EP1964664A1 - Presse à poudre pour la fabrication de pièces brutes et procédé pour la commande de presse - Google Patents

Presse à poudre pour la fabrication de pièces brutes et procédé pour la commande de presse Download PDF

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Publication number
EP1964664A1
EP1964664A1 EP07003955A EP07003955A EP1964664A1 EP 1964664 A1 EP1964664 A1 EP 1964664A1 EP 07003955 A EP07003955 A EP 07003955A EP 07003955 A EP07003955 A EP 07003955A EP 1964664 A1 EP1964664 A1 EP 1964664A1
Authority
EP
European Patent Office
Prior art keywords
dimensions
press
test station
moldings
tolerance
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
EP07003955A
Other languages
German (de)
English (en)
Other versions
EP1964664B1 (fr
Inventor
Albert Rundel
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.)
Maschinenfabrik Lauffer GmbH and Co KG
Original Assignee
Maschinenfabrik Lauffer GmbH and Co KG
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 Maschinenfabrik Lauffer GmbH and Co KG filed Critical Maschinenfabrik Lauffer GmbH and Co KG
Priority to EP07003955.7A priority Critical patent/EP1964664B1/fr
Priority to US12/035,651 priority patent/US7774092B2/en
Publication of EP1964664A1 publication Critical patent/EP1964664A1/fr
Application granted granted Critical
Publication of EP1964664B1 publication Critical patent/EP1964664B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C3/00—Registering or indicating the condition or the working of machines or other apparatus, other than vehicles
    • G07C3/14—Quality control systems
    • G07C3/146—Quality control systems during manufacturing process

