JPH11333621A - Cutting device for steel material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting device to bring a weld H-shaped steel with a hole type cutter during cutting conveyance into contact with a hole type cutter and prevent provision of a decreased life for the cutter and the occurrence of a flaw to a steel surface. SOLUTION: This cutting device comprises a fixed blade 16 having a hole type cutter 16a through which a flange of an H-shape steel 11 passes in a horizontal plane and a hole type cutter 17a in the same shape; and a moving blade 17 movable in an oblique downward direction crossing a conveyance direction and arranged in juxtaposition with the fixed blade 16. Two sets of guide rollers 24 and 25 are arranged in a position, further approaching the H-shape steel 11 than the cutting edge of the hole type cutter 17a in a manner to make contact with both the lower flange outer surface of an H-shape steel 11 and a web plane on the side, spaced away from the moving blade 17 through movement during cutting, and guide rollers 24 and 25 are arranged in a position to further approach the H-shape steel 11 than the cutting edge of the hole type cutter 16a of the fixed blade 16 in a manner to make contact with a web plane on the spaced-away side. Contact between the H-shape steel 11 and the fixed blade 16 and between the moving blade 17 and the hole type cutter 16a is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cutting a steel material such as a section steel, a steel pipe, and a steel plate, and more particularly to an apparatus for cutting a steel material suitable for use in an apparatus for cutting a section steel such as an H-section steel.

[0002]

2. Description of the Related Art To cut a long steel material such as a shaped steel, a steel pipe, a steel plate or the like into a predetermined length, a dedicated cutting device has been conventionally used. For example, a welded H-shape manufactured by combining two flange materials obtained by unwinding three slit coils obtained by cutting a hot-rolled steel sheet to a predetermined width and one web material in a combined H-shape and welding. A steel cutting device is disclosed in Japanese Utility Model Laid-Open No. 5-9826 and Japanese Patent Laid-Open No. 5-57.
No. 523 proposes this.

FIG. 7 is a perspective view showing a welding H-section steel cutting device 1 proposed by Japanese Utility Model Laid-Open No. 5-9826. The cutting device 1 has a fixed blade 2 having a hole-shaped blade 2a having a shape through which a conveyed shaped steel passes, and a hole-shaped blade 3a having the same shape as the hole-shaped blade 2a. And a movable blade 3 arranged in parallel with the fixed blade 2 in the transport direction so as to be movable in a direction crossing with the fixed blade 2 (in the direction of the arrow in the figure). In FIG. 7, for convenience of explanation, the movable blade 3 is shown in a detached state, and is actually arranged at a position shown by a two-dot chain line.

At the time of cutting, the conveyed welded H-section steel is
The hole-shaped blade 2a and the hole-shaped blade 3a are made to penetrate, and the welded H-section steel is cut by moving the movable blade 3 obliquely downward by about 20 mm at an angle of, for example, 60 degrees. The blade 3 is returned to the original position by, for example, a spring mechanism or the like, and the one-cycle cutting operation on the welded H-section steel is completed.

[0005]

However, the cutting device 1 does not have a function of guiding the welded H-section steel conveyed through the hole-shaped blade 2a and the hole-shaped blade 3a, respectively. Therefore, the flange and web of the welded H-section steel are not
And it is conveyed while contacting each end surface of the hole-shaped blade 3a. Therefore, the hole-shaped blade 2a and the hole-shaped blade 3a
Is worn during transportation not related to cutting.

[0006] In the cutting apparatus 1, the movable blade 3 generally cuts the welded H-section steel by moving downward. Therefore, the pass line (lower flange surface of the welded H-beam to be conveyed) in each facility disposed downstream of the cutting device 1 is 50 mm larger than the pass line in the cutting device 1.
When the movable blade 3 is lowered at the time of cutting, the welded H-section steel cut by the movable blade 3 and each equipment arranged downstream of the cutting device 1 is not pinched. Have been.

[0007] Therefore, the welded H-section steel after passing through the cutting device 1 is transported in an overhanging state, that is, in a cantilever state, so that the distance from the cutting device 1 to the tip of the welded H-section steel increases. Accordingly, the load received by the hole-shaped blade 2a and the hole-shaped blade 3a that support the lower flange of the welded H-section steel by the own weight of the welded H-section steel increases. Therefore, wear of the grooved blade 2a and the grooved blade 3a becomes more remarkable. In extreme cases, the contact resistance between the welded H-section steel, the hole-shaped blade 2a, and the hole-shaped blade 3a raises the temperature of the hole-shaped blade 2a, the hole-shaped blade 3a, and the hole made of a high-alloy steel that is vulnerable to thermal cracks. Cracks may occur due to thermal effects on the heat-treated portions of the mold blade 2a and the hole-shaped blade 3a.

