JPH0319717A - Method and device for stack cutting of strip steel - Google Patents

Abstract

PURPOSE:To cut a thin strip steel and also a soft strip steel with a high efficiency without any burr on the cutting face by cutting a strip steel with its stacking at least two sheets, and arranging a thin steel strip or soft steel strip at the round edge side coming into contact with a steel strip chip and a thick steel strip or hard steel strip at the round edge side coming into contact with a product at the side trimming time by a pair of the upper and lower rotary round edges. CONSTITUTION:An upper side rotary round edge 1a is brought into contact with a steel strip chip 2c and a lower side rotary round edge 1b is brought into contact with a steel strip product 2d and cutting is executed, when two stacking steel strips are subjected to side trimming by a pair of the upper and lower rotary round edges, so a thin steel strip 2a is stacked on a thick steel strip 2b. When the steel strip-stacked like this are subjected to trimming, a pretty cutting face having no burr, etc., is formed because of the thin steel strip 2a being supported on the lower side thin steel strip 2b of large stiffness and the lower side thick steel strip 2b can obtain the cutting face of a conventional type. Trimming can be executed with high efficiency by increasing the stiffness of the whole body with the stacking at least two sheets of thin and thick steel strips, soft and hard steel strips or thin and hard steel strips and by abutting the rotary round edge on the thin or soft strip steel at the steel strip chip side.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a method and apparatus for overlapping cutting of steel strips, and more specifically, to slitting and side trigging steel strips with high efficiency, and producing steel strips with good cut surfaces. The present invention relates to a method and apparatus for repeatedly cutting steel strips.

(Prior Art) A steel strip manufactured by hot rolling or cold rolling is cut into a plurality of strips using slits or finished to a predetermined width by side trimming. When slitting a single steel strip into multiple pieces, the steel strip is usually fed between a pair of upper and lower rotating round blades and sheared.

When side trimming a steel strip, in addition to shearing with a rotating round blade, a rotating cutting tool is pressed against the side of the W4 strip to cut it. FIG. 5 is a schematic side view of a conventional slitting or side trimming device equipped with a rotary round blade. In the figure, 1 is a pair of upper and lower rotating round blades, 2
is a steel strip, 4 is a payoff reel, and 5 is a recoil reel. In order to slit a steel strip using such an apparatus, a plurality of rotary round blades 1 are arranged in the width direction of the steel strip 2, and the steel strip 2 supplied from a payoff reel 4 is fed thereto and sheared. The steel strip cut into a plurality of strips is wound onto a recoiling reel 5. When performing side trimming of a steel strip, rotary round blades 1 are placed on both sides of the steel strip and sheared by operating in the same manner as when slitting. On the other hand, when performing side trimming by cutting, as shown in FIG. 6, a rotating tool 3 is provided on the side surface of the steel strip 2 and the side surface is cut.

By the way, if the strap is thick and has appropriate rigidity, slitting and trimming can be done efficiently and the shape of the cut surface will be good. However, when the toning belt is thin or soft, the following problems arise.

a. If the steel strip is thin, its length will be long, and processing will take a long time, resulting in a significant drop in efficiency. Moreover, because of its low rigidity, buckling may occur, making machining difficult.

b. In the case of trimming with a rotating round blade, if the trimming allowance is small, shearing defects will occur. This tendency is strong when the plate thickness is 1.51 or less. For this reason, in the case of a thin steel strip, a trimming allowance of at least three times the plate thickness is required, resulting in a significant decrease in yield.

C. With a rotating round blade, burrs are generated on the cut surface because the belt is cut by shearing force. This ``burr'' becomes larger when the rope is softer. Such belts can cause scratches on the conveyor rollers, and when used in press processing, the burrs can fold in, causing product defects.

d. In the case of side trimming by cutting, unlike the case of shearing, "burrs" do not occur on the cut end surface, but buckling does occur.

(Problem to be Solved by the Invention) The purpose of the present invention is to provide a steel strip with appropriate rigidity when slitting or side trimming a steel strip.
To provide a method and device for cutting multiple layers of rope, which can efficiently process even thin steel strips and soft steel strips, and can produce clean cut surfaces without ``burrs.''

