JP5750255B2 - Seal material and manufacturing method thereof - Google Patents

Description

  The present invention relates to a sealing material and a manufacturing method thereof, and more particularly to a sealing material obtained by coating a core material with a rubber material and a manufacturing method thereof.

  Conventionally, for example, in Patent Document 1, a rubber ring portion having a ring main body and a lip portion extending from the ring main body toward the inner peripheral side which is the gas pressure side and forming an opening, The ring portion is harder than the ring portion and has compression elasticity, and is composed of a flat plate-like annular gasket body fixed to the outer peripheral side of the ring portion, and the lip portion of the ring portion is A composite gasket for a dresser type gas pipe joint is disclosed that protrudes in the thickness direction rather than the thickness of the gasket body.

JP-A-10-122373

  However, for example, when the gasket main body of the composite gasket as described above is made of metal and the composite gasket is disposed between pipe flanges covered with a resin liner layer, sealing is performed with the gasket main body. The liner layer may be deformed by the pressure contact, and the sealing performance between the pipe flanges may be insufficient.

  Thus, for example, it is conceivable to cover the gasket body with a rubber material. However, when mass-producing a gasket formed by coating a core material with a rubber material, for example, if the arrangement of the core material in the rubber material varies, the sealing performance of the gasket also varies.

  This invention is made | formed in view of the said subject, Comprising: It aims at providing the sealing material by which the core material was arrange | positioned reliably in the desired position, and its manufacturing method.

  The manufacturing method of the sealing material which concerns on one Embodiment of this invention for solving the said subject coat | covers a core material with a rubber material in the molding space in a metal mold | die, and coat | covers the said core material and the said core material And a covering portion made of the rubber material, wherein the core material is held at a predetermined position in the vertical direction of the molding space, and the core material is placed in the molding space. A horizontal positioning portion that holds the predetermined position in the horizontal direction, and prepares the core made of a material harder than the rubber material in the molding space of the mold, the vertical positioning portion and the The horizontal positioning portion holds the rubber material at a predetermined position in the vertical direction and a predetermined position in the horizontal direction, and arranges the molten rubber material around the core material, and then places the rubber material around the core material. Harden It is characterized in. ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the sealing material by which the core material is arrange | positioned reliably in the desired position can be provided.

  The mold includes a plurality of vertical positioning portions that sandwich the core material so as to hold the core material in a predetermined position in the vertical direction, and the core material so as to hold the core material in a predetermined position in the horizontal direction. It is good also as having the said some horizontal positioning part contact | abutted to the outer periphery of a core material. Further, in this case, the mold has a first mold and a second mold respectively disposed on one side and the other side in the vertical direction so that the molding space is formed therebetween, and a plurality of the vertical positioning The portion includes a plurality of first vertical positioning portions protruding from the first mold to the other side, and a plurality of second vertical positioning portions protruding from the second mold to the one side so as to face the plurality of first vertical positioning portions. It is good also as having a vertical positioning part. Further, in these cases, a plurality of holes are formed in the vertical direction at positions corresponding to the outer periphery of the core material of the mold, and the plurality of lateral positioning portions are inserted through the plurality of holes and It may be a plurality of members that contact the outer periphery.

  The core member has a ring shape, and the covering portion includes a base portion that covers the core member, and an extension that is integrally formed with the base portion and extends to the inner peripheral side and / or the outer peripheral side of the base portion. It is good also as being a ring shape which has an installation part. The core material may be made of metal. The sealing material may be a gasket.

  A sealing material according to an embodiment of the present invention for solving the above problems is manufactured by any one of the above methods, and includes the core material and a covering portion made of the rubber material that covers the core material. It is characterized by that. ADVANTAGE OF THE INVENTION According to this invention, the sealing material by which the core material was arrange | positioned reliably in the desired position can be provided.

  For example, the covering portion may be formed with a bottomed hole corresponding to the vertical positioning portion and a recess or hole corresponding to the lateral positioning portion.

  ADVANTAGE OF THE INVENTION According to this invention, the sealing material by which the core material was arrange | positioned reliably in the desired position, and its manufacturing method can be provided.

