JPS5927251B2 - Corrugated plate bending device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a corrugated plate folding device for bending a corrugated plate having continuous concave and convex lines alternately at right angles to the concave and convex lines.

The corrugated plate is characterized by being difficult to bend perpendicular to the uneven stripes, and was formed for this purpose.

However, there are many cases where it is necessary to use the corrugated plate by bending it in a direction perpendicular to the corrugated lines. In such cases, it is extremely difficult to bend the board using normal methods, and if the bending is forced, the uneven stripes at the bent part will be bent in a complicated manner, causing cracks in the corrugated board, making it unusable. For this reason, recently, as shown in Figs. 1 and 2, the lower end surface is made into a protruding tapered surface 2 in order to adapt to the desired bending angle of the corrugated plate 1 to be bent. A male die 4 having a fitting uneven strip 3 having a depth matching the depth of the uneven grooves 1a of the corrugated plate 1 on 2, and a protruding tapered surface 2 of the male die 4.
A recessed tapered surface 5 that fits is provided at the center of the upper end surface, a recessed tapered surface 5 is provided with a recessed concave and convex strip 6 that matches the fitting concave and convex strip 3 of the male mold 4, and the upper end of the recessed tapered surface 5 A corrugated plate bending device (Japanese Patent Publication No. 14986) was developed, which consists of a female die 8 with a corrugated plate mounting pattern 1 formed on both sides of the edge, but this bending device has the following drawbacks. In particular, in a corrugated plate in which the width of the protrusions on the inside of the bend is narrow and the distance between them is wide, this defect is conspicuous and the use thereof cannot be tolerated. That is, the above-mentioned bending device
As shown in the figure, after placing the concave and convex strips 1a of the corrugated plate 1 on the receiving concave and convex strips 6 that protrude above the corrugated plate mounting surface T of the female die 8, the fitting concave and convex strips 3 of the male die 4 are placed. The corrugated plate 1 is adapted to the concavo-convex strips 1a of the corrugated plate 1 and pressed down with the required pressure to bend the corrugated plate 1 along the invaginated tapered surface 5 of the female mold 8 as shown in FIGS. 3 and 4. However, in this case, the uneven strips 1 of the corrugated plate 1
Since a is clamped and restrained by the fitting grooves 3 of the male die 4 and the receiving grooves 6 of the female die 8, the grooves of the corrugated plate 1 are pushed by the protrusions of the male die 4 and are pressed against the grooves of the female die 8. This will extend toward the bottom of the invaginated tapered surface 5, and the bent portion of the convex strip of the corrugated plate 1 will be greatly wrinkled, resulting in an extreme difference in the thickness of the plate near the bent portion and its It has the drawback that cracks may appear at the corners of the uneven stripes 1a, and it cannot be used.

Therefore, the inventor of the present invention made an earnest effort to solve the drawbacks of the conventional folding device for corrugated plates, and as a result, the convex strips of the corrugated plates, which are compressed in the longitudinal direction of the corrugated plates by bending, are We have discovered an improved folding device for corrugated plates that does not cause wrinkles at the bent portions of the corrugated plates, provides uniform board thickness, and prevents cracks from forming at the corners of the uneven stripes at the bent portions. It is something that

Hereinafter, one embodiment of the corrugated plate bending device according to the present invention will be described with reference to the drawings.
is provided with a circular groove 9 having a diameter larger than the width of the groove 3a at the center of the tip of each groove 3a of the fitting groove 3' on the protruding tapered surface 2' at the lower end, and The grooved line 3a
A circular punch 1 has an auxiliary protruding tapered surface 2a to compensate for the missing portion, and a protrusion 10 is formed at the tip of the protruding tapered surface 2a.
1 are fitted and fixed with a round key 12.

The female die 8'' corresponding to the male die 4'' has a recessed tapered surface 5' that fits the protruding tapered surface 2'' of the male die 4' formed at the center of its upper end surface, as shown in FIGS. 6A and 6B. , said male type 4″
A receiving concave and convex strip 6' that fits the fitting concave and convex strip 3'' is provided, and a groove 13 having the same depth as the concave strip 6b is provided at the center bottom of each convex strip 6a of the receiving concave and convex strip 6''. be.

That is, each convex strip 6a divides the member constituting it into left and right halves, and fixes each of them at a predetermined position on the invaginated tapered surface 5'' by a dovetail fitting 14, forming a groove 13 in the center bottom part, and The upper end portion slightly protrudes above the corrugated plate mounting surface 71.
Next, by the corrugated plate bending device of the present invention comprising the male die 1 and the female die 8' having such a structure, the fitting uneven strip 3' of the male die 4'' is folded.
In order to bend a corrugated plate having a shape adapted to the receiving grooves and grooves 6' of the female mold 8', first, as shown in FIG. It is placed in conformity with the protruding stripes 6a that protrude above the placement surface 71.

