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1. 发明专利

JPH06137921A METHOD FOR DETECTING MOLTEN METAL LEVEL 失效
公开(公告)号：JPH06137921A
公开(公告)日：1994-05-20
申请号：JP28728992
申请日：1992-10-26
申请人： NIPPON STEEL CORP
发明人： SADAKI ATSUSHI , TANAKA KEIHACHIRO , MOTOMURA MASAKI , TOKUDA ATSUHIRO , MORIKAGE TSUZUKU , SUNAKAWA AKIRA
IPC分类号： G01F23/26
摘要： PURPOSE:To restrain discontinuity due to switching of detector by disposing a plurality of sets of detectors while overlapping the detection ranges, at the fringe regions thereof, in the direction of level variation of molten metal thereby correcting aging of the detector on-line. CONSTITUTION:A detector comprises transmission coils 4a-4e, receiving coils 7a-7e, BPFs 8a-8e, synchronous rectifiers 9a-9e, and LPFs 10a-10e. If molten metal 1 is filled between the transmission coil 4a and the receiving coil 7a, eddy current is induced in the molten metal 1 by a part of alternating flux transmitted through a mold 2 when the flux passes through the molten metal 1. In this regard, voltage induced in the transmission coil 7a corresponds to the molten metal level filled between the coils 4a, 7a. In order to detect molten level range corresponding to the output voltage of a detector on the low molten level side basing on the output voltage of a detector on the high molten level side between adjacent detectors, respective measuring ranges are overlapped at the fringe regions thereof.

2. 发明专利

JPH04187348A INSTRUMENT FOR MEASURING DISTRIBUTION OF COATING FILM THICKNESS IN TWIN BELT CASTER 失效
公开(公告)号：JPH04187348A
公开(公告)日：1992-07-06
申请号：JP31280290
申请日：1990-11-20
申请人： NIPPON STEEL CORP
发明人： NAGANUMA YOICHI , MOTOMURA MASAKI , TANAKA KEIHACHIRO , TOKUDA ATSUHIRO
IPC分类号： B22D11/06 , B22D11/16
摘要： PURPOSE:To measure the distribution of carbon film thickness during operation by utilizing heat insulating effect in the coasting film and measuring the distribution of surface temp. in non-contact condition. CONSTITUTION:A casting belt 10 applying the coating film is heated and dried with a heater 18. Surface temp. of the casting belt 10 and distribution thereof are masured in non-contact condition with an infrared camera 14. The surface temp. shows the temp. according to the thickness of coating film with the heat insulating effect of the coating film. By measuring and storing the relation between the surface temp. and the film thickness in advance, the distribution of film thickness in every moments can be displayed and outputted. By this method, the distribution of film thickness can be always observed in on-line and the pressures of plural coating nozzles 20 are controlled so as to obtain uniform film thickness, and the development of crack, surface fold and flaw in a strip can be prevented.

3. 发明专利

JPH03138536A METHOD FOR DETECTING TOP SURFACE POSITION OF MOLTEN METAL 失效
公开(公告)号：JPH03138536A
公开(公告)日：1991-06-12
申请号：JP27766789
申请日：1989-10-25
申请人： NIPPON STEEL CORP
发明人： NAGANUMA YOICHI , MOTOMURA MASAKI
IPC分类号： G01F23/26
摘要： PURPOSE:To enable highly accurate detection by transmitting alternating magnetic flux, which is produced with the alternating voltage of a transmitting coil and a receiving coil arranged on both outsides of a container in opposite each other, through the molten metal in the container, and finding the product of the sine (cosine) value of the phase difference between its induced signal and the alternating voltage, and the alternating voltage value. CONSTITUTION:The alternating magnetic flux is produced in the right vertical direction of a coil 4 with an AC power source 5, part of the magnetic flux enters a mold 2 and passes through it partially in its vertical direction, and further part of it passes molten steel 1 or air 6 to enter a mold 3 and passes through it vertically, so that furthermore part of it reaches the receiving coil 7 to generate an induced voltage signal. The magnetic flux becomes extremely small with an eddy current at the time of the passage of the magnetic flux when the container is filled with molten steel 1, becomes larger when empty, and varies continuously with the position of the top surface of the molten steel 1 when the top surface is close to the coils 4 and 7. The impedance variation of the coil 7 based upon the level of the eddy current is measured as a phase shift and the phase deviation is further measured to take a highly accurate measurement with good response without being affected by the variation in power source voltage value.

