JPH0110088Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of the housing of a rolling machine used for rolling steel strips, thick plates, etc., and is intended to reduce inward warping deformation due to rolling loads.

Recently, rolling machines are being used with large rolling loads and under harsh conditions in order to improve the quality and economic efficiency of rolled products, and at the same time, requirements for plate thickness and shape accuracy have become stricter in order to achieve higher precision. .

For example, a four-high rolling mill, which is one of the conventionally used rolling machines, has the following characteristics as shown in Figure 1:
A pair of upper and lower work rolls 2 that clamp and press the material to be rolled 1
Both ends of the work roll 2 are rotatably supported by a work roll chock 3, and a pair of backup rolls 4 are disposed above and below the work roll 2, and both ends of the back roll 4 are rotatably supported by a backup roll chock 5. Then, each roll check 3,
5 is mounted within the housing 6. This housing 6 is formed of a pair of upper and lower beams 6a, 6b and a pair of left and right posts 6c facing each other between these beams 6a, 6b, and a lowering device 7 for applying a lowering force is mounted on the upper beam 6a. The rolling screw 8 is in contact with the upper end surface of the back-up roll chock 5, so that the rolling load is borne by the housing 6.

When a large rolling load is applied to a rolling mill having such a structure, the housing 6 undergoes elastic deformation in the longitudinal direction, and at the same time, as shown in FIG. 2, elastic deformation occurs in which the posts 6c curve inward, that is, so-called inward warpage.

The main cause of this inward deformation is the stress caused by the rolling load being transmitted to the post 6c via the upper and lower beams 6a, 6b. As shown in FIG. 3, the stress distribution is large on the inside of the housing 6 and small on the outside. For this reason, post 6
The main axis XX of c and the neutral axis are eccentric by an amount of eccentricity e, and the post 6c is bent by this eccentricity, so as shown in Fig. 4, the post 6c
is deformed inward.

Therefore, usually each roll check 3,
5 and the housing 6, an appropriate gap is provided so that each roll chock 3, 5 can slide smoothly in the vertical direction even if the post 6c is warped due to rolling load. If the gap is too small, it will cause hysteresis, while if it is too large, there will be drawbacks such as chatter in the rolled material due to vibration of the roll chock and an increase in impact force acting on the rolling mill. and causes a decrease in rolling accuracy.

Therefore, as a method to reduce inward deformation,
Possible methods include making the rigidity of the upper and lower beams significantly larger than that of the post, or adding a bulge to the connection between the beams 6a and 6b and the post 6c, as shown in Figure 5, but these methods are economical. There are problems such as the problem of quality and the increase in the number of processing steps, as well as the difficulty of on-site installation.

It is an object of the present invention to provide a housing for a rolling machine that eliminates such conventional problems and can reduce inward deformation with a simple structure. The structure of the present invention that achieves this purpose is to integrally form a pair of posts facing each other between a pair of upper and lower beams that have sufficient rigidity against rolling loads, and have the posts have the same cross-sectional shape. It is characterized by being formed so that its main axis is on the inside.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 6 is a front view of an embodiment of the housing for a rolling machine according to the present invention when applied to a rolling mill.

The housing 10 has a pair of upper and lower beams 10a.
and lower beam 10b, and these beams 10
A pair of left and right posts 10 facing each other between a and 10b
c has an integral structure. These upper beam 10a and lower beam 10b are sized to have sufficient rigidity against rolling load, while
As shown in FIG. 7, the post 10c has a concave cross-sectional shape in which the outside of the housing 10 is hollowed out, and the main axis X--X of the cross section is formed toward the inside of the housing 10. .

In the housing 10 of the rolling mill configured as described above, when a rolling force P is applied by the rolling device (see FIG. 1) during rolling, for example, at the connection part between the upper beam 10a and the post 10c of the housing 10, The stress distribution is as shown in FIG. 6, and the distance between the main axis XX of the cross section of the post and the neutral axis of the connection, that is, the eccentricity e, is different from that of the conventional post 10c.
Because the cross-sectional shapes of the two are different, they are smaller. Therefore, the inward warpage of the post 10c is also reduced.

In other words, if the main axis XX of the cross section of the post 10c is set closer to the inside of the housing 10, the post 10c
Post 10 can reduce the inward deformation of
As shown in FIG. 8, the cross-sectional shape of c may be a trapezoid in which the inner width of the housing 10 of the post 10c is larger than the outer width.

Note that the cross-sectional shape of the post is not limited to the above-mentioned one, but may be any shape as long as the main axis of the cross-section is on the inside, and is appropriately selected in consideration of workability, economical efficiency, and the like. Also,
It can be applied not only to rolling mill housings, but also to rolling machine housings such as horizontal mills and vertical mills for blooming, hot or cold rolling, and thick plate rolling, as well as process lines for cold rolling, shears, etc. It can also be used as a housing for coilers, reducers, etc.

As described above in detail with the embodiments, according to the present invention, the amount of inward warpage can be kept within a predetermined limit while ensuring the necessary rigidity of the housing.

Therefore, high precision and high quality rolled products can be obtained even when used under large rolling loads and harsh conditions.

[Brief explanation of drawings]

Figures 1 to 5 show the housing of a conventional rolling mill, Figure 1 is a front view showing it together with a four-high rolling mill, Figure 2 is an explanatory diagram of the inward deformation of the housing,
Figure 3 is an explanatory diagram of stress distribution in the housing, Figure 4
The figure is an explanatory diagram of the inward warpage deformation of the post, Figure 5 is a front view of the housing, Figures 6 to 8 show an embodiment of the housing of the rolling machine of the present invention, and Figure 6 is a front view of one embodiment. 7 is a cross-sectional view of one embodiment of the post, and FIG. 8 is a cross-sectional view of another embodiment of the post. In the drawing, 10 is a housing, 10a is an upper beam, 10b is a lower beam, 10c is a post, and X-
X is the main axis of the cross section of the post.

Claims (1)

[Scope of utility model registration request] A pair of opposing posts are arranged between a pair of upper and lower beams that have sufficient rigidity to withstand rolling loads, and are integrally formed, while the cross-sectional shape of these posts is formed so that the main axis of the cross-section is on the inside. A rolling machine housing featuring: