JP3923719B2 - Angled cutting edge of steel square pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oblique cutting blade of a steel square pipe , and more particularly to an oblique cutting blade of a steel square pipe that can obtain a clean cut surface even with a square plate having a thin plate structure.
[0002]
[Prior art]
Conventionally, when cutting steel, gas cutters, high-speed cutters equipped with rotary blades, and the like are used.
Since the gas cutting machine blows off the melted portion using high temperature and cuts it, no noise is produced, but the cut end is not clean.
In addition, since the high-speed cutter cuts with a disk-shaped blade, the cutting surface itself is somewhat clean, but has qualities such as burrs attached to the edges and severe noise caused by high metal sounds.
[0003]
[Problems to be solved by the invention]
In recent years, the use of lightweight steel frames has increased, and in the construction of houses, the use of lightweight steel frames has increased, and lightweight steel square pipes and the like are often employed.
By the way, there are places where the end face is obliquely cut and assembled in a house hut set or the like, and it is necessary to cut the end face diagonally even when using a steel square pipe.
When cutting the end face of this steel square pipe obliquely, there are the gas cutting machine and the high-speed cutter, but in the state of cutting first, the cutting site is not clean, and it requires re-care, which increases costs. High-speed cutters have problems such as noise pollution. Further, there is a problem that automation with a simple structure is difficult and cannot be used efficiently.
[0004]
The present invention has been made to solve this conventional problem, and the object of the present invention is to obtain a clean cut surface and dimensions, which can be used for assembly as they are, and generates dust and noise. An object of the present invention is to provide a steel square pipe oblique cutting blade which can perform clean and safe work without being cut and can be automated up to cutting with a simple structure.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the oblique cutting blade of the steel square pipe according to claim 1 of the present invention, an end of the steel square pipe is obliquely cut from the inside with respect to the axis thereof, and the fixed blade and the movable blade are cut out. A steel square pipe is inserted diagonally so that it opens in the sliding surface with the moving blade and the three outer sides of the pipe are fitted together and only the three surfaces protrude from the sliding surface. The fixed blade having a cut opening and a sliding surface edge of the fixed blade serve as a blade portion to form a substantially flat plate body, and the flat plate body is projected from the sliding surface of the fixed blade in plan view. A first blade portion which is formed narrower than the inner width of the two parallel surfaces, the tip edge is concave in the anti-sliding direction and both ends are sharp, and the first blade portion is arranged at the tip in the sliding direction, and the sharp portions at both ends A second blade portion that is continuous with each other and gradually expands until the edges become close to the inner width of the two parallel surfaces, and the second blade Wherein the gradual movement blade and a third blade unit comprising a greater width than the opening width of the continuous cut plane, in that it consists of.
[0006]
In the diagonal cutting blade of the steel square pipe according to claim 2, in the diagonal cutting blade of the steel square pipe according to claim 1, the third blade portion is formed in an arc shape in a state in which the arc is in contact with the end of the second blade portion. It is characterized by being.
[0007]
In the diagonal cutting blade of the steel square pipe according to claim 3, in the diagonal cutting blade of the steel square pipe according to claim 1 or 2, the concave portion of the tip edge of the first blade portion is formed in an arc shape. It is characterized by being.
[0008]
The steel square pipe oblique cutting blade according to claim 4, wherein both ends of the first blade portion are flat plates in the diagonal cutting blade of the steel square pipe according to claim 1. It is characterized by having a slight thickness in the thickness direction of the body.
[0009]
[Action and effect]
In the steel square pipe oblique cutting apparatus to which the present invention is applied , the cutting edge of the fixed blade is opened on the sliding surface. The rear blade portion of the movable blade, that is, the third blade portion has a portion that becomes gradually wider than the cutting port. At the time of cutting work, when the steel square pipe is inserted into the cutting port until its end surface comes into contact with the stopper, the steel square pipe is in a state in which only the three surfaces of the end surface portion protrude from the cutting port to the sliding surface. . That is, the two parallel surfaces of the protruding portion are triangular. In the projecting state, the movable blade is slid from the non-projecting side of the steel square pipe.
