EP3349926B1 - Presse pour pièce frittée et son procédé - Google Patents

Presse pour pièce frittée et son procédé Download PDF

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Publication number
EP3349926B1
EP3349926B1 EP16766550.4A EP16766550A EP3349926B1 EP 3349926 B1 EP3349926 B1 EP 3349926B1 EP 16766550 A EP16766550 A EP 16766550A EP 3349926 B1 EP3349926 B1 EP 3349926B1
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EP
European Patent Office
Prior art keywords
punch
head piece
press
asymmetrical
stamp
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.)
Active
Application number
EP16766550.4A
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German (de)
English (en)
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EP3349926A1 (fr
Inventor
Rainer Schmitt
Robert Maassen
Eberhard Ernst
Hasim Tekines
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.)
GKN Powder Metallurgy Engineering GmbH
Original Assignee
GKN Sinter Metals Engineering GmbH
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Publication of EP3349926A1 publication Critical patent/EP3349926A1/fr
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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
    • 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
    • B22F3/003—Apparatus, e.g. furnaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/005—Control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/027—Particular press methods or systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/026—Mounting of dies, platens or press rams
    • 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
    • B22F2003/033—Press-moulding apparatus therefor with multiple punches working in the same direction

Definitions

  • the present invention relates to a stamping tool of a sintering press with at least one upper stamp and one lower stamp, a stamp of the stamping tool for such a sintering press and a manufacturing method of a green body using the proposed sintering press with stamping tool.
  • Green compacts can be produced from a powder material by means of sintering presses, the green compacts later being sintered. Ceramic powder and / or metal powder can be used as powder material. Green compacts are manufactured in order to produce a wide variety of components. These can be symmetrical, in particular rotationally symmetrical components, but also asymmetrical components. However, the latter is associated with greater effort.
  • a sintering press with lower punches and upper punches is known, the head pieces of which are designed symmetrically to an axial axis of the sintering press.
  • JP 2014-100738 A JP 2014-001429 A and JP 2010-031331 A Sintering presses are known, in which at least lower punches with asymmetrically designed head pieces are provided for the production of asymmetrical green compacts.
  • the object of the present invention is to create a stamping tool of a sintering press with stamps with which even more complicated geometries, in particular asymmetrical geometries with very high pressing forces, can be produced.
  • a punching tool of a sintering press is proposed, with at least one lower punch and one upper punch, a first punch of the upper punch and / or lower punch having a head piece that is asymmetrical to an axial axis of the punch press, the first punch moving from the head piece to one Has base-widening geometry, which is also asymmetrical to the axial axis of the stamp press.
  • the asymmetrical geometry between the head piece and the foot piece is a stiffening of the first punch, which, adapted to the asymmetry of the head piece, serves to absorb a tilting moment on the first punch.
  • the first punch between the head piece and foot piece has a widening hollow structure that is at the same height has a different material thickness along a perpendicular cross section to the axial axis of the stamp press.
  • the first stamp is a composite stamp with a head piece, middle part, lower part and foot piece.
  • One embodiment provides that the first punch can be rotated, preferably for a play compensation in the tool.
  • first punch and a second punch can be moved into one another, the first and the second punch each having a head piece which is asymmetrical to the axial axis of the sintering press, the first and the second punch each being different from the head piece have a widening geometry to the foot piece, which are also asymmetrical to the axial axis of the sinter press.
  • a stamp of an above stamping tool is proposed, the stamp being used in a sintering press, characterized in that the stamp is from the head piece to the foot piece has an asymmetrical extension to an axial axis of the punch.
  • a method for compressing at least one powdery material in a sinter press into a green body is proposed, with an insertion of upper punches and lower punches into a die, with filling the die with the powdery material and with pressing the powdery material, whereby a green body to be sintered later is formed, which is given a geometry which is asymmetrical with respect to an axial axis of the sintering press by means of a stamping tool as described above or below, in which an asymmetrical extension from the head piece to the foot piece of a stamp is used, a lateral offset of this stamp to one Compensate the axial axis of the sinter press when pressing.
