JP5345888B2 - Method for manufacturing seismic isolation plug for seismic isolation device and manufacturing apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a base isolation plug capable of enhancing damping performance and displacement followability of a base isolation device, without using lead as a material, and a device for manufacturing the base isolation plug capable of carrying out the manufacturing method. <P>SOLUTION: In this manufacturing method, a powder material 2 is press-molded into a shape recessed in the central part, compared with the peripheral part thereof, when molding the base isolation plug 6 for the base isolation device 8, by press-molding the powder material 2 filled in a molding die 3, and then press-molds a pressure reception face 7 of the press-molded powder material 2 into a planar shape orthogonal to a pressing direction. The base isolation plug 6 is manufactured using the manufacturing method. The manufacturing device is provided with the molding die 3 and a stamper 5 for carrying out the manufacturing method. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a method for manufacturing a seismic isolation plug capable of improving the damping performance and displacement followability of a seismic isolation device, and a manufacturing apparatus for implementing such a manufacturing method.

  2. Description of the Related Art Conventionally, seismic isolation structures in which soft plates having viscoelastic properties such as rubber and hard plates such as steel plates are alternately stacked have been used as bearings for seismic isolation devices. Among such seismic isolation structures, for example, there is a structure in which a hollow portion is formed at the center of a laminate made of a soft plate and a hard plate, and a seismic isolation plug is press-fitted into the hollow portion.

  The seismic isolation plug is often made of lead as a whole, and when the laminated body undergoes shear deformation due to the occurrence of an earthquake, the seismic isolation plug plastically deforms to reduce vibration energy. Absorb. However, lead has a large environmental load and a high cost for disposal. Therefore, the development of a seismic isolation plug having sufficient damping performance, displacement followability and the like has been attempted even when a lead substitute material is used.

  For example, Patent Document 1 discloses a powder material in which a hollow portion of a laminate is made of a plastic fluid material and a hard filler instead of a lead seismic isolation plug, and a gap between the hard fillers is filled with the plastic fluid material. A seismic isolation device in which is enclosed is proposed. Such a seismic isolation plug, like a lead seismic isolation plug, ensures stable damping performance and displacement follow-up even during long-term use. Examples of the plastic fluid material include natural rubber and acrylic rubber, and examples of the hard filler include metal powder such as stainless steel powder and iron powder. Such a seismic isolation plug is manufactured by press-molding a powder material filled in a mold at a predetermined surface pressure with a stamper having a flat pressure surface perpendicular to the pressing direction.

JP 2006-316990 A

  Although the seismic isolation device including the seismic isolation plug described in Patent Document 1 has stable damping characteristics and displacement followability for a long time without using a seismic isolation plug made of lead, construction in recent years Against the background of the increase in size and height of objects, further improvement in the performance of the seismic isolation device is required. For this reason, further improvement in the damping characteristics and displacement followability of the seismic isolation device is desired. Patent Document 1 also mentions a method for manufacturing this seismic isolation plug, but it does not leave the range of a general powder material pressure forming method.

  Therefore, the object of the present invention is to improve the manufacturing method of the seismic isolation plug that has not been sufficiently focused and studied so far, so that the damping performance and displacement tracking of the seismic isolation device can be achieved without using lead as a material. It is an object of the present invention to provide a method for advantageously manufacturing a seismic isolation plug capable of further improving the performance. A further object of the present invention is to provide an apparatus for manufacturing a seismic isolation plug capable of implementing such a manufacturing method.

  In order to achieve the above-mentioned object, the first invention is to perform pressure molding on a powder material filled in a mold to form a seismic isolation plug for a seismic isolation device. In contrast, the present invention provides a method for manufacturing a seismic isolation plug, which is formed by pressure-molding into a shape in which a central portion is depressed, and then pressure-molding the pressure-receiving surface of the pressure-molded powder material into a flat shape.

  In the first invention, the pressure receiving surface of the powder material preferably has a cone shape. Here, the “conical shape” means a shape including a conical shape or a pyramid shape.

  Furthermore, in the first invention, it is preferable to perform pressure molding by sandwiching the powder material from two directions.

  Furthermore, in the first invention, the powder material is preferably made of a plastic fluidized material and a hard filler.