Further, a hole-shaped blade 2a is provided on the surface of the welded H-section steel.
Flaws occur due to contact with the hole-shaped cutting tool 3a, which significantly impairs the quality of the welded H-section steel. In particular, when a galvanized steel sheet was used for the flange material and the web material of the welded H-section steel, the surface was soft, so the zinc was cut off by the hole-shaped blade 2a and the hole-shaped blade 3a, and the zinc was scratched and cut off. Zinc accumulates between the blades, gradually blocking the hole shapes of the hole-shaped blade 2a and the hole-shaped blade 3a, and in the worst case, the welded H-section steel cannot pass.

[0009] It is an object of the present invention to suppress or eliminate contact between a steel material such as a welded H-section steel and a hole-type blade during transport without affecting the above-described one-cycle steel material cutting operation. Accordingly, an object of the present invention is to provide a steel material cutting device capable of suppressing abrasion and temperature rise of a hole-shaped blade, and prolonging the life of the hole-shaped blade and suppressing flaws on a steel material surface.

[0010]

Means for Solving the Problems As a result of repeated studies to solve the above problems, the present inventors have prevented one or both of the movable blade and the fixed blade from contacting the steel material with the hole-shaped blade. The inventor has found that the provision of the guide member can minimize the contact between the steel material and the hole-shaped cutting tool during transportation, and has further studied based on this finding, thereby completing the present invention.

Here, the gist of the present invention is to provide a fixed blade having a hole-shaped blade having a shape through which a steel material to be conveyed passes and a fixed blade having a hole-shaped blade having a shape through which the steel material passes, and a direction in which the steel material is conveyed. A movable blade that is movable in the intersecting direction and is provided in parallel with the fixed blade in the transport direction, and one or both of the movable blade and the fixed blade move with the steel material by contacting the steel material during transport. A guide member that guides the steel material while preventing contact of one or both of the hole-shaped blade and the fixed blade with the hole-shaped blade, and a guide member that is separated from the steel material when cutting the steel material, is provided, respectively. This is an apparatus for cutting steel materials.

In the above-described steel material cutting apparatus according to the present invention, it is desirable that the guide member is disposed at a position closer to the steel material than the cutting edge of the movable blade or the fixed blade. Further, when the steel material is a shaped steel in the steel material cutting apparatus according to the present invention, the movable blade moves obliquely downward with respect to the flange of the shaped steel, thereby cutting the shaped steel. desirable. Further, in the steel material cutting apparatus according to the present invention, when the shaped steel is transported in a transporting posture in which the flange is substantially horizontal, the guide member is connected to the outer surface of the lower flange of the shaped steel and the movable blade at the time of cutting. The moving blade is provided with a plurality of moving blades so as to abut any of the web planes on the side away from the web planes of the shaped steel that are moved by moving, and the shaped steel is conveyed in a conveying posture in which the flange is substantially horizontal. In the case where the guide member is provided, at least the guide member is provided on the fixed blade so as to abut on a web plane on a side away from among the web planes of the shaped steel moving by moving the movable blade during cutting. However, both are desirable.

More specifically, the present invention relates to a fixed blade having a hole-shaped blade through which an H-shaped steel conveyed in a posture in which a flange is in a horizontal plane, a hole-shaped blade having the same shape as the H-shaped steel, The movable blade, which is movable in a diagonally downward direction intersecting with the transport direction and is provided in parallel with the fixed blade, the outer surface of the lower flange of the H-shaped steel, and the H-shaped steel which is moved by the movement of the movable blade during cutting. Two or more sets of guide rollers provided at a position closer to the H-shaped steel than the cutting edge of the hole-shaped blade of the movable blade so as to abut against any of the web planes on the side away from the web planes; The cutting device includes a guide roller provided at a position closer to the H-shaped steel than the cutting edge of the hole-shaped blade of the fixed blade so as to abut on a web plane on a side of the moving H-shaped steel that moves away. These guide rollers prevent the H-shaped steel from contacting the fixed blades and the movable blades with the hole-shaped blades.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a steel material cutting apparatus according to the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, an example will be described in which the steel material is a welded H-section steel, and the welded H-section steel is transported in a transport position in which the flange is in a horizontal plane.

