JPH05278047A - Manufacturing equipment for synthetic resin product - Google Patents

Abstract

PURPOSE:To manufacture a synthetic resin product containing FRP (fiberglass reinforced plastics) in an easy manner by providing molding devices in which a pair of molds can move, means for spraying a gelcoat resin against an inner surface of the mold, and means for supplying required mixed liquid into the mold, and incorporating a heating means in the mold. CONSTITUTION:In a molding device 1, a plurality of roller conveyors are provided on a frame so that the running surfaces thereof are flush with each other. Above the right and left roller conveyors, lifting cylinders 2, 3, upper molds 5b, 6b, and lower molds 5a, 6a are provided, respectively. Above the center roller conveyor, a depressing cylinder 4 is provided. In each of the molds 5a-6b, a heating element is incorporated. Furthermore, on one side of the molding devices 1, a resin tank 8a and a curing agent tank 8b are disposed. A pump 8c, plugs 8e, and the like are connected to said tanks. On the other side of the molding devices 1, a gelcoat resin tank 9a is disposed. A pump 9c, spray nozzles 9d, and the like are connected to said tank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for manufacturing synthetic resin products containing glass fiber reinforced plastic.

[0002]

2. Description of the Related Art Glass fiber reinforced plastic (hereinafter,
For manufacturing synthetic resin products containing "FRP" as a reinforcing agent, upper and lower molds are prepared, and after the FRP is set and clamped in the creation space of these molds, for example, thermosetting of unsaturated polyester resin or the like is performed. From the step of adding a curing agent to a volatile resin and injecting it under pressure into a mold, a method of releasing the product after curing the resin is generally adopted.

Further, in order to color the surface of the synthetic resin product produced in the mold, at the stage of preparing the mold before injecting the resin, the liquid phase gel coat resin for coloring is sprayed on the inner surface of the product and then heated. It is also customary to cure and color the product with this gel coat resin.

In a line for producing such a synthetic resin product reinforced with FRP by mold production, the upper and lower molds are maintained, a mold release agent is applied to the inner surface thereof, and a gel coat resin is applied and cured on the inner surface of the mold. , FRP setting and mold clamping, mixed injection of resin and its curing agent, curing and mold release are required respectively. For this reason, the conventional general equipment is one in which lines are arranged in a loop and stations for performing these operations are arranged.

[0005] In such equipment, depending on the size of the product, a conveyor for carrying the mold is arranged around each station, and the conveyor is mechanically driven to carry the mold or work. The person will move the mold and process it.

[0006]

However, the processing time of the mold or the product at each station of the manufacturing line is often not the same. Therefore, when the conveyor is driven, not only the equipment cost is increased, but also control of traveling speed and intermittent operation is required, and maintenance and inspection are likely to be complicated.

Further, after the mold is opened after the resin is cured, in order to smooth the surface of the resin and prevent the glass fiber of FRP from being lifted up, when the liquid phase gel coat resin is sprayed on the surface of the product, this gel coat resin is used. It is necessary to cure. For this reason, after the mold is opened and the gel coat resin treatment is performed, it is fed into a curing chamber in a temperature atmosphere of 50 to 60 ° C. The curing chamber needs to have a relatively large internal volume in order to have a heating atmosphere, and the volume of the line also increases accordingly. For this reason, in the case of a facility for transferring the mold by the worker, the transfer distance of the mold becomes long, and the work load is severe.

Further, since the mold runs along the entire length of the line and the curing chamber for curing the gel coat resin is provided, the working environment at the time of molding is poor.

[0009] The problem to be solved in the present invention is to reduce the burden on the operator and to make a mold for an FRP product with simple equipment.

[0010]

According to the present invention, there is provided a molding unit in which a pair of molds can be moved between a mold release position and a resin pressure injection position, and an inner surface of the pair of molds before pressure molding. A spraying means for spraying a gel coat resin for coloring on, and a supply means for supplying a mixed liquid of a thermosetting resin and its curing agent to the creation space inside the pair of molds, each of the molds, It is characterized in that a heating means for curing the gel coat resin is provided.

[0011]

Since the work of releasing the mold and pressing the resin can be performed in one molding unit, it is not necessary to flow the mold on the line in the order of steps, and even if the equipment is used to move the mold manually to advance the work. Therefore, the work load can be reduced. Further, since the mold itself is provided with a heating means, even if the inner surface of the mold is sprayed with the gel coat resin for product coloring in the preparatory stage before the resin is injected, the mold can be heated and cured as it is, and the mold can be heated in a high temperature atmosphere. It is no longer necessary to equip the line with a curing chamber. Furthermore,
If you keep the mold at almost constant temperature by heating means,
It can also be used for curing thermosetting resins, and enables stable mold production of synthetic resin products.

[0012]

1 is a schematic view showing an embodiment of a plane layout of a synthetic resin product manufacturing facility of the present invention.

In the figure, a plurality of molding units 1 for arranging FRP, filling resin, press-molding, and curing after gel-coat resin treatment are arranged. In the illustrated example, the molding unit 1 is formed by arranging four stations, and the respective configurations are the same.

FIG. 2 is a schematic front view of the molding unit 1.

The molding unit 1 is provided with a frame 1a fixed to the factory floor, and roller conveyors 1b, 1c, 1d are arranged at the bottom, left and right sides, and in the center thereof so that their running surfaces coincide with each other. Elevating cylinders 2 and 3 are arranged above the left roller conveyor 1b and the right roller conveyor 1c, respectively, and a pressure reducing cylinder 4 for pressure molding is provided above the central roller conveyor 1d.

The roller conveyors 1b to 1d can be driven by an electric motor (not shown), or the rollers can be simply rotatably arranged. In the case of the drive type, a control system that can operate in association with the operation of the lifting cylinders 2 and 3 and the reduction cylinder 4 may be assembled. Further, the left and right roller conveyors 1b and 1c are supported by the support 1e,
It is rigidly supported by 1f and the central roller conveyor 1d
Is a buffer support 1g in preparation for reduction by the reduction cylinder 4.
Shall be supported by.

The roller conveyor 1b on the left side and the roller conveyor 1c on the right side perform pressure molding by the pressure reduction cylinders 4 in sequence with each other so that pressure molding can be continued even during mold release and mold maintenance. A mold and a lower mold are arranged. In the illustrated example, the left roller conveyor 1b is provided with a lower die 5a and an upper die 5b, and the right roller conveyor 1c is similarly provided with a lower die 6a and an upper die 6b.

These lower molds 5a and 6a reciprocate between the roller conveyors 1b and 1c, which are their bases, and the central roller conveyor 1d. Also, the upper molds 5b and 6b
Are provided with pins 5b-1 and 6b-1 on the respective outer peripheral surfaces at two positions in the width direction, and these bifurcated hooks 2a and 3a of the lifting cylinders 2 and 3 are provided with these pins 5b-1 and 6b-.
1 is removable.

Further, the lower mold and the upper molds 5a to 6b are all made of metal, and a heating element 7 such as a tubing heater is integrally incorporated therein. The heating element 7 is integrally formed when the lower die and the upper die 5a to 6b themselves are produced by die production, or each die is machined after die production to form holes, grooves and the like. Shall be incorporated. Then, the heating element 7 is energized intermittently by a temperature controller such as a bimetal switch incorporated in the central portion of the lower mold and the upper molds 5a to 6a. The entire upper molds 5a to 6a are maintained so as to have a substantially uniform temperature distribution. Thus, the lower mold and the upper mold 5a-
By keeping 6a at a constant temperature, it becomes possible to accelerate the curing of the gel coat resin and the curing of the thermosetting resin during mold production, regardless of the outside air temperature.

Returning to FIG. 1, such a lower die and an upper die 5a.
4 sets of molding units 1 each including .about.6b are arranged, and molding of the synthetic resin product containing FRP is independently performed in each molding unit 1. With respect to the layout of the molding unit 1, equipment for filling the resin and spraying the gel coat resin after releasing the mold is attached to all the molding units 1 as common equipment.

A resin tank 8a and a hardening agent tank 8b for respectively storing a thermosetting liquid phase synthetic resin and a hardening agent are arranged on the left side of the row of the molding units 1. The resin tank 8a and the curing agent tank 8b are connected to a pump 8c, and the pump 8c pumps the thermosetting resin in the liquid phase and the curing agent under pressure to send them to each molding unit 1. Cure the resin. Pump 8c
Is connected to a hose 8d directed to each molding unit 1,
Plugs 8e that can be attached to and detached from the injection holes of the upper molds 5b and 6b are provided at the tips of these hoses. This plug 8e
Is provided with a valve for opening and closing the flow path, and the handle 8f allows the valve to be opened and closed.

On the other hand, on the right side of the row of the molding units 1, there is provided a gel coat resin tank 9a for supplying a liquid phase gel coat to the lower and upper dies 5a to 6b which have completed one step of manufacturing. The gel coat resin tank 9a includes a resin tank 8
The pump 9b and the hose 9c are connected in the same manner as in the case of a,
A spray nozzle 9d is attached to the tip of the hose 9c. The spray nozzle 9d is provided with a handle 9e of a valve that opens and closes its internal flow path, and the spray state of the gel coat resin can be changed by adjusting the valve opening degree with this handle 9e.

In the illustrated example, the hoses 8d and 9c are provided to the four molding units 1, respectively, but instead of this, only one hose 8d and 9c is provided to the resin tank 8a and the gel coat resin. Connected to the tank 9a,
It is also possible to supply the resin or gel coat resin in accordance with the manufacturing cycle of the four molding units 1.

2 to 5 will be used to describe the resin molding process using the lower and upper molds 5a to 6b arranged on the left and right of each molding unit 1 in the above-mentioned structure.

FIG. 2 shows two sets of left and right lower and upper dies 5a to 6b.
1 shows the standby state before one molding cycle is completed and the molding is resumed by the lower mold 5a and the upper mold 5b on the left side. In this standby state, the lower mold 5a and the upper mold 5b are serviced, the hose 9c from the gel coat resin tank 9a is extended, and the gel coat resin is sprayed from the spray nozzle 9d to the back surfaces of the lower mold 5a and the upper mold 5b. .. After this spraying, the gel coat resin is cured by the lower mold 5a and the upper mold 5b heated to a constant temperature by the heating element 7, and the creation surface is smoothed.

Thus, by spraying the gel coat resin for coloring at the standby position before injecting the resin and heating the mold itself, the gel coat resin can be cured, and equipment for feeding the mold to the curing chamber as in the conventional case Is not necessary.

After the time for the gel coat resin to harden sufficiently, FRP is laid in a mat shape in the lower mold 5a and the mold is clamped. After that, the hook 2a of the lifting cylinder 2 is lowered as shown by the broken line in the figure, and the upper die 5b is placed on the lower die 5a. Then, the integrated lower mold 5a and upper mold 5b is fed to the central roller conveyor 1d by the roller conveyor 1b and stopped at a fixed position above it.

Then, the hose 8d from the resin tank 8a
The plug 8e is attached to the injection hole of the upper die 5b, and at the same time, the rod 4a of the pressing cylinder 4 is lowered to press down the upper die 5b. By this reduction and injection of the resin mixed with the curing agent, the resin starts to cure in the creation space with the passage of time. The injected thermosetting resin and its curing agent are accelerated in curing because the lower mold 5a and the upper mold 5b are heated by the heating element 7.

Next, the reduction by the reduction cylinder 4 is made 20
After continuing for about a minute, the rod 4a is raised to release the reduction as shown in FIG. Then, as indicated by the broken line in the figure, the lower mold 5a and the upper mold 5b are sent from the roller conveyor 1d to the original roller conveyor 1b side, and are made to stand by at this position until the resin is completely cured.

On the other hand, since the central roller conveyor 1d is empty, preparation for resin injection of the lower mold 6a and the upper mold 6b on the right side, that is, spraying of gel coat resin and heating element 7 is performed.
After the curing is completed, the lower mold 6a and the upper mold 6b are moved from the roller conveyor 1c to the central roller conveyor 1d as shown in FIG. After this, hose 8d
And, the same procedure as injecting the mixed liquid of the resin and the curing agent into the creation space from the plug 8e and the pressure reduction by the pressure reduction cylinder 4 is performed until the injected resin becomes stable.

