EP0284903A2 - Presse à piston - Google Patents

Presse à piston Download PDF

Info

Publication number: EP0284903A2
Authority: EP; European Patent Office
Prior art keywords: controller; piston; cylinder; plunger; piston press
Prior art date: 1987-04-01
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

EP88104222A

Other languages

German (de)

English (en)

Other versions

EP0284903A3 (en

EP0284903B1 (fr

Inventor

Rolf Schmidt

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.)

Gebrueder Schmidt Fabrik fuer Feinmechanik GmbH and Co KG

Original Assignee

Gebrueder Schmidt Fabrik fuer Feinmechanik GmbH and Co KG

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1987-04-01

Filing date

1988-03-17

Publication date

1988-10-05

1988-03-17 Application filed by Gebrueder Schmidt Fabrik fuer Feinmechanik GmbH and Co KG filed Critical Gebrueder Schmidt Fabrik fuer Feinmechanik GmbH and Co KG

1988-03-17 Priority to AT88104222T priority Critical patent/ATE90024T1/de

1988-10-05 Publication of EP0284903A2 publication Critical patent/EP0284903A2/fr

1989-09-20 Publication of EP0284903A3 publication Critical patent/EP0284903A3/de

1993-06-02 Application granted granted Critical

1993-06-02 Publication of EP0284903B1 publication Critical patent/EP0284903B1/fr

2008-03-17 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

- 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
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/26—Program-control arrangements

