EP3790697A1

EP3790697A1 - Workpiece machining installation, and method for operating a workpiece machining installation and control device

Info

Publication number: EP3790697A1
Application number: EP19722017.1A
Authority: EP
Inventors: David Kretek; Silas Wari
Original assignee: Homag Plattenaufteiltechnik GmbH
Current assignee: Homag Plattenaufteiltechnik GmbH
Priority date: 2018-05-07
Filing date: 2019-04-24
Publication date: 2021-03-17
Also published as: CN112074368A; CN112074368B; WO2019214948A1; DE102018110942A1

Abstract

A workpiece machining installation (10) for machining workpieces (48, 51) comprises a tool for producing and/or machining an edge (50b, 61a) of a workpiece (48, 51). It is proposed that it comprise at least one sensor device (42), which outputs a signal on the basis of which a geometric property of a machined workpiece (48) can be determined.

Description

Title:

WORKPIECE MACHINING SYSTEM, AND METHOD FOR OPERATING A WORKPIECE MACHINING SYSTEM AND CONTROL DEVICE

description

The invention relates to a workpiece machining system, in particular a panel sizing saw, and a method for operating a workpiece machining system, and a control device according to the preambles of

sibling claims.

From the market known are workpiece machining systems in the form of panel sizing. With these can large-format rectangular plate-shaped workpieces

for example, for the purposes of the furniture industry in

smaller workpieces are split. For this purpose, the panel sizing saw has a feed table, a

Machine table, in the area of the actual

Sawing device is arranged, and a discharge table. Laterally of the said tables, a rectilinearly extending investment device is arranged in the form of an angle ruler, to which a - also as possible

rectilinearly extending - lateral edge of a

can be created to be split workpiece. This is intended to achieve a desired alignment of the workpiece relative to the sawing device.

EP 2 253 442 A1 describes a processing apparatus and a processing method for processing

plate-shaped workpieces. An Indian

Processing device existing workpiece can be measured by means of measuring devices. These can each measure the narrow side surfaces of the workpiece and are arranged for this purpose in the region of an alignment device. It is also known from DE 201 08 813 Ul known to align a workpiece to be sawn automatically on a sawing device spatially. Finally, EP 1 916 046 B1 describes a method for the automatic cutting of a plate-shaped workpiece, in the non-contact, namely optical, position and geometry and dimensions of the

be determined to be split workpiece. The object of the present invention is to provide a workpiece processing system, a method for its operation and a control device, which allows in a simple manner qualitatively

to obtain high quality machined workpieces.

This object is achieved by a

Workpiece machining system, a method for operating a workpiece machining system and a

Control device with the features of the respective independent claim solved. advantageous

Further developments of the invention are specified in subclaims. 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.

According to the invention, a workpiece processing system is proposed, with the particular plate-shaped

Workpieces can be processed for example for the production of furniture. For example, such a workpiece machining system is a panel sizing saw, with the large-sized output workpieces are divided into mostly rectangular machined workpieces. Such

Workpiece processing system includes a tool for

Making and / or Editing an Edge of a

Workpiece, such as a saw (mainly

Manufacture) or a milling cutter (both manufacturing and processing). It is suggested that the The workpiece machining system according to the invention comprises at least one sensor device which generates a signal

provides on the basis of which a geometric

Property of an immediately before the workpiece machining equipment machined workpiece can be determined, namely such a geometric property, which - possibly - by the immediately before

made processing of the edge of the workpiece has changed.

The invention also includes a method for operating such a workpiece machining system. According to the

Method, a signal is provided by means of at least one sensor device and based on this signal, a geometric property of a machined workpiece is determined, which in turn is such a geometric property, which is characterized by the

Machining the edge of the workpiece can change.

The invention makes it possible, after a successful

Machining a workpiece, for example, after a division of a starting workpiece so that a

separated and thus machined workpiece arises, this machined workpiece in terms of his

Geometry, especially in terms of length, width, straightness of an edge or multiple edges and squareness, to judge. It can thus be made immediately after the processing a statement as to whether the produced or machined workpiece meets a desired quality target or whether a post-processing is required or even a subsequent production of a new workpiece with the aim that this then meets the desired quality target.

Thus, the invention makes it possible to detect quality problems very quickly and very simply and to take appropriate countermeasures. As a result, the overall quality of the ultimately provided workpieces is improved.

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

Property comprises a curvature of an edge and / or an angle between two edges and / or a distance between two parallel edges of the machined workpiece. In particular, these geometric properties describe plate-shaped workpieces, and especially those that have been split up by machining, very well and are easy to detect.

It is also proposed that the sensor device

at least three stationary sensors, which are arranged along a preferably straight line (rigid), at least substantially orthogonal to a direction of movement of the machined plate-shaped

Workpiece extends, and that the signals of the sensors change a state when an edge of the workpiece moves past them. This is a very simple one

Embodiment of the invention provided

Sensor device. It is understood that the geometric property with greater accuracy and Reliability can be determined, the greater the number of sensors arranged along the line.

It is also proposed that the sensor device

includes at least three sensors along a

preferably arranged in a straight line and at least substantially orthogonal to the extension of the line are movable, and that the signals of the sensors change a state when they move past an edge of the workpiece. This is a possible design that

for example, even with existing ones

Workpiece machining systems can be retrofitted.

A further development provides that the

Sensor means comprises at least one sensor which is movable parallel to the extension of an edge of a machined workpiece. By such

Sensor device, the edge of the workpiece is quasi "scanned", whereby a very precise statement about the edge geometric property,

For example, a curvature is possible.

Furthermore, it can be provided that the sensor device comprises at least one sensor, which is at least partially integrated in a support table on which the machined workpiece is located. The movement of the

machined workpiece, of course, are not hindered, the at least one sensor must therefore be arranged below the support plane of the workpiece on the support table be. This is a very robust design of the

Inventively proposed sensor device.

It is also advantageous if the sensor device

comprises at least one sensor which is arranged at least partially adjacent to a processing area. The determination of the geometric property at the

machined workpiece can thus be done immediately after processing or even during the machining of the workpiece.

