JPH01249203A - Device and method for rolling - Google Patents

Abstract

PURPOSE:To reduce generation of plate crowns and edge drops by installing a 4-high roll and a 2-high roll in the inlet and outlet sides respectively, supporting the rolls by a common housing, and imparting a front tension to a rolled stock by use of the 2-high roll. CONSTITUTION:A 4-high roll 5 is composed of work rolls 1, 2 and reinforcing rolls 3, 4 and a 2-high roll 6 is composed of two work rolls 6a, 6b. The 4-high roll 5 and the 2-high roll 6 are installed in the inlet and outlet sides of a mill respectively and the rolls 5, 6 are supported by a common housing 7. Straightening effect is improved because straightening rolling by the roll 6 is succeedingly performed immediately after rolling by the roll 5 in the common housing 7.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a rolling apparatus and a rolling machine that can minimize sheet crown even when a strong rolling blade is added when rolling and welding, for example, composite metal strips. It is about the method.

[Conventional technology and problem 1 For example, composite metal strips such as cladding materials! 11 is most commonly made by rolling and welding. At this time, in order to cold-weld dissimilar metals at once, it is not uncommon for a strong reduction blade with a rolling ratio of 70% or more to be required in one bath.

However, using a normal 4-high rolling mill or 2-high rolling mill,
When the strong reduction blades are loaded as described above, the work rolls 1 and 2 undergo seed deformation and deflection deformation as shown in FIG. The edge drop becomes extremely large at the center level, and may cause so-called edge cracking.Even if it does not reach the level of edge cracking, edge elongation occurs at that part, causing a waveform along the edge of the rolled material. occurs, and stable pressure welding cannot be performed, resulting in quality defects.

In order to avoid the above-mentioned defects, the outer diameter of the reinforcing rolls 3 and 4 near the center is made larger than that near the ends to provide a so-called initial crown. Although efforts have been made to prevent the occurrence of deflection of the parts, under the above-mentioned heavy rolling loads, the initial crown may be prematurely formed due to seizure of the metal strips to the rolls and abrasion of the work rolls. It disappears, and its effect is short-lived.

Therefore, by side-shifting the reinforcing rolls 3 and 4 in the axial direction and by providing the work roll with a bending mechanism that applies bending force toward the center, the occurrence of plate crown and edge elongation of the rolled material can be minimized. Efforts have been made to reduce the amount of radiation, but the entire device must be complicated and precise, and it is unavoidable that the entire device will be extremely expensive due to the need for an automatic rFI7 control device, etc. .

[Object of the Invention] The present invention solves the above-mentioned drawbacks of the prior art, and provides a rolling device and a rolling method that can reduce the occurrence of plate crowns and edge drops to a large rf1 without complicating the rolling device itself. We are trying to provide the following.

[Summary of the Invention] The present invention provides a four-stage roll on the entry side and a two-stage roll on the exit side, supports these by a common housing, and
The gist of this method is to apply forward tension to the rolled material using corrugated rolls, thereby making it possible to easily correct defects that occur in the rolled material during rolling, while also preventing the occurrence of such rolling defects themselves. This makes it possible to prevent this from happening.

[Example] The present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing the specific structure of the rolling apparatus according to the present invention, in which reference numeral 1.2 is a work roll, 3.degree. 4 is a reinforcing roll, and these constitute a four-tiered roll 5. On the other hand, 6 is two rolls 6a.

6b, the four-stage roll 5 is arranged on the input side of rolling, and the second-stage roll 6 is arranged on the exit side of rolling, and these rolls 5 and 6 are supported by a common housing 7. There is.

As mentioned above, there are cases where the 4-stage roll and the 2-stage roll are supported by separate housings and arranged in tandem instead of being supported by the common housing 7. Such a tandem arrangement is The rolled material rolled on the edge of the strong reduction blade with four-stage rolls has slightly different plate crowns on the left and right sides in the rIJ direction. This improves balance in the rolling width direction and improves external shapes such as corrugations.

However, according to the above-mentioned tandem system, the procedure is that after rolling with four-stage rolls, this is once wound up, and then inserted into two-stage rolls. Assuming that the rolling direction of the rolled material 10 by the four-high rolls and the positional relationship of the end elongation 11, waveform 12, etc. are as shown in FIG. 2(a),
When this is inserted into the two-stage roll, the positional relationship is reversed as shown in the figure. Even if the plate is corrected in the reverse direction, it is difficult to improve the balance of the plate crown or the plate shape. Furthermore, if the coil is once taken out and then carried into the second roll and inserted, the processing heat generated in the rolled material during strong reduction rolling with the fourth roll is cooled down, and the material resists deformation during straightening rolling. Since it is corrected only after it has grown considerably, the correction itself is insufficient.

As shown in FIG. 1, the present invention supports a 4-high roll 5 and a 2-high roll 6 in a common housing, rolls the base material 10a and the covering material 10b by the 4-high roll 5, and then rolls the rolled material lO. The reason for constructing it so that it can be straightened immediately by two-stage rolls 6 is to improve the drawbacks of the tandem method described above, and also to make it possible to apply forward tension as described later.

That is, in the rolling apparatus according to the present invention, immediately after rolling by the four-stage rolls 5, the second stage =
The rolling stock is configured to carry out straightening rolling using a rolling mill 6. If straightening rolling is performed in the common housing in this way, firstly, the rolled material 10 generates heat due to processing heat during rolling by the four-high rolls 5, and is immediately rolled while still in a high temperature state. The straightening is performed in a state where the deformation resistance is reduced, and the straightening effect is much greater.Secondly, in the conventional example, since the coil is once taken out and then inserted into the straightening roll, the positional relationship in the width direction is reversed left and right, and the straightening effect is reduced. In contrast, in the present invention, the positional relationship in the [11] direction of the rolled material 10 in the four-high roll 5 and the two-high roll 6 is the same, and this has the special effect of making the straightening effect more effective.

