JP3488009B2 - Deflector roll equipment for continuous sheet metal processing line with waist break prevention function - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a waist bending prevention function.
Deflector roll set sheet metal continuous processing line having
Equipment , in particular, while applying a predetermined tension to the thin metal plate,
Metal thin plate continuous processing line
The metal thin plate in the
Use a roll with a relatively small diameter that can occur
Of a thin metal plate continuous processing line with a waist bending prevention function.
Regarding deflector roll equipment .

[0002]

2. Description of the Related Art In the present invention, rolls that come into contact with a thin metal plate and change the traveling direction of the thin metal plate out of the plane are collectively referred to as deflector rolls. Such rolls are cold- rolled thin metal plates. Process, pickling process, electric cleaning process, continuous annealing process, tempering process, surface treatment process, leveler process, trim process, etc. are used in almost all metal sheet processing steps, and metal sheet is conveyed in a predetermined direction. In addition to the above, it is used for various purposes such as applying and measuring tension to a thin metal plate, and providing a looper function for adjusting the length of the thin metal plate in the next step. In order to achieve such an object, the deflector roll is often added with a position control function, a load measuring function, etc. By wrapping it, it plays the function of changing the traveling direction of the thin metal plate out of the plane.

In the process of disposing such a deflector roll, there is a flatness defect called a hip break as the most serious quality problem that tends to occur in a thin metal plate as a product. In order to prevent such bending, it is necessary to make the roll diameter of the deflector roll sufficiently large to reduce the bending curvature of the thin metal plate so that the thin metal plate does not enter the plastic deformation area due to bending by the deflector roll. Most effective However, depending on the equipment layout, it may not be possible to make the deflector roll diameter so large. As a technique for preventing the waist from breaking in such a case, Japanese Patent Laid-Open No. Hei 7-06033 is available.
Technology to deploy a roll presser to the outlet side deflector roll has been proposed as 0 and JP 7-096318 JP.

[0004]

In the prior art in which the pressing roll is provided on the deflector roll outlet side, the unsteady deformation occurs when the thin metal plate plastically bent by the deflector roll is bent back on the deflector roll outlet side. That is, although the hip break can be prevented by the pressing roll on the exit side, the hip break occurring on the entrance side of the deflector roll cannot be prevented.

An object of the present invention is to provide a facility for preventing a waist break which occurs at the deflector roll entry side when a deflector roll having a relatively small diameter is used such that a thin metal plate undergoes plastic bending. .

[0006]

[Means for Solving the Problems] Although the cause of waist bending, that is, unsteady bending deformation on the deflector roll entrance side has not been clearly clarified in the past, the research by the present inventors has revealed the following mechanism. It became clear that a waist break occurred on the deflector roll entry side.

Generally, a thin metal plate is conveyed to a deflector roll in a flat state without being subjected to bending deformation, but after contacting the deflector roll, it is naturally bent along the radius of curvature of the deflector roll surface. It will be deformed. At this time, if the diameter of the deflector roll is not sufficiently larger than the plate thickness of the metal thin plate, the metal thin plate is wrapped around the deflector roll while undergoing plastic bending. Such bending deformation occurs at the position where the thin metal plate starts to contact the deflector roll or at the upstream side of that position. This is because after the thin metal plate comes into contact with the deflector roll, the bending of the surface of the deflector roll is constant, so that it is not subjected to new bending deformation. The shape of the thin metal plate on the deflector roll entrance side is not generally ideal as shown in FIG. Figure 9
When the thin metal plate straightly enters the deflector roll as shown in, point A where it starts to contact the deflector roll
Therefore, it is necessary to instantaneously undergo bending deformation along the curvature of the deflector roll surface, but the bending moment that causes such bending deformation is the shape of the metal thin plate as shown in FIG. 9, that is, the tension on the inlet side. It cannot occur in a shape in which the action direction of the is coincident with the tangential direction of the deflector roll at the contact start point A with the deflector roll. This is because the line of tension acting on the metal sheet on the entry side passes through the center of the thickness of the metal sheet on the contact start point A, so the moment arm due to the tension on the entry side is zero, and This is because the moment due to is canceled out by the contact surface pressure between the thin metal plate and the deflector roll, so that the bending moment at the contact start point A becomes zero. Therefore, it can be seen that the entrance side shape as shown in FIG. 9, that is, the shape of the metal thin plate matches the tangent line of the deflector roll is a virtual state in which the bending rigidity of the metal thin plate can be regarded as zero.

