EP1287975B1 - Procédé pour la production d'éléments moulés dans une presse à poudre - Google Patents

Procédé pour la production d'éléments moulés dans une presse à poudre Download PDF

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Publication number
EP1287975B1
EP1287975B1 EP02017011A EP02017011A EP1287975B1 EP 1287975 B1 EP1287975 B1 EP 1287975B1 EP 02017011 A EP02017011 A EP 02017011A EP 02017011 A EP02017011 A EP 02017011A EP 1287975 B1 EP1287975 B1 EP 1287975B1
Authority
EP
European Patent Office
Prior art keywords
energy
ram
value
predetermined
compact
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.)
Expired - Lifetime
Application number
EP02017011A
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German (de)
English (en)
Other versions
EP1287975A2 (fr
EP1287975A3 (fr
Inventor
Jürgen Hinzpeter
Ulrich Zeuschner
Ingo Schmidt
Thomas Pannewitz
Uwe Baltruschat
Thorsten Ehrich
Ulf Hauschild
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Fette GmbH
Original Assignee
Fette GmbH
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Filing date
Publication date
Application filed by Fette GmbH filed Critical Fette GmbH
Publication of EP1287975A2 publication Critical patent/EP1287975A2/fr
Publication of EP1287975A3 publication Critical patent/EP1287975A3/fr
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Publication of EP1287975B1 publication Critical patent/EP1287975B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/22—Control arrangements for fluid-driven presses controlling the degree of pressure applied by the ram during the pressing stroke
    • 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
    • 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
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • the invention relates to a method for the production of pressed parts, in particular cutting plates made of hard metal by pressing metal powder and subsequent sintering of the compacts according to claim 1.
  • z. B. for carbide inserts is the maintenance of a predetermined total height between the insert seat and at least one cutting edge having a predetermined distance from the insert seat.
  • the document DE 197 17 217 discloses a method for producing pressed parts according to the preamble of claim 1.
  • At least two position sensors must be provided, namely for the at least one ram and the at least one further ram or a portion of the ram, which give their measured values in each case to a control computer.
  • a force sensor is associated with the ram or a portion of the ram. Also its values are given in the control computer.
  • the position sensors are intended to ensure that, for example, in the case of an upper punch and a lower punch, these move to a predetermined position in the die in order to produce the predetermined geometry of the compact and to maintain its dimensions. Due to different filling, however, density fluctuations can arise, which must be avoided.
  • the further press die is provided, which is actuated by the control computer, if a deviation from the desired density value is determined during the respective pressing operation.
  • This method assumes that a more or less pronounced deformation can be tolerated on a surface of the compact required to achieve the desired density. This is the case for indexable inserts on the seat, for example.
  • the adherence to a given density of a compact is important because the density subsequently determines the shrinkage during sintering.
  • the density can only be determined indirectly via the pressing force introduced into the material, which is known per se. It should be noted that the pressing force or the maximum pressing force is not completely equal to a given density, because the material of the compact springs depending on its nature after the relief springs, so that the density changes. This change may have undesirable effects. If a specific geometry of the compact is adhered to, different pressing force values result depending on the filling quantity, but also depending on the homogeneity of the powder in the compact.
  • the invention has for its object to provide a method for producing pressed parts, in particular of cutting inserts made of hard metal, by pressing metal powder in powder presses, in which the production of the compacts lead to reproducible accurate products in the sintering process.
  • the invention is based on the recognition that, for example, in the case of an indexable insert having a predetermined topography in the area of the cutting edge and the top, the upper area of the compact is sensitive and therefore special care must be taken in achieving the desired density in this area.
  • This is done in the invention in that the energy input of the upper punch is set in the upper part of the compact. If this energy input takes place essentially in a regulated manner, the desired density and the uniform density distribution in this area are guaranteed. It is then not so important whether the remaining area of the compact is compressed exactly with the same density. However, in order to obtain a density close to the density in the upper region, the total energy input for the compact is determined.
  • the energy input is taken as the basis and assumed that the desired density in the upper region of the compact has been reached when the energy input has a predetermined value.
  • the lower punch is "nachrile" in this method the upper punch by being advanced in accordance with the residual energy input. Residual energy refers to the energy that remains when the energy entered by the upper stamp is deducted from the given total energy. This can happen that the predetermined thickness of the compact is not achieved. In this case, reworking is required on the sintered molding. Under certain circumstances, however, it may not be harmful if the energy input of the lower punch is slightly higher in order to reach the set thickness, since the influence on the compression of the upper portion is negligible.
  • the course of the energy input stored on a press travel of the upper punch and the feed of the upper punch is regulated in accordance with this course.
  • it can be thought of dividing the total energy in a number of increments, after which then a control of the feed of the upper punch is possible.
  • an embodiment of the invention provides that the first and second value for the energy input are stored only for the second half of the press path of the upper punch or only during the second half of the pressing operation of the upper punch the energy input of upper and lower punch with the first and second values be compared. It is understood that the control path in relation to the pressing path can also be placed close to the end of the pressing path.
  • the energy that is entered into a compact during pressing is the product of force pressing. In reality, however, the energy actually used is not equal to this product, but lower because the compact has rebounded, and consequently part of the press energy has not been used for compaction.
  • the Auffederweg of the compact is measured and calculated from the unused energy. This calculation can be used to correct the compression of the next compact if the actually used input energy does not correspond to a predetermined value.
  • the energy input can then be changed. This can be done, for example, by changing the filling, by different travels of the filling shoe to be achieved by vibration of the die, lower and / or upper punch or the like.
  • a die 10 is shown, whose bore has a mold cavity 12, which is conical in cross-section. With the help of such a mold cavity 12, a compact can be produced, for example for a cutting plate, as in Fig. 5 is shown.
  • the cutting plate after Fig. 5 has a clearance angle.
  • the upper edge of the mold cavity 12 (die bore) from the top edge of the die 12 is spaced x.
  • an upper punch 14 and below the die 10, a lower punch 16 is indicated.
  • the stamps 14, 16 are actuated in a suitable manner, preferably with hydraulic press cylinders. These are controllable (not shown) to apply a desired force. In addition, they can be speed controlled to produce a desired force-time curve.
  • Suitable force measuring devices which are associated with the punches 14, 16, determine the respectively applied pressing forces. Displacers, not shown, determine the positions of the upper and lower punches 14, 16 during the pressing process.
  • the lower punch 16 When filling the die bore, the lower punch 16 has a predetermined filling position. Its position determines the filling quantity. Preferably, the position is initially slightly lower than the theoretical filling position for the predetermined amount, so that after filling the lower punch a certain distance can go up the column, so that the filling shoe, not shown, wipes excess material from the Matrizenoberseite. Subsequently, upper punch 14 and lower punch 16 are moved into the die bore, wherein the upper punch 14 moves in so far that it comes to rest on the upper side of the mold cavity 12. The entry depth into the die bore thus corresponds to the dimension x. The lower punch 16 is also moved to a predetermined position, as in Fig. 2 is shown. Subsequently, the pressing process takes place.
  • FIG. 3 and FIG. 4 is different from the one after the Figures 1 and 2 in that the bore of the die is cylindrical.
  • the cutting plate produced by means of the method has no clearance angle.
  • Fig. 5 From the illustration to Fig. 5 It can be seen that the cutting plate 20, the cutting edge 22 adjacent two grooves 24, 26 has.
  • the grooves are indicated here for illustration purposes only.
  • Cutting plates of the type shown can be different Topographies on the top, which should improve the cutting behavior of the plate.
  • the cutting edges 22 often have no linear extension, but are curved in space in a predetermined manner.
  • a predetermined density can be generated.
  • the energy input with the upper punch 14 corresponds to a predetermined value when the punch has reached its end position.
  • the energy or applied work corresponds to the measured pressing force times the pressing path.
  • this method does not proceed according to a predetermined setpoint curve for the pressing force, but is seen as achieving a constant energy input for all compacts.
  • the pressing force of the lower punch is "nachiner" in accordance with the energy input from the upper punch. It can thereby happen that in the lower region of the sintered cutting plate 20 there is a density that deviates somewhat from the upper region. However, this is to be accepted if it is ensured that 20 precise dimensions are achieved for the upper portion of the cutting plate.
  • a force-displacement diagram for the upper punch 14 is shown.
  • the press force curve increases up to a maximum Presskraftwerg P max .
  • the integral below this curve corresponds to the energy input E during the pressing process.
  • the energy input E is composed of individual increments ⁇ E, and it is readily possible to control the upper punch 14 so that predetermined energy increments are entered.
  • the energy ultimately used is less than the initially registered energy, because the compact shows a Auffederungs . It forms a kind of hysteresis, as in Fig. 6 shown.
  • the area between the branches of the curve after. Fig. 6 forms the unused energy for the compression of the compact.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Hard Magnetic Materials (AREA)

Claims (4)

  1. Procédé pour la production d'éléments moulés, en particulier de matrices de découpage en métal-dur, par compression de poudre métallique et frittage subséquent des pièces matricées, dans lequel les pièces matricées sont formées dans une presse à poudre qui présente un support de matrice (10), un poinçon supérieur (14) et au moins un poinçon inférieur (16) qui sont affectés à un alésage de matrice et peuvent être actionnés par un cylindre de presse hydraulique, dans lequel des dispositifs de mesure de force et des dispositifs de mesure de déplacement sont affectés aux poinçons (10, 14) pour la mesure des forces de compression pendant l'avancement des poinçons jusqu'aux positions finales, caractérisé en ce que pour une pièce matricée de géométrie et dimensions prédéfinies ainsi que de matériau prédéfini, la valeur pour l'énergie à mettre en oeuvre par le poinçon supérieur (10) est enregistrée, en ce que, en outre, comme seconde valeur, l'énergie (E) totale à apporter par les poinçons supérieur et inférieur (10, 14) est enregistrée, en ce que l'avancement du poinçon supérieur (10) est terminé quand son apport d'énergie a atteint la première valeur prédéfinie et l'avancement du poinçon inférieur (14) a lieu conformément à l'apport d'énergie résiduelle et est terminé quand l'énergie totale (E) a atteint la seconde valeur prédéfinie.
  2. Procédé selon la revendication 1, caractérisé en ce que l'allure de l'apport d'énergie est enregistrée pendant un déplacement de presse du poinçon supérieur (10) et l'avancement du poinçon supérieur (10) est réglé conformément à cette allure.
  3. Procédé selon la revendication 2, caractérisé en ce que la première et la seconde valeur ne sont enregistrées que pour la seconde moitié du déplacement de presse du poinçon supérieur (10) ou bien l'apport d'énergie du poinçon supérieur (10) est comparé à l'apport d'énergie des poinçons supérieur et inférieur (10, 14) seulement pendant la seconde moitié du déplacement de presse.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'après la fin du processus de compression, le déplacement de détente pour la pièce matricée est mesuré et à partir de la détente, l'énergie non utilisée pour la densification est calculée et est soustraite de l'apport d'énergie total (E) pour la détermination de l'apport d'énergie réel pour la pièce matricée et lors du prochain processus de compression, au moins un paramètre influant sur le processus de compression est changé, lorsque l'apport d'énergie réel diffère de la seconde valeur prédéfinie.
EP02017011A 2001-08-31 2002-07-27 Procédé pour la production d'éléments moulés dans une presse à poudre Expired - Lifetime EP1287975B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10142772A DE10142772C2 (de) 2001-08-31 2001-08-31 Verfahren zur Herstellung von Pressteilen in einer Pulverpresse
DE10142772 2001-08-31

Publications (3)

Publication Number Publication Date
EP1287975A2 EP1287975A2 (fr) 2003-03-05
EP1287975A3 EP1287975A3 (fr) 2004-01-28
EP1287975B1 true EP1287975B1 (fr) 2008-04-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02017011A Expired - Lifetime EP1287975B1 (fr) 2001-08-31 2002-07-27 Procédé pour la production d'éléments moulés dans une presse à poudre

Country Status (4)

Country Link
US (1) US7211217B2 (fr)
EP (1) EP1287975B1 (fr)
AT (1) ATE391004T1 (fr)
DE (2) DE10142772C2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004008322B4 (de) 2004-02-20 2008-11-27 Fette Gmbh Pulverpresse
JP4918999B2 (ja) 2006-05-19 2012-04-18 クオリカプス株式会社 粉体圧縮成形機及び該成形機を用いた粉体圧縮成形物の連続製造装置
DE102014105111A1 (de) * 2014-04-10 2015-10-15 Dorst Technologies Gmbh & Co. Kg Drucksteuerungsvorrichtung und Verfahren zum Steuern eines auszugebenden Drucks für eine Keramik- und/oder Metallpulver-Presse
BE1023781B1 (nl) * 2016-05-18 2017-07-24 Cnh Industrial Belgium Nv Rechthoekigebalenpers met een verbeterd systeem en een verbeterde regelmethode voor het regelen van de baalvorming
CN106079513A (zh) * 2016-07-21 2016-11-09 太仓贝斯特机械设备有限公司 一种高效率可控式热压成型装置
CN111360248B (zh) * 2020-03-31 2023-04-18 珠海精磁新材料技术有限公司 一种改进型一模多腔粉末冶金成型模具
EP4079427A1 (fr) * 2021-04-22 2022-10-26 GKN Sinter Metals Engineering GmbH Procédé de détermination d'un paramétré d'une matière et outil de compression destiné à la fabrication d'un comprimé cru

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Also Published As

Publication number Publication date
DE10142772C2 (de) 2003-09-25
DE50212003D1 (de) 2008-05-15
EP1287975A2 (fr) 2003-03-05
EP1287975A3 (fr) 2004-01-28
DE10142772A1 (de) 2003-03-27
US7211217B2 (en) 2007-05-01
US20030049147A1 (en) 2003-03-13
ATE391004T1 (de) 2008-04-15

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