JPH01135409A - Trimming device for end part of band plate - Google Patents

Abstract

PURPOSE:To narrow a trimming width of a band plate without inclining the rotating shaft of a shearing rotary blade by forming one rotary blade, of a pair of disc-shaped shearing rotary blades, positioned on the side of a shearingly removed part of the band plate to be sheared into a radially irregular corrugated shape. CONSTITUTION:A projecting top of a corrugated shearing rotary blade 1 begins to sear a band plate 3 prior to a concave bottom of the blade 1, and makes progress in shearing to enlarge a crack toward the concave bottoms taking their positions before and behind the projecting top in its rotating direction. Since the shearing progresses with the remaining part of the band plate 3 connecting to its removed part on its both sides in a direction of the growth of the crack at a beginning spot of the sharing work, the jumping of both the above-mentioned parts can be controlled during the shearing to reduce a trimming width, and the shearing can therefore be ended in a line connecting the centers O1, O2 of rotary shafts. In addition, the projecting top of the blade 1 is made flat to disperse shearing force, and the removed part is thereby made continuous without its dividing into sections to make the crack progress with its successive enlargement. Thus the occurrence of a burr can be prevented.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a strip edge trimming device for shearing and removing the edges of a steel plate formed into a strip shape by rolling or the like.

[Prior art]

In the rolling and refining process of steel plates, side trimming is performed by continuously shearing and removing the edges of the steel plate using a pair of upper and lower rotating round blades, with the aim of removing defective edges and improving width accuracy. There is. Conventionally, in a trimming device generally used for this side trimming, as shown in FIG. 7, upper and lower rotating round blades 11. +2 axis of rotation 0. ,,o,. are parallel to each other, and with this configuration, when the trimming width becomes small, the compressive force in the width direction of the steel plate generated by the rotating round blade will cause the steel plate to escape from the cutter. To prevent this, it is generally necessary to set the trimming width to about twice the board thickness. For this reason, the yield of products decreases, and the steel industry is seeking the development of a technique to reduce the trimming width as much as possible in order to improve this yield. In addition, in the technical background as described above, as shown in FIG. 8, the rotation axis o, 1 of the upper rotating round blade 21 is tilted,
A trimming device has been developed that can narrow the trimming width by applying a tensile force toward the ends of the strip in the width direction.

[Problems to be solved by the invention]

By the way, when side trimming is performed using the trimming device configured as described above, the edge shape of the strip after trimming is obliquely curved, so that, for example, when rolling is performed thereafter, the strip at the inclined portion is Because it is thin, it remains unrolled, and due to the difference in elongation from other parts that have been rolled, longitudinal tensile force is generated at the ends of the strip, causing "edge cracks" and "edge cracks." It has become. Further, even if the product is made as is without a rolling process after trimming, it is not desirable for the edge portion to be slanted in terms of product quality. The present invention has been devised in view of the above-mentioned problems in order to effectively solve these problems. Therefore, the object is to provide a strip end trimming device that can narrow the trimming width without inclining the rotation axis of the rotary shearing blade.

[Means to solve the problem]

The strip end trimming device according to the present invention has the following configuration in order to solve the problems of the prior art and achieve the object. That is, in a strip end trimming device having a pair of upper and lower disc-shaped rotary shearing blades, one of the pair of disc-shaped rotary shearing blades is located on the side of the sheared part of the strip that is the object to be sheared. The blade is formed into a wavy blade shape that is uneven in the radial direction. Preferably, the wave-shaped convex top portion has a flat portion so as to come into surface contact with the sheared portion of the temporary end portion of the band.

[Effect]

According to the strip end trimming device according to the present invention, shearing is performed by holding the strip between the upper and lower rotary shearing blades, and as these two blades rotate, the strip enters between them. As the strip moves between the two blades, as shown in Figures 5 and 6, the convex top of the wavy blade begins to shear the strip at a temperature higher than the concave bottom before the concave bottom. However, the shearing progresses so that the crack at the sheared point gradually expands toward the concave bottom located on both sides of the convex top in the rotational direction. In the figure, 9 is a wave-shaped blade, 3 is a strip plate, and 10 is a crack location. Therefore, the locations where shearing starts are not continuous, but continue intermittently, and the shearing is performed with a time delay between these intermittently successive shearing initiation locations. in this way,
Since the shearing progresses with the remaining portion and the removed portion connected on both sides in the crack growth direction at the shearing start point, it is possible to suppress the remaining portion and the removed portion from jumping or escaping from the cutter during shearing. The trimming width (width of the removed portion) can be made smaller. In addition, if the wave blade is shearing at multiple points intermittently, the shear stress will also be dispersed to multiple points, and the compressive force in the width direction of the strip that causes the above-mentioned jumps and escapes will be dispersed, causing the phenomenon. suppress. Therefore, even if the rotational axes of both shearing rotary blades are parallel to each other without being inclined, it is possible to cut out the removed portion thinly. It is assumed that a light roll gap is set for both times so that shearing is completely completed on a line connecting the rotation axes of both blades. The shearing rotary blade has a certain thickness in the direction of its rotational axis in order to provide rigidity as a shearing blade. Therefore, if the convex apex of the wave blade is formed at a pointed angle, the apex extends linearly in the thickness direction (direction of the rotational axis), and the shearing part that is in line contact with the shear removal part in the width direction of the strip plate. This will form the blade. That is, the shearing blade in the thickness direction applies a shearing force so as to break up the sheared portions that are connected in the longitudinal direction. As mentioned above, the shearing of the strip in the longitudinal direction by the upper and lower blades ends on the line connecting the rotation axes of both blades, but the shearing removed portion by the shearing blades in the thickness direction ends in the longitudinal direction. If the shearing ends earlier than the shearing, when the final shearing occurs at the concave bottom of the wave blade,
The removed portion, which has already been divided, will be left hanging, and if shearing is performed in this state, the removed portion will jump and cause cracks. Conversely, if the convex apex comes into surface contact with the shear removed portion, the shearing force will be dispersed and reduced, and the shear removed portion will continue without being separated. In this case, the convex top generates a force that pushes down or pushes up the sheared part, and the crack at the sheared part gradually expands toward the concave bottom located on both sides of the rotational direction of the convex top. Help the shear progress as you go.

