JPH02279319A - Molding method and molding device - Google Patents

Abstract

PURPOSE:To manufacture easily a container with large volume with a minimum material by using a force of specific structure and carrying out auxiliary stretching of a molding material by means of pressure fluid. CONSTITUTION:A multi-stage type plug 27 mounted on a spindle 25 moving up and down is positioned in an inner space section of a top force 21 and its shape corresponds basically to that of a molded product. A bottom force 29 is mounted on a bottom force base 31 and moves up and down together with said base. When molding is carried out, a molding material 4 is discharged between a lower end surface 33 of the top force 21 and an upper end surface 35 of the bottom force 29, and then the bottom force 29 is lifted up to insert the molding material 4 between both of the end surfaces 33 and 35 and feed molding pressure fluid such as compressed air is fed from an inserting opening 43 into a mold inner space of the top force 21. Thus, a container with large volume can easily be manufactured by using a low strength material or thin wall material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for molding a resin laminate material having an aluminum foil or a metal thin film layer such as aluminum foil and laminated with a resin film on at least one side.

Conventional technology and its problems Traditionally, aluminum foil has been formed using a rigid metal mold consisting of a pair of two molds and a lower mold using a crank press machine, hydraulic press machine, etc. Installed and implemented.

A sectional view of an example of such a known molding die is shown in FIG. In a molding operation using this type of mold,
First, the upper mold (1) descends toward the lower mold (3) and punches out the molded material (5).

Next, the wrinkle presser (11) is pressed upward by the wrinkle presser spring (7) via the push-up bottle (9).
) and the upper mold (1), the upper mold (1) mechanically pushes the lower mold (13) downward, and the upper mold (15) The forming material (5) is drawn into the container to form a deep-drawn container.

However, manufacturing a molded container in this manner requires a complicated and sophisticated mold, which increases the manufacturing cost. In addition, in the case of a composite mold in which a plurality of molded products are manufactured at one time, there are many problems in terms of manufacturing technology, and the work is often difficult.

There is also a method in which molding is performed with the upper and lower molds of the mold shown in FIG. 2 being rearranged seven times. However, in this case, the wall of the container that is being formed is subjected to locally different degrees of processing, resulting in uneven wall thickness and
Therefore, as a molding material, it is necessary to use a material that is thicker than the required amount (2), or a material that has high strength in the required amount (1). , it is economically disadvantageous.

As a result of conducting research in view of the problems of Congolese technology such as L, the present inventor has found that, in addition to using a press and mold with a specific structure, when the auxiliary spreading of the molded material is carried out using pressurized fluid. The inventors have discovered that it is possible to uniformly deform the abrasive material during molding, and that it is possible to easily manufacture containers with a large capacity using a minimum amount of materials.

That is, the present invention provides the following apparatus and -)5 method: ■ In an apparatus that performs molding while holding a molding material between a 1-mold and a clove mold, the 1-mold Inside the inner space (Press 1 whose external shape gradually decreases in the °F direction (37 is movably arranged downward and molded to 1) 4 materials 1-6 surfaces 1. A molding device comprising: a pressurized fluid supply mechanism for pressing the molding device.

■When forming and pressurizing the material between the upper mold and the lower mold, the material is molded using a pressing mold that gradually decreases its external shape downwards in the space inside the upper mold. 1'l
A molding method characterized in that, at the same time as pressing, a pressurized fluid is supplied to the F side of the molding material to spread the molding material in the portion that contacts the stamping mold step part.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

In the molding die according to the present invention, whose basic structure is shown in perspective in FIG. (It is fixed to the rebase (23) and does not move during the molding operation. It"0 (2)) has -
1. A multistage plug (27) attached to a downwardly moving spindle (25) is located, the shape of which basically corresponds to the shape of the molded product.

The lower mold (29) is placed on the lower mold base (31) and moved downward with it. This movement starts when the molding operation starts, and the bottom end face (33) of the lx JK' mold (21) and the one end face (35) of the ]-' mold (29)
1. In the inner space of the lower mold (29), if necessary, there is a presser plate (37) and a presser plate (37) for adjusting the presser pressure. A pressurizing device such as a spring (39) can be arranged.

