JP2014004739A - Method and apparatus for manufacturing base isolation plug and base isolation plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for manufacturing a base isolation plug which can manufacture a base isolation plug having a low air content while suppressing the occurrence of molding failure, and to provide a base isolation plug which has a flat end surface, has a low air content, and is excellent in damping performance and displacement following performance.SOLUTION: A method for manufacturing the base isolation plug includes: a preliminary pressure molding step of pressurizing at least one side of a powder material filled into a mold by using a concave pusher having a pressure surface in which a central part is sunk to a pressure-direction tip end in a direction opposite to the pressure direction; and a final pressure molding step of pressurizing at least the side, pressurized by the concave pusher, of the powder material pressurized in the preliminary pressure molding step by using a flat pusher having a flat surface orthogonal to the pressure direction as a pressure surface. The concave pusher has a ratio of a pusher axial direction length of the pressure surface to a pusher external diameter of less than 0.5. A base isolation plug is manufactured by a manufacturing apparatus suitable for the manufacturing method and by the manufacturing method.

Description

  The present invention relates to a method for manufacturing a seismic isolation plug for a seismic isolation structure used as a support for a seismic isolation device, a manufacturing apparatus therefor, and a seismic isolation plug.

  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. In such a seismic isolation structure, for example, a hollow portion is formed at the center of a laminate composed of a soft plate and a hard plate, and the hollow portion is molded so as to have a uniform composition. Some plugs are pressed.

  Here, the plug that is press-fitted into the laminate composed of the soft plate and the hard plate absorbs vibration energy by plastic deformation when the laminate undergoes shear deformation in response to the occurrence of an earthquake. As the plug, a plug made entirely of lead is often used. However, lead has a large environmental load and a high cost for disposal. Therefore, in recent years, an attempt has been made to develop a seismic isolation plug having sufficient damping performance, displacement followability, etc., using a lead substitute material.

  Specifically, as a seismic isolation plug using an alternative material for lead, a seismic isolation plug formed by pressure molding a powder material containing a plastic fluid material such as rubber and a hard filler such as metal powder. Has been proposed (see, for example, Patent Document 1).

  Here, when manufacturing a seismic isolation plug by pressing a powder material containing a plastic fluid and a hard filler, the powder material put into the mold is usually placed in the pressing direction. A seismic isolation plug is manufactured by applying pressure with a plane pusher having an orthogonal plane as a pressing surface. However, since powder materials including plastic fluid materials have low fluidity, when a seismic isolation plug is manufactured using only a flat pusher, the powder material does not flow sufficiently in the mold at the time of pressure molding. In some cases, air mixed in the body material does not sufficiently escape and the air content of the seismic isolation plug increases, so that desired damping performance, displacement followability, and the like cannot be obtained.

  Therefore, it is possible to forcibly flow the powder material in the mold during pressure molding to remove the air mixed in the powder material, and to obtain the desired damping performance and displacement followability with a low air content. As a method of manufacturing a seismic isolation plug that can be used, a method of using a pusher having a pressing surface whose outer peripheral portion protrudes in the pressing direction from the central portion has been proposed. (For example, refer to Patent Document 2). Specifically, a mortar-shaped pusher having a pressurizing surface made of a conical depression or a wedge-groove pusher having two flat surfaces intersecting at the bottom located inward from the forefront of the pressing direction as a pressing surface After pressing the powder material in the cylindrical mold into a shape with a protruding central part, the powder material that has been pressed into a shape with a protruding central part is pressed again with a flat pusher. A method of manufacturing a cylindrical seismic isolation plug has been proposed. And, according to this method of manufacturing a seismic isolation plug, the powder material that has been pressure-molded into a shape in which the central portion protrudes using a mortar-shaped or wedge-shaped pusher is pressure-molded again with a flat pusher. The flow of the powder material is promoted, and the air in the powder material is released, so that a seismic isolation plug having a low air content can be obtained.

JP 2006-316990 A JP 2010-221679 A

  However, in the conventional method of manufacturing a seismic isolation plug using a mortar-shaped pusher or a wedge groove type pusher, the powder material that has been press-molded into a shape with a protruding central portion is pressure-molded again with a flat pusher and is seismically isolated. Since both ends of the plug are pressure-molded into a flat shape, the outer peripheral portion of the end face of the manufactured seismic isolation plug sometimes collapses (is missing). That is, in the conventional seismic isolation plug manufacturing method using a mortar type pusher or a wedge groove type pusher, the end face of the seismic isolation plug is not flat, and molding failure occurs, and the desired damping performance and displacement followability are obtained. In some cases, seismic isolation plugs could not be obtained. Moreover, the manufacturing method of the seismic isolation plug using the conventional mortar type pusher and the wedge groove type pusher has room for improvement in that the air content is further reduced.

  Then, an object of this invention is to provide the manufacturing method and manufacturing apparatus of a seismic isolation plug which can manufacture a seismic isolation plug with a low air content rate, suppressing generation | occurrence | production of a shaping | molding defect. Another object of the present invention is to provide a seismic isolation plug having a flat end face and a low air content, and excellent damping performance and displacement followability.

  The present inventor has intensively studied for the purpose of manufacturing a seismic isolation plug having a low air content while suppressing the occurrence of molding defects. The present inventor determined that the shape of the powder material before being pressed by the flat pusher, in particular, the size of the protruding portion of the powder material (the protruding height of the central portion) is the outer periphery of the end face of the seismic isolation plug. The present invention has been completed by finding out that it has a great influence on the occurrence of breakage (chips) and the air content of the seismic isolation plug.

That is, the present invention aims to advantageously solve the above-mentioned problems, and the method for manufacturing a seismic isolation plug according to the present invention includes a powder material containing a plastic fluid and a hard filler in a mold. To produce a seismic isolation plug for a seismic isolation structure in which at least one side of the powder material filled in the mold is added to the center in the pressing direction. A pre-pressing step of pressing using a concave pusher having a pressing surface recessed in a direction opposite to the pressing direction, and at least the concave pusher of the powder material pressed in the pre-pressing step A final pressure forming step of pressing a side pressed using a flat pusher having a plane perpendicular to the pressing direction as a pressing surface, wherein the concave pusher is a pressing surface with respect to the outer diameter of the pusher. The ratio of the length in the pusher axial direction is 0. And less than. In this way, in the pre-press molding process, the powder using the concave pusher whose ratio (L / D) of the pusher axial length (L) of the pressure surface to the pusher outer diameter (D) is less than 0.5. When the body material is pressurized, the powder material can be forced to flow in the mold to remove air mixed in the powder material. Therefore, a seismic isolation plug with a low air content can be manufactured. In addition, after pressing the powder material using a concave pusher having an L / D of less than 0.5 in the pre-press molding step, the side pressed by the concave pusher in the final pressure molding step If a base-isolated plug is manufactured by applying pressure with a flat pusher, it is possible to suppress the occurrence of molding defects at the end face of the base-isolated plug.
In the present invention, the “pressing direction” refers to the direction in which the pusher advances when the powder material in the mold is pressed by the pusher. In addition, the “center portion” refers to a portion located on the innermost side in the pusher radial direction in the pressing direction. Furthermore, the “pusher outer diameter” refers to the maximum outer diameter of the portion of the pusher where the pressing surface is formed. And, “the length of the pressure surface in the direction of the pusher axis” refers to a plane perpendicular to the pressure direction passing through the foremost pressure direction of the pressure surface and a pressure direction through the end of the pressure surface in the pressure direction. It refers to the length along the pressing direction between the orthogonal planes.

