EP2846994A1 - Method for operating a hydraulic press, and hydraulic press - Google Patents
Method for operating a hydraulic press, and hydraulic pressInfo
- Publication number
- EP2846994A1 EP2846994A1 EP13722386.3A EP13722386A EP2846994A1 EP 2846994 A1 EP2846994 A1 EP 2846994A1 EP 13722386 A EP13722386 A EP 13722386A EP 2846994 A1 EP2846994 A1 EP 2846994A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- pressure
- tank
- speed
- chamber
- 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
- 238000000034 method Methods 0.000 title claims abstract description 46
- 239000012530 fluid Substances 0.000 claims abstract description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 230000003044 adaptive effect Effects 0.000 claims description 8
- 230000006870 function Effects 0.000 claims description 8
- 230000033228 biological regulation Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000007493 shaping process Methods 0.000 abstract 3
- 239000003921 oil Substances 0.000 description 13
- 230000033001 locomotion Effects 0.000 description 10
- 239000010720 hydraulic oil Substances 0.000 description 8
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 230000003213 activating effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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
- B30B15/163—Control arrangements for fluid-driven presses for accumulator-driven presses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
- F15B1/033—Installations or systems with accumulators having accumulator charging devices with electrical control means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/50—Monitoring, detection and testing means for accumulators
- F15B2201/51—Pressure detection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20507—Type of prime mover
- F15B2211/20515—Electric motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20538—Type of pump constant capacity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/25—Pressure control functions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6651—Control of the prime mover, e.g. control of the output torque or rotational speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6653—Pressure control
Definitions
- the invention relates to a method for operating a hydraulic press according to the preamble of claim 1 and a hydraulic press according to the preamble of claim 22.
- DE 25 44 794 A1 describes a hydraulic press consisting of a
- the hydraulic drive consists of a working cylinder with a working piston of larger diameter and a moving cylinder with a moving piston of smaller diameter.
- the pistons are firmly connected with each other at a distance.
- the working cylinder is from the first memory via a directional control valve and the
- Movement cylinder fed from the second memory via a servo valve within a closed loop.
- the control loop consists of one
- the Setpoint generator a control amplifier, the servo valve, a position transducer and a measuring amplifier.
- the directional control valve is designed as a valve with fixed switching positions.
- a pressure limiting valve is arranged in the pressure line of the pump leading to the reservoirs.
- the amount of oil needed to drive the press is supplied by the pump from a tank via the reservoirs.
- the reservoirs are supplied with a compressible medium from a gas bottle. This document also describes the operation and operation of this press, in which the uppermost position of the hydraulic piston is the starting point.
- the pressing stroke which is initiated by switching the directional control valve, the working piston is acted upon via the directional control valve from the first reservoir, which was previously filled with an amount of oil metered in accordance with the pressing stroke. This amount of oil causes a predetermined
- the pump fills the first memory again with the predetermined amount of pressure oil that can be specified by a limit switch on the first memory, which switches an oil valve in the leading to the first memory pressure line of the pump.
- this filling control corresponds to a regulation of the pressure prevailing in the first memory pressure to a pressure command variable, which depends on the limit switch and the compressible medium from the gas bottle.
- the charge flow is set to zero by the oil valve is switched to a blocking position in which it separates the first memory from the pressure port of the pump.
- the pump driven by the on-going motor increases the pressure in the pressure line until the pressure relief valve responds and connects the pressure port to the tank, causing the pump to idle at full speed. This leads to unnecessarily high energy consumption.
- the pump must be designed so large that it can promote the predetermined amount of pressure oil in the memory during the break.
- the invention proposes a method for operating a hydraulic press in cycles, in particular for forming workpieces, wherein:
- each cycle has at least one phase in which hydraulic fluid from a hydraulic accumulator (15) into a chamber (1 1 .1, 1 1 .2) of a hydraulic cylinder (1 1) of the accumulator pressure p s prevailing in the accumulator (15) Press (10) is pressed to a to the cylinder (1 1) coupled to the plunger (12) of the press (10), to which a forming tool (21) for forming a workpiece, relative to the cylinder (1 1) move;
- a hydraulic pump (13) driven by a motor (14) delivers hydraulic fluid into the reservoir (15) with a charge flow and the reservoir pressure p s to a reservoir
- Pressure control variable P S OLL is controlled by a speed of the motor (14) to a rated speed n N of the motor (14) and at least one
- n z is set, for which 0 ⁇ n z ⁇ n N holds.
