EP0567606A1 - Process for controlling and/or regulating the moulding process carried out by a block machine. - Google Patents

Process for controlling and/or regulating the moulding process carried out by a block machine.

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Publication number
EP0567606A1
EP0567606A1 EP92920609A EP92920609A EP0567606A1 EP 0567606 A1 EP0567606 A1 EP 0567606A1 EP 92920609 A EP92920609 A EP 92920609A EP 92920609 A EP92920609 A EP 92920609A EP 0567606 A1 EP0567606 A1 EP 0567606A1
Authority
EP
European Patent Office
Prior art keywords
pressing process
pressing
pressed
pressure
press
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
EP92920609A
Other languages
German (de)
French (fr)
Other versions
EP0567606B1 (en
Inventor
Hans Ulrich Hauser
Hans Joachim Zenner
Martin Mick
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.)
Laeis Bucher GmbH
Original Assignee
Laeis Bucher 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 Laeis Bucher GmbH filed Critical Laeis Bucher GmbH
Publication of EP0567606A1 publication Critical patent/EP0567606A1/en
Application granted granted Critical
Publication of EP0567606B1 publication Critical patent/EP0567606B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • B28B17/0063—Control arrangements
    • B28B17/0081—Process control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • B28B17/02—Conditioning the material prior to shaping
    • B28B17/026—Conditioning ceramic materials
    • 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
    • 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
    • B30B15/304—Feeding material in particulate or plastic state to moulding presses by using feed frames or shoes with relative movement with regard to the mould or moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/32—Discharging presses

Definitions

  • the invention relates to a method and a device for controlling and / or regulating the pressing process of a stone press for producing moldings from free-flowing masses, in particular refractory, ceramic masses, with a measuring and comparison device for determining
  • a Schiagspindelpress is known, in which the path of the press ram is measured at the end of the press stroke with the aid of a sensor.
  • the sensor is with. connected to a measuring and comparison device, in which the determined actual dimension of the stone thickness is compared with the target dimension of the molding to be pressed and used as a signal to switch off the press.
  • a subsequent measuring stroke of the press ram determines a second actual dimension after the molding has been expanded, which is also compared in the measuring and comparison device with the target dimension of the molding.
  • the dimension of this deviation is used for the correction of the form-filling quantity of the following pressing process. In this way, the manufacturing process can be controlled with relatively low reject rates.
  • Additives that are added to the mold filling compound prior to pressing have become unusable or irreversibly hardened as a result of the pressing process. These additives have to be reprocessed after reprocessing the rejects application of the shredded material can be added to the mold filling compound again. In addition, the additives that have become unusable are contained as foreign bodies in the molding compound and contaminate them. The consequence of this is a reduction in the quality of the finished product. In any case, the return of material would involve increased effort.
  • the invention is based on the object of avoiding the disadvantages mentioned and further optimizing the production process, so that early detection of any defects which may occur is possible before decisive irreversible changes have occurred in the material to be pressed.
  • this object is achieved by measuring the pressing pressure and the pressing path from the beginning of the pressing process and comparing it with one or more predetermined pressure / path soli values or a pressing curve, with a tolerance range lying outside
  • Pressing process can be used.
  • the decision to end the pressing process prematurely is made at an early point in time at which no irreversible processes in the material to be pressed have yet taken place are that have a quality-reducing influence on the end product.
  • the deviations from the pressure / displacement setpoint determined at the end of the pressing process which are outside the range and within the tolerance range, are used to correct the mold filling quantity of the following pressing process . If the pressing process ends prematurely, the determined deviations from the pressure / displacement setpoint are extrapolated to the end of the pressing process and used to correct the mold filling quantity of the following pressing process.
  • the pressing process is terminated if there are deviations from the pressure / displacement tolerance value at the latest at a pressing force that corresponds to the maximum pressing force for one cavity.
  • the rejects are comminuted or crumbled and then the crumb mass is returned to the material to be pressed.
  • the crumb mass is immediately fed into the feed to the press after the crumbling of the mold filling compound and after its enrichment with additives added.
  • the broke molding is introduced into a comminution device and the comminuted crumb mass is passed into a collecting container, which is arranged above a conveyor belt and viewed in the conveying direction of the conveyor belt in front of a material container containing the material to be pressed.
  • the comminuted crumb mass can be sprinkled into a material container containing the material to be pressed, or can be placed in such a way that a partial mixing of the crumb mass with the material takes place automatically after the material has been removed by the conveyor belt.
  • the advantages achieved by the invention consist in particular in that the detection of the pressing path and the pressing pressure enables early detection of rejects with the consequence of the immediate press shutdown. At this stage of the press process, the reject molding is in a state that allows for safe recycling for the quality of the end product. As a result, manufacturing costs can be reduced while the quality of the end product remains the same by avoiding landfill material and saving cycle time.
  • the method according to the invention also offers protection against overloading of the press mold, which can occur, for example, when the press cavity is overfilled.
  • the known regulation of the filling quantity can be supplemented with a few additional steps.
  • FIG. 1 is a schematic representation of a
  • Fig. 2 is a schematic representation of the control of the pressing process.
  • a hydraulically operated stone press 1 with a fixed lower die 2, a movable upper punch 3 and a movable mold 5 guided on vertical columns 4 is shown.
  • the material 6 to be pressed which consists of a granular or powdery, primarily ceramic mass, is fed via a conveying line 7 to a material container 8.
  • a conveying line 7 to a material container 8.
  • 6 different additives were added to the material to improve the physical and chemical properties.
