EP1287975A2 - 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

Info

Publication number: EP1287975A2
Authority: EP; European Patent Office
Prior art keywords: energy input; energy; value; press; pressing
Prior art date: 2001-08-31
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

EP02017011A

Other languages

German (de)

English (en)

Other versions

EP1287975A3 (fr

EP1287975B1 (fr

Inventor

Jürgen Hinzpeter

Ulrich Zeuschner

Ingo Schmidt

Thomas Pannewitz

Uwe Baltruschat

Thorsten Ehrich

Ulf Hauschild

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.)

Fette GmbH

Original Assignee

Fette 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.)

2001-08-31

Filing date

2002-07-27

Publication date

2003-03-05

2002-07-27 Application filed by Fette GmbH filed Critical Fette GmbH

2003-03-05 Publication of EP1287975A2 publication Critical patent/EP1287975A2/fr

2004-01-28 Publication of EP1287975A3 publication Critical patent/EP1287975A3/fr

2008-04-02 Application granted granted Critical

2008-04-02 Publication of EP1287975B1 publication Critical patent/EP1287975B1/fr

2022-07-27 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

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Classifications

- 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 producing pressed parts, in particular Carbide tips by pressing metal powder and subsequent sintering of the compacts according to claim 1.
From DE 197 17 217 is also known, depending on the geometry of the compact and the starting material during compression for a ram Determine and save the desired force-displacement diagram (target curve).
a computer records the measured values for the Path and the force of the ram compared to the target curve.
At least a separately operated section of the press ram or a separate one The pressure on the press material during the compression phase is stamped increases or decreases as soon as a deviation from the target curve is determined, to have an equal density for each compact at the end of the compression phase receive.
at least two position sensors must be provided are, namely for the at least one press stamp and the at least a further press stamp or a section of the press stamp, which their Put the measured values on a control computer.
the press stamp is assigned a force sensor. Its values are also given in the control computer.
the position sensors should ensure that e.g. with an upper and a lower stamp this one Approach the given position in the die to the given geometry of the To produce compacts and to maintain their dimensions. Because of different However, filling can result in fluctuations in density, which are avoided Need to become. Therefore, the further press stamp is provided, that of the control computer is actuated if a deviation occurs during the respective pressing process is determined from the desired sealing value. This procedure assumes that a more or less pronounced deformation on a surface of the Compacts that are required to achieve the desired density are accepted can be. This is e.g. for indexable inserts on the seat.
the maintenance of a given density of a compact important, since the density determines the shrinkage during sintering.
the Density can, of course, only be achieved indirectly through the press force introduced into the material determine what is known per se. It should be noted that the pressing force or the maximum pressing force is not completely equivalent to one given density, because the material of the compact depends on its nature springs open after the discharge, so that the density changes. This change may have undesirable influences. Will a certain geometry of the compact, there are different press force values in Depending on the filling quantity, but also depending on the homogeneity of the powder in the compact.
the invention has for its object a method for producing Pressed parts, in particular of carbide inserts, by pressing Specify metal powder in powder presses, in which the manufacture of the compacts reproducibly accurate products in the sintering process.
the invention is based on the knowledge that e.g. with an indexable insert with a given topography in the area of the cutting edge and the top the upper area of the compact is sensitive and therefore special care should be taken when Achieving the desired density in this area must be used.
This is done in the invention in that the energy input of the upper punch is specified in the upper area of the compact. Find this energy entry essentially takes place in a regulated manner, so is the desired density and ensures the even density distribution in this area. Then it is not so important whether the remaining area of the compact is pressed with exactly the same density becomes. However, in this area too a density in the upper area Obtaining an approximate density is the total energy input for the compact determined.
the press force is not regulated.
the energy input is taken as a basis and assumes that the desired density in the upper area of the compact has been reached when the Energy input has a predetermined value.
the lower stamp is in this Procedure "tracked" the upper stamp by using the remaining energy input is advanced. Residual energy means the energy which is left if of the given total energy that of the upper stamp registered energy is subtracted. It can happen that the specified Thickness of the compact is not reached. In this case is on the sintered Shaping requires reworking. But it may also be not harmful if the energy input of the Lower stamp becomes a little higher because of the influence on the compression of the upper one Range is negligible.
the course of the energy input saved via a press path of the upper punch and the feed of the Upper stamp is regulated in accordance with this course. This can be done be thought of dividing the total energy into a number of increments, according to which regulation of the advance of the upper die is then possible.
an embodiment of the invention provides that the first and second value for the energy input only for the second half of the pressing path of the Top stamp can be saved or only during the second half of the pressing process of the upper stamp the energy input from the upper and lower stamp with the first and second values are compared. It is understood that the regulatory route in relation to the press path also close to the end of the press path can be placed.
the energy that is introduced into a compact during pressing is the product by force times press path. In reality, however, is the energy actually used not the same as this product, but less because the compact springs open part of the press energy has not been used for compression.
the spring deflection of the compact is measured and calculated the unused energy from it. This calculation can be used for correction when pressing the next compact, if the input energy actually used does not correspond to a predetermined value.
the entered one can then Energy to be changed. This can e.g. by changing the filling, by Different travels of the filling shoe due to vibration of the die, bottom and / or Upper stamp or the like can be achieved.
FIG. 1 and 2 show a die 10, the bore of which forms a mold cavity 12, which is conical in cross section. With the help of such A cavity can be created in the mold cavity 12, e.g. for a cutting insert, as shown in Fig. 5. 5 has a clearance angle.
the top edge of the mold cavity 12 (die hole) from the top edge of the Matrix 12 has a distance x.
Above the die 12 is an upper punch 14 and a lower stamp 16 is indicated below the die 10.
the stamps 14, 16 will be actuated in a suitable manner, preferably with hydraulic press cylinders. These can be controlled (not shown) in such a way that they exert a desired force. They can also be controlled at a speed of one to generate the desired force-time curve. Suitable force measuring devices that are assigned to the punches 14, 16, determine the press forces applied in each case. Path sensors, not shown, determine the positions of the upper and lower stamps 14, 16 during the pressing process.
the lower punch 16 When the die bore is filled, the lower punch 16 has a predetermined one Filling position. Its position determines the filling quantity. Preferably the position at the beginning somewhat lower than the theoretical filling position for the given one Quantity, so that after filling the lower stamp a certain distance the column can go up so that the filler shoe, not shown, excess material from the top of the die. Then upper stamp 14 and Lower punch 16 moved into the die hole, the upper punch 14 drives so far that it lies on the top of the mold cavity 12 comes. The depth of entry into the die hole therefore corresponds to dimension x. The Lower stamp 16 is also moved to a predetermined position, as shown in Fig. 2 is shown. Then the pressing process takes place.
the embodiment 3 and FIG. 4 differs from that of FIGS. 1 and 2 in that the bore of the die is cylindrical. That with the help of the procedure manufactured insert has no clearance angle. Incidentally, the Embodiment according to Figures 3 and 4 with the same reference numerals as 1 and 2 provided.
a predetermined Density are generated.
the energy or the work done corresponds to that measured press force times the press travel. Therefore, this procedure does not Move according to a predetermined target curve for the pressing force, but to achieve it seen a constant energy input for all compacts. For this heard that the pressing force of the lower punch can be quite different.
the pressure of the lower punch is determined by the energy input from Upper stamp "traced". This can result in the lower area of the sintered cutting plate 20 has a slightly different density from the upper region prevails. However, this must be accepted if it is guaranteed that upper area of the insert 20 precise dimensions can be achieved.
the press force curve increases up to a maximum press force P max .
the integral under 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 easily possible to control the upper punch 14 in such a way that predetermined energy increments are entered. However, the energy ultimately used is less than the energy initially entered because the compact shows a spring-back behavior.
a kind of hysteresis is formed, as shown in FIG. 6.
the area between the branches according to the curve. 6 forms the unused energy for the compression of the compact. The energy that results from the area below the lower curve is therefore decisive for the desired density in the upper region of the cutting plate 20.
the spring behavior can be measured and the unused energy can be determined from the spring travel.
the spring-open can no longer be used for the respective compact, but only for the next compact.
the energy entered by the upper punch can be influenced and thus changed until the desired value is reached.

