EP2147745A1 - Machine de superfinition dotée d'une bande de meulage et procédé de fonctionnement d'une machine de superfinition - Google Patents

Machine de superfinition dotée d'une bande de meulage et procédé de fonctionnement d'une machine de superfinition Download PDF

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Publication number
EP2147745A1
EP2147745A1 EP08013396A EP08013396A EP2147745A1 EP 2147745 A1 EP2147745 A1 EP 2147745A1 EP 08013396 A EP08013396 A EP 08013396A EP 08013396 A EP08013396 A EP 08013396A EP 2147745 A1 EP2147745 A1 EP 2147745A1
Authority
EP
European Patent Office
Prior art keywords
belt
abrasive belt
light barrier
abrasive
optical system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08013396A
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German (de)
English (en)
Inventor
Hermann Dipl. Ing. Billharz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Supfina Grieshaber GmbH and Co KG
Original Assignee
Supfina Grieshaber GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Supfina Grieshaber GmbH and Co KG filed Critical Supfina Grieshaber GmbH and Co KG
Priority to EP08013396A priority Critical patent/EP2147745A1/fr
Priority to CN200910151148A priority patent/CN101633142A/zh
Publication of EP2147745A1 publication Critical patent/EP2147745A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B35/00—Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/004—Machines or devices using grinding or polishing belts; Accessories therefor using abrasive rolled strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/12—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving optical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/006—Tools consisting of a rolled strip of flexible material

