EP2580010A1 - Outil de compactage - Google Patents

Outil de compactage

Info

Publication number
EP2580010A1
EP2580010A1 EP11740804.7A EP11740804A EP2580010A1 EP 2580010 A1 EP2580010 A1 EP 2580010A1 EP 11740804 A EP11740804 A EP 11740804A EP 2580010 A1 EP2580010 A1 EP 2580010A1
Authority
EP
European Patent Office
Prior art keywords
die
component
punch
recess
compression
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.)
Granted
Application number
EP11740804.7A
Other languages
German (de)
English (en)
Other versions
EP2580010B1 (fr
Inventor
Christian Dumanski
Robert Spitaler
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.)
Miba Sinter Austria GmbH
Original Assignee
Miba Sinter Austria 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 Miba Sinter Austria GmbH filed Critical Miba Sinter Austria GmbH
Publication of EP2580010A1 publication Critical patent/EP2580010A1/fr
Application granted granted Critical
Publication of EP2580010B1 publication Critical patent/EP2580010B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B22F3/03—Press-moulding apparatus therefor
    • 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
    • B22F3/24—After-treatment of workpieces or articles

Definitions

  • the invention relates to a tool for compacting the surface of a powder metallurgically produced component, with a die and a punch, wherein in the die a
  • Recess is arranged, which extends from a first die opening to a second die opening, and having a wall surface for abutment of the component, and the punch has a punch length and a punch surface, wherein a
  • Inner diameter of the recess of the die from the first die opening to the second die opening is smaller or an outer diameter of the punch over the punch length is larger, and wherein on the wall surface of the die or on the
  • Stamping surface is arranged a compacting element, a method for compacting the surface of a powder metallurgy produced component, comprising a tool having a die and a punch, wherein the component is moved through the die or the punch through a recess of the component and is compacted on the surface ,
  • a powder metallurgical, manufactured component having a component body having at least one compressed side surface or at least one recess with at least one compressed wall surface.
  • the outer periphery of the sintered part is plastically and elastically deformed, whereby the surface is compacted and the sintered part receives its final dimension.
  • the distances between the die plates allow the sintered part to expand by expanding a portion of the elastic deformations after each die plate.
  • the sintered part undergoes intermediate relief after each die plate, as a result of which a compressive residual stress remaining after deformation in the sintered part is built up in stages.
  • a method for surface compacting a sintered part in which a sintered part in a die tool along an axis in a pressing direction through a plurality of die sections from a first die section to a first die section
  • Matrizenötechnische is moved into a last die portion, wherein a wall surface of each die portion forms at least one pressing surface against which one of a
  • Outer surface of the sintered part formed contact surface is pressed, and one, in a cross-section with respect to the axis, defined by the pressing surface inner contour corresponds at least approximately to an outer contour defined by the contact surface.
  • this WO-A2 describes a tool for carrying out this method.
  • the present invention is based on the object to provide an improved way to compact the surface of a powder metallurgy produced component.
  • Compression element relatively small compression levels can be achieved, whereby a material-friendly deformation is achieved, which is further supported by the impact of the component on the oblique Umformkante the compression element. Nevertheless, the tool itself is still relatively simple.
  • the die can consist of a single part, as well as the stamp.
  • Compression element but also allows a relaxation of the compacted component areas outside the compression zones, whereby a burr formation on the component due to the compression can be significantly reduced.
  • the burr formation can also be reduced by the force component acting in the circumferential direction of the component.
  • Tool-compacted components also show a reduction in noise in the application of the components, presumably due to the special surface topography created during and through compaction.
  • Another advantage lies in the fact that in the free spaces between the compression areas, ie in the relaxation zones, used forming oil can deposit, causing the tearing of the
  • Lubricating film can be better prevented during the deformation. It can thus reduce the stress on the tool and the oil consumption. As a result, the movement also has a longer service life.
  • a plurality of helical are distributed over the respective surfaces
