WO2011003944A1 - Dispositif de contrôle, système modulaire et dispositif d'appui relatif - Google Patents

Dispositif de contrôle, système modulaire et dispositif d'appui relatif Download PDF

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Publication number
WO2011003944A1
WO2011003944A1 PCT/EP2010/059739 EP2010059739W WO2011003944A1 WO 2011003944 A1 WO2011003944 A1 WO 2011003944A1 EP 2010059739 W EP2010059739 W EP 2010059739W WO 2011003944 A1 WO2011003944 A1 WO 2011003944A1
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WO
WIPO (PCT)
Prior art keywords
plate
seat
fulcrum device
fulcrum
feeler
Prior art date
Application number
PCT/EP2010/059739
Other languages
English (en)
Inventor
Guido Golinelli
Original Assignee
Marposs Societa' 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
Priority claimed from ITBO2009A000615A external-priority patent/IT1399152B1/it
Application filed by Marposs Societa' Per Azioni filed Critical Marposs Societa' Per Azioni
Publication of WO2011003944A1 publication Critical patent/WO2011003944A1/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
    • 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
    • G01B7/004—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring coordinates of points
    • G01B7/008—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring coordinates of points using coordinate measuring machines
    • G01B7/012—Contact-making feeler heads therefor
    • 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
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
    • G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports

Definitions

  • the present invention relates to a fulcrum device adapted to be fastened between a bearing frame and a feeler of a checking device for checking dimensions and/or form deviations, to enable displacements of the feeler with respect to the bearing frame, the fulcrum device including a deformable section that defines a rotation axis and two portions lying on opposite sides with respect to the deformable section.
  • the invention also relates to a checking device for checking dimensions and/or form deviations of a mechanical piece, including a bearing frame, a feeler movable with respect to the bearing frame and adapted to touch the mechanical piece to be checked, and a fulcrum device.
  • the invention also relates to a modular system for implementing a checking device, including different separate components with a feeler support, transducer means and a fulcrum device, wherein the fulcrum device defines at least one rotation axis, comprises two portions lying on opposite sides with respect to the rotation axis, and is adapted to be connected to the feeler support and to a bearing frame for enabling mutual displacements between the feeler support and the bearing frame.
  • Checking devices and gauging heads for checking dimensions and/or form deviations of pieces have been known and employed for a long time, for example, in the mechanical industry for checking dimensions and/or form deviations of mechanical pieces before, during and after the machining process in grinding machines.
  • the disclosed devices are obtained by assembling to a bearing frame different components, among which at least one feeler for touching the piece to be checked, at least one fulcrum enabling the feeler to perform limited displacements with respect to the bearing frame, and at least one transducer converting movements of the feeler - or the feelers - into electrical signals that are subsequently processed in suitable units. Assembling the different parts is a time consuming operation and needs ability especially to correctly position and securely fix the transducer with respect to the fulcrum, the feeler and the other components.
  • Object of the present invention is to simplify the assemblage of a checking device by limiting the numbers of components, while assuring that the obtained device is reliable and that such components can be used in a very flexible and modular way.
  • a fulcrum device includes a rotation axis, preferably defined by a deformable section that is obtained by a localized reduction in thickness.
  • the fulcrum device has an integrated transducer, for example a strain gauge.
  • the transducer is preferably arranged in a seat that is positioned at the rotation axis, i.e. in correspondence of the rotation axis.
  • the fulcrum device can be substantially flat with two opposite main faces, and can comprise two integrated transducers arranged in respective seats that are symmetrically positioned on the two opposite faces.
  • the fulcrum device with seat/-s and deformable section/-s can be obtained by machining a single piece of metal or other material such as carbon fibre.
  • the fulcrum device according to the invention is obtained by fastening two shaped stiff parts to one or both faces of a flexible laminate element made of spring steel or other material such as carbon fibre.
  • Such stiff parts define the two mutually movable portions and delimit the deformable section, and thus define the rotation axis and, at least partly, the seat (or the seats positioned on opposite sides) where placing the transducer/-s .
  • each seat with the respective transducer is closed by a suitable protection system, for example a bellows or a rubber gasket.
  • the protection system can be made by filling the seat with suitable insulating material, such as silicone, so as to obtain a substantially sealingly closed system.
  • suitable insulating material such as silicone
  • the protection system can include an additional carbon fibre part which is glued at the entrance of the seat for achieving a sealing closure.