  • the underside of the material container 8 is formed by a conveyor belt 9 with which the material 6 is fed to a metering device 10. With the aid of the horizontally displaceable metering device 10, the material 6 is introduced into the mold 5.
  • the pressing process is initiated and the upper die 3 is moved downward.
  • the mold 5 is also lowered by a smaller amount, as shown schematically in FIG. 2.
  • the pressed molding 11 is made by Absen ken the mold 5 removed and extended on a horizontal table 12 with the help of a discharge device 13 from the mold 5 and transported away (Fig. 1).
  • the pressing path 14 and the pressing pressure 15 of the stone press 1 are also monitored (FIG. 2).
  • the pressing path 14 is continuously measured by a sensor (not shown), which is arranged on the stone press 1 in a known manner, and passed on to a measuring and comparison device 16.
  • the pressing pressure 15 is also measured in a known manner and passed on to the measuring and comparison device 16.
  • the measured values are recorded by a recording member 17 and compared in a further device 18 with a predetermined pressing curve 19, which represents the relationship between the pressing pressure 15 and the pressing path 14 as the desired value.
  • Comminution device 25 is introduced (Fig. 1).
  • the structure of the reject molding 24 is still relatively soft and loose, so that it can be comminuted or crumbled in the comminution device 25 with little effort.
  • the crumb mass 28 is passed from the shredding device 25 into a collecting container 27, which is arranged in front of the material container 8, as seen in the conveying direction of the conveyor belt 9.
  • the crumb mass 28 is poured onto the running conveyor belt 9 in a certain dosage and mixed with the material 6.
  • the mixing of crumb mass 28 and material 6 is selected in a technologically acceptable ratio in order to achieve a uniform distribution and mixing of the crumb mass 28, which can differ somewhat from material 6 in terms of its composition and grain size. It is not necessary to add additives to the crumb mass 28, since these substances are still present in the reject molding 24 without impairing their effectiveness due to the premature termination of the pressing process.
  • the crumb mass 28 can also be sprinkled via a branch line 34 directly into the material container 8, so that a partial mixing of the crumb mass 28 with the material to be compressed 6 takes place automatically after the material has been removed by the conveyor belt 9.
  • a further advantageous application of the method according to the invention is provided in that the press pressure is switched off automatically when an overload of the press mold as a result of an excessive press pressure is indicated during monitoring.
  • irregularities in the filling of the mold cavity often result, which lead to an increased pressing pressure.
  • Press pressure is exerted on the cavity with the largest filling quantity.
  • the consequence of this is that the wall of the cavity and / or the press temperature are overloaded and damaged. This leads to costly repairs combined with a loss of production.
  • the pressure / displacement curve also does not correspond to the normal course in such situations, according to the invention the pressing pressure is also switched off prematurely in the event of deviations from the desired value or from the predetermined pressing curve 19 and the pressing process is ended. This results in a simple way an advantageous form securing, which was previously only possible by the mostly electronic measurement of the tension in the stamp or on other pressing elements with a corresponding effort and often without sufficient reliability.
  • the rejects resulting from the premature termination of the pressing process are returned to the work cycle in the same way as already described.
  • the method according to the invention also permits the regulation of the mold filling quantity 29, the size of which determines the final dimension of the height or thickness of the molding 11 (FIG. 2). If the comparison carried out in the measuring and comparison device 16 at the end of the pressing process yields deviations from the specified pressing curve 19, then a tax is used on the basis of these deviations! line 30, which leads to a controller 31 and an actuator 32, a correction of the mold filling quantity 29 is carried out for the following pressing process. If the pressing process ends prematurely, the deviations determined, which have led to the pressing process, are extrapolated to the end of the pressing process and used to correct the mold filling quantity 29 for the following pressing process.
  • the mold filling quantity 29 is regulated in a known manner with the aid of a filling quantity adjusting device 33. The change in the mold filling quantity can be achieved, for example, by moving the mold 5 upwards or downwards.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Manufacturing & Machinery (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Processing Of Solid Wastes (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

PCT No. PCT/CH92/00200 Sec. 371 Date Jul. 15, 1993 Sec. 102(e) Date Jul. 15, 1993 PCT Filed Oct. 2, 1992 PCT Pub. No. WO93/09939 PCT Pub. Date May 27, 1993.A brick press for the production of formed bodies from free-flowing materials has a measuring and comparison device, in which pressing force and press path are detected from the beginning of the pressing process and are compared with a preset pressure curve, which represents the pressure/path setpoint value of the pressing process. Any deviations from the force/path setpoint value determined outside a range of tolerance of pressure curve are used as a signal for early ending of the pressing process. Reject formed bodies resulting in this case can be crushed effortlessly and again recycled in the initial material to be pressed without subsequent treatment. A process is also disclosed for the control and regulation of the pressing process.

Description

Verfahren zur Steuerung und/oder Regelung des Pressvorσanσes einer Steinpresse. Process for controlling and / or regulating the pressing process of a stone press.
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Steuerung und/oder Regelung des Pressvorganges einer Steinpresse zur Herstellung von Formungen aus rieselfähigen Massen, insbesondere feuerfeste, keramische Massen, mit einer Mess- und Vergleichseinrichtung zur Ermittlung vonThe invention relates to a method and a device for controlling and / or regulating the pressing process of a stone press for producing moldings from free-flowing masses, in particular refractory, ceramic masses, with a measuring and comparison device for determining
Sollwert-Abweichungen der Pressparameter, die zur Steuerung des Pressvorganges verwendet werden. Setpoint deviations of the pressing parameters that are used to control the pressing process.
