EP0003773A1 - Verfahren und Vorrichtung zum Kaltfliesspressen von Metallbuchsen, insbesondere für Raupenketten von Raupenfahrzeugen - Google Patents

Verfahren und Vorrichtung zum Kaltfliesspressen von Metallbuchsen, insbesondere für Raupenketten von Raupenfahrzeugen Download PDF

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Publication number
EP0003773A1
EP0003773A1 EP79100356A EP79100356A EP0003773A1 EP 0003773 A1 EP0003773 A1 EP 0003773A1 EP 79100356 A EP79100356 A EP 79100356A EP 79100356 A EP79100356 A EP 79100356A EP 0003773 A1 EP0003773 A1 EP 0003773A1
Authority
EP
European Patent Office
Prior art keywords
section
punch
piece
press
bushing
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.)
Withdrawn
Application number
EP79100356A
Other languages
English (en)
French (fr)
Inventor
Carlo Alberto Cuneo
Carmine Ielpo
Decio Sacco
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.)
Its - Italtractor-Sud-Spa (societe Per Azioni)
Italtractor ITM SpA
Original Assignee
Its - Italtractor-Sud-Spa (societe Per Azioni)
Italtractor ITM SpA
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 Its - Italtractor-Sud-Spa (societe Per Azioni), Italtractor ITM SpA filed Critical Its - Italtractor-Sud-Spa (societe Per Azioni)
Publication of EP0003773A1 publication Critical patent/EP0003773A1/de
Withdrawn legal-status Critical Current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 OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/03—Making uncoated products by both direct and backward extrusion
    • 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
    • B21C23/02—Making uncoated products
    • B21C23/20—Making uncoated products by backward extrusion
    • 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
    • B21K1/02—Making machine elements balls, rolls, or rollers, e.g. for bearings

Definitions

  • the present invention relates to an improved process for the cold extrusion of metal bushings, in particular, for tracks of track-laying tractors or other intended purposes.
  • this process the conventional preforming operation is eliminated, which is necessary in order to obtain a shallow axial dead hole on one end of the workpiece to be transformed in a bushing, said hole serving as guiding means for the punch employed to form the axial hole of said bushing.
  • the invention also relates to an improved apparatus for carryng out said process.
  • an improved process is provided which permits to shorten the operative cycle, eliminating the aforementioned steps 2) to 5) of the conventional process, i.e. performing a direct extrusion, without any preforming of the piece to be processed and using a single, duly improved apparatus.
  • it is necessary to ensure the correct centering between the axis of the hole of the finished bushing and that of the outer surface thereof within a tolerance range from 2/10 to 3/10 mm. It is also necessary to promote the metal flow during the extrusion, so as to prevent the risk of seizure between the extruded piece and the die surface during the extrusion and knockout steps.
  • the bushing is obtained by the use of an apparatus in which the punch will be guided by a floating sleeve mounted thereabout, and bound therewith, said sleeve being designed to be received into a seat arranged about the orifice of the inner forming chamber or cavity of the die, said sleeve preventing any lateral displacement of the punch, thus ensuring the correct centering thereof during the operative stroke of said punch.
  • the axial hole arranged in the die widens so as to form a section of a diameter greater than that of the preceding one, said hole section defining the seat to receive and to retain the guiding sleeve during the operative phase.
  • At 1 is indicated a block or slab cut away from a cylindrical metal rod having the predetermined diameter adapted to obtain a bushing, while at 2 is indicated in Figures 3 and 5 the bushing after the final extrusion step.
  • the bushing is not shown, as appears after the conventional operations of the opening of its bottom and of the gauging thereof, since said operations are "per se" well known.
  • FIG. 2 For comparison purpose, in Figure 2 is shown a block or piece la, afterwards a shallow dead guiding hole has been obtained i.e. so as it appears after the preforming step according to the conventional process, which operation has been eliminated by the present invention.
  • the press 5 will include means to force the punch 4 downwardly or to raise it upwardly.
  • the punch 4 has a slightly outwardly anlarged lower end portion 4a, while according to the present invention a guiding sleeve 6 is slidably mounted about said punch 4..
  • the upper portion of the outer surface of said sleeve 6 has a conical shoulder 6a so as to form a slightly outwardly extending upper peripheral retaining edge.
  • a helical expansion spring 7 which tends to urge the sleeve 6 downwards in cooperation with the effect of the force of gravity acting on the sleeve 6.
  • Said spring 7 is not absolutely necessary, since the weight of the sleeve 6 normally is sufficient in order to maintain the sleeve 6 pressed against the enlarged end 4a of the punch 4.
  • the sleeve 6 is constructed in two halves connected one to another by suitable means.
  • the press die body in which the forming space or cavity for receiving the centering sleeve 6 as well as the guiding hole for the kick-off member or stripper 9 are arranged.
  • said cavity comprises a cylindrical section 10 for guiding the kick-off member or stripper 9, said section then widening so as to form an annular groove 11 of a small radial depth and positioned just at the level of the upper end of the knick-off member 9 which constitutes the lower closure means of the die cavity in the rest condition thereof.
  • the cavity widens with an annular conical shoulder 13, then forming a cylindrical section 14 of a diameter greater than that of the section 12.
  • the section 14 extends upwards with a cylindrical section 16 ending with a flared end portion 17 designed to receive the outwardly extending peripheral edge 6a of the guiding sleeve 6.
  • the punch 4 together with the guiding sleeve 6 is raised and pushed off the press die 8, while the kick-off member 9 is positioned as shown in Figures 4 and 5 so as to flush the lower plane of the annular groove 11 so as to constitute the bottom of the forming chamber.
  • the piece or slab 1 is inserted inside said cavity or chamber and it will be received into the section 12 thereof.
  • the punch 4 is lowered, said punch moving in the direction of the arrow in Figure 4 together with the sleeve 6 under the effect of the weight of this latter, and optionally with the co-operation of the action of the spring 7.
  • the sleeve 6 enters into the section 16 and stops therein, as its outwardly extending peripheral edge 6a abuts against the flared orifice 17 thereof, so that the sleeve 6 will be positioned and remain in such a way as to constitute a guiding and centering means for the punch 4 during the operative downward stroke thereof ( Figure 4).
  • the punch continues its travel downwards, it reachs the piece 1 and penetrates this latter, compressing the material, which at first fills up the annular groove 11 and then, on account of the fact that it cannot flow downwardly, it is pushed upwardly in contact with the inner surface of the section 12. But above the upper end of the section 12 the material meets no more resistance, since the section 14 has a greater diameter and that promotes the flow of the material upwardly, thus preventing any seizing-up of the bushing 2 to the forming surface of the die so that the expulsion of the piece 2 after the removal of the punch 4 together with the guiding sleeve 6 can take place without difficulty and without any possibily that the extruded bushing 2 can be subjected to any deformation.
  • the subsequent steps of the boring of the bushing bottom and of the gauging of the bushing surfaces are conventional.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP79100356A 1978-02-17 1979-02-08 Verfahren und Vorrichtung zum Kaltfliesspressen von Metallbuchsen, insbesondere für Raupenketten von Raupenfahrzeugen Withdrawn EP0003773A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4809478 1978-02-17
IT48094/78A IT1155833B (it) 1978-02-17 1978-02-17 Procedimento perfezionato per l'estrusione a freddo di boccole metalliche in particolare per cingoli di trattori o simili ed attrezzatura per l'attuazione del procedimento