Suggested is stationary and linear

arranged sensors adjacent to

Processing region are arranged, that arranged along a line sensors in a conveying direction of

machined workpiece seen downstream of the

Processing area, that are arranged behind this. A return movement of the workpiece relative to

Processing area for detection by means of

Sensor device can thus be omitted, whereby time is saved.

In a further development, it is proposed that sensors arranged along a line in a conveying direction of the machined workpiece are also arranged upstream of the processing area, that is to say in front of it. In this way, even before seen in the direction of movement of the rear edge of the workpiece

Has crossed processing area, this already detected by means of the sensor device, whereby time is saved. In a further variant of the invention

Workpiece machining system is provided that the

Sensor means comprises at least one sensor which is arranged at least partially in the region of a buffer device. The detection by means of the sensor device can thus take place outside of the normal operation, whereby it is less disturbed.

It is advantageous if the buffer device is arranged laterally from a feed table. Such a buffer device is also known as an "active part buffer" and allows the introduction of a previously machined workpiece for re-processing.The arrangement of the sensor device in the region of such a buffer device, the quality control can be done immediately before said injection, which may not until the Buffering resulting changes in the geometric properties

can be considered.

Similar advantages arise when the

Buffer device is arranged above a processing area. However, such has one

Buffering still has the advantage of being very

is arranged to save space and thereby the

Overall dimensions of the workpiece machining system can remain small. It is also proposed that the sensor device

comprises at least one sensor which is arranged at least partially in the region of a lateral contact device, in particular in the region of an angle ruler. In addition, this allows the quality of a side edge of a workpiece to be checked, and also allows the workpiece to be correctly aligned by the workpiece

Check angle line when, for example, by the aforementioned linear arranged sensors, the front edge and / or the rear edge of the workpiece is detected. In this way the reliability of the quality statement is improved.

It is also conceivable that the sensor device comprises at least one sensor which is at least partially in the region of a pressure beam and thus in operation above the

Workpiece is arranged. Such a pressure bar is particularly in workpiece machining systems for

Processing of plate-shaped workpieces, such as panel sizing, used to during the

Machining operation to jam the workpiece between the pressure bar and a machine table. The pressure bar is thus vertically movable, and usually it extends longitudinally to the processing area, for example, longitudinally to and above a sawing gap. If the sensor device is arranged in the region of the pressure beam, for example integrated into it, it is practically compulsory in the region of the edge of the workpiece which is machined by the tool, and it can therefore be placed immediately after the tool

Editing the desired acquisition. In a Advantageous development for this purpose would also be conceivable that the sensor device comprises at least one sensor, for example, along a traverse parallel to the pressure bar above a processing area

is arranged, is movable.

Furthermore, the invention proposes that the

Sensor means comprises at least one sensor which is arranged at least partially in the region of a present above a processing area and movable portal. Again, this is a variant that provides a simple retrofit to existing ones

Workpiece machining systems enabled.

It is particularly advantageous if the sensor device is at least one optical sensor, for example an infrared sensor similar to those sensors, as are common in PC mice, and / or at least one inductive sensor and / or at least one touching sensor and / or at least one Camera includes. Even the very simple infrared sensors that are common in PC mice provide very good measurement results, as they reliably provide a signal state change when an edge of a machined workpiece moves past them (or they move past an edge of a machined workpiece) , All these sensors allow the

Capture quantities and provide appropriate signals, based on which very well the desired

geometric property of the machined workpiece can be determined. A development of the method according to the invention provides that in determining the geometric property of the machined workpiece, a relative speed between a sensor of the sensor device and the

Workpiece and / or a position of a program slider is taken into account. This is a very important one

Embodiment of the method according to the invention, as it allows in a very simple manner, a distance between two parallel and orthogonal to the

Determining movement direction extending edges of the workpiece. From the knowledge of the relative speed and the time that elapses between the detection of one edge by means of the sensor device and the detection of the other edge by means of the sensor device can be determined very precisely and simply the distance traveled in this time path and thus the said distance.

It is also advantageous, if dependent on the

determined action is triggered, this action is advantageously completely automatically, ie without the intervention of a person triggered. In this way, a largely or even completely automatic operation of the workpiece processing system can be achieved, whereby operating personnel can be saved, or it can be used operating personnel, which may be trained in less detail. As a result, costs can be saved in the operation of the workpiece machining system. In further development, it is proposed that the action is at least one of the following group:

• causing a handling of the workpiece: This can be done in response to a machining operation and include, for example, turning, moving and / or aligning the workpiece by means of a corresponding handling device, such as a robot or an alignment device, or manually by an operator, and / or a involve renewed or special machining of the workpiece.

The handling can also mean that, for example, due to a recognized impermissibly curved edge of the workpiece, a so-called "stress relief cut" is initiated

For example, in particle board during their

Production by cooling can cause internal stresses within the plate, which can cause the workpiece to distort during the division. By inserting a slot and separating out a strip in which the slot is located, a workpiece can be at least substantially freed from the internal stresses, so that in a subsequent division, the risk that crooked lateral edge portions arise is reduced. • Output of information to an operator: The information may include, for example, when the operator has detected an inappropriately curved edge or other deviation from a set quality target of the workpiece, a

Warning message and / or a specific instruction

is output, for example, acoustically in the form of a beep, in the form of a voice output, or visually by lighting a warning light or

Output of a text to a corresponding advertisement. It is also conceivable that the warning message and / or specific instruction is projected as an indication on the workpiece to be machined, or that a message on a mobile device, such as a smartphone or a tablet PC, is issued, or that one along the processing area arranged LED light strip in a given and the

Warning message and / or the concrete instruction

corresponding way lights up. But it is also possible that when the evaluation shows that the workpiece has reached the set quality target, this is also output as information to the operator.

Also, an exact indication of the extent of a curvature of the edge can be output to the operator as information, and corresponding ones can be provided

concrete instructions are issued to the operator, for example as text or as Language that makes it easier for her, an existing one

Problem or to avoid an imminent problem, for example, by the operator causes the above-mentioned stress relief.