When molding, the molding material 4 (41) is -1
- placed between the lower end surface (33) of the mold (21) and the end surface (35) of the lower mold (29);
Raise the molding process (coloring material (4)) to both end surfaces (33),
(35), and pressurized fluid for molding such as compressed air is supplied from the insertion port (43) to the internal space of the old type (21).

In order to prevent leakage of pressurized fluid for molding, an O-ring (
45) should be installed appropriately.

Figures 3(a) to 3(f) show the operating conditions of each part and the usage status of the molding fluid when performing molding operations using molding metals 1 to 1 shown in Figure 1. .

At the stage of Fig. 3(a), -[) (21) and F),
A molding material (41) is placed between (,)5 and (29).

At the stage shown in FIG. 3(b), the lower mold (21) rises and strongly pinches the molding material (41) between it and the upper mold (29).

At the stage of FIG. 3(C), pressurized fluid for molding such as compressed air begins to be supplied from the insertion port (43) to the mold internal space of the upper mold (21), and as shown in FIG. 3(d), phase, the spindle (25) begins to descend, so that
The multistage plug (27) descends using air as a lubricant,
Perform molding. During this time, the supply of pressurized fluid for molding is continued until the multistage plug (27) reaches the bottom dead center.

When the multi-stage plug (27) reaches the bottom dead center, as shown in Fig. 3 (
As shown in e), at the same time that the molding pressure fluid is discharged from the insertion port (43) to the outside of the apparatus, the spindle (25) rises and the multi-stage plug (27) returns upward again.

After confirming that the molding pressure fluid has been discharged, the lower mold (29) is lowered and the molded product (
41°) out of the device.

After that, a new molding material (41) is placed between the upper mold (21) and the lower mold (29), and the next molding process is started.

In the above process, the pushing pressure of the lower mold (29) against the upper mold (21) needs to be greater than the pressure of the supplied molding pressure fluid.

In addition, in order to firmly hold the molding material between the upper mold (21) and the lower mold (29) and more reliably prevent the molding material (41) from being drawn into the mold, Upper mold (21)
It is preferable to reduce the contact area between at least one end surface of the lower die (29) and the lower die (29). An example of this is as shown in FIG.
7).

With this configuration, parts other than the molding part are held in a flat state, making it possible to arrange multiple molds on the same plane, and making multiple containers with a single operation. Manufactured.

The multistage plug (27) used in the present invention reduces the contact pressure with the molded material f4 by using a molding pressurized fluid (for example, compressed air) as a lubricant during molding, and also reduces the elongation of the material at each stage. That is, by making the amount of deformation uniform, it is possible to realize the ultimate formability of manufacturing a container with the maximum internal capacity from the minimum amount of molded material.

Press-1-gear W (37) in the lower mold (29) shown in Fig.
) can also be utilized to define the shape of the bottom of a molded container. The push-up plate (37) pushes I/ into contact with the multi-stage plug (27) with the molded material (41) in between, slightly before the multi-stage plug (27) reaches its bottom dead center. It is most advantageous to do so.

In addition, when stamping such as marking on the bottom of a molded container, by providing a shape corresponding to the surface shape of the lowest stage of the multistage plug (27) on the surface of the push-up plate (37), the molding can be performed. Operation and marking operation can be performed simultaneously.

FIG. 4(a) shows the installation of the multistage plug (27) to the spindle (25). Multistage plug (27)
A through hole (49) passing through the top and bottom, and communication holes (51), (5
3) and (55) are provided. It is preferable that these communicating holes are provided radially.

During the molding process, the molding material (41) gradually deforms while contacting the multistage plug (27), as shown in FIG. 4(b). At this time, the molded material (41) usually comes into strong contact with the corners of the multistage plug (27) and is locally subjected to strong pressure, resulting in uneven deformation. In the device of the present invention, from the through hole (49) to the through hole (51), (53
) and (55), the molding material (41) is pushed outward at locations other than the contact area, so that the molding material (41) and The contact pressure with the corner of the multistage plug (27) is reduced, and the forming process/N4 (41) is uniformly spread over the entire surface. As a result, the molding material surrounded by the end face (33) of the mold (21) and the end face (35) of the dowel (29) is subjected to a uniform molding force as a whole.