Definitions

  • Superfinishing machines that work with a sanding belt have been known for a long time. Superfinishing is also known as short-stroke honing.
  • the abrasive belt has two tasks in the superfinishing of workpieces. First, the surface of the workpiece is machined with the sharp abrasive grains in the abrasive belt. In the course of processing, the tips of the abrasive grains wear off and the abrasive belt settles. This reduces the removal rate of the grinding belt and as a result, the surface of the workpiece is smoothed. For every workpiece a new section of unconsumed sanding belt is needed.
  • a transport device which usually includes a transport roller, driven accordingly.
  • abrasive belt In order to detect the tearing of the abrasive belt, it is common in marketed machines to guide the abrasive belt via a spring-loaded button or plunger. Due to the pre-tension of the abrasive belt, the button is held in a certain position, which is an indication of an intact abrasive belt. When the abrasive belt breaks, the plunger is moved by a spring from this position and thereby an electrical contact is interrupted or closed. This change in the position of the plunger is converted into a corresponding electrical signal and evaluated as an error message or as a message about the crack of the abrasive belt in the machine control.
  • a disadvantage of this monitoring of the abrasive belt is that a band break can only be detected if the abrasive belt breaks in the vicinity of the plunger. Namely, if the abrasive belt breaks at a different location, it may be that the remaining residual tension of the abrasive belt is still sufficient to hold the plunger in the first position, so that an error message is not issued.
  • the invention has for its object to provide an improved monitoring of the abrasive belt while minimizing the consumption of abrasive belt.
  • This object is achieved according to the invention in a superfinishing machine, with a grinding belt, with a grinding belt clamping device, with a transport device for the grinding belt and with means for monitoring the grinding belt, in that the means for monitoring the grinding belt are formed as an optical system.
  • optical system in the context of the invention means optical sensors including the subsequent evaluation of the output signals of the optical sensors.
  • optical systems are light barriers, in which a sharply focused light beam is directed onto the grinding belt, reflected by it, and the reflected light beam is detected, for example, by a photodiode or a plurality of photodiodes and converted into an output signal.
  • an image of the grinding belt can also be recorded and evaluated.
  • the optical systems have in common that they can distinguish between standstill and movement of the grinding belt. Some optical systems can additionally determine the distance traveled by the grinding belt. Since the invention does not relate to the optical system itself, but can rely on marketed products, a detailed description of the operation is omitted here. In the following, the said "optical systems" are referred to as photocell for the sake of simplicity.
  • an optical system in particular a light barrier
  • At least one light barrier is positioned at the beginning of the superfinishing machine, ie where the fresh abrasive belt is unwound from a roll, and the actual processing of the workpiece takes place between the light barrier and the transport device.
  • At least one light barrier is designed as a through-beam sensor, a particularly compact and simple design can be realized.
  • Commercially available through-beam sensors can be supplied, for example, with a diameter of twelve or eighteen millimeters as commercial products. It is then housed by screwing in such a through-beam sensor both the transmitter and the associated receiver in a housing, which simplifies the attachment and of course the wiring of the light barrier.
  • laser light in particular having a wavelength of approximately 650 nanometers, is used as the light source of the at least one light barrier.
  • the laser light has the advantage of providing a very thin beam of less than 1.5 millimeters in diameter. This makes it possible to reliably detect even the smallest movements of the grinding belt, because even with the smallest movements of the grinding belt, the reflection behavior of the grinding belt changes. Furthermore, it is possible to detect also the distance traveled by the grinding belt. As a result, additional monitoring or control functions of the superfinishing machine are possible without incurring additional costs.
  • the invention is not limited to one-way laser light barriers, but it may be other commercially available photocells, for example, have one or more LEDs as a light source, are used.
  • a clamping device for the grinding belt is provided in a further advantageous embodiment of the invention.
  • one or more known honing shells are provided in a further advantageous embodiment, over which the grinding belt is guided.
  • the object mentioned at the outset is likewise achieved by a sanding belt for finishing machines with a front side and a rear side, the abrasive material being bound on the front side, achieved by marking the sanding belt in the longitudinal direction of the sanding belt at regular intervals.
  • the markings according to the invention can be applied to the back and / or the front of the abrasive belt.
  • abrasives of the abrasive belt To use markings.
  • the roughness of the abrasive paper on the back as a marker.
  • the object mentioned at the outset is also achieved by a method for operating a superfinishing machine, with a grinding belt, with a grinding belt clamping device, with a transport device for the grinding belt and with at least one light barrier for monitoring the grinding belt with which the workpiece is machined the worn portion of the abrasive belt is replaced after processing a workpiece by an unconsumed portion of the abrasive belt, simultaneously detecting movement of the abrasive belt by the at least one light barrier and outputting an error message if the abrasive belt is not moving even though the transport device is active.
  • This method allows error-free detection of tape breaks, because regardless of what happens between the photocell and the transport device with the torn abrasive belt, the abrasive belt in the area of the light barrier can not be transported by the transport device arranged further back when the tape torn is.
  • Another advantage of the method according to the invention is that without additional hardware in an intact Abrasive belt, the transport movement of the abrasive belt can be detected. This makes it possible to control the transport of the abrasive belt by the transport device is switched off when the target feed of the abrasive belt is reached. The nominal feed is determined depending on the geometry of the workpiece and the honing cups. Due to the transition from a control of the abrasive belt transport according to the prior art to a control according to the invention, the safety margins during transport of the abrasive belt and thus the consumption of the abrasive belt can be significantly reduced to that. This reduces the consumption of sanding belt by up to 50%, which translates into correspondingly reduced costs for the sanding belt.
