EP1346821B1 - Position measurement machine for a powder press - Google Patents
Position measurement machine for a powder press Download PDFInfo
- Publication number
- EP1346821B1 EP1346821B1 EP03005213A EP03005213A EP1346821B1 EP 1346821 B1 EP1346821 B1 EP 1346821B1 EP 03005213 A EP03005213 A EP 03005213A EP 03005213 A EP03005213 A EP 03005213A EP 1346821 B1 EP1346821 B1 EP 1346821B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring
- ruler
- arms
- stamping die
- powder 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
Links
- 238000005259 measurement Methods 0.000 title claims abstract description 12
- 239000000843 powder Substances 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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
Definitions
- the invention relates to a method for measuring the distance of at least one upper and lower punch of a powder press according to the preamble of patent claim 1.
- a path measurement can be achieved by detecting the travel of the piston of a hydraulic cylinder which actuates the ram. Due to the forces occurring during pressing, there is a springing of the machine frame and possibly also to a compression of the punch and the piston rod. The measured values are then no longer the actual ones. If the die has a conical shape, the die table also deflects. Therefore, a distance measurement on the hydraulic cylinders can also serve only for coarse measurement.
- the measuring arm is to be attached to the press punches laterally angeord with the eccentric Neten vertical measuring ruler, which is designed for example as an incremental transducer, cooperates.
- the eccentric Neten vertical measuring ruler which is designed for example as an incremental transducer, cooperates.
- measuring errors can occur.
- a tilting of the arm can take place or a deflection.
- a further falsification of the measurement result can result from the fact that the ram undergoes a tilt by tilting, which is communicated to the cantilevered measuring arm.
- the error described becomes particularly serious when, for example, in a ram a so-called center pin is guided, which is also actuated by a hydraulic cylinder and whose path is also to be measured accurately. Due to constructive circumstances, the position measuring system is to be arranged relatively far outside the center axis of the center pin. Deviations of the center pin from its central position or deformations or pivoting of the measuring arm therefore lead to particularly serious measurement errors.
- the invention has for its object to provide a method for measuring distance for a powder press, can be compensated in the measurement error in an eccentrically arranged position measuring system.
- At least two measuring arms are mounted on opposite sides of at least the upper or lower punch and each measuring arm cooperates with a measuring ruler.
- the Measured variables are given to the computer, wherein a faulty measured variable is compensated by the second.
- the invention assumes that e.g. Upon a change in the bearing of the measuring arm due to a friction on the measuring ruler of the other measuring arm accordingly undergoes a shift in the opposite direction. This is particularly the case when the two measuring arms are formed by a common lever, the measuring rulers are arranged on diametrically opposite sides of the ram.
- a displacement of a measuring arm can also be done by the measuring arms are guided by a linear vertical guide. While the guides are intended to help prevent displacement of the measuring arms, they can not always do so. Again, the displacement of the measuring arm on one side of the ram would lead to an opposite displacement of the measuring arm on the opposite side.
- a powder press 10 can be seen, which has a frame 12.
- An upper plate 14 of the frame supports a hydraulic cylinder 16, the piston 18 actuates an upper punch 20.
- a lower plate 22 of the frame 12 supports a lower hydraulic cylinder 24, which operates a lower punch 26, with the interposition of a box-shaped member 28, which will be discussed below.
- a die plate 30 is fixedly mounted in the frame 12 and receives in a bore a die 32, with which upper and lower punches 20, 26 cooperate, as shown, for the production of a compact 34th
- a center pin 36 which is actuated by a hydraulic cylinder 38 extends.
- the hydraulic cylinder 38 is supported on the bottom of the box-shaped component 28. It serves to produce a central hole in the compact 34.
- an arm 40 or 42 is connected on diametrically opposite sides, which interact with a vertical measuring ruler 44 and 46, respectively, as known per se. It is e.g. around known per se incremental transducer.
- the measuring rulers 44, 46 are firmly connected to the die plate 30. With the help of the measuring rulers, it is possible to determine the exact path of the upper punch 20 relative to the die plate 30.
