JPH045298Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a joint mold used for joint molding by resin injection molding (hereinafter referred to as RI).

Most of the conventional RI products are large-capacity molded products such as large aquariums and tanks, and the preform of the molded product is molded from glass fiber, which is then placed in a mold and thermosetting resin is injected from the outside of the mold. After injecting resin into the preform and curing it, the mold is opened and the product is taken out.
The joint mold for this purpose is different in structure from the mold for molding large products such as those mentioned above.Glass fiber is wound around the outside of the joint molded with thermoplastic resin, and this semi-finished joint is It is placed in a mold and a thermosetting resin is injected, and this resin is used to create a joint made of glass fiber and thermoplastic resin (hereinafter referred to as "resin joint").
In addition, the resin joint is formed with a reinforced plastic layer formed of glass fiber and thermosetting resin to increase the strength of the resin joint.

That is, the gist of the present invention is to include a cavity portion for accommodating a semi-finished joint in which glass fiber is wound on the outside of a curable resin thermoplastic resin joint, and a plug member to be fixed to a socket portion of the semi-finished joint. The outer edge groove was formed in a continuous manner, and this cavity part was divided into upper and lower halves, and the upper mold was provided with a gate communicating with the outside, so that thermosetting resin was injected into the cavity part through this gate. This invention resides in a joint mold for resin injection extension, which is characterized in that it molds an FRP joint with stable quality.

Hereinafter, the present invention will be explained in detail based on examples.

FIG. 1 shows a plan view of a mold for an elbow joint.

The lower mold 2 is provided with a cavity part 3 in the center to accommodate the lower half of the semi-finished elbow joint L for winding glass fiber on the resin joint, and this cavity part 3 is provided at both ends to accommodate the lower half of the plug member 5. A rubber gasket 7 is provided on the outside of the cavity portion 3.
A sealing groove 6 is provided in which a guide member 8, 8, 8, 8, and
is erected, and its tip protrudes upward from the upper surface 2a of the lower mold 2. Furthermore, bases 10, 10 for fixing the clamp 9 are provided at diagonally opposite corners.
The upper die 1 is provided with a cavity 3' for accommodating the upper half of the semi-finished elbow joint L and an outer edge groove 4' for accommodating the upper half of the plug member 5 at a position facing the lower die 2. A protrusion 11 for pressing the rubber gasket 7 is provided at a position facing the seal groove 6, and a gate 12 is opened so as to communicate with the center of the cavity portion 3', and a plug 13 is inserted into the gate 12. It is formed like this. Also, the outer left of the upper mold 1,
Fix the presser plate 14 at two places on the right side and press the base 1 of the lower mold 2.
The upper mold 1 is pressed against the lower mold 2 by pressing the tip end press-contacting portions 9' of the clamps 9 attached to the clamps 14 and 10 against the pressing plates 14, 14 to join the upper mold 1 to the lower mold 2.
In the figure, 15 and 16 are grooves into which seal packings are fitted.

When forming FRP elbow joints by RI,
First, plug members 5 are inserted and fixed into both sockets of the semi-finished elbow joint L to prevent the thermosetting resin from flowing into the sockets, and then the elbow joint L is inserted into the cavity part 3 of the lower mold 2 and into the outer edge groove. Put it within 4.

At this time, the part of the semi-finished elbow joint L is accommodated in the cavity part 3, and the part of the plug member 5 is accommodated in the outer edge groove 4. At this time, the outer diameter of the plug member 5 is Because it is larger, the plug member 5,
5 is properly accommodated in the outer edge groove 4, the two plug members 5, 5 support and fix the elbow joint L horizontally within the cavity portion 3. That is,
Since the cavity part 3 is made slightly larger than the outer diameter of the semi-finished elbow joint L, the elbow joint L is supported horizontally at the center of the cavity part 3, and the entire circumference of the cavity part 3 and the outer circumference of the elbow joint L are supported horizontally at the center of the cavity part 3. It is possible to make all the gaps with the surface equal intervals, and it is possible to uniformly flow the thermosetting resin into these gaps. Next, after placing the semi-finished elbow joint L on the lower mold 2, the upper mold 1 is lowered from above, but at this time,
Place the lower end of the upper mold 1 inside the guide members 8, 8, 8, 8, which stand up from the lower mold 2, and lower it gently to place the semi-finished product in the cavity 3' and the outer edge groove 4 of the upper mold 1. After the upper half of the elbow joint L is accommodated, the clamp 9 is operated to remove the holding plate 14 of the upper die 1,
14 is pressed downward using the tip pressure contact portion 9' of the clamp 9. At this time, the protrusion 11 projecting to the inner surface of the upper mold 1 presses the rubber gasket 7 in the seal groove 6 of the lower mold 2 to seal the cavity parts 3, 3'.

After joining the upper mold 1 and the lower mold 2, a predetermined amount of thermosetting resin is injected through the gate 12 of the upper mold 1 to impregnate it into the glass fiber of the semi-finished elbow joint L, and the cavity portion 3, After the thermosetting resin is filled in the thermosetting resin 3', the plug 13 is quickly inserted into the gate 12 and hardened. After curing is completed, the clamp 9 is released, the upper mold is pulled upward, and the FRP joint inside the cavity part 3 is taken out.

In addition, in the case of a mold for forming a cheese joint in addition to an elbow joint, plug members are fixed to the sockets on three sides of the cheese joint, and the half-finished cheese joint is placed inside the cavity formed in a T-shape. All you have to do is set the outer edge grooves in three places to accommodate the plug members, and
By firmly fixing this plug member inside the cavity, the gap between the outer peripheral surface of the semi-finished cheese joint and the inner surface of the cavity is made uniform over the entire surface, allowing the resin to flow smoothly and ensuring that the product has a uniform wall thickness. form so that it can be transformed into In addition, the means of the present invention can be applied to all kinds of joint molds such as socket joints and cruciform joints.

As mentioned above, the joint mold of the present invention can provide a mold for an unprecedented quantity, and it does not require thermosetting resin to flow into the joint and does not require finishing of the socket. Since the member 5 supports the semi-finished joint horizontally within the cavity and forms a uniform gap between the cavity and the semi-finished joint, the thermosetting resin flows uniformly and there is no change in wall thickness. Since the curing time is also averaged, it is possible to form FRP joints with stable quality.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a mold for an elbow joint showing an embodiment of the present invention, Fig. 2 is a side view of Fig. 1, Fig. 3 is an end view taken along the line A-A of Fig. 1, and Fig. 4 is a FIG. 5 is a side view of the plug member attached to the semi-finished joint, FIG. 5 is a plan view of the plug inserted into the gate portion of the upper mold, and FIG. 6 is a plan view of the semi-finished elbow joint. 1... Upper die, 2... Lower die, 4... Outer edge groove, 5
... Plug member, 6 ... Seal groove, 12 ... Gate,
13...stop.

Claims (1)

[Scope of utility model registration request] A cavity part for accommodating a semi-finished joint in which glass fiber is wound around the outside of the thermoplastic resin joint, and an outer edge groove for accommodating a plug member fixed to a socket part of the semi-finished joint are formed in a continuous manner, A joint for resin injection extrusion, characterized in that the cavity is divided into upper and lower halves, and the upper mold is provided with a gate communicating with the outside so that thermosetting resin is injected into the cavity through the gate. Mold.