During the resin injection molding by the lower mold 6a and the upper mold 6b on the right side, the lower mold 5a and the upper mold 6b on the left side, which have already started to be cured, perform the releasing operation at an appropriate time. That is, for the two sets of lower and upper molds 5a and 6b on the left and right,
On the left side and the right side, preparation for molding and mold release and resin injection are carried out mutually, so that the pressure molding by the pressing cylinder 4 does not become intermittent.

The pin 5b-1 of the left upper mold 5b is restrained by the hook 2a of the lifting cylinder 2, and the upper mold 5b is lifted and released from the mold as shown in FIG. Then, if the already cured resin product is extracted from the lower mold 5a and collected, the mold manufacturing of one product is completed. The cycle of the lower mold 6a and the upper mold 6b on the right side is exactly the same.

According to the above procedure, the synthetic resin product is pressure-molded in each molding unit 1. And 1
If the time required to make one time is 20 minutes or more,
Even if four molding units 1 are provided as shown in FIG. 1,
By appropriately shifting the work start time in each molding unit 1, it is possible to manufacture by one or two small number of workers.

Further, as compared with the conventional case where the manufacturing line is looped and the molds are transferred in order of each process, the lower molds and the upper molds 5a to 6b are the central roller conveyor 1d and the left and right roller conveyors 1b. , 1c only needs to be delivered. For this reason, even if the conveyor is not of a drive type, the distance traveled by the worker is shortened, and the work load is greatly reduced.

Further, since the lower mold and the upper mold 5a-5b have the heating element 7 incorporated therein, the gel coat resin is cured by utilizing the heat generated by the heating element 7 after the spraying of the gel coat resin. be able to. Therefore, 1
After the first production of resin products, but before the next production,
It is not necessary to equip the line with a curing chamber in a high temperature atmosphere for curing the gel coat resin. Also, by combining the two sets of work of the lower mold and the upper mold 5a to 6b, when one set is undergoing resin molding, the other set can cope with curing of the gel coat resin, and resin injection and pressure curing can be performed. It is also possible to improve productivity by making only the steps continuous.

[0036]

According to the present invention, by moving the pair of molds in the molding unit, it is possible to perform spraying of the gel coat resin, curing and injection of the resin to release of the mold. Therefore, as compared with the conventional equipment having a loop shape and a curing chamber for the gel coat resin and the like, only the area occupied by the molding unit is required, so that the equipment can be downsized.

Also, since the heating element is incorporated in the mold itself, even when the mold coating is applied to the surface of the mold before injecting the gel coating resin for colorizing the product, the gel coating resin is quickly heated by the heating after the coating. Can be cured. Therefore, the equipment for curing the gel coat resin is not necessary, and the work load is greatly reduced even if the operator transfers the mold.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an arrangement example of molding units in a manufacturing facility of the present invention.

FIG. 2 is a front view of the molding unit, showing a state in which left and right sets of molds are respectively on standby.

FIG. 3 is a diagram showing a process of injecting a resin by pressing down a mold on the left side of the molding unit with a pressing cylinder.

FIG. 4 is a diagram showing a step of returning the mold to its original position after injecting resin into the mold and molding.

FIG. 5 is a diagram showing a process in which a left mold of the molding unit is released and a right mold is injected with resin.

[Explanation of symbols]

 1 Molding Unit 2 Elevating Cylinder 3 Elevating Cylinder 4 Lowering Cylinder 5a, 6a Lower Mold 5b, 6b Upper Mold 7 Heating Element 8a Resin Tank 8b Hardener Tank 8c Pump 8d Hose 8e Plug 9a Gel Coat Resin Tank 9b Pump 9c Hose 9d Spraying Nozzle

Claims (1)

[Claims] 1. A molding unit in which a pair of molds is movable between a mold release position and a resin pressure injection position, and a gel coat resin for coloring is sprayed on the inner surfaces of the pair of molds before pressure molding. A spraying means and a supply means for supplying a mixed liquid of a thermosetting resin and its curing agent to the creation space inside the pair of molds, and for curing the gel coat resin in each of the molds. A facility for manufacturing synthetic resin products, characterized by comprising heating means.