- a cross bar 56 is connected within the box-shaped member 28, which forms a measuring arm on opposite sides of the center pin 36, comparable to the measuring arms 40, 42 and 48,50. she cooperate with measuring rulers 58 and 60 within the component 28.
- linear vertical guides 62 and 64 are arranged on opposite sides on both sides of the center pin 36 and the hydraulic cylinder 38. They serve to stir the movement of the measuring arms of the rod 56 so that it moves in an exact horizontal plane with the center pin 36, so that the measuring rulers 58, 60 determine the exact way.
- a displacement of the measuring arms can occur, as in Fig. 2 is shown.
- a measuring system for example, the right in Fig.
- a displacement of the right measuring arm results in a difference between the distance traveled 70 and the measured distance 72.
- the difference is attributed to the tilting (exaggerated) of the center pin 36.
- the measured path 74 is greater than the actually traveled path 76.
- this compensation principle also for the measuring systems for the upper punch 20 and the lower punch 26, as they are in Fig. 1 are shown, can be applied.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Presses And Accessory Devices Thereof (AREA)
- Control Of Presses (AREA)
- Sampling And Sample Adjustment (AREA)
- Press Drives And Press Lines (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Wegmessung mindestens eines Ober- und Unterstempels einer Pulverpresse nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for measuring the distance of at least one upper and lower punch of a powder press according to the preamble of patent claim 1.
Für die Herstellung maßgenauer Preßlinge ist die Positioniergenauigkeit von Ober- und Unterstempel einer Pulverpresse, beispielsweise einer Metallpulverpresse, von großer Bedeutung. Eine Genauigkeit von < 0,01 mm muß eingehalten werden.For the production of dimensionally accurate compacts, the positioning accuracy of the upper and lower punches of a powder press, for example a metal powder press, is of great importance. An accuracy of <0.01 mm must be maintained.
Eine Wegmessung kann dadurch erzielt werden, daß der Weg des Kolbens eines Hydraulikzylinders erfaßt wird, der den Preßstempel betätigt. Aufgrund der beim Pressen auftretenden Kräfte kommt es zu einer Auffederung des Maschinengestells und gegebenenfalls auch zu einem Stauchen des Stempels und der Kolbenstange. Die gemessenen Werte entsprechen dann nicht mehr den tatsächlichen. Hat die Matrize eine kegelige Form, kommt es ferner zu einer Durchbiegung des Matrizentisches. Daher kann eine Wegmessung an den Hydraulikzylindern auch nur zur Grobmessung dienen.A path measurement can be achieved by detecting the travel of the piston of a hydraulic cylinder which actuates the ram. Due to the forces occurring during pressing, there is a springing of the machine frame and possibly also to a compression of the punch and the piston rod. The measured values are then no longer the actual ones. If the die has a conical shape, the die table also deflects. Therefore, a distance measurement on the hydraulic cylinders can also serve only for coarse measurement.
Aus
Aus
Aus konstruktiven Gründen ist es nicht möglich, das inkrementale Meßsystem in die Achse der Preßstempel zu legen. Vielmehr ist an den Preßstempeln seitlich der Meßarm anzubringen, der mit dem exzentrisch angeord neten vertikalen Meßlineal, das z.B. als inkrementaler Wegaufnehmer ausgebildet ist, zusammenwirkt. Bei einem derartigen Meßsystem können jedoch ebenfalls Meßfehler auftreten. So kann z.B. durch Reibung des Meßarms an dem Meßlineal ein Kippen des Armes erfolgen bzw. eine Durchbiegung. Eine weitere Verfälschung des Meßergebnisses kann dadurch entstehen, daß der Preßstempel durch Kippen eine Neigung erfährt, die dem auskragenden Meßarm mitgeteilt wird. Der beschriebene Fehler wird insbesondere dann gravierend, wenn z.B. in einem Preßstempel ein sogenannter Mittelstift geführt ist, der gleichfalls durch einen Hydraulikzylinder betätigt wird und dessen Weg ebenfalls genau gemessen werden soll. Aufgrund konstruktiver