Durch die DE-OS 40 09 608 ist eine Schiagspindelpresse bekannt, bei welcher der Weg des Presstempels am Ende des Presshubes mit Hilfe eines Messwertgebers gemessen wird. Der Messwertgeber ist mit. einer Mess- und Vergleichseinrichtung verbunden, in welcher das ermittelte Istmass der Steindicke mit dem Sollmass des zu pressenden Formlings verglichen und als Signal zum Abschalten der Presse verwendet wird. Durch einen anschliessenden Messhub des Presstempels wird nach erfolgter Ausdehnung des Formlings ein zweites Istmass ermittelt, das in der Mess- und Vergleichseinrichtung ebenfalls mit dem Sollmass des Formlings verglichen wird. From DE-OS 40 09 608 a Schiagspindelpress is known, in which the path of the press ram is measured at the end of the press stroke with the aid of a sensor. The sensor is with. connected to a measuring and comparison device, in which the determined actual dimension of the stone thickness is compared with the target dimension of the molding to be pressed and used as a signal to switch off the press. A subsequent measuring stroke of the press ram determines a second actual dimension after the molding has been expanded, which is also compared in the measuring and comparison device with the target dimension of the molding.
Ergeben sich dabei Werte, die vom Sollmass abweichen, so wird das Mass dieser Abweichung für die Korrektur der FormFülimenge des folgenden Pressvorganges verwendet . Auf diese Weise lässt sich der Hersteliungsprozess mit relativ geringen Ausschussquoten steuern.  If this results in values that deviate from the nominal dimension, the dimension of this deviation is used for the correction of the form-filling quantity of the following pressing process. In this way, the manufacturing process can be controlled with relatively low reject rates.
Liegt die am Ende des Pressvorganges festgestellte Abweichung vom Sollmass ausserhaib des Toleranzbereiches, so ist der bereits fertiggestellte Formung Ausschuss und nicht mehr zu gebrauchen. Im Zuge von Recyciing-Massnahmen wäre es wünschenswert, die Ausschuss-Formlinge durch Aufbereitung wieder dem Hersteliungsprozess zuzuführen und die zerkleinerte Masse in die Form einzufüllen. Dabei ergeben sich aber verschiedene Probleme. Der fertiggepresste If the deviation from the nominal dimension determined at the end of the pressing process lies outside the tolerance range, then the already finished shaping is reusable and can no longer be used. In the course of recycling measures, it would be desirable to reprocess the rejects into the manufacturing process and to fill the shredded mass into the mold. However, there are various problems. The pressed one
Ausschuss-Formung ist sehr hart und lässt sich nur mit einem relativ hohen Kosten- und Zeitaufwand zerkleinern. Ein weiterer, erheblicher Nachteil besteht darin, dass Reject formation is very hard and can only be shredded with a relatively high cost and time. Another significant disadvantage is that
Zusatzstoffe, die der Formfüllmasse vor dem Pressen zugegeben werden, durch den Pressvorgang unbrauchbar geworden bzw. irreversibel ausgehärtet sind. Diese Zusatzstoffe müssen nach der Aufbereitung der Ausschuss-Formlinge bei Wiederver wendung des zerkleinerten Gutes erneut der Formfüllmasse beigemischt werden. Hinzu kommt, dass die unbrauchbar gewordenen Zusatzstoffe als Fremdkörper in der Formfüllmasse enthalten sind und diese verschmutzen. Die Folge davon ist eine Qualitätsminderung des Fertigprodukts. In jedem Fall wäre die Materialrückführung mit einem erhöhten Aufwand verbunden. Additives that are added to the mold filling compound prior to pressing have become unusable or irreversibly hardened as a result of the pressing process. These additives have to be reprocessed after reprocessing the rejects application of the shredded material can be added to the mold filling compound again. In addition, the additives that have become unusable are contained as foreign bodies in the molding compound and contaminate them. The consequence of this is a reduction in the quality of the finished product. In any case, the return of material would involve increased effort.
Der Erfindung liegt die Aufgabe zugrunde, die genannten Nachteile zu vermeiden und den Hersteliungsprozess weiter zu optimieren, so dass eine Früherkennung eventuell auftretender Mängel möglich wird, bevor entscheidende irreversible Veränderungen in dem zu pressenden Material aufgetreten sind. The invention is based on the object of avoiding the disadvantages mentioned and further optimizing the production process, so that early detection of any defects which may occur is possible before decisive irreversible changes have occurred in the material to be pressed.
Gemäß der Erfindung wird diese Aufgabe daurch gelöst, dass der Pressdruck und der Pressweg vom Anfang des Pressvorganges an gemessen und mit einem oder mehreren vorgegebenen Druck/Weg-Soliwerten bzw. einer Presskurve verglichen werden, wobei ausserhaib eines Toleranzbereiches liegende According to the invention, this object is achieved by measuring the pressing pressure and the pressing path from the beginning of the pressing process and comparing it with one or more predetermined pressure / path soli values or a pressing curve, with a tolerance range lying outside
Abweichungen als Signal zur vorzeitigen Beendigung des Deviations as a signal for the premature termination of the
Pressvorganges verwendet werden. Pressing process can be used.
Nach einem weiteren Merkmal der Erfindung wird der Entscheid zur vorzeitigen Beendigung des Pressvorganges zu einem so frühzeitigen Zeitpunkt getroffen, zu dem noch keine irreversiblen Vorgänge in dem zu pressenden Material abgelaufen sind, die einen quaiitätsmindernden Einfluss auf das Endprodukt ausüben. According to a further feature of the invention, the decision to end the pressing process prematurely is made at an early point in time at which no irreversible processes in the material to be pressed have yet taken place are that have a quality-reducing influence on the end product.
