JP2004019681A - Laminated rubber support device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize the quality of a laminated rubber by uniform vulcanization while uniformly distributing internal pressure, and prevent the occurrence of trapped air in the rubber and make stably maintainable designated performance for a long time without forming defective portions such as a dent etc. on the outer periphery of a laminated rubber body. <P>SOLUTION: A plurality of elastic rubber layers 1 and multiple numbers of rigid plates 2 are alternately laminated. Among forming molds 14 used for vulcanized forming of the laminated rubber body 3 which is coated by cylindrical weather-proofed rubber 5 on the outer periphery, a through-hole 6 having a hole portion 6a with a conical end integrally projecting a conical projection having greater diameter toward its root on the outer periphery of vulcanized laminated rubber body 3 is formed on a plurality of places setting apart in a peripheral direction of a peripheral wall portion corresponding to a center position of each elastic rubber layer 1 in an intermediate mold 13. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a laminated rubber bearing device used as a support for civil engineering structures such as seismic isolation structures of various buildings or bridges, and a method of manufacturing the same. More specifically, a plurality of elastic rubber layers and a plurality of rigid plates are alternately arranged and laminated, and a laminated rubber body in which the outer peripheral portion thereof is covered with a cylindrical weather-resistant rubber is formed in an inner space of a molding die. And a method for manufacturing the same.
[0002]
[Prior art]
This type of laminated rubber bearing device is generally manufactured as follows. That is, as shown in FIG. 7, the inner space of a molding die 14 including a pair of upper and lower dies 11 and 12 and an intermediate die 13 sandwiched and fixed between the outer peripheral portions of the pair of upper and lower dies 11 and 12. , A plurality of elastic plates 1, a plurality of rigid plates 2, which are made of thin steel plates, and a pair of upper and lower thick flanges 4, 4 are alternately stacked up and down. It is manufactured (configured) by arranging a laminated rubber body 3 coated in a shape and vulcanizing and molding.
[0003]
During the vulcanization molding as described above, a large internal pressure acts inside the mold 14, and the rubber is fluidized and vulcanized by the internal pressure. In order to uniformly and uniformly cure the rubber 3 and the coating rubber 5, it is necessary to extract the air inside the mold 14 to the outside.
[0004]
Conventionally, as shown by an arrow x in FIG. 7, a slight clearance between the inner peripheral surface of the intermediate mold 13 and the outer peripheral surface of the tubular covering rubber 5 in the laminated rubber body 3 and the upper end of the intermediate mold 13 Air is discharged to the outside of the molding die 14 through a gap between the lower end portion and the upper die 11 and the lower die 12 fitted thereto, or a part of the inner peripheral surface of the intermediate die 13. A vertical groove (not shown) is formed in the vertical direction, and air is formed through the vertical groove and the gap between the upper end and the lower end of the intermediate mold 13 and the upper mold 11 and the lower mold 12. Means for improving the flow of rubber (unvulcanized rubber) by discharging it to the outside have been employed.
[0005]
[Problems to be solved by the invention]
However, in the case of the above-described conventional air bleeding means, the internal pressure cannot be equalized due to poor air bleeding at the central portion as compared with the upper and lower end portions of the laminated rubber main body 3, and the rubber pressure at the central portion cannot be increased. Flow is bad. In particular, in the case of a laminated rubber bearing device having a large thickness, the tendency is remarkable, and the escape of air in the central portion and the accompanying rubber flow are further deteriorated, resulting in uneven curing and the formation of defective fusion spots. Not only is the quality not stable, but also air pockets are generated between the rigid plate 2 and the elastic rubber layer 1 at the center, etc., and the air pockets cause swelling on the outer peripheral surface of the laminated rubber body 3. There has been a problem that the appearance is deteriorated, or that the air accumulating portion is liable to be damaged such as a crack when a slight load is applied when the laminated rubber bearing device is actually used.
