EP3585551A1

EP3585551A1 - Method for operating a workpiece machining system, and workpiece machining system

Info

Publication number: EP3585551A1
Application number: EP18707017.2A
Authority: EP
Inventors: Sergey Martynenko; Jonathan KAISER; Markus Blaich; Peter SCHEMMINGER
Original assignee: Homag Plattenaufteiltechnik GmbH
Current assignee: Homag Plattenaufteiltechnik GmbH
Priority date: 2017-02-24
Filing date: 2018-02-21
Publication date: 2020-01-01
Also published as: CN110382151B; DE102017103866A1; CN110382151A; WO2018153938A1

Abstract

The invention relates to a method for operating a workpiece machining system, in which during a machining process at least one process response variable resulting from the execution of the machining process is at least indirectly detected (112). It is proposed that during the machining process (110) the detected process response variable is compared with the limiting value (114) and that an action is carried out (118) as a function of the result of the comparison.

Description

Method for operating a

Workpiece processing system,

Workpiece processing plant

The invention relates to a method for operating a workpiece machining system, in particular a

Plate processing plant, and a machine tool according to the preambles of the independent claims. A machine tool in the form of a

Plate processing plant is known for example from DE 10 2013 204 409 AI. The well-known

Plate processing plant is a panel sizing saw. On a plate-shaped workpieces or workpiece stacks lying on a feed table are fed program-controlled by means of a program pusher to a sawing device which is arranged on a saw carriage. The saw carriage is movable transversely to the feed direction of the program pusher. The

Sawing device is designed as a circular saw with a corresponding drive, which sets a circular saw blade in a rotary motion. From the market are still other machine tools in the form of plate processing equipment for processing

plate-shaped workpieces known. These include

For example, so-called "nesting machines" in which the plate-shaped workpiece, for example with

Milling equipment and / or drilling equipment is processed.

It is an object of the present invention to provide a method for operating a workpiece processing system

To provide and to create a workpiece machining system with which very efficiently a qualitative

high-quality work result can be achieved. The requirements for an operator of the

Machine tool to be as low as possible.

This object is achieved by a method with the features of claim 1 and a

Workpiece machining system with the features of

solved sibling claim. advantageous

Further developments of the invention are in subclaims specified. In addition, the invention features essential features in the following description and in the accompanying drawings. These features may be essential to the invention both alone and in different combinations.

The inventive method is characterized in particular by the fact that during the processing process, the detected process response variable is compared with the limit, and that depending on the result of the comparison, an action can be triggered.

An advantage of the method according to the invention and the machine tool according to the invention is that both the production of defective parts and damage to the tool of the workpiece processing machine can be avoided. This is achieved by everyone

Machining process limits are set for the process response variables. Unnecessarily big

Tolerance values are thereby avoided, so that the

Workpiece machining system can be operated with the best possible efficiency.

It is understood that the triggering of an action, depending on the result of the comparison, does not mean that an action is triggered in each case. Rather, it can

Of course, if the result of the comparison is that the process response size has not reached or has not reached the limit, then none at all Action is triggered and instead the processing process is continued unaffected.

In principle, of course, it goes without saying that if a limit value is exceeded during an editing process and an action is triggered, the action can then be reversed at a later time during the same machining process when the limit value is no longer exceeded. As a result, an adjustment to changing processing conditions, for example caused by the presence of. Can already during a machining process

Irregularities in the workpiece, done.

A first development of the method according to the invention is characterized in that first before a

envisaged editing process, a record is selected from a database. This links a limit of the process response variable with at least one process specification variable which is a frame condition of a

Pretending machining process. The data set is selected from a plurality of data records such that the

Process input variable (s) of the data set as best as possible with the respective process input variable (s) of the data set

corresponds to the intended processing process or

to match. The respective machining process is thus defined by the process specification variables, which describe intended framework conditions under which the intended machining process should run. Thus, a machining process is already associated with such process Answer sizes have been started and carried out, which are best suited for a planned processing process.

