JPS60201815A - Shearing work - Google Patents

Abstract

PURPOSE:To reduce the dragged part of a work which is formed during work and improve the yield of material by cutting a work by a pair of upper and lower cutters along the cutting-in groove formed along the cutting line on the surface of the upper cutter side of the work. CONSTITUTION:A cutting-in groove 10 in 5-30% of the plate thickness is formed previously onto a work plate 1 along a cutting line, in other words, onto the contact-side surface with a transfer cutter 2 on the cutting-out plate 1b side as the uppersurface on the side where the dragged part of the body plate 1a side is formed, by the revolution of a sawing machine 9 arranged before a shear S along the cutting direction. Since the surface part of the plate 1 does not follow to the transfer cutter 2 and is separated from the cutting-out plate 1b, by the groove 10 on the plate side 1a, the formation of the dragged part 8 is prevented, or the formation of the dragged part 8 is very little.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a shearing method.

(Background Art) FIGS. 1 to 3 show a conventional method in which a plate-shaped workpiece 1 is divided, for example, at both ears along its longitudinal direction by shearing. Figure 1 shows a shearing style using a side shear, which is usually called a constant rake down cut type.
A workpiece plate 1 is fed longitudinally in the direction of the arrow and is cut by a movable blade 2 and a fixed blade 3. The movable blade 2 is driven up and down by a crank 4 and a connecting rod 5.

FIG. 2 shows a side shear of a rolling cut type, in which a curved movable blade 2 cuts a plate 1 by performing a so-called rolling cut motion in which the movable blade 2 moves while slightly overlapping a fixed blade 3.

Fig. 6 is called a rotary cut type, in which the upper and lower blades 6 and 7 of the round blade rotate in opposite directions in synchronization with the feeding speed of the plate 1 by a pair of upper and lower rotating round blades 6 and 7. This is a method for cutting the board 1.

The above shearing methods are all based on the same processing principle, and FIGS. 4(a) to 4(C) show the shearing process using the rolling cut type shown in FIG. 3. The same figure (a
) is a cross-sectional view taken along the line X-X in FIG. It is divided into a wooden board 1a like a scrap side and a cutout board 1b.

In such a shearing process, as is well known, usually the wooden board 1a
A "sag part" 8 is generated at both the cut parts of the cutting board 1b, but the thickness reduction t of the board 1 due to this "sag part" 8 is 10 to 20% of the normal board thickness T. The droop length (range) e of the droop portion 8 is also approximately the same as the plate thickness T or approximately V2 thereof.

The direction in which the droop length e occurs is the entire length of the plate 1 in the longitudinal direction, that is, the direction perpendicular to the drawing, and this part often becomes a loss part of the product due to the reduction in the plate thickness. . For this reason, a material with a width that takes into account the sagging length e is required from the beginning. Especially when the material has a thick plate thickness T, the ``sag part'' 8 increases proportionally, impairing the yield of the material. Was.

(Summary of the invention) The present invention focuses on the conventional shearing method as described above, and aims to provide a processing method that improves the yield of processed materials by eliminating the problems. The shearing method according to the present invention is a shearing method in which a pair of upper and lower blades generates shearing stress along a cutting line of a workpiece to divide the workpiece, the shearing method comprising: A cut groove along the cutting line is formed on at least the surface of the material on the upper blade side, and the workpiece is divided along the cut groove by the pair of the upper blade and the lower blade.

(Example) An example method of the present invention will be described based on the attached drawings from FIG. 5 onwards. Note that the same or similar members are used in the description of the conventional example. Further, in the figure, S indicates a shearing machine of any type and style shown in FIGS. 1 to 3.

According to this, 9 in the figure is a saw (
Saw machine) comes out. By this rotation by the saw 9, a cut groove 10 of about 5% to 30% of the thickness T of the plate is previously provided in the plate 1 along the cutting line (FIG. 6(a)). As shown in FIG. 6(b), this cutting groove 10 is formed on the upper surface of the wooden board 1a side where the sag occurs, that is, on the side where the movable blade 2 (or the upper blade 6) comes into contact with the cutting plate 1b side. Can be placed on the surface. As shown in FIG. 1D, the surface of the wooden board 1a does not follow the movable blade 2 and is separated from the cutting board 1b by the cutting grooves 10. As a result, the "sag" 8 as shown in FIG. 4(C) does not occur, or even if it does, it will be very slight.

The cutting depth and cutting speed of the saw 9 for drilling the cutting grooves 10 are normally slower than those of the shearing machine S, but by making the depth of the cutting grooves 10 shallow, the cutting speed can be reduced to the same level as that of the shearing machine S. It is also possible to use it at a cutting speed of . Also,
A plate 1 to be processed by providing a cutting groove 10
Since the equivalent plate thickness of is reduced, the shearing force is small, and the shearing capacity of the shearing 4@lS itself can be lowered, making it possible to downsize.

In the above embodiment, the cutting groove 10 was provided by the saw 9 only on one side of the front surface of the plate 1, but it is of course possible to provide it on both sides if permitted under various conditions. Moreover, it does not matter whether the shearing machine S and the saw 9 are integrated or separated.
The same effect can be achieved even if the groove 10 is provided, and the above-mentioned method can also be applied to a so-called cutting type shearing machine that cuts the plate 1 at right angles to the longitudinal direction. It can be applied by procedures such as

(Effects of the Invention) As can be understood from the above, according to the shearing method of the present invention, drooping of the workpiece that occurs during shearing can be expected to be significantly reduced compared to conventional methods. This has the effect of improving the material yield.

[Brief Description of the Drawings] Figures 1 to 6 show a conventional shearing method for shearing a workpiece, and Figure 4(a) is a longitudinal cross-sectional view taken along the line X-X in Figure 6. , (b) and (c) respectively show longitudinal cross-sectional views of the conventional shearing process. FIG. 5 is a schematic diagram showing the shearing mode according to the embodiment method of the present invention, and FIGS. 6(a) to 6(d) are longitudinal cross-sectional views of the shearing process. Work material plate, 1a...wood board, 1b...
Cutting plate, '2.3...Pair of upper and lower blades, 6,7...Pair of round upper and lower blades, 8...Dip, 9...Saw, 1o...Cut Sink groove, S... shearing machine, T...
Plate thickness of workpiece material, t°°° plate thickness reduction dimension, e...sag length. Patent applicant: Mitsubishi Heavy Industries, Ltd. Figure 1 Figure 2 Figure 3 (a) (b) (C) Figure 4 Figure 5 - Figure 6

Claims (1)

[Claims] A shearing method in which a pair of upper and lower blades generates shearing stress along a cutting line of a workpiece to divide the workpiece, the method comprising: cutting the workpiece at least on the upper blade side; A shearing process characterized by drilling a cutting groove along a cutting line, and dividing the workpiece by a pair of the upper blade and the lower blade along the cutting groove. Method.