WO2019188002A1 - 鋼板の端曲げ方法および装置並びに鋼管の製造方法および設備 - Google Patents
鋼板の端曲げ方法および装置並びに鋼管の製造方法および設備 Download PDFInfo
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- WO2019188002A1 WO2019188002A1 PCT/JP2019/008298 JP2019008298W WO2019188002A1 WO 2019188002 A1 WO2019188002 A1 WO 2019188002A1 JP 2019008298 W JP2019008298 W JP 2019008298W WO 2019188002 A1 WO2019188002 A1 WO 2019188002A1
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- Prior art keywords
- bending
- steel sheet
- steel plate
- steel
- width direction
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
- B21D5/015—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments for making tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0815—Making tubes with welded or soldered seams without continuous longitudinal movement of the sheet during the bending operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0826—Preparing the edges of the metal sheet with the aim of having some effect on the weld
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
- B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
- B21D43/08—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by rollers
- B21D43/09—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by rollers by one or more pairs of rollers for feeding sheet or strip material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- B21D5/0209—Tools therefor
Definitions
- the present invention relates to an end bending method and apparatus for bending a steel sheet in the width direction end portion in a plurality of times in the longitudinal direction of the steel sheet. Further, the present invention is a method of manufacturing a steel pipe by forming a steel plate subjected to end bending into a cylindrical shape, butting the end portions in the width direction, and joining the end portions in the width direction of the abutted steel plates by welding. And related to equipment.
- Patent Documents 1 to 3 disclose methods for obtaining a good shape at the butt portion.
- the feed length b is prescribed
- the length Lc of the bending region is defined according to the thickness and strength of the steel plate.
- the radius R1 of the upper die, the horizontal distance u from the center of curvature of the upper die to the end of the steel plate, and the pressing force w are defined according to the thickness and strength of the steel plate.
- Patent Document 4 proposes a method for manufacturing a steel pipe with little variation in the shape of the butt portion based on the strength information of the steel sheet.
- Patent Document 5 proposes a method of continuously performing end bending.
- JP-A-8-294727 Japanese Patent Laid-Open No. 10-2111520 JP 2008-119710 A JP 2009-6358 A Japanese Unexamined Patent Publication No. 7-32049 JP 2007-245218 A
- Patent Documents 1 to 4 are all for the purpose of optimizing the shape of a cross section of a steel sheet, and the fluctuation of the end bending angle between adjacent parts of the steel sheet at the boundary of the feed. has not been studied. Moreover, in the method of patent document 5, it is not certain that it will become a shape similar to a longitudinal direction center part in the front-end
- An object of the present invention is to eliminate the above-mentioned problems of the prior art and to reduce the fluctuation of the end bending angle between the adjacent portions of the steel plate at the boundary of the feed.
- the inventors investigated the variation of the end bend angle between the adjacent portions of the steel plate at the boundary of the feed and elucidated the cause, leading to the present invention.
- the first aspect includes a pair of molds arranged corresponding to the widthwise ends of the steel sheet, an actuator for clamping the pair of molds with a predetermined pressing force, and the steel sheet along its longitudinal direction. And a bending mechanism for conveying the steel sheet in the width direction by the pair of molds while intermittently conveying the steel sheet by the conveying mechanism. Is a method of bending the steel sheet that is bent over the entire length in the width direction end of the steel sheet, and of the pair of molds, the width direction end of the steel sheet to be bent is formed.
- the flat part and the escape part are Using a pair of molds are connected with a tangent passing an end bending method of a steel sheet which is characterized in that the bending in the width direction end portion of the steel sheet.
- the center of the flat portion in the transport direction is downstream in the transport direction with respect to the center of the pressing force generated by the actuator in the transport direction. It is an end bending method of a steel plate characterized by bending at the end in the width direction of the steel plate in a state shifted to the side.
- the third aspect is the first pass of bending forming the steel sheet in the width direction end, and the front end of the steel sheet in the transport direction is aligned with the front end of the flat part.
- This is a method of bending the end of a steel sheet, characterized in that the position is set to a predetermined position.
- the tail end of the steel sheet in the transport direction is the flat part. It is the end bending method of the steel plate characterized by setting it as the position match
- a pair of molds arranged corresponding to the widthwise end of the steel sheet, an actuator for clamping the pair of molds with a predetermined pressing force, and a direction along the longitudinal direction of the steel sheet
- a steel plate end bending apparatus that transports the steel sheet as a transport direction, and a plurality of bends of the width direction end of the steel sheet by the pair of molds while intermittently transporting the steel sheet by the transport mechanism.
- the end of the steel sheet is bent over the entire length in the width direction end of the steel sheet, and the steel sheet bent at both ends in the width direction is formed into a cylindrical shape.
- a method of manufacturing a steel pipe comprising: a cylindrical forming step for abutting the direction end portions; and a joining step for welding the width direction end portions of the abutted steel plates.
- the end bending method of the steel sheet of any of the aspects up to 4 A method for producing a steel pipe, characterized in that there.
- a pair of molds arranged corresponding to the widthwise ends of the steel sheet, an actuator for clamping the pair of molds with a predetermined pressing force, and the steel sheet along the longitudinal direction thereof.
- a conveying mechanism that conveys the direction as the conveying direction, and by bending the steel sheet intermittently by the pair of molds, the steel plate is bent a plurality of times in the width direction by the pair of molds.
- An end bending apparatus for a steel plate that performs bending over the entire length in the width direction end of the pair of dies, on the surface that is the outside of the bending at the width direction end of the steel plate to be bent.
- the mold on the contact side has a flat part that comes into contact with the surface that is the outside of the bending, and a relief part that consists of a curved surface provided adjacent to at least the downstream side in the transport direction of the flat part,
- the flat portion and the relief portion are connected with a common tangent line. It is an end bending apparatus of a steel sheet, characterized in that there.
- the pressing force generated by the actuator is such that the center of the flat portion in the transport direction is the mold on the side in contact with the outer surface of the bending of the pair of molds.
- the steel sheet end bending apparatus is characterized by being shifted downstream in the transport direction with respect to the center in the transport direction.
- the pair of molds arranged corresponding to the widthwise ends of the steel sheet, the actuator for clamping the pair of molds with a predetermined pressing force, and the steel sheet along the longitudinal direction thereof.
