JPS61229418A - Straightening method for bandlike material plate - Google Patents

Abstract

PURPOSE:To smooth operation and to increase a yield by carrying out compression forming of a bandlike material plate in the lateral direction of the plate using a pressing jig and carrying out plastic forming on a bead part at side parts of the material plate with the material plate compressed. CONSTITUTION:Lower dies 2 at both sides of a straightening die 20 are provided with slide cams 22 having a linear pressing surface 21 as the pressing jig. An upper die 4 fixed on a press ram 3 is provided with two drive cams 24 corresponding to the slide cams 22 respectively. A bead forming part 31 is formed on the straightening die 20. A straightening punch 32 generating a permanent deformation on the side of the material plate W is put on the upper die 4. The bandlike material plate W is moved from an uncoiler onto the straightening die 20 and the upper die 4 is moved down. The cams 22 are moved horizontally by an inclined plane 26 of the cams 24 to compress both sides of the material plate W. Then a permanent deformation is formed on the bead part B through the punch 32. The operation is smoothed and the yield is increased by straightening of snaking motion of the material plate W.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for straightening a strip-shaped blank plate for straightening a side surface of a strip-shaped blank plate for press working into a straight line.

(Conventional technology) Pressed products are formed by subjecting a blank to press processing such as shearing or drawing, and usually a predetermined press process is performed while sequentially unrolling a strip-shaped blank plate wound in a coil shape. Ru.

FIG. 3.4 is a diagram showing a press die P conventionally used for punching a workpiece Wa of a predetermined shape from a strip-shaped blank W. By further performing drawing processing, edge bending processing, drilling processing, etc. on the workpiece Wa obtained by the press die P for use in this way, final products such as panel materials constituting automobile bodies, etc. are produced. is obtained.

The press mold shown in Fig. 3.4 has a lower mold 2 fixed to a bolster 1, and an upper mold 4 fixed to a press ram 3 which is vertically movable above the lower mold 2. As shown in Figure 3, a workpiece Wa to be blanked (blanked)
A die 6 is attached to the lower die 2, and a die 6 is formed with a cutting edge 5 having a shape corresponding to the outer peripheral contour of the die. A punch 8 on which a cutting edge 7 is formed is attached to the upper die 4 to strike the strip-shaped blank W in cooperation with the cutting edge 5 of the die 6. A pad 9 for clamping with the die 6 is attached to the upper die 4 by a bolt 10 so as to be able to move up and down.A coil spring or the like is installed between the pads and the upper die 4 to provide this clamping force. An elastic body 11 is attached.

The strip-shaped blank sheet W in a coiled shape is sequentially unwound from an uncoiler (not shown) and is carried onto the upper surface of the die 6 as shown by arrows in FIG.

In order to position the strip-shaped blank W with respect to the die 6, a guide roller 12 is rotatably attached to the bolster 1 with bolts 13.

This guide roller 12 is formed with a groove 14 in which the blank plate W is engaged. In FIG. 4, the right half shows the state before the hammering process, and the left half shows the state after the batting process.

(Problems to be Solved by the Invention) The strip-shaped blank sheet W to be subjected to the above-mentioned stamping process or other pressing process has a meandering shape in the width direction of the blank sheet W, as shown in an exaggerated manner in FIG. 3.5. There may be cases where When the meandering blank sheet W is conveyed to the press die, in the conventional press die, the blank sheet W is moved to a predetermined position with respect to the die 6 by the guide rollers 12. I was doing positioning. For this reason, depending on the value of the meandering dimension, it may be difficult to smoothly transport the strip-shaped blank sheet W into the press die. Furthermore, when positioning the blank W using the guide rollers 12 as in the conventional press die shown in Fig. 3.4, the side surface of the blank W may be deformed, and the meandering of the blank may be corrected. It may not be done.

As shown in FIG. 5, if the blank sheet W is meandering as shown by the solid line with respect to the reference contour line of the blank sheet W shown by the imaginary line, the required dimension A of the workpiece Wa to be the product is ,
Considering the case where the meandering is not corrected as described above, the value must be set smaller than the value obtained by subtracting the meandering dimension C from the width dimension of the blank sheet W. Therefore, the portion of the blank W that becomes scrap when the work Wa is handled must be set to a value that also includes the meandering dimension C, resulting in poor yield.

