JP2001121543A - Dielectric heating mold for supporting rubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject dielectric heating mold relatively low in cost, capable of withstanding long-term use and almost uniformly heating all of elastomer plates. SOLUTION: A mold is used when a laminate S which is formed by alternately laminating a plurality of square elastomer plates 5 and a plurality of conductive metal plates 6 is integrated by dielectric heating in such a mode that pressure is applied to the laminate in a laminating direction at least temporarily and equipped with a non-conductive frame mold 3 formed by combining a plurality of separate flat plates in a square shape and surrounding the laminating surface of the laminate S and upper and lower conductive molds 1, 2 provided to the upper and lower ends of the frame mold 3 to hold a frame shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric heating mold for producing a rubber bearing having a rectangular shape in plan view. Note that the rubber bearing is a rubber-metal laminate installed between the bridge girder and the pier, and has a capability of protecting the pier from earthquakes in addition to the ability to follow the extension / shrinkage of the bridge girder.

[0002]

2. Description of the Related Art A rubber bearing is basically manufactured by alternately stacking and storing steel plates and elastomer plates in a mold, and pressing the mold with a press while heating the mold with a hot platen. ing. Specifically, it is heated to the rubber flow temperature, the laminated rubber is molded by pressing pressure, the vertical thermal expansion of the laminated rubber is suppressed, and the product dimensions are secured. It is manufactured by a process of performing vulcanization bonding between a steel plate and rubber.

[0003] However, since the elastomer plate constituting the rubber bearing has a low thermal conductivity, the rate of temperature rise is different between a portion close to the heat source and a portion away from the heat source. There has been a problem that physical properties of the laminated rubber (vertical elastic modulus, shear elastic modulus, adhesive strength between the elastomer plate and the steel plate, etc.) are varied.

[0004] Therefore, it is conceivable that a laminated body formed by alternately laminating a plurality of elastomer plates and steel plates is accommodated in a molding die, and the laminated body is integrated by dielectric heating to produce a rubber bearing. At present, no dielectric heating mold for producing such rubber bearings is found.

[0005] This type of dielectric heating mold is relatively inexpensive and can withstand long-term use.
An essential condition is that all the elastomer plates are heated substantially uniformly.

[0006]

Therefore, according to the present invention, a dielectric heating mold for rubber bearings which is relatively inexpensive, can withstand long-term use, and in which all elastomer plates are heated substantially uniformly. The task is to provide

[0007]

Means for Solving the Problems (Invention of Claim 1)
The dielectric heat molding die for rubber bearing according to the present invention is characterized in that a laminate formed by alternately laminating a plurality of rectangular elastomer plates and a conductive metal plate is integrated by dielectric heating in such a manner that pressure is applied in the laminating direction for at least one time. A non-conductive frame that is formed by combining a plurality of separate flat plates into a square shape and surrounds the stacked surface of the stacked body,
A conductive upper and lower mold for maintaining the upper and lower frame shapes of the frame mold. (Invention according to claim 2) The dielectric heating mold for rubber bearing according to the present invention relates to the invention according to claim 1, wherein a plurality of flat plates are formed by fastening members so that the frame molds independently maintain the frame shape. Are connected by (Invention according to claim 3) The dielectric heating mold for rubber bearing according to the present invention relates to the invention according to claim 1 or 2, wherein the flat plate constituting the frame mold is formed by applying a resin to a cloth made of a fibrous reinforcing material. A plurality of impregnated materials are integrated by heating and pressing in a state of being laminated. (Invention according to claim 4) The dielectric heating mold for rubber bearing according to the present invention relates to the invention according to claim 3, wherein the resin constituting the flat plate is an epoxy resin or an ester resin. (Invention according to claim 5) The dielectric heating mold for rubber bearing according to the present invention relates to the invention according to any one of claims 1 to 4, wherein the flat plate has a dielectric loss coefficient equal to the dielectric loss coefficient of the elastomer plate. Less than or equal to the value. According to a sixth aspect of the present invention, there is provided a dielectric heating mold for rubber bearing according to the present invention, wherein a laminate formed by alternately laminating a plurality of rectangular elastomer plates and a conductive metal plate is pressed at least temporarily in a laminating direction. And a non-conductive frame having a rectangular inner peripheral surface manufactured as one piece, and upper and lower frame shapes of the frame. And a conductive upper and lower mold for maintaining the shape. (Invention according to claim 7) The dielectric heating mold for rubber bearing according to the present invention relates to the invention according to claim 6, wherein the frame mold is
It is formed by laminating resin-impregnated cloth in multiple stages by a hand lay-up method. (Invention according to claim 8) The dielectric heating mold for rubber bearing according to the present invention relates to the invention according to claim 7, wherein the resin forming the frame is an epoxy resin or an ester resin. (Invention according to claim 9) The dielectric heating mold for rubber bearing according to the present invention relates to the invention according to claim 6, wherein the frame mold is
It is obtained by curing a liquid rubber or a thermoplastic material mixed with a fibrous reinforcing material. (Invention according to claim 10) The dielectric heating mold for rubber bearing according to the present invention relates to the invention according to claim 1 or 6, wherein the upper and lower dies have grooves corresponding to the upper and lower frame shapes of the frame. The upper and lower ends of the frame mold are fitted into grooves of the upper and lower molds. (Invention according to claim 11) The dielectric heat molding die for rubber bearing according to the present invention relates to the invention according to claim 1 or 6, which is a molding die intended for a laminated body having a through hole in a laminating direction. And a non-conductive core passing through the through-hole of the laminate. (Invention according to claim 12) The dielectric heat molding die for rubber bearing according to the present invention relates to the invention according to claim 11, wherein the resin constituting the core is an epoxy resin or an ester resin. (Invention according to claim 13) The dielectric heating mold for rubber bearing according to the present invention relates to the invention according to claim 11 or 12, wherein the core has a dielectric loss coefficient equal to or less than the dielectric loss coefficient of the elastomer plate. is there.

