JP6718378B2 - Unit laminated rubber manufacturing apparatus and unit laminated rubber manufacturing method - Google Patents

Description

The present invention relates to a unit laminated rubber manufacturing apparatus and a unit laminated rubber manufacturing method. The present application claims priority based on Japanese Patent Application No. 2014-225292 filed in Japan on November 5, 2014, the contents of which are incorporated herein by reference.

Conventionally, a supply step of supplying unvulcanized rubber onto a metal plate held on a holding surface and a pressing surface to crush the unvulcanized rubber to the holding surface side during mold clamping to form an unvulcanized rubber layer. There is known a method for producing a unit laminated rubber having a pressing step for producing a unit laminated rubber for a seismic isolation structure in which a single unvulcanized rubber layer is provided on a single metal plate. There is.

Japanese Unexamined Patent Publication No. 2010-179524

However, in the conventional method for producing a unit laminated rubber as described above, there is room for improvement in forming the unvulcanized rubber layer with high accuracy because the outer diameter of the unvulcanized rubber layer is difficult to stabilize. ..

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a unit laminated rubber manufacturing apparatus and a unit laminated rubber manufacturing method capable of forming an unvulcanized rubber layer with high accuracy. To aim.

In order to achieve such an object, the first aspect of the present invention includes a pair of molds arranged so that they can relatively approach each other and can be separated from each other, and the pair of molds has a metal plate. A cavity is defined between the holding surface to be held and the holding surface at the time of mold clamping, and the unvulcanized rubber supplied on the metal plate is crushed toward the holding surface to form the unvulcanized rubber layer. The pressing surface to be formed is formed separately, and one unvulcanized rubber layer is arranged on one metal plate to manufacture a unit laminated rubber for a seismic isolation structure. In the device, a molding weir portion formed by abutting the outer peripheral edge of the unvulcanized rubber expanded and crushed by the pressing surface during mold clamping is erected on one of the holding surface and the pressing surface. Of the unvulcanized rubber supplied on the metal plate between the molding dam and the pressing surface, the excess exceeding the internal volume of the cavity escapes to the outside of the cavity during mold clamping. A passage is formed.

According to the first aspect, at the time of mold clamping, while the excess amount of the unvulcanized rubber that exceeds the inner volume of the cavity is projected to the outside of the cavity, the unvulcanized rubber that is crushed and expanded by the pressing surface is The outer peripheral edge is abutted against the molding weir. As a result, the outer peripheral edge of the unvulcanized rubber layer can be molded with high precision by the molding dam portion, and the unit laminated rubber having a constant thickness can be accurately formed with a simple structure.

A second aspect of the present invention is the same as the first aspect, in which the forming weir portion is disposed on the pressing surface, and the escape passage is formed in the forming weir portion, and is close to the cavity of the escape passage in the forming weir portion. In the peripheral portion of the opening, the portion facing the pressing surface is a corner portion of 90° or less in a vertical cross-sectional view along the direction of the escape passage extending from the inside of the cavity toward the outside of the molding weir. There is.

According to the second aspect, of the peripheral portion of the opening of the forming dam portion near the cavity of the escape passage, a portion (hereinafter, referred to as a corner cut portion) facing the pressing surface side is a vertical cross-sectional view of the forming dam portion. The corner is 90° or less. Due to this, in connection with the fact that the molding weir is disposed on the pressing surface, when the mold is opened, the corner cut portion causes the excess portion of the unvulcanized rubber in the escape passage and the unvulcanized portion of the cavity. It becomes possible to apply a shearing force to the connecting portion between the rubber layer and the rubber layer. As a result, this connecting portion can be easily cut naturally when the mold is opened.

In addition, in the third aspect of the present invention, in the second aspect, the flow passage cross-sectional area of the escape passage gradually increases from the inside to the outside of the cavity.

According to the third aspect, the cross-sectional area of the flow passage of the escape passage gradually increases from the inside of the cavity toward the outside. As a result, when the mold is opened, it is possible to prevent the excess amount of unvulcanized rubber located in the escape passage from being pulled back toward the cavity that was formed when the mold was clamped. As a result, when the mold is opened, it is possible to reliably and easily cut the connecting portion between the excess portion in the escape passage and the unvulcanized rubber layer in the cavity.

