The present invention relates to a heat exchanger having a housing and a helical first tube with a plurality of turns, wherein either at least one cover bar extends in a direction parallel to a cylinder axis and at least one spacer extends parallel to the cylinder axis between two of the plurality of turns of the first tube, such that the spacer forms a limit stop for movement of the two of the plurality of turns of the first tube in the direction of the cylinder axis, or the heat exchanger has a helical second tube with a plurality of turns and a helical axis, the cover bar extends in a radial direction perpendicular to the cylinder axis and the at least one spacer extends in the radial direction between one of the plurality of turns of the first tube and one of the plurality of turns of the second tube, such that the spacer forms a limit stop for movement of the one of the plurality of turns of the first tube and the one of the plurality of turns of the second tube in the radial direction, wherein the at least one spacer is connected non-rotatably to the at least one cover bar, and wherein the at least one spacer and the at least one cover bar are floatingly accommodated in the housing, at least in the direction parallel to the cylinder axis or in a circumferential direction of the housing relative to the outer wall.
F28D 7/02 - Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
F28F 9/00 - CasingsHeader boxesAuxiliary supports for elementsAuxiliary members within casings
The invention relates to a heat exchanger having a housing and a heat exchanger tube. The heat exchanger tube is arranged in the interior of the housing, and the housing has two cover plates, a hollow cylindrical outer wall with a cylinder axis, and at least two screws, wherein the outer wall extends between the cover plates such that the two cover plates extend substantially perpendicularly to the cylinder axis, and the two screws clamp the cover plates against the outer wall in the axial direction.
Tube having a length of more than 10 m suitable for high-pressure applications with internal pressure of 2 bar or more, and which is not afflicted with disadvantages exhibited by tubes produced by conventional drawing or cold pilger milling methods. The tube has a wall thickness equal to or larger than the internal diameter, an axial length of 12 m or more, a tensile strength Rm of 850 N/mm2 or more, and a mean roughness index Ra of the inner wall surface of 0.8 μm or less. Furthermore, a method of manufacturing such a tube forms a hollow into a tubular intermediate in a first forming step according to the cold forming method, the tubular intermediate thus obtained is annealed, and the annealed tubular intermediate is formed into a tube in a second forming step according to the cold forming method.
B21C 1/18 - Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes from stock of limited length
B21C 1/22 - Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C21D 9/14 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
4.
Pipe structure and method for producing a pipe structure of this type
The present disclosure concerns a pipe structure for high-pressure applications. To provide a pipe structure which overcomes at least one of the disadvantages of the pipes known from the state of the art, it is proposed according to the disclosure that the pipe structure has an inner pipe comprising a metal, wherein the inner pipe has an inner surface and an outer surface, at least one strand which surrounds the outer surface of the inner pipe and has a plurality of yarns, wherein at least one of the yarns has carbon fibres, and a protective pipe surrounding the strand and the inner pipe.
The present disclosure relates to a method for producing a rod-shaped element. In order to provide a method with which it is possible to produce a rod-shaped element which overcomes at least one of the disadvantages of the rod-shaped elements known from the state of the art, it is proposed according to the invention that the method has the steps of providing a tube made of a metal, wherein the tube has a longitudinal direction, providing at least one strand with a plurality of threads, wherein at least one of the threads has carbon fibres, introducing the at least one strand into the tube, with the result that the at least one strand extends in the longitudinal direction in the tube, and cold forming the tube, together with the at least one strand, using a forming tool, with the result that an outside diameter of the tube before the cold forming is larger than the outside diameter of the tube after the cold forming.
B21C 1/22 - Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles
B21C 37/04 - Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided forManufacture of tubes of special shape of rods or wire
B21C 37/08 - Making tubes with welded or soldered seams
6.
Downhole tubing or umbilical with sensor and method for manufacturing it
The present disclosure relates to a system having an inner structure, wherein the inner structure comprises at least one inner tube made of stainless steel and at least one sensor device with at least one sensor to measure at least one condition of the system. Under an aspect of the present disclosure a system of this type is suggested, wherein the inner structure is coated with at least one layer of at least one plastic material.