For this reason, when a conventional press die is used, if the strip blank meanders in the width direction, it is not only difficult to smoothly insert the blank sheet W into the press die. However, there was a problem in that the dimensions of the excess material that would be scrapped had to be set large.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to reliably correct the meandering in the width direction of a strip-shaped blank sheet, thereby facilitating the conveyance of this blank sheet into a press mold, Furthermore, the object is to enable high-yield processing that can reduce scrap parts.

(Means for Solving the Problems) The present invention for achieving the above object uses a pressing jig having a linear pressing surface of a predetermined length to apply pressure to the belt-shaped blank plate. A compressive force is applied in the width direction of the blank plate to form a side surface of the strip-shaped blank plate into a straight line, and a bead portion is plastically worked on the side part of the strip-shaped blank plate while the compressive force is applied. This is a method for straightening a strip-shaped blank plate, which is characterized by the following.

(Operation) When compressive force is applied in the width direction to a strip-shaped blank plate using a pressure jig, even if there is a meandering part, the sides of the blank plate become straight in the width direction. It deforms elastically. Next, when a bead is plastically worked on the side of the blank plate, the bead becomes a permanently deformed part, and the pressure jig prevents the elastically deformed part from returning, freezing the straight side shape. .

As a result, even if the strip-shaped blank plate has meandering, it is possible to press the blank plate in a state where the meandering is reliably corrected.
Processing with a high yield is achieved without considering meandering dimensions at all.

(Example) Hereinafter, an example of the present invention illustrated in the drawings will be described. Fig. 1.2 is a diagram showing a straightening device Q that embodies the method for straightening a strip blank sheet according to the present invention, and this straightening device Q is shown in Fig. 3.4 for processing a blank sheet W by beating. It is provided integrally with and adjacent to the press mold P.

Of the lower die 2 shown in Figure 3.4, the press die P for handling
A straightening die 20 that comes into contact with the back surface of the blank sheet W and supports the blank sheet W is attached to a portion adjacent to the blank sheet W. The straightening die 20 has a flat upper surface, and has a width that is equal to or slightly smaller than the width of the blank W.

As shown in FIG. 1, on the upper mold 2 on both sides of the straightening die 20, there are two slide cams 22 each having a predetermined length L and each having a linear pressure surface 21 formed thereon. The slide cam 22 is movable toward and away from the straightening die 20 as a tool.The movement of the slide cam 22 is guided by guides 23 on both end surfaces and by a plate (not shown) on the lower surface. .

In order to drive the straightening die 20, the upper mold 4 is fixed to a press ram 3 which is vertically movable above the lower mold 2.
Two drive cams 24 are attached corresponding to the slide cams 22, respectively.

These drive cams 24 are each formed with an inclined surface 26 that contacts an inclined surface 25 formed on the slide cam 22 in order to convert the vertical movement of each into horizontal movement of the slide cam 22. There is. In addition, the slide cam 22 and the drive cam 24 include a drive cam 2.
Vertical dwelling surfaces 27 and 28 are formed, respectively, which keep the slide cam 22 in a stopped state even if the slide cam 4 moves up and down.

Further, a pad 29 for holding the blank W between the upper die 4 and the straightening die 20 is attached to the upper die 4 so as to be vertically movable. An elastic body 30 is installed between the pad 29 and the upper mold 4 to apply a resilient force to the blank W.

Bead forming portions 31 are formed in the straightening die 20 at positions corresponding to both sides of the blank sheet W, and the bead forming portions 3
A straightening punch 32 is attached to the upper mold 4 and forms a bead portion B which becomes a permanently deformed portion on the side of the blank plate in cooperation with the straightening punch 32.

Next, a process of correcting the meandering of the blank sheet W using the above-mentioned correction device Q will be explained.

