JP2003164916A - Deflection correction method for formed product in roll forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deflection correction method for a formed product in a roll forming apparatus which enables smooth correction of deflection occurring in the formed product without necessity for increase in an equipment cost or installation space. <P>SOLUTION: In a roll forming apparatus which forms a channel type formed product passing a long panel type flat steel through a plurality of forming rolls sequentially, the forming rolls 2 among a plurality of the forming rolls decide a width dimension between both upright side parts A1 of the formed product A, while an upper roll 21 of the forming rolls 2 is moved upward or downward to correct a deflection of the formed product. In case a middle portion of the formed product A is convexly deflected, the upper roll 21 is moved upward, and in case a middle portion of the formed product A is concavely deflected, the upper roll 21 is moved downward. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warp straightening method for straightening a warp of a molded product in a roll forming apparatus for molding a long flat steel into a substantially grooved molded product.

[0002]

2. Description of the Related Art Heretofore, there has been provided a roll forming apparatus for forming an approximately groove-shaped formed product by successively passing a long flat steel sheet through a plurality of forming rolls.

A molded product formed by such a roll forming apparatus is apt to be warped due to abrasion of the roll or raw materials. Conventionally, this warp is arranged on the downstream side, for example. A warp straightening device was separately arranged between the forming rolls to correct the warp.

[0004]

However, arranging a warp correction device separately as in the above-mentioned prior art leads to an increase in equipment cost and installation space, and in the case where the thickness of the molded product is changed, the conventional method is required. The warp correction device has a problem that the warp cannot be corrected properly.

The present invention has been made in view of the above problems, and an object of the present invention is to increase a facility cost and an installation space by correcting a warp by utilizing a part of an existing forming roll. It is an object of the present invention to provide a method for straightening the warp of a molded product in a roll forming apparatus, which can smoothly correct the warp of the molded product without causing a problem.

[0006]

According to a first aspect of the present invention, there is provided a method of straightening a warp of a molded product in a roll forming apparatus, wherein a long flat steel sheet is sequentially passed through a plurality of forming rolls to form a substantially grooved product. In the roll forming apparatus for forming the above, among the plurality of forming rolls, the upper roll of the forming roll that determines the width dimension between both end rising pieces of the formed product is moved up and down to correct the warp of the formed product. And

According to the method for straightening a warp of a molded product in the roll forming apparatus of the second aspect of the present invention, the upper roll is raised to raise the upper roll when the middle part of the molded product is warped upward in a convex shape. The upper roll is lowered when the middle portion is warped downward in a concave shape.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view showing a forming roll device.

The forming roll device 1 includes upper and lower rolls 21 and 2.
A plurality of forming rolls 2 made of 2 are arranged in series, and a long flat steel sheet A ′ having a predetermined width is provided in the arrow P direction from the upstream side to the downstream side of the upper and lower rolls 21, 22 of each forming roll 2. The final molded product A having a cross-sectional shape as shown in, for example, FIG. 2 is molded by successively passing through the spaces.

The final molded product A shown in FIG. 2 has a substantially groove-shaped cross section, and in the figure, a so-called gore fold in which the tips of the rising pieces A1 at both ends are bent inward and overlapped. It is made into a shape.

Of the forming rolls 2, the forming roll 2 arranged at the most downstream side in FIG. 1, for example, is provided for determining the width dimension between the both end rising pieces A1 of the final formed product A. Is.

The forming roll 2 is composed of upper and lower rolls 21 and 22 having a front shape as shown in FIG. 3, and by passing between both end flange portions 22a of the lower roll 22,
The width dimension between the both end rising pieces A1 of the final molded product A is set to the set dimension.

That is, in this forming roll 2, the upper roll 21 is not directly contributing to the determination of the width dimension between the rising pieces A1 at both ends but is provided as an auxiliary, and the present invention is provided as an auxiliary. The warp of the final molded product A is corrected by using the upper roll 21.

Here, when the final molded product A is molded by using the above-described roll molding device, abrasion of each roll,
In most cases, a warp occurs in the final molded product A due to the raw material, the change in elongation rate due to the difference in ambient temperature, the difference in thickness, and the like. The roll 21 is used for straightening.

The upper roll 21 is provided to be movable up and down by a moving mechanism (not shown), and the final molded product A
By pushing up and down based on the occurrence state of the warp, the pressing force of the upper roll 21 on the bottom surface of the final molded product A is adjusted, and thereby the warp is corrected.

Specifically, when the intermediate part of the final molded product A is warped upward, the upper roll 21 is raised, and the intermediate part of the final molded product A is concaved downward. When warped, the warp is corrected by lowering the upper roll.

When the upper roll 21 is moved up and down as described above, the operator confirms the warp occurring in the molded final product A, and the operator adjusts the warp based on this. In addition,
Since the degree of occurrence of warpage is generally the same throughout a lot, for example, the operator can correct the warpage by adjusting the amount of movement of the upper roll 21 up and down according to an empirical rule for each lot.

As described above, the existing upper roll 21 provided at the most downstream side is used to correct the warp of the final molded product A, so that the equipment cost and the installation space are not increased.
Moreover, the warp of the final molded product A can be smoothly corrected. In particular, it is effective in correcting the warpage of the final molded product A having a small thickness.

In this embodiment, the forming roll 2 for determining the width dimension between the rising pieces A1 at both ends of the final formed product A is described at the most downstream position. However, the roll forming device may be arranged in front.

[0021]

As described above, according to the method for straightening the warp of a molded product in the roll molding apparatus of the present invention, the molding for determining the width dimension between the rising pieces on both ends of the molded product among a plurality of molding rolls. By straightening the upper roll of the roll to correct the warp of the molded product, it is possible to smoothly correct the warp of the molded product without increasing the equipment cost and installation space.

[Brief description of drawings]

FIG. 1 is a schematic view showing a forming roll device.

FIG. 2 is a perspective view showing the shape of a final molded product.

FIG. 3 is a front view showing a forming roll for correcting warpage.

[Explanation of symbols]

1 roll forming equipment 2 forming rolls 21 upper roll 22 Lower roll A final molded product (molded product)

Claims (2)

[Claims] 1. A roll forming apparatus for forming an approximately groove-shaped molded product by sequentially passing a long flat steel sheet through a plurality of forming rolls, wherein both end rising pieces of the molded product among the plurality of forming rolls. A method for straightening a warp of a molded product in a roll forming apparatus, comprising: moving an upper roll of a molding roll, which determines a width dimension of the space, up and down to correct the warp of the molded product. 2. The upper roll is raised when the intermediate part of the molded product is warped upward in a convex shape, and the upper roll is raised when the intermediate part of the molded product is bent downward in a concave shape. The method for straightening a warp of a molded product in a roll forming apparatus according to claim 1, wherein