JP2010179361A - Roll for forming electric-resistance-welded steel pipe and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roll for forming an electric-resistance-welded steel pipe, capable of reducing cost and shortening delivery times by eliminating the necessity of piece-to-piece forging even in manufacturing an extreme large-diameter roll exceeding standard specifications, and facilitating maintenance of raw materials. <P>SOLUTION: The roll for forming electric resistance-welded plate pipes is designed such that a plurality of arch-like roll blocks 6 each having a predetermined width and forming a roll caliber surface 6a are attached on the outer circumferential portion of a disc-like roll block attaching core metal 5 having a diameter not more than a predetermined length and a predetermined thickness in the diameter direction of the roll block attaching core metal 5 in a manner that the roll blocks 6 are continuously provided, and a roll 4 has a predetermined large diameter by a combination between the roll block attaching core metal 5 and the plurality of roll blocks 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ERW steel pipe forming roll and a method for manufacturing the same, and in particular, an ERW steel pipe forming roll capable of manufacturing an oversized roll without requiring individual forging and manufacturing the roll. It is about the law.

  The ERW steel pipe is manufactured by continuously forming a steel strip into a tubular shape using a plurality of types of rolls, and then performing electrical resistance welding on the butt portion. Among these plural types of rolls, there is a disk-shaped roll having a predetermined thickness. Of the rolls having such a shape, a standard roll having a diameter of about 900 mmφ or less is prepared by stocking a forged round bar material in advance and cut out from the round bar material. It is common.

By the way, an extra large diameter roll having a diameter of about 900 mmφ or more is used for manufacturing a large diameter electric resistance steel pipe used for a plant or the like. 6A and 6B show such an extra large diameter roll. The figure (a) is a front view, The figure (b) is the VV sectional view taken on the line in figure (a). In (a) and (b) of the figure, the roll 1 has a diameter D of about 1020 mmφ, thicknesses of T _{1 of} about 150 mm, T ₂ of about 210 mm, and an arc radius R of the roll surface 1a in the cross section of FIG. Is formed as an extra large diameter roll of about 108 mm. A shaft mounting hole 2 is opened in the center, and a plurality of tap holes 3. ... is formed. When manufacturing the oversized roll 1 as shown in the figure, it is difficult to use the one that has been previously forged in the state of a round bar material. For example, if the diameter exceeds 1000 mmφ, the heat treatment furnace for forging becomes special. For this reason, so-called individual forging, in which one piece of material whose diameter exceeds 900 mmφ is forged, is performed.

As a conventional technique related to a roll for forming an ERW steel pipe, for example, a method for manufacturing an ultra-high-strength ERW steel pipe is known. This prior art is disclosed in [0013] to [0016] in the publication in which the prior art is disclosed. After ultra-high strength steel is hot-rolled and cold-rolled and then heated and soaked in a continuous heat treatment facility, A steel plate of 2.1 mm thickness that had been hardened and had a predetermined ultra-high tension was used as a material plate for the production of ERW steel pipes. The raw steel plate is cut into a slit coil having a width of 110 mm, and then supplied to an ERW steel pipe production line as shown in FIG. 4, and is subjected to curve forming by a breakdown roll group via a guide roll and a presser roll. Then, it was sent to a work coil and a welding roll through a fin pass stand to obtain an ERW steel pipe. After that, it is described that the product has been subjected to electro-welding to obtain a product having an outer diameter of 34 mm (for example, see Patent Document 1).
Japanese Patent Application Laid-Open No. 5-57340.

  In the prior art for manufacturing the extra-large diameter roll described in FIGS. 6A and 6B, since the individual forging of the material is required, from the stock of the round bar material that has been forged. Compared to standard rolls that can be manufactured, the delivery time is longer and the cost is higher, and the material is also oversized, so the maintainability is also deteriorated.

  Moreover, in the prior art described in Patent Document 1, it is only described that the raw steel plate is bent using a plurality of types of rolls, and there is no description about manufacturing the roll itself.