E21B 47/12 - Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
B21C 37/20 - Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies
F16L 9/19 - Multi-channel pipes or pipe assemblies
7.
TRANSPORT SYSTEM FOR A PIPE AND METHOD FOR DELIVERING A PIPE
Transport system makes it possible to transport a pipe of any length and with the required quality to the location of the use of the pipe. The transport system for a pipe has a transport platform, a receptacle for the pipe, wherein the receptacle is configured in such a manner that the pipe may be received coiled on the receptacle, a drive, wherein the drive is configured in such a manner that the pipe may be conveyed by the drive in a transport direction, and a straightening device, wherein the straightening device is configured in such a manner that the pipe can be straightened with the straightening device. The receptacle, the drive and the straightening device are arranged on the transport platform in such a manner that the pipe may be drawn automatically from the receptacle and fed to the straightening device by the drive.
B65H 49/38 - Skips, cages, racks, or containers, adapted solely for the transport or storage of bobbins, cops, or the like
B21D 3/12 - Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by stretching with or without twisting
B23D 21/00 - Machines or devices for shearing or cutting tubes
8.
Transport system for a wire or a sheet and method for delivering a wire or a sheet
Transport system which makes to transport a wire or sheet of any length and with the required quality to the location of the use of the wire or the sheet. The transport system has a transport platform, a receptacle for the wire or the sheet, wherein the receptacle is configured such that the wire or the sheet may be received coiled on the receptacle, a drive, wherein the drive is configured such that the wire or the sheet may be conveyed by the drive in a transport direction, and a straightening device, wherein the straightening device is configured such that the wire or the sheet can be straightened with the straightening device, wherein the receptacle, the drive and the straightening device are arranged on the transport platform such that the wire or the sheet may be drawn automatically from the receptacle and fed to the straightening device by the drive.
B21D 3/12 - Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by stretching with or without twisting
B21D 3/04 - Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes skew to the path of the work
Sensor for high-pressure line and method for manufacturing thereof. The sensor detects parameters or properties of fluid conducted in a high-pressure line while maintaining the high pressure of the fluid. The sensor includes an inner tube extending concentrically in the outer tube that together form a tube and at least one groove which extends in the inner surface of the outer tube or in the outer surface of the inner tube in a longitudinal direction, at least one signal line arranged in the groove, and at least one pick-up element connected to the signal line and arranged at least in the groove or in at least one recess which is provided at least in the outer surface of the inner tube or in the inner surface of the outer tube in addition to the at least one groove. The outer tube is in frictional connection with the inner tube.
F17D 5/06 - Preventing, monitoring, or locating loss using electric or acoustic means
B21C 1/22 - Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles
B21C 37/15 - Making tubes of special shapeMaking the fittings
G01M 5/00 - Investigating the elasticity of structures, e.g. deflection of bridges or aircraft wings
10.
Method for forming a hollow of a ferritic FeCrAl alloy into a tube
The present invention relates to a method for forming a hollow 26 of a ferritic FeCrAl alloy into a tube 2. While tubes made of powder metallurgical, dispersion hardened, ferritic FeCrAl alloys are commercially available, hollows made of FeCrAl alloys so far can hardly be formed into tubes of small dimensions. The major reason for the problems in forming hollows of a ferritic FeCrAI alloy into a finished product is that FeCrAl alloys are brittle. It is therefore an aspect of the present invention to provide a tube 2 made of a ferritic FeCrAl alloy having arbitrary small dimensions. Furthermore, it is an aspect of the present invention to provide a machine 1 and a method for forming a tubular hollow 26 into a finished tube 2 of a ferritic FeCrAl alloy. At least one of the above aspects is addressed by a method for forming a hollow into a tube 2 comprising the steps providing the hollow 26 of a ferritic FeCrAl alloy, heating the hollow 26 to a temperature in a range from 90° C. to 150° C., and forming the heated hollow 26 by pilger milling or drawing into the tube.