A further embodiment of the method according to the invention provides that the process response variable comprises at least one variable from the following group: a variable that is a temperature at a tool during the

Machining process characterized; a size that is a deflection of a tool during the

Machining process characterized; a size

(For example, a frequency), which is a vibration of a tool during the machining process

characterized; a quantity (for example, a frequency) that characterizes a vibration on a tool storage during the machining process; a size

(For example, a power consumption), which characterizes a performance of a tool drive during the machining process; a size (for example, a

Current consumption), which characterizes a power of a feed drive during the machining process; a quantity that characterizes a feed rate of the tool and / or the workpiece. These process response variables describe an actual state of a

Processing process very accurate and are beyond with simple means, such as conventional sensors to detect or determine.

Furthermore, it is proposed that the process default size comprise at least one variable from the following group: a variable (for example a material specification, a Workpiece dimension, a workpiece thickness, as well as specific material properties such as density, composition,

Structure, type of coating, possibly also

summarized by an identification number of the material), which is a property of the workpiece

characterized; a size (for example, a type and type of the tool and its identification number, an age or a state of the tool or a

Machining distance of the tool, for example a cutting path of a cutting edge), which characterizes a property of a tool; a size that one

Engagement depth of a tool in a workpiece

characterized; a size (eg, "very good," "good," "satisfactory") that characterizes a quality objective on the machined workpiece. These enumerated process default values describe very precisely the framework conditions under which the intended machining process is to be executed

Completely .

A further embodiment provides that the process response variable with a second limit, the fixed

is predetermined, compared and an action takes place depending on the result of the comparison. This will

ensures that certain absolute limits, which are independent of the process default values, are never exceeded (or, for certain

Limit values, below). As a result, the plant safety is again significantly increased, and it will be Damage to both the tool and other facilities of the plate processing system avoided.

It is particularly preferred if the action is a

Change a feed rate of a tool and / or workpiece and / or a change in a

Rotational speed of a tool includes. The

Feed rate of the tool - at one

Panel sizing saw, ie the feed rate of the saw carriage - is a particularly important and efficient

Manipulated variable in order to influence the process response variable (in the language of control engineering, ie the controlled variable) during a machining process. The same applies if the tool is stationary and instead the workpiece is moved for the feed rate of the workpiece. The rotational speed of the tool is also an efficient control variable. It is understood that in a more complex control and / or control strategy, both the

Feed rate of the tool or the workpiece and the rotational speed of the tool can be changed.

In a concrete further development, it is proposed that the change in the feed rate be determined on the basis of a mathematical process model, a characteristic curve or a characteristic diagram. Although it is also possible in a particularly simple case, the

Feed rate when a process response reaches a limit to change a fixed value. But becomes a mathematical one Process model, a characteristic or in particular a

Map used, the change can be both taking into account the framework of the

Machining process as well as, for example, the nature and extent of reaching or exceeding the limit are determined, resulting in a finer adjustment of the feed rate and thus the best possible

Maintaining the efficiency of the workpiece machining system is made possible.

It is also proposed that the data sets also include a start value for the feed rate, and that at least when the feed rate is changed (and a predetermined quality target has been reached), a new data record with the changed

Feed rate generated as start value and

is stored. In this way, those in the

Records the database deposited limits and expanded, creating new opportunities for

Improve the machining processes and the efficiency of the workpiece machining system. Above all, this training is already at the beginning of a

Processing process a presumably optimal

Feed rate to achieve an optimal quality target. In addition, through this

Feedback the messages formed by the records

Knowledge base extends what's for development

future improved workpiece machining systems

helpful. In a particularly advantageous variant, it is provided that the feed rate is maximized to such an extent that the at least one detected process response variable just does not reach the corresponding limit value. Here, so to speak, a real regulated operation of

Workpiece processing system realized in which the

Feed rate (of the tool and / or the

Workpiece) is already introduced during the machining process to a maximum possible value. The

The feed rate is thus "learning" to the optimum value, for example, with the progressive wear of the tool

Feed rate adjusted accordingly. As a result, the workpiece machining system is always operated at the maximum possible feed rate, whereby very short processing times and thus a very good efficiency of the plate processing system can be realized.

An advantageous development of the invention

Procedure provides that of the result of the

Comparison dependent action depends on the type of process response variable that is compared to the threshold. This means, for example, that, for example, when a deflection of the tool reaches a limit value, first the feed rate is reduced. If then (if the tool is a saw blade) a minimum limit value for a tooth feed f _{z is} reached, a tool change is triggered as an action. Of the

Tooth feed f _z is defined as follows: f _z = V _f / (z * N _s) where V _f = feed rate

z = number of teeth of the tool

N _s = speed of the tool

In addition, for example, optional

Operator to be instructed in this

Machining process machined workpiece to inspect particularly accurately with regard to the quality achieved.

