JP2002292634A - Mold for molding elastic rubber body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve molding workability and productivity without being troubled in mold-setting and mold-releasing while though the same mold is repeatedly used, inferiority in molding is not generated, and a high molding precision can be always secured. SOLUTION: In a mold comprising a top mold 1, a middle mold 2 and a bottom mold 3 for molding a laminated rubber 6 by heating and curing the rubber in a hermetically sealed hollow part 5 to be formed by assembling those respective molds 1, 2 and 3, the middle mold 2 comprises an inner middle mold 20 positioned to the hollow part 5 side and an exterior middle mold 20B positioned so as to surround its periphery; the inner middle mold 20A is peripherally divided into a plurality of pieces; besides the exterior middle mold 20B ranges peripherally in a line as one body, and a cylindrical and integrated product is formed so that its inner peripheral tapered surface 20 is likely to come in contact with an outer peripheral tapered surface 20a of the inner middle mold 20A in the mold assembled state with the inner middle mold 20A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly prevents the damage to a building such as a building or a bridge by absorbing a vibration force input to the building when an earthquake occurs or the like and reducing the acceleration of the vibration. The present invention relates to a mold for molding an elastic rubber body used for molding a laminated rubber for seismic isolation or bearing.

[0002]

2. Description of the Related Art Conventionally, a mold having a structure as shown in FIGS. 4 and 5 has been generally used as a mold for molding a three-dimensional elastic rubber body such as laminated rubber for seismic isolation or bearing. I was The conventional general molding die shown in FIGS. 4 and 5 includes an upper die 1, a middle die 2, and a lower die 3, of which
The middle mold 2 is divided into two parts in the circumferential direction. Bolts and nuts are formed by extending portions 2a, 2a in which the divided middle molds 2A, 2A are integrally extended from the divided middle molds 2A, 2A toward the outside in a radial direction. It is configured such that it can be assembled and removed by fastening and unfastening via 4 and 4.

[0003] Using a molding die having the above-described structure, a seismic isolation or bearing laminated rubber, which is an example of an elastic rubber body,
That is, a plurality of thin steel plates 6a and elastic rubber plates 6b are alternately laminated, and the outer periphery thereof is covered with an elastic rubber 6c. When the laminated rubber 6 for seismic isolation or bearing is formed by integrally attaching and fixing the mounting flanges 6f, 6f of the above, the divided middle dies 2A, 2A are bolted to each other before molding.
After fastening the nuts 4 and 4 to form the middle mold 2,
By placing the thin steel plates 6a at predetermined intervals in the middle mold 2 and setting the mounting flanges 6f, 6f at the upper and lower positions, and assembling the upper mold 1 and the lower mold 3 with the middle mold 2, each mold is formed. A closed cavity 5 surrounded by 1, 2, and 3 is formed.

In this state, by injecting raw rubber into the cavity 5 and vulcanizing it by heating, predetermined flanges 6f, 6f
To form a laminated rubber 6 having the same. After the molding, the upper mold 1 and the lower mold 3 are removed, the bolts and nuts 4 and 4 are removed, the fastening of the divided middle dies 2A, 2A is released, and the middle mold 2 is removed to form a predetermined shape. Flange 6f,
Take out the laminated rubber 6 with 6f.

In FIGS. 4 and 5, the laminated rubber 6 with flanges 6f, 6f for seismic isolation or bearing is shown as a molding object. A mold having the same structure as described above is used even when a simple three-dimensional cylindrical elastic rubber body is formed by heating and vulcanizing.

[0006]

In the conventional elastic rubber molding die having the above-described structure, the emergency acting on the divided portion of the middle mold 2 which is divided into two due to the volume expansion of the rubber during the heating and vulcanization. In order to be able to sufficiently withstand strong forces, the divided middle dies 2A, 2A are
Means for strong fastening using a large diameter or a plurality of sets of bolts and nuts 4 and 4 have been taken. Therefore, when the same mold is repeatedly used many times, the extension portions 2a, 2a, which are the fastening portions, are damaged or deformed, so that defective molding portions are easily generated, and the molding accuracy decreases with time. . In addition, the bolts and nuts 4 and 4 must be fastened before molding, and the bolts and nuts 4 and 4 must be unfastened after molding. This requires a lot of time and effort, and lacks molding workability and productivity.

