JP2011190874A5 - - Google Patents

Description

Method for manufacturing molded product, method for manufacturing valve box for butterfly valve, and valve box for butterfly valve

The present invention relates to a method for manufacturing a large-diameter glass fiber reinforced resin molded article, a method for manufacturing a butterfly valve valve box as an example of a large-diameter glass fiber reinforced resin molded article, and a butterfly valve valve box .

  In a large-diameter butterfly valve, it is known to use a fiber reinforced resin valve box instead of a metal one that is prone to problems such as corrosion. An annular groove for mounting a seat ring has a ring portion formed on the inner periphery, and a valve rod support portion integrally provided at two positions displaced by 180 ° of the ring portion. A shaft hole for insertion is formed, and an O-ring groove for mounting an O-ring is formed in the shaft hole (Patent Document 1).

  In addition, as a method for manufacturing a fiber reinforced resin valve box, Patent Document 2 describes a method in which a resin is injected under pressure.

JP-A-6-288478 JP 59-140043 JP

When molding the valve box for a butterfly valve described in Patent Document 1, molding defects are likely to occur near the O-ring groove due to poor resin flow, insufficient glass fiber, etc., and such molding defects are improved. There is a need for a method for producing a possible molded article, a method for producing a butterfly valve valve box, and a butterfly valve box .

The purpose of this invention, a method of manufacturing defective molding molded article can be improved is to provide a manufacturing method and a butterfly valve valve body of the butterfly valve valve body.

The method for manufacturing a molded product according to the present invention includes a ring portion having an annular groove formed on the inner periphery thereof, and a support portion integrally provided at a required portion of the ring portion, and the support portion includes a penetrating shaft hole. A glass fiber reinforced resin molded product having a circumferential groove extending in the circumferential direction is formed in the shaft hole by a vacuum injection molding method, and a cylindrical shape for forming a support portion Use a ring-shaped mold having a projecting portion and provided with an annular ring portion for forming a circumferential groove on the outer periphery of the cylindrical projecting portion, and the cylindrical projecting portion with the annular ring portion of the mold And an impregnation roving layer is formed by winding the impregnation roving .

  The manufacturing method of a valve box for a butterfly valve according to the present invention includes a ring portion in which an annular groove for mounting a seat ring is formed on the inner periphery, and a valve stem support portion integrally provided at two positions displaced by 180 ° of the ring portion. A valve box for a butterfly valve made of glass fiber reinforced resin, in which a shaft hole for inserting a valve stem is formed in the valve stem support portion, and an O-ring groove for mounting an O-ring is formed in the shaft hole Is manufactured by a vacuum injection molding method, and has a cylindrical protrusion for forming a valve stem support portion, and an annular ring portion for forming an O-ring groove is provided in the cylindrical protrusion. And a step of forming an impregnated roving layer by winding an impregnated roving around a cylindrical protrusion with an annular ring portion of the mold.

  The vacuum injection molding method is a well-known method. After the glass substrate is set in a molding die, the molding die is assembled, and a resin that has been stirred by adding a curing agent is injected into the molding die. Is obtained by impregnating a glass substrate placed in a mold and impregnating the resin with a resin and curing at normal temperature.

  The impregnation roving is wound so as to cover the outer peripheral surface of the cylindrical protrusion, and the outer peripheral surface and both side surfaces of the annular ring portion.

In the method for manufacturing a molded article and the method for manufacturing a valve box for a butterfly valve according to the present invention, after the step of forming the impregnated roving layer, the multiaxial multilayer sheet base material is wound so as to eliminate the step generated by the annular ring portion. The method further includes the step of forming a multiaxial multilayer sheet base material laminated portion, and in this step, the multiaxial multilayer sheet base material has a roving length direction of any one of the layers in the axis direction of the cylindrical protrusion. It is preferable to arrange so as to be parallel to the direction.

  As a “multi-axial multilayer sheet base material”, a biaxial two-layer structure comprising a first layer formed by roving in a 0 ° direction and a second layer formed by roving in a 90 ° direction is basically used. There is a layer sheet substrate, and in the present invention, this biaxial two-layer sheet substrate can be used, of course, the biaxial bilayer sheet substrate has a third layer formed by roving in the 0 ° direction. Various multiaxial multi-layer sheet base materials (sometimes referred to as “multi-axis stitch base materials”) such as laminated biaxial three-layer sheet base materials can be used. According to this multiaxial multilayer sheet base material, since each roving is arranged linearly, a gap extending in the 0 ° direction is formed in the first layer formed by roving in the 0 ° direction, and 90 ° A gap extending in the 90 ° direction is formed in the second layer formed by directional roving. For example, there is a plain weave roving cloth composed of 0 ° direction roving and 90 ° direction roving, which is compared with the multiaxial multilayer sheet base material. And a 90 ° -direction roving are alternately woven one by one. Therefore, the multiaxial multilayer sheet base material is that the gaps between the rovings are many small squares. It is greatly different from (biaxial two-layer sheet base material).

