JPH06340356A - Winder of strip body and method thereof - Google Patents

Abstract

PURPOSE:To prevent any winding quality defect such as flaws on a roll material, winding looseness, overtightness or the like from occurring as well as to reduce the extent of equipment failure by providing plural pieces of nozzles for air suction in the inner direction of a mandrel. CONSTITUTION:In a mandrel 5 wound with a strip body, plural pieces of nozzles 4 for air suction are provided in the inner direction of this mandrel 5. In this constitution, this mandrel consists of a segment 3 with these suction nozzles 4 and a turning shaft 2. When the strip body 1 is wound up, a tip part of this strip body 1 is sucked to a peripheral surface of the mandrel 5 by means of vacuum suction while being made up of the first wind of the tip part of the strip body 1 from the start of winding operation in advance. Subsequently, the winding operation on and after the second wind is carried out without the vacuum suction, and when a coil of the strip body 1 is pulled out, a pressure fluid is made so as to be blown out of the peripheral surface of the mandrel 5. With this constitution, integral winding quality is thus improvable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding device and a winding method for a strip such as a steel plate.

[0002]

2. Description of the Related Art A conventional winding technique will be described with reference to FIG.
The winding operation of the strip-shaped winding material 1 such as a steel plate is performed by a winding device configured by a mandrel 5 for winding the strip-shaped material and a plurality of trumpet rolls 6 arranged around the mandrel. While holding the tip end portion of No. 1 in an arc shape as much as possible by a device such as a trumpet roll 6 or an arc-shaped apron 7, guide the mandrel 5 along the circumference of the mandrel 5.
And the leading end is pressed by the next winding of the band-shaped body winding material 1 and becomes the second winding, by back tension caused by being restrained by the rolling mill or pinch rolls at the rear. The winding is continued by being tightened (Japanese Patent Publication No. 59-118226). Mandrel 5 in Japanese Examined Patent Publication No. 60-55418
There has been proposed a device for ejecting a pressure fluid from a plurality of arc-shaped aprons 7 arranged on the outer periphery of the.

[0003]

However, in the method of Japanese Patent Publication No. 59-118226 described above, a plurality of trumpet rolls and aprons are arranged, but the winding material of the band-shaped body is entirely covered in the outer peripheral surface direction of the mandrel. It is difficult to keep the winding material of the band-shaped body in an arc shape around the mandrel because it is difficult to hold it due to dimensional restrictions, and this tendency is further increased due to abrasion of the trumpet roll, mandrel, etc. This causes problems such as insufficient winding force and defective winding of a strip-shaped body such as a steel plate. In addition, this winding failure causes an impact force to act on the mandrel when the second winding of the winding material is tightened, which causes equipment troubles, resulting in problems such as winding quality defects and increased equipment maintenance costs. Is being generated.

After the winding operation is completed, the outer diameter of the mandrel is shrunk to extract the coil. At this time, due to the adhesive force of the cooling water or rolling oil adhering to the outer peripheral surface of the mandrel and the coil surface, The inner surface of the tip of the coil sticks to the outer peripheral surface of the mandrel, which makes it difficult to remove the coil.

Further, in Japanese Patent Publication No. 60-55418, a fluid film is formed between the winding material and the outer peripheral surface of the mandrel due to the jetted pressure fluid, which causes a phenomenon such as slip between the winding material and the mandrel. However, the same problems as the winding quality defects as described above will occur. On the other hand, an object of the present invention is to provide a winding device and a winding method that are excellent in the winding property of a strip such as a steel plate.

[0006]

SUMMARY OF THE INVENTION The present invention has the following features in order to achieve the above object. (1) A mandrel for winding a band-shaped body is characterized by having a plurality of air suction nozzles inward of the mandrel. (2) In the winding operation of a strip-shaped body such as a steel plate, while the tip of the strip-shaped body is guided in an arc shape around the mandrel by a device such as a trumpet roll or an apron, the mandrel outer periphery is formed. By sucking air from the surface toward the inner surface of the mandrel, the tip of the band is adsorbed to the outer surface of the mandrel and rotated according to the rotation of the mandrel. Do the winding work as it is, and after finishing the winding work,
It is characterized in that the coil can be easily extracted by blowing out air.

[0007]

FIG. 3 shows a schematic side view of the force acting on the strip-shaped winding material. The strip in the present invention is, for example, a ferrous metal ribbon such as a hot rolled coil or a cold rolled coil of a steel sheet, or a non-ferrous metal ribbon such as a foil, an amorphous or aluminum foil, and a plastic material such as paper, cloth or film. Targets non-metallic ribbons such as resin.

The external force that moves during the winding operation of the winding material 1 acts on the material 10 when it is rotated and wound, and the spring force 10 due to the bending rigidity of the material, its own weight 9 which acts according to the posture of winding. The centrifugal force is 8. Then, the air suction condition in the mandrel is set as follows so that the suction force 11 equal to or larger than the total force of the external forces acting on the leading end of the winding material can be secured only while the first winding of the winding of the strip is formed. Set like.

