JPS6244305A - Cutting method for band board endface - Google Patents

Abstract

PURPOSE:To improve the machining accuracy and the service life of cutter, in band board processing facility such as steel board rolling line, by employing a cutter where the edge is arranged conically on the cutter shaft while twisting by specific angle thereby cutting the endface of band board obliquely. CONSTITUTION:Main shaft 7 to be driven by a motor 8 through drive unit 6 arranged on a slider 5 located on a bed 4 crossing perpendicularly with the travel line of band board 1 is inclining in advancing direction in vertical plane which is parallel in advancing direction of band board, where the angle theta2 to be formed between the cutter shaft 9 fixed to main shaft 7 and the surface of band board 1 is determined such that the angle theta3 between the cutter 11 and the surface of band board 1 will be 55-125 deg.C, for example. When cutting the vicinity of cutting portion of band board 1 while supporting through support rollers 12 from above and below, the endface is cut with the inclination angle (r) but since rnot equal to theta1 (conical angle of cutter 9)/2 and cut in advancing direction of band board 1, the machining accuracy is improved without causing flexure and to improve the service life of cutter. While the seam will match when forming into tubular thus to improve the welding performance.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a method for bevel cutting the end of a strip.

<Prior Art> Strip processing equipment such as a steel plate rolling line includes a step of cutting both ends of the strip in order to make the width of the strip constant. This cutting step is provided not only in a line for simply producing a strip as a product, but also in a pipe-making line for manufacturing a tube 1a from a strip 1, as shown in FIG.

In the above-mentioned cutting process, a side trimmer as shown in FIG. 6 is a conventionally known means for continuously cutting the ends of the strip. This is a pair of disc-shaped knives 2a.

2b is used to sandwich and shear the strip 1.

<Problems to be Solved by the Invention> However, with the side trimmer, the cutting edges of the knives 2a and 2b in the sheared portion are opened in the width direction of the strip plate 1 due to shearing force, so it is necessary to cut a cutting distance of at least several millimeters. It is necessary to keep it aside, and this causes a decrease in yield.

In addition, the cut surface of the end of the strip cut by the side trimmer must be perpendicular to the front and back surfaces of the strip. As shown in the figure, the seam 3 is a V-shaped point contact (tube 1a
When viewed in the longitudinal direction, this results in a line contact), which results in poor weldability when the seam 3 is electrically resistance welded.

Furthermore, as shown in FIG. 8, the end of the strip cut by the side trimmer is a shear fractured surface, and the surface condition is poor.
There is also deformation of the metal flow (indicated by the dotted line in the figure), which further impairs weldability, making it extremely difficult to manufacture particularly thick, high-quality pipes.

The present invention was made in view of the above-mentioned technical situation, and its purpose is to cut the ends of the strip obliquely, suitable for pipe making, etc., with a small cutting allowance, and also for metal flow. It is an object of the present invention to provide a method for cutting with minimal deformation.

Means for Solving the Problems〉 The structure of the present invention that achieves the above object is a method of continuously cutting the end portion of a moving strip obliquely, and the method includes twisting at a constant angle with respect to the cutter axis. A cutter having conical cutting blades arranged in a conical manner is driven with its cutter axis tilted toward the direction of movement of the band in a vertical plane parallel to the direction of movement of the band, thereby cutting the end of the band. It is characterized by what it did.

Effect> According to the above method, the strip plate 4 is cut by a cutter having a conical cutting edge, so that the cutting surface becomes an inclined surface. In addition, since the cutter shaft is tilted toward the direction of travel of the strip, the length of the cutting blade is effectively used to cut in the direction of travel, where the rigidity of the strip is most important. There is no bowl or metal flow deformation, and the machined surface accuracy can be improved.
The life of the cutting edge can be improved.

<Example> Fig. 1 shows a front view of the end portion of a strip plate being cut by a method according to an embodiment of the present invention, and Fig. 2 shows the view taken along the line A--A.

First, the apparatus used to implement the method will be described.

A ped 4 is provided below the running line of the strip plate 1 and perpendicular to the running line, and a slider 5 (only one side is shown in the figure) is symmetrically provided on the ped 4. The slider 5 is slid completely over the ped 4 by a drive mechanism (not shown). A driving force transmission device 6 is provided on the slider 5, and its main shaft 7 is inclined in the direction of movement of the strip 1 in a vertical plane parallel to the direction of movement of the strip plate 1.

In the figure, 8 is a drive motor provided on the slider 5, and the main shaft 7 is driven and rotated by this motor 8 via a transmission mechanism, a speed reduction mechanism, etc. in the drive force transmission device 6.

A cutter 9 is attached to the main shaft 7. The cutter 9 has a cutter axis (center axis of the cutter) on the outer peripheral surface of the cutter body 10.
The cutting blades 11 are arranged in a conical shape and are twisted at a certain angle. In the figure, θ is the conical angle formed by the cutting edge 11, and θ2 is the cutter shaft and strip plate 1 when the cutter 9 is attached to the main shaft 7.
The angle θ with the surface is the angle between the cutting blade 11 and the surface of the strip plate 1 in the same state, and this angle θ3 is, for example, 55° to
02 can be determined to be about 125°.

Cutting of the end portion of the strip plate 1 by the cutter 9 is performed by driving and rotating the pair of cutters 9 and passing the strip plate 1 between them. The vicinity of the cut portion of the band plate 1 is held between the front and back surfaces by support rollers 12.

Since the cutting edge 11 of the cutter 9 is arranged in a conical shape, the end surface 1b of the strip plate 1 is cut obliquely, as shown in FIG. In the figure, r is the cutting inclination angle. Incidentally, since the cutter 9 is inclined toward the traveling direction of the strip plate 1, the cutting inclination angle γ and (cutter cone angle/2) do not match. In addition, since cutting by the cutting blade 11 is carried out in the direction in which the strip plate passes through, which is highly rigid, the strip plate 1 is not bent, and metal flow deformation occurs in the strip plate 1 as shown in Figure W and 4. This will improve machining accuracy. Since the cutting edge 11 from the lower end to the upper end contributes to cutting, local wear of the cutting edge 11 does not occur, and the life of the tool is improved.

Since the end portion 1b of the strip plate 1 is cut diagonally, when it is formed into a tubular shape in the pipe-making process, the seams 3 are aligned as shown in FIG. 3, and weldability during electric resistance welding is improved. Furthermore, as described above, since no metal flow deformation occurs in the strip 1, the strength of the bath contact portion does not decrease below the strength of the strip 1, which is the base material.

If the width of the strip 1 changes, this can be handled by moving the slider 5 on the bed 4 and changing the position of the cutter 9.

Although the above embodiment applies the present invention to a pipe production line, the present invention can be applied to any case where the end portion of a strip plate is cut diagonally.

<Effects of the Invention> According to the method for cutting the edge of a strip according to the present invention, the edge of the strip can be cut diagonally with high precision without causing metal flow deformation.

Further, according to the method of the present invention, the yield of the strip plate can be reduced by reducing the cutting allowance.

Furthermore, the method of the present invention does not cause local wear of the cutter cutting edge;
The life of the cutting edge is improved.

[Brief explanation of drawings]

FIG. 1 is a front view showing how the edge of a strip plate is being cut by a method according to an embodiment of the present invention, FIG. 2 is a view taken along the line A-A,
FIG. 3 is an explanatory diagram showing an example of tube manufacturing of a strip with its ends cut by the method of the present invention, and FIG. 4 is an explanatory diagram of the metal flow of a strip with four sections cut by the method of the present invention. Figure i35 is a perspective view of the pipe making process, and the sixth factor is a schematic perspective view of a conventional side trimmer.
FIG. 7 is an explanatory diagram showing an example of pipe making using a strip plate whose ends are cut by a conventional side trimmer, and FIG. 8 is an explanatory diagram of metal flow of a strip plate whose ends are cut by a side trimmer. In the drawing, 1 is a strip plate, and 5 is a slider. 6 is a driving force transmission device, 7 is a main shaft, 9 is a cutter, and 11 is a cutting blade. Patent applicant Mitsubishi Heavy Industries, Ltd. Sub-agent Patent attorney Dobe (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 a

Claims (1)

[Claims] This is a method of continuously cutting diagonally the end of a moving strip, in which a cutter with cutting blades twisted at a fixed angle to the cutter axis is arranged in a conical shape, and the cutter axis is used to cut the edge of the strip at an angle. A method for cutting an end face of a strip, characterized in that the end of the strip is cut by driving the strip at an angle in a vertical plane parallel to the direction of travel.