JPH11246098A - Plate width change-control method and device for helical turner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adequately perform change of a plate width in a helical turner without disturbing operation even if a line speed is high, by restraining that becomes maximum in a control process of the floating amount as small as possible. SOLUTION: By setting a cover interval to any intermediate position W0 +G+a between W1 +G and W1 +G between a passing time of an earlier member from a connecting part and a passing time of a later member, effect by rapid variation of floating amount at passing time of the connecting part becomes as small as possible. Because when the connecting part passes through a helical turner the cover interval has been modified at a certain extend, the variation of the floating amount can be restrained. Because maximum floating amount just after changing of a plate width is smaller comparing the case that the cover interval is modified after top of the later material passes, meander can be avoided. Thus, adequate change of the plate width can be performed. Here, W0 and W1 are plate widths (mm) of earlier and later materials, respectively, G is margin (mm), and variable a is (W1 -W0 )/2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, when a plurality of processes are continuously performed on a strip such as a steel strip, and guides the strip in a non-contact manner while floating by a fluid ejected from a cylinder. A width change performed by controlling the interval of the cover in an apparatus for changing the traveling direction of a strip (hereinafter, referred to as a helical turner), which includes a cover that covers fluid jets at both ends in the width direction of the guide surface in a cylindrical body. It relates to a control method and a device.

[0002]

2. Description of the Related Art When a plurality of processes are continuously performed on a strip such as a steel strip, the traveling direction of the strip may be changed between processing apparatuses due to a layout problem of the entire equipment. As a helical turner used in such a case, for example, an apparatus described in JP-A-4-55254 is known.

In this device, as shown in FIGS. 7 and 8, a spiral band-shaped portion is provided on a semicircular peripheral surface of a cylindrical body 1a so as to oppose a band-shaped material surface as a guide surface 2. The fluid introduced into the cylindrical body 1a is ejected from the fluid ejection port 22 toward the surface of the strip material, and the guide surface 2 is used as a traveling passage and the strip material S Is guided in a floating state. Here, the housing 11 is provided on both sides of the guide surface 2.
A side guide 32 integrated with the belt member is provided to stably convey the strip-shaped material.

However, in this method, when the strips are joined and conveyed continuously, especially when the sheet widths before and after the joining portion are different, the maximum sheet width for conveying the side guide 32 is set to the maximum value. It is necessary to set them, and if it is attempted to process a narrow plate in this state, wasteful ejection of fluid occurs on both sides, and the efficiency is reduced. In addition, it can be a hindrance to stable operation.

[0005] Therefore, a method has been proposed for controlling the width of a region where a fluid is actually ejected in a helical turner. Specifically, a cover for closing the fluid is provided in the cylindrical body 1a, the fluid ejection ports at both ends of the guide surface 2 are closed from the inside, and the width of the traveling passage is set to be variable according to the plate width of the belt-shaped body. Is preferred. With this cover, wasteful ejection of fluid from a portion of the guide surface where the strip material does not cover can be eliminated, and efficient operation is possible.

However, the plate thickness is approximately 2.0 mm or less, and the plate width is 50 mm.
If a helical turner with the above-mentioned cover is applied to a thin and wide band-shaped material of 0 mm or more and the position of the cover is set inside the plate width, the blowing of fluid becomes unstable,
The width end portion of the band material vibrates, and if the width end portion is severe, breakage occurs. Therefore, the interval between the covers is generally set to be approximately 5 to 10% wider than the width of the plate.

[0007] The flying height of the strip is generally about 5 mm to 30 mm. If it is less than 5 mm, the danger of contact increases, while if it is more than 30 mm, not only waste of power but also meandering is caused. This meandering is caused by a change in the path of the band-shaped material, which is triggered by a change in kinetic energy at the time of the path change. This change in the path is caused by a change in the flying height of the strip.

