JPH09174160A - Straightening device of deformed cross-section metal bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To straighten warp or twist on a thin wall part of a deformed cross- section metal bar. SOLUTION: Requlating screws 14c to 14f (and 15c to 15f) are screwed on a ceiling plate and a bottom plate of a body 12. Among these every two, one rollers is attached freely rotating. These rollers 16b to 16c (and 17b to 17c) are arranged so that at least four places of thin wall part of a deformed cross- section metal bar 11 are pressed from both faces, and these rollers are made non-touchable against a thick wall part. In such a composition, warp or twist on only thin wall part of the deformed cross-section metal bar 11 can be straightened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straightening device for deforming a metal strip having a modified cross section, and more particularly to a straightening device for straightening a warp or a twist of a lead frame with a heat sink having a thick portion and a thin portion. .

[0002]

2. Description of the Related Art FIG. 5 is a front view showing a conventional straightening device for a metal strip, and FIG. 6 is a side view of the straightening device shown in FIG.
The cylindrical main body 1 is fixed on a pedestal 2 having a concave surface, and the pedestal 2 is installed on a pedestal 3. In the vicinity of the bottom of the main body 1, a flat metal strip (here, a lead frame) 4 which is a workpiece can be inserted so that a lower die roller 5 can be inserted.
And the upper die roller 6 are arranged vertically in a substantially horizontal state.
The upper die roller 6 is supported by a semi-circular incliner 7.
This tilter 7 is rotatable in the body 1 in the circumferential direction,
The fixing can be performed by tightening the stopper 8. By rotating the inclining device 7, the inclination angle of the upper die roller 6 can be adjusted.

In order to straighten the metal strip 4 by the straightening device having the above-mentioned structure, the metal strip 4 is inserted between the lower die roller 5 and the upper die roller 6 and the upper die roller 6 is pressed down while the metal strip 4 is pressed. The strip material 4 is conveyed. When the metal strip 4 is warped or twisted, the stopper 8 is loosened, the tilter 7 is rotated in the circumferential direction according to the warp or twist of the metal strip 4, and the stopper 8 fixes it to the main body 1. By passing through this straightening device, the warp and twist in the width direction are straightened.

The metal strip 4 that has passed through the straightening device is further
The leveler device 10 configured as shown in FIG. 7 (side view) and FIG. 8 (front view) is passed through. The leveler 10 has a configuration in which a plurality of lower rolls 9a and a plurality of upper rolls 9b are arranged so as to be offset by a half pitch, and by continuously passing the metal strip 4 through it, residual strain of the metal strip 4 and Residual stress is removed. Then, the metal strip 4 is conveyed to the press die which is the next step.

[0005]

However, according to the conventional straightening device, the flat metal strip 4 having no unevenness can be straightened by the straightening device or leveler having the configuration shown in FIGS. 5 to 8. In the straightening device shown in FIGS. 5 and 6, the residual stress due to the residual strain can be removed by pressing the roller only in about half of the width direction of the metal strip 4.
Furthermore, the warp in the longitudinal direction can be corrected by the leveler,
If a complicated distortion that causes twisting remains in the metal strip 4, it cannot be removed (because the roller abuts in parallel to the traveling direction of the metal strip).

Further, in the case where the material to be processed is a deformed metal strip 11 such as a lead frame with a heat sink, as shown in FIG.
As shown in FIG. 10, it is possible to perform leveling by the roll of the leveler because the protruding portion 11 a of the metal strip 11 having an irregular cross section is used.
Only the (thick portion), the warp and twist of the protruding portion 11a can be corrected, but the thin portion cannot be corrected. Therefore, when the thin portion is warped or twisted, the set standard cannot be cleared.

Therefore, it is an object of the present invention to provide a straightening apparatus for a metal strip having a modified cross section, which is capable of correcting warpage or twisting in a thin portion of the metal strip having a modified cross section.

[0008]

In order to achieve the above-mentioned object, the present invention provides at least eight rollers for pressing at least four places of a thin portion of a metal sheet having a modified cross section from both sides, and the at least eight rollers. Among the individual rollers, at least the upper rollers are individually provided with an adjusting means for moving the rollers in the thickness direction of the deformed metal strip.

