JP6332171B2 - Raw material thick steel plate and method for producing thick steel plate product using the material thick steel plate - Google Patents

Description

  The present invention relates to a raw steel plate and a method for manufacturing a thick steel plate product using the raw steel plate.

  Thick steel plate products are used in the manufacture of bridges, buildings, shipbuilding, offshore structures, storage tanks, pressure vessels, line pipes and the like. Thus, since the thick steel plate product is applied to various uses, the product width and the product length required for the thick steel plate product are various.

  Therefore, in the manufacture of thick steel plate products, there is a method of creating a plate plan according to the product width and product length of the thick steel plate product and determining the shear position (Patent Document 1).

  Further, there is a rolling method of a material thick steel plate called a different width rolled steel plate having two or more types of widths by applying planar shape control. By this rolling method, it is possible to reduce the material calculation loss that occurs during the combination of product cutting (Known Literature 1).

JP 2004-276034 A

90 pages, 5th edition Steel Handbook Volume 2 Rolling and secondary processing, Japan Iron and Steel Institute, issued on August 31, 2014

  As in the invention described in Patent Document 1, the method of collecting a plurality of thick steel plate products from a large material thick steel plate is excellent in that it can efficiently collect thick steel plate products of various dimensions.

  However, defective products may occur when a thick steel plate product is collected from different width rolled steel plates having two or more types of widths. It is desirable if the occurrence of this defective product can be suppressed.

  The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for producing a thick steel plate product, which can efficiently collect a thick steel plate product from a raw thick steel plate.

  In order to solve the above problems, the present inventors have conducted intensive research. As a result, a surplus area with a certain width is determined in the longitudinal direction of the steel sheet to be distributed to the top part and bottom part of the thick steel sheet, and the product area between the surplus area of the top part and the surplus area of the bottom part A plan for collecting thick steel plate products is created, the thick steel plate is sheared in the width direction of the steel plate, separated into a plate including a wide plate portion and a plate including a narrow plate portion, and based on the plan plan The present inventors have found that the above problems can be solved by shearing each plate and collecting a thick steel plate product, and have completed the present invention. More specifically, the present invention provides the following.

  [1] A wide plate portion having a plate width a, a narrow plate portion having a plate width b (a> b), and the wide plate portion to the width between the wide plate portion and the narrow plate portion. The steel plate product has a transition plate portion that narrows toward the narrow plate portion, and the steel plate product is sampled from the thick steel plate that is sheared into a plurality of thick steel plate products, Distribute to the top part and bottom part of the thick steel sheet, determine the extra length area of a certain width in the longitudinal direction of the steel sheet, and from the product area between the extra length area of the top part and the extra length area of the bottom part Create a plan for collecting thick steel plate products, shear the raw steel plate in the width direction of the steel plate, separate it into a plate containing a wide plate portion and a plate containing a narrow plate portion, and based on the plan plan A method of manufacturing a thick steel plate product, in which each plate is sheared to collect a thick steel plate product.

  [2] A wide plate portion having a plate width of a, a narrow plate portion having a plate width of b (a> b), and the wide plate portion to the width between the wide plate portion and the narrow plate portion. The steel plate product has a transition plate portion that narrows toward the narrow plate portion, and the steel plate product is sampled from the thick steel plate that is sheared into a plurality of thick steel plate products, Distribute to the top part and bottom part of the wide plate part, the extra length region having a constant width in the longitudinal direction of the steel sheet, and the constant width in the longitudinal direction of the steel sheet to distribute to the top part and bottom part of the narrow plate part. A surplus length region of the wide plate portion, a product region between the surplus length region of the top portion and the surplus length region of the bottom portion, and a surplus length region of the top portion of the narrow plate portion and the Create a plan for collecting steel plate products from the product area between the extra length areas of the bottom part, and the extra length area of the bottom part of the wide plate part The steel plate is sheared in the width direction of the steel plate and separated into a plate including a wide plate portion and a plate including a narrow plate portion, and each plate is sheared and a thick steel plate product is collected based on the planing plan. To manufacture thick steel plate products.

  [3] In the steel plate width direction, the separation after creating the planing plan is performed in the surplus length region allocated to the bottom portion of the wide plate portion and in the surplus length region of the top portion of the narrow plate portion. This is the shearing of the thick steel plate. After the shearing, the portion including the transition plate portion is excluded from the production line, and the product region of the wide plate portion and the product region of the narrow plate portion are respectively sheared to collect the thick steel plate product. The method for producing a thick steel plate product according to [2].

  [4] The method for producing a thick steel plate product according to [2] or [3], wherein the product region of the narrow plate portion is sheared at least in a longitudinal direction of the steel plate to collect a thick steel plate product.