FIG. 1 is an explanatory view schematically showing a production line 12 of a welded H-section steel 11 provided with a cutting device 10 of the present embodiment. As shown in FIG. 1, in a production line 12 including the cutting device 10, a web material 13 b and two flange materials 13 a are combined into an H-shaped cross section by unwinding a base material coil, respectively. A high-frequency current is applied between the flange members 13a, 13a by a high-frequency current generator 14, and the melted web material 13b and the flange materials 13a, 13a are pressed and welded by a pair of pressure-contact rolls 15a, 15b to form an H-shaped weld. Steel (hereinafter simply referred to as "H-section steel") 11. The H-shaped steel 11 is transported and cut into a predetermined length by the cutting device 10 to obtain a finished product.

The moving blade in the cutting apparatus 10 of the present embodiment moves the diagonally downward direction to cut the H-section steel 11 as described later, so that the H-section steel 11a cut by the cutting apparatus 10 is used. Is set about 50 mm below the pass line in the cutting device 10.

FIG. 2 is a perspective view showing the cutting apparatus 10 of the present embodiment in an exploded state. The cutting device 10 of the present embodiment includes a fixed blade 16, a movable blade 17, and a main body 18 on which these are mounted. Hereinafter, these will be sequentially described.

[Fixed Blade 16] As shown in FIG.
Is a flat plate made of tool steel having a substantially rectangular outer shape, and a central portion of the flat plate through which the H-shaped steel 11 to be transported can pass.
A hole-shaped cutting tool 16a is formed. The fixed blade 16
The fixed blade 16 is fitted in a flat plate-shaped fixed blade holder 19 having a concave portion having a fitting shape, and is fixed by fastening bolts 20 to four corners.

FIG. 3A is a front view schematically showing the fixed blade holder 19. The fixed blade holder 19 also has a hole-shaped blade 16
An H-shaped through hole 19a having a size corresponding to a is formed, and the H-shaped steel 11 can pass through both the fixed blade 16 and the fixed blade holder 19.

As shown in FIGS. 2 and 3, the upper left corner and the lower right corner of the plane of the fixed blade holder 19 have a triangular prism for sliding a movable blade holder 23, which will be described later, diagonally downward. The mold slide blocks 19b and 19c are fixed.

In this embodiment, as shown in FIG.
A pair of guide rollers having a diameter smaller than the thickness of the fixed blade holder 19, horizontally above the upper horizontal hole 19a-1 of the through hole 19a.
(Bearings) 21 and 21 are supported so as to be driven and rotated. In addition, a pair of guide rollers (bearings) 22 having a diameter smaller than the plate thickness of the fixed blade holder 19 are rotated perpendicularly to one side of the vertical hole 19a-2 of the through hole 19a so as to be driven to rotate. Supported.

These guide rollers 21, 21 and 22, 22
Are arranged closer to the H-shaped steel 11 than the cutting edge of the hole-shaped blade 16a, and are brought into contact with the H-shaped steel 11 being conveyed, whereby the holes of the H-shaped steel 11 and the fixed blade 16 are formed. Die knife 16a
It is a guide member for preventing contact with the guide member.

In this embodiment, the guide rollers 21, 21 and
22 and 22 are arranged as a pair, and the distance between the rollers is set as large as possible. As a result, the H-shaped steel 11 can be reliably guided, and the manufacturing cost and the assembling workability can be improved.

As described above, the guide rollers 21, 21 and
22 and 22 are arranged such that their outer peripheral surfaces slightly protrude from the cutting edge of the hole-shaped blade 16a. Guide roller
If the distance between the outer peripheral surfaces of 21, 21 and 22, 22 and the cutting edge of the hole-shaped cutting tool 16a is too small, it is difficult to completely prevent the contact between the H-shaped steel 11 and the cutting edge of the hole-shaped cutting tool 16a. ,on the other hand,
If it is too large, the gap between the H-shaped steel 11 and the cutting edge of the hole-shaped blade 16a becomes large, and the material permeability of the H-shaped steel 11 is alienated. For example, when the distance (margin gap) between the H-section steel 11 and the cutting edge of the hole-shaped cutting tool 16a is 3 mm to 4 mm, the guide rollers 21 and
The outer peripheral surface of 21, 22 and 22 is 0.5
It is desirable to arrange so as to protrude about 1 mm from mm.

The guide rollers 21 and 21 are used to transport the H-shaped steel 11
Fixed blade holder 19 so that it contacts the outer surface of the upper flange
Is provided. The guide rollers 22, 22 are fixed blade holders so as to abut on the web plane 13a of the H-shaped steel 11 that moves as the movable blade 17 moves during cutting, and which is away from the blade edge. 19 is provided. Thereby, the moving blade 17 moves at the time of cutting, so that the H-shaped steel 11
, The guide rollers 21, 21 and 22, 22 do not abut on the H-section steel 11. Therefore, the guide roller 21,
Even if H-shaped steel 11 is cut by installing 21 and 22, 22,
The H-section steel 11 is not deformed.

In this embodiment, since the guide rollers 21, 21 and 22, 22 are incorporated in the fixed blade holder 19, the fixed blade holder
Fixed blade 16 and guide rollers 21, 21 and 2 fitted in 19
The distance between 2 and 22 can always be kept constant without requiring readjustment after setting.

Even if the guide rollers 21 are not provided, the contact between the H-shaped steel 11 and the hole-shaped blade 16a is prevented. H
This is because the shape steel 11 often hangs down due to its own weight, and hardly contacts the upper horizontal hole 19a-1 of the through hole 19a. The main purpose of installing the guide rollers 21, 21 is to guide the H-shaped steel 11 more reliably. In the present embodiment, the fixed blade 16 is configured as described above.

(Moveable Blade 17) As shown in FIG.
Is a flat plate having a substantially rectangular outer shape and made of tool steel having the same shape as the fixed blade 16, and an H-shaped hole-shaped cutting tool 17a through which the H-shaped steel 11 to be conveyed can pass is provided at the center thereof. Are drilled. The movable blade 17 is fitted into a flat movable blade holder 23 having a recess having a shape into which the movable blade 17 fits, and is fixed by fastening bolts 20 at four corners.

FIG. 3B is a front view schematically showing the movable blade holder 23. The movable blade holder 23 also has a hole-shaped blade 17
An H-shaped through hole 23a having the same size as a is formed, and the H-shaped steel 11 can penetrate both the movable blade 17 and the movable blade holder 23.

The upper left corner and lower right corner of the movable blade holder 23 are cut obliquely so as to slide with the slide blocks 19b and 19c fixed to the fixed blade holder 19. Further, the lower left corner of the movable blade holder 23 is cut obliquely so as to abut a slide block 32 described later.

In the present embodiment, the lower horizontal hole 2
3a-1, a pair of guide rollers (bearings) 24, 24 having a diameter smaller than the thickness of the movable blade holder 23,
The shaft is supported so as to rotate. A pair of guide rollers 25, 25 having a diameter smaller than the plate thickness of the fixed blade holder 23, are vertically supported on one side of the vertical hole 23a-2 of the through hole 23a so as to be driven to rotate. .

The guide rollers 24, 24 and 25, 25
Are arranged closer to the H-section steel 11 than the cutting edge of the hole-shaped cutting tool 17a. Die knife 17a
It is a guide member for preventing contact with the guide member.

In this embodiment, the guide rollers 24, 24 and
25, 25 are arranged as a pair, and the distance of each bearing is set as large as possible. As a result, the H-shaped steel 11 is reliably guided, and the manufacturing cost and the workability for assembling are improved.

FIG. 4 is a partial vertical sectional view showing the positional relationship between the guide roller 24 and the hole-shaped blade 17a. As shown in the figure, the guide roller 24 is disposed such that its outer peripheral surface is located at a position protruding from the cutting edge of the hole-shaped blade 17a by a distance d. If the distance d between the outer peripheral surfaces of the guide rollers 24 and 24 and the cutting edge of the hole-shaped blade 17a is too small, the H-shaped steel 11 and the hole-shaped blade 17a
However, if it is too large, the gap between the H-shaped steel 11 and the cutting edge of the hole-shaped cutting tool 17a becomes large, and the permeability of the H-shaped steel 11 is alienated. .
For example, the distance between the H-section steel 11 and the cutting edge of the slotted cutter 17a
When the (margin gap) is 3 mm to 4 mm, the distance d between the outer peripheral surface of the guide rollers 24, 24 and 25, 25 and the cutting edge of the hole-shaped blade 17a should be about 0.5 mm to 1 mm. desirable.

