JP2003126919A - Squeeze-processing method for resin-laminated aluminum foil, squeeze-processed products and squeeze-processing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a squeeze-processing method for resin-laminated aluminum foil which improves a threshold limit for a formed protrusion height while maintaining a high quality. SOLUTION: This relates to a squeeze-processing method to conduct a forming on a workpiece 1 by using a punch 20 which is made of a resin- laminated aluminum foil with at least one side being laminated with resin film, and is clamped by a die 10 and a presser panel 30. The surface roughness (Ra) of a workpiece installation surface 12 is required to be 0.08 to 1.0 μm.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a drawing method for drawing a base plate made of a resin-laminated aluminum foil having a resin film laminated on at least one surface thereof,
The present invention relates to a drawn product and a drawn device.

[0002]

2. Description of the Related Art When a resin-laminated aluminum foil laminated with a resin film is used as a base plate and a product such as a container with a bottom is manufactured by drawing, a processed product is prevented from wrinkling on a die. There is a well-known drawing method in which a blank plate installed in a plate is pressed against a die side by a wrinkle retainer plate to form the blank plate by a punch while being sandwiched between the die and the wrinkle retainer plate.

Conventionally, in such drawing,
Various methods have been proposed for improving the limit forming height (depth).

For example, a lubricant is mixed in a resin layer laminated on a resin-laminated aluminum foil as a base plate to reduce the coefficient of friction between the base plate and the mold, thereby improving the limit forming height. Method, mirror surface processing to reduce the surface roughness to reduce the friction coefficient between the blank plate and the mold, thereby improving the limit forming height, the blank plate and the mold It is well known that a lubricant supplied between and reduces the friction coefficient between the two and thereby increases the limit forming height.

Further, the pressing force of the wrinkle pressing plate during drawing is controlled so that the forming force by the punch is adjusted to be equal to or less than the breaking load of the blank plate (Japanese Patent Laid-Open No. 63-1047).
No. 29), or a method in which a plurality of punches are used to perform drawing processing by multistage molding (Japanese Patent Laid-Open No. 1-244226).
Japanese Unexamined Patent Publication No. 56-14) or a method in which a blank plate is pressed against the inner peripheral surface of a female mold by compressed air to perform molding (JP-A-56-14).
No. 4837) has been put to practical use.

[0006]

However, in the method of mixing the lubricant with the resin layer of the base plate, the amount of the lubricant mixed is
There is a problem in that it is difficult to manufacture the base plate and the material cost is increased.

Further, in the method of mirror-finishing the die surface,
A complicated process such as grinding and polishing is required.
There is a problem that it becomes difficult to manufacture the mold and the cost increases.

Further, the method using a lubricant has a problem that the efficiency of production is lowered and the cost is increased because a step of removing the lubricant after molding is required separately.

Further, the method of controlling the pressing force of the wrinkle pressing plate and the method of multi-stage molding with a plurality of punches require a special structure such as a pressing force adjusting mechanism and a plurality of punches, which complicates the structure. There is a problem that not only comes, but also the cost increases.

As described above, in the above-mentioned conventional technique, it is difficult to manufacture a blank plate or a mold or to draw, or there is a problem that the apparatus structure is complicated or the cost is increased. However, it has been difficult to sufficiently improve the limit forming height of drawn products.

[0011]

Under the above circumstances, the present inventor has aimed to improve the limit forming height, and
First, detailed analysis was performed on the conventional drawing method.
According to it, in all of the conventional drawing methods, the part that is most likely to break during cold working (hereinafter referred to as "breaking risk part"), specifically, punch punch in the forming part of the blank plate. It is to provide a technique for preventing the wall thickness of the surface shoulder portion from becoming thin, and by smoothly flowing the constituent materials around the punch top surface shoulder portion of the molding portion as the break risk portion, It was intended to provide a technique for preventing uneven thickness and improving the limit forming height.

As a result of an experimental study based on these analysis items, it is possible to prevent the reduction of the wall thickness of the breakable portion itself, even if the material flows as smoothly as possible only around the breakable portion. It has been found that it is difficult to improve the critical forming height unless the reduction in wall thickness is suppressed.

Therefore, the present inventor has made it possible to cause the material to flow from the portion other than the fracture risk portion to the molding portion at the time of drawing,
The technique of improving the limit forming height was examined, and for example, the technique of flowing the material from the flange portion around the forming portion of the raw plate to the forming portion was examined.

However, when the flange portion of the blank is strongly sandwiched by the die and the crease presser plate during molding, almost no material flow from the flange portion to the molding portion is observed, and it is difficult to improve the limit molding height. Met. Furthermore, when the holding force of the wrinkle holding plate is reduced during molding, although the material flows from the flange portion to the forming portion, the clamping force of the flange portion is insufficient and wrinkles occur in the flange portion. However, there is a problem that the quality of processed products is deteriorated.

Against such a background, the present inventor repeatedly conducted more thorough experimental research, and found that the optimum configuration capable of achieving the objective of improving the limit forming height while improving the product quality. Heading out, the present invention was completed.

That is, according to the first aspect of the invention, a punch is used to form a base plate made of a resin-laminated aluminum foil having a resin film laminated on at least one side thereof with a die and a wrinkle holding plate sandwiched therebetween. And a surface roughness (Ra) of a surface on which a base plate is installed (a base plate installation surface) as the die is 0.08.
The gist is a method for drawing a resin-laminated aluminum foil, which is characterized in that a film having a thickness of up to 1.0 μm is used.

Here, in the present invention, the surface roughness (Ra)
Is defined by the center line average roughness.

According to the second aspect of the present invention, the base plate made of a resin-laminated aluminum foil having a resin film laminated on at least one surface is sandwiched by a die and a wrinkle holding plate, and is formed by using a punch. In the drawing method, the wrinkle holding plate has a surface roughness (Ra) of 0.08 to 1.
The gist is a method for drawing a resin-laminated aluminum foil, which is characterized in that the one set to 0 μm is used.

Further, according to the invention of claim 3, a base plate made of a resin-laminated aluminum foil having a resin film laminated on at least one surface thereof is sandwiched by a die and a wrinkle holding plate, and is formed by using a punch. In the drawing method described above, a die having a surface roughness (Ra) of a blank plate installation surface set to 0.08 to 1.0 μm is used as the die, and the blank plate pressure contact surface is used as the wrinkle holding plate. The method for drawing a resin-laminated aluminum foil is characterized in that the surface roughness (Ra) thereof is set to 0.08 to 1.0 μm.

According to the first to third aspects of the invention, since the surface roughness of the die plate mounting surface or the blank plate pressure contact surface of the wrinkle holding plate is set to a specific value,
Friction between the die and the wrinkle retainer plate is reduced, and the constituent material in the flange portion of the blank plate flows smoothly toward the punch top surface shoulder portion of the forming part, effectively reducing the wall thickness in the forming part. It can be prevented, and the limit forming height of the forming portion can be improved.

Further, according to the present invention, since the friction between the blank plate and the die is reduced, the wrinkle holding plate can be pressed against the blank plate with a sufficient pressing force, and wrinkles are generated in the drawn product. It is possible to prevent a defect from occurring.

The method inventions according to claims 1 to 3 are:
It can be suitably used when obtaining drawn products such as food packaging containers and electronic component storage containers.

That is, the invention of claim 4 is the same as claim 1
The present invention also provides a drawn product of a resin-laminated aluminum foil, which is obtained by the drawing method according to any one of 1 to 3.

Further, a fifth aspect of the present invention provides a food packaging container characterized by being obtained by the drawing method according to any one of the first to third aspects.

Further, a sixth aspect of the present invention provides a container for storing electronic parts, which is obtained by the drawing method according to any one of the first to third aspects.

The invention described in claims 7 to 9 specifies an apparatus invention capable of carrying out the method invention described in claims 1 to 3.

That is, the invention according to claim 7 is a drawing apparatus for drawing a base plate made of a resin-laminated aluminum foil having a resin film laminated on at least one surface thereof, which is for forming the base plate. A die and a punch, and a wrinkle pressing plate for pressing the blank plate to the die side during molding, and the surface roughness (Ra) of the blank plate installation surface in the die is 0.08 to 1.0 μm. The gist is a drawing apparatus for a resin-laminated aluminum foil, which is characterized in that

Further, the invention according to claim 8 is a drawing apparatus for drawing a base plate made of a resin-laminated aluminum foil having a resin film laminated on at least one surface thereof, which is for forming the base plate. A die and a punch, and a wrinkle holding plate for holding the blank plate to the die side during molding are provided, and the surface roughness (Ra) of the blank plate pressure contact surface of the wrinkle holding plate is 0.08 to 1 The gist is an apparatus for drawing a resin-laminated aluminum foil, which is characterized by being set to 0.0 μm.