It is also advantageous if, during a processing process, different process response variables are compared with respective limit values and it is determined that several of the process variables

Response variables exceed the respective limit, the action is carried out according to a ranking of the process response sizes. This is very easy too

program.

Example of a panel saw would have

For example, the process response "tool deflection" is a top priority, as exceeding the limit can not only lead to the production of missing parts, but even damage the tool

Panel saw itself could result. In second place would be the process response variable "vibration of the tool", ie the frequency, for example

significant reduction in processing quality, since This mainly edge chipping and a wave cut are caused. In addition, this tool wear is increased. Third in the

Ranking would be the drive power of that drive, which sets the tool in rotation, here an exceeding of an upper limit. A

Exceeding the upper limit leads to a

Increased tool wear and thus in the long term to a reduction in machining quality. In the long term damage to the drive could also occur. Fourth in the ranking is the process response size

In this case, exceeding the limit value leads to the loss of tool stability and thus to a resulting damage to the tool

for example, by increased deflection. Also, the tool is particularly heavily contaminated by deposits on the cutting, which also reduces the process quality. In the last place in the ranking would be the drive power of that drive, which sets the tool in rotation, and here falls below a lower limit. Such an undershoot indicates a too low feed rate of the tool, which, for example, to a higher

Tool wear and an undesirable

Temperature increase may result.

In a workpiece machining system according to the invention, it is provided as a development that it has at least one sensor device for detecting the process response variable includes. This is easy to implement and allows reliable detection of the process response size.

In a further development, it is proposed that a

Sensor device for detecting a power of a

Feed drive and / or a sensor device for

Detecting a power of a drive of a tool and / or a sensor device for detecting a

Speed of a tool in the region of the respective drive are / is, preferably integrated in this / is. This allows a very reliable detection of the respective process response size.

It is also possible that a sensor device for

Detecting a temperature of the tool and / or a sensor device for detecting a deflection of the

Tool are arranged on a tool holding portion / is and works without contact / work. In this way a very robust detection of these process response quantities is realized.

It is also particularly advantageous if the control and / or regulating device with a superordinate

Production control system is connected, which specifies the process default sizes. Such a production control system may, for example, be a system which has generated a plan by means of which individual parts are to be produced. Through such a plan will be the

Number of individual workpieces specified. That too Material of the workpieces can be specified in this way.

A further embodiment of the invention

Workpiece processing system provides that in the control and / or regulating device, a control loop for controlling the feed rate of the tool and / or for controlling the speed of the tool is realized in response to at least one detected process response size. Thus, even during the editing process immediately on

Changes in the detected process response size react, which means that an optimal processing result can be realized.

Hereinafter, an embodiment of the invention will be explained with reference to the drawings. In the drawing show:

Figure 1 is a schematic plan view of a

Workpiece machining system in the form of a panel sizing saw;

Figure 2 is a front view of a saw carriage of

Panel sizing saw of Figure 1; Figure 3 is a plan view of the saw carriage of Figure 2;

Figure 4 is a functional diagram for explaining a

A method of operating the panel sizing saw of Figure 1; and

FIG. 5 is a flow chart of the method of FIG. 4. In FIG. 1, a workpiece processing system in the form of a plate processing plant as a whole has the reference numeral 10. In the present case, it is designed as a plate dividing saw with which large-format plate-shaped workpieces 12 or workpiece stacks can be divided into smaller workpieces 14 by sawing operations. In other embodiments, the panel processor is not as

Panel sizing saw but designed as a milling device and / or as a drilling device for working plate-shaped workpieces. Such systems are also called

In addition, any combination of the mentioned types of

Plate processing equipment possible. In principle, however, quite different types of workpiece machining systems are conceivable, for example quite generally drilling units or CNC milling units.

The panel sizing saw 10 includes a feed table 16, which is usually formed as a roller table. To the

Feed table 16 is followed by a machine table 18, and to these again connects to a discharge table 20, which consists in the exemplary embodiment shown of four separate segments (without reference numerals). The machine table 18 and the removal table 20 are preferably designed as air cushion tables.

