JP2943261B2 - Method of forming rod-shaped part by FRP - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for forming a relatively long pipe-like part such as a beam used in a work transfer device of a transfer press. The present invention relates to a forming method for forming a rod-shaped part by FRP.

2. Description of the Related Art As shown in FIGS. 4 and 5, as a work transfer device of a transfer press, a pair of dies (not shown) arranged in a line direction and a pair of dies extending in a line direction on both sides are arranged. Elevating frames a and b are provided, and the elevating frames a and b
A plurality of movable bases (not shown) movable in the line direction are provided, and the movable bases are connected to each other while maintaining an interval corresponding to the interval between the dies so that they can reciprocate in the line direction. The movable tables are provided with a pair of support tables e and f that can approach and separate from each other in the line direction, and the beams c and d are connected between the support tables e and f facing each other with the line interposed therebetween. There is a configuration in which a vacuum cup g capable of adsorbing and releasing the work h is attached to c and d (actual opening 62
-118640).

In this transfer press, for example, when the work h is pressed at the upstream mold setting position A, the lifting frames a and b are raised, and the beams c and d are retracted in the state close to the intermediate position C. Position A while separating
To lower the elevating frames a, b to lower the beams c, d
Is lowered onto the work h at the position A, and the vacuum cup g is operated to adsorb the work h to the beams c and d. Thereafter, the elevating frames a and b are raised and the beams c and d are raised.
And moving the movable table to move the beams c and d to convey the workpiece h to the downstream die installation position B, where the lifting frames a and b and the beams c and d are moved. The workpiece h is lowered and the suction of the vacuum cup g is released to lower the workpiece h to the position B. After lowering the work h, the elevating frames a, b are raised to retreat the beams c, d from the press position to the retreat position, and at the same time, the beams c, d are moved again to the intermediate position C while approaching,
The work h is pressed at the position B while the lifting frames a and b are lowered to retract the beams c and d. In this way, all the works h are pressed while being sent downstream by the periodic operation of the lifting frames a and b and the beams c and d.

The beams c and d used in the work transfer device of the transfer press are usually manufactured in the shape of a square pipe using a steel mold as shown in FIG.

However, since the beams c and d have a length of 2 to 4 m and are manufactured from the shape steel as described above, the weight is large, and when the operation of the beams c and d is accelerated, Since the vibration may increase, the vacuum cup g may not be able to adsorb the work h, or the adsorbed work h may be dropped during transportation. There is a problem that can not be.

In order to solve such a problem, in recent years, as a method for reducing the weight and increasing the strength of the beam, as shown in FIG. 7, a structure in which a core material obtained by foaming and solidifying a urethane resin is coated with a glass fiber reinforced resin 13 is adopted. A beam 11 in which a vacuum cup 14 is fixed has been proposed.
-165132).

[Problems to be Solved by the Invention] However, the beam for a work transfer device described in Japanese Utility Model Laid-Open Publication No. 1-165132 may reduce the weight and generate vibration even if the work transfer speed is increased. Although there are many advantages, such as a small number, the molding is difficult.

Accordingly, the present invention is to provide a molding method capable of easily manufacturing a rod-shaped component by FRP (fiber reinforced composite material) such as a beam described in Japanese Utility Model Laid-Open No. 1-165132. is there.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention embeds an embedding fitting in a surface portion of a rod-shaped soft core material that generates an internal pressure with respect to an external compressive force, Further, an FRP material is laminated on the outside of the soft core material, and the soft core material is coated with the laminate, and then the soft core and the laminate are integrally placed in a mold, and the outside is formed by the mold. In the state where internal pressure is generated in the soft core material inside, the mold is heated together with the mold, and the laminate is molded and hardened by pressure from inside and outside, and the laminate, the soft core material, and the embedding metal fitting are integrated. And a molding method for molding a rod-shaped part.

[Action] When the female mold is tightened, the pressure generated by the compression of the soft core material as the core material becomes the internal pressure,
There is no need to provide a pressure generator for pressurizing the inside, and the laminate of FRP material is pressed against the inner surface of the mold by the internal pressure generated by the compression of the soft core material inside between the soft core material and the mold Will be. As a result, a molded article having a good external shape is obtained.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

For example, an embedding fitting 2 is embedded along the longitudinal direction on the surface of a soft core material 1 formed by shaping styrofoam into a long prismatic shape, and an FRP material 3a such as a prepreg is wrapped around the soft core material 1. And the soft core material 1 is covered with the laminate 3 as shown in FIG.

Next, as shown in FIG. 2, two female molds 4a and 4b having an L-shaped cross section and an inner surface corresponding to the outer shape of a molded product to be molded are prepared. The laminate 3 shown in FIG. 1 is placed inside the molds 4a and 4b in a state of being integrated with the soft core material 1, and the molds 4a and 4b are tightened. Mold 4 above
The tightening force Pa by a and 4b is the second position of the center position of each mold 4a and 4b.
It can be generated by pressing in the direction of the arrow in the figure,
For example, assuming that the external dimensions of the laminate 3 are 95 mm square, the tightening amount is set so that the finished angle as a molded product is 90 mm square.

In addition, as a method of forming a pipe-shaped part,
127136, JP-A-60-139433, JP-A-60-139434,
Japanese Unexamined Patent Publication Nos. 61-213137 and 1-78825 disclose patents, all of which are internal pressurized expansion systems and require a pressurizing device. .

In the method for forming a rod-shaped part according to the present invention, the integrated product of the laminate 3 and the soft core material 1 is molded into molds 4a and 4b as shown in FIG.
When the inner core is tightened from the outside with a required tightening force Pa by the molds 4a and 4b, the internal soft core material 1 is compressed to generate a force to be restored as an internal pressure P. As a result, the laminate 3 is pressed against the inner surfaces of the molds 4a and 4b. Therefore, the laminate 3 is clamped by the internal pressure of the soft core material 1 from the inside and the pressure from the inside and outside by the clamping by the molds 4a and 4b from the outside. This eliminates the need to separately provide a pressure generator for pressurizing the inside.

Next, in this state, the whole is heated together with the dies 4a and 4b to melt the laminate 3. Thus, the laminate 3 becomes the mold 4
Since it is formed into an outer shape along the inner surfaces of a and 4b and cured as it is, a good molded product is formed.

FIG. 3 shows a molded product 5 formed by the above-described method. The molded product 5 can be a lightweight and rigid rod-shaped component, and can be connected using the embedded metal fitting 2.

In the above-described molding method, the case where a rod-shaped part having a square cross section is molded as the molded product 5 has been described.
It is of course possible to form a circular cross section by changing the cross-sectional shape of the mold and the shapes of the molds 4a and 4b.

[Effects of the Invention] As described above, according to the method of forming a rod-shaped component of the present invention, the rod-shaped component is embedded in the surface of a rod-shaped soft core material that generates an internal pressure with respect to an external compressive force. On the outside of the soft core material, an FRP material is laminated, the soft core material is covered with a laminate, and then the soft core and the laminate are put into a mold as a unit, and tightened from the outside by the mold. In the state where the internal pressure is generated in the internal soft core material, the entire die is heated, and the laminate is molded and hardened by pressure from inside and outside, and the laminate, the soft core material, and the embedding metal fitting are integrated. Since the rod-shaped part is formed by pressing, the laminate is pressed against the inner surface of the mold, and the pressure generated by the compression of the soft core material by the clamping of the mold is performed as an internal pressure. Separate pressure generator In addition, long rod-shaped parts such as beams for work transfer devices of transfer press can be easily formed as high-precision ones with excellent external dimensions. In general, the FRP has a laminated structure, so that the strength between the layers is low, so that even if the tap is directly cut and screwed, the bonding strength is extremely low. , Because FRP is weak to concentrated load, even if it has a structure to transmit the load by shear bolts with drilled holes,
Bearing failure at the periphery of the above borehole (contact compression failure)
Another large backing plate (backup plate) when connecting other parts with bolts due to
In this case, a rod-shaped part formed by the molding method of the present invention is a separate member. Is connected by bolts, it is possible to obtain an excellent effect that other members can be easily connected by bolts or the like by providing screw holes or conical holes in the integrally formed mounting bracket.

[Brief description of the drawings]

1 and 2 are sectional views showing an embodiment of a molding step of the molding method of the present invention. FIG. 3 is a perspective view showing an example of a molded article molded by the molding method of the present invention. FIG. 5 is a schematic view showing the mechanism and operation of a work transfer device of a conventional transfer press, FIG. 6 is an enlarged view of a beam used in the above-described conventional work transfer device, and FIG. 7 has been proposed in recent years. It is a perspective view of a beam. 1 ... Soft core material, 2 ... Embedded fitting, 3 ... Laminate, 3a
... FRP material, 4a, 4b ... mold, 5 ... molded product, P ... internal pressure, Pa ... tightening force.

Claims (1)

(57) [Claims] 1. An embedding fitting is embedded in the surface of a rod-shaped soft core material that generates an internal pressure with respect to an external compressive force, and an FRP material is further laminated outside the soft core material. Then, the soft core material was covered with the laminate, and then the soft core material and the laminate were integrally placed in a mold, and the mold was tightened from the outside to generate an internal pressure in the inner soft core material. In this state, the mold is heated together with the mold, and the laminate is molded and hardened by pressure from inside and outside, thereby forming a rod-shaped part obtained by integrating the laminate, the soft core material, and the embedding metal fitting. A method of forming rod-shaped parts by FRP.