EP1287977A2 - Procédé et dispositif pour minimaliser la dispersion des forces maximales dans une presse à poudre - Google Patents

Procédé et dispositif pour minimaliser la dispersion des forces maximales dans une presse à poudre Download PDF

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Publication number
EP1287977A2
EP1287977A2 EP02017261A EP02017261A EP1287977A2 EP 1287977 A2 EP1287977 A2 EP 1287977A2 EP 02017261 A EP02017261 A EP 02017261A EP 02017261 A EP02017261 A EP 02017261A EP 1287977 A2 EP1287977 A2 EP 1287977A2
Authority
EP
European Patent Office
Prior art keywords
filling
powder
filling shoe
maximum pressing
standard deviation
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
EP02017261A
Other languages
German (de)
English (en)
Other versions
EP1287977B1 (fr
EP1287977A3 (fr
Inventor
Jürgen Hinzpeter
Ulrich Zeuschner
Ingo Schmidt
Thomas Pannewitz
Udo 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.)
Filing date
Publication date
Application filed by Fette GmbH filed Critical Fette GmbH
Publication of EP1287977A2 publication Critical patent/EP1287977A2/fr
Publication of EP1287977A3 publication Critical patent/EP1287977A3/fr
Application granted granted Critical
Publication of EP1287977B1 publication Critical patent/EP1287977B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/004—Filling molds with powder
    • 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
    • B30B11/022—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 whereby the material is subjected to vibrations
    • 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
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses
    • B30B15/302—Feeding material in particulate or plastic state to moulding presses
    • 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 minimizing the spread of the maximum pressing forces when pressing powder with the help of a powder press according to claim 1.
  • the powder material in its Density is as homogeneous as possible. It is known to improve homogeneity by that the filling shoe is operated in a predetermined manner, for example when Forward and return stroke at different speeds. It is also known that Filling shoe not only linearly in one direction back and forth over the die hole to move, but to overlay this movement at least one sideways movement. It is also known to use a suitable filling shoe and die plate Vibrating device with predetermined frequency and amplitude in vibrations to improve the homogeneity of the powder in the die hole. Finally, it is also conceivable to shake the lower and upper stamps, in particular during the filling process and at the beginning of the pressing process.
  • the invention has for its object a method and an apparatus for Minimization of the spread of the maximum pressing forces when pressing powder in powder presses, which can be carried out completely automatically.
  • the frequency distribution of the Press force values determined and from this the standard deviation.
  • the standard deviation is known to lie between the turning points of the Gaussian distribution curve.
  • the determined standard deviation deviates from a given one minimum deviation, a change according to the invention is at least one Changed process parameters.
  • the vibration parameters be changed, the course of the filling shoe, the speed of the Filling shoe or the temporal course of the speed during the pre and Return strokes, etc.
  • individual or combinations of parameters can be changed.
  • the standard deviation is always anew is determined and it can be determined whether this is smaller, it is in this way possible to get a minimization of the standard deviation.
  • the operation of the powder press or the pressing process can be done completely automated and a minimization of the standard deviation within shortest Time to be reached. It is also possible to make other changes to the Pressing process, for example with a different powder material, with a change the maximum pressing force or the like also minimizing the To achieve standard deviation.
  • a Gaussian distribution curve for the maximum pressing force of a powder press is shown on an attached drawing sheet.
  • X the average of the maximum pressing force is given, with s the standard deviation at the turning point of the distribution curve and with R the span. It is understood that s is minimal in order to obtain reproducibly uniform compacts. On the other hand, it is not possible to let the standard deviation go to zero.
  • the device provides a controller for controlling the powder press, which also controls the means for shaking the different parts of the pressing process involved components and to control the drive for the filling shoe and its path when moving on the die plate.
  • Storage provided in which the respective measured maximum press force values, the respective parameters for the actuation of the filling shoe and / or the frequencies and amplitudes for the vibrator are stored.
  • There is also a computer level provided in which the frequency distribution of those read from the memory maximum press force values and the standard deviation can be determined.
  • a program level in which a scheme for different Parameter values for the actuation of the filling shoe and / or the frequencies of the Vibrating device are stored and a predetermined sequence of these data or the combination of these data in such a way that the program level subsequently follows the predefined ones Make changes until the standard deviation reaches a given one Value reached or a minimum.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Control Of Presses (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP02017261A 2001-08-31 2002-08-01 Procédé et dispositif pour minimaliser la dispersion des forces maximales dans une presse à poudre Expired - Lifetime EP1287977B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10142623A DE10142623C2 (de) 2001-08-31 2001-08-31 Verfahren und Vorrichtung zur Minimierung der Streuung der maximalen Presskräfte in einer Pulverpresse
DE10142623 2001-08-31

Publications (3)

Publication Number Publication Date
EP1287977A2 true EP1287977A2 (fr) 2003-03-05
EP1287977A3 EP1287977A3 (fr) 2004-01-28
EP1287977B1 EP1287977B1 (fr) 2008-03-12

Family

ID=7697203

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02017261A Expired - Lifetime EP1287977B1 (fr) 2001-08-31 2002-08-01 Procédé et dispositif pour minimaliser la dispersion des forces maximales dans une presse à poudre

Country Status (5)

