Method for operating a workpiece machining system and workpiece machining system

Abstract

A workpiece machining system with at least one machine tool, which has at least one loading and unloading opening and at least one safety area, which has at least one loading and unloading device, which has at least one carrier and at least one loading and unloading device which can be moved along the carrier and, in particular, one that is multi-axis, where the loading and unloading device can be arranged in front of at least one of the at least one machine tool in a loading and unloading position and at least one gripping arm of the loading and unloading device can be moved from a displacement position, in which the gripping arm is arranged substantially above the carrier, into an engagement position, and with at least one safety device for monitoring the Security area of the at least one machine tool.

Claims

1. A method for operating a workpiece machining system, which comprises at least one machine tool, which has at least one loading and unloading opening and at least one safety area, which has at least one loading and unloading device, which has at least one carrier and at least one loading and unloading device which can be moved along the carrier and, in particular, one that is multi-axis, wherein the loading and unloading device can be arranged in front of the at least one machine tool in a loading and unloading position and at least one gripping arm of the loading and unloading device can be moved from a displacement position, in which the gripping arm is arranged substantially above the carrier, into an engagement position, in which the gripping arm protrudes laterally beyond the carrier and in particular is arranged in or above the loading and unloading opening of the machine tool, and includes the at least one safety device for monitoring the safety area of the at least one machine tool which has at least one control unit functionally assigned or attributable to the loading and unloading device and at least one first sensor means, arranged in or on the safety area, comprising the steps: a. if necessary, depositing and/or defining of at least of one safety-relevant event in the control unit; b. monitoring at least one safety area of at least one machine tool by the at least one first sensor means of the safety device; c. if necessary, detecting of the position of the loading and unloading device, in particular directly or indirectly, by the control unit; d. detecting of an at least one safety-relevant event in the safety area of the machine tool, defined, stored or deposited in the control unit, by the at least one first sensor means; e. blocking a transfer of a gripping arm of the loading and unloading device from the movement position in the engaged position when the gripping arm is in the movement position and/or transferring the gripping arm of the loading and unloading device from the engagement position in the movement position when the gripping arm is in the engaged position.

2. The method according to claim 1, wherein at least one security-related event defined, definable, deposited or depositable in the control unit, comprises at least one open functional position of an operator access of the machine tool, a transferring of the operator access from a closed functional position in the open functional position and/ or penetration of a body into the safety area of the machine tool.

3. The method according to claim 1, wherein the monitoring of the safety area of the machine tool by the at least one first sensor means of the safety device comprises detecting a closed functional position or open functional position of the operator access of the machine tool and/or detecting an approach of a body to the machine tool, in particular towards the safety area of the machine tool.

4. The method according to claim 3, further comprising the steps: a. if necessary, depositing and/or defining data, in particular body shapes and/or body contours, in the control unit for distinguishing between objects and persons by the control unit; b. detecting an approach of a body to a machine tool, in particular into the safety area of the machine tool, by the at least one first sensor means; c. analysing of the body by the control unit and detecting and recognizing the sensed body as an object or as a person; d. determining a security-relevant event at least if the body comprises a person.

5. The method according to claim 1, wherein detecting the position of the loading and unloading device occurs through at least a second sensor means of the safety device by which at least a distance is detectable from the loading and unloading device to the tool machine, where the safety-relevant event is ascertained.

6. The method according to claim 1, with the step that the loading and unloading device, while detecting the at least one safety-relevant event, comprises a moving of the loading and unloading device from the loading and unloading position before the machine tool at which the safety-relevant event is detected.

7. The method according to claim 6, wherein: a. interruption of machining processes deposited or depositable in the control unit of the loading and unloading device on the machine tool on which the safety-relevant event is detected; b. ascertaining whether an at least one machining process deposited or depositable in the control unit of the loading and unloading device on a machine tool in which no safety-relevant event is ascertained, can be continued; c. moving the loading and unloading device to a machine tool in which no safety-relevant event is ascertained, and on which a machining process deposited or depositable on the control unit can be executed; or d. moving the loading and unloading device to a park position, if a safety-relevant event is ascertained on every machine tool, and/or on which no machining process deposited or depositable on the control unit can be executed; e. checking continuously whether the safety-related event detected on the machine tool has ended and whether the interrupted machining process can be continued.

