AT520167B1 - Hydraulic system for a molding machine - Google Patents

Abstract

Hydraulic system (1) for a shaping machine (2), with at least one hydraulic supply device, in particular a hydraulic pump (3) or a hydraulic accumulator, at least one hydraulic line (4), at least one consumer (5), in particular a piston-cylinder unit, wherein hydraulic fluid can be fed to the consumer (5) via the hydraulic line (4), at least one valve (6) arranged in the hydraulic line (4), wherein the valve (6) comprises a housing (7) and at least one, relative to the housing (7) movable actuator (8) for adjusting the flow rate of hydraulic fluid through the valve (6), and a control device (10) which is adapted to process parameters (P), which at one with the forming machine (2) performed shaping process occur to set and / or to calculate and / or receive via an interface, wherein the control device (10) a valve regulator (9) for Actuation of the actuator (8), wherein the valve regulator (9) is adapted to perform a control of at least one shaping process variable (F), which occurs in a shaping process performed with the forming machine (2).

Description

Description: The invention relates to a hydraulic system for a shaping machine, with at least one hydraulic supply device, in particular a hydraulic pump or a hydraulic accumulator, at least one hydraulic line, at least one consumer, in particular a piston-cylinder unit, with the hydraulic pump providing the hydraulic fluid via the hydraulic line Consumer can be supplied, at least one valve arranged in the hydraulic line, the valve having a housing and at least one actuator which can be moved relative to the housing for adjusting the flow rate of hydraulic fluid through the valve, and a control device which is designed to process parameters which are used for a shaping process carried out with the shaping machine occur, to be determined and / or to be calculated and / or to be received via an interface, the regulating device having a valve controller for controlling the actuator , wherein the valve controller is designed to perform a valve control loop. The invention also relates to a shaping machine with such a hydraulic system and a method for operating a hydraulic system of a shaping machine.

For molding machines, especially for injection molding machines or for injection presses, various types of drives have always been used to trigger movement of various consumers. For example, electrical, mechanical or pneumatic drive devices are used. Hydraulic drive devices, also known as hydraulic systems, are particularly suitable for building up particularly high forces.

General examples of hydraulic drive units for injection molding machines can be found in DE 10 2011 008 923 A1 and DE 10 2011 012 714 A1. In the first-mentioned document, a pressure value is calculated by the pressure regulator from a target pressure stored in the control unit and the actual pressure measured by the pressure sensor, which is then output to the motor driving the pump. In the case of the second-mentioned document, the position of the piston for moving an injection molding machine part is inferred from a measuring device that measures the flow volume. In particular, the flow volume is measured by means of a valve arranged in the hydraulic line for setting the flow volume and / or the hydraulic pressure.

[0004] DE 20 2008 011 337 U1 is about an external control system for injection molding machines for injection molding, a “lower control unit” being provided in addition to the central computer control. These are interconnected via a programmable logic circuit (CPLD - complex programmable logical device). The control core of the "lower control unit" is formed by an integrated circuit (FPGA - field programmable gate array) and is used for temperature determination and control. The individual modules (temperature control module, module for determining the piston stroke, module for monitoring the operation of the electromagnetic cylinder valve, hydraulic station communication module, injection molding machine data transmission module) are directly connected to the FPGA. The FPGA also calculates transmitted data and communicates with the large-scale computer control.

[0005] DE 10 2005 054 769 B3 shows a control system for an injection molding machine. On the one hand, a central control unit for executing cyclical machine program sequences and, on the other hand, a secondary control unit for the cycle-independent processing of time-critical control steps are provided. This additional control unit is designed as an FPGA and is used for signal preprocessing. Basic program sequences of the machine program can also be implemented. These are e.g. B. fixed switching sequences of valves, which are carried out independently of the central control unit in exactly the same chronological order. In contrast to conventional PLC controls, no program runs in the FPGA, but the desired control functions are available as hard-wired electronics after programming. More complex arithmetic functions are preferably not performed by the FPGA, but by the central control unit / 14

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Patent office carried out. This avoids overloading the system.