According to this structure, the upper and lower surfaces of the thin portion of the deformed section metal strip are pressed by the rollers at four places, the roller does not contact the thin portion, and only the thin portion is corrected. Therefore, it is possible to prevent the product from warping or twisting due to the internal residual strain, and to prevent the product (lead frame) from warping or twisting during press punching in the next step.

The adjusting means may be configured to include a pair of adjusting screws screwed into the main body in the shape of a rod and rotatably supporting both ends of the roller at its ends. According to this structure, the position of the roller can be changed only by changing the screwing amount of the pair of adjusting screws, and the pressing force and the pressurizing state with respect to the deformed cross-section metal strip can be changed. Therefore, it is possible to easily adjust the thin section of the deformed section metal strip according to the warp or twist condition.

Further, the adjusting screw and the roller attached to the adjusting screw are arranged so that they can be arbitrarily moved in the longitudinal direction of the metal strip having the irregular cross section. According to this configuration, the attachment position of the pressurizing point can be changed according to the product length of the deformed metal strip or the like only by changing the attachment position of the adjusting screw. Therefore, it is possible to freely deal with changes in product specifications.

Further, the rollers are arranged such that a number capable of functioning as a leveler is continuously arranged in the longitudinal direction of the metal strip having the irregular cross section. According to this configuration, the pressure applied by the roller can be continuously applied to the deformed section metal strip 11 in the traveling direction of the deformed section metal strip 11. Therefore, it can be used as a leveler for only the thin portion of the deformed section metal strip.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view showing an embodiment of a straightening apparatus for deformed section metal strips according to the present invention (however, a section for deformed section metal strips is a sectional view). 2 is a plan view and FIG. 3 is a side view. The rectangular tube-shaped main body 12 is installed on a pedestal 13, and a metal strip 11 having a modified cross section (here, a lead frame with a heat sink) is passed through the center of the main body 12. A plurality of adjusting screws 14a, 14b, 14c, 14d, 14e, 14 are provided on the upper surface of the main body 12.
f, 14g, and 14h are screwed in the vertical direction. These adjusting screws 14a to 14h are, as shown in FIG.
The installation location can be changed or added at each position on the E, F side and each position on the C, D, G, H side.
Then, the same number of adjusting screws 15a to 15h (only four adjusting screws 15c, 15d, 15e, and 15f are shown in FIG. 1) are vertically threaded on the lower surface of the main body 12 at positions facing the adjusting screws 14a to 14h. It is set up. A direction (FIGS. 1 and 2) orthogonal to the conveyance direction of the deformed section metal strip 11.
(8 in the left-right direction) between the lower ends of adjacent adjustment screws
Individual hard rubber rollers are rotatably provided.
As shown in FIG. 2, the roller 16a (adjustment screw 1
Between 4a and 14b), 16b (adjustment screws 14c and 14d)
16b (between the adjusting screws 14e and 14f), 16c
d (between the adjusting screws 14g and 14h) is provided, and rollers 17a to 17d (rollers 17b and 17 in FIG. 1) are provided on the lower surface.
2 are provided as shown in FIG.

Adjusting screws 14a-14h and adjusting screw 15
a to 15h are rollers 16 depending on the rotation direction and the rotation amount.
Each of a to 16d and 17a to 17d can be individually raised and lowered in the vertical direction. That is, the adjusting screw 1
By screwing 4a to 14h and 15a to 15h inward, the roller 16 for the metal strip 11 having the irregular cross section is formed.
The pressing force of a to 16d and 17a to 17d can be adjusted. Further, the rollers 16a to 16d and the roller 17a
1 to 17d are movable in the horizontal direction as shown in FIG. 1, and can press a desired position of the thin portion of the deformed metal strip member 11.

In the above configuration, for example, when it is desired to twist the deformed cross-section metal strip 11 clockwise in the traveling direction, the positions A and C in FIG. Position adjustment screws 14a, 14b, 14e, 1
4f is rotated in the pulling direction, and the roller 16a and the roller 1
Lift (raise) 6c. Further, the adjusting screws 14c, 14d, 14g, 14h at the B position and the D position are rotated in the inserting direction to lower the rollers 16b and 16d. By this operation, the metal sheet 11 having a modified cross section is twisted clockwise.

