JP3404258B2 - Method of forming unvulcanized rubber layer in manufacturing process of rubber laminate for seismic isolation etc. - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular rigid plate such as a rubber laminated body for building seismic isolation or a rubber laminated body for bridge support (referred to as a rubber laminated body for seismic isolation or seismic isolated rubber). The present invention relates to a method for forming an unvulcanized rubber layer in a manufacturing process of a rubber laminate in which vulcanized rubber and an unvulcanized rubber layer are alternately laminated and vulcanized and integrated. These support rubbers are columnar shapes, square columnar shapes, etc., and are blocks in which metal plates (rigid plates) and viscoelastic rubber layers are alternately laminated and integrated. A building seismic isolation rubber laminate is, for example, a device that is installed between a general building and the ground / foundation to attenuate direct transmission of vibration such as an earthquake to the building,
As shown in FIG. 5, the apparatus has a rigid plate 1 and a vulcanized rubber layer 33 alternately laminated between an upper flange 30 and a lower flange 31. The seismic isolation rubber laminate 29 has a cylindrical shape, and has a cavity 32 for a plug pin in the center thereof. The rubber for bridge support has a structure similar to that shown in FIG. 5, and is mounted between, for example, a bridge and a pier on an expressway to damp transmission of vibration of a vehicle traveling to the surrounding area.

[0002]

2. Description of the Related Art Usually, a plurality of rigid plates are used which are formed by bonding a circular metal plate (iron plate) to each other (in the case of a cylindrical molded product). In addition, fiber-reinforced resin plate (FRP)
Etc. may be used. The adhesion treatment of the metal plate is to improve the adhesive force with the rubber, and an adhesive may be applied and dried, or the metal plate may be subjected to electroless nickel plating.

The rubber layer is designed according to the required physical properties (viscoelasticity, etc.) of the product, and includes NR, CR, BR, IR and EP.
DM, EPR and the like are used alone or in combination of two or more, and a filler, a plasticizer, a tackifier, an oil, a lubricant, a vulcanizing agent, a vulcanization accelerator and the like are mixed. These are weighed and blended, kneaded with a Banbury mixer, an open roll, etc., and then formed into a sheet with a calendar, T-die or the like. Rolled unvulcanized rubber sheets are laminated in a single layer or a plurality of layers to have a predetermined thickness, and the obtained layer or laminated rubber sheets are punched into a disc shape, a square shape, or cut into a semicircle or a half square. In addition, a part of the sheet is cut out with a constant width or added to adjust the weight to a predetermined value. This rubber layer is overlaid on the rigid plate, mounted on a vulcanization mold, and pressed and heated to finish the desired supporting rubber or the like.

[0004]

The conventional molding method described above has the following problems.

1) Due to punching, there is much loss of unvulcanized rubber. That is, since a continuous unvulcanized rubber sheet is punched according to the size of the product, punched debris is generated and the sheet can be molded again, but it causes a large loss.

2) A punching blade must be prepared for each product size, which is problematic in terms of cost and delivery time.

3) Since unvulcanized rubber sheets are mass-produced with a predetermined thickness by a calendar or the like, it is necessary to individually adjust the weight according to the individually designed products,
The man-hour increases. For example, when the thickness of the designed rubber sheet exceeds the thickness of the rolled rubber sheet, it is necessary to stack two or more sheets.

4) When a rubber layer is placed on a rigid plate and mounted on a vulcanization mold and vulcanized, air between the rubber layer and the rigid plate and gas generated by the vulcanization are contained in the rubber layer. It may stay, reducing the adhesive strength and impairing the physical properties.

