JPS6029568B2 - Bending method for sine wave shaped thin steel plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for bending a sine wave shaped thin steel plate.

Generally, a sine wave-shaped plate made of thin steel sheet, called a corrugated plate, is lightweight and has a relatively large bending stress, so it is widely used as a variety of building materials and construction materials.

This type of sine wave shaped plate can be bent at any angle as required.

The bending process of the sine wave shaped plate may be carried out along the longitudinal direction of the undulations or perpendicular to the undulations.

Bending perpendicular to the undulations is not as simple as bending along the length of the undulations, and there are various ridges.

That is, when bending is performed perpendicular to the wavy lines, it is difficult to perform the bending process unless the wavy areas to be bent are first flattened.

However, if you flatten the wavy lines at the point where they should be bent, the flattened part of the board will protrude in a direction perpendicular to the wavy lines, resulting in the disadvantage that the width of the bent part will be larger than the width of the other parts. there were.

It is also possible to perform the bending process without flattening the wavy lines at the part to be bent, but even in this case, the wavy lines are crushed by the mold, and as a result, the width of the bent part is larger than that of other parts. becomes larger than the width of the

Furthermore, there is a complication in that both end portions of the bent portion that protrude in a direction perpendicular to the corrugations must be cut.

In view of the above-described drawbacks of the conventional art, the present invention has been developed so that even if a sine wave-shaped plate made of a thin, dull plate is bent at a desired angle perpendicular to the corrugations, the width of the bent part is smaller than that of the other parts. We developed a bending method that prevents the wire from becoming larger than the width.

Embodiments of the present invention will be described below based on the drawings.

1 to 3, reference numeral 1 denotes a lower mold, and the entire length of the upper surface of the mold base, which is rectangular in plane, in the longitudinal direction, is formed into a V-shaped groove la having a cross section at a predetermined angle.

On the slopes on both sides of the V-shaped groove la, a large number of protrusions lb having a semicircular arc cross section and a length extending from the upper end to the vicinity of the lower end of each slope are provided at a required pitch.

The lower end of each protrusion lb has a vertical cross section with a required opposing gap lc.

4 to 6, reference numeral 2 denotes an upper mold, and the total length of the lower surface of the mold base having a rectangular plane is at an angle slightly smaller than the angle of the V-shaped groove la in the lower mold 1. It is formed in a V-shaped cross section.

On the slopes on both sides of this V-shaped lower surface 2a, a large number of V-shaped protrusions 2b having a semicircular arc cross section and continuing across the slopes on both sides are provided at the same pitch as each protrusion lb in the lower mold 1.

Further, the V-shaped lower surface 2 located in the middle of each of the V-shaped protrusions 2b
The lower end of a has a lower end slightly above the lower end of each V-shaped protrusion 2b, a width slightly narrower than the gap between each V-shaped protrusion 2b, and each protrusion lb in the lower mold 1. A tapered insertion protrusion 2c is vertically inserted into the opposing interval lc of the vertical cross section of the lower end.

As shown in FIG. 7, on the upper surface of the lower mold 1, a sine wave plate 3 made of a thin steel plate having peaks 3a having the same pitch as each of the protrusions lb in the lower mold 1 is placed on each of the sine wave shaped plates 3. The upper mold 2 is moved with the back surface of the peak 3a facing each of the protrusions lb, and
The letter-shaped protrusions 2b are pushed down into the V-shaped grooves la in the lower mold 1 while facing the upper surfaces of the valleys 3b in the thin steel sine wave plate 3 on the lower mold 1.

By pressing down the upper mold 2, the thin steel sine wave-shaped plate 3 has each protrusion lb in the lower mold 1 on the back side of the valley portion 3a, and each protrusion lb in the upper mold 2 on the upper surface of the valley portion 3b. The V-shaped protrusions 2b are pressed down into the V-shaped grooves la in the lower mold 1 while being in contact with each other, and the thin steel sine wave-shaped plate 3 is rolled into the corrugations of each peak 3a and each trough 3b. It begins to be bent orthogonally to the required angle. Each of the tapered insertion protrusions 2c vertically provided at the lower end of the V-shaped lower surface 2a of the base in the upper mold 2 is connected to the opposing gap l of the vertical cross section of the lower end of each protrusion lb in the lower mold 1.
When iron is inserted into the sine wave-shaped plate 3 made of thin steel plate 3 through each ridge 3a, each ridge 3a is deep-drawn by each insertion protrusion 2c in the opposing gap lc, forming a wave pattern. It is bent perpendicular to. Further, each valley portion 3b in the thin steel sine wave-shaped plate 3 is bent into an arc shape by the lower end arc surface of each V-shaped protrusion 2b in the upper mold 2.

