EP0219019A2 - Installation pour le laminage transversal plastique d'ébauches métalliques frittées poreuses à symétrie de rotation - Google Patents

Installation pour le laminage transversal plastique d'ébauches métalliques frittées poreuses à symétrie de rotation Download PDF

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Publication number
EP0219019A2
EP0219019A2 EP86113742A EP86113742A EP0219019A2 EP 0219019 A2 EP0219019 A2 EP 0219019A2 EP 86113742 A EP86113742 A EP 86113742A EP 86113742 A EP86113742 A EP 86113742A EP 0219019 A2 EP0219019 A2 EP 0219019A2
Authority
EP
European Patent Office
Prior art keywords
sintered metal
porous sintered
working gap
tool
metal parts
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Withdrawn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
EP86113742A
Other languages
German (de)
English (en)
Other versions
EP0219019A3 (fr
Inventor
Paul Dr.-Ing. Beiss
Hanns Neumaier
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.)
Sintermetallwerk Krebsoege GmbH
Original Assignee
Sintermetallwerk Krebsoege GmbH
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 Sintermetallwerk Krebsoege GmbH filed Critical Sintermetallwerk Krebsoege GmbH
Publication of EP0219019A2 publication Critical patent/EP0219019A2/fr
Publication of EP0219019A3 publication Critical patent/EP0219019A3/fr
Withdrawn legal-status Critical Current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
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/18—Making articles shaped as bodies of revolution cylinders, e.g. rolled transversely cross-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H7/00—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons
    • B21H7/18—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons grooved pins; Rolling grooves, e.g. oil grooves, in articles
    • 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
    • B22F3/12—Both compacting and sintering
    • B22F3/16—Both compacting and sintering in successive or repeated steps
    • 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
    • B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/06—Making by means of profiled members other than rolls, e.g. reciprocating flat dies or jaws, moved longitudinally or curvilinearly with respect to each other
    • B21H3/065—Planetary thread rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H5/00—Making gear wheels, racks, spline shafts or worms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H7/00—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons
    • B21H7/18—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons grooved pins; Rolling grooves, e.g. oil grooves, in articles
    • B21H7/182—Rolling annular grooves

