EP0119177A2 - Verfahren und Vorrichtung zum Schmieren einer Form in einem Schmiedewerkzeug - Google Patents

Verfahren und Vorrichtung zum Schmieren einer Form in einem Schmiedewerkzeug Download PDF

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Publication number
EP0119177A2
EP0119177A2 EP84850045A EP84850045A EP0119177A2 EP 0119177 A2 EP0119177 A2 EP 0119177A2 EP 84850045 A EP84850045 A EP 84850045A EP 84850045 A EP84850045 A EP 84850045A EP 0119177 A2 EP0119177 A2 EP 0119177A2
Authority
EP
European Patent Office
Prior art keywords
cavity
nozzle
spray
lubricant
lubricating
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Withdrawn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
EP84850045A
Other languages
English (en)
French (fr)
Other versions
EP0119177A3 (de
Inventor
Mats Strömgren
Urban Björk
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.)
Hoganas AB
Original Assignee
Hoganas AB
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 Hoganas AB filed Critical Hoganas AB
Publication of EP0119177A2 publication Critical patent/EP0119177A2/de
Publication of EP0119177A3 publication Critical patent/EP0119177A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J3/00—Lubricating during forging or pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0005—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses
    • B30B15/0011—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses lubricating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F2003/026—Mold wall lubrication or article surface lubrication

Definitions

  • the invention relates to a method and apparatus for lubricating a forming cavity in a forging tool.
  • the lubricant is applied in the form of a spray on the surface of the cavity with the aid of a nozzle.
  • the invention particularly relates to lubricating tools intended for forging blanks produced using powder metallurgy.
  • forging In forging mass-produced, generally annular details produced using powder metallurgy, forging is generally carried out in a so-called closed tool, the lower die of which has an annular cavity in which the blank produced by powder metallurgy is put.
  • the upper die has an annular stamping surface insertable in the lower die cavity.
  • the box has had a plurality of individual nozzles separated along its periphery, through which the lubricant is sprayed towards the stamping surface of the upper die and the forming cavity of the lower die.
  • the lubricant mist is established either by expelling the lubricant with the aid of compressed air through the nozzles or it is sprayed out under high pressure through the nozzles. If a large number of nozzles is arranged along the periphery of the distribution box, it has been found difficult to provide uniform flows through the nozzles, due to the difficulty of maintaining a uniform pressure in the distribution box, and the nozzles easily obtain different through-flow areas.
  • the nozzles are formed by a plurality of small orifices evenly distributed over the curved surface of the distribution box, somewhat better distribution of the lubricant over the active surface of the tool thus being obtained.
  • lubrication will still be unsatisfactory in the forming cavity of the lower die, and especially at the lower defining surface of the cavity as well as the lower parts of the radially inner and outer limiting walls of the cavity.
  • One object of the invention is to provide a technique enabling removal of the mentioned drawbacks with unsatisfactory lubrication of an annular cavity in a forging tool for forging details produced by powder metallurgy.
  • the invention is based on a method of lubricating a forming cavity in a forging tool, a lubricant being applied in the form of a spray against the surface of the cavity with the aid of a nozzle, and is essentially distinguished in that the nozzle is adapted to give a lubricant spray, the impingement area of which against the cavity constitutes a fraction of the surface thereof, and in that the nozzle is displaced relative the cavity such that the impingement area of the spray sweeps over the entire surface of the cavity.
  • the nozzle may be adapted to give a lubricant spray, the impingement area of which against the cavity covers the cavity's radial extension along a limited part of the periphery of the cavity, the nozzle being displaced in the peripheral direction of the cavity.
  • An inventive apparatus for lubricating a forming cavity in a forging tool includes a nozzle adapted to apply a spray of lubricant on the surface of the cavity and is essentially distinguished in that the nozzle is adapted to give a lubricant spray, the impingement area of which against the cavity constitutes a fraction of the cavity surface, and that means are arranged for displacing the nozzle relative the cavity, such that the entire surface of the cavity is swept over by the impingement area of the lubricant spray.
  • the nozzle can be adapted to give a spray, the impingement area of which against the cavity covers the radial extension of the cavity along a limited part of its periphery, the means being adapted to displace the nozzle in the peripheral direction of the cavity.
  • These means may include a carrier supporting the nozzle, the carrier being adapted such as to enable its displacement from and to a position above the cavity, and in the position above the cavity to displace the nozzle in a path along the periphery thereof.
  • the means can include an arm, one end of which carries the nozzle, its other end being mounted on a carrier, as well as means for displacing the carrier to and from a position wherein its mounting axis is coaxial with the cavity axis, the arm being adapted to support the nozzle in a position for spraying lubricant on a peripheral section of the cavity and for swinging the arm around its mouting axis.
  • the method and apparatus in accordance with the invention has been found to circumvent the disadvantages associated with the previously known technique.
  • a possible explanation of the disadvantages occurring with the previously known technique may be that for spray containing a flow of air, irrespective of whether the spray is formed by compressed air or the like or not, there is created a return air flow in the bottom portions of the cavity which is so large that this counterflow restricts the possibility of depositing the lubricant drops on the bottom portions of the cavity and particularly in corner areas in the cavity.
  • the effect gained with the aid of the invention would depend on the return flow from the spray being able to depart from the cavity to one side of the spray jet coming from the nozzle towards the surface of the cavity.
  • the nozzle is preferably kept in one plane with the aid of suitable means, and at a substantially constant distance from the bottom of the cavity during its displacement.
  • the invention is particularly suitable in conjunction with forming cavities having sharp corners in the bottom area of the cavity, e.g. when the cavity has a substantially right-angular configuration.
  • the invention is particularly utilizable with annular cavities, especially cavities adapted for forging gear wheels or the like from blanks produced by powder metallurgy.
  • the forging tool for forging annular blanks produced by powder metallurgy is illustrated in Fig. 1.
  • the lower die portion of the tool includes an annular matrix 1, a core 2 arranged therein, and a lower die 3 (see Fig. 2), these forming an annular cavity for the blank which is to be processed.
  • the too] further includes an annular upper die 4.
  • the tool parts are mutually displaceable in a manner known per se.
  • a lubricating device may be inserted between the upper die 4 and the matrix 1.
  • the device includes a carrier 10 which is displaceable, with the aid of some conventional drive means 32, to and from the illustrated position.
  • the carrier 10 has two arms 12,22 mounted for turning about mountings 11,21 which are kept coaxial with the forging tool by the carrier 10. At their free ends, each arm 12,22 carries a nozzle tube 13,23 which is terminated by a spray nozzle 14,24, adapted for directing a spray towards the side walls and bottom of the forming cavity, and to the lower surface of the upper die 4, respectively. Means 31 are arranged for swinging the arms 22,12 about their mountings.
  • the carrier 10, mountings 11,21 and arms 12,22 may all be hollow to allow the supply of a lubricant via the carrier to the nozzles 14.
  • the lubricant spray 15,25 departing from the nozzles 14,24 can either be formed directly by ejecting the lubricant at a relatively high pressure, or by ejecting the lubricant with the aid of compressed air.
  • the bearings 11,21 may be of the swivelling type.
  • the nozzles 14,24 are preferably disposed for having their orifices at a small distance above the upper surface of the matrix 1, and under the lower surface of the upper die 4, respectively.
  • the nozzles 14,24 are illustrated as directing a spray 15,25 in a direction parallel to the axis of the cavity, but it should be quite clear that the direction of the nozzles can deviate from this direction, and then preferably in the tangential direction of the annular cavity.
  • the invention has been described above in conjunction with one nozzle, but it should be clear that instead of a single nozzle, a nozzle unit comprising a plurality of jets may be utilized.
  • the impingement area of the spray is, for the mentioned reason, a fraction of the cavity area, and in the case of the annular cavity the fraction being for example the relationship between the radial width and the periphery of the cavity.
  • Lubrication of the upper die is normally not critical, but can be carried out with conventional means.
  • inventive apparatus has been illustrated also for the upper die, but then substantially solely for the sake of uniformity.
  • the nozzle may also be lowered into the cavity with the aid of suitable means.
  • the implementation of the nozzle may be adjusted to suit the configuration of the cavity, such as to give a spray depositing a uniform lubricant coating over the cavity, particularly transverse its longitudinal direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Forging (AREA)
EP84850045A 1983-03-14 1984-02-09 Verfahren und Vorrichtung zum Schmieren einer Form in einem Schmiedewerkzeug Withdrawn EP0119177A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8301375 1983-03-14
SE8301375A SE8301375L (sv) 1983-03-14 1983-03-14 Forfarande och anordning for smorjning av en formkavitet i ett smidesverktyg

