US3380270A - Plugging system for extrusion containers - Google Patents

Plugging system for extrusion containers Download PDF

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Publication number
US3380270A
US3380270A US466225A US46622565A US3380270A US 3380270 A US3380270 A US 3380270A US 466225 A US466225 A US 466225A US 46622565 A US46622565 A US 46622565A US 3380270 A US3380270 A US 3380270A
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US
United States
Prior art keywords
extrusion
lubricant
ram
container
die
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US466225A
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English (en)
Inventor
Sauve Charles
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Commissariat a lEnergie Atomique CEA
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Publication of US3380270A publication Critical patent/US3380270A/en
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Expired - Lifetime legal-status Critical Current

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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, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/21—Presses specially adapted for extruding metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/32—Lubrication of metal being extruded or of dies, or the like, e.g. physical state of lubricant, location where lubricant is applied

Definitions

  • This invention relates to a plugging system for extrusion containers whereby a container of this type can in particular be temporarily closed oft on the one hand on the front side of its die and on the other hand at the rear end of the body or billet to be extruded which is placed within said container, namely between said body and an extrusion ram.
  • the primary object of said system is to ensure a uniform distribution of a lubricating material which has been previously introduced within the container so as to surround the billet entirely between this latter and the container wall.
  • the front shutter consists of a small plate which is held in position between the die and the die-holder and is designed to fail under the pressure exerted by the billet at the commencement of the extrusion process proper.
  • obturators or shutters of the type referred-to above have to be replaced at the end of each extrusion operation.
  • another sealing system consisting of removable members which can either be positioned or withdrawn at predetermined moments, on the one hand in front of the die and on the other hand behind the body to be extruded, one particular result thereby achieved being to permit of suitable injection and distribution of the lubricant within the extrusion container.
  • said rear plug consists of a metal block designed to slide along the stem of the extrusion ram with interposition of packing glands, said block being fitted with means for applying this latter in leak-tight manner against the extremity of the extrusion container, preferably in synchronism with the movement of displacement of the ram.
  • the object of this invention is to improve the arrangements noted above, in particular by making it possible to ensure that hydrostatic pressure of the lubricant is maintained within the extrusion container while the rear plug is applied at the same time against the extremity of said container during the entire movement of displacement of the ram which effects the extrusion operation.
  • the improvement proposed mainly consists in utilizing the relative motion of the ram rod and the metal block which constitutes the rear plug for the purpose of effecting an injection of lubricant under very high pressure into the extrusion container, said lubricant being preferably maintained in the plastic state and at a suitable temperature inside an annular feed reservoir which is formed between the ram rod on the one hand and the metal block on the other hand.
  • the rear portion of the ram rod which has a larger diametrical cr0ss-secti0n serves to force the lubricant out of its reservoir towards the interior of the extrusion container after application of the rear plug and at a suitable pressure, the quantity of lubricant injected being exactly the quantity which is necessary for the purpose of filling under the desired extrusion conditions, the space which is left free between the internal Wall of said container and the body to be extruded.
  • the injection of lubricant is effected at the pressure of extrusion of the body to be extruded, the volume of lubricant injected being very small if it is compared with that which would be necessary in order to fill the chamber if no ram at all were present.
  • the ram has the intended function of thrusting the billet into its position of readiness for extrusion in contact with the die, the injection of lubricant being thus performed partly at the moment when the billet is in the extrusion position after bein thrust therein by the ram.
  • the ram rod moves relatively to the rear plug to an extent which is equal to the displacement within the container as required for extrusion, and as increased to an extent which is necessary for the preliminary injection of a given quantity of lubricant.
  • FIGS. 1, 2, 3 and 4 are diagrammatic views in partial cross-section of a horizontal extrusion press which entails the application of the improvement considered.
  • the press which is illustrated comprises a header 1 which serves to hold in position by means of a support member 2 a die-holder 3 for a die 4; said die is placed at the end of the cavity 5 of an extrusion container 6.
  • the preliminary closure at the front end of the die 4 is effected by means of a removable plug 7 which can be withdrawn at the beginning of the extrusion operation by any suitable means.
  • the closure means consist of a metal block 8, the corresponding end of which is adapted to fit within a conical flare 9 formed in the end of the cavity 5.
  • the rod 10 of a ram 11 is adapted to pass axially through the metal plugging block 8 and is extended towards the right hand side of the drawing by a portion 12 having a transverse cross-section which is slightly larger than that of the central portion of the rod.
  • a portion 12 having a transverse cross-section which is slightly larger than that of the central portion of the rod.
  • annular recess 13 which can be filled with a quantity of suitable lubricant introduced through an admission duct 14 formed through the body of the block 8.
  • the complete or partial filling of the annular space 13 by the lubricant is obtained by means of a high pressure pump (not shown in the drawings) which comes into action when the ram 3 and the rear block 8 are in the open position which is shown in FIG. 1.
  • FIG. 1 the different members referred-to above are shown in the position corresponding to the beginning of an operation involving the extrusion of a body or billet 15 which is carried in a cradle support 16.
  • the billet 15 is thrust into the cavity 5 of the container 6 under the action of the ram 11 as this latter moves forward together with the metal block 8 which forms a rear plug.
  • the billet 15 is thrust forward by the ram 11 and thus brought into a position such that the front face of said billet is located at a distance of a few centimeters from the die 4, as shown in FIG. 2.
  • the ram 11 continues to move from the right hand side to the left hand side in the drawing and, during the initial part of this movement, causes the lubricant to fill the entire space which is left free between the billet 15 and the internal wall of the cavity 5, as shown in FIG. 3.
  • the injection of lubricant takes place under the effect of the movement of the portion 12 of the end of the ram rod within the annular space 13. It should be noted that, at this stage of operations, the pressure at which the lubricant is injected is maintained by the front plug 7 which is placed in front of the die and which therefore closes off said die in a leak-tight manner.
  • a fourth step as the forward movement of the ram 11 proceeds, the ram places the billet l5 opposite the die 4.
  • the extrusion process proper commences at this moment at the same time as the plug 7 withdraws.
  • the lubricant continues to be injected at very high pressure as a result of the forward displacement of the ram.
  • a by-pass system (not shown in the drawings) permits the evacuation of excess lubricant while the quantity which is necessary for the extrusion process itself continues to be injected into the extrusion container at the pressure which is required in .order to force the metal through the die, as shown in FIG. 4.
  • the seals employed, in particular for the purpose of providing leak-tightness between the metal block which forms a rear plug and the different parts of the ram rod are sliding seals having good mechanical properties for the purpose of affording resistance both to attrition and to heat.
  • the seals employed consist of O-ring seals formed of stamped metal members which have a sufiicient degree of elasticity to allow the liquid lubricant to flow in one direction only.
  • the rubbing portions .of said seals are preferably formed of a metal which is softer than the steel of which the extrusion container and the ram rod are usually fabricated.
  • said Oring seals can consist of two or a number of layers of bonded metals, the outer layer having suitable mechanical characteristics for the purpose of ensuring a good contact with the steel whilst the inner layer is formed of a metal having a higher yield strength at operating temperatures.
  • An extrusion device comprising an extrusion container, a cylindrical chamber opening through said container containing the body to be extruded, a die at .one end of said chamber, an extrusion ram, a ramrod for said ram, a slidable plugging block closing the other end of said chamber and slidably mounting said ram and said ramrod, the relative motion of said ramrod and said plugging block producing an injection of lubricant under very high pressure into said chamber and an annular feed-reservoir between said ramrod and said plugging block, said lubricant being maintained in the plastic state and at a suitable temperature in said reservoir.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Extrusion Of Metal (AREA)
US466225A 1964-07-03 1965-06-23 Plugging system for extrusion containers Expired - Lifetime US3380270A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR980629A FR1417146A (fr) 1964-07-03 1964-07-03 Système d'obturation pour enceinte de filage