- a conveying mechanism that conveys the direction as the conveying direction, and by intermittently conveying the steel sheet by the conveying mechanism, by bending the steel sheet in the width direction end by the pair of molds a plurality of times,
- a steel plate end bending apparatus that performs bending over the entire length in the width direction end of the steel plate, and a steel plate that is bent at both width direction ends are formed into a cylindrical shape, and the width direction ends of the steel plates are joined together.
- a steel pipe manufacturing facility comprising: a cylindrical forming device for abutting; and a joining device for welding end portions in the width direction of the abutted steel plates, wherein the end bending device for the steel plate is the sixth or seventh aspect.
- a steel pipe comprising an end bending apparatus for steel sheets It is a manufacturing facility.
- one mold contacting the outer surface of the bending at the end in the width direction of the steel sheet to be bent is in contact with the outer surface of the bending of the steel sheet.
- a flat portion and a relief portion formed of a curved surface provided adjacent to at least the downstream side of the conveyance direction of the flat portion, and the flat portion and the relief portion are connected with a common tangent line.
- FIG. 1 It is sectional drawing in the conveyance direction which shows the press mechanism in the conventional end bending apparatus of a steel plate, (a) has shown the state before end bending, (b) has shown the state at the time of end bending. It is a graph which shows the change of the steel plate shape by end bending.
- (A) shows the relationship between the center of the pressing force, the center of the flat portion, and the center of the bending deformation force when the first end bending process is performed using the conventional steel sheet end bending apparatus shown in FIG.
- FIG. (B) is a diagram schematically showing a state in which the lower mold is inclined due to the relationship between the center of the pressing force, the center of the flat portion, and the center of the bending deformation force.
- FIG. (A) shows the relationship between the center of the press force, the center of the flat portion, and the center of the bending deformation force when the second end bending process is performed using the conventional steel sheet end bending apparatus shown in FIG.
- (B) is a diagram schematically showing a state in which the lower mold is inclined due to the relationship between the center of the pressing force, the center of the flat portion, and the center of the bending deformation force. It is sectional drawing along the conveyance direction which shows the lower metal mold
- FIG. (A) is the center of a press force, the center of a flat part, and the deformation
- front or front means “downstream side” or “direction from the upstream side to the downstream side” as viewed in the conveying direction of the steel sheet in the end bending apparatus described later, and “rear” or “ “Backward” is the opposite direction.
- FIG. 1 shows an outline of a steel pipe manufacturing method and equipment according to an embodiment of the present invention for manufacturing a steel pipe from a steel sheet cut to a predetermined size.
- the steel plate S cut to a predetermined size is subjected to groove processing on its side surface by the edge mirror 10 or the edge planar.
- the tab plate St is welded to the front end portion (longitudinal front end portion) Sa and the tail end portion (longitudinal rear end portion) Sb of the steel plate S.
- the tab plate St may not be provided. is there.
- end bending is performed by the end bending apparatus (C press) 20 according to one embodiment of the present invention (end bending process), and a cylindrical shape is formed by the cylindrical forming apparatus 30 (cylindrical forming process).
- the cylindrical forming apparatus 30 is not limited to the one formed by the U press 30A for first forming the steel sheet S subjected to end bending forming into a U shape, and then the O press 30B for forming an O shape (cylindrical shape). It is also possible to use a bending press 30C that is provided with a feeding mechanism that feeds S in the width direction and that gradually forms a final cylindrical shape by performing three-point bending while sequentially feeding the steel plates S in the width direction.
- FIG. 2 shows an example of the steel sheet S before end bending.
- the width of the steel sheet S ranges widely, for example, from 1200 mm to 5100 mm, depending on the outer diameter of the product steel pipe. Further, the length of the steel plate is often about 12 m, which is the standard length of a line pipe.
- a tab plate St is welded to each end in the width direction of the longitudinal end portion Sa and the tail end portion Sb of the steel sheet S to be the steel pipe body, but there may be no tab plate St.
- FIG. 3 shows a schematic configuration of the end bending apparatus 20 for a steel plate.
- the steel plate end bending apparatus 20 has a transport mechanism 21 that transports the steel sheet S along the longitudinal direction thereof as the transport direction 1, and the downstream side 3 in the transport direction as the front, and the left width direction end Sc with a predetermined curvature.
- an interval adjusting mechanism (not shown) for adjusting the interval.
- the transport mechanism 21 includes a plurality of transport rolls 21a disposed before and after the press mechanisms 22A and 22B.
- Each transport roll 21a is configured such that its roll axis is oriented in a direction orthogonal to the transport direction of the steel sheet S and is rotated at a speed synchronized with each other by a motor and a transmission mechanism (not shown).
- FIG. 4 shows a cross section in the width direction of the press mechanism 22A that bends and deforms the left width direction end portion Sc of the steel sheet S in the direction from the upstream side 2 to the downstream side 3 in the conveying direction 1 of the steel sheet S.
- the pressing mechanism 22A and the pressing mechanism 22B are symmetrical and have the same configuration, and thus the detailed illustration of the pressing mechanism 22B is omitted.
- the press mechanisms 22A and 22B push up the upper mold 23 and the lower mold 24 as a pair of molds opposed to each other in the vertical direction and the lower mold 24 together with the tool holder 25, and clamp the mold with a predetermined pressing force.
- a hydraulic cylinder 26 as an actuator and a clamp mechanism 27 that releasably holds the steel sheet S inside the upper die 23 and the lower die 24 in the width direction are provided.
- the length in the longitudinal direction of the steel plate S of the lower die 24 and the upper die 23 is shorter than the length of the steel plate S, and the steel plate S is shifted in the longitudinal direction by the transport mechanism 21 (intermittently feeding).
- the bending is performed a plurality of times, and end bending is applied to the width direction ends Sc and Sd of the steel sheet S over the entire length.
- FIG. 5 is a cross-section in the width direction at the same position as in FIG. 4, but shows a state where the lower mold 24 is pushed up by the hydraulic cylinder 26 and clamped.
- the hydraulic cylinder 26 is advanced from the state before the end bending shown by the broken line, the lower mold 24 is pushed up to the position of the solid line, and the width direction ends Sc and Sd of the steel sheet S are arc-shaped of the upper mold 23. It is bent into a shape along the molding surface.
- the width at which end bending is performed varies depending on the width of the steel sheet S, but is generally about 100 mm to 400 mm.
- the clamp mechanism 27 for clamping the steel plate S during end bending is illustrated, but the present invention is not limited to the presence or absence of the clamp mechanism 27.
- FIG. 6 is a cross-sectional view along the conveying direction 1 showing the bending of the width direction ends Sc and Sd of the steel sheet S.
