JPH05154555A - Method for straightening shape of light gage h shape steel - Google Patents

Abstract

PURPOSE:To provide the shape straightening method which can easily and exactly correct the twisted deform of light gage H shaped steel, makes the straightening device of a simple structure and straightens without stopping the manufacturing line. CONSTITUTION:When flanges of H shape steel 2 are pressed at the same positions by clamping from upper and lower with outer rolls and two inner rolls arranged at both sides by clamping webs 7 of H shape steel 2, the contacting position to the flange 5 of the one hand side inner roll 10 contacting with one hand side flange 5 is placed to the position slightly moved to the fore or rear direction by the prescribed distance against the advancing direction of the H shape steel from the contacting position of the outer rolls 6. The warp deforming force to the opposite direction to the direction of twist deforming generated at the H shaped steel is applied to this flange 5 without stopping the manufacturing line of the H shape steel by moving the abutting position of one hand side inner rolls 10 and changing the pulling force applied to the upper and lower surfaces of flange 5 as the abutting side of this inner rolls 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straightening method for improving the shape of torsional deformation generated in H-section steel in the manufacturing process of lightweight H-section steel.

[0002]

Prior Art and Problems to be Solved by the Invention
As a conventional correction method of this kind, as shown in FIG.
The upper outer roll 21 is in contact with the upper end surface of the upper flange 20 of the section steel, the lower outer roll 23 is in contact with the lower end surface of the lower flange 22 and the web 24 of the H section steel is disposed at both sides of the web 24. The two inner rolls 25 and 26, which are in contact with the lower end surface of the upper flange 20, and the web 24 of the H-shaped steel, are arranged at both sides of the web 24 and are in contact with the upper end surface of the lower flange 22. With the two inner rolls 27 and 28, the upper and lower flanges
It is known to reduce 20 and 22. Incidentally, the bending deformation is by the operation of the rolling force between the inner roll 25 and the inner roll 27, the warp deformation is the operation of the rolling force between the inner roll 27 and the inner roll 28, and the twisting deformation is the inner roll 25 which is diagonally opposed to each other. 28 and the inner rolls 26 and 27 that are diagonally opposed to each other are corrected by a pressing force operation.

However, this conventional twist straightening method can reduce the amount of twist deformation, but cannot completely correct the twist deformation. Further, when correcting the shape of the shape steel which is bent and twisted, the twisting becomes large by correcting the bending. Further, correcting the twisting deformation may cause bending deformation and warping deformation.

As described above, when two or more shape defects occur, the shape defects cannot be solved unless the torsional deformation is completely corrected. Further, by correcting the twisting deformation of the H-section steel, bending deformation and warping deformation may newly appear. In other words, bending and warping deformation in shaped steel are simple shape defects in one direction, but if twisting deformation is included there, the shape defect becomes complicated and it is very difficult to improve the shape of shaped steel. become.

Therefore, conventionally, there has been a demand for a correction method capable of producing a state in which the twisting deformation is completely corrected and then correcting the bending and warping deformations.

Therefore, the applicant first determined that the contact position of the inner roll on one side, which was in contact with the one flange, with respect to the flange, was a predetermined distance from the contact position of the outer roll in the front-rear direction with respect to the H-section steel traveling direction. As a position shifted only, by changing the tensile force applied to the upper and lower surfaces of the flange, which is the inner side of the roll,
A warping deformation force is applied to this flange in a direction opposite to the torsional deformation direction generated in the H-section steel. Then, by applying a warping deformation force to the flange with which the one-side inner roll is in contact, the deformation force is positively applied in the direction opposite to the torsion deformation direction, thereby eliminating the torsion deformation of the H-section steel (special feature Wish
3-12298)) is proposed.

When this twist straightening method is applied to a production line and a twist occurs, the production line is stopped, the rolling force of the inner roll is released to "0", and then an appropriate amount is applied in the line direction ( Operation to shift in H-section steel traveling direction)
It is carried out every time a twist occurs. In order to secure the proper shift amount at this time, as shown in FIG.
A liner 31 having a thickness suitable for the shift amount of 30 is incorporated in the left and right gap 34 between the inner roll housing 32 and the correction device main body 33. Reference numeral 35 in FIG. 7 denotes a rolling down device for the inner roll 30.

However, in the correction operation when a twist occurs, first, the manufacturing line is always stopped and the rolling force is released to "0". After that, liners having appropriate thicknesses are installed in the left and right gaps 34 between the inner roll housing 32 and the straightening device main body 33. And with the reduction force restored,
This is done by operating the production line.

Therefore, the manufacturing line must be stopped during the series of straightening operations, and the method proposed by the applicant can eliminate the twisting deformation of the H-section steel.
There was a problem that led to a decrease in the line utilization rate.

The present invention was devised in view of the above-mentioned circumstances, and the object thereof is to make it possible to make the straightening device have a simple structure, and to twist the lightening H-section steel during the straightening operation, that is, during the production line operation. It is an object of the present invention to provide a method for correcting the shape of a lightweight H-section steel that can easily and completely correct the deformation.

[0011]

According to the present invention, the abutting position of the inner roll on one side, which abuts on one flange of the H-section steel, to the flange from the abutting position of the outer roll to H
By arranging the position so as to be displaced by a predetermined distance in the front-rear direction with respect to the traveling direction of the shaped steel, the tensile force applied to the upper and lower surfaces of the flange on the side where the inner roll is in contact is changed, and H A straightening method that applies a warping deformation force in a direction opposite to the torsional deformation direction that has occurred in shaped steel is
It can be done while the section steel production line is in operation.

The movement of the straightening inner roll according to the present invention is performed by moving the inner roll housing 14 as shown in FIG.
An appropriate gap portion 19 is provided between (movable) and the straightening device main body 12 (fixed), and the roll housing 14 of the straightening inner roll 10 is separated from the left and right straightening device main bodies 12 by the amount of the left and right gap portions 19. The inner roll 10 can be moved even during operation, and the position of the inner roll 10 can be adjusted.

As a result, by applying a warping deformation force to the flange with which the inner roll on one side is in contact, the deformation force is positively applied in the direction opposite to the direction of torsional deformation, and the twist of the H-section steel is twisted. Eliminate the deformation.

[0014]

The method for correcting the shape of the lightweight H-section steel according to the present invention will be described below with reference to the illustrated embodiments.

First, the straightening device for carrying out the method for straightening the shape of the lightweight H-section steel according to the present invention will be described. The straightening device 1 (see FIGS. 2 to 4) has the H-section steel 2 after the H-section steel manufacturing process.
Of the upper flange 3 in contact with the upper end surface of the upper flange 3, the lower outer roll 6 in contact with the lower end surface of the lower flange 5, and the web 7 of the H-section steel 2 at both positions. And the two inner rolls 8 and 9 which are in contact with the lower end surface of the upper flange 3 and the both sides of the H-shaped steel 2 with the web 7 interposed therebetween, and the upper end surface of the lower flange 5. It is provided with two inner rolls 10 and 11 which are in contact with each other.

The inner rolls 8 and 9 and the inner rolls 10 and 11 are movable in the front-rear direction with respect to the traveling direction of the H-shaped steel 2 by a predetermined distance a.

The movement of the predetermined distance a (see FIG. 1) allows the inner roll housing 14 (movable) and the straightening device body 12 to be moved.
An appropriate gap portion 19 is provided between the roll housing 14 of the inner straightening roll 10 (in the case of FIG. 1) and the right and left straightening device main bodies 12 by the amount of the left and right gap portions 19. Therefore, it is possible even during operation of the production line.

A moving device A for moving the inner roll 10 by a predetermined distance a is fixed by a screw shaft fixing plate 13 attached to a straightening device body 12 as shown in FIG. Adjusting screw 15 for moving to
And a housing moving plate 17 attached to the roll housing 14 of the inner roll 10 and having a through hole 16 for the adjusting screw 15, and a state in which the housing moving plate 17 is sandwiched from the left and right sides. It consists of housing moving adjustment nuts 18, 18, which are screwed onto the screw 15.

When twist occurs in the welded H-section steel during operation of the production line, both adjusting nuts 18 and 18 are appropriately turned so that the twist state can be corrected, and the inner roll housing 14 is moved to the right and left by an appropriate amount (distance). a) Move. afterwards,
When the twist straightening is completed by the above operation, the adjusting nut 1 so that the inner roll housing 14 does not move left and right.
The housing moving plate 17 is sandwiched between 8 and 18 and fixed.

As described above, the straightening device 1 includes the inner rolls 8, 9 and the inner rolls 10, 9 with respect to the contact positions of the upper outer roll 4 or the lower outer roll 6 with the H-shaped steel 2 in the longitudinal direction of the H-shaped steel. 11
Either of + and + to the front and rear of the traveling direction of the H-section steel 2
It is configured such that the twist deformation of the H-section steel 2 can be corrected by shifting the distance by a. The warp and bending deformation may be corrected after correcting the twisting deformation.

In order to correct the torsional deformation by the method of the present invention using the straightening device 1 having such a structure, any one of the inner rolls 8 and 9 and the inner rolls 10 and 11, here, Then, the inner roll 10 is moved by + a and -a (here, a = 5 mm, but is adjusted between 0 and 5 mm) before and after the moving direction of the H-shaped steel 2 (Fig. 4).
Refer)). At this time, by moving the inner roll 10 to the + side, the right twist can be straightened, and by moving the inner roll 10 to the − side, the left helix can be perfectly corrected without recurrence of bending and warping.

Next, it will be described that the right twist (see FIG. 5) can be corrected by moving the inner roll 10 by + a. Here, moving only the inner roll 10 of the four inner rolls means that the rolling force position applied to the lower flange 5 with which the inner roll 9 is in contact, that is, the rolling force position from above and the rolling force position from below. And will be shifted by a distance of + a as shown in FIG.

