EP3736085A1 - Sanding machine provided with a control system for working a workpiece and operation method thereof - Google Patents

Sanding machine provided with a control system for working a workpiece and operation method thereof Download PDF

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Publication number
EP3736085A1
EP3736085A1 EP20171151.2A EP20171151A EP3736085A1 EP 3736085 A1 EP3736085 A1 EP 3736085A1 EP 20171151 A EP20171151 A EP 20171151A EP 3736085 A1 EP3736085 A1 EP 3736085A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
sanding
temperature values
working
worked
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.)
Pending
Application number
EP20171151.2A
Other languages
German (de)
English (en)
French (fr)
Inventor
Marco Venturini
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.)
SCM Group SpA
Original Assignee
SCM Group SpA
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 SCM Group SpA filed Critical SCM Group SpA
Publication of EP3736085A1 publication Critical patent/EP3736085A1/en
Pending 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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/06—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor involving conveyor belts, a sequence of travelling work-tables or the like
    • 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
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • 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
    • 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
    • B24B49/14—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 taking regard of the temperature during grinding
    • 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
    • B24B51/00—Arrangements for automatic control of a series of individual steps in grinding a workpiece
    • 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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
    • B24B7/28—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding wood
    • 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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/22—Single-purpose machines or devices for particular grinding operations not covered by any other main group characterised by a special design with respect to properties of the material of non-metallic articles to be ground
    • B24B19/24—Single-purpose machines or devices for particular grinding operations not covered by any other main group characterised by a special design with respect to properties of the material of non-metallic articles to be ground of wood, e.g. furniture