[0006] WO 01/69094 A1 shows a device for controlling a hydraulic actuator. The circuit boards carrying the electronic circuits are held directly in the valve housing. The controller is designed as a microprocessor-controlled digital controller. In addition to the algorithms for position control of the piston rod of the synchronous cylinder, he is therefore able to process the algorithms for pressure or quantity regulation of the pressure medium supplied to the synchronous cylinder. Instead of position control, speed control, force control or pressure control can also be implemented with the digital controller. The output signal of an electronic control serves as the setpoint for the controller. This control is a freely programmable sequence control with NC and or PLC functionality. This sequence control is programmed by the user. The independence of the user when programming from the manufacturer results in a high degree of flexibility. Above all, the process know-how of the user remains protected in this way. The controller has an interface to a local bus system and to a global bus system, via which there is a connection to a higher-level controller. A disadvantage of this last-mentioned document is that the controller (corresponds to the valve controller) for the position of the valve piston (corresponds to the actuator) of the valve is designed as an analog controller. This means that the valve piston can follow the setpoint as quickly as possible, but it is not possible to use the valve controller for other purposes.

Similar regulators are also apparent from EP 0 995 578 A2 and WO 2004/031593 A1.

In the course of digitization and the development of bus couplings of continuous valves, a certain amount of computing power is available on these valves. In addition, however, the response times through the bus are becoming more critical since, compared to analog interconnections, the bus clocking is also lost. (Major leaps in development in the reduction of bus cycle times are not expected in the near future.) Classic pressure controls on the valve - see last-mentioned document - are however relatively simple and delimited and do not know the overall system. This differentiates the pressure regulation on the valve and the current regulation of the pressure on a central control. The injection pressure control can be mentioned as an example. This regulation includes process parameters of the plastic melt (such as the compression module), but also others such as the battery pressure or spray stroke. However, these parameters are not known to the previously used valves with pressure control, so that this leads to poor performance despite the short sampling times.

The object of the present invention is therefore to provide an improved hydraulic system compared to the prior art or an improved method for operating the hydraulic system. In particular, the performance of the regulation is to be improved.

[0010] This is achieved by a hydraulic system with the features of claim 1. Preferred embodiments are specified in the dependent claims.

Accordingly, it is provided according to the invention that the valve controller is designed to control at least one shaping process variable which occurs in a shaping process carried out with the shaping machine and relates to the physical shaping process, and to work through a control law on the basis of the process parameters, so that the valve control loop in the valve controller and a shaping process size control loop can be carried out. This means that control processes that do not directly affect the valve but other components of the molding machine are also carried out by the valve controller. By performing the process control - and not just the valve control - directly on the valve controller, a faster response time and thus a more precise control can be achieved. In particular, a control directly on the valve controller avoids data transmission via a fieldbus of the machine. The fieldbus is

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However, this is not always the case for certain shaping processes or certain parts of shaping processes, in particular when injecting as part of an injection molding process.

This applies in particular in cooperation with the selection of a rule based on the process parameters or a phase of the shaping cycle. The precise adaptation of the control law and the improved control system result in the particularly fast reaction and quality of the control made possible by the invention. The valve controller is preferably designed to select a control law for the control of the at least one valve on the basis of the process parameters and / or a phase of the shaping cycle, if necessary first and then to calculate or process it.

The process parameters serve to describe the shaping process or process step currently active on the shaping machine and can be used to characterize this. These process parameters therefore also describe the system to be controlled (controlled system). The description of the controlled system thus consists of a part that is fixed based on the machine properties (machine parameters) and a variable part that depends on the process or process step. If the process parameters change or differ from one process to another, it is advantageous to use this information in the control law. In order to achieve optimal control behavior for a process or process step, the controller can be adapted to this.