A second invention relates to a seismic isolation plug manufacturing apparatus for a seismic isolation device comprising a mold filled with a powder material and a plurality of stampers for pressing the powder material in the mold. The stamper includes an inclined stamper having a pressurizing surface in which the central portion of the stamper protrudes from the outer peripheral portion, and a flat stamper having a flat pressurizing surface orthogonal to the pressurizing direction. This is a plug manufacturing apparatus.

In the second invention, the pressure surface of the inclined stamper preferably has a cone shape.

Furthermore, in the second invention, the stamper is preferably a pair of opposed stampers. At this time, it is preferable that the pressing surfaces of the pair of stampers facing each other have a point-symmetric shape. The “point-symmetrical shape” herein refers to a point-symmetrical shape that is a position on the axial line of the stamper and that is centered on an intermediate position (midpoint) between the opposing pressing surfaces.

  According to the present invention, when a powder material that is an alternative material for lead is used and pressure-molded, the flow of the powder material is forced particularly on the mold side. A small molded product can be obtained. Therefore, it is possible to provide a seismic isolation plug that greatly contributes to the improvement of the damping performance and displacement followability of the seismic isolation device. In addition, it is possible to provide a manufacturing apparatus suitable for manufacturing a seismic isolation plug having a small air content.

(A)-(f) is the figure which showed the manufacturing process of the seismic isolation plug according to this invention. (A) is a top view of the seismic isolation apparatus which press-fit the seismic isolation plug manufactured according to this invention, (b) is sectional drawing of this seismic isolation apparatus. (A) is the figure which showed the mutual arrangement | positioning of the hard filler of the powder material which is not fully compressed, (b) shows the mutual arrangement | positioning of the hard filler of the powder material which was fully compressed. It is a figure. (A)-(c) is the figure which showed the stamper which has the pressurization surface of various shapes used in the manufacturing process of the other seismic isolation plug according to this invention. (A)-(f) is the figure which showed the manufacturing process of the other seismic isolation plug according to this invention.

  Next, embodiments of the present invention will be described with reference to the drawings. FIGS. 1A to 1F are views showing a manufacturing process of the seismic isolation plug according to the present embodiment. FIG. 2A is a top view of the seismic isolation device in which the seismic isolation plug manufactured according to the present embodiment is press-fitted, and FIG. 2B is a cross-sectional view of the seismic isolation device. FIG. 3 (a) is a diagram showing the mutual arrangement of hard fillers of powder material that is not sufficiently compressed, and FIG. 3 (b) is an illustration of hard fillers of powder material that is sufficiently compressed. It is the figure which showed mutual arrangement | positioning. FIGS. 4A to 4C are views showing stampers having pressurizing surfaces of various shapes used in the manufacturing process of other seismic isolation plugs according to the present embodiment. FIG. 5A to FIG. 5F are diagrams showing manufacturing steps of other seismic isolation plugs according to the present embodiment.

  As shown in FIG. 1, a seismic isolation plug manufacturing apparatus 1 according to the present embodiment includes a cylindrical mold 3 filled with a powder material 2 composed of a plastic fluid A and a hard filler B, and the mold. Two stampers 5a and 5b having pressurizing surfaces 4a and 4b for pressing the powder material 2 in the mold 3 are provided. First, the stamper 5a shown in FIGS. 1 (a) to 1 (c) is an inclined stamper 5a having a conical-shaped pressurizing surface 4a whose central portion protrudes in the pressurizing direction from the outer peripheral portion. Further, another stamper 5b shown in FIGS. 1D to 1E is a flat stamper 5b having a flat pressing surface 4b orthogonal to the pressing direction. Using such a manufacturing apparatus, as shown in the manufacturing steps of FIGS. 1A to 1F, the powder material 2 filled in the mold 3 is sequentially pressed by the inclined stamper 5a and the flat stamper 5b. The seismic isolation plug 6 for the seismic isolation device is formed by Details will be described below.

