JP5206082B2 - Shape steel straightening method and straightening device - Google Patents

Description

  The present invention relates to a method and apparatus for correcting a shape steel with high accuracy and high efficiency.

For example, for shape steel such as H-shaped steel, it is important to ensure the straightness in the longitudinal direction at the same time as ensuring the dimensional accuracy of the vertical cross-sectional shape. In order to ensure straightness, rolling mills for shape steels straighten the shape steel in the finishing process after the rolling process.
Conventionally, as a straightening process of a shaped steel, a straightening method using a roller leveler is generally used, and a straightening method using a cold universal rolling mill and front and rear pinch rolls (Patent Document 1) is known.

In the straightening method using a roller leveler, the pushing position of straightening rolls arranged in a staggered pattern on the top and bottom or the right and left of the shape steel passage line is adjusted, and appropriate repeated bending is applied so that the curvature decreases as the later stage. In this case, the curvature of the material to be corrected converges to zero. This straightening method using a roller leveler is a relatively compact facility, and has been widely used because it has the advantage of being capable of unmanned operation once set to appropriate conditions.

Moreover, in the correction method using the cold universal rolling mill and the front and rear pinch rolls, the material to be straightened is reduced by the rolling mill, and further, a longitudinal tension and a bending moment in the straightening direction are given to the material to be straightened. There was an advantage that the shape steel could be corrected with higher accuracy and higher efficiency.
JP 2001-246401 A

However, on the other hand, it is difficult to meet all the strict needs for dimensional accuracy and straightness in recent years by the correction method using a roller leveler, and shape steel is often used as a product after being cut to a predetermined size. In spite of this, in the roller leveler correction, residual stress due to repeated bending is applied in principle, so there is a large residual stress inside the shape steel, and the residual stress is released near the cut surface, resulting in local deformation of the product. There is a problem that the problem occurs remarkably.
Moreover, in the straightening method using the cold universal rolling mill and the front and rear pinch rolls, the cross-sectional shape of the material to be straightened is not necessarily the shape as intended. The problem that the yield state cannot be realized, and even if all the materials to be straightened have the desired shape, at least a cold universal rolling roll suitable for the shape is required for each product shape (type). There are problems such as increased equipment and higher costs.

  Therefore, in view of the above-described problems, the present invention pulls the shape steel in the longitudinal direction to achieve the entire cross-sectional yield state of the shape steel with high accuracy, and in a direction perpendicular to the longitudinal direction at any part of the shape steel. It is an object of the present invention to provide a method and an apparatus capable of correcting a shape steel with high accuracy and high efficiency by giving a displacement of.

  In order to achieve the above object, the present inventor constrains the end face of the straightening material, gives a tensile strain in the longitudinal direction of the steel material, and maintains a yielding state in the entire cross section, and a direction perpendicular to the longitudinal direction of the steel material by a roll or the like that moves in the longitudinal direction. We obtained knowledge that deformation can be corrected with high accuracy and efficiency by giving displacement to steel.

Therefore, according to the present invention, there is provided a straightening method for straightening a section steel, wherein the section steel is pulled in the longitudinal direction to bring the entire cross section into a yielding state, and the entire section is yielded from the longitudinal direction to an arbitrary portion of the section steel. There is provided a method for correcting a shaped steel, characterized in that correction is performed by applying a displacement in a direction perpendicular to the longitudinal direction while applying tension .

  Moreover, both ends of the shape steel are restrained by clamps, and the shape steel is pulled in the longitudinal direction, and a method for straightening the shape steel is provided.

  Furthermore, the straightening method of a structural steel characterized by displace | moving to the direction perpendicular | vertical to the longitudinal direction of the said structural steel by the roll or single roll which moves to the longitudinal direction of the said structural steel is provided.

Further, according to the present invention, there is provided a correction device for correcting the structural steel, tensile the section steel in the longitudinal direction, a mechanism pulling the entire cross-section and the yield state, to any portion of the shaped steel, said tension There is provided a straightening device for a shaped steel, characterized by having a displacement imparting mechanism that applies a displacement in a direction perpendicular to the longitudinal direction on the yielding state of the entire cross section by the mechanism .

