JPS62234601A - Production of stiffener - Google Patents

Abstract

PURPOSE:To easily obtain a stiffener having the dimensional shape necessary for strength by adjusting the difference in the rolling force between work side and driving side of upper and lower rolls, forming an I-beam of a bent type at the controlled rate of meandering and cutting the I-beam, thereby producing the stiffener. CONSTITUTION:The stock 6 is rolled by a caliber rolling mill 5 provided with upper and lower caliber rolls 4, 4. A difference is provided to the rolling force PW on the work side and rolling force PD on the driving side to be exerted to the rolls 4, 4 to forcibly meander the stock 6, by which the draft is controlled and the I-beam 7 of the bent type is formed. The web of such I-beam 7 is thereafter cut longitudinally as shown by a cutting line 8 to obtain the stiffener 9. The stiffener 9 is further cut in the part of valleys and is attached between longitudinal strakes. The weight in the part which is not required in terms of strength is thereby eliminated and the weight of a ship is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of manufacturing a stiffener to be attached to the inner surface of a ship's outer skin or the like.

[Prior Art] For example, in a ship, as shown in FIG. Material 3 is installed. The stiffener 3 is usually made by cutting a web of square-shaped steel along its longitudinal direction.

“Problems to be Solved by the Invention” If the stiffener 3 is viewed only from the viewpoint of strength, the hatched portion in FIG. 7 is unnecessary (redundant). The parts of the outer skin 1 near the longerons 2, 2 in the partitioned area are also reinforced by the longerons 2, 2, so the stiffener 3 is actually a curved shape excluding the hatching part. However,
Conventionally, it was difficult to make shape steel into a curved shape.
As mentioned above, since the square steel of the same size throughout the entire span is cut and used as the stiffener 3, the weight of the unnecessary portion shown by the hatching acts extra on the hull.

In view of these circumstances, the present invention aims to obtain a stiffener having the necessary dimensions and shape in terms of strength using a simple method.

[Means for Solving the Problems] The present invention consists of: (1) Rolling the material while controlling the meandering motion by creating a difference in the rolling reduction ratio between the working side and the driving side of the upper and lower rolls in a rolling mill for forming shaped steel; to form a bent type 1 steel,
The shaped steel is cut along the longitudinal direction at the web portion to form a stiffener.

[Function] Therefore, a curved type 1 steel can be easily formed, and by cutting it, a stiffener with no unnecessary parts can be obtained.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

As shown in FIG. 3, a material 6 is rolled in a groove rolling mill 5 equipped with upper and lower groove rolls 4, 4.
By forcibly making the material 6 meander by creating a difference between the rolling blade Pw on the working side and the rolling blade P on the driving side, which apply to the rolling blade 4, and controlling the rolling ratio, a wave curve as shown in Fig. 1 is created. type or a bent type such as a bent type as shown in Fig. 2 T type 1Jri47
Thereafter, the web of the square shaped steel 7 is cut along the longitudinal direction as shown by the cutting line 8 to form a stiffener 9.

Then, such stiffener 9 is further cut at the valley part, and the fifth stiffener 9 is cut.
Install it between the stringers 2 and 2 as shown in the figure.

This makes it possible to eliminate the weight of parts that are unnecessary in terms of strength, making it possible to reduce the weight of the ship.

FIG. 4 shows another example of a rolling mill for producing a curved type steel 7, in which a universal rolling mill 12 is provided with upper and lower horizontal rolls 10, 10 and left and right vertical rolls 11, 11.
It shows. In this method, as in the case of FIG. 3, a curved type 1 steel 7 can be obtained by rolling with a difference between the rolling blades PW and PD of the horizontal rolls 10 and 10.

Furthermore, if the left and right vertical rolls 11, 11 are enabled to move in the direction of the pass line and the offset position is controlled, it becomes easier to obtain a bent shape.

In the above embodiments, the case is shown as a stiffener attached to the outer panel of a ship, but it can also be used as a stiffener of a tank, an aircraft, etc., for example.

[Effects of the Invention] As explained above, according to the present invention, curved type steel can be manufactured by controlling the meandering amount by adjusting the difference between the rolling blades on the working side and the driving side applied to the upper and lower rolls of the rolling mill. Make this■
Since the stiffeners are manufactured by cutting the shaped steel, the manufacturing process is simple, and when used as stiffeners for ships, etc.
Since there is no unnecessary part for strength, it is possible to achieve the excellent effect of reducing the weight of ships, etc.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams of the type steel obtained in the process of the method of the present invention, Figure 3 is a schematic diagram of the rolling mill used in the method of the present invention, and Figure 4 is another example of the same rolling mill. An explanatory diagram of an example, FIG. 5 is a diagram of the installation state of the stiffener manufactured by the method of the present invention,
FIG. 6 is a perspective view showing a state in which a conventional stiffener is attached, and FIG. 7 is a plan view of the same. 4 is a groove roll, 5 is a groove rolling machine, 6 is a raw material, 7 is a type steel, 8 is a cutting line, 9 is a stiffener, 10 is a horizontal roll, 12
indicates a universal rolling mill. -5= Figure 1 Figure 2 Figure 3 Figure 4 PwPDFWP.

Claims (1)

[Claims] 1) By setting a difference in the rolling reduction ratio between the working side and the driving side of the upper and lower rolls in a rolling mill for forming I-shaped steel, the material is rolled with meandering control to form a bent I-shaped steel, and the formed I-shaped steel is A method for manufacturing a stiffener, which comprises cutting along the longitudinal direction at a web portion to form a stiffener.