US3782159A - Isostatic working process - Google Patents

Isostatic working process Download PDF

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Publication number
US3782159A
US3782159A US00263612A US3782159DA US3782159A US 3782159 A US3782159 A US 3782159A US 00263612 A US00263612 A US 00263612A US 3782159D A US3782159D A US 3782159DA US 3782159 A US3782159 A US 3782159A
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US
United States
Prior art keywords
die
workpiece
chamber
compression chamber
covering material
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
US00263612A
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English (en)
Inventor
C Martinet
Original Assignee
Peugeot & Renault
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 Peugeot & Renault filed Critical Peugeot & Renault
Application granted granted Critical
Publication of US3782159A publication Critical patent/US3782159A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • 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
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4981—Utilizing transitory attached element or associated separate material

Definitions

  • the present invention relates to a process for the working of pieces of metal by high-pressure isostatic die-stamping.
  • the compression of the workpiece between its two dies ensures the shaping thereof in the traditional way.
  • the enclosure of high-pressure liquid containing the workpiece and the dies compensates its reduction in volume at the time of closing of the two dies on to the workpiece by ejecting its excess liquid through an escape-channel system provided with a valve ensuring the control of the rate of escape and thus of the resultant hydrostatic pressure.
  • the liquid enclosure method is not well suited to the rapid changes and the cycles of production in industry.
  • It consists of a. pre-covering the workpiece-blank in a material of appropriate plasticity, forming in the ambient conditions a body whose dimensions are slightly smaller than those of a compression chamber b. introducing the workpiece into said compression chamber, the bottom of which is constituted by the moulding impression of the bottom die, and closing the compression chamber over the workpiece by lowering a stamper or top die into the compression chamber, the surface of said top die forming the moulding impression for the workpiece c.
  • this possibility enables one to increase the isostatic pressure according to the amount of deformation of the workpiece during working. There are thus reduced the concentrations of pressure on the workpiece and the corresponding zones of coldworking. There likewise result a better control and an economy of power used.
  • the apparatus used remains very simple and reliable.
  • the removal of the article produced and of its extruded covering is effected by the mere return of the top die, to which the working pressure makes them adhere and from which they are then detached by a retaining comb, the top die continuing its ascent travel.
  • Tapers on the top die and on the walls of the compression chamber may be provided in order to facilitate these successive stripping operations.
  • FIG. 1 illustrates diagrammatically the stages of covering the workpiece and inserting it into the pressure chamber of the press
  • FIG. 2 illustrates the entry of the top die
  • FIG. 3 illustrates the beginning of deformation of a workpiece and the simultaneous extrusion of the covering material
  • FIG. 4 illustrates the top die at the end of its descent travel, the working of the piece being complete
  • FIG. 5 illustrates the stripping of the covering and of the workpiece by return of the top die through a removal plate, and also the insertion of a new covered workpiece into the pressure chamber, this being brought into position by the removal tray of the previous workpiece.
  • FIG. 1 there is illustrated a traditional workpiece l, which is covered by a plastic material 2 so as to form a generally cylindrical ingot of slightly smaller diameter than the compression chamber 3 which is to accommodate it.
  • This covering is produced by casting, injection under pressure, compacting, or any other appropriate technique according to the nature of the material chosen,
  • the alloy which melts at a temperature in the order of 70 C, is particularly suitable.
  • This low melting temperature simplifies the covering of the workpieces and also the removal and recovery of this covering after the working. Its high cost price is compensated by its total recovery and'its recycling by melting and re-use after extrusion.
  • the covered ingot may have details of shape such as bevels, grooves, etc. intended to facilitate the handling and insertion of the ingots.
  • the top die 8 After insertion of the ingot 1 covered with plastic material 2, into the pressure chamber 3 whose walls are constituted by collars 4 and 5 and the floor by the bottom die 6 mounted on the base 7 of the press, the top die 8 is lowered as indicated in FlG. 2, its surface 9 containing the upper shaping impression.
  • the top die 8 may contain variations of cross-section 10 which cause corresponding reductions in the crosssection of extruded covering material when they engage in the pressure chamber 3, and a correlative increase in its pressure.
  • there may likewise be provided on the top die grooves of decreasing cross-section and depth, or any other similar shape compatible with the latter requirements of stripping of the extruded product.
  • FIG. 3 shows the workpiece l at the commencement of its deformation, while the covering material 2 emerges by extrusion between the top die 8 and the collar 4, through the clearance 11 provided for this purpose.
  • top die 8 has reached the end of its travel and the deformation of the workpiece l is complete.
  • the greater part of the covering material has been extruded or else occupies the clearances 11 provided between the top die 8 and the collar 4.
  • the top die 8 now commences its ascent travel, taking with it the covering 2 and the workpiece l which remains adhering to the top die, owing to the fact that its die-stamping seam tig'htly overlaps the remainder of the covering material 2 in the clearance 11 between the dies 9 and 6.
  • FIG. 5 shows the top die 8 continuing its movement of withdrawal past a separation plate 12 forming a retention comb for the extruded covering material 2, until it is separated from the end of the top die 8, taking with it the workpiece 1 on to a removal tray 13 which has been positioned below the top die 8 at the time of the withdrawal thereof.
  • This tray 13 may hold in its lower part the next covered ingot 1, 2, which has been brought into the insertion position over the collar 4.
  • a lowering of the tray 13 engages the ingot into the compression chamber 3. Removal of the tray 13 with the previous workpiece then releases the covered ingot, which drops to the bottom of the pressure chamber 3.
  • the working cycle described above may then recommence.
  • a process for isostatic pressure molding of deformable materials in a compression chamber having first and second relatively movable stamping dies comprising the steps of: covering a workpiece-blank with a plastic material to form an ingot having dimensions which are smaller than the corresponding dimensions of said compression chamber, said plastic covering material being selected to have a plasticity which, in combination with the clearance between said first die and said chamber, produces an extrusion pressure corresponding to the desired isostatic pressure for shaping said workpiece-blank; introducing said ingot into said chamber and covering said chamber to sandwich said ingot between said first and second stamping dies in said chamber;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
US00263612A 1971-06-17 1972-06-16 Isostatic working process Expired - Lifetime US3782159A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7122098A FR2141587B1 (enExample) 1971-06-17 1971-06-17