Therefore, the actual shape of the thin metal plate on the deflector roll entrance side is such that it gradually undergoes elastic bending deformation upstream of the contact point with the deflector roll, as shown in FIG. 10 (a). For the first time, with such a shape, a moment arm d is generated at a point P for a tension T acting at a distance, and a bending moment M = T · d in the direction along the deflector roll surface is generated. As can be seen from FIG. 10 (a), the moment arm d becomes larger as the metal thin plate approaches the deflector roll, so that the bending moment and bending curvature acting on the metal thin plate also increases as the contact with the deflector roll increases. 10 (a) is subjected to bending deformation corresponding to the shape of the thin metal plate on the entry side. In such a situation, when the diameter of the deflector roll is relatively small with respect to the thickness of the thin metal plate and the tension T is large, the bending stress generated in the thin metal plate due to the bending moment causes contact with the deflector roll. Or, the yield stress of the thin metal plate is exceeded on the upstream side. At this time, when the thin metal plate is a material that exhibits an upper yield point and a lower yield point, the yield stress locally decreases to the lower yield point when the bending stress reaches the upper yield point. As a result, the waist is bent as shown in FIG. Once the waist is bent as shown in FIG. 10B, the contact start point between the metal thin plate and the deflector roll moves to the upstream side, and the shape of the metal thin plate on the entry side changes in the direction toward the deflector roll. As a result, the line of action of the tension T approaches the surface of the deflector roll, and the moment arm and bending moment also decrease. When the metal thin plate further advances, the metal thin plate is wound around the deflector roll without being plastically deformed, so that the contact point with the deflector roll moves to the downstream side as shown in FIG. The shape of the thin plate is again close to the state shown in FIG. As a result, the bending moment acting on the thin metal plate becomes high again near the contact point with the deflector roll, and the waist is bent again as shown in FIG. 10D. By repeating the process described above, hip breaks will occur at regular intervals.

From the above consideration on the waist bending process on the entrance side of the deflector roll, when the waist break occurs on the entrance side, it is understood that the contact start point between the deflector roll and the thin metal plate is periodically moved. . That is, it can be seen that in order to prevent the bending of the waist that occurs on the entry side, it is effective to prevent the movement of the contact start point between the deflector roll and the thin metal plate.

In the metal thin plate continuous processing line of the present invention, in which a metal thin plate is passed through while being subjected to a predetermined tension to continuously perform a predetermined process, the metal thin plate may undergo plastic bending deformation to cause waist bending. In the deflector roll equipment using rolls with a relatively small diameter, the entrance side pass line, which is geometrically uniquely determined when the bending rigidity of the metal sheet is assumed to be zero, that is, the entrance side shape of the metal sheet is the deflector. A pressing roll for pinching the thin metal plate with the deflector roll at the virtual contact point between the entrance pass line and the deflector roll surface when they match the tangent of the roll.
Has the main structure. Due to the presence of the pressing roll, the contact start point between the deflector roll and the thin metal plate is forcibly fixed, and the occurrence of waist bending can be prevented. By fixing the contact start point like this,
The bending deformation along the surface curvature of the deflector roll is applied to the thin metal plate on the downstream side from the contact start point. Book first
In the invention of claim 1, the pressing roll is configured to be movable along the surface of the deflector roll during the passage of the sheet, so that the bending of the waist can be prevented even during unsteady work such as the start of work. Furthermore, in the second invention, a plurality of pressing rolls are provided so that no gap can be formed between the metal thin plate and the deflector roll surface on the downstream side from the contact start point, and in the third invention,
To provide a bending deformation due deflector roll stably and stationary, the presser rolls and flattened structure easily or material than deflector roll, in the fourth aspect
Is given a braking mechanism to the presser roll.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The configuration of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a device according to the present invention.
It is a deflector roll facility, and is running through with a stable tension T.
Shows the situation. A thin metal plate 2 is wound around the deflector roll 1, and the thin metal plate advances in the direction of arrow 3. The pressing roll 4 is an entrance-side pass line that is geometrically uniquely determined when the bending rigidity of the thin metal plate is assumed to be zero.
That is, the metal thin plate 2 is pinched between the deflector roll 1 at the virtual contact point between the entrance side pass line and the deflector roll surface when the shape of the metal thin plate on the inlet side coincides with the tangent line of the deflector roll. With such a configuration, it is possible to prevent the variation of the contact point position between the metal thin plate and the deflector roll as shown in FIG. 10 and prevent the occurrence of waist bending. That is, by pressing the metal thin plate 2 at the virtual contact and forcibly determining the passage position thereof, the shape of the metal thin plate on the entry side up to the pressing roll 4 becomes substantially linear, as shown in FIG. The moment arm shown is almost zero. Therefore, it is possible to avoid the phenomenon that the metal thin plate yields before it comes into contact with the deflector roll, and the metal thin plate 2 becomes
After the contact start point between the deflector roll 1 and
Since it is subjected to plastic bending along the surface shape of the deflector roll, even a material that clearly shows an upper yield point and a lower yield point does not cause waist bending. In the drawings of the present invention,
For the sake of simplicity, the winding angle of the thin metal plate on the deflector roll is set to about 90 °, but it goes without saying that the present invention can be applied to a deflector roll facility of any winding angle.

FIG. 2 shows an example in which the position of the pressing roll 4 is slightly moved to the downstream side in the sheet passing direction 3 of the metal thin plate as compared with the case of FIG. As shown in FIG. 2, the moment arm due to the tension T becomes smaller and the bending stress generated in the metal sheet on the entry side is lower than the upper yield stress of the metal sheet as compared with the case without the pressing roll in FIG. If it is within the range, the pressing roll position may be moved a little more than the virtual contact point. Further, the thin metal plate may move slightly to the upstream side as long as it does not cause plastic deformation. This allowable range varies greatly depending on the yield stress of the thin metal plate, the plate thickness, the deflector roll diameter, the pressing roll diameter, and the tension, but by disposing at least the pressing roll 4, the shape of the metal thin plate on the inlet side is shown in FIG. It is a target of the present invention as long as it is changed from the shape in the case a) in which the pressing roll is not provided, and the thin metal plate is arranged in the range upstream of the pressing roll so as not to cause plastic deformation of bending.

FIG. 3 shows an example in which the pressing roll 4 has a structure and material which are more easily flattened than the deflector roll. In this case, as shown in the drawing, the pressing roll 4 is flattened along the shape of the deflector roll surface, and the contact range with the metal thin plate in the sheet passing direction is also long, so that the contact arc between the pressing roll 4 and the metal thin plate 2 is increased. It becomes possible to stably apply the bending deformation of the curvature along the deflector roll to the thin metal plate 2 within the length, and for example, for a thin metal plate which is apt to have a large bending difference between the upper yield stress and the lower yield stress. Also, it becomes possible to completely prevent the occurrence of a waist bend. As a specific structure of the press roll 4 in this case, for example, a resin-based material such as rubber or plastic is used for the press roll surface, or a honeycomb structure or the like is used near the press roll surface.

In the present invention, the pressing roll is provided with a device capable of moving up and down so as to give a required pressing force in the vicinity of the virtual contact point by moving up and down. In addition, the pressing roll has a structure that can be moved along the line direction,
It is preferable to be able to follow the movement of the virtual contact. The pressing roll may be non-driven and may be made to follow the conveying speed of the steel sheet by a pressing force.However, the pressing roll is also provided with a drive device to control the rotation of the roll so as to synchronize with the conveying speed of the steel sheet. May be.

The embodiments described so far can be applied regardless of whether the deflector roll 1 and the press roll 2 are driven, but in FIG.
An example is shown in which a drive device (not shown) for transporting the thin metal plate 2 in the sheet passing direction 3 is provided on the deflector roll 1, and a braking device (not shown) is provided on the pressing roll 4. In this case, the torque acting from the deflector roll is in the direction of arrow 9, and the torque acting in the direction of arrow 10 is from the press roll. As a result, as shown in FIG.
The maximum tension of the tension acting on the downstream side is the tension T ₁ on the downstream side in the vicinity of the pressing roll 4, and the thin metal plate 2 is prevented from being lifted from the deflector roll 1 at this portion, so that
And it becomes possible to give a bending deformation stably. In the case of the deflector roll equipment of the present invention, it is the downstream side in the vicinity of the pressing roll 4 that imparts plastic deformation of bending to the thin metal plate 2. If the tension applied to the thin metal plate 2 on the downstream side is small, the thin metal plate 2 may be lifted from the deflector roll and cause a waist break. On the other hand, as shown in FIG. 4 of the present invention, the deflector roll 1 is illustrated. A non-illustrated braking device is provided on the press roll 4 as a drive device that does not operate, and increasing the tension on the downstream side in the vicinity of the press roll 4 is an extremely effective waist break prevention means.

In FIG. 5, the position of the pressing point between the pressing roll 4 and the deflector roll 1 is geometrically uniquely determined when the bending rigidity of the thin metal plate 2 is assumed to be zero. An example in which the pressing roll 4 is configured to be movable along the surface of the deflector roll 1 so as to include a virtual contact point with the roll and can be continuously changed at least to the downstream side is shown. In this deflector roll facility, for example, at the time of the initial line start, the pressing roll 4 is located at the position B, that is, at the downstream side of the virtual contact point A in the sheet passing direction, and after the tension is sufficiently increased, the virtual roll is set. The pressing roll 4 is gradually moved to the position A so as to bring the pinching point closer to the contact point A. Normally, the tension is not stable enough at the start of the line, so the tension may drop significantly. In such a case, the thin metal plate 2 may float up from the deflector roll 1 on the downstream side of the pressing roll, and a waist break may occur. In such a case, it is necessary to position the pressing roll sufficiently downstream side. It is possible to prevent the metal thin plate 2 from rising from the deflector roll 1, and after the tension is stabilized, move the pressing roll 4 to the virtual contact point A to bend the waist including the line start where the tension is unstable. Can be completely prevented. In addition, even when the line is not started, the thin metal plate 2 may float up from the deflector roll 1 on the downstream side of the pressing roll 4 due to some cause such as poor tension control accuracy, and the waist break may occur. By moving the pressing roll to the downstream side to remove the slack of the thin metal plate and then returning the pressing roll to the original position, it is possible to remove the waist break without stopping the line. Further, such a pressing roll 4 has a structure / material which is more easily flattened than the deflector roll as shown in FIG. 3, or as shown in FIG. 4, the deflector roll 1 has a driving device and the pressing roll 4 has a braking device. By doing so, it is possible to further enhance the hip breaking prevention effect.

FIG. 6 shows a deflector roll 1 and a thin metal plate 2 in addition to the pressing roll positioned at the virtual contact point on the entrance side.
The example which provided another press roll in the contact arc AC with is shown. As described above, by pressing the metal thin plate 2 against the deflector roll within the contact arc between the deflector roll 1 and the metal thin plate 2, it is possible to prevent the occurrence of slip between the deflector roll 1 and the metal thin plate 2. As a result, it is possible to prevent the metal thin plate 2 from rising from the deflector roll 1 at the place where the metal thin plate on the downstream side of the press roll 4 begins to undergo plastic bending, and to prevent the waist from breaking. Further, the pressing roll 4 in FIG. 6 adopts a structure / material that is easier to flatten than the deflector roll as shown in FIG. 3, or the deflector roll 1 is provided with a driving device and the pressing roll 4 is provided with a braking device as shown in FIG. By doing so, it is possible to further enhance the hip breaking prevention effect.

The present invention relates to a technique for preventing hip breakage on the deflector roll entrance side, but it can also be made into a comprehensive hip bend preventive technology by combining the known waist break preventive techniques on the deflector roll exit side. . For example, in FIG.
The combination of the art and the present invention to provide a roll 7 pressing the deflector roll exit side disclosed in 0330, JP-8, a plurality of pressing the outlet side deflector roll as disclosed in JP-A-7-096318 An example will be shown in which the present invention is combined with the technique of providing the pressing roll facility 8 including rolls. That is, in the equipment of FIG. 7, the bending of the waist generated on the entrance side is prevented by the action of the pressing roll 4 on the entrance side of the present invention, and the bending of the waist generated on the exit side is prevented by the action of the pressing roll 7 on the exit side. In the equipment of FIG. 8, the bending of the waist generated on the entrance side is prevented by the action of the pressing roll 4 on the entrance side of the present invention, and the bending of the waist generated on the exit side is prevented by the action of the pressing roll equipment 8 on the exit side.

