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公开(公告)号：JPS63273519A
公开(公告)日：1988-11-10
申请号：JP10430287
申请日：1987-04-30
Applicant: HITACHI LTD
Inventor： KUROKAWA TAKEO , NAKASAKI TAKAMITSU , WATANABE SHINOBU , SUZUKI KAZUYUKI
IPC: B21D5/01
Abstract: PURPOSE:To bend a plate material by one stage and to reduce the man-hour for the work by changing a bending span due to the movement of a bolster prepared in an equipment and a pressurizing position of an upper die in bending a plate material in a semi-ring shape. CONSTITUTION:A material 1 is positioned at a prescribed site on the bolster 2. Then, the bolster 2 is moved by the drive of a hydraulic cylinder, etc., simultaneously with bending work to reduce a bending span. At this time, pressure is applied from a press 7 through an upper die 3 and bending work is carried out gradually. In addition, in time of the final bending, that bending span is enlarged to be worked by application of the final pressure of the upper die 3 in a prescribed semi-ring shape. Furthermore, if the bolster 2 is moved up or down this structure can correspond even to H-dimension determined by various bending shapes.
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公开(公告)号：JP2001121217A
公开(公告)日：2001-05-08
申请号：JP29918199
申请日：1999-10-21
Applicant: HITACHI LTD
Inventor： IWAKURA AKITA , SATO TOSHIMI , KUROKAWA TAKEO
Abstract: PROBLEM TO BE SOLVED: To provide a flexible core rod capable of keeping a predetermined shape during the pressing and being easily pulled out after the pressing when a hollow member of a three-dimensional curved surface is pressed from a plate. SOLUTION: The flexible core rod 1 is obtained by alternately arranging split metallic rods 2a and split elastic bodies 2b such as rubber, and connecting them to each other by using a wire 3a or the like so as not to be separate from each other.
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公开(公告)号：JPS58168802A
公开(公告)日：1983-10-05
申请号：JP4891482
申请日：1982-03-29
Applicant: HITACHI LTD
Inventor： KUROKAWA TAKEO
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公开(公告)号：JPS63130235A
公开(公告)日：1988-06-02
申请号：JP27659386
申请日：1986-11-21
Applicant: HITACHI LTD
Inventor： KUROKAWA TAKEO , NAKASAKI TAKAMITSU , MIDORIKAWA MASAKAZU
Abstract: PURPOSE:To reduce bending force, and also, to improve a yield by providing a clevis corresponding to the bending inside diameter and the plate width, on the side face which becomes the inside diameter side of bending of a band plate which is rolled and comes out, thereafter, executing the bending. CONSTITUTION:A stock 1 rolled by the upper and the lower rolling rollers 2, 4 is fed out forward. Immediately after this rolling, bending moment is added by a bending control means 3 which can move to the right and left from the side direction. By providing a clevis part 5 for reducing a deformed volume quantity N, the bending moment quantity can be reduced. According to this method, the yield of a product can be improved.
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公开(公告)号：JPS6199526A
公开(公告)日：1986-05-17
申请号：JP21840884
申请日：1984-10-19
Applicant: Hitachi Ltd
Inventor： KUROKAWA TAKEO
Abstract: PURPOSE:To bend easily a stock into an optional radius regardless of its shape, by providing different peripheral speeds to respective side edges of a stock at the 2nd stage in rolling a stock having a rectangular cross section into a straight stock having a trapezoidal cross section, and rolling it into a stock having an uniform thickness at the 2nd stage. CONSTITUTION:A stock 1 is mounted on a guide table 7 and is positioned in its width direction by a pressing means 12. Next, a gap between upper and lower rolls 3, 4 different in taper from each other is made different in the axial direction, and is set to the prescribed value at the 1st stage. A taper stock having a trapezoidal cross section is obtained by passing the stock 1 between these rolls 3, 4. Further at that time, the stock 1 is rolled into the straight stock by restraining its bending by means of side guides 22 placed at the outlet side. At the 2nd stage, said stock is passed between the rolls 3, 4 after adjusting the gap between the rolls 3, 4 so that the gap is uniform in the axial direction and the thickness of stock is also uniform. Then, the taper stock is rolled into a flat stock of uniform thickness, and the peripheral speeds different at respective side edges are provided to the stock by the rotation of roll 4, and a flat product of prescribed radius dimension is obtained.
Abstract translation: 目的：通过在第二阶段向库存的相应侧边缘提供不同的圆周速度，将坯料轻松地弯曲成可选的半径，将具有矩形横截面的坯料滚动成具有梯形横截面的直线坯料 ，并在第二阶段将其轧制成具有均匀厚度的坯料。 构成：坯料1安装在导向台7上，并通过按压装置12在其宽度方向上定位。接下来，使彼此不同的上下辊3,4之间的间隙在轴向方向上不同 ，在第一阶段设定为规定值。 通过使原料1在这些辊3,4之间通过，获得具有梯形横截面的锥形坯料。此时，通过借助于放置在出口处的侧向引导件22来限制其弯曲，将坯料1卷成直线坯料 侧。 在第二阶段，在调节辊3,4之间的间隙之后，所述坯料在辊3,4之间通过，使得间隙在轴向方向上是均匀的，并且坯料的厚度也是均匀的。 然后，将锥形坯料轧制成均匀厚度的扁平坯料，并且通过辊4的旋转将不同侧边缘的圆周速度提供给坯料，并获得规定半径尺寸的扁平产品。
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Patent Agency Ranking
公开(公告)号：JP2000326030A
公开(公告)日：2000-11-28
申请号：JP14277899
申请日：1999-05-24
Applicant: HITACHI LTD
Inventor： IWAKURA AKITA , SATO TOSHIMI , KUROKAWA TAKEO , MATSUURA TAKESHI
Abstract: PROBLEM TO BE SOLVED: To provide a molded part for which the cost of a die is reduced, working flaws are less, and quality is excellent by roughly working a stock plate placed on an elastic body stored in a main retainer using a rigid die, precisely working it to form a plastically formed stock, and joining it through welding to manufacture a hollow member. SOLUTION: A stock of a tubular material 1 is placed on an elastic body 2, such as a urethane rubber stored in a main retainer 3, and a core die 4 and a pressing jig to press the core die 4 are installed thereon. The core die 4 is loaded by the pressing jig, the stock of the tubular material 1 is pressed into the elastic body 2, such as urethane rubber so as not to interfere with the pressing jig and wound around the core die 4 to form a semi-product. A sub retainer 6, in which an elastic body 7 such as urethane rubber is stored, is arranged on both sides of an intermediate stock as an upper die. The intermediate stock and the core die 4 are held by the sub retainers 6, and the pressing jig is removed. The sub retainer 6 is loaded to work the intermediate stock and obtain a plastically formed product.