Definitions

  • the invention relates to a device for upsetting porous, rotationally symmetrical sintered metal parts with tools for plastically compressing one or more porous sintered metal parts.
  • porous sintered metal parts are made after sintering in closed non-undercut tools, which essentially consist of lower punches and dies and if necessary a mandrel or a plurality of mandrels and upper punches are formed, axially compressed by a few percent decrease in height.
  • This procedure is called "calibration" in powder metallurgy.
  • the material of the sintered metal part attaches to the shaping tool surfaces by plastic deformation.
  • an increase in density is achieved in this way, which is associated with an improvement in mechanical strength. If you calibrate at room temperature, the strength also increases due to strain hardening. About 85% of porous sintered metal parts are currently manufactured in Europe using this process.
  • a calibration process e.g. B. for dimensional reasons, not required.
  • the invention has for its object to improve a device according to the preamble of claim 1 to the extent that the shaping options for rotationally symmetrical porous sintered metal parts can be significantly improved while at the same time significantly increased productivity.
  • porous sintered metal parts are calibrated in a conventional manner, there is a preferred compression and work hardening of the end faces, which - similar to powder pressing - is explained by the axial friction of the part to be formed on the tool walls. Since the method according to the invention is an essentially radial forming process, the compression and strain hardening do not occur so much on the end faces but much more on the outer circumference. This is particularly noticeable in the case of filigree rollable contours for the transmission of peripheral forces, e.g. B. on gears.
  • the method according to the invention can be carried out extremely quickly, so that throughput increases by more than a factor of 10 are achieved.
  • undercuts on the outer circumference, e.g. B. grooves, grooves, corrugations, teeth or the like.
  • the device proposed according to the invention requires a relatively simple construction in order to be able to machine rotationally symmetrical bodies using the method according to the invention.
  • a sector-shaped, concave tool part is sufficient, to which a driven, roller-shaped tool part of circular cross-sectional shape is arranged at the gap distance, the lateral surface of which forms the counter surface for the concave tool part, so that the rotationally symmetrical body in the manner described and Let way edit.
  • temperatures in the range of transformation plasticity in the ⁇ - ⁇ transformation are preferred, which, depending on the chemical composition of the steel, is between 723 ° C. and 911 ° C. Temperatures below 600 ° C have proven successful for bronze parts, while temperatures between 450 ° C and 400 ° C appear optimal for aluminum.
  • the forming can take place under protective gas. This largely prevents oxidation of the porous sintered metal parts. At the temperatures mentioned, measurable scale layers already form on steel in air, which not only represent a visual impairment, but also leave a pitted, usually unacceptable surface structure after the radial compression.
  • Claim 2 describes an advantageous embodiment in which bodies provided with undercuts, for example with grooves, can be calibrated.
  • the plates are finished separately from each other in order to achieve sufficient geometric accuracy of the working gap and especially the groove base.
  • one-sided notches, grooves or other axially undercut contours are required, which cannot be achieved with conventional powder metallurgy manufacturing technology without machining. In this case, it is usually sufficient to maintain a single spacing for the undercut, while the free end of the porous sintered metal part is of no importance for the function in its axial extent.
  • the axial limitation of the height increase on only one side of the porous sintered metal part makes tool manufacture easier and cheaper in the cases mentioned.
  • Claim 5 aims in a similar direction. If both tool parts contain a fully developed tooth profile in the base of the grooves with teeth of the same width, height and profile, the basic law of toothing is not fulfilled when inserting a workpiece in the form of a rotationally symmetrical porous sintered metal part, since in a tapered working gap, the condition of constant distance between the centers of rotation (center distance) can never be met. Therefore, the flanks of a toothing embossed on the circumference of the porous sintered metal part are damaged during rolling in the tapered working gap, and the tooth tip tears open with less ductile materials. These difficulties can be avoided with the tool construction and the positioned feeding of the porous, rotationally symmetrical sintered metal parts into the working gap.
  • the device according to claim 9 avoids quality-reducing impressions of the tool edges on the circumference of the porous, rotationally symmetrical sintered metal part.
  • FIG. 1 shows a device according to the prior art for delimiting methods according to the invention.
  • a workpiece 2 made of porous sintered metal material in a die 3 is calibrated against a lower punch 4 with a central mandrel 5 by an upper punch 1. With such a front direction is only a discontinuous procedure possible.
  • FIG. 2 the movement sequence in an exemplary method according to the invention is shown schematically in FIG. 2.
  • the reference numeral 6 denotes a concave tool part, to which a motor-driven gap gap 7 ; driven convex tool part 8 is assigned that in the embodiment shown is circular in cross section and accordingly has an outer cylindrical surface 9.
  • the direction of rotation of the convex tool part 8 is indicated by the arrow and the letter X.
  • Porous sintered metal parts 10 are introduced via a suitable feed 11 into the working gap 7 tapering in the direction of rotation X, the workpieces 10 being set in rotation by frictional forces and forced by the driven tool part 8 through the working gap 7.
  • the concave tool part 6 and / or the convex tool part 8 are designed to be positionable and, in order to adjust the width of the working gap 7, can be designed to be movable with the required accuracy and can be locked in the respective position.
  • the porous sintered metal parts 10 take on the contour of the working surfaces 9 and 17 of the tool parts 6 and 8 while reducing their volume on their outer diameter.
  • the sintered metal parts 10 which have undergone compression during the forming, are stripped from the driven convex tool part 8 by a scraper 12, if necessary, and conveyed in a suitable manner in the Y direction.
  • the removal device is not shown.
  • conventional conveying devices e.g. Chutes, conveyor belts or the like are used.
  • the two tool parts 6 and 8 are advantageously designed in such a way that the height in the working gap 7 is limited. This is indicated in FIGS. 3 and 4 by the fact that the working surfaces 9 and 17, from which the radial forming pressure is exerted on the porous sintered metal part 10, each in a groove 13 or 14 of the fixed concave and the driven convex tool part 6 or 8 are incorporated.
  • the self-centering of the porous sintered metal part 10 in the working gap suffices Fig. 3 from. If the above conditions do not apply, the workpieces 10 must be kept in the working gap 7. For workpieces with a central bore 15 (FIG. 3), this can be done by threading onto a mandrel 16 (FIG. 4), the mandrel 16 also being guided through the working gap 7. This also prevents the workpieces 10 from tumbling. This is indicated, for example, in FIG. 4.
  • the porous sintered metal part 10 can also be held between rotating dies which exert axial pressure or combinations of dies and thorns (not shown).
  • cage guides e.g. for tall, slim parts that are only to be formed on one side.
  • the concave fixed tool part 6 at the inlet must be dimensioned larger both in height and in the width of the working gap 7 than the height and the initial diameter of the porous sintered metal part 10 before the forming process.
  • the transition from the inlet to the final dimension takes place in the Invention according to the process continuously.
  • the working gap 7 in the concave fixed tool part 6 opens gradually and gently in the working direction X (not shown). This prevents the edge of the fixed concave tool part 6 from being pressed radially into the surface of the porous sintered metal part 10.
  • Fig. 5 shows a self-lubricating spherical bearing.
  • the dome contour can only be hinted at in powder pressing, since the press rams would have to end infinitely sharply to form a dome. This ideal state cannot even be approximately achieved because the risk of stamp breaks increases with increasing wall thickness.
  • the method according to the invention makes it possible to provide the calotte with high accuracy with sintered metal bodies produced from porous sintered metal material and only preformed with the indicated spherical shape (not shown) or with the cylindrical shape chamfered on the end face. In this case, because of the axial height limitation according to FIG. 3 and 4 a tighter height tolerance than with conventional calibration.
  • the circumferential surface of the porous sintered metal part 10 can be structured during the rolling movement in the working gap 7, e.g. with knurls, cords, radial grooves and so on.
  • Fig. 8 shows an embodiment with diameter reductions over the entire part height, e.g. to correct differences in diameter after sintering within a batch, to improve the surface quality after sintering, or to work-harden the peripheral surface.
  • a special form of contouring the circumferential surfaces of rotationally symmetrical porous sintered metal bodies 10 is toothing.
  • the method according to the invention allows toothing to be formed from round blanks, or existing toothing preformed by powder presses to achieve better mechanical strength properties of the toothing (FIG. 5).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Powder Metallurgy (AREA)
EP86113742A 1985-10-10 1986-10-03 Installation pour le laminage transversal plastique d'ébauches métalliques frittées poreuses à symétrie de rotation Withdrawn EP0219019A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3536154 1985-10-10
DE19853536154 DE3536154C1 (de) 1985-10-10 1985-10-10 Vorrichtung zum plastischen Stauchen poroeser rotationssymmetrischer Sintermetallteile