Further, a fourth aspect of the present invention is characterized in that, in any one of the first aspect to the fourth aspect, the molding dam hits the other of the holding surface and the pressing surface during mold clamping. There is.

According to the fourth aspect, the mold dam portion is abutted against the other of the holding surface and the pressing surface at the time of mold clamping, so that the distance between the holding surface and the pressing surface at the time of mold clamping can be easily and reliably achieved. It becomes possible to make it constant. As a result, it is possible to reliably realize that the unit laminated rubber having a constant thickness can be accurately formed with a simple structure.

Further, a fifth aspect of the present invention uses the unit laminated rubber manufacturing apparatus according to any one of the first aspect to the fourth aspect, and a mold open state is provided on a metal plate held on a holding surface. In the supply step of supplying the unvulcanized rubber, a pressing step of forming an unvulcanized rubber layer by crushing the unvulcanized rubber toward the holding surface by the pressing surface during mold clamping, and a unit laminated rubber, In the method for producing a unit laminated rubber having the step of: supplying a non-vulcanized rubber having a volume larger than the inner volume of the cavity onto the metal plate, the pressing step includes crushing by a pressing surface and expanding the unvulcanized rubber. The outer peripheral edge of the vulcanized rubber is abutted against the molding weir and molded, and the excess amount of the unvulcanized rubber that exceeds the inner volume of the cavity is allowed to enter the escape passage and protrude outside the cavity.

According to the fifth aspect, at the time of mold clamping, while the excess amount of the unvulcanized rubber that exceeds the inner volume of the cavity is squeezed out to the outside of the cavity, the pressing surface is crushed to expand the unvulcanized rubber. The outer peripheral edge is abutted against the molding weir. As a result, the outer peripheral edge of the unvulcanized rubber layer can be molded with high precision by the molding dam portion, and the unit laminated rubber having a constant thickness can be accurately formed with a simple structure.

Further, a sixth aspect of the present invention, in the fifth aspect, prior to the supplying step, the weight of the metal plate held on the holding surface is measured, and based on this measurement value, the metal plate is placed on the metal plate during the supplying step. Determine the volume of unvulcanized rubber to be supplied to.

According to the sixth aspect, prior to the supplying step, the weight of the metal plate held on the holding surface is measured, and based on the measured value, the unvulcanized rubber supplied onto the metal plate during the supplying step is measured. Determine the volume. With this, when the weight of the metal plate is heavy and the thickness thereof is thick, the supply amount of the unvulcanized rubber is reduced, while when the weight of the metal plate is light and the thickness thereof is thin, the unvulcanized rubber is It is possible to increase the supply amount. As a result, the outer peripheral edge has a high-precision unvulcanized rubber layer, and when this unvulcanized rubber layer was formed as a unit laminated rubber having a constant thickness, the inner volume of the cavity was not exceeded. It is possible to minimize the excess amount of vulcanized rubber.

According to the present invention, the outer peripheral edge of the unvulcanized rubber layer can be molded with high accuracy, and the unit laminated rubber having a constant thickness can be accurately formed with a simple structure.

FIG. 3 is a vertical cross-sectional view showing the main part of the unit laminated rubber manufacturing apparatus according to the embodiment of the present invention, showing a state in which unvulcanized rubber is supplied onto a metal plate in a mold open state. It is a longitudinal cross-sectional view showing a main part of a unit laminated rubber manufacturing apparatus according to an embodiment of the present invention, showing a state in which an unvulcanized rubber layer is formed in a mold clamped state. It is a longitudinal cross-sectional view showing a main part of a unit laminated rubber manufacturing apparatus according to an embodiment of the present invention, showing a state in which a mold is opened after forming an unvulcanized rubber layer. FIG. 3 is a sectional view taken along the line AA shown in FIG. 2. It is a longitudinal cross-sectional view showing a main part of a unit laminated rubber manufacturing apparatus according to an embodiment of the present invention, and is a view showing a modified example of a corner cut portion of a molding dam portion. It is a longitudinal cross-sectional view showing a main part of a unit laminated rubber manufacturing apparatus according to an embodiment of the present invention, and is a view showing a modified example of a corner cut portion of a molding dam portion. It is a longitudinal cross-sectional view showing a main part of a manufacturing apparatus for a unit laminated rubber according to an embodiment of the present invention, showing a modified example of a molding dam portion. It is a longitudinal cross-sectional view showing a main part of a manufacturing apparatus for a unit laminated rubber according to an embodiment of the present invention, showing a modified example of a molding dam portion.

