JPS63174707A - Multistage rolling mill - Google Patents

Abstract

PURPOSE:To perform a crown control for the roll shaft of a rolling mill by segmenting a hollow roll shaft into pieces by every length penetrating into each bering and segmenting a saddle into the right and left parts sandwiching each bearing. CONSTITUTION:A supporting roll 16 consists of a roll shaft 17, plural bearings 18 being brought into contact with the shaft 17, and saddles 19. The shaft 17 is formed from a hollow shaft and is segmented into pieces of the same number as that of the bearings 18. The saddle 19 is segmented into the right and left parts sandwiching the bearings 18 and is provided with wedge blocks 25. The blocks 25 are pushed by the movement of wedges 30 to perform crown adjustment. In that time, each segmented roll shaft 20 change its position independent of respective adjacent segmented rolls 20... and gives a deformation amount due to the position change to the shaft 17. Thus, a large deformation of the shaft 17 is obtained to increase the crown control effect.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a multi-high rolling mill that performs crown adjustment by deflecting a support roll via a wedge block by moving a wedge, particularly to improving the structure of the support roll.

(Prior art) In a multi-high rolling mill configured as shown in Fig. 5.6, (
+) (2) is the mill housing, (3) (4) is the work roll, (5) (Ili) is the backup roll, (7) (
8) shows the support roll, and the crown adjustment for correcting the shape during rolling of the rolling mill is carried out by the shaft (10) by the drive motor (9).
is rotated, the wedge (11) is raised and lowered, and the wedge block (+2) is moved, and the supporting roll shaft (13) (shown in FIG. 5) is thereby bent.

Conventionally, the support roll structure has a roll shaft (13) with a plurality of bearings (14) between them, and each bearing (I4) is sandwiched from both sides by a saddle (15), as shown in Fig. 5. Then, L edge block (1
The force 2) is applied to the roll shaft (+3) through the saddle (15) to cause pinching deformation of the roll shaft (13).

(Problem to be solved by the invention) However, since the conventional roll shaft (13) is made of a long wooden shaft, the wedge block (I2) is pushed out and the support roll (7) is crowned. Even if you try,
Since the roll shaft (13) has a large bending resistance (rigidity) and is therefore difficult to pinch, there is a problem in that a large round cannot be attached, as schematically shown in the schematic diagram (A) of FIG. Also,
If the roll shaft (13) is made thinner, it will be easier to pinch (but it will not be able to absorb the rolling reaction force well due to insufficient strength).

An object of the present invention is to solve this problem (means for solving the problem). Of the support rolls consisting of saddles that support the roll shaft in a state where the roll shaft is It features a multi-high rolling mill that is divided into left and right sections.

(Function) According to the present invention, since the roll shaft is divided 1, the bending resistance of the entire roll shaft does not act on the movement of the divided roll shaft assembly 1f, and therefore, each divided roll shaft and As a result of the movement of the bearing fitted over this, the amount of deformation of the support roll shaft increases.

In addition, since the roll shaft is a hollow shaft, when recombining the rolls, the connecting bolts are inserted into the hollow part and the roll shaft, bearings, and saddles are integrally assembled. The inside of the shaft can be used as a supply path for bearing lubrication coolant.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

As shown in Figures 1 and 2, the support roll (1B) includes a roll shaft (17), a plurality of bearings (+8) fitted onto this, and a roll shaft with bearings (18) sandwiched between them. (17) and a saddle (19) that supports the saddle (17). Among these, the roll shaft (17) is composed of a hollow shaft,
It is divided into the number of bearings (18) used.

This divided roll shaft (20) is divided into lengths sufficient to pass the bearing (18) through the shell and have both ends supported by saddles (19) described below.

The saddle (+9) is divided into left and right parts that sandwich each bearing (18), and left and right parts that support a split roll shaft (20) that passes through the bearing (+8).

When rearranging the rolls, place one on the split roll shaft (20).
Fit the bearings (18) one by one and the saddle (19).
) are pressed against each other from both sides, the bearing (18) is sandwiched between both saddles (+9) (19), and both ends of the split roll shaft (20) are fitted into the saddles (19) (19) to form one block. The supporting rolls (16) are assembled integrally by inserting the connecting poles (21) shown in FIG. 1 into these blocks. For this reason, the concatenation pol)
The end split roll shaft (2+) on the opposite side from the side where you insert the
0) has a screw (2) in its hollow part (22) as shown in Fig.
3) and threading the connecting bolt (21) thereto prevents the support roll (1B) from disassembling during roll recombination. In addition, the hollow part (22
) is used as a supply path for lubricating coolant for the bearing (18), so the opposing split roll shaft (2
0) A sealing O-ring (24) is fitted on either side of (20) to prevent leakage of the coolant described in -1-.

Thus, the support roll (16) integrated by the connecting bolt (21) is restrained between the split roll axes by attaching its saddle (+9) to the wedge block (25) and then removing the connecting bolt (21). dissolve the power.

In addition, the hollow part (22) on the side where the connecting pole (21) is removed
) is plugged with a plug (2B), and the other end is communicated with a coolant supply hole (29) on the mill housing (28) side via a ring packing (27).

By doing so, when the wedge block (25) is pushed out by the movement of the wedge (30) and the crown adjustment is performed, each divided roll shaft (20) moves in position without being restrained by the adjacent divided roll shaft. The entire roll shaft (7) can be deformed as shown in the schematic diagram (B) of FIG. 3, and the amount of deformation becomes large and the degree of freedom of deformation increases.

(Effects of the Invention) - As described in detail, according to the present invention, large deformations of the roll shaft are possible without reducing the shaft strength, and the degree of freedom in deformation is high, making it possible to make complex shape modifications. Therefore, the effect of crown control becomes remarkable.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a support roll showing an embodiment of the present invention, Figure 2 is an enlarged view of the main part of Figure 1, and Figures 3 (A) and (B).
is a schematic diagram comparing the degree of roll axis deformation between the present invention and a conventional device; FIG. 4 is a partially cutaway front view showing an example of a conventional multi-high rolling mill; and FIG. It is. (16)...Support roll, (17)...Roll shaft,
(18)...Bearing, (+9)...Saddle, (
20)...Split roll shaft, (25)...Wedge block, (30)...Wedge. Figure 1

Claims (1)

[Claims] In a multi-high rolling mill that performs crown adjustment by deflecting the support roll via the wedge block by moving the wedge,
A support roll consisting of a roll shaft, a plurality of bearings fitted onto the roll shaft, and a saddle that supports the roll shaft with each bearing sandwiched from both sides, the roll shaft being constructed from a hollow shaft, A multi-stage rolling mill in which the hollow roll shaft is divided into lengths that pass through each bearing, and the saddle is divided into left and right parts that sandwich each bearing.