Abstract: An expansion forming apparatus that shapes a metal material with a die includes an electrode that comes into contact with the metal material and performs energization heating, and an electrode mounting unit having an electrode movement actuator that moves the electrode along an extension direction of the metal material during heating.

Abstract: A method of manufacturing a flaring-processed metal pipe from a hollow shell including a plurality of portions having different deformation resistances in a circumferential direction is provided, the method includes: among the plurality of portions, specifying a portion having a relatively small deformation resistance as a low deformation resistance section, and a portion having a relatively large deformation resistance as a high deformation resistance section; and press-fitting a pipe expansion punch into the hollow shell such that a thickness reduction rate of the low deformation resistance section is smaller than a thickness reduction rate of the high deformation resistance section.

Abstract: An apparatus for preparing a tube end for rod drawing with a floating mandrel has a releasable holder for the tube end centered on an axis, a frustoconical and spreadable floating mandrel, and a device for inserting the mandrel into the tube end and spreading the mandrel to flare the tube end. The apparatus further has a feed mechanism for inserting the floating mandrel into the tube end and/or a deforming device for making at least one indentation in the tube for holding the floating mandrel.

Abstract: A tool for removing a swaged fastener from a piece of equipment tubing includes, in combination with a slide hammer component, a multiple segment fastener that can be manually rotated between respective stations. The segments, around a central base, include: (a) a large hollow collar station for hammer-sliding back an innermost locking nut of the swaged fastener; (b) a large rounded-slit station for reverse-hammer sliding off an outermost ferrule of the swaged fastener; (c) an elongated tube station sized to fit over and abut a front end of the equipment tubing for hammer-sliding to push back its innermost ferrule; and (d) a small, rounded-slit station for positioning behind the pushed back innermost ferrule and reverse hammer-slide it off of the equipment tubing. A related method is also disclosed.

Abstract: An apparatus for expanding and belling a tube is provided including a receiver for supporting a first end of the tube. A stripper block assembly orients a second end of the tube along an axis. The stripper block assembly includes a first grip and a second grip movable in and out of engagement with a surface of the tube. The apparatus also includes a movable belling tool axially aligned with the tube. The belling tool bells a desired length of the tube and supports the second end of the tube. An expander tool is arranged to pass through the axially aligned tube to expand the tube. The expander tool includes an expander rod and an expander bullet. A portion of the expander bullet has a diameter larger than the diameter of the tube.

Abstract: A forging press device for valve including an upsetter in which a plurality of primary forming stages are provided, a forging press main body adjacent to the upsetter, that secondarily forms a primary formed workpiece, and a workpiece conveyance/carry-in device which grips and conveys the workpiece, to carry it into the forging press main body, the device in which the workpiece conveyance/carry-in device is composed of a high speed multi jointed robot capable of circling around a vertical shaft, which has an arm (a chuck) gripping the workpiece. In accordance with the invention, it is possible to provide a forging press device for valve in which the number of deliveries of workpiece from the upsetter to the forging press main body is decreased, which speeds up a valve forging line, and improves the production efficiency.

Abstract: A compression tool for compressing and flattening one or both ends of a length of corrugated tubing commonly used for making solar installations. A threaded force-transmitting driver is located within a threaded bore of a force-transmission cylinder. A clamp is disposed in surrounding engagement with the corrugated tubing. Tube retaining lips of the clamp are received between an adjacent pair of corrugatings to hold one end of the corrugated tubing in stationary axial alignment with the force-transmitting driver. A rotational force applied to the threaded force-transmitting driver causes the driver to rotate and move through the threaded bore of the force-transmission cylinder. A compression head at the front of the driver is correspondingly moved towards and into contact with the end of the tubing to compress and flatten the end to prevent a nut from sliding off the tubing.

Abstract: A tool kit including a clamping structure formed of dual clamping bodies that define a cylindrical projecting member when the clamping bodies are united, a force transfer adapter, a substantially cylindrical force applying member having a tapered end and an elongated yoke having a longitudinal bore defined therein, wherein the first end of the yoke and the cylindrical projecting member have cooperating features for facilitating a non-permanent engagement with one another when the dual clamping bodies are united, and wherein the second end of the yoke and the force applying member include cooperating features for facilitating the gradual application of force to the force transfer adapter.

