Abstract: An extrusion machine includes a main frame, a friction wheel, a tool holding device, a locking device and a tool unit supported on the tool holding device. Furthermore, a shielding unit with at least one first nozzle and at least one second nozzle is provided, wherein the nozzles are formed to emit a gas which is free of gaseous oxygen. The first nozzle is directed at a peripheral portion of the friction wheel. The second nozzle is arranged below a stripping area of the tool unit. Further, an extrusion machine has a sensor unit between the tool holding device and the tool unit and a method controls distance between two tool components of the extrusion machine. Furthermore, different extrusion machines as well as methods for changing friction wheels are provided.

Abstract: The present disclosure is directed to a tubular welding electrode with a sheath encapsulating a flux core, where the sheath comprises a number of added pores. The added pores may provide escape paths for the outgassing of moisture and hydrocarbons from the flux core when the tubular welding electrode is baked. In addition, the added pores may be used to hold a liquid, such as a lubricant. The added pores may be introduced using a process such as laser drilling or chemical etching, and may be added to a strip of sheath material prior to forming the strip into a tubular welding electrode.

Abstract: A method for setting conditions for a shaft diameter enlargement, a shaft diameter enlargement method, and a shaft diameter enlargement apparatus are provided. A controller of the shaft diameter enlargement apparatus controls a compressing section, a bending section, and a rotating section to enlarge an intermediate portion of a shaft workpiece to have a predetermined outer diameter by rotating the shaft workpiece about its axis with axial compressive force a bending angle being applied to the intermediate portion. The controller determines whether the shaft workpiece is acceptable, based on the number of rotations of die shaft workpiece required for enlarging the intermediate portion to have the predetermined outer diameter or based on an enlargement ratio of the intermediate portion.

Abstract: One or more hollow billets are loaded onto an elongate mandrel bar for extrusion. The billets are transported along the mandrel bar to a rotating die. The billets are transported through fluid clamps, which engage the mandrel bar and provide cooling fluid to the mandrel bar tip, and through mandrel grips, which engage the mandrel bar and prevent the mandrel bar from rotating. One or more press-rams advance the billets through a centering insert and into the rotating die. A quench assembly is provided at an extrusion end of the extrusion press to quench the extruded material. A programmable logic controller may be provided to control, at least in part, operations of the extrusion press system.

Abstract: One or more hollow billets are loaded onto an elongate mandrel bar for extrusion. The billets are transported along the mandrel bar to a rotating die. The billets are transported through fluid clamps, which engage the mandrel bar and provide cooling fluid to the mandrel bar tip, and through mandrel grips, which engage the mandrel bar and prevent the mandrel bar from rotating. One or more press-rams advance the billets through a centering insert and into the rotating die. A quench assembly is provided at an extrusion end of the extrusion press to quench the extruded material. A programmable logic controller may be provided to control, at least in part, operations of the extrusion press system.

Abstract: The present invention relates to a press for the direct extrusion of metallic material, wherein the press comprises a supporting structure which defines an extrusion axis and a transverse direction orthogonal to said extrusion axis. The press further comprises an extrusion die and a die-holder drawer, in which said die is placed. Moving means are provided for moving said drawer along a transverse direction between a first position (P1), in which said die is aligned with said extrusion axis, and a second position in which, when reached, said die can be replaced. The press according to the invention further comprises a fixed supporting element which supports the drawer at least when it occupies the first position.

Abstract: The invention relates to a tool unit (12) for an extrusion machine (1) with a scraping element (51), a tool element (49) with an expanding channel (50) receiving the scraped extrusion material (3) and a die (53). The tool unit (12) includes a receiving cage (42) with first and second receiving cage parts (43, 44). In the first receiving cage part (43) there is a tool element (49) inserted in a receiving channel (48). In the second receiving cage part (44) a receiving chamber (52) facing the first receiving cage part (43) is formed, in which at least the die (53) is received and supported by a support surface (56). In the tool element (49) as well as in the first receiving cage part (43) a common receiving groove (62) is formed with at least one groove base surface (63, 64), in which the scraping element (51) is inserted loosely and is supported. The invention also relates to an extrusion machine (1) as well as to a method for changing the friction wheel (4).

