JPS5987928A - Forming device of cylindrical ring - Google Patents

Abstract

PURPOSE:To limit C warping of a cylindrical body within the range that does not cause impediment for practical use in rewinding a band steel from a coil, bending it by a bending machine and forming into a cylindrical body by a rotary guide ring, by arranging a pay off reel and a rotary guide reel in the same side with the bending machine. CONSTITUTION:A band steel 1 on a pay off reel 2 is rewound and bent by a vertical bending machine 3 to a bent band steel 4 having a specified curvature, and wound on a rotary guide ring 5. When the band steel 4 is wound once on the guide ring 5, it is cut at a position A, hung out from the guide ring, and both ends are welded to manufacture a cylindrical body. In this case, as the generation of C warping in the cylindrical body is unavoidable, the pay off reel 2 and rotary guide reel 5 are arranged in the same side with the bending machine 3. Direction of bending of the band steel when pulling out the band steel is made similar (positive) to the direction of bending when winding on the guide ring 5, and C warping is made small to the degree that does not cause impediment practically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical ring forming apparatus.

When constructing a cylindrical storage tank such as a silo, a bending machine is used on-site to efficiently manufacture the cylindrical ring that makes up the body once at a low cost.1. 811 methods have been published for producing a cylindrical ring containing only one longitudinal weld seam by unwinding the pot coil. The molding device for this daily ring is shown in FIGS. 1 and 2. This consists of a payoff reel 2 on which a copper strip coil 1 is placed, a 30-round type vertical bending machine 3, and a rotation guide ring 5 with a 1" cross section around which a dance I strip 4 formed with several tunes is wound. The center of rotation of the guide ring 5 is determined by a vertical roll 7 which is placed on a horizontal roll 6 and is provided in the opening direction. Then, the steel strip is fed out from the payoff reel 2, bent into a predetermined curvature by a bending machine 3, and wound around a guide ring 5 rotated by a feed roll 8. i A'f song i + tli
When the belt 4 is wrapped once around the guide ring 5 and the predetermined ring length is reached, the molding operation is stopped and the molding operation is performed at a human position. 11 cut curved steel strip 4
4. Extract 11 stitches upward using the upper device and remove from the molding device. And ≦BB10 unwinding O'J! A cylindrical ring containing only one longitudinal weld seam is split by butting the cut ends together and making contact with the I valley.

However, when a cylindrical ring is produced by bending a steel strip using the above-mentioned 30-ru bending machine, the occurrence of C warpage as shown in FIG. 3 is unavoidable. C-curvature is a saddle-shaped bend that appears in a direction perpendicular to the main bending direction during bending. When constructing Leeiro, l'J
The C warp of the fishing ring is 2 yHH from the viewpoint of preventing buckling.
/ Ring width or less is required.

The object of the present invention is to provide a cylindrical ring forming apparatus that can keep the C warp of a cylindrical ring within a practical range.

The inventors conducted various experiments to determine the relationship between the magnitude of C warpage that occurs and the arrangement of components of the molding apparatus. The equipment used in the experiment was a 1/8 scale model, and the coil material was:
5pcc, coil size: t=(1,6~1,5 Jl
l, W== 20 Q (inner diameter 961° outer diameter L8.
0rtts), molding ring diameter: 500-1600 fins. The results of the experiment are shown in Figure 4.

The results of measuring the curvature of a curved copper strip and the resulting C warp show that when the formed curvature radius is large, a large C warp occurs, but when the curvature radius is small, such as in a silo, C shows a tendency for warpage to become smaller.

The reason for this is that if the radius of curvature is small, the ring's 8 [
This is thought to be because the length of the center part of the line and the edge part need to be approximately the same, which reduces C warpage. Furthermore, the degree of C warpage of the ring varies depending on the bending direction. .

That is, the payoff reel 2 and the guide ring 5 are provided on the same side for one bending machine 3, and 61. If the bending direction of the copper strip when unwinding the L and L bands is the same (positive) as the bending direction when winding around the guide ring 5, it would be better to It has been found that the degree of final plastic bending is smaller and the amount of C warp is smaller than when the bending direction is reversed (negative) C2 provided on the opposite side.

This invention was made based on the above knowledge, and the fifth
As shown in the figure, the payoff reel 2 and the rotation guide ring 5 are arranged on the same side with respect to the bending machine 3,
The bending direction of the steel strip when unwinding the copper strip from this equipment arrangement 1'2 is the same as the bending direction when winding around the guide ring 5 (positive)
It is then molded.

Coil material: 8841 depending on the actual machine. Coil dimension: t
-6 ~ 12.7 Tsuru, W = 1800 mm coil was used to conduct a jft experiment, and when the 1 unwinding curvature was negative, 3 ~
5 +; IJII / 1.81TI ll'iW C
Warpage has occurred, but in the positive case θ~2 IILn /
We were able to obtain a cylindrical ring with a width of 1.3 m and no practical problems.

Since the molding apparatus of this invention is as described above, C
A cylindrical ring can be manufactured while keeping the amount of warpage to 6 degrees, which is within practical limits.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional cylindrical ring forming apparatus. Figure 1 is a plan view, Figure 2 is an enlarged perspective view of part 11 in Figure 1, and Figure 3 is an explanation of C warping. 4 are explanatory diagrams showing the relationship between ring curvature and C warpage, and FIG. 5 is an explanatory diagram showing an embodiment of the present invention. 1.°. Copper strip coil - 2.degree. payoff reel, 3. Vertical bending machine, 4. Curved steel strip, 5. Rotating guide ring. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] Wound in a coil? j+! A payoff reel that unwinds a strip, and a vertical bending machine that shapes one unwound steel strip into a curved steel strip having a predetermined curvature. It consists of a rotating guide ring around which a curved steel strip is wound (=
A cylindrical ring forming apparatus characterized in that the payoff reel and the rotation guide ring are arranged at the same position with respect to a bending machine.