EP0010510B1 - Perfectionnement aux procédés et dispositifs d'extrusion hydrostatique continue de métaux - Google Patents

Perfectionnement aux procédés et dispositifs d'extrusion hydrostatique continue de métaux Download PDF

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Publication number
EP0010510B1
EP0010510B1 EP79420047A EP79420047A EP0010510B1 EP 0010510 B1 EP0010510 B1 EP 0010510B1 EP 79420047 A EP79420047 A EP 79420047A EP 79420047 A EP79420047 A EP 79420047A EP 0010510 B1 EP0010510 B1 EP 0010510B1
Authority
EP
European Patent Office
Prior art keywords
groove
fluid
blank
stator
drive fluid
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
Application number
EP79420047A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0010510A1 (fr
Inventor
Marc Moreau
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.)
Trefimetaux SAS
Original Assignee
Trefimetaux SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Trefimetaux SAS filed Critical Trefimetaux SAS
Publication of EP0010510A1 publication Critical patent/EP0010510A1/fr
Application granted granted Critical
Publication of EP0010510B1 publication Critical patent/EP0010510B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • B21C23/005—Continuous extrusion starting from solid state material
    • 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
    • B21C23/007—Hydrostatic extrusion
    • B21C23/008—Continuous extrusion

Definitions

  • the present invention relates to improvements to methods and devices for continuous hydrostatic extrusion.
  • the blank to be extruded is first of all shaped to reveal two substantially parallel flat faces, then introduced into a channel formed by two coaxial members in rotary motion, the mobile member called “rotor”, carrying a groove of revolution deeper than wide, traced on its surface and comprising two substantially parallel lateral faces, the other member known as a “stator” forming with the bleed a channel closed by a lug secured to the fixed member and carrying, at less, a sector.
  • the blank to be extruded is applied to the walls or the bottom of the groove formed in the rotor, under the action of the viscous fluid, in such a way that said blank is driven by the rotor without sliding, towards an extrusion chamber from which it is spontaneously extruded through a die.
  • the viscous fluid is brought above the product to be extruded, at the extrusion pressure in the vicinity of the die and at lower pressures at one or more points located between the inlet of the product and the die.
  • the pressure distribution of the viscous fluid above the product is such that the adhesion of the two generators of the product in contact with the sides of the trapezoidal groove is sufficient to ensure the entrainment of the product by metal-metal contact, without slipping. relative to the rotor.
  • the die out of the groove, which allows it to be made more accessible and to be dimensioned more widely. From the outlet of the groove to the die, the product passes through a chamber formed in the stator where the extrusion pressure prevails, called the isostatic chamber.
  • the working pressure can reach 1600 MPa and the average leakage rate of the viscous fluid is of the order of 25 to 30 milliliters per second. Given the efficiency, this corresponds to a pumping power which is in the range of 50 to 100 kilowatts.
  • the pressure multipliers with large flow rates are subjected to very hard work and the entire apparatus requires relatively large and expensive maintenance. The problem therefore arose of reducing the leakage rate of the working fluid to a strict minimum while maintaining adequate lubrication of the die by means of a sufficient leakage rate.
  • the object of the present invention is an improvement of the process and of the hydrostatic extrusion device which have just been described, and which makes it possible to have a very low leakage flow rate in the groove, and to ensure the lubrication of the die at the passage of the blank.
  • the improved process relates to the continuous hydrostatic extrusion of a first object, called a blank, of indefinite length, into a second object of equally indefinite length, but of different section, in which the blank, surrounded by a substantial quantity of a viscous fluid is introduced into a groove, cut in a drive rotor and facing a stator forming a cover, applied to the rotor, directly receiving, by an introduction means, the viscous fluid known as the driving fluid, in which is generated by a progressive penetration of a step of the cover into the groove, a progressively increasing pressure from the entry point, at ambient pressure to the isostatic chamber where the extrusion pressure prevails, thus ensuring adhesion at all points sufficient for the movement of the rotor to cause said blank with a negligible slip from upstream, at ambient pressure to downstream, at the entrance to the isostatic chamber from where e It escapes by hydrostatic extrusion through at least one die orifice, the viscosity of the working fluid located in the groove being greater than that of
  • the working fluid is an alkaline or alkaline-earth salt of a fatty acid chosen from oleic, sebacic, stearic and palmitic acids, which allows greater clearance between the rotor and the stator, without increasing the leakage rate.
  • a fatty acid chosen from oleic, sebacic, stearic and palmitic acids
  • the driving fluid contained in the bleeding and the fluid located in the vicinity of the die may be originally in a solid, liquid, liquefied, pasty or pulverulent state, having a flowability under the conditions of temperature and pressure. reigning in the bleeding and in the isostatic chamber.
  • the fatty acid salt in particular, calcium stearate is chosen.
  • the fluid located in the isostatic chamber it can be given a viscosity lower than that of the working fluid located in the groove, or, if it is the same substance, by bringing it to a higher temperature by heating the isostatic chamber or cooling the bleeding, either by choosing a fluid different from the working fluid and having, by nature, a viscosity at equal temperature, lower than that of the working fluid located in the bleeding.
