DE3821891A1 - CNC hydraulic positioning drive - Google Patents
CNC hydraulic positioning driveInfo
- Publication number
- DE3821891A1 DE3821891A1 DE3821891A DE3821891A DE3821891A1 DE 3821891 A1 DE3821891 A1 DE 3821891A1 DE 3821891 A DE3821891 A DE 3821891A DE 3821891 A DE3821891 A DE 3821891A DE 3821891 A1 DE3821891 A1 DE 3821891A1
- Authority
- DE
- Germany
- Prior art keywords
- control
- cnc
- hydraulic drive
- signal
- pressure
- 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
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
- G05B19/39—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path using a combination of the means covered by at least two of the preceding groups G05B19/21, G05B19/27 and G05B19/33
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/37—Measurements
- G05B2219/37357—Force, pressure, weight or deflection
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/41—Servomotor, servo controller till figures
- G05B2219/41301—Pilot valve, linear fluid control valve and power cylinder
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/42—Servomotor, servo controller kind till VSS
- G05B2219/42123—Position loop then force, current loop
Landscapes
- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Control Of Position Or Direction (AREA)
- Fluid-Pressure Circuits (AREA)
- Servomotors (AREA)
Abstract
Description
Die Erfindung betrifft einen CNC-geregelten hydraulischen Positionierantrieb nach dem Oberbegriff des Anspruches 1.The invention relates to a CNC-controlled hydraulic Positioning drive according to the preamble of claim 1.
Diese Positionierantriebe bestehen in bekannter Weise aus einem Zylinder oder Drehmotor, einem Regelventil, einer Re geleinrichtung, der CNC bzw. dem Wegmeßsystem. Für eine Kraft- oder Druckregelung sind diese bekannten Positionier antriebe nicht geeignet, da während einer Kraft- bzw. Druck-Regelphase der Positionsregelvorgang außer Kraft ge setzt werden muß. Dadurch kommt es in der CNC-Steuerung zu einer Fehlermeldung, die letztendlich den Antrieb stillsetzt.These positioning drives consist of in a known manner a cylinder or rotary motor, a control valve, a re gel device, the CNC or the measuring system. For one Force or pressure control are these known positioning drives are not suitable because during a power or Pressure control phase of the position control process overridden must be set. This is what happens in the CNC control an error message that ultimately stops the drive.
Die Aufgabe der Erfindung besteht darin, ein Umschalten des Positionsregelkreises in einen Kraft- bzw. Druckregelkreis und zurück zu ermöglichen, ohne eine automatische Abschal tung des Antriebes befürchten zu müssen. Nach der Erfindung wird dies mit den Merkmalen des Anspruches 1 oder 2 erzielt.The object of the invention is to switch the Position control loop in a force or pressure control loop and back without an automatic shutdown need to fear the drive. According to the invention this is achieved with the features of claim 1 or 2.
Die Erfindung wird anhand der Zeichnung näher erläutert.The invention is explained in more detail with reference to the drawing.
Der hydraulische Zylinder 1 wird über das Regelventil 2 mit Servoverstärker 3 angesteuert. Das elektrische Positions signal Si wird vom mit der Kolbenstange 4 des hydraulischen Zylinders 1 der CNC-Steuerung 6 als Istwertsignal zuge führt und dort mit dem Sollwertsignal ver glichen. Das Ausgangssignal Sa der CNC-Steuerung wird einem Positionsregler 7 zugeführt und von dort weiter über einen Umschalter 8 dem Servoverstärker 3. Die Zylinderräume 9 und 10 des hydraulischen Zylinders 1 stehen mit elektrischen Druckaufnehmern 11 in Verbindung, deren Ausgangssignal ei nem Druckregler 12 zugeführt wird. Das Ausgangssignal Pa des Druckreglers wird über den Umschalter 8 dem Servover stärker 3 und damit dem Regelventil 2 zugeführt, sobald der Umschalter 8 die Verbindung zwischen Positionsregler 7 und Servoverstärker 3 unterbricht und die Verbindung zwischen Druckregler und Servoverstärker 3 herstellt. Das vom Weg geber austretende Istwertsignal Sia der Position der Kol benstange 4 des Arbeitszylinders wird neben der CNC-Steue rung 6 auch dem Steuerwerk 14 zugeführt. Ebenso wird dem Steuerwerk 14 das dem Druckregler 12 zugeführte Ausgangssig nal P des Druckaufnehmers 11 zugeführt. Ferner wird dem Steuerwerk das Ausgangssignal Sa der CNC-Steuerung 6 zuge führt. Sobald das Signal Sa ein bestimmtes Vorzeichen hat, das Positions-Istwertsignal einen vorgebbaren Wert überschreitet und ein vorgegebener Druckanstieg über dem Druck aufnehmer 11 dem Steuerwerk gemeldet wird, gibt das Steuer werk dem Umschalter 8 das Schaltsignal zum Umschalten von Positionsregelung auf Druckregelung. Die CNC-Steuerung bleibt während dieses Umschaltens voll wirksam. Sobald das von der CNC-Steuerung dem Steuerwerk zugeführte Signal Sa sein Vor zeichen ändert, wird vom Steuerwerk der Umschalter erneut betätigt und in die gezeigte Schaltstellung für die Posi tionsregelung zurückgeschaltet. Sobald die Umschaltung von Positions- auf Druckregelung mittels des Umschalters 8 erfolgt ist, erhält gleichzeitig die CNC-Steuerung 6 vom Steuerwerk ein Signal zugeführt, wodurch der momentane Po sitions-Sollwert in der CNC-Steuerung festgehalten oder auf dem Positions-Istwert überführt wird, um ein Abschalten der CNC-Steuerung zu unterbinden. Vom Steuerwerk 14 erhält außerdem der Positionsregler 7 sowie der Druckregler 12 Steuersignale, die je nach Regelbetrieb den einen oder an deren Regler aktivieren.The