JP2014004740A - Method for manufacturing base isolation plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a base isolation plug which can efficiently manufacture a base isolation plug having a low air content.SOLUTION: A method for manufacturing a base isolation plug includes: a first pressure step of pressurizing at least one side of a powder material filled into a mold by a non-perfect rotational symmetric pusher having a non-perfect rotational symmetric pressure surface; a first re-pressure step of pressurizing the powder material, pressurized in the first pressure step, once or more with the non-perfect rotational symmetric pusher without rotating the non-perfect rotational symmetric pusher and the mold; a second pressure step of pressurizing the powder material, pressurized in the first re-pressure step, with the non-perfect rotational symmetric pusher rotated relative to the mold to change a shape of a pressure receiving surface on the side pressurized with the non-perfect rotational symmetric pusher to a shape different from a shape after the first re-pressure step; and a second re-pressure step of pressurizing the powder material, pressurized in the second pressure step, once or more with the non-perfect rotational symmetric pusher without rotating the non-perfect rotational symmetric pusher and the mold.

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.

  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, the powder material put into the mold is applied multiple times with a pusher so that the shape of the pressure receiving surface of the powder material changes to a different shape each time the powder material is pressed. A method of manufacturing a seismic isolation plug by pressing has been proposed (see, for example, Patent Document 2). Specifically, it is a method for producing a seismic isolation plug by pressurizing a powder material a plurality of times using a slanted cylindrical pusher having a pressurizing surface composed of a plane inclined with respect to the pressurizing direction. By rotating the oblique cylindrical pusher by 180 ° around the central axis during the pressure, the seismic isolation plug is designed to change the shape of the pressure receiving surface of the powder material to a different shape each time the powder material is pressurized. The manufacturing method of this is proposed. The “obliquely cut cylinder” is a shape obtained by cutting a cylinder obliquely with respect to the axial direction.
And according to the manufacturing method of this seismic isolation plug, the oblique cylindrical pusher is rotated 180 ° between each pressurization, so that the shape of the pressure receiving surface of the powder material changes to a different shape. The flow of the powder material is promoted in the mold, and the air in the powder material is released, so that a seismic isolation plug having a low air content can be obtained.

JP 2006-316990 A JP 2010-221679 A

However, the pusher has a large mass, and the operation of rotating the pusher is complicated and requires time. Therefore, in the conventional method of manufacturing a seismic isolation plug that rotates the pusher between each pressurization and changes the shape of the pressure-receiving surface of the powder material each time the pressurization is performed, the seismic isolation plug having a desired air content is used. It took a long time to obtain the above, and there was a problem that the seismic isolation plug could not be manufactured efficiently.
It is possible to change the shape of the pressure-receiving surface of the powder material each time pressure is applied by rotating the mold instead of the pusher without rotating the pusher. However, even if the mold is rotated, the seismic isolation plug cannot be efficiently manufactured.

  Then, an object of this invention is to provide the manufacturing method of the seismic isolation plug which can manufacture efficiently the seismic isolation plug with a low air content rate.

  The present inventor has intensively studied for the purpose of efficiently producing a seismic isolation plug having a low air content with a small number of pusher rotations (or mold rotations). The inventor then pressurizes the powder material in the mold using the pusher, and then rotates the pusher (or mold) and pressurizes the powder material again before pressing the powder material in the mold again. By repressurizing the powder material with a mold, a seismic isolation plug having an air content equivalent to that of a seismic isolation plug manufactured by a method of rotating a pusher or a mold each time pressure is applied is less than that of the method. The present invention has been completed by finding that it can be efficiently produced by the number of rotations (or the number of mold rotations).