  Here, in the manufacturing method of the seismic isolation plug according to the present invention, the concave pusher has, as the pressing surfaces, two planes intersecting at the bottom located in the direction opposite to the pressing direction rather than the foremost pressing direction. It is a wedge groove type pusher, and the two planes preferably intersect at an angle of more than 90 ° as measured from the acute angle side. If a wedge groove type pusher whose crossing angle between two planes is more than 90 ° is used as a concave pusher, the powder material can flow more greatly in the mold to sufficiently remove the air mixed in the powder material. This is because the air content of the seismic isolation plug can be further reduced. In addition, if a wedge groove type pusher whose crossing angle between two planes exceeds 90 ° is used as a concave pusher, it is possible to cause molding defects at the end face of the seismic isolation plug in the final pressure forming process after the pre-pressure forming process. This is because it can be further suppressed.

Further, in the method for manufacturing a seismic isolation plug according to the present invention, the powder material in the mold is press-molded by being sandwiched from both sides by a pusher, and the powder material is formed into the concave shape in the pre-press molding step. It is preferable to pressurize from one side with a pusher and pressurize from the other side with a convex pusher having a pressurizing surface with a central portion protruding in the pressurizing direction with respect to the end in the pressurizing direction. In the pre-press molding process, if the powder material is sandwiched and pressed from both sides by the concave pusher and the convex pusher, the air that has flowed further in the mold and mixed in the powder material This is because the air content of the seismic isolation plug can be further reduced.
In the present invention, the “center portion” refers to a portion located inside the pusher radial direction at the rearmost end in the pressing direction.

  Furthermore, the manufacturing method of the seismic isolation plug of the present invention is such that the ratio of the length of the pressing surface in the pusher axial direction of the convex pusher to the outer diameter of the pusher is the pusher axis of the pressing surface of the concave pusher with respect to the outer diameter of the pusher. It is preferable that it is larger than the ratio of the direction lengths. The ratio (l / d) of the pusher axial length (l) of the pressure surface to the pusher outer diameter (d) of the convex pusher is expressed as the pusher axial direction of the pressure surface to the pusher outer diameter (D) of the concave pusher. If it is larger than the ratio of length (L) (L / D), the powder material can flow sufficiently in the mold and the air mixed in the powder material can be extracted sufficiently. This is because the air content of the plug can be further reduced.

  And the manufacturing method of the seismic isolation plug of this invention is a wedge-shaped pusher which the said convex pusher has as a pressurization surface two planes which cross | intersect in the top side located in a pressurization direction side rather than a pressurization direction rear end. It is preferable. If the wedge-shaped pusher is used as a convex pusher, the powder material can flow more greatly in the mold and the air mixed in the powder material can be sufficiently removed, so the air content of the seismic isolation plug is further reduced. Because it can be done.

  Moreover, this invention aims at solving the said subject advantageously, The seismic isolation plug of this invention was manufactured using the manufacturing method of the seismic isolation plug mentioned above, It is characterized by the above-mentioned. In this way, according to the seismic isolation plug manufactured using the above-described method for manufacturing a seismic isolation plug, the end face of the seismic isolation plug is flat and the air content is low, so that excellent damping performance and displacement followability can be obtained. Can do.

Furthermore, the seismic isolation plug of the present invention is made of a powder material containing a plastic fluid and a hard filler, and has an air content of 3.0% or less and an end face flatness of 1.0% or less. It is characterized by being. As described above, according to the seismic isolation plug made of a powder material in which the air content is 3.0% or less and the flatness of the end face is 1.0% or less, excellent damping performance and displacement followability are obtained. Can be obtained.
In the present invention, the “air content ratio” means the difference (ρ _A −) between the theoretical specific gravity (ρ _A ) of the powder material used for manufacturing the base isolation plug and the actual specific gravity (ρ _B ) of the base isolation plug. ρ _B ) divided by the theoretical specific gravity (ρ _A ) of the powder material used to manufacture the seismic isolation plug and expressed as a percentage (= {(ρ _A −ρ _B ) / ρ _A } × 100%) Point to. Further, the “flatness of the end face” is the difference between the maximum value h _max and the minimum value h _min of the height of the base isolation plug measured at one center and four places on the outer periphery of the end face of the base isolation plug (h _max -h the _min), divided by the average value _{d av} seismic isolation plug diameter measured in two directions perpendicular to each other in each of the end faces of the seismic isolation plug, expressed as a percentage value _{(= {(h} max _{-h min} ) / _Dav } × 100%).

Another object of the present invention is to advantageously solve the above-mentioned problems, and the seismic isolation plug manufacturing apparatus of the present invention provides a powder material containing a plastic fluid material and a hard filler in a mold. A device for producing a seismic isolation plug for a seismic isolation structure by pressure molding with a mold filled with the powder material and a plurality of used for pressurizing the powder material in the mold And a pusher exchanging mechanism for exchanging a pusher used for pressurizing the powder material, and the plurality of pushers have a central portion opposite to the pressurizing direction with respect to the leading end in the pressurizing direction. A concave pusher having a pressure surface depressed in the surface and a planar pusher having a pressure surface as a plane perpendicular to the pressure direction, the concave pusher having a ratio of the length of the pressure surface in the pusher axial direction to the outer diameter of the pusher. Less than 0.5 The features. In this way, if a concave pusher having a ratio (L / D) of the length (L) of the pressing surface in the pusher axial direction to the pusher outer diameter (D) is less than 0.5, the concave pusher is used. By pressurizing the powder material, the powder material can be forced to flow in the mold to remove air mixed in the powder material. Therefore, a seismic isolation plug with a low air content can be manufactured. In addition, if a flat pusher and a pusher exchange mechanism are provided, the powder material pressed by the concave pusher can be pressed by the flat pusher to suppress the occurrence of molding defects on the end face of the seismic isolation plug.
In the present invention, the “pressing direction” refers to the direction in which the pusher is advanced when the powder material in the mold is pressed with the pusher. In addition, the “center portion” refers to a portion located on the innermost side in the pusher radial direction in the pressing direction. Furthermore, the “pusher outer diameter” refers to the maximum outer diameter of the portion of the pusher where the pressing surface is formed. And, “the length of the pressure surface in the direction of the pusher axis” refers to a plane perpendicular to the pressure direction passing through the foremost pressure direction of the pressure surface and a pressure direction through the end of the pressure surface in the pressure direction. It refers to the length along the pressing direction between the orthogonal planes.

  Here, in the seismic isolation plug manufacturing apparatus of the present invention, the concave pusher has, as the pressing surfaces, two planes that intersect at the bottom located in the direction opposite to the pressing direction rather than the foremost pressing direction. It is a wedge groove type pusher, and the two planes preferably intersect at an angle of more than 90 ° as measured from the acute angle side. If a wedge groove type pusher with an angle of intersection of two planes exceeding 90 ° is provided as a concave pusher, the powder material is further increased in the mold by pressurizing the powder material using the wedge groove type pusher. This is because the air content of the seismic isolation plug can be further reduced because the air mixed in the powder material can be sufficiently removed. In addition, if a wedge groove type pusher with an intersection angle between two planes exceeding 90 ° is provided, the powder material pressurized by the wedge groove type pusher is pressed by the plane pusher, and a molding defect occurs at the end face of the seismic isolation plug. It is because it can suppress further.

  Moreover, it is preferable that the seismic isolation plug manufacturing apparatus of the present invention further includes a convex pusher having a pressing surface whose central portion protrudes in the pressing direction with respect to the rearmost end in the pressing direction, as the plurality of pushers. If a convex pusher is provided, the powder material is pressurized from both sides with the concave pusher and the convex pusher, allowing the powder material to flow more greatly in the mold to sufficiently absorb the air mixed in the powder material. This is because the air content of the seismic isolation plug can be further reduced.

  Further, in the seismic isolation plug manufacturing apparatus of the present invention, the ratio of the length of the pressing surface in the pusher axial direction of the convex pusher to the outer diameter of the pusher is the pusher axis of the pressing surface of the concave pusher with respect to the outer diameter of the pusher. It is preferable that it is larger than the ratio of the direction lengths. The ratio (l / d) of the pusher axial length (l) of the pressure surface to the pusher outer diameter (d) of the convex pusher is expressed as the pusher axial direction of the pressure surface to the pusher outer diameter (D) of the concave pusher. If the length (L) is greater than the ratio (L / D), when the powder material is pressed from both sides with the concave pusher and the convex pusher, the powder material will flow sufficiently in the mold. This is because the air mixed in the powder material can be sufficiently removed, so that the air content of the seismic isolation plug can be further reduced.

  In the seismic isolation plug manufacturing apparatus of the present invention, the convex pusher is a wedge-shaped pusher having, as pressure surfaces, two planes intersecting at the apex located on the pressure direction side with respect to the pressure direction rearmost end. It is preferable. If the wedge-shaped pusher is used as a convex pusher, the powder material is pressurized using the wedge-shaped pusher to cause the powder material to flow more greatly in the mold and sufficiently remove air mixed in the powder material. This is because the air content of the seismic isolation plug can be further reduced.

  According to the manufacturing method and the manufacturing apparatus of the seismic isolation plug of the present invention, it is possible to manufacture the seismic isolation plug having a low air content while suppressing the occurrence of molding defects. Further, according to the present invention, it is possible to provide a seismic isolation plug having a flat end face and a low air content and excellent damping performance and displacement followability.

(A)-(k) is a figure explaining the process of manufacturing a seismic isolation plug using the manufacturing method of the typical seismic isolation plug according to this invention. (A) is a top view of the seismic isolation structure in which the seismic isolation plug of the present invention is press-fitted, and (b) is a sectional view taken along line II of the seismic isolation structure shown in FIG. 2 (a). is there. It is a figure which shows the shape of the front-end | tip part of the wedge-shaped pusher used for manufacture of a seismic isolation plug, (a) is a front view, (b) is a side view, (c) is a top view. It is a figure which shows the shape of the front-end | tip part of the wedge groove type pusher used for manufacture of a seismic isolation plug, (a) is a front view, (b) is a side view, (c) is a top view. (A)-(e) is a figure explaining the process of manufacturing a seismic isolation plug using the manufacturing method of the other seismic isolation plug according to this invention. It is a figure explaining the calculation method of the volume of a seismic isolation plug, and the flatness degree of an end surface. (A)-(b) is a front view which shows the shape of the front-end | tip part of the modification of a concave pusher, (c)-(d) is the front which shows the shape of the front-end | tip part of the modification of a convex pusher. FIG. It is a graph which shows the relationship between a horizontal deformation displacement (delta) and a horizontal load (Q) in the base isolation structure using a base isolation plug.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, the manufacturing method of the seismic isolation plug according to the present invention provides a predetermined shape when the powder material containing the plastic fluid material and the hard filler is pressure-molded in a mold to manufacture the seismic isolation plug. The powder material is pressurized using the pushers having the predetermined order. Specifically, in the method for manufacturing a seismic isolation plug according to the present invention, at least one side of the powder material filled in the mold has a direction in which the central portion is opposite to the pressurizing direction with respect to the forefront of the pressurizing direction. After applying pressure using a concave pusher having a pressing surface recessed into the surface, add a plane perpendicular to the pressing direction to at least the side of the pressurized powder material that has been pressed using the concave pusher. Pressurization is performed using a flat pusher having a pressure surface. In addition, the manufacturing method of the seismic isolation plug of this invention requires using the concave pusher whose ratio of the length of a pressurization surface direction of a pressurization surface with respect to a pusher outer diameter is less than 0.5. Moreover, in the manufacturing method of the seismic isolation plug of this invention, when pressing powder material using a concave pusher, it has the pressurization surface which the center part protruded in the pressurization direction with respect to the pressurization direction end. The powder material may be sandwiched between a convex pusher and a concave pusher and pressurized.
And the seismic isolation plug of this invention manufactured using the manufacturing method of the seismic isolation plug of this invention is used for the seismic isolation structure used as a support etc. of a seismic isolation apparatus.

  Specifically, the seismic isolation plug of the present invention has, for example, a top view in FIG. 2 (a) and a cross-sectional view taken along line II in FIG. 2 (a). A laminated body 54 having a cylindrical hollow portion 53 extending in the laminating direction (vertical direction) by alternately laminating soft plates 51 having substantially donut disk-like elasticity and hard plates 52 having rigidity; Two flanges made of a substantially donut disk-shaped flange plate 56 and a disk-shaped sealing plate 55 fixed to both ends (upper end and lower end) of 54, and a rubber covering material 57 covering the outer peripheral surface of the laminate 54 Are used by being press-fitted into the hollow portion 53 of the seismic isolation structure 50. And the seismic isolation structure 50 formed by press-fitting the seismic isolation plug 20 in the hollow part 53 of the laminated body 54 is used, for example, attached between the ground and the structure.

  Here, an example of the seismic isolation plug of the present invention includes a mold filled with a powder material containing a plastic fluid material and a hard filler, and a plurality of pushers used for pressurizing the powder material in the mold. Using the example of the seismic isolation plug manufacturing apparatus of the present invention that includes the pusher replacement mechanism that replaces the pusher used to pressurize the powder material, for example, it can be manufactured as described below.

  The pusher replacement mechanism of the seismic isolation plug manufacturing apparatus may be a mechanism that allows replacement of the pusher to be used by moving the mold along a plurality of pushers arranged in parallel in the order of use. The mechanism may be such that the pushers to be used can be replaced by moving a plurality of pushers arranged in parallel in the order of use with respect to the mold having a fixed position. Furthermore, the pusher exchange mechanism may have a rotation mechanism that rotates at least one of the pusher and the mold with respect to a rotation axis extending in a direction parallel to the direction in which the powder material is pressed.

  Further, the plastic fluid material constituting the powder material used for manufacturing the seismic isolation plug is not particularly limited, and examples thereof include natural rubber, polybutadiene rubber, acrylic rubber, silicon rubber, polyurethane, and urethane-based elastomer. Estramer components, resins such as rosin resin and phenol resin, reinforcing fillers such as carbon black and silica, plasticizers such as phthalic acid, maleic acid and citric acid, and castor oil, linseed oil, rapeseed oil, etc. The mixture containing a softener is mentioned. Further, the hard filler is not particularly limited, for example, metal such as copper powder, stainless steel powder, zirconium powder, tungsten powder, bronze powder, aluminum powder, nickel powder, molybdenum powder, titanium powder, iron powder, etc. Examples thereof include powders and metal compounds. The composition of the plastic fluid material and the hard filler can be appropriately changed according to the performance required for the seismic isolation plug 20.

