JP5590816B2 - Method for manufacturing seismic isolation plug for seismic isolation device and manufacturing apparatus therefor - Google Patents

Description

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

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

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

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

JP 2006-316990 A

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

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

In order to achieve the above-mentioned object, the first invention is to form a seismic isolation plug for a seismic isolation device by performing pressure molding on a powder material filled in a mold having a middle mold forming a side wall. At the same time as moving the stamper that compresses the powder material in the pressurizing direction, external force is applied to the middle mold and the middle mold is moved in the direction opposite to the pressurizing direction , at the interface between the middle mold and the powder material. A method for manufacturing a seismic isolation plug, wherein pressure forming is performed so that shear stress is generated.

In the first invention, the stamper has an inclined stamper having a flat pressing surface inclined with respect to the pressing direction, or a cone-shaped pressing surface having a central portion protruding in the pressing direction from the outer peripheral portion. A cone stamper is preferred.

A second invention is a seismic isolation plug for a seismic isolation device, comprising a mold having a middle mold filled with a powder material and forming a side wall, and a stamper for pressure molding the powder material in the mold. In the manufacturing apparatus, the middle mold of the mold is movable in the direction opposite to the pressing direction when the stamper is moved in the pressing direction to press the powder material. This is a plug manufacturing apparatus. At this time, the stamper is an inclined stamper having a flat pressing surface inclined with respect to the pressing direction, or a cone stamper having a cone-shaped pressing surface whose central portion protrudes in the pressing direction from the outer peripheral portion. Preferably there is.

  According to the present invention, when a powder material that is a substitute material for lead is used and pressed, the powder material is compressed using the compressive force efficiently, and the air content is small. A molded product can be obtained. Therefore, it is possible to provide a seismic isolation plug that greatly contributes to the improvement of the damping performance and displacement followability of the seismic isolation device. In addition, it is possible to provide a manufacturing apparatus suitable for manufacturing a seismic isolation plug having a small air content.

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

  Next, embodiments of the present invention will be described with reference to the drawings. FIGS. 1A to 1C are views showing a manufacturing process of the seismic isolation plug according to the present embodiment. FIG. 2A is a top view of the seismic isolation device in which the seismic isolation plug manufactured according to the present embodiment is press-fitted, and FIG. 2B is a cross-sectional view of the seismic isolation device. FIG. 3 (a) is a diagram showing the mutual arrangement of hard fillers of powder material that is not sufficiently compressed, and FIG. 3 (b) is an illustration of hard fillers of powder material that is sufficiently compressed. It is the figure which showed mutual arrangement | positioning. 4 (a) to (f), FIGS. 5 (a) to (f), and FIGS. 6 (a) to (h) are diagrams showing manufacturing steps of other seismic isolation plugs according to the present embodiment. .

  As shown in FIG. 1, the seismic isolation plug manufacturing apparatus 1 according to the present embodiment is filled with a powder material 2 composed of a plastic fluid A and a hard filler B, and a cylindrical mold in which a middle mold is movable. 3 and a stamper 5 having a pressing surface 4 for pressing the powder material 2 in the mold 3. The stamper 5 is a flat stamper 5a having a flat pressing surface 4a orthogonal to the pressing direction. Using such a manufacturing apparatus, as shown in the manufacturing process of FIGS. 1A to 1C, the powder material 2 filled in the mold 3 is pressed by a flat stamper 5 a for the seismic isolation device. The seismic isolation plug 6 is formed. Details will be described below.