  • FIG. 1 shows a schematic side view of a superfinishing machine according to the invention.
  • the superfinishing machine 1 according to the invention is used in the in FIG. 1 illustrated embodiment for superfinishing a cylindrical workpiece 3, such as a bearing of a crankshaft.
  • FIG. 1 are above the honing cup 7, a clamping device 9 and a light barrier 11 according to the invention arranged. Below the honing bowl 7, the grinding belt is still deflected by various roles until it is finally passed over a transport roller 13.
  • the sanding belt 5 is pressed onto the transport roller 13. This can be done for example via a pressure roller, not shown.
  • the transport roller 13 is in the in FIG. 1 illustrated embodiment via a gear 15 and a crank 17 with a linear actuator 19 is actuated. Between the crank 17 and the gear 15 is an unillustrated freewheel available, so that the transport roller 13 can be transported by repeated actuation of the linear actuator 19 as far as desired.
  • the grinding belt 5 moves from above first past the light barrier 11 through the clamping device 9 via the honing bowl 7 and is then transported over the transport roller 13.
  • the clamping device 9 is activated, so that the grinding belt 5 can not be tightened further.
  • the transport roller 13 is acted upon in the transport direction with a predetermined torque, so that the abrasive belt 5 has a bias.
  • the workpiece 3 and the superfinishing machine 1 are moved toward each other.
  • the workpiece 3 is set in rotation and the grinding belt 5 and the honing cup 7 perform an oscillating movement in a direction which is perpendicular to the plane of the drawing.
  • the light barrier 11 is activated according to the invention. If the sanding belt 5 is undamaged, the sanding belt 5 is pulled past the photocell 11 with the clamping device 9 open by the rotation of the transport wheel 13. This movement of the grinding belt is detected by the light barrier 11.
  • the light barrier 11 operates in the illustrated embodiment with a laser light source and is directed to the back of the abrasive belt 5. Due to the changed reflection behavior of the abrasive belt 5, when it is set in motion, the light barrier 11 outputs a corresponding output signal to the unillustrated control of the superfinishing machine. As a result, the controller of the superfinishing machine recognizes that the grinding belt 5 is intact.
  • the light barrier 11 according to the invention in particular when working with a laser light source, can not only provide an output signal which contains information as to whether the grinding belt 5 is moving or stationary. Rather, it is also possible to determine the path which executes the abrasive belt 5. This information can be used to control the feed of the abrasive belt 5. This means nothing else than that the sanding belt 5 is only moved by exactly the distance until the honing bowl 7 is completely covered again by unconsumed fresh sanding belt 5. Subsequently, the processing of the next workpiece 3 can take place.
  • the inventive detection of the transport of the abrasive belt 5 and the corresponding feedback or control of the transport roller 15 allows a significant reduction in consumption Sanding belt, since the sanding belt 5 can be fully utilized over its entire length.
  • conventional superfinishing machine 1 is usually worked with a safety margin of 10 - 50%, since the tape feed is only controlled and not regulated.
  • the grinding belt 5 should be torn, then the grinding belt 5 does not move past the light barrier 11 despite the open clamping device 9 and the rotating transport roller 13. As a result, the output signal of the light barrier 11 changes with respect to an intact abrasive belt 5, which is detected by the controller.
  • FIG. 2 another embodiment of a superfinishing machine according to the invention is shown.
  • the same components are provided with the same reference numerals and it is the respect FIG. 1 Said accordingly.
  • the essential difference between the embodiments according to FIG. 1 and 2 is that two honing shells 7.1 and 7.2 are used in the second embodiment and the tape guide is done differently.
  • FIG. 3 a section of the rear side of a grinding belt 5 according to the invention is shown. On the back of the abrasive belt 5 rectangular marks 21 are printed. If, instead of a light barrier 11 with a laser light source, a light barrier 11 with, for example, an LED as the light source is used, it is also possible to monitor the transport of the abrasive belt 5 with the aid of the markings 21.
  • the light source of the light barrier 11, not shown, is directed to the markings, so that during transport of the abrasive belt 5 in the longitudinal direction alternately a sequence of dark marks 21 and bright spaces 23 is transported under the light barrier 11 past. As a result, it can be firstly determined whether the sanding belt 5 is moving. By counting the markings 21 and / or the gaps 23, moreover, the path that the grinding belt 5 has been transported can be determined. The length of the marks L M and the length of the gaps 23 L Z is in FIG. 3 entered.
  • the sanding belt 5 deviates laterally, then the markings 21 move out of the working range of the light barrier 11 (not shown) so that the light barrier 11, despite the transport of the sanding belt 5, does not recognize any sequence of dark markings 21 and light gaps 23. As a result, the light barrier 11 outputs an error signal and the superfinishing machine is stopped.
  • FIG. 4 an embodiment of a method according to the invention is shown.
  • the clamping device 9 is released in a first functional block 25 and the transport device is activated. This means that, for example, the transport roller 13 is driven and driven.
  • a further block 33 it is compared whether the traveled path of the grinding belt 5 is less than or equal to a predetermined desired value. If the distance traveled by the abrasive belt 5 is greater than or equal to the target value, then in a functional block 35, the transport device is switched off and the method is ended.
  • the program branches again before the function block 31 (detecting the path of the grinding belt).
  • an error message is output in a function block 37. This error message can then trigger an audible warning signal and / or lead to a shutdown of the superfinishing machine 1 with the aid of the machine control.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP08013396A 2008-07-25 2008-07-25 Machine de superfinition dotée d'une bande de meulage et procédé de fonctionnement d'une machine de superfinition Withdrawn EP2147745A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08013396A EP2147745A1 (fr) 2008-07-25 2008-07-25 Machine de superfinition dotée d'une bande de meulage et procédé de fonctionnement d'une machine de superfinition
CN200910151148A CN101633142A (zh) 2008-07-25 2009-07-27 具有砂带的超精加工机床和使超精加工机床运转的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08013396A EP2147745A1 (fr) 2008-07-25 2008-07-25 Machine de superfinition dotée d'une bande de meulage et procédé de fonctionnement d'une machine de superfinition

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Publication Number Publication Date
EP2147745A1 true EP2147745A1 (fr) 2010-01-27

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EP08013396A Withdrawn EP2147745A1 (fr) 2008-07-25 2008-07-25 Machine de superfinition dotée d'une bande de meulage et procédé de fonctionnement d'une machine de superfinition

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EP (1) EP2147745A1 (fr)
CN (1) CN101633142A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015124205A1 (fr) * 2014-02-21 2015-08-27 Supfina Grieshaber Gmbh & Co. Kg Dispositif de finition à bande et procédé de commande du déplacement d'une bande de finition
DE102017121293A1 (de) * 2017-09-14 2019-03-14 Thielenhaus Technologies Gmbh Vorrichtung zur Bearbeitung eines Werkstückes mittels eines Bandes und Verfahren zum Betreiben einer entsprechenden Vorrichtung
US11236879B2 (en) 2018-02-13 2022-02-01 Hasco Vision Technology Co., Ltd. Vehicle lamp system, vehicle lamp, and method for manufacturing vehicle lamp system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014208319B4 (de) * 2014-05-05 2021-05-06 Supfina Grieshaber Gmbh & Co. Kg Bandfinishvorrichtung und Verfahren zum Betrieb einer Bandfinishvorrichtung
DE102016111155B4 (de) * 2016-06-17 2024-02-29 Supfina Grieshaber Gmbh & Co. Kg Finishband-Klemmeinrichtung und Finishvorrichtung
CN107457657A (zh) * 2017-08-30 2017-12-12 山西新环橡塑制品有限公司 一种超精机
DE102017123824B4 (de) * 2017-10-13 2020-06-04 Schaeffler Technologies AG & Co. KG Honmaschine und Verwendung einer Honmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4426923A1 (de) * 1994-07-29 1996-02-01 Grieshaber Masch Vorrichtung zur Oberflächenbearbeitung von Werkstücken
WO2002043925A1 (fr) * 2000-11-29 2002-06-06 3M Innovative Properties Company Article abrasif comprenant un systeme de fenetre, destine au polissage des plaquettes, et procedes
US20060025045A1 (en) * 2004-07-28 2006-02-02 3M Innovative Properties Company System and method for detecting abrasive article orientation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4426923A1 (de) * 1994-07-29 1996-02-01 Grieshaber Masch Vorrichtung zur Oberflächenbearbeitung von Werkstücken
WO2002043925A1 (fr) * 2000-11-29 2002-06-06 3M Innovative Properties Company Article abrasif comprenant un systeme de fenetre, destine au polissage des plaquettes, et procedes
US20060025045A1 (en) * 2004-07-28 2006-02-02 3M Innovative Properties Company System and method for detecting abrasive article orientation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015124205A1 (fr) * 2014-02-21 2015-08-27 Supfina Grieshaber Gmbh & Co. Kg Dispositif de finition à bande et procédé de commande du déplacement d'une bande de finition
DE102017121293A1 (de) * 2017-09-14 2019-03-14 Thielenhaus Technologies Gmbh Vorrichtung zur Bearbeitung eines Werkstückes mittels eines Bandes und Verfahren zum Betreiben einer entsprechenden Vorrichtung
WO2019053128A2 (fr) 2017-09-14 2019-03-21 Thielenhaus Technologies Gmbh Dispositif de finition d'une pièce à l'aide d'une bande de finition et procédé de fonctionnement d'un dispositif correspondant
US11236879B2 (en) 2018-02-13 2022-02-01 Hasco Vision Technology Co., Ltd. Vehicle lamp system, vehicle lamp, and method for manufacturing vehicle lamp system

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Publication number Publication date
CN101633142A (zh) 2010-01-27

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