  • Another preferred solution for a protection system enabling a sealing protection employs a few micron metal sheet (for example a steel sheet) that covers the entrance to the seat where the strain gauge is housed, and is fastened by laser welding.
  • the fulcrum device can include at least one integrated element for mechanically limiting the movements between the two portions.
  • a checking device and a corresponding modular system according to the invention include one or more fulcrum devices having the above mentioned characteristics. - A -
  • the characteristics of the fulcrum device with the integrated transducer means ensure a great flexibility in use.
  • the same fulcrum devices can be used in a wide range of checking devices, such as gauging or measuring heads or other applications, by performing simple assembling operations that simplify their construction.
  • figure 1 is a simplified perspective view of a checking device according to the invention
  • FIG. 2 is a perspective view of a fulcrum device according to an embodiment of the present invention.
  • figure 3 is an exploded perspective view of a fulcrum device according to a different preferred embodiment of the invention.
  • figure 4 is a perspective view of the fulcrum device of figure 3;
  • figure 5 is a longitudinal central cross-section - on a different scale - of the fulcrum device of figures 3 and
  • FIG. 6 is an exploded perspective view of a fulcrum device according to an embodiment that is similar to the one of figures 3 to 5 but includes a different protection system;
  • figure 7 is a perspective view of the fulcrum device of figure 6;
  • figure 8 is a longitudinal central cross-section - on a different scale - of the fulcrum device of figures 6 and
  • figure 9 is an exploded perspective view of a fulcrum device according to a further different embodiment.
  • figure 10 is a perspective view of the fulcrum device of figure 9;
  • figure 11 is a longitudinal central cross-section - on a different scale - of the fulcrum device of figures 9 and 10, taken along the line XI-XI of figure 10;
  • FIGS. 12A, 12B and 12C are perspective views of a fulcrum device according to a possible different embodiment of the invention that relate to different steps of its construction;
  • figure 13A is a side view of a fulcrum device including an integrated, mechanical limiting device
  • FIG. 13B and 13C are perspective views of the fulcrum device of figure 13A, taken along the directions XIIIB and XIIIC of figure 13A, respectively;
  • figure 14 is a simplified perspective view of a checking device according to a different embodiment of the invention.
  • FIGS. 15A and 15B are simplified perspective views of a checking device according to a further embodiment of the invention.
  • figure 16A is a simplified perspective view of a different checking device according to the invention
  • figure 16B is a side view of the device of figure 16A, taken along the direction XVIB of figure 16A
  • figure 17 is a perspective view of a fulcrum device according to a further embodiment of the invention.
  • FIG. 1 shows, in a very simplified way and with many components removed for the sake of simplicity, a checking device 1, for example a gauging or measuring head, with a bearing frame 2, which includes a base 3 and a stanchion 4, a movable feeler support 6, more specifically an elongated arm, and a feeler 8 that is fastened to an end of the arm 6 and is aimed to touch the surface of a mechanical piece - not shown in the figure - whose dimensions and/or shape have to be checked.
  • a checking device for example a gauging or measuring head
  • a bearing frame 2 which includes a base 3 and a stanchion 4, a movable feeler support 6, more specifically an elongated arm, and a feeler 8 that is fastened to an end of the arm 6 and is aimed to touch the surface of a mechanical piece - not shown in the figure - whose dimensions and/or shape have to be checked.
  • the feeler 8 - via the movable feeler-support or the arm 6 - is connected to the base 3 of the bearing frame 2 by means of a fulcrum device with a substantially flat element or plate 10 that has two main opposite faces, a thinned cross-section portion 11 defining a deformable section, and two end portions 12 and 13.
  • the thinned cross-section portion 11 is deformable and enables the end portion 12, and thus the arm 6 connected thereto, to perform displacements with respect to the end portion 13, that is to the bearing frame 2 with the base 3.
  • the feeler 8 contacts the surface of the mechanical piece 5
  • reduced mutual rotations about the rotation axis R are enabled between the arm 6 and the bearing frame 2.
  • Elements 15 for mechanically limiting said mutual rotations of pre-travel and overtravel are fastened to the stanchion 4 and are adapted to cooperate with the arm 6 in a per se known way.
  • Transducer means are integrated into the plate 10 of the fulcrum device. More specifically, the plate 10 includes a seat 18 lying on the main face opposite to the face that have been machined to obtain the thinned cross-section portion 11, and housing integrated transducer means. According to a preferred embodiment (see also figure 2) the seat 18 is transversal to the rotation axis R, i.e. it features a main dimension, substantially larger than the others, arranged substantially along a direction that is transversal (i.e. perpendicular) with respect to the rotation axis R. Transducer means include a strain gauge 20 that is arranged in said seat 18 and is fastened to the plate 10, for example glued, at the thinned cross-section portion 11. The seat 18 is substantially sealingly closed by means of a protection system with a closure element 19, for example a steel sheet fixed by laser welding. It should be noted that in figure 1, the seat 18 is actually covered by the sheet 19, while the strain gauge 20 is shown in dashed line.
  • the strain gauge 20 for example a resistive strain gauge, is electrically connected by means of electrical conductors, schematically presented in the figure and depicted by the wires 22, to a feeding, processing and display unit, which is not shown in the figure.
  • the strain gauge 20 can be implemented in a know way, for example by using a grid of thin wire, or by means of a sheet or sheets of semiconductor material, such as silicon. This second solution provides remarkable advantages: the sensitivity is improved, and the overall dimensions and costs are noticeably reduced.
  • the checking device can be obtained by assembling to the bearing frame 2 two essential components of a modular system according to the present invention, namely the movable feeler support or arm 6 with the feeler 8 and the fulcrum device with the plate 10 and the integrated transducer means 20. More specifically, it is the availability of the latter component that makes the modular system particularly flexible and the checking devices that can be obtained absolutely reliable.
  • the operation of the head 1 is per se known and only briefly mentioned here.
  • the feeler 8 touches a surface of the mechanical piece 5, the plate 10, and in particular the deformable, thinned cross-section portion 11 enables the arm 6 to displace with respect to the base 3 by performing limited rotations (in a substantially clockwise direction with reference to figure 1) about the rotation axis R.
  • Such rotations are detected in the feeding, processing and display unit that receives from the strain gauge 20 signals indicative of the consequent deformation.
  • the plate 10 includes both the fulcrum function, namely the connection of the movable feeler support 6 to the bearing frame 2 that enables the feeler 8 to displace by performing rotations about a definite rotation axis R, and the transducing function consisting in the transduction of said displacements into electrical signals or variations of electrical signals.
  • Figure 2 shows a plate 30, with a deformable, thinned cross-section portion 31, that forms a fulcrum device with an integrated strain gauge according to a different variant.
  • the plate 30 does not have the holes for the fastening by screws.
  • the fastening to the bearing frame 2 and to the movable feeler support 6 can be implemented in a substantially permanent way, for example by laser welding.
  • the closure element 19 is not shown, while the seat 18 wherein the strain gauge 20 is arranged and a passage or opening 17 for enabling the wires 22 to pass through are visible.
  • Figures 3 to 5 refers to a different embodiment of a fulcrum device according to the invention, in particular a plate 40 including several components among which a flexible laminate element 44 - for example made of spring steel with a thickness of one or few tenths of millimeter - defining two mutually opposite faces and substantially rigid, shaped, flat elements connected to one or both the faces of the laminate element 44 so as to delimit, as it will be hereinafter described, both the deformable section of the fulcrum device and the seat (or the seats) housing the transducer means. More specifically, couples of first shaped flat elements 46 and 56 and of second shaped flat elements 47 and 57, substantially stiff, are each connected to the laminate element 44 at end portions 42 and 43, respectively.
  • a flexible laminate element 44 for example made of spring steel with a thickness of one or few tenths of millimeter - defining two mutually opposite faces and substantially rigid, shaped, flat elements connected to one or both the faces of the laminate element 44 so as to delimit, as it will be
  • each couple 46, 56 and 47, 57 are fastened to the two opposite faces of the laminate element 44, and, on each face, parts of the shortest sides of the first shaped flat element 46 (56) and of the second shaped flat element 47 (57) are arranged in such a way that they are parallel to each other and lie to a suitable distance, for example some hundredths of millimeter or more.
  • a thinned cross-section portion 41 of the plate 40 is delimited and the position of the rotation axis R is defined at a deformable section wherein the thickness of the plate 40 corresponds to the thickness of the flexible laminate element 44.