[0007] The present invention has been made in view of the above circumstances, does not cause molding defects even when used repeatedly, can always ensure high molding accuracy, and requires time and effort to assemble and remove the mold. Another object of the present invention is to provide an elastic rubber body molding die that can contribute to improvement in molding workability and productivity.

[0008]

In order to achieve the above-mentioned object, an elastic rubber molding die according to the present invention comprises an upper die, a middle die and a lower die, and is formed by assembling these dies. An elastic rubber body molding die for heating and vulcanizing rubber in a closed cavity to form an elastic rubber body having a predetermined three-dimensional shape, wherein the middle mold is an inner middle mold located on the cavity side and an inner middle mold thereof. It consists of an outer / middle mold positioned to surround the outer circumference, of which the inner / middle mold is divided into a plurality in the circumferential direction, and the outer / middle mold is continuously integrated in the circumferential direction and integrally assembled with the inner / middle mold. In this case, the inner peripheral surface is formed as a cylindrical integral product that comes into contact with the outer peripheral surface of the inner and middle dies.

According to the present invention having the above structure, an inner / outer two-layer structure formed by assembling the inner / middle mold divided into a plurality in the circumferential direction and the cylindrical outer / middle mold continuously and integrally connected in the circumferential direction. By using the medium size, the strong compressive force generated due to the volume expansion of the rubber during the heating and vulcanization is transmitted to the outside medium size via the inside medium size and received by the outside medium size. At this time, since the outer and middle dies are cylindrically integrated products, the compressive force is dispersed in the circumferential direction and can be uniformly received over the entire circumference of the outer and middle dies without concentrating a strong force locally. by this,
Even if the same mold is used many times, part of the middle mold will not be locally deformed or damaged,
High molding accuracy can be ensured even for repeated use.

[0010] In addition, since there is no fastening portion using bolts and nuts, the time required for assembling and removing the mold is greatly reduced, and the molding workability and productivity of a predetermined elastic rubber body can be improved. It is.

[0011] In the elastic rubber body molding die having the above-mentioned structure, the outer peripheral surface of the inner and middle dies and the inner peripheral surface of the outer and middle dies which are in contact with the inner and middle dies in the axially assembled state are preferably arranged in the axial direction. By forming on the tapered surface, the mold assembly and removal of the inner and middle molds and the outer middle mold become a taper fitting system, which greatly simplifies and facilitates the mold assembly and removal work. The inner peripheral surface of the outer and middle molds is strongly brought into close contact with the outer peripheral surface of the mold, and a step or the like is generated on the inner peripheral surface formed by the plurality of divided inner and middle molds, which causes a molded product (elastic rubber body)
It is possible to reliably prevent the occurrence of a molding defect such as a defective portion or deformation.

In the above-described elastic rubber body molding die, the inner and middle dies are made of a material having a high thermal conductivity such as aluminum.
During molding, that is, during heat vulcanization, heat radiation to the outside is suppressed by the presence of the outer middle mold that surrounds the outer periphery of the inner middle mold, while the heat dissipation from the inner middle mold exposed by removal from the outer middle mold after molding is performed. , And the cycle of repeated use of the inner / middle mold, which is at the highest temperature during molding, can be shortened, whereby the productivity of the elastic rubber body by one molding die can be further promoted.

[0013]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an assembled state of a molding die used when the elastic rubber body to be molded is the above-described laminated rubber 6 for seismic isolation or bearing, and FIG. 2 is a transverse sectional view thereof. The molding die is composed of the upper mold 1, the middle mold 2 and the lower mold 3, and the laminated rubber 6 for seismic isolation or bearing to be molded is made of a plurality of thin steel plates 6a.
And an elastic rubber plate 6b are alternately laminated, and the outer peripheral portion thereof is covered with an elastic rubber 6c.
That f and 6f are integrally bonded and fixed has already been described with reference to FIGS. 4 and 5. The difference between the molding die of the present invention and the conventional molding die lies in the configuration of the middle die 2. Hereinafter, the difference will be described in detail with reference to FIGS.

