JPH0146295B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a method for molding an FRP flanged socket used for piping in hot springs 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 injecting 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 little disclosure of methods for molding flanged sockets made of synthetic resin that can withstand high-temperature water of 100°C or higher and acid/alkaline solutions, and in particular, no method of continuous molding of sockets with flanges made of FRP has been disclosed at all. do not have.

(Object of the Invention) The present invention has been made in view of the above circumstances, and its purpose is to provide a resin in-jet extension method that can simultaneously produce a large number of FRP flanged sockets with excellent water resistance and chemical resistance. The purpose of the present invention is to provide a continuous molding method.

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

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. First, a prototype C is prepared by wrapping a glass fiber 2 to the required thickness around the outer circumferential surface of a flanged socket (hereinafter referred to as "socket") 1 made of vinyl chloride resin, which has excellent heat resistance and chemical resistance. The original form C is fixed in a mold B as shown in FIG.

The mold B is divided into an upper mold 3 and a lower mold 4. The lower mold 4 is provided with a cavity 5 having a shape slightly larger than the outer shape of the original form C, and a thermosetting mold is provided between the cavity 5 and the original form C. A gap 6 is provided through which the synthetic resin flows. Further, on the mating surface 3a of the upper mold 3, when the original mold C is set in the cavity 5 of the lower mold 4, a rubber sealing material 18a and a flange portion are attached along the entire circumference of the flange portion f of the original mold C. A rubber sealing material 18b that fits along the entire periphery of the bolt insertion hole 13 formed at f is fitted into the annular grooves 15 and 16 so as to form a uniform surface with the mating surface 3a, respectively.
In addition, a rubber sealing material 18c surrounding the entire circumference of the cavity 5 is fitted into the annular groove 17 on the mating surface 4a of the lower mold 4 so as to protrude from the mating surface 4a, thereby bringing the upper mold 3 and the lower mold 4 together. In this state, a gap T is maintained between the upper die 3 and the lower die 4 by the rubber sealing material 18c, and the cavity 5 is sealed with the rubber sealing material 18c via the peripheral edge spacing portion t, and the flange portion f The periphery of the bolt insertion hole 13 and the periphery of the bolt insertion hole 13 are sealed with rubber sealants 18a and 18b.

Further, an arc-shaped runner 7 is formed on the mating surface 3a of the upper mold 3 along the periphery of the cavity 5, and a gate portion 8 is opened in the upper surface so as to penetrate through the center of the runner 7. The gate portion 8 communicates with the gap 6 via the runner 7 and the peripheral spacing portion t.

In addition, the lower die 4 is formed with an ejection opening 10 that penetrates from the bottom surface to the bottom surface of the cavity 5.
A receiving core 12 that serves as a support for the original form C is fitted into the bottom of the cavity 5 so as to be movable up and down, and a ring-shaped member is provided on the upper surface of the receiving core 12 to seal between it and the tip of the socket part s of the original form C. Rubber seal material 18
d 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.
A guide core 14 that is removably fitted into the mold 3 is disposed to protrude into the cavity 5, and the guide core 14 is fixed to the lower mold 4 with a fixing bolt 20.

Therefore, when the thermosetting resin R is injected from the gate part 8, the thermosetting resin R flows through the runner 7 in the left and right circumferential direction, and spreads out into the cavity 5 in a planar shape from the circumferential interval part t. into the original form C
and the cavity 5, flowing down into the gap 6,
is filled with thermosetting resin R.

After filling the thermosetting resin R, a stopper 9 having a shape as shown in FIG. 3 is quickly inserted into the gate part 8 to prevent the resin R from flowing back, and the resin R is allowed to harden as it is.

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. Alternatively, a room temperature curing agent can be mixed into the thermosetting resin R and the resin R can be cured at room temperature.

After curing is completed, the upper mold 3 is opened, the receiving core 12 is ejected upward from the ejection opening 10 formed in the lower mold 4 using the ejecting pin 11, and the FRP flanged socket A is ejected upward from 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 example, the diameter
It was molded using a hole in which 17 mm bolt insertion holes 13 were formed at four locations.

During molding, as shown in FIG. 2, while inserting the bolt insertion hole 13 of the flange part f into the guide core 14 protruding into the cavity 5 of the lower die 4, the socket part s of the original form C is turned downward. insert it, place the tip end surface of the socket part s against the upper surface of the receiving core 12,
The upper mold 3 is closed so that the flange portion 1b is held horizontally, and the thermosetting resin R is press-fitted through the gate portion 8 as described above.

In this way, the FRP flanged socket A reinforced with the reinforced plastic layer is molded. FRP reinforced with a reinforced plastic layer.
Socket A with flange weighs 100kg/in 100℃ hot water.
It showed a breaking water pressure of ^more than cm2.

(Effects of the Invention) As explained above, according to the molding method of the present invention, a flanged socket wound with glass fiber is used as a master shape, this master shape is put into a mold, and a thermosetting resin is poured from a gate part. This resin is impregnated into glass fibers and fixed to the original shape, and the outer surface is made of thermosetting resin to give it a mirror-like shine.
FRP flanged sockets can be molded. The molding cycle for a socket with a thermoplastic resin flange can be completed by using several molds and automatically injecting thermosetting resin from the gate of the mold using a thermosetting resin injection machine. It has become possible to perform continuous molding in approximately the same amount of time.

In addition, the molded joints have a glossy appearance and a good feel, and the glass fibers do not shift to one another, so 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 resin flanged socket, it can be connected to FRP pipes (core material made of vinyl chloride or ABS resin) using adhesive, making piping easy and corrosion-free. Because of this, it can be used for long periods of time in plant piping, hot spring piping, etc. Furthermore, according to the method of the present invention, FRP flanged sockets can be continuously produced using flanged sockets of various sizes, making it easy to assemble the product, and can be expected to have great practical effects.

[Brief explanation of drawings]

Fig. 1 is a plan view of the lower die of the mold used in the molding method of the embodiment of the present invention, Fig. 2 is an explanatory diagram of the molding method of the flanged socket of the present embodiment, and Fig. 3 is a diagram showing the method of molding the flanged socket of this embodiment. FIG. 4 is a front view of the stopper and a partially cutaway perspective view of the FRP flanged socket molded by the molding method of this embodiment. A: Socket with FRP flange, B: Mold,
1: Socket with flange, 2: Glass fiber, 3:
Upper mold, 4: Lower mold, 5: Cavity, 8: Gate,
R: Thermosetting resin.

Claims (1)

[Claims] 1 After inserting the original shape with glass fiber wound around a flanged socket made of vinyl chloride into the cavity of a mold divided into an upper mold and a lower mold, thermosetting resin is injected from the gate part, and the cavity surface is By the resin injecting method, which is characterized by press-fitting a thermosetting resin into the gap between the glass fiber and the original shape, and impregnating and hardening the thermosetting resin into the glass fiber of the original shape.
How to mold FRP sockets.