  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 press molding with a pressure surface that is non-completely rotationally symmetric with respect to the pusher center axis on at least one side of the powder material filled in the mold A first pressurizing step of pressurizing using a non-complete rotationally symmetric pusher, and a side of the powder material pressed in the first pressurizing step that is pressed using the non-completely rotationally symmetric pusher. The first re-pressurization step of pressurizing at least once using the non-complete rotation symmetric pusher and the first re-pressurization step without rotating the non-complete rotation symmetric pusher and the mold. Of the non-fully rotationally symmetric powder The pressure side is pressed with the incomplete rotationally symmetric pusher rotated relative to the mold, and the powder material is applied with the incompletely rotationally symmetric pusher. A second pressure step for changing the shape of the pressure-receiving surface on the pressed side to a shape different from the shape after the first re-pressurization step; and the powder material pressed in the second pressure step The second pressure is applied to the side pressurized using the non-perfect rotational symmetry pusher one or more times using the non-perfect rotational symmetry pusher without rotating the non-perfect rotational symmetry pusher and the mold. And a pressurizing step. In this way, if the shape of the pressure-receiving surface of the powder material is changed to a shape different from the shape after the first re-pressurization step in the second pressurization step using the non-complete rotationally symmetric pusher, Thus, the powder material can be forced to flow and air mixed in the powder material can be removed to manufacture a seismic isolation plug having a low air content. In addition, when the seismic isolation plug is manufactured while changing the shape of the pressure receiving surface by rotating the incomplete rotationally symmetric pusher relative to the mold to pressurize the powder material in the second pressurizing step, By providing a pressurization step and a second repressurization step, a seismic isolation plug having an air content equal to that of a seismic isolation plug manufactured by a method of rotating a pusher or a mold each time pressurization is obtained from the method. Can be manufactured with a small number of rotations. That is, it manufactures a seismic isolation plug having an air content equivalent to that of a seismic isolation plug manufactured by a method of rotating the pusher or the mold every pressurization while reducing the number of times the pusher is rotated relative to the mold. can do. Furthermore, the first re-pressurization step and the second re-pressurization step that are used without rotating the non-perfect rotation symmetrical pusher and the mold should be performed in a very short time compared to the operation of rotating the pusher and the mold. Can do. Therefore, according to the said manufacturing method, a seismic isolation plug with a low air content rate can be manufactured efficiently.

In the present invention, the “pusher central axis” refers to a line that passes through the center of the pusher and extends in parallel with the pressing direction. Here, the “pressing direction” refers to the direction in which the pusher advances when the powder material in the mold is pressed by the pusher.
In the present invention, “complete rotational symmetry” is different from rotational symmetry in a normal sense, and the object to be rotated (pressure surface in the present invention) is 0 to 0 with respect to a predetermined axis (in the present invention, the pusher central axis). This means that the shape before the rotation and the shape after the rotation overlap even if the rotation is performed at any angle of 360 °. In the present invention, the “incompletely rotationally symmetric pressing surface” means that the pressing surface is not completely rotationally symmetric with respect to the pusher center axis. That is, the pressure surface has a shape (non-rotationally symmetric shape) that overlaps with the shape of the pressure surface before rotation only after the pressure surface is rotated 360 ° around the pusher center axis, or the pressure surface is rotated around the pusher center axis (360 / N) ° [where n is an integer of 2 or more] indicates that the shape does not overlap with the shape of the pressure surface before rotation. Incidentally, the complete rotationally symmetric shape is not particularly limited, and examples thereof include a cylindrical shape and a conical shape.
Furthermore, in the present invention, “using the pusher and the mold without rotating” does not mean that the rotation that can inevitably occur when the pusher is inserted into and removed from the mold is excluded. It means that the pusher moved in the direction opposite to the pressurizing direction after pressing the powder material or the mold after moving the pusher is used as it is.
Further, in the present invention, “the pusher rotated relative to the mold” means at least an operation of rotating the pusher around the pusher central axis and an operation of rotating the mold around the mold central axis. By performing one, the pusher is rotated relative to the mold. The “mold center axis” refers to a line that passes through the center of the mold and extends in parallel with the direction in which the pusher is inserted and removed.

  Here, the manufacturing method of the seismic isolation plug according to the present invention is a wedge shape having, as the pressing surface, two planes intersecting at the apex located on the pressure direction side with respect to the pressure direction rearmost end as the incomplete rotationally symmetrical pusher. It is preferable to use at least one of a pusher and a wedge groove type pusher having, as pressing surfaces, two planes intersecting at the bottom side located in the direction opposite to the pressing direction rather than the foremost pressing direction. If at least one of the wedge-shaped pusher and the wedge groove-shaped pusher is used as a non-complete rotationally symmetric pusher, the powder material can be made to flow more greatly in the mold, and the air mixed in the powder material can be sufficiently removed. This is because the air content of the seismic isolation plug can be further reduced.

Moreover, it is preferable that the manufacturing method of the seismic isolation plug of this invention sets the frequency | count of pressurization in the said 1st repressurization process and the said 2nd repressurization process as 2 times or more and 5 times or less. It is because the air content rate of a seismic isolation plug can further be reduced if the frequency | count of pressurization shall be 2 times or more. In addition, when the number of pressurizations is set to 6 times or more, the effect of reducing the air content of the seismic isolation plug with the increase in the number of pressurizations decreases, while the time required for manufacturing the seismic isolation plug increases. .
In the present invention, the number of pressurizations in the first repressurization step and the number of pressurizations in the second repressurization step may be the same or different from each other.