  • the stamps of the stamping tool are preferably released in a coordinated manner when they leave the die, without a compensation control or compensation regulation on the sintering press being used to compensate for differences between individual relaxation processes when the stamps are moved away from the green compact.
  • At least the stamp of the stamping tool which runs asymmetrically with respect to an axial axis of the sintering press, is composed of several individual pieces before the pressing and is installed in the sintering press.
  • a sinter press with at least one upper punch and one lower punch is proposed, with a powder reservoir for filling a die of the sinter press with a sinterable powder material and with a die for Production of a green compact using the powder material from the powder storage.
  • a first stamp, the upper stamp and / or lower stamp has a head piece off-center and asymmetrical to an axial axis of the sintering press. The head piece can be moved without a guide inside the die along an outer die wall, a mandrel and / or along an adjacent punch in the die.
  • the first stamp preferably has at least in a section between the head piece and the foot piece Over the entire area between the head piece and foot piece, an asymmetrical, in particular a non-rotationally symmetrical shape, which at least reduces radial tilting of the punch and longitudinal grinding of the head piece on an adjacent outer surface in the die when entering and exiting it, during a pressing process in the production of the green compact , especially prevented.
  • the asymmetry of the head piece can result, for example, from the fact that a green compact is to be formed which, for example, is not rotationally symmetrical everywhere.
  • a region of the punch which is arranged in the die during pressing can be arranged off-center and also asymmetrically to the axial axis.
  • a stamp can also be used which has several areas within the die in connection with the powder to be pressed, the areas differing from one another. Different heights, different surface geometries or different shapes can lead to asymmetry in relation to the axial axis. The following has now been found: Due to the eccentricity and the asymmetry with respect to the axial axis, a bending moment is generated in the stamp when it exerts a pressing force on the powder material.
  • the bending moment has resulted in a friction along the head piece with the adjacent die, a mandrel or another punch. Friction, for example on a mandrel, is reduced in that the head piece no longer has a radially acting tendency to tilt due to the asymmetrical design of the stamp geometry between the head piece and the foot piece. In the past, this tendency to tilt has led to greater wear of such punches with eccentrically arranged punch heads than is the case with conventional rotationally symmetrical punches. Now, however, it has been possible to counteract this higher wear by designing the stamp in such a way that the bending moment is supported in such a way that bending deformation is reduced or at least so far absorbed in the stamp itself is that there is no or only very little bending deformation.
  • the geometry of the stamp is also designed asymmetrically in order to counteract the asymmetry of the head piece.
  • This asymmetry can be achieved, for example, by material openings in a wall, by omitting material in a wall, by struts in place or supporting wall structures, as well as by other measures having the same effect.
  • the asymmetrical shape has an asymmetrical wall, in particular the first stamp has a different thickness from opposite sides of the wall.
  • a deviation from a rotational symmetry to the axial axis of the sintering press is to be regarded as asymmetrical in the area between the head piece and the foot piece.
  • the asymmetry may include a different shape from opposite areas of the shape.
  • Another material can also be used, an additional material or an omission of material.
  • an asymmetry can be achieved through different wall thicknesses, through different designs, through openings, through struts, through the geometric design such as conical, bell-shaped or the like.
  • a truss structure can also be used, for example, to create a connection from the foot piece to the head piece.
  • a bending compensation is preferably created in the stamp itself. This can counteract, for example, bending the head piece or the punch in one direction.
  • a form of asymmetry is achieved, for example, by a combination of an oblique transition from a cylindrical ring shape to a tapered ring shape with respect to the axial axis of the sintering press, when the punch slims down from the foot piece to the head piece.
  • the foot piece here, as in other configurations, is arranged symmetrically, preferably rotationally symmetrically, with respect to the axial axis of the sinter press, preferably with a foot plane, for example, which runs perpendicular to the axial axis of the sinter press and is seated directly on an adapter of the sinter press.
  • Such a stamp thus has a symmetrical foot piece and an asymmetrical head piece, the transition itself compensating for bending forces in the stamp itself.
  • the transition from the cylindrical ring via, for example, an egg-shaped or elliptical-shaped slimmering ring shape to a preferably conical ring shape also allows the associated wall to be adapted, in particular to be designed asymmetrically, so that bending forces or bending moments can be compensated for.
