JP2015047620A - Manufacturing method of u-shaped damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-accuracy and economical manufacturing method of a U-shaped damper in which bending processing can be applied to a long thick plate which is a material of a seismic isolation U-shaped damper by a simple apparatus accurately.SOLUTION: A long thick plate 10 being a material of a seismic isolation U-shaped damper is set on a horizontal processing surface 24 such that a plate thickness direction becomes parallel with the processing surface 24. In pressing a central part of the long thick plate 10 set on the processing surface 24 by a processing head 40 whose tip surface is curved along the processing surface 24 while two points on both sides sandwiching the central part are supported by support bodies 50,50 on a processing surface 25, the central part is fixed to a central part of a curved surface 41 of the processing head 40 by a clamp 60, and the central part is pressed by the processing head 40 in this state.

Description

  The present invention relates to a seismic isolation damper interposed between a foundation and a building on the foundation, and more particularly, to a method of manufacturing a U-shaped damper used for horizontal vibration absorption.

  In Japan, an earthquake-prone country, the development of seismic isolation devices intervening between the foundation and the building above it is progressing in order to prevent the collapse and damage of the building due to the earthquake. As one of the seismic isolation devices, there is a U-type damper used in combination with a seismic isolation isolator that absorbs vibration in the same direction while receiving a load in the vertical direction.

  This seismic isolation U-type damper is described in Patent Documents 1 to 3 and the like. Specifically, as shown in FIGS. 8A and 8B, a long thick plate made of a metal such as a steel material. It is U-shaped with 10 being curved in a semicircular shape at the center. Then, as shown in FIG. 8 (c), a pair of parallel flat plate portions 14 and 14 sandwiching the U-shaped curved portion 13 are set up in a two-level upper and lower posture, and a plurality of foundations and a construction thereon are provided. In addition to being arranged in a distributed manner, the tip portions of the lower parallel plate portions 14 are connected and fixed to the foundation side, and the tip portions of the upper parallel plate portions 14 are connected and fixed to the building side. As a result, the seismic isolation in the horizontal direction is mainly performed on the building on the foundation.

  That is, in the occurrence of an earthquake, the horizontal vibration of the building on the foundation is caused by the elastic displacement of the pair of upper and lower two parallel flat plate portions 14 and 14 in the U-shaped dampers in opposite directions in the longitudinal direction. Is suppressed.

  As a method for manufacturing such a seismic isolation U-shaped damper, it is considered simple and economical to bend a long thick plate in a cold manner. A forming bending process in which a U-shaped convex mold is pressed into a letter-shaped concave mold in a cold state has been put into practical use. However, in forming bending using a concave mold and a convex mold, there is a concern that processing accuracy may be lowered due to deviation or twist.

  As shown by A in FIG. 8 (c), the deviation is an unevenness in the longitudinal direction of the two upper and lower parallel plate portions 14 and 14 due to the bending portion 13 being displaced from the center portion of the long plate thickness 10. Further, the twisting is a state in which the two upper and lower parallel plate portions 14 and 14 are twisted sideways and do not become horizontal as indicated by B in FIG. 8C. All of these are factors that reduce the machining accuracy.

  In addition, since the U-shaped concave shape and the convex shape have a scale corresponding to the U-shaped damper which is a product, a processing apparatus becomes large, which causes a processing cost to be increased. Moreover, recently, since hard steel such as rolled steel for building structures is frequently used as the material of the long thick plate as a material, the parallel flat plate portion is inevitably opened by the spring back after processing. In forming bending using a concave mold and a convex mold, it is impossible to correct the opening of the parallel plate unless the material after bending is taken out of the mold. Therefore, this two-stage processing also increases the processing cost.

  Therefore, it is said that it is difficult to lower the product price due to the increased processing cost in the molding and bending method using the U-shaped concave mold and convex mold.

JP 02-194233 A JP 2004-011273 A JP 2006-152739 A

  An object of the present invention is to provide a highly accurate and economical U-shaped damper manufacturing method capable of accurately bending a long thick plate, which is a material of a seismic isolation U-shaped damper, with a simple device. Another object of the present invention is to provide an economical U-shaped damper manufacturing method that can easily correct deformation caused by springback after bending.

