JPS60217012A - Method of cutting sheet metal - Google Patents

Abstract

PURPOSE:To cut off a wide sheet metal at a place between two geared rotary cutters in the case of cutting the wide sheet metal into numbers of sheets by a slitter, by forwarding the wide sheet metal into the place between the rotary cutters which are secured on both shafts. CONSTITUTION:In the case of cutting a sheet metal, the sheet metal 9 which is continuously fed from a coil 21 attached to a drum 20, runs first through a pair of grooving rollers 22a and 22b secured up and down, through which V shaped grooves are formed at slightly staggered places in the direction of width on the upper and lower surfaces of the sheet metal, and is subsequently forwarded to a pair of rotary cutters 7a and 7b secured up and down. As each of the cutting surfaces 18a and 18b of the rotary cutters faces each of the centers of the upper and lower V shaped grooves respectively, the sheet 9 is cut off along the line connecting the bottoms of both V shaped grooves to each other. The sheet metal 9 is taken up by a drum 23 after it has been cut off. Thus, this device allows the sheet metal to be cut off at the place between the rotary cutters which are geared each other.

Description

Detailed Description of the Invention (Technical Field) A method for cutting a metal plate according to the present invention includes a slitter or a slitter that continuously cuts a wide metal plate into a plurality of narrow metal plates using a pair of upper and lower rotating blades. It can be applied to shearing machines that cut metal plates with vertically moving straight blades to obtain narrow metal plates, and produces high-quality products without producing sharp beams on the cut edges. .

(Background of the Invention) For example, when cutting a wide metal plate with a slitter into multiple strip-shaped metal plates, a plurality of ring-shaped rotary blades are fixed to the outer peripheral surfaces of mounting shafts arranged parallel to each other. By feeding the metal plate between rotary blades fixed to both shafts, the metal plate is cut between the rotary blades that mesh with each other.

FIG. 1 shows an example of a slitter blade mounting shaft used for cutting such metal plates, and a large number of ring-shaped rotary blades fixed to the shaft. This slitter cuts a wide metal plate with a width W into 20 strip-shaped metal plates with a width W, and has first and second mounting shafts l disposed vertically and parallel to each other, 2 are constructed so that they can rotate at the same speed in opposite directions. A 2 flange 3 is formed at the right end of each of the mounting shafts 1 and 2 (up, down, left and right directions are according to the drawings; the same applies hereinafter), and a male thread 4 is formed at the left end.

In order to attach the annular rotary blades 7a and 7b to each of the holding shafts l and 2, a short cylindrical first spacer 5 having a length that almost matches the width W of the band-shaped metal plate after cutting, and A second spacer 6 whose length is shorter than the first spacer 5 by approximately the thickness of two rotary blades is used alternately, and the lower edge of the rotary blades 7a, 7a attached to the upper picking shaft 1 and the lower side The mounting shaft 2& is engaged with the upper edge of the attached rotary blades 7b, 7b. A nut 8 (t±) is screwed into the male thread 4 at the left end of each taking shaft 1.2 and tightened, and each spacer 5.6 and rotary blades 7a, 7
b is a state in which the main body 8 is strongly held between the flange 3 and the flange 3.

Therefore, when a metal plate having a width W is fed between the two shafts 1.2 while rotating the mounting shafts 1.2 in opposite directions, this metal plate is cut at the meshing portion of the rotary blades 7a and 7b. There are 20 strip-shaped metal plates with a width W.

The outer diameter of the mounting shaft 1.2 can be freely adjusted, and the rotary blades 7a, 7
b to the mounting shaft 1.2 without using spacer 5.6 or nut 8.
Although there is a case where the cutter is fixed to the cutter (Utility Application No. 59-18659), the cutting operation itself is the same.

In addition, when obtaining a band-shaped metal plate with the required width by cutting both side edges of a band-shaped metal plate having a width wider than the required width, as shown in Fig. A coil 10 wound with a banded metal plate 9 is fitted onto a drum 12 suspended on a support stand 11, and both side edges of the metal plate 9 are passed through a slitter 14.
The rotary blade 13.13 is used to cut it out. Cut waste material 1
7 is wound up on a drum 16 on a support stand 15 provided behind the slitter 14, and the metal plate adjusted to a predetermined width is sent to another processing machine or a winding drum.

By the way, when a strip-shaped metal plate is continuously cut in this way, the following inconvenience occurs.

That is, the cutting surfaces of a pair of upper and lower ring-shaped rotary blades provided for cutting a metal plate are not completely on the same plane. That is, as shown in FIG. 3, one rotary blade 7a (
13) and the cutting surface 18b of the other rotary blade 7b (13), there is a deviation of only the width. Although the width of this deviation is small, it is essential for smooth cutting work. However, because the cutting surfaces 18a and 18b of the rotary blades 7a and 7b are deviated in this way, a sharp burr 19 is generated at the edge of the cut metal plate 9, as shown in FIG.