【Effect of the invention】

As is clear from the above description, the present invention provides the following excellent effects. Since the trimming width can be adjusted without tilting the rotation axis of the rotary shearing blade, steel strips with straight edges can be produced with high yield.

【Example】

A preferred embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
This will be explained with reference to the figures. FIG. 1 is a schematic diagram showing the schematic structure of an embodiment of the band plate end trimming device according to the present invention, viewed from the front side. FIG. 2 is a schematic diagram showing the schematic configuration of FIG. 1 viewed from the side. In the figure, 1 is an upper shearing rotary blade (hereinafter simply referred to as the upper blade), 2 is a lower shearing rotary blade (hereinafter simply referred to as the lower blade), and 3 is a belt-shaped steel plate as an object to be sheared. The upper blade 1 is located at the end (outside) in the width direction of the steel plate 3, and has an uneven wave edge formed around the upper blade 1. The lower blade 2 is located at the center (inner side) in the width direction of the steel plate 3, and its circumference is formed into a round blade. The diameter of the upper blade l and lower blade 2 is 30 mm each.
It is October. Further, each rotation axis 01 of the upper blade 1 and the lower blade 2. Ot are parallel to each other, and the steel plate 3 is also parallel to these rotational axes 0. ．． 0. inserted between them parallel to the FIG. 3 is an enlarged view of the main part showing the uneven shape of the wave blade in this embodiment. The height h of the convex portion 4 is 2u, the pitch p between the convex portions 4 is lo+u+, the convex top portion 5 has a flat portion 6, and both side portions 7 and 8 of the flat portion 6 are chamfered roundly. There is. The width dimension a of this flat portion 6 is lRR. Convex portion 4
The number of blades was 94, the material was 5KDII, and the manufacturing method was the same as that for ordinary rotary blades. A hot-rolled mild steel plate (thickness 2.9 x Side trimming was performed and the minimum trimming widths of both were compared. FIG. 4 is a graph showing the results, and the vertical axis indicates the minimum trimming width. In addition, the conventional technology is 11
This example is indicated by H. As is clear from this result, the minimum trimming width in the conventional technology was 6R11, whereas in this example, the minimum trimming width was 2R11.
It was possible to reduce the size to 1/3 of r1j+. It was also found that the minimum trimming width could be further narrowed by suppressing line vibration. Also, if the rotation axis 0 of the upper blade 1 is tilted,
It is possible to further narrow the trimming width.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the schematic structure of an embodiment of the band plate end trimming device according to the present invention, viewed from the front side. FIG. 2 is a schematic diagram showing the schematic configuration of FIG. 1 viewed from the side. FIG. 3 is an enlarged view of essential parts showing the uneven shape of the wave blade in an embodiment of the present invention, and FIG. 4 is a graph showing the results of an experiment comparing the minimum trimming width of the present invention and the prior art. ′? lr''5.6 Figures are diagrams explaining the present invention in detail, and Figure 5 is a side view;
FIG. 6 is a plan view showing a crack formed in the state shown in FIG. 5. FIG. 7 is a schematic diagram showing the general configuration of a conventional band plate end trimming device as seen from the front side. FIG. 8 is a schematic diagram illustrating the general configuration of another conventional strip end trimming device as viewed from the front side. l...Upper shearing rotary blade, 2...Lower shearing rotary blade, 3
...Rope plate as a strip plate which is a sheared body, 5. Convex top Patent applicant: Kobe Steel & Steel Co., Ltd. Representative patent attorney
Blue and White Blue (2 idiots) ￥41 Diagram
Figure 2 Figure 4 Figure 3 Figure 5 Figure 6 Figure 7 Figure 8

Claims (2)

[Claims] (1) In a band plate end trimming device having a pair of upper and lower disc-shaped rotary shearing blades (1, 2), of the pair of disc-shaped rotary shearing blades (1, 2), the one that is the object to be sheared; A strip end trimming device characterized in that one of the blades (1) located on the side of the shear removal portion of the strip (3) is formed into a wave blade shape that is uneven in the radial direction. (2) The wave-shaped convex top portion (5) is in surface contact with the shear removed portion of the strip end portion (6).
) The band plate end trimming device according to claim 1.