Hereinafter, an embodiment of a unit laminated rubber manufacturing apparatus 1 according to the present invention will be described with reference to FIGS. 1 to 4. This unit laminated rubber manufacturing apparatus 1 includes a pair of metal molds 11 and 12 which are disposed so as to be relatively close to and away from each other. In these molds 11 and 12, a cavity C is defined between the holding surface 13 for holding the metal plate W and the holding surface 13 when the mold is clamped, and the unpressurized material supplied on the metal plate W is not added. A pressing surface 14 that crushes the vulcanized rubber R toward the holding surface 13 to form the unvulcanized rubber layer R1 is separately formed.

In the example shown in FIGS. 1 to 4, the pair of molds 11 and 12 are arranged in the upper mold 11 and vertically below the upper mold 11 and are vertically approachable to and separable from the upper mold 11. And a lower mold 12 that is arranged as possible. The holding surface 13 is formed on the upper surface of the lower die 12 that faces upward in the vertical direction, and the pressing surface 14 is formed on the lower surface of the upper die 11 that faces downward in the vertical direction. The upper mold 11 is provided with a gate (not shown) that opens to the pressing surface 14. Through this gate, the unvulcanized rubber R is supplied onto the metal plate W held by the holding surface 13 of the lower mold 12. The lower die 12 is provided with an ejector pin 15 which is supported so as to be retractable from the holding surface 13. The plurality of ejector pins 15 are arranged on the lower die 12 so as to push up a plurality of portions of the metal plate W placed on the holding surface 13. Further, the lower die 12 is provided with holding means (not shown) for holding the metal plate W on the holding surface 13. This holding means is, for example, a magnet or a jig.

Then, in the present embodiment, the outer peripheral edge of the unvulcanized rubber R crushed and expanded by the pressing surface 14 at the time of mold clamping abuts against one of the holding surface 13 and the pressing surface 14 and is molded. The molding weir portion 16 is provided upright. In the examples shown in FIGS. 1 to 4, the molding dam 16 is provided upright on the pressing surface 14, and is formed at a height that abuts on the holding surface 13 during mold clamping. Further, the forming dam 16 is formed in an annular shape in a plan view when viewed from the vertical direction, and has a size such that the metal plate W can be arranged in a space inside thereof (a space surrounded by an inner peripheral surface). Is formed.

Further, in the present embodiment, the escape passage 17 is formed between the molding dam 16 and the pressing surface 14. Due to this escape passage 17, an excess amount R2 of the unvulcanized rubber R, which exceeds the inner volume of the cavity C, of the unvulcanized rubber R supplied onto the metal plate W is stored in the molding weir portion 16 during mold clamping. It goes over the peripheral surface and protrudes to the outside of the cavity C. In the example shown in FIGS. 1 to 4, the escape passage 17 is formed in the molding dam portion 16. Further, the plurality of escape passages 17 are formed in the molding dam portion 16 at intervals in the circumferential direction thereof. The escape passage 17 has an opening that extends over the entire length of the forming weir portion 16 in the radial direction and is open on both the inner peripheral surface and the outer peripheral surface of the forming weir portion 16. Of the peripheral portion of the opening of the escape passage 17 near the cavity C in the molding dam portion 16, a portion (hereinafter, referred to as a corner cut portion) 18 facing the pressing surface 14 (that is, the upper side in the example shown in FIGS. 1 to 3) is As shown in FIG. 1 to FIG. 3, in the longitudinal cross-sectional view of the molding dam 16 along the direction in which the escape passage 17 extends from the inside to the outside of the cavity C, a corner portion α that forms 90° is formed. There is. The angle α of the corner cut portion 18 may be 90° or less, and may be more than 90° and 130° or less.

