JP2012215213A - Method and device for manufacturing plug and the plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a plug at high efficiency of production, which is capable of performing the manufacture by preventing pressing force to powder material from being consumed by friction with a mold to efficiently apply the pressing force to the powder material, when press forming the plug using the powder material, and further capable of easily taking the formed plug from the mold.SOLUTION: When a plug for seismic isolation is formed by performing press forming of powder material 2 charged in a mold 3 via a stamper 5, coating material 10 having a friction coefficient with an inner side surface of the mold 3 smaller than that between the inner side surface of the mold and the powder material 2 is attached to the inner side surface of the mold 3, and the press forming is then performed. The coating material 10 is left on the plug 6 surface after the press forming.

Description

  The present invention relates to a method and apparatus for manufacturing a plug used in a seismic isolation structure by pressure molding of a powder material.

  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 plug is press-fitted into the hollow portion.

  As the plug, a plug made of lead as a whole is often used, and when the laminate undergoes shear deformation as an earthquake occurs, the plug absorbs vibration energy by shear deformation. However, lead has a large environmental load and a large cost for disposal. Therefore, the development of a plug having sufficient damping performance, displacement followability, etc. has been attempted even when a lead substitute material is used.

  For example, Patent Document 1 encloses a powder material in which a hollow portion of a laminate is made of a plastic fluid material and a hard filler, and a gap between the hard fillers is filled with the plastic fluid material instead of a lead plug. A seismic isolation device has been proposed. Such a plug, like a lead plug, stably ensures its damping performance and displacement follow-up even when used for a long time. 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.

JP 2006-316990 A

  Although Patent Literature 1 discloses a plug for seismic isolation in which damping characteristics and displacement followability are stably secured without using lead, in recent years, further productivity of such a plug has been disclosed. There is a need for improvement, and Patent Document 1 makes no mention of this requirement.

The plug in the seismic isolation device described in Patent Document 1 is usually formed by pressing a powder material made of a plastic fluid material and a hard filler filled in a mold at a predetermined surface pressure with a stamper. Although it is manufactured, when the stamper is put into and out of the mold and the pressure molding is performed, the powder material filled in the mold is composed of a plastic fluidized material and a hard filler. There was significant friction between them. As a result, the force applied to the powder material is wasted as a frictional force, and the applied pressure does not act efficiently on the powder material. Therefore, it is necessary to apply a large amount of force to the stamper, which hinders production efficiency. It was.
In addition, when a plug produced by pressure molding is extracted from the mold, friction is generated between the plug made of the plastic fluid material and the hard filler and the inner surface of the mold. It was difficult to extract easily.

  Accordingly, an object of the present invention is to suppress the pressure applied to the powder material from being consumed by friction with the mold when the plug is pressure-molded using the powder material. An object of the present invention is to provide a method of manufacturing a plug with high production efficiency, in which a pressure can be efficiently applied to the plug, and the molded plug can be easily taken out from the mold. In addition to providing a plug produced by such a manufacturing method, a further object of the present invention is to provide a seismic isolation structure using the plug and a manufacturing apparatus for the seismic isolation structure. It is providing the manufacturing method of a structure.

  In order to achieve the above object, the inventors reduced the frictional force generated between the powder material composed of the plastic fluid material and the hard filler and the mold, and removed the molded plug from the mold. We have eagerly studied how to reduce the frictional force with time. The inventors have found means capable of reducing the friction between the plug material and the mold not only during the pressure molding but also after the molding, and have completed the present invention.

That is, the gist configuration of the present invention is as follows.
(1) When forming a plug for seismic isolation by pressure forming the powder material filled in the mold through a stamper,
A pressure-molding is performed after a coating material having a friction coefficient between the inner surface of the mold and the powder material is smaller than the friction coefficient between the inner surface of the mold and the powder material. ,
A method for producing a plug, characterized in that the coating material is left on the surface of the plug after the pressure molding.

Here, “attaching the coating material” means that the coating material is applied partially or entirely to the inner surface of the mold, or a cylinder that fits the inner diameter of the mold cylinder, as will be described later. A state in which a plug coating material is fitted.
Further, “remaining” means a state in which the coating material is partially or entirely attached to the plug surface, or covers the entire plug surface, as will be described later.