  In an example of the manufacturing method of the seismic isolation plug of this invention, according to the process shown to Fig.1 (a)-(k), the wedge-shaped pusher 3 as a convex pusher, the wedge groove-shaped pusher 4 as a concave pusher, and a plane Using the pushers 5 in a predetermined order and combination, the powder material in the mold is pressure-molded to manufacture a seismic isolation plug. In addition, the pressure at the time of pressure-molding powder material can be suitably set according to the performance etc. of a desired seismic isolation plug.

Here, the wedge-shaped pusher 3 is shown in FIG. 3A, a side view in FIG. 3B, and a plan view in FIG. In this way, the two flat surfaces 32a and 32b intersecting at the apex 31 that protrudes to the pressing direction side (the upper side in FIGS. 3A and 3B) from the pressing direction rearmost ends 33a and 33b are pressed surfaces. As a pusher. That is, in the wedge-shaped pusher 3, the central portion of the pressure surface (the portion located on the inner side in the pusher radial direction of the pressure direction rear ends 33a and 33b) is in the pressure direction with respect to the pressure direction rear ends 33a and 33b. It protrudes.
And in the front-end | tip part of the wedge-shaped pusher 3, the cross section orthogonal to the top side 31 is convex V shape in the pressurization direction, and the direction orthogonal to both the extension direction of the top side 31 and the pressurization direction ( The width of the wedge-shaped pusher 3 in the left-right direction in FIG. 3A gradually decreases toward the top side 31.
In the wedge-shaped pusher 3, the two planes 32a and 32b intersect at an intersection angle β. Further, the pusher outer diameter of the wedge-shaped pusher 3 is d, and the length of the pressing surface in the pusher axis direction is l.

  Incidentally, in the wedge-shaped pusher 3 shown in FIG. 3, the apex 31 is positioned at the center of the wedge-shaped pusher 3 in plan view from the viewpoint of facilitating the straight insertion of the wedge-shaped pusher 3 into the mold. In the manufacturing method of the seismic isolation plug, a wedge-shaped pusher in which the position of the apex 31 in plan view is offset from the center may be used. In the wedge-shaped pusher 3 shown in FIG. 3, the apex 31 is orthogonal to the pressurizing direction. However, in the seismic isolation plug manufacturing method of the present invention, a wedge-shaped pusher whose apex is inclined with respect to the pressurizing direction is used. It may be used.

The wedge-groove pusher 4 is shown in FIG. 4A, a side view in FIG. 4B, and a plan view in FIG. In addition, the bottom 41 (in other words, the wedge groove type pusher 4 of the wedge groove type pusher 4) is depressed in the direction opposite to the pressurizing direction (upward in FIGS. 4A and 4B) than the pressurizing direction leading ends 43a and 43b. The pusher has two flat surfaces 42a and 42b that intersect at the pressure direction leading edge 43a and 43b at the rear side of the pressure direction (the bottom 41 in FIGS. 4A and 4B) as pressure surfaces. . That is, a groove having a V-shaped cross section perpendicular to the bottom 41 is formed at the tip of the wedge groove pusher 4.
At the tip of the wedge groove-shaped pusher 4, the cross section perpendicular to the base 41 has a V shape that is convex in the direction opposite to the pressurizing direction, and both the extending direction of the base 41 and the pressurizing direction are both. The distance between the planes 42 a and 42 b in the direction orthogonal to the horizontal direction (the left-right direction in FIG. 4A) gradually decreases toward the bottom 41.
In the wedge groove type pusher 4, the two flat surfaces 42a and 42b intersect at an intersecting angle α. The pusher outer diameter of the wedge groove type pusher 4 is D, and the length of the pressure surface in the pusher axis direction is L. In this wedge groove type pusher 4, the ratio L / D of the length L in the pusher axial direction of the pressure surface to the pusher outer diameter D is less than 0.5. Further, the crossing angle α is more than 90 °.

  Incidentally, in the wedge groove type pusher 4 shown in FIG. 4, the base 41 is positioned at the center of the wedge groove type pusher 4 in plan view from the viewpoint of facilitating the straight insertion of the wedge groove type pusher 4 into the mold. However, in the seismic isolation plug manufacturing method of the present invention, a wedge groove type pusher in which the position of the bottom 41 in a plan view is offset from the center may be used. Further, in the wedge groove type pusher 4 shown in FIG. 4, the bottom 41 is orthogonal to the pressurizing direction. However, in the method for manufacturing the seismic isolation plug of the present invention, the bottom is inclined with respect to the pressurizing direction. A pusher may be used.

The plane pusher 5 is a pusher having a plane orthogonal to the pressing direction as a pressing surface. The planar shape of the planar pusher 5 is substantially the same as the sectional shape orthogonal to the pressing direction of the hollow portion of the mold filled with the powder material.
Incidentally, the pusher outer diameter d of the wedge-shaped pusher 3, the pusher outer diameter D of the wedge groove-shaped pusher 4, the pusher outer diameter of the flat pusher 5 and the inner diameter of the mold 1 are substantially equal.

And in an example of the manufacturing method of the seismic isolation plug of this invention which shows a manufacturing process to Fig.1 (a)-(k), as shown to Fig.1 (a)-(h), a cylindrical metal mold | die is shown first. The powder material 2 put into the interior of 1 is pressed by being sandwiched from both sides by a pair of wedge-shaped pushers 3 and wedge groove-shaped pushers 4 opposed to each other in the pressing direction.
Specifically, first, as shown in FIG. 1A, a wedge-shaped pusher 3 is inserted into the mold 1 from one side (upper side in FIG. 1) of the powder material 2 filled in the mold 1. At the same time, a wedge-shaped pusher 4 is inserted into the mold 1 from the other side (lower side in FIG. 1) of the powder material 2, and the wedge-shaped pusher 3 and the wedge groove facing the powder material 2 in the pressing direction. Pressure is applied by sandwiching the pusher 4 from both sides. Next, as shown in FIG. 1 (b), after the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 are extracted from the mold 1, as shown in FIG. 1 (c), the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 are removed. Is rotated by 90 °, for example, and the powder material 2 is sandwiched from both sides by the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 rotated by 90 °, and pressurized again. Thereafter, as shown in FIG. 1 (d), the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 are extracted from the mold 1. Then, as shown in FIGS. 1E to 1H, the wedge-shaped pusher 3 and the wedge-groove pusher 4 are rotated by 90 °, for example, and the wedge-shaped pusher 3 and the wedge-groove pusher 4 rotated by 90 ° are used for the powder material. The operation of pressurizing again by sandwiching 2 from both sides is repeated twice more. That is, the powder material 2 is pressed a total of four times while the extending direction of the top side 31 of the wedge-shaped pusher 3 and the extending direction of the bottom side 41 of the wedge-shaped pusher 4 are different from those of the previous pressing. (Pre-press molding process).