The function of the dielectric heating mold for rubber bearing in the above-mentioned invention will be described in the following embodiments of the invention.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings showing embodiments.

FIG. 1 shows an apparatus for manufacturing a rubber bearing from a laminate S having steel flange plates 7 on the upper and lower sides by using a dielectric heating method.

This manufacturing apparatus, as shown in FIG. 2, places a laminate S in an inner space K of a dielectric heating mold SK formed by upper and lower dies 1, 2, a rectangular frame mold 3 and a core 4. The upper and lower dies 1 and 2 are pressed by a press while being housed and applied between the upper and lower dies 1 and 2 via parallel electrode plates P1 and P2 while applying a high frequency voltage generated by the high frequency oscillator 9 as shown in FIG. Is applied to the stacked body S by applying pressure in a direction in which it approaches.

Hereinafter, the main components and the like employed in the rubber bearing manufacturing apparatus will be described in detail. [About the laminated body S] As shown in FIG.
A square elastomer plate 5 having holes 50 and a square steel plate 6 having holes 60 (corresponding to the conductive metal plate described in the section of the means for solving the problem) are alternately laminated, A flange plate 7 having holes 70 above and below it is arranged. Note that an adhesive layer (for example, a combination of a phenol-based polymer and a chlorine-based polymer) may be interposed between the elastomer plate 5 and the steel plate 6 and between the elastomer plate 5 and the flange plate 7. preferable. Also,
As the elastomer plate 5, natural rubber and synthetic rubber are used, but instead of the elastomer plate 5, a diene-based elastomer, a non-diene-based elastomer, a thermoplastic elastomer,
Liquid rubber and other moldable polymers can be used. [Regarding High Frequency Oscillator 9] The high frequency oscillator 9 is constituted by a known circuit. Note that the frequency used for high-frequency dielectric heating uses 13.6 MHz,
It can be used within the range of 0 MHz, preferably 4 MHz.
It is in the range of ８０80 MHz. [Regarding Upper Die 1 and Lower Die 2] Both the upper die 1 and the lower die 2 are made of steel.

The upper mold 1 is formed of a rectangular flat plate larger than the frame mold 3 assembled as shown in FIGS.
A circular hole 11 into which the core 4 is fitted is provided, and a rectangular groove 10 into which the upper end of the assembled frame mold 3 is fitted is formed.

The lower mold 2 is formed of a rectangular flat plate larger than the frame mold 3 assembled as shown in FIGS.
A circular hole 21 into which the core 4 is fitted is provided, and a rectangular groove 20 into which the lower end of the assembled frame mold 3 is fitted is formed. In addition, the groove 20 may be formed by directly cutting the lower die 2 or by attaching another member with a bolt or the like. [About the frame mold 3 and the core 4] As a material of the frame mold 3 and the core 4, the dielectric loss coefficient (dielectric constant × dielectric tangent) is equal to or less than the dielectric loss of the elastomer plate 5 [measurement method: JIS K6
911, test conditions: temperature 20 ± 2 ° C, relative humidity 65 ± 5
%, Measurement frequency: 1 MHz], and a composite material such as an epoxy resin, an ester resin, and respective glass fibers is used. In addition, frame type 3
If the material of the core 4 is set to be equal to or less than the value of the dielectric loss coefficient of the elastomer plate 5 as described above, the internal heat generation of the frame mold 3 and the core 4 becomes far greater than that of the elastomer plate 5 when the material becomes larger. This is because the core 4 and its surroundings locally rise in temperature, which makes it impossible to uniformly heat the elastomer plate 5.

