US3449935A - Apparatus and method of metal extrusion - Google Patents

Apparatus and method of metal extrusion Download PDF

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Publication number
US3449935A
US3449935A US579901A US3449935DA US3449935A US 3449935 A US3449935 A US 3449935A US 579901 A US579901 A US 579901A US 3449935D A US3449935D A US 3449935DA US 3449935 A US3449935 A US 3449935A
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Prior art keywords
pressure
billet
extrusion
ram
die
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Expired - Lifetime
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US579901A
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English (en)
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John Dewar Mcallan
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National Research Development Corp UK
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National Research Development Corp UK
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Priority claimed from GB39796/65A external-priority patent/GB1155599A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/007—Hydrostatic extrusion
    • B21C23/008—Continuous extrusion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
    • Y10T29/5152—Plural diverse manufacturing apparatus including means for metal shaping or assembling with turret mechanism
    • Y10T29/5154—Plural diverse manufacturing apparatus including means for metal shaping or assembling with turret mechanism tool turret
    • Y10T29/5155—Rotary tool holder

Definitions

  • the apparatus includes a tubular ram arranged to receive the billet with a small clearance, a die disposed in an extrusion chamber, means for applying radial pressure to the ram to cause it to grip the billet, a jack operatively connected to the ram, means for applying axial pressure to the jack to cause it to advance the ram and billet to promote extrusion of the billets through the die, means for applying fluid pressure to the extrusion chamber of a value suflicient at least to prevent outward plastic flow of the billet between the ram and the entrance to the die under the axial stress produced by the ram, means for applying axial pressure to the jack in the reverse direction at a time when radial pressure is no longer applied to the ram whereby the ram moves backwards over the billet and means for holding the billet stationary during the backward movement of the ram.
  • a storage chamber may also be provided into which the extruded metal issues, and a die may be located at the opposite end of the storage chamber and means may be provided for applying fluid pressure to the storage chamber whereby a second stage of extrusion takes place therefrom which may be intermittent or continuous.
  • the present invention relates to the extrusion of metals and more particularly to apparatus and a method by means of which a metal billet of unrestricted length can be extruded either intermittently or continuously.
  • the billet is surrounded by a high pressure liquid so that it extrudes through a die due to hydrostatic pressure.
  • Each operation necessitates preparing the billet by cutting it to an appropriate length, chamfering one end in readiness for the inlet of the die and sealing the billet into a container, all of which, even with a breech mechanism in the latter instance, is timeconsuming, and precludes a product of unrestricted length.
  • the chief object of the invention is to avoid these repeated setting-up steps, also to achieve higher net extrusion ratios than are presently possible hydrostatically and to produce a continuous product such as wire.
  • apparatus for extruding a metal billet of unrestricted length comprises a tubular ram arranged to receive the billet with a small clearance, a die disposed in an extrusion chamber, means for applying radial pressure to the ram to cause it to grip the billet, a jack operatively connected to the ram, means for applying axial pressure to the jack to cause it to advance the ram and billet to promote extrusion of the billet through the die, means for applying fluid pressure to the extrusion chamber of a value suflicient at least to prevent outward plastic flow of the billet between the ram and the entrance to the die under the axial stress produced by the ram, means for applying axial pressure to the jack in the reverse direction at a time when radial pressure is no longer applied to the ram whereby the ram moves backwards over the billet and means for holding the billet stationary during the backward movement of the ram.
  • a storage chamber into which the extruded metal issue, a die at the opposite end of the storage chamber and means for applying fluid pressure to the storage chamber whereby a second stage of extrusion takes place therefrom, which may be intermittent or continuous.
  • the exit from the die at the entrance to the storage chamber is preferably provided with a tubular projection of substantially the same internal diameter as the ex truded product, this projection contracting on the product and clamping it firmly if the pressure in the storage chamber exceeds that on the other side of the said die, thus isolating the storage chamber so that, for example, the second stage of extrusion may take place whilst the first stage ram is being retracted.
  • the invention also relates to a method of extruding a metal billet of unrestricted length comprising the steps of feeding the billet into a tubular ram of slightly greater diameter than the diameter of the billet, applying radial fluid pressure to the tubular ram to cause it to contract to grip the billet, advancing the ram and hence the billet to produce extrusion through a die, removing the radial pressure to disengagethe billet from the ram and retracting the ram while holding the billet stationary.