Further, the cross-sectional area of the flow passage of the escape passage 17 gradually increases from the inside of the cavity C toward the outside. The escape passage 17 is formed such that the length of the molding dam 16 in the circumferential direction gradually increases from the inside of the cavity C to the outside thereof. That is, as shown in FIG. 4, the plan view shape of the escape passage 17 viewed from the vertical direction has a relatively long radial outer side arc and a relatively short radial inner side arc. It forms a fan shape sandwiched by directions. The inner arc is located on the peripheral edge of the opening close to the cavity C (that is, the inner peripheral surface of the forming dam 16), and the outer arc is the peripheral edge of the opening far from the cavity C (that is, the outer periphery of the forming dam 16). Surface).

Next, a method for producing a unit laminated rubber using the unit laminated rubber producing apparatus 1 configured as described above will be described.

First, the weight of the metal plate W is measured in advance before being held on the holding surface 13 of the lower die 12. Based on this measured value, the volume of the unvulcanized rubber R supplied onto the metal plate W in the next supply step is calculated (calculation step). The supply volume of the unvulcanized rubber R is made larger than the inner volume of the cavity C formed at the time of mold clamping. However, when the weight of the metal plate W is relatively large with respect to the average weight, the unvulcanized rubber R is supplied with an unvulcanized rubber so that the supply volume of the unvulcanized rubber R does not become larger than the inner volume of the cavity C formed during mold clamping. The supply volume of the sulfurized rubber R is intentionally reduced. On the other hand, when the weight of the metal plate W is relatively small with respect to the average weight, the unvulcanized rubber R is not yet vulcanized so that the supply volume of the unvulcanized rubber R becomes larger than the inner volume of the cavity C formed at the time of mold clamping. The supply volume of the vulcanized rubber R is intentionally increased.

Next, the metal plate W is placed on the holding surface 13 of the lower die 12 and held by a holding means (not shown). Then, as shown in FIG. 1, unvulcanized rubber R is supplied onto the metal plate W in a mold open state through a gate (not shown) (supply step). At this time, the volume of unvulcanized rubber R calculated in the calculation step is supplied onto the metal plate W. Then, the lower mold 12 is moved so as to approach the upper mold 11, and the mold is clamped as shown in FIG. At this time, the molding dam 16 hits the holding surface 13, and a cavity C is defined between the holding surface 13, the pressing surface 14 and the inner peripheral surface of the molding dam 16. Further, the pressing surface 14 crushes the unvulcanized rubber R on the metal plate W toward the holding surface 13 (that is, downward in the example of FIGS. 1 and 2), and the unvulcanized rubber layer R1. To form. As a result, a unit laminated rubber for seismic isolation structure in which one unvulcanized rubber layer R1 is disposed on one metal plate W is formed (pressing step). In this pressing step, the unvulcanized rubber layer R1 is formed by the outer peripheral edge of the unvulcanized rubber R crushed and expanded by the pressing surface 14 butting against the inner peripheral surface of the molding dam 16 to form the unvulcanized rubber layer R1, Moreover, the excess amount R2 of the unvulcanized rubber R that exceeds the inner volume of the cavity C enters the escape passage 17 and protrudes to the outside of the cavity C.

Next, the lower mold 12 is moved so as to be separated from the upper mold 11, and the mold is opened as shown in FIG. At this time, the corner cut portion 18 of the molding dam portion 16 provided on the pressing surface 14 of the upper mold 11 has an excess portion R2 of the unvulcanized rubber R in the relief passage 17 and an unvulcanized rubber of the cavity C. A shearing force is applied to the connecting portion between the layer R1 and the layer R1. This disconnects this connection. In this mold open state, the ejector pin 15 is advanced upward in the vertical direction from the holding surface 13, and the unvulcanized rubber layer R1 is pushed up by the ejector pin 15. As a result, the unvulcanized rubber layer R1 is released from the mold to obtain the unvulcanized rubber layer R1 as a unit laminated rubber. A seismic isolation structure is formed by heating and vulcanizing a laminated body obtained by laminating a plurality of unit laminated rubbers thus formed in the laminating direction.