It is a perspective view which shows the external appearance about an example of the sealing material which concerns on one Embodiment of this invention. It is a top view of an example of the sealing material which concerns on one Embodiment of this invention. It is sectional drawing of the sealing material cut | disconnected by the III-III line | wire shown in FIG. It is sectional drawing which expands and shows a part of sealing material enclosed with the broken line IV shown in FIG. It is sectional drawing which expands and shows a part of sealing material enclosed with the broken line V shown in FIG. It is a top view of the metal mold | die used in an example of the manufacturing method of the sealing material which concerns on one Embodiment of this invention. It is sectional drawing of the metal mold | die cut | disconnected by the VII-VII line shown in FIG. It is sectional drawing which expands and shows a part of metal mold | die enclosed with the broken line VIII shown in FIG. It is sectional drawing which shows a mode that a sealing material is taken out from the metal mold | die used in an example of the manufacturing method of the sealing material which concerns on one Embodiment of this invention. It is a top view of the other example of the sealing material which concerns on one Embodiment of this invention. It is sectional drawing of the sealing material cut | disconnected by the XI-XI line shown in FIG.

  Hereinafter, an embodiment of the present invention will be described. Note that the present invention is not limited to this embodiment.

  FIG. 1 is a perspective view showing an appearance of an example of the sealing material 1 according to the present embodiment. FIG. 2 is a plan view of an example of the sealing material 1 according to the present embodiment. 3 is a cross-sectional view of the sealing material 1 cut along the line III-III shown in FIG. 4 is an enlarged cross-sectional view of a part of the sealing material 1 surrounded by a broken line IV shown in FIG. FIG. 5 is an enlarged cross-sectional view showing a part of the sealing material 1 surrounded by a broken line V shown in FIG.

  The sealing material 1 is a member that is sandwiched between the first member and the second member at a connection portion between the first member and the second member and seals the connection portion. Here, in the following description, the direction in which the first member, the sealing material 1 and the second member are laminated is referred to as “vertical direction”, and the direction crossing the “vertical direction” is referred to as “lateral direction”. In addition, one side and the other side in the vertical direction may be referred to as “upper side” and “lower side”, respectively.

  In this embodiment, the sealing material 1 is a gasket. That is, the sealing material 1 is a ring-shaped molded body that seals the connection portion between the hollow first member and the second member in which a fluid such as gas or liquid is held or circulated.

  Specifically, the sealing material 1 includes, for example, a connection portion between the first pipe and the second pipe (more specifically, for example, a flange (pipe flange) formed at an end of the first pipe) And a flange formed at the end of the second pipe), and a gasket for piping that is sandwiched between the first pipe and the second pipe and seals the connection part. .

  As shown in FIGS. 1 to 5, the sealing material 1 includes a core material 10 and a covering portion 20 made of a rubber material that covers the core material 10.

  The core material 10 is made of a material harder than the rubber material of the covering portion 20. The material constituting the core material 10 is not particularly limited as long as the material is harder than the rubber material. For example, the core material 10 may be a material harder than the rubber material and having no compression elasticity. Specifically, as the material of the core material 10, for example, an organic material such as a metal (for example, carbon steel, stainless steel), a resin (for example, polyethylene, PTFE (polytetrafluoroethylene)), or an inorganic material may be used. it can. In the present embodiment, the core material 10 is made of metal.

  The shape of the core material 10 is not particularly limited as long as it can be covered with a rubber material. In the present embodiment, the core material 10 has a ring shape in which a through hole is formed at the center thereof. More specifically, the core member 10 has a circular ring shape in which a circular through hole is formed in the center in plan view, and both the outer periphery 10a and the inner periphery 10b are circular (see FIG. 2).

  In addition, when the core material 10 is ring shape, the shape in the planar view is not restricted to a circle. That is, in the present embodiment, the outer periphery 10a and the inner periphery 10b of the core member 10 are concentric circles (see FIG. 2), but are not limited to this, for example, any arbitrary shape such as a circle, an ellipse, a polygon, etc. It can also be set as the shape.

  In the present embodiment, the core material 10 is a plate-like body. That is, as shown in FIGS. 3 to 5, the core material 10 is a molded body having an upper surface 10 c (a surface on one side in the vertical direction) and a lower surface 10 d (a surface on the other side in the vertical direction) that are parallel to each other. In addition, although the cross section of the ring-shaped core material 10 is a rectangle in this embodiment, it is not restricted to this, For example, it can also be set as another quadrangle | tetragon, another polygon, a circle | round | yen, and an ellipse.