That is, the middle mold 2 in the molding die of the present invention surrounds the inner middle mold 20A located on the side of the cavity 5 formed by assembling the dies 1, 2, 3 and the outer periphery of the inner middle mold 2OA. It consists of two layers of the outer and middle sized 2OB. Among them, the inner-middle mold 2OA is formed by combining arc-shaped mold pieces 20i... Equally divided into a plurality of pieces (in the drawing, four, but two, three, or five or more pieces) in the circumferential direction. The outer peripheral surface 20a is formed in a tapered surface such that its diameter becomes gradually larger toward the lower end in the cylinder axis direction.

On the other hand, the outer / middle mold 2OB is formed (manufactured) from a material having a high thermal conductivity, such as aluminum, into a cylindrical integral product which is continuously and integrally connected in the circumferential direction. In this state, the inner peripheral surface 20b in contact with the outer peripheral surface 2Oa of the inner / middle mold 20A is formed in a tapered surface such that the diameter gradually increases toward the lower end in the cylinder axis direction.

In forming the seismic isolation or bearing laminated rubber 6 which is an example of the object to be molded by using the molding die having the above-described structure, first, before forming, the rubber is divided into a plurality of pieces in the circumferential direction. Are combined to form a cylindrical inner / middle mold 20A, and an outer / middle mold 20B of a cylindrical integrated product is provided on the outside of the inner / middle mold 20A so that the tapered surfaces 20a and 20b thereof are in close contact with each other. After the middle mold 2 having the inner and outer two-layer structure is assembled by fitting with each other, the thin steel plates 6a are arranged at predetermined intervals in the middle mold 2, and the mounting flanges 6f, 6f are set up and down. By assembling the upper mold 1 and the lower mold 3 with the middle mold 2, the closed cavity 5 surrounded by the molds 1, 2, 3 is formed.
To form

In this state, raw rubber is injected into the hollow portion 5 and heated and vulcanized, so that predetermined flanges 6f, 6f
To form a laminated rubber 6 having the same. The strong compressive force generated due to the volume expansion of the rubber that is heated and vulcanized during molding is transmitted to the outer middle mold 20B via the inner middle mold 20A in the middle mold 2. Here, since the outer middle mold 20B is a tubular integral product, the inner middle mold 2B
The compressive force transmitted from 0A is distributed in the circumferential direction, without concentrating a strong force locally, and can be uniformly received over the entire circumference of the outer and middle mold 20B, and if the same molding die is used repeatedly. Also, a part of the middle mold 2 is not locally deformed or damaged, and high molding accuracy can be secured for repeated use.

After the molding, the upper mold 1 and the lower mold 3 are removed, and the outer middle mold 20B is formed along the tapered surfaces 20a, 20b.
Are pulled out from the inner and middle molds 20A in the direction of the axis of the cylinder, and the divided arc-shaped mold pieces 20i are disassembled to easily remove the middle mold 2 to form flanges 6f, 6f formed into a predetermined shape. The attached laminated rubber 6 can be taken out.

The inner / middle mold 20A of the middle mold 2 is not only made of a material having a high thermal conductivity such as aluminum, but is also detached from the outer / middle mold 20B. It is exposed to a larger area than at the time of molding, so that the residual heat is efficiently released to the outside and cooled. As described above, the excellent heat dissipation property immediately after demolding makes it possible to shorten the cycle of repeated use of the inner / middle mold 20A having the highest temperature at the time of molding, thereby improving productivity by repeatedly using one molding die. Can be promoted.

In the above-described embodiment, the outer peripheral surface 20a of the inner / middle mold 20A and the inner peripheral surface 20b of the outer / middle mold 20B in the middle mold 2 are formed into tapered surfaces such that the diameter gradually increases toward the lower end in the cylinder axis direction. Was explained, but FIG.
As shown in the figure, even when the tapered surface is formed such that the diameter becomes gradually larger toward the upper end in the cylinder axis direction, as in the embodiment, the mold assembly of the inner / middle mold 2 and simplification of the demolding operation can be simplified. Can be achieved.