  If the thick steel plate material of the present invention is used, even if a wide thick steel plate product is collected, a thick steel plate product with a wide plate width and a thick steel plate product with a narrower plate width than that are obtained from one raw material thick steel plate. It can be collected efficiently.

It is a top view which shows typically the raw material thick steel plate used for the manufacturing method of this invention. It is drawing explaining the manufacturing method of a thick steel plate product, Fig.2 (a) is a top view which shows typically the state by which the surplus length area | region was allocated, FIG.2 (b) is the state in which the planing plan was applied It is a top view which shows typically. FIG. 3 (a) is a plan view schematically showing a state in which an extra length area is allocated, and FIG. 3 (b) is a schematic view showing a state in which a planing plan is applied. FIG.

<Manufacturing method of thick steel plate product>
First, the raw steel plate used in the production method of the present invention will be described with reference to FIG. FIG. 1 is a plan view schematically showing a material thick steel plate.

  As shown in FIG. 1, the material thick steel plate 1 of the present invention includes a wide plate portion 10, a narrow plate portion 11, and a transition plate portion 12. Although the thickness of the raw material thick steel plate 1 is not specifically limited, The thickness of a general thick steel plate is 6-50 mm.

  The wide plate portion 10 is a portion having a plate width a, and is a portion for collecting a thick steel plate product having a wide plate width. Further, if the thick steel plate is sheared in the longitudinal direction of the steel plate, even a thick steel plate product having a narrow plate width can be collected from here. In addition, although a is suitably determined according to the plate | board width of a desired thick steel plate product, in manufacture of a normal thick steel plate product, a exists in the range of 1500-5500mm.

  The narrow plate portion 11 is a portion where the plate width is b (a> b). From here, it is not possible to collect a thick steel plate product with a wide plate width, but a thick plate product with a plate width within b is collected. can do. Note that b is appropriately determined in accordance with the desired plate width of the thick steel plate product in the same manner as a, but b is usually in the range of 1500 to 5500 mm.

  The transition plate portion 12 exists between the wide plate portion 10 and the narrow plate portion 11 and has a shape in which the plate width becomes narrower from the wide plate portion 10 toward the narrow plate portion 11. Although this transition board part 12 can also be included in the area | region (it may be called a product area | region) which extract | collects the thick steel plate product in the raw material thick steel plate 1, as mentioned later, in a predetermined case, from this transition board part 12 Preferably does not collect thick steel plate products.

  In addition, what is necessary is just to manufacture the said raw material steel plate by a general method.

  Next, a method for producing a thick steel plate product using the raw steel plate 1 will be described with reference to FIG. FIG. 2A is a plan view schematically showing a state in which the extra length area is allocated, and FIG. 2B is a plan view schematically showing a state in which the planing plan is applied.

First, the planar shape (width and length) of the material thick steel plate is measured with a planar shape meter or the like.
From the measured planar shape, the effective length, that is, the width of the material thick steel plate 1 is the product width (when collecting multiple products in the width report, the total product width aligned in the width direction) + margin (normally Is about 10 mm) or more. Next, based on the effective length and the product dimension length, a surplus length region to be distributed to the top portion and the bottom portion is determined. In FIG. 2A, the surplus length region is a shaded portion, and the width of the surplus length region in the longitudinal direction of the steel plate may be the same or different between the bottom portion and the top portion.

Next, a planing plan for collecting thick steel plate products from a product region between the surplus length region of the top portion and the surplus length region of the bottom portion is created. For example, it is planned to collect steel plate products _X 1 to X ₆ shown in FIG. 2 (b). In FIG. 2B, the margin is omitted. Further, a portion obtained by removing the surplus length area indicated by shading from the area within the effective length range becomes the product area. The extra length region is provided to prevent the product region from being sheared even when the shearing position is slightly shifted.

  Next, the material thick steel plate 1 is sheared in the width direction of the steel plate to be separated into a plate including the wide plate portion 10 and a plate including the narrow plate portion 11, and each plate is sheared and thick steel plate based on the above plate plan. Collect the product. For example, the plate is sheared at the C shear position shown in FIG. 2B to be separated into a plate including the wide plate portion 10 and a plate including the narrow plate portion 11 and the transition plate 12. Thereafter, the shear position for obtaining the thick steel plate product is confirmed, each plate is sheared based on the planing plan, and the thick steel plate product is collected. At this time, the plate including the wide plate portion 10 can be sheared on the line using an endorser or the like. On the other hand, when the plate including the transition plate portion 12 and the narrow plate portion 11 is subjected to shearing in the steel plate longitudinal direction at the center of the steel plate width direction with the side shear, and then the shearing in the steel plate width direction is attempted with the endsha, the above plate is Since the guide roll in the transporting facility moves according to the product width, a portion corresponding to the transition plate 12 of the plate collides with the guide roll. Therefore, since the plate cannot be sheared by the shear in the above case, the plate must be retreated from the equipment, and the retreated plate is cut with gas to collect a thick steel plate product.