Therefore, even when manufacturing rolls with extra-large diameters exceeding the standard specification, it is possible to reduce costs by eliminating the need for single-piece forging, shorten delivery times, and to solve problems to facilitate material maintenance. The present invention aims to solve this problem.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is a disk-shaped roll block mounting core having a predetermined thickness and a roll caliber surface having a diameter of a predetermined length or less. A plurality of arc-shaped roll blocks having a required width in the radial direction of the roll block mounting core are attached to the outer periphery of the gold in a manner in which the roll blocks are connected to each other, the roll block mounting core and the Provided is an electric resistance welded steel pipe forming roll having a required large diameter by combining with a plurality of roll blocks.

  According to this configuration, when an extra large diameter roll having a diameter of, for example, 900 mmφ or more is realized, the roll block mounting core metal having a diameter of a predetermined length or less, that is, a standard specification or less, and a plurality of roll caliber surfaces are formed. By combining with a single bow-shaped roll block, the roll block mounting core and the plurality of bow-shaped roll blocks are both cut out from a material that does not require individual forging. It becomes possible. In addition, maintenance is facilitated by making each material a size that does not require individual forging.

  According to a second aspect of the present invention, in the first aspect of the present invention, the mounting portions of the roll blocks with respect to the roll block mounting core are cut away from each other to form stepped portions, and the stepped portions are bolts. Provided is a roll for forming an ERW steel pipe having a stepped structure fastened by using an iron.

  According to this configuration, each roll block is firmly attached to the roll block mounting core by attaching the roll block mounting core to each roll block in a stepped structure. However, a roll forming function substantially equivalent to that of a roll having a single member structure can be obtained.

  A third aspect of the present invention provides the roll for forming an electric resistance steel pipe according to the first or second aspect of the present invention, wherein the number of the roll blocks is six.

  According to this configuration, it is possible to obtain the ease of mounting each roll block to the roll block mounting core and to suppress the high manufacturing cost.

  The invention according to claim 4 is an arcuate shape in which a disk-shaped roll block mounting core bar having a required thickness with a diameter equal to or less than a predetermined length is cut out from a round bar steel material, and has a required width and forms a roll caliber surface. The roll block is cut out from a block-shaped steel material that has been previously forged, and a plurality of the roll blocks are attached to the outer periphery of the roll block mounting core in a manner in which the roll blocks are connected to each other, the roll block Provided is a method for manufacturing a roll for forming an ERW steel pipe which is a roll having a required large diameter by a combination of a mounting core and the plurality of roll blocks.

  According to this configuration, when an extra large roll having a diameter of, for example, 900 mmφ or more is manufactured, the roll block mounting core metal having a diameter of a predetermined length or less, that is, a standard standard or less, and a plurality of roll caliber surfaces are formed. The roll block mounting core is formed by cutting from a round bar steel material that has been forged in advance and is in stock, and has a plurality of bow-shaped roll blocks. The bow-shaped roll block can be formed by cutting from a block-shaped steel material having a size for which forging has been completed in advance. In addition, since the round bar steel material and the block steel material are sized so as not to require individual forging, the maintenance can be facilitated.

  According to a fifth aspect of the present invention, there is provided a method for producing a roll for forming an electric-welded steel pipe according to the fourth aspect of the present invention, wherein the round bar steel material can be stocked as a standard product.

  According to this configuration, when manufacturing an extra large diameter roll, the roll block mounting core is a standard configuration by combining the roll block mounting core with a plurality of bow-shaped roll blocks. It becomes possible to make it the magnitude | size below a specification grade, and it becomes possible to stock the round bar steel material for cutting out this as a standard product which completed forging.

  According to a sixth aspect of the present invention, in the invention of the fourth or fifth aspect, the arc-shaped roll block is produced by cutting out one piece from one square block-shaped steel material. I will provide a.

  According to this configuration, each arc-shaped roll block can be formed by cutting out from a square block steel material that has been forged and stocked in advance.

  The invention according to claim 7 is the invention according to claim 4 or 5, wherein the arc-shaped roll block is formed by cutting out a plurality of zigzags from a rectangular block-shaped steel material in a longitudinal direction of the block-shaped steel material. A method for producing a roll for forming an electric resistance steel pipe is provided.

  According to this configuration, it is possible to minimize the waste of steel material when cutting out by forming a plurality of arc-shaped roll blocks in a zigzag shape from a square block-shaped steel material that has been forged in advance. Become.

