JPH0579441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a metal plate cutting device that cuts a metal plate with a pair of circular rotary blades while moving the metal plate.

(Prior art) Conventionally, rotary shears, so-called side trimmers, have a pair of circular rotary blades arranged parallel to each other, and because the width of the rolled metal plate is not uniform, the entire edge of the plate is sheared continuously. It is used to align width dimensions.

Further, there is a metal plate cutting device in which a rotary blade is inclined toward the plate surface and the pass line direction (metal plate traveling direction). As such a metal plate cutting device, there is, for example, a round-blade edge shearing machine described in Japanese Utility Model Application Publication No. 50-55691. This shearing machine is characterized in that an eccentric sleeve and a universal cam are rotatably attached to the rotating shafts of the upper and lower blades, respectively, so that the blades can be tilted appropriately in the shearing direction and the pass line direction. By tilting the rotary blade, it is possible to improve product quality, shear thick plates, and extend the life of the blade.

(Problems to be Solved by the Invention) At the plate edge shearing site, cutting conditions such as plate restraint, meandering, and flatness are unstable. Also, especially in recent years,
Due to the dramatic improvement in rolling mill plate shape control technology, it has become possible to obtain a constant width except for the partial widening part during unsteady rolling, and it is no longer necessary to cut only the partial widening part intermittently. It's here.

However, because the technology for cutting with a cutting allowance equal to or less than the plate thickness (hereinafter referred to as ultra-thin cutting) and intermittently cutting only partial widening portions (hereinafter referred to as partial cutting) has not yet been completed, conventional side trimmers are still used to cut all parts. The edge of the plate is continuously sheared with a cutting allowance greater than the thickness of the plate.

When attempting to perform ultrafine cutting or partial cutting using the conventional blade arrangement, the following defects occur and the cutting cannot be performed properly.

(b) Under loose plate restraint conditions at the cutting work site, at the start of cutting, the plate slides on the rotating blade, creating in-plane forces in the width direction and cutting direction, and the plate tries to escape from the rotating blade. In particular, when the edge shape of the material plate is rounded, the amount of escape is large and the rotary blade has poor penetration.

(b) When the board is completely constrained in the width direction and the rotary blade is forced into it, the board becomes easily deformed due to buckling, and when cutting very finely, burrs increase and the cut surface becomes rough. .

(c) The shape and flow direction of scrap are unstable, making it difficult to collect scrap.

SUMMARY OF THE INVENTION An object of the present invention is to provide a metal plate cutting device that eliminates the drawbacks of the prior art and is capable of ultrafine cutting and partial cutting.

(Structure of the Invention) A metal plate cutting device of the present invention cuts a metal plate with a pair of circular rotary blades having a cylindrical circumferential surface while moving the metal plate, wherein the first rotary blade has a rotary blade axis. The second rotary blade is parallel to the metal plate surface, the peripheral surface is in contact with the metal plate surface, and the second rotary blade has an angle of 1° with respect to the metal plate surface when the rotary blade axis is oriented toward the center of the plate within a plane that includes the first rotary blade axis. The rotary blade axis is tilted at ~45° and the rotary blade axis is tilted by 0.3° to 12° with respect to the plane perpendicular to the metal plate traveling direction so that the cutting edge circle of both rotary blades opens toward the downstream side in the metal plate traveling direction. It is characterized by

Hereinafter, the present invention will be explained in detail based on the drawings.

In FIG. 1, the plane P and the straight line XX are perpendicular to each other, and the point of intersection is defined as a point O.

The metal plate cutting device of the present invention includes a pair of circular rotary blades 1 and 2.

The first rotary blade 1 is disposed at a position where the rotary blade axis 3 is on the plane P and the blade edge circle 5 is in contact with the O point.

The second rotary blade 2 has a rotary blade axis 4 on the first plane P.
It is located at an angle i inclined with respect to the rotary blade 3 (the inclined angle i is hereinafter referred to as the inclination angle), and the cutting edge circle 6
Place it at a position where is in contact with point O.

Next, both rotary blades 1 and 2 are arranged at a position where a straight line X-X perpendicular to the plane P at point O forms an angle j with respect to the cutting (pass line) direction Z'-Z' ( The angle j between Z'-Z' and straight line X-X is as follows:
(referred to as the toe-in angle).