- the energy consumption compared to that from the DE 25 44 794 A1 known methods can be lowered.
- the efficiency of the method can be increased.
- a reduction in the speed leads to a noise reduction.
- Rated speed is understood here to be the maximum speed which the engine can provide permanently without damage or to which the engine is designed as intended.
- the proposed method can be configured as desired in any manner and, for example, have the control of the accumulator pressure p s in at least one additional phase.
- the press may be one of the presses proposed according to the second aspect described below.
- the pump may be configured as desired in any manner, such as a gear pump, axial piston pump or radial piston pump.
- the motor may be formed as desired in any manner and be, for example, an asynchronous motor, and the adjustment of its speed can be done as needed in any way, for example by means of a frequency converter.
- the driving or setting or lowering or lifting of the plunger takes place on the first lifting height, preferably starting from the third lifting height.
- the plunger In the working phase, as required by the lowering of the plunger, the plunger can be kept at the second lifting height, for example by the pressure chamber is closed and / or separated from the reservoir and tank or is.
- the driving or setting or lowering or lifting of the plunger takes place on the third lifting height preferably without stopping at the first lifting height.
- the maximum pressure that the memory can endure without damage or to which the memory is designed as intended can simply be selected for the pressure guidance variable P S OLL.
- the speed is preferably continuously at speeds from zero to
- Pressure command P S OLL is selected as a function of at least one prevailing in one of the chambers chamber pressure p K.
- the pressure correction value K P can be arbitrarily selected as needed and
- the pressure control variable PSOLL is greater than the chamber pressure p K by a certain percentage. This percentage is for example at least 2% or at least 3% or at least 4% or at least 5% or at least 6% or at least 7% or at least 8% or at least 9% or at least 10% or at least 12% or at least 14% or at least 16 % or at least 18% or at least 20%.
- this percentage is for example at most 2% or at least 3% or at most 4% or at most 5% or at most 6% or at most 7% or at most 8% or at most 9% or at most 10% or at most 12% or at most 14%. or at most 16% or at most 18% or at most 20%.
- the regulation of the accumulator pressure p s takes place in at least one of the phases. It can be provided that
- each cycle has a closing phase for closing the press, a working phase for forming the workpiece, a reset phase for opening the press, and a loading phase for removing a deformed workpiece from the press and inserting a workpiece to be formed in the press in this order;
- the chamber is separated from the memory and connected to a tank or is or the chamber is separated from a tank and connected to the memory or is.
- the plunger can be lowered or moved passively by its own weight and / or actively by a closing drive in the closing direction or actively lifted or moved by a closing drive in the closing direction.
- This closing drive for example, in comparison to a hydraulic drive for the working phase, which is preferably formed by a compression chamber in the cylinder and the memory, be smaller and / or weaker and / or faster and / or for example, have an additional hydraulic drive.
- the plunger is actively lowered or raised or moved by the accumulator in the closing direction.
- the driving of the plunger takes place by a chamber forming the pressing chamber is separated from a tank and connected to the memory. Then it can be provided that in the return phase, the pressing chamber is separated from the memory and connected to the tank or is.
- the plunger can be actively raised or moved in the return direction by a rear part drive or passively lowered or moved by its own weight and / or actively by a rear part drive in the return direction or moved.
- Rear part drive for example, in comparison to a hydraulic drive for the working phase, which is preferably formed by a compression chamber in the cylinder and the memory, be smaller and / or weaker and / or faster and / or for example, have an additional hydraulic drive.
- This additional hydraulic drive preferably has a return chamber in the cylinder, which is separated, for example, by a guided in the cylinder, coupled to the plunger piston from the pressing chamber and separated in the reset phase of the tank and is connected to the memory or is.
- the chamber in the loading phase, is closed and / or separated from the memory and a tank or is.
