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1. 发明专利

JPH06340949A OPERATING ROLL FOR COLD ROLLING 失效
公开(公告)号：JPH06340949A
公开(公告)日：1994-12-13
申请号：JP13317793
申请日：1993-06-03
申请人： HITACHI LTD
发明人： SHIMIZU MASAMI , SHIMOTAMURA OSAMU
IPC分类号： B21B27/00 , B22D23/10 , C21D9/38 , C22C38/00 , C22C38/24
摘要： PURPOSE:To improve the wear resistance, accident resistance, recessed flaw resistance and chipping resistance of an operating roll by joining the external layer of high speed steel having specified components to an axial material having sufficient toughness by welding. CONSTITUTION:The external layer of high speed steel contg., by weight, 0.5 to 1.5% C, 2.0 to 4.0% Si, =250 deg.C to regulate the hardness of the barrel part into >=96HS.

2. 发明专利

JPH06234003A TANDEM ROLLING MILL 失效
公开(公告)号：JPH06234003A
公开(公告)日：1994-08-23
申请号：JP2235993
申请日：1993-02-10
申请人： HITACHI LTD
发明人： SHIMOTAMURA OSAMU , YOSHIMURA YASUTSUGU , YASUDA KENICHI
IPC分类号： B21B1/24 , B21B13/14 , B21B27/00 , B21B27/03 , B21B27/10 , B21B37/00 , B21B37/28 , B21B37/38 , B21B37/42 , C22C38/00 , C22C38/22 , C22C38/24 , C22C38/30 , C22C38/34
摘要： PURPOSE:To provide a tandem rolling mill high in plate crown control capacity and, complex shape correction capacity, which is free from fears for scratches of a material and a roll, and having a high productivity by a high load. CONSTITUTION:In the preceding stage of a tandem rolling mill, a pair of operation rolls 2 and 3 are allowed to cross in the opposite direction up an down in the horizontal plane by a certain angle to reinforcing rolls 6 and 7 supporting a pair of operation rolls 2 and 3. The first rolling mills 8 to 11 controlling the distribution of a thickness in the width direction, and the-second rolling mills 12 to 14 controlling a plate crown and a shape by using the movements of rolls 4 and 5 in the axial direction and operation roll bending at the same time at the post -stage, are installed at least one set respectively. Highly wear- resistant composite rolls are used to at least operation rolls of these rolling mills.

3. 发明专利

JPH06100953A METHOD FOR PRODUCING COMPLEX STEEL INGOT AND APPARATUS THEREFOR 失效
公开(公告)号：JPH06100953A
公开(公告)日：1994-04-12
申请号：JP24757292
申请日：1992-09-17
申请人： HITACHI LTD
发明人： KONDO YASUO , KODAMA HIDEYO , YASUDA TAKESHI , SHIMOTAMURA OSAMU
IPC分类号： C22B9/18 , C22B9/187 , C22B9/193 , B22D23/07
摘要： PURPOSE:To restrain and uniformize melting depth in the horizontal direction of a steel ingot by shifting the flow passage of DC current during remelting in a complex steel ingot producing method by a DC electroslag remelting. CONSTITUTION:A surface plate 5 is rotated so as not to rotate an electrode 12 for current-collecting fitted to the surface plate, and a consumable electrode 11 is concentrically inserted into the inner part of a cylindrical steel ingot case 10 laid on the surface plate 5 to start the electroslag remelting. The consumable electrode 11 becomes the molten metal and rotating flow in the circular peripheral direction is developed therein by electromagnetic field generated between the consumable electrode 11 and the surface plate 5, and the molten metal bath 17 becomes a solidified metal 18 to fill the cavity in the inner part of the steel ingot 10. At this time, the flow passage of the DC current flowed into the electrode 12 is shifted to the circular peripheral direction of the steel ingot 10. Shifting of this current flow passage is executed while rotating the steel ingot 10 in the reverse direction to the rotating direction of the slag bath 16 and the molten metal bath 17. By this method, heat transmission quantity to the steel ingot 10 is reduced and the melting depth is reduced and the melting in the horizontal direction of the steel ingot is uniformized.

