JPS6354232A - Molding equipment - Google Patents

Abstract

PURPOSE:To make it possible to easily obtain even a large sized deep-drawn container and to realize the formings by simultaneously using a large number of molds different in dimensions and shape by a method wherein pressure fluid and a molding equipment which uses a mold having through holes are used. CONSTITUTION:The main constitutional elements of a molding equipment are a mold 1, a keep plate 3 and a movable control plate 5. In order to more effectively prevent pressurizing fluid for forming from leaking, a projected part 7 is provided at a position corresponding to the opening peripheral edge of a formed container. In the keep plate 3, a feed port 13 of pressurizing fluid for forming, which is fed from an influx port 9 through a flow path 11, is provided. A through hole 15, the cross-sectional shape of which corresponds to the opening part of a formed item and which is provided in the mold 1, and the movable control plate 5, which can vertically move in said through hole 15, are combined with each other. In the comparatively earlier stage of forming, the most swollen out central part of stock contacts with the movable control plate 5, which is arranged at the upper part of the through hole 15 of the mold 1 and fixed temporarily. Next, the contact area between said part of stock and the plate 5 gradually increases.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for molding a plastic composite material containing metal foil.

Known methods for forming containers from laminates or composite materials made of metal foil and plastic films or sheets include a cold drawing method and an air forming method.

However, it is not suitable for high-mix, low-volume production. Furthermore, in order to prevent breakage and rough skin during molding, the thickness, yield strength, and elongation of the metal foil in the composite material are significantly limited.

On the other hand, in the air forming method, the composite material is made to conform to the female mold using air pressure, and the elongation at the bottom is greater than that at the side walls. It is easy to tear and is generally not suitable for deep drawing.

As a result of intensive research in view of the conventional assembling points as described above, the inventor of the present invention has found that the method uses a mold having through holes, although it is somewhat similar to the air forming method in that it uses a pressurized fluid. It has been found that these problems can be substantially overcome if a new molding device that is essentially different in some respects is used. That is, the present invention provides the following apparatus: An apparatus for molding a plastic composite material containing metal foil, comprising:
A mold that has a through hole with a cross-sectional shape that corresponds to the opening of the molded product, a presser plate that holds the plastic composite material in a predetermined position, a mechanism that supplies pressurized fluid for plastic composite molding, and a A molding device characterized by comprising a movable control plate that controls the bottom shape of a molded product by contacting the bulging portion.

The present invention will be described in more detail below with reference to embodiments shown in the drawings.

The molding apparatus of the present invention shown in FIG. 1 includes a mold (1), a presser plate (3
) and the movable control board (5) as the main I2i! The element is Sakaki Sei.

The presser plate (3) may be made of any material, but it holds the plastic composite material containing metal foil well between the mold (1) and prevents leakage of pressurized molding fluid. In order to prevent this as much as possible, it may be preferable to use a resilient plastic material such as nylon. In order to more effectively prevent leakage of the pressurized fluid for molding, it is desirable to provide a tlltK convex portion (7) corresponding to the periphery of the opening of the molding container. The holding plate (3) is provided with a supply port Q3 for pressurized fluid for molding, which is supplied from the inlet (9) through the flow path αη during the molding operation. In the present invention, the combination of a through hole αG provided in the mold (1) and having a cross-sectional shape corresponding to the opening of the molded product and a movable control plate (5) that can move vertically within the through hole aυ is , is extremely important.