The moving blade starts to slide, that is, the first blade and the second blade are narrower than the two parallel surfaces, so that they pass as they are. At first, the rear third blade contacts the inner surface of the two parallel surfaces. Touch. In this portion, the sliding surface of the moving blade gradually overlaps the sliding surface around the cutting opening, so that the protruding side of the steel square pipe is cut by receiving a shearing force from the protruding start side.
As the moving blade advances, the leading edge portion of the moving blade, that is, the sharpened portions at both ends of the first blade portion, come into contact with the opposing surface to start cutting, and the cutting line moves to the second blade portion, and finally parallel. By cutting the cutting lines on the two surfaces side, three surfaces are cut off.
When the length of the two parallel surfaces protruding from the sliding surface is longer than the length from the first blade portion to the third blade portion, the third blade portion starts to cut the parallel two surfaces first, The first blade portion starts to cut the opposing surface and the cutting line moves to the second blade portion. When the length of the parallel two surfaces is shorter than the length from the first blade portion to the third blade portion, first, The blade portion starts to cut from the facing surface.
[0010]
Therefore, in the steel square pipe oblique cutting apparatus and the oblique cutting blade to which the present invention is applied, a clean cut surface can be obtained because the cutting is performed by the shearing force of the fixed blade and the moving blade. Since the cutting site is firmly held at the cutting port, the thin plate structure can be cut without being deformed.
Since cutting is performed by sequentially moving the shearing position, dust and noise are not generated, and it is clean and safe, and since it can be cut with a small horsepower, it is economical and the apparatus can be downsized.
[0011]
In the oblique cutting apparatus for steel square pipe to which the present invention is applied , it can be arranged in the movable blade without causing the stopper tip to interfere within the clearance groove. Thus, when the stopper tip is arranged near the shear port, the end face of the steel square pipe has a small amount of protrusion from the cut port.
[0012]
Therefore, in the present invention, when the moving blade is slid for cutting, interference can be avoided by the escape groove even if the stopper tip is provided so as to overlap the inside of the moving blade. Can be increased.
Moreover, since the protrusion amount from the cutting opening of the steel square pipe end face can be restricted to a small amount, it is possible to obtain an effect such as being able to cut accurately corresponding to a small amount.
[0013]
In the steel square pipe oblique cutting apparatus to which the present invention is applied, the angle at which the end face of the steel square pipe is cut is accurately set by arranging the steel square pipe on the cradle. It is fixed in that state.
[0014]
Therefore, in the present invention, accurate cutting can be performed safely and easily even by manual work. By changing the cradle and the fixing means having different angles, it is possible to obtain an effect that a plurality of members obliquely cut at various angles can be easily and accurately provided.
[0015]
In the oblique cutting apparatus for steel square pipes to which the present invention is applied, when the fixing means fixes the steel square pipe supplied on the cradle to the cradle, the sensor detects this and drives the driving means. Cuts the portion protruding from the cutting opening by sliding on the sliding surface of the fixed blade.
Therefore, in the present invention, since the steel square pipe is automatically fixed and cut, an effect is obtained that a safe operation and accurate and uniform cutting can be performed without being an expert.
[0016]
In the oblique cutting blade of the steel square pipe according to claim 2 of the present invention, the third blade portion for cutting the two parallel surfaces is formed in a concave arc shape in the sliding direction. Bent outward along an arc.
Therefore, in the present invention, there is an effect that the chip can perform a beautiful cutting without disturbing the cutting portion.
[0017]
In the diagonal cutting blade of the steel square pipe according to the third aspect of the present invention, the opposing surface starts to be cut from the sharpened portions at both ends, and is cut by shifting the time so as to come closer to the center from both sides and match.
Therefore, in the present invention, it is possible to obtain a beautiful cut surface without deformation without applying a large force that deforms the steel square pipe by simultaneous cutting.