Definitions

  • the invention relates to a press for producing pressed moldings from powdered or granular materials, comprising a pressing tool having a mold for filling the material, and at least one punch which is movable relative to the mold, wherein the press an electronic control and means for determining and automatically correcting the punch stroke.
  • the invention also relates to a method for controlling such a press.
  • a dedicated pressing tool consists in the simplest case of an upper and a lower punch and a forming die made of hardened steel or carbide. After filling the mold with, for example, powdered material, the powder is compacted by the punches of the pressing tool.
  • the at least one moving punch is driven by a suitable power drive, either mechanically or hydraulically.
  • An upper and a lower press cylinder is connected to the upper and the lower punch, which are associated with a die bore.
  • the powder is filled with retracted into the die bore lower punch with the help of a filling shoe.
  • An accurate dosage is achieved by then raising the lower punch by a predetermined amount and removing excess powder from the die plate surface by stripping. Thereafter, with the upper punch, which enters the die from above, the powder is compressed, whereby the lower punch can be adjusted accordingly.
  • the individual moldings of a series have an approximately equal density at substantially constant dimensions.
  • the maximum pressing force in the production of the shaped articles results in a variation, depending on the stamp stroke, which is determined by the filling quantity and the distribution of the powder in the mold. Due to changes in the powder due to environmental influences, a small difference in filling quantity or an inhomogeneous distribution of the powder in the mold, molded articles produced in succession can have a different weight or dimension after pressing. Even minor deviations from one another or given reference values can result in an increased scrap content after sintering.
  • This type of statistical process control serves to continuously monitor and, if necessary, correct the pressing process.
  • the production monitoring with the help of Statistical Process Control (SPC) is based on a random check of pressed moldings after the production of a part lot of a production lot.
  • a process control coupled to such a check of the moldings essentially serves to eliminate systematic influences and has a delayed effect on the pressing process.
  • This frequently practiced method has the particular disadvantage that any critical deviations that may occur are recognized too late and the correction of the punch stroke and / or the pressing pressure is initiated too late.
  • the object of the invention is to propose a powder press for producing pressed moldings and a method for controlling the press, with which moldings with constant dimensions within a predetermined tolerance can be generated, with systematic and random influences on the pressing process of pressed in succession moldings is counteracted early , So that the convincedslos has a reduced dispersion of the dimensions of the moldings.
  • a test station for automatic detection is following the pressing tool provided by dimensions of the molding, which is vibration-decoupled from the press.
  • the press also has an electronic control and means for determining and automatically correcting the punch stroke.
  • the control and / or the test station are equipped with a memory in which measures determined by the test station can be stored together with set dimensions and tolerances assigned to the setpoint dimensions. For the control of the press, the controller automatically compares the respectively measured (actual) dimensions with the target dimensions and with the tolerances determined by permitted tolerances and automatically influences the parameters of the pressing process, depending on the result.
  • Validity is divided, in particular, the initiation of an automatic correction of the punch stroke by the electronic control in dependence on the valency of the respective tolerance range, which is associated with the actual measurement.
  • the detection of the dimensions of the molding can be made without contact or with contact to the molding. It is important, however, that the detection of one or more tolerance-critical dimensions of the molding in the test station is not affected by vibrations from the press. This is ensured by the vibration isolation of the test station from the press.
  • a central control which is equipped with a memory for storing press operating parameters, pressing tool parameters and set and actual state variables of the blanks.
  • the central control and the memory may be part of the press, the pressing tool, the test station or one of the coupled control device.
  • a test station which is arranged externally of the press and has a weighing device and one or more measuring devices for tolerance-critical dimensions.
  • the press external testing station is not mechanically connected to the press and thus protected against interference by the press.
  • the pressed moldings are automatically fed directly after pressing. This can be done for example with a conveyor belt or preferably with a pick-place handling system or the like.
  • the handling system is particularly suitable for positioning accurate positioning for the measurement of tolerance-critical dimensions.
  • With the weighing device the weight of the molding to determine its density can be determined. It is expedient to equip the inspection station for the acquisition of several dimensions with more than one measuring device. Thus, several dimensions can be determined simultaneously, which has a positive effect on the cycle time of the test station.
  • the testing station has an automatic cleaning device for the weighing device and / or the measuring device.
  • the cleaning device can remove particles lost from moldings in the measuring station by blowing off, sucking off or mechanically wiping them off.
  • an accurate determination of its tolerance-critical dimensions is thus also possible, since an inclined position of the molded article is excluded in determining the dimensions.
  • the inspection station has a sorting device for the blanks.
  • the sorting device With the sorting device, the moldings, after determining weight and / or tolerance critical dimension and assignment to one of the tolerance ranges, depending on the valency of the tolerance range in which they fall, be sorted out automatically. For example, moldings which can not be assigned any of the specified tolerance ranges can be sorted out of the production lot simply and reliably.