Country Link
US (1) US7147820B2 (fr)
EP (1) EP1287977B1 (fr)
AT (1) ATE388809T1 (fr)
DE (2) DE10142623C2 (fr)
ES (1) ES2304236T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1964664A1 (fr) * 2007-02-27 2008-09-03 Maschinenfabrik Lauffer GmbH & Co. KG Presse à poudre pour la fabrication de pièces brutes et procédé pour la commande de presse

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6402615B2 (ja) * 2013-12-24 2018-10-10 信越化学工業株式会社 希土類焼結磁石の製造方法及び成形装置
JP6281482B2 (ja) * 2013-12-24 2018-02-21 信越化学工業株式会社 希土類焼結磁石の製造方法及び成形装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100598A (en) * 1975-09-05 1978-07-11 Hoffmann-La Roche Inc. Tablet press related instrumentation for use in development and control of formulations of pharmaceutical granulations
US4238431A (en) * 1977-09-22 1980-12-09 Wilhelm Fette Gmbh Method for the production of tablets and a tablet press
DE19903417A1 (de) * 1999-01-29 2000-08-10 Fette Wilhelm Gmbh Verfahren zum Befüllen von Hydraulikpressen mit Pulvern

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2549642A (en) * 1945-08-24 1951-04-17 Gen Bronze Corp Press with vibrating die for forming powder metal blanks
US3593366A (en) * 1968-12-11 1971-07-20 Wolverine Pentronix Multiple punch tool set for powder compacting press
US3640654A (en) * 1970-06-25 1972-02-08 Wolverine Pentronix Die and punch assembly for compacting powder and method of assembly
US4041123A (en) * 1971-04-20 1977-08-09 Westinghouse Electric Corporation Method of compacting shaped powdered objects
US3730659A (en) * 1971-10-04 1973-05-01 Wolverine Pentronix Powder dispenser for a powder compacting press
US3788787A (en) * 1971-11-26 1974-01-29 H Silbereisen Hydraulic metal powder press
US4008023A (en) * 1972-03-27 1977-02-15 United Technologies Corporation Mold pack for making metal powder articles
BG18244A1 (fr) * 1973-04-25 1974-10-25
US3890413A (en) * 1974-08-15 1975-06-17 Hydramet American Inc Apparatus and method for compacting particulate materials
FR2302287A1 (fr) * 1975-02-27 1976-09-24 Commissariat Energie Atomique Procede et appareillage de frittage sous charge
US4260346A (en) * 1979-10-09 1981-04-07 Anderson Jr Raymond B Press assembly for powder material
US4583966A (en) * 1982-10-13 1986-04-22 Beloit Corporation Method of filling calender/embosser rolls using vibrations
DE3639918A1 (de) * 1986-03-26 1987-10-08 Thomas Eng Inc Vorrichtung zur steuerung und ueberwachung einer rotationstablettierpresse
JPH0780069B2 (ja) * 1986-11-25 1995-08-30 敏彦 朝見 振動プレス成形機
US4946634A (en) * 1987-04-16 1990-08-07 Gte Products Corporation Powder compacting press to control green density distribution in parts
DE3919821C2 (de) * 1989-06-15 1994-04-07 Mannesmann Ag Verfahren und Vorrichtung zum Herstellen von maßhaltigen Preßlingen
US5672363A (en) * 1990-11-30 1997-09-30 Intermetallics Co., Ltd. Production apparatus for making green compact
US5211964A (en) * 1991-05-20 1993-05-18 Westinghouse Electric Corp. Press machine with means to adjust punching force
DE19717217C2 (de) * 1997-04-24 1999-12-02 Fette Wilhelm Gmbh Verfahren und Vorrichtung zur Herstellung von Preßlingen aus Hartmetall, Keramik, Sintermetall oder dergleichen
US6432158B1 (en) * 1999-10-25 2002-08-13 Sumitomo Special Metals Co., Ltd. Method and apparatus for producing compact of rare earth alloy powder and rare earth magnet
DE19955196A1 (de) * 1999-11-16 2001-05-23 Korsch Pressen Ag Verfahren zum Konstanthalten der Bruchhärte von Tabletten
KR20010086905A (ko) * 2000-03-04 2001-09-15 김영정 양압 성형시스템

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100598A (en) * 1975-09-05 1978-07-11 Hoffmann-La Roche Inc. Tablet press related instrumentation for use in development and control of formulations of pharmaceutical granulations
US4238431A (en) * 1977-09-22 1980-12-09 Wilhelm Fette Gmbh Method for the production of tablets and a tablet press
DE19903417A1 (de) * 1999-01-29 2000-08-10 Fette Wilhelm Gmbh Verfahren zum Befüllen von Hydraulikpressen mit Pulvern

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1964664A1 (fr) * 2007-02-27 2008-09-03 Maschinenfabrik Lauffer GmbH & Co. KG Presse à poudre pour la fabrication de pièces brutes et procédé pour la commande de presse
US7774092B2 (en) 2007-02-27 2010-08-10 Maschinenfabrik Lauffer Gmbh & Co., Kg Process for the press control of a powder metal press in the production of moldings

Also Published As

Publication number Publication date
DE10142623C2 (de) 2003-11-06
ATE388809T1 (de) 2008-03-15
DE10142623A1 (de) 2003-04-03
EP1287977B1 (fr) 2008-03-12
US20030047089A1 (en) 2003-03-13
US7147820B2 (en) 2006-12-12
ES2304236T3 (es) 2008-10-01
EP1287977A3 (fr) 2004-01-28
DE50211876D1 (de) 2008-04-24

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