  • Compression elements are arranged. It is thus not only a better or higher compression of the component achieved, but can thus be achieved in particular that a multi-point support is provided for the component in the tool so that tilting of the component during compression can be better avoided.
  • the plurality of compression elements are each offset by an equal angle value to each other, whereby these effects are enhanced.
  • the one or more thread-like compression element (s) has or have a thread pitch that varies over the length of the or the compression element (s). It is thus achieved that areas are created over the length of the compression section of the tool, which have a different compression effect on the component surface, ie areas with greater compression effect and areas the larger
  • the one or more compression element (s) may have a chamfer or a rounding, in order to avoid at least a high degree of wear on the tool at least as far as possible, or on the other hand, a "gentler" transition of the component of the
  • the inner diameter of the recess in the die can decrease linearly or the outside diameter of the punch increases linearly in the pressing direction. It is thus simplifies the production of the tool. In addition, it may also be possible
  • the end portion of the recess in the die or the punch may be cylindrical, which end portion may also be free of compression elements in order to achieve the straightening of the component.
  • FIG. 1 a die in a side view, cutaway top view;
  • Fig. 2 the die of Figure 1 in plan view. 3 shows a stamp in side view;
  • FIG. 6 shows a section of a further variant of the die in side view
  • FIG. 7 is a diagram of the surface roughness of a compacted with the inventive tool sintered component.
  • FIG. 1 and 2 show a longitudinal section through and a plan view of a die 1 for a tool for surface compaction of a component 2 by moving it along an axis 3 through the die 1.
  • This comprises a MatrizengrundMech 4, which has a recess 5, the extends from a first die opening 6 on a first die surface 7 to a second die opening 8 opposite the first die opening along the axis 3 on a second die surface 9 continuously through the die body 4 and whose cross section is adapted to the cross section of the component 2 to be compacted ,
  • the recess 5 has a wall surface 10 for abutment of a component surface 11 of the component 2.
  • the recess has an inner diameter 12 which, beginning at the first die opening 6, becomes smaller in the direction of the second die opening 8, as a result of which the recess 5 tapers along at least part of a pressing length 13 of the die 1 along the axis 3.
  • the component 2 consists of pressed and then sintered metal powder, so it is made by powder metallurgy, the methods and materials for producing such a sintered blank from the prior art are well known and therefore not explained in detail.
  • the component 2 is designed disc-shaped in the illustrated embodiment and has on the component surface 11 a diameter 14, which corresponds to the surface densification of a raw diameter 15 and after the surface compression to a smaller end diameter 16.
  • the compression element 17 On the wall surface 10 and projecting over this at least one compression element 17 is arranged.
  • the compression element 17 has a thread-like shape, thus extending from the region of the first die opening 6 to the region of the second die opening 8 in the form of a helical or spiral, therefore, can also be referred to as Umformspirale. It is thus generated with the compression element 17, an oblique Umformkante to compaction. Due to the gradient of the compression element 17, that is to say the forming spiral, a "traveling forming point" or "a traveling forming edge" results along the component circumference.
  • the compression element 17 need not necessarily be arranged beginning at the first die opening 6, but that an inlet region in the die 1 at the may be formed first die opening in which no compression element 17 is arranged to facilitate the insertion of the component 2 into the die.
  • an end portion 18 of the recess 5 of the die 1 may also be free of the compression element 17 or compression elements 17.
  • this end portion may have an inner cross section that corresponds to the outer contour of the finished compacted component 2, that is, for example, have a cylindrical cross-section, so as to allow the same in a final step of the compression of the surface of the component 2.
  • the compression element 17 extends on the wall surface 10 starting from the first die surface 7 to the second die surface 9.
  • the compression element 17 preferably extends continuously without interruption in the recess 5, but it is possible that this compression element 17 is divided into individual, slightly spaced compression member sections. As can be seen in Fig. 2 in dashed and dash-dotted lines, there is
  • a plurality of compression element 12 are arranged on the wall surface 10, so for example two, preferably three (as shown), or four, five, six, etc.
