EP2425233A2 - Dispositif de mesure de pièces usinées par tomographie assistée par ordinateur - Google Patents

Dispositif de mesure de pièces usinées par tomographie assistée par ordinateur

Info

Publication number
EP2425233A2
EP2425233A2 EP10722929A EP10722929A EP2425233A2 EP 2425233 A2 EP2425233 A2 EP 2425233A2 EP 10722929 A EP10722929 A EP 10722929A EP 10722929 A EP10722929 A EP 10722929A EP 2425233 A2 EP2425233 A2 EP 2425233A2
Authority
EP
European Patent Office
Prior art keywords
workpiece
carrier unit
detector
ray source
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10722929A
Other languages
German (de)
English (en)
Inventor
Martin Simon
Siegfried Heeg
Ralf Hock
Manfred Etzel
Uwe Hilpert
Severin Ebner
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.)
Wenzel Volumetrik GmbH
Original Assignee
Wenzel Volumetrik GmbH
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 Wenzel Volumetrik GmbH filed Critical Wenzel Volumetrik GmbH
Publication of EP2425233A2 publication Critical patent/EP2425233A2/fr
Withdrawn legal-status Critical Current

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    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
    • G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/58—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising fillers only, e.g. particles, powder, beads, flakes, spheres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/70—Completely encapsulating inserts
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
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    • C04B35/528—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components
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    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
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    • C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B35/63436—Halogen-containing polymers, e.g. PVC
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    • C04B35/6344—Copolymers containing at least three different monomers
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    • C04B35/63444—Nitrogen-containing polymers, e.g. polyacrylamides, polyacrylonitriles, polyvinylpyrrolidone [PVP], polyethylenimine [PEI]
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D11/00—Central heating systems using heat accumulated in storage masses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/10—Heat storage materials, e.g. phase change materials or static water enclosed in a space
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/12—Tube and panel arrangements for ceiling, wall, or underfloor heating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00—Investigating materials by wave or particle radiation
    • G01N2223/30—Accessories, mechanical or electrical features
    • G01N2223/309—Accessories, mechanical or electrical features support of sample holder
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00—Investigating materials by wave or particle radiation
    • G01N2223/30—Accessories, mechanical or electrical features
    • G01N2223/33—Accessories, mechanical or electrical features scanning, i.e. relative motion for measurement of successive object-parts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00—Investigating materials by wave or particle radiation
    • G01N2223/30—Accessories, mechanical or electrical features
    • G01N2223/33—Accessories, mechanical or electrical features scanning, i.e. relative motion for measurement of successive object-parts
    • G01N2223/3306—Accessories, mechanical or electrical features scanning, i.e. relative motion for measurement of successive object-parts object rotates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00—Investigating materials by wave or particle radiation
    • G01N2223/30—Accessories, mechanical or electrical features
    • G01N2223/33—Accessories, mechanical or electrical features scanning, i.e. relative motion for measurement of successive object-parts
    • G01N2223/3307—Accessories, mechanical or electrical features scanning, i.e. relative motion for measurement of successive object-parts source and detector fixed; object moves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00—Investigating materials by wave or particle radiation
    • G01N2223/30—Accessories, mechanical or electrical features
    • G01N2223/33—Accessories, mechanical or electrical features scanning, i.e. relative motion for measurement of successive object-parts
    • G01N2223/3308—Accessories, mechanical or electrical features scanning, i.e. relative motion for measurement of successive object-parts object translates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00—Investigating materials by wave or particle radiation
    • G01N2223/40—Imaging
    • G01N2223/408—Imaging display on monitor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00—Investigating materials by wave or particle radiation
    • G01N2223/40—Imaging
    • G01N2223/419—Imaging computed tomograph
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00—Investigating materials by wave or particle radiation
    • G01N2223/60—Specific applications or type of materials
    • G01N2223/633—Specific applications or type of materials thickness, density, surface weight (unit area)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