  In a multiaxial multilayer sheet base material, there is a gap between adjacent rovings in any layer, and the resin flow can be improved by using this gap as a resin passage in accordance with the resin flow direction. Usually, the resin is introduced from, for example, 90 ° away from the two cylindrical protrusions, and protrudes cylindrically from the base end part of the cylindrical protrusion part (joining part with the ring-shaped main body) toward the distal end part. Corresponding to this, the multiaxial multilayer sheet base material is made so that the roving length direction of any layer is parallel to the axial direction of the cylindrical protrusion. Is laminated.

  The reinforcement by the multiaxial multilayer sheet base material secures a necessary amount of glass fiber and imparts a function as a resin passage, whereby the resin flow failure can be greatly improved.

  As the resin, unsaturated polyester, vinyl ester, epoxy, phenol and the like can be used as appropriate.

A butterfly valve valve box according to the present invention is a glass fiber reinforced resin butterfly valve box manufactured by the above method for manufacturing a butterfly valve valve box, and is a glass base for reinforcing a shaft hole for inserting a valve rod. The material includes an inner reinforcing layer that forms an inner peripheral surface of the shaft hole, an intermediate reinforcing layer that is disposed on the outer side and fills between the grooves and between the grooves and both ends of the valve stem support portion, and further The intermediate reinforcing layer is divided into an outer reinforcing layer disposed on the outer side, and the intermediate reinforcing layer includes a first layer in which the rovings are arranged at predetermined intervals in a direction orthogonal to the length direction, and the rovings are orthogonal to the first roving. A multiaxial multilayer sheet base material in which two or more layers including the second layer arranged so as to be integrated by stitch yarns, the multiaxial multilayer sheet base material includes the first layer and the first layer The length direction of one of the two layers of roving is the axial direction of the shaft hole And it is characterized in that it is directed in a direction parallel to.

According to the method for manufacturing a molded product and the method for manufacturing a valve box for a butterfly valve according to the present invention, a butterfly valve as an example of a large-diameter glass fiber reinforced resin molded product and a large-diameter glass fiber reinforced resin molded product When manufacturing the valve box, the necessary amount of glass fiber can be secured and the resin flow failure can be improved.

FIG. 1 is a perspective view showing a valve box for a butterfly valve, which is an example of a molded product targeted by the present invention. FIG. 2 is a perspective view showing a method for manufacturing a molded article and a method for manufacturing a valve box for a butterfly valve according to the present invention. FIG. 3 is a cross-sectional view schematically showing the main part of the valve box for a butterfly valve according to the present invention. FIG. 4 is a view showing an example of a glass substrate used in the method for producing a molded article and the method for producing a valve box for a butterfly valve according to the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a glass fiber reinforced resin butterfly valve valve box which is an example of a molded article targeted by the present invention. The butterfly valve valve box (1) is fitted with a seat ring (5). An annular groove (2a) has a ring part (2) formed on the inner periphery, and a valve stem support part (3) provided integrally at two positions displaced by 180 ° of the ring part (2). . A shaft hole (4) for inserting a valve stem is formed in the valve stem support (3), and two annular O-ring grooves (6) for mounting an O-ring are provided in the shaft hole (4). Is formed.

The method for producing a molded product and the method for producing a valve box for a butterfly valve according to the present invention are for producing the butterfly valve valve box (1) as the glass fiber reinforced resin molded product by a vacuum injection molding method.

  In the vacuum injection molding method, after the glass substrate is placed in the mold, the mold is assembled, and the resin that has been stirred by adding a curing agent is injected into the mold, and the air in the mold is sucked and molded. A molded article is obtained by impregnating a glass substrate placed in a mold with a resin and curing it at room temperature.

  As shown in Fig. 2, the mold (inner mold) (11) for molding the valve box (1) for the butterfly valve has a ring shape and forms two shaft hole (4) for inserting the valve stem. It has a cylindrical protrusion (12) for this purpose. As shown in FIG. 3, two cylindrical ring portions (13) having a square cross section for forming an O ring groove (6) having a square cross section are attached to the cylindrical protrusion (12).

  In the glass base material arranging step for manufacturing the valve box (1) for the butterfly valve, first, a glass base material for reinforcing the valve stem support portion is attached to the cylindrical protrusion (12) provided in the mold (11). Then, a glass substrate for reinforcing the ring part is laminated on the outer periphery of the mold (11) excluding the cylindrical protrusion (12).

