JP2010194565A - Bend straightening device of angle steel and method for manufacturing the angle steel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve productivity of an angle steel by reducing time and cost required for straightening the bend of the angle steel. <P>SOLUTION: The bend straightening device of the angle steel includes: a roller 28 on which the first flange 6 of the angle steel 5 is mounted; a pair of support members 46 for supporting the outer surface of the second flange 7 of the angle steel 5 at two points that are separated from each other in the longitudinal direction thereof; and a cylinder 47 which presses the angle steel 5 from the inside and deforms it at the middle of the pair of the support members 46. A pressing member 72 is mounted at the tip of the cylinder 47 and the cylinder 47 is extended in a tilting direction to the respective first and second flanges 6, 7, so that the pressing member 72 presses the respective inner surfaces of the first and second flanges 6, 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for correcting the bending of angle irons used for the skeleton of large structures such as ships and bridges, and a method for manufacturing the angle irons.

  Since shape steel such as angle steel is manufactured through a rolling process, bending and warping generally occur. In order to improve the quality, it is necessary to eliminate such bending, and various methods for suppressing the occurrence of bending of the shape steel and methods for correcting the bending have been conventionally proposed (see, for example, Patent Documents 1 and 2).

  Patent Document 1 discloses a method of manufacturing an angle steel while suppressing the occurrence of bending. According to this method, when the grooved steel web is cut to produce two angle steels, the cutting is performed in two stages. That is, cutting edges are formed on both sides of the web while hot to form notches, and this is cooled and roller straightened, and then the cutting edges are reinserted into the notches to completely bisect the web.

  Patent Document 2 discloses a method for correcting the bending of the H-shaped steel web. This method corrects the bending of the web by pressing the web supported at two points separated in the longitudinal direction of the section steel from both sides in the normal direction.

JP 2007-237275 A Japanese Patent Laid-Open No. 2008-30090

  However, according to the method of Patent Document 1, it takes a lot of time and cost to cut the channel steel. Also, since the residual stress of the channel steel is released when the web is bisected, it is difficult to completely suppress the bending of the angle steel, and eventually the process of pressing the angle steel and correcting the bending is difficult. Indispensable.

  When the residual stress of the channel steel is released, bending occurs in both of the two flanges forming the angle steel. In order to correct this bending, when the angle steel is pressed using the method of Patent Document 2, after pressing one flange and correcting the bending, the other flange is pressed and the bending is corrected. Therefore, the process of correcting the bending becomes complicated.

  Accordingly, an object of the present invention is to reduce the time and cost required for correcting the bending of the angle steel, and to increase the productivity of the angle steel.

  The present invention has been made in view of such circumstances, and an angle correction device for angle iron according to the present invention includes a roller on which a first flange of angle iron is placed and an outer surface of a second flange of angle iron. A pair of supporting members that are supported at two points separated in the longitudinal direction; and a cylinder that presses and deforms the angle steel from the inside in the middle of the pair of supporting members, and a presser is attached to the tip of the cylinder The cylinder is extended in a direction inclined with respect to each of the first and second flanges, whereby the pressing elements press the inner surfaces of the first and second flanges, respectively.

  With this configuration, the pressing force acting on the angle steel from the cylinder is decomposed into a component in the normal direction of the first flange and a component in the normal direction of the second flange, and is placed on the roller. The first flange and the second flange supported by the support member are simultaneously and automatically plastically deformed. Therefore, the time and cost required for correcting the bending of the angle steel are reduced, and the productivity of the angle steel is improved.

  It is preferable that the radius of curvature of the portion of the presser that is brought into contact with the inner corner of the angle steel is smaller than the radius of curvature of the inner corner of the angle steel. Thereby, it can prevent that a 2nd flange is bent outside with respect to a 1st flange on the basis of an internal corner | angular part.

  It is preferable that a presser support structure for supporting the presser is further provided, and the presser is attached to be relatively movable with respect to a tip portion of the cylinder. Thereby, it is not necessary to support the weight of the pressing element with the cylinder, and the load acting on the cylinder is reduced.

  The second flange is bent more than the first flange, and the axis of the cylinder is inclined closer to the first flange with respect to the bisector of the angle formed by the first flange and the second flange. It is preferable. As a result, the pressing force acting on the angle steel is decomposed so that the component force of the component in the normal direction of the second flange having a large bending is increased, so that the bending of the angle steel is efficiently corrected.

  The side of the second flange may be shorter than the side of the first flange. Thereby, in the unequal side angle steel (invert angle) in which the second flange on the short side tends to bend more than the first flange, the bending is efficiently corrected.

  The controller further includes a controller for controlling the operation of the roller and the cylinder, the controller intermittently drives the roller to convey the angle steel in the longitudinal direction by a predetermined length, and presses the angle steel while the roller is stopped. It is preferable that the cylinder is driven. As a result, even in a long angle steel, the entire bending can be automatically and continuously corrected, and the time and cost required to correct the bending can be reduced.

  A pair of auxiliary support members that support the inner surface of the second flange at two points separated in the longitudinal direction; and an auxiliary cylinder that deforms the angle steel by pressing it from the outside between the pair of auxiliary support members. Is preferred. Thereby, even if the bending remains after the operation of the cylinder, the angle steel can be corrected again to a desired shape by the auxiliary support member and the auxiliary cylinder.