The output of the information is directly at the

Workpiece processing possible, she can

Alternatively or additionally but also for example by Bluetooth or WLAN to a directly at the

Operator be issued existing display device, such as a worn by the operator smartwatch or to one of the

Operator carried headphones. In particular, in the case of a smartwatch, the output of the information can also be haptic, for example as

Vibration signal, done. Also, an output of the information by means of a laser assist system is possible with which, for example, a display is projected onto the workpiece, for example in the form of a handling instruction.

Saving a quality feature of the workpiece: This is particularly beneficial for logging the manufacturing process, which facilitates the handling of later complaints and allows optimization of subsequent processing. When

Quality feature, for example, an absolute value of a radius of curvature of the lateral edge is questionable, and / or a relative value of the radius of curvature, for example, relative to a threshold, or the like.

The quality feature can be directly in one

Memory of the workpiece machining system are stored, but it can also be stored in an external database, such as a cloud. In this way, the quality feature is available, for example, to a higher-level quality system, which provides the complete processing of the

Monitoring the workpiece and makes it possible to trace an error in the event of a complaint up to the processing step in which the error was generated.

In addition to the quality feature can also

at least one process parameter are stored, whereby correlations between process parameters and quality characteristics are made recognizable and traceable.

• Attaching information to the workpiece: This information may, for example, comprise a quality feature, as mentioned above, for example, a quality feature concerning the curvature of a lateral edge portion. Also, for example, the tolerances of the workpiece as well as the process parameters used to make the workpiece may be included in the information. The information can be applied, for example, by means of an adhesive label on the workpiece, and they can there for example, be easily readable in the form of a barcode or a QR code. This information is taken into account in the subsequent processing steps.

• cause the workpiece to be ejected:

This allows, for example, a post-treatment of a workpiece whose lateral edge as

was recognized impermissibly crooked so that this can later be used again for editing. This results in a high quality of processing

ensured, at the same time low

Material consumption.

• Declaring the workpiece as rejects: This is especially important if after-treatment does not promise success due to excessive exceeding of the permissible limit values. This is

For example, then the case when an impermissibly crooked lateral edge has been detected in an already machined workpiece, the sensor device has detected the distance so seen in the conveying direction after the processing area or determined. This also relieves the operator, since the action can be automated on the basis of the measurement result by the sensor device.

• cause a workpiece to be re-produced.

This is probably related to the above Bullet point "declaring the workpiece as scrap" may be of interest, which also considerably relieves the operator of the burden

Post-production can be carried out automatically. This can be automated to the extent that of a control device of

When a workpiece has been declared as scrap, the workpiece processing system automatically creates a new machining plan or an existing one

Machining plan is modified so that automatically proclaimed as rejected workpiece is reproduced without manual intervention by the

Operator, for example, a manual

Reprogramming or customizing the

Machining plan, is necessary.

• Create a geometric profile of an edge of the part or workpiece of a cutting plan. Such a geometric profile can in many ways

Be used, for example, when it comes to the cause of an undesirable curvature of a lateral edge of a workpiece

out. By analyzing the geometric deviation within the cutting plan can

Conclusions can be drawn on the setting of the machine and the resulting systematic errors. So it can be a systematic error and a machine-related cause to be determined, and it can be caused as a result of this a setting at the

Workpiece machining system is made

Overall, it is suggested by the above and

automatically initiated actions, the process reliability in the processing of particular plate-shaped

Workpieces significantly increased, and in particular in such a plate-shaped workpieces, in which a

Istabmessung deviates from a nominal dimension in an inadmissible manner. This is particularly advantageous in such workpiece machining systems that are operated largely automatically or even fully automatically. But even with hand-operated workpiece machining systems, the advantages mentioned above are noticeable. It is understood that a limit value, for example, defines that a workpiece, for example, a

has inadmissibly curved lateral edge, freely chosen by the operator or as a process parameter of a control device depending on the

workpiece to be produced automatically, ie without

Involvement by the operator, can be adjusted. The definition of the permissible tolerances can therefore be handled very flexibly and application-related.

According to the invention, it is further if it is concluded from the evaluation of at least one quality feature from the following group: deviation of an actual dimension of the workpiece from a nominal dimension; Angular error of the workpiece; Deviation of an actual course of the edge from a desired course. The invention also includes a control device for controlling a workpiece machining system of the above type, comprising a memory and a

Processor. It is suggested that the

Control device is set up to control the method described above.

The invention will be explained in more detail with reference to the accompanying drawings. Functionally equivalent elements and areas carry the same

Reference numerals. In the drawing show:

Figure 1 is a plan view of a first

Embodiment of a

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

Sensor device for determining a geometric property of a machined workpiece;

Figure 2 is a plan view of a workpiece and the

Sensor device of Figure 1 at different times during a

Feed movement of the workpiece;

Figure 3 is a diagram in which on the ordinate the

Times of signal state changes of five along the abscissa line

arranged sensors of the sensor device of Figure 2 at a right angle

Workpiece are shown;

4 shows a diagram in which a distance-corresponding signal of a lateral sensor of the sensor device of FIG. 2 is shown on the ordionate over the time t applied on the abscissa in a rectangular workpiece;

Figure 5 is a diagram similar to Figure 3 at a

trapezoidal workpiece;

Figure 6 is a diagram similar to Figure 4 at a

trapezoidal workpiece;

Figure 7 is a diagram similar to Figure 4 at a

Workpiece with material craters;

8 shows the diagram of Figure 7 after a

filtering;

Figure 9 is a plan view of two through the

Machining "banana-shaped" become

Workpieces, a processing line and the five linearly arranged sensors of the sensor device of Figure 2;

Figure 10 in the center: a plan view of two machined

Workpieces of a first operating situation, an upper and a lower line, each with three sensors of a sensor device and a processing line, above: a

Diagram similar to FIG. 3 for the upper line of sensors of the sensor device, and below: a diagram similar to FIG. 3 for the lower line of sensors of FIG

Sensor device;

FIG. 11 shows a representation similar to FIG. 10 of a second operating situation;

FIG. 12 shows a representation similar to FIG. 10 of a third operating situation;

FIG. 13 in the middle and bottom: a plan view of two machined workpieces of a first