Abstract: A billet transport device inserts a billet emerging from a billet heater into a container of an extrusion press device, and includes a conveyor transporting a billet from a billet heater, an overhead type billet carrier directly transporting a billet from the conveyor to a billet loader, and a billet loader transporting a billet from the outside to inside of the extrusion press device. Further, the billet loader is comprised of an insertion roller device inserting a billet into a container and a billet insertion device placed at the front end of the billet loader.

Abstract: A die pre-heating system comprises at least one die oven, a robotic hoist and processing structure in communication with the hoist and the at least one die oven. The processing structure is configured to control the hoist to permit an extrusion die to be loaded into the at least one die oven and to be unloaded from the at least one die oven. The processing structure is also configured to cause the at least one die oven to operate according to a production formula for pre-heating an extrusion die loaded therein.

Abstract: A method of treating a metal billet to change its mechanical and/or physical properties by reducing grain size, the method involving feeding the billet through a first passage and into a second passage inclined to the first passage and deforming the billet by repeatedly loading and unloading it using a reciprocating die at a junction between the first and second passages.

Abstract: A forming apparatus for an extruded hollow section has a fixed die provided with a forming hole having guide grooves extending in a direction tilting against a direction of extrusion, and movable dies disposed to be able to travel along the guide grooves, respectively. The fixed die has a base part bridging between inner faces of the forming hole, and a hole forming part extended from an end of the base part, on a downstream side thereof, toward downstream inside the forming hole. The movable dies are disposed inside the forming hole with a gap remaining between the hole forming part and each of the movable dies.

Abstract: A method for forming the extruded hollow section using a forming apparatus including a fixed die provided with a forming hole having guide grooves extending in a direction tilting against the direction of extrusion, and movable dies able to travel along the guide grooves, respectively, wherein the fixed die has a base part provided so as to bridge between inner faces of the forming hole, and a hole forming part extended from an end of the base part, on a downstream side thereof, toward downstream inside the forming hole. The method includes the steps of extruding the parallel parts with the movable dies as-stopped state, and extruding the tilt parts while causing the movable dies to travel along the guide grooves, respectively.

Abstract: The present invention relates to a method and a device for manufacturing a blank for a round tool and to a blank for a round tool, and eventually to a method for manufacturing a round tool and to a round tool obtained. The device comprises a die for extrusion and a sleeve arrangement comprising a sleeve, and an end member for closing the sleeve in one end. Extrusion through the die continuously forms an extruded material comprising chip flutes and optionally internal coolant channels, which is received by the sleeve arrangement. The extruded material received by the sleeve arrangement is reworked and shaped to a shank portion after the interior shape of the sleeve arrangement. A projection of the end member protruding into the sleeve forms a bore in the blank. When the shank portion is finished the end member is released and moved forward as extrusion continues to form a fluted portion to complete the blank.

Abstract: A stem slide apparatus comprises a stem slide base (73) with a stem (6) horizontally mounted thereon to press a billet (B) mounted on a container (5), a slide guide member (72, 72a, 72b) mounted on a vertical stem move support member (71) and formed with guide grooves in which the side end portions of the stem slide base are fitted and vertically slid, and a lock means (77a, 77b) arranged on the slide guide member to press the side end portions of the stem slide base. The stem slide apparatus further comprises a drive mechanism (10) having an electric motor (11) to move the slide base in the sliding direction. Therefore the indirect cause of a fire is removed and the maintenance work simplified.

