EP0642918B1 - Dispositif de commande pour une presse à fabriquer des briques crues - Google Patents

Dispositif de commande pour une presse à fabriquer des briques crues Download PDF

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Publication number
EP0642918B1
EP0642918B1 EP94111269A EP94111269A EP0642918B1 EP 0642918 B1 EP0642918 B1 EP 0642918B1 EP 94111269 A EP94111269 A EP 94111269A EP 94111269 A EP94111269 A EP 94111269A EP 0642918 B1 EP0642918 B1 EP 0642918B1
Authority
EP
European Patent Office
Prior art keywords
path
pressing
ram
lower ram
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.)
Expired - Lifetime
Application number
EP94111269A
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German (de)
English (en)
Other versions
EP0642918A1 (fr
Inventor
Günter Dipl.-Ing. Hofmann
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.)
Langenstein and Schemann GmbH
Original Assignee
Langenstein and Schemann 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 Langenstein and Schemann GmbH filed Critical Langenstein and Schemann GmbH
Publication of EP0642918A1 publication Critical patent/EP0642918A1/fr
Application granted granted Critical
Publication of EP0642918B1 publication Critical patent/EP0642918B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • B28B3/08—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 with two or more rams per mould
    • 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
    • B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
    • B30B15/20—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram controlling the speed of the ram, e.g. the speed of the approach, pressing or return strokes