- the steel sheet S is carried in from the left side of the figure and carried out to the right side.
- the lower mold 24 has a flat portion 24a that mainly imparts end bending.
- the flat portion 24a refers to a flat portion in a cross section along the transport direction 1 that extends linearly along the transport direction, and does not mean flat in the cross section in the width direction.
- the shape of the flat portion 24a in the cross section in the width direction is not particularly limited, and may be an arc shape or a linear shape inclined so as to face the inner side in the width direction.
- the effective length of the lower mold 24, that is, the length of the flat portion 24a is set to be larger than the width that gives end bending.
- the length of the flat portion 24a is 3 m to 5 m, and is about 10 times as wide as the end bending. Therefore, a plurality of hydraulic cylinders 26 for pushing up the lower mold 24 are usually arranged along the transport direction.
- a piston type hydraulic cylinder 26 that generates thrust in both upward and downward directions is generally used in combination with a ram type hydraulic cylinder 26 that generates thrust only during upward movement.
- a piston type hydraulic cylinder 26 is arranged in the center of the conveying direction, and a ram type hydraulic cylinder 26 is arranged before and after the cylinder.
- a ram type hydraulic cylinder 26 is arranged before and after the cylinder.
- FIG. 6A shows a state in which the steel sheet S is conveyed by a conveying mechanism 21 by a predetermined conveying distance after the press mechanisms 22A and 22B are bent at the width direction ends Sc and Sd of the steel sheet S. Has been.
- This conveyance distance is set smaller than the length of the flat portion 24a of the lower mold 24.
- the rear end portion of the portion to which end bending has already been applied is positioned on the flat portion 24a of the lower mold 24, and the transition portion between the pre-formed portion and the non-formed portion is formed in the next end bend forming. It is surely bent.
- FIG. 6A shows a state in which the steel sheet S is conveyed by a conveying mechanism 21 by a predetermined conveying distance after the press mechanisms 22A and 22B are bent at the width direction ends Sc and Sd of the steel sheet S. Has been.
- This conveyance distance is set smaller than the length of the flat portion 24a of the lower mold 24.
- the hydraulic cylinder 26 is a lower metal plate in a state in which the steel plate S is arranged so that the rear end portion of the portion to which end bending has already been applied is positioned on the flat portion 24a.
- the mold 24 is pushed up, and the end portions Sc and Sd in the width direction of the steel plate S are bent as shown by solid lines.
- the range bent in the previous step is bent again by the amount corresponding to the spring back, and bending deformation is also caused in the upstream side 2 (left side of the drawing) portion of the steel sheet S that is not located on the flat portion 24a of the lower mold 24.
- the end bend angle at the first end bend is plotted with ⁇
- the end bend angle at the second end bend is plotted with ⁇
- the range of the flat portion 24a of the lower mold at the first end bending is indicated by Ra1
- the range of the flat portion 24a of the lower mold at the second end bending is indicated by Ra2.
- the end bending angle of the front end portion Sa of the steel sheet S is increased (Da), and on the upstream side 2, bending is also applied to a portion outside the flat portion 24a, and the length is about 0.6 m. It has become.
- the portion bent at the first end is further bent and becomes larger toward the downstream side 3 (Dc).
- the end bending angle is slightly increased near the end of the flat portion 24 a, and the bend is applied at a length of about 0.6 m even at a portion off the flat portion 24 a as in the first time.
- the amount by which the lower mold 24 is pushed up is considered to be caused by an inclination (rotation in the pitching direction) that is 2 mm larger on the downstream side 3 and 0.04 degrees with the tip end side facing upward (rotation in the pitching direction).
- FIG. 8A shows the distribution of the deformation of the steel sheet S and the bending deformation force Df (the force that opposes the pressing force P at the time of end bending, and is also simply referred to as “deformation force”) in the first end bending. Is shown schematically. Since there is no steel plate S on the downstream side 3, there is no deformation force Df, and on the upstream side 2, the deformation force Df is generated even at a portion off the flat portion 24 a. For this reason, the center C3 of the deformation force Df is shifted to the upstream side 2 from the center C1 in the transport direction 1 of the flat portion 24a.
- FIG. 8A shows the distribution of the deformation of the steel sheet S and the bending deformation force Df (the force that opposes the pressing force P at the time of end bending, and is also simply referred to as “deformation force”) in the first end bending. Is shown schematically. Since there is no steel plate S on the downstream side 3, there is no deformation force Df, and
- End bending is performed in the state.
- the downstream end of the flat portion 24a comes into contact with the already bent portion, and, for example, as shown in FIG. 7, the steel plate that contacts the downstream end during the second end bending is deformed.
- a large step is formed with the end-bent portion of the downstream side 3 at the first time. That is, the end bend angle fluctuates between the adjacent portions of the steel sheet S with the feeding boundary portion as a boundary. If there is an abrupt change in shape, the welding becomes discontinuous at that portion, and a defect occurs or the welding is interrupted. Therefore, it is desirable that the change in the end bending angle in the longitudinal direction be smooth (small).
- the die on the side of the steel sheet S to be bent is in contact with the outer surface of the bending.
- the lower die 24 is provided with a curved relief portion 24b adjacent to the downstream side 3 of the flat portion 24a, and the flat portion 24a and the relief portion 24b are connected via a common tangent.
- the step becomes smoother as the change in the angle of the escape portion 24b is made smaller as in the involute curve, that is, the curvature change is made continuous.
- a curved relief portion 24c may be provided on the upstream side 2 of the flat portion 24a, and the flat portion 24a and the relief portion 24c may be connected via a common tangent line. Further, at this time, the escape portion 24c needs to prevent the bending deformation length L (see, for example, FIG.
- the length and angle change of the relief portion 24c can be changed so that the range in which the relief portion 24c contacts the steel sheet S is 1/2 or less of the length L at which the bending deformation occurs on the upstream side 2. .
- FIG. 11 show the deformation of the steel sheet S and the distribution of the deformation force Df when the center C1 of the flat portion 24a of the lower mold 24 is shifted by the shift amount d to the downstream side 3 with respect to the center C2 of the pressing force P.
- FIG. 11 shows the first end bending
- FIG. 12 shows the second end bending. It can be seen that the deformation force Df on the upstream side 2 becomes smaller, and the center C3 of the deformation force Df approaches the center C2 of the pressing force P.