  The covering portion 20 is made of a rubber material that covers the core material 10. The rubber material constituting the covering portion 20 is not particularly limited as long as it is softer than the material constituting the core material 10. For example, a rubber material that melts by heating and exhibits fluidity is preferable. Specifically, as the rubber material of the covering portion 20, for example, acrylonitrile butadiene rubber (NBR), ethylene-propylene-diene copolymer rubber (EPDM), polychloroprene rubber (CR), and silicone rubber can be used. .

  The shape of the covering portion 20 is not particularly limited as long as it is a shape capable of covering the core material 10, and may be a shape corresponding to the core material 10, for example. That is, in this embodiment, the covering portion 20 has a ring shape in which a through hole 21 is formed at the center corresponding to the shape of the core material 10. More specifically, the covering portion 20 has a circular ring shape in which a circular through hole 21 is formed in the center in plan view, and both the outer periphery 20a and the inner periphery 20b are circular (see FIG. 2). .

  In addition, when the coating | coated part 20 is ring shape, the shape is not restricted circularly. That is, in the present embodiment, the outer periphery 20a and the inner periphery 20b of the covering portion 20 are concentric circles (see FIG. 2), but are not limited to this, for example, any arbitrary shape such as a circle, an ellipse, a polygon, etc. It can be made into the shape.

  In the present embodiment, the covering portion 20 includes a base portion 30 that covers the core member 10, and an extending portion that is integrally formed with the base portion 30 and extends to the inner peripheral side of the base portion 30 (hereinafter, “ Lip portion 40 ")).

  The base 30 is made of a rubber material that covers the upper surface 10c and the lower surface 10d of the core member 10, respectively. In the present embodiment, the shape of the base portion 30 is a shape corresponding to the core material 10, and the outer periphery of the base portion 30 (that is, the outer periphery 20a of the covering portion 20) is circular in plan view (see FIG. 2).

  Moreover, in this embodiment, the base 30 is shape | molded by plate shape. In other words, the base 30 has a parallel upper surface (a part of the upper surface 20c of the covering portion 20 covering the upper surface 10c of the core material 10) and a lower surface (one of the lower surfaces 20d of the covering portion 20 covering the lower surface 10d of the core material 10). Part (see FIGS. 3 to 5). Furthermore, the upper surface and the lower surface of these base portions 30 are parallel to the upper surface 10c and the lower surface 10d of the core member 10, respectively.

  The lip portion 40 has an upper lip portion 41 and a lower lip portion 42 that extend while inclining upward and downward from the base portion 30 inward in the radial direction. The thickness of the lip portion 40 (distance from the upper surface of the upper lip portion 41 to the lower surface of the lower lip portion 42) is larger than the thickness of the base portion 30 (distance from the upper surface of the base portion 30 to the lower surface) (FIG. 3). (See FIG. 5).

  Next, a method for manufacturing a sealing material according to the present embodiment (hereinafter referred to as “the present method”) will be described. FIG. 6 is a plan view of a mold 100 used in an example of the present method. FIG. 7 is a cross-sectional view of the mold 100 cut along the line VII-VII shown in FIG. FIG. 8 is an enlarged cross-sectional view of a part of the mold 100 surrounded by a broken line VIII shown in FIG. FIG. 9 is a cross-sectional view showing how the sealing material 1 is taken out from the mold 100. 6 shows the mold 100 with the upper mold 120 shown in FIG. 7 removed.

  In this method, the core material 10 is covered with a rubber material in the molding space 110 in the mold 100, and the seal includes the core material 10 and the covering portion 20 made of the rubber material that covers the core material 10. This is a method for manufacturing the material 1.

  The molding space 110 of the mold 100 is a space formed in the mold 100 in order to perform molding for covering the core material 10 with a rubber material. The molding space 110 is formed in a shape corresponding to the outer shape of the sealing material 1 (that is, the outer shape of the covering portion 20). That is, the outer periphery 110a, the inner periphery 110b, the upper surface 110c, and the lower surface 110d of the molding space 110 are formed in shapes corresponding to the outer periphery 20a, the inner periphery 20b, the upper surface 20c, and the lower surface 20d, respectively, of the covering portion 20 (FIG. 7, (See FIG. 8).

