JP2857287B2 - Apparatus and method for shearing and shearing metal strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for shearing a metal strip.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory view of conventional strip shearing of a metal strip 1. In FIGS. 6A and 6B, the metal strip 1 travels from above the paper surface toward the back surface. A pair of cylindrical rotary blades 3-1 and 3-2 attached to each of the upper and lower shafts 2-1 and 2-2 rotate with their blade edges overlapping with each other, and rotate the metal strip plate 1, Hoop 1-1,
Shearing and shearing into 1-2 and 1-3. However, in this method, as shown in FIG.
3 has a problem that burr 4 occurs. The hoop in which the burr 4 has occurred causes a problem that the burr damages the roll surface and a worker touches the burr when the metal strip passes through various rolls in a subsequent process, for example, a molding processing line, and causes cuts. For example, in the case of an electromagnetic steel sheet, the presence of burrs may cause deterioration of characteristics due to an electrical short circuit of the laminated iron core. For this reason, the hoop burrs are cut off by a grinder or burrs are crushed by a masher roll, but the burrs removal operation is troublesome.

FIG. 7 is an explanatory view of a known strip shearing for preventing burrs. In this case, two shear stands (B) and (C) are arranged in series on the pass line, and the shear stand (B) exceeds the height of the cutting edges of the cylindrical rotary blades 3-1 and 3-2. A shearing deformation that does not separate the metal strip without wrapping is applied, and in the subsequent shearing stand (C), the strip formed by the shearing stand (B) without overlapping the cylindrical rotary blades 3′-1 and 3′-2. Shearing stand on cutting line (B)
And reverse shear deformation in the opposite direction. Due to this reverse shearing deformation, cracks 5 communicating with the cutting line grow and are cut into hoops 1-1, 1-2 and 1-3. In the example of FIG. 7, since the hoops 1-1, 1-2, and 1-3 are separated by the communicating cracks 5, burrs can be prevented from occurring.

[0004] However, in the shearing of Fig. 7, since two shear stands arranged in series are used, there is a problem that the shear line becomes long and a problem that the speed control of the two shear stands becomes complicated. There is a point. Also shear stand
(B) and the shearing stand (C) are separate stands and are separated from each other.
If it is shifted in the direction, the cutting line by the shearing stand (B) and the cutting line by the shearing stand (C) are different from each other, so that there is a problem that the hoops 1-1, 1-2 and 1-3 are not separated. .

FIG. 8 is an explanatory view of another known shearing shearing for preventing burrs. In this case, a shear stand (B) and a pinch roll stand (C) using a flat roll are arranged in series on the pass line. In the shearing stand of FIG. 8B, the cylindrical rotary blades 3-1 and 3-2 are similar to FIG. 7B.
Without overlapping the height of the cutting edge, a shearing deformation that does not separate the metal strip is given, and flat rolling is performed by flat rolls 3 "-1 and 3" -2 on the subsequent pinch roll stand (C). During this flat rolling, the shear deformation portion provided by the shear stand (B) is subjected to shear deformation, and the hoop 1-
Communicative cracks are generated and separated between 1, 1-2 and 1-3.

However, in the method of FIG. 8, the appropriate height region of the cylindrical rotary blades 3-1 and 3-2 becomes narrower as the metal strip becomes thinner regardless of the material, and it is difficult to set the metal strip. A hoop in which burrs are separated immediately after the shearing stand in (B) or an unstable state such as not separating even when pressed by the pinch roll in FIG. Further, in the blade assembling work of the cylindrical rotary blades 3-1 and 3-2, in addition to setting the height of the blade, it is necessary to increase the blurring accuracy of the blade.
There is a problem that considerable work time and skill are required.

[0007]

SUMMARY OF THE INVENTION The present invention uses a single shearing stand, and does not always generate burrs stably regardless of the metal material even when the metal strip is thin. It is an object of the present invention to provide an apparatus and a method for shearing a metal strip which can be sheared.

[0008]

FIG. 1 is an explanatory view of an example of a shearing device according to the present invention, FIG. 1 (A) is an explanatory view of a side view, and FIG.
FIG. The present invention will be specifically described based on FIG. In the present invention, the upper shaft 2-1 and the lower shaft 2-2 are attached to each other, and are rotated in a direction indicated by an arrow 7 by rotating the shafts. Cylindrical rotary blade 3-1
And 3-2.