  First, as shown in FIG. 1 (a), a mold 3 is filled with a powder material 2 composed of a plastic fluid A and a hard filler B, which are materials for the seismic isolation plug 6. Next, as shown in FIG. 1 (b), the inclined stamper 5 a is moved in the direction of the arrow, and the powder material 2 is pressure-molded by the cone-shaped pressure surface 4 a, and the pressure-receiving surface 7 of the powder material 2. The shape is deformed into a conical shape that is depressed in the central portion as compared with the peripheral portion on the mold side. Next, as shown in FIG. 1 (c), the inclined stamper 5a is pulled up in a direction opposite to the pressing direction of the inclined stamper 5a, and then the inclined stamper 5a is orthogonal to the pressing direction as shown in FIG. 1 (d). It replaces with a flat stamper 5b having a flat pressing surface 4b. Next, as shown in FIG. 1 (e), the flat stamper 5b is moved in the direction of the arrow, and the pressure receiving surface 7 of the powder material 2 is pressure-formed by the pressing surface 4b of the flat stamper 5b. The shape of the pressure receiving surface 7 of the material 2 is a planar shape. In this pressurizing step, the deformation amount of the peripheral portion 7a on the pressure receiving surface 7 is particularly large, so that the flow of the powder material 2 on the mold 3 side is strongly encouraged. 6 is obtained. And the seismic isolation plug 6 pressure-molded in this way is extracted from the mold 3 and used for press-fitting into the seismic isolation device 8 as shown in FIG. As such a seismic isolation device 8, for example, as shown in FIGS. 2 (a) and 2 (b), a laminated body in which rubber plates and steel plates are alternately laminated is provided, and a seismic isolation plug is arranged in the center of the device. There is a seismic isolation device 8 having a structure.

In general, it is effective to reduce the air content in the plug in order to improve the damping performance and displacement followability of the seismic isolation plug. However, when the powder material includes a plastic fluid material having viscosity such as rubber, the fluidity of the powder material is lowered, and the air in the powder material is difficult to escape. In the conventional method of manufacturing a seismic isolation plug, since the powder material was pressed at a predetermined surface pressure with a stamper having a flat pressing surface perpendicular to the pressing direction, the seismic isolation plug was molded. The further away from the surface, the smaller the compressive force applied to the powder material. As a result, the air content of the powder material increases as the distance from the pressure receiving surface increases. Further, due to the friction between the powder material and the wall surface of the mold, the movement of the powder material on the mold side is restricted, and the flow of the powder material is suppressed. For this reason, the powder material on the mold side is not sufficiently compressed even when pressed by a stamper, and the air content of the powder material increases as it approaches the wall surface of the mold. That is, the mutual arrangement of the powder materials does not flow sufficiently, so that the gap between the powder materials is large and the air tends to remain as shown in FIG. It was. From this, the inventor promoted the flow of the powder material on the mold side, made the gap between the powder materials small, and the air as shown in FIG. It has been found that the air content of the seismic isolation plug can be reduced by dense arrangement.
As a means for promoting the flow of powder material on the mold side and reducing the air content of the seismic isolation plug, the above manufacturing method was adopted. When the powder material 2 is pressure-molded by the process as described above, mainly the flow of the powder material 2 on the mold side is promoted, and the gap between the powder materials 2 is reduced. The arrangement is as shown in FIG. As a result, the air content of the seismic isolation plug 6 is reduced, and the seismic isolation device in which the seismic isolation plug 6 is press-fit improves both the damping performance and the displacement follow-up performance. Note that the shape of the pressing surface 4 of the stamper 5 is not particularly limited as long as the central portion protrudes in the pressing direction from the outer peripheral portion. For example, as shown in FIG. In addition, the pressurizing surface 4a may be hemispherical, or as shown in FIGS. 4B and 4C, the pressurizing surface 4 may have a stepped shape that gradually decreases in diameter toward the tip. Is possible.

  The substances contained in the plastic fluid A constituting the powder material 2 include elastomer components (such as natural rubber, polybutadiene rubber, acrylic rubber, silicon rubber, polyurethane, urethane elastomer), (rosin resin, phenol resin). Resin), carbon black, plasticizers (such as phthalic acid, maleic acid, citric acid), softening materials (such as castor oil, linseed oil, rapeseed oil), and the like. The substance contained in the hard filler B includes metal powder such as copper powder, stainless steel powder, zirconium powder, tungsten powder, bronze powder, aluminum powder, nickel powder, molybdenum powder, titanium powder, iron powder, and metal. Compounds. In addition, the composition of the material selected about each of the plastic fluid material A and the hard filler B, a content rate, a combination, etc. can be suitably changed according to the performance desired for the seismic isolation plug 6. Moreover, the powder material 2 is not limited to the structure which consists of the plastic fluidity material A and the hard filler B, and it is also possible to apply other various powder materials 2.