Umstände ist das Wegmeßsystem relativ weit außerhalb der Mittenachse des Mittelstiftes anzuordnen. Abweichungen des Mittelstiftes von seiner zentralen Lage bzw. Verformungen oder Verschwenkungen des Meßarms führen daher zu besonders gravierenden Meßfehlern.For structural reasons, it is not possible to place the incremental measuring system in the axis of the ram. Rather, the measuring arm is to be attached to the press punches laterally angeord with the eccentric Neten vertical measuring ruler, which is designed for example as an incremental transducer, cooperates. In such a measuring system, however, also measuring errors can occur. Thus, for example by friction of the measuring arm on the measuring ruler, a tilting of the arm can take place or a deflection. A further falsification of the measurement result can result from the fact that the ram undergoes a tilt by tilting, which is communicated to the cantilevered measuring arm. The error described becomes particularly serious when, for example, in a ram a so-called center pin is guided, which is also actuated by a hydraulic cylinder and whose path is also to be measured accurately. Due to constructive circumstances, the position measuring system is to be arranged relatively far outside the center axis of the center pin. Deviations of the center pin from its central position or deformations or pivoting of the measuring arm therefore lead to particularly serious measurement errors.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Wegmessung für eine Pulverpresse zu schaffen, bei dem Meßfehler bei einem exzentrisch angeordneten Wegmeßsystem kompensiert werden können.The invention has for its object to provide a method for measuring distance for a powder press, can be compensated in the measurement error in an eccentrically arranged position measuring system.
Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is solved by the features of patent claim 1.
Bei dem erfindungsgemäßen Verfahren werden mindestens zwei Meßarme auf gegenüberliegenden Seiten an mindestens dem Ober- oder Unterstempel angebracht und jeder Meßarm wirkt mit einem Meßlineal zusammen. Die Meßgrößen werden in den Rechner gegeben, wobei eine fehlerhafte Meßgröße durch die zweite kompensiert wird.In the method according to the invention at least two measuring arms are mounted on opposite sides of at least the upper or lower punch and each measuring arm cooperates with a measuring ruler. The Measured variables are given to the computer, wherein a faulty measured variable is compensated by the second.
Bei der Erfindung wird davon ausgegangen, daß z.B. bei einer Lagerveränderung des Meßarms aufgrund einer Reibung am Meßlineal der andere Meßarm entsprechend eine Verlagerung in die entgegengesetzte Richtung erfährt. Dies ist insbesondere der Fall, wenn die beiden Meßarme von einem gemeinsamen Hebel gebildet sind, wobei die Meßlineale auf diametral gegenüberliegenden Seiten des Preßstempels angeordnet sind.The invention assumes that e.g. Upon a change in the bearing of the measuring arm due to a friction on the measuring ruler of the other measuring arm accordingly undergoes a shift in the opposite direction. This is particularly the case when the two measuring arms are formed by a common lever, the measuring rulers are arranged on diametrically opposite sides of the ram.
Eine Verlagerung eines Meßarms kann auch dadurch geschehen, daß die Meßarme durch eine lineare vertikale Führung geführt sind. Die Führungen sollen zwar eine Verlagerung der Meßarme vermeiden helfen, können dies jedoch nicht immer. Auch hierbei würde die Verlagerung des Meßarms auf der einen Seite des Preßstempels zu einer entgegengesetzten Verlagerung des Meßarms auf der gegenüberliegenden Seite führen.A displacement of a measuring arm can also be done by the measuring arms are guided by a linear vertical guide. While the guides are intended to help prevent displacement of the measuring arms, they can not always do so. Again, the displacement of the measuring arm on one side of the ram would lead to an opposite displacement of the measuring arm on the opposite side.