  • a tool with a first punch which has a symmetrical foot piece and an asymmetrical head piece, preferably produces a green compact that has an overall center of gravity on the axial axis of the sintering press.
  • the sinter press has one or more punches which can be moved into one another.
  • Such presses, as well as stamps, are preferably designed in a way that is not yet published DE 10 2014 003 726 the applicant entitled "Press for the production of dimensionally accurate green compacts and methods for the production", to which full reference is made in the context of the disclosure in this regard.
  • Possibilities for producing stamps arise from those that have not yet been published DE 10 2015 01784 and DE 10 2015 01785 forth. These are also referred to in full in the context of the disclosure with regard to the manufacture, but also with regard to the design of the stamp.
  • the asymmetrical wall is a wall provided with struts.
  • an area of the wall can receive additional support, in particular as stiffening.
  • the wall can also be replaced in some areas by one or more struts.
  • An asymmetrical region between the head piece and foot piece is preferably arranged approximately opposite to an asymmetrically protruding end of the head piece.
  • a transition from one geometric shape to another geometric shape is oblique with respect to the axial axis of the sintering press along the circumference.
  • an adaptation of the geometric shape to the asymmetrical end of the head piece is arranged rotated by approximately 180 °.
  • a further embodiment provides, for example, that an adaptation of the geometric shape is split up, so to speak.
  • the bending stress can be used, for example, to check whether the design of the punch meets the requirement profile enough.
  • Cartesian coordinate system is particularly useful for an area of the head piece that has not yet been transformed into a round, in particular circular shape, but rather has an angular geometry.
  • an orthogonal or also a cylinder coordinate system is preferably used for the calculation.
  • a corresponding transformation can then be used to create transitions from one geometric shape to another geometric shape.
  • the tensor calculation enables first describe the state of stress independently of a specific coordinate system and only adapt the component equations to the geometric properties of the body after deriving the respective calculation method, for example in cylindrical coordinates or spherical coordinates.
  • the use of a distortion tensor, i.e. a tensor of the second stage, which describes the ratio of the instantaneous configuration to the initial configuration in the deformation of continuous bodies and thus changes in the mutual relationship of the material elements, is preferably supported by the fact that a speed with which the tension is applied is also supported , is taken into account.
  • the distortion speed formed from the derivation of the distortion tensor, allows in particular to be able to take into account a different material behavior.
  • a change in the external shape of the stamp in the form of, for example, stretching, compression, shear or other means can thus also be estimated in this way and the geometry of the stamp can be adjusted accordingly until a bend in the area of the die and in particular in the area of the head piece under compressive force is excluded. It can also be determined here at which punch speed the headpiece preferably enters or brakes the die. For series production, it is therefore important on the one hand to adhere to a predeterminable minimum speed and thus cycle time, and on the other hand to find the least possible bending influence.
  • the first stamp can be moved into a second stamp, the second stamp likewise having an asymmetrical shape between the head piece and foot piece.
  • the second punch can also be arranged non-rotationally symmetrical with respect to the sinter press axis.
  • At least the first stamp is composed of different parts. This makes it possible, for example, to use different materials with different moduli of elasticity and to adapt their distribution or arrangement in the punch to a desired bending moment compensation. In this way, different manufacturing processes can also be used for different parts of the stamp, for example because these manufacturing processes allow different levels of precision and different parts of the stamp also require different levels of accuracy.
  • a calculation method for the design of a pressing tool of a sintering press is proposed, preferably for the production of metallic green compacts, whereby for a first stamp the Press tool, which has a head piece off-center and asymmetrical to an axial axis of the sintering press, a bend is calculated, which occurs when a force is applied, as well as when a force is discharged during a pressing process of a green body in the sintering press, and a stiffness of the first punch by adapting one Asymmetry of a shape of the first punch between the head piece and foot piece is adapted thereto, it being checked whether a compensation of an axial tilting moment on the first punch, caused by the eccentricity of the head piece, is improved by the adjustment of the asymmetry of the shape Has.