Um auch mit diesem Verfahren die richtige Form-Füllmenge für den folgenden Pressvorgang bestimmen zu können, werden die in bekannter Weise am Ende des Pressvorganges ermittelten, ausserhaib und innerhalb des Toleranzbereiches liegenden Abweichungen vom Druck/Weg-Sollwert zur Korrektur der FormFüllmenge des folgenden Pressvorganges verwendet. Bei vorzeitiger Beendigung des Pressvorganges werden die ermittelten Abweichungen vom Druck/Weg-Sollwert auf das Ende des Pressvorganges hochgerechnet und zur Korrektur der FormFüllmenge des folgenden Pressvorganges verwendet. In order to be able to determine the correct mold filling quantity for the following pressing process using this method, the deviations from the pressure / displacement setpoint determined at the end of the pressing process, which are outside the range and within the tolerance range, are used to correct the mold filling quantity of the following pressing process . If the pressing process ends prematurely, the determined deviations from the pressure / displacement setpoint are extrapolated to the end of the pressing process and used to correct the mold filling quantity of the following pressing process.
Um bei Pressformen mit mehreren Kavitäten eine Überlastung einzelner Kavitäten, beispielsweise infolge ungleicnmassiger Befüllung, zu vermeiden, erfolgt die Beendigung des Pressvorganges bei Abweichungen vom Druck/Weg-Toleranzwert spätestens bei einer Presskraft, die der maximalen Presskraft für eine Kavität entspricht. In order to avoid overloading individual cavities in molds with several cavities, for example as a result of improper filling, the pressing process is terminated if there are deviations from the pressure / displacement tolerance value at the latest at a pressing force that corresponds to the maximum pressing force for one cavity.
Zur Wiederverwendung des Materials von Ausschuss-Formlingen, die durch die vorzeitige Beendigung des Pressvorganges entstanden sind, wird der Ausschuss-Formling zerkleinert bzw. zerkrümelt und anschliessend die Krümelmasse dem zu verpressenden Material wieder zugeführt. In order to reuse the material from rejects which have arisen due to the premature termination of the pressing process, the rejects are comminuted or crumbled and then the crumb mass is returned to the material to be pressed.
Zur gleichmässigen Verteilung der Krümelmasse in dem zu verpressenden Material wird die Krümelmasse in einer For even distribution of the crumb mass in the to pressing material is the crumb mass in one
bestimmten, technologisch günstigen Dosierung dem zu verpressenden Material während der Zuführung zur Presse kontinuierlich beigegeben und mit diesem vermischt. certain, technologically favorable dosage continuously added to the material to be pressed during the feed to the press and mixed with it.
Da die Zusatzstoffe, die dem zu verpressenden Material beigefügt wurden, in der Krümelmasse des Ausschuss-Formlings bei vorzeitiger Beendigung des Pressvorganges noch unbeschadet vorhanden sind, wird die Krümelmasse sofort nach der Zerkrümeiung der Formfüllmasse und nach deren Anreicherung mit Zusatzstoffen unmittelbar in die Zuführung zur Presse beigegeben. Since the additives that have been added to the material to be pressed are still present in the crumb mass of the reject molding when the pressing process is ended prematurely, the crumb mass is immediately fed into the feed to the press after the crumbling of the mold filling compound and after its enrichment with additives added.
Gemäss einem vorteilhaften Ausführungsbeispiel der Erfindung wird der Ausschuss-Formling in eine Zerkieinerungsvorrichtung eingebracht und die zerkleinerte Krümelmasse in einen Sammelbehälter geleitet, der oberhalb eines Förderbandes und in Förderrichtung des Förderbandes gesehen vor einem das zu verpressende Material enthaltenden Materiaibehälter angeordnet ist. According to an advantageous embodiment of the invention, the broke molding is introduced into a comminution device and the comminuted crumb mass is passed into a collecting container, which is arranged above a conveyor belt and viewed in the conveying direction of the conveyor belt in front of a material container containing the material to be pressed.
Nach einem weiteren Merkmal der Erfindung kann die zerkleinerte Krümelmasse in einen das zu pressende Material enthaltenden Materialbehälter mitteis geeigneter Vorrichtung eingestreut bzw. so aufgegeben werden, dass eine Teil-Vermischung der Krümelmasse mit dem Material nach Abzug des Materials durch das Förderband selbsttätig erfolgt ist. Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, dass durch die Erfassung des Pressweges und des Pressdruckes bereits am Anfang des Pressvorganges eine Früherkennung von Ausschuss-Formiingen mit der Konsequenz der sofortigen Pressenabschaltung ermöglicht wird. In diesem Stadium des Pressenvorganges befindet sich der AusschussFormling in einem Zustand, der ein für die Qualität des Endproduktes bedenkenloses Recycling zulässt. Dadurch können die Herstelikosten bei gleichbleibender Qualität des Endprodukts gesenkt werden, indem Deponiematerial vermieden und Zykluszeit eingespart werden. Das erfindungsgemässe Verfahren bietet ausserdem auch einen Schutz vor überbelastungen der Pressform, die beispielsweise bei Überfüllung der Presskavität auftreten können. Dies gilt insbesondere für Pressformen mit mehreren, nebeneinander angeordneten Presskavitäten. Bei Überfüllung einer Kavität würde sich am Anfang des Pressvorganges der gesamte Pressdruck auf diese eine Kavität auswirken, während die anderen Kavitäten nahezu drucklos wären. In diesem Fall können Beschädigungen der Kavität nur durch vorzeitiges Abschalten der Presse bzw. des Pressdruckes verhindert werden. Gleichzeitig kann mit wenigen zusätzlichen Schritten die an sich bekannte Regelung, der Füllmenge ergänzt werden. According to a further feature of the invention, the comminuted crumb mass can be sprinkled into a material container containing the material to be pressed, or can be placed in such a way that a partial mixing of the crumb mass with the material takes place automatically after the material has been removed by the conveyor belt. The advantages achieved by the invention consist in particular in that the detection of the pressing path and the pressing pressure enables early detection of rejects with the consequence of the immediate press shutdown. At this stage of the press process, the reject molding is in a state that allows for safe recycling for the quality of the end product. As a result, manufacturing costs can be reduced while the quality of the end product remains the same by avoiding landfill material and saving cycle time. The method according to the invention also offers protection against overloading of the press mold, which can occur, for example, when the press cavity is overfilled. This applies in particular to molds with several press cavities arranged side by side. If one cavity is overfilled, the entire pressing pressure would affect this one cavity at the start of the pressing process, while the other cavities would be almost depressurized. In this case, damage to the cavity can only be prevented by prematurely switching off the press or the pressing pressure. At the same time, the known regulation of the filling quantity can be supplemented with a few additional steps.
