JPS6310162Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rolling mill that prevents warping of rolled plates and makes it possible to obtain products of good quality.

Conventionally, the upper and lower work rolls were made with different diameters, and the small diameter work roll was offset in the direction of rolling material progress5.
A corrugated rolling mill is used. However, in such a five-high rolling mill, warpage occurs in the rolled plate on the exit side of the rolling mill, which has an unfavorable effect on the final product.

For example, as shown in Figure 1, the lower work roll 2
When S is a small diameter and the amount of offset in the rolling direction with respect to the upper work roll 1 is e, the relationship between the outlet pass line angle θ of the rolled plate S and the plate warpage is illustrated in FIG. 2. In Fig. 2, curve A is the diameter D ₁ of the upper work roll 1 = 180 mmφ, the diameter D 2 of the lower work roll ₂ = 120 mmφ, and the offset amount e = 10.
The case of mm is shown, and curve B shows upper and lower work rolls 1,
The diameter of curve 2 is the same as that of curve A, and the offset amount e
= 20mm is shown. In either case, the entrance plate thickness is
0.25mm, rolling reduction rate is 30%. From this graph, in order to make the curvature of the board warp zero, the exit path line θ should be adjusted to the slope α of the straight line l ₂ formed by connecting the centers of the upper and lower work rolls 1 and 2 with respect to the perpendicular line l ₁ . It turns out that it is best to make it approximately equal to .

Therefore, as shown in Fig. 3, it has been considered to arrange guide rolls 10 on the exit side of a five-high rolling mill and roll with the exit pass line angle θ approximately equal to the slope α of the straight line _l2 . However, the guide roll 10 may be difficult to arrange due to space constraints.

In Fig. 3, 3 is an intermediate roll for the small-diameter lower work roll 2, 4 is an upper back-up roll, 5 is a lower back-up roll, and 6 is a roll bending curve of various shapes for the small-diameter lower work roll 2. 7 is a dividing roll for the presser roll 6, 8 is an unwinding machine, and 9 is a winding machine.

In view of the above-mentioned points of view, the present invention prevents warping of the rolled plate S even when the exit pass line angle θ is zero, that is, the rolled plate S is fed horizontally, and maintains good quality. This was done for the purpose of making it possible to obtain a product, and one of the upper and lower work rolls has a smaller diameter than the other work roll, and the smaller diameter work roll is used as the other work roll with a larger diameter. In a five- or four-high rolling mill that is offset in the rolling plate traveling direction with respect to a line connecting the center of the work roll and the center of the intermediate roll or back-up roll on the small-diameter roll side, the center of the large-diameter work roll and the intermediate roll The straight line connecting the centers of the rolls or back-up rolls is inclined in a direction parallel to the rolling plate traveling direction so that the straight line connecting the centers of the upper and lower work rolls is substantially perpendicular.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 shows an embodiment of the present invention, in which the center of the upper work roll 1 and the lower work roll are offset in a rolling mill in which the lower work roll 2 is offset from the line _l1 connecting the upper work roll 1 and the intermediate roll 3. The center line of the rolling mill housing is tilted clockwise by approximately an angle α so that the straight line l ₂ formed by connecting the centers of the rolling mill housings 2 and 2 is approximately vertical. As mentioned above, if the exit pass line of the rolled plate is adjusted to be approximately perpendicular to the straight line _l2 , the rolled plate S will be free from warping, so the straight line _l2 will have an inclination α with respect to the straight line _l1 . When the rolling mill housing is arranged so that

If rolling is performed in such a state, the rolled sheet S will not be warped.

FIG. 5 shows another embodiment of the present invention. In the embodiment described above, the straight line formed by connecting the centers of the upper and lower work rolls is made vertical by tilting the entire rolling mill housing. , in this embodiment, a line connecting the upper work roll 1 and the intermediate roll 3
In a rolling mill in which the lower work roll 2 is offset by e from l ₁ , the straight line l connecting the centers of the upper and lower back-up rolls is also vertical and is formed by connecting the center of the upper work roll 1 and the center of the intermediate roll 3. This is an example in which the straight line l ₁ is tilted by an angle α with respect to the perpendicular straight line l ₂ . Even in this case, the rolled plate S can be fed horizontally.

In FIGS. 4 and 5, the same reference numerals as those shown in FIG. 3 indicate the same components.

According to the rolling mill of the present invention, warping of the rolled plate can be prevented without special guide rolls and products of good quality can be obtained, and no special means are required to prevent warping. , equipment costs, operation and maintenance costs are low, and various other excellent effects can be achieved.

Note that the same idea can be applied to a four-high rolling mill in which there is no intermediate roll and the lower back up roll 5 is in direct contact with the lower work roll 2. In this case, the straight line l ₁ in Figures 3 to 5 is the upper work roll 1.
This is a line connecting the center of the lower back-up roll 5.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the exit pass line angle when the straight line formed by connecting the centers of the upper and lower work rolls is inclined, and Figure 2 shows the relationship between the curvature of board warpage and the exit pass line angle. Graph, Fig. 3 is an explanatory diagram of an example in which guide rolls are provided on the exit side of the rolling mill housing to prevent sheet warping, Fig. 4 is an explanatory diagram of an embodiment of the rolling mill of the present invention, and Fig. 5 is FIG. 3 is an explanatory diagram of another embodiment of the rolling mill of the present invention. In the figure, 1 is the upper work roll, 2 is the lower work roll, 3 is the intermediate roll, 4 is the upper back up roll, 5 is the lower back up roll, 6 is the presser roll, 7 is the split roll, l, l ₁ , l ₂ indicates a straight line.

Claims (1)

[Scope of utility model registration request] One of the upper and lower work rolls has a smaller diameter than the other work roll, and the small diameter work roll is connected to the center of the other large diameter work roll and the center of the intermediate roll or back-up roll on the small diameter roll side. In a 5-high or 4-high rolling mill that is offset from the line in the rolling plate traveling direction, the straight line connecting the center of the large-diameter work roll and the center of the intermediate roll or back-up roll is connected to the center of the upper and lower work rolls. A rolling mill characterized in that the rolling mill is tilted in a direction parallel to the rolling direction of the rolling plate so that the straight lines formed by the ties are substantially perpendicular.