  • the first shaped flat element 46 (56) and the second shaped flat element 47 (57) that lie side by side on each face of the laminate element 44 have opposite openings delimiting a seat 48 (and, on the other face, an additional seat 58) , and the transducer means include, for example, a couple of strain gauges 20 (one of them is visible in figure 3, while both are visible in figure 5) that are each fastened, for instance glued, to one face of the laminate element 44 at the seats 48 and 58.
  • the shaped flat elements 46, 47, 56 and 57 for example made of steel, are fastened to the faces of the laminate element 44 in a permanent way, for instance by laser welding.
  • FIGS. 3 to 5 show closure elements 49 and 59 consisting in spring steel sheets that are fastened, for example by laser welding, to respective first shaped flat elements 46, 56 and second shaped flat elements 47, 57.
  • Each of the second shaped flat elements 47, 57 has a groove, marked with reference number 45 and 55 respectively, at the side that is joint to the laminate element 44, while the laminate element 44 has an opening 52 placed in such a position that it defines, together with the grooves 45 and 55, a passage for the electrical connection wires 22 of the strain gauges 20.
  • the end portions 42 and 43 are aimed to be connected to a bearing frame and to a feeler or a feeler support such as a movable arm, for example by laser welding or other fastening systems.
  • fastening elements, integral with the end portions 42 and 43 that have holes for screws and have per se known characteristics herein not described or illustrated for the sake of simplicity.
  • a fulcrum device still falling within the scope of the present invention can differ with respect to the one of figures 3 to 5 in that the plate is composed of the flexible laminate element 44 with just one first shaped flat element 46 and just one second shaped flat element 47 that are fastened to just one face of the former.
  • a single strain gauge 20 can be arranged in the seat 48, the latter being closed by a single closure element 49.
  • the embodiment of figures 3 to 5 is particularly advantageous because the presence of the two strain gauges 20 on the opposite faces of the flexible laminate element 44 enables to simply and effectively compensate thermal drift effects due to temperature variations affecting the area where both the strain gauges 20 operates.
  • the use of the two strain gauges 20 allows to increase the sensitivity and the linearity of the response of the transducer means 20 to mutual movements between the two end portions 42 and 43, as it has been experimentally proved.
  • the width of the thinned cross-section portion 41 defined by the distance between the first shaped flat elements 46, 56 and the second shaped flat elements 47, 57 can range, as previously stated, between dimensions of few hundredths of millimeter, for obtaining a particularly precise definition of the rotation axis R, and greater dimensions such as some tenths of millimeter that can correspond to the length of the strain gauges 20, for exploiting the deformation effects of the strain gauges 20 better and increasing the measuring range.
  • the surfaces of the shortest sides of the first shaped flat elements 46, 56 and the second shaped flat elements 47, 57 that face each other and correspond to the respective thicknesses also define abutment surfaces adapted to cooperate with each other for limiting the mutual rotation movements between the end portions 42 and 43 about the rotation axis R defined by the deformable section at the thinned cross-section portion 41.
  • the closure elements 49 and 59 can be realized in a different way, for example by means of glued rubber gaskets, or can be omitted.
  • the protection system also can be realized in a different way, for example by filling the seats 48 and 58 with suitable insulating material such as silicone .
  • Figures 6 to 8 show a fulcrum device with a plate 60 that is very similar to the plate 40 of the previous figures, and thus the description of the different parts is not repeated.
  • the protection system includes a bellows 69, for example made of rubber, which substantially embraces and sealingly closes all the other components of the plate 60 at the thinned cross-section portion and the seats housing the strain gauges 20.
  • the fulcrum device of figures 9 to 11 consists of a plate 70 including a central laminate element 74 whose flexibility features are similar, for example, to those of the element 44 of figures 3 to 5.
  • Opposite seats 78, 88 housing a couple of strain gauges 20 are placed on the two faces of the central laminate element 74, while a passage or hole 75 enables the wires 22 of the two strain gauges 20 to pass through.
  • a protection system for getting a sealing closure includes two closure elements formed by steel sheets 79, 89 that have a thickness of few microns and are fastened to the faces of the central laminate elements 74, for instance by laser welding. This enables to achieve a substantially sealing closure of the seats 78, 88.
  • the plate 70 itself has not thinned cross-section portions.
  • a deformable section 71 defining the rotation axis R is delimited, while assembling the checking device, by the fastening (for example by laser welding) of the plate 70 to connection elements for the connection to a stationary part and a movable part, such as the bearing frame 2 and the arm 6 of figure 1.