  In this pre-press forming step, the powder material 2 is pressurized with a wedge-shaped pusher 3 from one side and is pressed with a wedge-groove pusher 4 from the other side. Therefore, the shape of the end surface (pressure receiving surface) of the pressed powder material 2 is a shape corresponding to the shape of the pressure surface of the wedge-shaped pusher 3 on one side, and corresponds to the shape of the pressure surface of the wedge-shaped pusher 4 on the other side. It becomes the shape. That is, the powder material 2 that has been pressed in the pre-press molding step is composed of two planes whose one end face intersects at an angle β and whose other end face intersects two angles at an angle α. Become.

  Finally, in the manufacturing method of the seismic isolation plug of this example, as shown in FIGS. 1 (i) to (k), the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 were pressurized in the pre-press molding process. The powder material 2 is pressed by being sandwiched from both sides by a pair of flat pushers 5 and 5 facing each other in the pressing direction. Specifically, first, as shown in FIG. 1 (i), the flat pushers 5 and 5 are inserted into the mold 1 from both sides of the powder material 2 to pressurize the powder material 2. Next, as shown in FIG. 1 (j), the two flat pushers 5 and 5 are extracted from the mold 1 (final pressure molding step). Then, the seismic isolation plug 20 made of the pressure-formed powder material 2 is removed from the mold 1.

  Then, according to the manufacturing method of the seismic isolation plug of this example, since the other side of the powder material 2 is pressed by the wedge groove type pusher 4 in the pre-pressing molding step, the powder material is formed in the mold 1. 2 can be forced to flow to remove air mixed in the powder material 2. Therefore, the seismic isolation plug 20 having a low air content can be manufactured. Although the reason why the powder material 2 can be forced to flow by using the wedge groove type pusher 4 is not clear, the length of the pressure surface in the pusher axial direction with respect to the pusher outer diameter D of the wedge groove type pusher 4 is not clear. Since the ratio L / D of the thickness L is less than 0.5, the powder material 2 is pushed along the pressure surface of the wedge groove-shaped pusher 4 along the pressure surface with a gentle slope (the bottom 41 side). It is guessed that it is possible to flow sufficiently. That is, the wedge groove type pusher 4 has a ratio L / D of less than 0.5, and the crossing angle α between the two flat surfaces 42a and 42b serving as the pressing surfaces is an obtuse angle (greater than 90 °). 4 is presumed to allow the powder material 2 to sufficiently flow to the bottom 41 side of the wedge-shaped pusher 4 along the planes 42a and 42b having gentle slopes. In addition, when the powder material is made to flow strongly in the mold, the air in the powder material is released and the air content of the seismic isolation plug is lowered. This is presumably because the fillers are densely arranged.

  In this example of the method for manufacturing a seismic isolation plug, the other side of the powder material 2 is pressed in the final pressure forming step after the other side of the powder material 2 is pressed by the wedge groove type pusher 4 in the pre-press forming step. The seismic isolation plug 20 is manufactured by pressing the side (the side pressed by the wedge groove type pusher 4) with the flat pusher 5. Therefore, in this example of the method for manufacturing a seismic isolation plug, it is possible to suppress the occurrence of molding defects on the end face of the seismic isolation plug 20 (particularly, the end face on the other side (lower side in FIG. 1)). The reason why it is possible to suppress the occurrence of molding defects on the end face of the seismic isolation plug by sequentially performing the pre-press molding process and the final pressure molding process is not clear, but is as follows. Inferred. In other words, the ratio L / D of the pusher axial direction length L of the pressure surface to the pusher outer diameter D of the wedge groove type pusher 4 is less than 0.5, and the wedge groove type pusher 4 is pressurized in the pre-press molding process. Since the inclination of the pressure-receiving surface of the powder material 2 is gentle, when the powder material 2 is pressed by the flat pusher 5 in the final pressure forming process, the powder material 2 is the inner peripheral surface of the mold 1. It is presumed that it can flow well to the side (that is, the outer peripheral edge side of the end face of the seismic isolation plug 20) and suppress the occurrence of molding defects. In other words, the wedge groove type pusher 4 has a ratio L / D of less than 0.5, and the crossing angle α between the two flat surfaces 42a and 42b serving as the pressing surfaces is an obtuse angle. Compared to the case of using a wedge groove type pusher having 5 or more (crossing angle α is 90 ° or less), the flat pusher 5 is used for the pressure receiving surface of the powder material 2 having a gentle inclination (the crossing angle α of the flat surface is obtuse). It is assumed that the powder material 2 can be flowed well to the inner peripheral surface side of the mold 1 by applying pressure.

  Here, in the manufacturing method of the seismic isolation plug of this example, after pressing one side of the powder material 2 with the wedge-shaped pusher 3 in the pre-press forming step, one side of the powder material 2 in the final press forming step. The side pressed by the wedge-shaped pusher 3 is pressed by the flat pusher 5. Therefore, in the final pressure molding process, on one side of the powder material 2, the powder material 2 flows toward the center side of the pressure receiving surface (a position corresponding to the top side 31 of the wedge-shaped pusher 3). Therefore, in this example of the method for manufacturing a seismic isolation plug, even on the one end face of the seismic isolation plug 20, the occurrence of collapse (chip) of the outer peripheral portion of the end face can be suppressed, and the occurrence of molding defects can be suppressed. .

  In this example of the seismic isolation plug manufacturing method, since the powder material 2 is sandwiched and pressed by the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 in the pre-press forming step, The material 2 can be forced to flow, and the air in the powder material 2 can be sufficiently extracted. Furthermore, in the manufacturing method of the seismic isolation plug of this example, in the pre-press forming process, the extending direction of the top side 31 of the wedge-shaped pusher 3 and the extending direction of the bottom side 41 of the wedge-shaped pusher 4 are made different. Since the material 2 is pressurized a plurality of times (four times in FIG. 1), the flow of the powder material 2 in the mold 1 is strongly promoted, and the air in the powder material 2 can be sufficiently extracted.

  Incidentally, in the pre-press molding process, from the viewpoint of sufficiently flowing the powder material 2 to the rear end side (bottom 41 side) in the pressing direction of the pressing surface of the wedge groove-shaped pusher 4, the wedge-shaped pusher 3 is applied during pressing. It is preferable that the extending direction of the top side 31 and the extending direction of the bottom side 41 of the wedge-shaped pusher 4 coincide with each other. However, in the seismic isolation plug manufacturing method of the present invention, the powder material 2 may be pressed in a state where the extending direction of the top side 31 and the extending direction of the bottom side 41 are different. Moreover, you may change suitably the frequency | count of pressurizing the powder material 2 according to the diameter of the seismic isolation plug to manufacture, or the composition of powder material. Furthermore, the angle at which the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 are rotated is an arbitrary angle as long as the extending direction of the top side 31 and the bottom side 41 can be changed (that is, other than an integral multiple of 180 °). However, from the viewpoint of allowing the powder material 2 to flow evenly in the mold 1, the angle is preferably 90 °. In the seismic isolation plug manufacturing method of the present invention, the top and bottom sides are extended by rotating a mold filled with a powder material inside while the positions of the wedge-shaped pusher and the wedge-groove pusher are fixed. You may change the direction.

As described above, according to the manufacturing method of the seismic isolation plug of this example, the powder material 2 is forced to flow in the mold 1 by sequentially performing the pre-press molding step and the final press molding step. Since the air mixed in the powder material 2 can be removed, the seismic isolation plug 20 having a low air content can be manufactured. In addition, the occurrence of molding defects on the end face of the seismic isolation plug 20 can be suppressed. Therefore, it is possible to manufacture a seismic isolation plug having a low air content while suppressing the occurrence of molding defects.
And the seismic isolation plug manufactured using the manufacturing method of the seismic isolation plug of the above example has an air content of, for example, 3.0% or less, preferably 2.8% or less, and the flatness of the end surface is, for example, 1.0% or less, preferably 0.8% or less. This seismic isolation plug exhibits very good damping performance and displacement followability when used in a seismic isolation structure.