  • the compression elements 17 are preferably in the form of a multi-thread, ie For example, three-thread, arranged, the resulting "compaction passages" are in particular offset by a respective same angular value to each other, resulting by dividing 360 ° by the number of thread-like compression elements 17, so for example by 120 0 in the arrangement of three Compression elements 17.
  • the or the compression element (s) 17 are worked out of the wall surface 10 of the recess 5, that is integrally formed with the die 1.
  • the surface compression of the component 2 takes place by being introduced into the recess 5 through the first die opening 6 and subsequently moved as far as and through the second die opening 8, the component surface 11 of the component 2 being pressed against the compacting element or elements. 17 of the die 1 is pressed.
  • the direction of movement of the component 2 can also be reversed so that therefore the component 2 is not removed from the die 1 via the second die opening 8 but the first die opening 6.
  • the inner diameter 12 which is defined by the clear width between opposite or cooperating portions of the wall surface 10 of the recess 5, wherein the or the compression element (s) 17 is seen as part of the wall surface 10 and
  • the term inner diameter 12 is not to be understood as limited to circular cross sections, but also as a clear width between interacting press surface parts, which need not necessarily go through the axis 3 of the die 1.
  • the diameter 14 on the component 2 is not limited to radial directions.
  • the recess 5 preferably has an inner diameter 14 which is at least not smaller than the raw diameter 15 of the component in order to simplify the insertion of the component 2.
  • the movement of the sintered part 2 in the die tool 1 preferably takes place in a straight line along the axis 3 in a pressing direction 19 from the first die opening 6 to the second die opening 8, followed by the removal of the component 2 from the die 1, via the second die opening 8 or after Direction of movement reversal against the pressing direction 19 through the first die opening 6, for which purpose an ejector element can be arranged in the second die opening.
  • the rectilinear movement in the direction of the axis 3 can also be superimposed by a rotational movement, whereby the component 2 in the die 1 performs a screwing movement.
  • the component surface 11 also includes screw surfaces.
  • the movement of the component 2 takes place about a screw axis which coincides or is parallel to the axis 3, for example if the screw surface to be compacted on the component surface 11 is not arranged on the entire circumference of the component 2 and this is not rotationally symmetrical Basic body has.
  • the direction of movement of the component 2 in the die 1 can, as well as the speed of movement for optimizing the surface compression, have an arbitrary course, and e.g. also include a reversal of movement, stoppage of movement, very slow but also very fast movements. It is possible that the compression is carried out with at least two relative reversals of movement of the component 2 to the die 1, so the component 2 is moved, for example, down through the die 1, in the die 1, the component again a short distance against the original direction of movement is moved back and then moved within the die 1 after a new reversal of motion back in the original direction through the die 1.
  • this process can be repeated several times or the die 1 can be moved instead of and / or in addition to the component 2.
  • compressive stresses are generated.
  • the component surface 11 additionally experiences a sliding friction stress in the axial direction with rectilinear motion or in the axial and tangential direction with one screwing.
  • These stresses acting on the component surface 1 1 in the component 2 cause both an elastic and a plastic deformation of the component 2, wherein the plastic portion causes the permanent surface compression.
  • the powder metal particles joined together by pressing and subsequent sintering on so-called bridges are strongly pressed against each other and plastically deformed.
  • the existing between the powder metal particles after sintering pore-like cavities are thereby reduced in volume and increases the material density in this area.
  • the statements regarding the movement sequence also apply to the stamp.
  • the compression element 17 is not designed to extend over the entire inner circumference of the recess 5, but that a predeterminable portion of the wall surface 10 of the recess 5 in the direction of the axis 3 is free of compression elements 17. It is thus possible to produce components 2, after the movement of the component 2 during compression preferably takes place in the direction of the axis, which are surface-compacted only in a partial region.