(Means for Solving the Problems) The present inventor has repeatedly studied various methods and devices that can process steel strips such as slits and side trimming with high efficiency and produce clean cut surfaces. As a result, we found that the above problem could be easily solved by overlapping steel strips and properly stacking them.
completed this invention. That is, the first invention is a method for stacking and cutting steel strips, which is characterized by stacking at least two steel strips and simultaneously subjecting the stacked strips to slitting or side trimming. In the method for overlapping cutting of strips according to the invention, when side trigging is performed using a pair of upper and lower rotating round blades, f! A third invention is a method for overlapping cutting of a steel strip or a soft steel strip, characterized in that a thick steel strip or a hard steel strip is arranged on the round blade side that contacts the product. A method for overlap cutting a steel strip, characterized in that a rotating bit or a rotary grindstone is used when performing side trimming of a steel strip by an overlap cutting method.A fourth invention implements the methods of the first to third inventions above. It is a device that has two parts in front of a rotating round blade, a rotating cutting tool, or a rotating grindstone for slinting or side trigging steel strips.
This is a steel strip overlapping cutting device characterized by having more than one payoff reel, and behind which the same number of recoil ring reels as the payoff reels are arranged.

(Function) Hereinafter, the steel strip overlap cutting method and apparatus of the present invention will be explained with reference to the drawings. Figure 1 (Enlarged cross-sectional view of one side of the steel strip in the width direction)
This is a diagram showing a state in which a two-ply rope is side-trimmed by a pair of upper and lower rotating round blades. In the figure,
1a is an upper rotating round blade that comes into contact with the steel strip scrap 2c, lb is a lower rotating round blade that comes into contact with the steel strip product, 2a is a thin steel strip, and 2b is a thick steel strip. In this figure, the upper rotary round blade 1a contacts the steel strip scrap 2c and the lower rotary round blade 1b contacts the rope product 2d for cutting, so the thin steel strip 2a is stacked on top of the thick steel strip 2b. There is. When the trimming strips stacked in this way are trimmed by shearing, the FI steel strip 2a is supported by the lower thick steel strip 2b, which has greater rigidity, as shown in the figure, so a clean cut surface with no burrs is formed. be intimidated. The lower thick steel strip 2b has the same cut surface shape as the conventional case.

Although not shown in the figure, when the lower round blade 1b is in contact with the steel strip scrap 2c and the upper round blade 1a is in contact with the product steel strip 2d, contrary to this figure, when sogging is performed, the thin steel strip is placed on the lower side. 2a and then lay the thick steel strip 2b on top of it. In this way, two or more sheets of thin steel strips and thick steel strips, soft steel strips and hard steel strips, or thin steel strips and hard steel strips are stacked together to increase the overall rigidity. By placing the rotary round blade that produces steel strip scraps in contact with a soft steel strip, even thin or soft steel strips can be trigged with high efficiency, and even cut surfaces can be created. .

FIG. 2 (an enlarged cross-sectional view of the steel strip in the width direction) shows a state in which a thin steel strip 2a and a thick steel strip 2b are overlapped and a rotary tool 3 is pressed against the end face of the thin steel strip 2a to perform side trimming. As in this example, when using a rotating tool or a rotary grindstone to grind the steel strip, there is no need to pay special attention to how the steel strips are stacked, since burrs and sag do not occur in the first place.

Next, the apparatus of the present invention will be explained. FIG. 3 is a diagram (schematic side view) showing an example of the device of the present invention. In this device, two payoff reels 4a and 4b are installed in front of a pair of upper and lower rotating round blades 1 (set so that the upper round blade is in contact with the steel strip scrap and the lower round blade is in contact with the product). The same number of recoil reels 5a and 5b are arranged at the rear. When using such a device to shorten the slit or side trim of stacked steel strips, use the payoff reel 4.
When the thin steel strip 2a is fed out from the payoff reel 4b and the thick steel strip 2b is fed out from the payoff reel 4b, a two-layered steel strip consisting of a thick steel strip on the lower side and a thin steel strip on the upper side is formed. This steel strip is slit or side trimmed by a rotating round blade 1. Then, for the reason explained using FIG. 1, two types of steel strips with clean cut surfaces can be obtained. Each steel strip is then wound onto recoil reels 5a and 5b. Although only one rotary round blade 1 is visible in Figure 3, in the case of strip cutting, the number of blades corresponding to the number of pieces to be cut is installed, and in the case of side trimming, two blades are placed on both sides of the rope belt.

FIG. 4 is an example of a device that performs side triangulation using a rotating cutting tool. In this case, two payoff reels (4a, 4b) are installed in front of the rotating cutting tool 3, and two recoil reels (5a, 5b) are installed behind it. To carry out side trimming with this device, the rotary cutting tool 3 is pressed against the side surface of two stacked steel strips (2a, 2b) for cutting. In the case of this device, there is no need to consider the stacking order depending on the thickness of the steel strip, so trimming is easier than with the above-mentioned rotating round blade. In the above description of the method and apparatus, the number of stacked steel strips is two, but there is no limit to the number as long as cutting efficiency and capacity are maintained.

Hereinafter, the method and apparatus of the present invention will be explained in more detail with reference to Examples.

(Example 1) In this example, side trimming is performed using a rotating round blade.