From a control point of view, all process parameters can be used to describe the system, which can change due to the process or the process step and influence the input / output behavior or the disturbance behavior of the controlled system. In addition to the effect on the system gain, the effect on the time behavior of the controlled system can also be taken into account.

[0015] Usually, the controls are parameterized so robustly that they show stable behavior for a large range of process parameters. However, this means that they are not optimal for a specific application, which, for example, causes larger deviations in the event of faults or longer settling behavior when the setpoint changes. This can be counteracted by the invention.

The valve controller of the valve only has to be constructed such that it can be used to control at least one shaping process variable. For this purpose, a control law can be selected by the valve controller, for example.

It is preferably provided that the valve controller has an internal circuit, for example an FPGA or a PLC (programmable logic controller - corresponds to a memory programming controller), for the calculation or processing of a control law for the shaping process variable.

Furthermore, it is preferably provided that the valve controller has at least one output for outputting control signals to the at least one actuator.

[0019] It is preferably provided that the control device has a control part. In principle, it is possible that the valve controller has no connection or only a temporary connection to such a (higher-level) control part, but only receives signals from sensors. However, it is preferably provided that the valve controller is connected to the control part of the control device via a signal line, preferably via a fieldbus.

According to a further exemplary embodiment, it is provided that the valve controller has at least one input, in particular a signal input interface. In previous valve regulators it was the case that this signal input interface only received setpoints originating from the control part and actual values originating from the valve itself, from which the regulation or control loop of the actuator of the valve then took place.

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It is now preferably provided that the regulating device is designed in such a way that the valve controller can use the signal input interface to specify setpoints for regulating the at least one shaping process variable. Not only is a control variable for the valve regulated, but a control law for a shaping process variable is processed by the valve controller.

[0021] It is particularly advantageous if the valve controller is designed to receive values determined via the signal input interface, preferably measured values from at least one sensor. Determined values can also be calculated values (such as the compression module), which are determined on the basis of a predetermined calculation. Thus, the valve controller not only receives values from the control device, but values from sensors or corresponding computing units are carried out directly on the valve controller. As a result, the transmission of these determined values is not dependent on the clock of the fieldbus between the valve controller and the control unit.

In general, a wide variety of types of known sensors can be used to determine various values. For example, a differential pressure sensor can be provided. This is preferably integrated directly into the valve. This differential pressure sensor can be constructed in the form of two simple pressure sensors which are arranged before and after the valve seat in the hydraulic line.

Typical (measurement) values for shaping processes are listed below, the values representing at least one of the following variables:

a hydraulic pressure measured by a pressure sensor arranged in the hydraulic line, preferably directly in the area of the valve,

- a temperature of the hydraulic fluid,

a position, preferably a plasticizing screw or a molding tool,

a speed, preferably a plasticizing screw or a molding tool,

a pressure of a melt,

a mass and / or volume flow of the melt,

- a temperature of the melt,

- an internal mold pressure

- an injection pressure in the hydraulic cylinder,

- an injection force,

- a speed of the injection screw.

[0024] Possible process parameters can be:

Material parameters of the plastic, in particular compression module of the melt or viscosity of the melt (here nominal parameters e.g. according to a corresponding list or identified parameters, e.g. a compression module, can be used by calculation)

Current working point of the process, in particular position and speed of the screw, melt or cavity pressure, volume of the melt in the screw antechamber (dead volume depending on nozzle and flange), melt temperature or parameters of the other (previous) process steps (e.g. dosing or closing force)

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Tool parameters, especially volume and flow lengths (geometries), e.g. Hot runner volume, tool or hot runner temperature

Parameters of the hydraulic and drive circuit, in particular hydraulic volume, line lengths, cylinder lengths and diameters and current position thereof, oil temperature or the ratio of the swallowing volume of the pump to a parameter or combination of parameters

Process step, in particular a characteristic parameter for the process step (see hydraulic circuit), that is to say, for example, whether the process step is currently pressure-controlled or speed-controlled. [0025] These process parameters thus also contain machine parameters, with unchangeable process parameters being subsumed under machine parameters.