Operating situation, a line with three

Sensors of a sensor device and a processing line, as well

above: a diagram similar to Figure 3 for the line of sensors;

FIG. 14 shows a representation similar to FIG. 13 of a second operating situation;

Figure 15 is a view similar to Figure 13 of a third operating situation; Figure 16 is a view similar to Figure 1 of a second embodiment of a

Workpiece processing system;

Figure 17 is a view similar to Figure 1 of a third embodiment of a

Workpiece processing system;

Figure 18 is a view similar to Figure 1 of a fourth embodiment of a

Workpiece processing system;

FIG. 19 is a view similar to FIG. 1 of a fifth embodiment of the invention

Workpiece processing system;

Figure 20 is a partially transparent top view of a pressure bar and a machine table of a sixth embodiment of a

Workpiece processing system;

Figure 21 is a schematic sectional side view of the arrangement of Figure 20; and

Figure 22 is a view similar to Figure 1 of a seventh embodiment of a

Workpiece processing system.

FIG. 1 shows a workpiece processing system 10 in the form of a panel sizing saw. It covers this case for example, a feed table 12, the present

is formed by way of example from a plurality of roller conveyors, one adjoining the feed table 12

Machine table 14 and an adjoining the machine table 14 discharge table 16. The latter is exemplified here as an air cushion table and consists in the present example of four segments, of which for reasons of simplicity, only one is provided with a reference numeral.

The machining of a workpiece takes place in the region of the machine table 14, in which there is a saw slot 18 for this, which runs along a sawing line 20, which is shown in dotted lines and forms a processing region. Below the Sägeschlitz 18 is a longitudinal to

Sawing line 20 movable saw carriage 22 present, the present example two saw blades (not shown) carries a main saw and a scoring saw. Above the saw line 20 is a dashed line

Pressure bar 24 is present, which can be lowered during processing of a workpiece on this.

In principle, but also quite different types of tools, such as milling equipment, drills, or the like.

To the workpiece machining system 10 further includes a conveyor in the present example in the form of a portal-like program pusher 26, which can be moved by motor in a conveying direction shown by an arrow 28 and back and a plurality of Collets 30 carries, of which in Figure 1 for reasons of clarity, only one with a reference numeral

is designated.

Furthermore, part of the workpiece processing system 10 is still a handling device 32, the present only

symbolically represented by a dot-dashed hexagon and, for example, may include a combination of a robot with a suction cross. By such a handling device 32, or - not

represented - a handling device of a

Disk storage, workpieces can be placed on the feed table 12 or removed from this, and it can workpieces are placed on the unloading table 16 and removed from this.

In the area of the discharge table 16 is also a

Labeling device 34 is present, and further in a lower portion of Figure 1 is still a display device 36 drawn. The workpiece machining system 10 also includes a side of the three support tables 12, 14 and

16 arranged investment device 38 in the form of a

in the present example, consisting of two segments 40a and 40b and extending in a straight line

strip-like angle line. The abutment 38 extends exactly orthogonal to the saw line 20. It can be seen from Figure 1, that the one segment 40a of

Facility 38 above all side feed table 12 and the second segment 40b of the abutment means 38 is arranged above all from the discharge table 16. The workpiece processing system 10 comprises a sensor device 42 which, in the present example, initially comprises six sensors 44a-f arranged in a straight line parallel to the saw line 20, which sensors are arranged in the

Machine table 14 are integrated flush with the surface. This straight line extends orthogonal to the

Feed direction 28 and thus also to a direction of movement 46 of a drawn in Figure 1 in the region of the machine table 14 and the unloading table 16 and shown in the present operating situation overall rectangular workpiece 48. Seen in the direction of movement 46 of the workpiece 48, this example has a

rectilinear front edge 50a and a rectilinear rear edge 50b. The workpiece 48 was separated by means of the saw carriage 22 and the saws present there by a section along the saw line 20 of a starting work 51, which is still held in Figure 1 by the collets 30 and located on the feed table 12

is drawn. In that regard, the workpiece 48 is a machined workpiece.

The sensors 44a-f are configured so that the

States of their signals change as the leading edge 50a and the trailing edge 50b move past, in the present case, past them. For this purpose, the sensors 44a to 44f are integrated into the machine table 14 on which the machined workpiece 48 lies, immediately adjacent to the saw line 20, which, as mentioned above, forms a processing area to that extent. In this case, the sensors 44a-f in the conveying direction 28 or the direction of movement 46 seen downstream of the

Processing area 20, that is arranged after this, ie a total of between the saw line 20 and the discharge table sixteenth

The sensors 44a-f are present

by way of example, infrared sensors similar to those used in PC mice, which are used here in the manner of a light barrier and which in the present case can also be referred to as "edge detection sensors" because of their function

Recognition of a border a relative movement between

Workpiece and sensor ahead. In principle, however, other sensors are possible, such as acoustic

Sensors, touching tactile sensors, inductive sensors or an image processing device in the form of a camera, wherein combinations of the above-mentioned sensors are possible. The sensors can be one

Cleaning device e.g. in the form of a blow-off nozzle

include, for example, removed with the resulting dust during operation and so the functionality of the sensors can be ensured.

A lateral edge of the workpiece 48, which is to the

The contact device 38 is also a sensor 54 is integrated, which is continuously a distance of the lateral edge 52 of the

Investment device 38 detected. To the workpiece machining system 10 also includes a control device 56, which may be, for example, a PC. The controller 56 receives signals from numerous sensors of

Workpiece processing system 10, as well as the sensors 44a-f and 54 of the sensor device 42. Depending on the signals of the sensors and depending on one or more computer programs that in the

Control device 56 are stored, the control device 56 controls various components of

Workpiece processing system 10 on.

The controlled components include, for example, the program pusher 26 and the collets 30, the saw carriage 22 and arranged on this saw, the

Handling device 32, the labeling device 34 and the display device 36. The controller 56 also communicates preferably bidirectionally with an external memory 58, which may be, for example, a cloud storage and are stored in the records of a database.

