JPH0312973B2 - - Google Patents

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.

(Prior art) Pressed products are formed by applying press processing such as shearing or drawing to a blank sheet. Usually, a strip-shaped blank sheet wrapped in a coil is sequentially rolled out, and a predetermined pressing process is carried out. It will be done.

3 and 4 are diagrams showing a press die P that is conventionally used for punching out a workpiece Wa of a predetermined shape from a strip-shaped blank W. By further performing drawing processing, edge bending processing, hole drilling processing, etc. on the workpiece Wa obtained by such a press die P for punching, a final product such as a panel material constituting an automobile body, etc., can be produced. can get.

The press mold shown in FIGS. 3 and 4 has a lower mold 2 fixed to a bolster 1, an upper mold 4 fixed to a press ram 3 which can move vertically above the lower mold 2, and a third mold. As shown in the figure, a die 6 is attached to the lower mold 2 and has a cutting edge 5 formed therein in a shape corresponding to the outer peripheral contour of a workpiece Wa to be blanked. A punch 8 is attached to the upper die 4 and has a cutting edge 7 formed thereon that punches out the strip-shaped blank W by cooperating with the cutting edge 5 of the die 6. Furthermore, during this punching operation, the punch 8 punches the blank W between the die 6 and the die 6. A pad 9 for clamping is attached to the upper mold 4 by bolts 10 so as to be vertically movable. In order to provide this clamping force, an elastic body 11 such as a coil spring is installed between the pad 9 and the upper die 4.

The coiled strip-shaped blank W is sequentially unwound from an uncoiler (not shown) and is carried onto the upper surface of the die 6 as indicated by arrows in FIG.
A guide roller 12 is rotatably attached to the bolster 1 with bolts 13 in order to position the strip-shaped blank W with respect to the die 6.
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 punching, and the left half shows the state after punching.

(Problems to be Solved by the Invention) The strip-shaped blank sheet W to be subjected to the above-mentioned press working such as punching is meandering in the width direction of the blank sheet W, as exaggeratedly shown in FIGS. 3 and 5. There may be cases.
When the blank W having meandered in this way is conveyed to the press die, in the conventional press die, the blank W is moved to a predetermined position with respect to the die 6 by the guide rollers 12. W was being positioned. For this reason, depending on the value of the meandering dimension, it may be difficult to smoothly transport the strip-shaped blank W into the press die. In addition, as in the conventional press die shown in FIGS. 3 and 4, the blank W is
When performing positioning, the side surface of the blank W may be deformed, and the meandering of the blank W may not be corrected.

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, then the workpiece that will become the product
The necessary dimension A of Wa must be set smaller than the value obtained by subtracting the meandering dimension C from the width dimension D of the blank sheet W, considering the case where the meandering is not corrected as described above. Therefore, the workpiece is started from the blank W.
The portion to be scrapped by punching Wa has to be set to a value including the meandering dimension C, resulting in poor yield.

For this reason, when using a conventional press die, if the strip-shaped blank meanders in the width direction, it is not only difficult to insert the blank W into the press die smoothly. However, there was a problem in that the dimensions of the excess material that would be scraped 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, Moreover, it is an object of the present invention to enable high-yield processing that can reduce scrap portions.

(Means for Solving the Problems) To achieve the above object, the present invention uses a pressing jig having a linear pressing surface of a predetermined length to apply pressure to a strip-shaped blank plate. A compressive force is applied in the width direction of the strip-shaped blank plate to form a side surface 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, the sides of the blank plate become straight in the width direction even if there are meandering parts in the blank plate. 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 and freezes the straight shape of the side. be done. As a result, even if there is a meandering band-shaped blank sheet, it is possible to perform press processing with the meandering reliably corrected, making it possible to smoothly carry the blank sheet into the press die and completely eliminating the meandering dimension. Processing with a high yield without consideration is achieved.

(Example) Hereinafter, an example of the present invention illustrated in the drawings will be described. 1 and 2 are diagrams showing a straightening device Q that embodies the method for straightening a strip blank sheet according to the present invention.
It is provided integrally with and adjacent to the press mold P shown in FIG.