- the plunger can be held at the third lifting height.
- the driving of the plunger takes place by a chamber forming the return chamber is separated from a tank and connected to the memory. Then it can be provided that in the working phase, the return chamber is separated from the memory and connected to the tank or is.
- the plunger can be actively raised or moved by a press drive in the closing direction.
- This press drive may for example be larger and / or stronger and / or slower compared to the hydraulic drive formed by the return chamber and memory and / or for example have an additional hydraulic drive.
- This additional hydraulic drive preferably has a pressing chamber in the cylinder, which is separated from the return chamber, for example by a guided in the cylinder, coupled to the plunger piston and is separated in the working phase of the tank and connected to the memory or is.
- the charge volume flow in particular for or when regulating the accumulator pressure p s , can be set to zero in any desired manner as required.
- the tank is connected to the pressure port, and that the charge flow, in particular for or when regulating the accumulator pressure p s , is set to zero by connecting a pressure port of the pump to a tank.
- the charge volume flow in particular for or during the regulation of the accumulator pressure p s , is set to zero by setting the rotational speed of the engine to zero. By setting to zero, too rapid a rise in the accumulator pressure p s can be slowed down or even stopped.
- setting to zero can be done quickly.
- the setting can be made to zero energy-saving.
- a charging duration T L is determined, while the
- the charging duration T L is controlled to a charging duration setpoint T S OLL by the speed is set and / or changed accordingly.
- the charging duration setpoint T S OLL can be selected as required,
- This percentage is for example at least 2% or at least 3% or at least 4% or at least 5% or at least 6% or at least 7% or at least 8% or at least 9% or at least 10% or at least 12% or at least 14% or at least 16 % or at least 18% or at least 20%.
- this percentage is for example at most 2% or at least 3% or at most 4% or at most 5% or at most 6% or at most 7% or at most 8% or not more than 9% or not more than 10% or not more than 12% or not more than 14% or not more than 16% or not more than 18% or not more than 20%.
- a cycle duration T z and a charging time T L during which the charging volume flow is greater than zero, as well as one over the
- K N is a speed correction value with 0 ⁇ K N ⁇ n L ⁇ (1-T L : T z ).
- the third correction value K N may be, for example, 0 min “1 or 50 min “ 1 or 100 min “1 or 150 min “ 1 or 200 min “1 or 250 min " 1 or 300 min “1 or 350 min " 1 and the intermediate value n z accordingly 1200 min “1 or 1250 min “ 1 or 1300 min “1 or 1350 min “ 1 or 1400 min “1 or 1450 min “ 1 or 1500 min "1 or 1550 min “ 1 .
- the accumulator pressure p s is controlled by the fact that the charge volume flow to zero and the speed to the
- Nominal speed n N is set.
- the charging time T L over the average load speed n L of the nominal speed N n correspond.
- the charge volume flow through the regulation of Storage pressure p s is set and / or changed such that, in particular in each phase or during the entire cycle, the accumulator pressure p s does not fall below a lower operating pressure pu and / or does not exceed an upper operating pressure p 0 .
- Adhering to the lower operating pressure pu for example, in a memory having a gas as the compression medium, prevent this gas from entering the hydraulic circuit.
- the upper operating pressure p 0 may, for example, be the maximum pressure that the accumulator can endure permanently without damage or to which the accumulator is designed as intended. Then it can be provided that pu ⁇ PSOLL 2 Po applies.
- the stored values are used as initial values.
- the method can already be carried out with at least partially optimized values.
- the accumulator pressure p s is adjusted by means of an adaptive control.
- the pressing chamber or the return chamber Separating the pressing chamber or the return chamber from the tank or the reservoir, and / or each connecting, for example connecting the pressing chamber or the return chamber with the memory or with the tank or connecting the pressure port with the memory or with the tank, and / or each closing, For example, the closing of the pressing chamber or the return chamber, for example by means of valves.
- at least one valve between the reservoir and the compression chamber and / or at least one valve between the reservoir and the return chamber and / or at least one valve between the reservoir and the pressure port and / or at least one valve between the tank and the compression chamber and / or at least one valve between the tank and the return chamber and / or at least one valve between the tank and the pressure port be provided or seated.