  (2) The production of the plug according to (1), wherein a coating material having a friction coefficient with the stamper smaller than a friction coefficient between the stamper and the powder material is adhered to the surface of the stamper. Method.

  (3) The method for manufacturing the plug according to (1) above, in which the rigid plate and the elastic plate are alternately laminated, and the hollow portion of the laminate formed with a hollow portion extending through the plate in the lamination direction is formed. A method for manufacturing a seismic isolation structure, wherein the plug manufactured by the method is press-fitted.

  (4) A plug manufactured by the plug manufacturing method according to (1).

(5) A coating material having a coefficient of friction between the inner surface of the mold and the inner surface of the mold smaller than the coefficient of friction between the inner surface of the mold and the powder material is attached to the inner surface of the mold into which the powder material is inserted. Mold and
A seismic isolation device comprising a stamper on which a coating material having a friction coefficient with the stamper smaller than the friction coefficient between the stamper and the powder material is attached to the surface of a stamper that press-molds the powder material. Plug manufacturing equipment.

  According to the present invention, when a powder material which is a substitute material for lead is used and pressure-molded using a stamper, the friction between the powder material and the inner surface of a mold filling the powder material is particularly reduced. Since it can be reduced, the force to be applied to the stamper can be reduced. Therefore, it is possible to provide a method for manufacturing a plug with improved production efficiency. Moreover, the production efficiency of a seismic isolation structure can be improved by using the plug obtained by this.

(A)-(g) is the figure which showed the manufacturing process of the plug according to this invention. It is the figure which showed the plug manufactured according to this invention by using comparatively hard resin as a coating material. It is the figure which showed the plug manufactured according to this invention using comparatively soft resin as a coating material. (A) is a top view of the seismic isolation structure in which the plug manufactured according to the present invention is press-fitted, and (b) is a cross-sectional view of the seismic isolation structure. (A)-(h) is the figure which showed the stamper which has the pressurization surface of various shapes used in the manufacturing process of the plug according to this invention. (A)-(g) is the figure which showed the manufacturing process of the other plug according to this invention.

  Next, embodiments of the present invention will be described with reference to the drawings. FIGS. 1A to 1G are diagrams showing a manufacturing process of a plug according to the present invention. FIG. 2 is a diagram showing a plug manufactured according to the present invention using a relatively hard resin as a coating material. FIG. 3 is a view showing a plug manufactured according to the present invention using a relatively soft resin as a coating material. FIG. 4A is a top view of the base isolation structure into which the plug manufactured according to the present invention is press-fitted, and FIG. 4B is a cross-sectional view of the base isolation structure. FIGS. 5A to 5H are views showing stampers having various shapes of pressure surfaces used in the manufacturing process of the plug according to the present invention. 6 (a) to 6 (g) are diagrams showing another plug manufacturing process according to the present invention.

The seismic isolation structure plug manufacturing apparatus 1 according to the present embodiment includes, for example, a cylindrical mold 3 filled with a powder material 2 and powder in the mold 3 as shown in FIG. Two types of stampers 5a and 5b having pressurizing surfaces 4a and 4b for pressurizing the body material 2 are provided. A stamper 5a shown in FIGS. 1 (b) to 1 (d) is an inclined stamper 5a having a weight-shaped pressing surface 4a whose central portion protrudes in the pressing direction from the outer peripheral portion. Further, another stamper 5b shown in FIGS. 1E to 1F is a flat stamper 5b having a flat pressing surface 4b orthogonal to the pressing direction. Using such a manufacturing apparatus, as shown in the manufacturing steps of FIGS. 1A to 1F, a powder material 2 made of a plastic fluid material and a hard filler filled in a mold 3 is applied to an inclined stamper 5a. And the plug 6 for seismic isolation structures is shape | molded by pressurizing sequentially by the plane stamper 5b.
The details of the manufacturing process of the plug 6 will be described below.