Publications (1)

Publication Number Publication Date
US3380270A true US3380270A (en) 1968-04-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
US466225A Expired - Lifetime US3380270A (en) 1964-07-03 1965-06-23 Plugging system for extrusion containers

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US (1) US3380270A (enrdf_load_html_response)
BE (1) BE665719A (enrdf_load_html_response)
CH (1) CH448944A (enrdf_load_html_response)
DE (1) DE1452248A1 (enrdf_load_html_response)
DK (1) DK116198B (enrdf_load_html_response)
ES (1) ES314877A1 (enrdf_load_html_response)
FR (1) FR1417146A (enrdf_load_html_response)
GB (1) GB1063950A (enrdf_load_html_response)
IL (1) IL23808A (enrdf_load_html_response)
LU (1) LU48930A1 (enrdf_load_html_response)
NL (1) NL6508462A (enrdf_load_html_response)
NO (1) NO116900B (enrdf_load_html_response)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3817069A (en) * 1972-05-25 1974-06-18 Ford Motor Co Continuous hydrostatic extrusion die assembly and method for using it in forming extruded parts
US4305270A (en) * 1979-11-13 1981-12-15 Kokovikhin Evgeny A Hydrostatic pressing apparatus
US11123936B2 (en) 2015-12-16 2021-09-21 Cytec Industries Inc. Resin infusion process for manufacturing fiber-reinforced composites

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1321096A (en) * 1919-11-11 Metajxpiercing
US3072251A (en) * 1959-01-27 1963-01-08 Commissariat Energie Atomique Process and device for extrusion

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1321096A (en) * 1919-11-11 Metajxpiercing
US3072251A (en) * 1959-01-27 1963-01-08 Commissariat Energie Atomique Process and device for extrusion

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3817069A (en) * 1972-05-25 1974-06-18 Ford Motor Co Continuous hydrostatic extrusion die assembly and method for using it in forming extruded parts
US4305270A (en) * 1979-11-13 1981-12-15 Kokovikhin Evgeny A Hydrostatic pressing apparatus
US11123936B2 (en) 2015-12-16 2021-09-21 Cytec Industries Inc. Resin infusion process for manufacturing fiber-reinforced composites

Also Published As

Publication number Publication date
NO116900B (enrdf_load_html_response) 1969-06-09
GB1063950A (en) 1967-04-05
IL23808A (en) 1969-05-28
ES314877A1 (es) 1966-06-01
FR1417146A (fr) 1965-11-12
LU48930A1 (enrdf_load_html_response) 1965-08-31
CH448944A (fr) 1967-12-31
BE665719A (enrdf_load_html_response)
NL6508462A (enrdf_load_html_response) 1966-01-04
DK116198B (da) 1969-12-22
DE1452248A1 (de) 1969-01-30

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