When such burrs are generated, not only does the appearance of the cut edge deteriorate, but also causes injury such as a cut to the hand when the edge of the cut metal plate is held by hand. Furthermore, when a large number of strip metal plates are made using a slitter as shown in Figure 1,
The forming direction of the burrs formed on the cut edge of each metal plate is half upward and half downward. However,
When using a metal plate, the direction of the burrs must be kept constant in many cases, and the process of adjusting the direction of the metal plate with burrs formed in different directions is required, which becomes troublesome. or,
When painting a metal plate, the paint tends to be defective on sharp burrs.

(Objective of the Invention) An object of the present invention is to provide a method for cutting a metal plate, which can eliminate all of the above-mentioned disadvantages and can efficiently obtain a high-quality metal plate.

(Structure of the Invention) The method for cutting a metal plate of the present invention involves forming V-shaped grooves on the upper and lower surfaces of the metal plate by slightly shifting them in the width direction of the metal plate, and then using a pair of upper and lower blades to cut the metal plate. A vertical shearing force is applied to the center of this 7-shaped groove to cut the metal plate.

(Embodiments of the Invention) Next, the present invention will be explained in more detail by explaining the illustrated embodiments.

5 to 9 show a first embodiment of the invention applied to a slitter. As shown in FIG. 5, the metal plate 9 is continuously fed out from the coil 21 attached to the drum 20.
First, the upper and lower pair of grooves (the 7-shaped grooves pass between the rolls 22a and 22b and are formed at positions slightly shifted from each other in the width direction of the upper and lower surfaces, and then between the upper and lower pairs of rotary blades 7a and 7b. sent to.

The cutting surfaces 18a and 18b of both rotary blades are respectively - above v
Since the metal plate 9 faces the center of the groove, both the upper and lower parts 7
It is cut at the line connecting the bottoms of the grooves. The cut metal plate 9a is wound around the drum 23.

In this process, the grooved rolls 22a and 22b which form seven-shaped grooves on both the upper and lower surfaces of the metal plate 9 are constructed as shown in FIGS. 6 and 7. That is, one or more (four in the illustrated example) grooved pieces 25a and 25b are externally fitted and fixed to shafts 24a and 24b which are disposed vertically and parallel to each other. Each grooved piece has a cylindrical outer circumferential surface of the pieces 25&, 25b, and each grooved piece has a shaft 24a of the roll 22a, 22b, 24b is determined. Furthermore, protrusions 26a and 26b, as shown in detail in FIG. 7, are formed along the entire circumference at the center of the outer peripheral surface of each of the grooved pieces 25a and 25b. Each of the protrusions 26a, 26b has a substantially triangular cross section, has a sharp end at the center, and has a gently curved base that is continuous with the outer circumferential surface. The grooved bottom L facing each other is piece 25.
The protrusions 26a and 26b formed on the outer peripheral surfaces of a and 25b are
It is slightly shifted in the width direction of the metal plate 9. The length of this deviation is determined by the cutting surface 18 of the rotary blades 7a and 7b that cut the metal plate.
Let a and 18b be equal to the length of the shifted sentence (Figure 3).

Since the upper and lower pair of grooves are formed by the rolls 22a and 22b as described above, when a metal plate 9 with a thickness of t is fed between both rolls 22a and 22b, there are grooves on both the upper and lower surfaces of the metal plate 9.
V-shaped grooves 27a and 27b have a depth equal to the height of the protrusions 26a and 26b.

The metal plates 90 are formed so as to be shifted from each other by a certain amount in the width direction. The cross-sectional shape of each of the seven-shaped grooves 27a and 27b has a sharply cut bottom and a gently curved opening edge.

The metal plate 9 having such V-shaped grooves 27a and 27b formed on both upper and lower surfaces is then fed into a slitter having a pair of upper and lower rotating blades 7a and 7b as shown in FIG. 8 and cut. . The structure of this slitter itself is similar to that of a conventional slitter as shown in FIG.
The positions of the rotary blades 7a and 7b are determined so as to face the centers of the grooves 27a and 27b.

The grooved metal plate 9 passes between rolls 22a and 22b, and has V-shaped grooves 27a and 27b formed on both upper and lower surfaces, respectively.
When the metal plate 9 is fed into a slitter having rotary blades 7a and 7b configured as described above, the metal plate 9 is cut into the state shown in detail in FIG.

That is, the cut is made from the sharply cut bottom of the 7-shaped groove formed on the upper and lower surfaces, but cracks occur from the cut when each blade 7a and 7b are cut, and the cracks from both sides extend to the thickness of the metal plate. When continuous at the middle part in the horizontal direction, a wide metal plate 9
is cut into narrow metal plates 9a, 9a. During this cutting, the rotating blades 7a and 7b apply force to the metal plate 9 from above and below in the shearing direction, causing cracks to occur from both the top and bottom surfaces of the metal plate 9 at the same time. Because they match, there is no burr on the cut edges. Also, even if cracks occur on one side first,
Since this crack runs toward the bottom of the V-groove on the other side, no burrs will form on the cut edge. That is, since the curved side edges of the 7-shaped grooves formed by the rolls 22a and 22b remain as they are on the cut edge, no sharp portions are formed on any part of the cut edge. The cut edge of the metal plate 9a is the first
As shown in detail in Figure 0, the curved portions 30 and 30 on both the upper and lower edges are grooved portions formed by the protrusions of the pieces, and the flat sheared surface 31 at the top is a portion cut by the cutting surface i8a of the rotary blade 7a. ,3
2 is a fracture surface caused by a crack.