Furthermore, a feature of the present invention is that since the four-stage roll 5 and the two-stage roll 6 are supported within the common housing 7, it is possible to apply forward tension by the two-stage roll 6. That is, the circumferential speed of the two-stage roll 6 is
．． By making the circumferential speed higher than No. 2, tension is generated between the four-stage roll 5 and the second-stage roll 6 in the rolled material 10. When such forward tension T is small or hardly applied, the end elongation formed in the rolled portion 13 during rolling remains as is, and a waveform 12 is formed as shown in FIG. However, as shown in FIG. 3, if the front tension T is sufficiently thick C', the front tension T causes middle elongation in the rolled material 10, which cancels out the edge elongation in the rolling part 13, resulting in uniform deformation. As a result, the corrugations 12 are reduced or eliminated, and a homogeneous rolled material 10 can be obtained.

Therefore, in order to apply forward tension by the two-stage roll 6 as described above, the rolls 6a and 6b need to have a sufficient contact area with the rolled material 10.

From a practical point of view, it is desirable that the diameter of the rolls 6a, 6b is 100 m or more, and if it is less than 100 Ill+, the length of the arc of contact between the rolls and the rolled material will become small. If the length of the contact arc is small in this way, the amount of deformation of the material at the rolling part of the roll increases with the same rolling reduction amount, and the stability deteriorates when shape correcting rolling is performed by adding a large forward tension. . Further, if the roll diameter is small, heat crown is likely to occur, and when the roll is worn out, the rolled material is not affected and the effect acts more sensitively.

In the above embodiments, the rolling welding of composite metal strips has been explained as an example, but it goes without saying that the present invention is equally applicable to the rolling of lit strips.

Example 1 As shown in Fig. 1, the work roll diameter is 1001 il+, the reinforcing roll diameter is 400, and the 4-stage roll and the roll diameter are 60011.
Using a rolling mill according to the present invention in which a two-tiered roll II is provided in a common housing, Fe of 1.0 mm'X150 nm'
-36%Ni alloy strip and 1,0+a'X 150nv
+v Mn-20%CU alloy strips were rolled and welded. At this time, at a rolling rate of 70% with the 4-high roll and 20% with the 2-high roll, the forward tension T is 60% of the yield stress of the composite material.
The plate warpage (curling amount) of the obtained composite material was 30 m in radius of curvature.

This is 1/6 smaller than the curvature radius of 5 m in the conventional tandem rolling method, and the plate shape is also large rl.
The condition improved to J, and no waves were observed.

Example 2 The reinforcing roll of the same rolling mill as in Example 1 was shifted in the axial direction, and a 60 ton bending mechanism was added to the bearing box of the work roll using hydraulic pressure. The reinforcing roll of the 4-high roll was shifted to 10+m inside the rolled material, the rolling rate of the 4-high roll was 70%, the rolling rate of the 2-high roll was 20%, and the front tension was set to 60% of the yield stress of the material as in Example 1. %(42kgr
/id), the same material as in Example 1 was rolled and welded. The curling amount of the obtained composite material was 50 m in radius of curvature, which was 1/1 compared to the conventional example by tandem rolling.
reduced to below 0. In addition, the occurrence of toy, which is warpage in the board r1 direction, is 10 m in radius of curvature, which is 1/3 of the conventional example.
Reduced to below.

[Effect 1 of the Invention As described above, according to the apparatus and rolling method of the present invention, the following excellent effects can be achieved.

(1) For example, in pressure welding of composite materials, curling of a plate shape can be improved to 1/10 or less, and center warpage can be improved to 1/3 or less compared to conventional methods.

(2) It can be simplified to a larger [11] rolling mill than the conventional rolling mill, and it is possible to perform straightening rolling at the same time as rolling rolling with one rolling mill, which is expected to have a particularly large improvement effect on the production of composite metal strips, etc. Can be done.

(3) Curling and center warpage can be stably improved without performing special rolling or strong straightening rolling in a separate process after rolling and welding, which greatly contributes to improving reliability and reducing costs.

(4) Improvement in rolling of difficult-to-work materials with high deformation resistance, as processing heat from strong rolling on the 4th roll side can be used as is, and straightening rolling can be carried out on the 2nd roll side before the temperature drops. Great effect.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the configuration of the rolling device according to the present invention, Fig. 2 is an explanatory diagram showing the relationship between the rolling direction in conventional rolling and the direction of insertion into the straightening rolling mill, and Figs. 3 and 4 are forward views. Explanatory diagram showing the relationship between the magnitude of tension and the plate shape of the rolled material, No. 5
The figure is an explanatory diagram showing the state of roll deformation during strong reduction blade rolling. 1.2 Second industry roll, 3.4: Reinforcement roll, 5: Four-high roll, 6: Two-high roll, 7: Housing, 10: Rolled material. Agent Patent Attorney Fujiyoshi Sato Figure 1 72, tsu, 2. - 11 (I) (・)Ifp
- Figure 3/'tyL side pressure

Claims (2)

[Claims] (1) A rolling device in which a four-stage rolling roll is arranged on the entry side and a two-stage large-diameter roll is arranged on the exit side, and these are supported by a common housing. (2) A rolling method in which a four-stage rolling roll is arranged on the entry side and a two-stage large-diameter roll is arranged on the exit side, and the rolled strip is rolled with forward tension applied by the two-stage large-diameter roll.