As a result, the H-section steel 2 always advances while giving a tensile force in the direction of travel (see FIG. 4), so that the outer surface of the lower flange 5 is relatively elongated (tensile force) as compared with the inner surface. Occurs, and conversely a compressive force is applied to the inner surface.
This is because the upper and lower surfaces of the flange 5 are always subjected to a tensile force, but the inner upper surface becomes smaller than the outer lower surface. In other words, by applying a so-called upward warping deformation force, in which the upper surface is compressed by the compressive force and the lower surface is extended by the tensile force, only to the lower flange 5 on the side where the inner roll 10 is in contact, the H-shaped steel 2 is provided. Then, a force acts in the direction to correct the right twist deformation.

Next, when the right twist is generated by the moving device A, in order to perform the straightening operation without stopping the manufacturing line, first, the adjusting nut 18 is loosened and the straightening amount according to the twist amount is grasped. The inner roll housing 14 is moved to the right by an appropriate amount with the adjustment nut 18 on the left side of the drawing of FIG. At this time, the inner roll 10 naturally moves by that amount. Then, in this state, the inner roll housing 14 is temporarily fixed by the left and right adjusting nuts 18, 18, and the quality of the twist is checked.

Next, if the twisting quality is good, the left and right adjusting nuts 18, 18 are increased and fixed as they are, and if further correction is required, the twisting condition is checked to check the left and right adjusting nuts.
Adjust with 18, 18.

In the case of a left twist (see FIG. 5), the adjustment nut 18 on the left side is loosened, and the adjustment nut 18 on the right side moves the inner roll housing 14 by an appropriate amount. After that, the same operation as the above-mentioned right twist is performed.

FIG. 6 is a table comparing the correction method shown in FIG. 7 with the method of the present invention. Thus, according to the straightening method of the present invention, the line stop due to the twist straightening is "0".
As a result, the line operation rate improved by about 0.25%.

Further, a problem that can be considered when the correction method of the present invention is performed is flange deformation which is caused by applying a warping deformation force. However, assuming the state shown in Fig. 4, the x amount is x = 0, assuming 100% plastic deformation.
It will be 047 mm. This is an extremely small amount of 0.047 mm for a flange thickness of 2.3 mm or more, or the distance between both flanges, that is, the height of the H-section steel 2, and is sufficiently satisfactory for the tolerance of the lightweight H-section steel. It is a range.

Further, in this embodiment, the inner roll 10 of each inner roll is shown to be movable, but the same effect can be obtained for each of the inner rolls 8, 9 and 11.

[0030]

According to the straightening method of the present invention, the twisting deformation, which cannot be completely straightened by the conventional technique, can be reduced. It became possible to correct it easily and completely without any complication. Further, since the twisting deformation can be completely corrected, it is possible to smoothly correct the shape defect due to other bending and warping deformation.

Further, it is possible to provide a straightening device having a simple structure in which the inner roll is moved in the traveling direction of the H-section steel,
Moreover, the torsional deformation of the H-section steel can be reliably corrected without stopping the H-section steel production line.

[Brief description of drawings]

FIG. 1 is a partial schematic view showing a straightening device for carrying out a straightening method of the present invention.

FIG. 2 is a schematic view showing a straightening device for carrying out the straightening method of the present invention.

FIG. 3 is a view taken along the line BB of FIG.

FIG. 4 is a schematic view showing a straightening process with an inner roll in the straightening method of the present invention.

FIG. 5 is a schematic view showing a twisted deformation state of H-section steel.

FIG. 6 is a comparison table showing the results of implementation of the straightening method of the present invention and the conventional straightening method.

FIG. 7 is a schematic view showing a straightening device for carrying out a conventional straightening method.

FIG. 8 is a schematic view showing a straightening device for carrying out a conventional straightening method.

[Explanation of symbols]

1 ... Straightening device, 2 ... H-section steel, 3 ... Upper flange, 4 ... Upper outer roll, 5 ... Lower flange, 6 ... Lower outer roll, 7 ... Web, 8, 9, 10, 11 ... Inner roll, 12 ... Orthodontic device body, 13
... screw shaft fixing plate, 14 ... roll housing, 15 ... adjusting screw, 16 ... through hole, 17 ... housing moving plate, 18 ... adjusting nut, 19 ... gap part, A ... moving device.

Claims (1)

[Claims] 1. An upper roll and an upper roll of H-section steel are separately provided at the same position in the longitudinal direction of the flange, and two inner rolls are disposed at both side positions sandwiching the web of the H-section steel. At the time of pressing by sandwiching from above and below, the abutting position of the one side inner roll, which abuts the one flange, to the flange from the abutting position of the outer roll to the front and back in the H-section steel traveling direction. Is a straightening method for light-weight H-section steel, in which the shape is straightened as a position displaced by a predetermined distance in the direction, and the shifting of the contact position of the one-side inner roll is performed during straightening work of the light-weight H-section steel, that is, during the production line operation. By doing so, the tensile force applied to the upper and lower surfaces of the flange, which is the side on which the inner roll is in contact, is changed, and a warp deformation force is applied to this flange in a direction opposite to the direction of the torsional deformation generated in the H-section steel. Must be added Method of correcting weight H-beams, characterized.