First, as shown in FIG. 1 (a), the mold 3 is filled with a powder material 2 composed of a plastic fluid A and a hard filler B, which are materials for the seismic isolation plug 6. Next, as shown in FIG. 1B, the planar stamper 5a is moved in the direction of the arrow α, and at the same time, the middle mold 7 that forms the side wall of the mold 3 is moved in a direction opposite to the pressing direction of the planar stamper 5a ( (In the direction of arrow β). By doing so, the frictional force (arrow γ) between the powder material 2 on the middle mold side of the mold 3 and the middle mold 7 of the mold 3 is used to compressively deform the flat stamper 5a (arrow Δ). Is combined, and shear stress is generated at the interface between the middle mold and the powder material 2, and the powder material 2 is also strongly compressed, so that the seismic isolation plug 6 having a reduced air content is obtained. And as shown in FIG.1 (c), the seismic isolation plug 6 is extracted from the metal mold | die 3, and is press-fitted into the seismic isolation apparatus 8 as shown in FIG. As the seismic isolation device 8, for example, as shown in FIGS. 2A and 2B, a laminated body 11 in which rubber plates 9 and steel plates 10 are alternately laminated, and a center of the laminated body 11. Some have a seismic isolation plug 6 arranged. In the manufacturing method shown in FIG. 1, the middle mold 7 of the mold 3 is pressure-molded while being moved in the direction opposite to the pressing direction. Even if it is moved, the flow of the powder material 2 in the vicinity of the middle mold 7 is promoted and can be effectively compressed. A manufacturing method in which pressure molding is performed while moving in a direction parallel to the direction is also included in the present invention. Comparing the two, while moving the medium-sized 7 of the die 3 to the pressure direction parallel than to compression molding, while the medium-sized 7 of the die 3 is moved in a direction opposite to the direction of pressure pressurized When the pressure molding is performed, the shear stress generated at the interface between the middle mold 7 and the powder material 2 is increased, so that the flow of the powder material 2 is strongly promoted. Therefore, from the viewpoint of effective compression, it is preferable to perform pressure molding while moving the middle mold 7 of the mold 3 in the direction opposite to the pressure direction, as shown in FIG.
In addition, the mutual arrangement of the powder material is such that the seismic isolation plug manufactured by the conventional seismic isolation plug manufacturing apparatus does not sufficiently compress the powder material. The gap between the materials was large, and the arrangement was such that air remained easily. On the other hand, when the seismic isolation plug is manufactured by the above-described seismic isolation plug manufacturing apparatus according to the present invention, the gap between the powder materials is reduced, and the powder material hardly retains air as shown in FIG. It will be the closest arrangement.

  Moreover, as shown in the manufacturing process of FIG. 4, it is preferable to pressure-mold using the inclination stamper 5b which has the planar pressurization surface 4b inclined with respect to the pressurization direction. In this manufacturing process, first, as shown in FIG. 4A, the mold material 3 is filled with the powder material 2, and then, as shown in FIG. 4B, the inclined stamper 5b is moved in the direction of the arrow α. At the same time, the middle mold 7 of the mold 3 is moved in the direction opposite to the pressurizing direction by the stamper (in the direction of arrow β), and the inclined stamper 5b is applied to the powder material 2 by the pressing surface 4b of the inclined stamper 5b. The pressure receiving surface 7 of the powder material 2 is strongly compressed by using the frictional force of the middle mold 7 of the mold 3 as described above while promoting the oblique flow with respect to the pressing direction of the powder material 2. Is deformed to a shape corresponding to the shape of the pressing surface 4b. Thereafter, as shown in FIG. 4C, while the middle mold 7 of the mold 3 is moved to the original position (moved in the direction of arrow β ′), the inclined stamper 5b is pulled up in the direction of arrow α ′, By rotating, for example, 180 ° about the axis X of the inclined stamper 5b, the shape of the pressure surface 4b facing the pressure-receiving surface 12 given in the first pressure molding is changed to a shape different from the first time. Then, as shown in FIG. 4 (d), the inclined stamper 5b is moved again in the direction of arrow α, and at the same time, the middle mold 7 of the mold 3 is moved in the direction opposite to the pressurizing direction of the inclined stamper 5b (arrow β ”And pressurizing the pressure receiving surface 12 of the powder material 2 in the direction of the arrow α” by the pressure surface 4b, and promoting the oblique flow with respect to the pressure direction of the powder material 2. By compressing the powder material strongly by using the frictional force of the middle mold 7 of 3, the shape of the pressure receiving surface 12 of the powder material 2 is deformed to a shape corresponding to the shape of the new pressure surface 4b. Compared with the case where the powder material 2 is pressure-molded by the flat stamper 5a as shown in FIG. 1 by the above process, the flow of the powder material 2 is promoted, and therefore the seismic isolation plug 6 further reducing the air content. Is obtained. The seismic isolation plug 6 thus obtained can be directly used for press-fitting into the seismic isolation device 8, but is preferably molded by the steps shown in FIGS. 4 (e) to (f). . That is, as shown in FIG. 4 (e), the powder material 2 is extracted from the mold 3, and the protruding portion of the pressure-receiving surface 12 is cut along the dotted line in the figure. The shape is adjusted (planar shape perpendicular to the pressing direction), and the formation of the seismic isolation plug 6 as shown in FIG.

