WO2010037378A1 - Verfahren zum messen und/oder prüfen einer welligkeit eines flächigen textils - Google Patents
Verfahren zum messen und/oder prüfen einer welligkeit eines flächigen textils Download PDFInfo
- Publication number
- WO2010037378A1 WO2010037378A1 PCT/DE2009/001381 DE2009001381W WO2010037378A1 WO 2010037378 A1 WO2010037378 A1 WO 2010037378A1 DE 2009001381 W DE2009001381 W DE 2009001381W WO 2010037378 A1 WO2010037378 A1 WO 2010037378A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- textile
- surface profile
- flat textile
- flat
- Prior art date
Links
Classifications
-
- 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
- G01B5/28—Measuring arrangements characterised by the use of mechanical techniques for measuring roughness or irregularity of surfaces
- G01B5/285—Measuring arrangements characterised by the use of mechanical techniques for measuring roughness or irregularity of surfaces for controlling eveness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B13/00—Measuring arrangements characterised by the use of fluids
- G01B13/22—Measuring arrangements characterised by the use of fluids for measuring roughness or irregularity of surfaces
Definitions
- the invention relates to a method for measuring and / or checking a waviness of a flat textile.
- the invention relates to a device for measuring and / or checking a waviness of a flat textile, with a support for arranging the flat textile.
- Flat textiles ie textile fabrics such as, for example, multiaxial fabrics, are used in particular in the production of fiber-reinforced plastic components. It has been found that the strength of the later fiber-reinforced component is greatly influenced by the uniformity of the flat textile used. There is therefore a desire to monitor the geometrical shape parameters, in particular the waviness, such as the layer waviness, of the flat textile, in order to ensure that the fiber-reinforced component produced using the flat textile has the desired strength.
- Optical methods based on computer-aided analysis of images of the planar textile are known.
- images of the flat textile are recorded and determined with image analysis software certain geometric shape parameters.
- a disadvantage of such methods is that, in particular, the layer waviness can not be determined from the plane.
- the geometrical shape parameter in the form of the layer waviness that is to say the waviness of the flat textile out of the plane, it is known to cut the finished component and to determine the layer position on the cut piece. to determine ripple.
- the disadvantage of this is that no 100% test is possible, which is unsatisfactory especially for safety components.
- DE 195 35 259 A1 discloses a method and a device 5 for measuring and / or checking a geometric shape parameter of a flat textile, wherein the flat textile is arranged on a support and detects the surface profile of the flat textile by scanning by means of a light line becomes.
- the document DE 19 01 979 A describes a method and a device for measuring the fine shape, ie a geometrical shape parameter, of the grinding surface of a grinding belt, wherein the grinding belt is arranged between a support and a flexible film, a pressure between the grinding belt and the film is produced (by pressure shoes), so that the film conforms to the sanding belt, and the surface shape of the film is detected after the clipping process.
- the document US 49 51 497 A discloses a method and an apparatus for measuring a geometrical shape parameter, in particular the roughness, of a surface, wherein a deformable element is arranged on the surface and by applying a pressure between the element and the surface causing the element to conform to the surface, thereby deforming the element on its surface-facing side and causing this deformation to affect deformation of the other side 5 of the element and to detect the deformation of that side and measure the geometrical shape parameter Surface is evaluated.
- US 3,500,598 A describes a method for measuring a geometric shape parameter of an inner surface of a hollow body, wherein a flexible film (in the form of a tube) is placed in the cavity of a body and a pressure is applied between the body and the tubular film so that the film adheres to the inner surface of the Enclosed hollow body and the surface shape of the film impressed and after removal of the film from the body, the surface profile of the film is detected.
- a flexible film in the form of a tube
- the object of the invention is to measure geometric shape parameters, in particular the waviness of a flat textile, non-destructively with high accuracy.
