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1. 发明专利

JPH05228586A TWIN DRUM TYPE STRIP CONTINUOUS CASTING APPARATUS AND CASTING METHOD THEREOF 失效
公开(公告)号：JPH05228586A
公开(公告)日：1993-09-07
申请号：JP3518092
申请日：1992-02-21
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： ARAI TAKASHI , YOSHIMURA YUJI , YAMAGAMI YASUHIRO , OKA HIDETAKA , WAKIYAMA YOICHI , HATTORI HIDENORI
IPC分类号： B22D11/06 , B22D11/16
摘要： PURPOSE:To smoothen the starting, to prevent breakage of a cast strip at weak point caused by shell washing and to obtain the cast strip having the fixed thickness. CONSTITUTION:At a first step from the starting time until a node of the cast strip passes through the narrowest gap in one pair of the drums, the low pressure oil is supplied to a hydraulic cylinder 9 from a pump 25 through a second hydraulic supplying system 52 having an accumulator 51 and elastically weak rolling reduction force is given to one side of the drum from a bearing 7. At a second step until the shell washing does not develop after the rotation of the drum rises, the elastically further intense rolling reduction force is given by using the accumulator 31, too, followable property of the drum is improved and insufficient cooling is prevented. At a stationary third step, the accumulator 31 is shut off by changing over to first hydraulic supplying system 30 and the rolling reduction control is executed so that one side of the drum becomes parallel to the other drum to make the thickness of the cast strip constant.

2. 发明专利

JPH04187345A METHOD AND INSTRUMENT FOR DETECTING STRIP THICKNESS IN CONTINUOUS CASTING 失效
公开(公告)号：JPH04187345A
公开(公告)日：1992-07-06
申请号：JP31582690
申请日：1990-11-22
申请人： MITSUBISHI HEAVY IND LTD , NIPPON STEEL CORP
发明人： TERADO SADAMU , HATTORI HIDENORI , MORIMOTO YOSHIRO , YAMAGAMI YASUHIRO
IPC分类号： B22D11/06 , B22D11/16 , G01B21/08
摘要： PURPOSE:To detect strip thickness during casting and to enable control by calculating correct values to the strip thickness caused by the deflection of a frame, the thermal deformation of the frame and the thermal deformation of a drum based on a gap between rolling reduction device for one pair of drums. CONSTITUTION:The drum gap S at the time of no rolling reduction at the room temp. is obtd. from rolling reduction positional detector 12. The correction caused by the deformation of frame is indicated with h1=(P-PO/Kn) (wherein, P: rolling reduction pressure acted to the frame and choke, PO: zero adjusting rolling reduction pressure, Kn: rigidity of the frame, etc.). The correction caused by the thermal expansion of frame is indicated with h2=alpha.l(TF- TFO) (wherein, alpha: coefficient of linear expansion of the frame, l: length of the frame, TF: cooling water temp. for frame, TFO: the cooling water temp. for frame at the pressure PO). The correction caused by the thermal expansion of drum is indicated with h3=-betaD(TP-TPO) (wherein, beta: coefficient of linear expansion of the drum, D: diameter of the drum, TD: cooling water temp. for drum, TPO: the cooling water temp. for drum at the pressure PO). Therefore, the strip thickness (h) is calculated with h=S+ h1+ h2+ h3. Since the strip thickness is detected just below the drum in such a manner, there is no delay of the detection and this is the most suitable as feedback signal in the strip thickness control system. Further, even if the drums are opened, the molten metal does not flood over.

3. 发明专利

JPH0788602A METHOD FOR STARTING CASTING IN TWIN ROLL TYPE CONTINUOUS CASTING AND CASTING METHOD AT THE STATIONARY TIME 失效
公开(公告)号：JPH0788602A
公开(公告)日：1995-04-04
申请号：JP25890893
申请日：1993-09-24
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： TAKIHARA KAZUHIKO , YAMAJI CHIHIRO , ARAI TAKASHI , YAMAGAMI YASUHIRO , TERADO SADAMU , HATTORI HIDENORI
IPC分类号： B22D11/08 , B22D11/06
摘要： PURPOSE:To obtain a metallic thin sheet having fine crystal grain and excellent workability and surface characteristics by stably and rapidly solidifying and cooling the thin cast slab just after casting. CONSTITUTION:A pushing roll or a rolling reduction cooling roll 4 is arranged at the lower part of one pair of cooling rolls 1a, 1b in a twin roll type continuous casting apparatus. The contacting condition between the cooling rolls and the thin cast slab 3 is observed by always detecting at least one of the cooling water temp. difference between the inlet and the outlet of the cooling roll 1a at the time of starting the casting and at the stationary condition, the surface temp. of the cooling roll or the casting temp. of the thin cast slab. In the case of providing non-contacting conditions, the peripheral speed of the pushing roll or the rolling reduction roll 4 is quickened. By this method, the cooling efficiency of the thin cast slab is improved and the smooth operation is secured, and the yield of the cast slab is improved and the workability is improved by making the crystal grain finely and the cast slab having excellent surface characteristic is obtd.