In the machine table 18 a indicated in Figure 1 by a dash-dotted line 22 sawing gap is present. Below this, a saw carriage 24 is arranged corresponding to a double arrow 26 by means of a not drawn feed drive can be moved. Above the machine table 18 is a pressure bar 28th

arranged. This can be moved perpendicular to the plane of the figure 1. In the region of the feed table 16, a program pusher 30 is arranged, which can be moved in accordance with a double arrow 32. On the program slider 30, in turn, a plurality of collets 34 are attached, of which for reasons of clarity in Figure 1, only one is provided with a reference numeral.

To the panel sizing 10 also includes a

Operating terminal 36, which is formed in the present case by a keyboard 38 and a screen 40, and a control and regulating device 42, which only symbolically by a

Square is indicated. The control and regulating device 42 controls and regulates the operation of the Plattenaufteilsäge 10. To this end, it receives signals from various

Sensor devices, including the symbolic drawn in Figure 1 sensor devices 44 and 46, which may each again comprise a plurality of individual sensors, and will be discussed in more detail below. To be controlled by the tax and

Control device in particular the program pusher 30, the collets 34, the saw carriage 24 with the on it

located saws and the pressure bar 28th

The control and regulating device 42 has inter alia a processor 48 and a memory 50. The control and regulating device 42 may be, for example, a conventional PC. In the memory 50 is

Software stored, which for the execution of programmed and designed different methods.

The saw carriage 24 and parts of the machine table 18 are shown in more detail in Figures 2 and 3. The saw carriage 24 comprises a plate-shaped

Tool holding section 52, which by means of a not

shown and belonging to the feed drive drive motor on rails 54 which on a support structure (not

shown) of the machine table 18 are fixed, according to the double arrow 26 is movable. Of the

Tool holding portion 52 carries two rotary tools in the form of a main saw blade 56 and a

Scoring saw blade 58. They are movable in the vertical direction to produce a desired depth of engagement in the stack of workpieces 12. The two drives for the main saw blade 56 and the scoring saw blade 58 bear in Figure 3, the reference numerals 60 and 62. The two drives 60 and 62 are also of the control and

Control device 42 controlled so that they rotate at a very specific rotational speed.

The drawn in Figure 1 sensor devices 44 and 46 are used to detect a feed rate V _{f of} the saw carriage 24 and for detecting a power P _v

(For example in the form of a current consumption) of

Feed drive of the saw carriage 24. The sensor devices 44 and 46 may for example be arranged in the region of a drive motor (not shown) of the saw carriage 24. In Figures 2 and 3 are more Sensor devices 64-72 drawn. The sensor device 64 serves to detect a temperature T _{s of} the

Main saw blade 56. It is located on the tool holding portion 52 of the saw carriage 24 behind the main saw blade 56 and can contact, for example by means of

Thermography work. Alternatively, a

Temperature sensor, for example in the form of a

Thermocouple be arranged on the main saw blade 56, preferably in the vicinity of the radially outer edge.

The sensor device 66 serves to detect a distance between the main saw blade 56 and the

Tool holding section 52, resulting in the operation of

Panel Saw 10 of the control and regulating device 42, a deflection A _{s of} the main saw blade 56 relative to a zero position and a vibration value dA _s

(For example, a frequency) of the main saw blade 56 is determined. It is also here on

Tool holding portion 52 of the saw carriage 24 and detects the distance contactless, for example by means of ultrasound. The sensor device 68 serves to detect a vibration value dA _w (for example, a frequency) of the tool holding section 52 itself. It is also arranged on the tool holding section 52 and can

For example, include a conventional vibration sensor.

The sensor device 70 is used to detect a rotational speed N _{s of} the main saw blade 56. It is preferably arranged in the region of the drive 60 or integrated in this. The sensor device 72 finally serves to detect a power P _s, for example in the form of a current consumption of the Drive 60 of the main saw blade 56. This is also present in the area of the drive 60

drawn. It can also be integrated in the drive 60, but can also be arranged remotely from the drive 60, for example, in the region of an activation of the drive 60.

In general, a machining process is as follows: The stack of workpieces 12 is placed on an in

Feed direction rear edge of the collets 34 of the

Program slider 30 and taken by a movement of the program pusher 30 successively fed to the machine table 18 and the saw carriage 24, where he by a movement of the saw carriage 24 according to the double arrow 26 by a

Pruned by the scoring blade 58 and scored by a subsequent main section by means of the

Hauptägeblatts 56 is divided. During processing by the main saw blade 56 and the scoring saw blade 58, the workpiece stack 12 is pressed by the pressure bar 28 against the machine table 18 and thereby fixed.

