JP5628651B2 - Seismic isolation plug manufacturing method and manufacturing apparatus - Google Patents

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, and a manufacturing apparatus therefor.

  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 is proposed that uses a pusher having a conical shape whose central portion protrudes in the pressing direction from the outer peripheral portion at one end on the pressing surface side. (For example, refer to Patent Document 2). Specifically, as shown in FIGS. 7A and 7B, the powder material 73 in the cylindrical mold 71 is centered using a conical pusher 72 having a conical shape 72a at one end on the pressing surface side. After the pressure forming to the shape in which the part is depressed, as shown in FIGS. 7 (c) to 7 (d), the powder material 73 that has been pressure formed to the shape in which the central part is depressed is pressed again by the flat pusher 74. A method for manufacturing a cylindrical seismic isolation plug 80 by molding has been proposed. According to this method of manufacturing a seismic isolation plug, since the powder material that has been pressure-molded into a shape in which the central portion is depressed using a conical pusher is pressure-molded again with a flat pusher, the flow of the powder material The air in the powder material escapes and a seismic isolation plug with a low air content can be obtained.

JP 2006-316990 A JP 2010-253848 A

  However, in the conventional method for manufacturing a seismic isolation plug using a conical pusher and a flat pusher, the powder material that has been press-molded into a shape in which the central portion is depressed is pressed again with a flat pusher, and both ends of the seismic isolation plug are 7 is pressed into a flat shape, the recess 82 may remain in the center of the end surface 81 of the manufactured seismic isolation plug 80 as shown in FIG. That is, in the conventional method of manufacturing a seismic isolation plug using a conical pusher and a flat pusher, the end face of the seismic isolation plug does not become flat, a molding defect occurs, and desired damping performance, displacement followability, etc. There were times when I could not get.

  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.

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. A method of manufacturing a seismic isolation plug for a seismic isolation structure by pressure molding with the powder material in the mold being pressed from both sides with a pusher and filled in the mold one side of the powder material, along with pressurized using a wedge-shaped pusher having two planes that intersect at the top side located in the pressurizing direction side as pressing surface, the other side of the powder material, wedge pusher or pressure A pre-pressing step of pressing with a flat pusher having a plane perpendicular to the direction as a pressing surface, and the powder material pressed with a wedge-shaped pusher in the pre-pressing step is pressed from both sides with a flat pusher. Final seismic isolation plug Look including a molding step, prior to the preliminary pressing step, the powder material filled in the mold, whereas with pressurized with wedge pusher from the side, inward from the pressing direction outermost end It further includes a pretreatment step of pressurizing from the other side with a wedge groove type pusher having two planes intersecting at the bottom located at the bottom as a pressurizing surface . In this way, if the powder material is pressurized using a wedge-shaped pusher in the pre-press molding step, the powder material can be forced to flow in the mold to remove the air mixed in the powder material. As a result, a seismic isolation plug with a low air content can be manufactured. In addition, in the final pressure forming process after the pre-press forming process, if the powder material pressed with the wedge-shaped pusher is pressed with a flat pusher, the occurrence of molding defects on the end face of the seismic isolation plug can be suppressed. . Furthermore, if the powder material is pressurized from both sides with the wedge-shaped pusher and the wedge groove-shaped pusher in the pretreatment process, the powder material is further flowed in the mold to sufficiently remove the air mixed in the powder material. Therefore, the air content of the seismic isolation plug can be further reduced. In addition, if the pretreatment process is performed before the pre-press molding process, the occurrence of molding defects on the end face of the seismic isolation plug can be suppressed even if a wedge groove type pusher is used in the pretreatment process.

Here, the manufacturing method of the seismic isolation plug of the present invention, in the preliminary pressing step, the powder material, while the planar pusher from the other side with pressurized with wedge pusher from the side pressurizing said final pressure In the molding step, the powder material is preferably pressed with a flat pusher from both sides. This is because, when the powder material is pressed from both sides in the pre-press molding process, if one of the pushers is a flat pusher, the occurrence of molding defects on the end face of the seismic isolation plug can be further suppressed. In addition, since the flat pushers used in the pre-press molding process can be used as they are in the final press-molding process, the number of pushers to be replaced when moving from the pre-press molding process to the final press molding process is reduced. This is because the seismic isolation plug can be manufactured efficiently.