  • the fastening portion of such connection elements - whose outlines 72 and 76 are shown in figure 11 in a very simplified way - and the mutual distance define and delimit the deformable section in an analogous way to what is obtained in the plate 40 of figures 3 to 5 by fastening the shaped flat elements 46, 47 (and/or 56, 57) to the laminate element 44.
  • Figures 12A, 12B and 12C show three different steps of the construction of a further embodiment of a fulcrum device according to the invention with a plate 90, mostly similar to the plate 10 that is visible in figure 1, with a thinned cross-section portion 91 that is obtained by machining one of the two main faces.
  • a thin framing border 94 delimits a seat 98 housing the strain gauge 20.
  • the framing border 94 preferably made of spring steel, is fastened, for example by laser welding, to the surface of the main face of the plate 90 opposite to the face that has been machined for obtaining the thinned cross-section portion 91.
  • the strain gauge 20 is arranged at the deformable thinned cross- section portion 91 and is connected by means of the conductors 22 - which pass through a passage defined by a gap in the framing border 94 - to terminals 95 for implementing the electric connection to a feeding, processing and display unit of the checking device wherein the plate 90 is used.
  • the seat 98 is substantially sealingly closed by means of a closure element 99, that is preferably made of spring steel, too, and is fastened to the framing border 94 by laser welding.
  • the use of the fulcrum device with the plate 90 is mostly similar to the use of the plates shown in the previous figures, and it is no longer described.
  • Figures 13A, 13B and 13C show a fulcrum device with a plate 1310 including two end portions 1312, 1313 and a thinned cross-section portion 1311 that defines the rotation axis R.
  • a strain gauge 1320 is fastened at the rotation axis R.
  • Plate 1310 may include a seat housing the strain gauge 1320 and a closure plate closing the seat, as shown in the previous drawings. No seats and closure plates are shown in figures 13A, 13B and 13C, as well as in figure 14, just for the sake of clarity.
  • An integrated mechanical limiting device comprises shaped limiting elements 1331, that are fastened, for example welded, to one (1312) of the two end portions 1312 and 1313 and include free abutment surfaces 1317 aimed to touch the other (1313) of the two end portions for limiting its mutual rotational movements about the axis R.
  • the face of the plate 1310 wherein the strain gauge 1320 is integrally connected has two limiting elements 1331 placed one alongside the other, whereas the opposite face of the plate 1310 has just one limiting element 1331.
  • different configurations or arrangements are possible, including, for example, just one integrated limiting element, for limiting deformations of the plate 1310 and the consequent rotations between the end portions 1312 and 1313.
  • Plates 1310 with strain gauges 1320 and limiting elements 1331 can be used in checking systems of different type.
  • figure 14 shows a checking device 1401 that is conceptually similar to the checking device of figure 1, wherein a feeler support or arm 1406 carrying a feeler 1408 is fastened to the fulcrum device, in particular to the end portion 1312 of the plate 1310.
  • the fulcrum device with the plate 1310 and the strain gauge 1320 (the latter is not visible in figure 14 but it is obviously present) is connected to a bearing frame that is, in this case, just a base 1403.
  • a bearing frame with a stanchion similar to the stanchion 4 of figure 1 is not needed, because there are the shaped limiting elements 1331 that limit the mutual movements of pre-travel and overtravel between the end portions 1312 and 1313 and thus between the feeler support 1406 and the base 1403.
  • Figures 15A and 15B show a checking device 1501 wherein, with respect to the checking device 1401 of figure 14, the arm 1406 is substituted by a feeler support 1506 of very small dimensions that carries a feeler 1508.
  • a fulcrum device with an integrated strain gauge 1520 has a plate 1510 that differs from the above described plate 1310 in that it includes a hole 1500, through which the feeler 1508 can pass, in the portion 1512 connected to the feeler support 1506.
  • the dimensions and the connection of the feeler support 1506 are such that its overall dimensions don't substantially exceed those of the plate 1510.
  • the checking device 1501 is particularly suitable for applications that requires to carry out dimensional and form deviation checks within a restricted space.
  • Plate 1510 too, may include a seat housing the strain gauge 1520 and a closure plate closing the seat, as shown in the previous drawings. No seats and closure plates are shown in figures 15A and 135, just for the sake of clarity.