4. 发明专利

JPH03122526A DETECTION OF LEVEL OF MOLTEN METAL 失效
公开(公告)号：JPH03122526A
公开(公告)日：1991-05-24
申请号：JP26069089
申请日：1989-10-05
申请人： NIPPON STEEL CORP
发明人： NAGANUMA YOICHI , MOTOMURA MASAKI
IPC分类号： G01F23/26
摘要： PURPOSE:To remove a delay in a time of detection, to increase responsiveness and to make measurement highly precise by a method wherein a change in the impedance of a receiving coil caused by an amplitude of an eddy current generated in a molten metal itself is measured as a change in a phase. CONSTITUTION:When a molten metal 1 is filled up in molds 2, 3 and a part of a magnetic flux transmitted through the mold 2 passes through the metal 1, an eddy current is generated in the metal 1 and the impedance of a receiving coil 7 changes. Then a phase shift occurs, compared with a case when only air 6 is present, the metal 1 being absent, in the molds 2, 3, and the value of this phase shift is outputted as a voltage value by a phase difference detector 9. In the case when a melt level is positioned near transmitting and receiving coils, the output voltage value of the detector 9 changes in a reverse order and continuously. By measuring this phase shift, accordingly, the position of the level of the molten metal in the vicinity of the transmitting and receiving coils 4 and 7 can be detected.

5. 发明专利

JPS5635797A MEASURING METHOD FOR BUILTTUP QUANTITY OF CHEMICAL CONVERSION COATING IN CONTINUOUS PLATING OPERATION 失效
公开(公告)号：JPS5635797A
公开(公告)日：1981-04-08
申请号：JP11007279
申请日：1979-08-29
申请人： NIPPON STEEL CORP
发明人： YAMAMOTO HIROSHI , MOTOMURA MASAKI
IPC分类号： C25D11/38 , C25D21/12 , G01B21/02
摘要： PURPOSE:To make possible high precision on-line measurement of film built-up, by measuring the film built-up by the calculation using the breadth, traveling speed of belt-shaped steel sheet, and plating electric current in continuous plating operation. CONSTITUTION:This method relates to the on-line measurement of built-up of chemical conversion coating. At first, an exponential function of the quantity of electricity for each bath is determined, and it is corrected by a coefficient corresponding to each film building-up efficiency. Then total sum of these corrected value is calculated. In addition, film built-up is measured indirectly at a high precision by addition with a constant term. That is, the built-up of chemically conversion coating is calculated by the formula, where Ccr is measured built-up, Vl is line speed, W is the breadth of steel sheet, I1-In are electric currents of respective baths, K1-Kn are building-up efficiency constants for respective baths, m1-mn are exponential constants for curve approximation of respective baths, C is a constant corresponding to the building-up in electroless treatment.

6. 发明专利

JPS5528312A PLATING CURRENT CONTROL DEVICE FOR CONTINUOUS ELECTROPLATING 失效
公开(公告)号：JPS5528312A
公开(公告)日：1980-02-28
申请号：JP9932178
申请日：1978-08-15
申请人： NIPPON STEEL CORP
发明人： MOTOMURA MASAKI , YAMAMOTO HIROSHI
IPC分类号： C25D21/12 , G05F1/10
摘要： PURPOSE:To prevent excess flow of plating current into each pass securely and automatically, by interposingly providing a plating current saturation control circuit between plating current setting circuit and plating current generating circuit in each pass. CONSTITUTION:In a plating current control device of electric plating line having two or more plating passes, a plating current saturation limiting circuit 10' is provided between a plating current setting circuit 5 and a plating current generating circuit 6. When the output 15 of upper saturation limit element 10 increases and the plating current of the plating current generating circuit 6 increases to produce excess output in a comparator 9, the contact is opened. Thus, the output 15 of the upper saturation limit element 10 has the saturation characteristic. Therefore, the excess flow of plating current into each pass may be effectively prevented.

7. 发明专利

JPS522756A SYSTEM FOR MEASURING THICKNESS OF SURFACE COATED MEMBRANE 失效
公开(公告)号：JPS522756A
公开(公告)日：1977-01-10
申请号：JP7926175
申请日：1975-06-25
申请人： NIPPON STEEL CORP
发明人： YAMAMOTO HIROSHI , SHIKI SHIGENORI , MOTOMURA MASAKI
IPC分类号： G01B11/06 , G01B11/26
摘要： PURPOSE:To provide a system for measuring thickness of coated membrane, which surface is penetrated with light, by measuring the phase angle against a reflected ray with a high performance.