- the invention solves the problem by a method for measuring or checking a geometrical shape parameter, in particular a ply ripple, of a flat textile comprising the steps of (a) arranging the flat textile in a space between a backing and a flexible film, (b) applying a differential pressure between space and environment, so that the film conforms to the sheet textile, and (c) detecting a surface profile of the film.
- a geometrical shape parameter in particular a ply ripple
- the invention solves the problem by a generic device comprising a film lay-up device for applying a film, a differential application device for applying a differential pressure, so that the film conforms to the flat textile, and a surface profile Detecting device for detecting a surface profile of the film has.
- the flat textile is a multiaxial fabric
- this multi-axial fabric comprises at least two layers of fibers or fiber bundles.
- the fiber bundles of a layer run parallel to each other in a respective fiber direction, the fiber bundles of adjacent layers form an angle different from zero with each other.
- the strength of a fiber-reinforced structural component produced using the sheet-like textile strongly depends on the cross-section of the individual fiber bundles. The more circular a fiber bundle is, the stronger it is in the adjacent Barten Lay out a waviness and the lower the strength of the finished fiber-reinforced construction component at the relevant point. Only by 100% test can be ensured that the ripple, in particular the position waviness, at all points within a predetermined tolerance interval 5. This is guaranteed by the invention.
- Flexible films are, for example, in the form of a polyethylene film, cheap to produce, so that caused by the application of the film only smallificatêto.
- the method according to the invention can be carried out very quickly and reliably. Unlike known methods, it is not necessary to expect, for example, that a probe sticks to fibers of the flat textile.
- the invention can thus also be used for continuous testing of the flat textile.
- the geometrical shape parameter is understood in particular to be any characteristic number which characterizes the geometric extension of the planar textile from the plane.
- the plane is the plane in which the flat textile extends at the measuring location.
- the geometric shape parameter is a ripple, for example the ply ripple.
- the layer waviness is a measure of the deviation of the surface of the flat textile from a Schmiege Structure, with planar sheet-like textiles of a Schmiegeebene. In particular, shape deviations which are of the order of magnitude of the deviation Stand two fiber bundles lie. The layer waviness is thus in particular a measure of the uniformity of the cross sections of the fiber bundles of a multi-axial laminate.
- a flat textile not only covers textiles that extend along a mathematical plane, but also textiles that have a macroscopic curvature.
- the radius of curvature of the curvature of the planar textile in this case is large compared to a distance of adjacent fibers from one another, for example ten times as large.
- the flat textile is arranged in a space between a gas-tight pad and a flexible film, it is to be understood that the flat textile is arranged between pad and film that applying the differential pressure for nestling of the film to the flat Textile leads.
- very thin foils there is a risk that they will tear, so that the differential pressure between gap and environment can not be applied reliably.
- the optimum thickness of the film is therefore determined in preliminary tests in which films of decreasing thickness are used until such a thin film is used that the process can no longer be carried out reliably. It is then used, for example, the thinnest film, in which a process-reliable performing the method is just possible.
- the flat textile may in particular comprise films of carbon fibers.
- the film preferably has a thickness of less than 200 .mu.m, since it can then cling particularly well to the flat textile.
- Suitable examples are films of polyolefin, such as polyethylene.
- the pad is gas-tight and the application of the differential pressure between the gap and the surrounding area comprises an evacuation of the gap.
- Such a method is particularly easy to carry out, for example, since openings must be provided only in the pad, can be removed through the air from the space.
- the film lays particularly close to the flat textile and forms the geometric shape of the flat textile particularly well.
- the flat textile is preferably a multiaxial fabric, in particular a semifinished product.
- the semifinished product is used for the production of aircraft components. From such semi-finished products almost exclusively safety-relevant components are produced, so that it is particularly advantageous to carry out a 100% examination of the underlying flat textile.
- the detection of the surface profile comprises a contactless scanning. This can be done for example by an optical scanning, for example by means of laser or strip projection method.
- Non-contact methods have the advantage of being particularly fast. It is possible to choose the film so that a non-contact scanning is particularly well possible.