- Each valve may be configured as desired in any manner, such as a proportional valve or control valve or riser valve or directional control valve or check valve or pressure relief valve.
- Any proposed method may be configured as desired in any manner and may, for example, have at least one additional phase.
- Each of the presses used in one of the proposed methods may be configured as desired in any manner, such as at least one additional hydraulic cylinder and / or at least one additional ram and / or at least one additional hydraulic pump and / or at least one additional motor and / or have at least one additional hydraulic accumulator and / or at least one additional tank for hydraulic fluid.
- Each provided in this press cylinder can be formed as needed in any way and, for example, have at least one additional pressing chamber and / or at least one additional return chamber. Any pump provided in this press may be used as desired in any manner
- the proposed methods may be combined as desired in any manner, in particular wholly or in part.
- the invention proposes a hydraulic press, in particular for forming workpieces, comprising:
- a hydraulic cylinder having at least one chamber, a plunger coupled to the cylinder and to which a forming tool for forming a workpiece can be coupled; a hydraulic pump having a pressure port,
- a motor coupled to the pump and having a rated speed n N , a hydraulic accumulator connected to at least one of the chambers and the pressure port,
- a hydraulic fluid tank connected to at least one of the chambers
- a storage pressure sensor for detecting the storage pressure p s prevailing in the storage
- control unit which allows operation of the press in cycles and is connected to the accumulator pressure sensor and the motor;
- the engine is designed such that its speed can be set to the rated speed n N and to at least one intermediate value n z for which 0 ⁇ n z ⁇ n N ;
- control unit is designed such that:
- hydraulic fluid is forced from the reservoir into at least one of the chambers in at least one phase of each cycle by the accumulator pressure p s to move the plunger relative to the cylinder;
- the pump delivers hydraulic fluid into the reservoir with a charge flow and the control unit regulates the reservoir pressure p s to a pressure command P S OLL by setting the rotational speed of the engine to the nominal rotational speed n N and to at least one of the intermediate values n z .
- the proposed press can be designed as desired in any manner and, for example, have the control of the accumulator pressure p s in at least one additional phase.
- the proposed press makes it possible to carry out the method proposed according to the first aspect.
- the press additionally has:
- At least one chamber pressure sensor for detecting the in one of Chambers of prevailing chamber pressure p K ;
- control unit is connected to each chamber pressure sensor
- control unit is designed such that in at least one of the phases:
- control unit is designed such that the regulation of the accumulator pressure p s takes place in at least one of the phases.
- each cycle has a closing phase for closing the press, a working phase for forming the workpiece, a reset phase for opening the press, and a loading phase for removing a deformed workpiece from the press and inserting a workpiece to be formed in the press in this order;
- control unit is designed such that it:
- the closing phase moves the plunger to a first lifting height, so that the forming tool touches the workpiece to be formed or is located at a small distance to the workpiece to be formed;
- the ram continues to a second lifting height, so that the forming tool presses against the workpiece;
- control unit is designed such that it separates at least one of the chambers in the closing phase of the memory and connects to the tank or at least one of the chambers separated from the tank and connects to the memory. It can be provided that the control unit is designed such that it causes the driving of the plunger in the working phase by separating a chamber forming the chamber from the tank and connects to the memory.
- control unit is designed such that it separates the pressing chamber from the memory in the return phase and connects to the tank.
- control unit is designed such that it closes at least one of the chambers in the loading phase and / or separates from the storage tank and tank. It can be provided that the control unit is designed such that, in the reset phase, it causes the ram to travel by separating a return chamber forming the chamber from the tank and connecting it to the accumulator.
- control unit is designed such that it separates the return chamber from the memory in the working phase and connects to the tank.
- the charge volume flow in particular for or when regulating the accumulator pressure p s , can be set to zero in any desired manner as required.
- the tank is connected to the pressure port, and that the control unit is designed such that it sets the charge flow stream to zero by connecting the pressure port to the tank.
