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公开(公告)号：US20190210159A1
公开(公告)日：2019-07-11
申请号：US16311710
申请日：2017-03-15
申请人： HITACHI, LTD.
CPC分类号： B23K31/125 , B23K11/0026 , B23K11/25 , B23K31/00 , B23K2101/006 , B23K2103/04 , G01J5/08 , G01N27/20
摘要： To improve quality control of welding, there is included in resistance welding: a magnetic field measuring unit (205) disposed around a welded part and configured to measure a local current at the welded part; a high-speed camera (202) configured to capture an image for measuring local temperature at the welded part from variation of luminance of emission by capturing light emission state of the welded part; a comparison determination unit (106) configured to determine whether or not at least one of current information and temperature information has an abnormal value by comparing the current information calculated based on magnetic field information acquired from the magnetic field measuring unit with past current information and comparing the temperature information measured from an image of the high-speed camera (202) with past temperature information.
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公开(公告)号：US20210063316A1
公开(公告)日：2021-03-04
申请号：US16644155
申请日：2018-08-30
发明人： Hisashi ENDOU , Masanori MIYAGI , Hiroshi YOSHIKAWA , Toshihiro YAMADA , Nobuhiro KAKENO , Yasunori HAMA
IPC分类号： G01N21/892 , G01N25/72 , B23K31/12
摘要： The disclosure provides a joining process line monitoring system capable of preventing joining quality deterioration and operation delay. A joining process line monitoring system 100 includes a joining phenomenon data acquisition part 111 configured to acquire a joining phenomenon of a joining subject member as phenomenon data; an operation state data acquisition part 112 configured to acquire a joining operation state of the joining subject member as operation state data; an evaluation data calculation unit 120 configured to perform time synchronization of the acquired phenomenon data and the acquired operation state data, and associate the acquired phenomenon data and the acquired operation state data with each joining operation location, so as to calculate evaluation data; a difference data extraction unit 130 configured to extract a difference between the evaluation data and reference data set in advance as difference data; an abnormal location determination unit 140 that determines that a portion having a large difference from the joining phenomenon is an abnormal location; and a presentation unit 150 configured to present the abnormal location of a joining portion of the joining subject member based on the difference data.
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公开(公告)号：US20180321162A1
公开(公告)日：2018-11-08
申请号：US16032371
申请日：2018-07-11
申请人： Hitachi, Ltd.
CPC分类号： G01N21/8806 , B23K31/125 , B23K37/04 , G01N2201/1053
摘要： There are provided a welding monitoring system which can multidimensionally monitor a welding portion with high accuracy and a monitoring method thereof, by using a relatively simple configuration.There is provided a welding monitoring system which monitors a subject, including: a mechanical portion; and an imaging portion, in which the mechanical portion includes a transport arm which transports the subject, a subject holding portion which holds the subject, and an energizing device which causes welding with respect to the subject to be performed, and in which the imaging portion includes imaging means for obtaining imaging data of the subject, a data recording portion which records the imaging data, an analyzing portion which extracts predetermined characteristics from the imaging data, a comparison determination portion which compares the extracted characteristics and normal characteristics to each other to determine the presence or absence of abnormality, and a determination result output portion which outputs a determination result by the comparison determination portion.
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公开(公告)号：US20220057789A1
公开(公告)日：2022-02-24
申请号：US17413417
申请日：2020-01-30
申请人： HITACHI, LTD.
IPC分类号： G05B19/418
摘要： A manufacturing monitoring assistance device includes: a model creation unit creating a computation model when a product as a sample is normal, based on a three-dimensional form acquired from the product; a simulation unit creating a corrective computation model when the product is abnormal, by adding a sample of an abnormal portion in the product to the created computation model, and performing a simulation on each of the computation model and the corrective computation model; and a monitoring method determination unit determining a method for monitoring a manufacturing process for the product, based on an abnormality index being a difference between an output from a sensor as a result of the simulation performed on the computation model and an output from a sensor as a result of the simulation performed on the corrective computation model, and causing an output device to display the determined method and the abnormality index.
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公开(公告)号：US20210063255A1
公开(公告)日：2021-03-04
申请号：US17008838
申请日：2020-09-01
申请人： Hitachi, Ltd.
IPC分类号： G01L1/12 , G01R33/032 , G01L1/22
摘要： A stress distribution measurement device includes: a first magnetostrictive sensor and a second magnetostrictive sensor each including an excitation coil that excites AC magnetism in a measurement target using alternating current, and a detection coil to which alternating current is induced due to the AC magnetism flowing in the measurement target; an excitation circuit that applies a first excitation voltage to the excitation coil of the first magnetostrictive sensor and applies a second excitation voltage to the excitation coil of the second magnetostrictive sensor, the second excitation voltage having a phase or a waveform different from the first excitation voltage; and a detection circuit that includes a first detector that performs synchronous detection of current flowing in the detection coil of the first magnetostrictive sensor based on the first excitation voltage and a second detector that performs synchronous detection of current flowing in the detection coil of the second magnetostrictive sensor based on the second excitation voltage.
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公开(公告)号：US20180113077A1
公开(公告)日：2018-04-26
申请号：US15786770
申请日：2017-10-18
申请人： Hitachi, Ltd.
摘要： There are provided a welding monitoring system which can multidimensionally monitor a welding portion with high accuracy and a monitoring method thereof, by using a relatively simple configuration.There is provided a welding monitoring system which monitors a subject, including: a mechanical portion; and an imaging portion, in which the mechanical portion includes a transport arm which transports the subject, a subject holding portion which holds the subject, and an energizing device which causes welding with respect to the subject to be performed, and in which the imaging portion includes imaging means for obtaining imaging data of the subject, a data recording portion which records the imaging data, an analyzing portion which extracts predetermined characteristics from the imaging data, a comparison determination portion which compares the extracted characteristics and normal characteristics to each other to determine the presence or absence of abnormality, and a determination result output portion which outputs a determination result by the comparison determination portion.
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