  In order to achieve the above object, the U-shaped damper manufacturing method of the present invention sets a long thick plate, which is a material of the seismic isolation U-type damper, on the processing surface so that the plate thickness direction is parallel to the processing surface. The first setting step, and two points sandwiching the central portion of the long thick plate set on the processing surface are supported by a support on the processing surface, and the central portion is processed by a processing head whose tip surface is curved. In pressing along the surface, the second setting step of fixing the central portion to the central portion of the curved surface of the processing head, and the state where the central portion of the long thick plate is fixed to the central portion of the curved surface of the processing head, And a three-point bending step of pressing the central portion of the long thick plate along the processing surface by the processing head on the processing surface.

  In the U-shaped damper manufacturing method of the present invention, a long thick plate that is a material of the seismic isolation U-shaped damper is basically subjected to a so-called three-point bending process on the processing surface along the processing surface. Compared to the forming process using the convex mold, the apparatus becomes simple and the processing cost is low. Moreover, since the center portion of the long thick plate is fixed to the center portion of the curved surface of the machining head during the three-point bending, the above-described misalignment does not occur, and the long length that causes a problem in the three-point bending The thick plate does not lift from the machining head, and the central portion of the long thick plate is in close contact with the curved surface of the machining head. In addition to the fact that the center of the long thick plate is fixed to the center of the curved surface of the processing head, the long thick plate is bent along the processing surface on the processing surface, so that twisting occurs. It is hard to do. Therefore, the machining accuracy is high, and the machining apparatus is simple and economical.

  In addition to this, since the material is exposed during and after bending, the parallel plate part of the material is moved inward along the processing surface from both sides with the material set on the processing surface after bending. Can be pushed into. This makes it possible to easily and economically correct the shortage of bending due to the spring back following the bending process.

  As a method for fixing the central part of the long thick plate to the central part of the curved surface of the machining head, the clamp is attached to the machining head and moves on the machining surface together with the machining head. From the viewpoint of sex.

  In addition, the support that supports the two points sandwiching the center of the long thick plate during three-point bending is characterized by a vertical roller that is rotatably supported on the processing surface by an axis perpendicular to the processing surface. To preferred.

  As for the processed surface, a horizontal surface is preferable from the viewpoints of material handling properties and workability on the processed surface.

  Since the U-shaped damper manufacturing method of the present invention is also an open system in which the material is exposed during and after bending as described above, the length of the material compared to the forming using a concave mold and a convex mold. The degree of freedom for increases. For this reason, regarding the long thick plate which is the material of the seismic isolation U-shaped damper, it is one of the features of the U-shaped damper manufacturing method of the present invention that the long thick plates having different lengths can be bent by the same apparatus. .

  In the U-shaped damper manufacturing method of the present invention, a long thick plate, which is a material of a seismic isolation U-shaped damper, is exposed on the processing surface without using a combination of a concave shape and a convex shape, and the central portion is By performing the three-point bending process while being fixed to the central portion of the curved surface of the processing head, it is possible to perform the processing with a simple apparatus with high accuracy, and therefore, both the processing accuracy and the economy are excellent.

  Since the material is exposed during and after the bending process, the parallel plate part of the material is turned inward along the processing surface from both sides with the material set on the processing surface after the bending process. If it is pushed in, the shortage of bending by the springback can be easily and economically compensated. In addition, since the degree of freedom of the material length is greater compared to molding using concave and convex molds, it is possible to bend long thick plates with different lengths over a wide range with the same equipment. Excellent in properties.

