JPS6224165B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION To straighten the shape of a strip, a shape straightening machine having a roll arrangement as shown in FIG. 1, which is usually called a tension roll leveler, is used. 1st
The shape correction of the material 1 to be shaped by the shape correction machine shown in the figure is performed as follows. That is, the shape-correcting material 1 is in a state where tension is applied by a tension applying device (not shown) (disposed before and after FIG. 1).
The work rolls 2, 2a, and 2b arranged in a staggered manner as shown in FIG. 1 are sequentially passed through so as to be repeatedly bent. As a result, permanent elongation necessary for shape correction is added to the material 1 to be shaped, correcting shape defects due to partial elongation such as middle elongation and edge elongation, and shape defects such as bending in the width direction and bending in the longitudinal direction. Defects are also corrected at the same time.

Backup rolls 3, 3, 3a, 3a, 3b, 3b are arranged to prevent the work rolls 2, 2a, 2b from bending. Usually, in FIG. 1, the units of work roll 2a and backup roll 3a, deflector roll 4,
5 is fixed, and the work roll 2 and back up roll 3 units, and the work roll 2b and back up roll 3 b units are movable in the direction of the arrow, and this movement changes the amount of bending of the material 1 to be shaped. It is now possible to adjust the
In addition, the deflector rolls 4 and 5 are connected to the work roll 2.
They are arranged to prevent the movement of work roll 2b from directly affecting other work rolls, and if there is no deflector roll 4 in Fig. 1, moving work roll 2b will directly affect work roll 2a. This makes it difficult to adjust the features for shape correction.

As described above, the material to be shaped 1 is shape-corrected by the shape straightening machine as shown in FIG. It is known that the shape correction effect decreases due to variations. That is,
As shown in Figure 2, the material to be shaped has a distribution of mechanical properties (0.2% proof stress or yield point stress is particularly important here) in the width direction (the material has such a distribution of mechanical properties). A typical shape straightening material is a rimmed steel plate, which has a rim layer at both ends in the width direction (the range of b ₁ and b ₂ in Fig. 2 is approximately 100 mm). Even if the shape is corrected using a shape straightening machine, partial elongation (end elongation) remains at both ends as shown in FIG. 3, and it is difficult to correct the shape into a completely flat shape. In other words, in a material to be shaped that has the distribution of mechanical properties as shown in Fig. 2, both ends are softer than the other parts, and even if the width direction is straightened under the same conditions, both ends will be softer than the other ends. The area is easily stretched, and a uniform correction effect cannot be obtained. In Fig. 2, b ₀ is the range where the 0.2% proof stress (or yield point stress) in the strip width direction is relatively uniform, and b ₁ and b ₂ are the ranges where the 0.2% proof stress that occurs at the ends in the strip width direction is large. It shows the range of change.

Therefore, in the conventional shape straightening machine, one or more work rolls 2, 2a, 2b, deflector rolls 4, 5, or a combination of these rolls are used as shown in FIG. _b1 ,
b A measure has been taken to maintain the shape correction effect by performing crowning at the position corresponding to _{the second} part. The reason why the shape correction effect can be maintained by performing this crowning can basically be explained with reference to FIG.
In FIG. 5, D ₁ of the roll 6 indicates the roll diameter of the uncrowned portion, and D ₂ indicates the roll diameter of the crowned portion. Fifth
As is clear from the figure, from roll 7 to roll 6
The process leading to roll 8 through _D1 diameter part and roll 7
Comparing the process from the D2 diameter portion of the roll ₆ to the roll 8, it can be seen that the length of the material 1 to be shaped is passed is longer in the former case. That is, by crowning the roll to reduce the roll diameter, the threading length can be made shorter than other parts. By arbitrarily selecting the location and degree of crowning,
It becomes possible to arbitrarily obtain a tension distribution in the width direction. It is also possible to obtain the distribution of the amount of bending of the material to be shaped by the rolls. Therefore, if the above-mentioned distribution of mechanical properties is considered based on the tension distribution and the bending amount distribution, a uniform straightening effect can be obtained. In addition, in FIG. 5, the relationship between the crowning amount and the threading length can be easily calculated from the geometric relationship.