- the film may be anti-reflective, so that measurement errors due to reflection are suppressed.
- the detection of the surface profile takes place at least along a fiber orientation of the textile. It has been found that ripples measured along a fiber orientation provide a particularly good indication of any defects in the flat textile. If the flat textile is a multiaxial fabric, there are several fiber directions, namely one for each situation. The fiber orientation of a layer is the direction in which the fibers run.
- the method can be carried out particularly quickly if the surface profile is detected over a wide area, for example by optical methods.
- optical methods For detecting surface profiles, a large number of methods are known from the prior art, such as how quickly and accurately the surface data can be detected and how this data can be evaluated.
- a spatial Fourier transformation in particular a fast Fourier transformation, can be carried out with which the proportion of shape deviations having a wavelength which lies in the range of the distance between two adjacent fiber bundles of a multi-axial laminate is determined.
- the method preferably comprises the steps of calculating a characteristic from the surface profile which describes the state ripple, and comparing the characteristic value with a desired value.
- the characteristic value may be, for example, the dominant wavelength, local deviations from a predefined desired contour, or a fiber angle. If the flat profile fulfills the requirements by being within the specified setpoint interval, it can be assumed with great certainty that the fiber-reinforced component produced using the flat textile has the desired strength properties.
- the method is a method for producing a composite component, wherein initially a flat textile is provided and tested by a method according to the invention. Only when the flat textile corresponds to a given specification, it is used for the production of the fiber-reinforced component.
- the flat textile is impregnated with resin and then cured the resin.
- the Folienauflege- device is designed for laying a circumferential film. This means that, for example, a film loop is present, which rotates, so that the same film is placed several times on the flat textile and used to carry out the method according to the invention. In this way, material is saved on film.
- the support comprises a device for applying a vacuum to a gap between the laid-up textile and the overlying film.
- a vacuum may be, for example, small openings in the support, which are so small that the flat textile is only insignificantly deformed by the application of the vacuum. It is particularly favorable if such openings are arranged so that a deformation, which is caused by the application of the vacuum, can be separated from any material defects of the flat textile.
- FIG. 1 shows a device according to the invention for carrying out an invented
- Figure 2 shows an alternative embodiment of an inventive
- FIG. 1 shows a flat textile 10 in the form of a multiaxial fabric or a fabric of reinforcing fibers, for example carbon fibers.
- the flat textile 10 has a first layer 12 of a plurality of fiber bundles 14.1, 14.2, ..., which run parallel to each other and preferably all comprise the same number of not visible in Figure 1 carbon fibers. 5
- the flat textile 10 also comprises a second layer 16 of fiber bundles, of which only the fiber bundle 18 can be seen in cross section.
- the fiber bundles 14 on the one hand and 18 on the other hand include a not marked fiber angle.
- the flat textile 10 is a semi-finished product which is infiltrated with a matrix material, such as a synthetic resin, in a subsequent processing step, so that a laminate is formed. By curing in a mold, for example, aircraft parts are produced. However, the invention also relates to a method for producing an aircraft part or other structural components. 5
- the flat textile 10 rests on a support 20, which is formed by a flat, smooth as possible pad plate.
- a film 22 is placed around the flat textile 10 to be tested.
- the film 22 is a polyethylene film with a thickness of 12 ⁇ m.
- the film 22 is pressed on sealing strips 24o on the support 20 or glued by sealing tapes 24 with the base, so that adjusts a gas-tight connection. Between the ge 20 and the film 22 forms a gap 26 in which the flat textile 10 is arranged.
- the gap 26 is connected to a vacuum pump 30, which continuously sucks air from the gap 26, so that between an ambient pressure pumge b and an internal pressure Pinnen in the space 26th sets a pressure difference ⁇ p of more than 800 mbar.
- the ambient pressure is the atmospheric pressure of approximately 1030 mbar and the internal pressure is below 200 mbar, in particular below 100 mbar.