  Next, the effect of the present invention will be described. According to the manufacturing method of FIG. 2, the provision of the extra length regions in the top portion and the bottom portion can suppress the occurrence of defective steel plate products collected from the tip and tail ends.

  It is preferable to collect a thick steel plate product from the different width steel plate (the material steel plate) as follows.

  The preferable aspect of the manufacturing method of the thick steel plate product of this invention is demonstrated using FIG. FIG. 3A is a plan view schematically showing a state in which the extra length area is allocated, and FIG. 3B is a plan view schematically showing a state in which the planing plan is applied.

  First, distribute to the top part and bottom part of the wide plate part 10, distribute the extra length area of a certain width in the longitudinal direction of the steel sheet, and distribute to the top part and bottom part of the narrow plate part 11 in the longitudinal direction of the steel sheet. An extra length area having a certain width is determined.

  The surplus length region of the wide plate portion 10 is a shaded portion shown in FIG. 3A, and is distributed to the tip and tail ends of the region in the range of the effective length of the wide plate portion 10, and in the longitudinal direction of the steel plate. It is an area with a certain width. Here, the effective length of the wide plate portion 10 means that the width of the material thick steel plate 1 is the product width (when a plurality of products are collected in the width direction, the total width of the products arranged in the width direction is the total width. In the plate part 10, it is the length of the area | region which is more than a) + margin (usually about 10 mm).

  The extra length region of the narrow plate portion 11 is the dot portion shown in FIG. 3A, and is distributed to the tip and tail ends of the region in the range of the effective length of the narrow plate portion 11, and the longitudinal direction of the steel plate This is an area having a certain width. Here, the effective length of the narrow plate portion 11 is the width of the material thick steel plate 1 is the product width (in the case of collecting a plurality of products arranged in the width direction, the total of the product widths arranged in the width direction, In the narrow plate part 11, it is the length of the area | region which is more than b) + margin (usually about 10 mm).

Next, a product region between the surplus length region of the top portion and the bottom portion of the wide plate portion 10 and a product region between the surplus length region of the top portion and the bottom portion of the narrow plate portion 11. Create a plan for collecting steel plate products from the area. For example, the plan is to collect thick steel plate products Y ₁ to Y ₆ shown in FIG. In FIG. 3B, the margin is omitted. In addition, the portion of the wide plate portion 10 excluding the surplus length region indicated by shading from the region in the effective length range becomes the product region of the wide plate portion 10, and falls within the effective length range of the narrow plate portion 11. A portion excluding the extra length region indicated by dots from a certain region becomes a product region of the narrow plate portion 11.

  Next, the raw thick steel plate 1 is sheared in the width direction of the steel plate in the extra length region of the bottom portion of the wide plate portion 10 to be separated into a plate including the wide plate portion 10 and a plate including the narrow plate portion 11. After this separation, confirm the shear to obtain the thick steel plate product from each plate, shear each plate with Endsha or cut each plate with gas based on the above plate plan. Collect thick steel plate products.

  Although it is preferable to manufacture a thick steel plate product as described above, a more preferable manufacturing method is obtained by performing the following steps after the separation.

The separation is defined as shearing of the material thick steel plate 1 in the steel plate width direction in the extra length region allocated to the bottom portion of the wide plate portion 10 and in the extra length region of the top portion of the narrow plate portion 11. For example, exhibited a respective shearing positions _{C 1} shear position, in FIG. 3 (b) as a _{C 2} shear position. Incidentally, as described later, C ₁ shear position is preferably to the vicinity of the boundary between the wide plate portion 10 and the transition wall 12, the steel plate longitudinal direction of the top portion excess length region of C ₂ shear position the narrow plate portion 11 It is preferable to be in the vicinity of the center.

Then, to eliminate the portion including the transition plate from the manufacturing line C ₁ shear position, after shearing in the C ₂ shear position.

  Next, the shear position for obtaining the thick steel plate product is confirmed, and the plate including the wide plate portion 10 and the plate including the narrow plate portion 11 of the material thick steel plate are respectively sheared based on the above-described planing plan to obtain the thick steel plate product. Collect. For example, a plate including the wide plate portion 10 may be sheared by an endsha. In the planing plan shown in FIG. 3B, it is necessary to shear in the longitudinal direction of the steel plate in the product region of the narrow plate portion 11. In this case, the shearing in the longitudinal direction of the steel sheet may be performed with a side shear, and the shearing in the width direction of the steel sheet may be performed with an end shear.

  Then, the effect show | played by said preferable manufacturing method is demonstrated.