4. 发明专利

JPH0483853A ROLL FOR ROLLING MILL 失效
公开(公告)号：JPH0483853A
公开(公告)日：1992-03-17
申请号：JP19700890
申请日：1990-07-25
申请人： HITACHI LTD
发明人： ERA MASAYUKI , KODAMA HIDEYO , KONDO YASUO , UCHIDA TETSUO , SHIMOTAMURA OSAMU , SHIMIZU MASAMI
IPC分类号： B21B27/00 , C22C38/00 , C22C38/54
摘要： PURPOSE:To obtain a roll for rolling mill having high hardness and combining thermal shock resistance, spalling resistance, and wear resistance by specifying a composition consisting of C, Si, Mn, Ni, Cr, Mo, W, V, Zr, B, Co, and Fe. CONSTITUTION:An ingot of a steel having a composition which consists of, by weight, 0.6-0.9% C, 1-2% Si, 1.2-2.5% Mn, 0.8-2.5% Ni, 5.5-7.5% Cr, 2-5% Mo, 1-5% W, 0.5-4% V, =0.05% B, 0.5-5% Co, and the balance Fe with inevitable impurities and in which Mo/W is regulated to 0.4-5 is subjected to diffusion annealing at 1150-1200 deg.C and then to hot constrained forging at 1050-1175 deg.C. The resulting forged product is subjected to stress relief annealing, to hardening at 975-1200 deg.C, and then to a repetition of high temp. tempering at 470-650 deg.C three or more times. Subsequently, the above product is machined and inspected, by which the roll for rolling mill excellent in various properties can be obtained.

5. 发明专利

JPH0466649A WORKING ROLL HAVING HIGH WEAR RESISTANCE AND HIGH BRIGHTNESS FOR COLD ROLLING 失效
公开(公告)号：JPH0466649A
公开(公告)日：1992-03-03
申请号：JP17523690
申请日：1990-07-04
申请人： HITACHI LTD
发明人： SHIMIZU MASAMI , KATO YASUTOSHI , KIKUHARA TAKASHI , SHIMOTAMURA OSAMU
IPC分类号： B21B27/00 , C22C38/00 , C22C38/30
摘要： PURPOSE:To provide a work roll with both high wear resistance and high brightness by specifying the content of Cr, Mo, W, V and Co in a steel series roll. CONSTITUTION:The working roll for rolling is formed of a high-speed steel having a compsn. constituted of, by weight, 0.5 to 1.5% C, =90HS, and the amt. of eutectic carbides in the structure is suppressed to

6. 发明专利

JPH03122251A COMPOSITE ROLL FOR ROLLING METAL AND ITS PRODUCTION 失效
公开(公告)号：JPH03122251A
公开(公告)日：1991-05-24
申请号：JP16413290
申请日：1990-06-25
申请人： HITACHI LTD
发明人： KIKUHARA TAKASHI , SHIMOTAMURA OSAMU , KONDO YASUO
IPC分类号： B21B27/00 , B32B15/01 , C21D9/38 , C22B9/18 , C22B9/193 , C22C38/00 , C22C38/22 , C22C38/24
摘要： PURPOSE:To allow a composite roll to combine high thermal shock cracking resistance with high wear resistance by constituting the composite roll of a core material made of low alloy steel having a specific hardness lower than that of outer layer material and an outer layer material made of high alloy steel in which hardness, structure, and residual stress are specified, respectively. CONSTITUTION:This composite roll is constituted of a core material made of low alloy steel having a hardness of >=35 Shore hardness and lower than the hardness of outer layer material and an outer layer material made of high alloy steel having a martensitic structure of >=80 Shore hardness and =70kg/mm residual stress at the outermost surface. In order to produce this roll, progressive hardening in which, while applying progressive heating to the outer layer material alone up to a temp. not lower than the austenite transformation point, a liquid refrigerant is sprayed on the heated part is performed. Then, high-temp. tempering treatment in which the amount of retained austenite phase in the outer layer material is regulated to =300 deg.C is made possible even if the surface hardness is regulated to a value equal to that of the conventional roll, resistance to thermal shock can be improved while maintaining wear resistance equal to that of the conventional roll.