Landscapes

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

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
DE10142772		2001-08-31
DE10142772A DE10142772C2 (de)	2001-08-31	2001-08-31	Verfahren zur Herstellung von Pressteilen in einer Pulverpresse

Publications (3)

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

Family

ID=7697312

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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP2944457A3 (fr) *	2014-04-10	2015-12-16	Dorst Technologies GmbH & Co. KG	Dispositif de commande à pression et procédé de commande d'une pression pour une presse à poudre métallique et/ou céramique
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

Families Citing this family (6)

* 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
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
CN119239040B (zh) *	2024-12-04	2025-02-25	太重（天津）滨海重型机械有限公司	用于炭素挤压生产的翻料装置及设备

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DE3919847A1 (de) *	1989-06-15	1990-12-20	Mannesmann Ag	Verfahren und vorrichtung zur herstellung masshaltiger presslinge
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DE4209767C1 (fr) *	1992-03-23	1993-05-06	Mannesmann Ag, 4000 Duesseldorf, De
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SE515822C2 (sv) *	1999-12-30	2001-10-15	Skf Nova Ab	Metod och anordning för kompaktering av pulvermetallkroppar
US6531090B2 (en) *	2000-02-17	2003-03-11	Sumitomo Special Metals Co., Ltd.	Method for producing powder compact and method for manufacturing magnet
DE10010671C2 (de) *	2000-03-04	2002-03-14	Fette Wilhelm Gmbh	Verfahren zur Herstellung von Preßteilen durch Pressen von Metallpulver und anschließendes Sintern des Preßlings

2001
- 2001-08-31 DE DE10142772A patent/DE10142772C2/de not_active Expired - Fee Related
2002
- 2002-07-27 EP EP02017011A patent/EP1287975B1/fr not_active Expired - Lifetime
- 2002-07-27 AT AT02017011T patent/ATE391004T1/de not_active IP Right Cessation
- 2002-07-27 DE DE50212003T patent/DE50212003D1/de not_active Expired - Fee Related
- 2002-08-22 US US10/225,747 patent/US7211217B2/en not_active Expired - Fee Related

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP2944457A3 (fr) *	2014-04-10	2015-12-16	Dorst Technologies GmbH & Co. KG	Dispositif de commande à pression et procédé de commande d'une pression pour une presse à poudre métallique et/ou céramique
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
US12358048B2 (en)	2021-04-22	2025-07-15	Gkn Sinter Metals Engineering Gmbh	Method for determining a parameter of a material and pressing tool for the production of a green compact

Also Published As

Publication number	Publication date
DE50212003D1 (de)	2008-05-15
DE10142772A1 (de)	2003-03-27
US7211217B2 (en)	2007-05-01
EP1287975A3 (fr)	2004-01-28
US20030049147A1 (en)	2003-03-13
EP1287975B1 (fr)	2008-04-02
ATE391004T1 (de)	2008-04-15
DE10142772C2 (de)	2003-09-25

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