[0009]

In order to solve the above-mentioned problems, a method for molding an unvulcanized rubber layer in the production of a rubber laminate for seismic isolation or the like according to the present invention is a circular rigid plate and a disc-shaped method. After alternately laminating the unvulcanized rubber layer, in the step of forming the unvulcanized rubber layer in the production of the rubber laminate to be vulcanized,
While rotating the rigid plate, a string-shaped unvulcanized rubber material is laid out in a spiral shape so as to be adjacent to each other from the center portion of the upper surface to the outer peripheral edge portion, and then the spiral unvulcanized rubber material is pressed. It is pressed to form a disc-shaped unvulcanized rubber layer.

The present invention is a method for manufacturing a rubber laminate by alternately laminating a circular rigid plate and a disc-shaped unvulcanized rubber layer, and then vulcanizing the circular rigid plate. For example, an adhesive treatment is performed so that a strong adhesion can be achieved by laminating the rubber vulcanizate layers and applying pressure and heat. And
The rigid plate is placed on a rotating means (rotary table) that rotates about the same rotation center and rotates at a predetermined speed. The rotation speed is linked to the extrusion speed of the unvulcanized rubber material described below,
Further, it is adjusted by the supply position of the unvulcanized rubber material.

On the upper surface of the rotating rigid plate, the unvulcanized rubber material extruded in the shape of a string is laid out in a spiral shape so as to be adjacent to the outside from the center of the rigid plate. Since the rigid plate rotates, the rubber cords can be laid out in a spiral shape only by moving the supply position of the rubber cord in the radial direction of the rigid plate. A rigid plate having unvulcanized rubber material lined up to a predetermined diameter on a top surface is sandwiched by, for example, a pressing machine having a flat pressing platen and pressed to obtain a string-shaped body having a substantially circular cross section. The vulcanized rubber material is crushed to form a flat plate-shaped unvulcanized rubber layer. A small spirally continuous recess remaining between the adjacent unvulcanized rubber materials functions as a flow path for discharging generated gas during vulcanization in a vulcanization mold, which will be described later. Further, when pressurizing the disc-shaped unvulcanized rubber material, it is possible to facilitate air outflow by placing a Teflon sheet or a non-woven fabric having a releasing property on the upper surface of the unvulcanized rubber. it can.

An unvulcanized rubber laminate, in which a predetermined number of unit laminates of the obtained rigid plate and the unvulcanized rubber layer (which are simply placed at this stage) are laminated, is placed in a vulcanization mold. By pressing and heating, a rubber laminate for a predetermined seismic isolation or the like can be obtained.

According to a second aspect of the present invention, the rotational speed of the rigid plate is such that the supply speed of the unvulcanized rubber material and the surface speed of the rigid plate match at the position where the unvulcanized rubber material is supplied. As described above, it is desirable that the supply position of the unvulcanized rubber material becomes slower from the central portion of the rigid plate to the outer peripheral edge portion.

With this configuration, the rotational speed of the rigid plate becomes lower as the position where the unvulcanized rubber material is supplied extends from the central portion of the rigid plate to the outer circumference, and the rotational speed of the unvulcanized rubber material and the above The surface velocity of the rigid plate matches. By adjusting the rotation speed in this way, the size (thickness, resulting in the thickness of the rubber sheet) of the unvulcanized rubber material (plastic and easily stretched) extruded at a constant speed is kept constant. However, it can be spread over the entire surface of the rigid plate. The unvulcanized rubber material is guided by, for example, a rubber material guide means capable of swinging in the radial direction of a disc-shaped rigid plate, and the supply is started from a predetermined position near the center of the rigid plate. At the tip of the rubber material guide means, a conical pressing roller that becomes thicker is connected to the outer peripheral side of the rigid plate (a flanged roller may be used). As a result, when the pressing roller is installed at a predetermined position on the rigid plate at the beginning of winding and the unvulcanized rubber material is supplied, the pressing roller moves while being biased toward the outer peripheral side with the wound unvulcanized rubber material as the base point. . By detecting the swinging angle of the rubber material guiding means by this movement and adjusting the rotation speed of the rotary table, the thickness of the unvulcanized rubber material wound can be kept constant.