It is a top view of the bending apparatus used suitably for the U type damper manufacturing method of this invention. It is a front view of the bending apparatus, and is an XX arrow view in FIG. It is a side view of the bending apparatus. It is explanatory drawing of the U type damper manufacturing method using the bending apparatus, and is a side view of the head part vicinity which shows the process of fixing a long thick board to the front-end | tip of a process head in steps. It is explanatory drawing of the U type damper manufacturing method using the bending apparatus, and is a top view which shows a bending process in steps, and respond | corresponds to FIG. It is a top view which shows the same bending process in steps. It is a top view which shows the same bending process in steps. It is explanatory drawing of another U type damper manufacturing method using the bending apparatus, and is a top view corresponding to FIG. It is explanatory drawing of another U type damper manufacturing method using the bending apparatus, and is a top view corresponding to FIG. It is a schematic diagram which shows the process and use condition of the bending process in the U-shaped damper manufacturing method of this invention.

  Embodiments of the U-shaped damper manufacturing method of the present invention will be described in detail below.

  As shown in FIGS. 10A and 10B, the U-shaped damper manufacturing method of the present embodiment uses a long thick plate 10 that is set so that the plate thickness direction is horizontal on a horizontal processing surface. It is used to form a U-shaped damper 11 by being bent in a semicircular shape along the processing surface at the center in the direction. The long thick plate 10 has the same thickness over the entire length, the width is wide at both ends, and the width of the portion excluding both ends is gradually reduced toward the center. Both end portions are portions to be connected portions 12 and 12 to the foundation and the building on the foundation in the processed product (U-shaped damper 11), and have a plurality of screw holes 15 for the connection. .

  As shown in FIG. 10C, the U-shaped damper 11 which is a product after processing has a pair of parallel flat plate portions 14 and 14 extending from both ends of the bending portion 13 and connecting portions 12 and 12 following the pair. It is used to stand horizontally so as to form a horizontal two-stage structure, and the lower horizontal connecting portion 12 is bolted to the foundation side and the upper horizontal connecting portion 12 is bolted to the building side on the foundation. Therefore, it is used as a horizontal seismic isolation damper.

  As shown in FIGS. 1 to 3, the processing apparatus used for bending the U-shaped damper 11 is horizontally processed on a processing board 20 whose upper surface is a horizontal processing surface and a center line of the processing board 20. The cylinder 30 fixed to the rod 30, the machining head 40 attached to the tip of the rod 31 of the cylinder 30 and moving back and forth on the center line of the machining board 20, and bending the long thick plate 10 in three points in cooperation with the machining head 40. In order to achieve this, a pair of support bodies 50 and 50 installed on opposite sides of the center line on the processing board 20 and the central portion of the long thick plate 10 are fixed to the processing head 40 during the three-point bending. And a detachable clamp 60.

  The processing board 20 includes a rectangular main body 22 made of a metal plate horizontally supported on a gantry 21, and a pair of projecting portions 23, 23 projecting in a wing shape on both sides of the main body 22. The lateral width of the processing board 20 including the pair of protruding portions 23, 23 on both sides is set to be larger than the entire length of the long thick plate 10. The cylinder 30 is an air cylinder here, and is fixed on the center line of the main body 22 by a first fixing tool 32 at the rear and second fixing tools 33 and 33 on both sides of the front.

  The machining head 40 attached to the rod tip of the cylinder 30 is a substantially semicircular metal block whose tip surface is curved in an arc shape in plan view. The curvature radius of the curved surface 41 coincides with the bending radius of the central portion of the long thick plate 10. The processing head 40 is fixed from the center to the rear of the lower plate 42 that slides along the center line of the processing surface 24 on the upper surface of the processing board 20. The lower plate 42 is a slider, and has a convex rib 43 on the lower surface that fits into a concave guide groove 25 provided along the center line in the center portion of the processing surface 24.

  The lower plate 41 also serves as a mounting base for the clamp 60. That is, as shown in detail in FIGS. 4A to 4E, the clamp 60 is a fixing member 61 that is fixed on the front portion of the lower plate 42 with a clearance from the tip of the processing head 40. Between the fixing member 61 and the processing head 40, and a presser member 62 that is detachably interposed together with the long thick plate 10, and is stretched between the upper portion of the fixing member 61 and the rear portion of the processing head 40. And an upper plate 63 as a connecting and fixing member for connecting and fixing the two.