Definitions

  • the invention relates to a control of a stone molding press, in which a hydraulic piston-cylinder device acts on an upper punch and a lower punch and the upper punch and the lower punch work from below onto a mold filled with molding compound, and in which one Pre-compression of the molding compound is provided from below and for pressing the molding compound a movement of the upper die and a movement of the lower die is provided in each case by a pressing path, the pressing path of the upper die being smaller than the pressing path of the lower die and simultaneous movements of the upper die and the lower die is provided.
  • a control of this type is known with the exception (DE-A-2 612 167) that the press travel of the upper punch is not specified as being smaller than the press travel of the lower punch.
  • Stone molding presses and their control are known (DE-A-14 59 276, DE-A-28 31 166, DE-A-37 23 352).
  • the pressing paths are predetermined by end stops, which interact with the punches or the piston-cylinder devices, or predetermined by valve opening times, to which certain quantities of pressure fluid supplied and thus certain movement paths of the piston-cylinders Facilities.
  • the pressing path of the upper punch is shorter because mandrels protrude from below into the form, in front of which the upper punch stops.
  • the correct amount of molding compound to be entered into the mold for each stone molding can be set by pressure measurements during pressing.
  • the upper punch completes its pressing path at very short notice and is only given during this very short period of simultaneous movement of the upper stamp and lower stamp and the lower stamp continues to move after the upper stamp has come to a standstill in order to complete its pressing path.
  • the speeds of the movements of the upper stamp and lower stamp are uncontrolled. It can now be seen that the compression of the finished stone molding over its height, between the upper punch side and the lower punch side, is not satisfactorily uniform.
  • An object of the invention is therefore to provide a control of the type mentioned, on the basis of which the uniformity of the compression of the molding composition is improved over the height of the finished stone molding.
  • the control according to the invention is solving this problem, characterized in that a continuous path measurement is provided on the upper punch and on the lower punch and the movements of the upper punch and lower punch for pressing are continuously controlled using a computer in such a way that the different pressing paths are at the same speed at different speeds Time.
  • the finished stone molding has an improved uniformity of the compression over the height.
  • the upper stamp ends its press travel movement simultaneously with the lower stamp and moves relatively slowly relative to the lower stamp.
  • the highest possible speed of the lower punch is selected.
  • the path control is important for the improved stone quality.
  • the finished stone form is not moved in the form, but is located on the due to the path control desired position.
  • the improvement in the uniformity of the compression is also to be seen in connection with the fact that the pre-compression has been carried out from below and the upper region of the pre-compressed molding composition is even looser than the lower regions before pressing. Due to the continuous path control, the required height of the stone form can be maintained in an improved manner. As a rule, mandrels protrude from the bottom upwards into the mold.
  • pre-compression it is possible to carry out the pre-compression depending on the pressure. It is particularly expedient and advantageous if the pre-compression is provided by moving the lower die through a pre-compression path and the movement of the lower die via the pre-compression path is controlled away by means of the continuous path measurement. This improves the use of the measuring device provided for distance measurement. In the case of path-dependent control of the lower punch for pre-compression, the computer is informed of the position of the lower punch at the beginning of the pressing path.
  • the control according to the invention can possibly. also provide if the mold is not assigned any mandrels to create cavities in the stone molding. However, it is particularly expedient and advantageous if the lower stamp is penetrated by thorns projecting into the shape. Due to the control according to the invention, the upper punch works until the lower punch stops, i.e. over a long period of time towards the free ends of the mandrels.
  • the present control of the stone molding press is primarily used for the production of sand-lime bricks, but is suitable for other types of stones. Primarily stone moldings with cavities and possibly stone moldings for solid stones are produced.
  • the press is a double-sided compacting press.
  • the piston-cylinder devices work hydraulically and are connected to a pump drive that tries to keep the hydraulic pressure constant.
  • the computer determines the assigned speeds which are required in each case in order to cover the different pressing paths in the same time span; on the basis of the path measurements and the assigned speeds, it issues the necessary control commands which actuate a pressure valve in the pressure fluid supply to the respective piston-cylinder devices.
  • the computer controls these two press valves, ie their opening time and opening width.
  • the correct amount of molding compound to be entered into the mold for each stone molding can be set by pressure measurements during pressing.
  • a pump drive is assigned to the piston-cylinder devices, which is connected to the two piston-cylinder devices via a pressure valve, and if the computer determines the two pressure valves in accordance with the respective displacement measurements and the associated ones Speeds opens or closes. This is an easy to implement embodiment of the control according to the invention.
  • the lower punch is controlled for a short distance after the pressing path has been completed before the finished stone molding is pushed out.
  • the stone form wants namely expand slightly after pressing and this expansion is created by the short backward movement of the lower punch downward space, so that the expansion does not take place during the pushing out, which can lead to damage to the edges of the stone molding.
  • an upper punch 1 and a lower punch 2 can be moved up and down in a press frame (not shown), between which a shape (not shown) is arranged, into which mandrels (not shown below) project which penetrate the lower punch.
  • the upper punch 1 is driven by a piston-cylinder device 3, which has a double-acting piston 4 in a cylinder, one side of which is supplied with pressurized liquid for pressing via a supply line 5 and the other side for pressurized supply via a supply line 6.
  • the lower punch 2 is driven by a piston-cylinder device 7, which has two single-acting pistons 8 in each cylinder and a double-acting piston 9 in a cylinder.
  • the two single-acting pistons 8 are pressurized with hydraulic fluid via a feed line 10.
  • the two single-acting pistons 8 and one side of the double-acting piston 9 are acted upon via a feed line 11.
  • the other side of the double-acting piston 9 is supplied with pressure fluid 12 via a feed line for withdrawal.
  • the upper stamp 1 and the lower stamp 2 each drive over Linkage 13 is a spindle 14 which actuates an actuator 15 which works on a computer unit 16.
  • the computer unit 16 controls a servomotor 17 which operates a pressure valve 18 to which the supply line 5 is connected.
  • the press valve 18 is fed by a slide 19, on which a pump 20 works and which is optionally switched to supplying the feed line 6 for withdrawal.
  • a valve 21 is also installed in the feed line 11, in front of which the feed line 10 branches off to the two single-acting pistons 8. For the withdrawal, the slide 19 are brought into a first position.
  • the slide 19 of the lower punch 2 is first brought into a second position and the valve 21 is kept closed, so that only the two single-acting pistons 8 are acted on via the pressure valve 18.
  • the slide 19 of the upper punch 1 is also brought into the second position and the valve 21 is opened.
  • One press valve 18 is open to the double-acting piston 4 of the upper punch 1 and the other press valve 18 is open to the double-acting piston 9 and the two single-acting pistons 8 of the lower punch 2.
  • the size and duration of the opening widths of the pressure valves 18 are changed in order to move the upper punch and the lower punch for pressing during the same period of time at different speeds over different distances.
  • the size and duration of the respective opening width is determined by the associated computer unit 16, which is fed with information by the position measuring device 13, 14, 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Control Of Presses (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Claims (5)