  The invention of the roll for forming an ERW steel pipe according to claim 1, when realizing an extra large diameter roll exceeding the standard, a plurality of roll block mounting cores having a diameter equal to or less than a predetermined length and a roll caliber surface. By combining with a single bow-shaped roll block, the roll block mounting core and the plurality of bow-shaped roll blocks are both formed by cutting out from a material that does not require individual forging. Therefore, there is an advantage that the cost can be reduced, the delivery time can be shortened, and the maintenance of the material can be facilitated.

  In addition to the effect of the invention according to claim 1, the invention of the roll for forming an ERW steel pipe according to claim 2 can further firmly attach each roll block to the roll block mounting core, This roll has the advantage that a roll forming function substantially equivalent to that of a roll having a single member structure can be obtained.

  The invention of the roll for forming an ERW steel pipe according to claim 3 is advantageous in that it is easy to attach each roll block to the roll block mounting core and the manufacturing cost can be suppressed.

  The invention of the method for producing a roll for forming an ERW steel pipe according to claim 4 includes the steps of producing a roll having an oversized diameter exceeding a standard specification, and a roll block mounting core having a diameter of a predetermined length or less, and a roll caliber surface. The roll block mounting core is formed by cutting a round bar steel material having a size that does not require individual forging, by combining with a plurality of bow-shaped roll blocks to be formed. The roll block can be formed by cutting from a block-shaped steel material that has been forged in advance, which can reduce costs, reduce delivery time, and facilitate maintenance of each steel material. There is.

  In the invention of the method for producing a roll for forming an ERW steel pipe according to claim 5, since the roll block mounting core is less than a standard size, the round bar steel for cutting out the stock is a forged stock. There is an advantage that it can be made as a product and can contribute more effectively to cost reduction and shortened delivery time.

  In the invention of the method for manufacturing a roll for forming an ERW steel pipe according to claim 6, each arc-shaped roll block may be formed by cutting out from a square block steel material that has been forged and stocked in advance. This is advantageous in that it can contribute to cost reduction.

  In addition to the effect of the invention according to claim 4 or 5, the invention of the method for producing an ERW steel pipe forming roll according to claim 7 further minimizes steel material waste when cutting out a plurality of arc-shaped roll blocks. There is an advantage that it can be suppressed to the limit and can further contribute to cost reduction.

  In order to achieve the purpose of reducing the cost and shortening the delivery time by eliminating the need for individual forging even when manufacturing extra large diameter rolls exceeding the standard, A bow-shaped roll block having a required width in the radial direction of the roll block mounting core bar and forming a roll caliber surface on the outer peripheral portion of the disk-shaped roll block mounting core bar having a predetermined diameter and a predetermined thickness. These roll blocks are mounted in such a manner that the roll blocks are connected to each other, and a roll having a required large diameter is obtained by combining the roll block mounting core and the plurality of roll blocks.

  Hereinafter, a roll for forming an ERW steel pipe according to an embodiment of the present invention and a manufacturing method thereof will be described in detail with reference to the drawings. FIG. 1 is a view showing a roll for forming an electric resistance steel pipe, (a) is a front view, (b) is a cross-sectional view taken along line XX in FIG. (A), and FIG. 2 is a roll block mounting core. (A) is a front view, (b) is a cross-sectional view taken along line YY in FIG. (A), FIG. 3 is a view showing a roll block, (a) is a front view, ( b) is a sectional view taken along line ZZ in FIG. 1 to 3 that are the same as or equivalent to those in FIG. 6 are denoted by the same reference numerals as those in FIG.

First, the configuration of the ERW steel pipe forming roll according to the present embodiment will be described together with specific numerical examples. 1 (a) and 1 (b), a roll 4 for forming an ERW steel pipe has a disc-shaped roll block mounting core 5 having a diameter of about the standard or less and an outer peripheral portion of the roll block mounting core 5 forming roll block 6 of the six arcuate provided continuously in an annular, ... by the combination structure of the about 1020mmφ diameter D, thickness _{T 1} is 150 mm, _{T 2} is 210mm approximately, by each roll block 6 The arc radius R of the roll caliber surface 6a thus formed is formed as an extra large diameter roll of about 108 mm. These external dimensions and external shapes are almost the same as those of the single-member roll shown in FIG.

