JPS5850110A - Multistage cluster rolling mill - Google Patents

Abstract

PURPOSE:To control a material to be rolled to good shapes by making intermediate rolls movable in their axial center directions and providing means which apply roll bending forces independently upon the intermediate rolls and the work rolls. CONSTITUTION:Pressure is applied respectively at both ends of work rolls 2 and intermediate rolls 3 by means of oil hydraulic cylinders 11 and 12 to act bending forces which negate the deflections of these rolls by rolling load. Then the rolls 3 bend along divided backup rolls 4, and the rolls 2 bend along the rolls 3. When the rolls 3 are moved in their axial center directions to bring the crowned parts close to the end parts of a material 1 to be rolled, the parts of the rolls 2 projecting from the material 1 are released of bending restraints by the rolls 3, and the parts of the rolls 2 near the end part of the material 1 are bent to a projecting shape by the bending forces of the rolls 2 and the distributions of the rolling reactions from the material 1, whereby edge drops are prevented.

Description

[Detailed Description of the Invention] Hontate @ Co., Ltd. relates to a multi-stage Clasp rolling mill that can control rolled members in good shape and shape.

In recent years, from the viewpoint of improving productivity and saving energy, there has been a demand for high-reduction rolling mills that can reduce the thickness of the plate by a large amount in one rolling process. This is because good thickness accuracy and high crystallinity for the plate shape are required.

Multi-stage class 4 that enables cold rolling under high pressure! There is a rolling mill. This multi-stage cluster rolling mill has the advantage that the outer diameter of the work rolls can be made small, making it possible to achieve a high rolling reduction with a small rolling load. Tohiro is outside the work roll.
If the pressure IIO is made smaller, the work roll OII will be deformed due to the load of the pressure IIO, and the shape of the pressure resistance material will likely become defective.

As one of the means for controlling the shape of the rounded rolled material, the following method is used, namely, the reinforcing roll is divided in the axial direction of the reinforcing roll, and the axial center position of each of the nine rolls is change. Then, in order to thicken the central part of the rolled it material, split reinforcing rolls as shown in *SWa are set in a convex shape with respect to the work rolls, and the intermediate rolls and work rolls are reinforced by the rolling load. The rolls are used to cast the material in a direction opposite to the direction in which the intermediate roll and the work roll OII are rolled so as to obtain a rolled material having a constant thickness in the L/N direction.

However, for pigeon lofts where the width of the material to be rolled is smaller than the length of the roll, most of the rolling load is applied to the center of the roll.
The intermediate roll and work roll are difficult to bend along the convex reinforcing roll at the center like the above-mentioned $1311, and furthermore, the contact deformation between each roll is larger at the center, so the shape deformation of the rolled material is corrected. The effect of the convex deformation of the reinforcing rolls provided for this purpose is not sufficiently transmitted to the work rolls, and the shape deformation of the rolled material (rapid reduction in thickness at the M end) is sufficiently prevented. Can not.

In addition, the shape can be controlled by applying a bending force in the opposite direction to the bending force due to the rolling load to the work roll in the intermediate roll, or by reducing the center of the outer diameter tube at the end of the q-roll so that this small-diameter portion is covered. There is a roll shift method in which the shape of the end of the rolled material is controlled by moving the roll in a fine direction so as to make contact with the end of the rolled material, but none of these methods can achieve the same effect as a single experiment.

Therefore, the present invention eliminates these drawbacks and combines conventionally used shape control methods to create a multi-stage rolled material of higher quality! A rolling mill is provided, and its configuration line consists of a pair of work rolls installed so as to sandwich the material to be rolled, a medium M roll that supports two roaring work rolls each, and a middle M roll that supports the intermediate roll. A plurality of reinforcing rolls are arranged symmetrically with the assumed material to be rolled, and in a nine-stage cluster rolling mill, at least four pairs of reinforcing rolls symmetrical to the material to be layered and rolled are divided. Crown*
*Possible eccentricity is possible! The intermediate roll is moved in the axial direction, and a means is provided for independently applying roll tension to the intermediate roll and the work roll.

