196 is designed in such a way that, in cooperation with the guide pin 197 of the locking flap, it implements the movement of the locking flap as described and desired.
- the end of the second link guide 196 that is remote from the chute is initially equipped with a ramp section that rises in the push-in direction (from right to left in the figures), which then transitions into a straight section of constant height as the chute 117 is approached.
- the guide bolts 197 and thus also the locking flap are raised to the height level represented by the straight section. If the pusher is displaced along the straight section, the locking flap remains constantly open.
- Figures 7 to 10 illustrate the insertion of the mandrel rod 210 in the direction of insertion into the groove 117 on the mandrel retaining head 112.
- the first pusher coupling device serves to couple the pusher 190 to the mandrel rod 210 and the second pusher coupling device to decouple the pusher from the dome pole.
- the process can also be reversed, ie the dome rod 210 is then withdrawn from the channel 117 .
- the second pusher coupling device is used to couple the pusher 190 and the first pusher coupling device is used to uncouple the pusher 190 from the dome rod 210.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021213367 | 2021-11-26 | ||
| DE102022202679.9A DE102022202679A1 (de) | 2021-11-26 | 2022-03-18 | System und Verfahren zum Betreiben des Systems |
| PCT/EP2022/079617 WO2023094089A1 (de) | 2021-11-26 | 2022-10-24 | System zum rueckhalten einer dornstange in einem rohrwalzwerk und verfahren zum betreiben des systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4436729A1 true EP4436729A1 (de) | 2024-10-02 |
Family
ID=84361357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22809693.9A Pending EP4436729A1 (de) | 2021-11-26 | 2022-10-24 | System zum rueckhalten einer dornstange in einem rohrwalzwerk und verfahren zum betreiben des systems |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20250235913A1 (de) |
| EP (1) | EP4436729A1 (de) |
| JP (1) | JP7832322B2 (de) |
| MX (1) | MX2024006183A (de) |
| WO (1) | WO2023094089A1 (de) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2535949A (en) * | 1945-01-11 | 1950-12-26 | Nat Tube Co | Mandrel positioning device for tube mills and the like |
| JPS53132937U (de) * | 1977-03-28 | 1978-10-21 | ||
| FR2483808A1 (fr) * | 1980-06-06 | 1981-12-11 | Vallourec | Banc de retenue de mandrin pour le mandrin qui porte un tube dans un laminoir |
| AT514894B1 (de) | 2013-09-25 | 2016-04-15 | Gfm Gmbh | Vorrichtung zum Schmieden eines Hohlkörpers aus einem vorgelochten Hohlblock |
| IT201700023064A1 (it) | 2017-03-01 | 2018-09-01 | Danieli Off Mecc | Laminatoio per la laminazione di elementi astiformi cavi o comunque concavi |
-
2022
- 2022-10-24 MX MX2024006183A patent/MX2024006183A/es unknown
- 2022-10-24 JP JP2024525752A patent/JP7832322B2/ja active Active
- 2022-10-24 EP EP22809693.9A patent/EP4436729A1/de active Pending
- 2022-10-24 WO PCT/EP2022/079617 patent/WO2023094089A1/de not_active Ceased
- 2022-10-24 US US18/697,787 patent/US20250235913A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| MX2024006183A (es) | 2024-06-11 |
| JP7832322B2 (ja) | 2026-03-17 |
| WO2023094089A1 (de) | 2023-06-01 |
| US20250235913A1 (en) | 2025-07-24 |
| JP2024541267A (ja) | 2024-11-08 |
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