  • the billet between the tubular ram and the die is subjected to a fluid pressure of a value at least sufiicient to prevent outward plastic flow of the billet under the axial stress produced by the ram. Before this pressure can be applied the nose of the billet must be pressed into the entry orifice of the die so as to prevent the escape of the pressurised fluid through the die.
  • FIG- URES l6 Various embodiments of the invention will now be described in detail, by way of example only, with reference to the accompanying drawings comprising FIG- URES l6.
  • FIGURE 1 is a side elevation, partly in section, of metal extruding apparatus according to the invention.
  • FIGURE 2 is a perspective view of a core bar with part of a tubular ram and the billet extending therethrough;
  • FIGURE 3 illustrates diagrammatically the addition of a second stage of extrusion
  • FIGURE 4 is an enlarged view of a die assembly having a tubular projection assumed to extend into a storage chamber as shown in FIGURE 3;
  • FIGURE 5 is a view similar to that of FIGURE 4 illustrating a coiler mechanism applied to the die assembly of FIGURE 4;
  • FIGURE 6 is a modified arrangement on the lines of FIGURE 1 but with a movable second die whereby the necessary high pressures are generated within the equipment and only a low pressure external source is required.
  • a tubular ram 11! 1s fixedly attached through a flange 13 to a jack 11.
  • a circular section billet 12 of unrestricted length is fed into the tubular part of the ram.
  • Billets measuring in diameter and 12' in length have been used successfully during experiments. Lengths may generally be attached to one another successively if any given length is not suflicrently long for the job in hand, or the extrusiommachme may be fed from a plant continuously producing billet material.
  • a gripper chamber 14 Surrounding a portion of the tubular ram is a gripper chamber 14 adapted to receive fluid under pressure to provide the required grip by the ram on the billet by contracting the tubular part thereof on the billet prior to the extrusion of the foremost part thereof through die Disposed within the gripper chamber is a supporting member 17, referred to as a core bar, and shown in greater detail in FIGURE 2.
  • This member which is fixed in the assembly, serves to guide and support the ram against any tendency to buckle when driven forward to extrue the billet.
  • the core bar extends over a substantial part of the length of the ram and, because of longitudinal slots 18 disposed therein and extending formost of the length of the bar, a small quantity of pressurised flurd, conveniently oil, reaches the surface of the ram to cause it to contract and also facilitates its movement through the core bar.
  • the core bar is in equilibrium, being surrounded by the high pressure fluid and thus has no tendency to contract thereon when pressure is applied in the gripper chamber.
  • the core bar is slightly relieved 1n the region of the slots so that fluid in the gripper chamber can flow around it and thus enter the slots and proceed to the surface of the ram.
  • the disposition of the core bar in this chamber reduces the volume to a few cubic inches, which when occupied by high pressure fluid, is sufl'lcient to maintain the ram in gripping contact with the billet in spite of the axial force required to promote extrusion through the die 15.
  • the shrink fit then occurring between the ram and the billet, possibly assisted by a seal (such as seal 8 in the embodiment illustrated in FIGURE 3 which is to be later described), prevents fluid from escaping from a chamber 16 which is described below.
  • a pressure chamber 33 defined by the outer casing 41 of the apparatus and the end of the jack 11 has a duct 34 leading thereto through which fluid under pressure from a fluid pressure supply reservoir (not shown) provides the force required to advance the jack and attached ram axially towards the die.
  • Fluid seals 37 are provided to prevent leakage between the jack and the outer casing 41.
  • This outer casing also defines with the jack a fluid pressure chamber 35 on the opposite side of the jack head through which pressure fluid is applied by way of a duct 36 to withdraw the ram during the retracting phase of each cycle of operation.
  • a head 42 is attached to the casing 41 by screws one of which is shown at 43.
  • the head 42 is assumed to be secured by the ring 44 to the container 45 embodying both the gripping chamber 14 and the extrusion chamber 16 which is immediately in front of the die 15. Fluid under pressure is introduced into this chamber through a duct 20 which is preferably connected to a pressure intensifier (not shown) adapted to deliver a constant high pressure during the forward stroke of the ram.
  • a back stop 38 is provided.
  • This stop conveniently consists of a collet chuck with gripping jaws of the type usually used as a lathe attachment and is operated through a lever 39 from cylinder 40 controlled by fluid pressure.
  • the assembly is held together by two end plates, that 4 at the rear being shown at 46. These plates are connected by four parallel bolts such as 47 extending be tween corresponding corners, the bolts being provided with nuts such as 48.