In the lower mold 2 shown in FIGS. 3 and 4, a straightening die 20 that comes into contact with the back surface of the blank W and supports the blank W is attached to a portion adjacent to the press die P for punching. The straightening die 20 has a flat upper surface, and has a width that is equal to or slightly smaller than the width D 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 2 each having a predetermined length L and having a linear pressure surface 21 formed thereon.
2 is provided as a pressing jig so as to be movable towards and away from the correction die 20. The movement of the slide cam 22 is such that both end surfaces are guided by guides 23 and the lower surface is guided by a plate (not shown).

In order to drive the straightening die 20, two drive cams 24 are attached to the upper die 4, which is fixed to the press ram 3 which is vertically movable above the lower die 2, and correspond to the slide cams 22, respectively. There is.
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. Further, the slide cam 22 and the drive cam 24 are respectively formed with vertical dwelling surfaces 27 and 28 that keep the slide cam 22 in a stopped state even if the drive cam 24 moves up and down.

The upper mold 4 further has a blank W between it and the straightening die 20.
A pad 29 for holding the mold is attached to the upper mold 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 by working together with the bead forming portions 31, permanent deformation portions are formed on the sides of the blank sheet. A straightening punch 32 for forming the bead portion B is attached to the upper mold 4.

Next, using the straightening device Q as described above, the blank W is
The process of correcting meandering will be explained.

First, while the upper mold 4 is separated from the lower mold 2 by a predetermined distance and the respective slide cams 22 are separated from the straightening die 20, the strip-shaped blank W is unwound from an uncoiler (not shown). Straightening die 2
Enter above 0. This state is shown in Figure 2A.
At this time, as shown in the figure, the blank W
Suppose that the path is meandering by 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 drive cam 24 comes into contact with the inclined surface 25 of the slide cam 22.
The downward movement of is converted into horizontal movement of the slide cam 22, and the slide cam 24 advances toward the correction die 20. As a result, as shown in FIG. 2B, 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 the width of the pressurizing surface 21 relative to the blank sheet W is Apply compressive force in the direction,
Both sides of the raw plate W are formed into a straight line.

Subsequently, when the upper mold 4 is lowered toward the lower mold 2, the blank W is held between the pad 29 and the straightening die 20, and as shown in FIG. In collaboration with Department 31,
Bead portions B are formed on both sides of the blank sheet W. During this bead forming, since 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, the slide cam 2
2 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 curled part 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 way and both sides are straight, is conveyed to a press die P installed adjacent to this straightening device Q, and a predetermined press process such as punching process is performed. . In the straightening device Q according to the embodiment of the present invention shown in FIGS. 1 and 2, the straightening device Q is provided adjacent to the press die for punching, and the Since the mold 2 is shared by the straightening device Q and the press mold P, the meandering correction of the blank sheet W and the punching process are performed at the same time by one downward movement of the upper mold 4, but the punching process The straightening may be carried out using a straightening device installed separately from the press mold for use, and in that case, the pressing jig is operated by a hydraulic cylinder or the like.

Moreover, the slide cam 22 as a pressurizing jig is
Although two slide cams 22 are provided in the illustrated embodiment, it is also possible to use one slide cam 22 as a fixed wall and process the raw plate W using only one slide cam 22.

(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. The meandering can be reliably corrected even if the sheet is bent, and the blank sheet can be easily carried into a press die for press work such as punching, making it possible to perform press work smoothly. Further, since the extra thickness of the blank plate can be set without considering meandering, it becomes possible to mold the workpiece to close to the sides of the blank plate, and the product yield can be improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the lower mold of a straightening device embodying the method for straightening a strip-shaped raw plate of the present invention, and FIGS. 2A to C
1 shows the straightening process of the straightening device shown in FIG.
Figure 3 is a plan view showing the lower die of the punching press; Figure 4 is a cross-sectional view taken along the line - in Figure 3; Figure 5 is in the width direction of the strip-shaped raw plate. FIG. 3 is a plan view showing a meandering state. 20... Straightening die, 21... Machining surface, 22... Slide cam as a pressing jig, 32... Straightening punch, B
...Bead part, P...Press mold, Q...Orthodontic device, W...
Raw board, Wa...work.

Claims (1)

[Claims] 1 Using a pressure jig having a linear pressure surface of a predetermined length, compressive force is applied to the strip-shaped blank plate in the width direction of the strip-shaped blank plate to form the side surface of the strip-shaped blank plate into a linear shape. A method for straightening a band-shaped blank plate, characterized in that a bead portion is plastically worked on a side portion of the band-shaped blank plate while the compressive force is applied.