Die Erfindung ist in der folgenden Beschreibung und der Zeichnung, die ein Ausführungsbeispiel darstellt, näher erläutert. Es zeigen Fig. 1 eine schematische Darstellung einer The invention is explained in more detail in the following description and the drawing, which represents an exemplary embodiment. Show it Fig. 1 is a schematic representation of a
Steinpresse mit Material Zuführung und  Stone press with material feed and
Fig. 2 eine schematische Darstellung der Steuerung des Pressvorganges. Fig. 2 is a schematic representation of the control of the pressing process.
In Fig. 1 ist eine hydraulisch betätigte Steinpresse 1 mit einem feststehenden ünterstempei 2, einem beweglichen Oberstempel 3 und einer auf vertikalen Säulen 4 geführten, ebenfalls beweglichen Pressform 5 dargestellt. Das zu verpressende Material 6, das aus einer körnigen oder pulverförmigen, vornehmlich keramischen Masse besteht, wird über eine Förderieitung 7 einem Materiaibehälter 8 zugeführt. Zuvor wurden dem Material 6 verschiedene Zusatzstoffe zur Verbesserung der physikalischen und chemischen Eigenschaften beigemischt. Die Unterseite des Materiaibehälters 8 wird durch ein Förderband 9 gebildet, mit dem das Material 6 einer Dosiervorrichtung 10 zugeführt wird. Mit Hilfe der horizontal verschiebbaren Dosiervorrichtung 10 wird das Material 6 in die Pressform 5 eingebracht. In Fig. 1, a hydraulically operated stone press 1 with a fixed lower die 2, a movable upper punch 3 and a movable mold 5 guided on vertical columns 4 is shown. The material 6 to be pressed, which consists of a granular or powdery, primarily ceramic mass, is fed via a conveying line 7 to a material container 8. Previously, 6 different additives were added to the material to improve the physical and chemical properties. The underside of the material container 8 is formed by a conveyor belt 9 with which the material 6 is fed to a metering device 10. With the aid of the horizontally displaceable metering device 10, the material 6 is introduced into the mold 5.
Nach dem Befüll en der Pressform 5 wird der Pressvorgang eingeleitet und der Oberstempei 3 nach unten bewegt. Dabei wird zur gleichmässigen Verdichtung des Materials 6 auch die Pressform 5 um einen kleineren Betrag abgesenkt, wie in Fig. 2 schematisch dargestellt. Nach Beendigung des Pressvorganges wird der fertiggepresste Formung 11 durch Absen ken der Pressform 5 entformt und auf einem horizontalen Tisch 12 mit Hilfe einer Austragsvorrichtung 13 aus der Pressform 5 ausgefahren und abtransportiert (Fig. 1). After filling the mold 5, the pressing process is initiated and the upper die 3 is moved downward. In order to uniformly compress the material 6, the mold 5 is also lowered by a smaller amount, as shown schematically in FIG. 2. After the pressing process is finished, the pressed molding 11 is made by Absen ken the mold 5 removed and extended on a horizontal table 12 with the help of a discharge device 13 from the mold 5 and transported away (Fig. 1).
Mit dem Beginn des Pressvorganges erfolgt gleichzeitig auch eine Überwachung des Pressweges 14 und des Pressdruckes 15 der Steinpresse 1 (Fig. 2). Durch einen nicht dargestellten Messwertgeber, der in bekannter Weise an der Steinpresse 1 angeordnet ist, wird der Pressweg 14 ständig gemessen und an eine Mess- und Vergieichseinrichtung 16 weitergegeben. Der Pressdruck 15 wird ebenfalls in bekannter Weise gemessen und an die Mess- und Vergleichseinrichtung 16 weitergeleitet. Dort werden die gemessenen Werte durch ein Aufnahmeglied 17 erfasst und in einer weiteren Einrichtung 18 mit einer vorgegebenen Presskurve 19 verglichen, die das Verhältnis von Pressdruck 15 und Pressweg 14 als Sollwert darstellt. With the beginning of the pressing process, the pressing path 14 and the pressing pressure 15 of the stone press 1 are also monitored (FIG. 2). The pressing path 14 is continuously measured by a sensor (not shown), which is arranged on the stone press 1 in a known manner, and passed on to a measuring and comparison device 16. The pressing pressure 15 is also measured in a known manner and passed on to the measuring and comparison device 16. There, the measured values are recorded by a recording member 17 and compared in a further device 18 with a predetermined pressing curve 19, which represents the relationship between the pressing pressure 15 and the pressing path 14 as the desired value.