The task of the controller is to control the course of the shaping process and to control or regulate the predetermined molding process variables according to the operator's specifications. Molding process sizes are understood to mean sizes that relate to the physical shaping process. This can affect all movements that can be carried out by the shaping machine. For example, these are movements of the closing side (closing and opening movements of the platen, etc.) or movements of the injection side during the injection process. The following variables can be decisive for the injection process in particular:

Screw position, injection speed, injection pressure at the screw, screw speed

Melt pressure in the screw antechamber, cavity pressure, pressure in the hydraulic cylinder during injection (also back pressure), injection force

Volume flow into the mold, flow front speed, volume flow at the nozzle, and

Sizes for further movements, in particular pump pressure and pump volume flow in general, positions, speeds and pressures of further movement cylinders such as clamping force, contact pressure, ejector etc.

For this purpose, it should generally be stated that “sizes” is understood to mean both a specific size at a specific point in time or a size in the form of a profile during a specific period.

The phase of the molding cycle can include at least one of the following: mold closing, clamping force build-up, injection, holding pressure, mold opening, plasticizing and dosing, regulating back pressure, ejecting, tempering. A consumer of the hydraulic system according to the invention can be used in each of these exemplary phases.

As such, only one valve can be provided in the hydraulic system. This can be arranged, for example, between the hydraulic feed device and the consumer or also between the consumer and a tank, in which case the valve can then be designed as a brake valve in the second variant. However, it is also possible for two or more valves to be present in the hydraulic system, each of which has a valve controller for regulating a shaping process variable.

Protection is also sought after for a molding machine with a hydraulic system according to the invention. It can preferably be provided that the molding machine has at least one injection unit and one clamping unit. Again, it can preferably be provided that the injection unit and the clamping unit have at least one consumer of the hydraulic system. Of course, a large number of (hydraulic) consumers can of course be provided in the molding machine.

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Patent Office [0031] As such, the entire operation of the shaping machine can run fully automatically.

However, an operating device is preferably provided, which has a, preferably touch-sensitive, screen and an input device, preferably operating buttons.

The control device can be formed separately from this control device and can only be connected to the control device in terms of signal technology. However, it is preferably provided that the control device (especially its control part) is an integral part of the operating device. In both cases, essential quantities or values for the operator are shown on the display device and can be influenced via the input device.

The molding machine can also be designed as a hybrid machine. For example, the closing side can be driven electrically and the spraying side hydraulically and vice versa.

The above-mentioned object is also achieved by methods for operating a hydraulic system of a shaping machine, at least one hydraulic supply device, preferably a hydraulic pump, at least one hydraulic line supplying hydraulic fluid to at least one consumer, a valve with a housing and an actuator that is movable relative to the housing is arranged and wherein process parameters, which occur during one of the shaping processes performed on the shaping machine, are determined, calculated and / or received via an interface, the regulating device having a valve controller for adjusting the flow rate of hydraulic fluid and the actuator is controlled by the valve controller, the valve controller performing a valve control loop. According to the invention, it is provided that at least one regulation of a shaping process variable, which occurs in a shaping process carried out with the shaping machine and relates to the physical shaping process, is carried out by the valve controller, and a control law is processed on the basis of the process parameters, so that the valve control loop and a shaping process variable control loop are carried out in the valve controller ,

Further details and advantages of the present invention are explained in more detail below with reference to the description of the figures and with reference to the exemplary embodiments illustrated in the drawings. In it show:

Figure 1 Fig. 2 Fig. 3 schematic a molding machine, schematically a hydraulic system and schematically a valve including valve controller and control device.