  • the asymmetry that is to be set can be determined using a catalog using various measures, as have already been described above. It is possible to start with a basic configuration. Various measures can then be used in a first draft and then evaluated against one another. There is also the possibility to set a requirement for measures to be combined with one another. On the basis of this specification, a check can then be carried out using a computer-based calculation program with regard to the compensation of the applied pressing pressure by the modeled stamp. If you notice that the model of the stamp does not yet show the results that can be specified in all areas, there is, for example, the possibility of further adjustment. This can be done using a corresponding algorithm, which can be set at least to the extent that it contains specifications as to which measure or measures should be used for further adaptation.
  • a further embodiment provides that a boundary condition is set, according to which the punch reacts under press load without shifting in a tilting direction.
  • a boundary condition is set, according to which the punch reacts under press load without shifting in a tilting direction.
  • the stamp remains rigid. It can also be specified that this has a uniform deflection in the axial direction.
  • a topology optimization is carried out on the first stamp, it being checked by means of at least one optimization algorithm in a predeterminable design space, by means of which material omission, a behavior of the stamp under press force complies with the predeterminable boundary parameters, the design space being set such that it is one from the head piece to the foot piece widening shape of the first stamp.
  • the material omission is preceded or followed by one or more thickened materials.
  • the topology optimization can be left for this, material can be applied using CAD and the topology optimization can be started again.
  • the method uses a modular system from which various parts of a stamp can be removed and assembled as a module are, the respective module connecting different geometries, different materials and different manufacturing processes.
  • a first punch is preferably proposed for a sintering press, the first punch having an asymmetrical shape in an area between the head piece and foot piece has, with a head piece that is eccentric and asymmetrical to an axial axis of the sintering press.
  • a first stamp can have one or more features as described above or in connection with the sintering press.
  • the first punch can preferably be moved into one another with a second punch, which likewise has a head piece which is off-center and asymmetrical to an axial axis of the sintering press.
  • a method for compressing at least one powdery material in a sinter press to a green body to be sintered is proposed, with a retraction of upper punches and stamping into a die, with filling the die with the powdery material and with pressing the powdery material, whereby a green body is formed which is asymmetrical with respect to an axial axis of the sintering press by means of a first stamp, the first stamp having an asymmetrical shape Has wall and moves past the die without contact when entering and exiting the die.
  • This process avoids grinding, in particular lateral friction, during the process in the die, particularly when a pressing pressure is applied.
  • a balancing of an effective one is preferred Bending moment, due to the asymmetrical loading along the axial axis, due to the eccentric arrangement of the head piece, due to the construction of the first stamp, having the asymmetrical wall. The compensation of the bending moment takes place in the stamp itself without any bending, lateral inclination or any other deformation that leads to rubbing of the head piece on an adjacent surface.
  • Fig. 1 shows an oblique view of a section of a sintering press 12 with a stamping tool 36 with two stamps (a first stamp 1 and a second stamp 2), the head pieces (first head piece 3 and second head piece 4) of which can be moved in a die 5.
  • a green compact 7 can be formed from powder in the die 5.
  • the die 5 has an outer die wall 30 within which the green body 7 can be formed, the respective head piece 3, 4 being able to act on an end face 35 of the green body 7.
  • the two head pieces 3, 4 are each designed asymmetrically to an axial axis 6 of the sintering press 12 and are arranged eccentrically to the axial axis 6.
  • the first stamp 1 represents an upper stamp 28 and the second stamp 2 a lower stamp 29.
  • the first stamp 1 can be moved along a first movement axis 33, the second stamp 2 along a second movement axis 34.
  • a powder storage 31 for filling the die 5 of the sintering press 12 with a sinterable powder material 32 from which the green compact 7 can be formed is also shown schematically.
  • the green compact 7, which in the exemplary embodiment shown has a shape that is not rotationally symmetrical with respect to the axial axis 6, can be relieved of pressure after the action of the pressing force via the punches 1, 2 in such a way that crack formation in the green compact 7 is prevented. Therefore, the respective geometry of the first punch 1 and the second punch 2 is preferably designed such that not only an internal compensation of a bending moment can take place. Rather, both punches 1, 2 are preferably designed such that their elastic behavior when relieved of the pressing force is the same.