Ergibt der in der Mess- und Vergleichseinrichtung 16 durch-geführte Vergleich Abweichungen vom Druck/Weg-Sollwert bzw. von der vorgegebenen Presskurve 19, die ausserhaib eines Toleranzbereiches 20 liegen, so wird über ein Befehisgiied 21 der Mess- und Vergleichseinrichtung 16 und eine Steuerleitung 22, die zu einer Maschinensteuerung 23 führt, die Steinpresse 1 abgeschaltet und der Pressvorgang vorzeitig beendet. Dies hat zur Folge, dass ein Ausschuss-Formling 24 entsteht, der durch Abschwenken des Tisches 12 in eine If the comparison carried out in the measuring and comparison device 16 reveals deviations from the pressure / displacement setpoint value or from the predetermined pressing curve 19 which lie outside a tolerance range 20, then a command 21 of the measuring and comparison device 16 and a control line 22, which leads to a machine control 23, the stone press 1 is switched off and the pressing process is ended prematurely. The result of this is that a reject molding 24 is formed which, by pivoting the table 12 into a
Zerkleinerungsvorrichtung 25 eingebracht wird (Fig. 1). In diesem Stadium des Pressvorganges ist das Gefüge des Ausschuss-Formlings 24 noch relativ weich und locker, so dass er sich in der Zerkleinerungsvorrichtung 25 mit geringem Aufwand zerkleinern bzw. zerkrümeln lässt. Über eine Förderleitung 26 wird die Krümelmasse 28 von der Zerkieinerungsvorrichtung 25 in einen Sammelbehälter 27 geleitet, der in Förderrichtung des Förderbandes 9 gesehen vor dem Materialbehälter 8 angeordnet ist. Aus dem Sammelbehälter 27 wird die Krümelmasse 28 in einer bestimmten Dosierung auf das laufende Förderband 9 geschüttet und mit dem Material 6 vermischt. Dabei wird die Vermischung von Krümelmasse 28 und Material 6 in einem technologisch akzeptablen Verhältnis gewählt, um eine gleichmässige Verteilung und Vermischung der Krümelmasse 28, die hinsichtlich ihrer Zusammensetzung und Korngrösse vom Material 6 etwas abweichen kann, zu erreichen. Eine Zugabe von Zusatzstoffen zur Krümelmasse 28 ist nicht erforderlich, da diese Stoffe infolge der vorzeitigen Beendigung des Pressvorganges noch im Ausschuss-Formling 24 ohne Beeinträchtigung ihrer Wirksamkeit vorhanden sind. Comminution device 25 is introduced (Fig. 1). In At this stage of the pressing process, the structure of the reject molding 24 is still relatively soft and loose, so that it can be comminuted or crumbled in the comminution device 25 with little effort. Via a conveyor line 26, the crumb mass 28 is passed from the shredding device 25 into a collecting container 27, which is arranged in front of the material container 8, as seen in the conveying direction of the conveyor belt 9. From the collecting container 27, the crumb mass 28 is poured onto the running conveyor belt 9 in a certain dosage and mixed with the material 6. The mixing of crumb mass 28 and material 6 is selected in a technologically acceptable ratio in order to achieve a uniform distribution and mixing of the crumb mass 28, which can differ somewhat from material 6 in terms of its composition and grain size. It is not necessary to add additives to the crumb mass 28, since these substances are still present in the reject molding 24 without impairing their effectiveness due to the premature termination of the pressing process.
Die Krümelmasse 28 kann auch über eine Abzweigleitung 34 direkt in den Materialbehäi ter 8 eingestreut werden, so dass eine Teil-Vermischung der Krümeimasse 28 mit dem zu verpressenden Material 6 nach Abzug des Materials durch das Förderband 9 selbsttätig erfolgt ist. Eine weitere, vorteilhafte Anwendungsmöglichkeit des erfindungsgemässen Verfahrens ist dadurch gegeben, dass der Pressάruck automatisch abgeschaltet wird, wenn sich bei der Überwachung eine Überlastung der Pressform infolge eines überhöhten Pressdruckes anzeigt. In gewissen Phasen der Inbetriebnahme der Presse mit einer neuen Form oder einer neuen Materialcharge, beim Ausfahren einer Charge, bei Betriebsunterbrechungen etc. ergeben sich oftmals Unregelmässigkeiten bei der Befüllung der Formkavitat, die zu einem erhöhten Pressdruck führen. Dies gilt insbesondere für Pressformen mit mehreren, nebeneinander angeordneten Press- kavitäten. Beim Befüllen der Kavitäten kann es vorkommen, dass eine Kavität mit mehr Material als die benachbarte Kavität gefüllt wird. In diesem Fall wird der maximale The crumb mass 28 can also be sprinkled via a branch line 34 directly into the material container 8, so that a partial mixing of the crumb mass 28 with the material to be compressed 6 takes place automatically after the material has been removed by the conveyor belt 9. A further advantageous application of the method according to the invention is provided in that the press pressure is switched off automatically when an overload of the press mold as a result of an excessive press pressure is indicated during monitoring. In certain phases of the start-up of the press with a new mold or a new batch of material, when extending a batch, during business interruptions, etc., irregularities in the filling of the mold cavity often result, which lead to an increased pressing pressure. This applies in particular to press molds with several press cavities arranged next to one another. When filling the cavities, it can happen that one cavity is filled with more material than the neighboring cavity. In this case the maximum