  • Figures 16A and 16B refer to a checking device 1601 according to a more different application of fulcrum devices with an integrated strain gauge as the ones herein so far described.
  • the checking device 1601 has a feeler support or arm 1606 that carries a feeler 1608 and is connected to a bearing frame with a base 1603 by means of a yielding structure 1609 including three plates that are similar or identical to the one of figures 13A-13C and thus marked with reference number 1310, and are connected in series, either directly to one another or, as shown in the illustrated example, by placing between them two stiff elements 1619.
  • the yielding structure 1609 includes several thinned cross-section portions 1311 defining several rotation axes arranged in series - in the illustrated example there are three rotations axes (Rl, R2 and R3) - and includes strain gauges 1320 arranged at such rotation axes Rl, R2 and R3, and limiting elements 1331 for limiting the deformations of the single plates 1310.
  • a suitable processing unit per se known and not shown
  • the checking device 1601 can comprise a yielding structure 1609 with a different number of rotation axes arranged in series, for example two, or four, or more.
  • the yielding structure 1609 can include a single fulcrum device, in particular a flat element with two or more thinned cross-section portions that define respective rotation axes lying parallel to each other, or several flat elements arranged in series where at least one of said flat elements defines two or more rotation axes.
  • a checking device that has a configuration analogous to the one of figures 16A and 16B can be achieved even by using fulcrum devices identical or similar to those of figures 2 to 12, even though the presence of integrated limiting elements 1331 in the plates 1310 provides remarkable advantages in terms of design and construction simplicity of the checking device.
  • Fulcrum devices similar to the above described plates 10, 30, 40, 60, 70, 90, 1310, 1510 can be manufactured with components made of carbon fibre or other material.
  • Figure 17 shows, for example, a carbon fibre plate 100 forming a fulcrum device according to the invention. There are no substantial differences between the plate 100 and, for example, the plate 10 of figure 1 or the plate 30 of figure 2, except that the thickness is larger owing to a different coefficient of elasticity of the material.
  • a strain gauge is fastened to the plate 100 at the seat placed on its main lower face with reference to the orientation of figure 17.
  • strain gauge, the seat and an associated, substantially sealing, protection system are not visible in figure 17 but they are realized in a substantially identical way to what is shown in figures 1 and 2, except for constructive details and the possibility to employ different protection systems, featuring, for instance, closure elements that are made of the same material as the plate 100 (carbon fibre) to which they are glued or otherwise fixed for obtaining the seal.
  • a checking device and a relative modular system according to the invention can include components that differ from those illustrated and described in figure 1 and in figures 2 to 12 concerning the fulcrum device.
  • the transducer means 20 can be integrated into the fulcrum device in many ways, including the above mentioned gluing, mechanical locking or clamping systems, known deposition, printing or pressing methods, choice of particular materials and/or machining types that enable the deformable section itself of the fulcrum device - for example made of carbon fibre - to detect and signal variations of resistance or other electrical quantities by means of suitable connections, and other ways.
  • materials requiring particular machining processes are used, it is also possible to include, during such machining processes, the transducer means 20 into the fulcrum device.
  • the transducer means 20 into the already mentioned carbon fibres during the deposition of the fibres.
  • Fulcrum devices with two opposite strain gauges such as those of figures 5 and 8 can also be obtained with different structures. For instance, plates similar to those of figures 1 and 2 can be machined from solid.
  • Checking devices according to the invention can have shapes, dimensions and/or configurations that are very different from each other.
  • the feeler support can be integrated into the fulcrum device, and thus the feeler can be directly fastened to one of the end portions, and the bearing frame to which the fulcrum device is connected can be outside the checking device.

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  • General Physics & Mathematics (AREA)
  • Measurement Of Force In General (AREA)

Abstract

L'invention porte sur un dispositif d'appui pour relier de façon mobile – dans un dispositif de contrôle, tel qu'une tête de calibrage ou de mesure (1) – un palpeur (8) à un cadre de support (2), lequel dispositif d'appui comprend une plaque (10, 30) ayant une section déformable et un transducteur intégré, par exemple un extensomètre (20). Le transducteur intégré est fixé dans un siège (18) de la plaque, et un système de protection pour le transducteur comporte, par exemple, une plaque de fermeture (18) fermant le siège. La plaque peut être réalisée en acier, et la plaque de fermeture peut être une tôle d'acier fixée à la plaque par soudage par laser. L'invention porte également sur un dispositif de contrôle et sur un système modulaire comprenant un tel dispositif d'appui.
