WO2006103249A2 - Verfahren und steuereinrichtung zur gezielten reaktion bei einem kontakt zwischen einem maschinenelement einer maschine mit einem gegenstand - Google Patents
Verfahren und steuereinrichtung zur gezielten reaktion bei einem kontakt zwischen einem maschinenelement einer maschine mit einem gegenstand Download PDFInfo
- Publication number
- WO2006103249A2 WO2006103249A2 PCT/EP2006/061122 EP2006061122W WO2006103249A2 WO 2006103249 A2 WO2006103249 A2 WO 2006103249A2 EP 2006061122 W EP2006061122 W EP 2006061122W WO 2006103249 A2 WO2006103249 A2 WO 2006103249A2
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- WO
- WIPO (PCT)
- Prior art keywords
- machine
- contact
- detected
- collision
- machine axis
- Prior art date
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/406—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by monitoring or safety
- G05B19/4061—Avoiding collision or forbidden zones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles
- B23Q5/58—Safety devices
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/49—Nc machine tool, till multiple
- G05B2219/49142—Shut off power, stop if outside working zone
Definitions
- the invention relates to a method for the targeted reaction at a contact between a machine element of a machine Ma ⁇ with an object.
- the invention relates to a control device with a program memory in which a computer program is deposited containing code sections with which the above-mentioned method can be executed when the computer program is called by the control device.
- One potential process failure is a collision of a machine element, e.g. may be in the form of a tool or a spindle and an article of e.g. in the form of a workpiece, a tool slide or a clamping device. Compared to other process disturbances collisions lead to the highest repair costs and the longest downtime.
- Sys ⁇ tems and strategies To avoid costs for maintenance and downtime, or at least reduce, have been different Sys ⁇ tems and strategies.
- Commercially available mecha nically ⁇ acting devices or systems with sensors have the disadvantage that they only after entry of the contact and an additional delay to the force build-up in the mechanical structure are effective so that only a reduction of the damage is possible.
- Passive mechanical Sys ⁇ systems such as overload couplings are based on the principle that in the case of high feed forces by, for example slip or snap-in couplings the forces occurring are limited. However, the consequences of a collision can only be limited during fast traversing movements.
- the disadvantage here is that it usually due to the late reaction to significant damage, especially loss of manufacturing accuracy comes because only at a significant overload of the components is reacted, ie when the force is already high and usually causes damage. Furthermore, the balancing of spindle and tool must be controlled even at very low speeds after a collision and in extreme cases, the machine can be re-measured, which means high cost.
- Collisions are detected in advance and prevented. Collisions due to the failure of control components can be excluded by so-called safety functions in the numerical control of the machine.
- the numerical control can monitor protection zones, eg around clamping jaws and tailstock or limit contours.
- the commercially available solutions are often limited, for example, is often only the tip of acti ⁇ ven tool monitored and it can only simple geometries are defined as protected areas.
- Another disadvantage is that the workpiece is usually not considered.
- collisions can be detected, for example, between a workpiece or a tool.
- the simulation works with adopted tool and workpiece dimensions, so that the loading of a false workpiece (wrong judgment, not sprues removed) and fal ⁇ rule tools, can not be detected. Errors when setting up a program can not be recognized who ⁇ .
- the invention has for its object to minimize the impact of a collision between a machine element of a machine with an object.
- This object is achieved by a method for specific reaction in the case of contact between a machine element of a machine and an object,
- control device having a program memory in which a computer program is stored, which contains code sections with which, when the computer program is called up by the control device, the aforementioned method can be executed.
- a Kollisi ⁇ onserkennung is performed by a feed per edge is compared with a feed per edge limit, which is detected when exceeding the feed per edge limit to a collision. This allows a simple collision detection.
- a collision ⁇ detection is performed by an increase of a cut ⁇ force is compared with a mean increase in force limit, said limit value is detected on exceeding the Thomaskraftsanctions- a collision. This allows a particularly simple detection of a collision.
- the further Ver ⁇ drive the machine is stopped so by first checks whether a timely stop by an adapted speed reduction of the machine axis is possible, and if this is possible, the machine axis stopped by an adapted speed reduction If this is not possible, the drive of the machine axis is stopped immediately. As a result, a stop reaction adapted to the respective situation is made possible.
- the Maschi ⁇ nenelement from the object are electrically insulated disposed and element an electric voltage between the Maschinenele ⁇ and the object is applied, wherein the contact be- see the machine element and the object is detected by a Upon detection, resulting detection current is detected.
- a simple and si ⁇ chere contact detection is possible.
- a collision is detected if, after the detection of the contact, the detection current over a defined period of time beyond a detection current limit continuously. This allows a simple and reliable detection of a collision.