  First, as shown in FIG. 1A, a coating material 10 is attached to the inner surface of the mold 3. In this coating material 10, the friction coefficient with the inner surface of the mold 3 is smaller than the friction coefficient between the powder material 2 filled in the mold 3 and the inner surface of the mold 3. It functions as a lubricant by interposing between the inner surface of the mold 3. Thereafter, as shown in FIG. 1 (b), the powder material 2 as the material of the plug 6 is filled in the mold 3. Next, as shown in FIG. 1 (c), the inclined stamper 5a is moved in the direction of the arrow, and the powder material 2 is pressure-molded by the weight-shaped pressure surface 4a with the coating material 10 interposed therebetween. The shape of the pressure-receiving surface 7 of the body material 2 is deformed into a weight shape that is depressed at the center portion as compared with the peripheral portion on the mold side. Next, as shown in FIG. 1D, after being lifted in a direction opposite to the pressurizing direction of the inclined stamper 5a, the inclined stamper 5a is orthogonal to the pressing direction as shown in FIG. It replaces with a flat stamper 5b having a flat pressing surface 4b. Next, as shown in FIG. 1 (f), the planar stamper 5b is moved in the direction of the arrow, and the pressure-receiving surface 7 of the powder material 2 is pressure-molded by the pressing surface 4b of the planar stamper 5b. The shape of the pressure receiving surface 7 of the material 2 is made flat.

The powder material 2 filled in the mold 3 is composed of a plastic fluid material and a hard filler. Examples of substances contained in the plastic fluid material include (natural rubber, polybutadiene rubber, acrylic rubber, silicon rubber, polyurethane, urethane). Elastomer components (such as elastomers), resin (such as rosin resin, phenolic resin), carbon black, plasticizer (such as phthalic acid, maleic acid, citric acid), softening (such as castor oil, linseed oil, rapeseed oil) Materials and the like. In addition, the substances contained in the hard filler include metal powders and metal compounds such as copper powder, stainless steel powder, zirconium powder, tungsten powder, bronze powder, aluminum powder, nickel powder, molybdenum powder, titanium powder, and iron powder. Is mentioned.
By using the above powder material as an alternative material for lead, it is possible to solve the problem of environmental load and to provide a seismic isolation plug having sufficient damping performance, displacement followability, and the like.
Note that the composition, content, combination, and the like of the materials selected for each of the plastic fluid material and the hard filler can be appropriately changed according to the performance desired for the seismic isolation plug. In addition, the powder material is not limited to the configuration made of the plastic fluid material and the hard filler, and various other powder materials can be applied.

Here, as described with reference to FIG. 1, in order to pressurize and compressively deform the powder material 2, the inclined stamper 5 a and the flat stamper 5 b need to be taken in and out of the cylinder of the mold 3. At this time, a large friction is generated between the powder material 2 filled in the cylinder and the wall surface in the cylinder. Each time force is applied to the powder material by the stamper, the powder material is caused to flow in the cylinder of the mold, and this flow causes friction between the powder material and the wall surface in the cylinder. This is because. Therefore, even if a desired force to be applied to the powder material is applied to the stamper, a part thereof is wasted as a frictional force, and it is necessary to apply a large force to the stamper unnecessarily.
From this, the present inventors efficiently applied the applied pressure consumed by the friction to the powder material by reducing the friction force generated between the powder material and the inner surface of the mold. It has been found that the efficiency of plug production can be improved, and that the molded plug can be easily removed from the mold.

Therefore, in the present invention, as a means for reducing the frictional force generated between the powder material and the inner surface of the mold, when the powder material is pressure-molded by a stamper, Plug after pressure molding is performed by pressing the powder material with a coating material having a friction coefficient with the inner surface of the mold smaller than the friction coefficient between the powder material and the inner surface of the mold. The above-described plug manufacturing method in which the coating material remains on the surface was employed.
As a result, the inner surface of the mold is in a state in which the coating material is attached. Therefore, the powder material in the mold pressed by the stamper is mainly near the wall surface in the mold cylinder. Friction is generated between the coating material and the wall surface in the cylinder of the mold. As described above, since the friction coefficient between the coating material and the inner surface of the mold is smaller than the friction coefficient between the powder material and the inner surface of the mold, the coating material is disposed between the coating material and the wall surface in the cylinder of the mold. The friction generated in is smaller than the friction generated between the powder material and the wall surface in the cylinder of the mold. In this way, by interposing the coating material between the powder material and the inner surface of the mold, it is possible to reduce the frictional force generated between them, thereby avoiding the use of unnecessary pressure. Thus, a desired force can be directly applied to the powder material.
Then, when the pressure molding of the powder material is started under the intervention of the coating material in this way, the coating material is gradually taken into the powder material side as the powder material flows, Since it remains on the outer peripheral surface of the flowing powder material, the pressure-molded state under the low friction is maintained. Furthermore, since the coating material remains on the outer peripheral surface of the plug after pressure molding, the plug is manufactured as if it were covered with the coating material. Therefore, it is possible to easily remove the molded plug from the mold.