  One of the characteristic features of this method is that the longitudinal positioning portion 200 (see FIG. 8) that holds the core material 10 at a predetermined position in the longitudinal direction of the molding space 110 and the core material 10 in the molding space 110. And a horizontal positioning part 300 (see FIG. 7) that holds it at a predetermined position in the horizontal direction.

  The shape, arrangement, and number of the vertical positioning unit 200 and the horizontal positioning unit 300 are not particularly limited as long as the core material 10 can be held at a predetermined position in the molding space 110, but the positioning of the core material 10 is ensured. In order to do this, it is preferable to provide a plurality of vertical positioning portions 200 and a plurality of horizontal positioning portions 300.

  Therefore, the mold 100 according to this embodiment includes a plurality of vertical positioning portions 200 that sandwich the core material 10 so as to hold the core material 10 at a predetermined position in the vertical direction, and the core material 100 at a predetermined position in the horizontal direction. A plurality of lateral positioning portions 300 that come into contact with the outer periphery of the core material 10 so as to be held at the same position.

  That is, in this method, the position of the core material 10 in the vertical direction of the molding space 110 is fixed by sandwiching the core material 10 in the vertical direction by the plurality of vertical positioning portions 200 of the mold 100.

  Moreover, in this method, the position of the said core material 10 in the horizontal direction (radial direction of the core material 10) of the shaping | molding space 110 is enclosed by surrounding the outer periphery 10a of the core material 10 with the some horizontal positioning part 300 of the metal mold | die 100. To fix.

  The number of the vertical positioning units 200 and the horizontal positioning units 300 is not particularly limited as long as it is plural, but it is preferable that the number of the vertical positioning units 200 and the horizontal positioning units 300 is three or more in order to reliably position the core material 10. In the present embodiment, the mold 100 has six vertical positioning portions 200 and three horizontal positioning portions 300 (see FIG. 6).

  Further, the arrangement of the vertical positioning unit 200 and the horizontal positioning unit 300 is not particularly limited as long as the core material 10 can be held at a predetermined position in the molding space 110, but the core material 20 is reliably positioned. In this case, it is preferable to arrange the vertical positioning unit 200 and the horizontal positioning unit 300 regularly.

  That is, in the present embodiment, the plurality of vertical positioning portions 200 are arranged at equal intervals on the same circumference on the upper surface 10 c and the lower surface 10 d of the core material 10, and the plurality of horizontal positioning portions 300 are arranged on the core material 10. It arrange | positions at equal intervals along the outer periphery 10a (refer FIG. 6).

  In addition, the mold 100 according to the present embodiment is a first mold (hereinafter referred to as “the lower side”) arranged on one side (upper side) and the other side (lower side) in the vertical direction so that a molding space 110 is formed therebetween. 2) (hereinafter referred to as “lower mold 130”).

  The plurality of vertical positioning portions 200 are opposed to the plurality of first vertical positioning portions (hereinafter referred to as “upper positioning portions 210”) protruding downward from the upper mold 120 and the plurality of upper positioning portions 210. A plurality of second vertical positioning portions (hereinafter referred to as “lower positioning portions 220”) protruding upward from the lower mold 130 (see FIG. 7).

  That is, the plurality of upper positioning portions 210 and the plurality of lower positioning portions 220 face each other from the upper surface 110c (a part of the lower surface of the upper mold 120) and the lower surface 110d (a part of the upper surface of the lower mold 130) of the molding space 110, respectively. It protrudes as shown (see FIGS. 7 to 9). The plurality of upper positioning portions 210 and the plurality of lower positioning portions 220 are in contact with the upper surface 10c and the lower surface 10d of the core material 10, respectively, thereby sandwiching the core material 10 (see FIGS. 7 and 8).

  The shapes of the upper positioning portion 210 and the lower positioning portion 220 are not particularly limited as long as the core material 10 can be held at a predetermined position in the molding space 110. For example, the upper positioning portion 210 and the lower positioning portion 220 may be columnar shapes such as a cylinder and a polygonal column. (See FIGS. 6 to 9).

  Further, the shapes of the tip portions of the upper positioning portion 210 and the lower positioning portion 220 that contact the core material 10 are not particularly limited as long as the core material 10 can be held at a predetermined position in the molding space 110. That is, in the present embodiment, the tip portions of the upper positioning portion 210 and the lower positioning portion 220 have a trapezoidal shape in the longitudinal section (see FIG. 8), but are not limited to this, for example, a hemispherical curve or the like Or other polygonal shapes.

  In addition, a plurality of holes (hereinafter referred to as “insertion holes 101”) are formed in the vertical direction at positions corresponding to the outer periphery 10a of the core material 10 of the mold 100, and the plurality of lateral positioning portions 300 include a plurality of holes. A plurality of members are inserted through the insertion hole 101 and come into contact with the outer periphery 10a of the ten-core member 10 (see FIGS. 6, 7, and 9).

  That is, in the mold 100 according to the present embodiment, a plurality of insertion holes 101 penetrating from the upper mold 120 to the lower mold 130 are formed along the outer periphery 10a of the core member 10 (see FIG. 7). On the other hand, the lateral positioning unit 300 is a member formed separately from the upper mold 120 and the lower mold 130. That is, the lateral positioning unit 300 can be attached to and detached from the upper mold 120 and the lower mold 130.

  And the some horizontal positioning part 300 is arrange | positioned along the outer periphery 10a of the core material 10 by being penetrated by the some penetration hole 101. FIG. As a result, the plurality of lateral positioning portions 300 abut on the outer periphery 10a of the core member 10 inside the outer periphery 110a of the molding space 110 (see FIGS. 6 and 7).

  The shape of the lateral positioning portion 300 is not particularly limited as long as the core material 10 can be held at a predetermined position in the molding space 110, but may be a columnar shape such as a cylinder or a polygonal column (FIG. 6). (See FIGS. 7 and 9).

  Further, the mold 100 according to the present embodiment further includes a middle mold 140. The middle mold 140 is sandwiched between the upper mold 120 and the lower mold 130 so as to close the central portion of the molding space 110 corresponding to the through hole 21 of the covering portion 20 of the sealing material 1 (see FIG. 7). And the outer periphery of the middle mold | type 140 comprises the inner periphery 110b of the molding space 110 (refer FIG. 7, FIG. 8). Further, a fixing tool 141 for fixing them is inserted through the middle portions of the middle mold 140 and the lower mold 130 (see FIGS. 6 and 7).

  In this method, the mold 100 as described above is prepared, and in the molding space 110 of the mold 100, the core material 10 is moved to a predetermined position in the vertical direction by the vertical positioning unit 200 and the horizontal positioning unit 300. While being held at a predetermined position in the lateral direction, the melted rubber material is disposed around the core material 10, and then the rubber material is cured around the core material 10.

  That is, in this method according to the present embodiment, first, the core material 10 is sandwiched between the plurality of vertical positioning portions 200 (the plurality of upper positioning portions 210 and the lower positioning portions 220), thereby forming the core material 10 into a molding space. 110 is fixed at a predetermined position in the vertical direction, and the outer periphery 10a of the core material 10 is surrounded by a plurality of lateral positioning portions 300, whereby the core material 10 is placed in the horizontal direction of the molding space 110 (the radial direction of the core material 10). ) In place.

  Here, the position where the core member 10 is held in the vertical direction can be set to a desired position. For example, the core member 10 has the upper surface 20c and the lower surface of the covering portion 20 that covers the upper surface 10c and the lower surface 10d thereof. The upper surface 110c and the lower surface 110d of the molding space 110 respectively corresponding to a part of 20d are arranged so as to be parallel to the upper surface 10c and the lower surface 10d of the core member 10.

  In this case, the plurality of upper positioning portions 210 are equal to the thickness of the portion of the covering portion 20 that covers the upper surface 10c of the core material 10 (that is, the distance between the upper surface 110c of the molding space 110 and the upper surface 10c of the core material 10). It is formed in height (length in the vertical direction). Similarly, the plurality of lower positioning portions 220 are equal to the thickness of the portion of the covering portion 20 that covers the lower surface 10d of the core material 10 (that is, the distance between the lower surface 110d of the molding space 110 and the lower surface 10d of the core material 10). Formed to a height. In addition, the upper positioning part 210 and the lower positioning part 220 may be formed at the same height, or may be formed at different heights.