Next, the fitting uneven strip 31 of the male mold 1 is replaced with the uneven fitting strip 1 of the corrugated plate 11.
a'' and press down with the required pressure. By this downward pressing of the male die 4!, the corrugated plate ``is bent according to the invaginated tapered surface 51 of the female die 8''. At the time of bending, first, when the tip of the convex strip of the male die 4'' enters the concave strip of the corrugated plate 1'', the center of the concave strip 3a of the male die 4'' will be placed on the upper surface of the convex strip of that part. The protrusion 10 at the tip of the circular punch 11 that has been fitted and fixed comes into contact with the corrugated plate, gradually causing the convex strip of the corrugated plate to partially cave in along the shape of the protrusion 10, and eventually bend the convex strip at the concave portion. The tip of the protruding strip of the male mold 1 is a corrugated plate 4
′ will be bent. The concave and convex strips 1a'' of the corrugated plate 1' being bent in this way are gradually held and restrained by the mating concave and convex strips 3'' of the male die 4'' and the receiving concave and convex strips 6'' of the female die 8''. Therefore, the upper surface of the convex strip of the corrugated plate 1'' is subjected to a compressive force in the direction of the strip axis and extends from left and right toward the bottom of the invaginated tapered surface 5' of the female die 8'', resulting in the folding shown in FIG. At the final stage of bending, both sides of the corrugated plate 17 come into close contact with the mating grooves 3') of the male die 4' and the receiving grooves 6' of the female die 8', and the grooves 1a' are completely clamped and restrained. Therefore, the bent and stretched portion 15 on the upper surface of the convex strip of the corrugated plate caused by the bending is inside the groove 13 formed at the bottom of the convex strip of the female die 8'', as shown in an enlarged view in FIG. I ended up running away.

As a result, no complicated wrinkles occur at the bent portion of the corrugated plate 1', the thickness of the corrugated plate 1'' is uniform in all parts, and the bent portion of the corrugated plate 1' has a concave width of the male mold 1. Due to the presence of the circular punch 11 having a larger diameter than the circular punch 11, it is not restrained by the side surface of the convex part of the male die 4'', so it expands, and the uneven line 1 at the bent part
No unreasonable bending load is applied to the corners of a'', and therefore no cracks occur.In addition, the protrusion 10 at the tip of the concave strip of the male die 4'' in the above embodiment and the female die The shape of the groove 13 at the bottom of the convex strip 81 can be changed as appropriate, for example, as shown in FIG. It is subject to change.

As can be seen from the above explanation, the corrugated plate bending device according to the present invention can make the entire corrugated plate uniform in thickness and shape without causing wrinkles in the bent portion of the corrugated plate, and furthermore, can make the entire corrugated plate uniform in thickness and shape. It has the excellent effect of being easily bent without causing cracks at the corners of the uneven strips, and greatly contributes to expanding the range of use of corrugated plates.

[Brief explanation of drawings]

1 to 4 show a conventional corrugated plate folding device, and FIG. 1 is a perspective view showing the state before the male and female molds are fitted together;
Figure 2 is a side view showing the state before press fitting with the corrugated plate placed on the female mold and the male mold in contact with the corrugated plate, Figure 3 is its front view, and Figure 4 is the corrugated plate. 3 is a sectional view taken along the line A-A in FIG. 3, and FIGS. 5A and 5B are a plan view of the male type of the corrugated plate bending device according to the present invention, and a sectional view taken along the line B-B of the same plan view. , FIGS. 6A and 6B are a plan view of the female type of the folding device for a corrugated plate according to the present invention, and a sectional view taken along the line C-C of the same plan view, and FIG. 7 is a book showing the state before bending the corrugated plate. FIG. 8 is a cross-sectional view of the main part of the corrugated plate bending apparatus according to the invention, FIG. FIG. 10 is an enlarged cross-sectional view of section D, and is a cross-sectional view showing a modification of the portion shown in FIG. 9. 1, 1'... Corrugated plate, 1a, 1a''...
- Concave and convex stripes of corrugated plate, 2, 2'... Protruding tapered surface, 2a... Auxiliary protruding tapered surface, 3, 3''...
...Mating uneven strip, 4,4''...Male type, 5,5
′...Invaginated tapered surface, 6,6″...Receiving concave and convex stripes, 7,7′...Corrugated plate mounting surface, 8,8′
...Female type, 9...Circular groove, 10...
・Protrusion, 11...Circular punch, 12...
...Round key, 13...Groove, 14...Dovetail groove fitting, 15...Bending and extending portion of corrugated plate.

Claims (1)

[Claims] 1. A male mold having a protruding tapered surface at the lower end formed to adapt to the bending angle of the corrugated plate to be bent, with a mating uneven strip that matches the depth of the uneven strip of the corrugated plate to be bent. and a female mold having a recessed tapered surface formed to match the protruding tapered surface of the male mold, and a female mold provided with receiving grooves and grooves that match the fitting grooves and grooves of the male mold. , a protrusion wider than the groove is provided at the tip of the male fitting uneven groove, and a groove having the same depth as the groove is provided at the bottom of the female receiving groove. A corrugated plate bending device featuring: