JPS6114920A - Molding method of fiber reinforced plastic flanged socket by resin injection method - Google Patents

Abstract

PURPOSE:To mold the titled socket having the outer surface with luster like mirror surface by a method wherein an original shape consisting in winding glass fiber around a flanged socket is put in a mold and thermosetting resin is poured in the mold so as to impregnate the glass fiber with the resin. CONSTITUTION:An original molding C consisting in winding glass fiber 2 by the required thickness onto the outer peripheral surface of a flanged socket 1 is fixed in a mold B. After that, thermosetting resin R is poured through a gate 8. The resin R flows in a runner 7 so as to divide in the right and left circumperrential directions to spread through a peripheral edge clearance part (t) in a planar form in order to flow into a cavity 5 and flow down in a gap 6, resulting in filling the gap 6 with the thermosetting resin R, which finally hardens itself.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention describes a method for molding an FRP flanged socket used for piping in the hot spring and plant industries that handle high-temperature water and high-temperature acid/alkaline solutions. The present invention relates to a method for molding FRP flanged sockets using a resin injection method for simultaneously and continuously producing a large number of FRP flanged sockets with excellent appearance and physical properties.

(Prior art) Until now, there has been almost no disclosure of a method for molding a socket with 7 runs made of synthetic resin that can withstand high-temperature water of 100°C or higher and acid/alkaline solutions, and in particular, there has been no disclosure of a method for continuous molding of a socket with 7 runs made of FRP. It has not been.

(Object of the invention) The present invention was made in view of the above circumstances, and its purpose is to provide FRP with excellent water resistance and chemical resistance.
The purpose of the present invention is to provide a continuous molding method using the Lennon injection method, which can produce a large number of pieces when molding with Franz.

(Structure of the Invention) That is, in order to achieve this object, in the present invention, glass fiber is wound around a 7-run socket made of vinyl chloride in the cavity of a mold divided into an upper mold and a lower mold. After inserting the original shape, thermosetting resin is injected from the date part, the thermosetting resin is press-fitted into the gap between the cavity surface and the original shape, and the thermosetting resin is impregnated into the glass fiber of the original shape and hardened. We decided to adopt this configuration.

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

First, a socket with a flange made of vinyl chloride resin (hereinafter referred to as "Socket J") 1, which has excellent heat resistance and chemical resistance.
The glass fiber 2 is wound around the outer circumferential surface of the mold to a required thickness to form a prototype C, and this prototype C is fixed in a mold R as shown in FIG.

The mold B is divided into an upper mold 3 and a lower mold 4, and the lower mold 4 includes:
A cavity 5 having a shape slightly larger than the outer shape of the original shape C is provided, and a gap 6 is provided between the cavity 5 and the original shape C into which the thermosetting resin flows.

Further, on the mating surface 3a of the upper mold 3, with the original mold C set in the cavity 5 of the lower mold 4, the 7 run part f of the original mold C is placed.
A rubber sealing material 18m that fits along the entire periphery of the annular groove 15 and a rubber sealing material 18b that fits along the entire periphery of the bolt insertion hole 13 formed in the 7-run no.
．． 16 is fitted into the lower die 4 so as to be flush with the mating surface 3a, and on the mating surface 4a of the lower mold 4, a rubber sealing material 18c that surrounds the entire circumference of the cavity 5 protrudes from the mating surface 4a into the annular groove 17. When the upper mold 3 and the lower mold 4 are fitted in a state where they face each other, the upper mold 3 and the lower mold 4 are sealed together by the rubber sealing material 18c.
A distance T is maintained between the cavity 5 and the cavity 5.
is sealed with the rubber sealing material 18c via the peripheral edge spacing part t, and the peripheral edge of the 7 run part r and the bolt insertion hole 13
The periphery of is sealed with rubber sealing materials 18m and 18b.

Further, an arc-shaped runner 7 is formed on the mating surface 3a of the upper die 3 along the periphery of the cavity 5, and a date portion 8 is opened at the upper surface so as to penetrate through the center of the runner 7. The date pad 8 communicates with the gap 6 via the runner 7 and the peripheral gap t, and the lower mold 4 is formed with an ejection opening 10 that penetrates from the bottom of the cavity 5 to the bottom of the cavity 5. A core 12 is fitted into the bottom of the core 12 so as to be able to move up and down, and a ring is fitted on the top surface of the core 12 to seal between the socket S and the tip of the socket S of the original C. A shaped rubber sealing material 18d is fitted into the annular groove 19. In addition, the bolt insertion hole 1 of the original shape C is provided in the lower mold 4.
The core 14 is removably fitted into the cavity 5.
The guide core 14 is disposed so as to protrude inward, and is fixed to the lower die 4 with a fixing bolt 20.