  And the manufacturing method of the seismic isolation plug of this invention pressurizes the powder material pressurized by the said 2nd repressurization process using the plane pusher which has a plane orthogonal to a pressurization direction as a pressurization surface. A seismic isolation plug is preferred. If the powder material is pressurized using a flat pusher after the second re-pressurizing step and the seismic isolation plug is manufactured, the seismic isolation plug is efficiently manufactured by setting the number of rotations of the incomplete rotationally symmetrical pusher as one time. Because it can.

  According to the method for manufacturing a base isolation plug of the present invention, a base isolation plug having a low air content can be efficiently manufactured.

(A)-(l) 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)-(b) is a front view which shows the shape of the front-end | tip part of the modification of a non-complete rotation symmetrical pusher. It is a graph which shows the influence which the difference in the manufacturing method of a seismic isolation plug has on the time required for manufacture of a seismic isolation plug, and the air content rate of a seismic isolation plug.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, in the method for manufacturing the seismic isolation plug of the present invention, after the powder material in the mold is pressed using the pusher, before the powder material is pressed again by rotating the pusher and / or the mold. The powder material is re-pressurized with a non-rotating pusher and a mold.
And the seismic isolation plug 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 manufactured by using the manufacturing method of the present invention shows, for example, a top view in FIG. 2 (a) and a line II in FIG. 2 (a) in FIG. 2 (b). As shown in a sectional view along the line, a cylindrical plate-like hollow portion 53 extending in the stacking direction (vertical direction) is formed by alternately laminating a soft plate 51 having elasticity substantially like a donut board and a hard plate 52 having rigidity. A laminated body 54, two flanges each including a substantially donut-shaped flange plate 56 and a disk-shaped sealing plate 55 fixed to both ends (upper and lower ends) of the laminated body 54, and an outer peripheral surface of the laminated body 54 It is used by being press-fitted into a hollow portion 53 of a seismic isolation structure 50 having a rubber covering material 57 covering the surface. And the seismic isolation structure 50 formed by press-fitting the seismic isolation plug 20 in the hollow part 53 of the laminated body 54 is used, for example, attached between the ground and the structure.

  Here, an example of the production method 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 to press the powder material in the mold. Using a seismic isolation plug manufacturing apparatus including a pusher exchange mechanism for exchanging a pusher used for pressurizing a powder material and a pusher rotation mechanism for rotating the pusher about the pusher central axis, for example, as described below Can be implemented. The seismic isolation plug manufacturing apparatus may include a mold rotating mechanism that rotates the mold around the mold center axis instead of or in addition to the pusher rotating mechanism.

  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 rotation mechanism can be any mechanism as long as the pusher can be rotated about the pusher center axis. The mold rotation mechanism can be any mechanism as long as the mold can be rotated with respect to the mold center axis.

  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.

  In an example of the manufacturing method of the seismic isolation plug of this invention, according to the process shown to Fig.1 (a)-(l), the wedge type pusher 3 and the wedge groove type pusher 4 as a non-perfect rotation symmetrical pusher, and the plane pusher 5 are used. A seismic isolation plug is manufactured by pressing the powder material in the mold using a predetermined order and combination. In addition, the pressure at the time of pressure-molding powder material can be suitably set according to the performance etc. of a desired seismic isolation plug.

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

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

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

  Incidentally, in the wedge groove type pusher 4 shown in FIG. 4, the base 41 is positioned at the center of the wedge groove type pusher 4 in plan view from the viewpoint of making the shape of the wedge groove type pusher 4 correspond to the shape of the wedge shape 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.

  Here, the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 described above have a rotationally symmetric shape in which the pressing surfaces (the planes 32 a and 32 b and the planes 42 a and 42 b) are symmetric about the pusher center axis. That is, the pressure surface of the wedge-shaped pusher 3 and the pressure surface of the wedge groove-shaped pusher 4 overlap with the shape of the pressure surface before rotation only after rotating 180 ° (= (360/2) °) around the pusher central axis. is there. Therefore, the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 are non-fully rotationally symmetric pushers having pressure surfaces that are non-completely rotationally symmetric with respect to the pusher central axis.