As the coating material 10, for example, a resin such as polytetrafluoroethylene (PTFE), FEP, PFA, or PEEK, or a rubber-based material such as silicon is used.
-As a relatively hard resin having a JIS hardness of 50 ° to 100 °, solid PTFE and PEEK are preferably used.
JIS hardness 5 ° to 25 ° As a relatively soft resin, gel-like or liquid silicon, PTFE, FEP, PFA paint are preferably used, but are not necessarily limited to these. Other materials can be used as long as the friction coefficient with the side surface is smaller than the friction coefficient between the powder material and the inner side surface of the mold.

  Moreover, as a method of attaching a coating material to the inner surface of the mold, for example, there is a method of applying a resin by brushing or the like. Further, when the coating material is a relatively hard resin, for example, there is a method of fitting a cylindrical coating material so that the coating material matches the cylinder of the mold.

  2 and 3 show an example of a plug for seismic isolation manufactured using the above-described plug manufacturing method and materials.

The plug shown in FIG. 2 is applied after the coating material 10 is attached to the inner surface of the mold 3 by fitting the cylindrical coating material 10 made of hard resin into the wall surface of the cylindrical mold 3. It is a plug subjected to pressure forming. As described above, when the powder material 2 is pressure-molded by the inclined stamper 5a or the flat stamper 5b, the powder material 2 in the cylinder of the mold 3 flows and is pressed by the stampers 5a and 5b. As the internal pressure rises, the cylindrical coating material 10 is pressed against the inner surface of the mold 3. Further, since the powder material 2 in the cylinder of the mold 3 flows, the flowing powder material 2 and the coating material made of a relatively hard resin come into contact with each other, so that the coating material is somewhat separated from the powder material. Will be mixed.
Thereafter, the pressed plug is taken out by, for example, destroying the cylindrical coating material 10 at the time of releasing from the mold 3. In this case, the outer peripheral surface of the manufactured plug is in a state in which the coating material partially remains and adheres as shown in FIG. Since the cylindrical coating material 10 is destroyed, it cannot be reused. In addition, the pressed plug has, for example, a shape in which the cylindrical coating material 10 can be divided, and can be taken out by removing the coating material 10 after being removed from the mold 3. . In this case, the outer peripheral surface of the manufactured plug is in a state in which the coating material partially remains and adheres as shown in FIG. The separable cylindrical coating material 10 can be reused. Furthermore, the pressed plug can be taken out with the cylindrical coating material 10 attached to the outer peripheral surface, and can be inserted into the laminated rubber as it is. In this case, the outer peripheral surface of the manufactured plug is in a state where the coating material is attached to the whole.

  On the other hand, the plug shown in FIG. 3 was subjected to pressure molding after a coating material was attached to the inner surface of the mold 3 by applying soft resin to the wall surface in the cylindrical mold by brushing or the like. It is a plug. Similarly to the above, when the powder material 2 is pressure-formed by the inclined stamper 5a or the flat stamper 5b, the powder material 2 in the cylinder of the mold 3 flows. The coating material made of a relatively soft resin is mixed with the powder material 2. As a result, as shown in FIG. 3, the manufactured plug has the entire outer peripheral surface covered with a coating material, and the coating material is mixed with the powder material. The powder material located in the position of the coating material has a higher mixing ratio of the coating material, and the powder material separated from the wall surface has a lower mixing ratio of the coating material.

