JP5561851B2 - Method for joining rubber molded bodies and method for producing annular rubber gasket using the same - Google Patents

Description

  The present invention requires a large molding device if it is to be formed integrally by molding, such as a large rubber gasket used for sealing parts such as large engine covers, large battery cases, and industrial plant equipment. The present invention relates to a method for joining rubber moldings preferably applied to the production of gaskets and a method for producing rubber gaskets using this joining method.

  When a large rubber gasket having a large diameter as described above is manufactured by integral molding, a large molding apparatus is required, and a large capital investment is required, and the manufacturing efficiency is not high. In particular, when the product specifications are different and the sizes are various, it is necessary to prepare a molding apparatus (die press) corresponding to each. Therefore, when molding such a large rubber gasket, a so-called feed vulcanization method is adopted. In this case, since the joint portion is limited to unvulcanized rubber, it is already vulcanized and molded. In addition, it is not applicable to the joining of rubber parts, and a dedicated press device is required, which again requires a large capital investment.

  In Patent Document 1, in order to form an endless body such as a conveyor belt and a rubber crawler, the adhesive rubber is vulcanized in a state where the adhesive rubber is sandwiched between both ends of the belt-like (string-like) vulcanized rubber. A method is described in which both ends are bonded together. Further, in Patent Document 2, a rubber gasket part is bonded by vulcanizing the unvulcanized rubber sheet after sandwiching an unvulcanized rubber sheet between a plurality of rubber gasket parts, A method of manufacturing an annular gasket is described. Furthermore, in Patent Document 3, the rubber gaskets for bonding in the sinking box are abutted through an unvulcanized rubber sheet, inserted into a mold (mold), the mold is heated, and the butt portion is not yet fitted. A method is described in which vulcanized rubber is press-fitted and vulcanized and integrated to join rubber gaskets for bonding in a sinking box. Further, in Patent Document 4, both end portions of a pair of rubber weather strips are brought into contact with each other in a mold, an unvulcanized rubber sheet is interposed between opposing end surfaces of both end portions, and vulcanization molding is performed. The joining method of the sealing material terminal part which joins both terminal parts is described.

JP-A-8-176314 JP-A-9-85826 JP-A-9-13407 JP 2002-36370 A

  By the way, the technique disclosed in Patent Document 1 is not vulcanized and molded so that the adhesive rubber forms part of a conveyor belt, a rubber crawler, or the like. Further, the technique disclosed in Patent Document 2 is not vulcanized and molded so that the adhesive rubber sheet forms a part of the annular gasket for the submerged box joint. Furthermore, the technique disclosed in Patent Document 3 is to join the unsealed rubber gaskets to each other by press-fitting unvulcanized rubber into the butt portion in the mold and vulcanizing and integrating them. In this case, when the abutting portions are arranged with a gap in the mold and an unvulcanized rubber is press-fitted within the gap, an accurate positional relationship with each other cannot be determined. Therefore, in the case of manufacturing one annular gasket by sequentially repeating this joining to a plurality of rubber gasket portions, it is difficult to obtain an annular rubber gasket with high dimensional accuracy, and the technical idea disclosed in Patent Document 3 is It could not be directly applied to the production of such an annular rubber gasket. Furthermore, also in the technique disclosed in Patent Document 4, both ends of a pair of rubber weather strips are arranged at intervals in a mold, and unvulcanized rubber is press-fitted into this interval to vulcanize molding. However, if this is repeated to obtain a series of annular weather strips, the exact positional relationship between the two end portions cannot be determined when they are placed in the mold. Therefore, there is a concern that dimensional accuracy may vary in the obtained annular weather strip.

  The present invention has been made in view of the above circumstances, and a method for joining a rubber molded body capable of joining rubber molded bodies with a desired interval with high accuracy, and a large-scale apparatus by using this joining method. An annular rubber gasket with high dimensional accuracy can be efficiently manufactured without the need for an annular rubber gasket that can also be used to manufacture annular rubber gaskets with different product specifications and various sizes. It aims at providing the manufacturing method of a rubber gasket.

A method for joining rubber molded bodies as a first invention is a method for joining rubber molded bodies, in which a plurality of rubber molded bodies that are formed in advance by vulcanization molding of rubber and constitute part of an annular body are joined. via positioning means for positioning to face with a predetermined interval bonding target portion to a Jo Tokoro mold in the rubber moldings of interest, placing the rubber moldings in the mold, the distance And the mold is filled with unvulcanized rubber, and the unvulcanized rubber is vulcanized and molded to join the parts to be joined together.

  In the rubber molded body joining method of the present invention, the unvulcanized rubber is loaded into the cavity by injecting the unvulcanized rubber into the cavity after the mold is clamped. The vulcanized molding of the unvulcanized rubber may be performed in parallel with the injection. Alternatively, the unvulcanized rubber is loaded into the cavity by placing the unvulcanized rubber in the cavity before the mold is clamped, and in parallel with the mold clamping, the unvulcanized rubber is loaded. Vulcanization molding of vulcanized rubber may be performed.

Further, in the rubber molded body joining method of the present invention, the positioning means includes a concave portion or a convex portion formed on both sides or one side in the width direction of the rubber molded body and a convex portion or a concave portion formed on the mold. It can be configured by a mutual fitting relationship. Furthermore, it is desirable that the cross-sectional shape of the cavity be the same shape as the shape of the end face part to be joined at the joining target portion of the rubber molded body.

  According to a second aspect of the present invention, there is provided a method for producing an annular rubber gasket, comprising preparing a plurality of rubber molded bodies constituting a part of an annular body having a desired shape by vulcanization molding, The plurality of rubber molded bodies are sequentially joined to obtain the annular body.

  In the rubber molded body joining method according to the first aspect of the invention, since the joining target portions in the rubber molded body to be joined are arranged at predetermined intervals through a positioning means in a predetermined mold, By the vulcanization molding of the unvulcanized rubber loaded in the cavity formed by the mold and the mold, the joining target parts are accurately joined at an intended interval. Therefore, when a plurality of rubber molded bodies are joined and connected in the same manner to form a series of rubber molded bodies, a rubber molded body with high dimensional accuracy can be obtained. In addition, the unvulcanized rubber involved in the joining is molded integrally between the parts to be joined in the cavity, so that the rubber of the vulcanized joined part forms part of the series of rubber molded bodies. Constructs and does not give a sense of incongruity to the texture as a series of rubber moldings. In particular, when the rubber molded body to be joined and the rubber of the joint are made of the same material, this uncomfortable feeling hardly occurs.

  Then, the unvulcanized rubber is loaded into the cavity by injecting the unvulcanized rubber into the cavity after the mold is clamped, and in parallel with the injection, the unvulcanized rubber When the vulcanization molding is performed, unvulcanized rubber spreads in every corner of the cavity, and molding integration is ensured. Moreover, when performing the vulcanization molding of the unvulcanized rubber in parallel with the mold clamping, the unvulcanized rubber is arranged in the cavity before the mold clamping. Since so-called pressure molding is performed in parallel with mold clamping, efficient molding is performed.

  Further, if the positioning means is constituted by a mutual fitting relationship between the rubber molded body and the concavo-convex portions formed on the mold, the concavo-convex portion is disposed when the rubber molded body is placed on the mold. By fitting the parts together, positioning of the rubber molded body with respect to the mold can be performed easily and accurately.

  Furthermore, if the cross-sectional shape of the cavity is the same as the shape of the joined end face at the site to be joined of the rubber molded body, the rubber molded body to be joined is formed at the site to be joined via the molded joint. And have the same continuous shape. Accordingly, when a series of rubber molded bodies formed by joining is used as a gasket, the sealing function is also exhibited without problems.

In the method for manufacturing the annular rubber gasket according to the second invention, the plurality of rubber molded bodies prepared in advance by vulcanization molding constitute a part of the annular body having a desired shape. An annular body as an annular rubber gasket can be easily obtained by sequentially joining by the joining method of the rubber molded bodies. Further, the rubber moldings to be joined are, after being arranged at predetermined intervals via the positioning means in a predetermined mold, it unvulcanized loaded in the cavity formed by the gap and the mold Since the parts to be joined are joined by vulcanization molding of vulcanized rubber, an annular rubber gasket with high dimensional accuracy is accurately produced. And even if it is a large gasket, it is formed by joining the divided parts, so this is possible with a small molding device, especially if the mold is divided into a plurality for each same shape, The number of molds can be reduced and the capital investment can be reduced. Furthermore, even in the case of an insert molded gasket, if it is divided into a shape including the insert portion and then joined and molded, the production of the gasket can be made more efficient.

  And by setting the number of rubber moldings to be joined appropriately, or by preparing various lengths of rubber moldings and combining them appropriately, the specifications of the annular rubber gasket as a product differ, Even in the case of various sizes, a large-scale device is not required, the mold can be shared, and it can be handled flexibly. In the case of shape change, it is not necessary to recreate the entire mold as in the case of manufacturing a large gasket integrally, and it is only necessary to recreate only the mold corresponding to the changed portion. Also, if the cross-sectional shape of the cavity is the same as the shape of the end face part to be joined in the part to be joined of the rubber molded body, the sealing function along the circumferential direction is uniformly expressed and the suitability as a gasket is sufficient. You can be sure of what you prepared for.

(A) (b) (c) is a conceptual sectional view showing an embodiment of the method for joining rubber molded bodies according to the present invention, (a) is a mold preparation stage, (b) is a mold. (C) shows the stage of vulcanization molding while clamping the mold and injecting unvulcanized rubber into the cavity. (A) is an XX arrow expanded sectional view in FIG.1 (c), (b) is the YY arrow expanded sectional view. It is a ZZ line arrow expanded sectional view in Drawing 1 (c). It is the same figure which shows the modification of the part corresponded in FIG. It is the same figure which shows another modification of the part corresponded in FIG. It is the same figure which shows another modification of the part corresponded in FIG. (A) (b) (c) (d) is a partially broken plan view of the rubber molded body of the example shown in FIGS. (A) (b) (c) is a conceptual sectional view showing another embodiment of the method for joining rubber molded bodies according to the present invention, (a) is a mold preparation stage, (b) is (C) shows the stage of placing the rubber molded body in the mold and placing the unvulcanized rubber in the cavity, and (c) shows the stage of vulcanization molding while compressing the unvulcanized rubber by clamping the mold. Yes. It is a partially broken top view which shows an example of the cyclic | annular rubber gasket produced using the joining method of the rubber molding of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. 1 (a), 1 (b), and 1 (c) show an embodiment of a method for joining rubber molded bodies according to the present invention. FIG. 1A shows a preparation stage of a molding apparatus (mold) 1 used in the present joining method. The molding apparatus 1 includes a lower mold 2 and an upper mold 3. The lower mold 2 is composed of a horizontally long block body, and an upper concave groove 2a for receiving a lower portion of a rubber molded body 10 to be described later is provided on the upper surface thereof in the longitudinal direction. Further, the upper mold 3 is made of a block body shorter than the lower mold 2, and a downward concave groove 3a for receiving the upper part of a rubber molded body 10 to be described later is provided on the lower surface over the longitudinal direction. Yes. The upper mold 3 is configured to be combined with the lower mold 2 on the upper surface of the central portion in the longitudinal direction by mold clamping. And the pin 2b which comprises the positioning means 4 mentioned later is provided in the both sides of the said concave groove 2a on the upper surface of the lower metal mold | die 2 located in the both sides of the part with which this upper metal mold | die 3 is united. . An injection port 3b extending from the upper surface of the upper mold 3 to the concave groove 3a is penetrated, and a nozzle portion of an injection device (not shown) is connected to the injection port 3b. ing. Furthermore, a heater (not shown) for vulcanizing unvulcanized rubber is embedded or attached to the upper mold 3 and the lower mold 2 where the upper mold 3 is combined.

  The rubber moldings 10 and 10 to be joined are solid rod-like bodies formed in advance to a predetermined length by rubber vulcanization molding, and the cross-sectional shape is an oval extending in the vertical direction. As shown in FIG. 1 (b), the rubber moldings 10 and 10 are disposed at predetermined positions of the lower mold 2 with their lower portions received in the concave grooves 2a. This predetermined position is a position where the bonded end surface portions 10b and 10b of the bonding target portions 10a and 10a of the two rubber molded bodies 10 and 10 face each other with a predetermined distance D, and this position is formed in the lower mold 2. The positioning means 4 is defined by the pin 2b and the pin hole 10c formed in each of the rubber molded bodies 10 and 10. That is, tongue pieces 10d are protruded in a hook shape on both sides in the width direction of the joining target portion 10a of each rubber molded body 10, and the pin hole 10c is formed in each tongue piece 10d. (See also FIGS. 3 and 7 (a)). These pin holes 10c are fitted to the pins 2b when the bonding target portions 10a of the respective rubber molded bodies 10 are arranged on the lower mold 2, and the bonding target portions 10a are formed by the fitting relationship of the unevenness. The formation position is set so as to be positioned with the gap D.

  Thus, after a pair of rubber moldings 10 and 10 are arranged on the lower mold 2, as shown in FIG. 1 (c), the upper mold 3 has its concave groove 3a to form a rubber molded body. 10 and 10 are placed so as to straddle the joining target portions 10a and 10a, and the die assembly of the lower die 2 and the upper die 3 is performed. By this combination, the cavity 50 is formed by the concave groove 2 a of the lower mold 2, the joined end surface portions 10 b and 10 b, and the concave groove 3 a of the upper mold 3. Unvulcanized rubber G is injected into the cavity 50 from the injection port 3b, and heated by the heater in parallel, so that the unvulcanized rubber G follows the internal shape of the cavity 50. Is done. By this vulcanization molding, a joining portion 5 made of vulcanized rubber is formed which joins the joining target portions 10a and 10a to each other. Then, as shown in FIGS. 2A and 2B, the cross-sectional shape of the cavity 50 formed by the coalescence is a joined end face portion 10b in the joining target portions 10a, 10a of the rubber molded bodies 10, 10. Since it becomes the same shape as the shape of 10b, joining object part 10a, 10a makes the continuous outer shape through the junction part 5 by vulcanized rubber.

  Examples of the rubber constituting the rubber molded body 10 and the joint 5 include ethylene propylene rubber (EPDM), acrylonitrile butadiene rubber (NBR), styrene butadiene rubber (SBR), acrylic rubber (ACM), and hydrogenated acrylonitrile butadiene rubber (HNBR). ), Silicone rubber (VMQ), fluorosilicone rubber (FVMQ), fluorine rubber (FKM) and the like are employed. In particular, when producing a large-sized annular rubber gasket that is used for a part that comes into contact with oil by this joining method, NBR, ACM, FKM, FVMQ, etc. are used for a part that comes into contact with water or LLC. When manufacturing, EPDM, HNBR, and VMQ are desirably employed. The rubbers constituting the two are preferably the same in terms of compatibility with each other and the bonding strength, but may be different from each other when a predetermined bonding strength is obtained. When the rubber moldings 10 and 10 are joined to each other by injection molding as illustrated, the distance D is larger than the diameter of the injection port 3b, and is therefore 1 mm or more. As a method of vulcanizing and molding the unvulcanized rubber G by injection, a transfer molding method can be adopted in addition to the injection molding method as illustrated.

  4 and 7B show a modification of the positioning means 4. In the case of this example, a small hole 2c is formed on the upper surface of the lower mold 2, and the tongue piece 10d is formed in a bowl shape on both sides in the width direction of the joining target portion 10a of each rubber molded body 10 in the same manner as described above. A small protrusion 10e is integrally formed downward on each lower surface of the tongue piece 10d. The small hole 2c is formed so that the small protrusion 10e can be inserted, and the small hole 2c and the small protrusion 10e constitute the positioning means 4. The small protrusion 10e may be removed after the joint molding. In particular, when it is applied to the manufacture of a gasket, it is desirable to excise it if it affects the sealing performance.

  5 and 7 (c) show another modification of the positioning means 4. FIG. In the case of this example, a pin 2b is formed on one side of the concave groove 2a on the upper surface of the lower mold 2, and a tongue is formed on one side in the width direction of the joining target portion 10a of the rubber molded body 10 in the same manner as described above. A piece 10d is projected in a hook shape, and a pin hole 10g is formed in the tongue piece 10d through a metal collar 10f. The pin hole 10g is a bolt for fastening the two members to be sealed to each other when the joined body obtained by the present joining method is an annular gasket interposed between two members (not shown) to be sealed. It is an insertion hole and also serves as a part of the positioning means 4 of the rubber gasket 10 at the time of joining. The collar 10f is integrally assembled by insert molding when the rubber molded body 10 is molded, or is assembled by press-fitting after molding, and has a function of preventing over-compression of the annular gasket at the time of fastening. When the bonding is performed, the rubber molded body 10 is positioned by fitting the pin holes 10g into the pins 2b formed in the lower mold 2. Therefore, the positioning means 4 is comprised by the pin 2b and the pin hole 10g.

  6 and 7 (d) show still another modified example of the positioning means 4. FIG. In this example, as in the example of FIGS. 5 and 7C, the bolt insertion hole when used in the annular gasket also serves as a part of the positioning means 4. In the case of this example, the rubber molded body 10 is formed so as to bypass the portion where the bolt insertion hole is formed, and a flat portion 10h is formed in the concave curved portion for this bypass. A pin hole 10g is formed in the flat portion 10h through a metal collar 10f, as in the example of FIGS. 5 and 7C. Then, a pin 2b is formed on the upper surface of the lower mold 2 in the same manner as described above, and when the bonding is performed, the pin hole 10g is fitted into the pin 2b formed in the lower mold 2 to perform rubber molding. The body 10 is positioned. Therefore, the positioning means 4 is similarly comprised by the pin 2b and the pin hole 10g.

  FIG. 8 shows another embodiment of the method for joining rubber moldings according to the present invention. The bonding method shown in the figure is different from the example shown in FIG. 1 in that the molding for forming the bonding portion is performed by pressure (compression) molding. That is, the illustrated molding apparatus (die) 1 includes a lower mold 2 having a concave groove 2a similar to the example of FIG. 1 and a concave groove 3a similar to the example of FIG. 1, but having an injection port 3b. It is comprised with the upper metal mold | die 3 which is not. And the pin 2b which comprises the positioning means 4 with the pin hole 10c mentioned later is provided in the upper surface of the lower metal mold | die 2 similarly to the example of FIG.

  Thus, in FIG. 8A, the lower mold 2 and the upper mold 3 are prepared as in the example of FIG. And as shown in FIG.8 (b), the rubber molding 10 is arrange | positioned in the recessed groove 2a of the lower metal mold 2 in the state which received the lower part. In this arrangement, the rubber molded body 10 is positioned by fitting a pin hole 10c formed in the same manner as described above to the pin 2b, whereby the joined end surface portions 10b of the joining target portions 10a, 10a, 10b face each other with a predetermined distance D. An unvulcanized rubber G is arranged in the air space portion formed by the joined end surface portions 10b, 10b and the concave groove 2a so as to protrude slightly from the air space portion as shown in the figure.

Next, as shown in FIG. 8 (c), the upper mold 3 is covered with the concave mold 3a so as to straddle the joining target portions 10a, 10a of the rubber molded bodies 10, 10, and the lower mold 2 and the upper mold 3 Mold clamping with the mold 3 is performed. By this combination, the cavity 50 is formed by the concave groove 2 a of the lower mold 2, the joined end surface portions 10 b and 10 b, and the concave groove 3 a of the upper mold 3. Along with the formation of the cavity 50, the unvulcanized rubber G disposed in the airspace portion is compressed, and in parallel with this, heating by the heater is performed in the same manner as described above. Vulcanized and molded. By this vulcanization molding, a joining portion 5 made of vulcanized rubber is formed which joins the joining target portions 10a and 10a to each other. And the cross-sectional shape of the cavity 50 formed by the coalescence is the same shape as the shape of the joined end surface portions 10b and 10b in the joining target portions 10a and 10a of the rubber molded bodies 10 and 10 as described above. The joining target parts 10 a and 10 a have a continuous outer shape via the joining part 5.
Since other configurations are the same as the example shown in FIG. 1, the same reference numerals are given to the common portions, and the description thereof is omitted here.

  FIG. 9 shows an example of an annular gasket produced by a manufacturing method to which the above joining method is applied. The annular gasket 6 shown in the figure is a large-diameter large-sized gasket used for a battery for an automobile and the like, and exemplifies a case where the overall shape is a square, but is not limited thereto, and is circular, oval, or It may be a shape such as a shape in which meandering shapes are combined. The annular gasket 6 shown in the figure has a plurality of straight rubber molded bodies 10 and four corner rubber molded bodies 10 '... as part parts, and these rubber molded bodies 10 and 10' are appropriately combined. Are joined together to form a square annular body. Each rubber molded body 10, 10 'as these part parts has pin holes 10c, 10g constituting a part of the positioning means 4 in the molding apparatus at the time of joining. By this positioning means 4, the joined end surface portions 10 b, 10 b of the joining target portions 10 a, 10 a are arranged with a predetermined distance D, and the joined end surface portions 10 b, 10 b are sequentially fixed by the vulcanized rubber joined portions 5. By joining, an annular rubber gasket 6 as shown in the figure is formed. As described above, the pin hole 10g also serves as a bolt insertion hole when the two members to be sealed are fastened with the annular rubber gasket 6 interposed therebetween, and is arranged at appropriate intervals along the circumferential direction of the annular rubber gasket 6. Is done.