[0018]
In the oblique cutting edge of the steel square pipe according to claim 4 of the present invention, when cutting the facing surface, only the sharp point with a narrow width is first sheared, and then the cutting position shifts to the curved surface portion.
Therefore, in the present invention, the thickness direction of the moving blade at the beginning of the cutting of the opposing surface cuts only the portion close to the cutting opening, so that the force at the time of cutting may be small, and the cutting of the cutting surface may be performed. The effect that a clean cut surface can be obtained without deforming the first part is obtained.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side sectional view showing a steel square pipe oblique cutting apparatus according to the present embodiment, FIG. 2 is a rear view thereof, FIG. 3 is a side side detail view of a cutting portion, and FIG. 4 is a rear side detail view thereof. 5A is a front view showing the fixed blade, FIG. 5B is a cross-sectional view taken along the line AA in FIG. 5, FIG. 5C is a cross-sectional view taken along the line BB in FIG. The rear view to show, (B) is the front view, (C) is sectional drawing by the AA line of the same figure.
First, in FIGS. 1 and 2, 1 is a base of the apparatus, 2 is a fixing portion, 3 is a cutting portion, and 4 is a stopper.
[0020]
The fixing portion 2 fixes the steel square pipe 5 to the cutting portion 3, and includes a cradle 6 on which the steel square pipe 5 is placed, an air cylinder 7 and a press plate 8 attached to the rod. And fixing means. The cradle 6 is fixed horizontally with respect to the base 1 so that the operator can perform the apparatus manually.
Reference numeral 8a denotes a limit switch as a sensor that emits a signal when the presser plate 8 is lowered and the steel square pipe 5 having a predetermined size is pressed.
[0021]
As shown in FIGS. 3 and 4, the cutting portion 3 is for obliquely cutting the end surface portion of the steel square pipe 5, and at a predetermined angle with respect to the cradle 6 at the front surface side position of the fixing portion 2. It comprises a bracket 9 attached at an inclination, a fixed blade 10 fixed to the bracket 9, a movable blade 11 slidably mounted, and a hydraulic cylinder 12 as a driving means for the movable blade 11.
[0022]
As shown in FIG. 5, the fixed blade 10 is formed in a substantially rectangular flat plate shape, and a sliding surface 13 with the moving blade 11 is provided one step higher on the front side. A cutting opening 14 is formed in a rectangular shape at the center of the sliding surface 13.
In the cutting port 14, the long side 15 has a length that allows the steel square pipe 5 to be inserted in an inclined state, and the short side 16 includes both long sides 5 a and 5 a of the steel square pipe 5. The side short side 5b has a length for fitting, and the sliding surface side edge is 90 degrees on the left and right long sides 15 and 15, and the upper and lower short sides 16 and 16 are smaller than the inclination of the steel square pipe 5. It is provided as follows.
In the figure, reference numeral 17 denotes an enlarged portion that is chamfered so as to be easily inserted when the steel square pipe 5 is inserted into the cutting opening 14.
[0023]
As shown in FIG. 6, the movable blade 11 is formed in a substantially flat plate 11 a with the edge of the sliding surface 18 with the fixed blade 10 as a blade, and a first blade portion 19 and a second blade portion 20. The third blade portion 21 is included.
The first blade portion 19 is formed to be narrower and narrower than the inner width of the parallel two surfaces 5c and 5c at the end surface portion of the steel square pipe protruding from the sliding surface 13 of the fixed blade 10 when the flat plate 11a is viewed from the front. The curved portion 22 is concave in the anti-sliding direction, and the sharpened portion 23 is sharpened at both ends. The curved portion 22 and the sharpened portion 23 are formed to have a slight thickness 11b in the thickness direction of the flat plate 11a.
The second blade portion 20 is arranged with the first blade portion 19 at the tip in the sliding direction and is continuous with the sharpened portions 23 at both ends, and the edges 24 are close to the inner width of the parallel two surfaces 5c and 5c. It is formed so as to gradually expand up to.