4. 发明专利

JPH0760421A METHOD FOR MEASURING LEVEL IN CONTINUOUS CASTING MACHINE 失效
公开(公告)号：JPH0760421A
公开(公告)日：1995-03-07
申请号：JP21614293
申请日：1993-08-31
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： YAMAGAMI YASUHIRO , MORIMOTO YOSHIRO , YAMADA MAMORU , HATTORI HIDENORI , TERADO SADAMU
IPC分类号： B22D11/16
摘要： PURPOSE:To accurately measure molten metal surface level in a mold in a continuous casting machine for low m.p. metal. CONSTITUTION:Light is projected to molten metal pool part in the mold in the continuous casting machine and color differences among the molten metal, the molds 1a, 1b in contact with the molten metal, a pouring nozzle 6 or the other dipping materials 10a, 10b are optically measured to accurately measure the surface level of the molten metal 4. Particularly, this method can be applied to the molten metal which does not emit spontaneous light, or the molten metal which has less light energy by using the dipping materials 10a, 10b heated to the temp. equal to or more than the solidified temp. of the molten metal 4.

5. 发明专利

JPH05237603A 失效
公开(公告)号：JPH05237603A
公开(公告)日：1993-09-17
申请号：JP4460192
申请日：1992-03-02
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： ARAI TAKASHI , YOSHIMURA YUJI , WAKIYAMA YOICHI , HATTORI HIDENORI
IPC分类号： B22D11/06
摘要： PURPOSE:To improve durability of a side weir by solving problems of deterioration of sealability and break of a cast slab due to peeling and biting in of a metal adhered to a side weir of a twin roll type continuous casting apparatus. CONSTITUTION:A pair of the side weirs 16, 17 to seal the molten metal pool 11, which slide-contacts with an end of a pair of the rolls 2, 3, and the vibrator 25 actuated by a command of the control device 24 are arranged, at the same time of a start of casting, the side weirs are vibrated (or as ciliated) on the slide contacting surface with the end of the drums 2, 3. When a variation of the gap between the rolls 2, 3 occurring in a short time after casting start is gradually converged not to cause a variation in the width beyond the prescribed value within the prescribed time, a vibration of the side weir is stopped by the control device 24 to hold down a wear of the side weir to a minimum and to prevent harmful effect due to wear.

6. 发明专利

JPS6434553A METHOD FOR CONTROLLING MOLTEN STEEL LEVEL IN CONTINUOUS CASTING MACHINE 失效
公开(公告)号：JPS6434553A
公开(公告)日：1989-02-06
申请号：JP19046187
申请日：1987-07-31
申请人： MITSUBISHI HEAVY IND LTD , NIPPON STEEL CORP
发明人： TERADO SADAMU , KAWANAMI KATSUSUKE , HATTORI HIDENORI , ITO HIROO , TANAKA KEIHACHIRO
IPC分类号： B22D11/16 , B22D11/06 , B22D11/18
摘要： PURPOSE:To improve the productivity and the quality and to obtain reduction of man-hour by perfectly automatizing molten steel level control at initial period after starting casting to optimize reaching time into the aimed molten steel level and over-shoot. CONSTITUTION:The molten steel flow rate Q1 is adjusted by driving a stopper 9 upward/downward through a stopper driving device 10, and the molten steel 6 in a tundish 5 is supplied into tulip zone 8 through a nozzle 7. Casting condition and molten steel level detecting signal theta are inputted and the level control device 12 outputting stopper opening command Z and drum speed command V is constituted by an opening pattern arithmetic part 20, level aimed value arithmetic part 21, controller 22, control starting timing generating part 25 and switch 24. At the time of starting the casting, the stopper opening Z is pattern-controlled and when the molten steel level theta comes to near the aimed value theta*, the pattern control is exchanged into feed-back control by a level detecting value theta. By this method, start-up of the molten steel level is quickened and the over-shoot is prevented.