  Further, the tension mechanism has a clamp for restraining both ends of the shape steel, and a power section for applying a tensile force in the longitudinal direction of the shape steel via the clamp. Is provided.

  The displacement imparting mechanism includes a single or a plurality of rolls that move along the longitudinal direction of the shape steel, and a roll support portion that applies displacement in a direction perpendicular to the longitudinal direction of the shape steel via the roll. There is provided a straightening device for a shaped steel.

  According to the present invention, it is possible to realize a full-section yield state with high accuracy without requiring a large number of rolls or the like for each cross-sectional shape of the section steel. The shape steel can be straightened.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the case where the angle steel which has L-shaped cross-sectional shape is corrected as an example of a shape steel is demonstrated. Further, in the present specification and the drawings, the same reference numerals are given to constituent elements having substantially the same functional configuration, and redundant description is omitted.

(First embodiment)
As a first embodiment, both ends of a section steel are restrained by clamps using FIGS. 1 and 2 and pulled in the longitudinal direction to bring the entire cross section into a yielding state, and any part of the section steel is elongated by a single roll. A correction apparatus and a correction method for providing displacement in a direction perpendicular to the direction will be described.
FIG. 1 is a schematic perspective view of a correcting device 1 according to a first embodiment of the present invention as viewed obliquely from above. FIG. 2 is an overview of the state of FIG. 1 as viewed from above. The shape steel 2 is restrained by clamps 10 at both ends 2a. The clamp 10 has a plurality of blocks 11, and both ends 2 a of the structural steel 2 are sandwiched and fixed between the blocks 11. A tensile force is applied to the longitudinal direction of the section steel 2 through the clamp 10 by the cylinder power unit 5. As described above, a shaft 15 is disposed in parallel to the structural steel 2 on the side of the structural steel 2 restrained by the clamp 10, and a roll support portion 16 is mounted so as to be movable along the shaft 15. A roll 18 is rotatably supported on the front surface of the roll support 16 via a pressing mechanism 17 and an arm 20. The roll 18 is pressed against the side surface of the structural steel 2 by the operation of the pressing mechanism 17. Moreover, the roll support part 16 can move to arbitrary positions along the axis | shaft 15, and the roll 18 is pressed on the arbitrary positions of the side surface of the structural steel 2 by this.

  In the straightening device 1 configured as described above, both ends 2a are constrained by the clamp 10, a tensile force is applied in the longitudinal direction of the section steel 2 by the cylinder power unit 5, and a cross section perpendicular to the longitudinal direction of the section steel 2 is applied. Yield stress is applied to the whole. In this way, the section steel 2 is brought into a yielding state for the entire cross section. And the roll support part 16 moves to arbitrary positions, and a displacement is given to the direction perpendicular | vertical to the longitudinal direction of the structural steel 2 via the roll 18 by operation | movement of the press mechanism 17. FIG. Further, by moving the roll support portion 16 in the longitudinal direction of the structural steel 2 with the pressing mechanism 17 in operation, an arbitrary displacement perpendicular to the longitudinal direction can be provided continuously in the longitudinal direction of the structural steel 2. . In this way, the shape steel 2 can be straightened very easily by applying a displacement from the side at an arbitrary position of the shape steel 2 in the full-section yield state. Moreover, it can be set as a full-section yield state only by applying a yield stress to the longitudinal direction of the shaped steel 2 via the clamp 10, and it is not necessary to prepare the roll for every cross-sectional shape.

Moreover, in the deformation correction method using a roller leveler, etc., residual stress remained in the shape steel after the deformation correction was performed. After that, since the deformation is corrected by applying an external force, no residual stress remains in the shape steel, and it is generated and remains in the cooling stage of the shape steel before the deformation correction. It is also possible to eliminate the residual stress.
That is, according to the present invention, the shape steel can be deformed and corrected with high accuracy and high efficiency, and since no residual stress remains, it can be said that it is very useful for commercialization.