- an internal pressure of Pinnen 50 mbar is applied.
- the film 22 fits snugly against the flat textile 10 and compresses it in the thickness direction, whereupon a surface profile 32 is formed.
- Local textile thickness differences or thickness deviations from the ideal shape or irregularities in the fiber quantity distribution are clearly evident on the top surface profile 32 of the film 22.
- a surface profile detection device in the form of a probe 34 line.
- a non-transparent film 22 having suitable backscatter properties is used so that non-contact optical surveying apparatuses may be used. For example, it is advantageous if the film is free of mirrors.
- the surface profile 32 of the film 22 is now, in particular in different directions of the sheet-like textile 10, taken and a non-drawn interface to a likewise not inserted drew a computer that processes the data.
- This computer can perform, for example, a Fourier transform and / or filtering. From the measured surface profile 32, for example, statements about dominant wavelengths or angular deviations of the fiber layers 12, 16 are then calculated and compared with predetermined limit values. This makes it possible to make a statement about the quality of the flat textile. If the geometric shape parameters, for example the mentioned dominant wavelengths or angle deviations, are within the limit values, then the flat textile 10 is found to be good and used for further production. Otherwise, the flat textile 10 is discarded.
- the vacuum pump 30 and the corresponding port via the intake passage 28 to the gap 26 are part of a differential pressure applying device.
- Figure 2 shows a second embodiment of a device according to the invention, in which not the surface profile detecting device is moved in the form of the probe 34 relative to the support 20, but in which the flat textile 10 is on a conveyor device 36, for example on a conveyor belt made of an air-permeable Material.
- the conveying device continuously conveys the flat textile 10 forward and the differential pressure application device in the form of the vacuum pump 30 constantly applies a negative pressure to a surface section 40 of the flat textile via a vacuum chamber 38.
- the vacuum pump 30 is designed such that air flowing in from the sides is drawn off, so that an internal pressure Pinnen of below 200 mbar is established in the vacuum chamber 38.
- the vacuum chamber 38 Opposite the vacuum chamber 38 is a Folienierlege- device 42, which hangs a revolving film 22 on a Auflegerolle 44 on the flat textile and decreases via a pickup roller from the flat textile 10 again. Between the laying roller 44 and the pickup roller 46, the surface profile detecting device is arranged in the form of the measuring probe 34. net, which is stationary relative to the vacuum chamber 38 and constantly receives the surface profile 32.
- the measuring machine which is shown in FIG. 2, is preferably part of a textile production line and enables a 100% inspection of the produced flat textile 10. This makes it possible to recognize malfunctions in the production of the flat textile 10 with a very short time delay and to remedy this in a timely manner ,
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Treatment Of Fiber Materials (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Sampling And Sample Adjustment (AREA)