  A pair of auxiliary support members that support the inner surface of the second flange at two points separated in the longitudinal direction, and an auxiliary cylinder that plastically deforms the angle steel by pressing it from the outside between the pair of auxiliary support members. You may have. Thereby, even if bending remains in the first flange after the operation of the cylinder, the angle iron can be corrected again to a desired shape by the auxiliary support member and the auxiliary cylinder.

  The angle steel manufacturing method according to the present invention is characterized in that a grooved steel web is cut to generate two angle steels, and the bending straightening device is operated to correct the angled steel bending. It is said.

  By adopting such a method, even if the angle steel is bent greatly due to the release of the residual stress of the channel steel due to the cutting of the channel steel, the time and cost can be reduced by using the bending straightener according to the present invention. The bend can be corrected without applying. That is, high quality angle steel can be provided without spending much time and cost for the cutting process.

  As described above, according to the present invention, the time and cost required for correcting the bending of the angle steel can be reduced, and the productivity of the angle steel can be increased.

It is explanatory drawing of the angle iron manufacturing equipment which concerns on embodiment of this invention. It is explanatory drawing of the manufacturing method of the angle steel performed in the angle steel manufacturing equipment shown in FIG. 1, (a) is a perspective view of the grooved steel manufactured in a rolling part, (b) is a grooved steel in a cutting part. It is a perspective view which shows the state which has cut | disconnected, (c) is a perspective view of the two angle irons produced | generated by the cutting part. It is a figure which sees the two angle irons mounted in the table after cutting of the cutting part shown in Drawing 1 from the longitudinal direction tip side. It is a top view of the correction | amendment part shown in FIG. FIG. 5 is a side view of the left straightening machine viewed from the left side as indicated by an arrow V in FIG. 4. It is the elements on larger scale of FIG. 4, and is a top view of the left side correction machine. It is sectional drawing of the straightening machine cut | disconnected and shown along the VII-VII line of FIG.5 and FIG.6. It is sectional drawing of the straightening machine cut | disconnected and shown along the VIII-VIII line of FIG.5 and FIG.6. It is sectional drawing of the straightening machine cut | disconnected and shown along the IX-IX line of FIG. It is a block diagram which shows the structure of the control system of the straightening machine shown in FIG. It is a figure explaining the operation | movement which correct | amends the bending of the angle iron performed by operating the cylinder shown in FIG. It is a figure explaining the operation | movement which correct | amends the bending of the angle iron performed by operating the auxiliary | assistant cylinder shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing an angle steel manufacturing facility 10 according to an embodiment of the present invention. The angle steel manufacturing facility 10 includes a rolling part 11 that manufactures a channel steel, a cutting part 12 that generates the angle steel by cutting the channel steel, and a correction part 13 that corrects the bending of the angle steel. Yes. The angle steel whose curvature has been corrected by the correction unit 13 is shipped as a product, and the shipped product is mainly used as a skeleton of a large structure such as a ship or a bridge.

  FIG. 2 is an explanatory diagram of a method for manufacturing the angle steel 5 performed in the angle steel manufacturing facility 10 shown in FIG. Referring to FIGS. 1 and 2 (a) together, in the rolling section 11, a channel steel 1 having a web 2 and two flanges 3, 3 is manufactured by rolling from a steel raw material such as a slab or billet. . In FIG. 2 (a), the grooved steel 1 is shown by being broken in the longitudinal direction, but the grooved steel 1 is relatively long in accordance with the application form. In addition, since the equipment itself which performs hot rolling is well-known, the detailed description is abbreviate | omitted.

  Referring to FIGS. 1, 2 (b) and 2 (c) together, in the cutting part 12, the channel steel 1 manufactured in the rolling part 11 is cut along the center line 4 in the width direction of the web 2. As a result, two angle irons 5 and 5 are produced. This cutting may be performed using a cutting blade, but if plasma cutting is employed, sagging of the cut surface can be reduced as much as possible, which contributes to improvement in quality.

  As shown in FIG. 2 (c), the angle steel 5 has a first flange 6 and a second flange 7 that are substantially orthogonal to each other in an L shape, and the web 2 of the channel steel 1 is divided into two to form the first flange 6. Thus, the flange 3 of the channel steel 1 becomes the second flange 7 as it is. That is, the dimension A of the side of the first flange 6 is approximately half of the width W of the web 2 of the channel steel 1, and the dimension B of the side of the second flange 7 is the height H of the flange 3 of the channel steel 1. Is equal to The thickness t1 of the first flange 6 and the thickness t2 of the second flange 7 are equal to the thicknesses of the web 2 and the flange 3 of the channel steel 1, respectively. Here, as the angle steel 5, an unequal side unequal thickness angle steel is exemplified, and A is larger than B and t1 is smaller than t2. The dimension L in the longitudinal direction of the angle steel 5 is equal to the dimension L ′ of the channel steel 1. Thus, in this manufacturing method, since the angle steel 5 is formed from the channel steel 1, the dimension of the channel steel 1 is determined according to the dimension of the angle steel 5 which is a final product. In addition, for example, the corner portion where both flanges 6 and 7 intersect is formed so as to bend the inside thereof, and the radius of curvature r1 (see FIG. 10) of the inner corner portion 8 is also the manufacturing stage of the channel steel 1 It is decided by.