  • the plates are bored centrally, the front one to admit the billet to be extruded and the back one to permit the product of the extrusion to issue forth from the apparatus.
  • a billet 12 is inserted into the apparatus from left to right and passes through the back stop 38, the jack 11 and the tubular ram 10, coming to rest against die 15.
  • Fluid under pressure is introduced through duct 19 to the gripper chamber 14 causing the ram to contact on the billet.
  • Fluid pressure is applied to the chamber 33 to advance the jack 11 and move the ram and hence the billet tightly against the die 15 to seal the extrusion chamber 16.
  • High pressure fluid is now introduced into the extrusion chamber 16 through the duct 20, the jack 11 is advanced and extrusion takes place.
  • the hydrostatic pressure in the extrusion chamber must be at least suflicient to prevent outward plastic flow of the billet between the end of ram 10 and the entrance to die 15 but is preferably sufiicient to promote hydrostatic extrusion. As shown in FIGURE 1, the extruded metal emerges from the die at 25.
  • the pressure in the extrusion chamber 16 must be released, this being followed by the release of the pressure in gripper chamber 14 to relax the grip of the ram on the billet.
  • the back stop is now operated to grip the billet and maintain it steady d ring the back stroke of the ram.
  • the ram is then caused to slide back over the billet by the application of fluid pressure through duct 36 to act on the jack 11. It will be noted that the area on which this pressure operates is very much smaller than for the forward stroke since a much smaller force is needed.
  • the high pressure fluid in the extrusion chamber 16 must subject the billet t0 inward stresses exceeding the yield stress of the billet material and the axial stress on the billet should at least equal the radial stress produced by the high pressure fluid. Nevertheless if a greater extrusion ratio is desired, satisfactory extrusion of the billet through the die can take place with the axial stress greater than the radial stress so long as the difference does not exceed the yield stres of the material.
  • the gripping pressure should not exceed the elastic limit of the material so that the surface of the portion of the billet not extruded remains unmarked. Holding the material without spoiling its surface is considered desirable by many manufacturers. This etfect is obtained by using gripping pressures such as to not permit the gripping force to exceed the elastic limit of the billet material.
  • This apparatus comprises a generally cylindrical storage chamber 21 in which the product 25 is collected and a projection member 22 for directing the product into the chamber.
  • This member shown in detail in FIGURE 4, comprises a die 23 having a tubular projection 24 extending into an ante-chamber 26. This tubular projection may be integral with the die or attached thereto.
  • the storage chamber 21 may be at atmospheric pressure or at some back pressure during extrusion through the die 15. On raising the pressure in storage chamber 21 the tubular projection 24 will grip the product 25 from the die 23 thus avoiding any tendency for backward movement and extrusion will take place through die 31.
  • FIGURE 5 When the product 25 issues into the chamber 21, it tends to form a coil therein as shown in somewhat idealised form in FIGURE 3, so that an appreciable amount of the first extrusion product may be stored.
  • the arrangement of FIGURE 5 may be employed. This incorporates in the ante-chamber 26 a coiler mechanism comprising a reel member 27 rotatable on needle roller bearing 28 and co-operating with an anti-friction thrust ring 29.
  • the member 27 has an extension 30 provided with a bore extending from the centre of the member 29 of the same diameter as the tubular projection 24 and disposed at a slight angle to the axis of the chamber 21, This arrangement provides that the product 25, on leaving the tubular projection 24, is directed by the reel 27 into the chamber 21 at an angle to the axis of the chamber and additionally with a component of direction tangential to chamber 21 and will therefore coil therein more readily. As the product coil in the chamber 21, it rotates the reel 27.
  • the coiled metal extrudes through this die.
  • the second extrusion product may be wound on to a spool, or if a finer gauge product is required, the wire is directed through a further storage chamber and die or series of chambers and dies.
  • the pressures in the chambers may be adjusted in such a manner that simultaneous extrusion can be obtained from alternate chambers, all the chambers being provided with tubular projection members and preferably also with coiler-mechanism. Difficulty will arise if conditions are such as to result in underor over-filling of a cylindrical chamber. In the first instance the product will become straight within the chamber so that necking occurs and probably resultant breakage. This can be avoided by suitably limiting the pressure in that chamber. Over-filling is less likely to occur since when the receiving cylindrical chamber approaches the full condition, the hydrostatic pressure attains such a value in relation to that in the previous extrusion chamber that extrusion ceases. It is desirable, however, to time the application of pressure to the extrusion chambers to avoid billet breakage or overfilling of the chamber into which extrusion is taking place.