Abstract: The stem slide device of the present invention in an extruder has a stem vertical movement support (71) and slide guide members (72-1, 2) fastened to the support and forming guide grooves. A stem (6) pushing against a billet loaded in a container is held at the slide table (73) horizontally. The slide table slides in the vertical direction along the vertical face of the support. When the slide table is positioned at the bottom end of the guide groove, the hydraulic cylinders (77-1, 2) are driven so that the rods (78-1, 2) push the back surface of the slide table against the vertical face of the support. Therefore, the axis of the stem is held matched with the axis of the container.

Abstract: The invention relates to a method for adjusting the position of a mandrel (10), which is situated in a hydraulic punch consisting of a cylinder and a ram that form a mandrel cylinder (8), in an extrusion press for producing pipes (2), which are extruded from blocks (4) that are loaded into a receiving device (5) situated upstream of the extrusion press (3) and are punched using the mandrel (10). The invention is characterised in that the mandrel cylinder (8) is driven directly by pumps (11), which are set for a pre-calculated throughput that is dependent on the press speed, and that an additional throughput is added to the pre-calculated pump throughput. To adjust the position of the mandrel (10), a control valve (16) that acts on the ring side (12) of the mandrel (8) is connected to a tank (17).

Abstract: An apparatus for horizontally actuating hemming and stamping die sets includes a horizontal base support and a roller device horizontally mounted thereon. A linear guidance system is set in and a drive support is vertically attached to the base support. A drive mechanism is supported and an anvil die set is held by the drive support. A vertical platen rests on top of the base support and is loosely guided by the linear guidance system. A punch die set is held by the vertical platen and a plurality of bushings are set therein. At least three guide shafts are secured to the anvil die set and each is engaged to one of the bushings of the punch die set. A plurality of link bars are attached to the vertical platen via link bar attachments and coupled to the drive mechanism. Actuation of the drive mechanism horizontally moves the vertical platen.

Abstract: A shear-extrusion method of severe plastic deformation for fabrication of metal shapes with ultra-fine structures is described. The improvements of the method include unidirectional shear of any required intensity during one step processing and under high hydrostatic pressures, fabrication of long products with different cross-sections, refinement of low ductile alloys, the increase of productivity and cost reduction. The method can be realized as forward extrusion, backward extrusion, semi continuous extrusion and extrusion of hollow shapes in portal dies with a welding chamber.

Abstract: A continuous extrusion machine has a chassis (1) supporting a wheel (2) for rotation by a motor. An endless groove (7) extends around the periphery of the wheel (2). A shoe (3) is mounted in the chassis (1) and has an enveloping surface shaped to closely envelop an arc of the wheel (2) periphery so that the groove (7) co-operates with the shoe (3) to form a passage. An abutment is mounted on the shoe (3) to extend into the passage at a downstream end. Tooling is mounted in the shoe (3) including a die such that a material such as aluminum or copper bar fed into the groove (7) is extruded through the die as a consequence of the energy transfer via friction from the rotating wheel (2). A gap (12) exists between the enveloping surface and the wheel (2). The gap (12) is used to provide the orifice of a sonic gap (12) sensor whereby the size of the gap (12) can be accurately and directly measured.

Abstract: The invention concerns a device and a method for continuous pressing of a plastically deformable blank into a three-dimensional section with a predetermined cross-sectional area, comprising a substantially cylindrical, fixed die, an opening formed in the die, through which the plastic blank is intended to be pressed, and at least one rotary die arranged adjacent to the opening, the rotary die having one or more recesses in its peripheral surface for forming the blank, during the rotation of the die, into at three-dimensional section with transverse sectional parts. According to the invention, the rotary die has a varying pitch radius as measured from the axis (C), which allows pressing of sections with varying cross section.

Abstract: A heat dissipation system and method for extracting heat from an integrated circuit device includes a thermally conductive base having substantially planar upper and lower surfaces, the upper surface is disposed across from the lower surface, and the lower surface is adapted to contact an integrated circuit device. A conductive heat exchange portion including an array of fins extends angularly away from the upper surface of the base. The array has a chamber within to house an air movement device so that the air introduced by the air movement device creates a swirling air movement over the heat exchange portion to increase air movement around the heat exchange portion to enhance the heat extraction from the heat exchange portion.