- the contact between the machine element and the object is detected by in the case of seeing the change in the traversing speed of the machine axis to a contact ⁇ it is known.
- a safe and reli ⁇ transparent recognition of a contact is possible.
- the Maschi ⁇ nenelement is designed as a tool or as a spindle. Ei ⁇ ne training of the machine element as a tool or spindle represent usual training of the machine element.
- the object is designed as a workpiece, tool slide or as a clamping device.
- a design of the object as a workpiece, tool slide or as a clamping device represent conventional embodiments of such an item.
- the drive of the machine axis is stopped immediately by first checking whether a sufficient damage reduction can be achieved by braking with the drive, where ⁇ if possible, the machine axis by the on ⁇ drove is stopped, and if this is not possible to ⁇ additional brakes are used to stop and / or the power flow is opened.
- This measure enables an optimized stopping of the machine axis.
- the machine is designed as a machine tool, production machine and / or as a robot.
- An embodiment of the machine as a horrma- machine, a production machine and / or as robots have üb ⁇ Liche embodiments of the machine wherein, however, understood that the invention is also suitable for other machines.
- FIG. 1 shows a machine tool
- FIG. 2 shows a flow chart of the method according to the invention
- FIG. 3 shows a method for collision detection by means of a
- Evaluation of the feed per cutting edge shows a method for collision detection by means of a
- FIG. 6 shows a method for detecting a contact between a machine element and an object
- FIG. 7 shows a further method for detecting a contact between a machine element and an object
- FIG. 8 shows a method for detecting a collision by means of
- FIG. 9 shows a method for collision detection by means of evaluation of a detection current.
- a machine tool is shown in the form of an embodiment in schemati ⁇ sated form.
- the tool ⁇ machine has a machine bed 2, a tool carriage 7 and a drive 4, which drives a tool 6 via a spindle 8.
- the machine includes a Steuerein ⁇ direction 14 (eg, a numerical control) for controlling the machine.
- the control device 14 controls the machine via a connection 16.
- the machine shown by way of example has two machine axes.
- the tool can ⁇ slide 7 in the direction of the double arrow 3 (horizontal Ma ⁇ schin axis) in the horizontal direction by means of a drive 43 of the horizontal machine axis to be moved and Actuator 4 for rotationally driving the spindle with the spindle 8 and the tool 6 41 (vertical machine axis) of the vertical machine axis in the vertical direction, in the direction of the double arrow with ⁇ means of a drive 44 are procedural ren.
- the actuators 43 and 44 have for this purpose, for the generation of the corresponding ⁇ linear movements, drive shafts 45 and 46 to supply.
- a workpiece 5 Arranged on the tool slide 7 is a workpiece 5 to be machined by means of the tool 6, the workpiece 5 being arranged in an electrically insulated manner by means of an insulator 1 from the tool slide 7. An isolation can be carried out at other locations. Alternatively, it is also conceivable, for example, to electrically isolate the tool carriage or the spindle. The workpiece 5 can be moved in the horizontal direction by means of the tool carriage 7. It should be noted at this point that under the
- the tool 6 is considered as a machine element of Maschi ⁇ ne.
- the work is compelling ⁇ 6 in the form of a milling cutter formed.
- the two machine axes and thus the workpiece 5 and the tool 6 are moved accordingly by the control device 14. This can lead to unexpected, ie unwanted collisions between machine elements such as, for example, the tool 6 or the spindle 8 and objects such as the workpiece 5 or the tool slide 6, come.
- the workpiece 5 is arranged insulated from the tool carriage 7 by means of an insulator 1.
- a voltage U between the workpiece 5 and the tool 6, the electrically conductive connectedness with the spindle 4 to is created.
- the traverse speed of the ma- involved are calculated schin axes in which with the aid of existing in the machine anyway measurement systems and in case of a unerwarte ⁇ change of the travel speed of a machine axis a contact is detected.
- Such an unexpected change in the travel speed can be set very sensitively, so that likewise no large forces are necessary to make them respond. This is possible in particular because disturbing signal influences such as accelerations can be suppressed by appropriate setpoint specifications.
- FIG 2 the flow of he ⁇ inventive method is shown in the form of a flow chart.
- a contact is first queried in a decision block 25 determines whether a machine axis during the contact means of the control ⁇ device 14 just automated, that is controlled by the control device 14 and is not moved by manual operation. If this is the case, then in a further decision block 26 it is queried whether the machine is just in a fast travel mode.
- a machine axis during the contact means of the control ⁇ device 14 just automated, that is controlled by the control device 14 and is not moved by manual operation. If this is the case, then in a further decision block 26 it is queried whether the machine is just in a fast travel mode.
- Commercially available Ma ⁇ machines have essentially two basic Verfahrmo- used, namely a slow and a fast traversing mode traversing mode. In the fast travel mode, the corresponding machine axis is moved quickly, for example, to move the tool from a basic position into the machine
- Such a fast travel mode is also referred to commercially as a so-called rapid traverse.
- the slow travel mode is understood to be a slow movement of the machine axis.
- the method with a feed which is used during eigentli ⁇ chen machining operation (eg during the milling process), and has only a low traversing speed understood.
- a module 29 for monitoring the feed per cutting in which the feed per tooth of the tool is compared with a predetermined feed rate per cutting edge ⁇ limit value, wherein the feed is detected on a collision per cutting edge limit is exceeded.
- FIG. 3 the functional diagram corresponding thereto is shown. If the current value of feed per edge Vp 3 below the predefined threshold V Feed per cutting PSG ⁇ , produces a limit monitor 9 at its output a corresponding signal indicative of a collision.
- a collision detection is performed, in which an increase F 3 A of the cutting force F 3 is compared with a Thomaskraftanumble- limit F SG , which is detected when exceeding the Thomaskraftantraingrenzwert F SG on a collision.
- the cutting force determined by the control device 14, for example from the drive current of the machine axis, is determined F 3 shown in FIG 4 added to a differentiator 10 and such measure ⁇ the increase in cutting force F SA is determined, by means of a limit value monitor 11, the ThomaskraftanTA F SA with the ThomaskraftanTENsgrenzwert F SAG is compared and is exceeded when exceeding the ThomaskraftanTENsgrenzwerts F SAG detected on a collision, by the threshold detector 11 when Ü exceeding the ThomaskraftanTENsgrenzwerts F SAG generates a ent ⁇ speaking output signal.
- ⁇ means of an additional not shown switch-on gers, which is switched behind the limit indicator 11 can be achieved, that is only detected consecutive exceeding of the cutting force increase threshold for a predetermined time T 3 out at a collision.
- the drive current I A for driving the machine axis is first high-pass filtered by a high pass filter 20 and then compared in a limit detector 21 with a drive current limit I AG , where if the limit over a predetermined period of time Ti, which is realized by means of a Einschaltverzögers 23, the drive ⁇ current limit IAG is continuously exceeds recognized on a Kol ⁇ lision.
- the force F M acting on the machine element or a variable derived from the drive current I A can also be evaluated analogously, in accordance with the function diagram for collision detection described in FIG. 8, by comparison with a corresponding limit value.
- a collision detection by means of a monitoring of the Detesti- onsstromes I n done. If, after the detection of the contact, the detection current I D continuously exceeds a detection current limit I DG for a defined period of time T 2 , a collision is also detected.
- FIG. 9 shows the corresponding functional diagram with a limit indicator 22 and a switch-on delay 24. provides.
- the limit indicator 22 must be blocked by means of a block signal Block2, if, for example, the tool is in the form of a milling cutter and the milling cutter has already penetrated into the workpiece up to its diameter in order to avoid false triggering.
- the module 32 for monitoring a force acting on the machine element force F M Kollisionsüberwa ⁇ monitoring performed in which the comparing on the machine element single-acting force F M with a force limit value F MG, wherein on exceeding the force limit value F MG to a collision is detected.
- a correspondingêtsdia ⁇ gram is shown in FIG 5.
- the force on the machine element force F M can thereby be derived from the drive current of the machine axis, for example, or it can spe cial ⁇ force sensors are attached to the machine, which measure the force F M directly. If the limit indicator 12 outputs a corresponding signal when the force limit value F MG is exceeded, a collision is detected.
- an acceleration of the object and / or the machine element with a Accelerati ⁇ be supply-limit compared and be recognized for exceeding the acceleration threshold for a collision.
- the acceleration can be measured, for example, by means of acceleration sensors.
- the collision detection modules 29, 30, 31 and 32 can perform a permanent monitoring or perform only for a predetermined period of time after detecting a contact monitoring.
- a further decision block 37 checks whether timely stopping by means of a check is still performed the current state of the machine axis (eg in terms of mass, speed, vibration behavior) adapted speed reduction of Machine axis is possible, wherein if possible, the machine axis is stopped by an adapted speed reduction to perform the braking process as possible without vibrations or deviations of the machine axis of a given trajectory.
- the stopping by means of an adapted speed reduction is carried out in a stop module 39. If stopping by means of an adapted speed reduction is no longer possible, the drive of the machine axis is stopped immediately by means of the emergency stop module 40.