An operator, designated by the reference numeral 76 in FIG. 1, can remove the divided workpieces 14 at the removal table 20. In detail, however, the above-described machining process is performed in accordance with the functional diagram drawn in FIG. 4

Operator specified a machining task. For this purpose, the operator 76 inputs values for process default variables to the keyboard 38 of the operating terminal 36, wherein these Process default values define the framework conditions of the intended machining process. in the

Function block 74 will be values of process default sizes but also of a (not shown)

Production control system defined or automatically on the

Based on the entered by the operator 76 or determined by the production control system process default sizes determined. The above-mentioned production control system may, for example, be a system which has generated a cutting plan by means of which individual parts, for example for furniture, are to be produced from the individual plates of the workpiece stack 12. By such a cutting plan and the number of individual plates of the workpiece stack 12 and thus the height of the workpiece stack 12 is specified. Also, the material of the workpieces can be specified in this way. It would also be conceivable, however, for basically all process parameters to be specified by the production control system to the workpiece processing system, in the present case to the control and regulating device 42 of the panel-sizing saw 10,

be transmitted.

To those in function block 74 to define the

Processing task useful process specification variables include: the material of the workpieces of the workpiece stack 12 and the thickness or height of the workpiece stack 12. The above sizes are therefore those that Properties of the workpiece stack 12

characterize.

Type and type as well as state and / or age or running time of the main saw blade 56, so sizes, the properties of the tool characterizing.

The so-called engagement depth of the tool in the workpiece.

(4) A quality target on the machined workpiece. For example, this quality goal may have the value "very good," "good," "satisfactory." But finer grades of the quality goal, such as grades or points, may also be possible.

It is also possible that the quality goal is described by several quality features, and that from these, for example, after a

predetermined weighting key a value for a total quality characteristic is determined. In addition, it is possible to use further standard values for quality features which are customary in practice, for example for the evaluation of edge breakouts and positional deviations of a machined surface.

In accordance with the values of the process default values defined in function block 74, a database 78 is entered

Record selected. The in the database 78

stored records link limits G ± of Process response sizes with specific values of process default sizes. The selection of the data record is carried out in such a way that the values of the process preselected variables of the intended processing process defined in function block 74 match as well as possible with the values of the corresponding process preselected variables of the selected data record. This is done according to a ranking, where

Preferably, the quality target has the highest priority on the machined workpiece.

The process response quantities are those quantities that result during the execution of the machining process in response to the process default values and that are detected by the sensor devices 64-72 and / or determined by the control and regulating device 42. The in the

Datasets of database 78 contained limits of

Process response variables define those values of the process response quantities that are specific to the process and the

Process preselected quantities defined processing process should not be exceeded or undershot.

It is understood that the datasets of the database can link the specific values of process default sizes not only to limits of process response sizes, but to other sizes. For example, a rotational speed of the main saw blade 56 and / or the

Scoring saw blade 58 and a feed rate of the saw carriage 24 may be linked to the process default sizes and in this way for the intended Machining process can be specified at least as start value.

A function block 80 symbolizes the execution of the actual machining process, as has already been generally described above.

A function block 82 symbolizes a process monitoring for the machining process 80. For this purpose, the temperature T _{s of} the main saw blade 56, the deflection A _s and the vibration value dA _s of the. By means of the sensors 64-72

Main saw blade 56, the vibration value dA _w of

Tool holding portion 52, the speed N _s of

Main saw blade 56, and the current consumption P _{s of} the drive 60 of the main saw blade 56 detected or determined, and by means of the sensor means 44 and 46 the

Feed rate V _{f of} the saw carriage 24 and the current consumption P _{v of} the drive of the saw carriage 24 detected or determined. In this function block 82, therefore, the process response quantities are detected or determined.

A function block 84 symbolizes the during the

Carrying out the machining process

continuous comparison of the detected or determined process response variables T _s , A _s , dA _s , and P _s with the boundaries Gi, which were predetermined by the data set selected from the database for the specific processing process. This from the specific machining process

dependent limits G ± are provided in function block 86. In addition, the function block 84 is also for a comparison of the detected in the function block 82 or determined process response variables T _s , A _s , dA _s , and P _s with absolute and so far firmly predetermined limits G _x , which are provided in a function block 88. These absolute limit values G _x do not depend on the specific processing process or on the data set selected for this, but are rigid for the specific one

Workpiece machining system, in this case the

Panel sizing 10, predetermined.