Definitions

  • the present invention relates to a computer tomographic workpiece measuring device according to the preamble of the main claim.
  • Such devices for non-medical computed tomography are generally known from the prior art and are based on the measurement principle, analogous to human or veterinary computed tomography, workpieces with a high-power X-ray beam as invasive radiation to irradiate and illuminate, with the workpiece as a measuring object is typically located on a turntable as a workpiece carrier between a (high-power) X-ray source and an electronic X-ray detector.
  • the detector captures the X-rays penetrating the object pixel by pixel by means of suitable detector pixels.
  • a plurality of X-ray images can be created from different directions (perspectives), which are then assembled in a downstream evaluation unit in a three-dimensional model as volume information and further evaluations or reprocessing, e.g. for visual display on a monitor or the like. with the possibility for further visual inspection.
  • Such, as known vortexde devices have about so-called tactile measuring method (in which, typically by means of three-dimensional movable buttons, a workpiece with its outer contour can be scanned) the advantage of reliably detect and reproduce even mechanically inaccessible interior areas and cavities or undercuts a workpiece can be, so that, in addition to the range of application known push-button coordinate measuring, a computer tomographic non-medical workpiece measurement (surveying) in particular also suitable for purposes of assembly and defect control, porosity analysis, wall thickness measurement or other complex metrological evaluations, to tasks of reverse Engineering, in which, based on a physically present measurement object, the obtained outer and inner contour data can then be transformed into suitable CAD data.
  • Generic computer tomographic workpiece measuring devices usually employ hardware, X-ray sources which have a punctiform radiation outlet, and line-like or (approximately) square detector arrays associated with this X-ray source (in particular in the present field of so-called cone beam tomography with two-dimensionally arranged detectors). Not least due to the geometric conditions of originating from medical detectors, these typically have pixel sizes in the range between about 200 and 400 .mu.m, wherein, to achieve a sufficient accuracy, a workpiece carrier unit, disposed between the X-ray source and the detector, approximately centrally or in Direction is placed on the X-ray source to achieve, according to the detector geometry and its resolution, the desired magnification of the x-ray image.
  • X-ray tomography requires a (lead) ) Shielding the relevant passages so that large mechanical dimensions (particularly relative to the dimensions of a workpiece to be tested) adversely affect manufacturing costs, weight and installation requirements (such as the need for additional mechanical reinforcement on a substrate). It is therefore an object of the present invention to improve a generic computer-tomographic workpiece measuring device with regard to its measuring and imaging properties, while at the same time creating the possibility of designing such a device more compactly and with less mechanical outlay.
  • the invention provides for providing the carrier unit (with the workpiece to be provided thereon) relatively closer to the detector means, in particular so as to provide that on a middle of the distance between X-ray source and detector, the carrier unit is closer to the detector means.
  • This measure is associated with the inventive measure to use small detector pixels, namely those whose maximum pixel size is smaller than 100 .mu.m.
  • the image quality can be significantly increased since, compared with the prior art, of a constant or improved resolution, unwanted movements or instabilities of the X-ray source have a less pronounced effect.
  • this geometry makes it possible to realize a much more compact arrangement, since the measures described can in fact reduce the distance between the X-ray source and the detector means.
  • these features are associated with the movability of the workpiece carrier unit, in particular in a vertical direction ("vertical” being understood to mean along the center or rotation axis of the workpiece carrier unit and thus parallel to the flat or narrow side of the detector means).
  • this movability makes it possible to provide a workpiece as a measuring object on the workpiece carrier unit, which extends over the detector unit along the vertical direction, so that the various sections of this workpiece successively move through (continuous or sectional) movement along the vertical direction
  • the device is already suitable for workpieces whose dimensions exceed the geometric relationships between the beam path and the effective detector surface (clearly)
  • If such (typically elongated) objects are aligned vertically with their longitudinal axis on the workpiece carrier unit (in contrast to typically known procedure in which such an object is transverse and flat and thus completely in the beam path), which is irradiated by the X-ray beam or to be irradiated mass of the workpiece.
  • a vertical movement realized, not only a (single) object can be vertical This procedure also offers the possibility of ness, the workpiece carrier unit in such a way to design (or provided with suitable support means) that they can carry a plurality of individual workpieces one above the other (even several side by side per height level) arranged.
  • the workpiece carrier unit in such a way to design (or provided with suitable support means) that they can carry a plurality of individual workpieces one above the other (even several side by side per height level) arranged.