As described in claim 3, it is preferable that the rubber cord has a substantially circular cross section and that a lubricant such as zinc stearate is sprinkled on the upper surface of the rigid plate.

As described above, the unvulcanized rubber material needs to be in contact with each other, and it is desirable that the unvulcanized rubber material can be easily moved from the supplied position toward the center. Compared to the rubber column having a rectangular column shape, it is easier for the columnar column to move, and the lubricant, for example, powder that does not impair the adhesive force with the rigid plate can be moved to move the unvulcanized rubber material. It will be easier. When the unvulcanized rubber material is extruded and wound around the rigid plate, the unvulcanized rubber material is slightly stretched and becomes a force to move toward the central portion due to its restoring force.

As described in claim 4, when laying unvulcanized rubber material on the rigid plate, a plurality of wires (for example, from the center of the upper surface of the rigid plate toward the outer peripheral edge) are radially formed. , Steel wire), and then laying unvulcanized rubber material on it spirally, pressurizing and then pulling out the wire material,
It is desirable to form an air vent passage (fine groove).

With this structure, when the unvulcanized rubber material is pressurized, in addition to the outflow of air existing between the unvulcanized rubber layer and the rigid plate, the rubber is removed through the air vent passage (fine groove). Since the gas generated by vulcanization easily flows out, troubles caused by the gas can be eliminated. That is, the wire is in a state of being embedded in the unvulcanized rubber layer but does not adhere to it, and a narrow groove is formed in the trace by pulling out the wire after press molding. Since the narrow groove easily flows out the air and the generated gas which are present between the unvulcanized rubber layer and the rigid plate during the subsequent vulcanization, troubles due to the gas interposition can be eliminated.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for manufacturing a rubber laminated body for seismic isolation or the like according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view for explaining the outline of an apparatus used in the manufacturing method of the present invention, and FIG. 2 is a left side view showing a part of the apparatus of FIG. 1 in a cross section (AA cross section). 3 is a plan view thereof.

As shown in FIG. 1, the apparatus preferably used in the manufacturing method of the present invention is such that a circular rigid plate 1 is provided on the upper surface of a rotary table 3 which is rotated by a rotary motor 4 so as to be shiftable. Place them with their centers aligned. In this embodiment, the unvulcanized rubber layer of the building seismic isolation rubber laminate 29 (FIG. 5) is formed, and the rigid plate 1 is a circular steel plate having a circular space formed in the center thereof. Then, an adhesive with rubber is applied and dried. In order to position and hold the rigid plate 1, a central disc 15 is installed at the center of rotation thereof.

On the other hand, the extruder 12 is installed in the vicinity of the rotary table 3, and a rubber material guide means 21 for guiding the unvulcanized rubber material 2 is bridged therebetween. The rubber material guide means 21 is
A guide support rod 11 capable of swinging in the direction of the arrow Y, a guide frame 9 supported at one end by the guide support rod 11 and hung between the rotary table 3 and the other end of the guide frame 9. A pressing roller 7 attached via a pressing roller support rod 8 is provided at (the end portion in contact with the rotary table 3). The extruder 12 is not specified as long as it can extrude a normal unvulcanized rubber into a string shape. The rubber material 13 is obtained by kneading a rubber composition having a compounding design with a Banbury mixer or the like, rolling it into a sheet with a calendar or the like, cutting it into a tape, and winding it up on an unwind reel 14.

The guide support rod 11 has a swing shaft 22 attached to the upper end of a fixed shaft 23, and a guide frame 9 attached to the swing head 22. The swing head 22 can swivel (swing) in the direction of the arrow Y, and from the position where the pressing roller 7 described later comes into contact with the central disc 15 to the outer peripheral edge portion of the rigid plate 1 as the molding work progresses. The guide frame 9 is supported so as to be movable throughout. The position or angle of the swing head 22 is detected by means (not shown) to control the rotation speed of the rotary table 3. That is, when the pressing roller 7 is at the molding start position, the rotation speed is fast, and the rotation speed becomes slower as it approaches the outer peripheral edge of the rigid plate 1, and the supply speed of the unvulcanized rubber material 2 and that To match the surface velocity of the rigid plate 1.