Abstract: A method tor hoi forging at least one end of a steel reinforcing bar (i.e., a rebar) to simultaneously form a wide head and threads funning around the head during a single step whereby to enable the bar to be coupled end-to-end an adjacent steel bar to be used, for example, to reinforce a precast concrete structure. The end of the bar is first preheated, and the heated end is surrounded by a closing die having a threaded geometry. The die is then nested within and closed around the heated end by an annulus ring of a hydraulic press, or the like. A hydraulic ram of the press is moved through the annulus ring and into engagement with the heated end of the rod so as to apply a compressive force thereto. The metal of the heated end flows into the die so as to be enlarged therein and assume the threaded geometry of the die.

Abstract: The present invention solves a problem with conventional tube expanding method for heat exchanger tubes that is susceptible, when carrying out tube expansion on U-shaped heat exchanger tubes that have a narrower diameter than in the past and forming flare portions in opening portions that have been subjected to tube expansion, to a buckling phenomenon at boundaries between straight portions and hairpin portions of the heat exchanger tubes or a vicinity thereof. Opening portions of U-shaped heat exchanger tubes 56 that pass through a fin layer 54 protrude from an upper end surface of the fin layer 54, hairpin portions 56b of the heat exchanger tubes 56 protrude from a lower end surface of the fin layer 54, and tube expanding billets 22 are inserted into each opening portion of the heat exchanger tubes 56 to carry out primary tube expansion that expands the diameter of each straight tube portion 56a of the heat exchanger tubes 56 to integrate the heat exchanger tubes 56 and fins 50.

Abstract: A compression tool for compressing and flattening one or both ends of a length of corrugated tubing commonly used for making solar installations. A threaded force-transmitting driver is located within a threaded bore of a force-transmission cylinder. A clamp is disposed in surrounding engagement with the corrugated tubing. Tube retaining lips of the clamp are received between an adjacent pair of corrugatings to hold one end of the corrugated tubing in stationary axial alignment with the force-transmitting driver. A rotational force applied to the threaded force-transmitting driver causes the driver to rotate and move through the threaded bore of the force-transmission cylinder. A compression head at the front of the driver is correspondingly moved towards and into contact with the end of the tubing to compress and flatten the end to prevent a nut from sliding off the tubing.

Abstract: Pipe to be upset is conveyed via walking beam though a series of induction heating coils and one end is heated to a maximum temperature of 2350 degrees F. Thereafter, a robot transports the pipe into a forging machine where the pipe end is upset in one or more die pockets. For those types of pipes where the pipe end temperature falls below an acceptable temperature during upsetting, the robot delivers the pipe end to an auxiliary induction heating coil and is re-heated to an acceptable forging temperature. The robot then transports the pipe back into the forging machine where the pipe end is forged to its final upset dimensions.

Abstract: In a heading device for elongate workpieces having a hydraulic chucking unit and an shaping ram, which is movable axially from a retracted idle position against the workpiece, the chucking unit comprises a housing having a sliding body which is hydraulically displaceable in the axial direction of the workpiece from a starting position into a clamping position (and vice versa), in which at least two chucking segments which are situated uniformly around the workpiece are inserted, which, on their side facing toward the shaping ram, press against a locking plate which is inserted into the housing and can be fixed therein, are movable radially against the workpiece by a displacement of the sliding body in its clamping position, and each receive at least one clamping jaw, which can be pressed by the chucking segment holding it radially against the workpiece for its clamping.

Abstract: A tool kit including a clamping structure formed of dual clamping bodies that define a cylindrical projecting member when the clamping bodies are united, a force transfer adapter, a substantially cylindrical force applying member having a tapered end and an elongated yoke having a longitudinal bore defined therein, wherein the first end of the yoke and the cylindrical projecting member have cooperating features for facilitating a non-permanent engagement with one another when the dual clamping bodies are united, and wherein the second end of the yoke and the force applying member include cooperating features for facilitating the gradual application of force to the force transfer adapter.