  Further, as shown in the manufacturing process of FIG. 5, the powder material 2 is formed using a pair of opposing stampers (in the illustrated example, a combination of inclined stampers 5a and 5a ′ and a combination of flat stampers 5b and 5b ′). It is preferable to perform pressure molding from two directions so as to sandwich the film. As shown in FIGS. 5A to 5C, a pair of inclined stampers 5a facing each other having cone-shaped pressurizing surfaces 4a and 4a ′ whose central portions protrude in the pressurizing direction from the outer peripheral portion. When the powder material 2 is pressed from two directions using 5'a, the powder material 2 is pressed compared to the case where the powder material 2 is pressed from one direction by a single inclined stamper 5a as shown in FIG. Since the pressure is efficiently applied to 2, the air content of the powder material 2 can be further reduced. Next, as shown in FIGS. 5D to 5E, each of the flat pressing surfaces 4b and 4b ′ perpendicular to the pressing direction is used, and a pair of opposing flat stampers 5b and 5b ′ are used. By pressing the powder material 2, the flow of the powder material 2 on the mold side is further increased as compared with the case where the powder material 2 is pressed from one direction by a single flat stamper 5b as shown in FIG. In addition, since the shape of the pressure receiving surface 7 of the powder material 2 is formed into a flat shape, it is possible to manufacture the seismic isolation plug 6 (FIG. 5 (f)) having an even smaller air content. The seismic isolation device 8 including the seismic isolation plug 6 further improves the damping performance and the displacement followability. In addition, as shown in FIG. 1, the time required to obtain the desired air content of the powder material is shortened by applying pressure from a plurality of directions rather than applying pressure from one direction. Productivity can be improved.

  A plurality of stampers 5 having differently shaped pressing surfaces 4 are arranged in parallel, the mold 3 is moved along this row, and the powder material 2 is sequentially pressure-formed using the plurality of stampers 5. Thus, it is possible to obtain an apparatus configuration for manufacturing the seismic isolation plug 6. Or, conversely, the position of the mold 3 is fixed, the parallel stampers 5 are sequentially moved, and the powder material 2 is continuously pressure-molded by using the stampers 5, thereby providing a seismic isolation plug. It is also possible to adopt an apparatus configuration that manufactures 6. The latter apparatus configuration is preferable from the viewpoint of space saving.

  Note that the above description shows only a part of the embodiment of the present invention, and these configurations can be combined with each other or various modifications can be made without departing from the gist of the present invention. . For example, in the illustrated example, the seismic isolation plug 6 is manufactured by compressing and deforming the pressure-receiving surface 7 of the powder material 2 into different shapes twice, but this compression process is further repeated according to the desired air content. It is also possible to implement.

Next, the seismic isolation plug (Comparative Example seismic isolation plug) that was prepared using the planar stamper disclosed in Patent Document 1, and seismic isolation manufactured by using the manufacturing method of the present invention according to the place shown in FIG. 5 Plugs (example seismic isolation plugs) were prototyped and their performance was evaluated, which will be described below.

The comparative example seismic isolation plug was manufactured by the method described below. First, a powder material made of a plastic fluid material and a hard filler having a calculated specific gravity of 5.536 g / cm ³ and having the composition shown in Table 1 was filled into a cylindrical mold having an inner diameter of 43.6 mm. Then, the powder material was manufactured by pressurizing and deforming the powder material at a surface pressure of 88.2 MPa using a flat stamper having a flat pressure surface perpendicular to the pressing direction of the stamper. In addition, the diameter of the seismic isolation plug manufactured in this way is 43.6 mm, and the height is 56.7 mm. The air content of the manufactured seismic isolation plug was calculated from the actual specific gravity of the manufactured seismic isolation plug relative to the calculated specific gravity of the powder material filled in the mold.