In Fig. 1, a molding machine 2, in particular an injection molding machine, is shown schematically. This shaping machine 2 has a clamping unit 16. This clamping unit 16 is composed of the movable platen 20, the drive device 21 forming a consumer 5 for the movable platen 20, the fixed platen 22 and the forming tool 23 mounted on the platen 20 and 22 together with the cavity K formed therein. An injection unit 15 is also arranged on the frame 24 of the shaping machine 2. This injection unit 15 has an injection cylinder 25, an injection screw 26 movably mounted in the injection cylinder 25, a drive device 27 forming a consumer 5 for the injection screw 26 and a filling device 28 for supplying starting material for the plastic melt to be injected into the cavity. Furthermore, the shaping machine 2 has an operating device 17 with a display device 18 and an input device 19. The control device 17 also has the control device 10 (main control) for the molding machine 2. This control device 10 is connected via a signal line 12, preferably via a field bus, at least to the drive devices 27 and 21. In addition, sensors 14 can also be provided, which measure, for example, the injection pressure in the injection unit 15 or the closing force of the clamping unit 16. These sensors 14 also protrude with the control device 10

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The shaping process is controlled or regulated by the control device 10, wherein general shaping process variables F are defined. Shaping process variables F are properties of components of the shaping machine 2, which can have different concrete values. The injection speed or the closing force are given as examples. The control device 10 is designed to control at least one shaping process variable F, which occurs in a shaping process carried out with the shaping machine 2. Every shaping process variable F is influenced by many factors - here called process parameters P. For example, the process parameters compression modulus of the melt and viscosity of the melt are essential for the molding process size clamping force. In addition, the mostly constant process parameters such as tool parameters (volume, flow length, etc.) are also important for the forming process size clamping force. The process parameters P for steps carried out with the shaping machine 2 are determined, calculated or received via an interface by the control device 10. For any parameterization, 10 control laws can be selected by the control device on the basis of these process parameters P. By processing a rule of law based on at least one process parameter P, at least one of the consumers 5 (drive devices 21 or 27) of the shaping machine 2 is controlled or regulated accordingly. In particular, the control device 10 transmits at least one setpoint S _so ii to the corresponding consumer 5. Overall, regulation of the respective shaping process variable F is achieved.

Such a shaping machine 2 has at least one hydraulic system 1, which is shown schematically in FIG. 2. At least one consumer 5 of the shaping machine 2 is acted upon hydraulically via this hydraulic system 1. In the specific case, the drive device 21 for the movable platen 20 or the drive device 27 for the injection screw 26 can be such a consumer 5. In Fig. 2 this consumer 5 is shown schematically as a piston-cylinder unit with a cylinder 29, a piston 30 and a piston rod 31. Hydraulic lines 4 lead from the hydraulic feed device, in this case from a hydraulic pump 3, to the consumer 5, through which hydraulic fluid is conveyed. Instead of (or in addition to) a hydraulic pump 3, a hydraulic accumulator (battery) can also be used. The hydraulic pump 3 is driven by a motor M. At least one valve 6 is arranged in the hydraulic line 4. This valve 6 can be designed, for example, as a servo valve. In addition, at least one sensor 14 is arranged in or on the consumer 5. This detects a measured value S ₁₄ . This measured value S ₁₄ can be transmitted to the control device 10. In the present invention, however, at least one measured value Si _{4 is} transmitted to the valve 6 or the valve controller 9.

In Fig. 3 is symbolically shown how and with which components the control of the hydraulic system 1 and the molding machine 2 takes place. The control device 10 has the valve controller 9 and the (higher-level) control part 33. This Fig. 3 also includes schematically how the valve 6 is constructed. The valve 6 has a housing 7, an actuator 8 and a valve regulator 9 for adjusting the actuator 8 relative to the housing 7. The valve controller 9, which is preferably designed as an FPGA, has an output 11. Control signals S ₈ are output to the actuator 8 via this output 11. The valve controller 9 also has a signal input interface 13. Via this signal input interface 13, the valve controller 9 is connected via a signal line 12 (fieldbus) to the (higher-level) control part 33 of the control device 10 for the molding machine 2.