hydraulic cylinder 1 is controlled via the control valve 2 with the servo amplifier 3 . The electrical position signal Si is supplied with the piston rod 4 of the hydraulic cylinder 1 of the CNC control 6 as an actual value signal and compared there with the setpoint signal. The output signal Sa of the CNC control is fed to a position controller 7 and from there to the servo amplifier 3 via a changeover switch 8 . The cylinder spaces 9 and 10 of the hydraulic cylinder 1 are connected to electrical pressure transducers 11 , the output signal of which is supplied to a pressure regulator 12 . The output signal Pa of the pressure regulator is fed via the changeover switch 8 to the servo amplifier 3 and thus to the control valve 2 as soon as the changeover switch 8 interrupts the connection between the position regulator 7 and the servo amplifier 3 and establishes the connection between the pressure regulator and the servo amplifier 3 . The actual value signal Sia emerging from the path of the position of the piston rod 4 of the working cylinder is fed to the control unit 14 in addition to the CNC control 6 . Likewise, the control unit 14 is supplied to the pressure regulator 12, output signal P of the pressure sensor 11 . Furthermore, the control unit, the output signal Sa of the CNC controller 6 is supplied. As soon as the signal Sa has a certain sign, the actual position value signal exceeds a predeterminable value and a predetermined pressure increase is reported to the control unit via the pressure transducer 11, the control unit gives the switch 8 the switching signal for switching from position control to pressure control. The CNC control remains fully effective during this switchover. As soon as the signal Sa supplied by the CNC control to the control unit changes its sign, the control unit actuates the changeover switch again and switches back to the switch position shown for position control. As soon as the changeover from position to pressure control has been carried out by means of the changeover switch 8 , the CNC control 6 receives a signal from the control unit at the same time, as a result of which the current position setpoint is recorded in the CNC control or transferred to the actual position value, to prevent the CNC control from being switched off. The position controller 7 and the pressure controller 12 also receive control signals from the control unit 14 which, depending on the control mode, activate one or its controller.
Claims (6)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3821891A DE3821891C2 (en) | 1988-06-29 | 1988-06-29 | CNC controlled hydraulic positioning drive |
CH1233/89A CH681104A5 (en) | 1988-06-29 | 1989-04-04 | |
IT8920310A IT1229299B (en) | 1988-06-29 | 1989-04-28 | HYDRAULIC POSITIONING DEVICE REGULATED WITH CNC. |
US07/657,240 US5230272A (en) | 1988-06-29 | 1991-02-28 | Hydraulic positioning drive with pressure and position feedback control |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3821891A DE3821891C2 (en) | 1988-06-29 | 1988-06-29 | CNC controlled hydraulic positioning drive |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3821891A1 true DE3821891A1 (en) | 1990-01-04 |
DE3821891C2 DE3821891C2 (en) | 1994-05-19 |
Family
ID=6357497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE3821891A Expired - Fee Related DE3821891C2 (en) | 1988-06-29 | 1988-06-29 | CNC controlled hydraulic positioning drive |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH681104A5 (en) |
DE (1) | DE3821891C2 (en) |
IT (1) | IT1229299B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4227563A1 (en) * | 1992-08-20 | 1994-02-24 | Rexroth Mannesmann Gmbh | Electrohydraulic position regulator with two-stage proportional valve - has pilot electrohydraulic stage used to drive main fluid power stage with both having displacement sensors |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3347000A1 (en) * | 1983-12-24 | 1985-07-04 | Robert Bosch Gmbh, 7000 Stuttgart | Electrohydraulic arrangement for controlling a double-acting hydraulic motor |
-
1988
- 1988-06-29 DE DE3821891A patent/DE3821891C2/en not_active Expired - Fee Related
-
1989
- 1989-04-04 CH CH1233/89A patent/CH681104A5/de not_active IP Right Cessation
- 1989-04-28 IT IT8920310A patent/IT1229299B/en active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3347000A1 (en) * | 1983-12-24 | 1985-07-04 | Robert Bosch Gmbh, 7000 Stuttgart | Electrohydraulic arrangement for controlling a double-acting hydraulic motor |
Non-Patent Citations (2)
Title |
---|
DE-Z: Elektrohydraulik in der Fertigungs- technik. In: fluid, Mai 1984, H. 5, S.21-24 * |
DE-Z: TITTMANN, E.: Steuern und regeln mit Pro- portionalventilen. In: fluid, September 1983, S. 32-35 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4227563A1 (en) * | 1992-08-20 | 1994-02-24 | Rexroth Mannesmann Gmbh | Electrohydraulic position regulator with two-stage proportional valve - has pilot electrohydraulic stage used to drive main fluid power stage with both having displacement sensors |
DE4227563C2 (en) * | 1992-08-20 | 2000-04-13 | Mannesmann Rexroth Ag | Controlled hydraulic feed drive |
Also Published As
Publication number | Publication date |
---|---|
DE3821891C2 (en) | 1994-05-19 |
IT8920310A0 (en) | 1989-04-28 |
CH681104A5 (en) | 1993-01-15 |
IT1229299B (en) | 1991-08-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8110 | Request for examination paragraph 44 | ||
D2 | Grant after examination | ||
8363 | Opposition against the patent | ||
8339 | Ceased/non-payment of the annual fee |