- the suitable shift amount d with respect to the center C2 of the press force P of the center C1 of the flat part 24a can be calculated
- the shift amount d of the center C1 of the flat portion 24a is set to 1/4 of the bending deformation length L on the upstream side 2 from the rear end of the flat portion 24a, the center C2 of the pressing force P by the hydraulic cylinder 26 is obtained.
- a symmetrical force acts on the lower mold 24, and the inclination of the lower mold 24 can be minimized.
- the length L at which bending deformation occurs on the upstream side 2 from the rear end of the flat portion 24a differs depending on the end bending amount. If the outer diameter of the steel pipe to be manufactured is small, the width of the steel sheet is also reduced, so that the end bending angle (difference between the inclination angle of the plate end portion 20 mm range and the inclination angle of the width center portion) increases, and bending deformation occurs on the upstream side 2. The resulting length L increases.
- the steel plate width illustrated in FIG. 7 is 2755 mm
- the length L causing the bending deformation on the upstream side 2 is about 0.6 m
- 1 ⁇ 4 of 150 mm is the optimum shift amount d.
- the shift amount d of the center C1 of the flat portion 24a with respect to the center C2 of the pressing force P is preferably set as appropriate according to the width of the steel plate that is the object of end bending, and specifically, the end bending angle described above. It is preferable to set the shift amount d to be larger as the value becomes larger.
- the shift amount d is not more than 1 ⁇ 2 of the length L at which the bending deformation occurs on the upstream side 2.
- the width direction ends Sc and Sd of the tail end portion Sb of the steel sheet S are bent and formed with the center C1 of the flat portion 24a shifted to the downstream side 3 with respect to the center C2 of the pressing force P ( The distribution of the deformation of the steel plate S and the deformation force Df in the final pass) is shown.
- the center C3 of the deformation force Df moves away from the center C2 of the pressing force P (shifts to the downstream side 3) compared to the case of FIGS. 11 and 12, and the lower mold 24 rotates downward on the front side ( (Pitching) force is applied, and the upstream 2 push-up amount increases. Therefore, it is desirable to determine the upper limit of the shift amount d so that the end bending does not become excessive on the tail end portion Sb side of the steel sheet S.
- the lower mold 24 on the side of the end portions Sc and Sd that contacts the outer surface of the bending has a flat portion 24a that abuts the outer surface of the bending of the steel plate S during bending, and the conveying direction of the flat portion 24a 1 in a state where the center C1 at 1 is shifted to the downstream side 3 in the transport direction 1 with respect to the center C2 in the transport direction 1 of the pressing force P generated by the hydraulic cylinder 26.
- the center C3 of the deformation force Df approaches the center C2 of the press force P, so that the inclination of the lower mold 24 during end bend forming can be suppressed, and the steel sheet S in the longitudinal direction can be suppressed. Reduce fluctuations in the amount of bending deformation at the width direction ends Sc and Sd It is possible. Further, the shift of the center C1 of the flat portion 24a with respect to the center C2 of the pressing force P does not introduce new equipment, for example, transports the lower mold 24 to the tool holder 25 and the hydraulic cylinder 26 in existing equipment. It can be realized by shifting to the downstream side 3 in the direction or by shifting the hydraulic cylinder 26 to the upstream side 2 in the transport direction with respect to the lower mold 24.
- the tip end portion Sa and the tail end portion Sb of the steel plate S are portions that become longitudinal ends of the steel pipe product excluding the tab plate St when the tab plate St is present, and Sa and Sb in FIG. It corresponds to.
- the first end (first pass) end bending, when the front end portion Sa of the steel sheet S is positioned behind the front end portion of the flat portion 24a, the bending is performed on the downstream side 3 from that end. Deformation force Df does not occur.
- the center C3 of the deformation force Df is shifted to the upstream side 2 from the center C2 of the pressing force P.
- the front end portion Sa of the steel sheet S By bringing the front end portion Sa of the steel sheet S closer to the front end portion of the flat portion 24a, the amount of deviation between the center C3 of the deformation force Df and the center C2 of the pressing force P is reduced, and fluctuations in the end bending amount can be suppressed.
- the front end portion Sa of the steel plate S is on the downstream side 3 with respect to the front end portion of the flat portion 24a, the portion where the tab plate St is welded is insufficiently bent and welding is not performed at the portion where the tab plate St moves to the steel plate S.
- the position of the front end portion Sa of the steel sheet S is a position that does not exceed the front end portion of the flat portion 24a.
- the bending deformation force Df is higher on the upstream side 2 than that. Does not occur. For this reason, the center C3 of the deformation force Df is shifted to the downstream side 3 from the center C2 of the pressing force P. As shown in FIG.
- the position of the tail end portion Sb of the steel sheet S is preferably set to a position that does not exceed the rear end portion of the flat portion 24a.
- the embodiment of the present invention has been described based on the illustrated example.
- the present invention is not limited to this, and can be appropriately changed, modified, added, and the like within the scope of the claims.
- the lower mold 24 is pushed up by the hydraulic cylinder 26 to press the width direction ends Sc and Sd of the steel sheet S against the upper mold 23 and bending is performed.
- the width direction ends Sc and Sd of the steel sheet S are pressed against the lower mold 24 and bent to the plate in the same direction as in the illustrated example. It is good also as composition which performs.
- the arrangement of the upper mold 23 and the lower mold 24 may be reversed in the direction opposite to the illustrated example, and bending may be performed so that the upper surface of the plate is outside the bend. What is necessary is just to provide an escape part adjacent to the conveyance direction upstream side 2 and downstream side 3 of the flat part of the upper mold
- both the upper mold 23 and the lower mold 24 may be moved in the direction of approaching and separating from each other. In this case, the upper mold 23 and the lower mold 24 are located outside the bend. What is necessary is just to provide an escape part adjacent to the conveyance direction upstream 2 and downstream 3 of the flat part of a type
- the number of hydraulic cylinders 26 for clamping the upper mold 23 and the lower mold 24 is not limited, and the mold clamping can be performed using one, two, three or more hydraulic cylinders 26. Further, the actuator for clamping the upper mold 23 and the lower mold 24 is not limited to the hydraulic cylinder 26, and a mechanical type that performs clamping by converting the rotational motion of the motor into a reciprocating motion by a crank mechanism or the like is used. May be.
- the end bending of the steel sheet was performed under different conditions, and the fluctuation in the longitudinal direction of the end bending and the influence on the welding in the subsequent process were investigated.
