JPH11216613A - Method and apparatus for cutting shape steel into multiple strips - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously cut a plurality of shape steels with excellent quality and high efficiency by providing a fixed blade, a plurality of movable blades lapped thereon, and a guide block to regulate the moving direction of the movable blades to be diagonally left and right downward directions to cancel the horizontal external force accompanied by the shearing reaction. SOLUTION: Movable blades 3a, 3b are arranged before a fixed blade 2 fixed to a device body in a symmetric manner in the right-to-left direction, and moved in the determined direction between the guide blocks 5a, 5b, 5c fixed to the fixed blade 2. The guide blocks are moved by depressing a knocker 6 by a ram of a cutting machine. Two shape steels 1a, 1b can be simultaneously sheared thereby. Because the diagonally cutting directions of the shape steels 1a and 1b are opposite to each other during the shearing no horizontal external force is generated and a play, etc., between the fixed blade 2 and the movable blades 3a, 3b can surely be suppressed. A cut section of excellent quality can be obtained, and the shape steels can be efficiently cut into multiple strips.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel steel, comprising a fixed blade and a movable blade having a hole shape adapted to the cross-sectional shape of a shaped steel.
The present invention relates to a multi-section cutting method and an apparatus for simultaneously cutting a plurality of section steels such as an H-section steel, an I-section steel, and a rail.

[0002]

2. Description of the Related Art In cutting a shaped steel, a fixed blade and a movable blade provided with a hole shape corresponding to the cross-sectional shape of the shaped steel are used, and the movable blade is moved obliquely downward with respect to the shaped steel, so that the shaping can be performed in a short time. A method for shearing steel is disclosed, for example, in Japanese Patent Laid-Open No. 2-262908.
JP, JP-A-2616365, JP-A-9-13
No. 6213 is disclosed. However, these cutting methods are for a single section steel, and do not relate to a multi-section cutting method for simultaneously cutting a plurality of sections.

[0003] In recent years, there are many cases in which in-line straightening and cutting systems for shaped steel are employed in recent shaped steel rolling equipment. In this case, a plurality of steel bars are straightened and cut at the same time, and the cutting method is roughly classified into a stop cutting type and a traveling cutting type. However, each of them is not a diagonal cutting method in which the movable blade is moved in an oblique direction with respect to the section steel, but is a vertical cutting method in which the movable blade is moved in a vertical direction and cut. For a section steel having two or more orthogonal surfaces such as a channel steel, an H-section steel, an I-section steel, or a rail, the following cutting method is adopted. (1) Stop cutting type This is a punching method using a cutting machine called punch cut or double cut. However, in this method, there is a problem in that the yield is low because chips with a width of about 40 mm are generated, and the quality of the cut surface is not good. (2) Travel cutting type This is a traveling cutting method using a flying shear such as a pen drum shear or a rotary shear. However, in this method, the cutting angle between the blade and the shape steel is not 90 °,
In addition, since it oscillates by several degrees, the squareness of the cut surface does not come out, so that there is a problem that post-processing such as recut is required.

[0004]

The oblique cutting (oblique cutting) method using a fixed blade and a movable blade having a hole shape has a higher quality and efficiency of a cut surface than the above-mentioned punching method and cutting method using a flying shear. It is considered excellent in terms of aspect. However, when this method is used for multi-section cutting of shaped steel, if the moving direction of each moving blade is parallel to the oblique direction as generally considered, the horizontal component of the shear reaction force accumulates, so The quality of the cut surface is deteriorated due to play between the blades.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a shaped steel which is capable of simultaneously cutting a plurality of shaped steels with high quality and high efficiency by offsetting a horizontal external force accompanying a shear reaction force. It is an object to provide a multi-section cutting method and an apparatus therefor.

[0006]

According to the present invention, there is provided a multi-section cutting method for a shaped steel using a fixed blade and a plurality of movable blades, wherein the plurality of movable blades are moved obliquely with respect to each shaped steel. A cutting method for simultaneously shearing a plurality of shaped steel,
The moving direction of the plurality of moving blades is divided into a diagonally lower left direction and a diagonally lower right direction. Preferably, the fixed blade has a plurality of holes corresponding to the cross-sectional shape of the shaped steel, and each movable blade has the same hole shape as the fixed blade.

