JP4779596B2 - Bending method of steel of bead sheet material to install rubber sonar dome of ship. - Google Patents

Description

This invention relates to a bending method of the steel bead sheeting attaching the rubber sonar dome of a ship, more particularly large, vessels bending with cutting a plate-shaped steel material thickness into a predetermined shape The present invention relates to a method of bending a steel material of a bead sheet material to which a rubber sonar dome is attached .

  Conventionally, as shown in FIG. 9, a bead seat 3 for attaching a rubber sonar dome 2 on the bow side of an observation ship 1 or the like is composed of a linear part and a curved part, and the curved part has a radius of curvature R. Since it is large and the wall thickness is about 100 mm, it is generally manufactured by casting (see, for example, Patent Document 1). In FIG. 10, 5 is a bead clamp, and 6 is a fairing plate.

However, when the bead sheet 3 is manufactured by casting, there are the following problems.
(a). Model cost is required because a model for casting is required.
(b) Since minute defects are likely to be mixed in the casting, penetration inspection and X-ray inspection are necessary, and inspection costs are incurred.
(c). When a large number of minute defects that are difficult to find by X-ray inspection occur, there is a process for repairing them, which takes a lot of time and effort.
JP-A-8-327726

Vessels The present invention according focuses on conventional problems, without considering the model cost and repair costs, yet can be manufactured product at a low cost with high quality without penetration probing test or X-ray inspection It is an object of the present invention to provide a method for bending a steel material of a bead sheet material to which a rubber sonar dome is attached .

In order to achieve the above object, the present invention has previously developed a three-dimensional CAD diagram of a plate-shaped steel material to be curved into a plan view, and set a cutting allowance for forming a schematic shape of the steel material from this development view. After that, after determining the shape before bending , based on the data of the three-dimensional CAD diagram of the shape before bending determined in this way , after cutting out the machining allowance from the steel with a machine tool, In order to maintain the curved surface shape after bending, a constraining rib is attached, and then the final processing is performed by fusing around the steel material.

  Here, the plate-shaped steel material is a bead sheet material for mounting a rubber sonar dome of a ship, and the plate-shaped steel material is a steel plate having a thickness of 100 mm to 150 mm.

  In this way, by processing the bead sheet material from a conventional casting product to a steel product, it is possible to achieve high quality without considering model costs or repair costs, and without performing penetration inspection or X-ray inspection. The product can be manufactured at low cost.

This invention, in advance as described above, after expanding the three-dimensional cad diagram of the plate-shaped steel material to be curved surface processing in a plan view, after setting the cutting allowance to form the schematic shape of the steel material from this development view, After determining the shape before bending, based on the 3D CAD data of the shape before bending determined in this way , the machining allowance is cut out from the steel with a machine tool and the rough shape is processed. Bending into a shape, and after attaching a restraining rib to maintain the curved shape after bending, the area around the steel material is melted and the final processing is performed, so the following excellent effects are achieved. is there.
(1) Since a casting model is not required, it is not necessary to take into account the cost of the model and the repair cost when a defect occurs.
(2) Penetration exploration inspection and X-ray inspection such as micro defects of products are not necessary, and inspection costs can be reduced.
(3) Higher quality and higher productivity than cast products, and can be manufactured at low cost.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same components as those in the conventional example are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 1 shows a partially enlarged cross-sectional view of a corner portion mounting structure of a bead sheet 3 on the bow side of a hull 1. In the embodiment of the present invention, a bead sheet 3 at a corner R portion is made of a steel material having a thickness of 100 mm to 150 mm. Made by bending.

As shown in FIGS. 2 to 5, the bead sheet 3 in the corner R portion is manufactured in advance as a three-dimensional CAD diagram S (three-dimensional computer aided design) of a plate-like steel material W to be curved as shown in FIG. Figure S) developed in plan view Sa as shown in FIG. 3, it determines the shape before bending to set the cash K scraping to form a general shape of the steel W from the development view Sa.

Next, such three-dimensional CAD data ( data of a three-dimensional computer-aided design drawing ) is input to a control device (computer) into an NC machine tool, and the steel material W is processed by the NC machine tool or the like based on the three-dimensional CAD data. Then, the machining allowance K is cut out and processed into an approximate product shape.

  And after processing into a rough product shape, the steel material W is bent into a curved surface shape as shown in FIG. 4, and a restraining rib G is attached as shown in FIG. As shown in FIGS. 6 to 7, the bead sheet 3 made of the steel material W is manufactured by fusing the periphery of the steel material W and performing final processing.

  In the trial production of this embodiment, when manufacturing a bead sheet 3 having a length of 1500 mm and a thickness of 75 mm, a steel material W having a length × width × thickness of 3500 mm × 1050 mm × 90 mm was prepared and cut. Further, in the case of bending into a curved surface shape, bending was performed with a dimension of 2500 R (mm) in the prototype of this embodiment.

As described above, in the embodiment of the present invention, a bead sheet material for mounting a rubber sonar dome of a ship is developed in advance in a plan view of a three-dimensional CAD figure of a plate-like steel material W to be curved. After setting the machining allowance K for forming the rough shape of the steel material W, the shape before bending is determined, and the machining allowance K is cut from the steel material W by a machine tool based on such three-dimensional CAD data. After the rough shape is processed, the steel material W is bent into a curved surface shape, and after the bending process, the restraining rib G is attached to maintain the curved surface shape, and then the periphery of the steel material W is melted and the final processing is performed. As a result, it is possible to manufacture products with high quality and low cost without considering model costs and repair costs like conventional casting products, and without performing penetration inspection and X-ray inspection. is there.

It is a partially expanded sectional view of the corner part attachment structure of the bead seat in the bow side of an observation ship. It is the three-dimensional CAD figure (three-dimensional computer aided design drawing) which bent the steel material. It is the three-dimensional CAD figure (three-dimensional computer aided design drawing ) which developed steel materials in the top view. FIG. 3 is a perspective view of a steel material obtained by bending a steel material into a curved shape after machining a rough shape by machining a machining allowance from the steel material. It is a perspective view of the steel material which attached the restraint rib in order to maintain the curved-surface shape of steel material after the bending process of steel materials. It is a front view of the steel material which carried out the last process by fusing the circumference | surroundings of the bent steel material. It is a BB arrow perspective view of FIG. It is CC arrow perspective view of FIG. It is a perspective view of the bead seat for attaching the rubber sonar dome in the bow side of the conventional observation ship. FIG. 10 is a partially enlarged sectional view of a portion X in FIG. 9.

1 Submarine 2 Rubber Wind 3 Bead Seat 5 Bead Clamp 6 Fairing Plate S Three-dimensional Cad Diagram Sa Three-dimensional Cad Plane W Steel Material K Cutting Allowance G Restraint Rib

Claims (2)

In advance, a three-dimensional cad diagram of a plate-shaped steel material to be processed into a curved surface is developed into a plan view, and after setting a cutting allowance for forming the rough shape of the steel material from this development view, the shape before bending is determined. Based on the three-dimensional CAD drawing data of the shape before bending determined in this way , after cutting out the machining allowance from the steel with a machine tool and processing the rough shape, the steel is bent into a curved shape and bent A method for bending a steel material of a bead sheet material to which a rubber sonar dome for a ship is attached , characterized in that after a restraining rib is attached in order to maintain a curved shape later, the periphery of the steel material is melted and final processing is performed. The method for bending a steel material of a bead sheet material for attaching a rubber sonar dome for a ship according to claim 1 , wherein the plate-shaped steel material is a steel plate having a thickness of 100 mm to 150 mm.

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