  The pressing member 62 is movable in the front-rear direction between the upper and lower plates 63 and 41 between the fixing member 61 and the long thick plate 10 disposed in front of the processing head 40. The central portion of the long thick plate 10 is pressed and fixed to the distal end portion of the curved surface 41 of the processing head 40 by being pressed backward by the screwed horizontal holding bolt 64. For this pressing and fixing, the upper plate 63 engages with the front part of the fixing member 61 and the rear part of the pressing head 40 from above and is detachable from both. The upper and lower surfaces of the pressing head 40 are provided with concave grooves 44 and 45 into which the upper plate 63 and the lower plate 42 are fitted, respectively.

  As described above, the pair of supports 50 and 50 on both sides for bending the long thick plate 10 at three points in cooperation with the processing head 40 are installed at symmetrical positions across the center line on the processing board 20. Specifically, it is a vertical roller rotatably supported by a bracket 51 attached to the processing board 20 by a vertical axis, and is more than the thickness of the long thick plate 10 from the tip position when the processing head 40 is most retracted. Is placed forward.

  The interval (width of the gap) between the supports 50 and 50 made of vertical rollers is wider than the maximum lateral width of the processing head 40, and more specifically, corresponds to the thickness of the long thick plate 10 on both sides of the maximum lateral width. It is the size which secured the gap to do. As a result, when the long thick plate 10 is sandwiched between the processing head 40 and the supports 50, 50 in front of the processing head 40, the retreat limit of the processing head 40 advances, so that the long thick plate 10 is attached to both sides. While being supported by the supports 50, 50, it passes between the supports 50, 50 on both sides together with the processing head 40.

  Next, a procedure for performing the U-shaped damper manufacturing method of the present embodiment using the above-described processing apparatus will be described step by step based on FIGS. 4 (a) to 4 (e) and FIGS. To do.

  Before bending the long thick plate 10, as shown in FIG. 4 (a), the horizontal holding bolt 64 screwed into the central portion of the fixing member 61 of the clamp 60 is loosened, The holding member 62 is removed. When bending the long thick plate 10, first, as shown in FIG. 4B, the long thick plate 10 is set in front of the processing head 40 on the lower plate 41. Specifically, the long thick plate 10 is laid sideways so that the plate thickness direction thereof is horizontal, and the center of the longitudinal direction is in contact with the tip of the curved surface of the processing head 40, so Set on a rough machining surface 24. Since the long thick plate 10 set on the processing surface 24 has the rectangular connecting portions 12 and 12 at both ends, the long thick plate 10 is in the posture of standing vertically and horizontally.

  When the long thick plate 10 is set in front of the processing head 40, as shown in FIG. 4 (c), the pressing member 62 is interposed between the central portion of the long thick plate 10 and the fixing member 61 in front thereof. Then, as shown in FIG. 5 (d), the upper plate 63 is set from above the fixing member 61 to the machining head 40, and is screwed to these. As a result, the fixing member 61 is firmly connected to the machining head 40 by the upper and lower plates 61 and 41. And as shown in FIG.4 (e), by hold | suppressing the holding | suppressing volt | bolt 64 screwed together to the center part of the fixing member 61, the holding | suppressing member 62 is pressed against the center part of the elongate thick board 10, and long length The central portion of the plate 10 is fixed to the tip portion of the curved surface 41 of the processing head 40.

  The above is the clamping process prior to bending. When the clamping process is completed, the cylinder 30 is operated to advance the machining head 40 as shown in FIGS. As a result, the long thick plate 10 is subjected to a three-point bending process by pressing the central portion against the curved surface 41 of the processing head 40 while being supported by the support bodies 50, 50 composed of vertical rolls on both sides. At the stage where the head 40 has moved to the forward limit, the central portion is curved along the curved surface of the machining head 40 to form the U-shaped damper 11.

  In this bending process, the long thick plate 10 as a raw material lies on the horizontal processing surface 24 of the processing board 20 while standing in the horizontal direction, that is, in the horizontal direction. Rectangular connecting portions 12, 12 existing at both ends of the long thick plate 10 are guided to a horizontal processing surface 24. For this reason, compared with the formation process by a concave type and a convex type, the long thick plate 10 is stably three-point bent despite using a simple processing device.