As described above, according to the unit laminated rubber manufacturing apparatus 1 and the unit laminated rubber manufacturing method of the present embodiment, the excess amount of the unvulcanized rubber R that exceeds the inner volume of the cavity C at the time of mold clamping. While pressing R2 to the outside of the cavity C, the pressing surface 14 crushes the unvulcanized rubber R and abuts the outer peripheral edge of the unvulcanized rubber R on the inner peripheral surface of the molding dam 16. As a result, the outer peripheral edge of the unvulcanized rubber layer R1 can be molded with high precision by the molding dam portion 16, and the unit laminated rubber having a constant thickness can be accurately formed with a simple structure.

Further, the corner cut portion 18 of the forming weir portion 16 forms a corner portion of 90° in a longitudinal sectional view along the direction of the escape passage 17 of the forming weir portion 16 extending from the inside of the cavity C toward the outside. There is. As a result, due to the fact that the molding weir portion 16 is disposed on the pressing surface 14, the corner cut portion 18 causes the excess portion R2 of the unvulcanized rubber R in the escape passage 17 and the cavity when the mold is opened. It becomes possible to apply a shearing force to the connecting portion of the unvulcanized rubber layer R1 in C. As a result, this connecting portion can be easily cut naturally when the mold is opened.

In addition, the cross-sectional area of the flow passage of the escape passage 17 gradually increases from the inside of the cavity C toward the outside. As a result, when the mold is opened, it is possible to prevent the excess amount R2 of the unvulcanized rubber R located in the escape passage 17 from being pulled back toward the cavity C that was formed when the mold was clamped. As a result, it is possible to surely easily disconnect the connecting portion between the excess amount R2 of the unvulcanized rubber R in the escape passage 17 and the unvulcanized rubber layer R1 in the cavity C when the mold is opened. Further, since the molding dam 16 is abutted against the holding surface 13 at the time of mold clamping, the distance between the holding surface 13 and the pressing surface 14 at the time of mold clamping can be easily and surely made constant. As a result, it is possible to surely realize accurately forming the unit laminated rubber (unvulcanized rubber layer R1) having a constant thickness with a simple configuration.

Further, prior to the supplying step, the weight of the metal plate W held on the holding surface 13 is measured, and the volume of the unvulcanized rubber R supplied onto the metal plate W during the supplying step is determined based on the measured value. Accordingly, when the weight of the metal plate W is heavy and the thickness thereof is large, the supply amount of the unvulcanized rubber R is reduced, while when the weight of the metal plate W is light and the thickness thereof is thin, the unvulcanized rubber R is not added. It is possible to increase the supply amount of the vulcanized rubber R. As a result, the inner volume of the cavity C has an unvulcanized rubber layer R1 whose outer peripheral edge is formed with high precision and when this unvulcanized rubber layer R1 is formed as a unit laminated rubber having a constant thickness. It is possible to suppress the excess R2 of the unvulcanized rubber R that exceeds the required minimum to the necessary minimum.

The technical scope of the present invention is not limited to this embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the present embodiment, in the peripheral portion of the opening of the escape passage 17 in the forming weir portion 16 near the cavity C, the portion (cornered portion) 18 facing the pressing surface 14 is the escape passage 17 of the forming weir portion 16. In the longitudinal sectional view taken along the direction extending from the inside to the outside of the cavity C, the corner portion α is 90°, but the invention is not limited to this. The angle α of the corner cut portion 18 may be 90° or less, and may be greater than 90° and 130° or less.

For example, as shown in FIG. 5A, when the angle α of the corner cutting portion 18 is 90° or less, compared to the case where the angle α of the corner cutting portion 18 is more than 90° and 130° or less, the corner cutting is performed at the time of mold opening. The portion 18 applies a larger shearing force to the connection portion of the unvulcanized rubber R between the excess R2 in the escape passage 17 and the unvulcanized rubber layer R1 in the cavity C. As a result, the corner cutting portion 18 can obtain a greater cutting ability for the unvulcanized rubber R.

