JP2837502B2 - Long material bending method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for bending a long material for manufacturing a box or the like using the long material.

(Prior Art) The manufacture of a box in sheet metal processing using a conventional long material has been performed by the steps shown in FIG.

(1) Cut the coil material 20 to a predetermined length.

(2) Blanking out a developed shape to be a work by a turret punch press or the like into a predetermined shape (L is the length direction,
W is the height direction).

(3) Bending in the L direction by a press brake or the like.

(4) Next, L-bending is performed to form one side of a box having two adjacent sides (C is a gap).

(5) Combine the two pieces on one side and weld the joints by welding or the like.

The box was manufactured by such a process.

(Problems to be solved by the invention) However, in the above-described method, W / L when blanking is not performed
Is small (eg: 1/20 to 1/50), and the blank bends a as shown in Fig. 4 due to the residual stress of the work and the influence of distortion due to the pressing force during punching. There is. When the blank material that has been bent laterally is bent in the longitudinal direction by a press brake or the like in the next step, both ends of the blank material, which is a work, generate a shift b between the punching position and the bending position, and the joint portion after the L bending is formed. The gap C (FIG. 3 (4)) becomes large, or there is a problem that welding failure occurs frequently due to the interference of excess joints at the joints, requiring extra man-hours for rework.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for bending a long material that prevents a displacement between a longitudinal bending position and a punching position due to a lateral bending of a work. Is what you do.

(Means for Solving the Problems) In order to achieve the above object, a method for bending a long material according to the present invention is directed to a method for processing a long sheet metal including a bending process, wherein a line for separating a wide long material in a longitudinal direction is provided. Are provided on both sides of the separation line, and a development shape region to be a work is taken. From this development shape region, a development shape to be each work is punched while including the separation line, and further, each development shape punched out The end of the work is then bent, and then each of the unfolded shapes is cut off at the separation line to form a work. Further, each unprocessed portion of the cut work is bent to perform a horizontal bending of the work. The displacement of the bending position in the longitudinal direction due to the above is prevented.

(Function) In the method of bending a long material according to the present invention by the above method, a separation line is provided in the longitudinal direction of the long material, and a developed shape region serving as a work is formed on both sides thereof, and the separated line and the developed shape region on both sides are provided. Was blanked at once,
The amount of lateral bending of the material decreases because the ratio W / L of the length direction L to the width direction W increases, and the workpiece is divided after bending both ends, so that the lateral bending disappears, and after the L bending. The accuracy of the mating part is improved.

(Example) Hereinafter, a method for bending a long material of the present invention will be described with reference to FIGS. 1 and 2. FIG.

In this embodiment, all cases will be described as manufacturing the same box as that shown in the conventional example.

In FIG. 1, the upper side of the box is arranged in a state corresponding to a separation line of width A. In the figure, reference numeral 1 denotes a coil material, and in the following, (1) → (2) → (3) →.
The bending process is performed in the step.

(1) The coil material 1 has a width A at least in the center in the longitudinal direction.
Is cut in advance using a wide object at both ends of the separation line, in which the expanded shape of the box can be sufficiently taken, and the adjacent sides of the box are connected to each other.

(2) The cut long material 2 is punched into a predetermined shape by a turret punch press while developing the shape of each work including the separation line. At this time, two unfolded shapes corresponding to the respective workpieces are punched in an inverted shape corresponding to each other across a separation line having a width A. As a result, W / L can be increased. When the ratio of W / L is increased, the lateral bending can be reduced as shown in the lateral bending of the JIS standard in Table 1.

(3) Next, both ends are bent by a press brake. In this case, since the ratio of W / L is large, there is no side bending and accurate bending is performed.

(4) Next, the developed shape area to be the work blanked out by the turret punch press is separated by a cutting line to separate the work into two works. At the time of this separation, since the long material has already been bent, the rigidity is increased, and lateral bending hardly occurs.

(5) After the division, the unprocessed portion is bent, and thereafter, the L-bending process is performed in the same manner as in the related art, the combination is performed, and the joint is welded to obtain a box. In this case, there is no lateral bending in the developed shape to be a workpiece, so that accurate bending can be performed, the deviation between the bending position and the punching position in the longitudinal direction is completely prevented, and the gap between the joining portions is in a close contact state, and there is no welding defect. Becomes

FIG. 2 shows a state where the bottom side of the box corresponds to a cutting line having a width A, and is processed by the same process as in FIG. The numbers indicating the order of the drawings are the same as those in FIG. 1, and the steps from (1) to (5) are followed.

Although the above-described method shown in FIGS. 1 and 2 shows two-cavity, the same effect can be obtained with four-cavity. In this case, it is only necessary to arrange the two-cavities in the upper and lower two stages,
You can add a separation line to the question of the column.

(Effect of the Invention) As described above, according to the present invention, in a method for processing a long sheet metal including bending, a separation line is provided in a longitudinal direction of a wide and long material, and a work is provided on both sides of the separation line. Taking the unfolded shape area, punching out the unfolded shape to be each work from the unfolded shape area while including the separation line, further bending the end of each unfolded unfolded shape, and then performing the separation line In the above, each of the unfolded shapes is separated to form a work, and further, each unprocessed portion of the separated work is bent to prevent displacement of a bending position in a longitudinal direction due to lateral bending of the work. Therefore, there is no gap between the joints after the L-bending and no interference of excess thickness, so that there is no need for welding defects or reworking of the joints, and there is an advantage that the defect rate can be improved and the accuracy can be improved.

[Brief description of the drawings]

FIG. 1 and FIG. 2 show an embodiment of the present invention. FIG. 1 is a working process diagram in which a developed shape region which is an upper side of a box is cut on both sides of a separation line provided in a longitudinal direction, and FIG. FIG. 3 and FIG. 4 show a conventional example in which a developed shape region on the bottom side of the box is cut on both sides of the separating line, FIG. 3 is a conventional example, and FIG. The figure is a blank diagram showing the lateral bending occurring during processing. 1 ... roller material 2 ... long material A ... width of separation line

Claims (1)

(57) [Claims] In a method of processing a long sheet metal including bending, a separation line is provided in a longitudinal direction of a wide long material, and a development shape region serving as a work is formed on both sides of the separation line. From the above, the unfolded shape to be each work is punched while including the separation line, and further, the end of each unfolded unfolded shape is bent, and then the unfolded shape is separated at the separation line to separate the work. Forming an unprocessed portion of each of the separated workpieces to prevent a displacement of a longitudinal bending position due to a lateral bending of the workpiece. .