Depending on the result of the comparison in function block 84, an action is triggered in function block 90. This consists in this case in a change in

Feed rate V _{f of} the saw carriage 24. In an embodiment, not shown a

Workpiece processing system, in which the tool is stationary and instead the workpiece is moved relative to the tool, the action would be in a change of

Feed rate of the workpiece exist. In another embodiment, not shown, the action could also include a change in the rotational speed or rotational speed of the tool, in the present case of the main saw blade 56.

In the function block 84, as already mentioned above, a plurality of process response quantities T _s , A _s , dA _s and P _{s are} compared with corresponding limit values G ± and G _x . The action in function block 90 depends on whether only one of the

Process response values T _s , A _s , dA _s and P _s exceeds the corresponding limit value G ± or G _x , or whether at the same time several of the detected or determined process variables Response sizes T _s , A _s , dA _s and P _s exceed their respective limits G ±. In the latter case, the action is selected according to a ranking of the process response quantities T _s , A _s , dA _s and P _s . The ranking is preferably as follows:

1. deflection A _{s of} the main saw blade 56,

2. vibration value dA _{s of} the main saw blade 56,

3. drive power P _s (upper limit) of the drive 60 of the main saw blade 56,

4. Temperature T _{s of} the main saw blade 56, and finally

5. Drive power P _s (lower limit).

Basically, however, it should be noted that this

Ranking does not have to be rigid. Rather, it can depend on the processing task (function block 74) as well as on the

Desire of the operator 76 and their priorities.

For example, the operator 76 or the

Production control system prioritize a process time that is as short as possible or lower than the highest possible one

Machining quality. Depending on this could be the

Change ranking accordingly.

If the deflection A _{s of} the main saw blade 56 exceeds a corresponding limit value G _As , the

Feed rate V _f reduced by a value xi.

In addition, this is reduced by a value xi

Feed rate V _f with a minimum allowable tooth feed f _z for the current machining process, ie in this case the current cutting task, compared. The tooth feed f _z is defined as follows: f _z = V _f / (z * Ns) where V _f = feed rate

z = number of teeth of the tool

N _s = rotational speed of the tool If, at a reduced feed rate V _f, the minimum allowable tooth feed f _{z is} reached or undershot, the operator 76 is instructed, for example, by a

corresponding display on the screen 40 of the

Operator terminals 36 requested a tool change. In an embodiment not shown, the

Tool change automatically. The prerequisite for this is the presence of a corresponding automatic

Tool changer and a tool magazine. If the oscillation value dA _s exceeds a corresponding limit value GdAs, the feed rate V _{f is} increased by a value X 2. If this does not lead to a reduction of the oscillation value dA _s , the feed rate V _{f is} reduced, for example, by a value 2 * X2.

If the drive power P _{s of} the drive 60 of the main saw blade 56 exceeds an upper limit value G _{Ps max} , the feed rate V _f is reduced by a value X3. Here too, the value reduced by the value X3 is additionally reduced

Feed rate V _f with a minimum allowable tooth feed f _z for the current cutting task compared. If, at a reduced feed rate V _f, the minimum tooth feed f _{z is} reached or undershot, a tool change is again initiated or automatically carried out.

If the temperature T _{s of} the main saw blade 56 exceeds a limit value G _Ts , it is first checked whether a thickness of the workpiece stack 12 exceeds a limit value. If this is the case, the feed rate V _{f is} increased by a value X4. If this does not lead to a reduction in the temperature T _s , the feed rate V _f is reduced here by a value of 2 * x ₄ , for example.

If the drive power P _{s of} the drive 60 of the main saw blade 56 falls below a lower limit value G _{Ps m} i _n , the feed rate V _{f is} increased by a value X5.

In other words, for the four process response quantities A _s , dA _s , P _s and T _s, a total of five comparisons are performed with corresponding limit values G ±, which basically corresponds to the principle according to five separate control loops. These control loops are prioritized according to the ranking listed above. It goes without saying that no action takes place if none of the limit values G ± or _{Gx is} exceeded or undershot.