The following is a detailed explanation based on an example that illustrates this book**.
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Figure 111 shows an embodiment of the present invention, and Figure 2 shows a drop of 1 m1.
FIG. A pair of upper and lower work rules 2 are provided so as to sandwich the rolled #1. Two intermediate rolls 3 supporting the work roll 2 are provided below the upper work roll 2 and the lower work roll 2, respectively.
is provided. Furthermore, in order to support the intermediate roll 3 under the upper intermediate roll 3 and the lower intermediate roll 40, three reinforcing rolls 4 are provided for each miner in this implementation. It is arranged symmetrically with the rolled material l. Both ends of the reinforcing roll 4, intermediate roll 4, and work roll 20 are supported by metal vines 5, 7.8, respectively. The metal chock 5 is provided inside the housing 1G so as to be slidable in the vertical direction. As shown in Fig. 82, the reinforcement is divided into multiple pieces of 4 holes, and the metal base is divided into 4 pieces. They are respectively provided on the fixed shafts 5& through eccentric wheels 14. The eccentric wheel 14 is eccentrically located between the inner diameter and the outer diameter, and is rotated and fixed relative to the axis No. ls], thereby changing the center position of each reinforcing roll 4, and making the third cabinet as a whole. You can make round adjustments as shown in .

This is 5 & 111 strong! -1) Metalte Yotsuta supporting 4! The 1KFi support 7 frame 6 is attached to the TIIL, and the rolling device 9 lowers the support 7 frame 6 to the rolled material 10 direction.
It is a hydraulic cylinder that moves in the opposite direction. The metal chocks 7 are of a pair of upper and lower metal chocks, each of which is of a sliding V type so that the intermediate roll 3 can be displaced symmetrically with respect to a straight line passing through the axis of the upper and lower work rolls 10. A hydraulic cylinder 12 for applying a pending force to the intermediate roll 3 is located between the metal chock 7 and the housing IO. As shown in FIG. 4, at both ends of the intermediate roll 30, crowned parts 3a and joints 3b are provided toward the ends, and both ends are connected to a moving device (not shown), making it possible to move in the axial direction of the intermediate roll 3. . and work roll 2
The intermediate roll 3, which requires a large drive input energy because the external value of the intermediate roll 3 is small, is rotated by a drive device (not shown). A metal chock is provided between the upper and lower metal chocks 7. A hydraulic cylinder 11 for applying pendency to the work roll 4 can be seen between the upper and lower metal chucks 80 that support the upper and lower work rolls 2.

The operation of such a multi-stage talaster compaction machine will be explained.

Fig. 5 and Fig. 781 show the rolling conditions when the rolled material O@B with respect to the roll length O is B/j-1,0, B/j-0,5, respectively, and the contact surface of the roll at that time The pressure distribution is shown in Figure 6, If! It is shown in Figure 8. The amount of flattening due to the compression of the roll is approximately proportional to the contact surface pressure, so if the contact surface pressure difference of the rolled material is large t1 as shown in Figure 1!
In order to reduce the amount of roll flattening, it is necessary to take into account the increase in crown.

Figures 1 and 9 show the situation in which the crown is adjusted as shown in Figure 3 (with the butterfly-split reinforcing roll 4), but the abrasions still occur. Expansion qK from rolled material l
This is because the contact pressure of the work roll 20 bends both ends of the work roll 20 downward and presses the end of the rolled material 10 more strongly, and the amount of flattening of the surface of the work roll 2 rapidly decreases at the end of the rolled material 1. , it becomes a lance shape like 11 in Figure 110. The work roll 2 is moved by hydraulic cylinders 11 and 12 against the burrs.
Pressures R+ and R1 are applied to both ends of the intermediate roll 30, respectively, and a pen pressure is applied to cancel the deflection of these rolls due to the so-called rolling load. Then, the intermediate roll 3 splits and bends along the reinforcing roll 4, and the work roll 2F
! Since it bends along the scissor intermediate roll 3, it takes on the sn shape of al in FIG. 10. The shape of the entire roll due to such roll bending is a very gentle parabolic curve, and the sharp edge at the end of the rolled material cannot be completely spun.
The roll 3 is moved in the axial direction as shown in Figure 11 O, and the crowned part 3a is brought closer to the end of the rolled material l (a-ru shift), then the rolled material of the work roll 2! The part that has been run over is released from the restraint by the intermediate roll 3,
Due to the rolling reaction force distribution from the rolling process of the work roll 2 and the rolling reaction force from the rolled material 1, the end of the rolled material 1 of the work roll 2 can be spun in a convex manner with respect to the pressed abrasive material 1. can. In this case, the smaller the rigidity of the workpiece hole 10 and the smaller the outer diameter, the more effective it is.