  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)-(l), as shown to Fig.1 (a)-(h), a cylindrical metal mold | die is shown first. The powder material 2 put into the interior of 1 is pressed by being sandwiched from both sides by a pair of wedge-shaped pushers 3 and wedge groove-shaped pushers 4 opposed to each other in the pressing direction.

  Specifically, first, as shown in FIG. 1A, a wedge-shaped pusher 3 is inserted into the mold 1 from one side (upper side in FIG. 1) of the powder material 2 filled in the mold 1. At the same time, a wedge-shaped pusher 4 is inserted into the mold 1 from the other side (lower side in FIG. 1) of the powder material 2, and the wedge-shaped pusher 3 and the wedge groove facing the powder material 2 in the pressing direction. Pressure is applied by sandwiching the pusher 4 from both sides. Then, as shown in FIG. 1B, the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 are extracted from the mold 1 (first pressurizing step).

  Next, as shown in FIG. 1 (c), the wedge-shaped pusher 3, the wedge groove-shaped pusher 4, and the powder material 2 pressed in the first pressing step without rotating the mold 1 are added. The wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 opposed in the pressure direction are sandwiched from both sides and pressurized once. That is, the powder material 2 in the mold is immediately re-pressurized using the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 extracted from the mold 1 as they are. Thereafter, as shown in FIG. 1D, the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 are extracted from the mold 1 (first re-pressurizing step). In the first re-pressurization step, the operation of immediately re-pressurizing the powder material 2 using the wedge-shaped pusher 3 and the wedge-groove pusher 4 extracted from the mold 1 as it is is repeated once more. That is, in the first repressurization step, the operations shown in FIGS. 1C to 1D are repeated once or more in total.

  Thereafter, as shown in FIG. 1 (e), the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 are rotated by 90 °, for example, and the powder material 2 is moved from both sides by the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 rotated by 90 °. Press again with pinching. And as shown to FIG.1 (d)-(f), the shape of the pressure receiving surface of the powder material 2 is changed into the shape different from the shape after a 1st repressurization process. Thereafter, as shown in FIG. 1 (f), the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 are extracted from the mold 1 (second pressurizing step).

  Next, as shown in FIG. 1 (g), the wedge-shaped pusher 3, the wedge groove-shaped pusher 4, and the powder material 2 pressed in the second pressing step without rotating the mold 1 are added. The wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 opposed in the pressure direction are sandwiched from both sides and pressurized once. That is, the powder material 2 in the mold is immediately re-pressurized using the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 extracted from the mold 1 as they are. Thereafter, as shown in FIG. 1 (h), the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 are extracted from the mold 1 (second re-pressurizing step). In the second repressurization step, the operation of immediately repressurizing the powder material 2 using the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 extracted from the mold 1 as it is is repeated one or more times. That is, in the second repressurization step, the operations shown in FIGS. 1G to 1H are repeated once or more in total.

  Finally, in the manufacturing method of the seismic isolation plug of this example, as shown in FIGS. 1 (i) to 1 (l), the powder material 2 pressed using the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4, A pair of flat pushers 5 and 5 opposed to each other in the pressurizing direction are pressed from both sides. 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. Thereafter, optionally, as shown in FIGS. 1 (k) to (l), flat pushers 5 and 5 are inserted into the mold 1 from both sides of the powder material 2 to press the powder material 2 and The operation of extracting the flat pushers 5 and 5 from the mold 1 is repeated once more. Then, the seismic isolation plug 20 made of the pressure-formed powder material 2 is removed from the mold 1.

And according to the manufacturing method of the seismic isolation plug of this example, since the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 which are non-perfect rotation symmetrical pushers are used, in the second pressurizing step, the powder material 2 The shape of the pressure receiving surface can be changed to a shape different from the shape after the first repressurization step. Therefore, according to the manufacturing method of the seismic isolation plug of this example, the powder material 2 is forced to flow in the mold 1 with the shape change of the pressure receiving surface of the powder material 2 in the second pressurizing step. By removing air mixed in the powder material, a seismic isolation plug having a low air content can be manufactured.
Note that the air content in the powder material is reduced due to the strong flow of the powder material in the mold, and the air content of the seismic isolation plug is lowered. This is presumably because the fillers are densely arranged.