In the present invention, the cylindrical rotary blades 3-1 and 3
-2 is a pair of upper and lower ring-shaped rotary blades 8-1 and 8-2 that apply reverse shearing deformation in the opposite direction to the shearing deformation applied by the cylindrical rotary blade to the same cutting line where shearing deformation is applied. Have.

The combination of the cylindrical rotary blade and the ring rotary blade will be described with reference to an example of the cylindrical rotary blade 3-1 and the ring rotary blade 8-1. In the present invention, the cylindrical rotary blade 3-1 and the ring-shaped rotary blade 8-1 are such that the shaft 2-1 of the cylindrical rotary blade 3-1 is inside the inner surface of the ring of the ring-shaped rotary blade 8-1 (within the inner diameter). And the ring-shaped rotary blade 8-1 has a rotation center different from that of the shaft 2-1 and is combined so as to contact the metal strip 1 at a position close to the cylindrical rotary blade 3-1. A shearing deformation is applied to the strip line of the strip. Further, the ring-shaped rotary blade 8-1 is formed in a structure in which the outer periphery of the ring is pressed by the pressing rollers 9-1 and 9-1 'and rotates in the direction of arrow 11 to impart reverse shear deformation to the metal strip 1. ing. Although the example of the cylindrical rotary blade 3-1 and the ring-shaped rotary blade 8-1 has been described, the cylindrical rotary blade 3-2 and the ring-shaped rotary blade 8-2 are similarly combined and formed.

FIG. 2 is an explanatory view of a shearing method using the shearing device of the present invention. The metal strip 1 first contacts the cylindrical rotary blades 3-1 and 3-2, as shown in FIG. A shearing deformation is applied to the cutting line 10 so as not to separate the metal strip. This non-separable shear deformation is caused by the upper cylindrical rotary blade 3-1 and the lower cylindrical rotary blade 3
-2 can be obtained by setting the interval D-1 to a value smaller than the thickness T of the metal strip 1 without overlapping the heights. D-1 when shearing deformation without separation is obtained varies depending on the material of the metal strip, and for example, in the case of a mild steel strip, D-1 = 0.2T to 0.8T.
(T: thickness of the strip).

In FIG. 2A, the metal strip 1 to which the shear deformation has been applied is provided with the ring-shaped rotary blades 8-1, 8-
2 imparts the reverse shear deformation shown in FIG. At this time, the upper ring-shaped rotary blade 8-1 and the lower ring-shaped rotary blade 8-2
Not to overlap in height, the distance of its D-2
The reverse shear deformation gives cracks 5 to the strip lines 10 of the metal strip 1 and grows, and the metal strips become hoops 1-1, 1-2, and 1-3
To separate. D-2 from which the reverse shear deformation that separates is obtained,
Depends on the material of the metal strip and on the amount of shear deformation in the preceding process. For example, in the case of a mild steel sheet, D-2 = 0.1T
When it is set to 0.9 T (T: thickness of the strip), reverse shear deformation sufficient to separate the metal strip can be given. In the apparatus of the present invention, since the metal strip is all sheared by the rotary blade as compared with the known roll cutting method, the lap area can be set wider.

The present invention will be described repeatedly with reference to FIG.
The hatched portion of the metal strip 1 in the figure is a portion corresponding to the left hoop 1-1 in FIG. 2 (B), and the dotted line of the metal strip 1 in the figure is the central part of FIG. 2 (B). Is a portion corresponding to the hoop 1-2 of FIG. The upper cylindrical rotary blade 3-1 pushes down the hatched portion of the metal strip 1, but the lower cylindrical rotary blade 3-2 does not push down the dotted line portion of the metal strip 1. For this reason, a shearing deformation is applied to the boundary between the hatched portion and the dotted portion, which are the dividing lines. In this case, a shearing deformation is applied in a range where the hatched portion and the dotted line portion are not separated.