In a normal and optimal operation the works

Workpiece processing system 10 as follows: the

Starting work 51 is, for example, by means of

Handling device 32 placed on the support table 12. Then, the initial workpiece 51 is gripped at a rear edge by the collets 30 and stepwise in

Directed towards machine table 14. There it will be in one positioned desired relative to the saw line 20, then the pressure bar 24 is lowered, and then the workpiece 48 is separated from the starting work 51 by a cut (first cut), which then comes to rest on the machine table 14 and the discharge table 16. This process is repeated until the starting work 51 is completely divided.

Since the longitudinal extension of the abutment means 38 is exactly orthogonal to the longitudinal extent of the saw line 20, in this way rectangular separated and so far machined workpieces 48 are produced. These have in normal and optimal operation, which is drawn in Figure 1, exactly straight side edges 50a, 50b and 52, which are parallel or exactly orthogonal to each other.

After this first division of the starting workpiece 51, the machined workpiece 48 can either be stored temporarily or it can be stored immediately, or it can be immediately moved back onto the feed table 12, for example by the handling device 32, for example rotated there by 90 °, and then split again (second cut). The machined workpiece 48 thus becomes an initial workpiece from which then further machined workpieces arise. This process may possibly be repeated several times

(Third cut or aftercut).

In FIG. 2, the movement of the rectangular machined workpiece 48 in the direction of movement 46 is via the sensors 44a-f drawn with solid lines.

Moreover, in FIG. 2, the dashed line shows the movement of a trapezoidal workpiece 48 in FIG

Movement direction 46 over the sensors 44a-f away.

In FIG. 3, the times (ordinates) of FIG

State changes of the signals of the sensors 44a-f

(Abscissa) is plotted for the case of the rectangular workpiece 48. In this case, a time tl denotes those

Time at which the front edge 50a on the

Sensors 44a-f moved past, and the time t2 that time at which the rear edge 50b of the workpiece 48 moves past the sensors 44a-f or across this. In the diagrams is a target signal (corresponding to a perfectly rectangular and the sawing line 20 and the bearing device 38 aligned workpiece 48)

dashed lines drawn, and an actual signal is drawn through. In Figure 4, the signal corresponding to a distance (ordinate) of the sensor 54 is plotted over time.

It can be seen from Figure 3, that in the rectangular

Workpiece 48 all sensors indicate a change in the signal state at the desired times tl and t2. It can also be seen that knowing the speed of the workpiece 48 in the direction of movement 46 from the time difference t2-tl, the distance between the front edge 50a and the rear edge 50b can be determined. So it will be one

Relative speed between the sensors 44a-f of the sensor device 42 and the workpiece 48 or the relative distance traveled by the workpiece 48 relative to the sensors 44a-f taken into account. The determined distance represents a geometric characteristic of the processed plate-shaped workpiece 48, which in this way by means of

Sensor device 42 can be determined. It is thus possible by means of a measuring system of the program slider 26 by assigning the change of the signal states of

individual sensors 44a-f a distance between the

front edge 50a and the rear edge 50b to determine. From FIG. 4, it is further evident that an actual distance x between the lateral edge 52 and the abutment device 38 corresponds to the desired distance at any time during the movement of the workpiece 48 and thereby during the

Movement of the workpiece 48 remains constant. Again, as shown in Figures 3 and 4, the front edge 50a and the rear edge 50b are exactly parallel to each other, and the side edge 52 is exactly orthogonal to the two edges 50a and 50b. Thus, by the

Sensor device 42 also determines the angles between the edges 50 a, 50 b and 52, which are also geometric properties of the workpiece 48. Because the

Signal representations in Figures 3 and 4 beyond are also rectilinear, it is also known that the edges 50a, 50b and 52 are exactly straight, the curvature of which is therefore zero, which is also a geometric property of

machined workpiece 48 is.

All this is in the controller 56 from the

Signals of the sensors 44a-f and 54 and from the

also known in the control device 56

Speed of program slider 26 and that of the Program slider 26 determined path, and the actual values are compared in the controller 56 with the setpoints. In the present case, it can be seen that the actual values (as far as possible) exactly correspond to the desired values, from which the control device 56 concludes that the machined workpiece 48 is (to the greatest extent) exactly the same as the geometric feature

desired quality target. This is transmitted on the one hand to the memory 58, and on the other hand is on the workpiece 48 by means of the labeling 34 a

Label attached, which contains the deviations of the actual values of the set values (zero here) as quality features in the form of, for example, a barcode or a QR code.

It is understood that here and below

may possibly be required, the still grasped by the collets 30 of the program pusher 26

Retract workpiece 51 against the conveying direction 28 back to the feed table 12 back and then advance again in the conveying direction 28 in order to be able to bring about that the edge 61 a to be assessed on the

Sensors 44a-f moved past.

FIGS. 5 and 6 show the corresponding instants of the signal state changes or signal curves for the trapezoidal workpiece 48 shown in dashed lines in FIG. It can be seen that the times or

Signal curves clearly indicate the trapezoidal shape and indicate the deviations of the actual values from the nominal values. Out The evaluation in the control device 56 then shows that although the edges 50a and 50b of the workpiece 48 are parallel and rectilinear, the workpiece 48 is not rectangular but trapezoidal. These too

Quality features, ie the deviations of the actual values from the desired values, are stored in the memory 58 and by means of the labeling device 34 by a label, for example as a barcode or as a QR code on the

Workpiece 48 glued.

In the control device 56, the differences between the actual values and the setpoint values are compared with limit values, and if the limit values are exceeded, an action is triggered. It is therefore triggered depending on the determined geometric property (in this case: strong trapezoidal shape of the machined workpiece 48) said action. This action may include: causing a handling of the workpiece; Outputting information to an operator; Storing a quality feature of the workpiece (as mentioned above); Applying information to the workpiece (as also mentioned above); Cause the workpiece to be discharged; Declaring the workpiece as broke;

Cause a workpiece to be re-produced;

Create a Geometric Profile of an Edge of the

Workpiece; Error analysis of the machine setting and generating dependent instructions for the

Machine setting. In Figure 7, the signal of the sensor 54 of Figure 4 is reproduced more resolved. It can be seen that the signal has individual short peaks ("peaks"), which are designated 60 in FIG. These are caused by recesses ("material craters") in the lateral edge 52 of the workpiece 48. This is related to the fact that numerous materials (eg chipboard) too

Workpieces lead, which have in their interior not a perfectly closed structure but cavities. At an interface to the outside of these cavities are visible in the form of material craters.