  • FIGURE 1 The arrangement described in FIGURE 1 depends for its operation on the supply of high pressure fluid from an external source, and this is fed into a central bore at different places, particularly to the extrusion chamber and the gripping chamber.
  • the ducts whereby this is done constitute a source of weakness in the main frame and it is therefore preferable for this to be eliminated and for the whole device to be operated from a comparatively low external pressure, the required high pressure being generated therefrom in the device itself.
  • FIGURE 6 A modified construction which enables this to be done is shown in FIGURE 6 which indicates in line diagram form the relationship of the various parts.
  • the main body 51 within which extrusion takes place is very heavily constructed to resist the high pressures concerned and it is provided at one end with a cylinder 52 of much lighter construction and a similar cylinder 53 at the other end.
  • Working within the cylinder 52 are two pistons 54 and 55, 54 carrying the tubular ram 56, while 55 has an extension 57 closely fitting the bore in the main body.
  • the cylinder 55 is provided with the piston 58 mounted on a hollow rod 59 carrying a die 60 at its left-hand end. The space between this die and the main die 61 forms a storage chamber in which the first extrusion product through the main die tends to coil.
  • the die 61 is arranged to act as a valve in that it is movable on its seat to permit fluid flow past it when the pressure on the right-hand side exceeds that on the left-hand side.
  • a backstop 62 is provided, the function of which is to hold the billet 63 during the return stroke of the ram.
  • Piston 58 at the other end of the main block is now moved to the left by the application of low pressure to space 66 and this causes corresponding movement of the die 60 and hence extrusion therethrough of the product remaining in the storage chamber from earlier extrusion cycles through the die 61.
  • the increase in pressure in the storage chamber causes the die 61 to shift slightly off it seating and as a result pressure rises in the space 67 forming the first stage extrusion chamber.
  • Piston 58 is now retracted by applying low pressure to space 68 and exhausting space 66, and as this movement takes place, the pressure in the storage chamber falls oif and the die 61 re-seats to maintain the high pressure in the space 67.
  • the pressure in the storage chamber may be allowed to drop to atmospheric pressure on a suitable value of back pressure.
  • Piston 54 is now moved to the right by applying pressure to space 69 and as a result the ram 56 and the billet 63 are moved forward and extrusion takes place through die 61.
  • the magnitude of the pressure applied to the space 69 determines the axial stress in the billet. For extrusion under hydrostatic conditions this should at least equal the radial stresses due to the pressure in space 67, but if a higher extrusion ratio is desired, the axial stress may be arranged to exceed the radial stress so long as it does not do so by more than an amount equal to the flow stress of the billet material.
  • the pressure in space 67 tends to rise but any increase is prevented by the valving action of the seal 70 at the die end of the chamber 65. This has the effect of increasing the pressure in the space 65 which causes the piston 55 to move to the left to maintain the gripping pressure at the predetermined level dependent on the constant pressure in the space 64.
  • the piston 54 shall be capable of slight movement to the left from its normal fully-retracted position during the pressure build-up at the beginning of the cycle, so that the movement of die 61 from its seating is not prevented by the billet acting as a strut between die 61 and ram 56, and to ensure this a pair of Belleville spring washers 73 is provided to prevent the shoulder of piston 54 engaging with the end of the cylinder 52 at the end of the retracting movement.
  • the arrangement just described for pressurising the extrusion chamber depends on the movement of the piston 58 generating pressure in the storage chamber and this cannot take place unless the hole in the die 60 is sealed. This will not be the case when a new billet is inserted into the machine and a special starting operation is therefore necessary. This may consist in the removal of the cylinder 53 together with the die 60 to permit the insertion of a plug in the die. The cylinder is then replaced and several normal cycles are performed which will produce suflicient extrusion product in the storage chamber. Thereupon the cylinder 53 is again detached and the plug removed from the die 60 and replaced by the end of the extrusion product. The cylinder 53 is then replaced and thereafter normal operation is possible.
  • a sealing cap may be placed over the end of the rod 59 which will enable suflicient pressurisation to result for extrusion to take place through the die 61 and the end of the extrusion product will eventually find its way into the die 60, possibly with the assistance of a guide associated therewith in the storage chamber.
  • the present invention may be combined with a continuous casting plant from which stock is fed direct. This presents the advantage that the stock can enter the exrustion plant while still hot, so that with many substances extrusion is much facilitated and higher extrusion ratios are possible with a consequent reduced number of extrusion stages.