  Further, the position at which the core member 10 is held in the lateral direction can also be a desired position. For example, the core member 10 is arranged so that the center thereof coincides with the center of the covering portion 20. Is done. That is, centering of the core material 10 in the sealing material 1 is performed by the plurality of lateral positioning portions 300. In this case, the plurality of lateral positioning portions 300 are arranged on a circumference concentric with the outer periphery 10a of the core member 10 and the outer periphery 110a of the molding space 110 (see FIG. 6).

  Furthermore, in this method, the molten rubber material is disposed around the core material 10. That is, for example, in the molding space 110, sheet-like rubber materials are respectively disposed on the upper surface 10c side and the lower surface 10d side of the core material 10, and the rubber material is heated in the molding space 110 by heating the mold 100. Melt. Further, for example, a molten rubber material can be injected into the molding space 110 in which the core member 10 is fixed at a predetermined position. Then, by pressing and holding the core material 10 and the molten rubber material in the closed molding space 110, the rubber material can be filled around the core material 10.

  Next, in this method, the rubber material is cured around the core material 10. That is, the mold 100 is cooled to cure the rubber material filled around the core material 10. By such press molding, the covering portion 20 made of a rubber material that covers the core material 10 can be formed.

  Further, in the present embodiment, as shown in FIG. 9, the sealing material 1 molded in the mold 100 as described above is taken out from the mold 100 using an extrusion member 150. That is, a through hole (hereinafter referred to as “extrusion hole 131”) is formed in a part of the lower mold 130 below the middle mold 140 (see FIG. 7). On the other hand, the extruding member 150 has a base portion 151 and an extruding portion 152 that protrudes from the base portion 151 and can be inserted into the extruding hole 131 of the lower mold 130.

  After the molding of the sealing material 1, first, the upper mold 120 is removed from the lower mold 130 and the middle mold 140, and then the extrusion portion 152 of the extrusion member 150 is inserted into the extrusion hole 131 from below, and the extrusion portion 152 The middle mold 140 and the sealing material 1 are removed from the lower mold 130 by pushing up the middle mold 140. Finally, the sealing material 1 is removed from the middle mold 140.

  According to such a method, the sealing material 1 in which the core material 10 is reliably disposed at a desired position in the covering portion 20 can be efficiently manufactured.

  That is, for example, when the core material 10 is not securely fixed in the molding space 110 of the mold 100, the core material 10 is floated by pressurizing and filling a melted rubber material around the core material 10. However, the arrangement of the core material 10 cannot be reliably controlled.

  On the other hand, in this method, the core material 10 is fixed at a desired position by the vertical positioning portion 200 and the horizontal positioning portion 300, and then the molten rubber material is pressurized and filled around the core material 10, The core material 10 can be reliably held at a desired position throughout the molding process.

  Therefore, according to this method, the sealing material 1 with no variation in the arrangement of the core material 10 can be mass-produced. That is, for example, according to this method, the upper surface 10c and the lower surface 10d of the core material 10 and the seal material 1 in which the upper surface 20c and a part of the lower surface 20d of the covering portion 20 covering the upper surface 10c and the lower surface 10d are parallel. (That is, the sealing material 1 in which the thickness of the covering portion 20 covering the upper surface 10c and the lower surface 10d of the core material 10 is constant) can be reliably manufactured. Further, for example, it is possible to reliably manufacture the sealing material 1 in which the center of the sealing material 1 and the center of the core material 10 coincide (the centering of the core material 10 is reliably achieved). For this reason, the desired coating of the core material 10 with the rubber material can be reliably achieved, and a high yield can be achieved.

  Moreover, according to such a sealing material 1, a desired sealing can be achieved reliably. That is, for example, when the sealing material 1 is disposed between the first piping flange and the second piping flange, even if the relative position between the piping flange and the sealing material 1 is constant, the sealing material 1 If the arrangement of the core material 10 is different, the relative position between the pipe flange and the core material 10 is different, and as a result, the sealing performance by the seal material 1 is also different. For this reason, it is not easy to reliably achieve a desired sealing property when the sealing material 1 having a variation in the arrangement of the core material 10 is used. However, in spite of this, it is not easy to confirm the arrangement of the core material 10 embedded in the opaque covering portion 20 in advance.

  On the other hand, in the sealing material 1 manufactured by this method, there is no variation in the arrangement of the core material 10. For this reason, if the relative position between the piping flange and the sealing material 1 is constant in the above-described example, the relative position between the piping flange and the core material 10 is also constant, and the desired sealing performance can be achieved easily and reliably. Can do.

  In addition, the sealing material 1 which concerns on the example shown in FIGS. 1-9 is a fixing tool (for example, 1st piping and 2nd piping) for fixing a 1st member and a 2nd member (for example). For example, the sealing material 1 is positioned by bringing a fixing bolt) into contact with the outer periphery 20 a of the covering portion 20 of the sealing material 1. Therefore, in this case, by using the sealing material 1 in which the core material 10 is securely arranged so that the outer periphery 10a thereof and the outer periphery 20a of the covering portion 20 are concentric, a desired sealing property can be simply and Can be reliably achieved.

  In the example shown in FIGS. 1 to 9, the covering portion 20 of the sealing material 1 has bottomed holes 22 and 23 corresponding to the vertical positioning portion 200 and a recess corresponding to the lateral positioning portion 300 (hereinafter referred to as “peripheral recess 24”). ") Is formed.

  That is, a part of the upper surface 20c of the covering part 20 covering the upper surface 10c of the core material 10 and a part of the lower surface 20d of the covering part 20 covering the lower surface 10d of the core material 10 are provided with a plurality of upper positioning parts. A plurality of upper bottomed holes 22 corresponding to 210 and a plurality of lower bottomed holes 23 corresponding to the plurality of lower positioning portions 220 are respectively formed (see FIGS. 1 to 3 and 5).

  The bottoms 22a and 23a of the upper bottomed hole 22 and the lower bottomed hole 23 can be entirely composed of a thin film of rubber material by a slight inflow of molten rubber material during press molding. For example, the upper surface 10c and the lower surface 10d of the core member 10 may be exposed at part of the bottom portions 22a and 23a (see FIG. 5).

  Moreover, the some outer periphery hollow 24 corresponding to the some horizontal positioning part 300 is formed in a part of outer periphery 20a of the coating | coated part 20 which coat | covers the outer periphery 10a of the core material 10 (refer FIGS. 1-4). . The outer peripheral recess 24 is a notch extending from the upper surface 20c to the lower surface 20d of the covering portion 20, and the deepest portion 24a is entirely composed of a thin film of rubber material due to a slight inflow of molten rubber material during press molding. For example, the outer periphery 10a of the core member 10 may be exposed at a part of the deepest portion 24a.

  Needless to say, the number, arrangement, and shape of the bottomed holes 22, 23 and the outer peripheral recess 24 correspond to the number, arrangement, and shape of the vertical positioning portions 200 and the horizontal positioning portions 300.

  FIG. 10 is a plan view of another example of the sealing material 1 according to this embodiment. 11 is a cross-sectional view of the sealing material 1 cut along the line XI-XI shown in FIG.

  The core material 10 of the sealing material 1 according to this example is ring-shaped, and the covering portion 20 is formed integrally with the base portion 30 covering the core material 10 and the base portion 30 and extends to the outer peripheral side of the base portion 30. It is a ring shape having an extended portion (hereinafter referred to as “flange portion 50”).

  In the flange portion 50, the sealing material 1 is sandwiched between the first member and the second member (for example, between the first piping flange and the second piping flange), and these connecting portions are connected. In the case of sealing, a through hole 51 for inserting a fixture (for example, a fixing bolt) for fixing the first member and the second member is formed.

  The sealing material 1 according to this example can also be manufactured by this method using the mold 100 similar to the example shown in FIGS. That is, for example, in the example shown in FIG. 7, the molding space 110 is not formed on the outer side in the radial direction from the lateral positioning portion 300, but when forming the flange portion 50 as shown in FIGS. 10 and 11, The mold 100 in which the molding space 110 is formed on the outer side in the radial direction from the lateral positioning portion 300 is used.

  And in the coating | coated part 20 of the sealing material 1 which concerns on this example, the bottomed holes 22 and 23 corresponding to the vertical positioning part 200, and the hole corresponding to the horizontal positioning part 300 (henceforth "the outer peripheral hole 25"). Is formed.

  That is, the sealing material 1 includes a plurality of upper bottom holes 22 corresponding to the plurality of upper positioning portions 210 and a plurality of lower positioning portions 220 corresponding to the plurality of lower positioning portions 220, as in the examples of FIGS. The bottomed bottom hole 23 is formed. Further, a plurality of outer peripheral holes 25 corresponding to the plurality of lateral positioning portions 300 are formed in a part of the covering portion 20 along the outer periphery 10 a of the core member 10.