The method for manufacturing a molded article and the method for manufacturing a valve box for a butterfly valve according to the present invention are characterized by a process of laminating a glass base material for reinforcing a valve stem support, and a mold (11) including an annular ring portion (13) A step (FIG. 2 (a)) for forming an impregnation roving layer (21) as an inner reinforcing layer of the valve stem support portion (3) by winding the impregnation roving around the cylindrical protrusion (12) Multiaxial multilayer sheet base material lamination that becomes an intermediate reinforcing layer of the valve stem support part (3) by winding the multiaxial multilayer sheet base material (24) so as to eliminate the step formed by the part (13) A valve stem by winding a glass substrate so as to cover the step of forming the portion (22) (FIG. 2 (b)) and the impregnated roving layer (21) and the multiaxial multilayer sheet substrate laminate portion (22) A step of forming the outer reinforcing layer (23) of the support portion (3) (FIG. 2C).

  Since the valve rod that receives the water pressure of the valve element is inserted into the shaft hole (4) for inserting the valve rod, the periphery of the shaft hole (4) is subjected to a large force, and the glass content is reduced. It is preferable to increase. In such a case, it is common to wrap the roving so as to have a large number of layers, but if the thickened portion like the valve stem support (3) is reinforced in this way, there is strength. , Impregnation is not good. In order to improve the impregnation property, for example, a sheet base material such as a continuous mat may be laminated. In this case, the impregnation property is excellent, but the glass content is lowered, and therefore the ratio of the resin is reduced. As a result, the dimensional change due to resin shrinkage is likely to occur.

Therefore, in the method for manufacturing a molded article and the method for manufacturing a valve box for a butterfly valve according to the present invention, an impregnation roving is used as the glass substrate of the inner reinforcing layer (21) of the valve stem support portion (3), and the impregnation roving layer As shown in FIG. 3, (21) is a portion (21a) provided on the outer peripheral surface of the cylindrical protrusion (12), a portion (21b) provided on the outer peripheral surface of the annular ring portion (13), and an annular shape. It is assumed that the ring portion (13) includes portions (21c) provided on both side surfaces. Thereby, the resin flow defect in the inner peripheral surface of the shaft hole (4) is improved.

Furthermore, in the method for manufacturing a molded article and the method for manufacturing a valve box for a butterfly valve according to the present invention, a biaxial multilayer sheet base material (multiaxial multilayer sheet) is used as the intermediate reinforcing layer (22) of the valve stem support portion (3). One example of the base material (24) is used, and one axis of the biaxial multilayer sheet base material (24) (the length direction of the roving of any layer) is the axis of the cylindrical protrusion (12) It arrange | positions so that it may become parallel to a direction.

  As shown in FIG. 4, the biaxial multilayer sheet substrate (24) includes a first layer (31) in which rovings (31a) in the 0 ° direction are arranged at predetermined intervals in a direction perpendicular to the length direction. The two layers including the second layer (32) arranged so that the roving (32a) in the 90 ° direction is orthogonal to the roving (31a) of the first layer (31) are integrated by the stitch yarn (33). As such a biaxial or multiaxial multilayer sheet base material, for example, there is a trade name “Amirasu Flow” (manufactured by Nittobo Co., Ltd.).

In the biaxial multilayer sheet base material (24), there is a gap (G) between adjacent rovings in any layer (31) (32), and this gap (G) is aligned with the resin flow direction so that the resin path As a result, the resin flow can be improved. Specifically, the resin is introduced at a position 90 ° away from the two cylindrical protrusions (12), and the distal end of the cylindrical protrusion (12) from the base end (joining portion with the ring-shaped main body). The length direction of the roving (32a) of the second layer (32) corresponds to the axial line of the cylindrical protrusion (12), corresponding to the flow in the direction parallel to the axial direction of the cylindrical protrusion (12). A biaxial multilayer sheet base material (24) is arranged so as to be parallel to the direction.

  In addition, the thickness of the roving (31a) (32a) of the biaxial multilayer sheet base material (24) used may be the same between the first layer (31) and the second layer (32) or different. It may be. Then, when the thickness of the roving (31a) (32a) is different, the length direction of the roving (31a) of the thin roving layer (31) is made parallel to the axial direction of the cylindrical protrusion (12). Alternatively, the length direction of the roving (32a) of the thick roving layer (32) may be parallel to the axial direction of the cylindrical protrusion. The biaxial multilayer sheet base material is not limited to two layers, and may be three or more layers. When using a biaxial multilayer sheet base material having three or more layers, the length direction of at least one layer of roving is made parallel to the axial direction of the cylindrical protrusion.

  As shown in FIG. 3, a roving (25) is used as the outer reinforcing layer (23) of the valve stem support (3), and between the roving (25) layer and the roving (25) layer. The biaxial multilayer sheet base material (26) is disposed. The biaxial multilayer sheet base material (26) can be omitted, and a long fiber mat (continuous mat) can be used instead of or in combination with the roving (25).