The guide rollers 24, 24 move the moving blade 17 during cutting.
The movable blade holder 23 is provided on the movable blade holder 23 so as to abut on the outer surface of the lower flange of the H-shaped steel member 11 which moves as a result.
Further, the guide rollers 25, 25 are moved by the movable blade holder so that the movable blade 17 comes into contact with a web plane 13b on the side of the H-section steel 11 that moves by the movement of the movable blade 17 during cutting. 23. As a result, even when the H-shaped steel 11 moves due to the movement of the movable blade 17 at the time of cutting, the guide rollers 24, 24 and 25, 25
Do not abut. Therefore, the guide rollers 24, 24 and 2
The H-shaped steel 11 is not deformed even if the cutting is performed by installing 5, 25.

In this embodiment, since the guide rollers 24, 24 and 25, 25 are incorporated in the movable blade holder 23, the movable blade holder
The moving blade 17 and the guide rollers 24, 24 and 2 which are fitted into 23
The distance between 5, 25 can always be kept constant without the need for readjustment after setting. In the present embodiment, the moving blade 17 is configured as described above.

(Main Body 18) The fixed blade 16 and the movable blade 17 of the present embodiment are mounted on the main body 18. The main body 18 includes a bottom plate 26, a groove-shaped frame plate 28 vertically fixed to the bottom plate 26 via the fixing block 27, a fixed block 29 for vertically fixing the fixed blade holder 19 to the bottom plate 26, and a frame plate 28. And a ceiling plate 30 fixed to the upper part of the vehicle. That is, after the triangular prism type slide block 32 is mounted inside the groove of the frame plate 28 fixed to the bottom plate 26, the moving blade holder 23 to which the moving blade 17 is fastened and fixed is attached.
Attach.

Next, the fixed blade holder 19, to which the fixed blade 16 is fastened and fixed, is set on the bottom plate 26 via the fixed block 29, side by side with the frame plate 28. At this time, the respective contact surfaces of the frame plate 28 and the fixed blade holder 19 are provided with a concave portion and a convex portion that are fitted to each other, whereby the frame plate 28 and the fixed blade holder
19 is securely and easily installed at a predetermined distance. At this time, the inclined surfaces provided at the lower right corner and the upper left corner of the movable blade holder 23 contact the inclined surfaces of the two slide blocks 19b and 19c fixed to the fixed blade holder 19, and the movable blade The inclined surface provided at the lower left corner of the holder 23 comes into contact with the inclined surface of the slide block 32.
As a result, the movable blade holder 23 is disposed so as to be movable by an appropriate distance in the double arrow direction in FIG. 3B with respect to the fixed blade holder 19.

Then, the main body 18 is assembled by fixing the ceiling plate 30 to the upper portion of the frame plate 28 using bolts.
The fixed ceiling plate 30 is provided with a through hole, and a knocker 33 that contacts the upper surface of the movable blade holder 23 in this through hole,
It is mounted movably up and down.

The frame plate 28 constituting the main body 18 has a through hole 28
a through the through hole 28a.
31a is fixed. This screw shaft 31a and slide block
A coil spring 31b is mounted between the coil spring 31b. The movable blade holder 23 is urged in the double arrow direction in FIG. 3B by the spring force generated by the coil spring 31b, and the upper surface of the movable blade holder 23 contacts the inner surface of the ceiling plate 30. In this way, the movable blade holder 23 holds the coil spring 31
b, it is urged upward, and is supported in contact with the ceiling plate 30. At this time, the blade 16a of the fixed blade 16 and the movable blade 16a
The hole-shaped cutting tool 17a of 17 coincides with the vertical plane, and the H-shaped steel 11
Can pass through.

FIG. 5 is an end view of the cutting apparatus 10 of the present embodiment assembled in this way, taken along the line AA in FIG. In FIG. 5, when the knocker 33 is pushed downward, the movable blade holder 23 compresses the coil spring 31b via the slide block 32. Thus, the movable blade holder 23 is appropriately moved downward in the direction of the double arrow in FIG. 3B with respect to the fixed blade holder 16 while being guided by the slide blocks 19b and 19c. Thereby, the H-section steel 11 is cut. When the pushing of the knocker 33 is removed, the slide block 32 is urged rightward by the spring force generated by the coil spring 31b, and the movable blade holder 23 is moved in the direction indicated by the double arrow in FIG. Move upward to return to the original position. For this reason, the knocker 33 also returns to the original position.

As described above, in the cutting apparatus 10 of the present embodiment, the movable blade 17 is arranged in parallel with the fixed blade 16 in the transport direction so as to be movable in a direction crossing the transport direction of the H-section steel 11. The H-shaped steel 11 is cut by moving it obliquely downward with respect to the flange of the H-shaped steel 11.

