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1. 发明专利

JPH07225222A FIBER BREAK DETECTION METHOD FOR CARBON FIBER REINFORCED PLASTIC TUBE 失效
公开(公告)号：JPH07225222A
公开(公告)日：1995-08-22
申请号：JP10163594
申请日：1994-04-15
申请人： NIPPON STEEL CORP , NIPPON STEEL CHEMICAL CO
发明人： KUBOMURA KENJI , ISHIDA TSUGIO , AIKAWA YASUHIRO , SASAKI TAKESHI
IPC分类号： G01N27/90
摘要： PURPOSE:To provide a method for detecting fiber break by using a rectangular excitation coil for making induction current selectively flow in each direction of the reinforced fiber of carbon fabric reinforced plastic tube. CONSTITUTION:Due to an excitation coil 10a wound around the periphery of CFRP (carbon fiber reinforced plastic) tube l. alternating field H takes place in the direction of tube's axis, and thanks to the magnetic field H, induction current i flaws in the axis direction of the tube 1. Diamagnetic field h takes place based on the induction current i, so, the impedance of a detection coil 10b changes. The detection coil 10b is wound along the inside of the excitation coil 10a. Since, in a carbon fiber reinforced plastic, the electric resistance in the direction of carbon fiber is lower than in perpendicular direction by about three digits, the induction current selectively flows in the fiber direction of 0 deg. direction. Therefore, if fiber break exists in that direction, electric resistance will increase, with the result of decrease in the induction current i and Diamagnetic field h, so, from the impedance changes at the detection coil, fabric break is detected.

2. 发明专利

JPH07229875A FLAW INSPECTION DEVICE FOR TUBULAR MEMBER MADE OF CARBON FIBER-REINFORCED PLASTIC 失效
公开(公告)号：JPH07229875A
公开(公告)日：1995-08-29
申请号：JP2064394
申请日：1994-02-17
申请人： NIPPON STEEL CORP , NIPPON STEEL CHEMICAL CO
发明人： ISHIDA TSUGIO , KUBOMURA KENJI , AIKAWA YASUHIRO , NAKANISHI TOMOHIRO
IPC分类号： G01N27/90
摘要： PURPOSE:To provide a device inspecting the breakage of the fibers of a carbon fiber- reinforced plastic tubular product such as a golf shaft or a fishing rod in a non- destructive manner. CONSTITUTION:A plurality of excitation coils 9a-12a selectively allowing an induction current to flow in every direction of the reinforcing fibers of a carbon fiber-reinforced plastic tubular member 1 and a plurality of detection coils 9b-12b forming pairs with respect to the coils 9a-12a are arranged to coil bobbins 9-10 and connected to an eddy current flaw detector 8. The tubular member 1 is attached to a rotary mechanism 3 through a holding part 2 and the rotary mechanism 3 is fixed to a scanning mechanism 4. When an inspection start command is inputted to a computer part 7, the scanning mechanism 4 is operated by the command of the computer part 7 to allow the tubular member 1 to run. The impedance change of the detection coils 9b-12b is converted into voltage by the eddy current flaw detector 8 while the voltage is recorded and displayed on the computer part 7. Next, the tubular member 1 is rotated by a predetermined angle and, thereafter, the same scanning is performed and these operations are repeated until the tubular member 1 makes one revolution and whole surface inspection is automatically executed and an inspection result is displayed.

3. 发明专利

JPH0972884A INSPECTION OF PEEL DEFECT OF CARBON FIBER REINFORCED PLASTIC 失效
公开(公告)号：JPH0972884A
公开(公告)日：1997-03-18
申请号：JP25202895
申请日：1995-09-06
申请人： NIPPON STEEL CORP , NIPPON STEEL CHEMICAL CO
发明人： IZUMIHARA YOSHIICHI , KUBOMURA KENJI , ISHIDA TSUGIO , AIKAWA YASUHIRO
IPC分类号： G01N27/90
摘要： PROBLEM TO BE SOLVED: To detect the peel defect between plies of CFRP(carbon fiber reinforced plastic) having a plurality of plies different in angle of orientation by using an eddy current. SOLUTION: The peel defect between adjacent plies different in a reinforcing fiber direction is detected in CFRP 3 having a plurality of plies different in angle of orientation by measuring the impedance change based on the difference in the fiber contact degree between plies by allowing a current to flow in the fiber direction of the respective plies. An exciting coil 1 for allowing an induced current to selectively flow at every reinforcing direction of carbon fibers is provided so as to measure the impedance change of the coil or the impedance change of the detection coil forming a pair along with the exciting coil 1 and the relative position of a rectangular coil and a defect can be quantitatively detected at a high speed.

