JPH07119076B2 - Sheet material drawing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for drawing a sheet material such as paper, aluminum foil, and a plastic sheet and subjecting it to the production of caps, containers, and the like.

(Prior Art) FIG. 13 shows a paper cap 102 that covers the mouth of a bottle 101 or the like. The cap 102 is formed by bending a rectangular paper sheet material 103 as shown in FIG. 11 along a bending edge 104 shown by a broken line in the figure as shown in FIG.
A rectangular bottom surface portion 105, four pentagonal outer side surface portions 106, which are partitioned from each other by, and eight rectangular first inner side surface portions 107 which are folded inward of the outer side member.
It is molded into a shape having four triangular second inner side surface portions 108 that are folded inwardly of the first inner side surface portion 107.

Conventionally, such a molding of the cap 102 has been extremely poor in work efficiency because a human has manually performed the molding.

Therefore, for example, as disclosed in JP-A-62-109634, using a draw forming device having a male mold and a female mold,
It is conceivable to form the sheet material 103 into a desired shape by narrowing the sheet material 103 into the female die by the male die.

(Problems to be Solved by the Invention) However, in the conventional draw forming apparatus, when forming into a container shape having a shallow bottom or when the sheet material is folded, the desired shape is formed. However, if a container with a deep bottom, such as the cap 102, or the sheet material is not folded at all from the beginning, it cannot be formed into a desired shape.

In this process, the sheet material 103 is arranged between the male mold 109 and the female mold 110 as shown in FIG. 14, the narrowing is performed as shown in FIG. 15, and the narrowing is completed as shown in FIG. ,
When the bottom is shallow, since the area ratio of the sheet material located outside the mold at the start of narrowing is small, most of the sheet material 103 is guided to the outer peripheral surface of the male mold 109 and the inner peripheral surface of the female mold 110. Thus, it is deformed and bent along the bending edge determined by the shape of the mold to obtain a desired shape.

Further, if the sheet material is provided with creases, it can be bent at the creases to have a desired shape.

On the other hand, when the bottom is deep, the area ratio of the sheet material located outside the mold at the start of narrowing is large, and the portion 103a located outside the mold at the start of narrowing is the male mold 109 at the beginning of narrowing. It is not guided by the outer peripheral surface or the inner peripheral surface of the female die 110, and therefore bends along a bending edge other than the bending edge determined by the shape of the die, resulting in an irregular shape.

Even when the sheet material is not formed with the creases, the sheet material is bent along a bending edge other than the bending edge determined by the shape of the mold, and the sheet is formed into an irregular shape.

Such irregularly shaped caps and containers reduce the commercial value.

(Means for Solving the Problems) An object of the present invention is to provide a sheet material draw forming apparatus that can solve the above-mentioned problems of the prior art.

A feature of the present invention is that it has a male die and a female die, and by narrowing the sheet material into the female die by the male die, the sheet material has a plurality of parts which are divided from each other by bending edges. In the apparatus for forming a shape, a pair of guide members which are inserted into a female mold by a male mold while sandwiching the sheet material are provided, and the sheet material is guided along the bending edges by being guided by the guide members. The guide member is at a point having an edge portion along the bending edge of the sheet material so as to be bent and deformed.

(Operation) According to the configuration of the present invention, when the sheet material is squeezed into the female die by the male die, the pair of guide members sandwiching the sheet material are also inserted into the female die by the male die.

Then, due to the narrowing down, the sheet material is formed into a constant shape having a plurality of portions partitioned by the bent edges.

While the sheet material is being narrowed, the part of the sheet material outside the mold is not guided by the mold, but since the guide member is along the sheet material, it is guided and narrowed down by the guide member.

Further, since the edge portion of the guide member is along the bending edge of the sheet material, the sheet material is guided by the guide member and is narrowed down, so that the sheet material is bent and deformed along a predetermined fixed bending edge. Shaped into a shape.

Further, since the guide member is paired and the sheet material is sandwiched, the guide member can be surely brought along with the sheet material, and the sheet material can be surely molded into a desired shape.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

The sheet material drawing apparatus shown in FIG.
A cap 102 shown in FIG. 13 is molded from a paper sheet material 103, and includes a male mold 2 and a female mold 3 provided in the apparatus main body 1.

The apparatus main body 1 includes a hollow box body 4, a pair of guide columns 5 attached to the box body 4, and an elevating beam 6 that is vertically slidably fitted to the guide columns 5.

The male mold 2 is attached to the lifting beam 6. In this male mold 2, the upper half portion 7 has an octagonal prism shape, and the lower half portion 8 has a pyramidal shape. As shown in FIG. 9, the lower half portion 8 has a rectangular bottom shape, and the side surface shape has trapezoidal portions and triangular portions alternately appearing in the circumferential direction.

An operating lever 9 is swingably attached to the lifting beam 6 about a shaft 10, and a link 11 is attached to the operating lever 9.
The link 11 is swingably attached to the center of the shaft 12, and the link 11 is swingably attached to the center of the shaft 14 through the bracket 13 on the box body 4. As a result, the male mold 2 is moved up and down by holding the operation lever 9 by hand and swinging it up and down to raise and lower the lifting beam 6.

Next, the female die 3 is formed in the central portion of the box body 4.

That is, as shown in FIG. 7 and FIG. 8, a square hole 15 having a square in plan view is opened in the center of the upper surface of the box body 4, and four wall members 16 constituting the female mold 3 are formed in the square hole 15. Four prismatic members 17 are inserted. The prismatic members 17 are arranged along the corners of the square holes 15, and the wall members 16 are inserted between the prismatic members 17 and along the sides of the square holes 15. As a result, the shape of the female die 3 in plan view is substantially along the shape of a cross. Further, the inner surfaces of the wall member 16 and the prismatic member 17 are inclined toward the center as they go downward, so that the distance between the inner surfaces of the female die 3 becomes narrower as they go downward.

Further, four positioning pieces 18 are attached to the upper surface of the box body 4 for placing and positioning the sheet material 103 before molding. By the positioning piece 18, the sheet material 103 is positioned so that each side is inclined by 45 degrees with respect to each side of the square hole 15.

Then, along with the sheet material 103, the male mold 2 is used by the female mold 3
There is provided a male side guide member 19 and a female side guide member 20 which are inserted into.

The male side guide member 19 is formed of a synthetic resin, and is formed by a rectangular bottom portion 21 fixed to the bottom surface of the male die 2 with an adhesive and four trapezoidal side portions 22 integrated with the bottom portion 21. Has been done. Each side of the bottom portion 21 is parallel to each side of the square hole 15. Further, each side portion 22 is supposed to extend from the bottom portion 21 in the radial direction, and the male side guide member 19 has a substantially cross shape in plan view. Further, since the connecting portion 22a between the bottom portion 21 and each side portion 22 is made thin, each side portion 22 can swing about the horizontal axis with respect to the bottom portion 21. This side
The swing axis of 22 is parallel to each side of the square hole 15.

The female guide member 20 is made of synthetic resin and is made of sheet material.
Before molding 103, it is placed on the upper surface of the box body 4 as shown in FIG. The female side guide member 20 has substantially the same shape as the male side guide member 19, and has a rectangular bottom portion 23,
The bottom portion 23 and the four trapezoidal side portions 24 integrated with each other are formed into a substantially cruciform shape in a plan view, and the connecting portions 24a between the side portions 24 and the bottom portion 23 are made thin so that each side portion is formed. 24 is the bottom 2
With respect to 3, it can be swung about the horizontal axis.

Positioning means for the male guide member 20 is provided on the bottom surface of the side portion 24 and the top surface of the box body 4. That is,
As shown in FIG. 10, a strip 25 is attached to the bottom surface of each side portion 24. Further, as shown in FIG. 7, four pairs of strip-shaped pieces 26 that are perpendicular to each side of the square hole 15 are attached to the upper surface of the box body 4. The strips 26 of each pair are separated by the width dimension of the strips 25 on the bottom surface of the side portion 24. As a result, the strips 25 of the male side guide member 20 are positioned between the pair of strips 26, so that each side of the bottom portion 23 has each side of the square hole 15 as shown by phantom lines in FIG. Parallel to the male side guide member 19
And are positioned so as to overlap in a plan view.

Further, four pairs of strip-shaped pieces 27 connected to the strip-shaped pieces 26 are attached to the inner surface of the wall member 16 of the female die 3, and as shown in FIG. Since the strips 25 are located between the pair of strips 26 when inserted, each side of the bottom portion 23 has a square hole even when the female guide member 20 is inserted into the female mold 3. It is parallel to each side of 15.

Further, as shown in FIG. 5, guide step portions 28 are respectively formed on eight inner surfaces of the prismatic member 17 which form the inner peripheral surface of the female die 3. And, each pair of facing timber members
When the side portions 24 of the female side guide member 20 are inserted between the side portions 17, both side ends of each side portion 24 are fitted between the step portion 28 and the wall member 16. Thereby, the female side guide member inserted into the female mold 3
Each side portion 24 of 20 is to follow the inner peripheral surface of the female die 3.

As shown in FIGS. 7 and 8, a guide push-up body 29a is arranged inside the female die 3. This guide pusher 2
9a is attached to one end of the push-up lever 29b. The push-up lever 29b is supported in the box body 4 via a support shaft 30 so as to be vertically swingable about a horizontal axis, and one end of the push-up lever 29b is projected into the opening 31 through an opening 31 formed in the wall member 16 and the other end thereof. Are projected to the outside of the box body 4. This enables the push-up lever
When 29b is swung downward, the guide push-up body 29a moves upward, and the female guide member 20 inserted into the female die 3 is pushed out of the female die 3.

The plan view shape of the bottom portions 21 and 23 of the guide members 19 and 20 is substantially the same as the plan view shape of the bottom surface portion 105 of the sheet material 103, and the side portions 22 and 24 of the guide members 19 and 20 are plan view. The shape is substantially the same as the outer surface portion 106 of the sheet material 103.

That is, each guide member 19, 20 is a bottom surface portion of the cap 102.
Edge 3 along the bending edge 104 that separates 105 and the outer surface portion 106
It has 2,33,34,35.

A procedure for forming the cap 102 by the draw forming apparatus will be described.

First, as shown in FIG. 1, the female guide member 20 is placed on the upper surface of the box body 4, and the sheet material is placed on the female guide member 20.
Place 103 and place the sheet 103 on the positioning piece 18
The female side guide member 20 is added to the sheet material 103 by following the above.

Next, as shown in FIG. 2, the male die 2 is lowered to bring the male side guide member 19 along with the sheet material 103 and sandwich the sheet material with both guide members 19 and 20.

Then, when the male die 2 is further lowered, as shown in FIG. 3, each side portion 2 of the male side guide member 19 and the female side guide member 20.
2, 24 are swung with respect to the bottom portions 21, 23, and the sheet material 103 is inserted into the female mold 3 while being sandwiched between the guide members 19, 20, and the narrowing is started.

Then, as shown in FIG. 4, when the male die 2 is lowered to the lower limit, the side portion 24 of the female side guide member 20 follows the inner surface of the female die 3 and the side portion 22 of the male side guide member 19 is moved to the male side. The male side guide member 19 and the female side guide member 20 along the outer periphery of the lower half portion 8
The forming of the sheet material 103 sandwiched between and is completed.

According to the above draw forming device, the guide members 19 and 20 are inserted into the female mold 3 along with the sheet material 103, and the sheet material 103 is sandwiched between the guide members 103. As shown in FIG. 3, even when most of the sheet material 103 is outside the mold, the sheet material 103 is guided and narrowed down by the guide members 19 and 20.

Each of the guide members 19 and 20 includes a bottom surface portion 105 of the cap 102 having a desired shape formed from the sheet material 103 and an outer side surface portion.
Since the sheet material 103 has the edge portions 32, 33, 34, 36 along the bending edge 104 that divides the sheet 106, the sheet material 103 is bent and deformed along the predetermined bending edge 104 and formed into a constant shape.

That is, the bottom surface portion 105 of the cap 102 is formed by bending and deforming along the edge portion 32 of the bottom portion 21 of the male side guide member 19 and the edge portion 34 of the bottom portion 23 of the female side guide member 20, and both bottom portions 2
A fold line is formed at the bent edge 104c by being sandwiched between 1,23.

Further, the outer side surface portion 106 of the cap 102 is a female side guide member.
Edge 33 of side 22 of 19 and edge 24 of side 24 of female guide member 20
It is formed by bending along 35 and, and in the state where the narrowing is completed, as shown in FIG.
The side portion 22 of the male side guide member 19 and the side portion 24 of the female side guide member 20.
The bent edge 104a is sandwiched between the columnar member 17 and the prismatic member 17.
A fold is formed in the.

Although the guide members 19 and 20 do not lie along the first inner side surface portion 107 and the second inner side surface portion 108 of the cap 102, as shown in FIG. 5, both inner side surface portions 107 and 108 are When the outer side surface portion 106 is guided by the guide members 19 and 20, the outer side surface portion 106 is guided between the male die 2 and the male side guide member 19 and bent and deformed along the bending edge 104b. A fold is formed. As described above, the guide member does not have to fit along the portion defined by all the bending edges, and the corresponding portion may be appropriately determined so that the sheet material can be molded into a desired shape.

According to the above draw forming device, the sheet material 103 is not limited to the male mold 2 and the female mold 3, but the male side guide member 19 and the female side guide member.
By being guided and bent also by 20, it is possible to form a desired shape even when forming a deep-bottomed one.

The present invention is not limited to the above embodiment.

For example, although the molded object is the cap 102 in the above embodiment, it may be a container, and the size, shape, application, etc. of the molded object are not limited. For example, the bottom shape is a triangle or a pentagon. The present invention can also be applied to the case of molding a polygonal container.

Further, the sheet material is not limited to the paper 103, and may be, for example, an aluminum foil or a plastic sheet, and the material is not limited.

Further, by sandwiching the sheet material with a pair of guide members, the bending deformation of the sheet material can be guided more reliably, but a single guide member may be used. For example, only one of the male side guide member 19 and the female side guide member 20 may be provided in the above embodiment.

Further, in the above-mentioned embodiment, the guide member is supposed to go along with five of the portions defined by the bent edges of the sheet material.
As described above, the number is not limited as long as it can be molded into a desired shape, and may be appropriately determined according to the molded shape.

Also, it is not essential that a fold line be formed on the bending edge,
For example, the present invention can be applied to the case of molding a sheet material into a shape having a curved surface.

Further, although the operating lever 9 and the push-up lever 29b are manually operated in the above embodiment, they may be automated.

(Effect of the Invention) According to the draw forming apparatus of the present invention, even if a sheet material is drawn into a deep bottom shape, or even if the sheet material is not folded at all from the beginning, the sheet material is formed by the guide member. Since the bending deformation is guided, it can be formed into a desired shape.

Further, by guiding the deformation by sandwiching the sheet material with a pair of guide members, it is possible to more surely form the desired shape.

[Brief description of drawings]

1 to 10 relate to an embodiment of the present invention. FIGS. 1 to 4 are side cross-sectional views of a draw forming apparatus in different states, and FIG. 5 is a line V-V in FIG. FIG. 6 is a perspective view of the drawing apparatus, FIG. 7 is a plan view of the female mold, FIG. 8 is a side sectional view of the drawing apparatus with the female guide member removed, and FIG. Is a bottom view of the male shape, FIG. 10 is a bottom view of the female guide member, FIG. 11 is a development view of the cap, FIG. 12 is a perspective view of the cap, FIG. 13 is a usage state view of the cap, and FIG. 16 to 16 are explanatory views of the operation of the conventional draw forming apparatus. (2) …… Male type, (3) …… Female type, (19) …… Male side guide member, (20) …… Female side guide member, (32) (33) (3
4) (35) …… edge, (103) …… sheet material, (104)…
… Bending edge.

Claims (1)

[Claims] 1. A male mold and a female mold are provided, and by narrowing the sheet material into the female mold by the male mold, the sheet material is molded into a constant shape having a plurality of portions partitioned from each other by bending edges. In the apparatus, a pair of guide members that are inserted into the female mold by the male mold while sandwiching the sheet material are provided, and the sheet material is bent and deformed along the bending edge by being guided by the guide members. In addition, the guide member has an edge portion along the bending edge of the sheet material, and a drawing apparatus for sheet material.