会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 3. 发明专利
    • BRPI0717360A2
    • 2011-11-08
    • BRPI0717360
    • 2007-10-16
    • NIPPON STEEL CORP
    • HAMAMURA HIDEYUKIIWATA KEIJISAKAI TATSUHIKO
    • C21D8/12H01F1/16
    • The present invention provides grain-oriented electrical sheet more superior in watt loss compared with the past by dividing the watt loss of grain-oriented electrical sheet introducing strain by irradiation of a laser beam etc. into hysteresis loss and eddy current loss and, in particular from the viewpoint of the eddy current loss, quantitatively suitably controlling the distribution of the strain and residual stress in the sheet thickness direction, that is, grain-oriented electrical sheet obtained by irradiating a laser beam etc. to introduce lines of strain substantially perpendicular to the rolling direction uniformly in a sheet width direction and cyclically in the rolling direction for magnetic domain control, characterized in that in the two-dimensional distribution of a rolling direction compressive residual stress occurring near one location of the introduction of strain in a cross-section perpendicular to the sheet width direction, the value of the rolling direction compressive residual stress integrated in the region of the cross-section where there is compressive residual stress is within a predetermined range.
    • 5. 发明专利
    • ELECTROMAGNETIC-FIELD ANALYSIS
    • JPH05113458A
    • 1993-05-07
    • JP30235491
    • 1991-10-22
    • NIPPON STEEL CORP
    • UMETSU KENJIUEYAMA KOJIKANEKO HIROOHIRANO YOSHIOIWATA KEIJI
    • G01R29/08G06F17/00G06F19/00G06G7/34G06G7/48
    • PURPOSE:To perform the analysis of an electromagnetic field accurately in a short time without increasing the number of analyzing points by converting the unknown electromagnetic quantity corresponding to the analyzing point into the difference with the unknown electromagnetic quantity of an analyzing point neighboring the above described analyzing point with regard to a unit region, wherein the ratio between the longest side and the shortest side exceeds a specified value. CONSTITUTION:A region to be analyzed is divided into three unit regions 1', 2' and 3' in a rectangular parallelopiped shape with 16 analyzing points i-i+3, j-j+3, k-k+3 and l-l+3 in a grid Pattern. For example, the longest side of the rectangular parallelopiped 2', i.e., the length of the side connecting the analyzing points k+1 and l+1, is divided by the length of the side connecting the analyzing points i+1 and i+2. When the obtained ratio exceeds 50, the unknown electromagnetic quantity Xi+2 corresponding to the analyzing point i+2 is converted into the difference DELTAi+1 between the unknown electromagnetic quantity Xi+1 at the closest point i+1 of the analyzing point i+2 and the unknown electromagnetic quantity Xi+2 at the analyzing point i+2. The difference is used as the unknown number at this analyzing point, and the simultaneous equations of the electromagnetic-field analysis are formed. After the simultaneous equations are solved, the obtained difference DELTAi+1 of the unknown electromagnetic quantity is reversely converted into the value of the original unknown electromagnetic quantity Xi+2.
    • 10. 发明专利
    • ANALYZING METHOD FOR TEMPERATURE DISTRIBUTION OF CONDUCTIVE MATERIAL DUE TO CONDUCTION HEATING
    • JPH0535713A
    • 1993-02-12
    • JP20863091
    • 1991-07-25
    • NIPPON STEEL CORP
    • UMETSU KENJIUEYAMA KOJIKANEKO HIROOHIRANO YOSHIOIWATA KEIJI
    • G01K3/00G06F17/00G06F17/10G06F19/00
    • PURPOSE:To attain the accurate and efficient analysis of the temperature distribution of a conductive material due to inductive heating by considering the temperature change of the electromagnetic physical property value of an analyzing subject. CONSTITUTION:The temperature characteristic curve data on the electromagnetic/thermal physical property value of the steel stock are inputted to a computer together with the initial temperature of the steel stock. Then the time interval of the transient temperature field analysis is inputted together with the start conditions of the metastable electromagnetic field analysis and the end time of the transient temperature field analysis. Then the conductivity and the permeability are obtained from the initial temperature of the steel stock, and the metastable electromagnetic field analysis is carried out. Thus the Joule heat is calculated. Then the heat conductivity is obtained together with the heat capacity per unit accumulation and the heat transmittance. The transient temperature field analysis is repeated based on the obtained heat conductivity/transmittance and the Joule heat while the heat capacity and the heat transmittance are updated. Then the new conductivity and permeability of the steel stock are obtained based on the relevant temperature. Based on these coductivity and permeability, the metastable electromagnetic field analysis is carried out again and the Joule heat is calculated again for repetition of the transient temperature field analysis.