  Alternatively, the shape of the pressure receiving surface 12 of the seismic isolation plug 6 can be made to be a plane shape orthogonal to the pressurizing direction by the following steps instead of the steps shown in FIGS. 4 (e) to 4 (f). . That is, although illustration is omitted, after the step shown in FIG. 4D, the inclined stamper 5b is replaced with a flat stamper 5a having a flat pressing surface 4a orthogonal to the pressing direction of the stamper 5, and this is used. Then, the seismic isolation plug 6 is pressurized, the shape of the seismic isolation plug 6 is adjusted (planar shape orthogonal to the pressing direction), and the molding can be completed. Although this is a secondary effect, in this manufacturing process, there is no step of cutting the powder material 2 as in the manufacturing step shown in FIG. In the production of the seismic isolation plug 6, the powder material can be used without waste. This is preferable from the viewpoint of reducing the production cost of the seismic isolation plug 6.

  Alternatively, as shown in the manufacturing process of FIG. 5, it is preferable to perform pressure molding using a cone stamper 5c having a cone-shaped pressure surface 4c whose central portion protrudes in the pressure direction from the outer peripheral portion. . In this manufacturing process, as shown in FIG. 5A, the mold material 3 is filled with the powder material 2, and then, as shown in FIG. 5B, the cone stamper 5c is moved in the direction of the arrow α. At the same time, the middle mold 7 of the mold 3 is moved in the direction opposite to the pressurizing direction by the cone stamper 5c (in the direction of the arrow β), and the friction force by the middle mold 7 of the mold 3 is used to make the powder. While the material is strongly compressed, the powder material 2 is pressure-molded by the cone-shaped pressure surface 4c, and the shape of the pressure-receiving surface 12 of the powder material 2 is in the central portion as compared with the peripheral portion on the mold side. Transform into a depressed cone shape. Next, as shown in FIG. 5C, while moving the middle mold 7 of the mold 3 to the original position (moved in the direction of the arrow β ′), the cone stamper 5c is moved in the direction opposite to the pressing direction ( Pull up in the direction of arrow α ′). Then, as shown in FIG. 5D, the cone stamper 5c is replaced with a flat stamper 5a having a flat pressing surface 4a orthogonal to the pressing direction. Next, as shown in FIG. 5E, the planar stamper 5a is moved in the direction of the arrow α ″, and at the same time, the middle mold 7 of the mold 3 is moved in the direction opposite to the pressurizing direction by the planar stamper 5a (arrow β ″). The pressure receiving surface 12 of the powder material 2 is pressed by the pressing surface 4a of the flat stamper 5a while the powder material is strongly compressed using the frictional force of the middle mold 7 of the mold 3. By doing so, the shape of the pressure receiving surface 12 of the powder material 2 is made planar. In this pressurization step, the deformation amount of the peripheral portion 12a on the pressure receiving surface 12 is particularly large, so that the flow of the powder material 2 on the mold 3 side is strongly promoted, and as a result, the seismic isolation with a further reduced air content rate. A plug 6 is obtained. And the seismic isolation plug 6 pressure-molded in this way is extracted from the mold 3 and used for press-fitting into the seismic isolation device 8 as shown in FIG. When the powder material 2 is pressure-molded by the process as described above, mainly the flow of the powder material 2 on the mold side is promoted, and the gap between the powder materials 2 is reduced. It will be closer to the arrangement as shown in FIG. As a result, the air content of the seismic isolation plug 6 is reduced, and the seismic isolation device in which the seismic isolation plug 6 is press-fit improves both the damping performance and the displacement follow-up performance.

