• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Cracks and surface flaws in billets are detected by heating the surface of the work-piece by means of high frequency current, the heating taking place while the work-piece is brought to pass in its longitudinal direction through a high frequency induction coil. That part of the work-piece, which has just left the coil is immediately, while the work-piece is still passing through the coil, scanned by means of infrared recording equipment which records the temperature distribution across the work-piece. The emission coefficient for the different work-pieces is increased and differences equalized by moistening the surface of the work-piece with an appropriate liquid, for instance water, to which have been added components for reduction of the surface tension.
    公开号:SU1248536A3
    申请号:SU823513950
    申请日:1982-11-02
    公开日:1986-07-30
    发明作者:Руне Халсер Свен；Коре Сторсет Магнар
    申请人:Элкем А/С (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to radiation pyrometry and can be applied to identify surface cracks or defects in workpieces so that they can be noted, for example, by grinding workpieces, while defective workpieces will not undergo further processing. defects with a depth of less than 1 mm by increasing the degree of blackness of the blanks and compensating for the difference in their degree of blackness.
    The drawing shows the results of measuring the temperature of dry and wet surfaces with an infrared radiation pyrometer,
    The method is carried out as follows.
    The surface of the preform is wetted with water, the surface of the preform is heated with high frequency current while the preform is passed through an induction coil, and the temperature distribution over the preform is recorded using infrared equipment (an infrared pyrometer). The defects manifest themselves as local features of the temperature field.
    It has been found that the degree of blackness of all types of surfaces of the workpieces can be approximately equalized by wetting the surface with water to which components must be added that reduce the surface tension coefficient in order to improve the wettability of the surface. To inspect the workpiece at temperatures; below O C, you can add components that lower the freezing point. Experiments have shown that by wetting the surface of the workpiece with water, to which components that reduce its surface tension are added, all surfaces of the workpieces, regardless of their pretreatment, were reduced to approximately the same degree of blackness, and blackness (the radiation coefficient J deviates only to an insignificant degree from the degree of blackness characteristic of a dry billet having mill-scale. Changes in the degree of blackness of wetted billets are so small that almost Demonstrates the effect on the measurement results obtained by the proposed method. As a result of wetting the workpieces, the temperature variation over the workpiece decreases, i.e., the differences in the degree of blackness for different surface areas disappear, thereby achieving a significant improvement in signal tupayug (them from the pyrometer infrared radiation. When shot blasting
    blanks that have not been wetted, the change in signal at the defective location is so small that to determine the types of
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    five
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    five
    The surface of the workpiece problems when examining the most minor cracks.
    The results of temperature measurements using a contact pyrometer, as well as an infrared pyrometer of various types of workpiece surfaces (wetted and dry) are given in the B table,
    Sample A refers to a mill with mill scale. Sample B relates to a workpiece with a corroded (rusty) surface, while samples CSa 1-2, CSaZ and CSa 2 1/2 were blast cleaned, and the surfaces were determined in accordance with Swedish standard S / S 055900-1967 (AA7 , B, 102 V, 66 A, 27 B, 60 D),
    In the table, T denotes the temperature measured by a contact pyrometer, and the IR temperature measured by an infrared pyrometer. The readings were obtained on dry (dry) and wetted (wetted) surfaces.
    As can be seen from the table, when measuring on a dry surface, there is a wide range of temperatures, and the differences increase with an increase in the degree of surface cleaning by a shot-blasting method (see columns indicated respectively CSa 1-2, CSa 2 and CSa 2 1/2), Differences between the two measurement methods increase with increasing purity of the blanks. This is due to the fact that when measuring the temperature of workpieces cleaned by a bead-blasting method with an pyrometer of infrared, red radiation, too low temperatures are recorded. Consequently, in the area of the defect, a small increase in the signal takes place; therefore, in order to obtain acceptable results, it is necessary to calibrate the equipment depending on step 1
    blackness of the surface, which is a significant disadvantage, since the degree of blackness can vary from billet to billet.
    Reducing the signal in the area of cracks for surfaces cleaned by a shot-blasting method makes it difficult to detect small cracks.
    From the table it can be seen that the degree of blackness of the surface of various blanks can be changed and approximately equalized by wetting the surface. An approximate adjustment means that the degrees of blackness fall within a range that can be considered acceptable. The preform can be wetted before it passes through the induction coil, and the water per formula of the invention
    权利要求:
    Claims (2)
    [1]
    1 A method for determining defects in surfaces of workpieces, including heating the surface of workpieces using high frequency currents during the passage of the workpiece in the longitudinal direction through a high frequency induction coil and the subsequent inspection of the workpiece using infrared equipment recording the distribution of the temperature of the workpiece,
    Compiled by Latyev Editor L. Veselovska Tehred E. Chizhmar Proofreader S. Shekmar
    Order 4143/60 Circulation 778 Subscription
    VNIIPI USSR State Committee
    for inventions and discoveries 113035, Moscow, Zh-35, Rauschska nab., 4/5
    Production and printing company, Uzhgorod, st. Design, 4,
    48536
    the surface is fed as uniformly as possible through a nozzle, a slit, or a similar, hygienic device, or by flow. neither The effect of wetting is shown in Table 5,
    The measurement results for the dry and wet surfaces shown in the table are shown graphically in the drawing.
    to
    As can be seen from the graph, the degree of blackness of all wetted surfaces has the same level as the billet with mill scale (blank A), 15, and all of the wetted surfaces are approximately the same degree of blackness, which approaches the theoretically maximum value
    that, in order to ensure the registration of surface defects with a depth of less than 1 mm by increasing the degree of blackness of the blanks and compensating for the difference in their degree of blackness, the surface of the blanks is pre-moistened with water
    surface tension reducers,
    [2]
    2. The method of pop. 1, which differs from the fact that the components that lower the freezing point are added to the water.