Figure 5 shows F-type (29), multi-stage plug (27), pressurized fluid and molded material FJ during molding operation according to the present invention.
The behavior of (41) is summarized and shown as a flow diagram.

FIG. 0 shows an example of a pressure fluid control circuit in the book. The pressure fluid from the pressure fluid source (P) passes through the pressure crab t (P + ) and is then sent to the pressure regulator (R,
), the lower mold (29) sent from the sensor swig (S) moves from the valve (V+) through the pressure gauge (P2) in accordance with the movement <A'-":I.
．． It is fed into a mold (21). When the molding is finished and the lower mold (29) is sent again from the sensor switch (S), the valve (Vl) is closed and
When the valve (V2) is opened, the pressurized fluid in L+-va (21) is discharged to the device train at 4ff+1°, which is the pressure fluid used for molding. Is Izui 1 of the gas? :' may also be used, and may be selected as appropriate depending on the type of molding material, the method and shape of the molded product, etc. For example, when molding a food container 1 using a ladle 1 with a simple configuration, it is preferable to use compressed air.
! 4. ,! -, t-, especially limited to 4゛, aluminum foil, r5-=-uno, synthetic resin film l on at least one side of the foil, lamination with rJil'' layer),, +A
6. If the material of the r-stage plate is only metal, j′, pressure l
lisuj that has cutting properties against ζ bodies: Kasumibu; Nosu'
Tsuku (in one row, po 11 amyl 1, poly ding stell, polyzo 1'J pyrene, polyethylene, j, poxy tree i 15
．． '7 acrylic resin, etc.) 3. Nidota,
L, 1. ? The material of the 1st, 11th, and other parts is not limited to metal, but is also made of hardwood plus y...! You can use the following.

Effects of the Invention According to the present invention, the following remarkable effects are achieved.

(b) Molding process 1. To ensure that the material changes uniformly, use a low-strength material C+ or a thin material.
t11 people 4゛・;Im)) It is possible to manufacture 4 using K. 3゜(e) A good product with no defects due to squeezing during molding can be produced.

(d) Sequential molding of multiple containers in series 1'
, can be done.

[Brief explanation of drawings]

Figure 1 shows the basic manufacturing of the molding die according to the present invention in 1 Jyh.
There is a cross-sectional view C'. FIG. 2 is a cross-sectional view showing an example of a known molding die. FIGS.
t; QH (, perform molding #'Ja production using y7-)
The movement status of the three parts of the convex part, 1, and the usage status of the upper blade fluid for molding are on the small side and the side C. Figure 1 (3) and (1))
5) is a sentence, 1 Zuruku Danshiki Shira 7” (27) no Tori (=]
status and f'l movement status of the multistage plug (27).
Figure 5 shows the present invention (, 5 during operation) Vsu (29), multi-stage plug (27), r + upper blade fluid and forming 111 + i ': r + Jti (Total behavior of 4D r, v; L 41, 1 noro・DaI'A・gu;
It is num. . 17) Figure 1 shows 19 lines of light 1:, Luke θ41□
Figure 1 - An example of one circuit for body n: 1 circuit, (1)... 1. :, ,! ,X(-,3)・
・Lower mold (5)...Molding + JII -r", H#, ■...Wrinkle presser spring...Push up pin...Wrinkle presser...Lower mold..." 2 molds... L-type...Upper die base...Spindle...Multi-stage plug...Lower die...Lower die base...End face of upper die (21)...End face of lower die (29)・・・Pushing plate ・Spring ・Molding material ・Insertion port for pressurized fluid ・O ring (47) ・Protruding part (49) ・Through hole (51 ), (53), communication hole...connects to the through hole (or more)

Claims (2)

[Claims] (1) In a device that performs molding while holding a molding material between an upper die and a lower die, a press die is moved vertically into a space within the upper die so that the external shape gradually decreases downward. What is claimed is: 1. A molding apparatus characterized in that the upper die is provided with a pressure fluid supply mechanism for pressing the upper surface of the molding material. (2) When molding material is held between the upper mold and the lower mold and molded, the molding material is pressed into a mold provided in the space inside the upper mold and whose outer diameter gradually decreases downward. A molding method characterized in that the molding material is spread in a portion contacting a pressing mold stage by supplying a pressure fluid above the molding material.