Abstract: Tools for expanding (i.e., flaring and swedging) the ends of metal tubes are configured for attachment to a powered impact hammer, such as an air hammer. A swedging tool for swedging an end of a metal tube has a swedging body with a die section for expanding the tube when driven thereinto and a flanged shank attached to the swedging body and configured for engagement by a powered impact hammer. A flaring tool for flaring an end of a metal tube includes a flaring body having a die section for flaring the tube when driven thereinto. A flanged shank is attached to the flaring body and configured for engagement by a powered impact hammer. A method for expanding an end of a metal tube entails attaching a die body for expanding the end of the metal tube to a powered impact hammer, aligning the die body with the inner diameter of the metal tube, activating the powered impact hammer, and urging the die body a determined distance into the metal tube.

Abstract: After insertion of a mandrel (23) into a blank tube (20) in the form of an electric welded tube, a parallel swaging operation is carried out by moving a cylindrical die (24) to cause the end of the blank tube (20) to contact tightly with a parallel forming portion (27) of the mandrel (23). After completion of parallel swaging operation, the die (24) is withdrawn out of the blank tube (20) and a push-die (33) is caused to move to the blank tube (20) from a radially outward position while leaving the mandrel (23) inside the blank tube (20) so that a weld bead on the blank tube (20) can be flattened by cooperation with the mandrel (23).

Abstract: Improved slide lock apparatus used in bending apparatus to bend stock to an acute angle. A hydraulic cylinder with a ram extendable under hydraulic pressure provides the bending power. The ram automatically retracts a slide from an first outward location when hydraulic pressure is removed to a second inward location for two separate bends to achieve an acute angle bend. This improved slide lock prevents any possible injury to the operator by covering a stop arranged to prevent the slide from moving outward a greater distance then the first outward location.

Abstract: The powered pipe cutter and the pipe flaring tool both have a piston slidably mounted in a cylinder. The cylinder has a top end closed by a top end plug. A crimped cartridge bore in the top end plug communicates with a gas expansion chamber. A bolt and firing pin assembly are attached to the cylinder top end. The pipe cutter includes a shear housing with a pipe passage connected to the rod end of the cylinder. A shear plate is connected to the piston and moves with the piston to shear pipes. The pipe flaring tool includes a pipe clamp assembly with a pipe passage and a female flaring surface connected to the cylinder rod end. A male flaring surface on the piston cooperates with the female flaring surface to flare pipe ends.

Abstract: Forging machine for the cold forging of deformed steel bars includes upsetting and clamping dies housed in the same casing. The dies bear a continuous cavity so as to enable forging of long products.

Abstract: A process for producing a hollow monoblock shaft from a pipe, the pipe initially having a constant diameter and a constant wall thickness, and the monoblock component including at least one area of its length being of a smaller outside diameter and a greater wall thickness than the constant diameter and constant wall thickness of the pipe. The process can be carried out simply and economically by the following process steps: selecting a pipe with a wall thickness which corresponds to the smallest wall thickness of the finished component, partial heating of at least one area of the pipe, axial upsetting the heated area of the pipe and radial forging the heated area of the pipe.

Abstract: The present invention relates to a device for the deformation of workpieces, in particular for the plastic shaping of pipe ends, with a shaping unit actuated by the pressure of a fluid and with a prestressing unit arranged on a common longitudinal axis and actuated by the pressure of a fluid and also with clamping elements of conical design which can be clamped by means of the prestressing unit, in each case at least one separate pressure space being designed in the shaping unit and in the prestressing unit, which space can be pressurized independently of the pressure space of the other unit in each case. In this connection, the shaping unit and the prestressing unit are interconnected but completely closed off in relation to one another.

Abstract: A device for determining the quality of a part includes a sensor for detecting a strain on a selected portion of a part forming machine. A controller utilizes the detected amount of strain to make a determination regarding the quality of a corresponding part. In one example, the sensor detects a compressive or tensile strain on a machine frame when the sensor is aligned to detect a strain parallel to a direction of a force applied during the part formation process. The controller uses one or more characteristics of the sensor output and determines whether the detected amount of strain is within an acceptable range. In one example, monitoring the strain during the formation of a plurality of acceptable parts provides information for determining the acceptable range. The disclosed arrangements allow for making part quality determinations without requiring a sensor to be “in line” with the load.