Further, the invention according to claim 9 is a drawing apparatus for drawing a base plate made of a resin-laminated aluminum foil having a resin film laminated on at least one surface thereof, which is for forming the base plate. A die and a punch, and a wrinkle pressing plate for pressing the blank plate to the die side during molding, and the surface roughness (Ra) of the blank plate installation surface in the die is 0.08 to 1.0 μm. And a surface roughness (Ra) of the blank plate pressure contact surface of the wrinkle holding plate is set to 0.08 to 1.0 μm. It is a summary.

[0030]

1 is a schematic sectional view of a drawing apparatus according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a die (10) applied to the apparatus.

As shown in both figures, the drawing apparatus according to this embodiment basically includes a die (10) as a female die, a punch (20) as a male die, and a wrinkle holding plate (30). (1) which is provided as a general structure and is a blank such as a plate blank
Is cold-formed to produce drawn products such as food containers, lithium-ion polymer battery containers, and capacitors.

Die (10) in this drawing device
Has a die hole (11) having a shape corresponding to the outer shape of the processed product to be manufactured in the center, and the installation surface (12) on which the raw plate (1) is installed is ground to produce a rough surface. (Ra) is set to 0.08 to 1.0 μm.

Here, in this embodiment, the surface roughness (R
If the value of a) is too small or too large, the friction with the base plate (1) will increase, and the movement of the meat during molding, which will be described later, cannot be performed smoothly, which is not preferable.

In FIG. 2, the arrow mark (G) indicates the grinding direction.

The punch (20) has a top surface portion (21) having a shape corresponding to the inner shape of the processed product to be manufactured and the inner shape of the die hole (11), and the top surface portion (21) is the die (10). )
It is configured so that it can be inserted into and removed from the die hole (11).

The wrinkle retainer plate (30) has a through hole (31) formed in the center corresponding to the die hole (11).
The one surface side, in other words, the pressure contact surface (32) side with the base plate (1) is configured to be movable in a direction in which it comes in contact with and separates from the installation surface (12) of the die (10).

On the other hand, the base plate (1) used in this embodiment is composed of a resin-laminated aluminum foil made of an aluminum foil in which resin films are laminated and integrated on both sides.

In this embodiment, the base plate (1) preferably has a thickness of 30 to 50 μm.

As the resin film to be further laminated, a film made of a synthetic resin such as polyvinyl chloride resin, polypropylene resin, polyethylene resin, polyester resin or nylon can be preferably used.

In this embodiment, the blank plate (1) described above is used.
In order to draw with the above processing device, the blank plate (1) is installed on the installation surface (12) of the die (11),
The wrinkle retainer plate (30) has its pressure contact surface (32) with the blank plate (1)
The blank plate (1) is sandwiched by the die (11) and the crease presser plate (30) by being pressed against the blank plate (1), and the punch (20) is driven in this state to drive a required portion (molding portion 1) of the blank plate (1).
a) is cold-formed.

At the time of this molding, since the installation surface (12) of the blank plate (1) in the die (10) is formed to have an appropriate surface roughness, the space between the blank plate (1) and the die (10) is small. Friction is reduced, and the portion (flange portion 1) sandwiched by the die (10) and the crease presser plate (30) in the blank plate (1).
The constituent material of b) smoothly flows along with the deformation of the molding part (1b), particularly toward the punch top surface shoulder part (breakage risk part) of the molding part (1b), and the movement of the meat causes the molding part to move. It is possible to effectively prevent the decrease in wall thickness in (1b). Therefore, it is possible to improve the limit forming height of the forming portion (1b).

Further, in this embodiment, since the friction between the blank plate (1) and the die (10) is reduced,
The wrinkle holding plate (30) can be pressed against the base plate (1) with a sufficient pressing force. Therefore, wrinkles do not occur in the drawn product, and high quality can be obtained.

Further, in the present embodiment, since it is not necessary to mix a lubricant or the like in the resin layer of the base plate (1), the base plate (1) can be easily manufactured and the material cost can be reduced accordingly. You can

Further, in the present embodiment, the die (10)
Unlike the method of mirror-finishing the surface of the die such as the punch or the punch (20), it does not require troublesome processing such as grinding and polishing, so that the die can be easily manufactured.