The shape of the koji mold formed in this way is shown in Fig. 10. When roll shifting is in danger, the intermediate rolls 3 above and below the plate are moved mirror-symmetrically as shown in Fig. 11.
The cross-sectional shape of is not vertically symmetrical as shown in FIG.

Therefore, by rolling with a mourning mill with the trowel roll shift direction alternately reversed, and finally rolling with a finishing straight arc mill with a reduced load without performing roll shift F, a product with vertical symmetry and good shape O can be obtained. can be obtained.

In general, the shape of a rolled material is determined not only by the elastic deflection of the rolls, but also by uneven flatness of the roll contact area due to uneven contact pressure between the rolls, thermal crowning due to uneven temperature of each part of the rolls, and a-roll O wear. However, as described in the embodiments with the drawings, the multi-stage Tarastar rolling mill according to the present invention has means for providing crown adjustment to the reinforcing rolls, intermediate rolls, and workpiece rolls. r/co
- It is possible to obtain a product with a good condition and a means of imparting a good grip.

In the present fR, we have explained the case of a multi-stage cluster rolling mill with six stages on one side, but it is also possible to arrange an appropriate number of reinforcing roll tubes between the first reinforcing roll and the intermediate roll to form a multi-stage cluster rolling mill. I can do one thing.

[Brief explanation of drawings]

III Zusha An explanatory diagram showing an embodiment of the multi-stage cluster straight arc machine according to the present invention, FIG. 2 is an explanatory diagram expanded from FIG.
Figure (partial view of reinforcing roll with n-round adjustment, 94 Figures front view of intermediate roll, Figures 5 to 8 show the width of the material to be rolled with respect to the work roll, the contact pressure between the intermediate roll and the work roll, and the O Explanatory diagrams showing the relationship, FIGS. 9 to 11, relate to a multi-stage cluster rolling mill according to the present invention J), II! 9
W! :J. 111th! lIt! Figures 1 and 0 are diagrams showing the cross-sectional shape of the material to be rolled. In the drawing, l is the material to be rolled. 2 is a work roll 3 is an intermediate roll, 4 is a reinforcing roll. 5.7.8 wire metal tip, 6 is the support frame, 9 is the lowering device, 1O is the housing 1, 11.12.13 is the hydraulic cylinder, 14 is the core ring, 3a is the crown processing part, 3b is the joint, 5a is an axis. Patent applicant: Mitsubishi Heavy Industries, Ltd. Sub-agent Patent attorney: Shibu Mitsuishi (and 14 others) Ma 3
Illustration horse 4

Claims (1)

[Claims] A pair of work rolls installed to sandwich the material to be rolled, an intermediate roll for supporting each work roll with two rolls, and a plurality of O reinforcing rolls supporting the intermediate rolls are arranged in the above-mentioned manner. In the nine-stage cluster pressure that is arranged symmetrically with the rolling material, the symmetrical fk is applied to the assumed rolled material.
l) Divide at least a pair of 1k reinforcing rolls into variable eccentricity rolls with adjustable crowns, and
A multi-stage machine that is characterized by being able to move the roll in the axial direction, and by providing means for independently applying roll pending force to the wrinkled intermediate roll and the front roll! Raster rolling machine.