Therefore, if the thermosetting resin R is injected from the date part 8,
The thermosetting resin R flows through the runner 7 in the left and right circumferential direction, flows into the cavity 5 while developing in a planar shape from the peripheral edge interval t, and flows down into the gap 6 between the original form C and the cavity 5. Then, the gap 6 is filled with the thermosetting resin R.

After filling the thermosetting resin R, quickly fill the date part 8 with the third
A stopper 9 having a shape as shown in the figure is inserted to prevent the resin R from flowing back, and the resin R is allowed to harden.

Various curing methods can be provided, including heating mold B by placing it in a heating device, heating it by having a built-in heater in the mold, or heating it by applying hot air. It is also possible to mix a room temperature curing agent into the thermosetting resin R and cure it at room temperature.

After curing is completed, the upper mold 3 is opened, and the core 12 is ejected from the ejection opening 10 formed in the lower mold 4 using an ejecting bottle 11.
Push out the FRP flange socket A above the lower mold 4. Generally, the wall thickness of the socket 1 differs depending on the size of the pipe and the pressure during use, and the diameter and number of bolt insertion holes also differ, but in this embodiment, the bolt insertion hole 13 has a diameter of 17 rings. Molding was performed using a molded product formed in four locations.

During molding, as shown in FIG.
Insert the socket part S facing downward, place the tip of the socket part S on the upper surface of the socket core 12, close the upper mold 3 so as to hold the run part 1b horizontally, and insert the socket part S as described above. 8
The thermosetting resin R is press-fitted.

FR reinforced with the reinforced plastic layer in this way
This is a molded socket A with a P7 run, and the product has a structure in which a reinforced plastic layer made of glass fiber 2 and thermosetting resin R is integrally formed on the outside of a heat-resistant and chemical-resistant socket 1. Socket A with an FRP flantz reinforced with a reinforced plastic layer showed a breaking water pressure of 100 to 8/cJ or more in hot water at 100°C.

(Effects of the Invention) As explained above, according to the molding method of the present invention, the original shape is a socket with a 7-run hole wound with glass fiber,
This original shape is placed in a mold, thermosetting resin is injected from the date part, this resin is impregnated with glass fiber, and it is fixed to the original shape, and the outer surface is glossy like a mirror with thermosetting resin. It is possible to mold an FRP7 socket Y with a run. In addition, by using several molds and automatically injecting thermosetting resin from the date part of the mold with a thermosetting resin injection machine, the molding cycle is almost equivalent to that of a socket with a thermoplastic resin y flange. It became possible to perform continuous molding in a short period of time.

In addition, the molded joints have a glossy appearance and feel good to the touch, and because the glass fibers do not shift to one side, they exhibit unprecedentedly stable values for water pressure resistance, chemical resistance, and heat resistance.In particular, the inner surface is made of vinyl chloride. Since it is made of a flanged socket made of resin, connection to FRP pipes (type I& whose core material is made of vinyl chloride or ABSII resin) can be made using adhesive, making piping easy. It can be used for long periods of time in plant piping, hot spring piping, etc. as it does not corrode.

Furthermore, according to the method of the present invention, FRP sockets F with 7 runs can be continuously produced using sockets with 7 runs of various sizes, so product lineup can be easily made, and practical effects can be expected to be significant.

[Brief explanation of drawings]

Figure 1 is a plan view of the lower die of the mold used in the molding method of the embodiment of the present invention, Figure 2 is an explanatory diagram of the molding method of the socket with 7 runs of this embodiment, and Figure 3 is inserted into the date part. FIG. 4 is a partially cutaway perspective view of a socket with an FRP flange molded by the molding method of this embodiment. A: FRP socket with flange B: Mold 1: Socket with flange 2 Glass fiber 3: Upper mold 4: Lower mold 5: Cavity 8: Date R: Thermosetting resin

Claims (1)

[Claims] 1) After inserting the original mold made of vinyl chloride flanged socket into which glass fiber is wound into the cavity of the mold which is divided into upper mold and lower mold, thermosetting resin is injected from the date part and the cavity is closed. A method for molding an FRP socket using a resin injection method, characterized by press-fitting a thermosetting resin into the gap between a surface and an original shape, and impregnating and hardening the thermosetting resin into the glass fiber of the original shape.