Further, in this embodiment, unlike the case where the lubricant is supplied to the mold, it is not necessary to remove the lubricant after the molding, so that the molding process can be performed efficiently and the cost can be reduced. Can be planned.

Further, in the present embodiment, since a special structure such as a mechanism for controlling the pressing force of the wrinkle pressing plate and a mechanism having a plurality of punches is not required, the structure can be simplified accordingly. In addition, the cost can be further reduced.

In the above embodiment, the die (1
The case where only the surface roughness of the installation surface (12) in (0) is set within a predetermined range has been described, but the present invention is not limited to this, and the surface roughness of the pressure contact surface (32) in the wrinkle holding plate (30) is not limited thereto. Within a predetermined range (Ra = 0.0
8 to 1.0 μm), the surface roughness of both the installation surface (12) of the die (10) and the pressure contact surface (32) of the wrinkle holding plate (30) falls within a predetermined range (Ra = 0). 0.08 to 1.0
μm), and in this case, the same effect as above can be obtained.

In the present invention, however, the die (10)
When the surface roughness of the installation surface (12) in (1) is set within the above-mentioned predetermined range, wrinkles are prevented from occurring, and the molding part (1
The movement of the meat to a) can be performed more efficiently, and the above effect can be obtained more reliably.

The processing method of the present invention can also be applied to combined processing of drawing and overhanging in which the top surface of the punch is also extended.

<Example> On the surface of an aluminum foil having a thickness of 40 μm, ON (biaxially stretched nylon) having a thickness of 25 μm was laminated and integrated as a surface layer, and on the back surface, CPP (unstretched) having a thickness of 30 μm was used as a back surface layer. A 30 mm × 30 mm base plate (1) in which polypropylene) was laminated and integrated was prepared.

The surface roughness (Ra) of the installation surface (12) was 0.08 to 1.0 μm (Ra in the grinding direction =
0.08 μm, Ra = 0.25 μm in the direction perpendicular to the grinding), and cold forming the blank plate (1) by using a drawing device configured in the same manner as in the above embodiment. As a result, a container-shaped drawn product was manufactured.

At this time, the limit forming height of the processed product is 1
It was 2.6 mm.

The coefficient of friction between the surface layer (ON side) of the blank plate (1) and the installation surface (12) of the die (10) was measured and found to be 0.17 in both the grinding direction and the grinding perpendicular direction. It was

<Comparative Example> A drawing process was performed in the same manner as in the above-described example except that a die whose surface roughness (Ra) of the installation surface was set to 0.03 μm by mirror finishing was used.

At this time, the limit forming height of the processed product is
It was 9.6 mm.

The coefficient of friction between the surface layer (ON side) of the blank and the die mounting surface was measured and found to be 0.24.

As described above, it can be seen that the examples related to the present invention have higher limit forming height and lower friction coefficient than the comparative examples.

As is clear from the results of the above-mentioned Examples and Comparative Examples, when the surface roughness (Ra) is 0.03 μm or less, the friction coefficient becomes large and the limiting forming height cannot be improved, whereas the surface roughness (Ra) cannot be improved. If the roughness (Ra) is 0.08m,
It was found that the coefficient of friction is small and the limit forming height can be improved.

<Reference Example> According to the above-mentioned embodiment, the surface roughness (Ra) of the installation surface (12) in the direction perpendicular to the grinding is 0.5.
μm, 1.0 μm, 1.5 μm, 2.0 μm die (1
0) was used for drawing, and the friction coefficient at that time was measured.

As a result, the surface roughness (Ra) is 0.5 μm.
In the case of m and 1.5 μm, the friction coefficient was 0.17, whereas the surface roughness (Ra) was 1.5 μm and 2.0 μm.
In the case of m, the friction coefficient was 0.3 or more.

As is clear from this measurement result and the results of the above Examples and Comparative Examples, the surface roughness (Ra) was 1.5 μm.
If it exceeds m or is less than 0.03 μm, the coefficient of friction becomes large and the limiting forming height cannot be improved, whereas the surface roughness (Ra) is 0.08 μm or more, 1.0 μm.
It was found that those having a thickness of m or less have a small friction coefficient and can improve the limit forming height.