Here, the angle at which the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 are rotated around the central axis of the pusher in the second pressurizing step changes the extending direction of the top side 31 and the bottom side 41, and the pressure receiving surface of the powder material 2 is changed. If the shape can be changed (that is, other than an integral multiple of 180 °), an arbitrary angle can be used. However, from the viewpoint of allowing the powder material 2 to flow evenly in the mold 1, the angle at which the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4 are rotated around the pusher central axis is preferably 90 °. .
In the seismic isolation plug manufacturing method of the present invention, the mold filled with the powder material is rotated around the mold center axis without rotating the non-complete rotationally symmetric pusher (wedge shaped pusher and wedge groove shaped pusher). By rotating, the non-perfect rotationally symmetrical pusher may be rotated relative to the mold. In the seismic isolation plug manufacturing method of the present invention, both the non-completely rotationally symmetric pusher (wedge shaped pusher and wedge groove shaped pusher) and the mold filled with the powder material are rotated to the mold. The non-completely rotationally symmetric pusher may be rotated relatively.

In this example of the method for manufacturing a seismic isolation plug, the wedge-shaped pusher 3 and the wedge groove-shaped pusher are used in the first re-pressurization step after the first pressurization step and the second re-pressurization step after the second pressurization step. 4 and the powder material 2 is re-pressurized without rotating the mold 1. Therefore, compared to the case where the pusher or mold is rotated each time the pressure is applied and the shape of the pressure-receiving surface of the powder material is changed each time the powder material is pressed, the seismic isolation with a low air content is achieved with a smaller number of rotations. Plugs can be manufactured. That is, the air equivalent to the seismic isolation plug manufactured by the method of rotating the pusher or the mold each time the pressure is applied while reducing the number of times of rotating the wedge-shaped pusher 3 and the wedge-shaped pusher 4 relative to the mold 1. A seismic isolation plug having a content rate can be manufactured.
Note that the wedge-shaped pusher 3 and the wedge-groove pusher 4, and the first re-pressurization step and the second re-pressurization step that are used without rotating the mold 1 are much more difficult than the operation of rotating the pusher and the mold. In a short time. Therefore, in this example of the seismic isolation plug manufacturing method, even if the powder material is re-pressurized a plurality of times in the first re-pressurization step and the second re-pressurization step, The seismic isolation plug having the same air content as that of the seismic isolation plug manufactured by the method of rotating the mold can be efficiently manufactured in a shorter time than the method. That is, since the operation of rotating the pusher and the mold is complicated and takes time, if the number of rotations of the pusher and the mold can be reduced, the first repressurization step and the second repressurization step may be provided. Therefore, it is possible to efficiently manufacture the seismic isolation plug by shortening the manufacturing time of the seismic isolation plug.

  Here, it is not clear why the seismic isolation plug having a low air content can be manufactured with a small number of rotations by providing the first repressurization step and the second repressurization step. If the pressure step and the second repressurization step are performed, the powder material is prevented from expanding when the pusher is pulled out from the mold after the first pressurization step or the second pressurization step. It is assumed that it is possible to suppress an increase in the air content of the material. That is, according to the inventor's research, when the pusher is pulled out from the mold and the pressure applied to the powder material is removed (depressurized), the powder material expands with the depressurization, and the powder Although the air content of the material increases, it is speculated that if repressurization is performed immediately after depressurization, the expansion of the powder material can be suppressed and the increase in the air content of the powder material can be suppressed. The

  In addition, in the manufacturing method of the seismic isolation plug of the present invention, from the viewpoint of sufficiently suppressing the expansion of the powder material and obtaining the seismic isolation plug having a low air content, the first repressurization step and the second reheating step are performed. The number of pressurizations (repressurization times) in the pressurizing step is preferably 2 or more. Further, from the viewpoint of efficiently producing a seismic isolation plug having a low air content in a short time, the number of pressurizations (repressurization times) in the first repressurization step and the second repressurization step is 5 The number of times is preferably less than or equal to the number of times, and more preferably less than or equal to four times. This is because if the number of pressurizations is set to 6 or more, the effect of reducing the air content of the seismic isolation plug accompanying an increase in the number of pressurizations decreases, while the time required for manufacturing the seismic isolation plug increases.