  The valve stem support part (3) of the valve box (1) for the butterfly valve thus obtained has an inner peripheral surface of the shaft hole (4) corresponding to the type of the reinforcing glass substrate as shown in FIG. The inner reinforcing layer (21) forming the outer ring and the outer ring laminated between the O-ring groove (6) and the O-ring groove (6) and both ends of the valve stem support (3) from the O-ring groove (6) It is divided into an intermediate reinforcing layer (22) that fills the space between the outer reinforcing layer (23) and the outer reinforcing layer (23) arranged on the outer side. An intermediate reinforcing layer (22) is formed by a biaxially laminated sheet base material (24), and an outer reinforcing layer (23) is a plurality of roving layers (25) and a plurality of multiaxial multilayer sheet base material layers. (26). As a result, the valve stem support portion (3) of the butterfly valve valve box (1) is provided with sufficient strength by the glass base material, and the resin flow during molding is good. The strength reduction of the rod support portion (3) is prevented.

(1) Valve box for butterfly valves (molded product)
(2) Ring part
(2a) Annular groove
(3) Valve stem support
(4) Shaft hole for valve stem insertion
(5) Seat ring
(6) O-ring groove
(11) Mold
(12) Cylindrical protrusion
(13) Annular ring
(21) Impregnation roving layer (inner reinforcement layer)
(22) Multiaxial multi-layer sheet base material laminate (intermediate reinforcing layer)
(24) Multiaxial multilayer sheet base material
(31) First layer
(31a) Roving
(32) Second layer
(32a) Roving
(33) Stitch yarn

Claims (5)

It has a ring part in which an annular groove is formed on the inner periphery, and a support part provided integrally at a required portion of the ring part. A through-hole shaft hole is formed in the support part, and the circumferential direction is formed in the shaft hole. A method for manufacturing a glass fiber reinforced resin molded product having a circumferential groove extending by a vacuum injection molding method, comprising a cylindrical projection for forming a support, and a cylindrical projection A ring-shaped mold provided with an annular ring portion for forming a circumferential groove on the outer periphery of the mold, and the impregnated roving layer is formed by winding the impregnated roving around the cylindrical protrusion with the annular ring portion of the mold The manufacturing method of the molded article characterized by including the process to form. After the step of forming the impregnated roving layer, the method further includes a step of winding the multiaxial multilayer sheet base material so as to eliminate the step generated by the annular ring portion to form a multiaxial multilayer sheet base material laminated portion, In this step, the multiaxial multilayer sheet base material is arranged so that the length direction of the roving of any one of the layers is parallel to the axial direction of the cylindrical protrusion. Manufacturing method of molded products.   An annular groove for mounting a seat ring has a ring portion formed on the inner periphery, and a valve rod support portion integrally provided at two positions displaced by 180 ° of the ring portion. A method of manufacturing a glass fiber reinforced resin butterfly valve valve box, in which a shaft hole for insertion is formed and an O-ring groove for mounting an O-ring is formed in the shaft hole by a vacuum injection molding method. , Using a ring-shaped mold having a cylindrical protrusion for forming a valve stem support, and provided with an annular ring portion for forming an O-ring groove in the cylindrical protrusion. A method for manufacturing a valve box for a butterfly valve, comprising the step of forming an impregnated roving layer by winding an impregnated roving around a cylindrical projection with an annular ring portion of a mold. After the step of forming the impregnated roving layer, the method further includes a step of winding the multiaxial multilayer sheet base material so as to eliminate the step generated by the annular ring portion to form a multiaxial multilayer sheet base material laminated portion, in this step, Tajikufukuso sheet substrate, according to claim 3, characterized in that the length direction of the roving of any of the layers are arranged in parallel with the axial direction of the cylindrical projection A method for manufacturing a valve box for a butterfly valve. A butterfly valve valve box made of glass fiber reinforced resin manufactured by the method for manufacturing a butterfly valve valve box according to claim 4,
  The glass base material that reinforces the shaft hole for inserting the valve stem is composed of an inner reinforcing layer that forms the inner peripheral surface of the shaft hole, and an outer side of the groove between the grooves and from the groove to both ends of the valve stem support part. The intermediate reinforcing layer is further divided into an intermediate reinforcing layer and an outer reinforcing layer disposed outside the intermediate reinforcing layer, and the intermediate reinforcing layer is arranged at a predetermined interval in a direction perpendicular to the longitudinal direction of the roving. The multiaxial multi-layered sheet base material comprising two layers or more including one layer and a second layer in which the roving is arranged so as to be orthogonal to the first roving is formed by stitch yarns. The multi-layer sheet base material is characterized in that the length direction of the roving of either the first layer or the second layer is oriented in a direction parallel to the axial direction of the shaft hole.