  In the method of manufacturing a seismic isolation plug according to the present invention, it is preferable that the powder material is pressurized a plurality of times while changing the extending direction of the top side of the wedge-shaped pusher in the preliminary pressure forming step. This is because if the extending direction of the top side of the wedge-shaped pusher is changed and pressed several times, the end face on the flat pusher side can be further flattened by allowing the powder material to flow evenly to every corner. Further, 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.

Furthermore, the manufacturing method of the seismic isolation plug of the present invention, in the preliminary pressing step, the powder material, pressurized with wedge pusher from both sides, in the final pressing step, the powder material, both sides It is preferable to apply pressure with a flat pusher. When pressing the powder material from both sides in the pre-press molding process, if both pushers are wedge-shaped pushers, the powder material will flow more greatly in the mold and the air mixed in the powder material will be sufficient. This is because the air content of the seismic isolation plug can be further reduced. In addition, in the final pressing process after the pre-pressing process, if the powder material pressed with the wedge-shaped pusher is pressed with a flat pusher, the occurrence of molding defects on both end faces of the seismic isolation plug can be suppressed. Because it can.

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 exchange mechanism for exchanging a pusher used for pressurizing the powder material. The plurality of pushers pressurize the powder material by sandwiching it from both sides. a wedge-shaped pusher having two planar as pressurizing surfaces that intersect at the top side located in the pressure direction, a plane perpendicular to the pressing direction and the plane pusher having a pressing surface, inward of the pressing direction outermost end Two planes that intersect at the bottom It includes a Kusabimizogata pusher having a pressing surface, and, wherein the plurality of pushers, and a pair of wedge pusher and Kusabimizogata pusher, a pair of wedge-shaped pusher, or a pair of wedge pusher and planar pusher, a pair The planar pusher is included . In this way, if a wedge-shaped pusher is provided, the powder material is pressurized using the wedge-shaped pusher to forcibly flow the powder material in the mold and remove air mixed in the powder material. Therefore, it is possible to manufacture a seismic isolation plug with a low air content. Further, if a flat pusher and a pusher exchange mechanism are provided, the powder material pressed by the wedge-shaped 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 addition, if a wedge-shaped pusher and a wedge-groove pusher are provided, the powder material is pressed from both sides by the wedge-shaped pusher and the wedge-groove pusher, so that the powder material flows more greatly in the mold and is contained in the powder material. Since the air mixed in can be sufficiently removed, 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)-(i) 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. (A)-(e) is a figure explaining the process of manufacturing a seismic isolation plug using the manufacturing method of another seismic isolation plug according to this invention. (A)-(e) is a figure explaining the process of manufacturing a seismic isolation plug using the manufacturing method of the conventional seismic isolation plug using a cone pusher. It is a figure explaining the calculation method of the volume of a seismic isolation plug, and the flatness degree of an end surface. 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. 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 57 and a disk-shaped sealing plate 56 fixed to both ends (upper end and lower end) of 54, and a rubber covering material 58 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 55 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 55.

  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 type pusher 3, the wedge groove type pusher 4, and the plane pusher 5 are used in a predetermined order and combination. Seismic isolation plugs are manufactured by pressing the powder material in the mold. 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. As described above, the pusher has two flat surfaces 32a and 32b intersecting at the apex 31 projecting in the pressurizing direction side (the upper side in FIGS. 3A and 3B). That is, at the tip of the wedge-shaped pusher 3, the cross section perpendicular to the apex 31 has a V shape that is convex in the pressurizing direction, and the direction orthogonal to both the extending direction of the apex 31 and the pressurizing 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 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 easy insertion of the wedge-shaped pusher 3 straight 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. Furthermore, the angle at which the two flat surfaces 32a and 32b of the wedge-shaped pusher 3 intersect can be changed as appropriate.

  The wedge-groove pusher 4 is shown in FIG. 4A, a side view in FIG. 4B, and a plan view in FIG. Furthermore, the bottom side 41 (in other words, the pressure direction outermost ends 43a, 43b of the wedge groove type pusher 4) is depressed on the opposite side to the pressure direction side (the upper side in FIGS. 4A and 4B). The pusher has two planes 42a and 42b intersecting at the bottom 41) located on the inner side. 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. The tip of the wedge-shaped pusher 4 has a shape corresponding to the shape of the tip of the wedge-shaped pusher 3, and the groove having a V-shaped cross section of the wedge-shaped pusher 4 protrudes in the pressurizing direction of the wedge-shaped pusher 3. The shape corresponds to the V-shaped cross section.