  • This fluid can be a liquid, such as a liquid hydrocarbon, but also a gas liquefied under the pressure prevailing in the isostatic chamber: for example butane, propane, carbon dioxide.
  • the implementation of the process is linked to the viscosity of the fluids used and the viscosity itself being dependent, under a given pressure, on the temperature, it is important to be able to maintain the temperature of the fluid (s), as well in the bleeding only in the isostatic chamber at a suitable value, either that it is heated to decrease the viscosity, or that it is cooled to remove the heat given off by the extrusion process and increase the viscosity of the fluid (s).
  • the improved device which is also an object of the invention, and which allows the continuous hydrostatic extrusion of a first object known as a blank, of indefinite length, into a second object of equally indefinite length, but of different section, comprises two cooperating coaxial members, one mobile said rotor carrying, traced on its surface, a groove of revolution receiving the blank to be extruded, the other fixed, said stator, forming a first sector of the groove containing the blank and the fluid motor, a cover that is substantially leaktight with respect to said fluid, the stator also comprising, in a second sector of the groove, located downstream from the previous one, a so-called lug relief completely obstructing the section of the groove and exactly adjusted to it ci, to make it sufficiently tight vis-à-vis the working fluid, the stator comprising a means for feeding the bleeding in working fluid, as well as an orifice located opposite the first sector of the bleeding, in the vicinity of the seco nd sector and opening, by an elongated conduit passing through the stator
  • the driving fluid consists of an alkaline or alkaline earth salt of a fatty acid chosen from oleic, sebacic, stearic and palmitic acids.
  • it may include means for regulating the temperature of each fluid.
  • the isostatic chamber can be provided with a closable orifice which can be connected to a pressure injection means, of a fluid with a viscosity lower than that of the working fluid.
  • Figures 1 and 2 show two profiles of the groove in which the blank is entrained.
  • Figure 3 shows the die through which the blank is extruded.
  • Figure 4 shows the general arrangement of the extrusion device according to the invention.
  • Figure 5 shows schematically the evolution of the pressure in the bleeding.
  • the blank (1) is arranged in the trapezoidal cross-section groove (2) formed in the rotor (3).
  • the blank rests on the sides of the groove, but it is driven without sliding, that is to say without metal-to-metal friction.
  • the fluid pressure is generated by the spiral step (4) of the stator, as in patent FR 2,310,813.
  • a groove (5) with parallel faces FIG. 2
  • the blank is entirely surrounded by the working fluid, without contact between the blank and the walls of the groove.
  • the stator (6) may have one or more orifices (7) locally connecting the groove of the rotor to a radial duct (8). It is thus possible to adjust the pressure in the corresponding zone of the groove by injecting through the orifice or orifices (7) a supplement of working fluid, or, on the contrary, by allowing the escape of an excess.
  • the working fluid could no longer necessarily be a "fluid" in the conventional sense of the term, but a liquid, liquefied, pasty or pulverulent, or even solid substance, having under the conditions of temperature and pressure prevailing in the bleeding. and in the extrusion chamber, a flowability.
  • the fatty acid salts, characterized in the claim have, under the pressures used, of the order of several thousand bars, a flowability which allows their use both as an agent for transmitting hydrostatic pressure.
  • This fluid can be any liquid hydrocarbon, natural or synthetic oils, or even simple petroleum (also called kerosene).
  • the viscosity of a substance decreases, under a given pressure, when the temperature rises, it may be advantageous to provide the extrusion device with known means for bringing the temperature of the fluid, locally or in its together at a suitable value. This is how we can either heat the isostatic chamber or cool the groove (and possibly the blank), so that the fluid located in the groove retains a viscosity higher than that of the fluid located in the chamber. isostatic, in accordance with the invention.
  • the viscous fluid is calcium stearate
  • a copper blank 10 millimeters in diameter was introduced, driven at a speed of 0.50 meters per second.
  • the working fluid is calcium stearate powder.
  • the active part of the rotor shown diagrammatically in FIG. 5 by the thickened part of the outer circle, has a length of 2.5 meters and the groove has a section of 80 ⁇ 10 mm at the entrance, gradually decreasing, according to the diagram in FIG. 5 , up to 20x10 at the inlet of the channel (12), leading to the die, the outlet diameter of which is 2 mm, this arrangement ensuring the pressure gradient along the groove up to the isostatic chamber.
  • the powder is injected through the orifice (13) under a low or zero pressure which increases up to approximately 1500 MPa at the inlet of the channel (12).
  • the bottom of the groove can then have any shape, as well as the product to be extruded, on the only condition that it can be accommodated in the groove (5).
  • Example 2 The operation was carried out under conditions identical to those of Example 1, but the orifice (11) was closed and the area of the isostatic chamber was heated so as to bring its temperature to 180 ° C., corresponding to the point of Beginning liquefaction of calcium stearate. There was obtained, without difficulty and without jamming of the die, the extrusion of a 2 mm wire.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Powder Metallurgy (AREA)
  • Extrusion Of Metal (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
EP79420047A 1978-10-12 1979-10-09 Perfectionnement aux procédés et dispositifs d'extrusion hydrostatique continue de métaux Expired EP0010510B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7829852A FR2438508A1 (fr) 1978-10-12 1978-10-12 Perfectionnement aux procedes et dispositifs d'extrusion hydrostatique continue de metaux
FR7829852 1978-10-12