  Here, from the viewpoint of allowing the powder material to flow well in the mold in the pre-press molding process and reducing the air content of the seismic isolation plug, the concave pusher (wedge groove type pusher 4 in the above example) is used. The ratio L / D of the length L in the pusher axial direction of the pressure surface with respect to the pusher outer diameter D is preferably 0.134 or more, more preferably 0.182 or more, and preferably 0.289 or less. Particularly preferred. This is because if the ratio L / D is too small, the shape of the tip of the concave pusher approaches the flat pusher and the powder material may not be able to flow sufficiently in the mold. Further, if the ratio L / D is 0.289 or less, it is possible to achieve both higher levels of suppression of molding defects and reduction in air content.

  Further, from the viewpoint of allowing the powder material to flow well in the mold in the pre-press molding process and reducing the air content of the seismic isolation plug, the intersection angle α of the plane of the wedge groove type pusher as the concave pusher Is preferably 150 ° or less, more preferably 140 ° or less, and particularly preferably 120 ° or more. This is because if the crossing angle α is too large, the shape of the tip of the wedge groove type pusher approaches the flat pusher and the powder material may not be able to flow sufficiently in the mold. In addition, if the crossing angle α is set to 120 ° or more, it is possible to achieve higher levels of suppressing the occurrence of molding defects and reducing the air content.

  Furthermore, from the viewpoint of allowing the powder material to flow well in the mold in the pre-press molding step and reducing the air content of the seismic isolation plug, the outer diameter of the pusher of the convex pusher (wedge shaped pusher 3 in the above example). It is preferable that the ratio 1 / d of the length l in the pusher axial direction of the pressing surface with respect to d is larger than the ratio L / D of the concave pusher (wedge groove type pusher 4 in the above example). When the ratio l / d is larger than the ratio L / D, the powder material can sufficiently flow to the rear end side in the pressing direction of the pressing surface of the concave pusher, and air can be sufficiently extracted from the powder material. It is.

  Further, from the viewpoint of achieving a higher level of suppressing the occurrence of molding defects and reducing the air content rate, the direction of the pusher axis of the pressing surface with respect to the pusher outer diameter d of the convex pusher (wedge shaped pusher 3 in the above example) The ratio l / d of the length l is preferably 0.50 or less, more preferably 0.134 or more, particularly preferably less than 0.50, and preferably 0.233 or more. More preferred. When the ratio l / d is too large, the powder material does not flow to the center when the side pressed with the convex pusher is pressed with the flat pusher, and the depression is formed in the center of the end face of the seismic isolation plug (molding failure). ) May occur. Further, when the ratio 1 / d is too small, the shape of the tip of the convex pusher approaches the flat pusher, and there is a possibility that the powder material cannot be sufficiently flowed in the mold.

  Furthermore, from the viewpoint of achieving a high level of suppressing the occurrence of molding defects and reducing the air content, the crossing angle β of the wedge-shaped pusher as the convex pusher is preferably 90 ° or more, It is further preferably 150 ° or less, particularly preferably more than 90 °, and more preferably 130 ° or less. If the crossing angle β is too small, the powder material does not flow to the center when the side pressed with the wedge-shaped pusher is pressed with a flat pusher, and a recess (molding failure) is formed in the center of the end face of the seismic isolation plug. This is because it may occur. Further, if the crossing angle β is too large, the shape of the tip of the wedge-shaped pusher approaches the flat pusher, and there is a possibility that the powder material cannot be sufficiently flowed in the mold.

  As mentioned above, although embodiment of this invention was described with reference to drawings, the manufacturing method of the seismic isolation plug of this invention, the manufacturing apparatus of a seismic isolation plug, and a seismic isolation plug are not limited to the example mentioned above, The seismic isolation plug manufacturing method, the seismic isolation plug manufacturing apparatus, and the seismic isolation plug of the invention can be modified as appropriate.

  Specifically, in the seismic isolation plug manufacturing method of the present invention, it is not necessary to press the powder material from both sides with a pusher. For example, as shown in FIGS. 5 (a) to 5 (e), one end is closed. Alternatively, the powder material 2 filled in the bottomed cylindrical mold 61 may be pressurized from one side to manufacture a seismic isolation plug. Here, in the manufacturing method of the seismic isolation plug of this other example, specifically, as shown in FIG. 5A, first, one side of the powder material 2 filled in the mold 61 (FIG. 5). Then, the wedge groove type pusher 4 as a concave pusher is inserted into the mold 61 from the upper side), and the powder material 2 is pressurized (pre-press molding step). Next, as shown in FIG. 5 (b), after the wedge-groove pusher 4 is removed from the mold 61, as shown in FIG. 5 (c), one side of the powder material 2 (upper side in FIG. 6). Then, the flat pusher 5 is inserted into the mold 61, and the powder material 2 is pressed again (final pressure molding step). And finally, as shown in FIG.5 (d), the seismic isolation plug 20 as shown in FIG.5 (e) can be obtained by extracting the plane pusher 5 from the metal mold | die 61. FIG.

  Moreover, in the manufacturing method and manufacturing apparatus of the seismic isolation plug of this invention, you may use the pusher shown to Fig.7 (a), (b) as a concave shape pusher. Moreover, in the manufacturing method and manufacturing apparatus of the seismic isolation plug of this invention, you may use the pusher shown to FIG.7 (c), (d) as a convex pusher.

  Here, the pusher 4A whose front view is shown in FIG. 7 (a) is a mortar-shaped pusher having a pressure surface 42A made of a conical depression. In the mortar-shaped pusher 4A, the bottom 41A of the dent is positioned in a direction opposite to the pressurizing direction with respect to the foremost edge 43A in the pressurizing direction. That is, the mortar-shaped pusher 4A has a pressing surface 42A in which the central portion is depressed in the direction opposite to the pressing direction with respect to the forefront of the pressing direction. Further, in this mortar-shaped pusher 4A, the ratio L / D of the length L in the pusher axial direction of the pressure surface 42A to the pusher outer diameter D is less than 0.5.

  A pusher 4B, whose front view is shown in FIG. 7B, is a pusher having a pressurizing surface 42B made up of a substantially cylindrical depression whose diameter is reduced stepwise. In the pusher 4B, the bottom surface 41B of the recess is positioned in a direction opposite to the pressurizing direction with respect to the foremost edge 43B in the pressurizing direction. That is, the pusher 4B has a pressurizing surface 42B in which the central portion is recessed in the direction opposite to the pressurizing direction with respect to the forefront of the pressurizing direction. In the pusher 4B, the ratio L / D of the length L in the pusher axial direction of the pressing surface 42B to the pusher outer diameter D is less than 0.5.

  A pusher 3A whose front view is shown in FIG. 7C is a conical pusher having a pressing surface 32A made of a conical protrusion. In the conical pusher 3A, the apex 31A of the projecting portion is positioned on the pressing direction side of the pressing surface 32A with respect to the pressing direction foremost rear end edge 33A. That is, the conical pusher 3 </ b> A has a pressing surface 32 </ b> A whose central portion protrudes in the pressing direction with respect to the end in the pressing direction.