Moreover, the example seismic isolation plug was manufactured by the method demonstrated below. First, a powder material made of a plastic fluid material and a hard filler having a calculated specific gravity of 5.536 g / cm ³ and having the composition shown in Table 1 is filled into a cylindrical mold having an inner diameter of 43.6 mm. . Next, as shown in FIG. 5 (b), there are inclined stampers each having a cone-shaped pressurizing surface that is inclined at 60 ° with respect to the axial direction of the stamper with the axial line of the stamper as a center. These powder materials are sandwiched with a surface pressure of 44.1 MPa (combined with 88.2 MPa) by each stamper and are subjected to pressure deformation. Next, the inclined stamper is replaced with a flat stamper having a flat pressing surface orthogonal to the pressing direction, and the powder material is pressed using the flat stamper to flatten the pressure receiving surface of the powder material. Manufactured with. In addition, the diameter of the seismic isolation plug manufactured in this way is 43.6 mm, and the height is 55.7 mm. The air content of the manufactured seismic isolation plug was calculated from the actual specific gravity of the manufactured seismic isolation plug relative to the calculated specific gravity of the powder material filled in the mold.

* 1 (natural rubber)
Unvulcanized, RSS # 4
* 2 (Polybutadiene rubber (low cis))
Unvulcanized, Asahi Kasei "Diene NF35R"
* 3 Carbon Black ISAF, Tokai Carbon "Seast 6P"
* 4 Resins “Zeofine” manufactured by Nippon Zeon, “Nisseki Neopolymer 140” manufactured by Nippon Petrochemical Co., Ltd. “Marcaretz M-890A” manufactured by Maruzen Petrochemical, “Zeofine”: “Nisseki Neopolymer 140”: “Marcaretz M-” 890A "= 40: 40: 20 (mass ratio)
* 5 Plasticizer Dioctyl adipate (DOA)
* 6 Other compounding agents Zinc white, stearic acid, anti-aging agent [“Anstage 6C” manufactured by Sumitomo Chemical, wax [“Proto Wax 1” manufactured by Nippon Oil Corporation], zinc white: stearic acid: anti-aging agent: wax = 4: 5: 3: 1 (mass ratio)

As a result, the actual specific gravity of the conventional seismic isolation plug was 5.009 g / cm ³ and its air content was 9.5%, whereas the actual specific gravity of the seismic isolation plug of the example was 5.098 g. / Cm ³ , and the air content was as low as 7.9%.

  As is apparent from the above description, according to the present invention, a method for manufacturing a seismic isolation plug that can improve the damping performance and displacement followability of the seismic isolation device without using lead as a material, and such a manufacturing method are implemented. It has become possible to provide a seismic isolation plug manufacturing device.

DESCRIPTION OF SYMBOLS 1 Seismic isolation plug manufacturing apparatus 2 Powder material 3 Mold 4, 4a, 4a ', 4b, 4b' Pressure surface 5 Stamper 5a, 5a 'Inclined stamper 5b, 5b' Planar stamper 6 Seismic isolation plug 7 Pressure receiving surface 7a Pressure receiving Surface periphery 8 Seismic isolation device A Plastic fluid material B Hard filler

Claims (8)

  When forming a seismic isolation plug for a seismic isolation device by performing pressure molding on the powder material filled in the mold, the powder material is pressure molded into a shape in which the central part is depressed compared to the peripheral part. Then, a method for manufacturing a seismic isolation plug, wherein the pressure-receiving surface of the pressure-formed powder material is pressed into a flat shape.   The seismic isolation plug manufacturing method according to claim 1, wherein the pressure receiving surface of the powder material has a cone shape.   The manufacturing method of the seismic isolation plug of Claim 1 or 2 which press-molds by pressing the said powder material from two directions.   The said powder material is a manufacturing method of the seismic isolation plug as described in any one of Claims 1-3 which consists of a plastic fluid material and a hard filler. In a seismic isolation plug manufacturing apparatus for a seismic isolation device comprising a mold filled with a powder material, and a plurality of stampers for press-molding the powder material in the mold,
The plurality of stampers include an inclined stamper having a pressurizing surface in which a central portion of the stamper protrudes from an outer peripheral portion, and a planar stamper having a flat pressurizing surface orthogonal to the pressurizing direction. Seismic isolation plug manufacturing equipment. The seismic isolation plug manufacturing apparatus according to claim 5 , wherein the pressing surface of the inclined stamper has a cone shape. The said stamper is a manufacturing apparatus of the seismic isolation plug of Claim 5 or 6 which is a pair of stamper which opposes. The seismic isolation plug manufacturing apparatus according to claim 7 , wherein the pressing surfaces of the pair of stampers facing each other have a point-symmetric shape.

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