In this example of the method for manufacturing a seismic isolation plug, the powder material 2 is sandwiched and pressed by the wedge-shaped pusher 3 and the wedge groove-shaped pusher 4, so that the powder material 2 is forced to flow in the mold 1. The air in the powder material 2 can be sufficiently extracted.
From the viewpoint of sufficiently allowing the powder material 2 to flow to the rear end side (bottom side 41 side) in the pressurization direction of the pressurization surface of the wedge groove-shaped pusher 4, the top side 31 of the wedge-shaped pusher 3 extends during pressurization. The direction and the extending direction of the bottom 41 of the wedge groove pusher 4 are preferably matched. However, in the seismic isolation plug manufacturing method of the present invention, the powder material 2 may be pressed in a state where the extending direction of the top side 31 and the extending direction of the bottom side 41 are different.
Further, from the viewpoint of sufficiently flowing the powder material 2 to the rear end side (bottom 41 side) in the pressing direction of the pressing surface of the wedge groove type pusher 4 and sufficiently extracting air from the powder material 2, the wedge groove shape is used. The crossing angle α between the two flat surfaces 42 a and 42 b of the pusher 4 is preferably larger than the crossing angle β between the two flat surfaces 32 a and 32 b of the wedge-shaped pusher 3. Furthermore, the crossing angle α is preferably an obtuse angle.

Furthermore, in the manufacturing method of the seismic isolation plug of this example, the powder material 2 is pressurized using the flat pusher 5 after the second re-pressurizing step, and the seismic isolation plug 20 is manufactured. The seismic isolation plug can be efficiently manufactured by rotating the shape pusher once.
In the method for manufacturing a seismic isolation plug according to the present invention, the number of times the powder material is pressed by the flat pusher can be set to any number, but the air content rate of the manufactured seismic isolation plug is reduced and reduced. From the viewpoint of improving the flatness of the end face of the seismic plug, the number of times of pressing the powder material with the flat pusher is preferably a plurality of times. From the viewpoint of improving the flatness of the end face of the seismic isolation plug, the number of times of pressing the powder material with the flat pusher is the number of pressurizations in the first pressurization step and the number of pressurizations in the first repressurization step. And the total of the number of pressurizations in the second pressurization step and the number of pressurizations in the second repressurization step are preferably equal.

  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 is not limited to the example mentioned above, The manufacturing method of the seismic isolation plug of this invention is suitably used. You can make changes.

  Specifically, in the seismic isolation plug manufacturing method of the present invention, it is not necessary to press the powder material from both sides with a pusher. For example, the powder material filled in a bottomed cylindrical mold with one end closed. The seismic isolation plug may be manufactured by applying pressure from one side with a non-complete rotationally symmetrical pusher.

Moreover, in the manufacturing method of the seismic isolation plug of this invention, you may use the pusher shown to Fig.5 (a), (b) as an incomplete rotation symmetrical pusher.
Here, the pusher 7 whose front view is shown in FIG. 5A is a slanted cylindrical pusher having a pressing surface 71 formed of a plane inclined with respect to the pressing direction. The oblique cylindrical pusher 7 has a shape obtained by cutting a cylinder obliquely with respect to the axial direction, and the pressurizing surface 71 of the oblique cylindrical pusher 7 rotates the pressurizing surface 360 ° around the pusher central axis. It is a shape (non-rotationally symmetric shape) that overlaps with the shape of the pressure surface before rotation for the first time.
Moreover, the pusher 8 whose front view is shown in FIG. 5B is a stepped pusher having a pressurizing surface 81 made of a flat surface protruding in a stepwise manner in the pressurizing direction. The pressure surface 81 of the stepped pusher 8 has a shape (non-rotationally symmetric shape) that overlaps with the shape of the pressure surface before rotation only after the pressure surface is rotated 360 ° around the pusher center axis.

Moreover, in the manufacturing method of the seismic isolation plug of this invention, you may insert and press a powder material with the non-perfect rotation symmetrical pusher of the same shape. Specifically, in the manufacturing method of the seismic isolation plug of the present invention, the powder material may be sandwiched and pressed by two wedge-shaped pushers without being particularly limited, or the powder may be pressed by two wedge-groove pushers. The material may be sandwiched and pressurized.
Furthermore, in the seismic isolation plug manufacturing method of the present invention, only one side of the powder material may be pressurized with a non-complete rotationally symmetrical pusher, and the other side of the powder material may be pressurized with a pusher of any shape. . When the other side of the powder material is pressurized with an arbitrary shape pusher, the arbitrary shape pusher rotates around the pusher central axis at least in the first repressurization step and the second repressurization step. Use without letting go.
Moreover, in the manufacturing method of the seismic isolation plug of this invention, after the 2nd re-pressurization process, the side pressurized using the incomplete rotation symmetrical pusher of powder material is rotated relatively with respect to a metal mold | die. Added to change the shape of the pressure-receiving surface on the pressure side using a non-complete rotationally symmetric pusher, and to the shape different from the shape before pressurization Without rotating the non-perfect rotational symmetry pusher and the mold, the side of the powder material pressurized in the additional pressure step and the side pressurized using the non-perfect rotational symmetry pusher An additional repressurization step of pressurizing at least once using a non-complete rotationally symmetric pusher may be sequentially repeated to reduce the air content of the seismic isolation plug to a desired value.
Furthermore, in the seismic isolation plug manufacturing method of the present invention, the end face of the seismic isolation plug may be flattened by using means such as cutting without using a flat pusher.