In the above-described embodiment, the case where the present invention is applied to the formation of the cylindrical laminated rubber 6 for seismic isolation or bearing is described. Needless to say, the object of molding is not limited to laminated rubber for seismic isolation or bearings. By heating and vulcanizing a single rubber, a simple three-dimensional elastic rubber body such as a cylindrical or prismatic shape is formed. The case is also applicable.

[0022]

As described above, according to the present invention,
By using a mold formed of an inner / outer two-layer structure by a mold combination of an inner / middle mold which is divided into a plurality of pieces in the circumferential direction and a cylindrical outer / middle piece which is continuously and integrally connected in the circumferential direction, as the middle mold, The strong compressive force generated by the volume expansion of the rubber during sulfurization is distributed in the circumferential direction of the outer and middle mold, which is a cylindrical integrated product, so that a strong force is not concentrated locally, and it is uniform over the entire circumference of the outer and middle mold. Because it can be received, even if the same mold is used repeatedly, there is no molding failure caused by local deformation or breakage of a part of the middle mold, and molding is always high for repeated use Accuracy can be ensured.
In addition, since there is no fastening part using bolts and nuts as in the conventional example, the time required for assembling and removing the mold is extremely small, and the workability and productivity of molding a predetermined elastic rubber body can be improved. It works.

In particular, according to the second aspect of the present invention, in addition to the above-described effects, simplification of a medium-sized mold assembly and demolding operation,
In addition to facilitating molding, it is possible to reliably prevent the occurrence of molding defects.

According to the third aspect of the present invention, in addition to the above-described effects, the heat radiation from the inner / middle mold, which has the highest temperature after molding, is enhanced while suppressing the heat radiation during heating and vulcanization. The cycle of repeated use of the middle mold can be shortened, and the productivity of the elastic rubber body can be further improved by repeatedly using one molding die.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an assembled state of a molding die according to an embodiment of the present invention when this die is applied to molding of a laminated rubber for seismic isolation or bearing.

FIG. 2 is a cross-sectional plan view taken along line XX of FIG.

FIG. 3 shows another embodiment of the molding die according to the present invention,
It is a longitudinal cross-sectional view which shows the mold | assembly state when this metal mold | die is applied to shaping | molding of the laminated rubber for seismic isolation or a bearing.

FIG. 4 is a longitudinal sectional view showing a conventional mold for molding, in which the mold is applied to the formation of laminated rubber for seismic isolation or bearing.

FIG. 5 is a cross-sectional plan view taken along line YY of FIG. 4;

[Explanation of symbols]

 Reference Signs List 1 upper die 2 middle die 3 lower die 5 cavity 6 laminated rubber (one example of elastic rubber body) 6a thin steel plate (hard plate) 6a elastic rubber plate 6c coated elastic rubber 20A inner middle mold 20B outer middle mold 20a, 20b tapered surface

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F202 AA45 AA46 AG03 CA09 CB01 CB22 CN01 4F203 AA45 AA46 AG03 DA11 DB01 DC01 DK01

Claims (4)

[Claims] 1. An elastic body comprising an upper mold, a middle mold, and a lower mold, wherein rubber is heated and vulcanized in a closed cavity formed by assembling these molds to form a predetermined three-dimensional elastic rubber body. A mold for forming a rubber body, wherein the middle mold is composed of an inner middle mold located on the cavity side and an outer middle mold located so as to surround the outer periphery thereof, of which the inner middle mold is divided into a plurality in the circumferential direction. The outer and middle dies are connected to the inner and middle dies in a circumferentially continuous manner, and are formed into a cylindrical integrated product such that the inner peripheral surface thereof contacts the outer peripheral surface of the inner and middle dies in a state of being assembled with the inner and middle dies. A mold for molding an elastic rubber body. 2. The elastic rubber body molding die according to claim 1, wherein the outer peripheral surface of the inner / middle mold and the inner peripheral surface of the outer / middle mold that comes into contact with the inner / middle mold in an assembled state are tapered in the axial direction. . 3. The mold for molding an elastic rubber body according to claim 1, wherein the inner / middle mold is made of a material having high thermal conductivity. 4. The elastic rubber body to be molded is a laminated rubber formed by alternately laminating a plurality of hard plates and elastic rubber plates and covering their outer peripheral portions with elastic rubber. 4. The mold for molding an elastic rubber body according to any one of claims 1 to 3.