As shown in the partial cross section of FIG. 2, the pressing roller 7 is formed in a conical shape (which may be a collared roller) which narrows toward the central portion of the rigid plate 1, and the pressing roller supporting rod 7 is used. It is supported by the guide frame 9. The pressing roller 7 is supported by the guide frame 9 by a fulcrum 16 (see FIG. 3). Further, it is preferable that the pressing roller 7 is slightly biased toward the central portion. This is because the pressing roller 7 is pressed against the unvulcanized rubber material 2. Further, since the pressing roller 7 has a conical shape, the pressing roller 7 is biased toward the outer peripheral edge with the unvulcanized rubber material 2 around which the winding is performed as a base point (in the direction of the center) as the winding work progresses. The guide frame 9 is moved in the outer peripheral direction. Due to this urging toward the outer peripheral edge, the guide frame 9 moves to the swing head 22.
Is swinging around. A guide pulley 10 is attached to an upper portion of the guide frame 9 to guide the supplied unvulcanized rubber material 2 toward the pressing roller 7.

The molding procedure of the present invention using the apparatus having the above construction is as follows. That is, the rotary motor 4
The rigid plate 1 is placed with its center aligned with the rotary table 3 rotated by, and the unvulcanized rubber material 2 extruded in the shape of a string is placed on the upper surface of the rigid plate 1 at the central portion (central disk 15).
From the position where it touches) and lay it out in a spiral pattern. Specifically, first, the rubber material 13 prepared on the unwinding reel 14 is supplied to the material supply port 24 of the extruder 12 whose conditions have already been set, and the string-shaped unvulcanized rubber material 2 is supplied from the extrusion head 25. Push out. The unvulcanized rubber material 2 pushed out is guided by the guide pulley 10 of the rubber material guide means 21 and reaches the vicinity of the pressing roller 7. When the rotary table 3 is rotated and the rigid plate 1 is rotated, the unvulcanized rubber material 2 is urged toward the central disc 15 of the rigid plate 1 by its contracting force, and is wound in a spiral shape more densely than the central portion. . Due to its shape, the pressing roller 7 is supported by the unvulcanized rubber material 2 wound around and is biased in the outer peripheral direction, and moves the guide frame 9 to the outer peripheral side in accordance with the progress of the molding operation.

The unvulcanized rubber material 2 and the rigid plate 1 formed as described above are integrally removed from the rotary table 3,
In the next step (pressing step), pressure is applied to form the unvulcanized rubber layer 20. The pressing process is as shown in FIG.
The rigid plate 1 around which the unvulcanized rubber material 2 is wound is placed on the upper surface of the lower pressurizing plate 17, and the upper pressurizing plate 18 is lowered from the upper side by the elevating cylinder 19 to compress and press the unvulcanized rubber material 2. And adhere to each other to eliminate the space between them to form a single unvulcanized rubber layer 20 (FIG. 4, right diagram). Subsequently, in a vulcanizing step (not shown), a predetermined number of molded articles 26 are filled in the mold and vulcanized.

In the method according to claim 2, when the unvulcanized rubber material 2 is wound around the rigid plate 1 as described above, the angle of the swing head 22 which changes as the guide frame 9 moves to the outer peripheral side. (Y) or the position of the guide frame 9 is detected to reduce the rotation speed of the rotary table 3 to prevent the size of the unvulcanized rubber material 2 from decreasing.