  1. Commande d'une presse à briques crues,
       dans laquelle un poinçon supérieur (1) et un poinçon inférieur (2) sont attaqués chacun par un dispositif hydraulique à piston-cylindre et le poinçon supérieur agit par le haut et le poinçon inférieur par le bas sur un moule rempli de pâte à mouler, et
       dans laquelle il est prévu une précompression de la pâte à mouler par le bas et où il est prévu, pour le pressage de la pâte à mouler, un mouvement du poinçon supérieur et un mouvement du poinçon inférieur, chacun sur une course de pressage,
       la course de pressage du poinçon supérieure étant plus petite que la course de pressage du poinçon inférieur, les mouvements de course de pressage du poinçon supérieur et du poinçon inférieur se faisant en sens inverse l'un de l'autre, cependant qu'il est prévu une simultanéité des mouvements de course de pressage du poinçon supérieur et du poinçon inférieur,
       caractérisée en ce qu'il est prévu une mesure de déplacement continue (13, 14, 15) sur le poinçon supérieur (1) et sur le poinçon inférieur (2) et les mouvements de pressage du poinçon supérieur (1) et du poinçon inférieur (2) sont commandés en longueur de déplacement (17, 18) de façon continue avec utilisation d'un ordinateur (16) de telle manière que les différentes courses de pressage soient parcourues dans le même temps avec des vitesses différentes.
  2. Commande selon la revendication 1, dans laquelle la précompression est assurée par un mouvement du poinçon inférieur sur une course de précompression, caractérisée en ce que le mouvement du poinçon inférieur (2) est commandé en longueur de déplacement sur la course de précompression au moyen de la mesure de déplacement continue (13, 14, 15).
  3. Commande selon la revendication 1 ou 2, caractérisée en ce que le poinçon inférieur (2) est traversé par des broches qui pénètrent dans le moule.
  4. Commande selon la revendication 1, 2 ou 3, dans laquelle il est prévu un entraînement de pompe associé aux dispositifs à piston-cylindre et qui est relié à chacun des deux dispositifs à piston-cylindre par l'intermédiaire d'une soupape de pressage respective, caractérisée en ce que l'ordinateur (16) ouvre ou ferme les deux soupapes de pressage (18) en réponse aux mesures de déplacement respectives et aux vitesses correspondantes.
  5. Commande selon une des revendications précédentes, caractérisée en ce que le poinçon inférieur (2) est commandé pour décrire un mouvement de retrait de faible longueur après la fin de la course de pressage, avant l'éjection de la brique crue finie.
EP94111269A 1993-09-13 1994-07-20 Dispositif de commande pour une presse à fabriquer des briques crues Expired - Lifetime EP0642918B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4331017A DE4331017C2 (de) 1993-09-13 1993-09-13 Verfahren zum Steuern einer Presse für Steinformlinge
DE4331017 1993-09-13

Publications (2)

Publication Number Publication Date
EP0642918A1 EP0642918A1 (fr) 1995-03-15
EP0642918B1 true EP0642918B1 (fr) 1997-10-15

Family

ID=6497578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94111269A Expired - Lifetime EP0642918B1 (fr) 1993-09-13 1994-07-20 Dispositif de commande pour une presse à fabriquer des briques crues

Country Status (2)

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EP (1) EP0642918B1 (fr)
DE (2) DE4331017C2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016105926A1 (de) 2016-03-31 2017-10-05 Langenstein & Schemann Gmbh Vorrichtung und Verfahren zur Herstellung eines Presslings für Mauersteine
CN115366227B (zh) * 2022-08-08 2024-04-09 四会市大美地新材料有限公司 一种砖坯成型工艺

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE338241B (fr) * 1967-03-22 1971-08-30 Asea Ab
DE2035844A1 (en) * 1970-07-18 1972-01-20 Maschinenfabrik Lauffer & Butscher, 7241 Mühlen Hydraulic press - for powdered materials
US3848525A (en) * 1973-08-30 1974-11-19 Wean United Inc Control means for opposed rams of a press
DE2612167A1 (de) * 1976-03-23 1977-09-29 Dorstener Eisengiesserei U Mas Steinpresse zum herstellen von bausteinen, insbesondere feuerfest- und kalksandsteinen
DE2831166A1 (de) * 1978-07-15 1980-01-24 Dorstener Maschf Ag Einrichtung zum steuern und regeln an einer kunststeinpresse
JPS58119500A (ja) * 1982-01-08 1983-07-15 Nuclear Fuel Co Ltd 粉末成形機の制御方法
FR2570020B1 (fr) * 1984-09-11 1988-07-22 Commissariat Energie Atomique Presse automatique
DE3706193A1 (de) * 1987-02-26 1988-09-08 Langenstein & Schemann Gmbh Hydraulische kaltfliesspresse
DE3716220A1 (de) * 1987-04-01 1988-10-20 Schmidt Feinmech Kolbenpresse
DE3723352A1 (de) * 1987-07-15 1989-02-02 Dorstener Maschf Ag Verfahren zum herstellen von bausteinen
DE3940192A1 (de) * 1989-02-02 1990-08-09 Gottfried Weber Hydraulische presse
GB9022027D0 (en) * 1990-10-10 1990-11-21 Unilever Plc Bar stamping
JPH07112638B2 (ja) * 1991-05-02 1995-12-06 株式会社ヨシツカ精機 粉末成形プレスの加圧制御方法

Also Published As

Publication number Publication date
EP0642918A1 (fr) 1995-03-15
DE4331017C1 (de) 1994-12-22
DE59404330D1 (de) 1997-11-20
DE4331017C2 (de) 1999-09-23

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