  In the wedge groove pusher 4 shown in FIG. 4, the bottom 41 is positioned in the center of the wedge groove pusher 4 in plan view from the viewpoint of making the shape of the wedge groove pusher 4 correspond to the shape of the wedge pusher 3. 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. Furthermore, the angle at which the two flat surfaces 42a and 42b of the wedge-shaped pusher 4 intersect can be changed as appropriate.

  The plane pusher 5 is a pusher having a plane orthogonal to the pressing direction as a pressing surface. The flat shape of the flat pusher 5 is substantially the same as the cross-sectional shape perpendicular to the pressing direction of the hollow portion of the mold filled with the powder material.

  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)-(d), 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 groove pusher 4 is inserted into the mold 1 from the other side (lower side in FIG. 1) of the powder material 2 to press the powder material 2. 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. That is, 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 between the first pressurization and the second pressurization. Is pressurized twice. Thereafter, as shown in FIG. 1D, the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 are extracted from the mold 1 (pretreatment step).

  Here, in this pretreatment step, since the powder material 2 is sandwiched and pressed by the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4, the powder material 2 is forced to flow in the mold 1, The air in the powder material 2 escapes. In this pretreatment step, 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 between the first pressurization and the second pressurization. Therefore, the flow of the powder material 2 in the mold 1 is strongly promoted, and the air in the powder material 2 is sufficiently released. In addition, when the powder material flows in the mold, the air in the powder material escapes and the air content of the seismic isolation plug decreases. This is presumably because the materials are closely arranged.

  Incidentally, in the pretreatment step, from the viewpoint of favorably flowing the powder material 2 in the mold 1, 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 However, in the method for manufacturing a seismic isolation plug 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 can be any angle as long as the extending directions of the top side 31 and the bottom side 41 can be changed (that is, other than 180 °). However, from the viewpoint of allowing the powder material 2 to flow evenly to every corner in the mold 1, 90 ° is preferable. 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.

  Next, in the manufacturing method of the seismic isolation plug of this example, as shown in FIGS. 1E to 1H, the powder pressed using the wedge shaped pusher 3 and the wedge groove shaped pusher 4 in the pretreatment process. The material 2 is pressed by being sandwiched from both sides by a pair of wedge-shaped pushers 3 and a flat pusher 5 opposed to each other in the pressing direction. Specifically, first, as shown in FIG. 1 (e), a wedge-shaped pusher 3 is inserted into the mold 1 from one side (upper side in FIG. 1) of the powder material 2, and the other side of the powder material 2 A flat pusher 5 is inserted into the mold 1 from the side (lower side in FIG. 1) to pressurize the powder material 2. Next, as shown in FIG. 1 (f), after the wedge-shaped pusher 3 and the flat pusher 5 are extracted from the mold 1, the wedge-shaped pusher 3 is rotated by 90 °, for example, as shown in FIG. The powder material 2 is sandwiched from both sides by the wedge-shaped pusher 3 and the flat pusher 5 that have been rotated. That is, the extending direction of the apex 31 of the wedge-shaped pusher 3 is made different between the first pressurization and the second pressurization after the pretreatment step, and the powder material 2 is pressed twice. Thereafter, as shown in FIG. 1 (h), the wedge-shaped pusher 3 and the flat pusher 5 are extracted from the mold 1 (pre-pressurizing process).

  Here, according to the study of the present inventor, when the pressure molding is performed using only the flat pusher from both sides to the powder material molded into a shape corresponding to the shape of the wedge groove type pusher (wedge shape) The powder material does not flow sufficiently in the mold, and the outer peripheral portion of the seismic isolation plug (particularly, the powder material that has been formed into a wedge shape by the wedge groove type pusher in the pressure direction of the wedge groove type pusher 4) In some cases, the vicinity of the positions corresponding to the outer ends 43a and 43b is recessed from other portions, and molding defects may occur. However, in this pre-press molding process, the powder material 2 is sandwiched and pressed by the wedge-shaped pusher 3 and the flat pusher 5, so that the flow of the powder material 2 in the mold 1 is promoted, and the powder material 2 and the surface on the flat pusher 5 side (lower side in FIG. 1) of the powder material 2 formed into a shape (wedge shape) corresponding to the shape of the wedge groove pusher 4 in the pretreatment step is flat. become. Further, in this pretreatment step, the extending direction of the apex 31 of the wedge-shaped pusher 3 is different between the first pressurization and the second pressurization. The flow of 2 is further strongly encouraged. Therefore, the air in the powder material 2 is sufficiently removed and, for example, even when manufacturing a large-diameter seismic isolation plug having a diameter of 200 mm or more, the powder material is allowed to flow evenly and sufficiently in the mold, The surface on the flat pusher 5 side can be flattened.