  A pusher 3B whose front view is shown in FIG. 7D is a pusher having a pressurizing surface 32B made up of a substantially columnar projecting portion whose diameter is reduced stepwise. And as for this pusher 3B, the top surface 31B of the protrusion part is located in the pressurization direction side rather than the pressurization direction end edge 33B of the pressurization surface 32B. That is, the pusher 3B has a pressing surface 32B having a central portion protruding in the pressing direction with respect to the end in the pressing direction.

  Moreover, in the manufacturing method of the seismic isolation plug of this invention, you may pinch and press a powder material from both sides with two concave pushers in a pre-press-molding process. Furthermore, in the seismic isolation plug manufacturing method of the present invention, only one side of the powder material is pressed with a concave pusher in the pre-pressing step, and the other side of the powder material is added using a pusher of any shape. You may press. When the other side of the powder material is pressed with a pusher having an arbitrary shape in the pre-press molding process, the other side of the powder material is pressed with a pusher other than the flat pusher in the final pressure molding process. The other end face may be flattened by using means such as cutting after pressurization.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to the following Example at all.

Example 1
A seismic isolation plug was manufactured in a cylindrical mold having an inner diameter of 16 cm using a powder material containing a plastic fluid and a hard filler having the composition shown in Table 1.
Specifically, as shown in Table 2, as a pre-press molding process, the powder material was sandwiched and pressed from both sides by a wedge-shaped pusher and a wedge groove-shaped pusher having the shape shown in Table 2. Thereafter, as a final pressure forming step, the powder material was sandwiched from both sides by two flat pushers and pressed once in total. In the pre-press forming step, the powder material was pressed a total of four times while rotating the wedge-shaped pusher and the wedge groove-shaped pusher by 90 °.
And about the obtained seismic isolation plug, the air content rate, the flatness degree of an end surface, an external appearance, and attenuation | damping performance were evaluated with the following method. The results are shown in Table 2.

* 1 Amorphous powder, average particle size 40μm
* 2 Blend of natural rubber and synthetic rubber

<Air content>
The theoretical specific gravity (ρ _A ) of the powder material used for manufacturing the base isolation plug and the actual specific gravity (ρ _B ) of the base isolation plug were determined. Then, the difference (ρ _A −ρ _B ) between the theoretical specific gravity (ρ _A ) of the powder material used for manufacturing the base isolation plug and the actual specific gravity (ρ _B ) of the base isolation plug was used for manufacturing the base isolation plug. The value obtained by dividing the powder material by the theoretical specific gravity (ρ _A ) was expressed as a percentage to obtain an air content ε (= {(ρ _A −ρ _B ) / ρ _A } × 100%). The actual specific gravity of the seismic isolation plug was calculated using the following formula (1). Moreover, it was 5.204 g / cm < ³ > when the theoretical specific gravity ((rho) _A ) of the powder material used for manufacture of a seismic isolation plug was computed.
ρ _B = W _B / V _B = W _B / (A _B × h _av ) (1)
Here, in the formula (1), W _B is the mass of the seismic isolation plugs, V _B is the volume of seismic isolation plug, A _B is the cross-sectional area of the seismic isolation plug, the h _av is the average height of the seismic isolation plug. Incidentally, _{A B} may be calculated using the average value _{d av} seismic isolation plug diameter _{(A B = (d av /} 2) 2 × π), the average diameter _{d av} seismic isolation plug 6 As shown in FIG. ₂ , the average values of the diameters of the seismic isolation plugs (d ₁ , d ₂ , d ₃ , d ₄ ) measured with calipers in two directions orthogonal to each other on both end surfaces (upper surface and lower surface) of the seismic isolation plug 20 ( d _av = (d ₁ + d ₂ + d ₃ + d ₄ ) / 4). In addition, h _av is the average value (h _av ) of the heights (h ₁ , h ₂ , h ₃ , h ₄ ) of the seismic isolation plugs measured with calipers at four locations on the outer periphery of the end face of the seismic isolation plug 20 shown in FIG. = (H ₁ + h ₂ + h ₃ + h ₄ ) / 4).
<Flatness of the end face>
As for the manufactured seismic isolation plug, as shown in FIG. 6, the heights of the seismic isolation plugs (h ₁ , h ₂ , h ₃ , h _{4) at} a total of 5 locations including the outer periphery of the seismic isolation plug 20 at four locations and the central one location. , H ₅ ) were measured with calipers. Further, as shown in FIG. 6, the seismic isolation plug diameters (d ₁ , d ₂ , d ₃ , d ₄ ) are set in two directions orthogonal to each other on both end surfaces (upper surface and lower surface) of the seismic isolation plug 20 with calipers. It was measured. Then, the difference (h _max −h _min ) between the maximum height h _max and the minimum value h _min of the measured five base isolation plugs is determined as the average value d _av (= (d _The value obtained by dividing by ₁ + d ₂ + d ₃ + d ₄ ) / 4) was expressed as a percentage to obtain a flatness degree f (= {(h _max −h _min ) / d _av } × 100%).
<Appearance of seismic isolation plug>
Visually observe the appearance of the manufactured seismic isolation plug, “○ (very good)” when there is no conspicuous defect (molding defect), “△ (good)” when there is a defect but not significant, The case where the defect was remarkable and the moldability was very bad was evaluated as “x (defect)”.
<Attenuation performance>
The seismic isolation structure into which the manufactured seismic isolation plug was press-fitted in a horizontal direction with a reference surface pressure applied in the vertical direction using a dynamic testing machine to cause shear deformation with a specified displacement. The vibration displacement was set such that the total rubber (soft plate) thickness of the laminate was 100%, the strain was 50 to 250%, the vibration frequency was 0.33 Hz, and the vertical surface pressure was 15 MPa. FIG. 8 shows an example of the relationship between the horizontal deformation displacement (δ) and the horizontal load (Q) of the seismic isolation structure. As the area ΔW of the region surrounded by the hysteresis curve in FIG. 8 becomes wider, it means that more vibration energy can be absorbed. Here, simple for the attenuation of seismic isolation plug (horizontal load value in displacement 0) intercept load _{Q d} in the distortion 100% seismic isolation plug cross-sectional area _{A B} at a value obtained by dividing .tau.p ₍₌ Q d / _{A B)} Performance was evaluated. Incidentally, sections load _{Q d,} using the load _{Q d1, Q d2} at the point where the hysteresis curve intersects the vertical axis was calculated from the following equation (2).
Q _d = (Q _d1 + Q _d2 ) / 2 (2)
As τp increases, the area surrounded by the hysteresis curve increases, indicating that the attenuation performance is excellent.

(Examples 2-3)
A seismic isolation plug was manufactured in the same manner as in Example 1 except that the shapes of the wedge-shaped pusher and the wedge groove-shaped pusher used in the pre-press molding process were changed as shown in Table 2.
And about the obtained seismic isolation plug, the air content rate, the flatness degree of an end surface, the external appearance, and the attenuation | damping performance were evaluated by the method similar to Example 1. FIG. The results are shown in Table 2.