  Although detailed illustration is omitted, the cutting unit 12 will be described in more detail. The cutting unit 12 includes a cutting machine such as a plasma cutting machine, a cutting front table and a cutting rear table sandwiching the cutting machine, and a cutting front table. A plurality of rollers are provided at intervals from the cutting surface table to the cutting rear surface table, and this configuration is similar to a correction front table 15, a correction machine 16, and a correction rear surface table 17 of the correction unit 13 described later (see FIG. 4). ). The grooved steel 1 conveyed from the rolling unit 11 is placed on the cutting front table and waits for the cutting process. When the process is executed, the grooved steel 1 is sent to the rear surface table through a cutting machine by a roller. When the channel steel 1 passes through the cutting machine, the web 2 is cut sequentially from the tip (see FIG. 2B). When the entire length of the channel steel 1 passes through the cutting machine, the web 2 is completely divided into two in the width direction to generate two angle steels 5 and 5 (see FIG. 2C). The two angle steels 5 and 5 generated in this way are placed on the cut rear surface table.

  FIG. 3 is a view showing the two angle irons 5 and 5 placed on the roller 12d of the cut rear surface table 12c of the cutting portion 12 when viewed in the longitudinal direction. Since the internal stress due to rolling remains in the grooved steel 1, the residual stress is released when the web 2 is cut (see arrow S in FIG. 2 (b)), and each angle steel 5, 5 is bent. . This bend appears on both the first and second flanges 6 and 7, the first flange 6 bends toward the outside (that is, the inner corner 8 is the side from which the second flange 7 extends), and the second flange 7 is also on the outside ( That is, the inner corner portion 8 bends toward the side where the first flange 6 extends. In the illustrated unequal side unequal thick angle steel, the second flange 7 tends to bend more than the first flange 6.

  Returning to FIG. 1, since it is difficult to ship as a non-defective product if bending remains, the bending of the two angle irons 5 and 5 generated by the cutting unit 12 is corrected in the correction unit 13. That is, the first and second flanges 6 and 7 are pressed from the inside to be plastically deformed to eliminate bending. In this manufacturing method, the angle steel 5 is introduced into the straightening machine 16 shown in FIG. 4 one by one, and the straightening machine 16 is operated to automatically correct the bending of the angle steel 5.

  FIG. 4 is a plan view of the correction unit 13 shown in FIG. In the following description, for convenience, the right side of FIG. 4 is “front side”, the opposite side is “rear side”, the upper side of FIG. 4 is “right side”, and the opposite side is “left side”. Sent from the front side to the rear side. Moreover, although illustration of angle iron is abbreviate | omitted in FIG. 4, the structure which concerns on angle iron is attached | subjected and demonstrated with the referential mark of FIG.

  As shown in FIG. 4, the correction unit 13 includes a sorting table 14, a correction front table 15, a correction machine 16, and a correction rear surface table 17. The sorting table 14 extends linearly back and forth so as to be continuous from the rear end of the cut rear surface table 12c (see FIG. 3) of the cutting portion 12, and a plurality of straddling tables 14 span between the pair of left and right beams 21 and 21. A roller 22 is provided. The plurality of rollers 22 are provided at intervals in the front-rear direction. By these rollers 22, the two angle steels 5 and 5 mounted on the cut rear surface table 12c are simultaneously sent to the sorting table 14.

  The pair of left and right correction front tables 15 are provided with the sorting table 14 sandwiched between the left and right. A conveyance mechanism 24 is provided between each of the right and left straightening front tables 15 and the sorting table 14, and the right angle iron out of the two angle irons 5 and 5 is on the right side of the sorting table 14. The left angle iron is distributed to the left correction front table 15 by the left transfer mechanism 24 with respect to the sorting table 14.

  The correction front table 15 includes a plurality of rollers 26 extending left and right between a pair of left and right beams 25, 25 extending in the front-rear direction, and these rollers 26 are provided at intervals in the front-rear direction. The angle steel 5 sent from the sorting table 14 is in a state where the first flange 6 is placed on these rollers 26 and the second flange 7 stands up with respect to the rollers 26, and in this state, the start of the correction process is awaited. To do.

  The straightening machine 16 and the straightening rear surface table 17 are respectively provided corresponding to the right and left straightening front tables 15, and a pair of right and left straightening machines 16 are arranged on the rear side of each straightening front table 15. A pair of left and right correction rear surface tables 17 are arranged on the rear side of 16 so as to extend forward and backward. In this way, the straightening front table 15, the straightening machine 16, and the straightening rear table 17 are provided side by side in a straight line. The straightening machine 16 is provided with a plurality of rollers 28 spaced in the front-rear direction, and the straightening rear surface table 17 is also provided with a plurality of rollers 30 extending left and right between a pair of left and right beams 29 extending in the front-rear direction. Is provided.