  Incidentally, in the pre-press molding process, the number of times of pressing the powder material 2 may be appropriately changed according to the diameter of the seismic isolation plug to be manufactured and the composition of the powder material. Furthermore, the angle at which the wedge-shaped pusher 3 is rotated can be any angle as long as the extending direction of the apex 31 can be changed (that is, other than 180 °). From the viewpoint of allowing the material 2 to flow evenly to every corner, 90 ° is preferable. Further, the extending direction of the apex 31 of the wedge-shaped pusher 3 when the powder material 2 is pressed by the wedge-shaped pusher 3 and the flat pusher 5 after the pretreatment step is shown in FIG. It is preferable to make it different from the extending direction of the top side 31 of the wedge-shaped pusher 3 at the time of the final pressurization in the pretreatment step as shown in 1 (e). In the method for manufacturing a seismic isolation plug according to the present invention, the extending direction of the apex 31 is adjusted by rotating a die filled with a powder material in a state where the positions of the wedge-shaped pusher and the flat pusher are fixed. You can change it.

  And finally, in the manufacturing method of the seismic isolation plug of this example, as shown to FIG.1 (i)-(k), as shown in FIG.1 (i)-(k), the powder pressurized using the wedge-shaped pusher 3 and the plane pusher 5 in the pre-press molding process. The body 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.

  Here, in this final pressure molding step, pressure is applied using the wedge-shaped pusher 3 and the flat pusher 5 in the pre-pressure molding step, and one side (the upper side in FIG. 1) corresponds to the shape of the wedge-shaped pusher 3 ( Since the powder material 2 formed in a wedge groove shape and flat on the other side (lower side in FIG. 1) is pressed from both sides by the flat pusher 5, the seismic isolation plug 20 having flat both end surfaces is provided. Can be obtained. Unlike the case of using a conventional conical pusher, the reason why the end face of the seismic isolation plug 20 becomes flat when the surface pressed with the wedge-shaped pusher 3 is pressed with the flat pusher 5 is not clear. However, when the powder material 2 is pressed using the wedge-shaped pusher 3, the end portion shape (wedge groove shape) of the powder material 2 is easy to flow toward the groove bottom when the powder material 2 is pressed by the flat pusher. It is inferred that it is a shape. Incidentally, in this final pressure molding process, the planar pusher used in the preliminary pressure molding process can be used as it is as the planar pusher 5 on the other side (lower side in FIG. 1). It is not necessary to replace the lower pusher when moving to the pressure molding process. Accordingly, it is possible to efficiently manufacture the seismic isolation plug while reducing the labor required for the replacement of the pusher.

  And according to the manufacturing method of the seismic isolation plug of this example, the powder material 2 is compulsorily carried out in the metal mold 1 by sequentially carrying out the pretreatment process, the pre-pressure forming process and the final pressure forming process. Since the air mixed and extracted in the powder material 2 can be extracted, 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.

  Next, another example of the manufacturing method of the seismic isolation plug of the present invention will be described with reference to FIG. The other example of the method for manufacturing a seismic isolation plug is the same as the previous example except that the powder material 2 is pressed from both sides by using a pair of wedge-shaped pushers 3 and 3 in the pre-press molding process. It has the same process as the manufacturing method of the seismic isolation plug.

  That is, the pre-processing steps of the other example manufacturing methods shown in FIGS. 5A to 5D are the same as the pre-processing steps of the previous example manufacturing method shown in FIGS. 1A to 1D. Can be implemented. 5 (g) to (i), the final pressure forming step of the other example manufacturing method shown in FIGS. 1 (i) to (k) is the final pressure forming of the previous example manufacturing method. It can be carried out in the same manner as the process.

