JPH04129711A - Device for forming plastic composite material under pressure and heat - Google Patents

Abstract

PURPOSE:To permit a uniform and rapid heating avoiding the need for temperature control by making up the device structure of plate heaters, resistance heating bodies and electrode plates for energizing material. CONSTITUTION:An electrically conductive laminated prepreg material is held between plate heaters 2 and these plate heaters are interposed between heat insulating plates 4, which are pressed between a slide 5a and a head 5b of a pressboard 5. Each of the plate heaters 2 in such a pair contains therein a resistance heating body 10 enclosed with an insulating material and the plate heaters so formed as to cover the resistance heating body 10 functions as an electrode plate 11. The resistance heating body 10 is connected with an AC electric source 12 and a pair of the electrode plates 11 is connected with a DC electric source 13 or the AC electric source. Therefore, both sides of the prepreg material 1 is heated between the plate heaters 2 and the heat thus produced is transmitted from the material surface by the resistance heating bodies 10 and, at the same time, the material is energized by the electrode plates 11 to be heated from its interior.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pressure and heat molding apparatus for plastic composite materials.

[Conventional technology and its issues]

In general, composite materials have various properties that cannot be obtained with a single material, and are therefore widely used in aerospace structures, for example. By the way, plastic composite materials include reinforced plastic (GFRP) made of glass fiber and resin, and carbon fiber composite material (CF) made of carbon fiber and resin.
RP), but methods such as hand lay-up method, filament winding method, lamination method using hot press or autoclave are selected as appropriate for molding these composite materials depending on the part application and type of resin. .

For example, to mold carbon fiber composite materials, sheet materials called prepreg materials, which are carbon fibers impregnated with thermosetting resin, are laminated, heated at 130 to 200°C, and then molded in a mold while applying pressure. The method used is to harden the resin and mold it.

In order to form the material made of such prepreg material by pressing, as shown in FIG. 5, electrode plates 2' made of copper foil,
A molding method has been proposed in which a press plate 5 is brought into contact with the press plate 2' through an end plate, a release paper 3, and a heat insulating plate 4, and heat is applied under pressure. Note that 6 is a temperature sensor, 7 is a temperature controller, and 8 is a power source.

However, in the pressure and heat molding method using such a press,
Since the upper and lower surfaces of the prepreg material 1 are sandwiched between the electrode plates 2' and energized to generate heat, a temperature difference occurs between the surface and the center of the prepreg material 1. Therefore, it is necessary to heat the prepreg material 1 over a long period of time and press it.
In particular, there is a problem in that as the thickness of the prepreg material 1 increases, more time is required.

(Means for solving RIl!) Therefore, the present invention was created to solve this problem, and its gist is to use a conductive material made of reinforcing material and plastic material as a power source. In a molding device that pressurizes and heats the material by sandwiching it between a pair of connected heating plate heaters, the heating plate heater is insulated from the resistance heating element provided inside the heating plate heater, and the material is A press and heat molding apparatus for a plastic composite material is provided, characterized in that a plate body is formed by integrating an electrode plate for energizing.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure and operation of the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.

Figure 1 is a conceptual diagram of the first embodiment using a hot press, Figure 2 is a conceptual diagram of the second embodiment, and Figure 3 is a conceptual diagram of the third embodiment using an autoclave. is a conceptual diagram of the fourth embodiment. Note that the same parts as in FIG. 5 showing the conventional example are given the same reference numerals.

Each embodiment of the present invention is suitable for a method of molding a composite material in which Matri-Nox made of a thermosetting resin or a thermoplastic resin is reinforced with electrically conductive glass fiber or carbon fiber. The wood is suitable for making aircraft and space-related bodies and parts.

In the first embodiment, as shown in FIG. 1, a heating plate heater 2°2 is brought into contact with the upper and lower surfaces of the laminated conductive prepreg material,
The top thereof is sandwiched and pressed by a press plate 5 consisting of a slide 5a and a spatula 5b via a heat insulating plate 4.

Here, each of the pair of heating plate heaters 2 has a built-in resistance heating element (for example, nichrome wire) 10 surrounded by an insulating material (not shown), and this resistance heating element l
The heater body itself, which is formed so as to surround O, serves as an electrode plate 11. The resistance heating element 10 is connected to an AC power source 12, and the electrode plates 11 are connected in pairs to a DC power source 13 or an AC power source.

Therefore, the upper and lower surfaces of the prepreg material l are connected to the heating plate heater 2.
. As a result, the heating of the prepreg material 1 becomes uniform in the thickness direction, and moreover, the pressurizing and heating operation can be performed quickly.

Next, as shown in FIG. 2, the second embodiment differs from the first embodiment in that a plurality of prepreg materials 1 are stacked in multiple stages, an electrode plate 11 is interposed between each prepreg material 1, and a heater Since the main body is not an electrode plate, an insulating material 14 is also interposed between the resistance heating element 10 and the prepreg material 1.

Next, in the third embodiment, an autoclave (not shown) is used.
This is applied to a pressurized and heated molding method using a container whose internal temperature and pressure can be precisely controlled. That is, in FIG. 3, the heating plate heater 2,
The prepreg material 1 sandwiched between the two is placed, and the top thereof is covered with a bagging film 16. Note that 17 indicates a sealing material attached to the lower end of the outer periphery of the bagging film 16.

Next, in the fourth embodiment, as shown in FIG. 4, unlike the third embodiment, a plurality of prepreg materials 1 are stacked in multiple stages.

The resistance heating element 10 in each of the embodiments described above may be a far-infrared heater plate built into a case made of ceramic or the like, and the power source may be either alternating current or direct current.

Further, the present invention is not limited to a method for molding plastic matrix materials, but can also be applied to a method for molding metals such as aluminum as a matrix.

〔Effect of the invention〕

According to the present invention, the heat generating plate heater of the pressurized heat forming apparatus by one action is composed of a resistance heating element and an electrode plate that conducts current to the material, so that heating of the material is uniform in the thickness direction and the plane direction. In particular, even thick materials can be heated quickly. Therefore, there is no need for temperature control in particular, and although this type of molding method has to be a batch method, the waiting time for the operation can be shortened. Moreover, since it is a plate body, it can be easily installed in an existing autoclave or press.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram of the first embodiment of the present invention using a real breath, Fig. 2 is a conceptual diagram of the second embodiment, Fig. 3 is a conceptual diagram of the third embodiment of the invention using an autoclave, and Fig. 4 is a conceptual diagram of the fourth embodiment, and FIG. 5 is a conceptual diagram of the conventional example. DESCRIPTION OF SYMBOLS 1... Prepreg material, 2... Heat generating plate heater, 10... Resistance heating element, 1... Electrode plate. Sub-Agent Patent Attorney Yoshihiko Okabe

Claims (1)

[Claims] (1) In a molding device that presses and heats a conductive material made of a reinforcing material and a plastic material by sandwiching it between a pair of heat-generating plate heaters connected to a power source, the heat-generating plate heater is provided with a resistor inside thereof. a heating element;
An apparatus for pressurizing and heating a plastic composite material, characterized in that a plate body is formed by integrating an electrode plate which is insulated from the resistance heating element and which energizes the material.