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    同族专利:
    公开号 | 公开日
    PL135184B1|1985-10-31|
    ATA399382A|1991-06-15|
    RO83786B|1984-04-30|
    GB2109927B|1985-04-11|
    SE8206191D0|1982-11-01|
    ES517034A0|1984-01-01|
    FR2515826B1|1985-09-13|
    NO813705L|1983-05-04|
    AU559277B2|1987-03-05|
    SE451345B|1987-09-28|
    CH660921A5|1987-05-29|
    IN157612B|1986-05-03|
    NO149793C|1984-07-04|
    MX159861A|1989-09-21|
    LU84451A1|1983-06-13|
    CS259859B2|1988-11-15|
    IT8224045D0|1982-11-03|
    BE894882A|1983-02-14|
    KR840002521A|1984-07-02|
    GB2109927A|1983-06-08|
    BR8206340A|1983-09-20|
    YU246082A|1984-12-31|
    FR2515826A1|1983-05-06|
    NL190384B|1993-09-01|
    DE3240397A1|1983-06-16|
    RO83786A|1984-04-02|
    PL238846A1|1983-06-20|
    NL8204268A|1983-06-01|
    SE8206191L|1983-05-04|
    DE3240397C2|1987-01-29|
    JPH0348461B2|1991-07-24|
    AT393908B|1992-01-10|
    IT1153350B|1987-01-14|
    ES8402079A1|1984-01-01|
    HU184099B|1984-06-28|
    KR880001691B1|1988-09-06|
    ZA827832B|1983-08-31|
    CA1186770A|1985-05-07|
    US4480928A|1984-11-06|
    CS783482A2|1988-04-15|
    NL190384C|1994-02-01|
    JPS5885146A|1983-05-21|
    AU9013182A|1983-05-12|
    NO149793B|1984-03-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3020745A|1958-11-13|1962-02-13|Smith Corp A O|Method of flaw detection in a metal member|
    US3378685A|1965-05-20|1968-04-16|Atomic Energy Commission Usa|Infrared nondestructive testing technique independent of sample surface emissivity|
    US3451254A|1965-07-26|1969-06-24|Automation Ind Inc|Nondestructive tester|
    US3433052A|1965-07-26|1969-03-18|Automation Ind Inc|Material tester|
    US3504524A|1966-09-09|1970-04-07|Automation Ind Inc|Method of thermal material inspection|
    US3511086A|1966-11-23|1970-05-12|Boeing Co|Nondestructive testing with liquid crystals|
    DE2314650C3|1973-03-23|1978-10-12|Kraftwerk Union Ag, 4330 Muelheim|Method and device for finding defective fuel rods|
    JPS5816143B2|1975-06-26|1983-03-29|Nippon Steel Corp|
    GB1559922A|1977-09-15|1980-01-30|English Electric Valve Co Ltd|Methods and apparatus for the examination of surface temperature distribution|
    US4215562A|1978-04-19|1980-08-05|Basov Vladislav V|Method for detecting surface and subsurface flaws in rolled products|
    US4247306A|1979-01-17|1981-01-27|Elkem Spigerverket A/S|Detection of flaws in metal members|JPH01239443A|1988-03-18|1989-09-25|Nkk Corp|Method and device for detecting defect in external surface of tube|
    NO166424C|1989-01-10|1991-07-17|Elkem Technology|PROCEDURE FOR THE DETECTION OF SURFACE CRACKS IN METAL TOPICS.|
    DE69419978T2|1993-05-17|1999-12-09|Daido Steel Co Ltd|Method and device for detecting defects|
    US5934805A|1993-05-17|1999-08-10|Daido Tokushuko Kabushika Kaisha|Method and an apparatus for flaw detection|
    AU692183B2|1994-11-09|1998-06-04|Daido Tokushuko Kabushiki Kaisha|A method and an apparatus for flaw detection|
    ES2108616B1|1994-11-14|1998-07-01|Daido Steel Co Ltd|METHOD AND APPARATUS FOR THE DETECTION OF DEFECTS.|
    GB2340224B|1998-08-01|2001-06-06|British Aerospace|Thermographic wiring inspection|
    KR100573562B1|2001-12-24|2006-04-25|주식회사 포스코|The edge crack detector using heating equipment in the steel making process|
    DE102004011843A1|2004-03-09|2005-09-29|Db Netz Ag|Method and device for detecting faults in railway tracks|
    WO2008071204A1|2006-12-12|2008-06-19|Montanuniversität Leoben|System and method for the defect analysis of workpieces|
    US8204294B2|2009-11-25|2012-06-19|Toyota Motor Engineering & Manufacturing North America, Inc.|Systems and methods for detecting defects in coatings utilizing color-based thermal mismatch|
    DE102011010066B4|2011-02-02|2015-06-25|INPRO Innovationsgesellschaft für fortgeschrittene Produktionssysteme in der Fahrzeugindustrie mbH|A method of non-destructive testing of a component made of a material having an emission coefficient considerably less than 1, such as an automotive aluminum, stainless steel or galvanized sheet steel component, for internal and / or surface defects|
    DE102012024367B4|2012-12-09|2015-06-25|INPRO Innovationsgesellschaft für fortgeschrittene Produktionssysteme in der Fahrzeugindustrie mbH|Method and plant for non-destructive thermographic testing of components such as automotive components for internal and / or surface defects while increasing the surface emissivity of the components|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    NO813705A|NO149793C|1981-11-03|1981-11-03|PROCEDURE FOR SEWING ROLLING SUBJECTS|
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