  Similar to the example of FIGS. 1 to 9 described above, the number, arrangement, and shape of the bottomed holes 22, 23 and the outer peripheral hole 25 correspond to the number, arrangement, and shape of the vertical positioning portions 200 and the horizontal positioning portions 300. It has become a thing. That is, in the example shown in FIGS. 10 and 11, the outer peripheral hole 25 is a hole that penetrates from the upper surface 20 c to the lower surface 20 d of the covering portion 20, but is not limited to this, and the lateral positioning used for manufacturing the sealing material 1. Depending on the shape of the part 300, for example, a bottomed hole formed in the upper surface 20c or the lower surface 20d may be used.

  DESCRIPTION OF SYMBOLS 1 Seal material, 10 core material, 10a outer periphery, 10b inner periphery, 10c upper surface, 10d lower surface, 20 coating | coated part, 20a outer periphery, 20b inner periphery, 20c upper surface, 20d lower surface, 21 through-hole, 22 upper bottomed hole, 22a bottom part , 23 Bottom bottom hole, 23a Bottom part, 24 Outer peripheral recess, 24a Deepest part, 25 Outer peripheral hole, 30 Base part, 40 Lip part, 41 Upper lip part, 42 Lower lip part, 50 Flange part, 51 Through hole, 100 Mold , 101 Insertion hole, 110 Molding space, 110a outer periphery, 110b inner periphery, 110c upper surface, 110d lower surface, 120 upper mold, 130 lower mold, 131 extrusion hole, 140 middle mold, 141 fixture, 150 extrusion member, 151 base , 152 Extrusion unit, 200 Vertical positioning unit, 210 Upper positioning unit, 220 Lower positioning unit, 300 Horizontal positioning unit.

Claims (8)

A method for producing a sealing material having a core material covered with a rubber material in a molding space in a mold and having the core material and a covering portion made of the rubber material for covering the core material,
A first mold and a second mold respectively disposed on one side and the other side in the longitudinal direction so that the molding space is formed;
A vertical positioning portion that holds the core material at a predetermined position in the vertical direction of the molding space; and the core material of the first mold and the second mold that holds the core material at a predetermined position in the horizontal direction of the molding space. Preparing a mold having a lateral positioning portion that is a plurality of members that are inserted through a plurality of holes formed in a vertical direction at positions corresponding to the outer periphery of the core member and abut against the outer periphery of the core member ;
In the molding space of the mold, the core material made of a material harder than the rubber material is held at the predetermined position in the vertical direction and the predetermined position in the horizontal direction by the vertical positioning portion and the horizontal positioning portion. A method for producing a sealing material, comprising: disposing the molten rubber material around the core material; and then curing the rubber material around the core material. The mold includes a plurality of vertical positioning portions that sandwich the core material so as to hold the core material in a predetermined position in the vertical direction, and the core material so as to hold the core material in a predetermined position in the horizontal direction. The manufacturing method of the sealing material according to claim 1, further comprising: a plurality of the lateral positioning portions that contact the outer periphery of the sealing material. The plurality of vertical positioning portions protrude from the first mold to the one side so as to face the plurality of first vertical positioning portions and the plurality of first vertical positioning portions to face the other side. process for the preparation of the sealing material according to claim 1 or 2, characterized in that a plurality of the second vertical positioning portion, the to. The core is ring-shaped,
The said covering part is a ring shape which has the base part which coat | covers the said core material, and the extension part integrally formed with the said base part and extended in the inner peripheral side and / or outer peripheral side of the said base part. The method for manufacturing a sealing material according to any one of claims 1 to 3 . The said core material is metal, The manufacturing method of the sealing material in any one of the Claims 1 thru | or 4 characterized by the above-mentioned. The method for manufacturing a sealing material according to any one of claims 1 to 5 , wherein the sealing material is a gasket. Produced by the method described in any one of claims 1 to 6,
A sealing material comprising: the core material; and a covering portion made of the rubber material that covers the core material. The sealing material according to claim 7 , wherein a bottomed hole corresponding to the vertical positioning portion and a depression or a hole corresponding to the horizontal positioning portion are formed in the covering portion.

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