  • both stamps 1, 2 are relieved of pressure, this can lead to a uniform Relief of the green body 7 come over the entire end face 35 of the green body 7. This can prevent the occurrence of uneven tensions and thus possibly unevenly distributed shear forces which can lead to shear in the material of the green compact 7 and thus to crack formation in the green compact 7.
  • the first stamp 1 can be moved into the second stamp 2.
  • Both punches 1, 2 each have a conical section (first conical section 13 and second conical section 14) on a respective foot piece (first foot piece 17 and second foot piece 18) and a straight section (first straight section 15 and second straight section 16) the respective head piece 3, 4.
  • the asymmetry described above is realized by the presence of the conical sections 13, 14 and the straight sections 15, 16.
  • This asymmetry is formed by a combination of a cylindrical ring shape and a conical ring shape.
  • the cylindrical ring shape is realized here by the straight sections 15, 16.
  • the conical ring shape is realized here by the conical sections 13, 14. There is a transition between conical sections 13, 14 and straight sections 15, 16.
  • the respective stamp 1, 2 is slimmed down from the respective foot piece 17, 18 to the respective head piece 3, 4.
  • the designation foot piece 17, 18 is used here synonymously with the term “stamp foot”, which is also common, and the designation head piece 3, 4 used synonymously with the term “stamp head”.
  • a compensation of a bending moment can be achieved by this geometry of the punches 1, 2. For this, e.g. B. a different wall thickness, wall openings and / or oblique transitions between the respective straight section 15, 16 and the respective conical section 13, 14 of the respective stamp 1, 2 contribute.
  • the geometries of the punches 1, 2 are different from one another, in particular both with regard to the respective straight section 15, 16 and also with regard to the respective conical section 13, 14. This can be due to different forces occurring and due to different dimensions of the punches 1, 2 be advantageous.
  • a spreading angle 19 (i.e. a cone opening angle) of the respective conical section 13, 14 can also be of different sizes in the two stamps 1, 2. For the sake of clarity, the spreading angle 19 is only shown for the second stamp 2. In an end position, the respective foot pieces 17, 18 are preferably on different levels.
  • stamps are preferably used in sintering presses, as described in the not yet published application DE 10 2014 201 966 the applicant with the title "powder press with a conical base", to which reference is made in this respect in full in the context of the disclosure.
  • Fig. 2 shows a cross section through the sintering press 12 Fig. 1 , in particular by the two punches 1, 2 and the die 5.
  • the execution of the transition between the respective conical sections 13, 14 and the respective straight sections 15, 16 of the two punches 1, 2 can be seen particularly clearly here.
  • the conical sections 13, 14 each have a wall thickness 20 of a wall 23, which is of different sizes at different locations of the conical sections 13, 14. Furthermore, a wall opening 21 is shown.
  • the Fig. 2 shows the asymmetry of the stamp 1, 2 with respect to the axial axis 6 more clearly than that Fig. 1 .
  • FIG. 3 is a perspective view from the outside
  • Fig. 4 a side view from the outside
  • Fig. 5 a cross-sectional view from the same perspective as that in Fig. 4 illustrated
  • Fig. 6 a top view from the outside.
  • reference numerals used reference is made to the above description of 1 and 2 referred.
  • Fig. 7 shows a perspective sectional view of a further embodiment of a sintering press 12 with a stamping tool 36 which has two stamps (an inner stamp 8 and an outer stamp 9) which can be moved in a die 5.
  • the outer punch 9 represents an upper punch 28 and the inner punch 8 a lower punch 29.
  • the two head pieces 10, 11 are each designed asymmetrically to an axial axis 6 of the sintering press 12 and are arranged eccentrically to the axial axis 6.
  • a green body 7 can be formed from powder in the die 5. Both stamps 8, 9 are designed in such a way that a bending moment that can be applied to the respective stamp 8, 9 can be compensated for.
  • the inner stamp 8 has an inner head piece 11 which can be moved within an outer head piece 10 of the outer stamp 9.
  • the outer head piece 10 of the outer stamp 9 surrounds the inner head piece 11, which is shown in the cross-sectional view as surrounding two sides.
  • the designation head piece 10, 11 is used synonymously with the term “stamp head”, which is also commonly used.