  In addition, the long thick plate 10 subjected to the bending process is fixed at the center portion to the tip end portion of the curved surface 41 of the processing head 40 by the clamp 60, and the processing head 40 and the center of the processing surface 24 together with the clamp 60. Since it moves straight along the concave guide groove 25 provided in the part, there is no positional displacement in the longitudinal direction, and the connecting parts 12 and 12 continue to be guided to the horizontal processing surface 24 until the end of the bending process. Does not occur. For this reason, unevenness and twist of the parallel flat plate portions 14 and 14 of the manufactured U-shaped damper 11 do not occur.

  When the parallel flat plate portions 14 and 14 of the U-shaped damper 11 are opened by the spring back after bending by the material constituting the long thick plate 10, the processing head 40 is as far as possible behind the processing head 40 moved to the forward limit. At a close position (for example, a position indicated by C or C in FIG. 7), the parallel plate portions 14 and 14 are pushed inward along the processing surface 24 from both sides by another processing head. This makes it possible to easily and economically correct the shortage of bending due to the springback within the same process as the bending process.

  8 and 9 show a U-shaped damper manufacturing method according to another embodiment using the above-described processing apparatus. The difference between these U-shaped damper manufacturing methods and the above-described U-type damper manufacturing method is the length of the long thick plate 10 that is a material. Compared to the U-type damper manufacturing method described above, FIG. In the order of 9, the length of the long thick plate 10 is increased. As a result, the lengths of the parallel flat plate portions 14 and 14 of the U-shaped damper 11 after processing become longer in this order. The reason why such a wide variety of processing is possible with the same bending apparatus is that the processing of the long thick plate 10 is an open-type bending process performed on the horizontal processing surface 24 of the processing board 20. is there.

DESCRIPTION OF SYMBOLS 10 Long thick plate 11 U-shaped damper 12 Connection part 13 Curved part 14 Parallel flat plate part 15 Screw hole 20 Processing board 21 Base 22 Main body 23 Overhang part 24 Processing surface 25 Guide groove 30 Cylinder 31 Rod 32 1st fixing tool 33 2nd Fixed part 40 Processing head 41 Curved surface 42 Lower plate 43 Convex rib 50 Support (vertical roller)
51 Bracket 60 Clamp 61 Fixing member 62 Holding member 63 Upper plate 64 Holding bolt

Claims (6)

A first setting step of setting a long thick plate, which is a material of the seismic isolation U-type damper, on the processing surface so that the thickness direction is parallel to the processing surface;
When pressing the central portion along the processing surface by a processing head having a curved end surface while supporting two points sandwiching the central portion of the long thick plate set on the processing surface by a support on the processing surface. A second setting step for fixing the central portion to the central portion of the curved surface of the machining head;
A three-point bending step of pressing the central portion of the long thick plate along the processing surface by the processing head on the processing surface in a state where the central portion of the long thick plate is fixed to the central portion of the curved surface of the processing head. Including U-shaped damper manufacturing method.   2. The U-shaped damper manufacturing method according to claim 1, wherein the central portion of the long thick plate is fixed to the central portion of the curved surface of the processing head by a clamp that is mounted on the processing head and moves on the processing surface together with the processing head. Mold damper manufacturing method.   3. The U-shaped damper manufacturing method according to claim 1, wherein the parallel plate portion of the material is pushed inward along the processing surface from both sides while the material is set on the processing surface after the three-point bending process. Mold damper manufacturing method.   4. The U-shaped damper manufacturing method according to claim 1, wherein the machining surface is a horizontal plane.   The U-shaped damper manufacturing method according to any one of claims 1 to 4, wherein the support body that supports two points sandwiching the central portion of the long thick plate during three-point bending is processed by an axis perpendicular to the processing surface. A U-shaped damper manufacturing method, which is a vertical roller rotatably supported on a surface. The U-shaped damper manufacturing method according to any one of claims 1 to 5, wherein a plurality of types of long thick plates having different lengths are bent by the same apparatus.

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