- Example 1 A steel plate having a tensile strength of 500 MPa, a plate width of 1676 mm, a plate thickness of 25.4 mm, and a length of 12 m is prepared by attaching a tab plate having a length of 400 mm and a width of 100 mm to the tip and tail ends, and a steel pipe having an outer diameter of 559 mm is prepared.
- Manufactured For the end bending, an end bending apparatus of a type in which the lower mold is pushed up by three hydraulic cylinders (actuators) arranged at an interval of 1000 mm was used.
- the central hydraulic cylinder is a piston type, and the other two are ram types.
- the central hydraulic cylinder is half the output of each of the other hydraulic cylinders, for a total of 15 MN output.
- the upper mold used for end bending has a molding surface with a radius of curvature of 200 mm, and the flat part of the lower mold is linear with an angle of 40 degrees with respect to the horizontal plane in the cross section in the width direction.
- the upper mold has the same cross-sectional shape as the entire length.
- the lower mold has a flat part with a length of 3000 mm and a C25 mm chamfer at both ends in the longitudinal direction (hereinafter referred to as “mold A”), and a continuous part from the flat part with a length of 3000 mm to R1600 mm.
- die B With a gentle relief portion on the downstream side 3 (hereinafter referred to as “die B”), and provided on both the upstream side 2 and the downstream side 3 (hereinafter referred to as “die C”).
- die B a gentle relief portion on the downstream side 3
- die C Three types were used.
- the end bending angle (difference between the inclination angle of the plate edge portion 20 mm range and the inclination angle of the width center portion) is set to 33 ° in the width direction end portion 155 mm of the steel plate, and the end bending is performed four times while feeding the steel plate 2600 mm at a time. After performing, the end bending of the 5th time was performed so that the tail end position of a steel plate might stop in a predetermined position. After end bending, the end bending angle is measured at a pitch of 0.1 m in the longitudinal direction, the maximum and minimum difference in the central 10 m range in the longitudinal direction is the steady portion variation, and the maximum and minimum difference in the total length is the total length variation.
- the angle difference of the step portion having the largest difference is evaluated as the steepness.
- the end bend angle was determined by the difference between the tilt angle in the 20 mm range of the plate end measured using an inclinometer and the tilt angle at the center of the width. Subsequently, U-presses and O-presses were applied, the ends in the width direction of the steel sheets that were formed into a cylindrical shape and end-bent were butted together, and then the abutted width-direction ends were welded together to produce a steel pipe.
- the peaking Dp of the steel pipe was measured at a pitch of 0.1 m in the longitudinal direction.
- the peaking Dp is an index of the sharp shape of the butt portion, and as shown in FIG.
- the peaking Dp Similar to the end bending angle, the peaking Dp also has the maximum and minimum difference in the central 10 m range in the longitudinal direction as the steady portion fluctuation, and the maximum and minimum difference in the total length as the full length fluctuation.
- Table 1 shows the end bending conditions and the molding results.
- the boundary between the steel plate and the tab plate is located at the downstream end of the flat part of the lower mold at the first end bending.
- the case where the boundary between the steel plate and the tab plate is positioned at the upstream end of the flat portion of the lower mold during the end bending is denoted as “steel plate”.
- tab is the case where the entire length of the tab plate is included in the flat portion of the lower mold, and the end of the steel plate is positioned 400 mm inside from the flat portion of the lower mold. .
- the mold C may have a smaller end bending angle variation, but there is almost no difference, at least downstream. It can be seen that the side 3 should have a relief.
- the center C1 in the transport direction of the flat portion of the lower mold is set to be shifted 150 mm (shift amount d) from the center of the central hydraulic cylinder, that is, the center C2 of the pressing force P, to the downstream side 3 in the transport direction.
- shift amount d shifting amount from the center of the central hydraulic cylinder, that is, the center C2 of the pressing force P, to the downstream side 3 in the transport direction.
- conditions 1, 2, 5 were set so that the end bending angle fluctuation and peaking fluctuation of the stationary part matched the center of the flat part of the lower mold with the center of the central hydraulic cylinder. , 6, 9 and 10 or less.
- the end bending angle variation of the steady portion and the end bending angle variation of the full length are Is the same, and the peaking fluctuation of the steady part and the peaking fluctuation of the full length are the same, and the end bending amount is the same over the whole length, whereas the longitudinal end of the steel plate is the flat part of the lower mold.
- the end bending amount at the end portion was large, and the variation in the total length was large.
- the stop position of the end portion in the longitudinal direction of the steel sheet is set as the end portion of the flat portion, and the center C1 of the flat portion is shifted from the center C2 of the pressing force P to the downstream side 3 in the conveying direction.
- condition 1 or “die C” the stop position of the end in the longitudinal direction of the steel plate is the end of the flat part, and the center C1 of the flat part is moved from the center C2 of the pressing force P to the downstream side 3 in the conveying direction.
- the peaking fluctuation is 0.9 to 1.0 mm, which is 1/6 or less of the peaking tolerance ⁇ 3.2 mm required by the API standard, indicating that the shape is excellent.
- Example 2 A steel plate having a tensile strength of 550 MPa, a plate width of 2753 mm, a plate thickness of 38.1 mm, and a length of 12 m is prepared by attaching a tab plate having a length of 400 mm and a width of 100 mm to the tip and tail ends, and a steel pipe having an outer diameter of 914 mm is prepared.
- the upper die used for end bending had a forming surface with a radius of curvature of 335 mm, and end bending was performed in the range of 180 mm in the width direction end of the steel plate with an end bending angle of 24 degrees.
- the other end bending conditions such as an end bending apparatus, a lower mold, and a steel sheet feed amount, were the same as those in Example 1. After the end bending, the end bending angle was measured, and then formed into a cylindrical shape by a bending press method and welded to obtain a steel pipe. Table 2 shows the end bending conditions and the molding results. The items and notations in Table 2 are the same as in Example 1.
- the mold C may have a smaller end bending angle variation, but there is almost no difference, at least downstream. It can be seen that the side 3 should have a relief.
- condition that the center of the flat part of the lower mold in the conveying direction is set to be shifted 150 mm (shift amount d) from the center of the central hydraulic cylinder, that is, the center C2 of the pressing force P to the downstream side 3 in the conveying direction.
- shift amount d shifting amount from the center of the central hydraulic cylinder
- the conditions 1, 2, 5, and 5 are set so that the end bending angle fluctuation and peaking fluctuation of the stationary part are set so that the center of the flat part of the lower mold coincides with the center of the central hydraulic cylinder. It was suppressed to about half of 6, 9 and 10.
