JPH0321761Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a slitting roll device for long steel.

[Prior Art] A multi-strip rolling method for steel bars is disclosed in JP-A-59-24502. In this method, the inclination angles of a plurality of ovals surrounded by upper and lower slit rolls are specified, and a multi-strip steel bar is produced by using slit rolls with the inclination angles set in the same manner. The method is to introduce the preformed rough material into the slit roll shown in Figure 4, No. 6, and slit it, as shown in Figure 3 No. 5. Slitting was performed using a rolling roll device in which the slope m of the side flange was smaller than the inclination angle α of the interlocking blades.

[Problems to be solved by the invention] When slit rolling is performed in the slit hole type shown in Fig. 4, No. 6, a thrust force acts on the rolls, and the roll gap between the flange and the meshing blade becomes smaller. At this time, the flange portion comes into contact first to prevent the meshing blade portions from coming into contact.

In the conventional method, m is m = 8 to 10% for α = 10°
It was quite small (4.6° to 5.7° inclination angle). In this case, when the gap between the upper and lower rolls is increased, the gap between the rolls at the meshing blade portion becomes larger, and conversely, when the gap between the upper and lower rolls is reduced, the gap between the rolls at the meshing blade portion becomes smaller.

The roll gap at the meshing blade part is an important element in slitting work, and it should be set to an appropriate value, i.e. 0.3.
If the distance is not within the range of ~0.5 mm, good cutting cannot be achieved.

However, in the conventional method, as the interval between the upper and lower rolls is changed to adjust the size of the rolled material, or as the interval between the upper and lower rolls is changed to follow roll wear, the roll interval at the meshing blade part becomes larger. A problem has arisen in which the distance varies and in some cases goes out of the proper interval range.

[Means for Solving the Problems] The present invention forms a plurality of blind hole molds in the opposed parts of the upper and lower slit rolls, and forms flanges at both ends of the blind hole mold located on the end side of the blind hole molds. , in a slitting rolling roll device in which the plurality of hole dies are arranged so as to be inclined in the same direction with an inclination angle β, and slitting is performed during rolling by interlocking blades having an inclination angle α with the adjacent blind hole dies. Provided is a long steel slitting roll device, characterized in that the inclination angle γ of one of the flanges at both ends is within the inclination angle α of the interlocking blades ±3°.

[Function] In this invention, the difference between the inclination angle γ of the flange and the inclination angle of the engaging blade is within ±3°, so even if the interval between the upper and lower rolls is changed, the change in the roll gap at the engaging blade portion is extremely small. There is.

[Example] Figures 1 and 2 show an example of the slit roll hole type of the present invention.

1 is a slit hole type, 2 is an interlocking blade, and 3 is a flange. During slitting rolling, the upper and lower slit rolls 5, 5A receive thrust force from the rolling mill, and the upper and lower slit rolls 5, 5A
comes into contact.

At this time, a hole shape is cut in the area of the meshing blade 2 so as to form an appropriate roll gap (0.3 to 0.5 mm). γ is the inclination angle of the flange end face 4, α is the inclination angle of the meshing blade 2, and α-3°≦γ≦+3°.

When the interval between the upper and lower slit rolls 5, 5A is changed to adjust to the size of the rolling mill or to compensate for wear of the roll hole, the upper and lower slit rolls 5, 5A move parallel to the flange end surface. I will do it.

Further, the present invention will be explained in detail.

In FIG. 1, the gap between the upper and lower slit rolls at the meshing blade portion is g as shown. Let Δh be the amount of change in the distance between the upper and lower slit rolls in the vertical direction,
Letting Δg be the change in the gap g between the upper and lower rolls at the meshing blade portion due to the change in the interval between the upper and lower slit rolls, Δg is expressed by the following equation.

Δg=Δh×√1+ ² ×sin(α−δ) The amount of change Δh in the interval between the upper and lower slit rolls is within the range of Δh=±1.0 mm in normal operation.
The proper inclination angle α of the meshing blade is α=10°.

In order to perform good slitting, the amount of change Δg in the gap between the upper and lower slit rolls of the meshing blade portion needs to be within the range of ±0.05 mm.

From the above facts and the above formula, γ must satisfy α-3°≦δ≦α+3°. In this way α−3゜≦γ≦α＋
If δ is set in the range of 3°, even if the interval between the upper and lower slit rolls is changed, the roll gap at the meshing blade portion will only change slightly by ±0.05 mm or less.

[Effects of the invention] According to the invention, even if the interval between the upper and lower slit rolls is changed according to the convenience of the work, the change in the roll gap at the meshing blade portion is very small. In slitting operations, it is possible to maintain the proper roll gap of the interlocking blades necessary for good cutting, with great results.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of the slit roll hole type of the present invention, and FIGS. 3 and 4 are explanatory diagrams of the conventional method. α...Inclination angle of meshing blade, m...Inclination of flange, γ...Inclination angle of flange, 1...Slit hole type, g...Roll gap of meshing blade, 2...Matching blade, 3... Flange, 4...Flange end face.

Claims (1)

[Scope of utility model registration request] A plurality of blind hole molds are formed in opposing portions of the upper and lower slit rolls, flanges are formed at both ends of the blind hole mold located on the end side of the blind hole molds, and the plurality of hole molds both have an inclination angle β. In a slitting rolling roll device that performs slitting during rolling using meshing blades that are arranged to be inclined in the same direction and have an inclination angle α with the adjacent blind hole type, the inclination angle of one of the flanges at both ends is 1. A slitting roll device for long steel, characterized in that γ is formed at an angle within the inclination angle α of ±3° of meshing blades.