The cutting device 10 of the present embodiment is configured as described above. Next, the operation of the cutting device 10 will be described.
FIGS. 6A and 6B are explanatory views showing a situation where the H-shaped steel 11 is cut by the cutting device 10. FIGS. 6A and 6B are a front view and a side view at the start of cutting, and FIGS. ) And FIG.
(d) is a front view and a side view at the time t ₁ second after the start of cutting, FIGS. 6 (e) and 6 (f) are a front view and a side view at the time t ₂ seconds after the start of cutting, and FIG. ) And FIG.
(h) is a front view and a side view at the elapsed point cut after the start t ₃ seconds, FIG. 6 (i) is a side view at the elapsed point cut after the start t ₄ seconds, FIG. 6 (j) is cut after the start t ₅ It is a side view at the time of a lapse of second.

As shown in FIGS. 6 (a) and 6 (b), at the start of cutting, the hole-shaped blade 16a of the fixed blade 16 fixed to the fixed blade holder 19 and the moving blade fixed to the movable blade holder 23. The hole-shaped blade 17a of the blade 17 coincides with the hole-shaped blade 17a, and stops when the H-shaped steel 11 penetrates them. At the start of cutting, that is, at the time of transport, the guide rollers 24, 24 provided on the movable blade holder 23 are in contact with the outer surface of the lower flange of the H-section steel 11, and the other guide rollers 21, 22, and 25 are also hole-shaped blades. 16a and hole tool 17
a Since they are arranged closer to the H-shaped steel 11 than their respective tips, they come into contact with the H-shaped steel 11 in accordance with the displacement of the H-shaped steel 11 during transportation, and the hole-shaped blade 16a and the hole-shaped blade 17a The contact between each tip and the H-section steel 11 is prevented.

[0045] As shown in FIG. 6 (c) and FIG. 6 (d), the at time t _1, the mobile blade holder 23 is pushed in the knocker 33.
As a result, the movable blade holder 23 moves obliquely downward along the inclined surfaces of the slide blocks 19b and 19c provided on the fixed blade holder 19.

As a result, the tip of the hole-shaped blade 17a of the movable blade 17 held by the movable blade holder 23 approaches the web of the H-section steel 11 and guide rollers 24, 24 fixed to the movable blade holder 23. Moves away from the H-beam 11. Also, the H-shaped steel 11 is lowered by the lowering of the movable blade holder 23, whereby the tip of the hole-shaped blade 16 a of the fixed blade 16 fixed to the fixed blade holder 19 abuts on the web of the H-shaped steel 11. In this way,
As shown in FIG. 6 (b), the web of the H-section steel 11
The end face of the vertical hole of the hole-shaped cutting tool 17a and the hole-shaped cutting tool of the fixed blade 16
It is sandwiched between the end faces of the vertical holes 16a. At this time, all the guide rollers 21 to 24 are separated from the H-shaped steel 11 and do not contact the H-shaped steel 11 that moves with the movement of the movable blade 17.

[0047] As shown in FIG. 6 (e) and FIG. 6 (f), the at time t _2, the first the movable blade 17 moves further obliquely downward, the cutting of the H-beam 11 progresses. All the guide rollers 21, 22, 24, and 25 are separated from the H-shaped steel 11 and do not contact the H-shaped steel 11 that moves with the movement of the movable blade 17.

[0048] As shown in FIG. 6 (g) and FIG. 6 (h), the at time t _3, by the movable blade 17 moves further obliquely downward, the cutting of the H-beam 11 is performed, the mobile blade Even after the cutting, the 17 moves to the final stroke wrapped with the fixed blade 16. All the guide rollers 21 to 24 are separated from the H-shaped steel 11 and do not contact the H-shaped steel 11 that moves with the movement of the movable blade 17.

As shown in FIGS. 6 (i) and 6 (j), the movable blade 17 is provided with a coil spring 31b provided on a knocker 33.
Is returned to the original position by the spring force generated, and the H-section steel 11 is conveyed. As a result, only the guide rollers 24, 24 are in contact with the outer surface of the lower flange of the H-section steel 11, and the other guide rollers 21, 22, and 25 also move in accordance with the displacement of the H-section steel 11 during transportation. 11, and the hole-shaped blade 16 a and the hole-shaped blade 17 a
The contact between each tip and the H-section steel 11 is prevented.