Furthermore, it is preferable that the coating material serving as the sliding material is adhered not only to the inner surface of the mold but also to the stamper surface. In this case, a coating material whose friction coefficient with the powder material is smaller than the friction coefficient between the stamper and the powder material is attached to the stamper. In practice, it is preferable to use the same coating material as the previous coating material for molding stabilization, but other materials may be used.
As described above, for the pressure molding of the plug, it is necessary to pressurize the powder material filled in the mold cylinder by inserting and inserting the stamper into the mold cylinder. Since the stamper and the powder material flowing in the cylinder are in contact with each other, a large friction is generated between the stamper and the powder material. For this reason, in order to apply a desired pressing force to the powder material, it is necessary to further apply a force against the friction generated between the stamper and the powder material to the stamper. Therefore, if the coating material is interposed between the stamper and the powder material to reduce the friction generated between the two, the force to be applied to the stamper can be reduced as a result. Production efficiency can be further improved.

  Next, a method for manufacturing a seismic isolation structure using a plug manufactured by the plug manufacturing method according to the present invention will be described.

First, the plug 6 obtained as described above is extracted from the plug manufacturing apparatus 1 as shown in FIG.
Here, as described above, the outer peripheral surface of the plug manufactured by the plug manufacturing method according to the present invention is in a state where a coating material having a small friction coefficient with the inner surface of the mold is partially or entirely attached. Therefore, when the completed plug is extracted from the inside of the cylinder of the mold, the coating material becomes a sliding material, and smooth extraction can be realized.

  FIG. 4 shows the seismic isolation structure 20 after the plug according to the present embodiment has been press-fitted, wherein (a) is a top view of the seismic isolation structure, and (b) is a cross-sectional view of the seismic isolation structure. Is shown. As shown in FIG. 2 (b), the seismic isolation structure is formed by laminating substantially doughnut-shaped rigid plates 12 and substantially donut-shaped elastic plates 13 alternately in the laminating direction (vertical direction). The laminated body 14 which has the cylindrical hollow part extended in the center part is provided.

The rigid plate 12 and the elastic plate 13 constituting the laminated body 14 are firmly bonded by, for example, vulcanization adhesion or an adhesive. In the vulcanization adhesion, the rigid plate 12 and the unvulcanized rubber composition are laminated and then vulcanized, and the vulcanized product of the unvulcanized rubber composition becomes the elastic plate 13. Here, as the rigid plate 12, a metal plate such as a steel plate, a ceramic plate, a reinforced plastic plate such as FRP, or the like can be used. On the other hand, as the elastic plate 3, a vulcanized rubber plate or the like can be used.
Moreover, the laminated body 14 which comprises the seismic isolation structure of this invention has the outer peripheral surface covered with the laminated body coating | covering material, interrupts the rain and light from the exterior to the laminated body 14, oxygen, ozone, Deterioration of the laminate 14 due to ultraviolet rays can be prevented. As the covering material, for example, vulcanized rubber, which is the same material as the elastic plate 13, can be used. In addition, the laminated body 14 does not necessarily need to be covered with the laminated body covering material.
When the laminated body 14 receives a shearing force in the horizontal direction due to the vibration, the laminated body 14 is shear-deformed and absorbs the energy of the vibration. Moreover, since the laminated body 14 has the rigid board 12 and the elastic board 13 laminated | stacked alternately, even when a load acts on the lamination direction, compression is suppressed.

In this embodiment, the plug 6 manufactured by the plug manufacturing method according to the present invention is press-fitted into the hollow portion of the laminate 14.
At this time, as described above, the outer peripheral surface of the plug manufactured by the plug manufacturing method according to the present invention is in a state where a coating material having a small friction coefficient with the inner surface of the mold is partially or entirely attached. Therefore, when press-fitting a plug into a hollow portion where a rigid plate such as a metal is laminated, this coating material becomes a sliding material, compared to the case of plug-fitting produced by a method not using a conventional coating material, Smooth press-fitting can be realized. Specifically, the friction coefficient of the plug using no coating material for the hollow portion of the laminate is 0.5 to 0.75, whereas the friction coefficient of the plug using the coating material for the hollow portion of the laminate is 0.5 to 0.75. Becomes 0.03 to 0.5.

  Next, after the plug 6 is press-fitted into the hollow portion of the laminated body 14, the substantially donut-shaped flange plates are fixed to both end surfaces (upper and lower ends) of the laminated body 14 in the stacking direction. Is completed.