B21B 3/00 - Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences
B21C 1/00 - Manufacture of metal sheets, wire, rods, tubes or like semi-manufactured products by drawing
B21C 1/24 - Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles by means of mandrels
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
A cold pilger rolling mill including a front mandrel thrust block that has a distance of at least 30 m from a feed chuck, measured with the feed clamping carriage at the rear reversal point thereof. The distance is measured between the rear (in the feed direction of the hollow) end of the chuck of the front mandrel thrust block and the front (in the feed direction of the hollow) end of the feed chuck of the feed clamping carriage at the rear reversal point thereof.
Cold pilger rolling mill for cold forming a hollow into a strain hardened tube with a roll stand with rollers mounted pivotably thereon. Efficient milling of long hollows is enabled without reducing the quality of the manufactured tubes. The cold pilger rolling mill has an unwinding device, wherein the unwinding device is arranged and in the feed direction of the hollow is located in front of the front mandrel thrust block such that at the unwinding device a spindle being rotatable around an axis being perpendicular to the feed direction of the hollow with the hollow wound thereon is receivable and in an operation of the cold pilger rolling mill the hollow is unwindable and feedable between the chuck of the front mandrel thrust block and the mandrel bar into the feed clamping sledge and the roll stand.
B21B 21/06 - Devices for revolving work between the steps
B21B 15/00 - Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
13.
Method for manufacturing a tube of metal as well as a tube of metal
Method for manufacturing a tube of metal in which sensors are attached to tubes, which register and signal a damage of the tube. It is detrimental that protection of the sensors at these tubes against environmental influences is complex. In contrast, it is an object of the present disclosure to provide a method for manufacturing a tube, in which the signal line can be protectively mounted. To solve this object, a method for manufacturing a tube of metal is suggested with an outer tube and an inner tube, wherein a groove is drawn in an inner surface of the outer tube or in an outer surface of the inner tube and subsequently the inner tube and the outer tube are drawn together through a drawing die, wherein the inner dimension of the outer tube is reduced such that after the drawing the outer tube is force-fitted onto the inner tube.
B21C 37/20 - Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies
H05K 3/10 - Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
F16L 9/18 - Double-walled pipesMulti-channel pipes or pipe assemblies
G01M 3/18 - Investigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables, or tubesInvestigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipe joints or sealsInvestigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for valves
G01M 5/00 - Investigating the elasticity of structures, e.g. deflection of bridges or aircraft wings
14.
Method for producing a strand from stainless steel and strand made of stainless steel
A method for manufacturing a strand from a stainless steel by cold forming a billet into the cold-hardened strand and subsequently annealing the strand is provided. The method allows stainless steel strands to be produced, which have both a high tensile strength, as well as a high degree of elongation. The strand is heated to a temperature ranging from 400° C. to 460° C. while the strand is being annealed, and the cold-hardened strand is surrounded by a protective gas atmosphere during the heating process.
C21D 9/52 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for wiresHeat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for strips
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C21D 9/14 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
A process for producing a high-grade steel tube includes the steps of: providing a tubular blank of an austenitic high-grade steel, wherein the high-grade steel comprises in weight % no more than 0.02% carbon, no more than 1.0% manganese, no more than 0.03% phosphor, no more than 0.015% sulfur, no more than 0.8% silicon, no more than 17.5% t to 18.5% nickel, no more than 19.5% to 20.5% chromium, no more than 6.0% to 6.5% molybdenum, no more than 0.18% to 0.25% nitrogen, no more than 0.5% to 1.0% copper, and a remainder of iron and unavoidable impurities; and cold-forming the blank into a tube.
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
B21C 47/26 - Special arrangements with regard to simultaneous or subsequent treatment of the material
B21C 1/00 - Manufacture of metal sheets, wire, rods, tubes or like semi-manufactured products by drawing
A roll straightening machine for straightening an elongated string member includes at least one first straightening roll rotatably mounted around a first rotation axis, and at least one second straightening roll rotatably mounted around a second rotation axis. The first and second rotation axis and rolls are oblique with respect to a longitudinal axis of an elongated string member to be received in the roll straightening machine, and also oblique with respect to one another. In order to provide a roll straightening machine that can be set up flexibly for different requirement profiles, the first rotation axis is mounted on a first holding device and the second rotation axis is mounted on a second holding device. The first and the second holding devices are supported by a frame in a removable manner, which is arranged to receive a variable number of holding devices having the straightening rolls.