8. 发明专利

JPH0777499A DETECTING METHOD FOR WHITE RUST SECTION AREA RATIO OF STEEL SHEET 失效
公开(公告)号：JPH0777499A
公开(公告)日：1995-03-20
申请号：JP24620193
申请日：1993-09-07
申请人： NIPPON STEEL CORP , NITTETSU ERETSUKUSU KK
发明人： TANIMURA KOJI , MOTOMURA MASAKI
IPC分类号： G01B11/28 , G01B11/30 , G01N21/89 , G01N21/892
摘要： PURPOSE:To provide the method for detecting the white rust section area of a specimen under corrosion tests such as a salt water spray test and a cycle corrosion test. CONSTITUTION:This detecting device is provided with a color television camera 3 photographing the surface of a steel sheet 2, a Y/C separator 4 separating the color image signal of the color television camera 3 into the Y signal and C signal, a rectifier 5 rectifying the C signal into DC pulses having the frequency of 3.58MHz, a low-pass filter 6 smoothing the DC pulse signal into an image signal, a binarizing device 9 setting the image signals of a fixed level or below to [0] and the other signals to [1] among the output image signals and the Y image signal outputs of the Y/C separator 4, an AND gate 10 performing the AND operation, an image memory 11 temporarily recording the output image signals of 0 and [1] of the AND gate 10, and an arithmetic device 12 counting the number of picture elements of the portion stored as [1] in the image memory 11 and calculating {number of picture elements of portions recorded as 1/(number of picture elements recorded as [1+] number of picture elements recorded as 0)}X100.

9. 发明专利

JPH04187353A INSTRUMENT FOR MEASURING ECCENTRIC QUANTITY AND DEVICE FOR CORRECTING ECCENTRICITY IN CASTING NOZZLE OF CONTINUOUS CASTER 失效
公开(公告)号：JPH04187353A
公开(公告)日：1992-07-06
申请号：JP31280490
申请日：1990-11-20
申请人： NIPPON STEEL CORP
发明人： NAGANUMA YOICHI , MOTOMURA MASAKI , TANAKA KEIHACHIRO , TOKUDA ATSUHIRO
IPC分类号： B22D11/10 , B22D11/16 , B22D41/56
摘要： PURPOSE:To improve the quality of a cast slab and to stabilize an operation by calculating coordinates in the intersection of beam cutting line on an image caused by the eccentricity of a nozzle and calculating the eccentric quantity of the nozzle from the coordinates. CONSTITUTION:The beam from an Ar laser 160 is made to linear beam 14 by a columnar lens 162 and a casting lens 10 is irradiated with this beam. By irradiation of this beam 14, the beam cutting line 12 is formed on two outside surfaces 100, 102 of the casting lens 10. A CCD camera 180 is set to position capable of photographing this beam cutting line 12 through an interference filter 184. An image signal outputted from the CCD camera 180 is stored in an image memory 186 and read and analyzed successively from a computer 200. The computer 200 reads image signal from an image memory 186 and calculates the position of center of gravity of the beam cutting line and decides an equation of the beam cutting line with least square method. By solving the binary simultaneous equations, the coordinates in the intersection are calculated, and the eccentric quantity of nozzle 10 is calculated. Based on this eccentric quantity, the correcting device 260 for nozzle position is shifted.

10. 发明专利

JPH02148311A TEMPERATURE CONTROL METHOD 失效
公开(公告)号：JPH02148311A
公开(公告)日：1990-06-07
申请号：JP30324088
申请日：1988-11-30
申请人： NIPPON STEEL CORP
发明人： MOTOMURA MASAKI
IPC分类号： G05D23/19
摘要： PURPOSE:To perform high-quality temperature control by performing 100% continuous control when a difference to be controlled is large and intermittent ON/OFF control by using negative feedback produced by a time delaying element when the difference becomes smaller. CONSTITUTION:In case the temperature value of an object 4 to be controlled is extremely lower than an aimed temperature value, the output of a thermocouple is extremely low even when the output is amplified 3. The output of an adder 1 is positive and a comparator 6 is turned on and outputs a continuous positive output which turns on a heater 7. On the other hand, when the temperature of the object 4 is extremely higher against the aimed temperature value, the output of the thermocouple 5 is extremely high and, accordingly, the output of the adder 1 comes to negative and the heater 7 is disconnected. As the temperature of the object reaches the aimed temperature, the difference between the aimed value and output of the amplifier 3 approaches zero. When the output of the comparator 6 is positive, the output of a time delaying element 8 comes to positive after the elapse of time and is inverted to negative by means of positive/negative inversion circuit 2. Therefore, the output of the adder 1 becomes negative from positive and inverts the output value of the comparator 6 and, as a result, the heater 7 is disconnected.

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