Basically, the function of the valve controller 9 is such that the valve controller 9 receives a setpoint S _so n from the higher-order control part 33 (for example for a specific piston position). In addition, the valve controller 9 receives an actual value S _ist from a valve sensor 32, which represents the actual piston position. Then, the position of the actuator 8, from the valve controller 9 of the valve 6 (manipulated variable) is regulated so that the actual value corresponding to S _is the set value S is corrected _so n. Accordingly, the valve controller 9 is designed to regulate

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With the present invention, it is now possible for this valve controller 9 to take on additional tasks, as a result of which the overall control or processing of the control laws does not have to be carried out by the higher-level control device 10.

For this purpose, measured values S ₁₄ are transmitted directly to the valve controller 9 by at least one sensor 14. In addition, further process parameters P, which were previously only available to the control device 10, can be transmitted to the valve controller 9. A control law based on the process parameters P (which then also include the measured values S14) is thus processed in the valve controller 9. The valve controller 9 can now not only be used to regulate the valve 6, but the valve controller 9 also takes on tasks that were previously carried out by a higher-level controller. Thus, not only the relatively simple valve control loop is carried out via the valve controller 9, but also a shaping process size control loop is carried out.

It can thus be stated that the pressure control or the flow control - for example an injection movement or a closing movement - is carried out directly by the valve 6 or its valve controller 9. The calculation of the control law is carried out directly on a circuit of the valve 6. In comparison to previous solutions, process parameters are taken into account and a rule of law adapted for the shaping process is implemented. The necessary data comes (e.g. from pressure sensors) via the signal input interface directly at the valve, preferably with a higher clock (100 ps) than the fieldbus, via pressure setpoints (possibly even leading to eliminate the bus dead times), via real-time data from others Movements (e.g. piston position, pump values) or via process data or controller setting values that are not completely real-time or dead-time critical. The latter can be transferred to the valve controller with the bus cycle.

In conclusion, the advantages will be discussed. The control, decoupled from the control device 10, via the valve controller 9 of the valve 6 with higher sampling frequencies leads, particularly at very high injection speeds, to better performance. The sampling frequency of a pressure control with the specified control algorithms is not limited to the cycle time of the bus system, but can be even lower.

LIST OF REFERENCE NUMBERS:

hydraulic system

forming machine

hydraulic pump

hydraulic line

consumer

Valve

casing

actuator

valve controller

control device

Valve regulator output

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Signal line, preferably fieldbus

Singaleingangsschnittstelle

sensor

Injection unit

closing unit

operating device

display device

Input device movable platen

Drive device for movable platen fixed platen

shaping tool

frame

Injection cylinder

Injection screw

Injection screw drive device

filling device

cylinder

piston

piston rod

valve sensor

control part

process parameters

Molding process Size

Control signal to consumers

Control signal at the actuator

setpoint

Measured value from sensor

cavity

Motor for hydraulic pump

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Claims (16)