B21B 31/08 - Interchanging rolls, roll mountings, or stand frames
B21D 3/04 - Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes skew to the path of the work
An annealing furnace for annealing a strand of steel. The annealing furnace including a first heating apparatus for heating the strand during operation of the annealing furnace. A transport device advances the strand in a direction of transport through the annealing furnace during operation of the annealing furnace. The annealing furnace also includes a first cooling device for cooling the outer surface of the strand with a gas guide in the direction of transport behind the first heater, wherein the gas guide is arranged in such a manner that a gas flows along the outer surface of the strand during operation of the annealing furnace for cooling the strand.
C21D 9/52 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for wiresHeat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for strips
C21D 8/06 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
F27B 9/20 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatmentFurnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path
B21C 9/00 - Cooling, heating or lubricating drawing material
F27B 9/12 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity with special arrangements for preheating or cooling the charge
C21D 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor
C21D 1/613 - GasesLiquefied or solidified normally gaseous material
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
C21D 9/573 - Continuous furnaces for strip or wire with cooling
F27D 9/00 - Cooling of furnaces or of charges therein
18.
Cold pilger rolling mill and method for forming a hollow shell into a tube
A cold pilger rolling mill includes a pair of rolls rotatably attached to a roll stand, a crank drive on a driveshaft, which is rotatably mounted around a rotation axis, with a counterweight attached to the crank drive at a radial distance from the rotation axis, and a push rod with a first and a second end. The first end of the push rod is rotatably attached on the crank drive wherein, during the operation of the mill, a rotation of the crank drive is converted into a translation movement of the roll stand between a first and a second reversal position. The radial distance of the first end of the push rod from the rotation axis is adjustable, so that the distance between the two reversal positions of the translation movement of the roll stand is adjustable.
A cold pilger rolling mill for forming a tube shell to a tube includes a feed clamping carriage for receiving the tube shell and with a drive that is arranged to move the feed clamping carriage such that during the operation of the cold pilger rolling mill the tube shell moves step-by-step in the direction of the tool. A control and a sensor detect a measure of a force exerted during the operation of the cold pilger rolling mill by the tool onto the tube shell, and wherein the control is connected to the drive and the sensor. The control is arranged to regulate, during the operation of the cold pilger rolling mill, the step length per advance step with which the drive moves the feed clamping carriage to the tool as a function of the measure for the force, which measure is detected by the sensor.
A furnace muffle for an annealing furnace, the furnace muffle including a base body arranged to delimit a volume to be heated, at least one actuator connected to the base body in such a manner that the actuator, during the operation of the furnace muffle, can exert a force on the base body, at least one sensor arranged to detect a force exerted by the base body during the heating or cooling and/or a change in a length of the base body during the heating or cooling, and a control device connected to the actuator and the sensor, which is arranged so that during the operation of the furnace muffle, it controls the force exerted on the base body as a function of the force or change in length detected by the sensor.
F27B 5/18 - Arrangement of controlling, monitoring, alarm or like devices
F27B 9/08 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and chargeFurnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity electrically heated heated through chamber walls
A pilger rolling mill with a roll stand moves linearly back and forth along a movement direction and includes a crank mechanism having a rotatably supported crankshaft with a crank pin and push rod. A first end of the push rod is pivotably fastened to the crank pin and a second end is pivotably fastened to the roll stand, so that during operation of the pilger rolling mill a rotary movement of the crankshaft is converted into an oscillating movement of the roll stand along the movement direction. A compensation shaft is rotatably supported about an axis of rotation and includes a distribution of mass that is not rotationally symmetrical relative to its axis of rotation and a counter-mass. The crankshaft and the compensation shaft are connected to one another by a transmission so that a rotation of the crankshaft leads to a rotation of the compensation shaft.