[0006]
The present invention has been made in view of the above-mentioned circumstances. In addition to uniformly dispersing the internal pressure during vulcanization molding to stabilize the quality by uniform vulcanization, no air pockets are generated, and demolding is performed. Laminated rubber bearing device capable of reliably preventing a defective portion such as a dent or the like from being formed on the outer peripheral surface of the laminated rubber body during a later process, and stably maintaining a predetermined performance over a long period of time, and manufacturing the same. It is intended to provide a way.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a laminated rubber bearing device according to the present invention has a structure in which a plurality of elastic rubber layers and a plurality of rigid plates are alternately laminated, and their outer peripheral portions are covered with a tubular weather-resistant rubber. A laminated rubber bearing device configured by vulcanizing a laminated rubber body comprising
Extruded protrusions for air release during vulcanization molding are integrally formed outward from a plurality of circumferentially spaced locations on the outer peripheral surface corresponding to the center position of the thickness of each elastic rubber layer of the laminated rubber body Each of the protrusions for air release is formed in a conical shape whose diameter gradually increases toward the base thereof.
[0008]
Further, the manufacturing apparatus of the laminated rubber bearing device according to the present invention includes a plurality of elastic members in an inner space of a molding die including a pair of upper and lower molds and an intermediate mold sandwiched and fixed between outer peripheral portions of the upper and lower molds. A method for manufacturing a laminated rubber bearing device manufactured by alternately laminating a rubber layer and a plurality of rigid plates, and vulcanizing and molding a laminated rubber main body having a cylindrical weather-resistant rubber coated on an outer peripheral portion thereof. And
In the intermediate mold, through holes are formed at a plurality of positions spaced circumferentially in a peripheral wall portion corresponding to a layer thickness center position of each elastic rubber layer in the intermediate mold, and each of the through holes has an inner peripheral surface of the intermediate mold. The end hole on the side is formed in a conical shape whose diameter gradually increases toward the inside, and air is extracted to the outside through these through holes during vulcanization molding, and a part of the unvulcanized rubber is placed in the end hole of the through hole. It is characterized in that conical projections are integrally formed at a plurality of locations on the outer peripheral surface of the laminated rubber body that has been protruded and vulcanized.
[0009]
According to the present invention having the above constitutional requirements, at the time of vulcanization molding of the laminated rubber main body, the internal air in the mold storing the laminated rubber main body corresponds to the center position of the layer thickness of each elastic rubber layer. By escaping from multiple locations in the circumferential direction to the outside, the internal pressure can be evenly dispersed and uniformly vulcanized over the entire area of the laminated rubber body, stabilizing the quality and improving the rubber flow. The flow is directed outward from the central portion in the horizontal direction, so that air is not generated between the elastic rubber layer and the rigid plate in the central portion.
[0010]
In addition, the protrusions (burrs) formed at a plurality of locations on the outer peripheral surface of the laminated rubber body as air escapes have a conical shape whose diameter gradually increases toward the base thereof. When it is cut by the applied tensile force, it is cut at the tip rather than at the root of the large diameter. Here, when the protrusion for air release protrudes and is formed in a cylindrical shape, it is not known where the protrusion is torn off by the tensile force applied at the time of demolding, and a part of the outer peripheral surface of the laminated rubber body after vulcanization is formed. There is a large possibility that a defect such as a dent is generated there, and it is necessary to repair when such a dent or the like occurs, but in the case of a conical protrusion such as the present invention, Since the tip end protruding from the outer peripheral surface of the laminated rubber main body is cut off, a defect such as a dent due to gouging does not occur on the outer peripheral surface of the laminated rubber main body, and no repair is required.
[0011]
In addition, even when cutting the remaining protrusions that are not cut off at the time of demolding and trimming the outer shape, it is easy to cut and remove the thin tip part that is weak in strength among the protruding conical protrusions, leaving a large diameter root part, Cutting and shaping can be performed without damaging the outer peripheral surface of the laminated rubber main body such as a dent.
[0012]
In particular, in the method for manufacturing a laminated rubber bearing device according to the present invention described above, both ends in the axial direction of the conical end holes of the through holes formed at a plurality of locations on the peripheral wall of the intermediate mold and the inner peripheral surface of the intermediate mold. By forming the connecting portion with the inner peripheral surface of the through hole as an arc-shaped curved surface as in claim 3, a crack is formed from the connecting portion having the weakest strength in actual use in which a large load is applied. The breakage of the laminated rubber bearing device can be prevented by preventing the breakage from occurring and the damage from proceeding from there early.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a semi-longitudinal sectional view for explaining an assembled state of a molding die used in the method of manufacturing a laminated rubber bearing device according to the present invention. The molding die 14 used in such manufacturing is the same as that described in FIG. Similarly, a pair of upper and lower molds 11 and 12 and an intermediate mold 13 sandwiched and fixed between the outer peripheral portions of the pair of upper and lower molds 11 and 12 are provided. And a plurality of rigid plates 2 made of thin steel plates and a pair of upper and lower thick flanges 4 and 4 are alternately stacked up and down, and a weather-resistant rubber 5 is formed in a cylindrical shape on the outer periphery thereof. A laminated rubber bearing device is manufactured by placing the coated laminated rubber main body 3 and vulcanizing and molding.