- the end bending angle variation of the steady portion and the end bending angle variation of the full length are the same.
- the peaking fluctuation of the steady part and the peaking fluctuation of the full length are the same, and the end bending amount is the same over the entire length, whereas the longitudinal end of the steel plate is placed inside the flat part of the lower mold.
- the end bending amount at the end portion was increased and the variation in the entire length was increased.
- the stop position of the end portion in the longitudinal direction of the steel sheet is set as the end portion of the flat portion, and the center C1 of the flat portion is shifted from the center C2 of the pressing force P to the downstream side 3 in the conveying direction.
- Condition 1 or “die C” is used, the stop position of the end in the longitudinal direction of the steel sheet is set as the end of the flat part, and the center C1 of the flat part is moved from the center C2 of the pressing force P to the downstream side 3 in the conveying direction.
- the peaking fluctuation is 0.8 to 0.9 mm, which is 1/7 or less of the peaking tolerance ⁇ 3.2 mm required by the API standard, and the shape is excellent. Recognize.
- Example 3 A steel plate having a tensile strength of 500 MPa, a plate width of 3232 mm, a plate thickness of 38.1 mm, and a length of 12 m is prepared by attaching a tab plate having a length of 400 mm and a width of 100 mm to the tip and tail ends, and a steel pipe having an outer diameter of 1067 mm. Manufactured.
- the upper mold used for end bending has a molding surface with a radius of curvature of 400 mm. End bending was performed in the range of 195 mm in the width direction end of the steel plate with an end bending angle of 22 degrees as a target.
- end bending conditions such as an end bending apparatus, a lower mold, and a steel sheet feed amount, were the same as those in Example 1. After end bending, the end bending angle was measured, U-pressed and O-pressed, formed into a cylindrical shape, and welded to form a steel pipe. Table 3 shows the end bending conditions and the molding results.
- the mold C may have a smaller end bending angle variation, but there is almost no difference, at least downstream. It can be seen that the side 3 should have a relief.
- the end bending angle variation of the steady portion and the end bending angle variation of the full length are the same.
- the peaking fluctuation of the steady part and the peaking fluctuation of the full length are the same, and the end bending amount is the same over the entire length, whereas the longitudinal end of the steel plate is placed inside the flat part of the lower mold.
- the end bending amount at the end portion was increased and the variation in the entire length was increased.
- the stop position of the end portion in the longitudinal direction of the steel sheet is set as the end portion of the flat portion, and the center C1 of the flat portion is shifted from the center C2 of the pressing force P to the downstream side 3 in the conveying direction.
- condition 1 or “die C” the stop position of the end in the longitudinal direction of the steel plate is the end of the flat part, and the center C1 of the flat part is moved from the center C2 of the pressing force P to the downstream side 3 in the conveying direction.
- the peaking fluctuation is 0.7 to 0.8 mm, which is 1/8 or less of the peaking tolerance ⁇ 3.2 mm required by the API standard, and the shape is excellent. Recognize.
- condition numbers 9 and 10 that do not satisfy the conditions of the present invention the fluctuations in peaking and end bending angle were larger than those of the present invention example.
- an increase in the end bend angle difference means that a sudden change has occurred in the step portion of the feed boundary, and this sudden change exceeded the copying limit of the welding torch, so that the welding was stopped urgently.
- Example 4 As in Example 2, a steel plate having a tensile strength of 550 MPa, a plate width of 2753 mm, a plate thickness of 38.1 mm, and a length of 12 m was prepared by attaching a tab plate having a length of 400 mm and a width of 100 mm to the tip and tail ends, respectively. A steel pipe having an outer diameter of 914 mm was manufactured.
- the upper mold used for end bending has a molding surface with a curvature radius of 335 mm, and the flat portion of the lower mold has a molding surface with a curvature radius of 335 mm so as to overlap the upper mold.
- the upper mold has the same cross-sectional shape as the entire length.
- the lower mold has a flat part with a length of 3000 mm and a C25 mm chamfer at both ends in the longitudinal direction (hereinafter referred to as “mold A”), and a continuous part from the flat part with a length of 3000 mm to R1200 mm.
- mold A flat part with a length of 3000 mm and a C25 mm chamfer at both ends in the longitudinal direction
- die B a gentle relief portion on the downstream side 3
- die C provided on both the upstream side 2 and the downstream side 3
- end bending was performed in the range of 180 mm in the width direction end of the steel plate with an end bending angle of 24 degrees.
- Example 2 The other end bending conditions, such as the end bending apparatus and the steel sheet feed amount, were the same as in Example 2. After the end bending, the end bending angle was measured, and then formed into a cylindrical shape by a bending press method and welded to obtain a steel pipe. Table 4 shows the end bending conditions and the molding results. The items and notations in Table 4 are the same as in Example 1.
- the mold C may have a smaller end bending angle variation, but there is almost no difference, at least downstream. It can be seen that the side 3 should have a relief.
- the center C1 in the transport direction of the flat portion of the lower mold is set to be shifted 150 mm (shift amount d) from the center of the central hydraulic cylinder, that is, the center C2 of the pressing force P, to the downstream side 3 in the transport direction.
- conditions 3, 4, 7 and 8 conditions 1, 2, 5 were set so that the end bend angle fluctuation and peaking fluctuation of the stationary part matched the center of the flat part of the lower mold with the center of the central hydraulic cylinder. , 6, 9 and 10.
- the end bending angle variation of the steady portion and the end bending angle variation of the full length are the same.
- the peaking fluctuation of the steady part and the peaking fluctuation of the full length are the same, and the end bending amount is the same over the entire length, whereas the longitudinal end of the steel plate is placed inside the flat part of the lower mold.
- the end bending amount at the end portion was increased and the variation in the entire length was increased.
- the stop position of the end portion in the longitudinal direction of the steel plate is the end portion of the flat portion, and the center of the flat portion is shifted from the center C2 of the pressing force P to the downstream side 3 in the conveying direction.
- the stop position of the end in the longitudinal direction of the steel sheet is set as the end of the flat part, and the center of the flat part is shifted from the center C2 of the pressing force P to the downstream side 3 in the conveying direction.
- the peaking fluctuation is 0.8 to 0.9 mm, which is 1/7 or less of the peaking tolerance ⁇ 3.2 mm required by the API standard, which shows that the shape is excellent.