(Second Embodiment)
As a second embodiment, both ends of the shape steel are restrained by clamps using FIGS. 3 and 4 and pulled in the longitudinal direction so that the entire cross section is in a yielded state. A correction apparatus and a correction method for providing displacement in a direction perpendicular to the direction will be described.
FIG. 3 is a schematic perspective view of the straightening device 1 ′ including the straightening machine 19 having a plurality of rolls according to the second embodiment of the present invention as viewed obliquely from above. Moreover, FIG. 4 is explanatory drawing showing the internal structure of the correction machine 19 at the time of seeing the mode of FIG. 3 from upper direction. The main configuration of the section 2 restraining portion of the straightening device 1 ′ is the same as that in the first embodiment, and is omitted. On both sides of the shape steel 2, shafts 15 are arranged in parallel to the shape steel 2, and a straightening machine 19 is provided so as to be movable along each shaft 15. On the inner side surface of the straightening machine 19 (the surface facing the side surface of the structural steel 2), six rolls are provided via the pressing mechanism 17 and the six arms 20a, 20b, 20c, 20d, 20e, and 20f. 18a, 18b, 18c, 18d, 18e, and 18f are rotatably supported, respectively. The six rolls 18 a, 18 b, 18 c, 18 d, 18 e, and 18 f are pressed against both side surfaces of the shape steel 2 on each side of the shape steel 2 by the operation of the pressing mechanism 17. However, the one-side rolls 18a, 18b, 18c and the other-side rolls 18d, 18e, 18f are not opposed to each other, and the other-side roll 18d is disposed between the one-side rolls 18a, 18b. One side roll 18a, 18b, 18c and the other side roll 18d, 18e, 18f are arranged in a staggered manner so that the other side roll 18e is arranged between the other rolls 18b, 18c. . Further, the straightening machine 19 can move to any position along the shaft 15, and thereby each roll 18 a, 18 b, 18 c, 18 d, 18 e, 18 f is pressed from both sides to any position on the side surface of the shaped steel 2. Each roll is arranged in the order of 18c, 18f, 18b, 18e, 18a, and 18d from strong pressing to weak pressing. In other words, the displacement perpendicular to the longitudinal direction applied to the section steel 2 is arranged in the order of 18c, 18f, 18b, 18e, 18a, and 18d from larger displacement to smaller displacement. However, in this case, the direction of displacement is opposite in 18a, 18b, 18c and 18d, 18e, 18f. This is the same as the basic concept of roll arrangement in the conventional roller leveler. In order to allow the shape steel 2 to be deformed more smoothly, the displacement of any of the intermediate rolls, for example, 18b, among the rolls aligned with 18c, 18f, 18b, 18e, 18a, 18d is maximized, Each roll may be set so that the displacement becomes smaller in order and the displacement becomes smaller in the order of 18e, 18a, and 18d. This is also the same as the case of roll arrangement with a roller leveler.

In the straightening device 1 ′ configured as described above, both ends 2 a are constrained by the clamp 10, a tensile force is applied in the longitudinal direction of the section steel 2 by the cylinder power unit 5, and a cross section perpendicular to the longitudinal direction of the section steel 2. Yield stress is applied to the whole. In this way, the section steel 2 is brought into a yielding state for the entire cross section. In this state, when the straightening machine 19 is moved from the left to the right in FIG. 4, each roll is perpendicular to the structural steel 2 in the order of 18c, 18f, 18b, 18e, 18a, and 18d. Displacement is given, and the amount of displacement gradually decreases. In other words, in the conventional roller leveler, the steel material is corrected by moving the steel material between the fixedly arranged rolls, whereas in this method, the roll arranged with respect to the fixed steel material is moved. Therefore, the steel material can be corrected by the principle of repeated bending similar to that of a roller leveler. However, in this method, the shape steel 2 is already in a yielded state due to the pulling force by the cylinder power section 5, and thus it is generated by pressing the vertical displacement and the roll given by each roll against the shape steel 2. The force is overwhelmingly smaller than that of the conventional roller leveler, and since it is in a yielding state in the entire cross section, the residual stress after correction can be brought close to zero. Furthermore, in this method, it is possible to carry out correction at an arbitrary position in the longitudinal direction of the steel material. In the present embodiment, the number of rolls is six, and the displacement applied in the direction perpendicular to the longitudinal direction of the section steel 2 is changed by each roll. In the present invention, the number and displacement of these rolls are changed. It is desirable that the set amount is appropriately changed according to the deformation state of the shape steel 2.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to said form. It will be apparent to those skilled in the art that various changes or modifications can be made within the scope of the ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

For example, the power unit 5 that applies a tensile force in the longitudinal direction to the shape steel 2 may be a power unit using a motor or the like instead of a cylinder. It is also possible to select a position where the roll 18 is pressed against the shape steel 2 to give a displacement, a position where the deformation is large in the longitudinal direction of the shape steel 2, or the deformation amount is any position in the longitudinal direction of the shape steel 2. If approximately equal, the roll 18 may be pressed over the entire length of the section 2. Furthermore, a plurality of arbitrary rolls 18 that give displacement in a direction perpendicular to the longitudinal direction of the structural steel 2 can be arranged on both sides of the structural steel 2. In this case, for example, the entire roll 18 group may be moved in any one of the longitudinal directions after setting the pressing force of each roll 18 to have an arbitrary relationship. Needless to say, useful shapes and materials of the roll 18 may be used as appropriate.
In the present embodiment, the angle steel is described as an example. However, the present invention can be applied to other shape steels such as a groove shape steel, an I shape steel, an H shape steel, and a Z shape steel.

FIG. 5 is a schematic view showing a state in which a tensile force is applied in the longitudinal direction of the deformed shape steel 2 to obtain a yielded state. Then, as shown in FIG. 5 (a), each point on the upper part and the lower part of the deformed part of the shaped steel 2 when a tensile force is applied to the initially deformed shaped steel 2 to correct the deformation as shown in FIG. 5 (b). FIG. 6 shows a graph of the magnitude of stress and strain applied to α and point β. Note that the point α is a portion contracted by the initial deformation, and the point β is a portion extended by the initial deformation. In FIG. 6, the difference 100 in the magnitude of strain between the points α and β when no stress is applied represents the initial strain, and as the stress is applied, strain is added in the order of α → β.

  The curves showing the relationship between the stress applied to each point α and point β and the magnitude of strain shown in FIG. 6 are uniformly determined by the material of the section steel 2 and are both the same curve. As the value increases, it converges to a constant value. For example, at point A, when the tensile force applied to the structural steel 2 is unloaded, the structural steel 2 returns to the direction opposite to the direction in which the tensile force is applied according to the Young's modulus determined by the material. Therefore, the strain difference 101 between the points α and β remains. The strain difference 101 is a strain that cannot be corrected when the section steel 2 is straightened up to the point A. For example, when the straightening is performed up to the point B, as shown in FIG. There is almost no distortion difference between α and point β. That is, by pulling to the point B, in theory, almost complete correction can be performed only by pull correction.

  However, when the shape steel 2 is actually pulled and corrected to the point B, for example, when there is a dimensional change in the longitudinal direction of the material to be corrected, the shape steel 2 may be broken due to stress concentration.

  Therefore, the inventor performs a tensile correction by applying a tensile force to the shape steel 2 to, for example, the point A, and further unloads the tensile force by adding a displacement to the point β, for example, while the shape steel 2 is pulled at the A point. The present invention was devised so that the distortion difference between the later points α and β hardly remains.

  Then, both ends of the shape steel 2 are constrained, the cylinder power unit 5 gives a constant tensile force to the shape steel 2 so as not to be broken, and a yield of the entire cross section is obtained. By giving the displacement in the vertical direction, the deformation correction of the shape steel 2 could be performed with high accuracy and high efficiency.

  FIG. 7 shows a state where a T-shaped steel, which is normally used as a product, is made by cutting an H-shaped steel. In order to change the H-shaped steel 30 to the T-shaped steel 31 which has been deformed and corrected by the conventional technology, as shown in FIG. Due to the residual stress generated inside the steel, deformation occurs as shown in FIG. 7 (b). However, when the present invention is applied to such a case, the H-section steel 30 is brought into a full-section yield state by a pulling force, so that the residual stress in the H-section steel 30 is reduced to the maximum and partially cut as a product or the like. The deformation in the case hardly occurred.