Definitions

  • the present invention relates to a sanding machine provided with a control system for working a workpiece worked or being worked or to be worked in the machine itself.
  • the present invention also relates to the control system itself to be installed on a sanding machine.
  • the present invention also relates to the operating method of a sanding machine.
  • the invention relates to a quality control system for machining carried out by a sanding machine on a workpiece made of wood or also made of other materials such as plastic, glass, fiberglass, metal, ceramic and the like.
  • Sanding machines are therefore known, which are typically provided with a containment frame, having an inlet opening for the workpiece to be worked and an outlet opening for the worked workpiece.
  • a driving belt on which the workpiece to be worked slides, and several stations, provided with respective workpiece working tools.
  • one or more sanding units are provided, forming the sanding station, arranged movable on a guide transverse to the advancement direction of the workpiece to be worked.
  • said sanding units are capable of adapting to the position of the workpiece to be worked.
  • a check is carried out on the quality of the machining of the output workpiece, using measurement systems that detect the geometric surface irregularities of the worked workpiece.
  • the workpiece is measured geometrically to identify any irregulatities on the workpiece, which are distinctive signs of the quality of the working of the workpiece.
  • the vision system does not detect slight geometric irregularities on the surface of the workpiece.
  • It is a further object of the present invention providing a sanding machine provided with a control system for the workpiece machining to be carried out also at the end of the workpiece working.
  • It is still an object of the present invention providing a sanding machine provided with a workpiece working control system, which also allows to detect the wear state of the sanding units or generally of any tool in contact with the workpiece.
  • It is an object of the present invention providing an effective and reliable control system to be installed on sanding machines to control the workpiece working process and the state of wear of the sanding tools and/or the quality control of the working.
  • a sanding machine for working a workpiece made in wood, plastic, glass, fiberglass, metal, ceramic and the like comprising an inlet station for the entry of said workpiece to be worked and an outlet station for the exit of the worked workpiece, a conveyor group for conveying said workpiece to be worked, along a feed direction, from said inlet station towards said outlet station, at least one working unit of said workpiece comprising a sanding tool provided with an abrasive surface for working said workpiece, said sanding machine being characterized in that it comprises a control system configured to detect the temperature values of the surface of said workpiece and/or of the abrasive surface of said sanding tool.
  • said control system comprises a logic control unit, in which threshold temperature values of the surface of said workpiece and/or of the abrasive surface of said sanding tool are stored, said threshold temperature values being predefined or acquired in a working test step of said workpiece and then stored as threshold values, said control system comprises at least one temperature detection device capable of detecting the temperature values of the surface of said workpiece and/or of the abrasive surface of said sanding tool and of sending them to said logic control unit, and said logic control unit is configured to compare said threshold temperature values and said temperature values detected by said at least one temperature detection device and to operate controls on said sanding machine and/or to emit alarm signals and/or to block the working of said sanding machine, if said detected temperature values are higher or lower than said threshold temperature values.
  • said controls are: modifying the cutting speed of said sanding tool, and/or modifying the speed of feeding of said conveyor group, and/or modifying the relative position of said sanding tool according to the thickness of said workpiece, and/or providing information for the loading area of said conveyor group.
  • said at least one temperature detection device is arranged in correspondence of said inlet station, and/or in correspondence of said outlet station, and/or on said sanding tool.
  • said temperature detection device is a thermal imaging camera.
  • control system for working a workpiece made in wood, plastic, glass, fiberglass, metal, ceramic and the like, which can be installed on a sanding machine, of the type comprising an inlet station for the entry of said workpiece to be worked, an outlet station for the exit of the worked workpiece, a conveyor group for conveying said workpiece to be worked, along a feed direction, from said inlet station towards said outlet station, at least one working unit of said workpiece comprising a sanding tool provided with an abrasive surface for working said workpiece, said control system being characterized in that it comprises a logic control unit, in which threshold temperature values are stored, at least one temperature detection device capable of detecting the temperature values of the surface of said workpiece and/or of the abrasive surface of said sanding tool and of sending them to said logic control unit, and said logic control unit is configured to compare said threshold temperature values and said temperature values detected by said at least one temperature detection device and to operate controls on said sanding machine and/or
  • said at least one temperature detection device can be installed in correspondence of said inlet station, and/or in correspondence of said outlet station, and/or on said sanding tool.
  • a sanding machine of the type comprising an inlet station for the entry of said workpiece to be worked, an outlet station for the exit of the worked workpiece, a conveyor group for conveying said workpiece to be worked, along a feed direction, from said inlet station towards said outlet station, at least one working unit of said workpiece comprising a sanding tool provided with an abrasive surface for working said workpiece, said method being characterized in that it comprises the following steps:
  • said threshold temperature values stored in said step a. are predefined temperature values according to the kind of working to be operated.
  • said step a comprises the following sub-steps:
  • said controls activated in said step f. are the following: modifying the cutting speed of said sanding tool, and/or modifying the speed of feeding of said conveyor group, and/or modifying the relative position of said sanding tool according to the thickness of said workpiece, and/or providing information for the loading area of said conveyor group.
  • the sanding machine M object of the present invention essentially comprises an inlet station 1, where the workpieces P to be worked are intoduced according to a feed direction A, parallel to the X-axis of the Cartesian reference system, an outlet station 2, from which the machined workpieces P, according to the same direction A, exit, a conveyor group 3, for transporting the workpieces P to be worked according to said feed direction A from said inlet station 1 towards said outlet station 2, at least one working unit 4, for carrying out the sanding operations on said workpieces P, and a control system 5, for controlling the machining of the workpieces P.
  • said conveyor group 3 comprises a conveyor belt 31, on which the workpiece P to be worked is placed, which is transported from said inlet station 1 to said outlet station 2 according to the feed direction A.
  • Said at least one working unit 4 comprises a sanding tool 41, provided with an abrasive surface, facing the underlying conveyor belt 31 to come into contact with the upper surface of the workpiece P, arranged above the same conveyor belt 31.
  • Said sanding tool 41 is arranged between said inlet station 1 and said outlet station 2.
  • Said sanding tool 41 can also be arranged close to said inlet station 1 or close to said outlet station 2.
  • Said control system 5 of the workpiece P machining is installed on said sanding machine M, to check the condition of the tools during the working of the workpiece P, or at the end of the working of the workpiece.
  • Said control system 5 comprises at least one temperature detection device 51, such as a thermal imager or a thermal imaging camera, and a logic control unit U, which can also be integrated in the control unit of the sanding machine 1.
  • a temperature detection device 51 such as a thermal imager or a thermal imaging camera
  • a logic control unit U which can also be integrated in the control unit of the sanding machine 1.
  • Said thermal imaging camera 51 is sensitive to the infrared radiation generated by the surface of the workpiece P being worked or worked and/or by the state of the abrasive surface of said sanding tool 41, and it is capable of producing images or thermographic recordings.
  • Said thermal imaging camera 51 comprises a sensor, not shown in the figure, capable of continuously detecting the temperature value of a point portion of the surface of said workpiece P, or of the entire surface of the workpiece P, during the working by said sanding tool 41.
  • said sensor of said thermal imaging camera 51 is also capable of continuously detecting the temperature value of a point portion of the abrasive surface of said sanding tool 41, or of the entire abrasive surface of said sanding tool 41, during the working of the workpiece P.
  • Said temperature values detected by said thermal imaging camera 51 are sent to said logic control unit U.
  • Said logic control unit U keeps in memory the threshold temperature values relating to a point portion of the surface of said workpiece P, or of the entire surface of the workpiece P, during the working by said sanding tool 41, and of a point portion of the abrasive surface of said sanding tool 41, or of the entire surface of said sanding tool 41, during the working of the workpiece P.
  • Said threshold values can be predefined on the basis of the type of working to be performed on said workpiece P.
  • said threshold values can also be acquired in a working test step of the workpiece P, to be then stored and used as threshold values.
  • Said logic control unit U is capable of making a comparison between the temperature values detected and sent by said thermal imaging camera 51 and said threshold values.
  • said logic control unit U is capable of operating the following controls, if the measured temperature values are higher than, or lower than the threshold values: change the characteristic settings of a working, such as cutting speed by the sanding tool 41, forward speed of the conveyor belt 31, relative position according to the Z-axis of the sanding tool 41 according to the nominal thickness of the workpiece P being worked, to provide indications for optimizing the loading area of the conveyor belt 31, if there are systems indicating the area of the conveyor belt 31, which loading the workpiece P on.
  • a working such as cutting speed by the sanding tool 41, forward speed of the conveyor belt 31, relative position according to the Z-axis of the sanding tool 41 according to the nominal thickness of the workpiece P being worked
  • said logic control unit U is capable of directly emitting alarm signals or to block the operation of the machine M itself.
  • said thermal imaging camera 51 makes temperature maps of the exposed surfaces of the workpiece P and/or of the abrasive surface of said sanding tool 41 for subsequent working.
  • control system 5 It is possible to arrange said control system 5 according to different configurations.
  • said control system 5 comprises a thermal imaging camera 51 arranged in correspondence of said outlet station 2 of said sanding machine M.
  • Said thermal imaging camera 51 continuously detects the temperature value of a point portion of the surface of said workpiece P, or of the whole surface of the workpiece P, exiting from said machine M, then at the end of the working by said sanding tool 41.
  • Said thermal imaging camera 51 sends said measured temperature values to said logic control unit U.
  • said control system 5' comprises a thermal imaging camera 51 arranged on said sanding tool 41.
  • Said thermal imaging camera 51 continuously detects the temperature value of a point portion of the abrasive surface of said sanding tool 41, or of the entire surface of said sanding tool 41.
  • Said thermal imaging camera 51 sends said measured temperature values to said logic control unit U.
  • said control system 5" comprises a first thermal imaging camera 51 arranged in correspondence of said outlet station 2 of said sanding machine M.
  • Said first thermal imaging camera 51 continuously detects the temperature value of a point portion of the surface of said workpiece P, or of the entire surface of the workpiece P, exiting from said machine M, then at the end of the working by said sanding tool 41.
  • control system 5" comprises a second thermal imaging camera 51', arranged on said sanding tool 41.
  • Said second thermal imaging camera 51' continuously detects the temperature value of a point portion of the abrasive surface of said sanding tool 41, or of the entire abrasive surface of said sanding tool 41.
  • Both said first thermal imaging camera 51 and said second thermal imaging camera 51' send said measured temperature values to said logic control unit U.
  • control system 5 in correspondence of said inlet station 1.
  • control system 5 both in correspondence of said inlet station 1 and in correspondence of said outlet station 2.
  • control system 5 both in correspondence of said inlet station 1, and in correspondence of said outlet station 2, and on said sanding tool 41.
  • a further combination provides for arranging said control system 5 both in correspondence of said inlet station 1 and on said sanding tool 41.
  • Said workpiece P is transported by said conveyor belt 31 according to the feed direction A inside the machine, and passes under said working unit 4, where it undergoes a first sanding operation by the sanding tool 41.
  • said workpiece P is transported by said conveyor belt 31 under the other further working units 4, where it undergoes further sanding operations.
  • said control system 5 continuously detects the temperature value of a point portion of the surface of said workpiece P, or of the entire surface of workpiece P, exiting from said machine M, then at the end of the working by said sanding tool 41.
  • Said thermal imaging camera 51 sends said measured temperature values to said logic control unit U.
  • Said logic control unit U performs a comparison between the threshold values and said values detected by said thermal imaging camera 51.
  • said logic control unit U operates the controls described above, or, if said controls cannot be operated, it emits alarm signals or commands the blocking of said sanding machine M.
  • said control system 5' continuously detects the temperature value of a point portion of the abrasive surface of said sanding tool 41, or of the whole abrasive surface of said sanding tool 41.
  • Said thermal imaging camera 51 sends said measured temperature values to said logic control unit U.
  • Said logic control unit U performs the same operations described above in regards the first embodiment.
  • said control system 5" carries out the following measurements.
  • said first thermal imaging camera 51 continuously detects the temperature value of a point portion of the surface of said workpiece P, or of the entire surface of the workpiece P, upon exiting from said machine M, therefore at the end of the working by said sanding tool 41.
  • said second thermal imaging camera 51' continuously detects the temperature value of a point portion of the abrasive surface of said sanding tool 41, or of the entire abrasive surface of said sanding tool 41.
  • Both said first thermal imaging camera 51, and said second thermal imaging camera 51' send said measured temperature values to said logic control unit U.
  • Said logic control unit U performs a comparison between the threshold values and said values detected by said first 51 and second 51' thermal imaging camera.
  • the sanding machine provided with a control system for the working of a workpiece, object of the present invention, allows to quickly and accurately detect any machining irregularities present on the surface of the workpiece worked or to be worked, and also to detect any malfunctionings of the sanding tool.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP20171151.2A 2019-05-07 2020-04-23 Sanding machine provided with a control system for working a workpiece and operation method thereof Pending EP3736085A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000006596A IT201900006596A1 (it) 2019-05-07 2019-05-07 Macchina levigatrice provvista di un sistema di controllo della lavorazione di un pezzo e metodo di funzionamento relativo.