claims 1. Hydraulic system (1) for a molding machine (2), with - at least one hydraulic feed device, in particular a hydraulic pump (3) or a hydraulic accumulator, - at least one hydraulic line (4), at least one consumer (5), in particular a piston-cylinder unit, hydraulic fluid from the hydraulic pump (3) being able to be supplied to the consumer (5) via the hydraulic line (4), - At least one valve (6) arranged in the hydraulic line (4), the valve (6) being a housing (7) and at least one actuator (8) movable relative to the housing (7) for adjusting the flow rate of hydraulic fluid through the valve (6), and - A control device (10) which is designed to determine and / or calculate process parameters (P) which occur in a shaping process carried out with the shaping machine (2) and / or to receive them via an interface, the control device (10) has a valve controller (9) for controlling the actuator (8), the valve controller (9) being designed to carry out a valve control loop, characterized in that the valve controller (9) is designed to control at least one shaping process variable (F), which occurs in a shaping process carried out with the shaping machine (2) and relates to the physical shaping process, and to execute a control law based on the process parameters (P), so that the valve control loop and a shaping process variable control loop can be carried out in the valve controller (9). 2. Hydraulic system according to the preceding claim, characterized in that the valve controller (9) has an internal circuit for calculating the control law for the shaping process variable. 3. Hydraulic system according to at least one of the preceding claims, characterized in that the valve controller (9) has at least one output (11) for outputting control signals (S ₈ ) to the at least one actuator (8). 4. Hydraulic system according to at least one of the preceding claims, characterized in that the control device (10) has a control part (33) separate from the valve controller (9). 5. Hydraulic system according to claim 4, characterized in that the valve controller (9) via a signal line (12), preferably via a field bus, is connected to the control part (33). 6. Hydraulic system according to at least one of the preceding claims, characterized in that the valve controller (9) has at least one signal input interface (13). 7. Hydraulic system according to claim 6, characterized in that the control device (10) is designed such that the valve controller (9) via the signal input interface (13) setpoints (S _so ii) for controlling the at least one shaping process variable (F). 8. Hydraulic system according to claim 6 or 7, characterized in that the valve controller (9) is designed to receive values determined via the signal input interface (13), preferably measured values (Su) of at least one sensor (14) or calculated values. 10/14 AT520167 B1 2019-05-15 Austrian Patent Office 9. Hydraulic system according to claim 8, characterized in that the determined values, preferably the measured values (S ₁₄ ), represent at least one of the following variables: a hydraulic pressure measured by a pressure sensor arranged in the hydraulic line (4), preferably directly in the area of the valve (6), - a temperature of the hydraulic fluid, a position, preferably a plasticizing screw, a speed, preferably a plasticizing screw, a pressure of a melt, a mass and / or volume flow of the melt, - a temperature of the melt, - an internal mold pressure, - an injection pressure, - an injection force, - a screw speed. 10. Hydraulic system according to one of the preceding claims, characterized in that the process parameters (P) contain target values and / or actual values for one or more of the following variables: material parameters of the plastic, current working point of the molding process, tool parameters, parameters of the hydraulics , Process step. 11. Hydraulic system according to one of the preceding claims, characterized in that the at least one shaping process variable (F) represents at least one of the following variables: screw position, injection speed, injection pressure, melt pressure in the screw cavity, internal mold pressure, volume flow into the tool, flow front speed, screw speed, injection force, volume flow on the nozzle, sizes for further movements of the molding machine. 12. Molding machine (2) with a hydraulic system (1) according to one of the preceding claims. 13. Molding machine according to claim 12, with an injection unit (15) and a clamping unit (16), the injection unit (15) and / or the clamping unit (16) having / having at least one consumer (5) of the hydraulic system (1). 14. Molding machine according to claim 12 or 13, with an operating device (17) which has a display device (18), preferably in the form of a touch-sensitive screen, and an input device (19), preferably control buttons. 15. Molding machine according to claim 14, characterized in that the control device (10) is an integral part of the operating device (17). 16. A method for operating a hydraulic system (1) of a shaping machine (2), - At least one hydraulic supply device, in particular a hydraulic pump (3), is used to supply hydraulic fluid to at least one consumer (5) via at least one hydraulic line (4), - A valve (6) with a housing (7) and an actuator (8) movable relative to the housing (7) is arranged in the hydraulic line (4) and - Process parameters (P), which occur in a shaping process carried out with the shaping machine (2), are determined and / or calculated and / or received via an interface by a regulating device (10), the regulating device (10) being a valve regulator (9 ) for adjusting the flow rate of hydraulic fluid and the actuator (8) is controlled by the valve controller (9), the valve controller (9) performing a valve control loop, 11/14 AT520167 B1 2019-05-15 Austrian Patent office characterized in that at least one regulation of a shaping process variable (F), which occurs in a shaping process carried out with the shaping machine (2) and relates to the physical shaping process, is carried out by the valve controller (9) and a rule law is processed on the basis of the process parameters (P) so that the valve control loop and a shaping process size control loop are carried out in the valve controller (9).