Publications (2)

Publication Number Publication Date
EP0119177A2 true EP0119177A2 (de) 1984-09-19
EP0119177A3 EP0119177A3 (de) 1985-01-09

Family

ID=20350354

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84850045A Withdrawn EP0119177A3 (de) 1983-03-14 1984-02-09 Verfahren und Vorrichtung zum Schmieren einer Form in einem Schmiedewerkzeug

Country Status (3)

Country Link
EP (1) EP0119177A3 (de)
JP (1) JPS59178145A (de)
SE (1) SE8301375L (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995018595A1 (de) * 1994-01-04 1995-07-13 Voss Gunter M Verfahren zur herstellung von tabletten

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4824191B2 (ja) * 2001-04-24 2011-11-30 昭和電工株式会社 鍛造用金型への潤滑剤塗布用ノズル、潤滑剤塗布装置、潤滑剤塗布方法、鍛造装置および鍛造方法。
JP2008207252A (ja) * 2008-04-21 2008-09-11 Showa Denko Kk 鍛造方法、鍛造用金型および鍛造成形品
JP5867560B2 (ja) * 2014-09-08 2016-02-24 日本軽金属株式会社 熱間鍛造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2929564A (en) * 1956-12-17 1960-03-22 Columbus Automatic Lubrication Spraying device
DE1885115U (de) * 1963-04-02 1963-12-27 Wegerhoff H Alarm Werkzeug Schmiervorrichtung fuer die werkzeuge in schmiedepressen.
DE3039914C2 (de) * 1980-10-23 1983-01-27 Langenstein & Schemann Ag, 8630 Coburg Schmier/Ausblaseinrichtung einer Umformmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995018595A1 (de) * 1994-01-04 1995-07-13 Voss Gunter M Verfahren zur herstellung von tabletten

Also Published As

Publication number Publication date
SE8301375D0 (sv) 1983-03-14
JPS59178145A (ja) 1984-10-09
SE8301375L (sv) 1984-09-15
EP0119177A3 (de) 1985-01-09

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Effective date: 19850910

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Inventor name: BJOERK, URBAN

Inventor name: STROEMGREN, MATS