As shown in FIGS. 2 (a) and 2 (b), the roll block mounting core 5 is formed to have a diameter Da of about 850 mmφ, which is less than or equal to a standard, and the roll blocks 6,. Therefore, the step portion 5a of the width and about both 75mm thickness with Kakare missing cut half of the total thickness T ₁ at 75mm about the width over the entire circumference. In order to attach six bow-shaped roll blocks 6,... To the step portion 5a using two bolts per piece, a total of twelve bolt holes 5b are formed at equal intervals. ing.

Each of the arch-shaped roll blocks 6 has a roll caliber surface 6a having an arc radius R of about 108 mm as shown in the cross-section of FIG. 3B at the portion of the arch-shaped outer circular arc surface shown in FIG. Is formed. Further, a step portion 6b corresponding to the step portion 5a of the roll block mounting core 5 is formed at the portion of the arcuate inner circular arc surface shown in FIG. Both the width and thickness of the step 6b are about 75 mm. Two bolt holes 6c are formed in the step 6b. Roll block 6該弓shape, the thickness T ₁ is the same as the thickness T ₁ of the said roll block mounting metal core 5, the width of the roll block mounting metal core width Db to the radial direction corresponding 5 (stepped portion 6b Is about 85 mm.

  As shown in FIG. 1B, the roll block mounting mandrel 5 and each roll block 6 configured as described above have bolts 7, spring washers 8, A roll forming function 11 that is firmly assembled using a plain washer 9 and a hexagon nut 10 is integrally assembled, and a roll forming function substantially equivalent to that of a roll having a single member configuration can be obtained as a roll 4 having a combined configuration. It is like that. The diameter D of the roll 4 due to the combined configuration is Da + 2Db due to the diameter Da (850 mmφ) of the roll block mounting core 5 and the width Db (85 mm) corresponding to the radial direction of the roll block mounting core 5 in the roll block 6. As described above, it is 1020 mmφ.

  Next, the manufacturing method and operation of the roll for forming an ERW steel pipe configured as described above will be described with reference to FIGS. FIG. 4 is a diagram showing an example of material removal of a roll block, (a) is a plan view of a square block steel, (b) is a side view of FIG. (A), and FIG. It is a figure which shows an example, (a) is a top view of a square block-shaped steel material, (b) is a side view of figure (a).

  The roll block mounting core 5 having a diameter less than or equal to the standard is formed by cutting from a round bar steel material (not shown) that has been previously forged and stocked as a standard product, and subjected to necessary cutting and drilling. As shown in FIGS. 4A and 4B, each of the bow-shaped roll blocks 6 includes, as an example, one square block-shaped steel material 12 to 1 that has been forged and stocked in advance. A piece is cut out and formed by performing required cutting and drilling. Each dimension of one rectangular block-shaped steel material 12 is about 510 mm in length and about 202 mm × 150 mm in length and width.

  In addition, as shown in FIGS. 5A and 5B, the arch-shaped roll block 6 is, as another example, a rectangular block-shaped steel material 13 that has been forged and stocked in advance. Then, a plurality of zigzags are cut out in the longitudinal direction, and each of them is formed by performing necessary cutting and drilling. Each dimension of the rectangular block-shaped steel material 13 is about 1466 mm in length and about 202 mm × 150 mm in length and width. In the example of FIG. 5, three roll blocks 6,... Are cut in a zigzag shape. Has been issued. As described above, when a plurality of arc-shaped roll blocks 6,... Are cut out from the rectangular block-shaped steel material 13 in a zigzag shape, it is possible to minimize the steel material waste when cutting out.

  The roll block 6 is connected to the outer periphery of the roll block mounting core 5 by the roll block mounting core 5 and the bow-shaped roll block 6 having a diameter of about the standard or less. In the embodiment, the six roll blocks 6,... Are firmly attached to each other by the step joint structure 11 to form a roll 4 for forming a large diameter electric resistance steel pipe having a diameter of about 1020 mmφ.

  In addition, about the six roll blocks 6, ... which form the roll caliber surface 6a, the forging process is indispensable, but about the roll block mounting core 5 arranged inside the six roll blocks 6, ... The forging process is not necessarily required. When the forging process for the roll block mounting core 5 is omitted, further cost reduction can be achieved.