- Example 5 As in Example 3, a steel plate having a tensile strength of 500 MPa, a plate width of 3232 mm, a plate thickness of 38.1 mm, and a length of 12 m was prepared by attaching a tab plate having a length of 400 mm and a width of 100 mm to the tip and tail ends, respectively. A steel pipe having an outer diameter of 1067 mm was manufactured.
- the upper die used for end bending has a molding surface with a radius of curvature of 400 mm, and the flat portion of the lower die has a molding surface with a radius of curvature of 400 mm so as to overlap the upper die.
- the upper mold has the same cross-sectional shape as the entire length.
- the lower mold has a flat part with a length of 3000 mm and a C25 mm chamfer at both ends in the longitudinal direction (hereinafter referred to as “mold A”), and a continuous part from the flat part with a length of 3000 mm to R1200 mm.
- mold A flat part with a length of 3000 mm and a C25 mm chamfer at both ends in the longitudinal direction
- die B a gentle relief portion on the downstream side 3
- die C provided on both the upstream side 2 and the downstream side 3
- end bending was performed with an end bending angle of 22 degrees in the range of 195 mm in the width direction end of the steel sheet.
- Example 3 The other end bending conditions, such as the end bending apparatus and the steel sheet feed amount, were the same as in Example 3. After the end bending, the end bending angle was measured, and then formed into a cylindrical shape by a bending press method and welded to obtain a steel pipe. Table 5 shows the end bending conditions and the molding results. The items and notations in Table 5 are the same as in Example 1.
- the mold C may have a smaller end bending angle variation, but there is almost no difference, at least downstream. It can be seen that the side 3 should have a relief.
- the center C1 in the transport direction of the flat portion of the lower mold is set to be shifted 150 mm (shift amount d) from the center of the central hydraulic cylinder, that is, the center C2 of the pressing force P, to the downstream side 3 in the transport direction.
- conditions 3, 4, 7 and 8 conditions 1, 2, 5 were set so that the end bend angle fluctuation and peaking fluctuation of the stationary part matched the center of the flat part of the lower mold with the center of the central hydraulic cylinder. , 6, 9 and 10.
- the end bending angle variation of the steady portion and the end bending angle variation of the full length are the same.
- the peaking fluctuation of the steady part and the peaking fluctuation of the full length are the same, and the end bending amount is the same over the entire length, whereas the longitudinal end of the steel plate is placed inside the flat part of the lower mold.
- the end bending amount at the end portion was increased and the variation in the entire length was increased.
- the stop position of the end portion in the longitudinal direction of the steel sheet is set as the end portion of the flat portion, and the center C1 of the flat portion is shifted from the center C2 of the pressing force P to the downstream side 3 in the conveying direction.
- Condition 1 or “die C” is used, the stop position of the end in the longitudinal direction of the steel sheet is the end of the flat part, and the center C1 of the flat part is moved from the center C2 of the pressing force P to the downstream side 3 in the conveying direction.
- the peaking fluctuation is 0.7 to 0.8 mm, which is 1/8 or less of the peaking tolerance ⁇ 3.2 mm required by the API standard, and the shape is excellent. Recognize.
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Abstract
Description