Abstract: A work method for loading an extrusion billet using a billet loader into the billet chamber of a metal extrusion press and a metal extrusion press for extruding sections through a die using an extrusion ram. Whereby the loading can be carried out regardless of the position of the billet chamber and the movement upon the removal of the extrusion residue. The metal extrusion press has a billet loading device coupled to the billet chamber and movable jointly with it in and opposite to the extrusion direction. The extrusion ram can be positioned spaced from the billet chamber by at least the length of an extrusion billet.

Abstract: An apparatus for the extrusion of profiles includes at least two rectilinear transport path for receiving extruded profiles and provided with clamping devices for clasping the leading and trailing ends respectively of respective extruded profiles. The two transport paths are carried by a drum-like rotatable support whereby each transport path can be moved from an extrusion position whereat an extruded profile can be received on the transport path, and a transfer position whereat the profile can be transferred from the transport path to another processing station, and further to the extrusion position.

Abstract: A billet fed extrusion press comprises a rotating arm (46) on a movable cross member (28). The arm carries a plunger (48) and a billet loader (50) spaced from each other, and can be rotated between a condition in which it brings the plunger into a working position in alignment on extrusion axis (a) of the press and the loader (50) into a billet receiving position on one side of the press, and a condition in which it brings the loader into a billet loading position along the axis (a) of the press and the pusher into a rest position on the said one side of the press.

Abstract: A horizontal metal extrusion press has a tool cassette (13) for a tool set composed of a die (134), a die holder (32) and at least one pressure ring (36), displaceable horizontally along guide rails (10,11) transversely to the press axis between an extrusion position (P) on the press axis and a changing position (W) spaced horizontally from the press axis, and replaceable by a second cassette in the changing position. The cassette has an upwardly open U shape to receive the tool set. A locking piece (14) for retaining the tool set can move in a vertical guideway (22) in the upper guide rail (10), to an upper position above the opening of the cassette and to a lower position inside the opening for closing the opening. The cassette opening has an internal bead (29), and the die holder has a corresponding annular groove. The locking piece is guided on the beads along the sides of the cassette opening.

Abstract: A method for feeding billets in horizontal extruding presses which comprises the opening of the container, the cutting off of the surplus of the billet extruded simultaneously to the supplying of a new billet in line with the container and to a simultaneous withdrawal of the press shank after each extruding operation and with the withdrawl of the main piston; then the advancing of the pusher for the insertion of a new billet into the container which is still open and the simultaneous withdrawal of the billet shear and of the feeder means for the supplying of the billet; the closing of the container when the pusher retracts and the movement of the press shank on the axis of the container; finally the advancing of the main piston for the inserting of the press shank into the container for the extrusion operation.

Abstract: An apparatus for extruding stepped extrusions, e.g. of aluminum or aluminium alloy, comprises a die holder carrying a major die, and a split minor die arranged for abutment with the downstream side of the major die and having its two halves mounted on respective parts of a split holder. The holder parts are movable towards and away from the line of extrusion to put together and separate the halves of the minor die. The die holder and the container of an extruder are movable towards each other to press the minor die the major die and the downstream face of the container into sealing engagement about the die apertures, and are movable away from each other to permit the extrusion to be sheared off between the container and the major die.

Abstract: The present invention relates to an apparatus for producing three-dimensional curvilinear tubes. The apparatus comprises (a) a tube producing die having an axi-symmetric inner surface for passing tube material therethrough; (b) a core member having an axi-symmetrical outer surface and disposed in the die in a spaced relation to the inner surface of the die so that the tube producing material passes between a gap defined by the inner surface of the die and the outer surface of the core member; and (c) positioning devices for positioning the die in offset relation to the core member in a plane perpendicular to an axis of the die.