That is, the second rotary blade axis 4 is inclined with respect to the first rotary blade axis 3 within a plane including the first rotary blade axis 3,
The two rotary blades 1 and 2 are arranged at positions where the plane including the two rotary blade shafts 3 and 4 is not perpendicular to the cutting direction Z'-Z'.

The inclination angle i is the minimum angle in order to improve the biting ability of the rotary blade and give tension in the width direction to the plate.
The angle ranges from 1° to a maximum angle of 45°, and the preferred range is 5° to 15°.

The toe-in angle j is in the range from a minimum angle of 0.1° to a maximum angle of 12°, with a preferable range of 0.3° to 5°, in order to improve the biting property of the rotary blade and to avoid interference between the second rotary blade 2 and the plate. °.

The shapes of the first rotary blade 1 and the second rotary blade 2 are
As shown in the figure, it has a cylindrical shape, and the cutting edge angles θ ₁ and θ ₂ are each 90°.

One of the rotary blades is provided with a gap adjustment mechanism between both rotary blades and a relative position adjustment mechanism between both rotary blades in order to avoid mutual interference between the rotary blades and to obtain optimal cutting conditions.

As for the driving method of the rotary blade, there are two types: driving both rotary blades, and driving the plate with both rotary blades free, and cutting is possible in either case.

When trimming both edges of a metal plate, a pair of upper and lower rotating blades are arranged opposite to each other on the left and right sides of the pass line. In addition, when cutting only one edge of a metal plate, such as when preparing a welding groove, support the metal plate with a presser roller that can rotate in the plate feeding direction, and restrain the metal plate in the width direction. .

(Function) In FIG. 3, t indicates the plate thickness, M indicates a very fine cutting area, and N indicates a cutting area where the cutting allowance is greater than the plate thickness.

According to the cutting method of the present invention, the cutting line is a straight line Z-Z
, and ΔABC is the delta cutting region,
〓BCDE will be called the ultra-fine cutting region. Further, T indicates tension in the plate width direction.

In the delta cutting region, the cylindrical surface of the first rotary blade constitutes a pressure receiving surface for the cutting reaction force, and the second rotary blade acts as a cutting blade, scraping off the scrap while applying tension T in the width direction to the plate.

In the ultra-fine cutting area, after the plate surface and the cutting edges of the double rotary blades come into contact, the second rotary blade enters the plate while applying tension T in the width direction, and when the cutting force exceeds the shear load of the plate, the double blade tips Along the straight line connecting the two, cracks occur, grow, and merge, and the plate is sheared.

The above cutting action will be explained in more detail by comparing the method of the present invention and the conventional method.

FIG. 4 shows the case according to the method of the present invention, in which the cutting process progresses sequentially: A is the initial stage of cutting, B is the middle stage of cutting, and C is the final stage of cutting.

First, as shown in FIG. 4A, the material near the cutting edge is deformed due to the biting of the second rotary blade 2. As the biting progresses, the first rotary blade 1
Around the blade edge, the scrap 8 is pressed against the side surface of the blade due to the bending moment during cutting.
As a result, the compressive force near the cutting edge increases, thereby suppressing the occurrence of cracks. On the other hand, since the area around the cutting edge of the second rotary blade 2 is not restrained, cracks 9 occur in the advancing direction of the cutting edge. As the biting progresses further, as shown in FIG. 4C, the crack 9 extending from the cutting edge of the second rotating blade 2 extends to the cutting edge of the first rotating blade 1, and the cutting is completed. At this time, as the cutting edge advances, the crack surface is scraped off by the second rotary blade 2, and the cut surface becomes smooth.

In the above cutting process, the circumferential surface of the first rotary blade 1 is in contact with the lower surface of the plate 7, as shown in FIG. There is. In the figure, F represents the force that the second rotary blade 2 exerts on the plate 7. The vertical component of cutting force F is
Fcosi balances the vertical component of the force of the first rotary blade 1. Also, the horizontal component of the second rotary blade 2 is Fsini
, and the horizontal component of the first rotary blade 1 is 0. Therefore, the second rotary blade 2 applies a tension T to the plate 7 in the width direction. This tension T is balanced with the tension T by a pair of rotary blades (not shown) arranged on the opposite side of the pass line, and the plate 7 is in a stretched state between the pair of rotary blades facing each other on the left and right sides. As a result, the cutting edge can easily penetrate (cut) into the plate 7, achieving extremely fine or partial cutting. Note that the frictional force between the rotary blades 1, 2 and the plate 7 is small, so it is ignored.

