WO2002006762A1 - Appareil de verification des dimensions et/ou de la geometrie de pieces mecaniques ayant une symetrie de rotation - Google Patents

Appareil de verification des dimensions et/ou de la geometrie de pieces mecaniques ayant une symetrie de rotation Download PDF

Info

Publication number
WO2002006762A1
WO2002006762A1 PCT/EP2001/007794 EP0107794W WO0206762A1 WO 2002006762 A1 WO2002006762 A1 WO 2002006762A1 EP 0107794 W EP0107794 W EP 0107794W WO 0206762 A1 WO0206762 A1 WO 0206762A1
Authority
WO
WIPO (PCT)
Prior art keywords
piece
support
coupled
arms
axis
Prior art date
Application number
PCT/EP2001/007794
Other languages
English (en)
Inventor
Valerio Lazzari
Original Assignee
Marposs Società per Azioni
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 Marposs Società per Azioni filed Critical Marposs Società per Azioni
Publication of WO2002006762A1 publication Critical patent/WO2002006762A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/10—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring diameters
    • G01B21/12—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring diameters of objects while moving
    • 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
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/20—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring workpiece characteristics, e.g. contour, dimension, hardness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/0025—Measuring of vehicle parts
    • G01B5/0028—Brakes, brakeshoes, clutches
    • 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
    • G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
    • G01B7/282—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures for measuring roundness