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

  Alternatively, as shown in the manufacturing process of FIG. 6, the powder material 2 is formed using a pair of opposed stampers (in the illustrated example, a combination of inclined stampers 5 b and 5 b ′ and a combination of flat stampers 5 a and 5 a ′). It is preferable to perform pressure molding from two directions so as to sandwich the film. As shown in FIGS. 6A to 6E, a pair of inclined stampers 5b and 5b ′ having pressurizing surfaces 4b and 4b ′ are used to move the middle mold 7 of the mold 3 in a stepwise manner. When the powder material 2 is pressure-formed from the direction, the powder material 2 is made uniform as a whole as compared with the case where the powder material 2 is pressure-formed from one direction by a single inclined stamper 5b as shown in FIG. The air content of the powder material 2 can be further reduced while being compressed. And as shown to FIG.6 (f)-(g), by pressurizing the powder material 2 using a pair of plane stamper 5a, 5a 'which each has planar pressure surface 4a, 4a', Compared to the case where the powder material 2 is pressed from one direction by a single flat stamper 5a as shown in FIG. 1, the powder material 2 is uniformly compressed as a whole, while the pressure receiving surface 12 of the powder material 2 is compressed. Since the shape is formed into a flat shape, it is possible to manufacture the seismic isolation plug 6 (FIG. 6 (h)) with a further reduced air content. The seismic isolation device 8 including the seismic isolation plug 6 further improves the damping performance and the displacement followability. Also, as shown in FIG. 1, the time required for the powder material to have a desired air content is shortened by pressure molding from a plurality of directions, rather than by pressure molding from one direction. Productivity of the seismic plug 6 will be improved.

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

  Note that the above description shows only a part of the embodiment of the present invention, and these configurations can be combined with each other or various modifications can be made without departing from the gist of the present invention. . For example, in the illustrated manufacturing process, the seismic isolation plug 6 is manufactured by compressing and deforming the pressure-receiving surface 7 of the powder material 2 into different shapes 1 to 3 times, depending on the desired air content. It is also possible to repeat the compression step. Moreover, in the manufacturing process of the illustrated example, the powder material 2 is pressure-molded by using three types of stampers 5 including a flat stamper 5a, an inclined stamper 5b, and a cone stamper 5c. It is also possible to use the stamper 5 having the above, and further press-mold by increasing the types of the stamper 5.

  Next, a seismic isolation plug (comparative seismic isolation plug) manufactured using the flat stamper described in Patent Document 1 and a seismic isolation plug manufactured using the manufacturing method of the present invention according to the place shown in FIG. Example seismic isolation plugs) were prototyped and their performance was evaluated, which will be described below.

The comparative example seismic isolation plug was manufactured by the method described below. First, a powder material made of a plastic fluid material and a hard filler having a calculated specific gravity of 5.54 g / cm ³ and having the composition shown in Table 1 was filled into a cylindrical mold having an inner diameter of 43.6 mm. Then, the powder material was manufactured by pressurizing and deforming the powder material at a surface pressure of 123.56 MPa using a flat stamper having a flat pressure surface perpendicular to the pressing direction of the stamper. In addition, the diameter of the seismic isolation plug manufactured in this way is 43.7 mm, and the height is 49.3 mm. The air content of the manufactured seismic isolation plug was calculated from the actual specific gravity of the manufactured seismic isolation plug relative to the calculated specific gravity of the powder material filled in the mold.

Moreover, the example seismic isolation plug was manufactured by the method demonstrated below. First, as shown in FIG. 1 (a), a powder material composed of a plastic fluid and a hard filler having a calculated specific gravity of 5.54 g / cm ³ and the composition shown in Table 1 has an inner diameter of 43.6 mm. In a cylindrical mold. Then, as shown in FIG. 1B, the mold material is moved in a direction opposite to the pressing direction by the stamper, and at the same time, the powder material is pressed by the planar stamper at a surface pressure of 123.56 MPa. Manufactured by deforming. In addition, the diameter of the seismic isolation plug manufactured in this way is 43.8 mm, and the height is 45.7 mm. The air content of the manufactured seismic isolation plug was calculated from the actual specific gravity of the manufactured seismic isolation plug relative to the calculated specific gravity of the powder material filled in the mold.

＊１ （天然ゴム）
未加硫、ＲＳＳ＃４
＊２ （ポリブタジエンゴム（低シス））
未加硫、旭化成製「ジエンＮＦ３５Ｒ」
＊３ カーボンブラック
ＩＳＡＦ、東海カーボン製「シースト６Ｐ」
＊４ 樹脂
日本ゼオン製「ゼオファイン」、新日本石油化学製「日石ネオポリマー１４０」、丸善石油化学製「マルカレッツＭ−８９０Ａ」、「ゼオファイン」：「日石ネオポリマー１４０」：「マルカレッツＭ−８９０Ａ」＝４０：４０：２０（質量比）
＊５ 可塑剤
ジオクチルアジペート（ＤＯＡ）
＊６ その他の配合剤
亜鉛華、ステアリン酸、老化防止剤［住友化学製「アンステージ６Ｃ」、ワックス［新日本石油製「プロトワックス１」］、亜鉛華：ステアリン酸：老化防止剤：ワックス＝４：５：３：１（質量比）

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

As a result, the actual specific gravity of the conventional seismic isolation plug was 4.733 g / cm ³ and its air content was 14.5%, whereas the actual specific gravity of the seismic isolation plug of the example was 5.072 g. / Cm ³ , and the air content was reduced to 8.4%.

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

DESCRIPTION OF SYMBOLS 1 Seismic isolation plug manufacturing apparatus 2 Powder material 3 Mold 4 Pressurization surface 4a, 4a 'Pressurization surface 4b of plane stamper 4b' Pressurization surface 4c of inclined stamper Pressurization surface 5 of conical stamper 5 Stamper 5a, 5a 'Planar stamper 5b, 5b ′ Inclined stamper 5c Conical stamper 6 Seismic isolation plug 7 Mold middle mold 8 Seismic isolation device 9 Rubber plate 10 Steel plate 11 Laminate 12, 12 ′ Pressure receiving surface 12a Projected portion A of powder material A Plastic fluidizing material B Hard filler

Claims (4)

In forming a seismic isolation plug for a seismic isolation device by performing pressure molding on a powder material filled in a mold having a middle mold forming a side wall,
The stamper for pressing the powder material is moved in the pressing direction, and at the same time, an external force is applied to the middle mold to move the middle mold in a direction opposite to the pressing direction. A method of manufacturing a seismic isolation plug, wherein pressure molding is performed so that shear stress is generated at an interface with a body material. The stamper is an inclined stamper having a flat pressing surface inclined with respect to the pressing direction, or a cone stamper having a cone-shaped pressing surface whose central portion protrudes in the pressing direction from the outer peripheral portion. The manufacturing method of the seismic isolation plug of Claim 1. In an apparatus for manufacturing a seismic isolation plug for a seismic isolation apparatus, comprising a mold having a middle mold that is filled with a powder material and forming a side wall, and a stamper that press-molds the powder material in the mold.
The seismic isolation plug manufacturing apparatus, wherein the middle mold of the mold is movable in a direction opposite to the pressurizing direction when the stamper is moved in the pressurizing direction to press the powder material. . The stamper is an inclined stamper having a flat pressing surface inclined with respect to the pressing direction, or a cone stamper having a cone-shaped pressing surface whose central portion protrudes in the pressing direction from the outer peripheral portion. The manufacturing apparatus of the seismic isolation plug of Claim 3.

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