Publications (2)

Publication Number Publication Date
EP0010510A1 EP0010510A1 (fr) 1980-04-30
EP0010510B1 true EP0010510B1 (fr) 1983-08-31

Family

ID=9213950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79420047A Expired EP0010510B1 (fr) 1978-10-12 1979-10-09 Perfectionnement aux procédés et dispositifs d'extrusion hydrostatique continue de métaux

Country Status (13)

Country Link
US (1) US4343169A (it)
EP (1) EP0010510B1 (it)
JP (1) JPS5557320A (it)
BE (1) BE879340A (it)
CA (1) CA1123382A (it)
CH (1) CH633732A5 (it)
DE (1) DE2966114D1 (it)
FR (1) FR2438508A1 (it)
IT (1) IT1123790B (it)
LU (1) LU81781A1 (it)
PL (1) PL124902B1 (it)
YU (1) YU245479A (it)
ZA (1) ZA795430B (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5740688A (en) * 1995-10-05 1998-04-21 Sural Tech Pressure-assisted formation of shaped articles
US10589335B1 (en) 2018-10-11 2020-03-17 Capital One Services, Llc Apparatus and method of shaping metal product
CN121043441B (zh) * 2025-10-31 2026-02-03 四川宏瑞得新材料科技有限公司 一种石墨成型用等静压机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128843A1 (it) * 1971-03-12 1972-10-20 Atomic Energy Authority Uk
FR2310813A1 (fr) * 1975-05-14 1976-12-10 Trefimetaux Procede et dispositif d'extrusion continue
FR2373339A1 (fr) * 1976-12-07 1978-07-07 Trefimetaux Procede et dispositif d'extrusion hydrostatique continue

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738138A (en) * 1969-11-14 1973-06-12 Western Electric Co Continuous material feeding and deformation process
US3731509A (en) * 1969-11-14 1973-05-08 Western Electric Co Continuous material feeding and deformation process
JPS541660B2 (it) * 1973-06-23 1979-01-27
JPS5524962B2 (it) * 1974-02-02 1980-07-02
JPS55128B2 (it) * 1974-02-06 1980-01-05
JPS50119853A (it) * 1974-03-08 1975-09-19
BR7502740A (pt) * 1974-05-07 1976-03-16 Atomic Energy Authority Uk Processo e aparelho de extrusao
JPS5138316A (ja) * 1974-09-28 1976-03-31 Matsushita Electric Works Ltd Kyokasementokokabutsuno seiho
US4111023A (en) * 1975-05-14 1978-09-05 Trefimetaux Method for continuous extrusion
US4163377A (en) * 1976-11-10 1979-08-07 Trefimetaux Continuous hydrostatic extrusion process and apparatus
JPS5367666A (en) * 1976-11-30 1978-06-16 Furukawa Electric Co Ltd Continuous extrude working method and said device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128843A1 (it) * 1971-03-12 1972-10-20 Atomic Energy Authority Uk
FR2310813A1 (fr) * 1975-05-14 1976-12-10 Trefimetaux Procede et dispositif d'extrusion continue
FR2373339A1 (fr) * 1976-12-07 1978-07-07 Trefimetaux Procede et dispositif d'extrusion hydrostatique continue

Also Published As

Publication number Publication date
FR2438508B1 (it) 1981-02-27
LU81781A1 (fr) 1980-05-07
JPS5622404B2 (it) 1981-05-25
ZA795430B (en) 1980-09-24
PL218852A1 (it) 1980-06-16
FR2438508A1 (fr) 1980-05-09
YU245479A (en) 1983-01-21
JPS5557320A (en) 1980-04-28
PL124902B1 (en) 1983-03-31
CA1123382A (fr) 1982-05-11
US4343169A (en) 1982-08-10
IT7926383A0 (it) 1979-10-10
BE879340A (fr) 1980-04-11
EP0010510A1 (fr) 1980-04-30
DE2966114D1 (en) 1983-10-06
IT1123790B (it) 1986-04-30
CH633732A5 (fr) 1982-12-31

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