JPS5994502A - Rolling method of bar steel - Google Patents

Abstract

PURPOSE:To stabilize the twisting and feeding of a material to be rolled by inducing slantly the material to the direction reverse to a twisting direction by a roll type inlet guide used for twisting the material provided to the inlet of a rolling mill at a front stage. CONSTITUTION:A material 1 to be rolled is slantly induced to the direction reverse to a twisting direction by a roll type inlet guide 2 provided to the inlet of a rolling mill A at the front stage, so that the material 1 has a prescribed twisting angle at the inlet of a mill B placed at the rear stage. For said purpose, the slant angle alpha of the guide 2 is set to an angle expressed by an equation (beta; a twisting angle of the material 1, L; the distance between the mills A and B, (l); the distance between the mill A and the guide 2).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of rolling a long steel strip by twisting the material between rolling mills.

Generally, in the continuous rolling of long steel, a group of rolling mills are arranged in series and the rolled material is rolled repeatedly in a roll groove pattern to achieve a set cross-sectional shape. 90mm of rolled material before biting
It is necessary to guide it by twisting it by 45° or 45°.

The conventional methods for twisting the rolled material between rolling mills include 0) using a fixed guide and twist rollers installed at the exit of the rolling mill, and 2) twisting the rolled material by shifting the upper and lower rolls of the rolling mill in the axial direction. It is being However, the method (■) using a twisted roller type rolling guide imposes a large load on the twist rollers and is difficult to maintain, and the method (@) in which the upper and lower rolls of the rolling mill are shifted is required to adjust the axial direction of the rolls. In other words, it is extremely difficult to decide which shots to take that will overlap the upper and lower rolls, resulting in a large time loss.

This invention was made to solve the above-mentioned conventional problems, and its gist is that a roller guide for twisting the rolled material is provided at the entrance of the rolling mill in the previous stage, and this entrance guide tilts the rolled material. A method of rolling a long steel is characterized by induction.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In FIG. 1, as a method of twisting a rolled material (1) between a rolling mill (A) in the first stage and a rolling mill (B) in the second stage,
Conventionally, a twist roller type guide (2) is provided at the outlet of the rolling +fi (A) in the previous stage, and the guide is used to twist the rolled material at each outlet. In this method, the load applied to the twist roller itself is large and it is difficult to adjust the upper and lower twist rollers in the axial direction. However, method 7 was adopted in which the rolled material was previously tilted in the opposite direction to the twisting direction using the roller Takeshiro guide (2) and guided into the roller hole shape of the rolled material (A).

In the figure, (1-1) to (1-5) indicate the cross-sectional shape of the rolled material (1) at each stage.

That is, in this invention method, the roller Takejin log guide (2) installed at the entrance of the rolling mill (A) at the front stage is rotated in the twisting direction so that the rolled material has a predetermined twist angle at the entrance to the rolling mill (B) at the rear stage. This is a method of guiding the body by tilting it in the opposite direction. Fig. 2 and Fig. 8 illustrate the loaf Takejin log guide according to the present invention, and although it is not structurally similar to the one normally used, the rolled material (1) A roller Bujin log guide (2) whose inclination angle α is set so as to have a predetermined twist angle is used. The inclination angle α of this roller bushin logai ν can be determined by the following formula.

However, α: Low-type large-input rolling guide inclination angle β: Twisting angle of rolled material L: Distance between rolling mills l: Distance between the rolling mill (A) and the rolling mill, for example, the rolling mill (A) at the front stage and the rolling mill at the rear stage (B) 4 rolls of rolled material (1) between rolling mills with a distance of 10 m.
When twisting by 5 degrees, if the distance l between the rolling mill (A) and the roller Takejin log guide (2) is 0.815 m, the inclination angle α of the roller Takejin log guide (2) is 1.42 according to the above formula (1). °. Therefore, in this case, the roller Takeshiro guide (2) is previously tilted by 1.42° in the direction opposite to the twisting direction to guide the rolled material into the groove of the rolling mill (A). the result,
When the rolled material reaches the rolling mill (B), it can be twisted by 45°.

In this way, in this invention, it is possible to twist the rolled material at a predetermined angle by simply tilting the rolled material in the opposite direction to the twisting direction using the rope guide (2) provided at the entrance side of the rolling mill (A) in the previous stage. Therefore, it is much easier to adjust than the conventional method of twisting the upper and lower rolls of a rolling mill, and the load on the guide roller is also smaller than that of the conventional twist roller. Therefore, the torsional and speed stability of the -C1 rolled material can be maintained for a long time.

Next, embodiments of the invention will be described.

[Example] In the Panu schedule shown in Table 1, in order to twist the rolled material between rolling mills A8 to A9 (distance 10 m), a roller Takehito guide was tilted by 1.42 degrees in the opposite direction of the twist. Installed at the entrance of the A8 rolling mill (distance from the rolling mill is 0.
A material with an angle of 815m)L and 18(Iff) was rolled to a product size of 40mm.As a result, the twisting condition of the rolled material between the A8 to 769 rolling mills was good, and stable speed control was obtained.

As explained above, according to the method of this invention, the rolled material can be twisted well and stably by simply tilting the roller Takeshiro guide at a predetermined angle, which is very useful for the continuous rolling of long steel. It is effective.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, FIG. 2 is a schematic side view showing an enlarged roller large-in log guide in the same example, and FIG. 8 is a front view of the same roller Bujin log guide in the same manner. 1...Rolled material, 2...Roller Takejinro guide, A...
・Previous stage rolling mill, B... rear stage rolling mill. Applicant Sumitomo Metal Industries Co., Ltd. Agent 1) Yoshihisa 5j11-ri

Claims (1)

[Claims] A method of rolling a rolled material by twisting it between rolling mills,
A second roller entry log guide for twisting the rolled material is installed at the entrance of the rolling mill in the first stage, and the second roller entry guide is rotated at an angle determined by the following formula so that the rolled material obtains a predetermined twisting angle at the entrance of the rolling mill in the second stage. A method for rolling a long steel, characterized in that the rolled material is guided at an angle in the direction opposite to the direction of twisting. σ=β・-7'c L, α: Roller type large input log guide inclination angle β:
Twisting angle L of rolled material: Distance between rolling mills 4: Distance between roller Takeshiro guide and rolling mill