Publications (1)

Publication Number Publication Date
EP0003773A1 true EP0003773A1 (de) 1979-09-05

Family

ID=11264483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79100356A Withdrawn EP0003773A1 (de) 1978-02-17 1979-02-08 Verfahren und Vorrichtung zum Kaltfliesspressen von Metallbuchsen, insbesondere für Raupenketten von Raupenfahrzeugen

Country Status (2)

Country Link
EP (1) EP0003773A1 (de)
IT (1) IT1155833B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2216833A (en) * 1988-03-21 1989-10-18 Arnold & Stolzenberg Gmbh Method of manufacturing a roller chain
US7441645B2 (en) * 2004-12-29 2008-10-28 Garvey Corporation Accumulation table
CN113369329A (zh) * 2021-06-11 2021-09-10 中国兵器工业第五九研究所 一种开放型腔多功能挤压模具
CN116197293A (zh) * 2023-04-27 2023-06-02 中北大学 内外双金属杯型构件反挤压制备模具及构件制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117816834A (zh) * 2024-03-05 2024-04-05 成都德安金属制品有限公司 一种环形工件的冲孔装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE755107C (de) * 1937-11-30 1953-03-16 Rheinmetall Borsig Ag Herstellung nahtloser und verhaeltnismaessig duennwandiger huelsen-foermiger Hohlkoerper aus Leichtmetall mit stegartigen Ansaetzen
GB836706A (en) * 1953-11-12 1960-06-09 Kabel Und Metallwerke Neumeyer Improvements relating to the production of hollow metal bodies by pressing
FR1573668A (de) * 1967-08-04 1969-07-04
GB1207407A (en) * 1968-08-01 1970-09-30 Chesterfield Tube Company Ltd Apparatus for use in forming shells from billets

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE755107C (de) * 1937-11-30 1953-03-16 Rheinmetall Borsig Ag Herstellung nahtloser und verhaeltnismaessig duennwandiger huelsen-foermiger Hohlkoerper aus Leichtmetall mit stegartigen Ansaetzen
GB836706A (en) * 1953-11-12 1960-06-09 Kabel Und Metallwerke Neumeyer Improvements relating to the production of hollow metal bodies by pressing
FR1573668A (de) * 1967-08-04 1969-07-04
GB1207407A (en) * 1968-08-01 1970-09-30 Chesterfield Tube Company Ltd Apparatus for use in forming shells from billets

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
METALWORKING PROD., Jan. 17th 1958 London, J. VERSON: "Practical tooling for could extrusion", pages 105-113. * Page 110; figure 1, page 111; figure 4, page 113 * *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2216833A (en) * 1988-03-21 1989-10-18 Arnold & Stolzenberg Gmbh Method of manufacturing a roller chain
GB2216833B (en) * 1988-03-21 1992-06-03 Arnold & Stolzenberg Gmbh Method of manufacturing a roller chain
US7441645B2 (en) * 2004-12-29 2008-10-28 Garvey Corporation Accumulation table
CN113369329A (zh) * 2021-06-11 2021-09-10 中国兵器工业第五九研究所 一种开放型腔多功能挤压模具
CN116197293A (zh) * 2023-04-27 2023-06-02 中北大学 内外双金属杯型构件反挤压制备模具及构件制备方法

Also Published As

Publication number Publication date
IT7848094A0 (it) 1978-02-17
IT1155833B (it) 1987-01-28

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn
RIN1 Information on inventor provided before grant (corrected)

Inventor name: IELPO, CARMINE

Inventor name: CUNEO, CARLO ALBERTO

Inventor name: SACCO, DECIO