[0014]
In the molding die 14 having the basic configuration as described above, the peripheral wall portion 13A corresponding to the center position of the thickness of the plurality of elastic rubber layers 1 constituting the laminated rubber body 3 in the intermediate mold 13 has an appropriate interval in the circumferential direction. At a plurality of separated places, through holes 6 for air release having a diameter d of about 2 to 4 mm penetrating in and out of the mold are formed. Of these through holes 6, the end hole portion 6 a on the inner peripheral surface 13 a side of the intermediate mold 13 has an opening angle θ of 120 ° that gradually increases in diameter toward the inside as clearly shown in FIG. The opening D is formed in a conical shape with a diameter D of about 10 mm. The connection between the axial ends of the conical end hole portion 6a and the inner peripheral surface 13a of the intermediate mold 13 and the inner peripheral surface of the through-hole 6 has an arc shape having a radius of curvature R of 0.5 to 1 mm. It is formed on a curved surface.
[0015]
By using the molding die 14 having the above structure and applying an internal pressure of 800 to 1000 Pa to the laminated rubber main body 3 housed and arranged in the internal space thereof and vulcanizing the same, as shown in FIGS. The square rubber laminated rubber bearing device 10 in which the protrusions 7 are integrally formed on the outer peripheral surface of the outer peripheral surface of the outer peripheral surface at positions corresponding to the through holes 6 is manufactured.
[0016]
By the way, at the time of vulcanization molding of the above-mentioned laminated rubber main body 3, the internal air of the molding die 14 is formed at a plurality of circumferential through holes 6 corresponding to the center positions of the elastic rubber layers 1. .., And smoothly escapes to the outside via the inner pressure, whereby the internal pressure is evenly distributed over the entire area of the laminated rubber main body 3 and uniform vulcanization becomes possible. The unvulcanized rubber flows outward from the horizontal center portion and swells between the elastic rubber layer 1 and the rigid plate 2 or between the elastic rubber layer 1 and the covering rubber 5 at the central portion. The air pocket which causes the appearance defect and the local damage due to is not generated.
[0017]
In addition, a part of the unvulcanized rubber flows into the conical end hole portions 6a of the through holes 6 and is hardened with the escape of the air during the vulcanization molding. A plurality of protrusions (burrs) 7 projecting from the outer peripheral surface of the laminated rubber main body 3 have a root portion 7a having a diameter D1 of about 10 mm and a tip end portion 7b as shown in FIG. It has a frustoconical shape with a diameter d1 of about 2 to 4 mm. Therefore, when the mold is removed from the mold after the molding and a tensile force is applied thereto, it is cut at the tip 7b rather than the large-diameter root 7a, so that the outer peripheral surface of the laminated rubber body 3 is cut off. There is no occurrence of a defective portion such as a dent that needs repair. Furthermore, even when the protrusions 7 that have not been cut off during the removal of the mold 7 are cut and the outer shape is adjusted, the thin protruding end portions 7b of the conical protruding protrusions 7 with weak strength are retained while leaving the strong root portions 7a. Since it is easy to cut and remove, it is possible to cut and shape the outer peripheral surface of the laminated rubber main body 3 without damaging the outer peripheral surface of the laminated rubber main body 3. ) Can be obtained.
[0018]
In the above-described embodiment, the laminated rubber bearing device 10 formed into a quadrangular prism shape has been described. However, it is needless to say that the present invention may be applied to a cylindrical laminated rubber bearing device 10 as shown in FIG.