Definitions

the invention relates to a piston press with a plunger which is connected to a piston running in a cylinder, the cylinder being pressurized with compressed air via valves.
Piston presses of the type mentioned above are generally known.
the compressed air is supplied to the piston via switching valves, which moves the plunger until it hits the workpiece.
the plunger is either placed on the workpiece with full force, which corresponds to the preset pressure of the compressed air, or else limit switches are provided which, when a predetermined end position of the tappet is reached, close the valves again or bring the tappet back.
the known piston presses with pneumatic drive thus have the disadvantage that sensitive control, in particular a displacement / time control, is not possible because the plunger of known pneumatic piston presses rests on the workpiece with full force and at most decreases in the actuating pressure when a limit switch is reached .
the invention is based on the object of developing a piston press of the type mentioned in such a way that the ram can be deflected precisely in a positionally controlled manner.
the plunger interacts with a displacement measuring system, that an output signal of the displacement measuring system is compared in a controller with predetermined setpoints and that the controller controls electro-pneumatic servo valves for pressurizing the cylinder according to a predetermined displacement / time curve.
the object on which the invention is based is completely achieved in this way because the pressing process can be adapted to a wide variety of pressing tasks by means of the controllable path / time profile.
particularly sensitive pressing tasks can be solved, and the paths to be measured and the speeds at which the paths are measured can be adapted to the respective pressing task.
the path / time curve is divided into discrete areas of different gradients, the plunger being moved from a rest position to a final position at a gradually decreasing speed.
the controller is a state controller with adjustable controller parameters, which forms control signals as a function of the travel signal, a speed signal and an acceleration signal, and the controller parameters can be switched over automatically when changing from a first area to a second area.
This measure has the advantage that the control can be optimally controlled in the different areas of different gradients of the path / time curve, because the parameters of the controller that determine the control process can be adapted to the respective gradients and thus the respective workpiece.
a pressure sensor detects the pressure acting on the cylinder or the pressing force exerted by the ram, compares these values with a predetermined target value range and actuates a display element if the range is not complied with.
servo valves are 3/2-servo valves with pilot valve. This combination of a directional servo valve with a pressure servo valve enables both sensitive pressure control and exact positioning of the press ram.
FIG. 1 10 designates an embodiment of a piston press according to the invention.
a machine table 11 stands on a solid surface.
a workpiece 12 can be seen on the machine table 11, which is to be pressed, for example, with a bolt 13.
a piston 16 runs in the cylinder 15 and is firmly connected to a tappet 17.
the plunger 17 is connected to a position measuring system 18 at a suitable point.
a rod 19 extends from the upper end face of the plunger 17 and carries an inductive element 20.
the element 20 interacts with a coil 21.
any other suitable displacement measuring system for example a capacitive or an optical or some other displacement measuring system, can be used.
an electrical line 30 leads once directly, once via a differentiating stage 31 and again via a double differentiating stage 33 to a control unit 34. If the path signal detected by the measuring system 18 is denoted by s, then the signals s, ⁇ and on the control unit 34.
Setpoints s0, s1, s2, s3 ... of the travel path 17 of the plunger 17 can be specified to the control unit 34 via a first keyboard 35.
Additional setpoints can be entered into the control unit 34 via a second keyboard 36, for example an upper and a lower limit value p0, p u of an operating pressure p of the piston press 10.
the control device 34 comprises a controller 37, which is preferably a state controller of a type known per se.
the controller characteristic can be defined in a manner known per se via controller parameters.
the controller 37 is provided with adjustable controller parameters, as will be explained further below.
control unit 34 comprises, in addition to comparators (not shown) for comparing the actual path s with the target values s0, s1 ... a comparator 38 for comparing pressure values p, as will be explained further below.
an upper space 40 extends in the cylinder 15. This is connected with a pneumatic line 41 to an electropneumatic 3/2-servo valve which is internally provided with a pilot valve, as described in detail for example in DIN ISO 1219 under 7.2 .
a lower space 43 of the cylinder 15 below the piston 16 is connected to a further electropneumatic 3/2 servo valve 45 by a pneumatic line 44.
the servo valves 42, 45 are controlled separately by the controller 37.
a pressure sensor 50 detects, for example, the differential pressure between the spaces 40 and 43 and supplies a corresponding signal p to the comparator 38 in the control unit 34, the further input of which is connected to the limit values p0, p u specified by the second keyboard 36.
a force sensor 70 for example a piezoelectric sensor, can be arranged on the plunger 17 in order to detect the pressing force F which the plunger 17 exerts on the workpiece 12/13. Limit values F0, F u can then be specified in another operating mode by means of the second keyboard 36.
the output of the comparator 38 controls a display element 51.
the operation of the piston press 10 according to FIG. 1 is as follows: Depending on the workpiece 12, 13 to be machined, the user of the piston press 10 first enters 35 paths using the first keyboard, s0 being the rest position of the ram 17 when the piston 16 has reached its upper end position in FIG. 1. Between the value s0 and a further value s1, the plunger 17 measures the empty space until it is placed on the workpiece 12, 13. From the value s1 to a value s2, there is now a working stroke in which the essential pressing work, for example the pressing in of the bolt 13 into the workpiece 12. Finally, there is a small path from the value s2 to a further value s3, in which, for example, the bolt 13 is positioned exactly on the final value. The user also specifies travel speeds for the plunger 17 in the various stroke ranges.
the user also uses the second keyboard 36 to enter a pressure range between a lower value p u and an upper value p0 or a pressing force range F0 - F u , it being checked whether the pressure p or the force required to deflect the plunger 17 is to be checked Press force F lies within this range of values p0 - p u or F0 - F u .
the piston press 10 is now switched on by means of a switch (not shown in FIG. 1).
the first servo valve 42 is switched from the position shown in FIG. 1 so that compressed air flows from a reservoir via the pneumatic line 41 into the upper space 40.
the piston 16 now moves downward, the instantaneous position of the piston 16 or the plunger 17 being detected by means of the displacement measuring system 18 and readjusted if necessary by actuating the valves 42, 45 in accordance with the specified displacement / time dependence.
the Controller 37 is consequently fed a path signal s, a speed signal s and an acceleration signal s, and the controller 37 generates the analog control signal for depending on predetermined controller parameters, which were determined from the predetermined values s0, s1, s2 and s3 and the travel speeds the servo valves 42 and 45.
the associated path / time diagram is plotted in FIG. 2.
the piston press 10 was turned on at time t0 and up to time t1 the idle stroke between the upper starting position s0 and touchdown s1 measured on the bolt 13. As can be seen from the relatively steep course in the interval t0 to t1, this idle stroke happens with a relatively high travel speed.
the measuring system 18 recognizes that the predetermined value s 1 has been reached.
the controller parameters are now switched in the controller 37, as can be seen from the short overshoot in FIG. 2.
the piston 16 with plunger 17 continues its path somewhat more slowly until the working stroke has ended t2 and the bolt 13 is almost in its end position.
a short holding phase then preferably follows until the piston 16 returns to its upper starting position by corresponding actuation of the servo valves 42, 45.
the control unit 34 has compared the pressure applied with the pressure interval p u - p u by means of the comparator 38.
the corresponding characteristic of the comparator 38 is shown in FIG. 3. It can be seen that a quality signal Q is derived which assumes the value 1 in the interval p0 - p u and the value 0 outside this interval.
a display element 51 is therefore only (or with appropriate logic only then not) controlled if a pressure had to be used to measure the path up to the value s3, which was in the interval p0 - p u .
the same applies in the case of the monitoring of the pressing force if it is determined whether the pressing force F is in the interval F u - F0.

Landscapes

Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
Control Of Presses (AREA)

EP88104222A 1987-04-01 1988-03-17 Presse à piston Expired - Lifetime EP0284903B1 (fr)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
AT88104222T ATE90024T1 (de)	1987-04-01	1988-03-17	Kolbenpresse.