  • a bending tendency of the two punches 8, 9 can be reduced by the arrangement shown. Friction between the punches 8, 9 with one another, but also with the die 5, can thus be reduced, in particular even completely eliminated.
  • Fig. 8 shows part of the sintering press 12 Fig. 7 in an oblique view from the outside.
  • the inner punch 8 with the inner head piece 11 and the outer punch 9 with the outer head piece 10 can be seen.
  • the outer punch 9 has a material cutout 22, which is realized as a breakthrough through a wall 23 of the outer punch 9.
  • the material cutout 22 represents one of the material openings described above, through which the asymmetry of the respective stamp 8, 9 can be achieved.
  • the material cutout 22 serves in particular (as also described further above) to create an asymmetry in the respective stamp 8, 9.
  • the material cutout 22 or the asymmetry optionally also serves to create a bending compensation, as a result of which, for example, bending of the respective head piece 10, 11 or of the respective punch 8, 9 is counteracted in one direction.
  • the material cutout 22 has a longitudinal extent 24, which is larger than a circumferential extent 25.
  • Fig. 9 shows an oblique view of the outer stamp 9 from 7 and 8 , wherein the inner stamp 8 is not shown in this illustration.
  • the outer stamp 9 has thickenings 26 of the wall 23, in particular in the form of reinforcements 27.
  • the outer stamp 9 has material cutouts 22 (one of which is shown) in the wall 23. The thickenings 26 and the material cutouts 22 can help to reduce the tendency of the outer die 9 to bend.

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  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)

Claims (9)

  1. Outil à poinçonner (36) d'une presse à fritter (12), dans lequel des ébauches crues (7) peuvent être fabriquées à partir d'un matériau en poudre par compression; comprenant au moins un poinçon inférieur (29) et un poinçon supérieur (28), un premier poinçon (1) parmi le poinçon supérieur (28) et/ou le poinçon inférieur (29) présentant une pièce de tête (3), la partie de tête (3) agissant sur une surface frontale (35) d'une ébauche crue (7), la pièce de tête (3) étant asymétrique par rapport à un axe axial (6) de la presse à poinçonner, de telle sorte qu'une force axiale agissant lors de la compression agisse sur le premier poinçon (1) à distance de l'axe axial (6), le premier poinçon (1) présentant une géométrie qui s'élargit depuis la pièce de tête (3) vers une pièce de base (17), qui est également asymétrique par rapport à l'axe axial (6) de la presse à poinçonner, la géométrie asymétrique entre la pièce de tête (3) et la pièce de base (17) étant un renfort du premier poinçon (1), qui sert à l'amortissement d'un couple de basculement sur le premier poinçon (1) de manière adaptée à l'asymétrie de la pièce de tête (3).
  2. Outil à poinçonner (36) selon la revendication 1, caractérisé en ce que le premier poinçon (1) présente entre la pièce de tête (3) et la pièce de base (17) une structure creuse qui s'élargit, qui présente une épaisseur de matériau différente à une même hauteur le long d'une section transversale perpendiculaire par rapport à l'axe axial (6) de la presse à poinçonner.
  3. Outil à poinçonner (36) selon la revendication 1 ou 2, caractérisé en ce que le premier poinçon (1) est un poinçon composé comprenant une pièce de tête (3), une partie centrale, une partie inférieure et une pièce de base (17).
  4. Outil à poinçonner (36) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un mouvement de rotation du premier poinçon (1) est possible, par exemple pour une compensation du jeu.
  5. Outil à poinçonner (36) selon l'une quelconque des revendications précédentes, caractérisé en ce que le premier poinçon (1) et un deuxième poinçon (2) peuvent être déplacés l'un dans l'autre, le premier poinçon (1) et le deuxième poinçon (2) présentant chacun une pièce de tête (3, 4), qui est asymétrique par rapport à l'axe axial (6) de la presse à fritter (12), le premier poinçon (1) et le deuxième poinçon (2) présentant chacun une géométrie qui s'élargit depuis la pièce de tête (3, 4) vers la pièce de base (17, 18), qui est également asymétrique par rapport à l'axe axial (6) de la presse à fritter (12).