Further, the multi-section cutting device for a shaped steel according to the present invention is characterized in that a fixed blade, a plurality of movable blades superposed on the fixed blade, and a moving direction of the plurality of movable blades are obliquely downward and leftward. And a guide block for regulating the diagonally downward right direction. In this case, in the case of simultaneous cutting of an even number of section steels, a plurality of moving blades are arranged symmetrically. Also, regardless of whether the number of shaped steel is even or odd,
Among the plurality of moving blades, the left half group is arranged so that the moving direction is parallel to the diagonally lower left direction, and the right half group is arranged so that the moving direction is parallel to the diagonally lower right direction.

The present invention is characterized in that a plurality of moving blades are arranged such that the moving direction of the moving blade (the oblique cutting direction of the shaped steel) becomes a letter "C". According to common sense, the arrangement is in the shape of a "river", but the external force acting on the shearing blade (fixed blade and moving blade) greatly differs due to the difference in these arrangements. This will be described with reference to FIG. FIG. 7A shows a case where the character “K” is obliquely cut, and FIG. 7B shows a case where the character “C” is obliquely cut. In the drawing, reference numerals 1a and 1b denote shaped steel members to be cut, 2 denotes a fixed blade having holes 2a and 2b, and 3a and 3b denote moving blades having holes 4a and 4b, respectively.

In FIG. 5, in the case of the oblique cutting of a “river” shown in FIG. 5A, the force P required to shear the section steels 1 a and 1 b is shown.
Reaction forces P1 'and P2' are generated on the fixed blade 2 via the shape steels 1a and 1b by the same amount as 1 and P2. Horizontal component forces P1 ″, P2 ″ generated by the reaction forces P1 ′, P2 ′.
Is given by θc Thus, the sum of the horizontal component forces acts on the shearing blade as the external force F in the horizontal direction. On the other hand, in the case of the "C" -shaped oblique cutting shown in (b), the action and the reaction of the force are the same as in the case of the "river" -shaped oblique cutting, but the sectional shapes 1a and 1b
The horizontal component P1 ″ and P
2 "cancel each other and P1" + P2 "= 0. That is, no horizontal external force F is generated on the shearing blade.

The relationship between the external force F and the number of cuts n is as follows. F-shaped cross section of river C-shaped cross section of F C = 2 · P · cos θc F = 0 3 F = 3 · P · cos θc F = P · cos θc n F = n · P Cos θc F = 0 or P · cos θc As described above, in the case of a “river”, the external force F is proportional to the number n of cuts. On the other hand, in the case of the oblique cutting of the character “C”, the dividing method is n / 2 + n / 2 or (n−1) / 2 + [(n−
1) / 2 + 1], and if n is an even number, the external force F
Is zero, even if it is an odd number, regardless of the number n of cuts, the external force F has the maximum force of P · cos θc for only one.

By the way, in the example of simultaneous cutting of two 200.times.90 channel steels, supposing that the oblique angle .theta.c = 45.degree. "Kan" character diagonal "C" character diagonal P1 = P2 200TON 200TON P1 '= P2' 200TON 200TON P1 "141.4TON 141.4TON P2" = P1 "= -P1" F = P1 "+ P2" 282 ．4TON 0 In other words, in the case of a “river”, the shearing blade is firmly fixed so that there is no deviation from the horizontal force of up to 70% of the shearing force.
It is necessary to hold. If looseness occurs due to looseness or the like, good cutting cannot be maintained. On the other hand, in the case of the "C" -shaped oblique cutting, if the horizontal force is zero or 70% of the oblique cutting force of one maximum, the shearing blade should be fixed and held so that no deviation occurs. Good, easy to design,
There are few problems in fixing and holding, and the quality of the cut surface can be kept high.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view partially showing the outline of a multi-row cutting device of the present invention, and FIG. 2 is a front view. Here, a multi-section cutting device for two channel steels is illustrated. 1 and 2, reference numerals 1a and 1b denote shaped steel members to be cut, which are inserted into the cutting device in parallel in a normal posture. Reference numeral 2 denotes a fixed blade, which has a hole shape 2 according to the cross-sectional shape of the shaped steel.
a, 2b are provided. Reference numerals 3a and 3b denote moving blades, which have hole shapes 4a and 4b having the same shape and dimensions as the hole shapes 2a and 2b of the fixed blade 2, respectively. The left moving blade 3a is obliquely downward to the left and the right moving blade 3b Moves in the diagonally lower right direction. Reference numerals 5a, 5b, and 5c denote guide blocks that regulate the moving direction of the movable blades 4a and 4b. Reference numeral 6 denotes a knocker for moving the movable blades 3a and 3b, which is simultaneously pushed down by, for example, a ram (not shown) of a cutting machine.