7. 发明专利

JPH036859B2 失效
公开(公告)号：JPH036859B2
公开(公告)日：1991-01-31
申请号：JP15307584
申请日：1984-07-25
申请人： HITACHI LTD
发明人： KONDO YASUO , KODAMA HIDEYO , SHIMOTAMURA OSAMU
IPC分类号： B22D7/02 , B22D19/00 , B22D19/08 , B22D23/10 , B22D27/02 , C22B9/18

8. 发明专利

JPH0230310A BUILT-UP ROLL USING SLEEVE AND DEVICE USING ABOVE MENTIONED ROLL 失效
公开(公告)号：JPH0230310A
公开(公告)日：1990-01-31
申请号：JP17902788
申请日：1988-07-20
申请人： HITACHI LTD
发明人： NAKAGAWA MOROO , TAGUCHI MITSUO , YAMAGUCHI TERUO , SHIMOTAMURA OSAMU
IPC分类号： B21B27/03 , C23C2/00
摘要： PURPOSE:To avoid stresses acting on a sleeve in nonuse time and to prolong service life of a rolling roll by setting a gap between a sleeve and an arbor in mounting at room temp. and tightly closing the sleeve to the arbor at using temps. CONSTITUTION:For a rolling mill used at high temps. and the thermal expansion coefficient of an arbor 1 is larger than that of a sleeve 2, a gap 3 is set between the sleeve 2 and arbor 1 in mounting at room temp. and the gap 3 is lost at using temps. to tightly close the sleeve 2 to the arbor 1. In rolling by using the roll, cracks on the sleeve 2 and slips between the arbor 1 are sleeve 2 are not generated, so that service life of the roll is prolonged.

9. 发明专利

JPH01127109A COMPOSITE SLEEVE FOR ROLLING ROLL AND ITS MANUFACTURE 失效
公开(公告)号：JPH01127109A
公开(公告)日：1989-05-19
申请号：JP28656587
申请日：1987-11-13
申请人： HITACHI LTD
发明人： UCHIDA TETSUO , NAKAGAWA MOROO , SHIMOTAMURA OSAMU
IPC分类号： B21K1/02 , B21B27/00 , B21B27/02 , B21B27/03 , B21J1/06
摘要： PURPOSE:To manufacture a composite sleeve for a rolling roll having high joining strength, wear resistance, spalling resistance by performing constrained forging by properly taper heating a thermally sprayed layer after high alloy powders are thermally sprayed onto the peripheral surface of a highly strong and tough cylinder. CONSTITUTION:The peripheral surface of a highly strong and tough cylinder 6 is thermally sprayed with high alloy powders having wear and spalling resistances, higher deformation resistance and elastic modules than those of the cylinder 6 material to form a thermal spray layer 5. An optimal thickness ratio D1/D2 between a thickness D1 of the layer 5 and a thickness D2 of the cylinder 6 is 0.25-1.5. Then the layer 5 and the periphery of the cylinder 6 are heated to a temp. suitable for constrained forging and other parts are subjected to taper heating along a temp. distribution curve 4 and constrained forging is performed. By this, elastic deformation of the cylinder 6 is prevented and only the layer 5 is effectively forged. A sleeve having uniform and fine structures, small residual stresses, high joining strength of a boundary layer, hardly generated cracks or peelings, reutilizable arbor, and spalling and wear resistances is obtained by performing a prescribed machining to the forged stock.

10. 发明专利

JPS645611A COMPOSITE ROLL AND ITS PRODUCTION 失效
公开(公告)号：JPS645611A
公开(公告)日：1989-01-10
申请号：JP15886887
申请日：1987-06-26
申请人： HITACHI LTD
发明人： UCHIDA TETSUO , NAKAGAWA MOROO , SHIMOTAMURA OSAMU , SHIMIZU MASAMI
IPC分类号： B21B27/00 , B21B27/02
摘要： PURPOSE:To improve a shaft strength as well as a wear resistance and spall resistance by increasing the relative volume density ratio of the following thermal spray layer in the composite roll forming a thermal spray layer on the circumference of the shell part of a steel made core stock of high strength and high stiffness. CONSTITUTION:A composite roll blank is formed by providing a thick thermal spray layer 3 with the plasma thermal spray of the powder having a big deformation resistance on the circumference of the shell part 2 of the core stock 1 of the roll for rolling having high strength and high stiffness. This composite roll blank is then subjected to hot treatment by making the thermal spray layer 3 in the range of forging temp. after subjecting to a diffusion heat treatment, if necessary, for reinforcing the joining force of the core stock 1 and thermal spray layer 3 and heating it in the state of the temp. distribution 3 keeping down the temp. at the center of the core stock 1. With this hot treatment,the thermal spray layer 3 is preferentially forged more than the core stock 1 and even after machining the composite roll of good roughness is obtd.

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