  • components 2 which have a different degree of surface compression in different areas by the compression element 17 is formed over a portion of the pressing length 13 of the die 1 extending continuously over the circumference of the recess 5 or at least one further thread-like compression element 17 is arranged only in a partial region of the circumference of the recess 5 over the pressing length 13.
  • 17 have a different overall length at several compression elements.
  • a compacting member 17 may have a pitch selected from a range of 0.5 mm to 150 mm, more preferably selected from a range of 5 mm to 100 mm, or selected from a range of 20 mm to 50 mm.
  • a compression element 17 can be formed over its entire length with at least two different pitch angles, ie, for example, the pitch angle in the area of the first die opening 6 can be greater than in the area of the second die opening 8, so that in other words the "threads" or Compressing passages closer together over the length of the compression element 17.
  • Such a design of a compression element 17 can also be used in the arrangement of several compression elements 17.
  • the compression element (s) 17 may be in the form of a "left-hand thread” or a "right-hand thread”.
  • Fig. 3 shows a punch 20 for compressing the surface of a recess in a component 2 (not shown), for example a gear.
  • An end portion 24 of this mandrel can be carried out again without compression elements 17 in order to achieve the straightening of the surface-compressed component 2.
  • this end section preferably has a cross-section which corresponds to the cross-section of the finished compacted component 2, that is to say has a cylindrical shape, for example.
  • the die 1 according to the invention is also possible for the die 1 according to the invention to be used in combination with the stamp 20 according to the invention for the surface compression of a component 2 in order to compact both the inner component surface and the outer component surface 11 To reach work step.
  • the compression element (s) 17 may or may have different profile cross sections 25 to 33, for example a pointed profile, such as a pointed profile cross section 25, a rounded profile cross section 26, as shown by way of example in FIG conically over-turned profile cross-section 27, a saw profile, such as a pole side flat profile section 28 or equator formula flat profile section 29, a flat profile, such as a conically flattened profile section 30 or a rounded profile section 31, one, in particular from these profile sections 25 to 31, combinable Neten profile cross section 32 or a round profile cross section 33.
  • the or the Verdichtungseiementie) 17 may or may also be provided with the chamfer.
  • a flank 34 facing the component 2 when it is moved against the compacting element 17 can enclose a different angle with the wall surface 10 than an edge 35 facing away from the component in the direction of movement.
  • the facing flank 34 can be made steeper than the flank 34 facing flank 35, in order to simplify the "driving over" of the compression element 17 with the component 2 and thus to allow a tool sparing compaction.
  • the profile cross-section of the compression element 17 changes over its entire length, e.g. in the area of the first die opening 6 steeper, i. With a slight angle of inclination of the flanks 33, 34 inclined profile cross sections are formed against the wall surface 10, ie in areas with even less surface compression of the component 2, and in the region of the second die opening 8 flatter profile cross sections, i. with a larger inclination angle of the flanks 33, 34 inclined to the wall surface 10.
  • a transition region 36 between the wall surface 10 of the recess 5 of the die 1 and the punch surface 21 of the punch 20 and the compression belt or belts 17 can be rounded, as can be seen in FIGS. 5 and 6, the cutouts from embodiments of the die 1 in cross section.
  • the cross section of the recess 5 tapers conically from the first die opening 6 in the direction of the second die opening 8.
  • the wall surface 10 of the recess 5 the die 1 are formed between the protrusions formed by a compression element 17 with a convex or concave curvature, wherein also mixed forms with convexly curved portions and concave curved portions in a recess 5 are possible.
  • the inner diameter 12 (FIG. 2) of the recess to decrease progressively or degressively or with a combination thereof.
  • the remarks in this paragraph also apply to the punch 20, ie the punch surface 21.
  • the use of the die 1 and / or the stamp 20 for surface compacting produces a component 1 whose outer component surface 11 and / or inner surface of a recess at least partially exhibits a wave shape.
  • 7 shows an example of a course of the roughness depth on a completely compressed component 2 (FIG. 1).
  • the surface roughness in ⁇ and on the abscissa are the component height (in the pressing direction 19, as shown in Fig.l) plotted in ⁇ on the ordinate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Punching Or Piercing (AREA)