4. 发明专利

JPH07167839A INSPECTION COIL FOR ELECTROMAGNETIC INDUCTION FLAW DETECTION AND FLAW DETECTING METHOD 失效
公开(公告)号：JPH07167839A
公开(公告)日：1995-07-04
申请号：JP34351993
申请日：1993-12-14
申请人： NIPPON STEEL CORP
发明人： ISHIDA TSUGIO , KUBOMURA KENJI , AIKAWA YASUHIRO
IPC分类号： G01N27/90
摘要： PURPOSE:To provide an electromagnetic induction flaw detecting method of an anisotropic conductive material (for example, carbon fiber reinforced plastics), etc., by using a rectangular inspection coil for selectively allowing an induction current to flow in a specific direction on a surface of a specimen. CONSTITUTION:A rectangular inspection coil 1 put on a surface of carbon fiber reinforced plastics 4 is connected to an induction current detector 5, the detector 5 allows an alternating current to flow to the inspection coil 1 and therewith converts an impedance change of the coil 1 into a voltage to output, and a recorder 6 records a voltage change. Therefore, where a longitudinal direction of the inspection coil 1 is superposed on the fiber direction (X direction) of 0 deg. of the carbon fiber reinforced plastics 4, the flaw detection of a fiber rupture can be very accurately made, by selectively allowing an induction current to flow in the fiber direction (high conductance direction).

5. 发明专利

JPS5654351A ULTRASONIC HIGH TEMPERATURE ANGLE FLAW DETECTING METHOD 失效
公开(公告)号：JPS5654351A
公开(公告)日：1981-05-14
申请号：JP13108879
申请日：1979-10-11
申请人： NIPPON STEEL CORP
发明人： AIKAWA YASUHIRO , KODAIRA KAZUMARU , NAKAYAMA MASAHISA , UENO RITSU
IPC分类号： G01N29/04
摘要： PURPOSE:To improve SN ratio by erasing the spurious reflecting echo signal from the flaw detection signal. CONSTITUTION:With a probe 2 held not in contact with the test material, a flaw detector is operated and the spurious reflecting echo signal obtained at this time is level-adjusted in an AGC circuit 4, after which it is inputted to a memory circuit 6 by way of an A/D converting circuit 5 and is thereby stored. Thence, the probe 2 is contacted with the test material and the flaw detector is operated. The spurious reflecting echo mixed in the flaw detection signal obtained at this time and the spurious reflecting echo having been stored in the memory circuit 6 are subtracted and erased in a subtractor 7, and the flaw detection signal which is the output of the subtractor 7 is inputted via D/A converting circuit 12 to a monitoring circuit 8.

6. 发明专利

JPS5619982A WELDING METHOD BY ULTRASONIC CONTROL 失效
公开(公告)号：JPS5619982A
公开(公告)日：1981-02-25
申请号：JP9578379
申请日：1979-07-27
申请人： NIPPON STEEL CORP
发明人： KODAIRA KAZUMARU , AIKAWA YASUHIRO , UENO RITSU
IPC分类号： B23K9/095 , B23K9/00 , B23K9/12 , B23K9/127
摘要： PURPOSE:To correct welding conditions based on defect signals and prevent the continued production of weld defects by performing ultrasonic angle beam flaw detection from one or both sides of the weld zone leaving a fixed distance from an electrode wire. CONSTITUTION:In submerged arc welding, the plural ultrasonic angle beam probes 1 on both sides of the weld line scan on groove faces 2 cooperatively with a welding torch at all times during welding, in the position apart by a distance l from a preceding welding wire 4 and on the line orghogonal to the weld line. If at this time lack of fusion 6 occurs on the groove faces, a defect signal 8 is outputted to operate a welding control unit which in turn moves the wire 4 to the signal generating side until the defect signal 8 annihilates. In addition, if lack of penetration 11 occurs on the under surface of root in the case of using one angle beam probe 1 on one side of the weld line, an output signal 9 is inputted to the welding control unit so that the welding current is increased or the welding speed is decreased, whereby normal welding is accomplished.

7. 发明专利

JPS54155087A METALLIC WEDGE FOR ULTRASONICCWAVE HIGH TEMPERATURE SKEW ANGLE FLAW DETECTION 失效
公开(公告)号：JPS54155087A
公开(公告)日：1979-12-06
申请号：JP6308578
申请日：1978-05-26
申请人： NIPPON STEEL CORP
发明人： AIKAWA YASUHIRO
IPC分类号： G01N29/24 , G01N29/04
摘要： PURPOSE:To obtain an excellent SN ratio, by eliminating reflected eachoes in a metallic wedge for skew angle flaw detection causing noises by joining a sound absorbing machine to a surface being subject to reflected echoes from a base of said wedge. CONSTITUTION:Metallic sound absorbing materials 2, which are constituted with materials similar to or of the same kind as a metallic wedge 1 and to which solid minute particles are uniformly addition dispersed, and joined to the wedge 1 by means of welding, etc., and housed in a cooling box 10 for water-cooling, and a trembler 4 is mounted to one end of the wedge 1. Ultrasonic-wave beams 7 oscillated from the trembler 4 are projected into materials 6 to be tested through a contact medium 5, but a SN ratio remarkably improves becuase reflected echoes 8 from a base of the wedge are guided into the sound absorbing materials 2 at that time, are dispersion absorbed by solid minute particles, approximately become extinct and hardly return to the trembler 4 again.

8. 发明专利

JPH05223641A SPECIFIED COLOR DETECTOR 失效
公开(公告)号：JPH05223641A
公开(公告)日：1993-08-31
申请号：JP2819992
申请日：1992-02-14
申请人： NIPPON STEEL CORP
发明人： MOTOMURA MASAKI , AIKAWA YASUHIRO
IPC分类号： B07C5/342 , G01J3/50
摘要： PURPOSE:To detect material alone of a specified color such as copper with an inexpensive device which can be utilized for recycling. CONSTITUTION:I and Q signals are extracted from an NTSC signal to be outputted from a color camera 10 to determine a Q/I ratio. It is judged with a window comparator 60 in a binary coded manner whether the ratio is in a range predetermined or not. A monitor TV is connected to enable the adjustment of a threshold. When the area detected is large, a recovery indication signal is outputted.

9. 发明专利

JPH05131175A METHOD FOR DISCRIMINATING AND SORTING COPPER COIL IN SHREDDER SCRAP 失效
公开(公告)号：JPH05131175A
公开(公告)日：1993-05-28
申请号：JP32140191
申请日：1991-11-08
申请人： NIPPON STEEL CORP
发明人： AIKAWA YASUHIRO , NAGANUMA YOICHI , MOTOMURA MASAKI , SAKAKIBARA MICHIAKI
IPC分类号： B07C5/342
摘要： PURPOSE:To automatically discriminate and sort a copper coil causing a problem of quality deterioration when iron scrap obtained by classifying treatment is reutilized as an iron source. CONSTITUTION:A conveyor line 6 feeding shredder scrap 7 is illuminated by a non-directional white illuminator 1 and the illuminated shredder scrap 7 is photographed by a color TV camera 2 and, on the basis of the photographing signal thereof, the enamel painting color bonded to the surface of a copper coil is extracted. When the value of the extraction signal of the enamel painting color is a preset threshold value or more, it is discriminated that the copper coil is present on the conveyor line 6 and the position of the coil is specified to generate a sorting signal and the scrap pieces containing the copper coil within a specific region are automatically discharged out of the conveyor line 6 on the basis of the sorting signal to discriminate and sort iron scrap from the copper coil.

10. 发明专利

JPS6232355A EDDY CURRENT FLAW INSPECTOR 失效
公开(公告)号：JPS6232355A
公开(公告)日：1987-02-12
申请号：JP17214985
申请日：1985-08-05
申请人： NIPPON STEEL CORP
发明人： MASUKO YORYO , AIKAWA YASUHIRO , KIMURA AKIRA
IPC分类号： G01N27/90
摘要： PURPOSE:To execute an eddy current flaw inspection by a high detecting capacity, by using a long through-coil for an excitation, and placing plural pieces of air-core detecting coils so as to be opposed in the outside periphery of a body to be inspected. CONSTITUTION:A sine wave voltage generated by an oscillator 10 is supplied to the exciting coil 5 of a detecting part. The coil 5 is a solenoid coil being long enough, therefore, a roughly uniform alternating magnetic field is formed in its inside. Also, to the surface and the surface layer of a body to be inspected 1, the eddy current of the opposite direction flows in the same direction as a current flowing in the coil 5 so as to negate its alternating magnetic field. Moreover, if a defect exists on the surface of the body to be inspected 1, the eddy current goes round the defect and flows, therefore, the magnetic field comes to have a vertical component. As a result, a magnetic field by this defect and a pancake coil 6 are interlinked, and a voltage is induced in the coil 6. This induced voltage is brought to a synchronous detection by a synchronous detector 14 through an amplifying circuit 12 by referring to a phase which has phase-shifted a phase of the oscillator 10 by a phase shifter 13. Also, a high frequency noise component is cut by a band-pass filter 15, and a defect is detected by a pulse height discriminating circuit 16.

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