Abstract: A structure comprised of a plurality of material cylinders, a ram head or heads for extrusion, and a mechanism for transferring the material cylinders into alignment with a ram head. The plural cylinders allow an operator to manually load one cylinder of a pair with extrusion material in preparation for an extrusion phase on that cylinder, while the other cylinder of the pair is being discharged by a suitable ram piston in the extrusion phase. A special de-airing mechanism is provided and a lateral shift system to align the respective cylinder selectively with a power extrusion ram. More than one pair of cylinders can be utilized.

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

Abstract: Metal billets trapped in the billet container of an indirect extrusion press are removed by indirect extrusion in the reverse direction until the billet size is reduced sufficiently for the residue to be expelled bodily from the container. The stem used to support the container-closing plug constitutes, or is replaced by a stem for effecting the reverse indirect extrusion.

Abstract: The present invention provides a method and apparatus for a forwardly extruding superalloy parts. The method provides for extruding metal parts from a superalloy material in an extrusion press having a lower press table assembly accommodating the extruded part; and extrusion pot and an extrusion die located on the lower press table assembly; and an upper plunger reciprocally movable with respect to the lower press table having an extrusion punch mounted thereon.

Abstract: An indirect extrusion press and method of operating the press. The press includes a container with opposite axial ends and an axial cavity for receiving a billet. The container is mounted for aligning the axial cavity with the extrusion axis. A bolster is disposed adjacent one axial end of the container for blocking movement of a billet out of the cavity when a force is applied against the billet from the other axial end of the container. A ram is mounted on the side of the container adjacent the other axial end of the container for movement in the axial direction of the container. The ram has an axial passage therethrough aligned with the extrusion axis. A rotatable turret is mounted on the ram, and a hollow pressing stem is mounted on the turret. The turret is rotatable for placing the hollow pressing stem in a first position aligned with the extrusion axis, and in a second position off of the extrusion axis.

Abstract: An indirect extrusion process, and apparatus therefor, for producing an extrusion product from a hot metal billet. A press container is mounted to be substantially axially stationary during extrusion of a billet. A hot billet, a die and a pressure disc are located into the axial throughbore of the container so that the billet is sandwiched between the die and pressure disc, with the pressure disc having a maximum outer diameter between opposite radial faces which is slightly less than the diameter of the axial throughbore to define a diametrical clearance between the pressure disc and the press container. A bolster is located adjacent the pressure disc and is axially fixed to substantially prevent axial movement of the pressure disc in a direction toward the bolster during extrusion. The bolster exerts a relatively insigificant axial force against the container.

Abstract: For recycling the dies and pressure plates, in an extrusion press designed to perform both direct and indirect extrusion, a common conveyor extends beside the press between a device for stripping extrusion residue from the dies, and a device for separating extrusion residue from pressure plates. A first transfer arm is provided to transfer a pressure plate and direct extrusion residue from the press axis to the conveying means for conveyance to the pressure plate-separating device. The same transfer arm serves to transfer stripped dies from the conveying means to the press axis. A second transfer arm removes the die, pressure plate and extrusion residue after indirect extrusion, to the conveying means, which conveys the die to the die stripper, and the pressure plate and extrusion residue to the device for separating the extrusion residue from the pressure plate. Separated pressure plates are recycled to a magazine and then to the press axis for re-use.

Abstract: An indirect extrusion press has a die and die holder 20 and a sealing plate to close the billet carrier. After extrusion, a one-piece or two-part holding sleeve is placed between the sealing plate and the sealing stem and the latter is advanced to push the billet carrier over the die stem thereby expelling the sealing plate, the butt end of the billet, and the die holder into the sleeve. A shearing device then shears off the sealing plate and butt end, the second part of the holding sleeve moving aside with the sealing plate and butt end in it. The die holder is clamped in the holding sleeve which is pulled away from the billet carrier to separate the die from the extruded product. In the case of a one-piece holding sleeve, a transverse aperture is provided to allow the shearing operation.