  • This then allows again, in the manner of a vertical magazine, a preferably automated sequential processing of individual workpieces, which are successively moved by the vertical movement of the workpiece carrier in the beam path (or back out of this).
  • the detector means as a rectangular-area array.
  • the carrier unit additionally performs a longitudinal or axial movement along the axis of rotation according to further development.
  • resulting X-ray (single) images can in turn be suitably assembled to form complete surface models and then volume models, corresponding to a workpiece to be tested.
  • the rectangular form according to the invention i. no quadratic shape, moreover, by the fact that errors which arise in the reconstruction of generic, almost square detector images can be reduced.
  • surface or “surface” in the context of the invention is not necessarily a flat (rectangular) surface to understand; Rather, this also includes a curved surface, or else an arrangement of individual detectors (eg a plane) arranged in line with one another along a curved line. The side or edge length ratio according to the invention would then be correspondingly dimensioned by an associated arc line. Nevertheless, in order to ensure the flexibility and adaptability to various possible magnification scales, provision is made according to a further development to shift the detector means, in addition or alternatively the X-ray source, in the direction of the beam path.
  • the carrier unit advantageously integrated into a housing, be designed such that both the turntable functionality, including the adjustable rotation about an axis of rotation, as well as a linear displacement of the turntable (bearing surface) in the axial direction, be performed simultaneously or sequentially;
  • the carrier unit advantageously constitutes a modular unit which has the respective drive means integrated into the housing and offers a suitable control interface for carrying out the movements.
  • the housing of the carrier unit would thus offer on the one hand the rotary drive (first drive means) for the workpiece support surface (which could be, for example, an upper end face of the housing), then in addition a motor would be arranged in the housing, for instance in the manner of a spindle drive after the bottom side a propulsion and therefore the linear drive causing spindle drives out of the housing.
  • first drive means for the workpiece support surface
  • a motor would be arranged in the housing, for instance in the manner of a spindle drive after the bottom side a propulsion and therefore the linear drive causing spindle drives out of the housing.
  • this carrier unit (or the associated housing) is designed so that it can additionally cause storage (preferably air storage) of the support surface and / or turntable.
  • storage preferably air storage
  • at least the components X-ray source, detector means and carrier unit (in the housing together with drive units) together on a holding bed or the like. are defined by continuous underlying support device.
  • these units more preferably not buffered by elastic or other means against each other, common to an underlying ground, a surrounding housing or the like. Shock and / or vibration damped stored, this approach reduces mechanical complexity in a simple and elegant way, promotes compactness and at the same time an optimal decoupling of disturbing environmental influences, such as vibrations or the like., Causes.
  • the configuration offers the possibility of a heat-insulating disc or the like.
  • Heat insulation unit to place in the beam path between the X-ray source and the carrier unit, wherein the distance configuration according to the invention for this purpose leaves enough space and nevertheless allows a compact overall arrangement.
  • this heat-insulating pane now makes it possible to provide air-conditioning in the area of the detector unit or of the workpiece carrier, i. a thermal development in the region of the X-ray source that is detrimental to both the detector accuracy and an undesired thermal expansion of a workpiece to be measured thermally effectively separated from this area to be understood as a measuring or climatic chamber.
  • This refinement according to the invention makes it possible to further increase the accuracy of measurement, in particular to require that certain workpieces be measured at predetermined reference temperatures and otherwise not be precluded by the X-ray source from heating up the entire interior space, as in the case of long scan or surveying cycles can.
  • the detector unit associated or downstream evaluation means In principle, known from the prior art electronic processing of the pixel data in two- or three-dimensional data sets (Schaaren) of the workpiece so that in accordance with the invention advantageously known from the prior art aufrungs- and / or Stammzeugungssys- systems, as they in particular be used in connection with mechanical probe coordinate measuring devices, directly loaded with data and so far can be used immediately, without further data processing effort is necessary: So it is especially provided in the context of developments of the invention and preferred, according to the (typically standardized ) To generate and provide a plurality of three-dimensional dot and / or face data to measured data formats of known mechanical probe coordinate measuring devices, in order then to subsequently store an image formation, a generation of raster or gratingmus or from CAD data.
  • the detector unit associated or downstream evaluation means In principle, known from the prior art electronic processing of the pixel data in two- or three-dimensional data sets (Schaaren) of the workpiece so that in accordance with the invention advantageously known
