JPH11190392A - Manufacture of laminated rubber supporting body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stable vibration absorbing performance without press fitting column shaped elastically plastic metal. SOLUTION: In the case where a laminated rubber supporting body 1A provided with a laminated rubber body 4A formed by alternately laminating rubber layers 5 and intermediate steel plates 6 with each other between an upper connecting steel plate 2 and a lower connecting steel plate 3, and a lead body 7 as column shaped elastically plastic metal sealed into the laminated rubber body 4A is manufactured by a vulcanizing molding 20A; the lead body 7 is erected on a prescribed position of a lower die 23, and an intermediate die 22A is fixed to the lower die 23, the lower connecting steel plate 3 is fitted into the lead body 7 to be erected, and the rubber layer 5 and the intermediate steel plate 6 are alternately fitted to the lead body 7 on the lower connecting steel plate 3. The upper connecting steel plate 2 is fitted to the lead body 7 so as to mount on the most upper rubber layer 5, and the rubber layers 5 and the intermediate steel plates 6 are laminated with each other to a prescribed height. After laminating, the upper die 21 is fixed to the intermediate die 22A, and the laminated rubber supporting body 1A is integratedly vulcanized and molded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a laminated rubber bearing used for seismic isolation, vibration isolation or vibration isolation of buildings, precision equipment, and the like, and more particularly to a method of manufacturing a leaded rubber bearing in a laminated rubber bearing. The present invention relates to a method of manufacturing a laminated rubber bearing body that absorbs horizontal vibration energy by enclosing an elastic-plastic metal such as the above.

[0002]

2. Description of the Related Art Conventionally, a structure is provided between an upper structure and a lower structure in order to absorb vibration energy in the horizontal direction between the two structures and reduce vibration acceleration to the upper structure. An energy absorbing device (Japanese Patent Application Laid-Open No. Sho 59-62742), a laminated rubber bearing structure (Japanese Utility Model Publication No. 4-42363), and a lead-sealed laminated rubber bearing (Japanese Patent Application Laid-Open No. Hei 8-21484) have been proposed.

The basic structure of such an energy absorbing device, a laminated rubber bearing structure and a lead-filled laminated rubber bearing is such that, as shown in FIG. 7, a rubber-like elastic body 51 and a rigid material 52 are alternately laminated and molded. , A laminated rubber body 54 having a through hole 53 formed in the center thereof, and a lead plug 55 sealed in the through hole 53 of the laminated rubber body 54 (hereinafter, referred to as a “laminated rubber bearing body 50”). .).

The lead plug 55 has a stable vibration absorbing property.
In order to obtain the performance, the volume V of the lead plug 55 when no load is applied
_OAnd the volume V of the through hole 53 of the laminated rubber body 54 when no load is applied._S
And the ratio V _O/ V_SIs preferably close to 1.0.

[0005]

However, this is not the case.
Such a conventional laminated rubber bearing 50 has a lead plug
Volume 55_OAnd the penetration of the laminated rubber body 54 under no load
Volume V of hole 53_SAnd the ratio V _O/ V_SClose to 1.0
Lead plug 55 must be press-fitted with a hydraulic device
Since the lead plug 55 is not
The through-hole 53 of the rubber layer 54 may be damaged,
The lead plug 55 itself is bent as shown in
was there. Also, as shown in FIG.
The end face of 55 may be lifted or drooped.
Was.

On the other hand, if the amount of press-fitting of the lead plug 55 is reduced to avoid the above-mentioned difficulties, there is a possibility that an appropriate damping / yielding force cannot be obtained, or fatigue breakage of the lead plug 55 occurs during shear deformation. there were. In addition, when vulcanizing and molding a laminated rubber body in which a lead plug is not inserted into a through hole, FIG.
As shown in FIG. 0, by using a core 60 provided with a reverse taper T to form the through hole 53 of the laminated rubber body 54,
Although core removal after vulcanization molding can be facilitated, when vulcanizing and molding a laminated rubber body into which a lead plug is inserted into a through hole, as shown in FIG. 5
Since 5 must be filled without gaps, a large taper cannot be provided. That is, in order to obtain stable vibration absorbing performance, the through hole 53 of the laminated rubber body 54 and the lead plug 55 must be processed straight, and the clearance between the lead plug 55 and the rigid material 52 must be as close to zero as possible. .