- the motor is designed such that its rotational speed can be set to zero, and that the control unit is designed such that it sets the charge flow stream to zero by setting the rotational speed to zero. It can be provided that the control unit is designed such that it:
- the control unit is designed such that it:
- a cycle duration T z and a charging duration T L during which the charge volume flow is greater than zero, as well as an averaged over the charging time T L charge speed n L determined; - For at least one subsequent cycle, the speed to a
- control unit is designed such that in the particular cycle:
- control unit thereafter regulating the accumulator pressure p s , in particular exclusively, by setting the charge volume flow to zero and the rotational speed to the nominal rotational speed n N. It may be provided that the control unit is designed such that it adjusts the charge volume flow by regulating the accumulator pressure p s and / or changes that the accumulator pressure p s does not fall below a lower operating pressure pu and / or an upper operating pressure p 0 not exceeds.
- control unit is designed such that it:
- Workpieces use the stored values as initial values.
- control unit is designed such that it can set or set the accumulator pressure p s by means of an adaptive control. Then it can be provided that the control unit is designed such that it at least one of the pressure command variables PSOLL and / or in the adaptive control at least one of the intermediate values n z and / or at least one of the charging duration setpoint values T S OLL and / or at least one of the correction values K P , K N can change or change.
- control unit is connected to the valves.
- control unit may, for example, separating the pressing chamber or the return chamber from the tank or the memory and / or connecting the pressing chamber or the return chamber with the memory or with the tank or connecting the pressure port with the memory or with the tank and or cause the closure of the compression chamber or the return chamber or perform.
- Each valve may be configured as desired in any manner, such as a proportional valve or control valve or riser valve or directional control valve or check valve or pressure relief valve.
- Each proposed press may be formed as desired in any manner and for example at least one additional hydraulic cylinder and / or at least one additional plunger and / or at least one additional hydraulic pump and / or at least one additional motor and / or at least one additional hydraulic accumulator and / or at least one additional tank for hydraulic fluid and / or at least one additional control unit and / or at least one additional pressure sensor.
- everyone Cylinder may be formed as desired in any manner and, for example, have at least one additional pressing chamber and / or at least one additional return chamber.
- Each pump may be configured as desired in any manner and, for example, have at least one additional pressure port.
- FIG. 1 is an overview diagram of a preferred embodiment of a
- FIG. 2 is a graph of the time history of the accumulator pressure in the memory of the press of FIG. 1, the way of the plunger of the press and the
- FIG. 1 schematically shows a preferred embodiment of a hydraulic press 10 which can be operated in cycles, each of which has a closing phase, a working phase, a return phase and a loading phase in this order.
- the press 10 has a hydraulic cylinder 1 1, a plunger 12, a boost pressure pump or hydraulic pump 13, a motor 14, a hydraulic accumulator 15, a Vorhell actuallyer or tank 16 for
- the cylinder 1 1 has two chambers, namely a pressing chamber 1 1.1 and a
- the pump 13 has a suction port 13.1 and a pressure port 13.2.
- the motor 14 is coupled as a drive to the pump 15.
- the memory 15 is connected to the pressing chamber 1 1.1, the return chamber 1 1 .2 and the pressure port 13.2 and formed by way of example as a hydraulic accumulator with a nitrogen-filled pressure vessel.
- the tank 16 is connected to the pressing chamber 1 1.1, the return chamber 1 1 .2 and the suction port 13.1.
- the motor 14 is an example of a induction motor and has a nominal rotational speed n N, which is exemplified 2000 min '1.