  • the present invention surprisingly allows for the production of compact, high performance and reliable computed tomography workpiece measuring devices, which promise potentially significant dimensional reductions, associated cost savings, and, in addition, potentially increased imaging and surveying quality, the benefits of non-medical computer-tomographic workpiece measurement can be made accessible to new application areas.
  • FIG. 3 shows a block diagram for clarifying essential functional components and their interaction in the realization of a system for computer tomographic workpiece measurement including interface technology for known presentation and evaluation peripherals of probe coordinate measuring devices.
  • FIG. 1 illustrates in the schematic side view, as within a radiation protection (eg via a lead clothing) offering frame 10 on a base plate 12 (holding bed), which via dampers 14 relative to the frame 10 damping (shock and / or vibration-inhibiting) supported, an X-ray source 16 (eg closed microfocus or macro focus X-ray source) is provided.
  • the X-ray source 16 is, schematically indicated by an adjustment unit 18 and arrows 46 in Fig. 2, linear along a travel and adjustable in order to make an adjustment to a predictable on a turntable 20 measuring object (workpiece).
  • the turntable 20 With an X-ray permeable, disc-like heat insulation screen 22 separated from the X-ray source 16, the turntable 20 is seated on a vertically linearly movable housing unit 26 by means of a bearing unit 24, which carries inside a provided for driving the turntable 20 rotary unit (eg stepper motor), further to (preferably air-supported) vertical movement within the plate 12, the necessary means in otherwise known manner.
  • the heat-insulating protective screen 22 produces an air-conditioned chamber in the area to the right of this pane, which can be provided with otherwise known air-conditioning means (not shown) such that the heat-sensitive area of the detector unit or the workpiece carrier unit can be predefined Temperature can be maintained and in particular of adverse heat development of the X-ray source 16 remains unaffected.
  • a detector unit 28 which is positioned relative to the X-ray source and the turntable 20 at the end of a schematically shown beam path 30, that an X-ray passing through a workpiece 30 strikes the detector unit 28 and there, of a plurality of square Surface-mounted, X-ray-sensitive semiconductor photo-elements pixel-wise recorded and fed to further processing. More specifically, in the present embodiment, an X-ray detector is provided which has an effective sensor area of 7.5 cm (horizontal) x 5 cm (vertical) at a resolution of 200 pixels per cm (corresponding to a total pixel count of about 1500,000 pixels ) intended.
  • Its output signal is supplied to a control unit 32 and is then ready for computational further processing, image processing or other interface functions; in a favorable constructive-apparatus configuration, as schematically shown in Fig. 1, the frame-like housing 10 directly associated with a desk surface 34, so that the compactness of the arrangement is further increased.
  • the desk surface 34 also provides in the substructure 36 the possibility of further processing means, e.g. a computer array.
  • the integration of the desk surface is also claimed independently and in connection with the preamble as invention.
  • the result of the configuration shown is an extremely compact system, not least due to the geometric relationships between the units involved, which are illustrated in detail in FIG. 2:
  • the X-ray source A is removed by a distance A of 36.5 cm from the turntable unit 20 or the housing unit 26 (more precisely: from a central axis 42 which extends centrally through these units). Accordingly, this ratio results in a ratio A / B of 0.915.
  • the workpiece 40 is displaceable about a vertical stroke, illustrated by the double arrow 44; a typical example of a maximum stroke is about 20 cm. It is also provided in the invention, the X-ray source 16 to make a horizontal linear stroke of 20 cm (arrows 46) displaceable, as well as (or alternatively) the detector unit 28 by a horizontal linear stroke 48 of 10 cm.
  • FIG. 3 illustrates the schematic interaction of the functional units with an associated processing and evaluation unit: More specifically, the X-ray source 16, the detector unit 28, and a rotation controller 50 and a vertical motion controller 52 (for the turntable 20 and the vertical lift actuator 26, respectively) cooperate with the control unit 32 shown schematically in Fig. 1, which on the one hand controls the necessary movements of the units, on the other hand controls the emission of the X-ray source 16 and causes the radiation detection by the detector unit 28 and the detection of the incoming pixel signals.
  • These signals are first stored in a downstream two-dimensional image memory 54 as a plurality of (two-dimensional) individual images, in order then to be computed or computed into a three-dimensional (volume) image in a further downstream three-dimensional processing unit 56.
  • these three-dimensional data of the unit 56 are also available in the form of 3D data sets, points and / or vectors and correspondingly typical interface or data formats of probe coordinate measuring devices at an interface unit 58 as shown in Fig. 3, with a downstream, standardized evaluation unit 60 (as it can typically interact with just those known probe coordinate measuring devices) and an evaluation result for a display unit 62, eg a screen, a printer od.
  • a display unit 62 eg a screen, a printer od.
  • the units shown as functional components in FIG. 3 can exist as discretely implemented hardware modules, additionally or alternatively in the form of suitably programmed computer or controller units, if appropriate as clusters of parallel computers.