FIG. 5 shows the case of the conventional method, and similarly to FIG. 4, A shows the initial stage of cutting, B shows the middle stage of cutting, and C shows the final stage of cutting.

As shown in FIG. 5A, the material near the cutting edge is deformed due to the biting of the second rotary blade 2. As the biting progresses, cracks 9 are generated near the cutting edge of the first rotary blade 1 and near the cutting edge of the second rotary blade 2 in the direction of movement of the cutting edge, as shown in FIG. 5B. As the cutting progresses further, cracks 9 extend from above and below and meet together, as shown in FIG. 4C, and the cutting is completed. Since the crack surface is not scraped off by the rotary blades 1 and 2, the cut surface becomes a rough surface.

In the above cutting process, in the conventional method in which the upper and lower rotary blades 1 and 2 are both inclined toward the plate surface,
As shown in Fig. 5A, the magnitude of the horizontal component of the force exerted by the first rotary blade 1 and the second rotary blade 2 is
Fsini, and the directions of the horizontal components are opposite to each other.
Therefore, the horizontal components of the forces exerted by the upper and lower rotary blades 1 and 2 cancel each other out, resulting in a tension T in the width direction of the plate.
does not occur. For this reason, the cutting edge does not dig into the plate 7 very well, making it impossible to perform very fine or partial cuts.

(Example) A cutting experiment was conducted under the following conditions.

Plate material...Steel Plate Plate thickness...1.2~4.5mm Diameter of rotating blade...380mm Cutting edge angle _θ1 ...... _θ1 = 90° Cutting edge angle _θ2 ...... _θ2 =90° Inclination angle i...1 °≦i≦45° Tow-in angle j...0.3≦j≦12° Cutting speed...50 to 400 m/min As a result of the experiment, it was possible to cut even if the cutting allowance was less than the plate thickness. It was also possible to cut the plate intermittently in the longitudinal direction.

(Effects of the Invention) The present invention allows the plate to be pulled toward the scrap side by the tilting effect of the second rotary blade even in a high-speed cutting area where the plate is loosely constrained during on-site operation, so that the edge shape of the material plate can be adjusted. To prevent the board from escaping and deforming in any way. In addition, even when cutting in delta or very thin, burrs do not occur, a good cut surface can be obtained, and the directionality of the scrap outflow can be stabilized.

That is, the present invention is a cutting shear dual-purpose cutting blade mechanism that can perform cutting in the delta cutting area and shearing in the ultra-fine cutting area, and also improves cutting conditions by imparting tension in the width direction to the plate. The purpose of the invention is to enable cutting with a cutting allowance less than the plate thickness and partial cutting.

With this cutting device, the cutting allowance for the metal plate can be significantly reduced, making it possible to dramatically improve economic efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the arrangement of the rotary blade of the present invention;
Fig. 2 is a sectional view of the rotary blade, Fig. 3 is a sectional view illustrating the state of cutting the plate edge, Fig. 4 is an explanatory drawing of the cutting process according to the present invention, and Fig. 5 is a sectional view of the cutting process according to the conventional method. It is an explanatory diagram. 1...First rotary blade, 2...Second rotary blade, 3...
1st rotary blade axis, 4...2nd rotary blade axis, 5...1st
Cutting edge circle of the rotary blade, 6... Cutting edge circle of the second rotating blade, 7
...Board, 8...Scrap, 9...Crack.

Claims (1)

[Claims] 1 In a device that cuts a metal plate with a pair of circular rotary blades whose circumferential surface is a cylindrical surface while moving the metal plate, the first rotary blade has a rotary blade axis parallel to the metal plate surface and whose circumferential surface is parallel to the metal plate surface. The rotary blade axis of the second rotary blade is inclined by 1° to 45° toward the center of the plate with respect to the metal plate surface within the plane containing the first rotary blade axis, and the cutting edge circles of both rotary blades are A metal plate cutting device characterized in that a rotary blade axis is inclined at 0.3° to 12° with respect to a plane perpendicular to the metal plate traveling direction so as to open toward the downstream side in the metal plate traveling direction.