Abstract: A method for expanding tubular blanks includes pre-expanding or initially expanding a section of the tube by forcing a punch into an open end of the tube. The punching process may be repeated to achieve up to approximately 50% expansion from the original configuration of the blank. Then, the same pre-expanded section can be further expanded by hydroforming such that the blank is filled with pressurized fluid to achieve further expansion of the initially expanded section up to approximately 100% expansion from the original configuration of the blank. As a final step, the open end of the expanded tube may be cut to its ultimate shape.

Abstract: A multipurpose horizontal press having a fixed workpiece-holder for a tubular workpiece to be drawn or tapered comprising a press body (1) surmounted by a worktable (2), having a superior surface (3) and an inferior surface (4), on the worktable (2) being positioned horizontally an operating hydraulic cylinder and, in correspondence with a through opening (70), a bridge (8) to which inferiorly a superior jaw (12) having its concavity facing downward, is rigidly connected. Opposite to the bridge (8) a support element (13) extends under the inferior surface (4) and supports a clamping hydraulic cylinder (14), having a rod (15) facing upward and provided with an inferior jaw (16), being sledge vertically inside the bridge (8) toward the superior jaw (12) and away from it.

Abstract: A tool for flanging coated brake pipes has a basic body with a receiving groove and a clamping jaw with a clamping groove. The receiving groove and the clamping groove form a clamping channel, in which the brake pipe can be received snugly. To achieve the snug hold of the brake pipe without unacceptable deformations as well as the coaxial alignment of this brake pipe in relation to a pressure piece of the basic body, by which the flanged head is formed, different surfaces of the receiving groove and of the clamping groove are provided. Thus, the surfaces may be provided with a surface roughness with an arithmetic average peak-to-valley height Ra of 5.0 to 10.0.

Abstract: A quick change tool cartridge for high production endform machines having a plurality of work stations mounted upon an indexable rotary head. The tool cartridge system is mounted upon the tool support by quick connect radially movable elements or pins radially displaced by a rotatable actuator sleeve. The locking elements cooperate with a groove, or holes, within the tool holder depending on whether or not relative rotation between the tool support and tool holder is desired.

Abstract: An apparatus for swaging an end of a tubular (22) is described as comprising a swaging head (17) for providing the swage to the end of the tubular (22). The swaging head (17) has two or more formations (22A, 22B) provided thereon to permit swaging of differing diameters of tubular ends. The apparatus may comprise a stop plate (5, 9) for abutment against the other end of a tubular (22) where the swaging head (17) and the stop plate (5, 9) are movably coupled to one another. The apparatus may have a clamping device (4) for clamping the tubular (22), where the clamping device is split into at least three part-circular clamping segments (30) which clamp around the outer circumference of the tubular to permit it to be swaged. The clamping device (4) may have a plurality of teeth (35) for gripping the outer surface of the tubular (22), and a plurality of grooves 36 formed between the teeth (35).

Abstract: A forming tool for pipe ends with a fixing device holding the pipe and a flanging die acting on the projection of the pipe end, where the flanging die has a mandrel which can be driven into the pipe end. A forming die surrounds the mandrel. The mandrel and the forming die are held in a housing. A limiting die surrounding the forming die being provided.

Abstract: A machine with a cutting device includes a stationary bar-cutter blade and a slicing blade which cooperates with and is displaceable in relation to the bar-cutter blade. The slicing blade is a closed circular blade. The bar-cutter blade is a half blade and cooperates with a centering and clamping piece, which is displaceable in relation to the bar-cutter blade, to form together a slotted round blade. The centering and clamping piece can be controllably displaced between a centering position, in which, during operation, the bar to be cut is centered without clamping of the bar; a released position, in which the centering and clamping piece is completely removed from the bar, and a clamping position, in which the centering and clamping piece clamps the bar.

Abstract: The invention relates to apparatus for enlarging part of a metal workpiece by cold forging, characterised by an enlarging die (5, 6) and by the die having means (8, 8′) to alleviate stress to the workpiece during forging.