  In the example shown in FIG. 1, the inclined stamper 5a and the flat stamper 5b are used as the stamper. However, it is not always necessary to have these shapes. The shape is not particularly limited as long as the shape can promote the flow of 2. For example, as shown in FIG. 5 (a), the pressure surface 4 has a shape that gradually decreases in diameter toward the tip, or as shown in FIG. 5 (b), the outer peripheral portion of the pressure surface 4 is the center. Or a shape in which the pressing surface 4 is inclined with respect to the pressing direction as shown in FIG. 5C, or a pressing surface as shown in FIG. 5D. 4 has a shape that is partially inclined with respect to the pressurizing direction, or has a stepped shape in which the diameter of the pressurizing surface 4 is gradually reduced toward the tip, as shown in FIG. As shown in FIG. 5 (f), the pressure surface 4 has a plurality of needle-like protrusions, or as shown in FIG. 5 (g), the pressure surface 4 has a shape that is rotated a plurality of times in the pressure direction. Alternatively, as shown in FIG. 5 (h), the pressing surface 4 can be formed in a hemispherical shape.

In addition, as a secondary effect, when the inclined stamper 5a as shown in FIG. 1 is used, the amount of change around the pressure receiving surface 7a is particularly large in the pressurizing step of FIG. The flow of the powder material 2 on the wall surface of the mold 3 is strongly promoted. That is, the frictional force generated between the powder material and the inner surface of the mold is larger than the frictional force generated when pressing is performed with a stamper having a flat pressing surface orthogonal to the pressing direction. Therefore, in such a case, the use of the plug manufacturing method of the present invention in which a plug coating material serving as a sliding material is provided between the powder material and the inner surface of the mold can reduce the generation of frictional force particularly effectively. be able to.
In general, it is effective to reduce the air content in the plug in order to improve the damping performance and displacement followability of the seismic isolation plug. However, when the powder material includes a plastic fluid material having viscosity such as rubber, the fluidity of the powder material is lowered, and the air in the powder material is difficult to escape. When the powder material is pressed at a predetermined surface pressure with a stamper having a flat pressing surface perpendicular to the pressing direction and the seismic isolation plug is formed, the powder is separated from the pressure receiving surface. In some cases, the compressive force applied to the material decreases and the air content of the powder material increases as the distance from the pressure receiving surface increases. Therefore, if the powder material is pressurized using the inclined stamper 5a as shown in FIG. 1, the flow of the powder material can be promoted. It is possible to obtain a plug with a low air content as a close-packed arrangement in which the residual air hardly remains.

  Moreover, in the manufacturing process of FIGS. 1 (a) to (g), the powder material is pressurized only from one direction of the cylinder of the mold, but as shown in the manufacturing process of FIGS. 6 (a) to (g). Using a pair of opposing stampers (in the illustrated example, a combination of inclined stampers 5a and 5a ′ and a combination of flat stampers 5b and 5b ′), the powder material 2 is pressed from two directions so as to sandwich it. May be. Since pressurization from a plurality of directions can efficiently apply pressure to the powder material rather than pressurization from one direction, the productivity of the plug can be further improved.

  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. .

  Next, as shown in FIGS. 1B to 1F, a plug manufactured by filling a powder material without applying a coating material to the inner surface of the mold and press-molding with a stamper (comparison) Example plug), a plug manufactured using a hard resin as a plug coating material (Example plug 1), a plug manufactured using a soft resin as a plug coating material (Example plug 2), and an example plug 1 When manufacturing the plug (Example plug 3) and Example plug 2 manufactured with the stamper coating material applied to the stamper for pressing the powder material, the stamper for pressing the powder material is used. On the other hand, plugs (Example Plug 4) manufactured with the stamper coating material attached were respectively prototyped. These will be described below.

<Comparative plug>
The comparative plug was manufactured by the method described below.
First, a powder material made of a plastic fluid and a hard filler having a calculated specific gravity of 5.536 and having the composition shown in Table 1 is filled into a cylindrical mold having an inner diameter of 43.6 mm. Next, as shown in FIG. 6, the powder material is an inclined stamper having a cone-shaped pressure surface inclined at 60 ° with respect to the axis of the stamper, and a pair of opposed inclined stampers is used. Then, the powder material is put together by a pair of stampers and sandwiched with a surface pressure of 88.2 MPa, and is deformed under pressure. Next, the inclined stamper is replaced with a flat stamper having a flat pressing surface orthogonal to the pressing direction, and the powder material is pressed using the flat stamper to flatten the pressure receiving surface of the powder material. Manufactured with. In addition, the diameter of the seismic isolation plug manufactured in this way is 43.6 mm, and the height is 56.7 mm. The air content of the manufactured seismic isolation plug was calculated from the actual specific gravity of the manufactured seismic isolation plug relative to the calculated specific gravity of the powder material filled in the mold.