As described above, according to the cutting device 10 of the present embodiment, the guide roller for guiding the web of the H-section steel 11 to the vertical hole 19a-2 of the fixed blade holder 19 on the upstream side of the moving blade 17 that moves. 22 and 22 are provided. Therefore, the H-shaped steel 11 can be guided so that the hole-shaped blade 17a of the movable blade 17 does not contact the H-shaped steel 11 when the H-shaped steel 11 is transported.
Even if it moves diagonally downward from 17, the H-section steel 11 is
Since the web is moved away from the web 22, the web of the H-section steel 11 and the guide rollers 22, 22 are prevented from interfering with each other, thereby preventing the web from being deformed.

Further, according to the cutting apparatus 10 of the present embodiment,
The movable blade holder 23 has guide rollers 24, 24 at positions rearward with respect to the moving direction of the movable blade holder 23 during cutting.
When the movable blade 17 moves diagonally downward during cutting, the guide rollers 24, 24 and 25, 25 which have been guiding the H-section steel 11 are also moved diagonally downward together with the movable blade 17. The H-shaped steel 11 contacts the cutting edge of the hole-shaped blade 16a of the fixed blade 16 and does not move any further. in this way,
Since the guide rollers 24, 24 and 25, 25 move in a direction away from the H-section steel 11, the guide rollers 24, 24, 25, 25 cause the H-section steel 11, the fixed blade 16 and the moving The blade 17 is prevented from contacting with the cutting edge of the hole-shaped blades 16a, 17a, and the guide rollers 24, 24 and 25, 25 do not contact the H-shaped steel 11 at the time of cutting.

The breakdown of the production time of the H-section steel 11 shown in the present embodiment is almost the transport time of the H-section steel 11, and the cutting time of the H-section steel 11 is a short time almost zero. For example, H-section steel
Assuming that the product length of 11 is 10 m and the production speed is 40 m / min, the cutting pitch is 4 pieces / min, that is, a 15-second pitch. Here, since the cutting device for the H-section steel 11 is generally provided with a function of running in synchronization with the H-section steel 11,
The time required for the hole-shaped blades 16a and 17a of the movable blade 17 to contact the H-shaped steel 11 is about 0.1 second.

For this reason, according to the cutting device 10 of the present embodiment, the hole-shaped blades 16a, 17a of the fixed blade 16 and the movable blade 17 and H
The fixed blade 16 and the movable blade 17 during the contact with the section steel 11 during the transfer, that is, during most of the production time of the H section steel 11
Since the contact between the hole-shaped blades 16a, 17a and the H-shaped steel 11 is prevented, the wear, temperature rise, and furthermore, cracks (cracks) due to the temperature rise of the hole-shaped blades 16a, 17a can be completely prevented.

According to the cutting apparatus 10 of the present embodiment,
Hole-shaped knives 16a and 17a of fixed blade 16 and movable blade 17 and H-section steel
H-section steel 11
Streak flaws on the surface can be completely prevented. In particular, when the surface of the H-section steel 11 is hot-dip galvanized,
The generation of zinc flaws can be prevented, and accidents due to the clogged zinc can be prevented.

Further, most of the existing cutting devices are fixed blades.
In many cases, the hole-shaped blade 16a provided on the 16 and the hole-shaped blade 17a provided on the movable blade 17 do not exactly match. In such a case, when the H-section steel 11 is to be penetrated after cutting, the top (tip of the head) of the H-section steel 11 becomes convex and interferes with the hole-shaped blade 17a provided on the moving blade 17. Sometimes an accident occurred. However, the cutting device of the present embodiment
According to 10, since the H-section steel 11 is accurately guided, such accidents are reduced and the productivity of the H-section steel 11 is improved.

[0056]

1 is a perspective view of a cutting device according to the present invention; FIG.
With a conventional cutting device without guide rollers 21, 22, 24 and 25, 1000 tons of H-section steel with dimensions of H200 × 100 × 3.2 × 4.5 are manufactured, The amount of wear at the tip of the blade was measured.

As a result, the amount of wear of the cutting device 10 of the present invention is
Conventional cutting equipment wears 0.5m compared to 0.01mm
m, which is about 50 times the wear amount of the cutting device 10 of the present invention.
In addition, a hole-shaped cutter in which the top of the H-section steel is provided on the movable blade 17
The incidence of accidents that interfere with 17a has been significantly reduced from 10% to 2%. Thereby, the productivity of the H-section steel 11 was remarkably improved.