The above has explained the effect of the crowning roll for the material to be shaped 1 having the distribution of mechanical properties shown in Fig. 2. However, it is difficult to correct the shape and requires a roll that has been crowned in the same way as above. As mentioned above, it is possible to maintain the shape straightening effect by using a roll that has been crowned appropriately for the properties of the shape straightening material 1, but when actually applied, the Since the width dimension, mechanical property distribution amount, and thickness distribution amount of the shape straightening material 1 are variables, it is necessary to prepare many rolls in order to select the roll that has undergone the most suitable crowning. The preparation work is difficult. On the other hand, when selecting rolls, if the above-mentioned properties of the material 1 to be shaped are not accurately understood in advance, it is necessary to actually carry out shape straightening and select an appropriate roll, resulting in large material loss. , resulting in a loss of man-hours. Therefore, in actual shape correction work, rolls are selected based on work standards, and it is unavoidable that some shape defects remain, and it is understood that it cannot be managed otherwise.

The present invention has been proposed to solve the above-mentioned conventional drawbacks, and includes at least two deflector rolls having a diameter larger than that of the work roll or the intermediate roll,
The deflector roll performs crowning on one end of the material to be shaped in the opposite direction, and also performs crowning in the width direction of the material to be shaped, depending on the width dimension of the material to be shaped, the mechanical properties in the width direction, the distribution amount of thickness, etc. It is an object of the present invention to provide a strip forming and straightening machine configured to move independently.

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 6 and 7, a typical roll arrangement when carrying out the present invention is a work roll 9.
Deflector rolls 10 and 11 each having a diameter larger than that of the work roll 9 are arranged on the inlet and outlet sides of the work roll 9, and the deflector rolls 10 and 11 sandwich the material 1 to be shaped and are connected to the work roll 9. placed on the opposite side.

The deflector roll 10 has a crowning 10' at one end, and the deflector roll 11 has a crowning 11' at the end opposite the deflector roll 10. Further, the deflector rolls 10 and 11 are configured to be freely adjustable in movement in the direction of the arrow shown in FIG. 7, that is, in the width direction of the material 1 to be shaped. 12, 12 is the backup roll of the work roll 9. Further, b ₁ ′ is the range where the crowning 10′ of the deflector roll 10 affects the width of the material 1 to be shaped, and b ₂ ′ is the range where the crowning 11′ of the deflector roll 11 affects the width of the material 1 to be shaped. This shows that. The movement of the deflector rolls 10 and 11 is adjusted by known means, such as hydraulic cylinders. Further, the deflector rolls 10 and 11 are rotatably supported by bearing chokes (not shown) attached to bearing portions at both ends, respectively, and the same bearing chokes also move as the deflector rolls move.

Next, to explain the operation of the embodiments shown in FIGS. 6 and 7, crownings 10' and 1
1', the length of sheet passing from the deflector roll 10 to the deflector roll 11 via the work roll 9 can be changed at each part in the width direction. This makes it possible to give any tension distribution in the width direction. This effect is the same as that explained in FIG. 5 above.

On the other hand, the deflector rolls 10, 11 are used for changes in the width dimension of the material 1 to be shaped, changes in the distribution of mechanical properties in the width direction shown in FIG. 2, changes in the thickness distribution in the width direction, etc. By arbitrarily adjusting the movement of the deflector rolls 10 and 11 in the width direction of the shape straightening material 1, the deflector rolls 10 and 11 can be moved while maintaining the above-mentioned action, that is, the action of giving an arbitrary tension distribution in the width direction.
This can be addressed without replacing the . That is, the deflector roll 10 shown in FIG.
The crowning portions 10' and 11' of 11 can freely adjust the dimensions b ₁ ' and b ₂ ' that affect the width of the material 1 to be shaped.

FIG. 8 shows another embodiment. Although FIG. 6 shows a roll arrangement in which deflector rolls 10 and 11 of the present invention are arranged on the inlet and outlet sides of the work roll 9, respectively, FIG. 9
12a and 12a are backup rolls of the work roll 9a, and 12b and 12b are the backup rolls of the work roll 9b.
However, there is no difference in action and effect. In addition, in the roll arrangement of FIG. 8, the deflector rolls 10 and 1 are arranged as shown in the drawing.
1 is desirably placed on the opposite side of the material 1 to be shaped.