Further, in such a laminated rubber bearing body 50, the ratio of the diameter d of the lead plug 55 to the height h is d / h ≧ 1.
/ 3, lead plug 5
It is known to those skilled in the art that a spherical heading phenomenon occurs in which the peripheral portions of the upper and lower surfaces of the upper and lower surfaces 5 are rounded. It is also known to those skilled in the art that when this spherical head phenomenon occurs, the restraint of the lead plug 55 is lost and the performance is deteriorated with respect to the design characteristics.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a method of manufacturing a laminated rubber bearing which can obtain a stable vibration absorbing performance without press-fitting a columnar elasto-plastic metal. The purpose is to provide.

[0009]

According to the present invention, there is provided a method of manufacturing a laminated rubber support according to the present invention, wherein a rubber-like elastic material and a rigid material are alternately laminated and molded, and at least one or more hollow portions are formed. In manufacturing a laminated rubber bearing body having a laminated rubber body formed with and a columnar elastoplastic metal disposed in the hollow portion of the laminated rubber body, the columnar elastoplastic metal is set up and the columnar elastoplastic metal is set up. A rubber-like elastic body and a rigid material are alternately fitted into each other and laminated to a predetermined height, and after lamination, they are integrally vulcanized.

In such a method of manufacturing a laminated rubber bearing, a rubber-like elastic body and a rigid material are alternately fitted into a columnar elastic-plastic metal, laminated to a predetermined height, and then integrally vulcanized and molded. Damage to the hollow portion of the laminated rubber body and the columnar elastoplastic metal, bending of the columnar elastoplastic metal itself, lifting of the end face of the columnar elastoplastic metal, and drooping can be eliminated. In the method for manufacturing a laminated rubber bearing according to the present invention, it is preferable that the columnar elasto-plastic metal is erected after fixing metal plates having greater rigidity than the columnar elasto-plastic metal at both ends. This allows the metal plate to receive pure shear deformation together with horizontal displacement of the entire laminated rubber bearing body. Therefore, the heading phenomenon can be prevented.

In the method for producing a laminated rubber bearing according to the present invention, it is preferable that the columnar elasto-plastic metal is installed on both ends of a metal ring having greater rigidity than the columnar elasto-plastic metal, and then erected. This allows the metal annular body to receive pure shear deformation together with horizontal displacement of the entire laminated rubber bearing body. Therefore, the heading phenomenon can be prevented.

In the method for producing a laminated rubber bearing according to the present invention, the room temperature of a columnar elastoplastic metal, a columnar elastoplastic metal having a metal plate fixed at both ends, or a columnar elastoplastic metal having a metal ring mounted at both ends is described. In addition, the height at the time of no load is 0.9 to 1 times the height of the laminated rubber body after integral vulcanization molding.
It is preferable to set it to 1 time. Thereby, even if the rubber portion of the laminated rubber body shrinks after integral vulcanization molding, the height of the columnar elastoplastic metal or the like can be matched with the height of the laminated rubber body.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing a laminated rubber bearing according to the present invention will be described below with reference to the drawings. As shown in FIG. 2, a laminated rubber bearing to which the method for manufacturing a laminated rubber bearing of the present invention is applied has a rubber layer which is a rubber-like elastic body between an upper connecting steel plate 2 and a lower connecting steel plate 3 which are rigid materials. A laminated rubber body 4 is formed by alternately laminating and molding an intermediate steel plate 5 as a rigid material, and a columnar elastic-plastic metal 7 sealed in the laminated rubber body 4.