In the method according to claim 3, as shown in FIG. 1, the extrusion head 25 has a circular nozzle shape,
By forming the cross section of the obtained unvulcanized rubber material 2 into a circular shape, the unvulcanized rubber material 2 is wound around the rigid plate 1 in a spiral shape and is urged toward the center part to easily roll, and adjacent unvulcanized rubber materials 2 are mutually Easy to adhere. In addition, it is possible to make it easier to move by spraying a lubricant on the upper surface of the rigid plate. This lubricant should not inhibit the adhesive force between the rigid plate 1 and the unvulcanized rubber material 2, and for example, zinc stearate powder is preferably used.

According to a fourth aspect of the present invention, a plurality of wire rods are arranged radially from the central portion of the upper surface of the rigid plate 1 toward the outer peripheral edge portion (position of the virtual line B shown in FIG. 3), and then on top of that. The unvulcanized rubber extruded material is laid in a spiral shape on the. After press-pressing this, the unvulcanized rubber layer 20 in contact with the rigid plate is obtained by manually or mechanically pulling out the wire (see FIG. 4).
A thin groove is formed radially to communicate with the outer peripheral portion. As the wire material, a steel wire having a cross-sectional diameter of about 1 mm and a surface coated with Teflon is preferably used. Due to the narrow grooves formed, air and gas can be easily released in the subsequent vulcanization step, and troubles due to physical properties and adhesion of the obtained seismic isolation rubber are reduced.

With respect to the method for forming a rubber laminate, which is based on the above-described molding of the unvulcanized rubber layer, concrete examples of a rigid plate, an unvulcanized rubber material and the like will be described. The rigid plate 1 has an outer diameter of 800 mm, an inner diameter of 101 mm, and a thickness of 2.7.
39 mm circular steel plates (eg, SS400, SPHC) were prepared, washed with a neutral surfactant, blasted with a cleaning agent, and then an adhesive (eg, Chemlock 2
05, METALLOCK G21) was applied and dried.

The composition of the unvulcanized rubber material is 100% natural rubber.
Parts, carbon 15 parts, oil 7 parts, and vulcanizing agent 3 parts were used. After kneading this composition with a Banbury mixer, it was extruded with a rubber extruder into a cord having a diameter of about 8 mm. The extrusion rate was about 360 g / min. This was guided onto the rigid plate 1 via the rubber material guide means 21.

The rigid plate 1 is placed on the rotary table 3, and four wire rods having a cross-sectional diameter of about 1 mm whose surface has been subjected to surface Teflon processing are radially provided from the central portion to the outer peripheral edge portion (on the bisector).
I placed it. Then, at the supply position of the unvulcanized rubber material 2, the unvulcanized rubber material 2 is rotated so that the rotation speed (take-off speed) corresponds to the speed at which the unvulcanized rubber material 2 is delivered. Was wound up to the vicinity of the outer peripheral edge of the rigid plate 1 to obtain a spiral molded body of unvulcanized rubber material.

The rigid plate 1 on which the unvulcanized rubber material 2 is spirally placed is taken out from the rotary table 3, and the temperature of the pressure plates 17 and 18 is about 85 ° C. and the pressure is 3 by a compression molding press.
Under a condition of -10 kgf / cm ² , pressure was applied for about 10 minutes to form a flat plate-shaped unvulcanized rubber layer 20 (FIG. 4). afterwards,
Four wires were pulled out to the outer peripheral side, and an unvulcanized rubber layer 20 having fine grooves (not shown) was formed on the rigid plate 1. Then, a single laminate having the unvulcanized rubber layer 20 having a thickness of 7.9 mm and an outer diameter of 815 mm was obtained. The same process is repeated 39 times to obtain a laminated body of 39 layers, which are laminated, and the outer surface of SS400 is 1200 mm in outer diameter and 33 m in thickness.
After arranging the flanges 30 and 31 (see FIG. 5) of m, it is mounted on a vulcanization mold (not shown) and the surface pressure is 20 to 50 kgf.
/ Cm ² , 150 ° C, heating for 10 hours for vulcanization to obtain a rubber laminate 29 for seismic isolation shown in Fig. 5.