Definitions

  • the present invention relates to an apparatus for the dimensional and/or geometrical checking of a mechanical piece, that defines at least a surface of rotation and an axis of symmetry of said surface, including a support structure with support and reference elements for supporting and positioning the piece to be checked, that define a longitudinal reference axis and reference surfaces for positioning the piece to be checked in such a way that the axis of symmetry and the longitudinal reference axis substantially coincide, driving devices coupled to the support structure, a transmission system, with a rotary support rotating about a longitudinal axis of rotation, coupled to the driving devices and adapted for cooperating with the piece for transmitting rotational displacements of the piece about the axis of symmetry, and checking devices, coupled to the support structure and adapted to cooperate with the piece to be checked.
  • Object of the present invention is to achieve an apparatus for the dimensional and/or geometrical checking of pieces with rotational symmetry that guarantees high standards of precision and reliability and can be utilized for the checking of pieces that have different features and nominal dimensions .
  • This and other objects are achieved by an apparatus according to claim 1.
  • Figure 1 is an axonometric view of an apparatus according to the invention
  • Figure 2 is an enlarged scale view of a portion of the apparatus shown in figure 1;
  • Figure 3 is a partly cut-away longitudinal cross- sectional view, furthermore enlarged and with the omission of some elements, of a part of the portion of the apparatus shown in figure 2.
  • the checking apparatus shown in the figures includes a support structure 1 with a stanchion 3 carrying two guides 5 to which there is coupled a slide 6, the slide 6 is movable along guides 5 and supports a base plate 9.
  • the position of slide 6 is controlled by mechanical microswitches 8.
  • Base plate 9 carries support and reference elements for supporting and positioning a piece 11 to be checked, for example a brake disk, that includes at least a surface of rotation 7 and defines an axis of symmetry of these surfaces.
  • These support and reference elements include a support element 13, with rotational symmetry, including three substantially cylindrical portions 15, 17 and 19 with different external diameter dimensions.
  • the support element 13 - coupled to base plate 9 by means of screws, not shown in the figure - has an axial through hole 10 that defines at one end a seat 12.
  • a substantially cylindrical element 16 is inserted in hole 10 and includes a flange housed in seat 12.
  • Element 16 that is coupled to the support element 13 by means of screws (not shown in the figure) , defines a cylindrical seat 21 in which there is housed a substantially tubular element 25 sealed at one end and a compression spring 23, partially arranged inside element 25.
  • the arrangement is provided in such a way that spring 23 applies a force for displacing the sealed end of tubular element 25 away from the bottom of seat 21.
  • the support and reference elements include a plate 31 and a centering nosepiece 33.
  • Plate 31 includes a central hole and a substantially annular relief rim 35 with an annulus-shaped plane surface 37 that has a coating of hard and wear-resistant material, for example ⁇ Widia".
  • Surface 37 defines a reference surface for the piece 11 to be checked.
  • Plate 31 is screwed to the second portion 17 of the support element 13 by means of screws.
  • the centering nosepiece 33 that is coupled to the substantially tubular element 25 by means of screws not shown in the figure, has a substantially frusto-conical surface 34 for centering and positioning piece 11 and rests, by means of the substantially tubular element 25, on spring 23 that enables limited axial translation displacements of nosepiece 33. These axial displacements are limited by surfaces of the support element 13 and of the substantially tubular element 25 and by the head of a screw 32 coupled to the substantially cylindrical element 16.
  • Nosepiece 33 and plate 31 define a longitudinal reference axis for piece 11.
  • a system for the automatic displacement of piece 11 includes a mechanic conveyor 39 of the known type for conveying piece 11 towards the interior of the apparatus and clearing it away when the checking operations have been carried out .
  • a transmission system for communicating to piece 11 a motion of rotation about the axis of symmetry comprises two arms 41, each including a first portion 41' and a second portion 41' ' , both substantially L-shaped, rigidly coupled to each other by means of screws.
  • the first portion 41' of each arm 41 carries at a free end thereof a jaw 43 with a clamping surface with a V-shaped cross-section for contacting the surface of rotation 7 of piece 11.
  • the coupling of each jaw 43 to its associated arm 41 includes screws and pins for enabling it to perform limited rotational displacements, relative to arm 41, about axes substantially parallel to the longitudinal reference axis and perpendicular to it, for facilitating the correct cooperation between the associated clamping surface and the surface 7 of piece 11.
  • the coupling can also include clearance in the longitudinal direction (at each shoulder screw identified by reference number 42 in figure 3) for compensating possible unwanted longitudinal displacements among the elements forming a coupling joint (an Oldham coupling 47 that is hereinafter described) , and compression springs for maintaining the mutual longitudinal arrangements between arms 41 and jaws 43 when the latter do not touch piece 11.
  • the second portion 41' ' of each arm 41 is coupled to a substantially C-shaped rotary support 45, by means of a fulcrum device including, for example, a hinge 44.
  • the hinges 44 enable each arm 41 to rotate, relative to the rotary support 45, about a transversal axis of rotation.
  • the rotary support 45 is coupled to driving devices that cause rotations about a longitudinal axis, as hereinafter described.
  • the driving devices include a pulley 49 fixed to a support plate 51 integral with stanchion 3, and a motor 53, controlled by an encoder 52, also fixed to support plate 51, and coupled to pulley 49 by means of belts 55.
  • a pulley 49 fixed to a support plate 51 integral with stanchion 3, and a motor 53, controlled by an encoder 52, also fixed to support plate 51, and coupled to pulley 49 by means of belts 55.
  • mutually movable parts of articulated coupling joint 47 for example, an Oldham coupling of a known type, are clamped, by means of screws, to pulley 49 and rotary support 45, respectively.
  • motor 53 causes rotations of pulley 49 that are transmitted to rotary support 45 by the Oldham coupling 47.
  • the Oldham coupling 47 does not substantially constrain the mutual position between pulley 49 and support 45 insofar as translations along directions that are parallel or perpendicular to said longitudinal reference axis are concerned, thus enabling the proper transmission of the rotation even when, for example, the axis of rotation of pulley 49 does not perfectly coincide with the longitudinal reference axis.