Abstract

L'invention concerne un outil pour le compactage de la surface d'un composant (2) fabriqué par la métallurgie des poudres, cet outil comportant une matrice (1) et un poinçon (20), un évidement (5) étant disposé dans la matrice (1), lequel s'étend depuis une première ouverture de matrice (6) jusqu'à une seconde ouverture de matrice (8) et qui présente une surface de paroi (10) pour l'appui du composant (2), et le poinçon (20) présentant une longueur de poinçon (23) et une surface de poinçon (21), un diamètre intérieur (12) de la cavité (5) de la matrice (1) étant réduit en allant de la première ouverture de matrice (6) en direction de la seconde ouverture de matrice (8) ou bien un diamètre extérieur (22) du poinçon (20) devenant plus grand sur la longueur de poinçon (23), et un élément de compactage (17) étant disposé sur la surface de paroi (10) de la matrice (1) ou sur la face de poinçon (21). L'élément de compactage (17) est conçu avec un tracé en forme de filetage.
EP11740804.7A 2010-06-10 2011-06-09 Outil de compactage Not-in-force EP2580010B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0094710A AT509588B1 (de) 2010-06-10 2010-06-10 Verdichtungswerkzeug
PCT/AT2011/000260 WO2011153574A1 (fr) 2010-06-10 2011-06-09 Outil de compactage

Publications (2)

Publication Number Publication Date
EP2580010A1 true EP2580010A1 (fr) 2013-04-17
EP2580010B1 EP2580010B1 (fr) 2016-10-12

Family

ID=44501636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11740804.7A Not-in-force EP2580010B1 (fr) 2010-06-10 2011-06-09 Outil de compactage

Country Status (6)

Country Link
US (1) US9101980B2 (fr)
EP (1) EP2580010B1 (fr)
CN (1) CN103079731B (fr)
AT (1) AT509588B1 (fr)
BR (1) BR112012031447A2 (fr)
WO (1) WO2011153574A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT517989B1 (de) * 2015-12-14 2019-01-15 Miba Sinter Austria Gmbh Verfahren zum Oberflächenverdichten und Kalibrieren eines Sinterbauteils
CN107282682A (zh) * 2017-08-17 2017-10-24 西京学院 一种变截面旋挤模具及其使用方法
CN110899445B (zh) * 2019-12-17 2021-08-13 浙江普兴电子科技有限公司 采用旋压工艺制备正弦型可展开密封结构的模具及方法
US11707786B2 (en) 2020-04-17 2023-07-25 PMG Indiana LLC Apparatus and method for internal surface densification of powder metal articles
CN114653770B (zh) * 2022-03-28 2024-02-13 太原科技大学 一种镁合金高性能板材的螺旋变径-连续扭转挤压模具

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Publication number Priority date Publication date Assignee Title
US3805360A (en) 1973-01-29 1974-04-23 Motor Wheel Corp Method and apparatus for sizing brake drum rings
US5325698A (en) * 1992-09-30 1994-07-05 Ford Motor Company Stepped extrusion die assembly
WO1998016338A1 (fr) * 1996-10-15 1998-04-23 Zenith Sintered Products, Inc. Densification d'une surface de composants de machine realisee par metallurgie des poudres
US5996229A (en) * 1998-09-25 1999-12-07 Yang; Tsung-Hsun Method and mold die for forming a spiral bevel gear from metal powders
US6168754B1 (en) * 1999-02-17 2001-01-02 Federal-Mogul World Wide, Inc. Method and apparatus for densifying powder metal preforms
US6899846B2 (en) * 2003-01-14 2005-05-31 Sinterstahl Corp.-Powertrain Method of producing surface densified metal articles
US7025929B2 (en) * 2004-04-08 2006-04-11 Pmg Ohio Corp. Method and apparatus for densifying powder metal gears
AT504081B1 (de) * 2006-09-04 2008-11-15 Miba Sinter Austria Gmbh Verfahren zur oberflächenverdichtung eines sinterteils
AT505947B1 (de) 2007-11-14 2016-04-15 Miba Sinter Austria Gmbh Verdichtungswerkzeug

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011153574A1 *

Also Published As

Publication number Publication date
AT509588A4 (de) 2011-10-15
CN103079731A (zh) 2013-05-01
US9101980B2 (en) 2015-08-11
BR112012031447A2 (pt) 2016-12-13
WO2011153574A1 (fr) 2011-12-15
EP2580010B1 (fr) 2016-10-12
AT509588B1 (de) 2011-10-15
US20130129558A1 (en) 2013-05-23
CN103079731B (zh) 2015-06-24

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