At the rear surface close to the cylindrical rotary blade, a metal strip 1
Abuts on the ring-shaped rotary blades 8-1 and 8-2. At this time, the lower ring-shaped rotary blade 8-2 pushes up the hatched portion of the metal strip 1, and the upper ring-shaped rotary blade 8-1 does not push up the dotted line portion of the metal strip 1. For this reason, a reverse shearing deformation in which the shearing direction is opposite to the shearing deformation applied by the cylindrical rotary blades 3-1 and 3-2 is applied to the boundary between the dotted line portion and the hatched portion. The section of the cutting line subjected to the shearing deformation is cracked by the reverse shearing deformation, grows, and separates into hoops 1-1 and 1-2 at the boundary between the hatched portion and the dotted line portion.

FIG. 3 is an explanatory view of an example of mounting a cylindrical rotary blade and a ring rotary blade according to the present invention. In the figure, 2 (2-1,
2-2) is a shaft, 3 (3-1, 3-2) is a cylindrical rotary blade, 8 (8-1, 8-2) is a ring rotary blade, and 9 (9-
1, 9-2) are pressing rollers and 12 (12-1, 12-2).
Is an example of a flange, and 13 is an example of a spacer.

The cylindrical rotary blades 3-1 and 3-2 have a shaft 2
-1 and 2-2 are fixed and attached respectively. The ring-shaped rotary blades 8-1 and 8-2 are provided with a shaft 2 on the inner surface of the ring.
1 and 2-2, and the cylindrical rotary blade 3-1 and the flange 1
2-1 or 3-2 and 12-2. A pressing roller 9-1 is provided on the outer periphery of the ring-shaped rotary blade.
9-2 are arranged. When the shafts 2-1 and 2-2 are rotated, the cylindrical rotary blades 3-1 and 3-2 are rotated by the rotation of the shafts.

The ring-shaped rotary blades 8-1 and 8-2 rub the side surface of the cylindrical rotary blade 3-1 and the side surface of the flange 12-1, or the side surface 3-2 and the side surface 12-2. The shafts 2-1 and 2-2 rotate eccentrically. Flange 12-
Reference numerals 1 and 12-2 set the ring-shaped rotary blades 8-1 and 8-2 at positions where they are not pinched with an excessively strong force so that the ring-shaped rotary blades 8-1 and 8-2 can rotate freely and eccentrically. When the ring-shaped rotary blades 8-1 and 8-2 rotate, the pressing roller 9-1 is turned on.
And 9-2 are fixedly arranged at a predetermined interval L, and
1 and 8-2 are supported so as to rotate at a fixed position.

In the present invention, a cut is formed in the cutting line on one surface of the metal strip by applying a shearing deformation by the cylindrical rotary blade, and a reverse shearing deformation is applied by applying the reverse shearing deformation by the ring-shaped rotary blade. A cut is formed in the cut line on the other surface, and the cut is communicated from one surface of the metal strip to the other surface to grow into a crack, thereby cutting the metal strip. Therefore, the generation of the burrs 4 described with reference to FIG. 6 is prevented without tearing the metal strip at the cutting line at the time of shearing.

In the present invention, only one shear stand is used. For this reason, compared with the method of FIG. 7 using two shear stands, the shear line is short and the operation is easy. Further, according to the present invention, since the position of the cylindrical rotary blade for applying the shearing deformation and the position of the ring-shaped rotary blade for applying the reverse shearing deformation are close to each other, the metal band plate has an arrow 6 in FIG. Therefore, the shearing and reverse shearing deformations are accurately applied to the same cutting line, and the metal strip can be cut smoothly.

FIG. 4 is a general explanatory view of the apparatus of the present invention.
FIG. 2 is an explanatory view of the entire apparatus, FIG . 2B is an explanatory view of a shearing method, and FIG . In the shearing device of FIG.
Each pressing roller 9 (9-1, 9-1 ', 9-2, 9-2')
Are mounted on a single pressing frame 14 and not only can the distance between the respective pressing rollers be adjusted, but also the pressing frame 14 can be moved in or out of the running direction of the metal strip, indicated by the arrow 15. By moving in the opposite direction, the set position can be adjusted and set to a desired position.