  • the punch stroke is changed such that the dimensions of the next but one molding are closer to the nominal value for the molding, preferably a tolerance range can be assigned, which has a lower valency compared to the currently measured molding.
  • the scheme does not start only when a number of moldings is not in order.
  • the control is used even in the case of deviations which are still within the limits, in particular in a tolerance range with noncritical significance.
  • the dimensions of the molding are permanently changed step by step by changing the Stempelhubes from a tolerance range with critical valence to a tolerance range with less critical valence, in particular with the desired uncritical significance, so that the dispersion of the established dimensions of the moldings in the production lot is significantly reduced.
  • the method no correction of the punch stroke in the assignment of the respective instruments to a first tolerance range, a correction of the punch stroke in the assignment of the respective dimensions to a second, adjacent to the first tolerance range tolerance range, and stopping the Stempelhubes at any assignment of respective dimensions introduced to the first or second tolerance range.
  • the first tolerance range is the narrower tolerance range around the nominal value for the molding.
  • the first tolerance range is understood as a target tolerance range when pressing the blank, with the aim being that the random scattering comes to lie one to two times the standard deviation of the Gauskurve within this tolerance range. A correction of the punch stroke is not necessary for this case and therefore not provided.
  • the first tolerance range is followed by a second tolerance range with a higher priority, which reaches up to the specified permissible limit value. Dimensions which can not be assigned to the first or second tolerance range are not permitted, so that the punch stroke is stopped in this case, since a number of process parameters usually have to be changed to correct them.
  • the dimensional change can be effected by adapting a single process parameter, namely by correcting the punch stroke.
  • the second tolerance range is subdivided into a first action area adjoining the first tolerance area and an adjoining second action area.
  • the second action area is assigned a higher priority than the first action area, wherein each measure assigned to the second action area effects an immediate correction and a plurality, preferably three, measures associated with the first action area result in a correction of the punch stroke. If the correction of the punch stroke does not improve the dimensional accuracy of the blanks, further measures are required.
  • first several, preferably three, subsequent moldings are measured to determine whether it is a systematic or random effect. If this is a systematic influence that causes the first action area to be assigned to several pieces in succession, then the punch stroke is corrected to affect the dimensions of subsequent moldings in the direction of the first tolerance range.
  • warning can be signaled optically and / or acoustically.
  • further measures to improve the dimensional stability can be initiated to reduce the dispersion of the dimensions of the moldings in the production lot.
  • molded articles with dimensions which extend beyond the second action range are automatically sorted out after the test procedure.
  • critical moldings are removed from the manufacturing process in order to save unnecessary costs for a subsequent sintering process with or without subsequent sizing presses.
  • the proposed procedure will perform an automatic 100% automatic correction check on the lot, eliminating the need for sampling and eliminating rejects.
  • a powder press 1 according to the invention shown symbolically, with a pressing tool 2, has an upper punch 3 and a lower punch 4, which can be moved into a die 5.
  • the die 5 contains a mold 6 for a molding 7, which is already pressed and demolded in the figure.
  • An immediately before pressed molding 7 is inserted in a decoupled from the press 1 test station 8.
  • a symbolically illustrated measuring device 9 in particular for the height, the molding 7 is measured in the axial direction.
  • an automatic weighing process can be carried out there.
  • the detected tolerance-critical measured values 22 are stored in a memory 10 of a controller 11 of an operating device 12 of the press 1. With the controller 11, the punch stroke of the upper punch 3 and the lower punch 4 can be influenced.
  • a gripper 13 is provided for automatic displacement of the molding 7 from the press tool 2 arranged in the press 1 to the test station 8.
  • the test station 8 is still equipped with a cleaning device 14 in the form of a blowing device, which cleans a measuring receptacle 15 for the molding to be measured 7 before supplying a molding 7 of powder residues.
  • the same or a further cleaning device 14 can also clean the weighing device.
  • FIG. 2 shows a flow diagram of the method according to the invention for controlling a powder press 1.
  • predetermined nominal dimensions 20 and predetermined Eckstructureen 23 limit dimensions 21 are determined for the molding 7, which are limited to the Eckhenen 23.
  • first and second tolerance ranges 16, 17 and action areas 18, 19 set for the second tolerance range 17, and the punch stroke of the punch 3, 4 of the pressing tool 2 determined.
  • the dimensions are assigned to the first tolerance range 16 or the second tolerance range 17, in particular a first action range 18 or a second action range 19 of the second tolerance range 17, depending on their deviation from the desired value 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Powder Metallurgy (AREA)
  • Control Of Presses (AREA)
EP07003955.7A 2007-02-27 2007-02-27 Procédé pour la commande d'une presse à poudre fabricant des pièces brutes Active EP1964664B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07003955.7A EP1964664B1 (fr) 2007-02-27 2007-02-27 Procédé pour la commande d'une presse à poudre fabricant des pièces brutes
US12/035,651 US7774092B2 (en) 2007-02-27 2008-02-22 Process for the press control of a powder metal press in the production of moldings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07003955.7A EP1964664B1 (fr) 2007-02-27 2007-02-27 Procédé pour la commande d'une presse à poudre fabricant des pièces brutes

