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1. 发明专利

JP2002257789A LEAKAGE FLUX DETECTING DEVICE 失效
公开(公告)号：JP2002257789A
公开(公告)日：2002-09-11
申请号：JP2001055486
申请日：2001-02-28
申请人： NIPPON KOKAN KK , N D R KK
发明人： KATO HIROHARU , NAGAMUNE AKIO , MURAKAMI YOSHIHIRO
IPC分类号： G01N27/83
摘要： PROBLEM TO BE SOLVED: To provide a device for detecting a magnetic flux resulted from a minute defect present in a material to be inspected or a minute iron powder or the like included in the material to be inspected with high sensitivity and high S/N. SOLUTION: A magnet 2 for magnetizing the material to be inspected 1 is provided in the vicinity of the material 1 traveling an arrowed direction, and the magnetic flux from its magnetic poles N and S magnetize the material 1 to a value close to a saturated magnetic flux density. Three magnetic sensors S1, S2 and S3 are provided at equal intervals in the middle of the magnetic poles N and S. In (B), three probe coils are used as the magnetic sensors and connected so that S1 and S3 at both ends of the three probe coils are in the same phase and the central S2 in the reverse phase, and the connecting wire is connected to a preamplifier 3. S1 and S3 have the same number of turns, and the number of turns of S2 is set to two times this number of turns. The voltage corresponding to the difference between the sum of leakage the magnetic fluxes detected by the magnetic sensors S1 and S3 and two times the magnetic flux detected by the magnetic sensor S2 is inputted to the preamplifier 3 and amplified.

2. 发明专利

JP2000275219A LEAKAGE FLUX FLAW DETECTING METHOD 失效
公开(公告)号：JP2000275219A
公开(公告)日：2000-10-06
申请号：JP7733299
申请日：1999-03-23
申请人： NIPPON KOKAN KK
发明人： KATO HIROHARU , YOTSUTSUJI JUNICHI , NAGAMUNE AKIO
IPC分类号： G01N27/83
摘要： PROBLEM TO BE SOLVED: To provide a leakage flux flaw detecting method for a ferromagnetic metal specimen capable of detecting a fine flaw with high detection precision. SOLUTION: A magnetic flaw detecting device 4 is installed along a conveyance path of a steel sheet 1. This magnetic flaw detecting device 4 is mainly constituted of magnetizers 5a, 5b, magnetic sensors 6a, 6b and a signal processor 8. The magnetizers 5a, 5b are excited by an AC power supply 7a(frequency f1) and an AC power supply 7b(frequency f2) respectively, where f1

3. 发明专利

JP2001296280A CHARACTERISTIC MEASURING METHOD FOR STRIP-SHAPED OBJECT 失效
公开(公告)号：JP2001296280A
公开(公告)日：2001-10-26
申请号：JP2000116095
申请日：2000-04-18
申请人： NIPPON KOKAN KK
发明人： KATO HIROHARU , NAGAMUNE AKIO
IPC分类号： G01N27/90
摘要： PROBLEM TO BE SOLVED: To provide a characteristic measuring method of a strip, capable of compensating the influence of roll eccentricity or material near the roll surface. SOLUTION: A sensor (measuring device) 2 is arranged, facing the surface of the strip 1 running on a manufacturing line or an inspection line. A measurement signal is obtained by the sensor 2 and a sensor electronic circuit 3 and transmitted to a data processing device 6, while a roll 4 is installed on a side opposite to the sensor 2 across the strip 1 so as to be rotated in accordance with running of the strip 1 in contact with the strip 1. The rotation angle position of the roll 4 is transmitted to the data processing device 6 by a roll rotation position detection device (encoder) 5, and collection and processing of a signal synchronized with a rotation frequency of the roll are executed, together with the measurement signal from the sensor electronic circuit 3, to thereby obtain the final measurement value.