It was mentioned above that the action can consist in a change of the feed rate V _f by values X1-X5. The size of the values X1-X5 can either be rigidly predetermined, or it can be determined in function block 90 using a mathematical process model, a characteristic or a multi-dimensional map depending on the scope of the

Exceeding the limit can be determined. As can be seen from FIG. 4, the functional block 82 sends a feedback message to the database 78. This has it

The following: is the comparison in

Function block 84 found that of one of the process response variables T _s , A _s , dA _s and P _s, the corresponding limit value G ± is exceeded or fallen below, is a new

Data set generated and fed into the database 78 and stored there, which changed due to the result of the comparison in function block 84

Feed rate V _f as a starting value in the form of a process default size associated with the other process default sizes and limits.

Not shown in Figure 4, but also possible that the feed rate V _f during a

Editing process or while immediately

successive machining processes on the same or the same workpiece or workpiece stack is controlled so that at least one of the detected process response variables T _s , A _s , dA _s and P _s just does not reach the corresponding limit value G ±. So it will be such a scheme

realized at the feed rate

self-learning to the optimal (maximum)

Feed rate is introduced. It is also possible that the feed rate V _f during a machining process or during

immediately following processing processes on the same workpiece or workpiece stack is controlled so that the detected process response variables T _s , A _s , dA _s and P _s do not exceed the stored and associated with the quality target process response sizes. So it is realized such a scheme that the

Feed rate V _f to the optimal (maximum)

Feed rate for the given quality target taking into account the progressive

Tool wear is reduced.

FIG. 5 shows a flow chart of the method for

Realization of the above in connection with FIG. 4

explained functional principle shown. The method begins in a block 102. In a block 104, the process default sizes are defined, according to the

Function block 74. In a block 106, the records are retrieved from the database 78. In a block 108, the corresponding limits G ± for the process response quantities are extracted from the data sets. In block 110, the actual processing process is started, corresponding to function block 80 of FIG. 4. In a block 112, the process response quantities T _s , A _s , dA _s , dA _w and P _s are detected, corresponding to function block 82 of FIG.

In a block 114, the detected process response quantities T _s , A _s , d A _s and P _{s are} compared with the corresponding limits G ±. If none of the process Response sizes T _s , A _s , dA _s and P _s the respective limit G ±, in a block 116, no reaction. Otherwise, an action takes place in a block 118, for example in the form of a change in the feed rate V _{f of} the saw carriage 24. Subsequently, in 120 the process response variables T _s , A _s , d A _s and P _{s are} compared with the corresponding fixed limits G _x . If none of the process response variables T _s , A _s , dA _s and P _{s reaches} the respective limit value G _x , no action takes place in a block 122. Otherwise, an action is taken in a block 124, again

for example in the form of a change in the

Feed speed V _{f of} the saw carriage 24.

In a block 126 it is checked if it has previously been to a

Exceeding or falling below the limit values G ± or G _{x has} come. If the answer is yes, it is checked in block 128 whether the quality of the processing performed by the

Machining process has been achieved on the workpiece, is fine. For this purpose, the operator 76 a processed

Inspect workpiece 14 and make a corresponding assessment ("very good", "good", "satisfactory", "not good")

for example, by means of the keyboard 38 or another type of input device (for example speech recognition) of the control and regulating device 42. Conceivable in an embodiment not shown, however, would be that a machined workpiece by means of a

automated device is subjected to quality control. Such an automated device could be, for example, one or more CCP cameras

and / or tactile sensors. In this case, this would be automated setup the result of

Control and quality control automatically

Communicate control device. If the machined workpiece 14 is in order, a new record is generated in a block 130, which, due to the exceeding or

Falling below a limit G ± or G _x changed feed rate V _f as a process default size

contains, and this record is fed into the database 78 and stored there. In this way, this changed feed rate V _f as new

Process default size are used in a corresponding future intended processing process.

The method ends in a block 132.

In principle, of course, it goes without saying that if a limit value is exceeded during the machining process and an action is triggered, the action can then be reversed at a later time during the same machining process when the limit value is no longer exceeded.

Claims

claims

1. A method for operating a

Workpiece machining system, in particular a

Plate processing plant (10), wherein during a processing process, at least one process response variable resulting from the execution of the

Machining process results, at least indirectly detected (112), characterized in that

during the editing process the detected

Process response size is compared with a limit of the process response size (114) and depending on the result of the comparison, an action is taken (118).