Publications (2)

Publication Number Publication Date
EP1964664A1 true EP1964664A1 (fr) 2008-09-03
EP1964664B1 EP1964664B1 (fr) 2013-11-20

Family

ID=38230043

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07003955.7A Active EP1964664B1 (fr) 2007-02-27 2007-02-27 Procédé pour la commande d'une presse à poudre fabricant des pièces brutes

Country Status (2)

Country Link
US (1) US7774092B2 (fr)
EP (1) EP1964664B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012004936A1 (de) 2012-02-28 2013-08-29 Ulrich Viebahn Kunststoff-Pressstation sowie Verfahren zur Herstellung von Kunststoffteilen mittels einer solchen Pressstation
EP2851188A1 (fr) * 2013-09-22 2015-03-25 Dorst Technologies GmbH & Co. KG Agencement de presse et dispositif de manipulation de l'agencement de presse
DE102018107637A1 (de) 2018-03-29 2019-10-02 Dorst Technologies Gmbh & Co. Kg Kalibrierverfahren

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103639410B (zh) * 2013-11-28 2015-07-01 山西中泰源工业自动化设备有限公司 用于磁性材料压铸成型的机器人系统中的模具整理工作台

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2264247A1 (de) 1972-12-30 1974-07-11 Krupp Gmbh Verfahren zur herstellung von formlingen
GB1475272A (en) * 1974-06-28 1977-06-01 Kilian & Co Gmbh Rotary tablet press
US4354811A (en) 1980-07-22 1982-10-19 Westinghouse Electric Corp. Workpiece pellet length control apparatus
JPS6160296A (ja) * 1984-08-30 1986-03-27 Yoshitsuka Seiki:Kk 全自動粉末成形プレス
JPS62280302A (ja) * 1986-05-29 1987-12-05 Sumitomo Electric Ind Ltd 粉末成形プレスにおける材料充填量の自動調整装置
DE19717217C2 (de) 1997-04-24 1999-12-02 Fette Wilhelm Gmbh Verfahren und Vorrichtung zur Herstellung von Preßlingen aus Hartmetall, Keramik, Sintermetall oder dergleichen
EP1287977A2 (fr) * 2001-08-31 2003-03-05 Fette GmbH Procédé et dispositif pour minimaliser la dispersion des forces maximales dans une presse à poudre
EP1602421A1 (fr) * 2004-06-02 2005-12-07 Maschinenfabrik Lauffer GmbH & Co. KG Presse de calibrage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5628650B2 (fr) * 1973-06-18 1981-07-03
DE3530681A1 (de) * 1985-08-28 1987-03-05 Passavant Werke Verfahren und vorrichtung zur erzeugung von formlingen gleichbleibender rohdichte und abmessungen
DE4322775A1 (de) * 1993-07-08 1995-01-12 Schuler Gmbh L Mehrständerpresse o. dgl. Pressenanlage zum Formen von Blechteilen
DE19527147A1 (de) * 1994-10-10 1996-04-11 Laeis & Bucher Gmbh Verfahren und Vorrichtung zur Qualitätsprüfung von Formteilen
US6859756B2 (en) * 2002-09-06 2005-02-22 Red X Holdings Llc Diagnostic method for manufacturing processes

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2264247A1 (de) 1972-12-30 1974-07-11 Krupp Gmbh Verfahren zur herstellung von formlingen
GB1475272A (en) * 1974-06-28 1977-06-01 Kilian & Co Gmbh Rotary tablet press
US4354811A (en) 1980-07-22 1982-10-19 Westinghouse Electric Corp. Workpiece pellet length control apparatus
JPS6160296A (ja) * 1984-08-30 1986-03-27 Yoshitsuka Seiki:Kk 全自動粉末成形プレス
JPS62280302A (ja) * 1986-05-29 1987-12-05 Sumitomo Electric Ind Ltd 粉末成形プレスにおける材料充填量の自動調整装置
DE19717217C2 (de) 1997-04-24 1999-12-02 Fette Wilhelm Gmbh Verfahren und Vorrichtung zur Herstellung von Preßlingen aus Hartmetall, Keramik, Sintermetall oder dergleichen
EP1287977A2 (fr) * 2001-08-31 2003-03-05 Fette GmbH Procédé et dispositif pour minimaliser la dispersion des forces maximales dans une presse à poudre
EP1602421A1 (fr) * 2004-06-02 2005-12-07 Maschinenfabrik Lauffer GmbH & Co. KG Presse de calibrage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012004936A1 (de) 2012-02-28 2013-08-29 Ulrich Viebahn Kunststoff-Pressstation sowie Verfahren zur Herstellung von Kunststoffteilen mittels einer solchen Pressstation
EP2851188A1 (fr) * 2013-09-22 2015-03-25 Dorst Technologies GmbH & Co. KG Agencement de presse et dispositif de manipulation de l'agencement de presse
DE102013110458A1 (de) * 2013-09-22 2015-03-26 Dorst Technologies Gmbh & Co. Kg Pressenanordnung und Pressenanordnungs-Handhabungsvorrichtung
DE102018107637A1 (de) 2018-03-29 2019-10-02 Dorst Technologies Gmbh & Co. Kg Kalibrierverfahren

Also Published As

Publication number Publication date
US7774092B2 (en) 2010-08-10
US20080206384A1 (en) 2008-08-28
EP1964664B1 (fr) 2013-11-20

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