PCT/EP2010/059739 2009-07-10 2010-07-07 Dispositif de contrôle, système modulaire et dispositif d'appui relatif WO2011003944A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
ITBO2009A000445 2009-07-10
ITBO2009A000444 2009-07-10
ITBO20090444 2009-07-10
ITBO20090445 2009-07-10
ITBO2009A000615 2009-09-25
ITBO2009A000615A IT1399152B1 (it) 2009-09-25 2009-09-25 Dispositivo di controllo e relativo dispositivo a fulcro

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WO2011003944A1 true WO2011003944A1 (fr) 2011-01-13

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1469644A (en) * 1975-01-17 1977-04-06 Welwyn Electric Ltd Transducers
GB2079460A (en) * 1980-06-04 1982-01-20 British Steel Corp Caliper gauges
US4385444A (en) 1980-06-02 1983-05-31 Finike Italiana Marposs, S.P.A. Plug comparator for checking the diameter of holes
US4409737A (en) 1980-07-25 1983-10-18 Finike Italiana Marposs S.P.A. Gauging head for checking linear dimensions of mechanical pieces
US4555855A (en) 1982-09-09 1985-12-03 Finike Italiana Marposs S.P.A. Electronic gauge with at least one movable arm and a retraction device
US4597184A (en) 1983-09-07 1986-07-01 Finike Italiana Marposs S.P.A. Snap gauge for checking dimensions of workpieces
EP0312761A1 (fr) * 1987-10-09 1989-04-26 Marposs Societa' Per Azioni Appareil pour contrôler les dimensions linéaires de pièces
US5083384A (en) * 1987-10-09 1992-01-28 Marposs Societa' Per Azioni Device for checking linear dimensions of parts
JPH06221806A (ja) * 1992-12-03 1994-08-12 Mitsutoyo Corp タッチ信号プローブ
US6269546B1 (en) 1996-11-07 2001-08-07 Marposs Societa Per Azioni Head for the linear dimension checking of mechanical pieces
EP1152209A2 (fr) * 2000-05-01 2001-11-07 Mitutoyo Corporation Palpeur de mesure de forme et instrument de mesure de forme
WO2006037749A1 (fr) * 2004-10-01 2006-04-13 Marposs Societa' Per Azioni Appareil de controle dimensionnel et/ou geometrique de pieces mecaniques

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1469644A (en) * 1975-01-17 1977-04-06 Welwyn Electric Ltd Transducers
US4385444A (en) 1980-06-02 1983-05-31 Finike Italiana Marposs, S.P.A. Plug comparator for checking the diameter of holes
GB2079460A (en) * 1980-06-04 1982-01-20 British Steel Corp Caliper gauges
US4409737A (en) 1980-07-25 1983-10-18 Finike Italiana Marposs S.P.A. Gauging head for checking linear dimensions of mechanical pieces
US4555855A (en) 1982-09-09 1985-12-03 Finike Italiana Marposs S.P.A. Electronic gauge with at least one movable arm and a retraction device
US4597184A (en) 1983-09-07 1986-07-01 Finike Italiana Marposs S.P.A. Snap gauge for checking dimensions of workpieces
EP0312761A1 (fr) * 1987-10-09 1989-04-26 Marposs Societa' Per Azioni Appareil pour contrôler les dimensions linéaires de pièces
US5083384A (en) * 1987-10-09 1992-01-28 Marposs Societa' Per Azioni Device for checking linear dimensions of parts
JPH06221806A (ja) * 1992-12-03 1994-08-12 Mitsutoyo Corp タッチ信号プローブ
US6269546B1 (en) 1996-11-07 2001-08-07 Marposs Societa Per Azioni Head for the linear dimension checking of mechanical pieces
EP1152209A2 (fr) * 2000-05-01 2001-11-07 Mitutoyo Corporation Palpeur de mesure de forme et instrument de mesure de forme
WO2006037749A1 (fr) * 2004-10-01 2006-04-13 Marposs Societa' Per Azioni Appareil de controle dimensionnel et/ou geometrique de pieces mecaniques
US7412778B2 (en) 2004-10-01 2008-08-19 Marposs Societa' Per Azioni Apparatus for dimensional and/or geometric checking of mechanical parts

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