  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 according to the procedure shown in Table 2 using a powder material containing a plastic fluid material and a hard filler having the composition shown in Table 1.
Specifically, in the same procedure as the manufacturing method of the seismic isolation plug shown in FIG. 1, the first pressurizing step, the first repressurizing step, the second pressurizing step using the wedge-shaped pusher and the wedge groove-shaped pusher, A second repressurization step was performed. Thereafter, the pressed powder material was pressed twice with a flat pusher to produce a seismic isolation plug.
And about the obtained seismic isolation plug, the air content rate was calculated | required with the following method. Further, the time (cycle time) T required for manufacturing the seismic isolation plug is measured, and the cycle time ratio (T / T ₀ ) to the time (cycle time) T ₀ required for manufacturing the base isolation plug of Conventional Example 1 is calculated. Asked. The results are shown in Table 2 and FIG.

* 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} is seismic isolation plug diameter of the mean value _{d av} can be calculated using _{(A B = (d av /} 2) 2 × π), the average diameter _{d av} seismic isolation plug seismic isolation It is the average value of the seismic isolation plug diameter measured by calipers in two directions orthogonal to each other on both end surfaces (upper surface and lower surface) of the plug. Further, h _av is an average value of the height of the seismic isolation plug measured with a caliper at four locations on the outer periphery of the end face of the seismic isolation plug.

(Examples 2 to 6)
Except that the number of pressurizations in the first repressurization step, the number of pressurizations in the second repressurization step and the number of pressurizations using a flat pusher were changed as shown in Table 2, they were exempted in the same manner as in Example 1. A seismic plug was manufactured.
Then, the seismic isolation plug obtained was determined air content and cycle time ratio (T / T ₀₎ in the same manner as in Example 1. The results are shown in Table 2 and FIG.

(Examples 7 to 8)
After the second repressurization step, the additional pressurization step and the additional repressurization step are sequentially repeated twice, and the number of pressurizations in the first repressurization step, the number of pressurizations in the second repressurization step, and addition The seismic isolation plug was mounted in the same manner as in Example 1 except that the number of pressurizations in the pressurization step, the number of pressurizations in the additional repressurization step, and the number of pressurizations using a flat pusher were as shown in Table 2. Manufactured.
Then, the seismic isolation plug obtained was determined air content and cycle time ratio (T / T ₀₎ in the same manner as in Example 1. The results are shown in Table 2 and FIG.

(Conventional examples 1 and 2)
A seismic isolation plug was manufactured in a cylindrical mold having an inner diameter of 16 cm according to the procedure shown in Table 2 using a powder material containing a plastic fluid material and a hard filler having the composition shown in Table 1.
Specifically, the powder material was sandwiched from both sides with a wedge-shaped pusher and a wedge groove-shaped pusher, and pressurized several times. In addition, during each pressurization, the wedge-shaped pusher and the wedge groove-shaped pusher were rotated 90 ° around the central axis of the pusher, and the shape of the pressure-receiving surface of the powder material was changed each time the pressurization was performed (that is, re-applying No pressurization step was performed). The number of pressurizations was as shown in Table 2. Thereafter, the pressed powder material was pressed once with a flat pusher to produce a seismic isolation plug.
Then, the seismic isolation plug obtained was determined air content and cycle time ratio (T / T ₀₎ in the same manner as in Example 1. The results are shown in Table 2 and FIG.

  From Table 2 and FIG. 6, it can be seen that in the manufacturing methods of Examples 1 to 8, the seismic isolation plug having the same air content can be manufactured in a short time as compared with the manufacturing methods of Conventional Examples 1 and 2. In particular, it can be seen from Table 2 and FIG. 6 that the manufacturing methods of Examples 2 to 5 can efficiently manufacture a seismic isolation plug with a low air content while greatly reducing cycle time.