First, while the upper mold 4 is separated from the lower mold 2 by a predetermined distance and each slide cam 22 is separated from the straightening die 20, the strip-shaped blank W@ is unwound from an uncoiler (not shown). It is introduced onto the straightening die 20. This state is shown in FIG. 2(A), and as shown in the figure, it is assumed that the blank W is meandering by an amount C from the reference position. When the upper die 4 is lowered toward the lower die 2 under this condition, the inclined surface 26 of the drive cam 24 comes into contact with the inclined surface 25 of the slide cam 22, and the downward movement of the drive cam 24 is caused by the horizontal movement of the slide cam 22. As a result of the movement, the slide cam 24 moves forward toward the correction die 20. As a result, as shown in FIG. 2(B), the linear pressure surface 21 formed on the slide cam 22 as a pressure jig comes into contact with both side surfaces of the strip-shaped blank sheet W and presses against the blank sheet W. compressive force is applied in the width direction to form both sides of the blank sheet W into a straight line.

Subsequently, when the upper die 4 is lowered toward the lower die 2, the blank W is held between the pad 29 and the straightening die 20, and is also held between the straightening punch 32 and the straightening die 20, as shown in FIG. 2(C). In cooperation with the bead forming section 31, bead sections B are formed on both sides of the blank sheet W.

During this bead forming, the doweling surface 28 of the drive cam 24 and the doweling surface 27 of the slide cam 22 come into contact with each other, so the slide cam 22 is stopped.

As mentioned above, in the process of elastically deforming the side surface of the blank sheet W into a straight line, the portion of the side surface of the blank sheet W that was initially meandering and convex is compressed by compressive force and becomes a concave surface. The part that had become stretched will be stretched by the tensile force. Under this condition, the bead portion B is formed by the cooperation of the straightening punch 32 and the bead forming portion 31 of the straightening die 20, and this portion is permanently deformed, so that the blank W becomes straight.
The sides of the curve remain straight to achieve shape freezing.

The blank sheet W, whose meandering has been corrected in this manner and both side surfaces are straight, is transported to a press die P installed adjacent to this straightening device Q, and subjected to a predetermined press process such as hammering process. Do the following. In addition, in the straightening device Q according to an embodiment of the present invention shown in FIG. Since the lower die 2 is shared by the straightening device Q and the press die P, the meandering of the blank sheet W can be straightened and hammered at the same time by one downward movement of the upper die 4. However, the straightening may be performed by a straightening device installed separately from the press mold for punching, and in that case, the pressing jig is operated by a hydraulic cylinder or the like.

Further, although two slide cams 22 as pressure jigs are provided in the illustrated embodiment, one of the slide cams 22 is used as a fixed wall so that only one slide cam 22 is used to press the blank sheet W. You can also do it.

(Effects of the Invention) As described above, according to the present invention, a strip material is compressed in the width direction of the strip material using a pressure jig having a linear pressure surface of a predetermined length. By applying force, the side surface of the strip-shaped blank sheet was shaped into a straight line, and while the compressive force was applied, a bead portion was plastically worked on the side of the strip-shaped blank sheet, so that the blank sheet did not meander. Even if the meandering is corrected,
The blank plate can be easily carried into a press mold for press processing such as stamping, and the press work can be carried out smoothly. Also, without considering meandering,
Since it is possible to set the extra thickness of the blank, it is possible to mold the work close to the sides of the blank, and the product yield can be improved.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a plan view showing the lower mold of a straightening device embodying the method of straightening a strip-shaped raw plate of the present invention, and Figs.
The straightening process of the straightening device shown in the figure is shown.
3 is a plan view showing the lower die of the press for punching process, and 4 is IV-IV in FIG. 3.
A sectional view taken along the line, and FIG. 5 is a plan view showing a meandering state of the strip-shaped raw plate in the width direction. DESCRIPTION OF SYMBOLS 20... Straightening die, 21... Pressure surface, 22... Slide cam as a pressure jig, 32... Straightening punch, B... Bead part, P... Press mold, Q. ...Orthodontic device, W...Main board, Wa...Work. Patent applicant Nissan Motor Co., Ltd. Figure 2 (A) Hole 7 27 Figure 2

Claims (1)

[Claims] Using a pressure jig having a linear pressure surface of a predetermined length, compressive force is applied to the strip blank in the width direction of the strip blank to form the side surface of the strip blank into a straight line. . A method for straightening a strip-shaped blank plate, characterized in that a bead portion is plastically worked on a side portion of the strip-shaped blank plate while the compressive force is applied.