[0019]
【The invention's effect】
As described above, according to the present invention, at the time of vulcanization molding of the laminated rubber main body, the internal air in the molding die is smoothly discharged to the outside from a plurality of locations in the circumferential direction corresponding to the center position of the thickness of each elastic rubber layer. The internal pressure can be evenly distributed over the entire area of the laminated rubber body to achieve uniform vulcanization, stabilize the quality, and improve the flow of rubber to improve the gap between the elastic rubber layer and the rigid plate. For example, it is possible to eliminate the occurrence of air pockets that cause external defects and local damage.
[0020]
Moreover, by forming a protruding projection of a conical shape having a diameter gradually increasing toward the root at a plurality of locations on the outer peripheral surface of the laminated rubber body, the material can be cut off by the tensile force applied at the time of demolding after molding. Even when cutting the remaining protrusions that have not been cut off during mold release and trimming the outer shape, it is easy to cut at the tip protruding from the outer peripheral surface of the laminated rubber main body, and the scars that have been cut off on the outer peripheral surface of the laminated rubber main body Therefore, there is an effect that a defective portion such as a dent is not generated, so that the original performance of the laminated rubber bearing device can be stably maintained over a long period of time.
[0021]
In particular, by performing vulcanization molding using the molding die formed as in claim 3, the occurrence of cracks from the connection portion that is the weakest in strength and the progression of damage due to the weakest during actual use in which a large load acts. Thus, the durability of the laminated rubber bearing device can be improved.
[Brief description of the drawings]
FIG. 1 is a semi-longitudinal sectional view illustrating an assembled state of a molding die used in a method of manufacturing a laminated rubber bearing device according to the present invention.
FIG. 2 is an enlarged vertical sectional view of a main part of the molding die.
FIG. 3 is a schematic external perspective view of a manufactured laminated rubber bearing device.
FIG. 4 is a semi-longitudinal sectional view of the laminated rubber bearing device.
FIG. 5 is an enlarged longitudinal sectional view of a main part of the laminated rubber bearing device.
FIG. 6 is a schematic external perspective view showing a modified example of the manufactured laminated rubber bearing device.
FIG. 7 is a semi-longitudinal sectional view illustrating an assembled state of a conventional molding die used in a method of manufacturing a laminated rubber bearing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Elastic rubber layer 2 Rigid plate 3 Laminated rubber main body 5 Weatherproof covering rubber 6 Through hole 6a End hole portion 7 Protrusion 7a Root 7b Tip 10 Laminated rubber bearing device 11 Upper die 12 Lower die 13 Intermediate die 14 Mold

Claims (3)

A laminated rubber bearing device formed by alternately laminating a plurality of elastic rubber layers and a plurality of rigid plates, and vulcanizing and molding a laminated rubber main body having an outer peripheral portion coated with a cylindrical weather resistant rubber. And
Extruded protrusions for air release during vulcanization molding are integrally formed outward from a plurality of circumferentially spaced locations on the outer peripheral surface corresponding to the center position of the thickness of each elastic rubber layer of the laminated rubber body Has been
The laminated rubber bearing device, wherein each of the protrusions for air release is formed in a conical shape whose diameter gradually increases toward the base thereof. A plurality of elastic rubber layers and a plurality of rigid plates are alternately laminated in an inner space of a mold including a pair of upper and lower molds and an intermediate mold sandwiched and fixed between outer peripheral portions of the upper and lower molds. A method of manufacturing a laminated rubber bearing device, which is manufactured by arranging and vulcanizing and molding a laminated rubber main body coated with a cylindrical weather-resistant rubber on the outer periphery thereof,
Through holes are formed at a plurality of locations circumferentially spaced at a peripheral wall portion corresponding to the center position of the thickness of each elastic rubber layer in the intermediate mold,
In each of these through holes, an end hole portion on the inner peripheral surface side of the intermediate mold is formed into a conical shape whose diameter gradually increases toward the inside, and air is extracted to the outside through these through holes during vulcanization molding, and unvulcanized rubber is formed. Manufacturing a laminated rubber bearing device characterized in that a part of the rubber member protrudes into the end hole portion of the through hole and conical projections are integrally formed at a plurality of locations on the outer peripheral surface of the laminated rubber body after vulcanization. Method. 3. The lamination according to claim 2, wherein the connecting portions between the axial ends of the conical end holes of the through holes and the inner peripheral surface of the intermediate mold and the inner peripheral surface of the through hole are each formed in an arcuate curved surface. Manufacturing method of rubber bearing device.

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