- decision block 25 determines that no automatic ⁇ tarraes method exists, that means the machine axis during contact by an operator by hand is moved and is generated by the operator, a processing signal, for example by means of ei ⁇ nes keys pressure, which block in a decision ⁇ queried 27 is, then a collision detection is carried out, wherein when detected collision another Ver ⁇ drive the machine axis is stopped.
- the processing signal indicates that the operator wants to perform a machining of the workpiece, for example, in manual mode
- a decision ⁇ block 28 is determined whether there is still a timely stop is possible by a matched velocity decrease of the machine. If this is still possible, then the machine axis is stopped by the stop module 38 by means of an adapted speed reduction, and if this is not possible, then the drive of the machine axis by the emergency stop module 40 is stopped immediately.
- the operator can thus manually intervene in the process.
- the operator may set the setup signal by optionally pressing a key. This will express that the ⁇ pitch to change so greatly reduced ensuring that economic appropriate damage reduction is achieved by contact-based monitoring.
- the contact detection is shown by means of the evaluation of the detection current I n .
- the detection ⁇ current I D is a current limit value I G, which is preferably zero is compared.
- the current limit value I G underrange generating a corresponding output signal from the threshold detector 19, indicating a known ER contact.
- the collision detection is shown by evaluation of the travel speed v v .
- the speed of movement Vy is derived first by means of a differentiator 17 with respect to time and thus renzierers 17, the movement acceleration a v determined from the output of Diffe ⁇ , the egg ⁇ ner change of the traverse speed corresponding to v v.
- the limit indicator 18 When the travel acceleration a v exceeds a travel acceleration limit value a V c, the limit indicator 18 generates a signal indicating a contact.
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- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
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- Auxiliary Devices For Machine Tools (AREA)
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Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/910,340 US8457787B2 (en) | 2005-04-01 | 2006-03-29 | Method and control device for targeted reaction in the event of a contact between a machine element of a machine and an object |
JP2008503510A JP2008535071A (ja) | 2005-04-01 | 2006-03-29 | 機械の機械要素と対象物との間の接触時における目標とされる反応のための方法および制御装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102005015317A DE102005015317B4 (de) | 2005-04-01 | 2005-04-01 | Verfahren und Steuereinrichtung zur gezielten Reaktion bei einem Kontakt zwischen einem Maschinenelement einer Maschine mit einem Gegenstand |
DE102005015317.8 | 2005-04-01 |
Publications (2)
Publication Number | Publication Date |
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WO2006103249A2 true WO2006103249A2 (de) | 2006-10-05 |
WO2006103249A3 WO2006103249A3 (de) | 2007-03-22 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2006/061122 WO2006103249A2 (de) | 2005-04-01 | 2006-03-29 | Verfahren und steuereinrichtung zur gezielten reaktion bei einem kontakt zwischen einem maschinenelement einer maschine mit einem gegenstand |
Country Status (5)
Country | Link |
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US (1) | US8457787B2 (de) |
JP (1) | JP2008535071A (de) |
CN (1) | CN100543619C (de) |
DE (1) | DE102005015317B4 (de) |
WO (1) | WO2006103249A2 (de) |
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CN102016733B (zh) * | 2008-04-22 | 2013-06-12 | 三菱电机株式会社 | 数控方法及其装置 |
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2005
- 2005-04-01 DE DE102005015317A patent/DE102005015317B4/de active Active
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2006
- 2006-03-29 WO PCT/EP2006/061122 patent/WO2006103249A2/de active Application Filing
- 2006-03-29 US US11/910,340 patent/US8457787B2/en active Active
- 2006-03-29 CN CNB2006800110931A patent/CN100543619C/zh active Active
- 2006-03-29 JP JP2008503510A patent/JP2008535071A/ja active Pending
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US20010012973A1 (en) * | 1999-12-16 | 2001-08-09 | Peter Wehrli | Method and device for disturbance sensing, especially collision sensing, in the drive system of a numerically controlled machine tool |
EP1477284A1 (de) * | 2002-02-18 | 2004-11-17 | Kawasaki Jukogyo Kabushiki Kaisha | Antriebssteuerverfahren und antriebssteuerung |
Also Published As
Publication number | Publication date |
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WO2006103249A3 (de) | 2007-03-22 |
CN101156118A (zh) | 2008-04-02 |
US8457787B2 (en) | 2013-06-04 |
US20090048713A1 (en) | 2009-02-19 |
JP2008535071A (ja) | 2008-08-28 |
CN100543619C (zh) | 2009-09-23 |
DE102005015317B4 (de) | 2007-02-01 |
DE102005015317A1 (de) | 2006-10-05 |
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