Pressdruck auf die Kavität mit der grössten Fülimenge ausgeübt. Die Folge davon ist, dass die Wand der Kavität und/oder die Presstempei überlastet und beschädigt werden. Dies führt zu aufwendigen Reparaturen, verbunden mit einem Produktionsausfall. Da in solchen Situationen die Druck/WegKurve ebenfalls nicht dem normalen Verlauf entspricht, wird gemäss der Erfindung auch hier der Pressdruck bei Abweichungen vom Sollwert bzw. von der vorgegebenen Press-kurve 19 vorzeitig abgeschaltet und der Pressvorgang been-det. Dadurch ergibt sich auf einfache Art und Weise eine vorteilhafte Formsicherung, die bisher nur auf dem Wege der meist elektronischen Messung der Spannung im Presstempel oder an anderen Presselementen mit einem entsprechenden Aufwand und oftmals ohne ausreichende Zuverlässigkeit erreicht wurde. Die infolge der vorzeitigen Beendigung des Pressvorganges entstandenen Ausschussf orml inge werden in gleicher Weise wie bereits beschrieben in den Arbeitszyklus zurückgeführt. Press pressure is exerted on the cavity with the largest filling quantity. The consequence of this is that the wall of the cavity and / or the press temperature are overloaded and damaged. This leads to costly repairs combined with a loss of production. Since the pressure / displacement curve also does not correspond to the normal course in such situations, according to the invention the pressing pressure is also switched off prematurely in the event of deviations from the desired value or from the predetermined pressing curve 19 and the pressing process is ended. This results in a simple way an advantageous form securing, which was previously only possible by the mostly electronic measurement of the tension in the stamp or on other pressing elements with a corresponding effort and often without sufficient reliability. The rejects resulting from the premature termination of the pressing process are returned to the work cycle in the same way as already described.
Darüberhinaus gestattet das erfindungsgemässe Verfahren auch die Regulierung der Form-Füllmenge 29, von deren Grosse das Endmass der Höhe bzw. Dicke des Formlings 11 abhängt (Fig. 2). Ergibt der in der Mess- und Vergleichseinrichtung 16 am Ende des Pressvorganges durchgeführte Vergleich Abweichungen von der vorgegebenen Presskurve 19, so wird aufgrund dieser Abweichungen über eine Steuer! eitung 30, die zu einem Regler 31 und einem Stellglied 32 führt, eine Korrektur der FormFüllmenge 29 für den folgenden Pressvorgang durchgeführt. Bei vorzeitiger Beendigung des Pressvorganges werden die ermittelten Abweichungen, die zur Pressenabschaitung geführt haben, auf das Ende des Pressvorganges hochgerechnet und zur Korrektur der Form-Fülimenge 29 für den folgenden Pressvorgang verwendet. Die Regulierung der Form-Fülimenge 29 erfolgt in bekannter Weise mit Hilfe einer Füllmengenverstelleinrichtung 33. Die Änderung der Form-Fülimenge kann beispielsweise durch Verschieben der Pressform 5 nach oben oder nach unten erreicht werden. In addition, the method according to the invention also permits the regulation of the mold filling quantity 29, the size of which determines the final dimension of the height or thickness of the molding 11 (FIG. 2). If the comparison carried out in the measuring and comparison device 16 at the end of the pressing process yields deviations from the specified pressing curve 19, then a tax is used on the basis of these deviations! line 30, which leads to a controller 31 and an actuator 32, a correction of the mold filling quantity 29 is carried out for the following pressing process. If the pressing process ends prematurely, the deviations determined, which have led to the pressing process, are extrapolated to the end of the pressing process and used to correct the mold filling quantity 29 for the following pressing process. The mold filling quantity 29 is regulated in a known manner with the aid of a filling quantity adjusting device 33. The change in the mold filling quantity can be achieved, for example, by moving the mold 5 upwards or downwards.

Claims

P A T EN T A N S R Ü C H E PAT EN TANSRÜ CHE
1. Verfahren zur Steuerung und/oder Regelung des Press- vorganges einer Steinpresse zur Herstellung von Formungen aus rieselfähigen Massen, insbesondere feuerfeste, keramische Massen, mit einer Mess- und Vergleichseinrichtung zur Ermittlung von Sollwert-Abweichungen der Pressparameter, die zur Steuerung des Pressvorganges verwendet werden, dadurch gekennzeichnet, dass der Pressdruck (15) und der Pressweg (14) vom Anfang des Pressvorganges an gemessen und mit einem oder mehreren vorgegebenen Druck/ Weg-Sollwerten bzw. einer Presskurve (19) verglichen werden, wobei ausserhaib eines Toleranzbereiches (20) liegende Abweichungen als Signal zur vorzeitigen Beendigung des Pressvorganges verwendet werden. 1. Method for controlling and / or regulating the pressing process of a stone press for producing moldings from free-flowing masses, in particular refractory, ceramic masses, with a measuring and comparison device for determining setpoint deviations of the pressing parameters used to control the pressing process characterized in that the pressing pressure (15) and the pressing path (14) are measured from the beginning of the pressing process and compared with one or more predetermined pressure / displacement setpoints or a pressing curve (19), with the exception of a tolerance range (20 ) lying deviations are used as a signal for premature termination of the pressing process.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Entscheid zur vorzeitigen Beendigung des Pressvorganges zu einem so frühzeitigen Zeitpunkt getroffen wird, zu dem noch keine irreversiblen Vorgänge im zu pressenden Material abgelaufen sind, die einen qualitätsmindernden Einfluss auf das Endprodukt ausüben. 2. The method according to claim 1, characterized in that the decision to prematurely end the pressing process is made at an early point in time at which no irreversible processes in the material to be pressed have yet expired which have a quality-reducing influence on the end product.