Since the sensor 54 measures the distance of the lateral edge 52 from the abutment means 38 with a very high accuracy, for example, with an accuracy of a few hundredths of a millimeter, the said material craters in the form of the signal peaks 60 come to light. There is therefore a tolerance range (dashed lines in FIG. 7)

set, and signal values outside this

Tolerance range are filtered out. This then leads to the one ultimately used for the evaluation

Waveform corresponding to FIG. 8 or corresponding to FIG. 4.

FIG. 9 shows another operating situation with a

Starting work piece 51 and a machined workpiece 48. It can be seen that both workpieces 48 and 51 have warped due to existing internal stresses after the separation cut along the saw line 20, resulting in both sets a so-called "banana shape" Workpiece 48 can be seen that its rear edge 50 b is curved downwards in Figure 9, whereas a in

Movement direction 46 seen front edge 61 a of

Starting workpiece 51 is curved in Figure 9 upwards. This will open between these two

Workpieces 48 and 51, a crescent-shaped gap in the further movement of the two workpieces 48 and 51 in

Movement direction 46 of the lying below the gap 62 sensors 44a-c by a corresponding

Signal change is detected. Would the two have

Workpieces 48 and 51 are not warped, this gap 62 would not be present, and the underlying sensors 44a-c would generate no signal change in the movement of the two workpieces 48 and 51 on the sensors 44a-c over or over them. The sensors 44e and 44d located outside of the workpieces 48 and 51 do not detect any material in the case shown.

In the case shown in FIG

Signal state changes of the sensors 44a-c derived that the rear edge 50b of the workpiece 48 and the front edge 61a of the Ausgangswerkstücks 51 are not straight. As a result, by means of the sensors 44a-c

evaluated in accordance with the above description in connection with Figures 2-6 signals and compared the determined actual values with the predetermined setpoints. Depending on whether the values are inside or outside a tolerance range, this will

machined workpiece 48 declared either as "okay" or as "rejects". Again, of course, taking into account the relative speed and the distance traveled by the workpieces 48 and 51 relative to the sensor device 42 and the signal state changes of the sensors 44a-e, for example, the distance between the front and rear edges 50a, 50b and 61a and 61b determined become, so ultimately the workpiece width. These can also be compared with corresponding nominal values, so that automatically the dimensions of the machined

Work still during or immediately after the

Manufacturing process to be checked.

Reference is now made to FIGS. 10-12, in which the signal state changes of three sensors 44a-c arranged in a straight line and in the direction of movement 46 of the workpieces 48 and 51 immediately upstream of the saw line 20 and three in a straight line Line and in the direction of movement 46 of the workpieces 48 and 51 in the present example, immediately "downstream" of the saw line 20 arranged sensors 44d-f are explained. The sensors 44a-f are again such sensors as are known, for example, from conventional PC mice. They change their signal state the moment an edge of a workpiece moves past them. Here, too, the sensors 44a-f are integrated flush with the surface of the machine table 14 so that the signal state of the sensors 44a-f changes when an edge of a workpiece moves over them. Basically, these sensors work on the principle of a Light barrier. For reasons of illustration, the sensors 44a-f are drawn in a position that is greatly adjacent to the saw line 20. It goes without saying that she is also from the

Sawing line 20 could be located more distant.

All figures 10-12 show in the middle of the

Starting work 51 and the machined workpiece 48 after a sawing along the saw line 20, above the

Times of the signal state changes of

upstream row of sensors 44a-c and below the timing of the signal state changes of the downstream row of sensors 44d-f. For reasons of simplicity and clarity, the reference numerals are entered only for Figure 10.

FIG. 10 shows the case in which the material tensions are less than the holding forces of the collets 30 at the rear edge 61b of the starting workpiece 51. Despite the existing material stresses or because of the

Workpiece rigidity thus maintains the starting workpiece 51 in its rectangular shape and the leading edge 61a remains straight. Accordingly, the upstream sensors 44a-c change the signal state all at the same time and after a movement path exactly as intended

Movement path corresponds.

The machined workpiece 48, on the other hand, deforms banana-shaped as soon as it has been separated from the starting workpiece 51 because of the existing material stresses. When it moves from the starting work 51 further in the direction of movement 46 If its curved rear edge 50b passes over the downstream sensors 44d-f, these will not change the signal state at the same time. The outer sensors 44d and 44f change the signal state earlier than expected, that is, after a shorter movement path than

expected, whereas the middle sensor 44e the

Signal state substantially at the expected time and after the expected movement path changes. This is due to the fact that at this point the machined workpiece 48 rests directly on the starting workpiece 51, as would be the case even with a straight course of the rear edge 50b.

Analogously, the figures 11 and 12 explain

largely by itself: in Figure 11 and in Figure 12, the material stresses in the starting workpiece 51 are so high that this deformed banana-shaped, although its rear edge 61b is still gripped by the collets 30. Thus, during the movement of the front edge 61a of the output work 51 and the rear arise

Edge 50b of the machined workpiece 48 across the sensors 48a-f in the upper diagrams the timing of the changes of the signal states corresponding to the respective course of the leading edge 61a of the output workpiece 51. In the lower diagrams, the timing of the changes of the signal states corresponding to the respective Course of the rear edge 50b of the machined workpiece 48th FIGS. 13-15 show the same operating situations of FIGS. 10-12, but only one row of three sensors 44a-c is arranged downstream of the saw line 20 as viewed in the direction of movement 46. Because of

Simplicity and clarity are the

Reference number entered only for Figure 13, and the

Sesnors 44a-c are drawn strongly adjacent to the sawing line 20, but could in turn be clearly separated from it. The respective sensors 44a-c first change the signal state during the movement of the output workpiece 51 and the workpiece 48 pushed therethrough when the trailing edge 50b of the machined workpiece 48 passes over it, and again change the signal state when the leading edge 61a of the parent workpiece 51 moves over it. The results in the diagrams accordingly

drawn times of the changes in the signal states of the respective sensors 44a-c, from which the shape and also the dimension of the gap formed between the two workpieces 48 and 51 can be removed.