[0058]

[Modification] In the above description of the embodiments and examples,
Although the case where the steel material is a lightweight welded H-section steel is taken as an example, the present invention is not limited to such an embodiment, and the rolled H-section steel, lightweight C-section steel, lightweight L-section steel, channel section steel, The present invention can be equally applied to other steel shapes such as angle steel, steel pipes, and other steel materials such as steel plates. For example, when applied to a steel pipe, the guide member contacts the steel pipe during transportation,
At the time of cutting, it is installed at a position on the rear side in the moving direction of the steel pipe moving by the movement of the moving blade.

In the description of the embodiments and examples,
Although the case where the fixed blade is fixed to the fixed blade holder and the movable blade is fixed to the movable blade holder is taken as an example, the present invention is not limited to the fixed blade and the fixed form of the movable blade.

In the description of the embodiments and examples,
The case where the guide member is a pair of guide rollers is taken as an example, but the present invention is not limited to such an embodiment, and any member other than the pair of guide rollers can be equally applied as long as the member can guide a steel material.

In the description of the embodiments and examples,
Although the case where the guide roller is supported by the fixed blade holder and the movable blade holder is taken as an example, the present invention is not limited to the installation member of the guide roller.

In the description of the embodiments and examples,
Although the case where the movable blade moves obliquely downward with respect to the flange of the shaped steel to cut the shaped steel is taken as an example, the present invention is not limited to the moving direction and the moving mode of the movable blade.

Further, in the description of the embodiment and the examples, the case where the welded H-section steel is carried in a carrying posture in which the flange is in a horizontal plane is taken as an example. However, the present invention is not limited to such an embodiment, and the present invention is not limited to such a case. The same applies to the case where the sheet is conveyed while being inclined with respect to the horizontal plane.

[0064]

As described above in detail, according to the present invention, it is possible to minimize the contact between the steel material such as the welded H-section steel and the hole-shaped blade during the transfer without affecting the cutting operation of the steel material in one cycle. By suppressing or eliminating the problem, it was possible to provide a steel material cutting device capable of suppressing wear and temperature rise of the hole-shaped blade, and prolonging the life of the hole-shaped blade and suppressing scratches on the surface of the steel material. The significance of the present invention having such an effect is extremely remarkable.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a production line of a welded H-section steel provided with a cutting device of an embodiment.

FIG. 2 is a perspective view showing the cutting device of the embodiment in an exploded state.

FIG. 3 (a) is a front view schematically showing a fixed blade holder, and FIG. 3 (b) is a front view schematically showing a movable blade holder.

FIG. 4 is a partial vertical sectional view showing a positional relationship between a guide roller and a hole-shaped blade.

FIG. 5 is a sectional view of the cutting apparatus according to the embodiment taken along line AA in FIG.
It is an end elevation of a line section.

6 (a) and 6 (b) are front and side views at the time of starting cutting, and FIGS. 6 (c) and 6 (c) are explanatory views showing a situation where the H-section steel is cut by the cutting device. Fig. 6 (d)
Front view and a side view at the elapsed point cutting start after t ₁ seconds, 6 (e), and FIG. 6 (f) a front view and a side view at the elapsed point cut after the start t ₂ seconds, shown in FIG. 6 (g) and FIG. 6 (h)
Is a front view and a side view at the elapsed point cut after the start t ₃ seconds, FIG. 6 (i) is a side view at the elapsed point cut after the start t ₄ seconds, FIG. 6 (j) is cut after the start t ₅ seconds lapse FIG.

FIG. 7 shows welding H proposed by Japanese Utility Model Laid-Open No. 5-9826.
It is a perspective view which shows the cutting device of a shape steel.

[Explanation of symbols]

 10 Cutting device 11 H-section steel 16 Fixed blade 16a Drilled blade 17 Moving blade 17a Drilled blade 19 Fixed blade holder 22 Guide roller 23 Moving blade holder 24, 25 Guide roller

Claims (1)

[Claims] 1. A fixed blade having a hole-shaped blade having a shape through which a steel material to be conveyed passes, and a fixed blade having a hole-shaped blade having a shape through which the steel material passes, and being movable in a direction crossing a conveying direction of the steel material. A movable blade arranged in parallel with the fixed blade with respect to the transport direction, wherein the movable blade and / or the fixed blade are brought into contact with the steel material at the time of transport, so that the steel material and the movable blade A guide member is provided, which guides the steel material while preventing contact of the grooved blade and / or the fixed blade with the grooved blade and separates the steel material from the steel material when cutting the steel material. Steel cutting equipment.