The third blade portion 21 is a circle in a state where an arc is in contact with the end of the edge 24 of the second blade portion so as to be gradually larger than the opening width of the cutting opening 14, that is, the length of the short side 16. An arc 25 is formed. In the present embodiment, the length from the first blade portion 19 to the third blade portion 21 is shorter than the length of two parallel surfaces protruding from the sliding surface.
Reference numeral 26 denotes a relief groove, which is provided with a depth to avoid interference with a tip end portion of a stopper 4 which will be described later when moving up and down.
[0024]
The stopper 4 regulates the protruding amount of the steel square pipe end face portion from the cutting opening 14 to a specified value, and is a bracket disposed on the front side of the cutting section 3 with the tip portion facing the cutting opening side. 27 is attached so that it can be moved forward and backward. Reference numeral 28 denotes a protrusion amount adjusting unit.
[0025]
3 and 4, reference numeral 29 denotes a back plate, which is fixed to the base 1 with an interval at which the movable blade 11 slides with respect to the fixed blade 10. Reference numeral 30 denotes a distance adjusting bolt.
31 is a mounting seat for mounting the movable blade 11 on the rod of the hydraulic cylinder 12, 32 is the same mounting bolt, and 33 is the same bolt hole. Reference numeral 34 is a chute discharging chute.
[0026]
Next, the function and effect will be described.
At the time of cutting work, when the steel square pipe 5 placed on the cradle 6 is inserted into the cutting port 14 until the end face of the steel pipe 5 comes into contact with the stopper 4 in an inclined state, the steel square pipe 5 moves against the sliding surface 13. Only the three surfaces 5c, 5c, and 5d of the end surface portion are protruded. That is, the parallel two surfaces 5c and 5c of the protruding portion are triangular.
In a state where the steel square pipe 5 is properly set, the air cylinder 7 is operated by a foot switch (not shown), and is pressed and fixed by the presser plate 8 at the tip.
When the steel square pipe 5 is pressed, the hydraulic cylinder 12 is actuated by a signal from the limit switch 8a. The hydraulic cylinder 12 slides the movable blade 11 above the cutting port 14, that is, from the non-projecting side of the steel square pipe 5.
[0027]
Since the first blade portion 19 and the second blade portion 20 are narrower than the distance between the parallel two surfaces 5c and 5c, the first blade portion 19 and the second blade portion 20 pass as they are. 21 abuts on the first inner surface of the two parallel surfaces. In this portion, the sliding surface 18 of the moving blade 11 gradually overlaps the sliding surface 13 around the cutting opening, so that the protruding side of the steel square pipe 5 is cut by receiving a shearing force from the protruding start side.
At this time, since the third blade portion 21 has a concave arc shape 25 in the sliding direction, when cutting is started, the cut portion is continuously bent outward along the arc.
As the moving blade 11 advances, the tip of the moving blade 11, that is, the sharpened ends 23, 23 of the first blade portion 19, come into contact with the opposing surface 5d to start cutting. This cutting line moves to the second blade portion 20, and finally, the cutting lines on the parallel two surfaces side are continuous, so that the three surfaces 5c, 5c, and 5d are cut out, and the chips are externally removed by the chute 34. Discharged.
[0028]
As described above, the steel square pipe oblique cutting device of the present embodiment has the following effects.
(1) Since the cutting is performed by the shearing force of the fixed blade 10 and the movable blade 11, a beautiful cut surface can be obtained. Since the cutting site is firmly held by the cutting port 14, the thin plate structure can be cut without being deformed.
(2) Since the cutting is performed by sequentially moving the shearing position, dust and noise are not generated, it is clean and safe, and since it can be cut with a small horsepower, it is economical and the apparatus can be downsized.
(3) When the movable blade 11 is slid for cutting, interference can be avoided by the escape groove 26 even if the tip of the stopper 4 is provided so as to overlap the inside of the movable blade. it can. Moreover, since the protrusion amount from the cutting opening of the steel square pipe 5 can be restricted to a small amount, it can be accurately cut corresponding to a small amount.
