EP3127624B1 - Outil de formation par pliage-presse - Google Patents

Outil de formation par pliage-presse Download PDF

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Publication number
EP3127624B1
EP3127624B1 EP15772740.5A EP15772740A EP3127624B1 EP 3127624 B1 EP3127624 B1 EP 3127624B1 EP 15772740 A EP15772740 A EP 15772740A EP 3127624 B1 EP3127624 B1 EP 3127624B1
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EP
European Patent Office
Prior art keywords
circular arc
bending
punch
plate material
radius
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EP15772740.5A
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German (de)
English (en)
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EP3127624A1 (fr
EP3127624A4 (fr
Inventor
Masayuki Horie
Isamu Yasuhara
Yukuya TAMURA
Kenji TANIICHI
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JFE Steel Corp
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JFE Steel Corp
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Publication of EP3127624A4 publication Critical patent/EP3127624A4/fr
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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
    • 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
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides

Definitions

  • the present invention relates to a bending-press forming tool which is suitable for efficiently producing a thick steel pipe of a large diameter, for example, used for a line pipe or the like, by successively pressing and bending a plate material along its feeding direction through a three-point bending-press.
  • UOE forming technique of press-working a steel plate having a predetermined length, width and plate thickness into a U-shape, press-forming the steel plate into an O-shape, butt-jointing the end portions thereof by welding to form a steel pipe, and further expanding its diameter (so-called tube expansion) so as to enhance the roundness.
  • a bending-press forming technique has been put into practical use which performs the bending (edge bending) of the end portions in a widthwise direction of the steel plate in advance, then, forms the steel plate into a substantially circular shape by performing three-point bending-press a plurality of times, and further corrects the shape to form a steel pipe.
  • FIG. 9 is a view illustrating an embodiment of performing such a bending-press forming.
  • the reference number 101 in FIG. 9 indicates a die disposed within a conveying pathway of a plate material S.
  • the die 101 includes a pair of left and right rod-shaped members 101a and 101b which support the plate material S at two points along the conveying direction, and a distance e between the left and right rod-shaped members can be changed depending on the size of the steel pipe to be formed. However, in the course of producing an open pipe by press-forming the plate material S, the distance e is not changed.
  • a punch 102 is movable in a direction which gets close to and away from the die 101.
  • the punch 102 includes a punch head 102a having a downward convex working surface K which comes into direct contact with the plate material S to press the plate material S into a concave shape, and a punch supporter 102b which leads to the back of the punch head 102a and supports the punch head 102a.
  • the maximum width of the punch head 102a is generally equal to the width (thickness) of the punch supporter 102b.
  • a roller 103 forms a conveying pathway of the plate material S.
  • Patent Document 1 discloses a method wherein press-forming of a steel plate is conducted in the widthwise direction by performing the bending on both end portions and a specific intermediate portion in the widthwise direction of the steel plate such that each of the straight portions of desired lengths remain and a portion between the straight portions is a circular arc portion, simultaneously welding a joint portion to form a semi-forming round steel pipe, and after heating the entire semi-forming round steel pipe, performing the hot-forming throughout the plurality of forming rolls in which the forming surface has a semicircular shape corresponding to the final radius to thereby adjust a shape.
  • a formed body after the press-forming has a shape close to a square, and it is essential to separately provide a process (hot) for correcting the shape, so that there is a problem of causing a significant increase in the production cost when including the consumption of thermal energy applied to the heating.
  • Patent document 2 discloses a method of reducing the number of times of bending in three-point bending-press, while diminishing the stress acting on a connecting portion between a punch head and a bending board for supporting the punch head (corresponding to the punch supporter).
  • the tubular body in the form of having a gap in which the plate material is formed into a cylindrical shape and the plate width end portions facing each other are not welded, when welding the plate width end portions facing each other (hereinafter, such a site is also referred to as a seam portion), it is necessary to deform the tubular body by applying force from the outside of the tubular body and to eliminate the gap by mutually butting the plate width end portions facing each other.
  • the bending-press forming as the gap between the plate width end portions is small, force required to butt the plate width end portions each other is small, and a bad shape such as roundness drop is also hard to occur. In this way, there has been an increasing demand for the technique of suppressing an increase in the width (thickness) of the punch supporter as much as possible while expanding the working width of the punch head in the bending-press forming.