- the drive 20 is on one hand connected to the motor 14 and on the other hand to the control unit seventeenth
- the control unit 17 is configured such that the rotational speed of the motor 14 continuously or almost continuously from zero to the nominal speed n N and thus to zero at the rated speed n N and at least one intermediate value can be set n z by appropriately controlling the frequency converter 20, for 0 ⁇ n z ⁇ n N applies ,
- the control unit 17 is also connected to the pressure sensors 18, of which a storage pressure sensor 18.1 for detecting the pressure prevailing in the memory 15
- Storage pressure p s is used, a first chamber pressure sensor 18.2 for detecting the prevailing in the pressing chamber 1 1 .1 working pressure p A and a second
- the control unit 17 is also connected to the valves 19, which are exemplary directional valves and of which a first valve 19.1 between the pressing chamber 1 1.1 and the memory 15 and between the pressing chamber 1 1.1 and the tank 16 is seated, a second valve 19.2 between the return chamber 1 1 .2 and the memory 15 and between the return chamber 1 1 .2 and the tank 16 is seated and a third valve 19.3 between the pressure port 13.2 and the memory 15 and the
- the first valve 19.1 is a 3/3-way valve, so has three connections for hydraulic fluid lines and three
- the second valve 19.2 is a 3/3-way valve and can optionally separate the return chamber 1 1.2 from the tank 16 and connect to the memory 15 or separate from the memory 15 and connect to the tank 16 or separate from the memory 15 and tank 16.
- the third valve 19.3 is a 3/2 way valve, thus has three connections for hydraulic fluid lines and two switching positions, and can selectively disconnect the pressure port 13.2 from the tank 16 and connect to the memory 15 or separate from the memory 15 and connect to the tank 16.
- FIG. 2 are three cycles of a preferred embodiment of a method of operating the press 10 of FIG. 1 and for forming workpieces by means of the press 10 of FIG. 1 schematically illustrated over time the storage pressure p s in the memory 15, the path H of the plunger 12 and the speed n of the motor 14 over time.
- the control unit 17 allows cyclic operation of the press 10 according to this preferred embodiment of the method. It is designed such that in each cycle it lowers the plunger 12 and thus the forming tool 21 coupled to it in the closing phase to a first lifting height H1, in the working phase further lowers to a second lifting height H2 and stops there, in the reset phase back over the first lifting height H 1 and continues to a third lifting height H3 and stops in the loading phase on the third lifting height H3.
- FIG. 2 is to recognize the closing phase on the steeply sloping segment of the H-line to recognize the working phase on the adjoining flat sloping and then horizontal segment, the reset phase to recognize the subsequent flat and then steeply rising segment, and the Beschickphase the it subsequent horizontal segment to recognize.
- the sinking of the plunger 12 and the forming tool 21 in the closing phase reaches or effects the control unit 17 by separating the pressing chamber 11.1 and the return chamber 11.2 from the memory 15 by correspondingly activating the first valve 19.1 and the second valve 19.2 connects to the tank 16.
- the piston 1 1 .3, the plunger 12 and the forming tool 21 are pulled down by their own weight.
- hydraulic oil is sucked from the tank 16 into the pressing chamber 1 1.1 and pressed from the return chamber 1 1 .2 in the tank 16.
- the lowering of the plunger 12 and the forming tool 21 in the working phase reaches or causes the control unit 17 by separating the pressing chamber 1 1.1 from the tank 16 by appropriate activation of the first valve 19.1 and connecting it to the storage 15.
- the memory 15 is almost fully charged after starting the press 10 and thus at the beginning of the first cycle, so that the accumulator pressure p s is just below an upper operating pressure p 0 , which corresponds to the maximum pressure that the memory 15 can withstand without damage in the long run can or on which he is designed as intended.
- the holding of the plunger 12 and the forming tool 21 in the working phase reaches or causes the control unit 17 by the pressing chamber 1 1 .1 separated from the memory 15 and tank 16 by corresponding driving the first valve 19.1 and so closes. Since thus neither the enclosed in the pressing chamber 1 1.1
- Hydraulic oil still flow hydraulic oil in the pressing chamber 1 1.1 can flow, the piston 1 1.3, the plunger 12 and the forming tool 21 are held motionless.
- the lifting of the plunger 12 and the forming tool 21 in the reset phase reaches or causes the control unit 17 by driving by appropriate of the first valve 19.1, the pressing chamber 1 1 .1 separated from the memory 15 and connects to the tank 16 and by corresponding driving the second valve 19.2, the return chamber 1 1.2 separates from the tank 16 and connects to the memory 15.
- the piston 1 1 .3, the plunger 12 and the forming tool 21 are pushed up by the in the memory 15 under the accumulator pressure p s standing hydraulic oil.