(4) Accurate cutting can be performed safely and easily even with manual work. By using the cradle 6 and the pressing plate 8 having different angles, a plurality of members obliquely cut at various angles can be provided easily and accurately.
(5) Since the steel square pipe 5 is automatically fixed and cut, a safe operation and accurate and uniform cutting can be performed without being an expert.
(6) The chip can be cut cleanly without disturbing the cut portion.
(7) Since one side is not cut simultaneously, a large force that deforms the steel square pipe 5 is not applied, and a clean cut surface without deformation can be obtained.
(8) The thickness 11b of the movable blade 11 is small at the beginning of the cutting of the facing surface 5d, and only the portion close to the cutting opening is cut. Therefore, the force at the time of cutting may be small, and the cutting start portion of the cutting surface A beautiful cut surface can be obtained without deforming.
[0029]
Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the scope of the invention, Included in the invention.
For example, in the present embodiment, the bracket 9 of the cutting portion has been described as being fixed to the base 1, but the bracket 9 can be provided to the base 1 so that the angle can be changed, and the oblique cutting angle can be changed.
Although the sensor uses a limit switch, a pressure sensor, a photoelectric sensor, or the like can also be used.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a side surface of an oblique cutting apparatus for a steel square pipe according to an embodiment of the present invention.
FIG. 2 is a rear view showing an oblique cutting device for a steel square pipe according to an embodiment.
FIG. 3 is a detailed view showing a side surface side of the cutting part according to the embodiment.
FIG. 4 is a detailed view showing a back side of the cutting unit according to the embodiment.
5A is a front view showing a fixed blade, FIG. 5B is a cross-sectional view taken along line AA in FIG. 5, and FIG. 5C is a cross-sectional view taken along line BB in FIG.
6A is a rear view showing a moving blade, FIG. 6B is a front view thereof, and FIG. 6C is a sectional view taken along line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base 4 Stopper 5 Steel square pipe 5c Two parallel surfaces 5d of a steel square pipe The surface where the moving blade of a steel square pipe opposes 6 Base 8 Holding plate (fixing means)
8a Limit switch (sensor)
10 fixed blade 11 moving blade 12 hydraulic cylinder (drive means)
13 Sliding surface of fixed blade 14 Cutting port 18 Sliding surface of moving blade 19 First blade portion 20 Second blade portion 21 Third blade portion 22 Curved portion 23 of first blade portion Sharpened portion 25 of first blade portion First Arc shape 26 of 3 blade part Relief groove

Claims (4)

It is a combination of a fixed blade and a movable blade that cuts the end of a steel square pipe obliquely with respect to its axis from the inside and cuts three surfaces,
A cutting opening through which a steel square pipe is inserted obliquely so as to open in the sliding surface with the moving blade and bring the three outer sides of the pipe into a fitted state and to project only the three surfaces from the sliding surface. A fixed blade having,
The edge of the sliding surface with the fixed blade is used as a blade portion to form a substantially flat plate, and the flat plate is viewed in plan and narrower than the inner width of two parallel surfaces protruding from the sliding surface of the fixed blade. A first blade portion whose tip edge is concave in the anti-sliding direction and whose both ends are sharp, and the first blade portion is arranged at the tip in the sliding direction and is continuous with the sharp portions at both ends, and the edges are parallel to the two surfaces. And a moving blade comprising a second blade portion that gradually expands until approaching the inner width thereof, and a third blade portion that is continuous with the second blade portion and that is gradually larger than the opening width of the cutting surface. Diagonal cutting blade of steel square pipe.   2. The oblique cutting blade for a steel square pipe according to claim 1, wherein the third blade portion is formed in an arc shape in a state where an arc is in contact with the end of the second blade portion.   The diagonal cutting blade of the steel square pipe according to claim 1 or 2, wherein a central concave portion of the first blade portion is formed in an arc shape.   4. The steel product according to claim 1, wherein the sharpened portions at both ends of the first blade portion are formed to have a slight thickness in the thickness direction of the flat plate body. Diagonal cutting blade for square pipe.

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