The fixed blade 2 is fixed to an apparatus body (not shown). The movable blades 3a and 3b are symmetrically arranged on the front surface of the fixed blade 2 and move in a predetermined direction between a plurality of guide blocks 5 fixed to the fixed blade 2 respectively. This movement is performed by pushing down the knocker 6 by the ram of the cutting machine. As a result, the two section steels 1a, 1
b can be sheared simultaneously. Further, since no horizontal external force F is generated at the time of shearing as described above, rattling between the fixed blade 2 and the movable blades 3a and 3b can be easily and reliably suppressed, so that a high quality cut surface can be obtained. Multi-section cutting of a section steel can be performed efficiently.

FIG. 3 shows an example of the arrangement of the shearing blades for three section steels, and FIG. 4 shows an example of the arrangement of the four blades. When the shaped steel 1a, 1b, 1c of the material to be cut is an odd number, as shown in FIG. 3, the moving direction of one of the moving blades 3a, 3b (for example, the left side) is parallel to the diagonally lower left direction. The right movable blade 3c is regulated by the guide blocks 5c, 5d so as to move obliquely downward to the right similarly to FIG. Therefore, in this case, as the horizontal external force on the shearing blade, the oblique shearing force on the left one section steel 1a may be considered. Shaped steel 1a, 1
When b, 1c, and 1d are even numbers, the movable blades 3a, 3b, 3c, and 3d are arranged in a symmetric “C” shape as shown in FIG. That is, the right movable blade 3a and the left movable blade 3b are set so that the moving direction is parallel to the diagonally lower left direction.
The guide blocks 5a, 5b, 5c, 5d, and 5e are provided so that the set of c and 3d is parallel to the diagonally lower right direction. In this case, no horizontal external force is generated on the shearing blade.

Although the movable blades can be arranged in a horizontal "C" shape, the width of the blades is increased.
There is a disadvantage that the entire device becomes larger.

[0016]

As described above, according to the present invention,
Using a fixed blade and a plurality of moving blades, the moving direction of each moving blade is divided into a diagonally lower left direction and a diagonally lower right direction to simultaneously shear a plurality of shaped steels, so it works on shearing blades. Horizontal external force can be canceled out, and loosening and play between the shearing blades can be easily and surely suppressed, so that multi-section cutting of a shaped steel can be performed with high quality and high efficiency.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of a multiple cutting device of the present invention.

FIG. 2 is a front view of FIG. 2;

FIG. 3 is a front view showing an example of the arrangement of shearing blades on three section steels.

FIG. 4 is a front view showing an example of the arrangement of shearing blades on four section steels.

FIG. 5 is an explanatory diagram showing a difference in acting force due to a difference in arrangement of shearing blades.

[Explanation of symbols]

 1a, 1b, 1c, 1d Shaped steel 2 Fixed blade 2a, 2b, 2c, 2d Fixed blade hole shape 3a, 3b, 3c, 3d Moving blade 4a, 4b, 4c, 4d Hole shape of each moving blade 5a, 5b, 5c, 5d, 5e Guide block 6 Knocker

Claims (4)

[Claims] 1. A cutting method for simultaneously shearing a plurality of shaped steels by using a fixed blade and a plurality of movable blades and moving the plurality of movable blades in an oblique direction with respect to each of the shaped steels, A multi-section cutting method for a shaped steel, wherein a moving direction of a plurality of moving blades is divided into a diagonally lower left direction and a diagonally lower right direction. 2. A fixed blade having a plurality of holes according to a cross-sectional shape of a shaped steel, a plurality of moving blades superimposed on the fixed blade, and a moving direction of the plurality of moving blades in a diagonally downward left direction. A multi-section cutting device for shaped steel, comprising: 3. The multi-section cutting device for section steel according to claim 2, wherein said plurality of movable blades are arranged symmetrically. 4. A set of a left half of the plurality of movable blades is in a diagonally lower left direction in which the moving directions are parallel, and a set of the right half is in a diagonally lower right direction in which the movement directions are parallel. 3. The multi-section cutting device for a shaped steel according to claim 2, wherein the device is arranged in a section.