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die am Ende des Pressvorganges ermittelten, ausserhaib und innerhalb des Toleranzbereiches (20) der Press- kurve (19) liegenden Abweichungen vom Druck/Weg-Sollwert zur Korrektur der Form-Fülimenge (29) für den folgenden Pressvorgang verwendet werden. 3. The method according to claim 1 or 2, characterized in that the deviations from the pressure / displacement setpoint determined at the end of the pressing process, outside and within the tolerance range (20) of the pressing curve (19), for correcting the mold filling quantity ( 29) can be used for the following pressing process.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die bei vorzeitiger Beendigung des Pressvorganges ermittelten Abweichungen vom Druck/Weg-Sollwert auf das Ende des Pressvorganges hochgerechnet und zur Korrektur der Form-Füllmenge (29) des folgenden Pressvorganges verwendet werden. 4. The method according to claim 1, characterized in that the deviations from the pressure / displacement setpoint determined when the pressing process ends prematurely are extrapolated to the end of the pressing process and are used to correct the mold filling quantity (29) of the following pressing process.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass bei einer Pressform mit mehreren 5. The method according to any one of claims 1 to 4, characterized in that in a mold with several
Kavitäten die Beendigung des Pressvorganges infolge einer Abweichung vom Druck/Weg-Sollwert spätestens bei einer Presskraft erfolgt, die der maximalen Presskraft für eine Kavität entspricht.  Cavities the pressing process is terminated due to a deviation from the pressure / displacement setpoint at the latest at a pressing force that corresponds to the maximum pressing force for a cavity.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch 6. The method according to any one of claims 1 to 5, characterized
gekennzeichnet, dass der bei vorzeitiger Beendigung des Pressvorganges entstandene Ausschuss-Formling (24) zerkleinert bzw. zerkrümelt wird und anschliessend die Krümelmasse (28) dem zu verpressenden Material (6) wieder zugeführt wird. characterized in that the reject molding (24) formed upon premature termination of the pressing process is comminuted or crumbled and then the crumb mass (28) is fed back to the material (6) to be pressed.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die Krümelmasse (28) in einer bestimmten, technologisch günstigen Dosierung dem zu verpressenden Material (6) während der Zuführung zur Steinpresse (1) kontinuierlich beigegeben wird. 7. The method according to claim 6, characterized in that the crumb mass (28) in a certain, technologically favorable dosage the material to be pressed (6) during the supply to the stone press (1) is continuously added.
8. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Krümelmasse (28) sofort nach der Zerkrümelung der Formfüllmasse und nach deren Anreicherung mit Zusatzstoffen unmittelbar in die Zuführung zur Presse beigegeben wird. 8. The method according to claim 6 or 7, characterized in that the crumb mass (28) is added immediately after the crumbling of the molding compound and after its enrichment with additives directly into the feed to the press.
9. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der Ausschuss-Formling (24) in eine Zerkleinerungsvorrichtung (25) eingebracht und die zerkleinerte Krümelmasse (28) in einen Sammelbehälter (27) geleitet wird, der oberhalb eines Förderbandes (9) und in Förderrichtung des Förder- bandes gesehen vor einem das zu verpressende Material (6) enthaltenden Materialbehäl ter (8) angeordnet ist. 9. Device for performing the method according to one of claims 1 to 8, characterized in that the reject molding (24) is introduced into a comminution device (25) and the comminuted crumb mass (28) is passed into a collecting container (27) which Above a conveyor belt (9) and viewed in the direction of conveyance of the conveyor belt is arranged in front of a material container (8) containing the material to be pressed (6).
10.Vorrichtung nach einem der Ansprüche 1 bis 9 dadurch 10.Device according to one of claims 1 to 9
gekennzeichnet, dass die zerkleinerte Krümelmasse (28) in einen das zu verpressende Material (6) enthaltenden  characterized in that the crushed crumb mass (28) into a containing the material to be pressed (6)
Materiaibehälter (8) mittels geeigneter Vorrichtung eingestreut bzw. so aufgegeben wird, dass eine Teil-Vermischung der Krümelmasse (28) mit dem Material (6) nach Abzug des Materials durch das Förderband (9) selbsttätig erfolgt ist. Material container (8) is sprinkled in by means of a suitable device or is added in such a way that a partial mixing of the crumb mass (28) with the material (6) occurs Deduction of the material by the conveyor belt (9) has taken place automatically.
EP92920609A 1991-11-15 1992-10-02 Process for controlling and/or regulating the moulding process carried out by a block machine Expired - Lifetime EP0567606B1 (en)

Applications Claiming Priority (3)

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CH3336/91 1991-11-15
CH3336/91A CH683243A5 (en) 1991-11-15 1991-11-15 Method for controlling and / or regulating the pressing operation of a stone press.
PCT/CH1992/000200 WO1993009939A1 (en) 1991-11-15 1992-10-02 Process for controlling and/or regulating the moulding process carried out by a block machine

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CA2100660C (en) 2003-12-09
CN1073133A (en) 1993-06-16
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ATE123693T1 (en) 1995-06-15
UA34431C2 (en) 2001-03-15
CH683243A5 (en) 1994-02-15
JPH06504486A (en) 1994-05-26
DE59202550D1 (en) 1995-07-20
US5433903A (en) 1995-07-18
WO1993009939A1 (en) 1993-05-27
CA2100660A1 (en) 1993-05-16

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