As shown in FIGS. 2 and 3, the frame mold 3 is formed by combining four separate flat plates 30 in a square shape, and each flat plate 30 has a rubber punch penetrating in the plate thickness direction. Equal holes (not shown) are formed. The flat plate 30 is made of glass in consideration of high-frequency insulation properties, compressive strength characteristics, compressive creep characteristics, heat resistance, water absorption, dimensional stability, dimensional accuracy, large size compatibility, cost, and the like (see Table 1). A cloth is impregnated with a heat-resistant epoxy resin or an ester resin, and is heated and pressed in a state of being laminated in a large number to form a plate, which is machined. When the fibrous reinforcing material such as glass fiber is exposed on the machined surface, the exposed fiber surface can be coated with a resin by coating the resin material from above.

Here, in a state where the above-mentioned four flat plates 30 are fitted into the grooves 10 and 20 of the upper and lower dies 1 and 2 to assemble the forming die, as shown in FIGS. The end surface and the bottom surfaces of the grooves 10 and 20 are almost in contact with each other. Therefore, the frame mold 3 formed by the four flat plates 30 exhibits the same function as the frame mold formed by one member, and even when the pressure from the press machine at the time of molding is reduced, There is no adverse effect on the dimension in the height direction.

The core 4 is an epoxy resin (or ester resin) glass fiber composite, and uses a laminated tube manufactured by a filament winding method.

[0018]

[Table 1]

[ About Parallel Electrode Plates P1 and P2] Parallel Electrode Plate
As shown in FIG. 1, P1 and P2 are made of steel plates having a slightly larger area than the upper and lower dies 1 and 2, and are provided with heating means (not shown) so as to function as a hot plate. As the heating means, for example, it is possible to adopt a configuration in which a heated fluid such as the above or oil flows in the parallel electrode plates P1 and P2, respectively, or a configuration in which a heating wire is embedded in the parallel electrode plates P1 and P2. it can. Here, the reason why the heating means is provided is to prevent heat radiation from the upper and lower dies 1 and 2 so that a temperature difference between the outside and the inside of the laminated body S cannot be caused. [Functions of this dielectric heating device] As shown in FIG. 1, the laminate S is positioned between the parallel electrode plates P1 and P2, and the high frequency voltage generated by the high frequency oscillator 9 is applied to the parallel electrode plates P1 and P2. When they are added to each other, the steel plates 6 laminated at substantially equal intervals function as intermediate electrode plates, and all the elastomer plates 5 are heated simultaneously regardless of the inner and outer portions, and provided on the parallel electrode plates P1 and P2. In addition to the function of the heating means, the laminate S is heated almost uniformly to the vulcanization temperature in a short time. Further, by stopping the oscillator 9, the object to be heated can be controlled at an arbitrary temperature without overheating, and this state can be maintained for a long time by supplementing the heat with external heating. That is, according to this method, the rubber bearing can be completed much earlier than the conventional method. [About the press machine] As shown in FIG.
A base 80 and a hydraulic cylinder 81 provided above the base 80
And a pressing plate 82 attached to the output shaft end of the hydraulic cylinder 81, and a rod-shaped pressing portion 83 made of a non-conductive member and fixed to the pressing plate 82 by hanging. In this embodiment, the above-described parallel electrode plate P1 is attached to the lower end of the rod-shaped pressing portion 83, and the parallel electrode plate P2 is attached to the upper surface of the base 80. [Other Embodiments] Four flat plates may be connected by a fastening member so that the frame mold independently maintains the frame shape. In the above embodiment, the frame 3 is formed by combining the four flat plates 30 into a square shape, but the non-conductive frame mold 3 having a rectangular inner peripheral surface manufactured integrally is adopted. You may. The frame mold 3 can be formed by forming a wooden mold having an arbitrary shape according to a rubber bearing, and using the wooden mold to bond an epoxy resin or an ester resin impregnated cloth in multiple stages by a hand lay-up method. it can. In addition, the frame mold may be formed by filling a liquid rubber or a thermoplastic material mixed with a fibrous reinforcing material into a mold having an arbitrary shape corresponding to a rubber bearing and curing the same. In the above mold, the core 4 may not be provided.