[0034]

As is apparent from the above description,
The method for forming the unvulcanized rubber layer in the manufacturing process of the rubber laminate for seismic isolation or the like of the present invention has the following excellent effects.

According to the first aspect of the present invention, there is no debris loss caused by punching out a continuous unvulcanized rubber sheet according to the size of the product.

There is no need to prepare a punching blade depending on the size, and the cost and delivery time are improved.

Since the thickness of the unvulcanized rubber layer can be designed by designing the thickness of the string-shaped unvulcanized rubber material, a thick material can be molded as one step.

In the invention described in claim 2, since the thickness of the unvulcanized rubber material in the central portion and the thickness in the outer peripheral portion are automatically made uniform, the thickness of the obtained unvulcanized rubber layer is Becomes uniform.

In the third aspect of the present invention, since the extruded material of unvulcanized rubber easily moves on the rigid plate, the extruded materials can be brought into contact with each other and wound without a gap.

In the invention described in claim 4, in the subsequent vulcanization step, the air near the central portion and the generated gas easily flow out, and the excess rubber also easily flows out to form the coating layer. Adhesion failure and physical property failure due to gas and gas are less likely to occur.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of an apparatus used in a molding method according to an embodiment of the present invention.

FIG. 2 is a left side view showing the device of FIG. 1 in a partial cross section (cross section AA).

3 is a plan view showing the device of FIG. 1. FIG.

FIG. 4 is a front view showing the concept of press molding in the latter stage of the molding method of the present invention.

FIG. 5 is a cross-sectional view showing a seismic isolation rubber laminate as an example of the final product of the present invention.

[Explanation of symbols]

1: Rigid plate 2: Unvulcanized rubber material 3: rotary table 7: Pressing roller 9: Guide frame 11: Guide support rod 12: Extruder 13: Rubber material 15: Central disk 17: Lower pressure plate 18: Upper pressure board 20: Unvulcanized rubber layer 21: Rubber material guiding means

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI B29L 9:00 B29L 9:00 (58) Fields investigated (Int.Cl. ⁷ , DB name) B29C 43/18-43/20 , 43/34 B29C 35/00-35/04 B29D 31/00

Claims (4)

(57) [Claims] 1. A method of forming an unvulcanized rubber layer in a manufacturing process of a rubber laminate in which a circular rigid plate and a disc-shaped unvulcanized rubber layer are alternately laminated and then vulcanized, wherein the rigid plate is rotated. While unrolling, the cord-shaped unvulcanized rubber materials are laid side by side in a spiral shape from the center of the upper surface to the outer peripheral edge portion, and then the unvulcanized rubber materials laid in this spiral shape are pressed and pressed. A method for forming an unvulcanized rubber layer in a manufacturing process of a rubber laminate for seismic isolation or the like, which is a disc-shaped unvulcanized rubber layer. 2. The rotational speed of the rigid plate is such that the unvulcanized rubber material is fed at a position where the unvulcanized rubber material is fed so that the surface speed of the rigid plate is the same. The method for molding an unvulcanized rubber layer in a manufacturing process of a rubber laminated body for seismic isolation or the like according to claim 1, wherein the supply position of the rubber vulcanized rubber becomes lower as the position from the central portion of the rigid plate to the outer peripheral edge portion decreases. 3. The cross section of the unvulcanized rubber material is substantially circular, and a lubricant is sprayed on the upper surface of the rigid plate.
Alternatively, the method for forming an unvulcanized rubber layer in the manufacturing process of the rubber laminate for seismic isolation or the like according to 2 above. 4. After arranging a plurality of wires radially from the center of the upper surface of the rigid plate toward the outer peripheral edge, spirally laying an unvulcanized rubber material on the wire and pressing the wire. 4. The wire rod is pulled out to provide an air vent passage.
5. A method for forming an unvulcanized rubber layer in a manufacturing process of a rubber laminate for seismic isolation or the like according to any one of 1.