The number of deflector rolls of the present invention was explained as two in each of the above embodiments, but two is the minimum number, and the effect of the present invention will not be lost even if there are more than two deflector rolls. do not have. Note that the present invention can be applied not only to shape straightening machines but also to rolling lines, in which case the tension distribution in the width direction of the rolled material is controlled and the thickness reduction that occurs at the ends of the rolled material is controlled. The effect of reducing this can be obtained. The present invention can also be applied to MMC mills (tensioners, roller levelers).

By the way, in FIG. 2, the areas b ₁ and b ₂ where the mechanical properties change greatly are generally softer than other areas, such as the rim layer of a rimmed steel plate. Therefore, in order to uniformly correct the shape of this area like other areas, it is necessary to change the correction conditions. That is, it is necessary to reduce the tension in the range of dimensions b ₁ and b ₂ or to reduce the amount of bending in the range of dimensions b ₁ and b ₂ .

It is clear that according to the invention, since the crowning portions are provided at opposite ends of at least two deflector rolls, the straightening conditions can be varied. i.e. at least 2
With these deflector rolls, the effect of crowning both ends of the roll as shown in FIG. 4 can be directly obtained.

In addition, since the deflector rolls can be individually moved and adjusted in the width direction of the material to be shaped, it is possible to adjust the deflector rolls against changes in the distribution of mechanical properties, thickness distribution, and width dimensions of the material to be shaped. This can also be done without changing the roll. For example, if the b ₁ and b ₂ ranges in Figure 2 change, this can be handled by moving and adjusting the deflector roll so that the b ₁ ' and b ₂ ' dimensions in Figure 7 match the b ₁ and b ₂ dimensions, respectively. can. It is obvious that this movement adjustment can also deal with changes in thickness distribution and width dimension. In addition, it is actually difficult to grasp the distribution of the mechanical properties before the shape correction, and it is also impossible to grasp the distribution of the mechanical properties over the entire length of the material to be shaped. However, according to the present invention, it is possible to arbitrarily and continuously adjust the shape straightening conditions, and it is possible to select appropriate straightening conditions over the entire length of the material to be shaped.

In addition, since the deflector roll of the present invention has a larger diameter than the work roll or intermediate roll, there is no need to reduce the rigidity of the device or make the device complicated, unlike when operating small diameter rolls in conventional devices. There are no drawbacks, and sufficient device rigidity, which is essential for a shape straightening machine, can be ensured, and non-uniformity in thickness in the width direction of the plate due to deflection of the rolling rolls can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a conventional strip shape straightening machine, Fig. 2 is a 0.2% yield strength distribution curve in the width direction of the strip of the material to be shaped, and Fig. 3 is a shape correction target shown in Fig. 2. FIG. 4 is a perspective view showing a part of the material after shape correction; FIG. 4 is a side view showing an example of a roll for shape correction of the material to be shaped shown in FIG. 2;
The figure is an explanatory view showing the shape straightening effect by the rolls in Figure 4, Figure 6 is a front view of a strip shape straightening machine showing an embodiment of the present invention, Figure 7 is a plan view of the same, and Figure 8 is the same as the one shown in Figure 6. FIG. 3 is a front view of a strip shape straightening machine showing a different embodiment from the one shown in FIG. Explanation of main parts of the figure 1...Shape straightening material, 9,
9a, 9b... Work roll, 10, 11... Deflector roll, 10', 11'... Crowning, 1
2, 12a, 12b...backup roll.

Claims (1)

[Claims] 1. In a strip shape straightening machine that straightens the shape by repeatedly bending the material to be shaped under tension to cause permanent elongation, at least two deflector rolls having a diameter larger than the work roll or the intermediate roll are used. The deflector roll performs crowning on one end of the material to be shaped opposite to each other, and also crowns the material to be shaped according to the width dimension of the material to be shaped, the mechanical properties in the width direction, the distribution amount of thickness, etc. A strip shape straightening machine characterized in that the strip shape straightening machine is configured to move independently in the width direction of the strip.