  • the use of coupling joint 47 enables to prevent the generating of unwanted stresses between pulley 49 and rotary support 45, in particular in planes perpendicular to the reference axis. Similar stresses could be transmitted - through arms 41 and jaws 43 - to piece 11 and thereby create problems of statical indeterminateness when defining the associated transversal reference position.
  • Thrust devices include two compression springs 57, each with an end housed in a seat 56 of rotary support 45 and the other end coupled to an adjustment screw 54 screwed in a threaded hole 58 of portion 41'' of arm 41.
  • the springs 57 operate on arms 41 so as to urge the clamping surfaces of jaws 43 against surface 7 of piece 11.
  • Retraction devices include two pneumatic cylinders 59, coupled to support plate 51, and associated pistons 60, each adapted to cooperate with abutment surfaces of portion 41'' for causing arm 41 to rotate about the transversal axis defined by its associated hinge 44 and jaw 43 to retract from piece 11, during the operations for the loading/unloading of piece 11.
  • Elements for limiting the rotations of arms 41 include, for each arm 41, a screw 62 screwed in a threaded hole of rotary support 45, with its head housed in a seat of the second portion 41'' of arm 41.
  • the abutment of the head of screw 62 with surfaces of the seat of portion 41' ' limits rotations of arm 41 when approaching piece 11.
  • monitoring means include two pairs of inductive proximity sensors 78 of a known type and two elements 80, each screwed to each arm 41 at portion 41''.
  • These elements 80 include suitably shaped surfaces that, together with the inductive proximity sensors 78, monitor the open or closure condition of arms 41.
  • the pneumatic cylinders 59 and the proximity sensors 78 for the two arms 41 are coupled to support plate 51 so as to be symmetrically arranged at diametrically opposite positions with respect to the longitudinal reference axis.
  • Dimensional checking devices of a known type are coupled to various portions of the support structure in order to perform different types of checkings in connection with different surfaces of piece 11.
  • the figure shows, as an example only, gauging heads 73 fixed to a support 75 coupled, by means of screws, to support plate 51.
  • Each head 73 includes a feeler 76, for contacting the surface to be checked of piece 11, and transducer means, of a known type and not shown in the figures, for emitting signals indicative of the displacements of feeler 76 relative to a zero position, defined in the course of a calibration phase.
  • the processing of these signals enables to determine dimensions and/or geometrical characteristics, for example diameters, distances, flatness, concentricity of different surfaces of piece 11.
  • Other heads 77 can be coupled, for example, to plate 31 for performing, in a known way, similar checkings, for example checkings relating to the flatness of a surface 71 of the brake disk 11 facing plate 31 and positioned on surface 37.
  • the operation of the apparatus is as follows: upon completion of a calibration phase of the apparatus against a master piece, the mechanical conveyor 39 carries piece 11 to a transversal position that substantially corresponds to the checking position, in other terms a position according to which the axis of symmetry of piece 11 is near the longitudinal reference axis.
  • Slide 6 that is in a lower position with respect to the one shown in figure 1, is raised, for example, by means of a suitable automatic mechanism of a known type not shown in figure 1, until nosepiece 33 is inserted in the central hole of piece 11, the reference surfaces 34 and 37 touch surfaces of piece 11, piece 11 detaches from conveyor 39 and a longitudinal checking position - pre-determined on the basis of the geometrical characteristics of the apparatus - is reached.
  • the reaching and the maintaining of said longitudinal position is controlled by microswitch 8.
  • the surfaces of plate 31 and of nosepiece 33 enable the positioning and the centering of piece 11 so that the axis of symmetry of piece 11 coincides with the longitudinal reference axis.
  • the angular position of rotary support 45 corresponds to the one shown in the figures, i.e. the arms 41 face cylinders 59 and proximity sensors 78. Furthermore, for enabling the insertion of piece 11, the retraction devices are activated and pistons 60 urge jaws 43 to mutually withdraw to an open configuration. The correct occurring of said open configuration can be controlled by the inductive proximity sensors 78 that are connected to known checking units not shown in the figure.
  • the retraction devices are deactivated and pistons 60 retract hence allowing the clamping surfaces of jaws 43 to be urged, by springs 23 and by virtue of the rotations of arms 41, against the surface 7 of piece 11.
  • motor 53 is activated and drives into rotation, by means of belt 55, pulley 49 and consequently rotary support 45, arms 41, jaws 43 and piece 11.
  • heads 73 and 77 provide signals that are transmitted to suitable processing units (known and not shown in the figure) for carrying out the required dimensional and/or geometrical checkings.
  • motor 53 is made to stop at a position according to which the angular position of rotary support 45 is such that arms 41 are aligned with pistons 60 and sensors 78, as shown in the figures.
  • the operation for stopping motor 53 is controlled by encoder 52.
  • the retraction devices are activated and pistons 60 operate on arms 41 thereby displacing jaws 43 away from piece 11.
  • slide 6 is lowered, until piece 11 contacts conveyor 39, detaches from reference surfaces 34 and 37 and is carried by conveyor 39 to the output of the apparatus towards the subsequent machining or checking station.
  • an apparatus according to the invention it is possible to perform accurate checkings with respect to the reference surfaces (34, 37) on which the piece rests.
  • head 77 coupled to plate 31, for checking the flatness of surface 71 of piece 11.
  • an apparatus according to the invention provides remarkable aspects of flexibility of use.
  • the mutual displacement between piece 11 and the support elements tends to eliminate possible foreign matter, as for example machining swarf, on plate 31 that could affect in a negative way the measurement results.
  • An apparatus according to the invention can be achieved according to embodiments that differ under some aspects from what is herein illustrated and disclosed, for example it can be utilized for checking pieces of another type, as shafts.
  • the piece can be horizontally arranged between stationary centers and driven into rotation by means of two or three arms coupled to a support and carrying jaws clamped to a surface of rotation of the piece.
  • the support for the arms can be coupled to driving devices including a motor through a coupling joint, for example an Oldham coupling or a coupling of another type with similar features.
  • an apparatus can include that the driving devices and the transmission system (and possibly the checking devices) lower on the piece to be checked by means of a suitable slide, and not vice versa.
  • the checking devices there can be utilized other types of known comparators or measuring devices, with feelers or of the contactless type (for example of the optical type) .
  • the non-dimensional checking for example for detecting surface features of the piece to be checked.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Crushing And Pulverization Processes (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Abstract