Referring now to Figs. 16-22, Figs

different embodiments of

Represent workpiece machining 10. there

the workpiece machining systems 10 differ in particular by the positioning and configuration of the sensor device 42

especially on this and the related

Features. Unlike the workpiece processing system 10 of FIG. 1, the workpiece processing system 10 of FIG. 16 additionally has a buffer device 64, which is arranged laterally from the feed table 12. The buffer device 64 has its own conveying device (not shown, for example a belt conveyor), with which workpieces 48a-d lying in the buffer device 64 can be moved, in particular in the direction of the feed table 12. This is symbolized by an arrow 66. Also one

Movement of lying in the buffer device 64

Workpieces 48a-d in the opposite direction

at least possible.

At the edge adjacent to the feed table 12

Buffer means 64 are presently arranged by way of example three arranged in a straight line stationary sensors 44a-c of the sensor device 42. Are the lying in the buffer device 64 (already, for example, by a first cut or a second cut

machined) workpieces 48a-d moved by the conveyor according to the arrow 66 in the direction of the feed table 12 towards and thereby into the feed table 12th

where they then, for example, from the

Collets 30 of the program pusher 26 gripped and the saw line 20 (for a second cut or a

Third section), the front and rear edges of these workpieces 48a-d pass over the sensors 44a-c, which in turn generates corresponding state changes of the signals of the sensors 44a-c, which, in particular in connection with FIG known speed of the conveyor in the direction of arrow 66 and the known path of movement in the direction of arrow 66, a statement about the straightness or

Curvature of said edges and the dimensions and the squareness of the workpieces 48a-d allowed. It is understood that the sensors 44a-c may be disposed both below the workpieces 48a-d and above the workpieces 48a-d.

The workpiece processing system 10 shown in FIG. 17 differs from that of FIG. 16 in that the sensors 44a-c arranged in a line are not stationary, but are essentially orthogonal to the extension of the line, corresponding to the arrows 68 drawn in FIG. The sensors 44a-c can

For example, be arranged on a common carriage which can be moved under the lying in the buffer device 64 workpieces 48a-d. This movement is carried out by motor, and for example by means of a position measuring system is at any time the position of the sensors 44a-c and during their movement

known distance traveled.

As the sensors 44a-c move past the workpieces 48a-d, the above-mentioned changes in the signal states of the sensors 44a-c again arise as they move under an edge of a workpiece 48a-d. From this change of the signal state and the known instantaneous position or the traveled path of the sensors 44a-c, the straightness, Curvature, squareness, dimension, etc., of the lying in the buffer device 64 workpieces 48a-d are determined.

In the workpiece processing system 10 of FIG. 18, the sensor device 42 is also present in the region of the buffer device 64 arranged laterally from the feed table 12. However, this has only one sensor 44, which is substantially parallel to the extension of the transverse edges of lying in the buffer device 64 workpieces 48 a-d

can be moved by motor (arrow 68). Preferably, the sensor 44 is located above the workpieces 48a-d in the buffering device 64. By means of the sensor 44, the entire to the feed table 12 directly

adjacent transverse edge (leading edge 50a) of one in the

Buffer means 64 lying workpiece 48a-d are scanned. Advantageously, in this case, the sensor 44 is not formed as a pure "edge detection sensor", for example in the form of the above-mentioned PC mice, but for example as a camera or as a laser scanner, the detection of the shape and position of an edge of a workpiece in a certain area or even the overall shape of a workpiece.

A further variant of a workpiece processing system 10 is shown in Figure 19, where the sensor device 42 is integrated into the abutment device 38. For this purpose, the abutment device 38 is subdivided into a plurality of individual segments, and the sensors 54a-c of FIG Sensor device 42 are used as distance sensors educated. This also allows the straightness or curvature of that edge of the workpiece 48, which to the

Investment device 38 points out determine (in the present case, the rear edge 50 b).

In FIGS. 20 and 21, only the machine table 14 and the elements present there are another

Embodiment of a workpiece machining system 10 drawn. In this workpiece processing system 10, the sensor device 42 is integrated in the pressure bar 24. It can be seen that the pressure bar 24 comprises two holding-down elements 70a and 70b, which are separate from one another and extend parallel to the saw line 20, one upstream and one downstream of the bar

Sawing line 20 and the saw slot 18 is arranged. Both hold-down elements 70a and 70b can be moved vertically, and so the output workpiece 51 before the division and the separated workpiece 48 and the remaining

Retain starting work piece 51 after splitting (this condition is shown in phantom in FIG. 21).

Between the two hold-down elements 70a and 70b there is a support 72, at the end of which machine table 14 points towards the end, by way of example several sensors 44a-d are arranged in the form of cameras (alternatively, the sensors could also be located on the hold-down element 70a

and / or attached to hold-down element 70b). These detect a lower region 74. The sensors 44a-d are preferably stationary. It is also conceivable that they are movable parallel to the saw line 20. This especially applies if, for example, only one

single sensor in the form of a camera or something similar would be provided.

By means of the sensors 44a-d, immediately after the

Dividing a generated kerf 76 between the two workpieces 48 and 51 are detected from above, so that both the position and the shape and even more

Qualitative properties of the rear edge 50b of the separated workpiece 48 and the front edge 61a of the starting workpiece 51 can be detected and evaluated. If necessary, in the region of the sensors 44a-d, a (not shown in the figure)

Lighting device may be provided which the

Detecting the kerf 76 by the sensors 44a-d facilitates or increases the accuracy.

In the drawn in Figure 22

Workpiece processing system 10, a buffer device 78 is arranged above the processing area 20, namely on a structure which the movable

Pressure bar (not visible in Figure 22, since of the

Buffer means 78 hidden) stores. Also there machined workpieces 48e-h can be stored before they further processing (for example, second cut and / or third cut) are supplied. In the

Workpiece processing system 10 of Figure 22 is the

Sensor device 42 arranged in the region of this buffer device 78, in the form of a movable portal 80, which is designed as a trade fair portal. This Messportal 80 can be moved across the buffer means 78 along the double arrow 68 and away at this

Movement lying in the buffer device 78

Scan workpieces 48e-h.