The laminated rubber body 4 is formed in a columnar shape, and has a hollow portion 4a formed by hollowing out a central portion thereof. The columnar elastic-plastic metal 7 is sealed in the hollow portion 4a. For the rubber layer 5 of the laminated rubber body 4, natural rubber or synthetic rubber such as chloroprene rubber having excellent elasticity is used. The upper connected steel plate 2, the lower connected steel plate 3, and the intermediate steel plate 6 are usually made of a steel plate because of the adhesion to the rubber layer 5, but a nickel plate, a copper plate, a brass plate or a nickel plate, a copper plate, a brass plate is used. A coated steel plate or the like can also be used. The inner peripheral surface of the hollow portion 4a of the laminated rubber body 4 has the inner peripheral surfaces 2a, 3a, 6a of the upper connecting steel plate 2, the lower connecting steel plate 3, and the intermediate steel plate 6 exposed or slightly adhered to the rubber layer 5. Are preferred. This is the hollow part 4
This is because the rubber layer portion on the inner peripheral surface of a is effective in removing microvibration, but if the rubber layer portion is too thick, the damping force at the time of an earthquake decreases.

The columnar elastoplastic metal 7 is preferably pure lead, which is rich in extensibility and can be easily plastically deformed. However, a lead alloy may be used as long as it has characteristics such as pure lead (hereinafter referred to as "lead body 7").
That. ). Such a lead body 7 is formed in a shape having a cross section that can be inserted without being pressed into the hollow portion 4a. Specifically, the clearance between the hollow portion 4a of the laminated rubber body 4 and the lead body 7 is 0.1 mm to 2 mm on one side, preferably 0.1 mm to 2 mm.
It is good to make it 2 mm to 0.5 mm. This is to cope with the fact that the lead 7 thermally expands by about 0.3 to 1.5 mm during vulcanization molding. The clearance varies within the above range depending on the vulcanization temperature during vulcanization molding and the outer diameter of the lead 7.

The upper connecting steel plate 2 and the lower connecting steel plate 3 of the laminated rubber body 4 in which such a lead body 7 is sealed are respectively provided with an upper mounting plate 11 and a lower mounting plate 12 by connecting bolts 1.
3 fixed. The upper connecting steel plate 2 and the upper mounting plate 11 may be integrally formed with the lower connecting steel plate 3 and the lower mounting plate 12, respectively. In this case, the lead body 7 is sealed in the integrally formed one. Are formed.

A method of manufacturing the laminated rubber bearing 1 thus configured will be described. Note that the upper mounting plate 11 and the lower mounting plate 12 are manufactured by the manufacturing method of the present invention.
Is a state in which the laminated rubber support 1 is not fixed. Since the laminated rubber support 1 is molded by a vulcanizing press, a mold for vulcanization molding is used. This vulcanization mold is shown in FIG.
As shown in the figure, for vulcanization molding, it is composed of an upper mold 21, a middle mold 22 and a lower mold 23, and has a middle mold 22A for a laminated rubber bearing 1A in which the outer peripheral edge of each laminated intermediate steel plate 6 is exposed. A vulcanization mold 20B (FIG. 1B) having a mold 20A (FIG. 1A) and a middle mold 22B for a laminated rubber bearing 1B covering the outer peripheral edge of each of the laminated intermediate steel plates 6. ).

Hereinafter, a method of manufacturing the laminated rubber bearing 1A using the vulcanization mold 20A will be described with reference to the flowchart of FIG. First, the lead body 7 is erected at a predetermined position of the lower die 23, and the middle die 22A is fixed to the lower die 23 (steps 101 and 102). In order to erect the lead member 7, grooves, projections, etc. (not shown) provided in the lower mold 23 are provided.
It is performed by fixing with. The lead 7 is inserted into a lower connecting steel plate 3 to be described later, and then the lower connecting steel plate 3 is inserted.
May be erected using the hollow portion of the as a guide.

Next, the lower connecting steel plate 3 is inserted into the standing lead body 7 (step 103).
The rubber layer 5 and the intermediate steel plate 6 are alternately fitted into the lead body 7 (steps 104, 105, and 106), and the upper connected steel plate 2 is further placed on the uppermost rubber layer 5. Is inserted into the lead body 7 and laminated to a predetermined height (step 1).
07). In addition, the rubber layer 5 and the intermediate steel plate 6 may be alternately laminated, and the upper connection steel plate 2 may be laminated on the laminate, and then the middle mold 22A may be fixed to the lower mold 23.