When the shearing device shown in FIG. 5 is used, the pressing frame 14 is moved and adjusted in the direction of the arrow 15 to set the center of rotation of the cylindrical rotary blade 3 (3-1, 3-2) and the ring shape. Spacing S between rotating blade 8 (8-1, 8-2) and center of rotation
Can be set as desired. For this reason, the interval S between the cylindrical rotary blade 3 and the ring-shaped rotary blade 8 can be set to an optimal interval according to, for example, the thickness of the metal strip.
The metal strip can be sheared more smoothly.

According to the present invention, a grain-oriented electrical steel sheet (30ZH1
05: Product of Nippon Steel Corporation)
The characteristics were compared with those of the conventional slit method, and the results shown in Table 1 were obtained.

The electromagnetic characteristics were determined by taking a sample of 100 mm width including slit edges on both sides from the vicinity in the length direction of the mother coil, and using a single-sheet magnetometer (Single Sheet Tester: S)
ST). The reason for exhibiting good magnetic characteristics is estimated as follows. In the conventional slit method, the lowering of the strip by the upper rotary blade and the raising of the strip by the lower rotary blade progress simultaneously, and in addition to the slit distortion given to both slit edges of the strip, the slit A bending stress is applied. On the other hand, it is considered that the slit method according to the present invention has less slit distortion and bending distortion.

The coated steel sheet and the hot-dip galvanized steel sheet to which the slit method according to the present invention was applied exhibited less rust on the slit edge cross section than the conventional slit method. Because these steel sheets have a large amount of surface paint or zinc per unit area, burrs are less likely to occur in the conventional method than in other steel sheets, but surface coating due to slits from the upper and lower surfaces was caught in the slit edge cross section It is considered that the effect and the fracture surface ratio of the slit edge section are small. As described above, the slit method according to the present invention that does not generate burrs can provide excellent characteristics in terms of quality.

[0025]

[Table 1]

[0026]

According to the present invention, it is possible to cut a metal strip by using only one shearing stand without generating burrs.

[Brief description of the drawings]

1 is an explanatory diagram of an example of a shearing device of the present invention, FIG. 2 is an explanatory diagram of an example of a shearing method of the present invention, FIG. 3 is an explanatory diagram of attachment of a cylindrical rotary blade and a ring-shaped rotary blade of the present invention, 4 is an explanatory diagram of an example of the shearing device of the present invention , FIG. 5 is an explanatory diagram of an example of the shearing device of the present invention , FIG. 6 is an explanatory diagram of conventional strip shearing of a metal strip, and FIG. FIG. 8 is an explanatory view of another known shearing for preventing burrs. FIG. 8 is an explanatory view of another known shearing for preventing burrs.

[Explanation of symbols]

1: Metal strip, 1-1, 1-2, 1-3: Hoop,
2 (2-1, 2-2): shaft, 3 (3-1, 3-
2): cylindrical rotary blade, 4: burring, 5: crack,
8 (8-1, 8-2): ring-shaped rotary blade, 9 (9-1, 8-1)
9-2, 9-1 ', 9-2'): pressing roller, 10: sectioning line, 12 (12-1, 12-2): flange, 1
3: Spacer, 14: Press frame , 15: Movement adjustment direction of the press frame.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23D 19/06 B23D 33/08

Claims (2)

(57) [Claims] 1. A pair of upper and lower cylindrical rotary blades attached to each of the upper and lower shafts to impart shear deformation to a cutting line of a metal strip, and a cylindrical rotary blade on the same cutting line has a shearing direction. Has a pair of upper and lower ring-shaped rotary blades that impart reverse shear deformation in opposite directions, and the cylindrical rotary blade and the ring-shaped rotary blade have a shaft of the cylindrical rotary blade on the inner surface of the ring of the ring-shaped rotary blade. The ring-shaped rotary blade has a rotation center different from that of the shaft, and is combined so as to abut on the metal strip at a position close to the cylindrical rotary blade. Metal pressed by rollers
At the desired position in the running direction of the strip or in the opposite direction to the running direction
A metal strip strip shearing device characterized in that it can be moved to a desired position and set . 2. Using a strip cutting shear device for a metallic strip of the mounting serial to claim 1, the cylindrical rotary blade imparts shear deformation metal strip to strip cutting line of the metal strip is not separated, subsequent A method of cutting and shearing a metal strip, wherein the ring-shaped rotary blade imparts reverse shearing deformation to separate the metal strip at the same cutting line.