- Moulding By Coating Moulds (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112009003222T DE112009003222A5 (de) | 2008-09-30 | 2009-09-30 | Verfahren zum messen und/oder prüfen einer Welligkeit eines flächigen Textils |
CN200980136422.9A CN102159919B (zh) | 2008-09-30 | 2009-09-30 | 用于测量和/或检验扁平织物波纹度的方法 |
JP2011528187A JP2012504225A (ja) | 2008-09-30 | 2009-09-30 | 2次元のテキスタイルの波形を測定しおよび/または検査する方法 |
US13/120,556 US8573035B2 (en) | 2008-09-30 | 2009-09-30 | Method for measuring and/or testing waviness of a planar textile |
CA2738371A CA2738371A1 (en) | 2008-09-30 | 2009-09-30 | Method for measuring and/or testing waviness of a two-dimensional textile |
BRPI0919029A BRPI0919029A2 (pt) | 2008-09-30 | 2009-09-30 | processo para medição e/ou teste de uma ondulação de uma seção têxtil plana |
EP09744935A EP2338026A1 (de) | 2008-09-30 | 2009-09-30 | Verfahren zum messen und/oder prüfen einer welligkeit eines flächigen textils |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008049577A DE102008049577B3 (de) | 2008-09-30 | 2008-09-30 | Verfahren zum Messen und/oder Prüfen einer Welligkeit eines flächigen Textils |
DE102008049577.8 | 2008-09-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010037378A1 true WO2010037378A1 (de) | 2010-04-08 |
Family
ID=41180679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2009/001381 WO2010037378A1 (de) | 2008-09-30 | 2009-09-30 | Verfahren zum messen und/oder prüfen einer welligkeit eines flächigen textils |
Country Status (9)
Country | Link |
---|---|
US (1) | US8573035B2 (de) |
EP (1) | EP2338026A1 (de) |
JP (1) | JP2012504225A (de) |
CN (1) | CN102159919B (de) |
BR (1) | BRPI0919029A2 (de) |
CA (1) | CA2738371A1 (de) |
DE (2) | DE102008049577B3 (de) |
RU (1) | RU2011117292A (de) |
WO (1) | WO2010037378A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202010012783U1 (de) | 2010-09-17 | 2011-07-26 | Herbert Eberlein | Stapelbarer Einkaufswagen |
RU221027U1 (ru) * | 2023-05-03 | 2023-10-16 | Открытое акционерное общество "Томская домостроительная компания" | Устройство для измерения толщины волокнистых изделий |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103785715B (zh) * | 2014-01-21 | 2016-08-17 | 万世泰金属工业(昆山)有限公司 | 适合各种尺寸金属板的调直检测设备 |
CN103792594A (zh) * | 2014-01-21 | 2014-05-14 | 万世泰金属工业(昆山)有限公司 | 金属板调直检测设备 |
CN103934729B (zh) * | 2014-04-16 | 2016-06-29 | 浙江太阳股份有限公司 | 一种曲轴轴颈磨削波纹方向性的检测方法 |
DE102016002766A1 (de) * | 2016-03-05 | 2017-09-07 | Audi Ag | Verfahren zur Detektion von Fehlstellen einer zur Weiterverarbeitung zu einem Faserverbundbauteil vorgesehen Preform |
CN106091879A (zh) * | 2016-06-03 | 2016-11-09 | 湖南中岳显控科技股份有限公司 | 一种薄壁曲面零件测量方法 |
CN106017353B (zh) * | 2016-07-22 | 2019-07-16 | 大连理工大学 | 一种蜂窝芯面形测量装置 |
CN106017352B (zh) * | 2016-07-22 | 2019-10-29 | 大连理工大学 | 一种蜂窝芯面形的测量方法 |
CN108180847B (zh) * | 2017-12-11 | 2020-04-17 | 南京玻璃纤维研究设计院有限公司 | 一种复杂曲面编织预制体的厚度测量方法 |
Citations (4)
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DE900278C (de) * | 1938-02-26 | 1953-12-21 | Johannes Perthen Dr Ing | Vorrichtung zur Pruefung und Messung von Oberflaechen |
DE1901979A1 (de) * | 1969-01-16 | 1970-08-20 | Pahlitzsch Dr Ing Gotthold | Verfahren und Vorrichtung zur Ermittlung der Kornverteilung an Schleifwerkzeugen |
DE2006282A1 (de) * | 1970-02-12 | 1971-08-19 | Schwarz D | Verfahren zur Ermittlung von Flachen großen |