FIG. 8 shows the deformation of a long section steel. In the long shape steel 40, the deformation at the stage where it is cooled from the heated state to room temperature is deformed only at both end portions 41 as shown in FIG. This is because when the long section steel 40 is placed in a cooling place or the like, the middle portion 42 does not bend even when stress is applied during cooling due to its own weight. However, since both ends 41 of the long shaped steel 40 are deformed as shown in FIG. 8, the entire long shaped steel 40 is stressed during cooling, and remains in the middle portion 22 where it does not bend. It can be seen that stress is generated.
When applying the present invention to such a long shaped steel 40, the amount of displacement given in the direction perpendicular to the longitudinal direction of the long shaped steel 40 is the internal residual stress that can be derived from the curvature of deformation of both end portions 41. It is considered to be determined by Then, the residual stress can be removed by applying the displacement of the present invention to the extent that the residual stress of the long shaped steel 40 is removed based on the determined displacement amount, and highly accurate deformation correction. Was able to do.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a method and an apparatus for correcting a shape steel with high accuracy and high efficiency.

It is the perspective view which looked at the straightening apparatus of a shape steel from diagonally upward. It is the general-view figure which looked at the mode of Drawing 1 from the upper part. It is the perspective general view which looked at the correction apparatus 1 'provided with three rolls from diagonally upward. It is explanatory drawing showing the internal structure of the correction machine 19 at the time of seeing the mode of FIG. 3 from upper direction. It is the schematic showing the mode at the time of applying a tensile force to the deformed shape steel and setting it as a yielding state. FIG. 3 is a graph showing the magnitude of stress and strain applied to each of the upper and lower points α and β of the shape steel when the deformation is corrected. It shows the appearance when T-shaped steel is made by cutting H-shaped steel. This shows the deformation of a long section steel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Straightening apparatus 1 '... Straightening apparatus 2 provided with the some roll ... Shape steel 2a ... Crop part 5 ... Cylinder power part 10 ... Clamp 11 ... Block 15 ... Shaft 16 ... Roll support part 17 ... Pressing mechanism 18 ... Roll 19 ... straightening machine 20 ... arm 21 ... cutting surface 30 ... H-shaped steel 31 ... T-shaped steel 40 ... long shaped steel 41 ... both ends 42 of the long shaped steel ... middle part 100 of the long shaped steel ... initial strain 101 ... Strain that cannot be corrected when pulling up to point A

Claims (6)

A straightening method for straightening a shape steel, wherein the shape steel is pulled in the longitudinal direction, the entire cross-section is in a yielded state, and tension is applied to any part of the shape steel from the longitudinal direction to yield a full cross-sectional yield. A method for correcting a shaped steel, characterized by performing correction by applying a displacement in a direction perpendicular to the shape. 2. The method of straightening a shape steel according to claim 1, wherein both ends of the shape steel are constrained by clamps and the shape steel is pulled in a longitudinal direction. 3. The method of straightening a structural steel according to claim 1 or 2, wherein displacement is applied in a direction perpendicular to the longitudinal direction of the structural steel by one or a plurality of rolls moving in the longitudinal direction of the structural steel. A straightening device for straightening a shape steel, wherein the shape steel is pulled in the longitudinal direction and the entire cross section is in a yielded state, and an arbitrary portion of the shape steel is subjected to a yielding state of the entire cross section by the pulling mechanism. A shape steel straightening device having a displacement imparting mechanism that imparts a displacement in a direction perpendicular to the longitudinal direction. 5. The structural steel according to claim 4, wherein the pulling mechanism includes a clamp that restrains both ends of the structural steel, and a power unit that applies a tensile force to the longitudinal direction of the structural steel via the clamp. Straightening device. The displacement imparting mechanism has a single or a plurality of rolls that move along the longitudinal direction of the shape steel, and a roll support portion that gives displacement in a direction perpendicular to the longitudinal direction of the shape steel via the roll. The shape steel straightening device according to claim 4 or 5, wherein

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