US20130252513A1 - Feeler for workpieces being machined - Google Patents

Feeler for workpieces being machined Download PDF

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Publication number
US20130252513A1
US20130252513A1 US13/847,846 US201313847846A US2013252513A1 US 20130252513 A1 US20130252513 A1 US 20130252513A1 US 201313847846 A US201313847846 A US 201313847846A US 2013252513 A1 US2013252513 A1 US 2013252513A1
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US
United States
Prior art keywords
feeler
sensor
workpiece
rocking arm
feelers
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.)
Abandoned
Application number
US13/847,846
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English (en)
Inventor
Gianni Trionfetti
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.)
Balance Systems SRL
Original Assignee
Balance Systems SRL
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 Balance Systems SRL filed Critical Balance Systems SRL
Assigned to BALANCE SYSTEM S.R.L. reassignment BALANCE SYSTEM S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TRIONFETTI, GIANNI
Publication of US20130252513A1 publication Critical patent/US20130252513A1/en
Priority to US15/292,839 priority Critical patent/US10591268B2/en
Assigned to BALANCE SYSTEMS S.R.L. reassignment BALANCE SYSTEMS S.R.L. CORRECTIVE ASSIGNMENT TO CORRECT THE RECEIVING PARTY'S NAME PREVIOUSLY RECORDED AT REEL: 030054 FRAME: 0244. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Assignors: TRIONFETTI, GIANNI
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/22—Feeler-pin gauges, e.g. dial gauges
    • 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
    • B24B49/02—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 according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
    • B24B49/04—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 according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent involving measurement of the workpiece at the place of grinding during grinding operation
    • B24B49/045—Specially adapted gauging instruments
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/001—Constructional details of gauge heads
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/12—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring diameters