Abstract: The invention relates to a device for forming an end area of a workpiece (2), especially for cold press-forming an end area of a pipe, comprising two force transmitting elements (7, 9) which are guided in a common housing (3). The device is characterised in that a first pressure chamber (26) is located between the two force transmission elements (7, 9) and in that a second pressure chamber (28) is allocated to the second force transmission element (9). When the first force transmission element (7) is in the bracing position, the second force transmission element (9) can be displaced in relation to the first force transmission element (7) in order to form the workpiece.

Abstract: A modular endforming mechanism for modifying an end of a thin-walled malleable tube is herein disclosed. The modular endformer comprises a gripping module having a collet means for grasping a tube inserted into the gripping module. The gripping module may be coupled to one of an expansion module and a reducing/flaring modular. The expansion module is constructed and arranged to actuate a sizing mandrel, which is inserted into the interior of the end of a tube to expand the diameter of the end of that tube. A forming insert works in conjunction with the sizing mandrel to limit the expansion of the tube diameter under the influence of the sizing mandrel.

Abstract: The invention relates to apparatus for enlarging part of a metal workpiece by cold forging, characterised by an enlarging die (5, 6) and by the die having means (8, 8′) to alleviate stress to the workpiece during forging.

Abstract: A pipe flaring die has a central opening with a profile configured to reduce stress concentrations at the base of the flared portion of the pipe. The profile includes an annular relief area intermediate an annular gripping surface and an annular beveled portion which defines the angle of the flared portion. The relief area provides a longer transition distance for the formation of the flared portion which results in a reduced residual stress concentration created at the base of the flared portion during the forming process.

Abstract: A handling apparatus for forging machines, especially for advancing a wire intended for the manufacture of screws, rivets and the like includes a first cam, keyed on a first motor-driven rotary shaft, cooperating with a first angularly orientable lever, associated with a roller and formed by a branch having a rectilinear portion, oriented parallel with respect to a screw, guided by a support and caused to rotate alternatively clockwise and counter-clockwise either by an electric motor or by hand; a sliding carriage, associated with the screw, provided with a transversal tying pin for an oscillating bar having on its free end a needle that strikes the rectilinear portion of the first lever; a second angularly orientable lever, cooperating with a carriage that is movable in a direction parallel to the direction of advance of the wire; wire grasping means for grasping the wire; a second cam, alternatively mounted on a second shaft or a rotary side shaft of the forging machine, which cooperates with a needle fixe

Abstract: An assembly for retaining a work piece and fitting together for placement in a swage machine. The assembly includes a die and a collar to keep the work piece from moving during the swaging process. The collar includes two clamping sections that are connected together, such as by a hinge. The collar is placed about the work piece and then clamped in place by a retaining bolt at the opposing end of the clamping sections. The die includes a recess for holding the collar and a recess for the tube. The assembly includes an anti-rotation feature to minimize rotation of the collar within the recess. One example of an anti-rotation feature is the formation of the recess and the collar in corresponding hexagonal shapes. The die may also include a recess for retaining a fitting to be swaged to the work piece. The die and collar assembly eliminates the need for nylon inserts and eliminates work piece rotation and axial movement during the automated swaging process.

Abstract: A process for cold forming the ends of metal tubes to reinforce same includes a die cavity into which the tube is placed. The die cavity includes a section with a recess having a greater diameter than the tube. The tube is placed such that a portion is left outside of the cavity and a mandrel is inserted into the tube. The mandrel includes a section that is adapted to bear against the portion of the tube outside of the cavity and to deform same. The deformation process results in the tube being folded upon itself within the recess in the cavity thereby forming a reinforcing flange at the end of the tube. The process is conducted without heating the tube.

Abstract: To produce a flanged pipe unit, a separate flange is put on a pipe and then the pipe is subjected to a punching to achieve an interlocked connection between the flange and the pipe. The flanged pipe unit produced by the method of the invention comprises a metal pipe including a larger expanded portion, a smaller expanded portion and a raised portion which are axially aligned so that the smaller expanded portion is placed between the larger expanded portion and the raised portion; and a metal flange having a through bore through which the pipe passes, the through bore including a larger diameter portion, a smaller diameter portion and a tapered end portion which are axially aligned so that the smaller diameter portion is placed between the larger diameter portion and the tapered end portion.