2. The method according to claim 1, characterized in that before a designated processing process (110) a record from a database (78) is selected (106), the limit of the process response size with at least one process default size, the one

Frame condition of a machining process, the record of a plurality of data records being selected (106) such that the process input variable (s) of the record best matches the respective process specification variable (s) of the intended machining process . to match.

3. The method according to any one of the preceding claims, characterized in that the process response size at least one size from the following group

includes: a size representing a temperature at a tool during the machining process

characterized; a size representing a rotational speed of a tool during the machining process

characterized; a size that is a deflection of a tool during the machining process

characterized; a size that is a vibration of a tool during the machining process

characterized; a variable that is a vibration at a tool storage during the

Machining process characterized; a size that is a power of a tool drive during the

Machining process characterized; a size that is a power of a feed drive during the

Machining process characterized; a quantity that characterizes a feed rate of the tool and / or the workpiece.

4. The method according to any one of claims 2 or 3, characterized in that the process default size

at least one size from the following group

includes: a size that is a property of

Characterized workpiece; a size that one

Characterized property of a tool; a size characterizing an engagement depth of a tool into a workpiece; a size that one

Quality objective characterized. Method according to one of the preceding claims, characterized in that the process response variable with a second limit value, which is fixed, is compared (120) and depending on the result of the comparison, an action takes place (124).

Method according to one of the preceding claims, characterized in that the action is a

Change a feed rate of a

Tool (56) and / or workpiece and / or a

Change a rotational speed of a tool (56) includes.

A method according to claim 6, characterized in that the change in the feed rate is determined based on a mathematical process model, a characteristic curve or a characteristic field.

Method according to one of claims 6 or 7, characterized in that the data records also a

Include starting value for the feed rate, and that at least when the

Feed rate is changed, a new record with the modified feed rate is generated as a start value and stored (130).

Method according to one of the preceding claims 6, 7 or 8, characterized in that the

Feed rate is maximized so that the at least one detected process response size just does not reach the corresponding limit.

10. Method according to one of the preceding claims, characterized in that the action dependent on the result of the comparison depends on the type of process response variable which is compared with the limit value.

11. The method according to any one of the preceding claims, characterized in that when different process response variables are compared with respective limits during a processing process (114) and it is determined that a plurality of the process response quantities the respective limit value

The action corresponding to a ranking of the process response sizes is performed (118).

12. workpiece machining system, in particular

Plate processing system (10), with at least one tool (56) for machining workpieces, a control and / or regulating device (42) and a

Detection device (44, 46, 64-72), which during a processing process at least one process response variable resulting from the execution of the

Machining process results, at least indirectly can detect, characterized in that the

Control and / or regulating device (42) in such a way

is configured during the

Processing process the detected process response size is compared with a limit of the process response size (114) and depending on the result of the comparison, an action is triggered (118).

13. A workpiece processing system according to claim 12, characterized in that it further comprises a tool drive (60) which can set the tool (56) in rotation, and a feed drive, which a

Relative movement between the tool (56) and workpiece (12) can bring about, wherein the

Workpiece processing system for the execution of a

Method according to one of the preceding claims 1- 11 is formed.

14. Workpiece machining system according to claim 13, characterized in that it has at least one

Sensor device for detecting the process response variable includes.

15. Workpiece machining system according to one of claims 13 or 14, characterized in that a

Sensor device (46) for detecting a power of a feed drive and / or a sensor device (72) for detecting a power of a drive (60) of a tool (56) and / or a sensor device (70) for detecting a rotational speed of a tool (56) in Region of the respective drive (60) are arranged / is preferably integrated in this / is.

16. Workpiece machining system according to one of claims 13-15, characterized in that a

Sensor device (64) for detecting a temperature of the tool (56) and / or a sensor device (66) for detecting a deflection of the tool (56) are arranged on a tool holding portion (52) / works and works without contact / work.

17. workpiece machining system according to one of claims 13-16, characterized in that the control and / or regulating device (42) with a

parent production control system that specifies the process default sizes.

18. workpiece machining system according to one of claims 13-17, characterized in that in the control and / or regulating device (42) has a control circuit for controlling the feed rate of the tool (56) and / or for controlling the speed of the tool (56) in Response to at least one detected process response size is realized.