  • the sequence of operation in each cycle may be automatically controlled preferably by a suitable tirner which energises electrically operated valves to control the working fluid. After a few trials to determine the optimum periods, this will enable the process to be automatic, particularly if the billet material is being continuously produced.
  • Apparatus for extruding a metal billet of unrestricted length comprising a tubular ram arranged to receive the billet with a small clearance, a die disposed in an extrusion chamber, means for applying radial pressure to the ram to cause it to grip the billet, a jack operatively connected to the ram, means for applying axial pressure to the jack to cause it to advance the ram and billet to promote extrusion of the billet through the die, means for applying fluid pressure to the extrusion chamber of a value sufiicient at least to prevent outward plastic flow of the billet between the ram and the entrance to the die under the axial stress produced by the ram means for applying axial pressure to the jack in the reverse direction at a time when radial pressure is no longer applied to the ram whereby the ram moves backwards over the billet and means for holding the billet stationary during the backward movement of the ram.
  • Apparatus as claimed in claim 1 in which the means for applying radial pressure to the ram comprises a fluid pressure chamber disposed around at least part of the ram.
  • Apparatus as claimed in claim 2 in which the means for applying radial pressure to the ram comprises an annular piston surrounding the tubular ram and movable axially of the ram within the pressure chamber, means for advancing the piston in the direction of the die to pressurise the pressure chamber, unidirectional sealing means preventing flow of fluid from.
  • the pressure chamber includes a fixed tubular supporting member disposed around the ram with a small clearance therefrom and provided with radial slots to permit fluid in the pressure chamber to contact the surface of the ram.
  • Apparatus as claimed in claim 1 including a storage chamber into which the extruded metal issues, a die at the opposite end of the storage chamber and means for applying fluid pressure to the storage chamber whereby continuous extrusion takes place therefrom.
  • valve means are provided between the storage chamber and extrusion chamber operable to permit the flow of fluid from the former to the latter when the pressure in the former exceeds the pressure in the latter but to impede the flow of fluid from the latter to the former.
  • Apparatus as claimed in claim 7 in which the die at the opposite end of the storage chamber is movable axially to raise the pressure in that chamber to a value suflicient to produce hydrostatic extrusion.
  • Apparatus as claimed in claim 7 in which a tubular projection attached to the die at the entrance to the storage chamber and of the same diameter as the neck of the die extends a short distance into the storage chamber and is arranged to contract under pressure in the chamber on to the extrusion product thus preventing backward movement of the extrusion product when pressure is reduced in the extrusion chamber to a level below that of the pressure in the storage chamber.
  • Apparatus as claimed in claim 12 in which a rotatable coiler member is disposed adjacent the tubular projection, said member having an obliquely disposed bore of a diameter similar to that of the tubular projection and arranged to receive the product issuing therefrom and assist it in coiling in the storage chamber.
  • a method of extruding a metal billet of unrestricted length comprising the steps of feeding the billet into a tubular ram of slightly greater diameter than the diameter of the billet, applying radial fluid pressure to the ram to cause it to contract to grip the billet, advancing the ram and hence the billet to produce extrusion through a die, removing the radial pressure to disengage the billet from the ram and retracting the ram while holding the billet stationary.
  • a method as claimed in claim 14 including applying to the billet between the ram and the entrance to the die, a surrounding hydrostatic pressure sufiicient at least to prevent outward plastic flow of the billet under the axial stress applied to it by the ram.
  • a method of extruding a metal as claimed in claim 14 including directing the extruded metal to a storage chamber where it is collected, and applying fluid pressure to the chamber to cause continuous extrusion of the metal through a die at the opposite end of the storage chamber.