Abstract: When a flaring punch 2 is pressed into a pipe P from an end thereof to form a concentric or eccentric flared portion Pa, the taper angle &thgr; of the flaring punch is adjusted to apply axial compressive forces to the flared portion Pa thereby to maintain the wall thickness of the flared portion Pa at 70% or greater of the wall thickness of the blank pipe. If the flared portion is formed by a plurality of flaring punches 2A, 2B, 2C having different maximum diameters at a plurality stages, then regions where the elongation is maximum are not localized, preventing the wall thickness from being locally reduced. If an eccentric highly flared pipe where the center of the flared portion Pa and the center of the pipe P are displaced from each other is formed, then a seam-welded region s of the pipe P is aligned with the direction in which the amount &egr; of eccentricity is maximum, making the flared pipe resistant to being ruptured.

Abstract: An easy mode pipe-diameter reducing device provided for feeding a metallic pipe into the hole confined by the wall surfaces of a conical spring mounted in the die bodies of the device, wherein, wall sections of the die bodies with constant diameter guides the metallic. pipe, and wall sections of the die bodies with tapering shapes contract the wall of the metallic pipe. Thereby, the peripheral pipe wall is gradually contracted under confining of the tapering wall surfaces of the die bodies. Wherein, the pipe-diameter reducing device is comprised of an upper die body and a lower die body having a conical spring provided therebetween, the inner diameter of the conical spring forms the wall surfaces extending from the wall sections with constant diameter to the tapered wall sections thereof. Therefore, when the metallic pipe is fed till it contacts the tapered wall sections, it can be contracted thereby into the shape of a tapered pipe. Hence easiness of pipe reducing can be achieved.

Abstract: A method for forming a pipe includes providing a tubular workpiece having an upper portion and a lower portion; forming a tapered hole in the inner wall of the upper portion of the workpiece and forming an annular shoulder on the outer wall of the upper portion of the workpiece synchronously by cold forging operation; forming a plurality of teeth on the outer wall of the lower portion of the workpiece by a turning-machining operation, thereby forming the pipe which includes the tapered hole, the annular shoulder, and the teeth; and finally reinforcing the pipe by carburizing treatment.

Abstract: A multipurpose head forming and finishing apparatus includes a support frame (3) forming, on a horizontal plane, an arc holding a pair of arms (3a, 3b) symmetrical with respect to a median vertical plane. The frame (3) has a clamp (4), operated in a horizontal direction, for gripping a pipe (2) in proximity of a head (2a) to be worked. The clamp (4) includes a stationary jaw (5) and a mobile jaw (6), slidably supported on the arms (3a, 3b) of the support frame (3) by respective coupling guides and members, the jaws closable on the median symmetry plane. A tool (26) is operated in a direction axial with respect to the pipe (2) held by the clamp (4).

Abstract: An axially-extendable-bolt forming process by upsetting includes preparing a die having a through bore, and an internal upsetting cavity and a buffer space, a rod-shaped bolt precursor and a knock-out member, primarily pressing a leading end of the bolt precursor onto a leading end of the knock-out member, and secondarily pressing the bolt precursor onto the knock-out member. In the preparing step, the bolt precursor and knock-out member are fitted into the through bore of the die so that they can be brought into contact with each other. In the primarily-pressing step, the leading end of the bolt precursor is swollen finely and is brought into contact with an inner peripheral surface of the through bore of the die so that an excess material, being present adjacent to a leading-end surface of the bolt precursor, is flowed out into the buffer space.

Abstract: A portable tool for mechanically upsetting a steel reinforcement bar (e.g. rebar), one end of which is typically embedded in a concrete or similar structure, so that a relatively wide upset head can be formed at the protruding end to permit the bar to be reliably coupled to an opposing reinforcement bar. The protruding end of the reinforcement bar is first pre-heated and then inserted within the upsetting tool. A plurality of rotatable jaws are first moved towards and then rotated into clamping engagement against the reinforcement bar. A supply of hydraulic fluid is added to a cylinder of the tool for causing a hydraulic piston to be moved in a first direction through the cylinder to simultaneously compress a normally relaxed spring and drive an upsetting block towards and into engagement with the pre-heated end of the reinforcement bar so as to compress the pre-heated end between the jaws and the upsetting block in order to form the upset head.