DE4134174C1 (en) * | 1991-10-16 | 1992-10-22 | Otto 8662 Helmbrechts De Junge | Paper, textile, plastic sheet material linear measurement system - determines number of marks during longitudinal movement of material along belt via guide rollers |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US2993368A (en) * | 1960-06-28 | 1961-07-25 | Herbert N Schlein | Device for testing material |
BE791080A (fr) * | 1971-11-10 | 1973-03-01 | Siemens Ag | Procede et dispositif pour l'examen de la surface interne d'un corps creux |
JPS62174608A (ja) * | 1986-01-28 | 1987-07-31 | Hitachi Ltd | パタ−ン検出装置 |
FR2626361B1 (fr) * | 1988-01-22 | 1990-06-08 | Armines | Procede et appareil de mesure de la rugosite d'une surface d'une piece |
US5658432A (en) * | 1995-08-24 | 1997-08-19 | Measurex Devron Inc. | Apparatus and method of determining sheet shrinkage or expansion characteristics |
DE19535259A1 (de) * | 1995-09-22 | 1997-03-27 | Taurus Daten & Mestechnik Gmbh | Optische Abtastvorrichtung zur Vermessung von Oberflächenstrukturen |
US7570373B2 (en) * | 2006-04-29 | 2009-08-04 | Prompribor, Inc. | System and method to measure parameters distribution in sheet-like objects |
JP5306640B2 (ja) * | 2007-12-17 | 2013-10-02 | 明産株式会社 | シートのたるみ評価方法および評価装置 |
-
2008
- 2008-09-30 DE DE102008049577A patent/DE102008049577B3/de not_active Expired - Fee Related
-
2009
- 2009-09-30 CN CN200980136422.9A patent/CN102159919B/zh not_active Expired - Fee Related
- 2009-09-30 EP EP09744935A patent/EP2338026A1/de not_active Withdrawn
- 2009-09-30 CA CA2738371A patent/CA2738371A1/en not_active Abandoned
- 2009-09-30 RU RU2011117292/28A patent/RU2011117292A/ru not_active Application Discontinuation
- 2009-09-30 US US13/120,556 patent/US8573035B2/en not_active Expired - Fee Related
- 2009-09-30 WO PCT/DE2009/001381 patent/WO2010037378A1/de active Application Filing
- 2009-09-30 JP JP2011528187A patent/JP2012504225A/ja not_active Withdrawn
- 2009-09-30 DE DE112009003222T patent/DE112009003222A5/de not_active Withdrawn
- 2009-09-30 BR BRPI0919029A patent/BRPI0919029A2/pt not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE900278C (de) * | 1938-02-26 | 1953-12-21 | Johannes Perthen Dr Ing | Vorrichtung zur Pruefung und Messung von Oberflaechen |
DE1901979A1 (de) * | 1969-01-16 | 1970-08-20 | Pahlitzsch Dr Ing Gotthold | Verfahren und Vorrichtung zur Ermittlung der Kornverteilung an Schleifwerkzeugen |
DE2006282A1 (de) * | 1970-02-12 | 1971-08-19 | Schwarz D | Verfahren zur Ermittlung von Flachen großen |
DE4134174C1 (en) * | 1991-10-16 | 1992-10-22 | Otto 8662 Helmbrechts De Junge | Paper, textile, plastic sheet material linear measurement system - determines number of marks during longitudinal movement of material along belt via guide rollers |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202010012783U1 (de) | 2010-09-17 | 2011-07-26 | Herbert Eberlein | Stapelbarer Einkaufswagen |
RU221027U1 (ru) * | 2023-05-03 | 2023-10-16 | Открытое акционерное общество "Томская домостроительная компания" | Устройство для измерения толщины волокнистых изделий |
Also Published As
Publication number | Publication date |
---|---|
EP2338026A1 (de) | 2011-06-29 |
BRPI0919029A2 (pt) | 2015-12-08 |
US20110247410A1 (en) | 2011-10-13 |
JP2012504225A (ja) | 2012-02-16 |
RU2011117292A (ru) | 2012-11-10 |
CA2738371A1 (en) | 2010-04-08 |
CN102159919B (zh) | 2014-04-16 |
CN102159919A (zh) | 2011-08-17 |
DE102008049577B3 (de) | 2009-11-19 |
DE112009003222A5 (de) | 2012-04-12 |
US8573035B2 (en) | 2013-11-05 |
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