JPS6010815B2 - How to bend plate materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for bending a plate material whose thickness is smaller than the width of the plate in the width direction within a plane in the relationship between the plate thickness and the plate width.

Conventionally, as an example of a method for bending a plate material within a plane, rolling loaves a and a are set opposite each other so that their respective central axes have a predetermined angle, as shown in FIG. There is a method of bending plate material b by rolling it thinner than
As shown in FIG. 7, there is a problem in that wrinkles e are likely to occur due to bending of the plate material b. Incidentally, although it is possible to obtain a curved plate material by blanking out a large plate without performing the above-mentioned bending process of the plate material, there is a drawback that a large amount of leftover material is generated when the plate is punched out.

In view of this, the present invention eliminates the bending marks such as wrinkles by pressing both the upper and lower surfaces of the plate with a pair of dies so that the plate thickness gradually becomes thinner in the width direction from one side of the plate to the other. To provide a method that can smoothly bend a plate material within a plane without causing bending.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below based on embodiments with reference to the drawings.

In Fig. 1, 1 is a stay for an automobile clutch pedal obtained from plate material 2, which will be described later, and the part from the center in the length direction to the tip was bent in the width direction of the plate in a plane by the method described below. It is something.

In addition, in the figure, 7 is a pin hole for pivotally supporting the stay 1 to the vehicle body. In the relationship between the plate thickness t and the plate width w, the plate material 2 is formed so that the plate thickness t is smaller than the plate width w, and the plate material 2
As shown in FIG. 2, the upper surface 5 and lower surface 6 of the plate material 2 are bent using a pair of dies 13 and 16, which will be described later, so that the thickness of the plate material 2 gradually becomes thinner in the width direction from one side 3 to the other side 4. Pressurize,
The plate material 2 is bent using the difference in elongation rate on both sides of the plate material due to the pressure, and the bending process is repeated at multiple locations in the length direction of the plate material 2 to smoothly bend the plate material 2 within a plane. be.

First, as shown in FIG. 3, a tapered plate material 2 is formed from a material 8 by shearing, and the plate material 2 is transferred to a press machine (to be described later).
Pressurize with a river trowel.

The press device 10 includes an upper die seat 11, a die support plate 12,
It is composed of an upper die 13, a guide post 14, a lower die seat 15, a lower die 16, a die cushion 17, a guide tube 18, and a rubber 19. Note that 20 is a ram. The upper die 13 has a trapezoidal pressure surface and a top surface 21.
is inclined in the width direction of the plate material 2, and the slope 22 is formed in a triangular shape with the lower end of the slope of the top surface 21 as the apex. A top surface 23 and a slope 24 are formed. The lower die 16 is fixed to the lower die seat 15, and the dictation Q7 is urged upward by a rubber 19, and FIG. 4 shows the upper die seat 1.
1 indicates a descending state. The plate material 2 is placed on the duct 17 as shown in FIG. 5, and attached to the positioning stand 25 so that the center portion of the plate material 2 is located between the jigs 26 and 27 whose support surfaces are curved.

Then, the upper die 13 is lowered and the plate material 2 is pressed by the upper die 13 and the lower die 16. Due to this pressure, both sides of the central part of the plate material 2 are thinned while forming coning surfaces 30, 30 consisting of rectangular slopes 31 and triangular slopes 32 corresponding to the shapes of the pressurizing surfaces of the upper die 13 and the lower die 16. The side edge 4 is extended, and the plate material 2 is moved between the die support plate 12 and the die cushion 17 along the rear surface of the slings 26 and 27.
Bent in the board width direction on the same plane as the board. In this example, for the initial plate thickness t=6 ribs, the amount of coining is 0 on the thicker side 3, and 0 on the thinner side 4.
There are 5 to 1 legs, and the thickness of the thinner side will be 4 to 5 legs. The bending process of the plate material 2 is carried out by applying pressure by the dies 13 and 16 to a plurality of locations by sequentially changing the pressurizing position while intermittently transporting the plate material 2 using the single press device 101 and the trowel by a transfer means (not shown). As a result, a plate material with a predetermined curvature can be obtained.

The amount of coining and the interval between coining positions are appropriately determined depending on the degree of curvature of the product to be obtained from the plate material 2.

As described above, according to the present invention, since the plate material is bent within a plane by applying pressure on both sides of the plate material by a pair of dies, there is no wrinkles as in the conventional method, and a product with an excellent appearance can be obtained. In addition, the plate material can be removed from large sheet metal without causing any waste due to shearing.
An excellent effect can be obtained in that the product has a high quality.

Brief explanation of the data drawings FIGS. 1 to 6 illustrate embodiments of the present invention, FIG. 1 is a plan view of a product obtained by bending a plate material, FIG. 2 is a perspective view of the main parts, FIG. 3 is a plan view showing the state of material removal, FIG. 4 is a vertical cross-sectional view of the press device, and FIG. 5 is a plan view taken along line V-V in FIG. 4 excluding the upper mold.
FIG. 6 is a front view showing a conventional press state, and FIG. 7 is a plan view thereof.

1. …．・Stay, 2... Plate material, 3, 4...
...Side, 5...Top surface, 6...Bottom surface,
8...Material, 10...Putares device,
13... Upper die, 16... Lower die, 21.
... Top surface of the upper die, 22 ... Slope of the upper die, 23 ... Top surface of the lower die, 24 ...
... Lower die slope, 25 ... Positioning base,
26, 27... Pick-up, 30... Conning surface, 31... Rectangular oblique 0 surface, 32... Triangular slope.

hair figure hair 2 diagram Figure 3 Diagram that comes out hair 5 diagram Heron 5 Figure 7

Claims (1)

[Claims] 1 A method of bending a plate material whose thickness is smaller than the plate width in the relationship between plate thickness and plate width, in which the plate thickness gradually becomes thinner in the width direction from one side of the plate to the opposite side. Then, the upper and lower surfaces of the plate are pressed by a pair of dies whose pressing surfaces are inclined in the width direction of the plate to bend a part of the plate in a plane, and the bending process is performed while the plate is intermittently transferred. A method of bending a plate material, which is characterized by bending the plate material smoothly in a plane by repeating the process at multiple locations in the length direction.