Abstract: A manually operable hand tool apparatus for providing a radially outward flare, known as push connect flare, away from the distal end of a deformable tube. The hand tool comprises a gripper-die means for securing the tube, a yoke portion having internal threads and a manual hydraulic pump portion. The yoke moves axially on a threaded positioning screw that is rigidly connected to the manual hydraulic pump portion. A vise means comprising a screw and a tightening rod is attached to the yoke. The vise is used to secure the gripper-die means to the yoke. The pump portion comprises a cylindrical body, a flaring piston, a threaded positioning screw, a pumping linkage system and a relief valve. An adapter-die is secured by a guide nut which is connected to the flaring piston. Alternative adapter-die and guide nut designs are also used to connect the die to the flaring piston.

Abstract: The invention relates to thread formation and particularly to the formation of threads on deformed steel reinforcing rods. The method of forming a thread on the steel reinforcing rod comprises the steps of cold upsetting an end region (1) of a deformed steel reinforcing rod having a nominal diameter, the upsetting being arranged to increase the diameter of the end region to a new, upset, diameter greater than the nominal diameter, rolling a thread onto the end region (1) so as to produce a threaded region having a thread major diameter which is greater than the nominal diameter and a thread minor diameter which is less than the nominal diameter. The formation of such a thread enables the production of mechanical connections between pairs of rods, the connections having a strength greater than that of the rods being connected to one another.

Abstract: A method for making an internal upset (20A) on metal drill pipe (10) having a transition section (24A) with a curved inner periphery (28A) of a concave curvature extending continuously between the central portion (12) of the pipe (10) and the increased thickness end section (22A) and formed from a radius (R2). An external upset (20) is first formed in forging steps as shown in FIGS. 2 and 4 by radially expanding and squeezing the end of pipe (10). Then the final forging step radially contracts the external upset (20) to form the internal upset (20A) as shown in FIGS. 3 and 5. The finished internal upset 20A as shown in FIG. 7 has a transition section 24A with an inner peripheral curved surface 28A formed from a radius (R2). The forging steps are performed with a single heating of the metal drill time in a minimum of time preferably within around one (1) minute but in any event less than around two (2) minutes.

Abstract: A method and a portable tool for hydraulically upsetting a steel reinforcement bar (e.g. rebar), one end of which is typically embedded in a concrete or similar structure, so that a relatively wide upset head can be formed at the protruding end to permit the bar to be reliably coupled to an opposing reinforcement bar. The protruding end of the reinforcement bar is first pre-heated and then inserted within the upsetting tool to be clamped between a plurality of articulating jaws. A pair of hydraulic pistons are driven in a first direction through a respective pair of tandem cylinders to correspondingly drive an upsetting block towards and into engagement with the pre-heated end of the reinforcement bar so as to compress the pre-heated end between the jaws and the upsetting block to form the upset head.

Abstract: A method for making an internal upset (20A) on metal drill pipe (10) having a transition section (24A) with a curved inner periphery (28A) of a concave curvature extending continuously between the central portion (12) of the pipe (10) and the increased thickness end section (22A) and formed from a radius (R2). An external upset (20) is first formed in forging steps as shown in FIGS. 2 and 4 by radially expanding and squeezing the end of pipe (10). Then the final forging step radially contracts the external upset (20) to form the internal upset (20A) as shown in FIGS. 3 and 5. The finished internal upset 20A as shown in FIG. 7 has a transition section 24A with an inner peripheral curved surface 28A formed from a radius (R2). The forging steps are performed with a single heating of the metal drill time in a minimum of time preferably within around one (1) minute but in any event less than around two (2) minutes.

Abstract: The system increases the diameter to which pipe flanges can be flared. The tendency of the radial wall of the flange to crumple inwards is obviated by coining the transition corner of the wall. First, the pipe end is belled out to provide access for the coining punch. The belled-out end is then swaged back in, after the punch is removed. With the corner transition thus preconditioned, further axial pressure on the pipe with a suitable female punch causes the flange to expand diametrally in a controllable manner.