4. 发明专利

JP2001228120A METHOD FOR Si CONCENTRATION MEASUREMENT OF STEEL PRODUCT 失效
公开(公告)号：JP2001228120A
公开(公告)日：2001-08-24
申请号：JP2000041523
申请日：2000-02-18
申请人： NIPPON KOKAN KK
发明人： KATO HIROHARU , NAGAMUNE AKIO
IPC分类号： G01N27/90 , G01N33/20
摘要： PROBLEM TO BE SOLVED: To provide a method of precisely measuring the Si concentration of a steel product in no contact manner by improving a conventional eddy current process with insufficient measuring precision. SOLUTION: The relation between the set of a DC magnetizer 3 and the differential magnetic permeability of a steel product to be measured 1 is preliminarily examined, and the DC magnetizer 3 is set by a magnetic force controller 4 so as to have a certain fixed differential magnetic permeability in eddy current measurement. Prior to the measurement of the steel product with unknown Si concentration, a calibration curve for determining Si concentration from a sensor output in a differential magnetic permeability used for the measurement is formed by use of a sample with known Si concentration. In the measurement of the unknown Si concentration, the DC magnetizer is set by the magnetic force controller 4 so that the steel product to be measured 1 has a prescribed differential magnetic permeability, and the output of an eddy current sensor 2 is read by an eddy current sensor electronic circuit 5. The Si concentration is determined from the output value by use of the preliminarily formed calibration curve.

5. 发明专利

JP2861598B2 失效
公开(公告)号：JP2861598B2
公开(公告)日：1999-02-24
申请号：JP4442692
申请日：1992-03-02
申请人： NIPPON KOKAN KK
发明人： FUKUDA YOSHINORI , KATO HIROHARU , TANABE HIDEYA , YOSHIKAWA HIROYASU , IWATA TOSHIKAZU , AKYOSHI TAKANORI
IPC分类号： B05C9/10 , B05D3/00 , B05D7/14 , G01B15/02

6. 发明专利

JP2001296277A MAGNETIC FLAW DETECTION METHOD 失效
公开(公告)号：JP2001296277A
公开(公告)日：2001-10-26
申请号：JP2000111614
申请日：2000-04-13
申请人： NIPPON KOKAN KK
发明人： YOTSUTSUJI JUNICHI , KATO HIROHARU , NAGAMUNE AKIO
IPC分类号： G01N27/83
摘要： PROBLEM TO BE SOLVED: To provide a magnetic flaw detection method, capable of satisfactorily detecting a flaw with S/N ratio, even if an electrical noise is generated or when something other than the defect exerting an influence on a leakage flux exists. SOLUTION: A signal of a magnetic sensor 5a is expressed as V(a), and a signal of a magnetic sensor 5b is expressed as V(b), and respective data are accumulated as much as the moving distance of a thin steel plate 1, corresponding to 1 m×1 m portion. Then, RMSs of the signals in the range are obtained and expressed as Ra, Rb respectively. As Ra and Rb are RMSs of the signals in a wide range, they are supposed to show the mean value of the surface roughness of the thin steel plate 1. Therefore, the signals of the surface roughness cancellation are realized by normalizing the signals of V(a) and V(b) by Ra and Rb and subtracting each other. Namely, V(t) is obtained in each channel by the equation V(t)=Va(t)-V(b)*Ra/Rb, and the range where V(t) exceeds a prescribed threshold is extracted, to thereby extract a defect expectation region D. Then, the defect is determined, based on the width and the length of the defect expectation region D.

7. 发明专利

JP2000227419A LEAKAGE FLUX INSPECTION 失效
公开(公告)号：JP2000227419A
公开(公告)日：2000-08-15
申请号：JP2997799
申请日：1999-02-08
申请人： NIPPON KOKAN KK
发明人： KATO HIROHARU , NAGAMUNE AKIO , YOTSUTSUJI JUNICHI
IPC分类号： G01N27/83
摘要： PROBLEM TO BE SOLVED: To allow defect detection with a high S/N ratio without using plural magnetizers, and without adding a complicated function. SOLUTION: A magnetic inspection equipment 4 is composed of a magnetizer 5 for impressing a magnetic field to a running steel plate 1, magnetic sensors 6a, 6b arranged in a position opposed to the magnetizer 5 to sandwich the steel plate 1, and a signal processor 7 for detecting a defect 8 in the inside or surface of the steel plate 1 based on detection signals from the sensors 6a, 6b. The magnetic sensor 6a is provided in a center position of the magnetizer 5, and detects a leak magnetic flux under a strongly magnetized condition. The magnetic sensor 6b is provided in a position apart from the center position of the magnetizer 5, and detects a leak magnetic flux under a weakly magnetized condition. A noise component contained in two signals in common from the sensors 6a, 6b is cancelled by operating the both signals, so as to realize defect detection excellent is an S/N ratio.