La présente invention concerne un appareil utilisé pour vérifier les dimensions et/ou la géométrie de pièces mécaniques (11) ayant une symétrie de rotation qui comprend une structure de support (1, 3) constituée d'éléments de support et de référence (13, 16, 25, 31, 33), prévus pour supporter et positionner la pièce qui définissent un axe de référence longitudinal et des têtes de jaugeage (73, 77). Pour vérifier la pièce alors que cette dernière tourne, on a prévu un système de transmission comprenant un support rotatif axial (45) auquel sont couplés, par des charnières (44), deux bras (41) portant des mâchoires (43) destinées à serrer la pièce. Une poulie (49), fixée à la structure de support et entraînée à tourner par un moteur (53) transmet la rotation axiale au support comprenant les bras au moyen d'une liaison comprenant un joint d'Oldham (47).
PCT/EP2001/007794 2000-07-14 2001-07-06 Appareil de verification des dimensions et/ou de la geometrie de pieces mecaniques ayant une symetrie de rotation WO2002006762A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO00A000427 2000-07-14
IT2000BO000427A ITBO20000427A1 (it) 2000-07-14 2000-07-14 Apparecchiatura per il controllo dimensionale e/o geometrico di pezzimeccanici a simmetria di rotazione .

Publications (1)

Publication Number Publication Date
WO2002006762A1 true WO2002006762A1 (fr) 2002-01-24

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PCT/EP2001/007794 WO2002006762A1 (fr) 2000-07-14 2001-07-06 Appareil de verification des dimensions et/ou de la geometrie de pieces mecaniques ayant une symetrie de rotation

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IT (1) ITBO20000427A1 (fr)
WO (1) WO2002006762A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2965046A1 (fr) * 2010-09-16 2012-03-23 Nat De Metrologie Et D Essais Lab Dispositif et procede de mesure de caracteristiques geometriques
CN103743321A (zh) * 2013-11-21 2014-04-23 江苏太平洋液压机械制造有限公司 一种改进的螺母收口槽深尺寸检测装置
IT201600105481A1 (it) * 2016-10-20 2018-04-20 Marposs Spa Stazione di controllo per il controllo di un pezzo meccanico a simmetria di rotazione
IT201800009732A1 (it) * 2018-10-24 2020-04-24 Marposs Societa' Per Azioni Stazione di controllo e relativo metodo per il controllo di un pezzo meccanico a simmetria di rotazione

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125811A (en) * 1964-03-24 Machine for measuring roundness
US3231979A (en) * 1958-07-11 1966-02-01 Perthen Johannes Electrical methods and devices for testing the surface formation and errors of shape of workpieces
US4389787A (en) * 1980-05-16 1983-06-28 Finike Italiana Marposs S.P.A. Gauge for the geometrical and/or dimensional checking of pieces rotating about a geometrical axis
GB2159276A (en) * 1984-05-25 1985-11-27 Teves Gmbh Alfred Receiving device for a brake disc
GB2189604A (en) * 1986-03-04 1987-10-28 Rank Taylor Hobson Ltd Workpiece position control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125811A (en) * 1964-03-24 Machine for measuring roundness
US3231979A (en) * 1958-07-11 1966-02-01 Perthen Johannes Electrical methods and devices for testing the surface formation and errors of shape of workpieces
US4389787A (en) * 1980-05-16 1983-06-28 Finike Italiana Marposs S.P.A. Gauge for the geometrical and/or dimensional checking of pieces rotating about a geometrical axis
GB2159276A (en) * 1984-05-25 1985-11-27 Teves Gmbh Alfred Receiving device for a brake disc
GB2189604A (en) * 1986-03-04 1987-10-28 Rank Taylor Hobson Ltd Workpiece position control

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2965046A1 (fr) * 2010-09-16 2012-03-23 Nat De Metrologie Et D Essais Lab Dispositif et procede de mesure de caracteristiques geometriques
CN103743321A (zh) * 2013-11-21 2014-04-23 江苏太平洋液压机械制造有限公司 一种改进的螺母收口槽深尺寸检测装置
IT201600105481A1 (it) * 2016-10-20 2018-04-20 Marposs Spa Stazione di controllo per il controllo di un pezzo meccanico a simmetria di rotazione
IT201800009732A1 (it) * 2018-10-24 2020-04-24 Marposs Societa' Per Azioni Stazione di controllo e relativo metodo per il controllo di un pezzo meccanico a simmetria di rotazione

Also Published As

Publication number Publication date
ITBO20000427A0 (it) 2000-07-14
ITBO20000427A1 (it) 2002-01-14

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