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Abstract

L'invention concerne un dispositif de mesure de pièces usinées par tomographie assistée par ordinateur. Le dispositif selon l'invention comprend une source de rayons X (16) servant à générer un rayonnement intrusif, des moyens de détection (28) servant à détecter le rayonnement intrusif, ainsi qu'un porte-pièce (20, 24, 26) comportant un axe central et/ou de rotation et réalisé de sorte qu'une pièce à mesurer (40) portée par le porte-pièce peut être placée dans une trajectoire (30) du rayonnement intrusif entre la source de rayons X et les moyens de détection et peut être déplacée dans la trajectoire du rayonnement, en particulier le long de l'axe central ou de rotation. Selon l'invention, le rapport A/B d'une première plus petite distance A entre une sortie de rayonnement de la source de rayons X (16) et l'axe central ou de rotation (42), s'étendant dans la trajectoire du rayonnement, du porte-pièce à une deuxième plus petite distance B entre la sortie de rayonnement et les moyens de détection présentant une pluralité de pixels détecteurs placés bidimensionnellement sur une surface est supérieur à 0,5, de préférence supérieur à 0,7 et, mieux encore, supérieur à 0,8, le rapport des côtés et/ou des longueurs d'arête de la surface des moyens de détection se situe dans la plage 1,5:1 à 500:1 et de préférence dans la plage 2:1 à 100:1 et les pixels détecteurs ont une taille maximale inférieure à 100 µm, de préférence inférieure à 80 µm et, mieux encore, inférieure à 50 µm.
EP10722929A 2009-04-30 2010-04-30 Dispositif de mesure de pièces usinées par tomographie assistée par ordinateur Withdrawn EP2425233A2 (fr)

Applications Claiming Priority (2)

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DE102009019215A DE102009019215A1 (de) 2009-04-30 2009-04-30 Computertomographische Werkstückmessvorrichtung
PCT/EP2010/002650 WO2010124868A2 (fr) 2009-04-30 2010-04-30 Dispositif de mesure de pièces usinées par tomographie assistée par ordinateur

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US (1) US20120155606A1 (fr)
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WO (1) WO2010124868A2 (fr)

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US20120155606A1 (en) 2012-06-21
DE102009019215A1 (de) 2010-11-11
WO2010124868A2 (fr) 2010-11-04
WO2010124868A3 (fr) 2011-02-24
CN102460133A (zh) 2012-05-16
CN102460133B (zh) 2014-06-04
DE202009019014U1 (de) 2015-08-31

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