  For this reason, the angle steel 5 in which the first flange 6 is placed on the roller 26 in the straightening front table 15 passes through the straightening machine 16 by the rotation of the rollers 26, 28, 30 to the straightening rear surface table 17. It will be sent backwards. When the angle iron 5 passes through the straightening machine 16, the bending is corrected in order from the tip to the longitudinal direction.

  Thus, in this manufacturing equipment 10, since the cutting part 12 and the correction | amendment part 13 are continuing linearly, it is continuously from the process of cutting the groove steel 1 to the process of correcting the bending of the angle steel 5. Transition smoothly. In this case, the two chevron steels 5 and 5 are sent to the correction unit 13 in different symmetric postures, but the left chevron and the right chevron are distributed to the left and right in different systems. It is possible to correct the bending independently. For this reason, compared with the case where one straightening machine 16 is provided for the two angle steels 5 and 5, not only the production efficiency of the angle steel is simply doubled, but also the difference in the attitude of the angle steel 5 is accommodated. Thus, it is not necessary to operate the transport mechanism 24 or to rotate only one of the angle steels before the start of the correction process, so that the operation of the correction unit 13 can be avoided from becoming complicated.

  Next, the configuration of the straightening machine 16 will be described. However, although the left and right straightening devices 16 and 16 are arranged symmetrically with each other, since the respective configurations are the same, the left straightening device will be described as a representative of the two.

  FIG. 5 is a side view showing the left straightening machine 16 as viewed from the left side as indicated by an arrow V in FIG. As shown in FIG. 5, the straightening machine 16 has a horizontal base 43 supported by a plurality of legs 42 on a base 41 fixed to the floor surface 40 of the straightening unit 13. The rollers 28 described above are supported by bearings 44 provided on the upper surface of the base 43, and are provided symmetrically in the front-rear direction with the front-rear center line 45 in between (see FIG. 6 for rollers disposed at the rear end). ). The upper end position of the roller 28 of the straightening machine 16 is arranged at the same position as the upper end position of the roller 26 of the front correction table 15 and the upper end position of the roller 30 of the rear correction table 17. For this reason, the side tangent common tangent of these rollers 26, 28, and 30 is horizontally directed forward and backward, and the angle steel 5 supported by the roller 26 of the correction front table 15 moves backward substantially horizontally along the common tangent. Will be sent.

  FIG. 6 is a partially enlarged view of FIG. 4 and is a plan view of the left straightening machine 16. As shown in FIG. 6, a pair of front and rear support members 46, a hydraulic cylinder 47, a pair of front and rear auxiliary support members 48, and a hydraulic auxiliary cylinder 49 are provided on the upper side of the base 43. Yes. The support member 46 and the auxiliary support member 48 are arranged symmetrically with respect to the front / rear center line 45. Each axis of the cylinder 47 and the auxiliary cylinder 49 is directed to the left and right in a plan view and is collinear with the front and rear center lines 45. With this arrangement, the cylinder 47 operates so that the center of the pair of front and rear support members 46 expands and contracts left and right in plan view, and the auxiliary cylinder 49 operates so that the center of the pair of front and rear auxiliary support members 48 extends and contracts left and right in plan view. To do. In the present embodiment, the case where the support member 46 and the auxiliary support member 48 are arranged so as to oppose each other in the left-right direction is illustrated, but the positional relationship between these members 46 and 48 is not particularly limited.

  FIG. 7 is a cross-sectional view of the straightening machine 16 taken along the line VII-VII in FIGS. As shown in FIG. 7, the support member 46 is fixed to the base 43 via an L-shaped bracket 50. The bracket 50 is erected upward such that one flange is fastened to the upper surface of the base 43 with a bolt and the other flange faces the right side. A stay portion 51 of a support member 46 is attached to the right surface of the other flange, and the support member 46 is provided so as to protrude rightward with respect to the bracket 50 above the base 43. In this way, the right end surface 52 of the support member 46 functions as a support surface that supports the outer surface of the angle steel 5.

  The support member 46 is provided on the bracket 50 through the stay portion 51 so as to be slidable up and down. A bracket 53 that protrudes to the right is fixed to the upper end surface of the bracket 50, and an air cylinder 54 with an axis line directed up and down is fixed to the bracket 53. A support member 46 is fixed to the tip of the air cylinder 54, and the support member 46 slides up and down according to the expansion and contraction of the air cylinder 54. Thereby, the position which supports this according to the length of the side of the angle iron 5 can be adjusted up and down.

  Further, a pair of front and rear bases 55 are erected on the base 43, and the base end portion of the swing arm 56 is coupled between these bases 55 by pins 57. The auxiliary support member 48 is fixed to the tip of the swing arm 56 and can swing with respect to the base 43 around the pin 57. Since the auxiliary support member 48 is made of cast iron and has a large weight, a handle 58 is attached to the auxiliary support member 48 so that the swinging operation can be easily performed.

  The swinging range of the auxiliary support member 48 will be specifically described. The base end portion of the swinging arm 56 has two restricting pieces 59 and 60 protruding outward in the radial direction. A restriction block 61 is provided in the lower part. The restriction block 61 includes a first contact surface 61a that is inclined obliquely downward to the right and a second contact surface 61b that extends vertically to the left of the first contact surface 61a. As shown by the solid line in FIG. 7, when the auxiliary support member 48 is swung so as to fall to the right side from the state of extending upward, one of the restricting pieces 59 is brought into the first contact in the state of the swing arm 56 extending obliquely upward to the right. It hits the surface 61a. Thereby, the rotational moment acting on the swing arm 56 based on the weight of the auxiliary support member 48 is supported by the restriction block 61, and further swing of the auxiliary support member 48 is restricted. On the other hand, when the auxiliary support member 48 is swung so as to fall to the left from the state extending upward, the other restricting piece 60 hits the second contact surface 61b in a state where the swing arm 56 extends horizontally to the left. Accordingly, further swinging of the auxiliary support member 48 is restricted in the same manner. Thus, the auxiliary support member 48 has a position where the restricting piece 59 abuts on the first abutting surface 61a (hereinafter referred to as “retracted position”) and a position where the restricting piece 60 abuts on the second abutting surface 61b (hereinafter referred to as “the retreat position”). When the auxiliary support member 48 is positioned at the operating position, the tip surface 62 is directed leftward to support the outer surface of the angle steel 5. Function.

  FIG. 8 is a sectional view of the straightening machine 16 taken along line VIII-VIII in FIGS. As shown in FIG. 8, the platform 43 has an extending portion 43 a that extends to the right in the peripheral region of the front and rear center lines 45, and the extending portion 43 a is a trapezoidal shape provided between the legs 42. It is firmly supported by the leg 42 and the base 41 via the bracket 42a. A cylinder 47 is fixed to the upper surface of the extending portion 43 a via a cylinder fixing portion 63.

  The cylinder fixing portion 63 includes a horizontal base 64 fixed to the extending portion 43a, a pair of front and rear column portions 65 extending upward from the base 64, a beam portion 66 straddling between the upper end surfaces of the column portions 65, and a base 64. The mounting plate 67 is provided so as to fill the space surrounded by the column portion 65 and the beam portion 66. The mounting plate 67 extends from the base 64 so as to incline to the left, and the axis of the circular hole 68 passing through the central portion of the mounting plate 67 is directed obliquely downward to the left.

  The cylinder 47 is a hydraulic cylinder having a head 69 and a rod 70, and the large-diameter head 69 is fitted in the circular hole 68, and the rod 70 is provided so as to extend to the left with respect to the mounting plate 67. . The axis of the cylinder 47 is coaxial with the circular hole 69 and is directed obliquely downward to the left. By controlling the hydraulic pressure supplied to and discharged from the cylinder 47, the rod 70 of the cylinder 47 expands and contracts along this axis.

  A heavy weight presser 72 formed by forming a cast iron block in a substantially rectangular parallelepiped shape is attached to the end of the rod 70 of the cylinder 47. The pressing element 72 is attached to the cylinder 47 so as to be slightly movable, in other words, with a backlash. For this reason, it is not necessary to support the weight of the pressing element 72 in the cylinder 47, and the load acting on the cylinder 47 can be reduced. Instead, the corrector 16 is provided with a presser support structure 73 for supporting the weight of the presser 72.

  FIG. 9 is a cross-sectional view of the straightening machine 16 taken along line IX-IX in FIG. Referring to FIGS. 8 and 9 together, a horizontal bracket 74 extending horizontally to the left from the beam portion 66 of the cylinder fixing portion 62 is fixed. The clamping bracket 75 is fastened. The pair of front and rear clamping brackets 75 are arranged so that the pressing element 72 is sandwiched between the front and rear. Here, a guide groove 76 extending in parallel is formed on the front surface and the rear surface of the pressing element 72, and the pressing element 72 has an end of the rod 70 so that the guide groove 76 is substantially parallel to the axis of the cylinder 47. It is attached to the part. Guide pins 77 are provided at the lower end portion of the holding bracket 75 so as to protrude inward and rearward, and each guide pin 77 is received in the guide groove 76.

  As a result, the weight of the pressing element 72 is supported by the cylinder fixing portion 62 via the clamping bracket 75 and the horizontal bracket 74 when the surface defining the guide groove 76 is engaged with the guide pin 77. As described above, the presser support structure 73 includes the cylinder fixing portion 63, the horizontal bracket 74, and the holding bracket 75, and a trapezoidal bracket 78 is further spanned between the beam portion 66 and the horizontal bracket 74. Thus, the strength of the presser support structure 73 is increased. When the cylinder 47 expands and contracts, the guide pin 77 slides relatively in the guide groove 76, and the presser 72 moves along the direction in which the guide groove 76 extends.

  As shown in FIG. 8, an auxiliary cylinder 49 is fixed to the upper surface of the left edge portion of the base 43 via an auxiliary cylinder fixing portion 79. The auxiliary cylinder fixing portion 79 has a horizontal base 80 fixed to the upper surface of the base 43 and a mounting plate 81 extending upward from the left edge portion of the base 80. A circular hole 82 passes through the central portion of the mounting plate 81, and the axis of the circular hole 82 is horizontally directed to the left and right.

  The auxiliary cylinder 49 is also a hydraulic cylinder having a head 83 and a rod 84. The large-diameter head 83 is fitted in the circular hole 82 so that the rod 84 extends horizontally to the right with respect to the mounting plate 81. Is provided. In this way, the axis of the auxiliary cylinder 49 is coaxial with the circular hole 82 and is directed horizontally to the left and right. Note that a trapezoidal bracket 85 is stretched between the base 80 and the mounting plate 81, thereby increasing the strength of the auxiliary cylinder fixing portion 79.

  FIG. 10 is a block diagram showing the configuration of the control system of the correction unit 16 shown in FIG. As shown in FIG. 10, the straightening machine 16 is provided with a controller 90 that controls the operations of the rollers 26, 28, 30, the cylinder 47 and the auxiliary cylinder 49. In addition, an operation panel 91, a bending sensor 92, and a passage sensor 93 are connected to the controller 90. The operator can set the extension amount when the cylinder 47 and the auxiliary cylinder 49 are operated and the intermittent drive time of the rollers 26, 28, and 30 on the operation panel 91. The time for maintaining the extended amount can be set.

  The bending sensor 92 is provided in the vicinity of the front and rear center lines on the upper surface of the base 43, measures the bending of the flange standing up with respect to the roller 28 of the two flanges 6 and 7 of the angle iron 5, and the result is the controller. Output to 90. As a specific configuration of the bending sensor 92, for example, a distance measuring sensor that emits laser light and measures the distance to the reflecting surface based on the reflected light can be used.

  The passage sensors 93 are provided at both front and rear ends of the upper surface of the base 43, and detect whether the angle steel 5 has reached the straightening machine 16 or has passed through the straightening machine 16, and the result is obtained. Output to the controller 90. As a specific configuration of the passage sensor 93, for example, a reflection type photo interrupter can be used.

  Hereinafter, the operation | movement which correct | amends the bending of the angle iron 5 performed in the correction part 13 is demonstrated. As described above, the angle steel 5 waiting for the start of the straightening process is such that the first flange 6 is placed on the roller 26 of the straightening front table 15 and the second flange 7 is erected therefrom. In the illustrated unequal side unequal thickness angle steel, since the bending of the first flange 6 is smaller than that of the second flange 7, more rollers 26 can be brought into contact with the angle steel 5, and the angle steel 5 can be conveyed. This can be done more reliably. Further, as described above, the inner corner portion 8 of the angle steel 5 is located on the left and right outer sides (left side in the left correction front table 15), and the outer surface of the second flange 7 is supported by the pair of front and rear support members 46. It faces the surface 52.

  At the start of the straightening process, the bending of the flanges 6 and 7 is visually recognized by the operator, and according to the degree of the bending, the intermittent feed amount of the angle steel 5 by the rollers 26, 28 and 30 and the extension of the cylinder 47 on the operation panel 91. The amount and the holding time in a state where the cylinder 47 is extended are input. The operator holds the handle 58 and keeps the auxiliary support member 48 at the retracted position.

  When the operator operates the start switch on the operation panel 91, the rollers 26, 28, and 30 are rotationally driven, and the angle steel 5 is fed backward. When the passage sensor 93 detects that the angle steel 5 has been introduced into the straightening machine 16, the rollers 26, 28 and 30 are stopped and the cylinder 47 is extended.

  FIG. 11 is an explanatory diagram of the state in which the cylinder 47 is extended as described above. As described above, the axis of the cylinder 47 is directed obliquely downward to the left, and is inclined by a predetermined inclination angle θ with respect to the side of the first flange 6 that ideally extends horizontally left and right on the roller 28. Yes. The side of the second flange 7 ideally extends vertically upward with respect to the first flange 6, and the axis B of the cylinder 47 is an angle bisector formed by the first and second flanges 6, 7. It is inclined toward the first flange 6 with respect to A. Assuming such ideal conditions, the inclination angle θ is less than 45 degrees.

  The presser 72 is attached to the end of the cylinder 47 whose axis is inclined as described above, and the lower corner 86 is brought into contact with the inner corner 8 of the angle steel 5 as the cylinder 47 extends. A first pressing surface 87a extending substantially horizontally to the right with respect to the lower corner portion 86 is in contact with the inner surface of the first flange 6, and a second pressing surface 87b extending substantially vertically upward with respect to the lower corner portion 86 is the first. 2 Abuts against the inner surface of the flange 7.

  Since the cylinder 47 extends until the set extension amount is reached, the angle steel 5 is pressed by the pressing element 72. When this pressing force F is applied, the angle steel 5 is supported by the rollers 28 on the outer surface of the first flange 6, and the outer surface of the second flange 7 is supported by the support surfaces 52 of the pair of front and rear support members 46. The pressing force F acts on the angle steel 5 at the center position in the front-rear direction between the front and rear rollers 28 and at the center position in the front-rear direction between the pair of front and rear support members 46.

  The direction of action of the pressing force F is substantially parallel to the axis of the cylinder 47. For this reason, a force Fsinθ corresponding to the vertical component of the pressing force F acts on the first flange 6 from the first pressing surface 87a of the pressing element 72, and the horizontal force of the pressing force F from the second pressing surface 87b acts on the second flange 7. A component equivalent force Fcosθ acts. The first flange 6 is deformed downward based on the force acting on itself, and the second flange 7 is supported by the support member based on the force acting on itself. The middle part of the two points is deformed toward the left.

  Thus, in this straightening machine 16, since the axis of the cylinder 47 is inclined with respect to both the first and second flanges, it is possible to apply a pressing force from the pressing element 72 to both flanges 6 and 7. And both flanges can be deformed simultaneously. For this reason, the time required for correcting the bending of the angle steel 5 can be shortened, and the productivity of the angle steel 5 can be increased. Further, since the axis of the cylinder 47 is inclined toward the first flange 6, the force acting on the second flange 7 is larger than the force acting on the first flange 6. In the unequal side unequal thickness angle steel illustrated here, the bending of the second flange 7 is larger than that of the first flange 6, so that by applying a large force to the second flange 7, the bending of the two flanges 6, 7 is caused. At the same time, it becomes possible to correct efficiently.

  When the cylinder 47 extends to a predetermined extension amount, the cylinder 47 stops at that position for a predetermined time. The extension amount of the cylinder 47 is set such that the second flange 7 of the angle steel 5 is further deformed to the left with respect to the support surfaces 52 of the pair of support members 46. By stopping the cylinder 47 at such a position, the first and second flanges 6 and 7 can be reliably plastically deformed, and even if the cylinder contracts from that position, the first and second flanges 6 and 7 can be made. Is released from the pressing force F, the first flange 6 can be properly extended horizontally, and the second flange 7 can be properly extended vertically.

  Then, the controller 90 contracts the cylinder 47 and drives the rollers 26, 28, 30 to convey the angle steel 5 backward by the set intermittent feed amount, and then stops the rollers 26, 28, 30. When the rollers 26, 28, 30 are stopped, the cylinder 47 is driven as described above, and the first and second flanges 6, 7 are pressed by the pressing element 72 to be deformed. This series of operations is continuously executed until it is detected by the passage sensor 93 that the angle steel 5 has passed the straightening machine 16.

  When it is detected by the passage sensor 93 that the angle steel 5 has passed through the straightening machine 16, the angle steel 5 is sent to the correction rear surface table 17. The angle steel 5 on the straightened rear surface table 17 is straightened at both the first and second flanges 6 and 7. However, when the bend is confirmed finely, the initial bend may not be completely corrected, or the first and / or second flanges 6 and 7 may be bent excessively. If the initial bending of the second flange 7 is not completely corrected, the operator again sets the intermittent feed amount of the rollers 26, 28, 30, the extension amount of the cylinder 47, and the time for holding the cylinder 47 in the extended state. Set and press the start switch on the operation panel 91. Then, the rollers 26, 28, 30 rotate in the reverse direction, and the angle steel 5 is sent forward, and the intermittent drive of the rollers 26, 28, 30 and the drive of the cylinder 47 described above with reference to FIG. The second flange 7 is deformed outward to correct the original bending.

  When the second flange 7 is bent excessively, the operator holds the handle 58 and positions the auxiliary support member 48 in the operating position, and the intermittent feed amount of the rollers 26, 28, 30 on the operation panel 91, the auxiliary cylinder 49 The extension amount and the holding time when the auxiliary cylinder 49 is extended to the extension amount are input to the controller 90. When the operator depresses the start switch of the operation panel 91, the rollers 26, 28, and 30 are rotationally driven in the reverse direction, and the angle steel 5 is fed forward. When the passage sensor 93 detects that the angle steel 5 has been introduced into the straightening machine 16, the rollers 26, 28 and 30 are stopped and the auxiliary cylinder 49 is extended.

  When the bending of the first flange 6 is not completely corrected, the angle steel 5 mounted on the correction rear surface table 17 is driven by driving the rotation mechanism 31 (see FIG. 4) provided on the correction rear surface table 17. The second flange 7 is placed on the roller 30 so that the first flange 6 stands with respect to the roller 30 by rotating 90 degrees. Similarly to the above, the operator grips the handle 58 and positions the auxiliary support member 48 in the operating position. On the operation panel 91, the intermittent feed amount of the rollers 26, 28, 30, the extension amount of the auxiliary cylinder 49, and the auxiliary cylinder 49 are The holding time in the extended state to the extended amount is input to the controller 90, and the start switch of the operation panel 91 is pressed.

  FIG. 12 is an explanatory diagram of the state in which the auxiliary cylinder 49 is extended as described above. The axis of the auxiliary cylinder 49 is horizontally directed to the right as described above. For this reason, when the auxiliary cylinder 49 is extended, the front end surface 88 abuts against the inner surface of the first flange 6. Since the auxiliary cylinder 49 extends until the set extension amount is reached, the angle steel 5 is pressed by the auxiliary cylinder 49. When the pressing force F ′ acts on the angle steel 5 from the auxiliary cylinder 49, the outer surface of the first flange 6 is supported by the support surfaces 62 of the pair of front and rear auxiliary support members 48. This pressing force F ′ acts on the angle steel 5 at the center position in the front-rear direction between the pair of front and rear support members 48. The acting direction of the pressing force F ′ is substantially parallel to the axis of the auxiliary cylinder 49, and the first flange 6 is supported by the auxiliary support member 48 based on the force F ′ acting on the first flange 6. Deforms toward When the auxiliary cylinder 49 is extended to a predetermined extension amount, it stops at that position for a predetermined time. The extension amount of the auxiliary cylinder 49 is set such that the first flange 6 is further deformed to the right with respect to the support surfaces 62 of the pair of auxiliary support members 48. For this reason, the plastic deformation of the first flange 6 based on the pressing force F ′ can be reliably performed.

  Then, the controller 90 contracts the auxiliary cylinder 49, drives the rollers 26, 28, 30 to convey the angle steel 5 forward by a set intermittent feed amount, and then stops the rollers 26, 28, 30. When the rollers 26, 28, 30 are stopped, the auxiliary cylinder 49 is driven as described above, and the first flange 6 is pressed by the auxiliary cylinder 49 to be deformed. This series of operations is continuously executed until it is detected by the passage sensor 93 that the angle steel 5 has passed the straightening machine 16. In this way, even when the angle steel is excessively deformed relative to the original bend, or when the angle is not completely corrected, the angle steel can be corrected again so that the bend is properly eliminated.

  In addition, when the angle steel 5 is corrected while being conveyed forward in this way, the angle steel 5 is placed on the correction front table 15. The straightening front table 15 is also provided with a rotation mechanism 27 that allows the angle steel 5 to be rotated to select which of the first flange and the second flange is placed on the roller 26. By operating this, It is also possible to selectively re-correct one of the first and second flanges. Further, for example, when the angle steel is shipped from the corrected rear surface table 17 and there is a circumstance that it is convenient to place the first flange 6 on the roller 30, the angle steel is inverted after being reversed accordingly. Can be sent to the back table.

  The embodiment of the present invention described above is not limited to the above-described configuration, and can be appropriately changed within the scope of the present invention. In addition, the straightening machine 16 is beneficial when used for straightening angle irons produced by cutting groove steel, but may be used for straightening angle steels produced by rolling.

  As described above, the present invention has the effect that the time and cost required for correcting the bending of the angle steel can be reduced, and the productivity of the angle steel can be improved. It is beneficial to use it in the manufacture of

DESCRIPTION OF SYMBOLS 1 Channel steel 2 Web 5 Angle steel 6 1st flange 7 2nd flange 8 Inner corner 10 Angle-shaped steel manufacturing equipment 11 Rolling part 12 Cutting part 13 Correction part 14 Sorting table 15 Straightening front table 16 Straightening machine 17 Straightening rear surface table 26 28, 30 Roller 46 Support member 47 Cylinder 48 Auxiliary support member 49 Auxiliary cylinder 63 Cylinder fixing portion 72 Presser 73 Presser support structure 79 Auxiliary cylinder fixing portion 90 Controller

Claims (9)

A roller on which the first flange of the angle iron is placed, a pair of support members that support the outer surface of the second flange of the angle iron at two points apart in the longitudinal direction, and an angle between the pair of support members A cylinder that presses and deforms steel from the inside,
A pressing element is attached to the tip of the cylinder, and the pressing element extends on the inner surfaces of the first and second flanges by extending the cylinder in a direction inclined with respect to each of the first and second flanges. A bend straightening device for angle irons, characterized by being configured to press.   The curvature correcting device according to claim 1, wherein a radius of curvature of a portion of the pressing element that abuts against an inner corner of the angle iron is smaller than a radius of curvature of an inner corner of the angle steel.   The bending correction device according to claim 1, further comprising a pressing member supporting structure that supports the pressing member, wherein the pressing member is attached to be movable relative to a tip portion of the cylinder. .   The second flange is bent more than the first flange, and the axis of the cylinder is inclined closer to the first flange with respect to the bisector of the angle formed by the first flange and the second flange. The bending correction apparatus according to any one of claims 1 to 3, wherein the bending correction apparatus is provided.   The bend straightening device according to claim 4, wherein the side of the second flange is shorter than the side of the first flange.   The controller further includes a controller for controlling the operation of the roller and the cylinder, the controller intermittently drives the roller to convey the angle steel in the longitudinal direction by a predetermined length, and presses the angle steel while the roller is stopped. 6. The bending correction apparatus according to claim 1, wherein the bending correction apparatus is configured to drive the cylinder.   A pair of auxiliary support members that support the inner surface of the second flange at two points separated in the longitudinal direction thereof, and an auxiliary cylinder that plastically deforms the angle steel by pressing it from the outside between the pair of auxiliary support members. The bending correction apparatus according to any one of claims 1 to 6, further comprising: A rotation mechanism for changing the flange supported by the roller by rotating the angle steel, the second flange supported by the roller by the operation of the rotation mechanism, and the first flange standing from the roller age,
The bend straightening device according to claim 7, wherein the first flange supported by the pair of auxiliary support members is configured to be plastically deformable by being pressed from the inside by the auxiliary cylinder.   A grooved steel web is cut to form two angle irons, and the bend straightening device according to any one of claims 1 to 7 is operated to correct the angled steel bends. To manufacture angle steel.

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