JPH0692091B2 - Method for producing fiber-reinforced resin molded product - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a fiber-reinforced resin molded product by a spray-up molding method using an industrial robot, and particularly to unmanned and automated production lines. It relates to a suitable manufacturing method.

(Prior Art) Conventionally, as a method of manufacturing a fiber-reinforced resin molded product (hereinafter simply referred to as “molded product”) such as a bathtub, a spray-up molding method using an industrial robot as shown in FIG. 4 is used. It is used. That is, this forming method is performed by cutting a glass roving (hereinafter simply referred to as “roving”) a to a predetermined length and ejecting it as chopped strands (hereinafter simply referred to as “chops”) and a hose g.
Thermosetting resin (hereinafter simply referred to as “resin”)
A spraying device d having a spray gun c for spraying while mixing a curing agent and a curing agent. A device attached to the tip of a robot arm f of a robot e is used to spray resin and curing agent from a spraying port h of the spray gun c. , A chop a ′ is sprayed from a discharge port j of a roving cutter b toward a mold i placed on a turntable k.

(Problems to be solved by the present invention) However, in the above-described conventional technique, when the chop a ′ is ejected from the ejection port j of the roving cutter b,
The chop a ′ adheres to the jet port j due to static electricity,
It may adhere to the ejection port h of the spray gun c together with the resin liquid. Especially when a relatively short chop a ′ of 2 to 10 mm is ejected, it tends to adhere.

When the chops a ′ are thus deposited and accumulated on the jetting ports h and j of the roving cutter b and the spray nozzle c, respectively, the jetting conditions from the spraying device d, for example, the predetermined spraying width and the jetting amount are varied. . Therefore, even if the ejection conditions are set to the same pattern and the spray-up molding is repeatedly performed by the automatic operation of the robot, the sprayed state is different and the molded product having the quality variation is manufactured.

Therefore, the operation of the machine is completely stopped every cycle of molding of the molded product, and after checking the safety device one by one, the safety door of the enclosure fence is opened to enter the operation range of the robot e, and the spray device d is operated. A robot e capable of manually spraying air with an air gun or the like onto the jetting ports h and j of the roving cutter b and the spray gun c to blow off the adhering chops a'and cleaning up spray-up molding. Even if the above is introduced, there is a problem that manpowered operation cannot be performed and the production line cannot be unmanned, since the chop a ′ is cleaned by humans.

The present invention has been made to solve the above problems, and an object thereof is to automatically remove chops adhering to the ejection port of a spray device provided at the tip of a robot arm for production. It is an object of the present invention to provide a method for manufacturing a fiber-reinforced resin molded body which can automate and automate the line.

(Means for Solving the Problems) The present invention is a method for producing a fiber-reinforced resin molded article by spray-up molding in which a mixed liquid of chopped strands and a curable resin and a curing agent is sprayed on the surface of a molding die, and chopped strands and A spray device for injecting a mixture of a curable resin and a curing agent is attached to the tip of the robot arm, the spray device is positioned at the molding position, spray-up molding is performed, and spray-up molding is completed and then spray-up molding is completed. The spray device is moved to the vicinity of the gas ejection device installed at a position that does not interfere during molding, and air is blown from the gas ejection device to the ejection port of the spray device for a certain time, and then the spray device. Fiber-reinforced resin molding characterized by sequentially performing the process of returning the It depends on the manufacturing method of the product.

(Operation) Since the present invention is configured as described above, when the robot arm is actuated and the spray device moves to the vicinity of the gas ejection device at the same time as the completion of the molding of one molded product by the spray-up molding, the spray device The chop adhering to the ejection port is blown off by the air from the gas ejection device, and the cleaning operation is performed by the robot itself.

(Example) Next, an example of a method for producing a fiber-reinforced resin molded product of the present invention will be described with reference to the drawings.

1 to 3 are schematic explanatory views of a spray-up molding apparatus used in the manufacturing method of the present invention. In FIG. 1, 1 is a robot and 2 is a gas ejection device.

An articulated painting robot is used for the robot 1,
A spray device 5 for spraying up is attached to a wrist 4 at the tip of the robot arm 3. The spraying device 5 includes a roving cutter 7 which cuts the guided roving 6 into a predetermined length (about 2 to 50 mm) and ejects it from an ejection port 71, a resin and a curing agent which are pressure-fed through the hoses 10 and 11. And the spray gun 8 which is jetted from the jet port 81 while being mixed with each other, and both jet ports 71 and 81 are close to each other and are opened in the same direction.

The gas ejection device 2 has a concave curved surface 21 as shown in FIG.
.. and a supply pipe 24 communicating with the injection head 23. As shown in FIG. 1, the gas supply hose 12 is connected to the supply pipe 24. To be done.

The installation position of the gas ejection device 2 is a position that does not interfere with the operation of the robot arm 3 during spray-up molding, for example, the central portion of the operation range of the robot arm 3 as shown in FIGS. 1 and 3. It is installed on the ceiling portion 13 which is located diagonally above. Further, the supply of air or the like to the gas ejection device 2 is performed by an hose 12 from an air source such as a compressor (not shown).
Done through. The mold 14 is placed on a turntable 15.

The robot 1 and the turntable 15 are connected to a control operation panel (not shown) via a cable, and the robot arm 3, the spray device 5, and the turntable 15 are controlled by a program taught in advance to perform spray-up molding. Then, a molded product is manufactured. Also,
The program includes a spray device 5 attached to the tip of the robot arm 3 at the end of spray-up molding.
Are taught to move to the gas ejection device 2.

The fiber-reinforced resin molded product is manufactured as follows.

The mold 14 for the bathroom washing room is loaded into the robot work room and placed on the turntable 15. While the spray device 5 is located at the molding position, the spray gun 8 mixes the thermosetting resin and the curing agent and sprays it onto the molding die 14 having a molding area of 4.0 m ² , and the roving cutter 7 moves the roving 6 to 25 A chop is cut into a range of up to 32 mm, and the molding die 14 is sprayed at a blowout rate of 1.3 kg / min to form a laminated layer 16 made of the cut reinforcing fibers and thermosetting resin.

At the time of this molding, the robot arm 3 and the turntable 15 are controlled so that a substantially uniform laminate layer 16 is formed on the entire molding surface of the molding die 14.

The content of the reinforcing fiber in the laminate layer 16 was 28% by weight based on 100% by weight of the laminate, and the time for spray-up molding was 2.5 minutes.

When the spray-up molding is completed, the turntable 15 is rotated to the position where it was carried in, and the molding die 14 is carried out together with the laminate molded product. In parallel with this unloading, the spray device 5 attached to the tip of the robot arm 3 moves to the position of the gas ejection device 2, and the ejection hole 22 of the gas ejection device 2
The air is jetted from the spraying device 5 and blown onto the jetting ports 71 and 81 of the roving cutter 7 and the spray gun 8 as the spraying device 5 for 5 seconds. Spout 71,
The chop 6a attached to 81 is cleaned by being blown off by the air blown from the gas jetting device 2.

When the air injection for 5 seconds ends, the robot arm 3 operates and the spray device 5 returns to the spray-up molding position.

The laminate layer 16 has a relatively short chop of 3 to 4 mm and a resin laminating layer as the first layer, and a relatively long chop of 25 to 32 mm and a resin laminating layer as the second layer as described above. You may form so that it may become a layer.
In this case, the spray-up molding process has two stages,
A dedicated spray-up molding robot 1 and a gas ejection device 2 are provided for each, and molding is performed.

Further, at the time of air injection, the wrist unit 4 of the robot 1 is operated, the spray device 5 is moved left and right, up and down as shown in FIG. If the operation of freely changing the direction of the jet outlets 71, 81 with respect to the jet air flow of is taught, cleaning can be further effectively performed.

By the way, the robot 1 is operated by the conventional method without using the gas ejection device, that is, after the spray-up molding is completed in the same manner as described above.
Operation of the robot is completely stopped, and after confirming that it is safe, the safety door of the enclosure fence is opened to enter the operation range of the robot 1, and air is manually blown to the ejection port of the spray device 5 with an air gun or the like for cleaning. With this method, the cleaning work takes 35 seconds, and the production line must be stopped for that much. Also, since the time required for spray-up molding is as short as 2.5 minutes, other work cannot be done, and one person must be on standby during the spray-up molding.

(Effects of the Invention) Since the method for producing a fiber-reinforced resin molded product of the present invention is configured as described above, even if chops or the like are attached to the ejection port of the spray device to contaminate it, the gas ejection device can still be used. The air blows off the chops adhering to the ejection port of the spray device, and the cleaning operation is performed by the robot itself, so that the ejection conditions from the spray device can always be kept constant. Therefore, the cleaning work by man is eliminated, and the production line can be fully automated and unmanned. Further, since it is not necessary to stop and clean the robot, it is safe and the production time is improved because the time is shortened.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a spray-up molding apparatus used in the method for producing a fiber-reinforced resin molded product of the present invention, and FIG. 2 is the same as above.
A sectional view taken along the line II-II and seen in the direction of the arrow, FIG. 3 is a plan view showing the positional relationship between a spray-up molding robot and a gas ejection device, and FIG. 4 is a conventional example. FIG. 3 is a schematic view of a spray-up molding apparatus for. Explanation of symbols 1 ... Robot, 2 ... Gas ejection device, 22 ... Ejection hole,
3 ... Robot arm, 4 ... Wrist part, 5 ... Spray device, 7 ... Roving cutter, 8 ... Spray gun, 71,81 ... Spout, 14 ... Molding mold, 15 ... Turntable.

Claims (1)

[Claims] 1. A method for producing a fiber-reinforced resin molded article by spray-up molding in which a mixed liquid of chopped strands and a curable resin and a curing agent is sprayed on the surface of a molding die, wherein the chopped strands and the curable resin and the curing agent are mixed. Attach a spray device that sprays liquid to the tip of the robot arm, position the spray device at the molding position, perform spray-up molding, and after the spray-up molding is completed, a position that does not interfere with spray-up molding. A step of moving the spray device to the vicinity of the gas ejection device installed in the device, blowing air from the gas ejection device to the ejection port of the spray device for a certain time, and then returning the spray device to the molding position. A method for manufacturing a fiber-reinforced resin molded product, which is characterized in that it is carried out sequentially by automatic operation.