Further, as shown in FIGS. 1 to 3 and 5B, when the angle α of the corner cut portion 18 is greater than 90° and 130° or less, compared to the case where the angle α of the corner cut portion 18 is 90° or less. At the time of mold opening, the shearing force applied to the connection between the excess R2 of the unvulcanized rubber R in the escape passage 17 and the unvulcanized rubber layer R1 in the cavity C is small, but this connection It is possible to secure the shearing force necessary for cutting the part. In addition to this, a portion P of the peripheral portion including the outer peripheral edge of the unvulcanized rubber layer R1 after mold opening, which formed the connecting portion together with the excess R2 in the escape passage 17 (FIGS. 3 and 5B). The upper end portion of the outer peripheral edge of the unvulcanized rubber layer R1 can be effectively molded into a corner having an angle of about 90°. When the unvulcanized rubber layer R1 is released from the restrained state at the time of mold opening, this part P becomes round, and it may not be possible to accurately form the corner portion having approximately 90°. On the other hand, when the angle α of the corner cut portion 18 is larger than 90° and larger than 130° and equal to or smaller than 130°, the outer peripheral edge of the unvulcanized rubber layer R1 is a flat surface extending from the lower end to the upper end in the vertical direction. Since it can be molded as described above, the part P can be molded with high accuracy into a corner having an angle of approximately 90°.

As shown in FIGS. 6A and 6B, the molding weir portion 16 is filled with an excess amount R2 of the unvulcanized rubber R that exceeds the inner volume of the cavity C, in addition to the corner cut portion 18 as shown in FIG. 5B. The reservoir 19 may be provided. The pooled portion 19 is a recessed portion that is provided radially inward of the molding dam portion 16 itself and that opens upward in the vertical direction. That is, the reservoir portion 19 is open to the upper surface 16 a of the molding dam portion 16 that faces the escape passage 17 and faces the pressing surface 14 of the upper mold 11. As a result, the reservoir portion 19 communicates with a part of the escape passage 17 on the radially inner side in the vertical direction, and forms one space integrally with the escape passage 17. Further, the reservoir 19 (recess) has one space 19 a surrounded by the molding dam 16. Further, the plan view shape of the pool portion 19 when viewed in the vertical direction forms a fan shape that is radially sandwiched between a relatively long radially outer outer arc and a relatively shorter radially inner inner arc. doing. This fan shape matches the shape of a part of the fan shape shown in FIG. 4 which is a plan view seen from the vertical direction of the escape passage 17 and which is located inward in the radial direction. Such a space 19a, together with the escape passage 17, accommodates an excess amount R2 of the unvulcanized rubber R that exceeds the internal volume of the cavity C. At this time, the space 19a of the reservoir 19 can store an excess amount R2 of the unvulcanized rubber R corresponding to the volume thereof. With such a reservoir portion 19, the outer peripheral edge of the unvulcanized rubber layer R1 can be molded so as to be a flat surface along the vertical direction from the lower end to the upper end, and a part P has a corner portion having an angle of about 90°. It can be molded with high precision.

Although the molding dam 16 is provided upright on the pressing surface 14 in this embodiment, it may be arranged on the holding surface 13. Further, while the molding dam 16 is abutted against the holding surface 13 at the time of mold clamping, instead of this, for example, at the time of mold clamping, a gap is provided between the molding dam 16 and the holding surface 13 to form the lower mold 12. The unit laminated rubber having a constant thickness may be formed by controlling the moving amount of the lower mold 12 when the is approaching the upper mold 11. Further, the ejector pin 15 may not be provided on the lower mold 12. Further, the escape passage 17 may be formed on the pressing surface 14 or may be formed on both the pressing surface 14 and the molding dam portion 16. Further, the escape passage 17 may not be opened on the outer peripheral surface of the molding dam portion 16 but may be opened only on the inner peripheral surface. Further, the cross-sectional area of the flow passage of the escape passage 17 may be changed as appropriate, for example, equal over the entire length in the radial direction of the molding dam portion 16. Moreover, you may perform a supply process directly, without going through a calculation process.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

According to the present invention, the outer peripheral edge of the unvulcanized rubber layer can be molded with high accuracy, and the unit laminated rubber having a constant thickness can be accurately formed with a simple structure.