  • an object of the present invention is to provide a bending-press forming tool capable of efficiently performing the bending, without causing wear and deformation of a punch or without impairing the product quality, in the production of the steel pipe from the plate material by the three-point bending-press.
  • the present invention provides a bending-press forming tool according to claim 1.
  • the punch head is provided with a working surface having a working surface center which matches an axis of the punch supporter and being formed by a non-uniform circular arc having a radius in a central region in the widthwise direction as a maximum radius.
  • the non-uniform circular arc is the continuous circular arc or the discontinuous circular arc obtained by combining at least two arcs with different radii, so that the width end of the working surface of the punch head does not strongly come into contact with the plate material at the time of bending. Therefore, it is possible to avoid an excessive bending moment which causes the deformation and damage to the punch. Also, it is relatively easy to form a working surface.
  • the working surface of the punch head can be easily formed by making the non-uniform circular arc of an involute curve.
  • the continuous circular arc and the discontinuous circular arc are constituted of a main circular arc having a radius corresponding to an inner diameter of a steel pipe to be worked and laterally equivalent working widths with respect to the working surface center, and a sub circular arc connecting with a width edge of the main circular arc and having a radius smaller than the radius of the main circular arc.
  • the working width of a region in which a circular arc primarily contributing to bending is formed is set to less than 0.90 times the feed pitch of the plate material, whereby an excessive bending moment does not occur in the punch. Accordingly, the life of the punch is extended to enable the stable bending over the long period of time, and the roundness of the steel pipe can be enhanced.
  • the non-uniform circular arc is a continuous circular arc or a discontinuous circular arc and the continuous circular arc or the discontinuous circular arc is constituted of the main circular arc and the sub circular arc
  • the main circular arc primarily contributes to the bending, it is possible to suppress an occurrence of excessive bending moment by setting the working width of the region formed with the main circular arc to be less than 0.90 times the feed pitch of the plate material.
  • FIG. 1 is a schematic view illustrating an embodiment of a bending-press forming tool according the present invention.
  • a die 1 is disposed within a conveying pathway of a plate material S.
  • the die 1 includes a pair of left and right rod-shaped members 1a and 1b which support the plate material S at two locations along the feeding direction, and its distance e can be changed depending on the size of the steel pipe to be formed. However, in the course of producing a single open pipe by press-forming a plate material S, the distance e is not changed.
  • a punch 2 is movable in a direction which gets come to and away from the die 1.
  • the punch 2 includes a punch head 2a which has a downward convex working surface K coming into direct contact with the plate material S to press the plate material into a concave shape, and a punch supporter 2b which leads to the back of the punch head 2a and supports the punch head 2a.
  • rollers 3 form a conveying pathway of the plate material S.
  • a specific structure of the punch supporter 2b of the punch 2 is not illustrated, but its upper end portion is connected to a driving means such as a hydraulic cylinder so as to be able to apply the pressing force to the punch head 2a by the driving means.
  • a driving means such as a hydraulic cylinder
  • a width (thickness) of the punch supporter 2b is appropriately designed by thickness and strength of the plate material S as a material to be formed and a shape of a tubular body to be formed. Also, since the punch supporter 2b may come into contact with the end portion of the plate material S, it is possible to provide a replaceable wearing plate on the surface of the punch supporter 2b. The wearing plate is preferable since it can be used for a long period of time without wearing the punch supporter 2b by appropriately exchanging it.
  • the punch head 2a of the punch 2 has a working surface center O which matches an axis q of the punch supporter 2b, and a working surface K provided at its head is formed with a non-uniform circular arc which has a radius r 1 as a maximum radius in the central region in the widthwise direction (other regions have a radius r 2 which is smaller than the radius r 1 ).
  • the non-uniform circular arc defined in the present invention refers to a circular arc provided by a combination as illustrated in FIGs. 3(a) to 3(c) in which at least two arcs having the different radii are combined with each other, that is, a circular arc which includes a circular arc of the radius r 1 positioned at the working surface center O (hereinafter, this circular arc is called a main circular arc K 1 ) and a circular arc having a smaller radius r 2 than that of the main circular arc K 1 (hereinafter, this circular arc is called a sub circular arc K 2 ).