- the control unit 17 is also designed such that it loads the memory 15 as needed in all phases, that is, depending on the currently required working pressure p A and return pressure p R , with a charge volume flow.
- the loading of the memory 15 reaches or causes the control unit 17 by adjusting the speed of the motor 14 by correspondingly activating the frequency converter 20 so that it drives the pump 13, and disconnects the pressure connection 13.2 from the tank 16 by appropriately activating the third valve 19.3 connects to the memory 15.
- the pump 13 sucks hydraulic oil from the tank 16 and pushes it with a charge volume flow that of the means of
- Frequency converter 20 set speed of the motor 14 depends, in the memory 15th
- control unit 17 is also designed such that in all phases, the memory pressure p s on a
- Pressure control PSOLL regulates by the speed and thus the
- the setting of the speed for demand-pressure control reaches or causes the control unit 17 by the speed by suitable driving of the
- Frequency converter 20 continuously from zero to the rated speed n N and thus to zero, to the rated speed n N and to intermediate values n z sets, for the 0 ⁇ n z ⁇ n N n.
- the control of the accumulator pressure p s attains or causes the control unit 17, in that in the FIG. 2 first cycle after starting the press 10 first sets the speed to the rated speed n N and then the accumulator pressure p s only by adjusting either the charge flow to zero by setting the speed to zero, or the speed to the
- Nominal speed n N sets as well as a cycle time T z and a charging time T L , during which the charge volume flow is greater than zero, and a calculated over the charging time T L charge speed n L determined.
- control unit 17 for this first cycle has the example
- control unit 17 is also designed such that it again in the second cycle analogous to the first cycle determines the cycle time T z , the charging time T L and the charging speed n L.
- control unit 17 for this second cycle has set, for example, the rotational speed n in an initial portion of the closing phase to 0% of the nominal rotational speed n N , in a subsequent end phase of the closing phase and
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Presses (AREA)
- Press Drives And Press Lines (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012104125A DE102012104125A1 (en) | 2012-05-10 | 2012-05-10 | Method for operating a hydraulic press and a hydraulic press |
PCT/EP2013/059544 WO2013167630A1 (en) | 2012-05-10 | 2013-05-07 | Method for operating a hydraulic press, and hydraulic press |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2846994A1 true EP2846994A1 (en) | 2015-03-18 |
EP2846994B1 EP2846994B1 (en) | 2020-11-25 |
Family
ID=48430745
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13722386.3A Active EP2846994B1 (en) | 2012-05-10 | 2013-05-07 | Method for operating a hydraulic press, and hydraulic press |
Country Status (8)
Country | Link |
---|---|
US (1) | US20150083002A1 (en) |
EP (1) | EP2846994B1 (en) |
JP (1) | JP2015522419A (en) |
KR (1) | KR20150006476A (en) |
CN (1) | CN104284772B (en) |
DE (1) | DE102012104125A1 (en) |
RU (1) | RU2014149771A (en) |
WO (1) | WO2013167630A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106122160A (en) * | 2016-06-20 | 2016-11-16 | 昆山安泰美科金属材料有限公司 | A kind of air pressure trimmer |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2016122874A1 (en) * | 2015-01-26 | 2016-08-04 | Borgwarner Inc. | Accumulator and method of making and using the same |
CN104875420B (en) * | 2015-06-15 | 2017-01-11 | 南通市腾达锻压机床厂 | Downward-jacking hydraulic press system device for explosive press |
ITUA20164346A1 (en) * | 2016-06-14 | 2017-12-14 | Hydronaut S R L | A METHOD AND A PLANT FOR THE CONTROL OF AN ACTUATOR OF A SLIDE OF A PRESS |