Eine weitere Verfälschung des Meßergebnisses wird, wie schon oben erwähnt, dadurch erhalten, daß der Preßstempel gegenüber der exakten vertikalen Achse kippt. Das Kippen des Preßstempels zu allen möglichen Seiten kann jedoch nur dann vollständig erfaßt werden, wenn mindestens drei vorzugsweise gleichmäßig am Umfang angeordnete aus Meßarm und Meßlineal bestehende Meßsysteme vorgesehen werden. Deren Meßergebnisse werden im Rechner verarbeitet, so daß der tatsächlich zurückgelegte Weg des Preßstempels gemessen werden kann.A further falsification of the measurement result, as already mentioned above, obtained by tilting the ram against the exact vertical axis. However, the tilting of the ram to all possible sides can only be fully detected if at least three, preferably evenly arranged on the circumference consisting of measuring arm and measuring ruler measuring systems are provided. Their results are processed in the computer, so that the actually traveled path of the ram can be measured.
Die Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert.
- Fig. 1
- zeigt schematisch die Seitenansicht einer Pulverpresse mit Meßsystemen nach der Erfindung.
- Fig.2
- zeigt eine Einzelheit der Pulverpresse nach
Fig. 1 mit einem Wegmeßsystem nach der Erfindung.
- Fig. 1
- schematically shows the side view of a powder press with measuring systems according to the invention.
- Fig.2
- shows a detail of the powder press after
Fig. 1 with a position measuring system according to the invention.
In
Durch eine zentrische axiale Bohrung des Unterstempels 26 erstreckt sich ein Mittelstift 36, der von einem Hydraulikzylinder 38 betätigt wird. Der Hydraulikzylinder 38 stützt sich am Boden des kastenförmigen Bauteils 28 ab. Er dient zur Herstellung eines mittigen Loches im Preßling 34.Through a central axial bore of the
Mit dem Oberstempel 20 ist auf diametral gegenüberliegenden Seiten ein Arm 40 bzw. 42 verbunden, die mit einem vertikalen Meßlineal 44 bzw. 46 schleifend zusammenwirken, wie an sich bekannt. Es handelt sich z.B. um an sich bekannte inkrementale Wegaufnehmer. Die Meßlineale 44, 46 sind fest mit der Matrizenplatte 30 verbunden. Mit Hilfe der Meßlineale ist es möglich, den exakten Weg des Oberstempels 20 relativ zur Matrizenplatte 30 zu bestimmen.With the
Mit Hilfe von Meßarmen 48, 50 am Unterstempel 26 und Meßlinealen 52, 54, die mit der Unterseite der Matrizenplatte 30 verbunden sind, läßt sich auch der exakte Weg des Unterstempels 26 relativ zur Matrizenplatte bestimmen.By means of measuring
Mit dem Mittelstift 36 ist innerhalb des kastenförmigen Bauteils 28 ein Querstab 56 verbunden, der auf gegenüberliegenden Seiten des Mittelstifts 36 einen Meßarm bildet, vergleichbar der Meßarmen 40, 42 bzw. 48,50. Sie wirken mit Meßlinealen 58 bzw. 60 innerhalb des Bauteils 28 zusammen. Auf gegenüberliegenden Seiten beidseits des Mittelstiftes 36 bzw. des Hydraulikzylinders 38 sind lineare vertikale Führungen 62 bzw. 64 angeordnet. Sie dienen dazu, die Bewegung der Meßarme des Stabes 56 so zu rühren, daß er sich in einer exakten horizontalen Ebene mit dem Mittelstift 36 bewegt, so daß die Meßlineale 58, 60 den exakten Weg ermitteln. Da jedoch trotz der Führungen 62, 64 eine Verlagerung der Meßarme eintreten kann, wie dies in
Claims (3)
- Method for the path-measuring of at least one top and one bottom stamping die (20, 26) of a powder press (10), wherein the top and bottom stamping die (20, 26) are actuated by a hydraulic cylinder and co-operate with a mould of a mould plate, wherein a laterally projecting index arm (40, 42; 48, 50, 56) on the top and the bottom stamping die (20, 26) co-operates with an assigned vertical measuring ruler (44, 46; 52, 54) at a frame (12) for the powder press (10), and the measurement results are transmitted to a machine computer, characterised in that at least two index arms (40, 42; 48, 50, 56) on opposing sides on at least the top and the bottom stamping die (20, 26) co-operate with a measuring ruler (44, 46; 52, 54), and the machine computer compensates an incorrect measurement value on one measuring ruler by the second measurement value on the other measuring ruler.