Ultra-low carbon steel strip with a thickness of 11 and a width of 1,010±2 mm (in weight %, C: O.OO02%, Si: 0.02%, Mn
:0.18%, P:o. o1s%, S: 0.005
%) and a plain carbon steel strip with a thickness of 3+nm and a width of 1,010±21 (in weight %, C: 0.04%, St: 0.010
%, Mn: 0.16%, P: 0.016%, S: 0
．． 007%), side trimming is performed using a device with rotating round blades as shown in Figure 3 (the round blades are arranged as in Figure 1), and each tuning band is Product width, minimum trim allowance on one side of the steel strip, degree of burr,
and the required time. The trimming operation is performed by feeding out each payoff reel (see Figure 3) so that the steel strip with a thickness of II is on the upper side and the toning strip with a thickness of 3+v is on the lower side. After trimming it, it was wound onto a recoiling reel. In addition, in order to clarify the effects of the present invention, the same investigation as above was carried out by separately side-trimming a steel strip with a thickness of IIlffl and a steel strip with a thickness of 31Ilm as in the conventional method.

9 l0 The results are shown in Table 1. As is clear from this table,
In the case of the present invention, even when the minimum trimming distance on one side was 2I, trimming could be performed without any problem. And even in that case, the thickness is 1
The thinner steel strip (mm) did not have any "burrs" at all. The 3mm thick steel strip has some small burrs, which are the same as before, but they are not large enough to adversely affect product quality. On the other hand, when trimming one sheet at a time using the conventional method, the minimum trimming allowance for both 1 mm and 3 mm thick steel strips is limited to 4 mm. "There has occurred. It goes without saying that the side trimming efficiency of the present invention is twice that of the conventional case where side trimming is performed separately.

1■ (Example 2) In this example, side trimming was performed using a rotating bit.

Ultra-low carbon steel strips having the same size and chemical composition as those used in Example 1 were stacked and side-trimmed with a device equipped with a rotating tool as shown in Fig. 4 to a width of 1.
A steel strip of 0.008 mm was used, and the state of buckling at that time was investigated. In the trimming operation, the steel strip was fed out from two payoff reels (see FIG. 4), trimmed using rotating bits installed on both sides, and then wound onto a recoiling reel.

In addition, in order to clarify the effects of the present invention, the same steel strips as above were separately side-trimmed by a conventional method, and the occurrence of buckling was investigated.

As a result, in the case of the present invention, since the rigidity was increased by stacking two layers, trimming could be performed without causing buckling. On the other hand, in the case of the conventional method, buckling occurred in all cases, making cutting impossible.

(Effects of the Invention) 12 As explained above, according to the method and device for overlapping cutting of strips of the present invention, not only steel strips having ordinary rigidity but also steel strips having ordinary rigidity can be cut.
Even thin strips and soft steel strips can be slit or side-trimmed with high efficiency. Moreover, the cut surface is “
A clean surface with no burrs is formed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a state in which the method of the present invention is implemented using a rotating round blade, FIG. 2 is a diagram showing a state in which the method of the present invention is implemented using a rotating cutting tool, and FIG. , a schematic side view of the belt lap cutting device of the present invention equipped with a rotating round blade, FIG. 4 is a schematic side view of the steel strip lap cutting device of the present invention equipped with a rotating cutting tool, and FIG. FIG. 6 is a schematic side view of a conventional cutting device with a blade. FIG. 6 is a schematic side view of a conventional cutting device with a rotating cutting tool. 1 is a rotating round blade, 1a is an upper rotating round blade, 1b is a lower rotating round blade, 2 is a steel strip, 2a is a thin steel strip, 2b is a thick steel strip, 3 is a rotating bite, 4a and 4b are payoff reels, 5a and 5b
is a recoiling reel.

Claims (1)

[Scope of Claims] (1) A method for overlapping steel strip cutting, which comprises stacking at least two steel strips and slitting or side-trimming the stacked steel strips at the same time. (2) In the method for overlapping cutting of steel strips according to claim 1, when side trimming is performed using a pair of upper and lower rotating round blades, a thin steel strip or A method for cutting a soft steel strip in layers, characterized by arranging a thick steel strip or a hard steel strip on the round blade side that contacts the product. (3) A method for cutting a steel strip in laps, characterized in that a rotating bit or a rotary grindstone is used when performing side trimming of a steel strip by the method for cutting laps in a steel strip according to claim 1. (4) An apparatus for carrying out the method for overlapping cutting of steel strips according to any one of claims 1 to 3, comprising:
A steel strip overlapping cutting device characterized in that a plurality of payoff reels and an equal number of recoil reels are arranged at the front and rear of the device for slitting or side trimming steel strips.