  • a circular arc which includes a circular arc of the radius r 1 positioned at the working surface center O hereinafter, this circular arc is called a main circular arc K 1
  • a circular arc having a smaller radius r 2 than that of the main circular arc K 1 hereinafter, this circular arc is called a sub circular arc K 2 ).
  • (a) is a circular arc which has a common tangent at a connecting point between the main circular arc K 1 and the sub circular arc K 2 (when an angle formed by the tangent of the main circular arc K 1 and the tangent of the sub circular arc K 2 is 0°)
  • (b) is a circular arc in which the tangent of the main circular arc K 1 and the tangent of the sub circular arc K 2 are connected to each other while forming an angle (the angle is not 0°)
  • (c) is a circular arc in which an angle formed by the tangent of the main circular arc K 1 and the tangent of the sub circular arc K 2 is 0° but they are connected to each other via a step d.
  • the circular arc as illustrated in (a) will be referred to as a continuous circular arc (including a circular arc such as an involute curve or the like, in which a radius gradually is changed while having a common tangent), and the circular arcs as illustrated in (b) and (c) will be referred to as a discontinuous circular arc.
  • the discontinuous circular arc also includes one in which the radius of the circular arc gradually is changed.
  • the punch 2 is basically configured to include the punch head 2a and the punch supporter 2b, but it is possible to interpose a spacer (not illustrated) between the punch head 2a and the punch supporter 2b.
  • a spacer By interposing the spacer therebetween, for example, when finely adjusting a mounting angle of the punch head 2a to the punch supporter 2b, the mounting angle can be adjusted to an appropriate angle only by adjusting the shape of the spacer rather than the punch supporter 2b itself.
  • the punch head 2a is divided in the longitudinal direction of the die 1, it is possible to improve the handling efficiency when storing the punch heads 2a or when mounting the punch heads 2a to the punch supporter 2b by holding the plurality of divided punch heads 2a with a single spacer. Since there are advantages as described above, it is preferable to interpose a spacer (not illustrated) between the punch head 2a and the punch supporter 2b.
  • the plate material S is placed on the die 1, and in such a manner as illustrated in FIG. 4 , the plate material S may be successively subjected to the three-point bending both on the left and right sides from the edge in the widthwise direction towards the center by the punch 2 while intermittently feeding the plate material S by a predetermined feed pitch.
  • FIG. 4 illustrates a manner as illustrated in FIG. 4 .
  • FIG. 4 is a schematic view illustrating a process of forming an open pipe as illustrated in the right lowest view, by performing the bending of the plate material S which has been subjected to edge bending (to be described below) in advance, from the top to the bottom of the left column, then, from the top to the bottom of the center column, and further from the top to the bottom of the right column, and by performing the feeding of the plate material S.
  • open arrows assigned to the plate material S or the punch 2 indicate the directions of movement of the plate material S or the punch 2 in each process.
  • the plate material S comes into contact with the die 1 in the state of being entirely inclined, and the plate material S is deformed in the state of left-right asymmetrical with respect to the working surface center O of the punch head 2a.
  • the working surface K has the non-uniform circular arc and the radius of the sub circular arc K 2 is smaller than the radius of the main circular arc K 1 as illustrated in FIG. 2 , it is possible to narrow the asymmetric range compared to a punch having a single working surface, and therefore, even when the bending of the plate material S progresses, the load in the width end region of the punch head 2a is not extremely increased, and as a result, an occurrence of the excessive bending moment can be suppressed.
  • the main circular arc K 1 formed on the working surface K has laterally equivalent contact lengths with respect to the working surface center O as a starting point.
  • main circular arc K 1 and the sub circular arc K 2 are constituted of a continuous circular arc or a discontinuous circular arc, the number of circular arcs is not particularly limited.
  • the working width of the working surface K in the region formed by a circular arc primarily contributing to the bending is preferably less than 0.90 times the feed pitch of the plate material so as to diminish the bending moment occurring in the punch 2 and decrease the number of times of pressing to achieve the efficient bending (when the working width of the region formed with a circular arc primarily contributing to the bending is set to n i and the feed pitch of the plate material S is set to ⁇ , a ratio (n i / ⁇ ) of the working width n i and the feed pitch ⁇ of the plate material S is less than 0.90 times).
  • the main circular arc K 1 primarily contributes to the bending, so that the working width of the region formed by the main circular arc K 1 is set to less than 0.90 times the feed pitch ⁇ of the plate material.
  • the working width n i of the region formed with the circular arc primarily contributing to the bending refers to a length (length of a circular arc) on the working surface K corresponding to a range of the target bending formation amount ⁇ i as illustrated in FIG. 6 .
  • the target bending formation amount ⁇ i is (360° - 2 ⁇ edge bending angle)/N is a measure of the amount of the bending formation per time.
  • the number of times of bending N is normally not less than 3, so that 120° which is the value calculated when the edge bending angle is assumed to be 0° is sufficient as the target value of the amount of the bending formation per time. Accordingly, the bending formation amount on the working surface K of the punch 2 being set not more than 120° (corresponding to not more than 60° on each side from the working surface center O of the punch 2), or may be further decreased to not more than 90° (corresponding to not more than 45° on each side from the working surface center O of the punch 2).
  • the edge bending (also referred to as crimping) is performed on the plate width end portions of the plate material prior to the bending-press forming. This is implemented in order to ensure good roundness of the plate width end portions which are relatively hard to bend as compared to the case of performing the bending of the plate width central portion in the bending-press forming. Further, since the plate material has a pipe shape by performing the bending of 360° together with the subsequent bending-press forming, in the bending-press forming, the bending is applied except for the amount given by the edge bending.
  • the bending formation amount (angle) ⁇ i per time in the bending press is (360° - 2 ⁇ edge bending angle)/N, and the range applied with the bending per time is the feed amount (feed pitch).
  • the plate material is formed into a pipe shape by giving the bending formation amount ⁇ i every feed pitch.
  • the shape of the range of the bending formation amount (central angle) ⁇ i is transferred onto the punch head 2a to obtain the shape after the bending press.
  • the length (peripheral length (or circular arc length)) along the working surface K of the section of the bending formation amount ⁇ i approaches the feed pitch of the plate material, the portion to which the radius of curvature is given is widened, and the good roundness can be secured.
  • the working width n i of the region formed with the circular arc primarily contributing to the bending is set to less than 0.90 times the feed amount (length) of the plate material.
  • the radius of curvature of the bent portion of the plate material S is also decreased.
  • a bending forming portion having a radius of curvature locally smaller than that of other portions is also formed in the tubular body which is made of the plate, so that the shape is degraded if the portion remains in the product as it is.
  • the radius of the sub circular arc K 2 of the working surface K is smaller than the radius of the main circular arc K 1 , it is necessary to pay attention to the occurrence of such a failure. For that reason, the bending range of the sub circular arc K 2 is preferably set to not more than 15° at the central angle of the sub circular arc K 2 .
  • the working width (distance) n i of the region where the circular arc primarily contributing to the bending is formed depending on the specifications (strength, thickness, size and shape) of the target product.
  • the three-point bending is performed from each of both the left and right sides toward the center of the steel plate based on the conditions of a feed pitch 298 mm/time, a bending formation amount 29.6°/time and five times of press by using a position of one side 1492 mm from the center of the steel plate (the center of the dimension along the feeding direction) as the bending start point.
  • the bending is performed using a die where a radius of the head is set to 75 mm and a distance e (distance between centers) between the rod-shaped members 1a and 1b is set to 550 mm.
  • the punch head having the width of 400 mm is used, and the punch supporter having a width (thickness) of the body portion of 100 mm and a receiving portion of the width 400 mm to fix and hold the punch head to the tip is used for supporting it as illustrated in FIG. 7 .
  • a strain gauge is attached to an end portion (start site of R) of R having the radius of 50 mm provided in the connecting portion between the body portion and the receiving portion, thereby measuring the stress acting on the punch supporter 2b by the gauge.
  • the form of the working surface is a continuous circular arc in the item of Table 1 when performing the bending by the use of a punch head having a working surface in which the main circular arc and the sub circular arc are connected to each other with an angle of 0° formed between the tangent of the main circular arc and the tangent of the sub circular arc, at the position of the angle of 15° from the working surface center O of the punch head.
  • the form of the working surface is an involute when performing the bending by the use of a punch head having a working surface in which the radius is gradually decreased as being remote from the working surface center O of the punch head by the involute curve.
  • the radius of the main circular arc indicates the value of the radius in the working surface center O (that is, the maximum value of the radius), and the radius of the sub circular arc indicates the position which is remote from the working surface center O by 1/2 of the bending formation amount ⁇ i : 29.6°, that is, the minimum value of the radius of the range primarily contributing to the bending, respectively.
  • the form of the working surface is a discontinuous circular arc when performing the bending by the use of a punch head having a working surface in which the main circular arc and the sub circular arc are connected to each other with a difference of 6° of the angles formed between the tangent of the main circular arc and the tangent of the sub circular arc at the positions of 15° from the working surface center O of the punch head 2a.
  • the stress acting on the punch supporter indicates the largest value in the 11 times of bending.
  • Table 1 are shown values obtained by dividing the stress acting on the punch supporter by a basic allowable stress range in 2 ⁇ 10 6 times of stress repetition based on "Fatigue design guideline and commentary of steel structure (Hagane-Kouzou no Hirou Sekkei Shishin ⁇ Dou Kaisetsu)" edited by Japanese Society of Steel Construction, regarding the punch supporter, that is, the ratio of stress acting on the punch supporter to the basic allowable stress range.
  • a case where the stress acting on the punch supporter is lower than the fatigue limit stress that is, a case where the ratio of the stress acting on the punch supporter to the fatigue limit stress is less than 1, is indicated by ⁇ (excellent), a case where the ratio of stress is not more than 1.25 is indicated by ⁇ (allowable), and a case where the ratio is more than that value is indicated by ⁇ (unallowable).
  • the ratio 1.25 of the stress in which the number of times of stress repetition is not less than 1 ⁇ 10 6 is a threshold value.
  • the evaluation of the steel pipe in Table 1 is carried out for local roundness.
  • the local roundness is measured by, for example, using a dial gauge 4 having a pair of leg portions 4a and 4b with an inter-leg distance of D as illustrated in FIG. 8(a) , by contacting leg ends 4c, 4d of the leg portions 4a, 4b with the peripheral surface of the resultant steel pipe and simultaneously contacting a probe (not illustrated) provided at the tip of a spindle 4e with the peripheral surface of the steel pipe, and by reading a radial displacement from a virtual perfect circle as a target shape of the steel pipe. It means that the circle gets close to a perfect circle as the value is smaller.
  • a dial gauge having an inter-leg distance D of 150 mm is used to measure the local roundness as illustrated in FIG. 8(b) along the circumferential direction of the peripheral surface of the steel pipe and obtain the maximum value of the measured local roundness.
  • a case where the value is not more than the tolerance 2.0 mm of API-2B of the API standard as a typical standard of the steel pipe is indicated by ⁇ (excellent)
  • a case where the value is not more than the tolerance 3.2 mm of API-5L is indicated by ⁇ (good)
  • the ratio of stress applied to the punch supporter during bending is not more than 1.25, and the deformation and damage of the punch is not observed.
  • the local roundness of the steel pipe formed by the punch Nos. A to H is not more than 2.3 mm and sufficiently satisfies the standard API.
  • the local roundness of the steel pipe is not more than 2.0 mm and satisfied the strict 2B standard in the API standard, and it is found clear that a steel pipe of high quality can be formed without adding extra processes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Claims (6)

  1. Outil de formation par pliage-presse comprenant : des matrices (l) qui sont disposées à intervalles le long d'une direction d'alimentation d'un matériau en plaque (S) pour soutenir le matériau en plaque (S) à deux emplacements et un poinçon (2) qui est mobile dans une direction pour se rapprocher ou s'éloigner des matrices (1) et appuie séquentiellement sur le matériau en plaque (S) soutenu par les matrices (1) le long de la direction d'alimentation pour exécuter un pliage,
    dans lequel le poinçon (2) présente une tête de poinçonnage (2a) qui entre directement en contact avec le matériau en plaque (S) pour appuyer sur le matériau en plaque (S), et un élément de soutien de poinçon (2b) qui est connecté à l'arrière de la tête de poinçonnage (2a) et soutient la tête de poinçonnage (2a), et
    la tête de poinçonnage (2a) est dotée d'une surface de travail (K) présentant un centre de surface de travail (O) qui correspond à un axe de l'élément de soutien de poinçon (2b), étant constitué d'un arc circulaire non uniforme,
    caractérisé en ce qu'un rayon dans une zone centrale dans la direction de largeur de l'arc circulaire non uniforme est un rayon maximal (r1) et étant défini inférieur à 120 ° en tant qu'angle de pliage et présentant une largeur de travail (ni) étant définie inférieure à 60 ° sur chaque côté depuis le centre de surface de travail (O) du poinçon (2).
  2. L'outil de formation par pliage-presse selon la revendication 1, dans lequel l'arc circulaire non uniforme est un arc circulaire continu ou un arc circulaire discontinu obtenu en combinant au moins deux arcs présentant des rayons différents.
  3. L'outil de formation par pliage-presse selon la revendication 1, dans lequel l'arc circulaire non uniforme inclut une courbe développante.
  4. L'outil de formation par pliage-presse selon la revendication 2, dans lequel l'arc circulaire continu ou l'arc circulaire discontinu inclut un arc circulaire principal (K1) qui présente un rayon correspondant à un diamètre intérieur d'un tube d'acier à fabriquer et présente des largeurs de travail latéralement identiques par rapport au centre de surface de travail (O), et un sous-arc circulaire (K2) qui conduit à une arête de largeur de l'arc circulaire principal (K1) et présente un rayon (r2) inférieur au rayon (r1).
  5. L'outil de formation par pliage-presse selon l'une quelconque des revendications 1 à 3, dans lequel une zone de l'arc circulaire non uniforme, dans laquelle un arc circulaire contribuant essentiellement au pliage est formé, présente une largeur de travail de moins de 0,90 fois un pas d'alimentation du matériau en plaque (S).
  6. L'outil de formation par pliage-presse selon la revendication 4, dans lequel une zone de l'arc circulaire continu ou de l'arc circulaire discontinu, dans laquelle l'arc circulaire principal (K1) est constitué, présente une largeur de travail de moins de 0,90 fois le pas d'alimentation du matériau en plaque(S).
EP15772740.5A 2014-03-31 2015-03-30 Outil de formation par pliage-presse Active EP3127624B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2014072523 2014-03-31
JP2015046163A JP6262166B2 (ja) 2014-03-31 2015-03-09 ベンディングプレス成形用金型
PCT/JP2015/059833 WO2015152107A1 (fr) 2014-03-31 2015-03-30 Matrice pour cintrage-formage sous pression

Publications (3)

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EP3127624A1 EP3127624A1 (fr) 2017-02-08
EP3127624A4 EP3127624A4 (fr) 2017-04-26
EP3127624B1 true EP3127624B1 (fr) 2022-11-30

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EP (1) EP3127624B1 (fr)
JP (1) JP6262166B2 (fr)
KR (1) KR101945091B1 (fr)
CN (1) CN106132577B (fr)
BR (1) BR112016022887B1 (fr)
RU (1) RU2650468C2 (fr)
SA (1) SA516371950B1 (fr)
WO (1) WO2015152107A1 (fr)

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JP6112740B2 (ja) * 2014-03-31 2017-04-12 Ｊｆｅスチール株式会社 ３点曲げプレス成形による鋼管の成形方法および成形装置
KR101642938B1 (ko) * 2016-02-15 2016-07-26 라이텍엔지니어링(주) 조이너
CN107695163B (zh) * 2017-10-10 2023-06-16 上海新闵（东台）重型锻造有限公司 核岛蒸发器封头整体冲压成型装置及冲压成型方法
CN107442730B (zh) * 2017-10-10 2023-05-30 上海新闵（东台）重型锻造有限公司 核电蒸发器封头整体成型冲头
CN107716627A (zh) * 2017-10-26 2018-02-23 天津天重中直科技工程有限公司 一种大型压力折弯系统
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RU2016138627A (ru) 2018-04-02
JP2015199126A (ja) 2015-11-12
CN106132577A (zh) 2016-11-16
JP6262166B2 (ja) 2018-01-17
EP3127624A1 (fr) 2017-02-08
CN106132577B (zh) 2019-01-29
KR101945091B1 (ko) 2019-02-01
SA516371950B1 (ar) 2020-12-30
EP3127624A4 (fr) 2017-04-26
RU2650468C2 (ru) 2018-04-13
RU2016138627A3 (fr) 2018-04-02
WO2015152107A1 (fr) 2015-10-08
BR112016022887B1 (pt) 2021-01-12

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