  • a method as claimed in claim 16 including gripping the extruded metal issuing from the die at the entrance to the storage chamber when the pressure in the storage chamber exceeds the pressure on the other side of the said die.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
US579901A 1965-09-17 1966-09-16 Apparatus and method of metal extrusion Expired - Lifetime US3449935A (en)

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GB39796/65A GB1155599A (en) 1965-09-17 1965-09-17 Improvements in or relating to Apparatus and Method of Metal Extrusion

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DE (1) DE1527833A1 (US06589383-20030708-C00041.png)
SE (1) SE341794B (US06589383-20030708-C00041.png)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3654794A (en) * 1969-03-07 1972-04-11 Atomic Energy Commission Drawbench
US3667267A (en) * 1969-11-14 1972-06-06 Western Electric Co Apparatus and method for continuous material feeding and deformation
US3672201A (en) * 1969-05-19 1972-06-27 Battelle Development Corp Method and apparatus for shaping tubes
US3677048A (en) * 1969-10-01 1972-07-18 Western Electric Co Method of positive flow extrusion
US3677049A (en) * 1969-10-01 1972-07-18 Western Electric Co Method of and appratus for positive fluid flow extrusion
US3677050A (en) * 1969-10-01 1972-07-18 Western Electric Co Method of postive fluid flow extrusion and optimum fluid control element therefor
US3696652A (en) * 1969-10-01 1972-10-10 Western Electric Co Continuous material deformation process and apparatus therefor
US3738145A (en) * 1969-11-14 1973-06-12 Western Electric Co Apparatus and method for continuous material feeding and deformation process
US3841129A (en) * 1972-03-17 1974-10-15 Kobe Steel Ltd Continuous, hydrostatic extrusion process and an apparatus using the same
USRE28373E (en) * 1969-01-28 1975-03-25 Feeding and deformation
US3884062A (en) * 1968-12-09 1975-05-20 Atomic Energy Authority Uk Forming of materials
FR2336192A1 (fr) * 1975-12-22 1977-07-22 Austen Alfred Appareil et procede pour l'extrusion etagee

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Publication number Priority date Publication date Assignee Title
US524504A (en) * 1893-10-14 1894-08-14 robertson
US524509A (en) * 1894-08-14 James robertson
US524506A (en) * 1894-08-14 James robertson
US1575768A (en) * 1925-02-05 1926-03-09 Henleys Telegraph Works Co Ltd Lead covering of electric cables and the like by extrusion
US2866545A (en) * 1956-05-07 1958-12-30 Calumet & Hecla Internally cooled mandrel
US3201966A (en) * 1961-05-23 1965-08-24 Benteler Werke Ag Apparatus for the extrusion pressing of tubes, especially steel tubes
US3243985A (en) * 1964-09-28 1966-04-05 Atomic Energy Authority Uk Extrusion apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US524509A (en) * 1894-08-14 James robertson
US524506A (en) * 1894-08-14 James robertson
US524504A (en) * 1893-10-14 1894-08-14 robertson
US1575768A (en) * 1925-02-05 1926-03-09 Henleys Telegraph Works Co Ltd Lead covering of electric cables and the like by extrusion
US2866545A (en) * 1956-05-07 1958-12-30 Calumet & Hecla Internally cooled mandrel
US3201966A (en) * 1961-05-23 1965-08-24 Benteler Werke Ag Apparatus for the extrusion pressing of tubes, especially steel tubes
US3243985A (en) * 1964-09-28 1966-04-05 Atomic Energy Authority Uk Extrusion apparatus

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884062A (en) * 1968-12-09 1975-05-20 Atomic Energy Authority Uk Forming of materials
USRE28373E (en) * 1969-01-28 1975-03-25 Feeding and deformation
US3654794A (en) * 1969-03-07 1972-04-11 Atomic Energy Commission Drawbench
US3672201A (en) * 1969-05-19 1972-06-27 Battelle Development Corp Method and apparatus for shaping tubes
US3677048A (en) * 1969-10-01 1972-07-18 Western Electric Co Method of positive flow extrusion
US3677049A (en) * 1969-10-01 1972-07-18 Western Electric Co Method of and appratus for positive fluid flow extrusion
US3677050A (en) * 1969-10-01 1972-07-18 Western Electric Co Method of postive fluid flow extrusion and optimum fluid control element therefor
US3696652A (en) * 1969-10-01 1972-10-10 Western Electric Co Continuous material deformation process and apparatus therefor
US3667267A (en) * 1969-11-14 1972-06-06 Western Electric Co Apparatus and method for continuous material feeding and deformation
US3738145A (en) * 1969-11-14 1973-06-12 Western Electric Co Apparatus and method for continuous material feeding and deformation process
US3841129A (en) * 1972-03-17 1974-10-15 Kobe Steel Ltd Continuous, hydrostatic extrusion process and an apparatus using the same
FR2336192A1 (fr) * 1975-12-22 1977-07-22 Austen Alfred Appareil et procede pour l'extrusion etagee

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SE341794B (US06589383-20030708-C00041.png) 1972-01-17
DE1527833A1 (de) 1970-05-06

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