After the upper connecting steel plate 2 is inserted into the lead body 7, the upper die 21 is fixed to the middle die 22A (step 108). Note that the height of the lead body 7 at normal temperature and at no load is
0.9 to 1 of the height of the laminated rubber body 4A after integral vulcanization molding.
It is preferably set to 1 time, preferably 0.95 to 1.05 times. Thereby, even if the rubber portion of the laminated rubber body 4 shrinks after integral vulcanization molding, the height of the lead body 7 and the laminated rubber body 4
A can match the height of A.
The lead body 7 can be filled in the hollow portion 4a of A without a gap. Usually, the height of the lead body 7 at normal temperature and no load is set to be lower than the height of the laminated rubber body 4A at normal temperature and no load, and as shown in FIG. By providing the convex portion 21a with a plate or
It is possible to cope with shrinkage of the rubber portion of the laminated rubber body 4A.

The vulcanizing mold 20A, on which the laminated rubber bearing 1A is set, is inserted into a vulcanizing press having upper and lower hot plates using steam or the like as a heat source to start vulcanizing molding. (Step 109). The molding conditions for this vulcanization molding are usually as follows: a heating temperature of 80 to 170 ° C. and a pressing force of 80 to 170 ° C.
It is set to 200 kgf / cm ² . Note that the heat source may be incorporated into the middle mold 22A for vulcanization molding.

When the vulcanization molding is started, the rubber layer 5 of the laminated rubber body 4A is vulcanized by heat and pressure, and at the same time, an adhesion reaction occurs, and the integral vulcanization molding of the laminated rubber support 1A is completed. The vulcanization time varies depending on the size of the rubber layer 5 and the properties of the rubber, but is usually about 3 to 20 hours. After integral vulcanization molding, the laminated rubber support 1A is
A, and the upper connecting steel plate 2 and the lower connecting steel plate 3 of the laminated rubber bearing 1A are attached to the upper mounting plate 11 respectively.
Then, the lower mounting plate 12 is fixed with the connecting bolt 13 (steps 110 and 111).

The volume V _O of the lead body 7 after integrally vulcanization molding
And the ratio V _O / to the volume V _S of the hollow portion 4a of the laminated rubber body 4A.
In order to adjust V _S , a shim plate (not shown) may be inserted into the hollow portion 4a. As the material of the shim plate, a steel plate having higher rigidity than pure lead or lead may be used, or a hard rubber-like elastic material may be used when the thickness is small. Further, the number of shim plates is not limited to one, and a plurality of shim plates may be inserted according to the adjustment of the ratio V _O / V _S described above.

Next, the seismic isolation effect of the laminated rubber bearing 1A manufactured by the manufacturing method of the present invention will be described. Lead body 7
When a horizontal force is applied to the laminated rubber body 4 </ b> A in which a small vibration, a small earthquake, or a strong wind is applied, the shearing deformation in the horizontal direction is suppressed by resistance due to the initial rigidity of the lead body 7. Displacement can be suppressed. Also, when a horizontal force is applied by a large earthquake,
Although the laminated rubber body 4A undergoes large shear deformation (relative displacement) in the horizontal direction, it absorbs the energy of the earthquake by the soft horizontal rigidity of the laminated rubber body 4A and the extensible plastic deformation of the lead body 7, so that the upper structure (Not shown), and the relative acceleration can be suppressed.

On the other hand, the intermediate steel sheet 6 is
When the integrated vulcanization molding of the laminated rubber bearing body 1B covering the outer peripheral edge of the lead member 7 is performed, the rubber layer 5 and the intermediate steel plate 6 are alternately fitted onto the lead member 7 on the lower connecting steel plate 3 while maintaining the predetermined height. After laminating, the protective rubber layer 14 is attached later. As a result, the rubber layers 5 and the intermediate steel plates 6 are alternately laminated, and the outer peripheral edge of each intermediate steel plate 6 is covered with the protective rubber layer 14, and the laminated rubber body 4B is sealed in the laminated rubber body 4B. The lead body 7 can be integrally vulcanized and molded.

As described above, the rubber-like elastic body and the rigid material taking into account the thermal shrinkage are alternately fitted into the columnar elasto-plastic metal taking into account the thermal expansion, laminated to a predetermined height, and then added integrally. Since the vulcanization molding is performed, damage to the hollow portion of the laminated rubber body and the columnar elastoplastic metal, bending of the columnar elastoplastic metal itself, lifting of the end surface of the columnar elastoplastic metal, and drooping can be eliminated.

In the embodiment of the present invention, the lead body 7 is used as the columnar elasto-plastic metal to be erected on the lower mold 23. However, the present invention is not limited to this. As shown in FIG. 7
Molded body 10 in which metal plates 8A, 8B having greater rigidity than the lead body 7 are fixed to both ends 7a, 7b of the lead body 7 respectively.
(FIG. 5 (a)), and a lead molded body 20 (FIG. 5 (b)) in which metal annular bodies 15A and 15B are mounted on the peripheral edges 7c and 7d of both ends 7a and 7b of the lead body 7, respectively. May be provided. In order to erect the lead molded bodies 10 and 20, the metal plates 8A and 8B and the metal annular bodies 15A and 15B are fixed to both ends of the lead molded bodies 10 and 20, for example, as shown in FIG. It is preferable that the lower mold 23 is fixed to the lower mold 23 with screws or pins 24.

As the steel material of the metal plates 8A and 8B and the metal annular bodies 15A and 15B, rolled steel materials for general structures and carbon steel materials for machine structures are preferable. Further, in order to fix or mount the metal plates 8A and 8B and the metal annular bodies 15A and 15B on the lead body 7, it is preferable to apply homogen processing. Here, the homogen processing means that the surface of the iron is pickled, and then a fusing liquid is applied thereon or a lead-tin alloy is plated thereon to form a lead body 7 and metal plates 8A and 8B.
Alternatively, it refers to a process of fusing the metal annular bodies 15A and 15B. The fixing or mounting of the lead body 7 and the metal plates 8A and 8B or the metal annular bodies 15A and 15B is not limited to the homogen processing, but may be any welding or bonding as long as fixing or mounting can be performed. Alternatively, non-adhesive fitting may be used.

Such lead moldings 10 and 20 are made of metal plates 8A and 8B located at both ends 7a and 7b of each lead 7.
And the metal annular bodies 15A and 15B are located at the upper connecting steel plate 2 and the lower connecting steel plate 3, so that the pure shear deformation characteristic of the lead body 7 is reduced by the restraining action of the upper connecting steel plate 2 and the lower connecting steel plate 3. Will be able to maintain. Thereby, the pure shear deformation together with the horizontal displacement of the entire laminated rubber body 4 is caused by the metal plates 8A, 8B and the metal annular bodies 15A,
Since the ball can be received at 15B, the heading phenomenon can be prevented.

In the same manner as the lead body 7 described above, the height of the lead molded bodies 10 and 20 at room temperature and under no load is 0.9 to 0.9 mm of the height of the laminated rubber body 4 after integrally vulcanization molding. 1.1
It is preferably set to a factor of 0.95, preferably 0.95 to 1.05. As a result, the laminated rubber body 4 after integral vulcanization molding is formed.
Even if the rubber part of the rubber body shrinks, the height of the lead molded bodies 10 and 20 and the height of the laminated rubber body 4 can be matched, so that the lead molded body 10 or 20 is inserted into the hollow portion 4a of the laminated rubber body 4. Without filling.

Further, in the embodiment of the present invention, the columnar elasto-plastic metal is disposed on the laminated rubber body having the hollow portion hollowed out at the center portion. However, the present invention is not limited to this. A columnar elastic-plastic metal may be arranged on the laminated rubber body thus formed.

[0032]

As described above, according to the method for manufacturing a laminated rubber bearing of the present invention, the laminated rubber bearing can be formed without press-fitting the columnar elastic-plastic metal into the hollow portion of the laminated rubber body. Therefore, damage to the columnar elastic-plastic metal and the laminated rubber body can be prevented. Therefore, stable seismic isolation performance can be obtained.

Further, by fixing a metal plate to both ends of the columnar elasto-plastic metal or arranging a metal ring, it is possible to prevent a ball-heading phenomenon. It is possible to prevent fatigue destruction and early destruction of the laminated rubber body.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing one embodiment of a method for manufacturing a laminated rubber bearing according to the present invention. FIG. 1 (a) shows a middle size for a laminated rubber bearing in which the outer peripheral edge of each laminated intermediate steel plate is exposed. FIG. 4B is an explanatory view of a vulcanization mold having a middle mold for a laminated rubber bearing body covering the outer peripheral edge of each of the laminated intermediate steel plates.

FIG. 2 is a view showing a laminated rubber bearing manufactured by the method for manufacturing a laminated rubber bearing of the present invention, wherein (a) is a top view,
(B) is a side sectional view.

FIG. 3 is a flowchart of a method for manufacturing a laminated rubber bearing according to the present invention.

FIG. 4 is an explanatory view showing an upper mold in consideration of rubber shrinkage of a laminated rubber body after vulcanization molding.

FIG. 5 is a view showing another embodiment of a laminated rubber bearing manufactured by the method for manufacturing a laminated rubber bearing of the present invention;
(A) is a side sectional view of a laminated rubber bearing body using a lead molded body in which a metal plate is fixed to a lead body, and (b) is a laminated body using a lead molded body in which a metal ring is mounted on a lead body. FIG. 4 is a side sectional view of a rubber bearing.

FIG. 6 is an explanatory view of a method of fixing a lead molded body applied to the method of manufacturing a laminated rubber bearing shown in FIG. 5 to a lower mold.

FIG. 7 is an explanatory view showing a laminated rubber bearing manufactured by a conventional method for manufacturing a laminated rubber bearing.

FIG. 8 is an explanatory view showing a method for manufacturing a conventional laminated rubber bearing.

FIG. 9 is an explanatory view showing a method for manufacturing a conventional laminated rubber bearing.

FIG. 10 is an explanatory view showing a method of manufacturing a laminated rubber body without inserting a lead plug into a through hole.

[Explanation of symbols]

 1, 1A, 1B ····· Laminated rubber bearing body 2 ································ Lower connecting steel plate (with a stiff material) Laminated rubber body 4a ... hollow part 5 ... rubber layer (rubber-like elastic body) 6 ... intermediate steel plate (rigid material) 7 ... lead body (column-shaped elasto-plastic metal) 7a, 7b... Both ends of lead body 8A, 8B... Metal plate 15A, 15B.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisayuki Yajima 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Showa Electric Wire & Cable Co., Ltd. (72) Yoshitaka Muramatsu 2, Ei Oda Kawasaki-ku, Kawasaki City, Kanagawa Prefecture 1-1-1, Showa Electric Wire & Cable Co., Ltd. (72) Inventor Kazuto Onodera 2-1-1, Sakae Oda, Kawasaki-ku, Kawasaki-city, Kanagawa Prefecture In-Showa Electric Wire & Cable Co., Ltd. (72) Shigeo Fukuda Kawasaki-shi, Kanagawa Showa Electric Wire & Cable Co., Ltd. 2-1-1 Oda Sakae, Kawasaki-ku

Claims (4)

[Claims] 1. A laminated rubber body in which at least one hollow portion is formed by alternately laminating and molding a rubber-like elastic body and a rigid material, and a columnar bullet disposed in the hollow portion of the laminated rubber body. In manufacturing a laminated rubber bearing body including a plastic metal, the columnar elastoplastic metal is erected and the rubbery elastic body and the rigid material are alternately fitted into the columnar elastoplastic metal to a predetermined height. A method for producing a laminated rubber bearing, comprising laminating, laminating and then integrally vulcanizing. 2. The laminated rubber bearing according to claim 1, wherein the column-shaped elasto-plastic metal is erected after fixing metal plates having greater rigidity than the column-shaped elasto-plastic metal at both ends. Method. 3. The laminated rubber bearing according to claim 1, wherein said column-shaped elasto-plastic metal is provided on both ends thereof with a metal ring having greater rigidity than said column-shaped elasto-plastic metal and then erected. Manufacturing method. 4. The columnar elasto-plastic metal having the metal plate fixed at both ends thereof or the column-shaped elasto-plastic metal having the metal ring mounted at both ends thereof at room temperature and at no load. 4. The method for producing a laminated rubber bearing according to claim 1, wherein the height is set to 0.9 to 1.1 times the height of the laminated rubber body after integrally vulcanization molding.