Abstract: An indirect extrusion press including a die assembly having a loose die detachably mounted on a die stem and axially movable relative to a billet container for extruding a billet through a die hole, and a die handling mechanism for transferring the die assembly between the press center and a position outside the press machine, the indirect extrusion press including a reduced diameter portion provided in the rear end portion of the die stem and defining a stepped wall portion; a loose die detachably mounted on the end face of the reduced diameter portion; and a detachable cleaning ring loosely fitted on the reduced diameter portion of the die stem in abutting engagement with the stepped wall portion and in axially spaced relation with the loose die, the cleaning ring being in sliding engagement with the inner periphery of the billet container in the extruding phase of the press operation to remove container shells.

Abstract: An extrusion press having a die slide assembly capable of shearing the extrusion in the die, and transporting the die to a side movable transfer table for change thereof, the assembly eliminating excessive projection beyond the confines of the extrusion press of die transport equipment. The die slide assembly includes a first hydraulic cylinder for shearing an extrusion from the die, and a second hydraulic cylinder mounted adjacent the first cylinder for transporting the die and die holder to a transfer station on the side of said platen, permitting an exchange of the die holder die therewith, when necessary. The second hydraulic cylinder is movable with the die slide assembly to minimize the length requirements of the second hydraulic unit and still effectuate full traverse of the die holder.

Abstract: In an indirect extrusion press provided with a gate lock and a rearwardly extending indirect-extrusion stem, the stem normally extends through a die slide with the rear end of the stem engaged by a loose die disposed in the front end of a billet container behind the stem. After a ram has extruded a billet through the die and the gate lock has been released, the stem is moved forward clear of the die slide as the die is pushed into the slide, which is then moved transversely of the extrusion stem and out to the side of the gate lock housing for cleaning or replacement of the die.

Abstract: In an indirect extrusion press of the type wherein a die stem is connected to a press axis on the rear end surface of a press platen and extends towards a container, an intermediate frame type indirect extrusion press including an intermediate frame movably interposed between the press platen and the container in the direction of the press axis, encompassing the die stem and equipped with a guide section in its longitudinal direction, a driving device for moving the intermediate frame in the direction of the press axis and a guide mechanism placed between the intermediate frame and press structures such as a press bed, a column and the like and guiding the intermediate frame in the direction parallel to the direction of the press axis.

Abstract: A die stem and a billet-receiving sleeve extend rearwardly from an extrusion apparatus platen slide that is movable laterally from a first position in which the stem is aligned with a billet container passage behind it to a second position in which the sleeve is aligned with the passage. An extrusion stem behind the container is movable forward through the passage, and there is means behind the sleeve in the first position for pushing a hot billet into the sleeve. A die slide carried by the container and holding a die is movable laterally across the container from an inner position aligned with the container passage when the platen slide is in its first position to an outer position aligned with the die stem in the second position of the platen slide. In the sleeve there is means for pushing a billet out of the sleeve in the second position of the platen slide and into the container as the container is moved forward toward the sleeve.

Abstract: A press operated by the reverse method comprising a fixed tubular die casing defining a pressing axis, a main jack operative to displace a cross beam supported for displacement along the pressing axis, a displaceable holder disposed between the cross beam and the tubular die casing and having a bore disposed along the pressing axis for receiving a billet to be pressed. The bore has open ends and the holder is capable of fitting over the die casing by axial displacement thereof. A closure member is carried by a slide for closing one end of the bore in the holder; the slide is displaceable on the cross beam transversely with respect to the pressing axis. A support is slidably mounted parallel to the slide and is carried by an auxiliary cross beam which is slidably mounted on the main cross beam for movement parallel to the pressing axis. The support and the slide are simultaneously displaceable under the action of a jack or other suitable device.