[0019]

EFFECTS OF THE INVENTION By using the deflector roll equipment of the present invention, it is possible to prevent the metal thin plate from waviness and waist bending even when the metal thin plate is passed through using a deflector roll having a relatively small diameter. In the case of new equipment, it is possible to make it extremely compact and inexpensive, and for existing equipment, the maximum value of the plate thickness that can be passed without causing quality defects is dramatically It becomes possible to raise it to.

[Brief description of drawings]

FIG. 1 is a diagram showing a preferred embodiment of a deflector roll facility of the present invention.

FIG. 2 is a diagram illustrating an allowable range of a pressing roll position according to the present invention.

FIG. 3 is a view showing another preferred embodiment of the deflector roll equipment of the present invention.

FIG. 4 is a view showing another preferred embodiment of the deflector roll equipment of the present invention.

FIG. 5 illustrates the operation effect of the press roll of the present invention .
Fig.

FIG. 6 is a view showing another preferred embodiment of the deflector roll equipment of the present invention.

FIG. 7 is a view showing an embodiment in which the deflector roll equipment of the present invention is combined with a known equipment for preventing hip breakage occurring on the exit side of the deflector roll.

FIG. 8 is a diagram showing an embodiment in which the deflector roll equipment of the present invention is combined with a known equipment for preventing a waist break that occurs on the deflector roll exit side.

FIG. 9 is a view showing a virtual shape of a metal thin plate passing through a deflector roll portion.

FIG. 10 is a diagram showing a waist bending occurrence mechanism on the deflector roll entry side, wherein (a) shows a state of a bending moment acting on the thin metal plate on the deflector roll entry side, and (b), (c), (d). [Fig. 3] is a diagram showing a state where waist bending occurs in a thin metal plate at a deflector roll contact portion.

[Explanation of symbols]

1 ... Deflector roll 2 ... Thin metal plate 3 ... Metal thin plate traveling direction 4 Pressing roll 5 ... Virtual position of pressing roll 6 ... Press roll 7 ... Delivery side roll 8 ... Delivery side press roll equipment 9 ... Deflector roll drive direction (torque acting direction) 10 ... Direction of torque acting from the pressing roll

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-141322 (JP, A) JP-A-4-89135 (JP, A) Actual opening 55-55208 (JP, U) Actual opening 4- 98306 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21B 39/20 B21C 45/00-49/00 C21D 9/56

Claims (4)

(57) [Claims] 1. A metal thin plate continuous processing line in which a metal thin plate is continuously passed through a predetermined process by applying a predetermined tension to the metal thin plate, and the metal thin plate is subjected to plastic bending deformation to cause bending at the waist. In a deflector roll facility using a roll having a small diameter, it has a pressing roll that clamps the thin metal plate between the deflector roll, and the position of the clamping point is assumed to have a bending rigidity of the thin metal plate of zero. The pressing roll is provided such that it includes a virtual contact point between the entrance path line, which is geometrically uniquely determined, and the surface of the deflector roll, and can be continuously changed at least downstream during the threading. A deflector roll facility for a metal thin plate continuous processing line having a waist bending prevention function configured to be movable along a deflector roll surface into a strip. 2. The pressing roll, further comprising at least one pressing roll located on the downstream side of the pressing roll for pinching the thin metal plate in a contact arc between the thin metal plate and the deflector roll. The deflector roll equipment of the metal thin plate continuous processing line having the waist bending prevention function according to claim 1 . 3. The waist break prevention according to claim 1 or 2, wherein the pressing roll surface for pinching the thin metal plate between the deflecting roll and the deflector roll has a structure / material that is more easily flattened than the deflector roll. Deflector roll equipment for continuous processing of thin metal plates with functions. Wherein the deflector roll has a drive for conveying the sheet metal in the traveling direction, and having a brake mechanism metal thin plate presser rolls nipping between the deflector roll according Item 1 or 2
Deflector roll equipment for metal thin plate continuous processing line that has a waist bending prevention function.