長さ400mm×幅100mmのタブ板を先端部および尾端部にそれぞれ取付けた、引張強度500MPa、板幅1676mm×板厚25.4mm×長さ12mの鋼板を用意し、外径559mmの鋼管を製造した。端曲げには間隔1000mmで配置された3本の油圧シリンダ(アクチュエータ)で下金型を押し上げる方式の端曲げ装置を用いた。中央の油圧シリンダはピストンタイプであり、他の2本はラムタイプである。中央の油圧シリンダは他の各油圧シリンダの半分の出力であり、3つ合計で15MNの出力である。
長さ400mm×幅100mmのタブ板を先端部および尾端部にそれぞれ取付けた、引張強度550MPa、板幅2753mm×板厚38.1mm×長さ12mの鋼板を用意し、外径914mmの鋼管を製造した。端曲げに用いた上金型は曲率半径335mmの成形面を有し、鋼板の幅方向端部180mmの範囲に端曲げ角度24度を目標に端曲げを行った。その他の端曲げの条件である端曲げ装置や下金型、鋼板送り量は実施例1と同じとした。端曲げ後にその端曲げ角度を測定した後、ベンディングプレス方式で円筒形に成形し、溶接を行い鋼管とした。端曲げ条件とその成形結果を表2に示す。表2中の項目および表記は実施例1と同じである。
長さ400mm×幅100mmのタブ板を先端部および尾端部にそれぞれ取付けた、引張強度500MPa、板幅3232mm×板厚38.1mm×長さ12mの鋼板を用意し、外径1067mmの鋼管を製造した。端曲げに用いた上金型は曲率半径400mmの成形面を有する。鋼板の幅方向端部195mmの範囲に端曲げ角度22度を目標に端曲げを行った。その他の端曲げの条件である端曲げ装置や下金型、鋼板送り量は実施例1と同じした。端曲げ後にその端曲げ角度を測定し、UプレスおよびOプレスを施して円筒形に成形し、溶接を行い鋼管とした。端曲げ条件とその成形結果を表3に示す。
実施例2と同様に、長さ400mm×幅100mmのタブ板を先端部および尾端部にそれぞれ取付けた、引張強度550MPa、板幅2753mm×板厚38.1mm×長さ12mの鋼板を用意し、外径914mmの鋼管を製造した。端曲げに用いた上金型は曲率半径335mmの成形面を有し、下金型の平坦部は、上金型と重なるように曲率半径335mmの成形面を有している。上金型は全長同一の断面形状である。下金型には、平坦部の長さが3000mmでその長手方向両端にC25mmの面取りを施したもの(以下、「金型A」と呼ぶ)と、長さ3000mmの平坦部から連続してR1200mmの緩やかな逃げ部を下流側3に設けたもの(以下、「金型B」と呼ぶ)、上流側2および下流側3の双方に設けたもの(以下、「金型C」と呼ぶ)の3種類を用い、鋼板の幅方向端部180mmの範囲に端曲げ角度24度を目標に端曲げを行った。
実施例3と同様に,長さ400mm×幅100mmのタブ板を先端部および尾端部にそれぞれ取付けた、引張強度500MPa、板幅3232mm×板厚38.1mm×長さ12mの鋼板を用意し、外径1067mmの鋼管を製造した。端曲げに用いた上金型は曲率半径400mmの成形面を有し、下金型の平坦部は、上金型と重なるように曲率半径400mmの成形面を有している。上金型は全長同一の断面形状である。下金型には、平坦部の長さが3000mmでその長手方向両端にC25mmの面取りを施したもの(以下、「金型A」と呼ぶ)と、長さ3000mmの平坦部から連続してR1200mmの緩やかな逃げ部を下流側3に設けたもの(以下、「金型B」と呼ぶ)、上流側2および下流側3の双方に設けたもの(以下、「金型C」と呼ぶ)の3種類を用い、鋼板の幅方向端部195mmの範囲に端曲げ角度22度を目標に端曲げを行った。
2 上流側
3 下流側
10 エッジミラー
20 鋼板の端曲げ装置
21 搬送機構
21a 搬送ロール
22A、22B プレス機構
23 上金型
24 下金型
24a 平坦部
24b、24c 逃げ部
26 油圧シリンダ
30 円筒成形装置
30A Uプレス
30B Oプレス
30C ベンディングプレス
40 接合装置
50 メカニカルエキスパンダ
S 鋼板
Sa 先端部
Sb 尾端部
Sc、Sd 幅方向端部
St タブ板
Sp 製品鋼管形状
Se 仮想真円
Ra1 1回目の下金型の平坦部24aの範囲
Ra2 2回目の下金型の平坦部24aの範囲
Da 鋼板端部での角度変動
Dc 定常部での角度変動
Df 変形力
P 油圧(プレス力)
Dp ピーキング
Dp- マイナスピーキング
Dp+ プラスピーキング
Claims (8)
- 鋼板の幅方向端部に対応して配置された一対の金型と、
前記一対の金型を所定のプレス力で型締めするアクチュエータと、
鋼板をその長手方向に沿った方向を搬送方向として搬送する搬送機構と、を備える鋼板の端曲げ装置を用い、前記搬送機構により鋼板を間欠的に搬送しながら、前記一対の金型により鋼板の幅方向端部の曲げ成形を複数回行うことで、鋼板の幅方向端部に全長に亘って曲げ成形を施す鋼板の端曲げ方法であって、
前記一対の金型のうち、曲げ成形される鋼板の幅方向端部の、曲げの外側となる面に接する側の金型が、前記曲げの外側となる面に当接する平坦部と、該平坦部の、前記搬送方向の少なくとも下流側に隣接して設けられた曲面からなる逃げ部とを有し、かつ、前記平坦部と前記逃げ部とが共通の接線を有して接続されている一対の金型を用いて、鋼板の幅方向端部に曲げ成形を行うことを特徴とする鋼板の端曲げ方法。 - 前記平坦部の、前記搬送方向での中心を、前記アクチュエータが発生する前記プレス力の、前記搬送方向での中心に対して前記搬送方向で下流側にずらした状態で鋼板の幅方向端部に曲げ成形を行うことを特徴とする、請求項1に記載の鋼板の端曲げ方法。
- 鋼板の幅方向端部への曲げ成形の最初のパスにて、前記搬送方向における鋼板の先端部を前記平坦部の前方端に合わせた位置とすることを特徴とする、請求項1または2に記載の鋼板の端曲げ方法。
- 鋼板の幅方向端部への曲げ成形の最後のパスにて、前記搬送方向における鋼板の尾端部を前記平坦部の後方端に合わせた位置とすることを特徴とする、請求項1から3までのいずれか一項に記載の鋼板の端曲げ方法。
- 鋼板の幅方向端部に対応して配置された一対の金型と、前記一対の金型を所定のプレス力で型締めするアクチュエータと、鋼板をその長手方向に沿う方向を搬送方向として搬送する搬送機構と、を備える鋼板の端曲げ装置を用い、前記搬送機構により鋼板を間欠的に搬送しながら、前記一対の金型により鋼板の幅方向端部の曲げ成形を複数回行うことで、鋼板の幅方向端部に全長に亘って曲げ成形を施す鋼板の端曲げ工程と、
両幅方向端部に曲げ成形が施された鋼板を円筒形に成形し、鋼板の幅方向端部同士を突き合わせる円筒成形工程と、
突き合わされた鋼板の幅方向端部同士を溶接する接合工程と、を含む鋼管の製造方法であって、
前記端曲げ工程として、請求項1から4までの何れか一項記載の鋼板の端曲げ方法を用いることを特徴とする鋼管の製造方法。 - 鋼板の幅方向端部に対応して配置された一対の金型と、
前記一対の金型を所定のプレス力で型締めするアクチュエータと、
鋼板をその長手方向に沿った方向を搬送方向として搬送する搬送機構と、を備え、前記搬送機構により鋼板を間欠的に搬送しながら、前記一対の金型により鋼板の幅方向端部の曲げ成形を複数回行うことで、鋼板の幅方向端部に全長に亘って曲げ成形を施す鋼板の端曲げ装置であって、
前記一対の金型のうち、曲げ成形される鋼板の幅方向端部の、曲げの外側となる面に接する側の金型は、前記曲げの外側となる面に当接する平坦部と、該平坦部の、前記搬送方向の少なくとも下流側に隣接して設けられた曲面からなる逃げ部とを有し、かつ、前記平坦部と前記逃げ部とが共通の接線を有して接続されていることを特徴とする鋼板の端曲げ装置。 - 前記一対の金型のうちの前記曲げの外側となる面に接する側の金型において、前記平坦部の、前記搬送方向での中心が、前記アクチュエータが発生する前記プレス力の、前記搬送方向での中心に対して前記搬送方向で下流側にずらされていることを特徴とする、請求項6に記載の鋼板の端曲げ装置。
- 鋼板の幅方向端部に対応して配置された一対の金型と、前記一対の金型を所定のプレス力で型締めするアクチュエータと、鋼板をその長手方向に沿った方向を搬送方向として搬送する搬送機構と、を有し、前記搬送機構により鋼板を間欠的に搬送しながら、前記一対の金型により鋼板の幅方向端部へ曲げ成形を複数回行うことで、鋼板の幅方向端部に全長に亘って曲げ成形を施す鋼板の端曲げ装置と、
両幅方向端部に曲げ成形が施された鋼板を円筒形に成形し、鋼板の幅方向端部同士を突き合わせる円筒成形装置と、
突き合わされた鋼板の幅方向端部同士を溶接する接合装置と、を備える鋼管の製造設備であって、
前記鋼板の端曲げ装置として、請求項6または7に記載の鋼板の端曲げ装置を備えることを特徴とする鋼管の製造設備。
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