[0008]

One of the major problems in stably transporting the strip with the flying height of about 5 mm to 30 mm as described above is that continuous operation is performed by joining strips having different widths. In this case, line transfer is performed. If the transfer speed of the line is low, it can be dealt with simply by changing the cover interval in synchronization with the passage of the strip material through the helical turner. In such a case, it is impossible to follow the line by changing the cover interval with a commonly used electric motor, hydraulic cylinder, or the like.

As a result, there have been problems in that the width end portion of the strip material vibrates when passing through the helical turner at the joint, a contact accident occurs, and the strip material suddenly floats up and meanders. Further, in order to avoid such troubles, it is not practical to reduce the line speed at the time of passing the helical turner at the junction because there is a problem in operation. An object of the present invention is to provide a method and an apparatus for appropriately performing a width change control of a helical turner without hindering operation even at a high line speed.

[0010]

Means for Solving the Problems The present inventors have conducted detailed investigation and analysis of the change in the flying height of the band-shaped material at the plate thickness changing portion and the meandering behavior accompanying the change, and have obtained the following knowledge. (1) The change in flying height changes according to the change in the sheet width difference, especially when the sheet width of the succeeding material is smaller than the sheet width of the preceding material, that is, when the sheet width difference is negative. In addition, when the difference between the plate widths is large, the risk of contact increases. This relationship is shown in FIG. FIG.
The horizontal axis shows the plate width difference, and the vertical axis shows the flying height change amount, and illustrates the relationship between the two. The change in flying height is about ± 10 mm for a change in the sheet width difference of ± 100 mm. (2) The meandering amount largely depends on both the initial floating amount before passing through the plate width changing portion and the floating amount change amount, and the initial floating amount is large, and the meandering amount is large as the floating amount change amount is large. Become. FIG. 6 shows this relationship. FIG. 6 illustrates the relationship between the flying height change amount on the horizontal axis and the meandering amount on the vertical axis, using the initial flying height as a parameter.

In FIG. 6, when the initial flying height is 10 mm, when the flying height change amount changes by +10 mm, the meandering amount is 30 mm. When the flying height change amount changes by −10 mm, the meandering amount becomes 10 mm.
mm. When the initial flying height is 15 mm, the meandering amount is 60 mm when the flying height change amount is changed by +10 mm, and the meandering amount is 25 mm when the flying height change amount is changed by -10 mm.
And when the initial flying height is 20mm, the flying height change amount is + 10mm
When it changes, the meandering amount becomes 100 mm. When the flying height change amount changes by -10 mm, the meandering amount becomes 40 mm. As described above, the meandering amount largely depends on the initial flying height. For this reason, it is desirable to keep the maximum flying height in the process of flying height control as small as possible.

The present inventors have arrived at the present invention as a result of various experiments and studies based on the above findings. The present invention provides a guide surface having a predetermined width in an axial direction around a cylindrical body, which is formed by joining a rear end of a preceding material and a front end of a following material and facing a lower surface of a strip material to be continuously processed. A plurality of injection ports for injecting fluid from the cylindrical body toward the band-shaped member are provided, the band-shaped member is supported in a non-contact state by the fluid ejected from the nozzles, and the traveling direction is changed. In changing the plate width of the strip, the width W of the area where the fluid is ejected by partially closing the ejection port
_k (mm) is set smaller than the width of the _guideway.
This problem has been solved by controlling (mm) to satisfy the following condition. Then, the fluid is ejected with a = (W ₁ −W ₀ ) / 2 at the time of processing the vicinity of the strip material of the preceding material L ₁ m and the following material L ₂ m starting from the strip material joint. It has been found that it is preferable to calculate the width W _k (mm) of the region.