  In this manufacturing method, unlike the method shown in FIG. 2, an extra length region is allocated to each of the wide plate portion 10 and the narrow plate portion 11 to set a product region. In the case of the method shown in FIG. 2, the size of the wide plate portion 10, the size of the narrow plate portion 11, and the size of the transition plate portion 12 are estimated by a planar shape meter or the like, and the plate including the wide plate portion 10 and the width Although the shear position to be separated into the plate including the narrow plate portion 11 is determined, it cannot be said that the accuracy of this estimation is high. If the estimation is a little wrong and the size of the wide plate portion 10 is larger than the actual size, it will shear in the product region, and the steel plate product taken from the tail end side of the product region of the wide plate portion 10 Will be defective. In this manufacturing method, after shearing in the extra length area | region of the bottom side of the wide board part 10, the product area | region of the wide board part 10 is sheared, and a thick steel plate product can be extract | collected. Therefore, even if the size is estimated incorrectly, there is a low possibility of shearing the product region of the wide plate portion 10 in the shear for separating the plate including the wide plate portion 10 and the plate including the narrow plate portion 11. Become. Thus, according to this manufacturing method, generation | occurrence | production of the inferior goods of a thick steel plate product can be suppressed.

Further, separation of the plate including the wide plate portion 10 and the plate including the narrow plate portion 11 is performed at two locations (C ₁ shear position, C ₁₎ of the extra length region of the wide plate portion 10 and the extra length region of the narrow plate portion 11. ₍₂ shearing position) is performed by removing the transition plate portion 12 from the line, and the plate including the narrow plate portion 11 is sheared on the line to obtain a thick steel plate product. The method of shearing on the line by the endorser or the like can be performed in a shorter time than the method of removing the plate from the line and cutting it with gas. For this reason, according to this method, the production efficiency of a thick steel plate product further increases. In particular, when a plate including the narrow plate portion 11 is sheared in the longitudinal direction of the steel plate to collect a thick steel plate product, the plate is separated into a plate including the wide plate portion 10 and a plate including the narrow plate portion 11 respectively. Since it is necessary to collect steel plate products from the line, each of them can be transported on the line, particularly when a thick steel plate product is collected by cutting a plate including the narrow plate portion 11 in the longitudinal direction of the steel plate. It is effective.

From the viewpoint of suppressing the defective occurrence of thick steel plate, preferably as apart C ₁ shear position, the C ₂ shear position from the product region. However, C ₂ For shear position, setting near the boundary of the narrow plate portion 11 and the transition wall 12, enters the portion of the transition plate 12 to the plate containing the narrow plate portion 11, on the above line The possibility that the effect of obtaining a thick steel plate product is not achieved increases. Thus, C ₁ shear position, as described above, it is preferable to set in the vicinity of the boundary between the wide plate portion 10 and the transition plate 12, C ₂ shear position, as described above, be a steel plate longitudinal direction near the center Is preferred.

1 Thick steel plate 10 Wide plate portion 11 Narrow plate portion 12 Transition plate portion

Claims (3)

A wide plate portion having a plate width a, a narrow plate portion having a plate width b (a> b), and the narrow plate portion from the wide plate portion to the narrow plate portion. A steel plate product that has a transition plate portion that narrows toward the plate and that is sheared to obtain a plurality of steel plate products from a thick steel plate product,
Distribute to the top and bottom portions of the wide plate portion, a surplus length region having a constant width in the longitudinal direction of the steel plate, and distribute to the top portion and bottom portion of the narrow plate portion, to be constant in the longitudinal direction of the steel plate. Determine the extra width area,
The product area between the extra length area of the top part and the extra part of the bottom part of the wide plate part, and between the extra length area of the top part and the extra part of the bottom part of the narrow plate part Create a plan to collect steel plate products from the product area of
Shearing the material thick steel plate in the width direction of the steel plate in the extra length region of the bottom portion of the wide plate portion, separating it into a plate containing the wide plate portion and a plate containing the narrow plate portion, and based on the planing plan, A method of manufacturing a thick steel plate product in which each plate is sheared to collect a thick steel plate product. The separation after creating the planing plan is a thick steel plate in the steel plate width direction in the extra length region allocated to the bottom portion of the wide plate portion and in the extra length region of the top portion of the narrow plate portion. The shear of
Excluding the portion including the transition plate after the shearing from the production line,
The method for producing a thick steel plate product according to claim 1 , wherein the product region of the wide plate portion and the product region of the narrow plate portion are respectively sheared to collect the thick steel plate product. The manufacturing method of the thick steel plate product of Claim 1 or 2 which shears the product area | region of the said narrow board part at least to the longitudinal direction of a steel plate, and extract | collects a thick steel plate product.

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