  Here, in the pre-press molding step of the manufacturing method of this other example, as shown in FIGS. 5E to 5F, pressurization is performed using the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 in the pretreatment step. The pressed powder material 2 is pressed by being sandwiched from both sides by a pair of wedge-shaped pushers 3 and 3 facing each other in the pressing direction. Specifically, first, as shown in FIG. 5 (e), wedge-shaped pushers 3 and 3 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. 5 (f), the two wedge-shaped pushers 3 and 3 are extracted from the mold 1 (pre-pressure forming step). Incidentally, in the manufacturing method of this other example, when the final pressure forming step is carried out after the pre-press forming, the pushers on both sides (both up and down in FIG. 5) of the powder material 2 are replaced with flat pushers. .

  Here, in this pre-press molding process, the powder material 2 is pressed from both sides by the wedge-shaped pusher 3, so that the powder material 2 flows very well in the mold 1, and the powder material 2 Enough air to escape.

  In the pre-press molding process, the number of times the powder material 2 is pressed may be appropriately changed according to the diameter of the seismic isolation plug to be manufactured and the composition of the powder material. Further, the extending direction of the top side 31 of the wedge-shaped pusher 3 when the powder material 2 is pressed by the wedge-shaped pusher 3 after the pretreatment step is shown in FIG. As shown in FIG. 6, it is preferable that 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 each other at the time of the final pressurization in the pretreatment step.

  And according to the manufacturing method of the seismic isolation plug of this other example, similarly to the manufacturing method of the seismic isolation plug of the previous example, the pretreatment process, the pre-pressing process, and the final pressing process are sequentially performed. As a result, the powder material 2 can be forced to flow in the mold 1 and air mixed in the powder material 2 can be removed, so that 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.

  Here, the seismic isolation plug manufactured using the manufacturing method of the seismic isolation plug of the above example and the other examples has an air content of, for example, 3.5% or less, and a flatness of the end surface is, for example, 1.5. % Or less, preferably 1.0% or less. And when used for a seismic isolation structure, it exhibits very good damping performance and displacement followability.

  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 manufacturing method of the seismic isolation plug 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. 6 (a) to 6 (e), one end is closed. Alternatively, the powder material 2 filled in the 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. 6A, first, one side of the powder material 2 filled in the mold 61 (FIG. 6). Then, the wedge-shaped pusher 3 is inserted into the mold 61 from the upper side, and the powder material 2 is pressurized (pre-pressure forming step). Next, as shown in FIG. 6 (b), after the wedge-shaped pusher 3 is extracted from the mold 61, as shown in FIG. 6 (c), a plane is formed from one side (upper side in FIG. 6) of the powder material 2. The pusher 5 is inserted into the mold 61, and the powder material 2 is pressurized again (final pressure molding step). And finally, as shown in FIG.6 (d), the seismic isolation plug 20 as shown in FIG.6 (e) can be obtained by extracting the plane pusher 5 from the metal mold | die 61. FIG.

  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 pretreatment process, a wedge material pusher and a wedge pusher are sandwiched and pressed by a wedge-shaped pusher and a wedge groove-shaped pusher, and then a pre-pressing process is performed. And pressed the powder material from both sides. 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 pretreatment step, the powder material is pressed a total of four times while rotating the wedge-shaped pusher and the wedge groove-shaped pusher by 90 °, and in the pre-press forming step, the wedge-shaped pusher and the planar pusher are rotated by 90 °. The powder material was pressed a total of 2 times.
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 8 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 55 ( d _av = (d ₁ + d ₂ + d ₃ + d ₄ ) / 4). Further, 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 55 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. 8, 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 end face of the seismic isolation plug 55 and the central 1 location. , H ₅ ) were measured with calipers. Further, as shown in FIG. 8, 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 55 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. 9 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. 9 increases, 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.

(Example 2)
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 pretreatment step, the powder material is sandwiched and pressed from both sides by a wedge-shaped pusher and a wedge-groove pusher, and then, as a pre-press molding step, the powder material 2 Two wedge-shaped pushers were sandwiched from both sides and pressurized once in total. 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 pretreatment step, the powder material was pressurized 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, 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.