1 Unit Laminated Rubber Manufacturing Equipment 11 Upper Mold (Mold)
12 Lower mold (mold)
13 Holding surface 14 Pressing surface 16 Molding weir part 16a Upper surface 17 Relief passage 18 Corner cut part 19 Reservoir part 19a Space C Cavity R Unvulcanized rubber R1 Unvulcanized rubber layer R2 Excess amount W Metal plate α angle P Unvulcanized rubber layer Part of

Claims (8)

A pair of molds arranged so that they can relatively approach each other and separate from each other,
In the pair of molds,
A holding surface for holding the metal plate,
A pressing surface that defines a cavity between the holding surface and the unvulcanized rubber supplied on the metal plate toward the holding surface to form an unvulcanized rubber layer during mold clamping. When,
Are formed separately,
A unit laminated rubber manufacturing apparatus for manufacturing a unit laminated rubber for a seismic isolation structure, wherein one unvulcanized rubber layer is disposed on one of the metal plates,
The pressing surface is provided with a molding weir portion formed by being pressed against the outer peripheral edge of the unvulcanized rubber expanded and crushed by the pressing surface during mold clamping,
Of the unvulcanized rubber supplied onto the metal plate, an excess amount exceeding the inner volume of the cavity between the molding dam portion and the pressing surface overflows to the outside of the cavity during mold clamping. An escape passage is formed ,
The molding dam is a unit laminated rubber manufacturing apparatus that abuts against the holding surface during mold clamping . The forming dam portion is disposed on the pressing surface, and the escape passage is formed in the forming dam portion,
Of the peripheral edge portion of the opening of the escape passage near the cavity in the forming weir portion, the portion facing the pressing surface is in a direction in which the escape passage of the forming weir portion extends from the inside of the cavity toward the outside. The manufacturing apparatus for a unit laminated rubber according to claim 1, wherein a corner portion is 90° or less in a longitudinal sectional view taken along the line. The unit laminated rubber manufacturing apparatus according to claim 2, wherein the cross-sectional area of the flow passage of the escape passage gradually increases from the inside to the outside of the cavity. 2. The unit laminated rubber manufacturing apparatus according to claim 1, wherein the molding weir portion includes a recess facing the relief passage and opening on an upper surface of the molding weir portion facing the pressing surface. 2. The unit laminated rubber manufacturing apparatus according to claim 1, wherein a plurality of the escape passages are formed in the molding dam portion at intervals in the circumferential direction. The unit laminate according to claim 1, wherein the escape passage has an opening that extends over the entire length in the radial direction of the forming weir portion and opens on both the inner peripheral surface and the outer peripheral surface of the forming weir portion. Rubber manufacturing equipment. Using the unit laminated rubber manufacturing apparatus according to any one of claims 1 to 6 ,
A supply step of supplying unvulcanized rubber in a mold open state on the metal plate held on the holding surface,
A pressing step of crushing the unvulcanized rubber toward the holding surface by the pressing surface during mold clamping to form an unvulcanized rubber layer, and manufacturing the unit laminated rubber,
A method for manufacturing a unit laminated rubber having:
The supplying step supplies, on the metal plate, an unvulcanized rubber having a volume larger than the inner volume of the cavity,
In the pressing step, the outer peripheral edge of the unvulcanized rubber crushed and expanded by the pressing surface is abutted against the molding dam to be molded, and the unvulcanized rubber exceeds the inner volume of the cavity. The method for producing a unit laminated rubber in which the excess amount of (1) is made to enter the escape passage and protrude to the outside of the cavity. Prior to the supplying step, the weight of the metal plate held on the holding surface is measured, and the volume of unvulcanized rubber supplied onto the metal plate during the supplying step is determined based on the measured value. 7. The method for producing a unit laminated rubber according to 7 .

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