7. 发明专利

JPH07328750A DEVICE FOR CONTROLLING FORCE PRESSING SHORT-SIDE BLOCK IN BELT TYPE CONTINUOUS CASTER 失效
公开(公告)号：JPH07328750A
公开(公告)日：1995-12-19
申请号：JP12357194
申请日：1994-06-06
申请人： MITSUBISHI HEAVY IND LTD , NIPPON STEEL CORP
发明人： YONEDA JUNKICHI , HATTORI HIDENORI , OKADA RIKIMI , KANAI NORIYUKI , KATAHIRA KEIICHI
IPC分类号： B22D11/16 , B22D11/06
摘要： PURPOSE:To control the force pressing the mold part of a short-side block definitely. CONSTITUTION:The reaction force P of the force pressing the short-side block 31 is detected by a load cell 1 through a driving shaft 44, spherical surface bearing 4, bracket 3 and detecting rod 5. The detected reaction force P is fed back to a pressing force adjusting means and compared with the preset pressing force. Then, when the detected reaction force is larger or smaller than the preset pressing force, the driving torque of driving means for the short-side block is adjusted by the pressing force adjusting means, and the force pressing the short-side block is controlled definitely to prevent the wear of the short-side block and the chain part and the occurrence of the step difference between the mold part and the short-side block.

8. 发明专利

JPH06277807A TWIN ROLL CONTINUOUS CASTING METHOD AND ITS APPARATUS 失效
公开(公告)号：JPH06277807A
公开(公告)日：1994-10-04
申请号：JP32765391
申请日：1991-12-11
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： ARAI TAKASHI , OKA HIDETAKA , WAKIYAMA YOICHI , HATTORI HIDENORI
IPC分类号： B22D11/06
摘要： PURPOSE:To provide a twin roll continuous casting method and its apparatus, in which bias wear of a side weir is effectively prevented, in the pressing method of the side weir to the end surfaces of cooling rolls in the twin roll continuous casting. CONSTITUTION:In the twin roll continuous casting method synchro-nously displacing three pressing force loading on members 4a-4c for loading the pressing force on the total three positions of one position at the lower part and two positions at the upper part in the back surface of the side weir 3 at the fixed velocity in the pushing direction, in the range of satisfying the relational inequality 0.8A

9. 发明专利

JPH06114504A TWIN ROLL STRIP CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPH06114504A
公开(公告)日：1994-04-26
申请号：JP27198092
申请日：1992-10-09
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： ARAI TAKASHI , YOSHIMURA YUJI , YAMAGAMI YASUHIRO , HATTORI HIDENORI , TERADO SADAMU
IPC分类号： B22D11/06 , B22D11/08
摘要： PURPOSE:To prevent such a trouble that it becomes impossible to start rolls caused by a lump developed at the tip part (the bottom part) of a cast strip at the time of starting up a continuous casting apparatus and the development of damage to the end part of the rolls caused by biting of the solidified metal at the initial stage of casting. CONSTITUTION:In the twin roll type strip continuous casting apparatus 1, an acceleration of the rolls at the interval from starting up the drums 2, 3 to coming into a range of 60-375mm the casting distance is set to 8-24m/min/sec. Thereafter, the casting is executed at a stationary roll velocity with lower acceleration than the roll acceleration.

10. 发明专利

JPH05305399A 失效
公开(公告)号：JPH05305399A
公开(公告)日：1993-11-19
申请号：JP11370592
申请日：1992-05-06
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： ARAI TAKASHI , YOSHIMURA YUJI , YAMAGAMI YASUHIRO , OKA HIDETAKA , HATTORI HIDENORI , TERADO SADAMU
IPC分类号： B22D11/06 , B22D11/16
摘要： PURPOSE:To prevent a generation of cast strip breakage due to hot band and a thickness variation of cast strip by detecting a reaction force applied on roll support part and inputting a line contact pressure per roll width to a rolling force control apparatus through a limiter to control under a specified upper limit. CONSTITUTION:When the strip 13 is continuously cast by the twin roll strip continuous casting apparatus which is cooled inside and provided with a pair of rolls 2, 3 rotary driven opposite each other at the same speed, the reaction force applied on the bearings 6, 7 to support the rolls 2, 3 is detected. The specified value P of reaction force, which divides a sum of the detected reaction forces by the roll diameter, is set to 1-25kg/mm and also the specified upper limit P+P for the specified value P is set, among detected values P, the detected value P of reaction force exceeding the upper prescribed value P+P is inputted to the control apparatus 16 through the limiter circuit of proportional control system 17 as set the specified upper limit P+P. Thus, it slows the actuation of rolling force control and decreases a depth of constricted part in the variation characteristic of roll gap.

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