Abstract: Two elongated gripping members (12,12) cooperate to form a closed pressure chamber about a waxed billet (61). The gripping members are reciprocated relative to an extrusion station (13), such reciprocation first moving the pressure chamber toward and past the extrusion station so as to extrude the billet through a die (66) at the extrusion station, and then returning the gripping members, in separated condition, to their initial positions to permit the immediate loading of another billet between the gripping members. Also disclosed are various additional systems, e.g.

Abstract: An arrangement for obtaining proper alignment of parts and proper sealing of parts in an extrusion press having an offset supporting shaft rotatably carrying a container holder assembly and two or more containers into which heated billets are placed to be brought to the extrusion station. A set of aligning keys diametrically opposite each other on both ends of each container engage with a corresponding set of keyways in a sealing member and a die slide respectively.

Abstract: An extrusion die mounted in a die holder is fitted onto the end of the press stem of an extrusion press by apparatus which has a swing arm which receives a die holder in a first position, then pivots to a second position where the die holder is aligned with the extrusion press stem, rotates the die holder so that it is correctly oriented relative to the press stem and then pushes the die holder axially onto the press stem.

Abstract: A process and device allows long as-cast billets to be extruded, with the help of a container which is divided into at least two segments which can be opened and closed radially with respect to the main axis. In the closed position, the segments grip the part of the billet inside the container and, as a result of a relative movement between a die mounted on a hollow stem, the said die is forced into a length of the billet inside the container as a result of which at least one section is extruded. On opening the segments, the billet is advanced to fill the container again whereupon the segments close, clamping onto the billet, and the extrusion sequence is repeated.

Abstract: This disclosure pertains to a method and device for changing a die ring to and from a die in an indirect extrusion press. Once the die-die ring assembly is exposed from the container of the press, the changing device consisting of a rotating arm having opposed relatively movable jaws is caused to engage the die ring and remove it from the extrusion axis of the press, and after treatment, if necessary, to return it to the extrusion axis and place it on the die.In the operation of indirect extrusion presses it has been the normal practice to employ a composite die assembly consisting of a die and outer encircling die ring. After completion of the extrusion operation the die ring is removed from the back of the container and either the same die ring or a second one is placed back on the die after the die or the container has been moved to position the die at the front of the container.

Abstract: In a device for extruding hollow articles, e.g. tubes, the die is rotatably mounted in the die holder. The die has a hole for shaping the external surface of the tube. The axis of said hole is eccentric relative to the axis of the external surface of the die holder. The device comprises a needle for shaping the internal surface of the tube, the needle entering the die hole during the process of extrusion. The needle axis coincides with the extrusion axis. The die holder is made of at least two bushings, installed one inside the other. The axes of the internal surfaces of the bushings are offset relative to the axes of their external surfaces. The bushings are capable of turning for adjusting the position of the die hole axis relative to the needle. This design of the die holder makes it possible to minimize the eccentricity of the axes of the internal and external surfaces of the tubes extruded in the device realized according to the present invention and installed in a conventional press.

Abstract: Aluminum or aluminum alloy scraps or wastes are broken into chips and extruded under a high temperature to produce extruded structural profiles. The method is characterized by the fact that the interior of the extruder is evacuated prior to or simultaneously with the extrusion step so as to exhaust air entrapped in the body of the chips. There is also disclosed apparatus suitable for performing the method.

Abstract: A hydrostatic extrusion process and an apparatus therefor includes a mandrel and a stem which are movable independently of each other, and a seal block which is utilized for increasing the pressure of the pressure medium for performance of the extrusion operation of the billet. A supply device pre-disposes an extrusion die, a billet, pressure medium, and a seal block within a supply unit or sleeve and is capable of being moved from a position exterior of the extrusion apparatus station to a position corresponding to the extrusion station, and in this manner, the time period required for completing extrusion cycles is substantially reduced. Still further, a locking mechanism, including a locking slide and a locking plate, are operatively associated with the mandrel for controlling or limiting the axial movement of the mandrel so as to in turn control the loading and tensioning of the same in order to prevent damage thereto.