[0062]

As described above, according to the invention described in claims 1 to 3, the surface roughness of the die plate mounting surface or the blank plate pressure contact surface of the wrinkle holding plate is set to a specific value. Therefore, the friction between the blank plate and the die and the wrinkle holding plate is reduced, and the constituent material in the flange portion of the blank plate smoothly flows toward the forming portion, effectively reducing the wall thickness in the forming portion. There is an effect that it can be prevented and the limit forming height of the forming part can be improved.

Since the inventions according to claims 4 to 6 are obtained by the inventions according to claims 1 to 3, the drawing of a container for food packaging, a container for storing electronic parts, etc., having a sufficient depth is performed. There is an effect that the product can be obtained.

Further, since the inventions of claims 7 to 9 specify the invention of the apparatus capable of carrying out the method inventions of claims 1 to 3, the same effects as the above can be obtained.

[Brief description of drawings]

1A and 1B are cross-sectional views schematically showing a drawing apparatus according to an embodiment of the present invention, wherein FIG. 1A is a cross-sectional view showing a raw plate installed immediately before molding, and FIG. 1B is molding. It is sectional drawing shown in the state in the middle.

FIG. 2 is a perspective view showing a die applied to the drawing apparatus of the embodiment.

[Explanation of symbols]

1 ... bare plate 10 ... die 12 ... Base plate installation surface 20 ... Punch 30 ... Wrinkle holding plate 32 ... bare plate pressure contact surface

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Claims (9)

[Claims] 1. A drawing method in which a base plate made of a resin-laminated aluminum foil having a resin film laminated on at least one side is sandwiched by a die and a wrinkle retainer plate and molded using a punch. , The surface roughness (Ra) of the bare plate installation surface of the die is 0.
A method of drawing a resin-laminated aluminum foil, characterized in that a film having a thickness of 08 to 1.0 μm is used. 2. A drawing method in which a base plate made of a resin-laminated aluminum foil having a resin film laminated on at least one surface is sandwiched by a die and a wrinkle retainer plate and molded using a punch. , The surface roughness (Ra) of the blank plate pressure contact surface as the wrinkle pressing plate
Is set to 0.08 to 1.0 μm, and a method for drawing a resin-laminated aluminum foil, characterized in that it is used. 3. A drawing method in which a blank made of a resin-laminated aluminum foil having a resin film laminated on at least one surface thereof is sandwiched by a die and a wrinkle holding plate and is formed by using a punch. , The surface roughness (Ra) of the bare plate installation surface of the die is 0.
The surface roughness (Ra) of the blank plate press-contact surface is used as the wrinkle pressing plate while using the one set to 08 to 1.0 μm.
Is set to 0.08 to 1.0 μm, and a method for drawing a resin-laminated aluminum foil, characterized in that it is used. 4. A drawn product of a resin-laminated aluminum foil, which is obtained by the drawing method according to any one of claims 1 to 3. 5. A food packaging container obtained by the drawing method according to any one of claims 1 to 3. 6. A container for storing electronic parts, which is obtained by the drawing method according to any one of claims 1 to 3. 7. A drawing apparatus for drawing a base plate made of a resin-laminated aluminum foil having a resin film laminated on at least one surface, the die and the punch for forming the base plate, and In this case, a wrinkle pressing plate for pressing the base plate to the die side is provided, and the surface roughness (Ra) of the base plate installation surface in the die is 0.
A drawing apparatus for resin-laminated aluminum foil, which is set to 08 to 1.0 μm. 8. A drawing apparatus for drawing a base plate made of a resin-laminated aluminum foil having a resin film laminated on at least one surface, the die and the punch for forming the base plate, and In this case, a wrinkle pressing plate for pressing the blank plate to the die side is provided, and the surface roughness (Ra) of the blank plate pressing surface of the wrinkle pressing plate.
Is set to 0.08 to 1.0 μm, and an apparatus for drawing a resin-laminated aluminum foil is characterized. 9. A drawing apparatus for drawing a base plate made of a resin-laminated aluminum foil having a resin film laminated on at least one side, the die and the punch for forming the base plate, and In this case, a wrinkle pressing plate for pressing the base plate to the die side is provided, and the surface roughness (Ra) of the base plate installation surface in the die is 0.
The surface roughness (Ra) of the blank press-contact surface of the wrinkle holding plate is set to 08 to 1.0 μm.
Is set to 0.08 to 1.0 μm, and an apparatus for drawing a resin-laminated aluminum foil is characterized.