When it is desired to twist the deformed section metal strip 11 in the counterclockwise direction, the adjusting screw 14 at the A position and the C position is used.
Rotate a, 14b, 14e, 14f in the inserting direction,
Position and D position adjustment screws 14c, 14d, 14g, 14
It is sufficient to rotate h in the pulling direction. When it is desired to correct the deformed cross-section metal strip 11 having the bounce 13 as shown in FIG. 4, the rollers 16a to 16d and the rollers 17a to 17d at the respective points are arranged at diagonal positions. Further, the correction device having the configuration shown in FIGS. 1 to 3 can also be used as a leveler. In this case, the metal strip 11 having a modified cross section is used as shown in FIG.
By adding an adjusting screw and a roller between the A position and the B position, and between the C position and the D position, and continuously applying pressure,
It can be used as a leveler for only the thin portion 11c of the profiled metal strip 11.

As described above, according to the present invention, it is possible to prevent the product from being warped or twisted due to the residual strain inside the deformed section metal strip 11. As a result, a straightening force can be applied in the opposite direction in advance before processing by the press die, and the product is not warped or twisted during punching. The lead frame is usually bilaterally symmetrical with respect to the width direction. This is because the lead frame is separated into two rows from the center during punching and each becomes a product. Therefore, during press punching, when warping or twisting occurs in only one side of the two rows, both rows can be individually straightened, so that a straightening method suitable for the deformed section metal strip 11 can be selected.

Further, as shown in FIG. 2, since the mounting position of the adjusting screw can be changed in the longitudinal direction, the correction can be performed at an interval close to the full length dimension of the product, and the correction according to the actual warp or twist of the product can be performed. It can be carried out. Further, since pressure can be continuously applied to the deformed section metal strip 11 in the traveling direction of the deformed section metal strip 11, it can be used as a leveler for only the thin portion 11c of the deformed section metal strip 11. it can.

In the above description, the adjusting screws 14a ...
Although 14h and 15a to 15h are manually rotated, a motor or the like can be used as a drive source.

[0020]

As is apparent from the above, according to the present invention, it is possible to prevent the product from warping or twisting caused by the residual strain inside the deformed section metal strip, and the product can be manufactured at the time of press punching in the subsequent step. It does not cause warping or twisting.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a correction device according to the present invention.

2 is a plan view of the correction device of FIG. 1. FIG.

3 is a side view of the correction device of FIG. 1. FIG.

FIG. 4 is a cross-sectional view showing the shape of a deformed metal strip having a deformed cross section.

FIG. 5 is a front view showing a conventional straightening device for a metal strip.

6 is a side view of the correction device of FIG.

FIG. 7 is a side view showing a leveler device used after a straightening process by a conventional straightening device.

8 is a front view showing a roller pressing state by the leveler device of FIG. 7. FIG.

FIG. 9 is a side view showing a conventional leveler device for a metal strip having a modified cross section.

10 is a front view showing a roller pressing state by the leveler device of FIG. 9. FIG.

[Explanation of symbols]

 11 Deformed cross-section metal strip 12 Main body 14a-14h, 15a-15h Adjustment screw 16a-16d, 17a-17d Roller

Claims (4)

[Claims] 1. At least four thin-walled portions of a metal strip having a modified cross-section
At least eight rollers in total for pressing a portion from both sides, and an adjusting means for individually moving at least each upper roller of the at least eight rollers in the thickness direction of the deformed section metal strip are provided. A straightening device for irregularly shaped metal strips. 2. The irregular cross section according to claim 1, wherein said adjusting means includes a pair of adjusting screws threaded into the main body in a rod shape and rotatably supporting both ends of said roller at its ends. Straightening device for metal strips. 3. The modified cross-section metal strip according to claim 2, wherein the adjusting screw and the roller mounted on the adjusting screw can be arbitrarily moved in the longitudinal direction of the modified cross-section metal strip. Straightening device. 4. The straightening device for a deformed metal strip according to claim 1, wherein a number of the rollers capable of functioning as a leveler are continuously arranged in the longitudinal direction of the metal strip. .