As described above, in the roll for forming an ERW steel pipe and the manufacturing method thereof according to the present embodiment, when manufacturing an extra large diameter roll 4 exceeding the standard, the roll block mounting core bar having a diameter of a predetermined length or less. 5 and six bow-shaped roll blocks 6 forming a roll caliber surface, the roll block mounting core 5 is made of a round steel bar having a size that does not require individual forging. The six arch-shaped roll blocks 6,... Can be cut out and formed from a block-shaped steel material that has been forged in advance, thereby reducing costs and shortening delivery time. Maintenance of each steel material can be facilitated.

  Since the attachment portion between the roll block mounting core 5 and each roll block 6 is the step-joint structure 11, each roll block 6 can be firmly attached to the roll block mounting core 5 and the combined structure As the roll 4, a roll forming function substantially equivalent to that of a roll having a single member structure can be obtained.

  A plurality of arch-shaped roll blocks 6,... Forming the roll caliber surface 6a are cut out from the rectangular block-shaped steel material 13 in a zigzag shape in the longitudinal direction thereof, thereby minimizing the waste of the steel material. Can contribute to further cost reduction.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

  The present invention can also be applied to manufacturing and sales activities for only the roll blocks that constitute the present invention.

It is a figure which shows the roll for ERW steel pipe shaping | molding which concerns on the Example of this invention, (a) is a front view, (b) is sectional drawing which follows the XX line in figure (a). It is a figure which shows the roll block attachment metal core in FIG. 1, (a) is a front view, (b) is sectional drawing which follows the YY line in FIG. (A). It is a figure which shows the roll block in FIG. 1, (a) is a front view, (b) is sectional drawing which follows the ZZ line in FIG. (A). It is a figure which shows an example of the material removal of the roll block in the manufacturing method of the roll for ERW steel pipe forming which concerns on the Example of this invention, (a) is a top view of a square block-shaped steel material, (b) is a figure (a). Side view. It is a figure which shows the other example of roll block material removal in the manufacturing method of the roll for ERW steel pipe shaping | molding which concerns on the Example of this invention, (a) is a top view of square block-shaped steel materials, (b) is a figure ( The side view of a). It is a figure which shows the roll of the conventional extra-large diameter, (a) is a front view, (b) is sectional drawing which follows the VV line in figure (a).

1 roll (roll with a single component)
2 Shaft mounting hole 3 Tap hole 4 Roll (Combination roll)
5 Roll block mounting core 6 Roll block 6a Roll caliber surface 7 Bolt 8 Spring washer 9 Plain washer 10 Hex nut 11 Stepped structure 12 Square block steel 13 Square block steel

Claims (7)

  A bow-shaped roll block having a required width in the radial direction of the roll block mounting core bar and forming a roll caliber surface on the outer peripheral portion of the disk-shaped roll block mounting core bar having a predetermined diameter and a predetermined thickness. The roll blocks are attached in such a manner that the roll blocks are connected to each other, and a roll having a required large diameter is obtained by combining the roll block mounting core and the plurality of roll blocks. Roll for forming sewn steel pipes.   The mounting portion of each roll block with respect to the roll block mounting core has a stepped structure in which the opposite portions are cut out to form stepped portions, and the stepped portions are fastened with bolts. A roll for forming an electric resistance steel pipe according to claim 1.   3. The roll for forming an electric resistance welded steel pipe according to claim 1, wherein the number of the roll blocks is six.   A disk-shaped roll block mounting core having a required diameter with a diameter equal to or less than a predetermined length is cut out from a round bar steel material, and a bow-shaped roll block having a required width and forming a roll caliber surface has been forged in advance. It is formed by cutting out from a block-shaped steel material, and a plurality of the roll blocks are attached to the outer periphery of the roll block mounting core in a form in which the roll blocks are connected to each other, the roll block mounting core and the plurality of the cores A method for producing a roll for forming an ERW steel pipe, wherein the roll has a required large diameter by being combined with a roll block.   The said round bar steel material can be stocked as a standard product, The manufacturing method of the roll for ERW steel pipe forming of Claim 4 characterized by the above-mentioned.   6. The method for manufacturing a roll for forming an ERW steel pipe according to claim 4, wherein the arch-shaped roll block is formed by cutting one piece from one square block-shaped steel material.   6. A roll for forming an electric resistance welded steel pipe according to claim 4 or 5, wherein the bow-shaped roll block is formed by cutting a plurality of zigzags from a rectangular block-shaped steel material in a longitudinal direction of the block-shaped steel material. Manufacturing method.

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