8. 发明专利

JP2000227418A LEAKAGE FLUX INSPECTION 失效
公开(公告)号：JP2000227418A
公开(公告)日：2000-08-15
申请号：JP2978299
申请日：1999-02-08
申请人： NIPPON KOKAN KK
发明人： KATO HIROHARU , YOTSUTSUJI JUNICHI , NAGAMUNE AKIO
IPC分类号： G01N27/83
摘要： PROBLEM TO BE SOLVED: To provide a leakage flux inspecting method for a ferromagnetic metal specimen capable of detecting even a micro defect, with high detection precision. SOLUTION: A magnetic inspection equipment 4 is provided along a conveying passage for a steel plate 1. The equipment 4 is composed mainly of magnetizers 5a, 5b, magnetic sensors 6a, 6b, and a signal processor 7. The sensor 6a measures a leak magnetic flux from the steel plate 1 in a condition magnetized by the magnetizer 5a. The sensor 6b measures a leak magnetic flux from the steel plate 1 in a condition magnetized by the magnetizer 5b. The signal processor 7 operates fellow magnetic signals in the same position of the steel plate 1 detected by the sensors 6a, 6b, so as to reduce noise magnetic fluxes. A defect signal is thereby intensified reletively to enhance an S/N ratio.

9. 发明专利

JP2002143924A MAGNETIC MARKING METHOD OF STEEL STRIP, READING METHOD OF MAGNETIC MARK OF STEEL STRIP AND STEEL STRIP MANETICALLY MARKED 失效
公开(公告)号：JP2002143924A
公开(公告)日：2002-05-21
申请号：JP2000337145
申请日：2000-11-06
申请人： NIPPON KOKAN KK
发明人： KATO HIROHARU , NAGAMUNE AKIO
IPC分类号： B21C51/00
摘要： PROBLEM TO BE SOLVED: To provide a magnetic marking method in which information is hardly erased in a rolling process accompanying light rolling reduction and in other treatment processes. SOLUTION: A magnetic marking 2 is imparted by magnetizing a whole section in the width direction of a steel strip 1 along a width direction. By this method, magnetic poles having different magnetic polarities are formed at both edges. In this case, the magnetization is conducted not in a localized section but over the whole width direction, thus, the magnetization is hardly subjected to deterioration.

10. 发明专利

JP2001272378A MATERIAL CHARACTERISTICS MEASUREMENT METHOD, TRANSFORMATION STATE MEASUREMENT METHOD, MATERIAL CHARACTERISTICS MEASUREMENT DEVICE, AND TRANSFORMATION STATE MEASUREMENT DEVICE FOR MAGNETIC MATERIAL 失效
公开(公告)号：JP2001272378A
公开(公告)日：2001-10-05
申请号：JP2001003788
申请日：2001-01-11
申请人： NIPPON KOKAN KK
发明人： KATO HIROHARU , NAGAMUNE AKIO , FUKUDA YOSHINORI
IPC分类号： G01R33/16 , G01N27/72 , G01N33/20
摘要： PROBLEM TO BE SOLVED: To provide a material characteristics measurement method for a magnetic material which is unaffected by a crystal grain diameter, a solid solution amount, a deposition amount, or dislocation density of a measured material. SOLUTION: A measured steel plate 1 is magnetized with direct current to a rotating magnetized region by means of a direct current magnetizing device 2 and a direct current magnetizing coil 6. An alternating current magnetic field is added to the measured steel plate 1, by means of an alternating current magnetizing device 3 and an alternating current magnetizing coil 7. A magnetic core 5 is used is common for direct current magnetization and alternating current magnetization. By means of an alternating current magnetic field detector 4, an alternating current magnetic field in the surface direction on the surface of the measured steel plate 1 is detected. By means of a lock-in amplifier 8, the detected alternating current magnetic filed signal and the alternating current magnetized signal are detected synchronously and noise constituents are eliminated, and consequently, intensity of the alternating current magnetic field is detected with high sensitivity. From the detected alternating current magnetic signal intensity, material characteristics are computed and found in a signal processor 9.

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