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    • 3. 发明专利
    • Method for reducing residual stress by using induction heating method
    • 使用感应加热方法减少残余应力的方法
    • JP2007039705A
    • 2007-02-15
    • JP2005219866
    • 2005-07-29
    • Hitachi Ltd株式会社日立製作所
    • TAKAHASHI SHIROMASUDA MINORUHAYASHI SHOJIYOSHIE YUTAKA
    • C21D9/08C21D1/30C21D1/42G21D1/00
    • Y02E30/40Y02P10/212Y02P10/253
    • PROBLEM TO BE SOLVED: To provide a method for sufficiently reducing a residual stress of such a portion as a decontamination port of a pipe in a recirculation system, at which a non-condensable gas stays. SOLUTION: This method for reducing the residual stress comprises the steps of: substituting vapor for the non-condensable gas which stays at the part to be executed to discharge the non-condensable gas from the inside of the part; further substituting water for the vapor which has substituted for the gas in the part; and then heating an outer surface of the part in a state of having filled the part with the water to generate temperature difference in a thickness direction of the part. The method can remove the non-condensable gas, and accordingly can sufficiently reduce the residual stress in the part at which the non-condensable gas stays. COPYRIGHT: (C)2007,JPO&INPIT
    • 要解决的问题:提供一种用于充分降低在不可冷凝气体停留的再循环系统中的管道的去污口的部分的残余应力的方法。 解决方案:用于减少残余应力的方法包括以下步骤:将蒸气替换为待执行部分的不可冷凝气体,以从部件内部排放不可冷凝气体; 进一步取代水代替部分气体的蒸气; 然后在用水填充该部分的状态下加热部件的外表面,以在部件的厚度方向上产生温度差。 该方法可以除去不可冷凝气体,从而可以充分降低不可冷凝气体停留的部分中的残余应力。 版权所有(C)2007,JPO&INPIT
    • 5. 发明专利
    • MANUFACTURE OF SODIUM-SULFUR BATTERY
    • JP2001085052A
    • 2001-03-30
    • JP26159799
    • 1999-09-16
    • HITACHI LTD
    • SATO YOSHIMIUSAMI SABUROMASUDA MINORU
    • H01M10/39
    • PROBLEM TO BE SOLVED: To lessen thermal stresses by making smooth the temperature gradient on an insulating ring at the time friction pressure contacting the ring with the vessel flanges. SOLUTION: With glass soldering, an insulating ring 28 is attached to the open end of a solid electrolyte tube 14 constituting a bulkhead between a positive electrode vessel 10 to accommodate sulfur 26 and a negative electrode vessel 28 to accommodate sodium 24, and a stepped or tapered portion is formed at the forefront of a negative electrode vessel flange 30 and a positive electrode vessel flange 32 both formed in a ring shape to serve for friction pressure contacting these flanges 30 and 32 to the oversurface of the ring 28, and the ring 28 is put in standstill in the condition that its surface is contacted by the stepped or tapered portion, and the flanges 30 and 32 are rotated so that friction is generated in between, and with the frictional heat generated, the flanges 30 and 32 and the ring 28 are melted, and then the flanges 30 and 32 are pressed to the ring 28 so that pressure contacting is accomplished.
    • 8. 发明专利
    • JOINT MADE OF SHAPE MEMORY ALLOY
    • JPH09281278A
    • 1997-10-31
    • JP9504996
    • 1996-04-17
    • HITACHI LTD
    • AMANO KAZUOFUJIMORI HARUOENOMOTO KUNIOSHIGENAKA NAOTOMOCHIZUKI MASATOOTAKA MASAHIROHIRANO KATSUHIKOMASUDA MINORU
    • G21C19/20B21D39/04C22C19/03
    • PROBLEM TO BE SOLVED: To facilitate and rationalize piping replacement work by providing the outside surface of a cylindrical liner with grooves having parts penetrating this cylindrical liner and forming shape memory allay rings and the cylindrical liner to a fit structure. SOLUTION: The shape memory allay rings 1 are manufactured by using shape memory alloys. These allays are made to memorize a shape in such a manner that the diameter thereof is reduced by heating the allays to their austenitic transformation temp. or above. The cylindrical liner 2 to be inserted into the inner side of the shape memory allay rings 1 is provided with two rows of annular projecting parts 3a, 3b in its circumferential direction and the outside surface is provided with the grooves 5 having the parts penetrating the inside of the liner. When the shape memory alloy rings 1 restore the shape to the reduced diameter by inducing the austenitic transformation, the cylindrical liner 2 is deformed and the annular projecting parts 3a, 3b formed on its inside surface bite into a piping, thereby clamping the piping. In such a case, the rigidity of the cylindrical liner 2 is enhanced if the width of the grooves 5 on the outside surface of the cylindrical liner 2 is made small and the number of the grooves is reduced.