DE102016118853B3 (en) * | 2016-10-05 | 2017-10-26 | Hoerbiger Automatisierungstechnik Holding Gmbh | Electrohydraulic drive unit |
JP7120724B2 (en) | 2018-09-13 | 2022-08-17 | 住友重機械工業株式会社 | Hydraulic press and its operating method |
ES2937059T3 (en) * | 2018-10-01 | 2023-03-23 | Salvagnini Italia Spa | sheet metal working machine |
IT201800009060A1 (en) * | 2018-10-01 | 2020-04-01 | Salvagnini Italia Spa | HYDRAULIC DRIVE SYSTEM FOR A PUNCHING APPARATUS |
EP3696327B1 (en) * | 2019-02-15 | 2021-02-24 | ABI Anlagentechnik-Baumaschinen-Industriebedarf Maschinenfabrik und Vertriebsgesellschaft mbH | Excavation device |
RU2764536C1 (en) * | 2021-04-16 | 2022-01-18 | Валерий Владимирович Бодров | Method for controlling the movable traverse of a hydraulic press |
KR102633567B1 (en) * | 2022-04-29 | 2024-02-05 | (주)비아트론시스템 | Substrate Laminating Device with Hybrid Press |
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DE2747548C2 (en) * | 1977-10-22 | 1986-04-17 | Thyssen Industrie Ag, 4300 Essen | Press with control circuit |
DE3712225A1 (en) * | 1987-04-10 | 1988-10-27 | Sempell Armaturen Gmbh | Hydraulic pump system |
DE19842534A1 (en) * | 1998-08-01 | 2000-02-03 | Mannesmann Rexroth Ag | Hydrostatic drive system for an injection molding machine and method for operating such a drive system |
DE19958256B4 (en) * | 1999-12-03 | 2007-12-06 | Bosch Rexroth Aktiengesellschaft | Accumulator arrangement |
US7234298B2 (en) * | 2005-10-06 | 2007-06-26 | Caterpillar Inc | Hybrid hydraulic system and work machine using same |
DE102007027603A1 (en) * | 2007-06-12 | 2008-12-18 | Voith Patent Gmbh | Hydraulic drive, in particular for machine tools, and method for controlling the hydraulic drive |
DE102008038520A1 (en) * | 2008-08-20 | 2010-02-25 | Robert Bosch Gmbh | Device for providing a pressure for a hydraulic consumer and method for providing a pressure |
DE102009037648B4 (en) * | 2009-08-14 | 2018-09-13 | Robert Bosch Gmbh | memory circuit |
DE102009059025A1 (en) * | 2009-12-18 | 2011-06-22 | Robert Bosch GmbH, 70469 | Method for operating a hydraulic working machine |
CN101782085A (en) * | 2009-12-30 | 2010-07-21 | 中国第一重型机械股份公司 | Method for storing and releasing hydraulic energy and gas, water and oil storage device applying same |
DE102010020132A1 (en) * | 2010-05-11 | 2011-11-17 | Hydac Electronic Gmbh | Drive system with at least one hydraulic actuator |
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2012
- 2012-05-10 DE DE102012104125A patent/DE102012104125A1/en not_active Withdrawn
-
2013
- 2013-05-07 WO PCT/EP2013/059544 patent/WO2013167630A1/en active Application Filing
- 2013-05-07 JP JP2015510806A patent/JP2015522419A/en active Pending
- 2013-05-07 CN CN201380024431.5A patent/CN104284772B/en not_active Expired - Fee Related
- 2013-05-07 EP EP13722386.3A patent/EP2846994B1/en active Active
- 2013-05-07 KR KR1020147034381A patent/KR20150006476A/en not_active Application Discontinuation
- 2013-05-07 US US14/399,822 patent/US20150083002A1/en not_active Abandoned
- 2013-05-07 RU RU2014149771A patent/RU2014149771A/en unknown
Non-Patent Citations (1)
Title |
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See references of WO2013167630A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN106122160A (en) * | 2016-06-20 | 2016-11-16 | 昆山安泰美科金属材料有限公司 | A kind of air pressure trimmer |
Also Published As
Publication number | Publication date |
---|---|
WO2013167630A1 (en) | 2013-11-14 |
US20150083002A1 (en) | 2015-03-26 |
CN104284772A (en) | 2015-01-14 |
DE102012104125A1 (en) | 2013-11-14 |
CN104284772B (en) | 2017-07-07 |
JP2015522419A (en) | 2015-08-06 |
KR20150006476A (en) | 2015-01-16 |
RU2014149771A (en) | 2016-07-10 |
EP2846994B1 (en) | 2020-11-25 |
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