Further, a guide surface is provided at a predetermined width in the axial direction around the cylindrical body so that the rear end of the preceding material and the front end of the following material are joined and opposed to the lower surface of the strip material to be continuously processed. A plurality of ejection ports for ejecting a fluid from the cylinder toward the band-shaped material, supporting the band-shaped material in a non-contact state by the fluid ejected from the ejection ports, and changing its traveling direction. A plate width change control device in a recartana, which partially closes an injection port and injects a fluid in a width W _k
(mm) limiting means for limiting the width smaller than the width of the guide surface, and tracking means for tracking the joint of the strip material,
The object has been solved by controlling W _k (mm) as follows based on the tracking means. Then, at the time of processing the vicinity of the strip material of the preceding material L ₁ m portion and the following material L ₂ m portion starting from the strip material joint, a = (W ₁ −W ₀ ) /
It has been found that it is preferable to calculate the width W _k (mm) of the region where the fluid is ejected as 2.

At the time of the preceding material processing except for the L ₁ m portion from the band-shaped material joint: W _k = W ₀
+ Row material processing time after the G strip member joining portion excluding the L ₂ m unit: W _k = W ₁
+ G Leading material L ₁ (m) and trailing material L ₂ starting from the band-shaped material joint
(M) of the processing _{time: W k = W 0 + G} + a where, a denotes a case _{W 1 -W 0> α, 0} <α <a <(W 1 -
When any value of (W ₀ ), −β ≦ W ₁ −W ₀ ≦ α, a = 0 When W ₁ −W ₀ <−β, (W ₁ −W ₀ ) <a <−β <0 Any value.

W ₀ is the sheet width (mm) of the preceding material. W ₁
It is the board width (mm) of the following material. G is a margin (mm).
L ₁ , L ₂ , α, and β are positive values set in advance.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a helical turner to which the present invention is applied will be described. FIG. 1 is a structural explanatory view of an example of a helical turner to which the present invention is applied. FIG.
FIG. 4 is an explanatory view of the arrangement of a helical turner and a strip. FIG.
FIG. 2 is an explanatory view of a partial cross section of the helical turner shown in FIG. 1.

As shown in these figures, the guide surface 2 which opposes the surface of the strip-shaped material S extends over approximately half the circumference of the housing 11 of the helical turner 1 and is provided at the axial center portion at the same center with respect to this axis. The two spirals are provided with a predetermined width W _A (dimension sufficiently larger than the width Ws of the guided strip-shaped material S) in the axial direction as the width-wise outer line 21. Fluid ejection ports 22 (through holes) are provided at equal intervals on the entire surface of the guide surface 2. Such a guide surface 2 is formed by, for example, forming a portion corresponding to a portion between two outlines 21 of the helical turner 1 with a punching metal.

At both ends in the width direction of the guide surface 2 in the helical turner 1, a curved surface fitted inside the housing 11 is defined as an outer peripheral surface.
A plate-shaped cover 3 is provided in which the outlines at both ends in the width direction are the same as the spiral outline 21 of the guide surface 2. As shown in FIG. 3, the cover 3 closes the ejection ports 22 at both ends in the width direction of the guide surface 2, and sets the width (fluid ejection width) W _k of the area where the fluid is actually ejected to the width of the strip S. Guide surface 2 according to width Ws
Width W _A less) is for the width, for example, a thin plate, after the outer peripheral surface is bent to such a curved surface that is fitted to the housing 11, predetermined by a helical outline 21 It is formed by cutting into a strip of width.

The cover 3 is movable in the axial direction of the cylinder 1a by a hydraulic cylinder 4 having a cylinder portion 4a fixed at a predetermined position in the cylinder 1a. The cylinder portion 4a of the hydraulic cylinder 4 is fixed to, for example, a bracket projecting from the inner surface of the helical turner 1, and the tip of the rod portion 4b is formed at the widthwise end surface of the cover 3 (the end surface opposite to the guide surface).
When the end face is pushed and pulled by the advance and retreat of the hydraulic cylinder 4, the width of the cover 3 covering the guide surface 2 changes.

Further, a fluid is introduced into the helical turner 1 at a predetermined pressure by a fluid introduction device (not shown), and the introduced fluid is ejected from the helical turner 1 by an ejection port.
The air is ejected toward the surface of the band material S through 22. By this ejected fluid, the strip-shaped material S is guided along the guide surface 2 in a floating state from the helical turner 1 and proceeds, so that the traveling direction is changed.

In the helical turner 1, a cover 3 is provided.
Cover position detector 6 for detecting a width-direction end surface position K on the guide surface 2 side of the guide surface 2 at a center portion of the guide surface 2 in the traveling direction of the strip material.
Are provided for the left and right covers 3 respectively.
As the cover position detector 6, for example, an analog position detector having a structure in which the unwinding length of a wire wound in a spiral manner changes with the movement of the cover 3 can be used. When the position sensor 4 is provided with a position sensor, this can be used. Here, the position K (K _L, K _R) is adapted to be detected as distance from the reference point B _R as shown in FIG.

The cover interval control device 7 to which the present invention is applied receives edge position signals from the edge detectors 5L and 5R installed at both ends of the strip-shaped body on the inlet and outlet sides of the helical turner 1. ing. Here, the edge detector 5
Optical sensors are generally used for L and 5R, and each of them is composed of a light projecting unit 5a and a light receiving unit 5b as shown in FIG. 2 (both L and R). Further, the position signal of the above-described cover position detector 6 is also taken into the cover interval control device 7. Then, based on those signals, a tracking signal (not shown) and a setup signal,
Is performed, and control of the cover interval is performed.

The case where the present invention is applied to an actual process line will be described. In an actual line, as a method of detecting the joint of the strip-shaped material, a joint detection hole 40 shown in FIG. 9 is drilled near the joint, and this hole is detected by an optical detector or the like. Will be 10A and 10B are conceptual explanatory diagrams of an example of an actual process line. FIG. 10A is a front view of the process line, and FIG. 10B is a plan view. The joint detector 41 described above is connected to the upstream side 15 of the helical turner 1.
It is located at 0m.

After passing through the joint detector 41, the joint of the strip material reaches the helical turner 1 via the master roll 42 and the steering roll 43. This joint is tracked on the line, and by this tracking, passage of the joint on the helical turner 1 and the preceding material L ₁
The passage of the part (m) and the passage of the following material L ₂ (m) from the joint are detected.

Here, it has been empirically found that it is preferable to set L ₁ and L ₂ to ₁ m to 40 m in a line having a line speed of 30 mpm to 1000 mpm. FIG.
4 is a chart for explaining control when the present invention is applied, and is a chart showing a relationship between a cover position and a flying height. (A) is a chart in the case where the band is changed to be wider, and (b) is a chart in a case where the band is changed to the width.

According to the present invention, the cover interval between W ₀ + G and W ₁ + G between the point of passage of the preceding member L ₁ (m) and the point of passage of the following member L ₂ (m) from the joint is set. W ₀ + G at intermediate position
By setting it to + a, the effect of a sudden change in the flying height when passing through the joint is to be minimized. FIG. 4 showing a case where the band material becomes wider after passing through the joint.
(A) will be described. The cover interval is W ₀ + G during passage of the preceding material. At the point when the preceding material L ₁ (m) passes from the joint, the setting change of the cover interval to W ₀ + G + a is completed. Thereafter, the cover intervals until part following material L ₂ (m) passing the junction is holding, the following material L ₂ (m) unit after passing through a cover interval normal following material W ₁ + G is set Is done.

In this case, when the joint passes through the helical turner, since the cover interval has already been corrected to some extent, the fluctuation of the flying height can be suppressed more than before. In addition, compared to a case where the cover interval is corrected after passing the leading end portion of the trailing material without using the intermediate position, the maximum flying height immediately after the change in the plate width is smaller, so that meandering can be avoided.

The same applies to FIG. 4B in which the width of the strip becomes narrow after passing through the joint. The detailed description is omitted here. In order to prevent this, the maximum flying height is smaller and the meandering is less likely to occur, as compared with the case where the cover interval W ₁ + G of the following material is set in advance in the rear end of the preceding material. The threshold values of the positive numbers α and β are preferably 3% or more, more preferably about 5 to 12%, of the larger width of W ₁ and W ₀ . Sheet width difference W ₁ −
When W ₀ is small, the contribution to the change in the flying height is small, and the danger of causing a contact accident or meandering of the strip is low.
This is because it is not practical to perform the width change control before and after passing through the joint.

However, even in this case, if the width of the succeeding material is smaller than the width of the preceding material, the width of the succeeding material is reduced before the joint passes through the helical turner. If the width is larger than the width, after the joint passes through the helical turner, it is possible to change the width of each sheet,
Useful in preventing contact. Further, the variable a can be simply set to a = (W ₁ −W ₀ ) / 2. In this case, a change in the flying height when changing the plate width can be minimized. However, when the absolute value of the sheet width difference W ₁ −W ₀ is large, that is, when the sheet width difference before and after the joint is large, a
= (W ₁ −W ₀ ) / 2 may not be appropriate.

If the width of the succeeding material is much larger than the width of the preceding material, the lower limit of the flying height target at which the preceding material does not contact the helical turner when W _k = W ₀ + G + a is set (W _k = W ₀ + G + a) For example, it is preferable to adopt a which is about 5 mm).
On the other hand, when the sheet width of the succeeding material is extremely smaller than the sheet width of the preceding material, the upper limit value of the flying height target (for example, 30 mm) at which the preceding material does not increase its meandering when W _k = W ₀ + G + a. (Preferably, about 20 mm).

[0031]

[Example] When a cold-rolled steel sheet having a thickness of 0.15 mm to 0.6 mm and a width of 600 mm to 1300 mm was passed through a process line at a maximum line speed of 800 mpm, the passing state of the helical turner was confirmed. Set flying height of helical turner is 15mm, α = β = 60m
m. The value of a is set to a = (W ₁ −W ₀ ) / 2. L ₁ = L ₂ = 20 m.

Some typical examples of operation are summarized in Table 1.

[0033]

[Table 1]

The operation was carried out under the above conditions, and it was confirmed that the contact of the strip material with the helical turner and the occurrence of meandering were eliminated, and stable conveyance was performed.

[0035]

According to the present invention, it is possible to keep the maximum and minimum values of the fluctuation of the flying height within a proper range with respect to the change in the width of the strip, and to cause a contact accident of the strip with the helical turner and meandering. , It is possible to carry out stable conveyance,
This has greatly contributed to the stabilization of operations. Further, it is possible to optimize the change in the cover interval in response to the change in the plate width of the band-shaped material, which is effective in reducing the fluid supply amount.

[Brief description of the drawings]

FIG. 1 is a structural explanatory view of a helical turner to which the present invention is applied.

FIG. 2 is an explanatory view of an arrangement of a helical turner and a strip.

FIG. 3 is an explanatory view of a partial cross section of the helical turner shown in FIG. 1;

FIGS. 4A and 4B are charts showing the relationship between the cover position and the flying height when the present invention is applied, wherein FIG. 4A is a chart in the case where the width of the band is changed, and FIG. It is a chart in the case of changing to a narrow width.

FIG. 5 is a graph for explaining a relationship between a difference in a sheet width of a strip and a change in a flying height.

FIG. 6 is a graph illustrating a relationship between a change in the flying height of the strip and the meandering amount.

FIG. 7 is a structural explanatory view of a conventional helical turner.

FIG. 8 is an explanatory view of a partial cross section of the helical turner shown in FIG. 7;

FIG. 9 is an explanatory diagram of perforations used for detecting a joint portion of a continuous strip.