  6. Poinçon (1) d'un outil à poinçonner (36) selon l'une quelconque des revendications 1 à 5, le poinçon (1) servant à une utilisation dans une presse à fritter (12), caractérisé en ce que le poinçon (1) présente un élargissement asymétrique par rapport à un axe axial (6) du poinçon (1) depuis la pièce de tête (3) vers la pièce de base (17).
  7. Procédé de compression d'au moins un matériau en poudre dans une presse à fritter (12) en une ébauche crue (7), comprenant une introduction de poinçons supérieurs (28) et de poinçons inférieurs (29) dans une matrice (5), comprenant un remplissage de la matrice (5) avec le matériau en poudre et comprenant une compression du matériau en poudre, une ébauche crue à fritter ultérieurement (7) étant formée, qui obtient une géométrie asymétrique par rapport à un axe axial (6) de la presse à fritter (12) au moyen d'un outil à poinçonner (36) selon l'une quelconque des revendications 1 à 5, selon lequel un élargissement asymétrique depuis la pièce de tête (3) vers la pièce de base (17) d'un poinçon (1) est utilisé pour compenser un décalage latéral de ce poinçon (1) par rapport à un axe axial (6) de la presse à fritter lors de la compression.
  8. Procédé selon la revendication 7, caractérisé en ce qu'une détente coordonnée des poinçons (1, 2) de l'outil à poinçonner (36) a lieu de manière coordonnée les uns par rapport aux autres lors de la sortie de la matrice (5), sans qu'une commande de compensation ou un réglage de compensation ne soit utilisé sur la presse à fritter (12) pour la compensation de différences entre des processus de détente individuels lors de l'éloignement des poinçons (1, 2) de l'ébauche crue (7).
  9. Procédé selon la revendication 7 ou 8, caractérisé en ce qu'avant la compression, au moins le poinçon (1) asymétrique par rapport à un axe axial (6) de la presse à fritter (12) de l'outil à poinçonner (36) est composé à partir de plusieurs pièces individuelles et monté dans la presse à fritter (12).
EP16766550.4A 2015-09-18 2016-09-16 Presse pour pièce frittée et son procédé Active EP3349926B1 (fr)

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DE102015012005.0A DE102015012005A1 (de) 2015-09-18 2015-09-18 Stempelwerkzeug einer Sinterpresse und Verfahren hierzu
PCT/EP2016/071974 WO2017046332A1 (fr) 2015-09-18 2016-09-16 Ensemble poinçon d'une presse à fritter et procédé correspondant

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DE102014003726A1 (de) * 2014-03-18 2015-09-24 Gkn Sinter Metals Engineering Gmbh Presse zum Herstellen maßhaltiger Grünlinge und Verfahren zum Herstellen
DE102015201785A1 (de) * 2015-02-02 2016-08-04 Gkn Sinter Metals Engineering Gmbh Pulverpresse mit kegeligem Unterstempel
US11577312B2 (en) 2017-02-08 2023-02-14 Gkn Sinter Metals Engineering Gmbh Tool set having deflection compensation

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SU1041209A1 (ru) * 1982-02-25 1983-09-15 Предприятие П/Я Р-6205 Пресс-форма дл прессовани изделий из порошка
DE10142805C2 (de) * 2001-08-31 2003-10-16 Gkn Sinter Metals Gmbh Einteiliger Gelenkkörper
JP4519491B2 (ja) * 2004-03-23 2010-08-04 三菱マテリアルテクノ株式会社 粉末成形プレス装置
JP5070626B2 (ja) * 2008-07-30 2012-11-14 住友電工焼結合金株式会社 粉末成形用金型
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DE102014201966B4 (de) 2014-02-04 2024-09-26 Syntegon Technology Gmbh Vorrichtung und Verfahren zum Handling eines Trays
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US11577311B2 (en) 2023-02-14
EP3349926A1 (fr) 2018-07-25
WO2017046332A1 (fr) 2017-03-23
CN108290218A (zh) 2018-07-17
CN108290218B (zh) 2021-04-02
US20180281063A1 (en) 2018-10-04
ES2822829T3 (es) 2021-05-05
DE102015012005A1 (de) 2017-03-23

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