(Examples 9 to 13)
Except for changing the number of pressurizations using a flat pusher as shown in Table 3, seismic isolation plugs were produced in the same manner as in Examples 2-6.
Then, the seismic isolation plug obtained was determined air content and cycle time ratio (T / T ₀₎ in the same manner as in Example 1. The results are shown in Table 3.
Moreover, about the obtained seismic isolation plug, the end surface was observed visually and the flatness of the end surface was evaluated. The results are shown in Table 3. The evaluation results indicate that “◯” indicates that the end face has no dents or chips and that the flatness is good, and “Δ” indicates that the end faces have dents or chips but are not significant.

  From Tables 2-3, it turns out that the seismic isolation plug which has an equivalent air content rate can be manufactured in a short time by the manufacturing method of Examples 9-13 compared with the manufacturing method of the prior art examples 1-2. Moreover, it can be seen from Table 3 that the manufacturing methods of Examples 9 to 12 can efficiently manufacture a seismic isolation plug having a low air content while greatly reducing cycle time. Furthermore, from Table 3, the number of pressurizations by the flat pusher is the sum of the number of pressurizations in the first pressurization step and the number of pressurizations in the first repressurization step, and the number of pressurizations in the second pressurization step. It can be seen that the flatness of the end face is lowered when the total number of pressures and the number of pressurizations in the second repressurization step are less. In addition, the seismic isolation plugs obtained in Examples 2 to 6 had no dents or chips on the end surfaces, and had good flatness.

  According to the method for manufacturing a base isolation plug of the present invention, a base isolation plug having a low air content can be efficiently manufactured.

1 Mold 2 Powder material 3 Wedge shaped pusher 4 Wedge groove shaped pusher 5 Planar pusher 7 Obliquely cylindrical pusher 8 Stepped pusher 20 Seismic isolation plug 31 Top side 32a, 32b Plane (pressurized surface)
33a, 33b Pressure direction rearmost end 41 Base sides 42a, 42b Plane (pressure surface)
43a, 43b Pressure direction most advanced 50 Seismic isolation structure 51 Soft plate 52 Hard plate 53 Hollow portion 54 Laminated body 55 Sealing plate 56 Flange plate 57 Cover material 61 Mold 71 Pressure surface 81 Pressure surface

Claims (4)

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,
A first pressurizing step of pressurizing at least one side of the powder material filled in the mold using a non-complete rotationally symmetric pusher having a non-complete rotationally symmetric presser with respect to the pusher central axis;
Without rotating the non-perfect rotationally symmetrical pusher and the mold, the non-perfect rotationally symmetrical pusher is used to rotate the non-perfect rotationally symmetrical pusher of the powder material pressurized in the first pressurizing step. A first re-pressurizing step of pressurizing at least once using a fully rotationally symmetric pusher;
The non-perfect rotational symmetry in which the side of the powder material pressurized in the first re-pressurizing step is rotated relative to the mold on the side pressurized using the non-perfect rotational symmetry pusher. Pressure is applied using a pusher, and the shape of the pressure-receiving surface on the side pressed using the non-complete rotationally symmetric pusher of the powder material is changed to a shape different from the shape after the first re-pressurization step. A second pressurizing step;
Without rotating the non-perfect rotational symmetry pusher and the mold, the non-perfect rotational symmetry pusher is used to rotate the non-perfect rotational symmetry pusher of the powder material pressurized in the second pressurizing step. A second re-pressurizing step of pressurizing at least once using a fully rotationally symmetric pusher;
The manufacturing method of the seismic isolation plug characterized by including.   As the incomplete rotationally symmetric pusher, a wedge-shaped pusher having two planes intersecting at the apex located on the pressure direction side with respect to the pressure direction rearmost end as a pressure surface, and the pressure direction more than the foremost pressure direction 2. The method of manufacturing a seismic isolation plug according to claim 1, wherein at least one of wedge groove type pushers having, as pressure surfaces, two planes intersecting at the bottom located in the opposite direction to the base is used.   3. The method for manufacturing a seismic isolation plug according to claim 1, wherein the number of pressurizations in the first repressurization step and the second repressurization step is 2 or more and 5 or less.   The powder material pressed in the second re-pressurizing step is pressed using a plane pusher having a plane perpendicular to the pressing direction as a pressing surface to form a seismic isolation plug. The manufacturing method of the seismic isolation plug in any one of 1-3.

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