( Reference Example 3)
A seismic isolation plug was produced in the same manner as in Example 1 except that the pretreatment process was not carried out and the operation of the pre-press molding process was changed as shown in Table 2.
Specifically, as shown in Table 2, as a pre-pressing molding process, the powder material is sandwiched and pressed from both sides by a wedge-shaped pusher and a wedge groove-shaped pusher, and then the final pressure molding process is performed. Was sandwiched from both sides with two flat pushers and pressurized 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, 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 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-pressing molding process, the powder material is sandwiched and pressed from both sides by two conical pushers, and then the final pressing process is performed by two flat pushers. The body material was sandwiched from both sides and pressurized.
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, the seismic isolation plugs of Examples 1 and 2 and Reference Example 3 manufactured using a wedge-shaped pusher have a small end face flatness value (that is, the end face is flat), and the occurrence of molding defects occurs. In addition to being suppressed, the air content is low, so that it can be seen that excellent damping performance can be exhibited. In addition, the seismic isolation plugs of Examples 1 and 2 in which the pretreatment process was performed before the pre-press molding process are extremely excellent because the occurrence of molding defects is further suppressed and the air content is particularly low. It can be seen that the damping performance can be exhibited. On the other hand, it can be seen that the seismic isolation plug of Conventional Example 1 manufactured using only the flat pusher cannot obtain a sufficiently high damping performance because of its high air content. In addition, the seismic isolation plug of Comparative Example 1 manufactured using the conical pusher has a large flatness value (that is, the end surface is not flat), and a molding defect occurs, so that sufficiently high damping performance is obtained. I can't understand.

  According to the manufacturing method and 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.

1 Mold 2 Powder material 3 Wedge shaped pusher 4 Wedge groove shaped pusher 5 Planar pusher 20 Seismic isolation plug 31 Top side 32a, 32b Plane 41 Bottom side 42a, 42b Plane 43a, 43b Outermost end 50 Seismic isolation structure 51 Soft plate 52 Hard plate 53 Hollow portion 54 Laminated body 55 Seismic isolation plug 56 Sealing plate 57 Flange plate 58 Covering material 61 Mold 71 Die 72 Conical pusher 72a Conical shape 73 Powder material 74 Flat pusher 80 Seismic isolation plug 81 End face 82 Recess

Claims (5)

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,
The powder material in the mold is pressure-molded by sandwiching from both sides with a pusher,
One side of the powder material filled into the mold, with pressurized using a wedge-shaped pusher having two planes that intersect at the top side located in the pressurizing direction side as pressure surface, the other side of the powder material A pre- press molding step of pressing with a wedge-shaped pusher or a plane pusher having a plane perpendicular to the pressing direction as a pressing surface ;
A final pressure forming step in which the powder material pressed with a wedge-shaped pusher in the pre-press forming step is pressed from both sides with a flat pusher to form a seismic isolation plug;
Only including,
Before the pre-pressing step, the powder material filled in the mold is pressed with a wedge-shaped pusher from one side and intersects at the bottom located inward from the outermost end in the pressing direction. A method of manufacturing a seismic isolation plug, further comprising a pretreatment step of pressurizing from one side with a wedge groove type pusher having one flat surface as a pressurizing surface . In the pre-press molding step, the powder material is pressurized with a wedge-shaped pusher from one side and with a flat pusher from the other side,
The method for manufacturing a seismic isolation plug according to claim 1, wherein in the final pressure forming step, the powder material is pressed with a flat pusher from both sides.   3. The method for manufacturing a seismic isolation plug according to claim 2, wherein in the pre-pressing step, the powder material is pressed a plurality of times with different extending directions of the tops of the wedge-shaped pushers. In the pre-press molding step, the powder material is pressed with a wedge-shaped pusher from both sides,
The method for manufacturing a seismic isolation plug according to claim 1, wherein in the final pressure forming step, the powder material is pressed with a flat pusher from both sides. 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;
And pressurizing the powder material from both sides with the plurality of pushers ,
Wherein the plurality of pushers, a planar pusher having a wedge-shaped pusher having two planes that intersect at the top side located in the pressurizing direction side as pressing surface, the plane perpendicular to the pressing direction as a pressing surface, the pressing direction A wedge groove type pusher having, as pressure surfaces, two planes intersecting at the bottom located inward from the outermost end , and
The plurality of pushers include a pair of wedge-shaped pushers and a wedge groove-shaped pusher, a pair of wedge-shaped pushers, or a pair of wedge-shaped pushers and a plane pusher, and a pair of plane pushers. Plug manufacturing equipment.

Images