That is, in the action diagram of force shown in FIG.
The spring force 10 based on the bending rigidity of the winding material 1 is given by the following formula. F ₁ = h ³ × w × E × δ / (4 × L ³ ) ………………………… [1] F ₁ : Bending rigidity spring force [kg] h: Winding material Thickness [mm] w: Width of winding material [mm] E: Longitudinal elastic modulus [kg / mm ² ] L: Length of unsupported end of winding material [mm] δ: Outer surface of mandrel and apron Gap between [mm]

Further, the self-weight 9 when the winding material 1 is below the mandrel 5 is obtained by the following equation. W = h × L × w × γ ………………………… [2] W: Weight of winding material [kg] γ: Specific gravity of winding material [kg / mm ³ ] Furthermore, winding material The centrifugal force 8 acting on 1 is given by the following equation. F ₂ = (W / g) × v ² / R …………………… [3] F ₂ : Centrifugal force acting on the winding material [kg] g: Gravitational acceleration [m / s ² ] R : Mandrel radius [m] v: Winding speed [m / s]

Eventually, when the acting directions of these forces overlap, the resultant force exerted on the winding material 1 becomes maximum, which is expressed by the following equation. F = F ₁ + F ₂ + W ………………………… [4] F: Combined force of the forces that the winding material receives outward in the direction of rotation [k
g] Therefore, by setting the suction pressure 11 for adsorbing the winding material 1 according to the present invention as in the following formula, the winding material 1
However, it is possible to secure a proper state in which the mandrel 5 is in close contact with the outer surface from the position 1 '. p ≧ F / S ………………………… [5] p: Suction pressure required to adsorb the winding material [mmHg] S: Total nozzle opening area [mm ² ]

Regarding the air blowing method after the winding operation, the pressure is set so as to cut the water film or oil film attached to the outer peripheral surface of the mandrel 5 and the inner surface of the first winding of the winding material 1. As a result, the inside of the first winding inner surface of the winding material 1 and the outer peripheral surface of the mandrel 5 can be easily separated.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a mandrel 5 composed of a segment 3 having a suction nozzle 4 for suction and a rotary shaft 2.
FIG. 3 is a cross-sectional view of a device, which is an example of implementation correspondence. 2 shows a vertical cross-sectional view of the XX field of view of FIG. As winding work,
From the outer peripheral surface of the segment 3 toward the inside, from the nozzle 4 provided on the outer surface of the segment 3 which is one of the components of the mandrel 5 until the first winding of the distal end portion 1 of the band-shaped body is formed. Aspirate the air.

That is, the outer surface nozzle 4 of the segment 3
Is connected by a hose 16 between a fluid passage provided inside the segment 3 and a fluid passage provided inside the rotary shaft 2 that is mechanically fastened to the segment 3. Air is sucked by an external suction device as shown in FIG. 1 through the rotary joint 15 at the end and the switching bubble 14.

Further, at this time, the tip end of the strip-shaped winding material 1 is wound according to the rotation of the mandrel 5 while being attracted to the outer peripheral surface of the mandrel. When the second and subsequent windings of the front end of the winding material 1 are ready to be wound, the air suction is stopped and the ordinary winding operation is performed.

After completion of the winding operation, the switching valve 14 is switched through the rotary joint 15 at the end of the rotary shaft 2 connected to the nozzle 4 of the segment 3 in the reverse order to the above, and then connected to the outside. In the blowing device, by blowing a pressure fluid such as air to cut the water film and oil film adhering to the outer surface of the mandrel and the coil surface,
Take out the coil.

A specific example of this embodiment will be described in Table 1 below.

[0018]

[Table 1]

The results of applying the present invention to the winding of hot-rolled steel sheet are shown in Table 2. Compared with the prior art, the effects of reducing the defect rate of winding quality defects and lowering the cost of maintenance can be obtained. Was obtained.

[0020]

[Table 2]

In the present embodiment, the suction nozzle has been described as an example in which the nozzle has a small hole shape and is regularly arranged. However, the present invention is not limited to this, and the slit nozzle and the arrangement are also irregular. The same effect can be obtained even when the mandrel is centrally arranged in accordance with the minimum arrangement width of the winding material or the minimum width of the winding material.

[0022]

EFFECTS OF THE INVENTION By applying the present invention, loosening
Prevents winding defects such as tightness and flaws in the winding material, and
By alleviating the impact force acting on the second winding, the equipment trouble can be reduced and the winding quality can be improved overall.

[Brief description of drawings]

FIG. 1 is a sectional view of a mandrel having a suction nozzle for suction according to the present invention.

FIG. 2 is a vertical cross-sectional view taken along the line XX of FIG.

FIG. 3 is an explanatory view of an external force acting on the winding material.

FIG. 4 is an overall view of a conventional winding device.

[Explanation of symbols]

 1 Winding material for strips such as steel plates 1'Improper state where the material is separated from the segment 2 Rotating shaft 3 Segment 4 Suction nozzle 5 Mandrel 6 Rapper roll 7 Apron 8 Centrifugal force acting during strip winding operation 9 Self-weight of band 10 Flexural rigidity of band 11 Suction force applied to band 12 Suction device 13 Blowing device 14 Switching valve 15 Rotary joint 16 Hose

Claims (2)

[Claims] 1. A winding device for a belt-shaped body, comprising a plurality of nozzles for sucking air inward of a mandrel. 2. When winding the band-shaped body, the tip of the band-shaped body is vacuum-sucked to the outer peripheral surface of the mandrel while the first winding of the tip of the band-shaped body is formed from the start of the winding operation in advance. The method for winding a strip-shaped body is characterized in that the second winding and subsequent windings are performed without suction, and a pressure fluid is blown from the outer peripheral surface of the mandrel when the coil of the strip is extracted.