Example 4
A seismic isolation plug was produced in the same manner as in Example 1 except that the operation of the pre-press molding process was changed as shown in Table 2.
Specifically, as shown in Table 2, as a pre-press molding process, the powder material was sandwiched and pressed from both sides by two wedge groove type pushers. Thereafter, as a final pressure forming step, the powder material was sandwiched from both sides by two flat pushers and pressed once in total. In the pre-press forming step, the powder material was pressed a total of four times while rotating the wedge groove type pusher by 90 °.
And about the obtained seismic isolation plug, the air content rate, the flatness degree of an end surface, the external appearance, and the attenuation | damping performance were evaluated by the method similar to Example 1. FIG. The results are shown in Table 2.

(Conventional example 1)
A seismic isolation plug was manufactured in a cylindrical mold having an inner diameter of 16 cm using a powder material containing a plastic fluid and a hard filler having the composition shown in Table 1.
Specifically, as shown in Table 2, the powder material was sandwiched from both sides with two flat pushers and pressed.
And about the obtained seismic isolation plug, the air content rate, the flatness degree of an end surface, the external appearance, and the attenuation | damping performance were evaluated by the method similar to Example 1. FIG. The results are shown in Table 2.

(Comparative Example 1)
A seismic isolation plug was manufactured in the same manner as in Example 1 except that the shapes of the wedge-shaped pusher and the wedge groove-shaped pusher used in the pre-press molding process were changed as shown in Table 2.
And about the obtained seismic isolation plug, the air content rate, the flatness degree of an end surface, the external appearance, and the attenuation | damping performance were evaluated by the method similar to Example 1. FIG. The results are shown in Table 2.

  From Table 2, it can be seen that the seismic isolation plugs of Examples 1 to 4 have a lower air content than the seismic isolation plug of Conventional Example 1, and thus can exhibit excellent damping performance. Further, the seismic isolation plugs of Examples 1 to 4 have a smaller end face flatness value than the seismic isolation plug of Comparative Example 1 (that is, the end face is flat), and the occurrence of molding defects is suppressed. In addition, since the air content is low, it can be seen that excellent damping performance can be exhibited. In particular, the seismic isolation plug of Example 1 has a smaller end face flatness value than the seismic isolation plugs of Examples 2 to 4 (that is, the end face is flat), and the occurrence of molding defects is suppressed. And the air content is low.

  According to the manufacturing method and the manufacturing apparatus of the seismic isolation plug of the present invention, it is possible to manufacture the seismic isolation plug having a low air content while suppressing the occurrence of molding defects. Further, according to the present invention, it is possible to provide a seismic isolation plug having a flat end face and a low air content and excellent damping performance and displacement followability.

DESCRIPTION OF SYMBOLS 1 Mold 2 Powder material 3 Wedge shaped pusher 3A Cone shaped pusher 3B Pusher 4 Wedge groove shaped pusher 4A Mortar shaped pusher 4B Pusher 5 Planar pusher 20 Seismic isolation plug 31 Top side 32a, 32b Plane (pressurizing surface)
33a, 33b Pressure direction rearmost end 31A Vertex 31B Top surface 32A, 32B Pressure surface 33A, 33B Pressure direction rearmost edge 41 Base sides 42a, 42b Plane (pressure surface)
43a, 43b Pressure direction most advanced 41A Bottom point 41B Bottom face 42A, 42B Pressure direction 43A, 43B Pressure direction most advanced edge 50 Seismic isolation structure 51 Soft plate 52 Hard plate 53 Hollow part 54 Laminate 55 Sealing plate 56 Flange Plate 57 Covering material 61 Mold

Claims (12)

A method of manufacturing a seismic isolation plug for a seismic isolation structure by pressing a powder material containing a plastic fluid and a hard filler in a mold,
Preliminary pressurizing at least one side of the powder material filled in the mold using a concave pusher having a pressing surface with the central portion depressed in the direction opposite to the pressing direction with respect to the forefront of the pressing direction. A pressure molding process;
Pressurize at least the side of the powder material that has been pressed in the pre-pressing step using the concave pusher, using a flat pusher having a plane perpendicular to the pressing direction as a pressing surface. A final pressure molding process;
Including
The method for manufacturing a seismic isolation plug, wherein the concave pusher has a ratio of a length of a pressure surface in a pusher axial direction to a pusher outer diameter of less than 0.5. The concave pusher is a wedge groove type pusher having, as a pressing surface, two planes intersecting at the base located in the direction opposite to the pressing direction from the pressing direction foremost,
The method for manufacturing a seismic isolation plug according to claim 1, wherein the two planes intersect at an angle of more than 90 ° as measured from an acute angle side. The powder material in the mold is pressure-molded by sandwiching from both sides with a pusher,
In the pre-pressing molding step, the powder material is pressed from one side by the concave pusher, and a convex pusher having a pressing surface whose central portion protrudes in the pressing direction with respect to the rearmost end in the pressing direction. The method for manufacturing a seismic isolation plug according to claim 1, wherein pressure is applied from the other side.   The ratio of the length of the pressing surface in the pusher axial direction to the outer diameter of the pusher of the convex pusher is larger than the ratio of the length of the pressing surface in the axial direction of the pusher to the outer diameter of the concave pusher. The manufacturing method of the seismic isolation plug of Claim 3.   The said convex-shaped pusher is a wedge-shaped pusher which has two planes which cross | intersect on the top side located in the pressurization direction side rather than the pressurization direction rearmost end as a pressurization surface. Manufacturing method for seismic isolation plugs.   The seismic isolation plug manufactured using the manufacturing method of the seismic isolation plug in any one of Claims 1-5.   A seismic isolation plug comprising a powder material containing a plastic fluid and a hard filler, having an air content of 3.0% or less and a flatness of an end face of 1.0% or less. . An apparatus for producing a seismic isolation plug for a seismic isolation structure by pressing a powder material containing a plastic fluid and a hard filler in a mold,
A mold filled with the powder material;
A plurality of pushers used to press the powder material in the mold;
A pusher exchange mechanism for exchanging a pusher used for pressurizing the powder material;
With
The plurality of pushers include a concave pusher having a pressing surface in which a central portion is recessed in a direction opposite to the pressing direction with respect to the leading edge in the pressing direction, and a flat pusher having a plane orthogonal to the pressing direction as a pressing surface. Contains
An apparatus for manufacturing a seismic isolation plug, wherein the concave pusher has a ratio of a length of a pressing surface in a pusher axial direction to a pusher outer diameter of less than 0.5. The concave pusher is a wedge groove type pusher having, as a pressing surface, two planes intersecting at the base located in the direction opposite to the pressing direction from the pressing direction foremost,
The seismic isolation plug manufacturing apparatus according to claim 8, wherein the two planes intersect at an angle of more than 90 ° as measured from an acute angle side.   The seismic isolation plug manufacturing apparatus according to claim 8 or 9, further comprising a convex pusher having a pressing surface whose central portion protrudes in the pressing direction with respect to the rearmost end in the pressing direction as the plurality of pushers.   The ratio of the length of the pressing surface in the pusher axial direction to the outer diameter of the pusher of the convex pusher is larger than the ratio of the length of the pressing surface in the axial direction of the pusher to the outer diameter of the concave pusher. The manufacturing apparatus of the seismic isolation plug of Claim 10.   The said convex pusher is a wedge-shaped pusher which has as a pressurization surface two planes which cross | intersect the apex located in the pressurization direction side rather than the last end of a pressurization direction, It is characterized by the above-mentioned. Seismic isolation plug manufacturing equipment.

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