<Example plug 1>
Example plug 1 was manufactured by the method described below.
First, a cylindrical plug coating material that fits the cylinder of the mold 3 is fitted into the wall surface of the cylindrical mold having an inner diameter of 47.6 mm, so that the inner surface of the mold 3 is fitted. Attach plug coating material. The plug coating material is PTFE (hard resin).
Next, a powder material composed of a plastic fluid and a hard filler having a calculated specific gravity of 5.536 and having the composition shown in Table 1 is filled into the mold.
Next, as shown in FIG. 6, the powder material is an inclined stamper having a cone-shaped pressure surface inclined at 60 ° with respect to the axis of the stamper, and a pair of opposed inclined stampers is used. Then, such a powder material is put together by a pair of stampers and sandwiched at a surface pressure of 50 MPa, and is deformed under pressure. Next, the inclined stamper is replaced with a flat stamper having a flat pressing surface orthogonal to the pressing direction, and the powder material is pressed using the flat stamper to flatten the pressure receiving surface of the powder material. Manufactured with. After pressurizing with a stamper, the plug was removed from the mold, and the cylindrical coating material adhering to the outer peripheral surface was broken and removed. In addition, the diameter of the seismic isolation plug manufactured in this way is 43.6 mm, and the height is 56.7 mm. The air content of the manufactured seismic isolation plug was calculated from the actual specific gravity of the manufactured seismic isolation plug relative to the calculated specific gravity of the powder material filled in the mold.

<Example plug 2>
Example plug 2 was manufactured by the method described below.
First, silicon (soft resin) is applied as a plug coating material by brushing or the like to a wall surface in a cylindrical mold having an inner diameter of 43.8 mm.
Next, a powder material composed of a plastic fluid and a hard filler having a calculated specific gravity of 5.536 and having the composition shown in Table 1 is filled into the mold.
Next, as shown in FIG. 6, the powder material is an inclined stamper having a cone-shaped pressure surface inclined at 60 ° with respect to the axis of the stamper, and a pair of opposed inclined stampers is used. Then, such a powder material is put together by a pair of stampers and sandwiched at a surface pressure of 50 MPa, and is deformed under pressure. Next, the inclined stamper is replaced with a flat stamper having a flat pressing surface orthogonal to the pressing direction, and the powder material is pressed using the flat stamper to flatten the pressure receiving surface of the powder material. Manufactured with. After pressurizing with a stamper, the plug was pulled out from the mold and taken out, and the coating material adhering to the outer peripheral surface was scraped off. In addition, the diameter of the seismic isolation plug manufactured in this way is 43.6 mm, and the height is 56.7 mm. The air content of the manufactured seismic isolation plug was calculated from the actual specific gravity of the manufactured seismic isolation plug relative to the calculated specific gravity of the powder material filled in the mold.

<Example plug 3>
Example plug 3 was manufactured by the method described below.
First, a cylindrical plug coating material that fits the cylinder of the mold 3 is fitted into the wall surface of the cylindrical mold having an inner diameter of 43.8 mm, so that the inner surface of the mold 3 is fitted. Attach plug coating material. The plug coating material is PTFE (hard resin).
PTFE is applied as a coating material to the surface of the stamper for pressurizing the powder material.
Next, a powder material composed of a plastic fluid and a hard filler having a calculated specific gravity of 5.536 and having the composition shown in Table 1 is filled into the mold.
Next, as shown in FIG. 6, the powder material is an inclined stamper having a cone-shaped pressure surface inclined at 60 ° with respect to the axis of the stamper, and a pair of opposed inclined stampers is used. Then, such a powder material is put together by a pair of stampers and sandwiched at a surface pressure of 50 MPa, and is deformed under pressure. Next, the inclined stamper is replaced with a flat stamper having a flat pressing surface orthogonal to the pressing direction, and the powder material is pressed using the flat stamper to flatten the pressure receiving surface of the powder material. Manufactured with. In addition, the diameter of the seismic isolation plug manufactured in this way is 43.8 mm (a state in which all the resin adheres to the outer peripheral surface of the plug), and the height is 56.7 mm. The air content of the manufactured seismic isolation plug was calculated from the actual specific gravity of the manufactured seismic isolation plug relative to the calculated specific gravity of the powder material filled in the mold.