FIGS. 8 to 11 show a sign wafer-like plate 3 made of a thin steel plate bent by the upper and lower molds 1 and 2. FIG.

In FIG. 8 to FIG. 11, 3c is a bent portion at each peak 3a, and 3d is a bent portion at each trough 3b. 1, deep drawing is performed by each tapered insertion protrusion 2c provided at the lower end of the V-shaped lower surface 2a of the base in the upper mold 2, in the opposing gap lc of the vertical cross section of the lower end of each protrusion lb in the upper mold 2, Since it is bent perpendicular to the corrugations, the overhang in the direction perpendicular to the corrugations can be absorbed by each deep drawing. Even when bent at a desired angle, the width of the bent portion can be made almost the same as the width of the other portions. Note that the lower mold 1 and the upper mold 2 are an embodiment in which a sine wave-shaped plate 3 made of a thin steel plate is bent at approximately 90 degrees orthogonal to the corrugations, and the lower mold 1 and the upper mold 2 are The numerical values of each part in the mold 2 are as follows.

Lower mold I Angle of V-shaped groove la Mottled ridge l
Height of b Arc radius of 1 side ridge lb Pitch of 6 ribs lb
31.8 Opposing gap lc in the vertical section of the lower end of the rib ridge 8 Skin upper mold 2 Angle of the V-shaped lower surface 2a
Angle of 86 degree V-shaped protrusion 2b
Height of 86 degree V-shaped protrusion 2b
Arc radius of IQ side V-shaped protrusion 2b
Pitch of 6 skin V-shaped protrusions 2b 31.8
Width of side insertion protrusion 2c 18 Maximum thickness of side insertion protrusion 2c 7 Skin insertion protrusion 2c
Tip thickness: 2 skins (radius: 1 willow arc) Height of insertion protrusion 2c
14 ribs

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Figure I is a front view of the lower mold, Figure 2 is a plan view of the same, and Figure 3 is the lower mold.
Figure 4 is a side view of the upper mold; Figure 5 is a cross-sectional view taken along line A-A in Figure 4; Figure 6 is a cross-section taken along line B-B in Figure 4. Figure 7 is a vertical cross-sectional side view showing the positional relationship between the lower mold, the thin steel sine wave plate, and the upper mold, and Figure 8 is the main part of the bent thin steel sine wave plate. The plan view, Fig. 9, is Fig. 8 A-A.
10 is a sectional view taken along the line BB in FIG. 8, and FIG. 11 is a side view. Rare 1 figure Rare Z Garden Rare Kindergarten brother 4 figure Rare 5 figure Shooting figure Rare 8 Four threads 7 times digit Evening 4 figures 10 figure Younger brother 11 figure

Claims (1)

[Claims] 1 The entire length of the top surface of the rectangular mold base in the longitudinal direction is formed into a V-shaped groove with a required cross-sectional angle. The upper surface of the lower mold has a large number of protrusions having a semicircular arc cross section and a length extending over the length of the mold. Then, a sine wave-shaped plate made of a thin steel plate having ridges of the same pitch as each of the ridges in the lower mold is placed with the back side of each ridge facing each of the ridges, and a planar rectangular plate is placed. The entire length of the lower surface of the mold base in the longitudinal direction is formed into a V-shaped cross section with a slightly smaller angle than the angle of the V-shaped groove in the lower mold. A large number of V-shaped protrusions having a semi-circular arc cross section continuous across both side slopes are provided at the same pitch as each of the protrusions in the lower mold, and a mold base located intermediate between each of the V-shaped protrusions is provided. At the lower end of the V-shaped lower surface of the table, the lower end is located slightly above the lower end of the V-shaped protrusion, and the width is slightly narrower than the interval between the V-shaped protrusions, and each protrusion in the lower mold An upper mold in which tapered insertion protrusions are hung vertically to be inserted into the opposing gaps in the vertical cross section of the lower end, and each of the V-shaped protrusions in the upper mold is connected to a sine wave made of thin steel plate on the lower mold. 1. A method for bending a sine wave-shaped sheet made of thin steel sheet, the method comprising bending a sine wave-like sheet made of thin steel sheet, the method comprising making the plate face the upper surface of each valley in the sheet metal sheet and pushing the sheet down into a lower mold through the sine-wave sheet sheet made of thin steel sheet.