Definitions

  • the present invention relates to a feeler for workpieces being machined, comprising a rocking arm adapted to feel the workpiece and a first sensor adapted to measure the position of the rocking arm.
  • the invention relates to a tool for measuring and evaluating the quality of a machining operation by chip removal usable during machining, i.e. while the workpiece is positioned on the chip-removal machine and is machined thereby.
  • the feeler being the object of the invention is adapted to be used for checking the diameters and circularity of a workpiece while it is being machined on a grinding machine.
  • an appropriate measuring device for checking the sizes and tolerance of a workpiece, in particular during grinding, an appropriate measuring device is used.
  • This device comprises at least one feeler, contacting the surface of the workpiece and connected to a measuring apparatus. The latter, based on displacements of the feeler, detects sizes and signals them to the machine tool possibly operating intervention or stoppage thereof.
  • the measuring device for measuring a diameter of a grinding shaft, the measuring device is provided with two feelers brought into contact with the workpiece at diametrically opposite sides. Otherwise, for measuring the axial position of a shoulder or the like for example, only one feeler is provided.
  • Each feeler at one end comprises an arm having a contact element adapted to feel the piece to be measured and a measuring head adapted to enable the arm displacements to be converted into suitable electric signals that can be analysed by the measuring apparatus.
  • the operator employing the measuring device for utilising and carrying out said size and tolerance controls acts as follows. First of all, he/she calibrates the feeler on the sizes of a certified sample. Subsequently, he/she moves the certified sample away from the feeler, disposes the feeler on the workpiece and starts machining, in particular grinding.
  • the feeler measures the size with the greatest accuracy and signals to the machine when the correct size has been reached, i.e. the size established during the planning step.
  • a first important problem is represented by the fact that sometimes the operator accidentally knocks against the feelers, after setting the reference size obtained from the sample so that in some cases the reference measure may be impaired. This drawback is further worsened by the fact that usually the operator becomes aware of the wrong measure only after many machining operations, which will give rise to many scraps or to the necessity to carry out new machining operations.
  • the technical task underlying the present invention is to conceive a feeler for workpieces being machined capable of substantially obviating the mentioned drawbacks.
  • a feeler for workpieces being machined comprising a rocking arm adapted to feel the workpiece and a first sensor adapted to measure the position of the rocking arm, and at least one additional sensor operatively connected to the rocking arm and adapted to detect external perturbations acting on the feeler.
  • FIG. 1 a shows a measuring device including the feeler
  • FIG. 1 b represents a further example of use of the feeler according to the invention.
  • FIG. 2 a shows the results of an analysis related to roughness of the workpiece carried out using the feeler of the invention.
  • FIG. 2 b shows the results of another analysis in connection with the presence of accidental forces and carried out using the feeler.
  • the feeler for workpieces being machined according to the invention is generally identified by reference numeral 1 .
  • Feeler 1 is adapted to be used for measuring the quality of a machining operation by chip removal while the operation is being carried out.
  • Feeler 1 is therefore adapted to be disposed close to a chip-removal machine tool 50 , in particular a grinding machine, comprising a tool 51 , such as a grinding wheel.
  • a tool 51 such as a grinding wheel.
  • feeler 1 as hereinafter better described, is placed close to a grinding machine for measurement of the diameter of the workpiece 40 .
  • this feeler can also be provided for other measurements such as axial measurements of a shoulder.
  • a measuring device 10 which comprises two feelers 1 and a measuring apparatus 11 electrically connected to the device 10 and in particular to feelers 1 .
  • the two feelers 1 in order to enable measurement of the diameter and circularity of the workpiece 40 , are substantially placed on opposite sides relative to the workpiece 40 and, more specifically, are arranged in such a manner as to feel the workpiece 40 at substantially diametrically opposite points.
  • Device 10 further comprises a supporting structure 14 adapted to support said feelers 1 and an actuating system 12 adapted to move the device 10 in a direction away from or towards the workpiece 40 , along suitable carriages not shown and external to device 10 .
  • Feeler 1 substantially comprises two base components: a rocking arm 20 adapted to feel the workpiece 40 , and a measuring head 30 adapted to carry out the necessary measurements on the workpiece 40 and brought into data connection with the measuring apparatus 11 through suitable cables 13 .
  • the rocking arm 20 substantially consists of a rod, possibly comprising a detachable joint 23 , oscillating around a hinge 21 rigidly connected to the measuring head 30 . It has a first end suitably placed inside the measuring head 30 and a second end adapted to feel the workpiece 40 .
  • the second end of the rocking arm 20 comprises a contact element 22 adapted to be put into direct contact with the workpiece 40 .
  • the contact element 22 consists of a pin the position of which is axially adjustable, and terminating with a ball, a cone or other similar element adapted to identify a contact surface between element 22 and workpiece 40 and preferably made of diamond or other material of high hardness.
  • the measuring head 30 conveniently comprises control means adapted to enable the positions of the rocking arms 20 to be evaluated and in connection with the measuring apparatus 11 .
  • this control means comprises a first sensor 31 adapted to produce a first measuring signal based on the position or displacement of the contact element 22 and at least one additional sensor 32 adapted to produce an additional measuring signal as a function of external perturbations acting on feeler 1 and in particular on arm 20 .
  • the general term “perturbations” is understood as indicating static or impulsive forces such as: an impact, force, pulse or acceleration from the outside and preferably having high speed or frequency, as compared with the movement speed of arms 20 while working.
  • the measuring head 30 further has a housing 33 adapted to receive at least the first sensor 31 inside it.
  • the first sensor 31 is suitable to detect the position of the rocking arm 20 in contact with the workpiece 40 during machining and therefore the machining state.
  • the first sensor 31 is adapted to generate a first signal, of the electric type, directly proportional to the displacement, and consequently the position, of the contact element 22 relative to housing 33 .
  • the additional sensor 32 is advantageously adapted to detect said impulsive perturbations.
  • it consists of a piezoelectric element, a piezoresistive sensor, an accelerometer or any sensor adapted to detect these vibrations and forces acting from the outside.
  • This additional sensor 32 is further adapted to also detect, during machining, displacements of arm 20 due to surface defects and roughness or any other perturbation characterised by particularly reduced duration or high variation speeds.
  • the additional sensor 32 can be positioned at different locations. In particular, as shown in FIG. 2 a , it can be positioned along the rocking arm 20 . Alternatively, as shown in FIG. 2 b , it is available externally of the measuring head 30 , directly in contact with the head 30 itself and the supporting structure 14 . In the last-mentioned case the additional sensor 32 is not directly in contact with arm 20 but, since hinge 21 only allows few movements, it succeeds in perceiving said perturbations just the same.
  • feeler 1 can be provided with an actuating mechanism adapted to enable the rocking arm 20 to be moved so as to define a work position in which the rocking arm is substantially adjacent to the workpiece 40 , and an open position in which the position of arm 20 relative to head 30 enables easy positioning or removal of the workpiece 40 from the machine 50 .
  • the measuring device 10 comprising feeler 1 previously described as regards its structure is used according to the following process.
  • This process first contemplates a calibration step, in which the position of feelers 1 is calibrated as a function of the diameter or size to be carried out on a certified sample. If subsequently or during this step, feeler 1 is accidentally subjected to an unexpected impulsive perturbation, the latter is detected by the additional sensor 32 , as hereinafter specified.
  • the step of machining the workpiece 40 begins and, simultaneously, measurement of the piece 40 occurs.
  • the grinding machine or machine tool 50 removes chips from the workpiece 40 .
  • Each of the two arms 20 based on the shape of the surface of the workpiece 40 , is moved and activates the first sensor 31 that will emit the measuring signal based on the position or displacement of the contact element 22 .
  • This first signal is transmitted through cables 13 , to the measuring apparatus 11 that is therefore able to evaluate whether the machining operation is correct and has come to an end and possibly operates stopping of tool 51 or moves it away.
  • feeler 1 detects the roughness or possible defects of the workpiece 40 and therefore evaluates the surface finish of the piece 40 itself.
  • the contact elements 22 being in contact with the workpiece surface follow the surface unevenness of the workpiece 40 and therefore generate oscillations on arm 20 that, due to the reduced sizes of the roughness and the rotation speed of the workpiece 40 , are characterised by a particularly high frequency that therefore can be detected by the additional transducers 32 .
  • the additional sensors 32 create at least one additional signal highlighted in the graph in FIG. 2 a and representing the surface roughness.
  • feelers 1 through the actuating system 12 , are moved to a distance from the workpiece 40 and the measuring process is completed.
  • the additional sensor 32 perceives this perturbation and sends this information to apparatus 11 though the additional signal.
  • apparatus 11 If the additional signal passes an acceptability threshold, apparatus 11 signals this drawback to the user. Then an intervention step is activated in which an evaluation is carried out on the state of at least one of feelers 1 present on device 10 .
  • this intervention step takes place when the additional transducer 32 , based on motion of the rocking arm 20 , produces an additional signal of width beyond a predetermined acceptability threshold, as shown in FIG. 2 b.
  • the measuring apparatus graphically reproduces these impulsive perturbations ( FIG. 2 ) enabling the operator to evaluate them.
  • the intervention step is carried out in which the operator makes an evaluation of the calibration step of feeler 1 and possibly carries out this step again.
  • the invention achieves important advantages.
  • a first advantage is represented by the fact that feeler 1 for workpieces 40 being machined enables possible problems resulting from an impact to be highlighted in a simple and quick manner.
  • feeler 1 due to the presence of the additional sensor 32 , is able to identify such an impact and evaluate the amount thereof and is therefore in a position to enable the operator to establish whether this impact may have caused modifications in the original calibration, positioning errors and even breaks of the rocking arm 20 .
  • Another advantage connected with the presence of the additional sensor 32 is represented by the possibility of measuring the relative roughness and surface finishing of the workpiece 40 .
  • a further advantage resides in that the additional sensor 32 , externally connected to heads 30 ( FIG. 1 b ), is usable and applicable to known and commercially available feelers too, without complicated or difficult modifications to the feelers themselves being required.
  • feeler 1 is simple and cheap.
  • feeler 1 can be interlocked with a control apparatus and not with a grinding wheel.
  • the two transducers 31 and 32 can consist of a single sensor adapted to detect both types of vibration.
US13/847,846 2012-03-22 2013-03-20 Feeler for workpieces being machined Abandoned US20130252513A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/292,839 US10591268B2 (en) 2012-03-22 2016-10-13 Feeler for workpieces being machined

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP12160797.2A EP2642242B1 (en) 2012-03-22 2012-03-22 Measuring device including feeler for workpieces
EP12160797.2 2012-03-22

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/292,839 Continuation US10591268B2 (en) 2012-03-22 2016-10-13 Feeler for workpieces being machined

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US20130252513A1 true US20130252513A1 (en) 2013-09-26

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US13/847,846 Abandoned US20130252513A1 (en) 2012-03-22 2013-03-20 Feeler for workpieces being machined
US15/292,839 Active 2033-11-05 US10591268B2 (en) 2012-03-22 2016-10-13 Feeler for workpieces being machined

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US15/292,839 Active 2033-11-05 US10591268B2 (en) 2012-03-22 2016-10-13 Feeler for workpieces being machined

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US (2) US20130252513A1 (es)
EP (1) EP2642242B1 (es)
CN (1) CN103322961B (es)
ES (1) ES2784149T3 (es)
IN (1) IN2013CH01242A (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9232693B2 (en) * 2014-05-08 2016-01-12 Deere & Company System and method for sensing and mapping stalk diameter
JP2017200722A (ja) * 2016-04-28 2017-11-09 株式会社ジェイテクト 研削盤システム

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CN103697847B (zh) * 2013-12-27 2016-05-04 南通威明精工机械有限公司 一种钢缆磨损检测器
CN104792292A (zh) * 2014-01-22 2015-07-22 珠海格力电器股份有限公司 贯流风叶检测工装
JP6361243B2 (ja) * 2014-04-07 2018-07-25 株式会社ジェイテクト 加工変質検出センサを備える工作機械
CN106440992B (zh) * 2016-08-31 2020-04-24 毕梅华 一种防止撞坏的百分表
CN108303017A (zh) * 2018-04-13 2018-07-20 昆明理工大学 一种电缆线径的测量装置和方法
US11051452B2 (en) * 2018-11-30 2021-07-06 Cnh Industrial America Llc Auto-cycling deck plates for an agricultural vehicle
EP4235089A1 (en) 2022-02-25 2023-08-30 Balance Systems S.r.L. Measuring device

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US3622287A (en) * 1969-06-26 1971-11-23 Toyoda Machine Works Ltd Numerically controlled grinding machine with a sizing device
US4279079A (en) * 1973-10-25 1981-07-21 Finike Italiana Marposs S.P.A. Direct feeling gage for the measurement of the sizes of moving workpieces, in particular for measurements with intermittent contact between the feeling means and the workpiece
US4807400A (en) * 1986-03-20 1989-02-28 Giustina International S.P.A. Measuring apparatus for grinding machines for cylinders with structural and surface checking devices
US4811524A (en) * 1986-03-20 1989-03-14 Giustina International S.P.A. Cylinder grinding machine with tracing and dimensional and surface checking
US6098452A (en) * 1997-10-17 2000-08-08 Tokyo Seimitsu Co., Ltd. Machine control gage system performing roughness and roundness measuring functions
US6546642B1 (en) * 1998-03-13 2003-04-15 Marposs Societa' Per Azioni Head, apparatus and method for the linear dimension checking of mechanical pieces
US6159074A (en) * 1999-01-07 2000-12-12 Kube; Samuel C. Caliper assembly for a grinding machine
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US6360450B1 (en) * 2000-04-27 2002-03-26 Control Gaging, Inc. Adjustable caliper
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9232693B2 (en) * 2014-05-08 2016-01-12 Deere & Company System and method for sensing and mapping stalk diameter
JP2017200722A (ja) * 2016-04-28 2017-11-09 株式会社ジェイテクト 研削盤システム

Also Published As

Publication number Publication date
US10591268B2 (en) 2020-03-17
IN2013CH01242A (es) 2015-08-14
EP2642242A1 (en) 2013-09-25
EP2642242B1 (en) 2020-01-08
CN103322961B (zh) 2018-05-25
ES2784149T3 (es) 2020-09-22
US20170030697A1 (en) 2017-02-02
CN103322961A (zh) 2013-09-25

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Owner name: BALANCE SYSTEM S.R.L., ITALY

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Effective date: 20130318

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Owner name: BALANCE SYSTEMS S.R.L., ITALY

Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE RECEIVING PARTY'S NAME PREVIOUSLY RECORDED AT REEL: 030054 FRAME: 0244. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT;ASSIGNOR:TRIONFETTI, GIANNI;REEL/FRAME:040350/0251

Effective date: 20130318

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