<Example plug 4>
The example plug 4 was manufactured by the method described below.
First, silicon (soft resin) is applied as a plug coating material by brushing or the like to a wall surface in a cylindrical mold having an inner diameter of 43.8 mm. Next, a powder material composed of a plastic fluid and a hard filler having a calculated specific gravity of 5.536 and having the composition shown in Table 1 is filled into a cylindrical mold.
Silicon is applied as a coating material to the surface of the stamper for pressing the powder material.
Next, a powder material composed of a plastic fluid and a hard filler having a calculated specific gravity of 5.536 and having the composition shown in Table 1 is filled into the mold.
Next, as shown in FIG. 1, the powder material is an inclined stamper having a cone-shaped pressure surface inclined at 60 ° with respect to the axis of the stamper, and a pair of opposed inclined stampers is used. Then, such a powder material is put together by a pair of stampers and sandwiched at a surface pressure of 50 MPa, and is deformed under pressure. Next, the inclined stamper is replaced with a flat stamper having a flat pressing surface orthogonal to the pressing direction, and the powder material is pressed using the flat stamper to flatten the pressure receiving surface of the powder material. Manufactured with. In addition, the diameter of the seismic isolation plug manufactured in this way is 43.6 mm (coating material is scraped off), and the height is 56.7 mm. The air content of the manufactured seismic isolation plug was calculated from the actual specific gravity of the manufactured seismic isolation plug relative to the calculated specific gravity of the powder material filled in the mold.

* 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 of manufacturing the plug as described above, it has been found that when a plug is manufactured using a plug coating material, the force applied to the stamper at the time of forming the plug can be reduced. Furthermore, when manufactured using not only the plug coating material but also the stamper coating material, the plug could be formed more easily.

  In addition, when a plug manufactured by the plug manufacturing method according to the present invention is used, the completed plug can be extracted from the inside of the cylinder of the mold with a smaller force than when the plug of the comparative example is extracted. It was.

  Furthermore, when using a plug manufactured by the method for manufacturing a plug according to the present invention, the rigid plate and the elastic plate are alternately stacked, and when press-fitting into the hollow portion extending in the stacking direction through these plates, As compared with the case of extracting the plug of the comparative example, it was possible to press-fit with a small pressing force.

DESCRIPTION OF SYMBOLS 1 Plug manufacturing apparatus 2 Powder material 3 Mold 4 Pressure surface 5 Stamper 6 Plug 10 Coating material 12 Rigid plate 13 Elastic plate 14 Laminate body 20 Seismic isolation structure

Claims (5)

When forming a plug for seismic isolation by performing pressure molding on the powder material filled in the mold through a stamper,
A pressure-molding is performed after a coating material having a friction coefficient between the inner surface of the mold and the powder material is smaller than the friction coefficient between the inner surface of the mold and the powder material. ,
A method for producing a plug, characterized in that the coating material is left on the surface of the plug after the pressure molding. The plug manufacturing method according to claim 1, wherein a coating material having a friction coefficient with the stamper smaller than a friction coefficient between the stamper and the powder material is adhered to the surface of the stamper.   A rigid plate and an elastic plate are alternately laminated, and the hollow portion of the laminated body in which a hollow portion extending through the plate in the laminating direction is formed is manufactured by the plug manufacturing method according to claim 1. A method for manufacturing a base-isolated structure, characterized by press-fitting a plug.   A plug manufactured by the method for manufacturing a plug according to claim 1. A mold in which a coating material having a friction coefficient between the inner surface of the mold and the inner surface of the mold is smaller than the friction coefficient between the inner surface of the mold and the powder material is attached to the inner surface of the mold into which the powder material is inserted. When,
A seismic isolation device comprising a stamper on which a coating material having a friction coefficient with the stamper smaller than the friction coefficient between the stamper and the powder material is attached to the surface of a stamper that press-molds the powder material. Plug manufacturing equipment.

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