Publications (1)

Publication Number Publication Date
US3782159A true US3782159A (en) 1974-01-01

Family

ID=9078843

Family Applications (1)

Application Number Title Priority Date Filing Date
US00263612A Expired - Lifetime US3782159A (en) 1971-06-17 1972-06-16 Isostatic working process

Country Status (6)

Country Link
US (1) US3782159A (enExample)
JP (1) JPS5342578Y2 (enExample)
DE (1) DE2229558A1 (enExample)
FR (1) FR2141587B1 (enExample)
GB (1) GB1389693A (enExample)
IT (1) IT959839B (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5406825A (en) * 1993-04-28 1995-04-18 Asahi Glass Company Ltd. Forging die

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5337477A (en) * 1993-07-21 1994-08-16 Amcast Industrial Corporation Methods and apparatus for forming tubular risers and manifolds including tubular risers
CN109570432B (zh) * 2018-10-29 2020-04-03 东北轻合金有限责任公司 一种基于冲孔用剪切模具的铝合金锻环制造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE842296C (de) * 1948-10-19 1952-06-26 Werner Dipl-Ing Schlegel Verfahren und Vorrichtungen zur Herstellung von Pressteilen aus schmiedbaren Werkstoffen
US3184945A (en) * 1962-03-29 1965-05-25 Brush Beryllium Co Method and apparatus for hot pressure forming and back extruding
US3286337A (en) * 1963-08-20 1966-11-22 Commissariat Energie Atomique Processes for shaping metals under high hydrostatic pressure
GB1107871A (en) * 1965-03-08 1968-03-27 Imp Metal Ind Kynoch Ltd Improvements in or relating to methods and apparatus for extruding brittle metals
US3383891A (en) * 1965-10-20 1968-05-21 Robert C. Geitz Superhydraulic forging method and apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE842296C (de) * 1948-10-19 1952-06-26 Werner Dipl-Ing Schlegel Verfahren und Vorrichtungen zur Herstellung von Pressteilen aus schmiedbaren Werkstoffen
US3184945A (en) * 1962-03-29 1965-05-25 Brush Beryllium Co Method and apparatus for hot pressure forming and back extruding
US3286337A (en) * 1963-08-20 1966-11-22 Commissariat Energie Atomique Processes for shaping metals under high hydrostatic pressure
GB1107871A (en) * 1965-03-08 1968-03-27 Imp Metal Ind Kynoch Ltd Improvements in or relating to methods and apparatus for extruding brittle metals
US3383891A (en) * 1965-10-20 1968-05-21 Robert C. Geitz Superhydraulic forging method and apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5406825A (en) * 1993-04-28 1995-04-18 Asahi Glass Company Ltd. Forging die

Also Published As

Publication number Publication date
FR2141587B1 (enExample) 1974-03-08
JPS5342578Y2 (enExample) 1978-10-13
DE2229558A1 (de) 1973-01-18
JPS52170835U (enExample) 1977-12-26
IT959839B (it) 1973-11-10
GB1389693A (en) 1975-04-03
FR2141587A1 (enExample) 1973-01-26

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