FIG. 10 is a conceptual explanatory view of a process line to which the helical turner is applied, (a) is a conceptual front view of the line viewed from the side, and (b) is a conceptual view of the line viewed from above. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Helical turner 1a Cylindrical body 2 Guide surface 3 Cover 4 Hydraulic cylinder 5L, 5R Edge detector 6 Cover position detector 7 Cover interval control device 11 Housing 22 Injection port 32 Side guide 40 Joint detection hole 41 Detector (perforated detector) 42 Master roll 43 Steering roll S Strip material S0 Leading material S1 Trailing material

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaya Toki 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Inside the Chiba Works of Steel Corporation (72) Inventor Tadaaki Octagon 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Inside the Chiba Works

Claims (4)

[Claims] 1. A guide surface is provided with a predetermined width in the axial direction around a cylindrical body to join a rear end of a preceding material and a front end of a succeeding material and face a lower surface of a band-shaped material to be continuously processed. A plurality of ejection ports for ejecting a fluid from the cylinder toward the band-shaped material, supporting the band-shaped material in a non-contact state by the fluid ejected from the ejection ports, and changing its traveling direction. In the recartana, when changing the plate width of the band material, the width W of the area where the fluid is ejected by partially closing the ejection port
_k (mm) is set smaller than the width of the _guideway.
(mm) is controlled so as to satisfy the following condition. At the time of the preceding material processing excluding the L ₁ m portion from the band material joint: W _k = W ₀
+ Row material processing time after the G strip member joining portion excluding the L ₂ m unit: W _k = W ₁
+ G Leading material L ₁ (m) and trailing material L ₂ starting from the band-shaped material joint
(M) of the processing _{time: W k = W 0 + G} + a where, a denotes a case _{W 1 -W 0> α, 0} <α <a <(W 1 -
When any value of (W ₀ ), −β ≦ W ₁ −W ₀ ≦ α, a = 0 When W ₁ −W ₀ <−β, (W ₁ −W ₀ ) <a <−β <0 Any value. W ₀ is the sheet width (mm) of the preceding material. W ₁
It is the board width (mm) of the following material. G is a margin (mm). L
₁ , L ₂ , α, and β are positive values set in advance. 2. The preceding material L ₁ starting from the strip-like material joint portion
(M) and the following material L ₂ (m) during processing, a =
(W ₁ −W ₀ ) / 2, the width W _{k of} the area for ejecting the fluid
2. The method according to claim 1, wherein (mm) is calculated. 3. A guide surface is provided at a predetermined width in the axial direction around a cylindrical body, wherein a guide surface for joining a rear end of a preceding material and a front end of a succeeding material and facing a lower surface of a strip to be continuously processed is provided. A plurality of ejection ports for ejecting a fluid from the cylinder toward the band-shaped material, supporting the band-shaped material in a non-contact state by the fluid ejected from the ejection ports, and changing its traveling direction. A plate width change control device in a recartana,
Limiting means for limiting the width W _k (mm) of the region for injecting the fluid by partially closing the injection port to be smaller than the width of the guide surface, tracking means for tracking a joint of the strip-shaped material, and the tracking means And a control means for controlling W _k (mm) as follows: At the time of the preceding material processing excluding the L ₁ m part from the band material joint: W _k = W ₀
+ Row material processing time after the G strip member joining portion excluding the L ₂ m unit: W _k = W ₁
+ G At the time of processing the preceding material L ₁ m part and the following material L ₂ m part starting from the belt-shaped material joint: W _k = W ₀ + G + a where a is 0 <α when W ₁ −W ₀ > α. <A <(W ₁ −
When any value of (W ₀ ), −β ≦ W ₁ −W ₀ ≦ α, a = 0 When W ₁ −W ₀ <−β, (W ₁ −W ₀ ) <a <−β <0 Any value. W ₀ is the sheet width (mm) of the preceding material. W ₁
It is the board width (mm) of the following material. G is a cover interval allowance (mm) that is a constant value. L ₁ , L ₂ , α, β are
It is a positive constant value. 4. The preceding material L ₁ starting from the strip-like material joining portion
a = (W ₁ −W ₀ ) at the time of processing the m part and the following material L ₂ m part
4. The control device according to claim 3, wherein the width W _k (mm) of the region for injecting the fluid is controlled as / 2.