A processing machine and method for planing an end surface of a finished pipe with a clamping device for the pipe to be processed via a tool holder with a planing tool, whereby the tool holder is driven by a motor and can rotate about an axis of rotation. The tool holder is driven by a motor so that it can rotate about an axis of rotation, whereby the clamping device and the tool holder are driven by a motor and can move toward one another in a direction parallel to the axis of rotation of the tool holder. The processing machine includes a cooling device that is arranged in such a manner that it cools the pipe to be processed and/or the planing tool with the aid of liquid and/or solid carbon dioxide during the operation of the device.
B23B 5/16 - Turning-machines or devices specially adapted for particular workAccessories specially adapted therefor for bevelling, chamfering, or deburring the ends of bars or tubes
B23P 25/00 - Auxiliary treatment of workpieces, before or during machining operations, to facilitate the action of the tool or the attainment of a desired final condition of the work, e.g. relief of internal stress
B23Q 11/10 - Arrangements for cooling or lubricating tools or work
B23B 1/00 - Methods for turning or working essentially requiring the use of turning-machinesUse of auxiliary equipment in connection with such methods
Pilger rolling train, which operates continuously for producing a tube, includes a pilger rolling mill for reducing the diameter of a hollow blank to form the tube, a first buffer for a plurality of tubes, wherein the first buffer has a device for bundling a plurality of tubes in a bundle, an annealing furnace for simultaneous annealing of a plurality of tubes, a second buffer for a plurality of tubes, wherein the second buffer for the tubes has a device for separating the plurality of tubes out of a bundle, and a straightening machine for straightening the separated tubes in succession, wherein the devices are disposed, in the direction of flow of the tube, in the aforementioned sequence, and wherein an automated transport device for the tube is provided between, respectively, the pilger rolling mill, the first buffer, the annealing furnace, the second buffer and the straightening machine.
B21B 39/00 - Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
B21D 3/00 - Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
C21D 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor
B21B 45/00 - Devices for surface treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
A pilger rolling mill comprising a roll stand, a flywheel on a drive shaft which is mounted rotatably about an axis of rotation, and a thrust rod having a first end and a second end, wherein the first end of the thrust rod is fixed to the flywheel at a radial spacing from the axis of rotation and wherein the second end of the thrust rod is fixed to the roll stand so that in operation of the mill a rotary movement of the flywheel is converted into a translatory movement of the roll stand, comprising a drive motor having a motor shaft, wherein the motor shaft of the drive motor and the drive shaft are connected together in such a way that a rotary movement of the motor shaft leads to a rotary movement of the drive shaft and thus the drive motor drives the flywheel. To provide a pilger rolling mill whose drive for the roll stand exhibits no or only very little wear and which in addition permits a precise displacement of the roll stand with a high degree of repetition accuracy, according to the invention it is proposed that that the drive motor is a torque motor.
Winding device with which a tube produced in a rolling installation can be wound up outside the rolling installation. The tube which has already left the rolling installation is coiled or wound up in such a winding device for transport purposes. The disclosed device and method make it possible for the tube in the finished shaped condition to be put into a transportable state downstream of the roll stand while still other portions of the tube are at the stage of the tube shell or are just being shaped. For that purpose a winding device for a tube produced in a rolling installation has a bending device for curving the tube so that it can be wound in a spiral shape around a first axis, and a holding frame, wherein the bending device is mounted to the holding frame pivotably about a second axis substantially perpendicular to the first axis.
B21C 47/04 - Winding-up or coiling on or in reels or drums, without using a moving guide
B21B 23/00 - Tube-rolling not restricted to methods provided for in only one of groups , e.g. combined processes
B21B 15/00 - Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
The invention relates to a method of increasing the dynamic pressure resistance of a metal component with a tubular inner space, in which a hard metal ball is forced under high pressure through the interior of the tubular inner space, wherein the hard metal ball has a diameter that is greater than the inside diameter of the tubular inner space before the hard metal ball is forced through.
patents