8. A workpiece machining system, that is operable in particular by a method according to claim 1 with at least one machine tool, which has at least one loading and unloading opening and at least one safety area, which has at least one loading and unloading device, which has at least one carrier and at least one loading and unloading device which can be moved along the carrier and, in particular, one that is multi-axis, wherein the loading and unloading device can be arranged in front of at least one of the at least one machine tool in a loading and unloading position and at least one gripping arm of the loading and unloading device can be moved from a displacement position, in which the gripping arm is arranged substantially above the carrier, into an engagement position, in which the gripping arm protrudes laterally beyond the carrier and in particular is arranged in or above the loading and unloading opening of the machine tool, and with at least one safety device for monitoring the safety area of the at least one machine tool which has at least one control unit functionally assigned or attributable to the loading and unloading device and at least one first sensor means, arranged in or on the safety area.

9. The workpiece machining system according to claim 8, wherein the at least one first sensor means of the safety device comprises at least one motion sensor, rangefinder or toggle switch of an operator access of the machine tool.

10. The workpiece machining system according to claim 8, wherein the safety device comprises at least a second sensor means by which a distance of the loading and unloading device to the machine tool can be detected and which comprises a rangefinder and/or a motor position of a drive of the loading and unloading device.

11. The workpiece machining system according to claim 9, wherein the safety device comprises at least a second sensor means by which a distance of the loading and unloading device to the machine tool can be detected and which comprises a rangefinder and/or a motor position of a drive of the loading and unloading device.

12. The method according to claim 2, wherein the monitoring of the safety area of the machine tool by the at least one first sensor means of the safety device comprises detecting a closed functional position or open functional position of the operator access of the machine tool and/or detecting an approach of a body to the machine tool, in particular towards the safety area of the machine tool.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The drawing shows:

[0048] FIG. 1 A perspective side view of a workpiece machining system with a loading and unloading device in an engaged position of a gripping arm;

[0049] FIG. 2 A perspective preview of the workpiece machining system according to FIG. 1 while detecting a safety-relevant event;

[0050] FIG. 3 A schematic flow diagram of a first embodiment example of the method;

[0051] FIG. 4 A schematic flow diagram of a supplement of the method according to FIG. 3;

[0052] FIG. 5 A schematic flow diagram of an embodiment of supplementary method steps for the method according to FIG. 3.

DETAILED DESCRIPTION OF THE INVENTION

[0053] FIGS. 1 and 2 show a workpiece machining system provided overall with the reference numeral 2. This comprises at least one machine tool 4, which comprises at least one loading and unloading opening 6 and a security area 8.

[0054] In addition, the workpiece machining system 2 comprises a loading and unloading device 10, which has a carrier 12 and a multi-axis loading and unloading device 14 embodied as a robot. With the embodiment shown in FIGS. 1 and 2, the Loading and unloading device is spaced from a floor and the carriers 12 arranged on supports 16. By the arrangement of the carrier 12 on the supports, 16 an operator's access 18 of the machine tool 4 is accessible to a person 20.

[0055] In addition, the machine tool 4 comprises a first sensor means 22 with which the safety area 8 is monitorable. The first sensor means 22 is part of a safety device 24 which comprises in addition to the first sensor means 22 a control unit 26 with which the data of the first sensor means 22 are detectable and evaluateable and the loading and unloading device 10 is selectable.

[0056] FIG. 1 shows the workpiece machining system 2 for which no safety-relevant event is ascertained. The loading and unloading device 14 is in a loading and unloading position before the machine tool 4 and intervenes in the machine tool 4 with a gripping arm 28 through the loading and unloading opening 6 of the machine tool 4. With the gripping arm 28, for example, work pieces, tools or such can be added or removed in the interior of the machine tool 4.

[0057] FIG. 2 shows the workpiece machining system 2 for which a safety-relevant event was ascertained. The safety-relevant event according to FIG. 2 concerns the penetration of a person 20 into the safety area 8 of the machine tool 4.

[0058] The loading and unloading device 14 is still in the loading and unloading position before the machine tool 4. However, the gripping arm 28 was automatically transferred, by the safety device 24, in particular the control unit 26, from an engagement position, in which the gripping arm 28 protrudes laterally beyond the carrier 12 and in particular is immersed in the loading and unloading opening 6 of the machine tool 4, to a movement position in which the gripping arm 28 is arranged essentially above the carrier 12 of the loading and unloading device 10.

[0059] With the help of the FIGS. 3 to 4, a method for operating a workpiece machining system 2 will be explained below.

[0060] In the first step 101, a safety-relevant event is deposited or is defined if necessary in the control unit 26. On this occasion, the safety-relevant event can concern an opened functional position of the operator's access 18, transferring the operator's access 18 from a closed functional position to an opened functional position and/or a penetration of a body 20 into the safety area 8 of the machine tool 4.

