JPS62127103A - Rolling method for corrugated sheet - Google Patents

Abstract

PURPOSE:To reduce the cost of producing a corrugated sheet by subjecting a hot material to flat rolling up to before the final pass while reversing said material, then to the rolling of the final pass by using caliber rolls. CONSTITUTION:The hot material 2 is subjected to reverse rolling and to the finishing pass with the final caliber rolls by using a 4Hi-5Hi selective rolling mill, by which the product corrugated sheet 2' is produced. The rolling mill is first set in the 4Hi rolling stage and the thick-walled material 2 is flat rolled down approximately to the product sheet thickness, i.e., to before final several passes while the material is reversed by the flat rolling mills 3, 4. The rolling work is then stopped and a back up roll 5 and the flat roll 3 are raised. A caliber roll 7 is built in to convert the rolling mill to the 5Hi mill. The rolling of the final finishing pass is executed by such roll to obtain the corrugated sheet 2'. Since the corrugated sheet 2' is easily roll-formed with the same rolling stand, the production cost of is reduced.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for rolling corrugated sheets.

[Prior Art] Conventionally, as shown in FIG. 7, a side plate of a ship is supported by a flat plate a having a required uniform thickness by welding angle members.

However, even if the above-mentioned flat plate a has a sinusoidal shape, for example, where only the part supported by the angle material is thick and the other parts are thin, there is no problem in strength. , it can be made easier to understand. For this reason, in recent years, various attempts have been made to form corrugated plates c and c' as shown in FIGS. 8 and 9, for example.

[Problems to be Solved by the Invention] However, it is very difficult to mold the corrugated plates c and c' as described above. For example, when trying to form a corrugated plate C with a sinusoidal wave shape as shown in FIGS. 8 and 9 by continuous rolling, rolling is performed using a large number of specially shaped rolls that match the sinusoidal shape. In this case, the contact area with the roll that transmits the backup force becomes close to point contact, making it impossible to apply a large backup force, which requires a large number of rolling stages. Providing such rolling equipment for forming corrugated sheets is very uneconomical, and since the special rolls are easily worn out, they must be replaced frequently, reducing productivity and significantly increasing production costs. There is.

The present invention was made by focusing on the above-mentioned conventional problems.
The purpose is to form corrugated sheets with simple equipment and high productivity.

[Means for solving the problems] The present invention attempts to solve the above technical problems, and
A corrugated sheet is formed by flat-rolling the hot material until it is close to the thickness of the product sheet while reversing the hot material, leaving a final pass, and then rolling a finishing pass using grooved rolls to form a corrugated sheet. This relates to a plate rolling method.

[Function] Therefore, in the present invention, the hot material is first flat-rolled to near the thickness of the product board using flat rolling rolls while reversing the hot material.
Thereafter, a corrugated sheet is formed by finish rolling using grooved rolls.

[Implementation Example 1] Embodiments of the present invention will be described below with reference to the drawings.

Figure 1.2 shows the state in which the hot material 2 is reverse rolled by the 4Hi-5Hi switching mill 1.
5 and 6 are flat rolling rolls, 5 and 6 are backup rolls, 7 is a slotted roll that can be inserted between the flat rolling rolls 3 and 4, and 8 is a support roller for covering the hot material 2 in reverse.

The grooved roll 7 has a large diameter portion D as shown in Fig. 2.3.
1 and small diameter portions D2 are formed alternately, and the large diameter portion D
1 and the size of the small diameter portion D2 are determined by the required wall thickness dimensions of the thin wall portion W+ and the thick wall portion W2 of the corrugated plate 2'.

Further, the lengths Ll and L2 of the large diameter portion D1 and the small diameter portion D2 are determined based on the strength of the corrugated plate 2' and the strength of the grooved roll 7 backed up in contact with the flat rolling roll 3, and are In this case, L1 and L2 have approximately the same length. In the case of FIG. 3, both the large diameter part D1 and the small diameter part D2 of the grooved roll 7 have a straight shape, but in the case of FIG. It has a straight shape, and the other portion D2 has a curved shape.

To form a corrugated sheet, first, in the 4-high (4Hi) rolling state of the 4hi-5H1 switching mill shown in Fig. 1, a thick hot material 2 such as a slab is rolled to a product sheet thickness using a flat rolling roll 3.4. Flat rolling is performed while reversing the rolling process until near the end, that is, before the final few passes (for example, 3 passes), which are the finishing passes.

Next, the rolling operation is stopped, and the backup roll 5 and the flat rolling roll 3 are raised as shown in FIG. 2, and a grooved roll as shown in FIG. 3 or 4 is placed under the flat rolling roll 3. 7 (as a 5Hi mill), and then the corrugated sheet 2' is formed by performing a final finishing pass of rolling using the grooved roll 7 and the flat rolling roll 4.

In the above, the thin portion W1 of the corrugated sheet 2' can be made thinner to a fraction of the thickness of the thick inner portion W2, thereby making it possible to significantly reduce the material cost and weight of the corrugated sheet.

5 and 6 show other embodiments of the present invention,
FIG. 5 shows the case where the flat rolling roll 3 in the 4Hi mill shown in FIG. 1 is replaced with a grooved roll 3'.
The figure shows a case where the flat rolling rolls 3.4 are replaced with grooved rolls 3' and 4', and even in this case, a corrugated plate can be formed in the same manner as in the previous embodiment.

Note that the present invention is not limited to the above-mentioned embodiments, and various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As described above, according to the corrugated sheet rolling method of the present invention, the hot material is first flat-rolled to a thickness close to the product sheet thickness using a 4Hi mill while reversing the material, and then a grooved roll is installed. Since the corrugated sheet is formed by finishing rolling with a 5Hi mill, it is possible to efficiently roll the corrugated sheet, and it is easy to roll using only a 4Hr-5Hr switching mill and one slotted roll. It can be carried out at low cost using equipment, and by making the large diameter part of the grooved roll straight to ensure a contact surface with the flat rolling roll, it is possible to load a large backup force and improve the roll strength. , and other excellent effects.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams showing the operation of the 4+*-5Hi switching mill that implements the present invention, FIGS. 3 and 4 are explanatory diagrams showing examples of the shape of the grooved roll, and FIGS. Fig. 6 is an explanatory diagram showing another embodiment of the present invention, Fig. 7 is an explanatory diagram showing an example of a conventional ship side plate, and Figs. 8 and 9 are explanatory diagrams of conventionally considered corrugated plates. . 1 is a 4H1-5Hr switching mill, 2 is a hot material, 2' is a corrugated plate, 3.4 is a rolling roll, 3' and 4' are grooved rolls, 5
, 6 is a backup roll, 7 is a grooved roll, and 8 is a support roller. Figure 5 Figure 6 Figure 9 Figure 5-' Figure 1 Figure 2 Figure 3! .

Claims (1)

[Scope of Claims] 1) Forming a corrugated sheet by flat rolling the hot material until it is close to the thickness of the product sheet, leaving a final pass while reversing the material, and then rolling a finishing pass using grooved rolls. A corrugated plate rolling method characterized by: 2) Using a rolling mill that can switch between 4Hi and 5Hi, first perform flat rolling with four-high flat rolling rolls while reversing the hot material, leaving a final finishing pass until it is close to the thickness of the product plate, and then the above-mentioned rolling. A method for rolling a corrugated sheet, characterized in that a corrugated sheet is formed by incorporating a grooved roll into a machine and rolling a finishing pass using the grooved roll and a flat rolling roll.