- Path-measuring system according to claim 1, characterised in that at least three measuring systems comprising index arm and measuring ruler are arranged in equal circumferential distance on the top and the bottom stamping die.
- Path-measuring system according to claim 1 or 2, characterised in that the arms (56) are guided in a vertical linear guiding (62, 64) and that the guidings (62, 64), measuring rulers (58, 60) and the arms of one measuring system comprising index arm and measuring ruler are arranged in one plane.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10212315A DE10212315B4 (en) | 2002-03-20 | 2002-03-20 | Position measuring system for a powder press |
DE10212315 | 2002-03-20 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1346821A2 EP1346821A2 (en) | 2003-09-24 |
EP1346821A3 EP1346821A3 (en) | 2004-05-06 |
EP1346821B1 true EP1346821B1 (en) | 2010-01-13 |
Family
ID=27771442
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03005213A Expired - Lifetime EP1346821B1 (en) | 2002-03-20 | 2003-03-08 | Position measurement machine for a powder press |
Country Status (4)
Country | Link |
---|---|
US (1) | US20030180408A1 (en) |
EP (1) | EP1346821B1 (en) |
AT (1) | ATE454978T1 (en) |
DE (2) | DE10212315B4 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013113665B4 (en) * | 2013-12-06 | 2015-09-03 | Fette Compacting Gmbh | Press |
DE102016120195A1 (en) | 2016-10-24 | 2018-04-26 | Dorst Technologies Gmbh & Co. Kg | press means |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4184827A (en) * | 1975-12-16 | 1980-01-22 | General Electric Company | Apparatus for monitoring and controlling the operation of a dual platen press |
DE2924704A1 (en) * | 1979-06-19 | 1981-01-15 | Dorst Keramikmasch | DEVICE FOR DETERMINING THE HEIGHT OF PRESSED PARTS ON A PRESS, IN PARTICULAR FOR PRESSING PRESSED PARTS FROM POWDER-BASED INITIAL MATERIAL |
DE3919821C2 (en) * | 1989-06-15 | 1994-04-07 | Mannesmann Ag | Method and device for producing dimensionally stable compacts |
DE3930475A1 (en) * | 1989-09-12 | 1991-03-14 | Dorst Masch & Anlagen | PRESS FOR THE PRODUCTION OF TAILORED PRESSINGS FROM POWDER-SHAPED MATERIAL |
JPH03178412A (en) * | 1989-12-07 | 1991-08-02 | Mazda Motor Corp | In-mold coating method |
DE4428842C1 (en) * | 1994-08-02 | 1996-01-18 | Mannesmann Ag | Device for the production of compacts |
JPH11179599A (en) * | 1997-12-15 | 1999-07-06 | Aida Eng Ltd | Slide position controller in servo press |
DE19846210A1 (en) * | 1998-10-07 | 2000-04-13 | Dorst Masch & Anlagen | Press for the production of moldings |
DE19919693C2 (en) * | 1999-04-30 | 2001-08-23 | Fette Wilhelm Gmbh | Method for determining the position of a ram of a powder press |
JP2000343283A (en) * | 1999-05-31 | 2000-12-12 | Yamada Dobby Co Ltd | Device for controlling slide of screw press |
-
2002
- 2002-03-20 DE DE10212315A patent/DE10212315B4/en not_active Expired - Fee Related
-
2003
- 2003-03-08 AT AT03005213T patent/ATE454978T1/en active
- 2003-03-08 EP EP03005213A patent/EP1346821B1/en not_active Expired - Lifetime
- 2003-03-08 DE DE50312335T patent/DE50312335D1/en not_active Expired - Lifetime
- 2003-03-19 US US10/391,969 patent/US20030180408A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
US20030180408A1 (en) | 2003-09-25 |
DE10212315B4 (en) | 2004-04-29 |
ATE454978T1 (en) | 2010-01-15 |
DE10212315A1 (en) | 2003-10-16 |
EP1346821A2 (en) | 2003-09-24 |
EP1346821A3 (en) | 2004-05-06 |
DE50312335D1 (en) | 2010-03-04 |
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