Molding material Q7) when movable control plate (5) is not used
The behavior is shown in Figure 2. Due to the pressurized fluid supplied from the supply port α4, the vicinity of the center of the material αη undergoes the largest plastic deformation and takes on a circular or parabolic cross-sectional shape. In this case, the amount of plastic deformation is small in the vicinity of the peripheral edge of the material σ, which is strongly held between the presser plate (3) and the convex portion (7) of the mold (1), and therefore, the amount of plastic deformation is small; The upper part of the through hole 〇〇 (
11! 1. The depression forming of bends close to the wall is not performed. In the case of a limited number of materials with excellent extensibility and high strength, it is possible to perform depression molding by further molding, but in the case of ordinary materials, further molding is only possible at the center. This may cause damage near the part.
Have difficulty. Even if a shallow container can be formed from the above-mentioned limited materials without damaging the materials using the apparatus mK shown in FIG. 2, it is difficult to uniformly process the containers. In particular, in a molded product having a straight portion in one opening as shown in Fig. 3, the degree of W-induced deformation is significantly different between the cross section along the A-AI line and the cross section along the B-Bl line. . FIG. 4 schematically shows a cross-sectional shape along the A-AI line and a cross-sectional shape along the B-Bl gland. In particular, it is clear that the machining in the vicinity of corner C is insufficient.

On the other hand, when molding a material Q made of a plastic composite material containing metal foil using the apparatus of the present invention, as shown in FIG. The central most bulging part is arranged above the through hole Qυ of the mold (1) and comes into contact with the temporarily fixed movable control plate (5), and then its contact area increases. At this time, the amount of plastic deformation of the material in the portion that is in contact with the movable control plate (5) is greatly reduced, so no damage to the material 0η occurs. Therefore, it is possible to increase the pressure of the pressurized fluid from the supply port α4, and as a result, the part corresponding to the part shown as rm in FIG. Become. After that, by lowering the movable control plate (5) sequentially while adjusting the pressure of the pressurized fluid so as not to damage the material Oη, the part of the bulging part of the material that has not been stretched out is plastically deformed. Then, a deep-bottomed container can be formed (see Figure 6).

The position of the movable control plate (5) at the start of molding and the descending speed of the movable control plate (5) are set so that the thickness of the center bottom of the container and the wall thickness of the side wall portion at the end of molding are as equal as possible. It is sufficient to set it as . However, if the container depth is shallow, the movable control plate (5) should be placed at the position corresponding to the depth from the beginning, and the material will remain the same! It may also be directly molded.

The material to be molded by the apparatus of the present invention is a plastic composite material containing metal foil, but is not particularly limited. One example is an aluminum foil of about 20 to 100 μm and an inner layer of 100 to 300 μm. degree of volip Oe
2 to 100 μ as run or polyvinyl chloride and outer layer material
Examples include a composite material laminated with a resin-coated film made of evo-cow yarn with a diameter of about 1.5 m, a biaxially oriented polypropylene film, or a biaxially oriented nylon film.

In addition, pressurized fluids used during molding include water, oil,
It may be air or the like, and is selected depending on the type of molding material, the shape of the molded product, etc. - If a simple food container is to be formed, air pressure is used, and if high pressure is required, an MIt field or paddy field is used.

The mold used in the present invention is very simple and inexpensive, so
Suitable for high-mix, low-volume production using multiple devices. In addition, since the molding material is uniformly plastically worked, large-sized deep-drawn containers can be easily obtained. During molding,
Since no lubricant is required between the molding material and the mold, it is suitable for molding containers for food and medicine. Furthermore, since the molding device does not require an upper mold, there is no need for time for mold fitting adjustment during molding, simplifying the work and improving workability. As for the molds used, it is possible to perform molding by simultaneously using a large number of molds having different sizes and shapes.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an outline of an example of the molding apparatus of the present invention;
FIG. 2 is a sectional view showing the molding situation when the movable control plate is omitted from the device of the present invention, FIGS. 8 and 4 are drawings showing the plastic deformation state of the molded product by the device in FIG. 6 and 6 are cross-sectional views showing the molding situation by the molding apparatus of the present invention. (1) Mold, (3) Holding plate, (5) Movable control plate, ■ Pressurized fluid supply port, aη Molding material. (that's all)

Claims (1)

[Claims] (1) A molding device for plastic composite material containing metal foil, which includes a mold having a through hole with a cross-sectional shape corresponding to the opening of the molded product, a presser plate that holds the plastic composite material in a predetermined position, and plastic composite material molding. 1. A molding device comprising: a mechanism for supplying pressurized fluid; and a movable control plate that contacts the bulge of the molded product during molding to control the shape of the bottom of the molded product.