  The cross-sectional shape of the annular rubber gasket 6 excluding the portion where the tongue piece 10d is formed is, for example, a vertically long oval shape as shown in FIG. 2, and this oval shape is continuous including the joint portion 5 over the entire circumference. Shaped. And the sealing object 2 member is fastened in a state in which the upper half portion is fitted in the circumferential groove formed on the sealed surface of the upper member of the sealing object 2 member. Therefore, in a state of being interposed between the two members to be sealed, a uniform sealing property can be obtained over the entire circumference. In the case of this type of annular rubber gasket, depending on the product specifications to be applied, it may be necessary to prepare a plurality of types having the same cross-sectional shape (size) but different overall shapes (sizes). . In such a case, the number of rubber moldings 10 used as the parts is changed, or a plurality of rubber moldings 10 having different lengths are prepared, and these are appropriately selected and combined. Can cope with this. Therefore, it is not necessary to prepare the molding apparatus 1 for each product specification. In this way, even the large annular rubber gasket 6 is formed by joining the divided portions, and this is possible with the small molding device (mold) 1, and in particular for each same shape. If a plurality of molds are prepared, the number of molds can be reduced and the capital investment can be suppressed. In this case, if there is a change in the shape of the gasket, etc., it is only necessary to recreate the corresponding mold, and such a response can be made accurately without requiring a large amount of cost.

  In addition, the cross-sectional shape of the rubber molded body 10 (annular rubber gasket 6) is not limited to the illustrated example, and various shapes such as a mountain shape, a circular shape, a square shape, and the like can be adopted. The joining method of the present invention is applied not only to the production of large annular rubber gaskets, but also to the production of gaskets, packings and other rubber products in other automobile fields, industrial machinery fields, battery fields, industrial plant fields, etc. be able to. Further, in the annular rubber gasket 6 shown in FIG. 9, the rubber molded body 10 shown in FIGS. 7 (b) and 7 (d) is appropriately arranged in the circumferential direction, or these are sequentially joined to form the annular rubber gasket 6. It is also possible to configure.

1 (2, 3) Molding device (mold)
4 positioning means 5 joint 50 cavity 6 annular rubber gasket (annular body)
DESCRIPTION OF SYMBOLS 10 Rubber molded object 10a Joint object site | part 10b Joined end surface part D Space | interval G Unvulcanized rubber

Claims (6)

A method of joining rubber molded bodies, which is formed by vulcanization molding of rubber in advance and joins a plurality of rubber molded bodies constituting a part of an annular body ,
Via positioning means for positioning to face with a predetermined interval bonding target portion to a Jo Tokoro mold in the rubber moldings to be joined, placing the rubber moldings in the mold, the A method for joining rubber moldings, comprising: filling unvulcanized rubber into a cavity formed by an interval and the mold; and vulcanizing and molding the unvulcanized rubber to join the parts to be joined together . In the joining method of the rubber molding according to claim 1,
The unvulcanized rubber is loaded into the cavity by injecting the unvulcanized rubber into the cavity after the mold is clamped, and in parallel with the injection, the unvulcanized rubber is added. A method for joining rubber moldings, characterized by performing sulfur molding. In the joining method of the rubber molding according to claim 1,
The unvulcanized rubber is loaded into the cavity by placing the unvulcanized rubber in the cavity before the mold is clamped, and the unvulcanized rubber is parallel to the mold clamping. A method for joining rubber moldings, characterized by performing vulcanization molding. In the joining method of the rubber molding according to any one of claims 1 to 3,
The positioning means is configured by a mutual fitting relationship between a concave portion or a convex portion formed on both sides or one side in the width direction of the rubber molded body and a convex portion or a concave portion formed on the mold. A method for joining rubber moldings. In the joining method of the rubber molding according to any one of claims 1 to 4,
A method for joining rubber moldings, characterized in that a cross-sectional shape of the cavity is the same as a shape of an end face part to be joined at a part to be joined of the rubber moldings.   5. A plurality of rubber moldings prepared by vulcanization molding comprising a plurality of rubber moldings constituting a part of an annular body having a desired shape, and the rubber molding molding method according to claim 1. A method for producing an annular rubber gasket, comprising sequentially joining bodies to obtain the annular body.

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