[0020]

The present invention has the following effects since it has the above-described configuration.

As is apparent from the description of the embodiments of the present invention, dielectric thermoforming for rubber bearings, which is relatively inexpensive, can withstand long-term use, and in which all elastomer plates are heated substantially uniformly. The mold could be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an apparatus for producing a laminated rubber using a dielectric heating mold according to an embodiment of the present invention.

FIG. 2 is an explanatory view of the dielectric heating mold and a laminate housed in an internal space of the mold.

FIG. 3 is an external perspective view of the dielectric heating mold.

[Explanation of symbols]

 SK Dielectric heating mold S Laminated body 1 Upper mold 2 Lower mold 3 Frame mold 4 Core 10 Groove 20 Groove 30 Flat plate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norio Minami 172 Ikezawa-cho, Yamatokoriyama-shi, Nara Prefecture Nita Factory F-term (reference) 4F202 AA45 AC03 AD03 AD08 AE07 AG03 AJ04 AJ09 AK10 CA09 CB01 CB12 CB20 CN01 CN19 CQ03 4F204 AA45 AC03 AD03 AD08 AE07 AG03 AJ04 AJ09 AK10 FA01 FB01 FB12 FN11 FN15 FQ15

Claims (13)

[Claims] 1. A mold used when a laminate formed by alternately laminating a plurality of rectangular elastomer plates and conductive metal plates is integrated by dielectric heating by applying pressure in a lamination direction at least for a period of time. A non-conductive frame that is formed by combining a plurality of separate flat plates into a rectangular shape and surrounds the lamination surface of the laminate, and a conductive shape that retains the upper and lower frame shapes of the frame. A dielectric heat molding die for rubber bearings, comprising: an upper die and a lower die. 2. The dielectric heat molding die for rubber bearing according to claim 1, wherein a plurality of flat plates are joined by a fastening member so that the frame die independently maintains the frame shape. 3. The flat plate constituting the frame die is characterized in that a plurality of cloths made of a fibrous reinforcing material impregnated with a resin are integrated by heating and pressing in a laminated state. A dielectric heat molding die for rubber bearing according to claim 1 or 2. 4. The dielectric heat molding die for rubber bearing according to claim 3, wherein the resin constituting the flat plate is an epoxy resin or an ester resin. 5. The dielectric heating mold according to claim 1, wherein the flat plate has a dielectric loss coefficient equal to or less than a dielectric loss coefficient of the elastomer plate. 6. A mold used when a laminate formed by alternately laminating a plurality of square-shaped elastomer plates and conductive metal plates is integrated by dielectric heating by applying a pressure in a laminating direction for at least one time. It is characterized by comprising a non-conductive frame mold having a rectangular inner peripheral surface manufactured integrally, and conductive upper and lower molds for maintaining the upper and lower frame shapes of the frame shape. Dielectric heating mold for rubber bearings. 7. The dielectric heat molding die for rubber bearing according to claim 6, wherein the frame die is formed by laminating a resin impregnated cloth in multiple stages by a hand lay-up method. 8. The dielectric heat molding die for rubber bearing according to claim 7, wherein the resin constituting the frame die is an epoxy resin or an ester resin. 9. The dielectric heat molding die for rubber bearing according to claim 6, wherein the frame die is formed by curing a liquid rubber or a thermoplastic material mixed with a fibrous reinforcing material. 10. The upper and lower dies are formed with grooves corresponding to the frame shapes of the upper and lower ends of the frame, and the upper and lower ends of the frame are fitted in the grooves of the upper and lower dies. 7. The dielectric heat molding die for rubber bearing according to claim 1, wherein: 11. A mold intended for a laminated body having a through hole in a laminating direction, comprising a non-conductive core passing through the through hole of the laminated body. 1
Or a dielectric heating mold for rubber bearing as described in any one of [6] to [6]. 12. The dielectric heating mold for rubber bearing according to claim 11, wherein the resin constituting the core is an epoxy resin or an ester resin. 13. The medium core, wherein a dielectric loss coefficient is equal to or less than a value of a dielectric loss coefficient of the elastomer plate.
13. A dielectric heating mold for rubber bearing according to 11 or 12.