Applications Claiming Priority (4)

Application Number	Priority Date	Filing Date	Title
DE3710289		1987-04-01
DE3710289		1987-04-01
DE3716220		1987-05-14
DE19873716220 DE3716220A1 (de)	1987-04-01	1987-05-14	Kolbenpresse

Publications (3)

Publication Number	Publication Date
EP0284903A2 true EP0284903A2 (fr)	1988-10-05
EP0284903A3 EP0284903A3 (en)	1989-09-20
EP0284903B1 EP0284903B1 (fr)	1993-06-02

Family

ID=25854026

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP88104222A Expired - Lifetime EP0284903B1 (fr)	1987-04-01	1988-03-17	Presse à piston

Country Status (2)

Country	Link
EP (1)	EP0284903B1 (fr)
DE (2)	DE3716220A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0365317A1 (fr) *	1988-10-18	1990-04-25	Aida Engineering Ltd.	Dispositif de matrice à coussin élastique pneumatique
EP0461184A4 (en) *	1989-03-03	1992-03-25	David F. Capps	Control apparatus and method for progressive fracture of workpieces
EP0485843A1 (fr) *	1990-11-06	1992-05-20	Sumitomo Heavy Industries, Ltd.	Appareil pour le contrôle d'ouverture/fermeture d'un moule
EP0642918A1 (fr) *	1993-09-13	1995-03-15	LANGENSTEIN & SCHEMANN GMBH	Dispositif de commande pour une presse à fabriquer des briques crues

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE10023164B4 (de) *	1999-05-12	2006-11-30	Hornung Gmbh Indupress & Co. Kg	Bügelmaschine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB1518720A (en) *	1975-11-21	1978-07-26	Ishikawajima Harima Heavy Ind	Hydraulic servomechanism
DE2937998A1 (de) *	1979-09-20	1981-04-02	Beche & Grohs GmbH, 5609 Hückeswagen	Verfahren zur steuerung des arbeitsablaufes einer druckmittelbeaufschlagten arbeitsmaschine sowie druckmittelbeauschlagte arbeitsmaschine mit druckmittelsteuerung
DE3230930A1 (de) *	1982-08-20	1984-02-23	Schirmer, Plate und Siempelkamp Hydraulische Pressen GmbH, 4150 Krefeld	Regeltechnische schaltungsanordnung bei einer umformpresse
DE3401203C1 (de) *	1984-01-14	1985-05-30	Hoesch Ag, 4600 Dortmund	Hydraulische Presse zum Verpressen von Kunststoff-Halbzeug
FR2600120B1 (fr) *	1986-06-12	1990-06-29	Bertin & Cie	Procede et dispositif d'asservissement en position d'un verin pneumatique

1987
- 1987-05-14 DE DE19873716220 patent/DE3716220A1/de not_active Withdrawn
1988
- 1988-03-17 EP EP88104222A patent/EP0284903B1/fr not_active Expired - Lifetime
- 1988-03-17 DE DE8888104222T patent/DE3881424D1/de not_active Expired - Lifetime

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0365317A1 (fr) *	1988-10-18	1990-04-25	Aida Engineering Ltd.	Dispositif de matrice à coussin élastique pneumatique
US5100113A (en) *	1988-10-18	1992-03-31	Aida Engineering Co., Ltd.	Pneumatic die cushion equipment
EP0461184A4 (en) *	1989-03-03	1992-03-25	David F. Capps	Control apparatus and method for progressive fracture of workpieces
EP0485843A1 (fr) *	1990-11-06	1992-05-20	Sumitomo Heavy Industries, Ltd.	Appareil pour le contrôle d'ouverture/fermeture d'un moule
EP0642918A1 (fr) *	1993-09-13	1995-03-15	LANGENSTEIN & SCHEMANN GMBH	Dispositif de commande pour une presse à fabriquer des briques crues

Also Published As

Publication number	Publication date
EP0284903A3 (en)	1989-09-20
EP0284903B1 (fr)	1993-06-02
DE3716220A1 (de)	1988-10-20
DE3881424D1 (de)	1993-07-08

Legal Events

Date	Code	Title	Description
1988-08-20	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
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1990-05-16	17P	Request for examination filed	Effective date: 19900315
1992-04-01	17Q	First examination report despatched	Effective date: 19911011
1993-04-15	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1993-06-02	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): AT BE CH DE FR GB IT LI LU NL
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1993-06-16	ITF	It: translation for a ep patent filed
1993-07-07	GBT	Gb: translation of ep patent filed (gb section 77(6)(a)/1977)	Effective date: 19930607
1993-07-08	REF	Corresponds to:	Ref document number: 3881424 Country of ref document: DE Date of ref document: 19930708
1993-07-16	ET	Fr: translation filed
1993-11-16	NLV1	Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
1994-03-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19940331
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1994-04-01	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
1994-05-25	26N	No opposition filed
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