Publications (2)

Publication Number Publication Date
EP0219019A2 true EP0219019A2 (fr) 1987-04-22
EP0219019A3 EP0219019A3 (fr) 1988-08-03

Family

ID=6283250

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86113742A Withdrawn EP0219019A3 (fr) 1985-10-10 1986-10-03 Installation pour le laminage transversal plastique d'ébauches métalliques frittées poreuses à symétrie de rotation

Country Status (4)

Country Link
EP (1) EP0219019A3 (fr)
JP (1) JPS62167805A (fr)
DD (1) DD249652A5 (fr)
DE (1) DE3536154C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0559097A3 (en) * 1992-02-28 1993-09-29 Mepura Metallpulvergesellschaft Mbh Process for preparing metallic foams
ITRM20080391A1 (it) * 2008-07-21 2010-01-22 Cofren Srl Procedimento per la fabbricazione di pattini di attrito per freni, in particolare per freni per veicoli.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE549425C (de) * 1930-07-23 1932-04-27 Winkelhofer & Soehne Joh Verfahren und Vorrichtung zum Walzen von abgesetzten Stiften aus Drahtstuecken, besonders fuer Treibketten
BE647252A (fr) * 1963-05-01 1964-08-17
FR1447846A (fr) * 1965-09-27 1966-07-29 Rotary Profile Anstalt Procédé et appareil de profilage de pièces cylindriques ou sensiblement cylindriques et produits obtenus
JPS5921247B2 (ja) * 1977-09-29 1984-05-18 三菱マテリアル株式会社 焼結体の面取り装置
GB2132121B (en) * 1982-12-15 1986-02-12 Bakony Fem Elektromoskeszulek Forming metallic tubular connectors
DE3325037C1 (de) * 1983-07-11 1984-07-12 Sintermetallwerk Krebsöge GmbH, 5608 Radevormwald Mit wenigstens einer Verzahnung versehener Sintermetallkoerper

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0559097A3 (en) * 1992-02-28 1993-09-29 Mepura Metallpulvergesellschaft Mbh Process for preparing metallic foams
US5393485A (en) * 1992-02-28 1995-02-28 Mepura Metallpulvergesellschaft M.G.H. Process for the production of foamable metal elements
ITRM20080391A1 (it) * 2008-07-21 2010-01-22 Cofren Srl Procedimento per la fabbricazione di pattini di attrito per freni, in particolare per freni per veicoli.
EP2149415A1 (fr) * 2008-07-21 2010-02-03 Cofren S.r.L. Procédé pour la fabrication des plaquettes de frein, en particulier pour des véhicules ferroviaires

Also Published As

Publication number Publication date
EP0219019A3 (fr) 1988-08-03
DD249652A5 (de) 1987-09-16
JPS62167805A (ja) 1987-07-24
DE3536154C1 (de) 1987-02-05

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Inventor name: BEISS, PAUL, DR.-ING.

Inventor name: NEUMAIER, HANNS