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公开(公告)号：JPH0970688A
公开(公告)日：1997-03-18
申请号：JP22988195
申请日：1995-09-07
Applicant: HITACHI LTD
Inventor： TANIDA SHOZO , FUNAMOTO TAKAO , MATSUMOTO TOSHIMI , WACHI HIROSHI , NAKASAKI TAKAMITSU , KOBAYASHI KAZU , KUROKAWA TAKEO , YOKOBA NORIO , IIZUKA NOBUYUKI , KUMADA KAZUHIKO
Abstract: PROBLEM TO BE SOLVED: To obtain a Co base coated arc welding electrode which is suitable for a Co base super-alloy, especially for repair welding of flaws generating in the time of precise forging of a nozzle of a gas turbine or cracks generating during operating, and which has the excellent thermal fatigue property of the welding metal. SOLUTION: The component of a core wire is, by weight %, 0.03 to 0.15 C, 0.05 to 1.00 Si, 0.05 to 1.5 Mn,
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公开(公告)号：JPH0919714A
公开(公告)日：1997-01-21
申请号：JP16851195
申请日：1995-07-04
Applicant: HITACHI LTD
Inventor： YOSHITOMI YUJI , HANEDA MITSUAKI , TANAKA SHINJI , ARAYA TAKESHI , KUROKAWA TAKEO , YOKOBA NORIO , SATO TOSHIMI , OCHIAI YOSHINORI
Abstract: PROBLEM TO BE SOLVED: To remarkably improve the reliability of a gas turbine by forming a bent tube having a special shape with high accuracy and at a low cost and using the bent tube having the special shape for the flow passage of the gas turbine. SOLUTION: This device is the device for forming into the bent tube 15 having the special shaped cross section by executing bending forming of a base stock having a circular cross section with internal pressure loaded on the base stock and the internal pressure is sealed by pressing apacking 9 on the outer surface of which a slope is provided against the circular tube 1 of the base stock. The packing is made of a hard packing 9b for flaring the circular tube 1 of the base stock and a soft packing 9a for sealing the internal pressure and two these processes are successively executed with the same device.
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公开(公告)号：JPS62192215A
公开(公告)日：1987-08-22
申请号：JP3336886
申请日：1986-02-18
Applicant: HITACHI LTD
Inventor： MIDORIKAWA MASAKAZU , KITA HISANAO , NAKASAKI TAKAMITSU , KUROKAWA TAKEO , WATANABE SHINOBU
IPC: B21D11/08
Abstract: PURPOSE:To perform the bending of a blank in the prescribed curvature size from the beginning with a small-sized and strong device by performing the guide and bending of the blank to be rolled by the upper and lower rolls with one side step by the inlet side guide directly provided on a bearing part and the outlet side approaching side roll. CONSTITUTION:A work blank 1 is rolled by the upper and lower rolls 2A, 3A having a stepped bank A at one side. The blank 1 is guided and pressed by the inlet side guide 11 directly provided on the housing 8 at the opposite side of the stepped bank A of the housings 7, 8 of roll bearings 5, 6 and by the side roll 4' provided by approaching to the outlet side. The blank 1 is subjected to bending by the approaching side roll4' from the beginning with preventing the side slippage of the blank 1 by the stepped part A by rolling the blank 1 by guiding it optimally. The bending of the succeeding side roll 4 is therefore made stable and correct and the blank 1 is worked in the prescribed size and curvature with a compact and strong device.
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公开(公告)号：JPH11336504A
公开(公告)日：1999-12-07
申请号：JP14698798
申请日：1998-05-28
Applicant: HITACHI LTD
Inventor： MATSUURA TAKESHI , IIZUKA NOBUYUKI , KUROKAWA TAKEO , SEKIDA TOMIO , KUMADA FUMIKATSU , MATSUDA MASAKI
Abstract: PROBLEM TO BE SOLVED: To provide a hollow AVN nozzle blade easily manufacturable at a low cost and establish an associate manufacturing method, whereby an annealing process as post-process and a correction by a skilled workman can be omitted even if the hollow AVN blade is of metal sheet welded structure. SOLUTION: One metal sheet 10 is subjected to a plastic processing into a hollow blade form, and the starting and ending parts of the metal sheet are overlapped at the tail part of the blade and coupled together so that a hollow nozzle blade is formed, wherein a plurality of welding passes 3c stretching in the longitudinal direction of the blade and formed at a specified spacing are applied to the overlapped tail part of the blade.
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