In FIGS. 6 and 8, 28 and 29 are spacers for fixing the rotary blades 7a, 7b and the grooved pieces 25a, 25b at predetermined positions on each axis. Such spacers 28 and 29 will become unnecessary if each mounting shaft is constructed so that its diameter can be changed by the action of hydraulic pressure. In other words, if the inner circumferential surface of the rotary blade or groove fitted on the outside of the shaft is brought into strong contact with the outer circumferential surface of the enlarged shaft when the diameter of the shaft is reduced, these parts can be attached to the shaft without using a spacer. can be fixed at a predetermined location on the outer peripheral surface of the

Next, FIGS. 11 and 12 show a second embodiment of the present invention applied to a shearing machine. Metal plate 9 to be cut
is first strongly pressurized between an upper mold 33 having a protrusion 26a on the lower surface and a lower mold 34 having a protrusion 26b on the upper surface, and a V-shaped groove 27a is formed at a position slightly shifted from each other on the upper and lower surfaces. 2
7b is formed. The metal plate 9 having such V-shaped grooves 27a and 27b formed on the upper and lower surfaces, respectively, is then transferred to a shearing machine. Upper blade 35 of shearing machine
The cutting surfaces of the lower blade 36 and the lower blade 36 are V-shaped grooves 27a and 27, respectively.
Since the two blades 35 and 36 are opposed to the center of the metal plate 9, by bringing the double blades 35 and 36 close to each other, the metal plate 9 can be cut without producing burrs on the cutting edges, as in the case of a slitter.

(Effects of the Invention) Since the method of continuously cutting a metal plate of the present invention is configured and carried out as described above, sharp burrs are not generated on the edges of the cut metal, and the cut portion is free from sharp burrs. Not only is it beautiful and increases the product value, but there is no risk of injury if held by hand.

Furthermore, even when painting a metal plate after cutting, there will be no areas of paint failure due to sharp burrs.

Furthermore, both the upper and lower cutting edges are rounded, so
No matter which direction the cut metal plate is used in, the burrs do not get in the way, and there is no need to consider the direction in which the metal plate is sent out according to the direction of the burrs.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a slitter that continuously cuts a metal plate with a rotating blade, Fig. 2 is a schematic side view of a device for cutting both sides of a metal plate, and Fig. 3 is an engagement of the rotating blade. FIG. 4 is an enlarged sectional view of the edge of a metal plate cut by the conventional method; FIG. 5 is a schematic side view showing an apparatus for applying the method of the present invention to a slitter; FIG. 6 is an enlarged sectional view taken along line A-A in FIG. 5, and FIG. 7 is an enlarged view of section B in FIG. Fig. 8 is an enlarged cross-sectional view taken along the line CC in Fig. 5, Fig. 9 is an enlarged view of section D in Fig. 8, Fig. 10 is an enlarged sectional view showing the edge of the cut metal plate, and Fig. 11-12. The figures show the case where the present invention is implemented in a shearing machine, with FIG. 11 being a sectional view showing a state in which a V-shaped groove is formed, and FIG. 12 being a sectional view showing a state during cutting. 1.2: Mounting shaft, 3: Flange, 4: Male thread, 5: First spacer, 6: Second varnish spacer, 7a, 7b double rotating blade, 8
: Nut, 9.9a: Metal plate, 10: Coil, l work: Support stand, work 2 drum, 13: Rotary blade, 14 Nisritta,
15: Support stand, 16: Drum, 17: Waste material, 18a, 1
8b: Cut surface, 19: Burr, 20 Ni drum, 21: Coil, 22a, 22b: Grooved roll, 23 Ni drum, 2
4a, 24b: shaft, 25a, 25b: grooved piece, 26a
, 26b: Projection, 27a, 2'7b: V-shaped groove, 28.2
9 Ni spacer, 3o: curved part, 31: sheared surface, 32: split surface, 33: upper mold, 34: lower mold, 35: upper blade, 36: lower blade. Patent applicant: Kurashiki Kikai Co., Ltd. Representative: Kinzo Koyama (and one other person) Fig. f Fig. 2 4 Fig. 5 Fig. 4

Claims (1)

[Claims] A method for cutting a metal plate, in which V-shaped grooves are formed on the upper and lower surfaces of the metal plate with slight shifts, and then the metal plate is cut by applying blades that mutually apply a force in the shearing direction to the center of the V-shaped grooves.