Publications (1)

Publication Number Publication Date
EP3736085A1 true EP3736085A1 (en) 2020-11-11

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EP20171151.2A Pending EP3736085A1 (en) 2019-05-07 2020-04-23 Sanding machine provided with a control system for working a workpiece and operation method thereof

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EP (1) EP3736085A1 (it)
IT (1) IT201900006596A1 (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3831531A1 (en) * 2019-12-02 2021-06-09 SCM Group S.p.A. Working machine for wooden pieces and the like, provided with a working simulation program, and operating method thereof
CN114871908A (zh) * 2022-05-11 2022-08-09 广州华夏职业学院 一种装饰木制品加工用表面平整装置
CN116372808A (zh) * 2023-04-18 2023-07-04 肇庆高峰机械科技有限公司 一种高精度数控垂直度磨床的控制系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06246633A (ja) * 1993-02-25 1994-09-06 Cat Syst:Kk ブラシロール・研磨研削ロール等の表面処理用ロール の制御方法及びその装置
WO1998053377A1 (de) * 1997-05-23 1998-11-26 Interholz Technik Gmbh Regelsystem und verfahren zur regelung von bearbeitungsgeschwindigkeiten bei der holzbearbeitung
DE202017105160U1 (de) * 2017-05-18 2018-08-22 Steinemann Technology Ag Bandschleifvorrichtung zum Überwachen eines Schleifbandes
DE102017208498A1 (de) * 2017-05-19 2018-12-06 Homag Bohrsysteme Gmbh Verfahren zur Bestimmung eines Zustands eines Schleifmittels und Schleifvorrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06246633A (ja) * 1993-02-25 1994-09-06 Cat Syst:Kk ブラシロール・研磨研削ロール等の表面処理用ロール の制御方法及びその装置
WO1998053377A1 (de) * 1997-05-23 1998-11-26 Interholz Technik Gmbh Regelsystem und verfahren zur regelung von bearbeitungsgeschwindigkeiten bei der holzbearbeitung
DE202017105160U1 (de) * 2017-05-18 2018-08-22 Steinemann Technology Ag Bandschleifvorrichtung zum Überwachen eines Schleifbandes
DE102017208498A1 (de) * 2017-05-19 2018-12-06 Homag Bohrsysteme Gmbh Verfahren zur Bestimmung eines Zustands eines Schleifmittels und Schleifvorrichtung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3831531A1 (en) * 2019-12-02 2021-06-09 SCM Group S.p.A. Working machine for wooden pieces and the like, provided with a working simulation program, and operating method thereof
CN114871908A (zh) * 2022-05-11 2022-08-09 广州华夏职业学院 一种装饰木制品加工用表面平整装置
CN114871908B (zh) * 2022-05-11 2023-05-16 广州华夏职业学院 一种装饰木制品加工用表面平整装置
CN116372808A (zh) * 2023-04-18 2023-07-04 肇庆高峰机械科技有限公司 一种高精度数控垂直度磨床的控制系统
CN116372808B (zh) * 2023-04-18 2023-10-27 肇庆高峰机械科技有限公司 一种高精度数控垂直度磨床的控制系统

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