Such a gantry 80 has the advantage that not only a geometric property of a machined workpiece 48e-h can be determined with it, but also other quality features, such as those which the cut quality and the

Workpiece surface (scratches, outliers, etc.) concern. Such gantries are basically known from the market. For example, such a measurement portal 80 works with image acquisition or with a plurality of different sensors, for example cameras, ultrasound sensors, laser sensors, etc.

Such a measurement portal 80 can also in the field of

Buffer means 64 may be arranged, which is arranged laterally from the feed table 12, as indicated in Figure 22 by a dashed box. In this case, the measurement portal 80 may also be arranged stationary. Then the lying in the buffer means 64 would

Workpieces 48a-d are scanned from the measuring gantry 80 as they are moved by the conveyor of the buffering device 64 along the arrow 66 toward the feed table 12 below the gantry 80.

Claims

claims

1. workpiece processing system (10) for processing in particular plate-shaped workpieces (48, 51), in particular panel sizing, with a tool for producing and / or processing an edge (50b, 61a) of a workpiece (48, 51), characterized

characterized in that they have at least one

Sensor device (42) which provides a signal on the basis of a geometric property of a machined workpiece (48) can be determined.

2. workpiece machining system (10) according to claim 1,

characterized in that the geometric

Property comprises a curvature of an edge (50a, 50b) and / or an angle between two edges and / or a distance between two parallel edges (50a, 50b) of the machined workpiece (48).

3. workpiece machining system (10) according to at least one of the preceding claims, characterized in that the sensor device (42) comprises at least three stationary sensors (44) which are arranged along a preferably straight line, at least substantially orthogonal to a

Direction of movement (46) of the machined

plate-shaped workpiece (48) extends, and that the signals of the sensors (44) change a state, when an edge (50) of the workpiece moves past them.

4. workpiece machining system (10) according to at least one of the preceding claims, characterized in that the sensor device (42) at least three

Sensors (44) arranged along a preferably straight line and at least in

Are substantially orthogonal to the extent of the line movable, and that the signals of the sensors (44) change a state when they move past an edge (50a, 50b) of the workpiece (48).

5. workpiece machining system (10) according to at least one of the preceding claims, characterized in that the sensor device (42) at least one

Sensor (44) which is parallel to the extension of an edge (50 a, 50 b) of a machined workpiece (48) movable.

6. workpiece machining system (10) according to at least one of the preceding claims, characterized in that the sensor device (42) at least one

Sensor (42) which is at least partially in a support table (14) on which the machined workpiece (48) is at least partially integrated.

7. workpiece machining system (10) according to at least one of the preceding claims, characterized in that the sensor device (42) at least one

Sensor (44, 54), which at least partially to a processing area (20) is arranged adjacent.

8. workpiece machining system (10) after a

Combination of claims 3 and 7, characterized

in that sensors (44) arranged along a line are arranged in a conveying direction (46) of the

machined workpiece (48) seen downstream of the processing area (20) are arranged.

9. workpiece processing system (10) according to claim 8,

characterized in that along a line

arranged sensors (44) in a conveying direction (46) of the machined workpiece (48) also seen

upstream of the processing area (20)

are arranged.

10. workpiece machining system (10) according to at least one of the preceding claims, characterized in that the sensor device (42) at least one

Sensor (44), at least partially in

Area of a buffer device (46, 78) is arranged.

11. workpiece machining system (10) according to claim 10, characterized in that the buffer device (46) is arranged laterally from a feed table (14).

12. workpiece machining system (10) according to claim 10, characterized in that the buffer device (78) is arranged above a processing area (20).

13. workpiece machining system (10) according to at least one of the preceding claims, characterized in that the sensor device (42) at least one

Sensor (54), which at least partially in

Area of a lateral contact device (38), in particular in the range of an angle ruler is arranged.

14. workpiece machining system (10) according to at least one of the preceding claims, characterized in that the sensor device (42) at least one

Sensor (44), at least partially in

Area of a pressure bar (24) is arranged.

15. workpiece machining system (10) according to at least one of the preceding claims, characterized in that the sensor device (42) at least one

Sensor comprises, which is arranged at least partially in the region of a above a processing area (20) existing and movable portal (80).

16. workpiece machining system (10) according to at least one of the preceding claims, characterized in that the sensor device (42) at least one optical sensor (44) and / or at least one inductive sensor and / or an acoustic sensor and / or at least one touching sensor and / or at least one camera (44).

17. Method of operating a

Workpiece processing system (10) according to any one of the preceding claims, characterized in that by means of at least one sensor device (42) provided a signal and on the basis of this signal a geometric property of a machined

Workpiece (48) is determined.

18. The method according to claim 17, characterized in that in determining the geometric property of the machined workpiece (48) a

Relative speed between a sensor (44, 54) of the sensor device (42) and the workpiece (48) and / or a position of a program pusher (26) is taken into account.

19. The method according to at least one of claims 17-18, characterized in that depending on the

determined geometric property an action is triggered.

20. The method according to claim 19, characterized in that the action is at least one of the following group: causing a handling of the

machined workpiece (48); Issue of a

Information to an operator; Storing a quality feature of the machined workpiece (48); Attaching information to the edited Workpiece (48); Causing the machined workpiece (48) to be discharged; Declaring the machined workpiece (48) as scrap;

Cause a workpiece to be re-produced; Create a Geometric Profile of an Edge of the

Workpiece (48, 51); Identifying a systematic error and a machine-related cause thereof; Cause a hiring at the

Workpiece machining system is made. 21. Method according to claim 17, characterized in that the conclusion is drawn from the evaluation of at least one quality characteristic from the following group: deviation of an actual dimension of the workpiece from a nominal dimension; Angular error of the

Workpiece; Deviation of an actual course of the edge from a desired course.

22. Control device (56) for controlling a

Workpiece machining system according to one of claims 1 to 16, comprising a memory and a processor, characterized in that the control device

(56) is arranged to control the method according to any one of claims 17-21.