[0061] In a step 102, the safety area 8 is monitored by the first sensor means 22 of the safety device 24.

[0062] In a possible further step 103, the position the loading and unloading device 14 is detected by the control unit 26. This can occur, for example, through the second sensor means 30 of the safety device 24.

[0063] In a subsequent step 104, a safety-relevant event defined, deposited or depositable in the control unit 26 in the safety area 8 of the machine tool 4 is detected by the first sensor means 22. Transferring the gripping arm 28 of the loading and unloading device 14 from the movement position according to FIG. 2 in the engagement position according to FIG. 1 is blocked by detecting the safety-relevant event, and/or a gripping arm 28 which is in the engagement position according to FIG. 1 is transferred from the engagement position in the movement position by the control unit 26.

[0064] Monitoring the safety area 8 of the machine tool 4 occurs through the first sensor means 22. This can concern, for example, an opened functional position of the operator's access 18, transferring the operator's access 18 from a closed functional position to an opened functional position and/or and/or an approximation of a body 20 to the machine tool 4, in particular in the security area 8 of the machine tool 4.

[0065] FIG. 4 shows a development of the method according to FIG. 3 and dissects the method step 104 according to FIG. 3 into several intermediate steps.

[0066] In a possibly envisaged step 100 which is concurrent or upstream to or of the step 101, a date or several dates is or are deposited or defined in the control unit 26 which serves, for example, the differentiation of objects and people 20 by the control unit 26 and comprises in particular body forms and/or body contours.

[0067] After the step 103 according to FIG. 3, approximating of a body 20 to the machine tool 4, in particular in the safety area 8 of the machine tool 4, is detected in a step 104a by the first sensor means 22. In a directly following step 104b, the body 20 is analysed by the control unit 26 and the differentiation of the body is ascertained and is recognised as an object or as a person 20.

[0068] If it is determined in step 104b that the body 20 concerns an object, no safety-relevant event is present. Then the method jumps back to step 100. However, if it is determined that the body concerns a person 20, it is determined in a step 104c that it concerns a safety-relevant event and this event is established. The method continues in such a case with step 105.

[0069] FIG. 5 shows an embodiment of the method according to FIG. 3 with which further method steps connect afterwards to step 105. In a step 106, machining processes of the loading and unloading device 14 deposited in the control unit 26 are interrupted on the machine tool 4 on which the safety-relevant event is detected.

[0070] In a subsequent step 107, it is determined whether a machining process deposited in the control unit 26 of the loading and unloading device 14 can be continued on a machine tool 4 on which no safety-relevant event is ascertained. If a machine tool 4 is detected by the control unit 26 on which no safety-relevant event is ascertained and on which a machining process deposited in the control unit 26 can be executed, the loading and unloading device 14 is moved to this machine tool 4 in a step 108a.

[0071] If no machine tool 4 is determined, however, on which no safety-relevant event is ascertained and/or on which no machining process deposited in the control unit can be executed, the loading and unloading device 14 is moved into a parking position in a step 108b.

[0072] In step 108a, the loading and unloading device 14 continues a processing operation associated with the machine tool 4 as soon as it has reached the loading and unloading position there.

[0073] In a subsequent step 109, which follows both steps 108a and 108b, it is checked continuously whether the safety-relevant event ascertained on the machine tool 4 is finished and whether the interrupted machining process can be continued.

[0074] If there is still the safety-relevant event on the machine tool 4 at which the safety-relevant event was detected, the method jumps back to step 107 and detects once more whether a machining process of the loading and unloading device 14 deposited in the control unit 26 can be continued on a machine tool 4 on which no safety-relevant event is ascertained. However, if it is determined in step 109 that the safety-relevant event does not exist on the machine tool 4 anymore, the method returns to step 100.

[0075] The features of the invention disclosed in the foregoing description, in the claims and in the diagrams, may be essential both individually and in any combination in the implementation of the invention in its various embodiments.

REFERENCE LIST

[0076] 2 workpiece machining system

[0077] 4 Machine tool

[0078] 6 Loading and unloading opening

[0079] 8 security area

[0080] 10 Loading and unloading equipment

[0081] 12 Carrier

[0082] 14 Loading and unloading device

[0083] 16 supports

[0084] 18 Operator Access

[0085] 20 Body, person

[0086] 22 First sensor tool

[0087] 24 Safety device

[0088] 26 control unit

[0089] 28 gripper arm

[0090] 30 Second sensor tool

[0091] 100-109 method steps