JP2004209555A - Apparatus for cutting off square pipe material, and cutting-off method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for cutting off a square pipe material and a cutting-off method using the same, which apparatus has an upper blade, which does not require to open a hole on the tip end of the blade thickness and on which chips do not stick, and does not require a mechanism for clamping the square pipe. <P>SOLUTION: The apparatus 10 for cutting off the square pipe material W comprises a pair of fixed blades 15 for fixing the square pipe material W such that the corner of the square pipe material W directs downward, and a movable blade 16 for cutting off the square pipe material W by being inserted into the gap between a pair of the fixed blades 15. A pair of the fixed blades 15 have an aperture portion 15a, which has the height higher than that of the diagonal c of the square pipe material so as to insert the square pipe material W thereinto and has a shape similar to that of a leaf of a ginkgo tree. The movable blade 16 has an obtuse angled V shape cutting edge arranged at a central portion thereof leaving tilting cutting edge portions 16a, 16a of the movable blade 16 and making approximately concave right and left movable cutting edges 16b, 16b extend downward so as to correspond to the width of the diagonal c of the square pipe material. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cutting device for a square pipe material including a pair of fixed blades for fixing a square pipe material, and a movable blade for cutting the square pipe material by entering between the two fixed blades, and a cutting method using the same.
[0002]
[Prior art]
As a cutting device for a square pipe material, a press cutting device 70 for a square pipe material is known (see, for example, Patent Document 1). FIG. 7 is a perspective view showing the main part of this prior art as a partial cross section. As shown in FIG. 7, the square pipe member 71 is sandwiched between constraining half blade portions 72a, 72b and 73a, 73b that are located opposite to each other. These constraining half blades sandwich the square pipe material 71 from the respective diagonal directions. Then, the upper blade 74 descends between both the restricting blades 72, 73 and cuts the square pipe material 71. The upper blade 74 has a cutting edge 75 that is tapered toward the lower side, and the cutting edge 75 has a taper angle θ of about 10 to 30 ° with respect to the horizontal plane.
[0003]
At the tip of the cutting edge 75 formed on the upper blade 74, an upward circular hole 76 having a diameter of 1/2 or more of the blade thickness is provided at the center portion in the blade thickness direction. The round hole 76 is a through hole or a blind hole that penetrates to the upper surface of the cutting upper blade 74, and the round hole 76 ensures that the chips are bitten and smooth.
[0004]
[Patent Document 1]
JP 2002-46094 A (FIG. 1)
[0005]
[Problems to be solved by the invention]
However, when making a round hole at the tip of a blade thickness of about 2.5 to 4 mm, the place where the hole is made is just the corner of the upper blade 74, and the hole diameter is as thin as φ1.5 to 2.5 mm, so that drilling is possible. There was a problem that it was not easy.
Further, the upper blade 74 with a hole has a problem that the chips bite into and adhere to the round hole 76 and do not fall from the upper blade 74, and the chips must be peeled off one by one. Further, since the square pipe material 71 is clamped or released from the left and right diagonal directions, it is necessary to move the constraining half blades in the left and right directions, and there is a problem that the apparatus becomes complicated.
[0006]
Therefore, the present invention was devised to solve such a conventional problem, and it is not necessary to make a hole at the tip of the blade thickness, and has an upper blade to which chips do not adhere, It is an object of the present invention to provide a square pipe member cutting device that does not require a clamping mechanism and a cutting method using the same.
[0007]
[Means for Solving the Problems]
The present invention described in claim 1 includes a pair of fixed blades that fix the corner pipe material with its corners facing downward, and a movable blade that cuts the square pipe material by entering between the pair of fixed blades. In the square pipe member cutting device, the pair of fixed blades have substantially ginkgo-shaped openings that are higher than the diagonal line height of the square pipe member to insert the square pipe member, and the movable blade is The obtuse V-shaped cutting blade is arranged in the center, the movable blade at the tip is left in accordance with the width of the diagonal line of the square pipe material, and the left and right movable blades are extended downward in a substantially concave shape. To do.
[0008]
According to the first aspect of the present invention, the pair of fixed blades are generated on the back side of the corner of the cut surface by providing the substantially canopy-shaped opening portion raised in accordance with the outer diameter of the diagonal line of the square pipe material. It is possible to prevent the occurrence of burrs and burrs. In addition, the provision of the substantially ginkgo-shaped opening makes it easy to insert the square pipe material. Furthermore, the tip of the movable blade having an obtuse angle shape at the center leaves the movable blade at the tip according to the width to the left and right corners of the square pipe material, and the left and right movable blades are extended downward to form a substantially concave shape. Therefore, there is no need to make a hole at the tip of the blade thickness, a step portion can be provided so that chips do not adhere, and a square pipe material cutting device that does not require a clamp mechanism for the square pipe material is provided. Can do. In order to form a substantially concave shape, the left and right movable blades may not be extended, but the movable blade at the tip may be pushed upward and retracted.
[0009]
Invention of Claim 2 is a cutting device of the square pipe material of Claim 1, Comprising: The lower blade edge | tip shape of the said movable blade is the lower blade edge | tip formed with the obtuse angle 125-145 degrees from the center to the right-and-left object. An obtuse angle of 95 to 119 ° with a width of 2 to 4 mm is formed as a biting portion in the most advanced portion of the above.
[0010]
According to the invention described in claim 2, an obtuse angle of 95 to 119 ° with a width of 2 to 4 mm as a chamfered portion at the most advanced portion of the lower cutting edge formed at an obtuse angle of 125 to 145 ° which is a V-shaped cutting edge. As a result, the chip bites into the top of the square pipe material, and the subsequent cutting is finished, and at the same time it is bounced downward and dropped, so automation is possible and the life of the movable blade is extended. Can do.
[0011]
Invention of Claim 3 is a cutting device of the square pipe material of Claim 1 or Claim 2, Comprising: As for the front-end | tip part shape of the lower blade edge | tip of the said movable blade, the said biting part is formed in the center. Then, an obtuse angle of 130 to 140 ° is formed, and the inclined blade surface is matched to the diagonal line width of the square pipe material so as to be substantially concave. 3 to 7R are formed at the corners to be formed.
[0012]
According to the third aspect of the present invention, it is possible to provide a 3-7R corner portion at the corner portion to be formed and the step portion formed by returning from the inclined blade surface having an obtuse angle of 130 to 140 ° to 240 to 260 °. Therefore, the adhered chips collide with the R-shaped corner portion of the stepped portion of the movable blade, and the entire length of the chips is compressed by this impact, deformed into a U shape or a V shape, and is pushed downward. Can be dropped. As a result, there is no adhesion of chips to the movable blade, so that an automated operation can be performed.
[0013]
The invention according to claim 4 is a cutting method using the cutting device for the square pipe material, wherein the square pipe material is inserted into the substantially ginkgo-shaped opening with the corner of the square pipe material being directly below, and the end surface is A first step of determining the length of the square pipe material by contacting the stopper, a second step of cutting the square pipe material by inserting a substantially concave movable blade between a pair of fixed blades, and the substantially concave movable blade And a third step of finally removing chips by the corner R of the step portion.
[0014]
According to the fourth aspect of the present invention, the square pipe material is inserted into the opening that is raised by pressing the gap according to the outer diameter of the diagonal line of the square pipe material, the position is determined, and the movable blade is moved downward. In addition, since the R portions at the left and right ends of the generated chips are positively applied to the stepped portion provided in the substantially concave corner of the movable blade, no chipping occurs and the chips adhere to the movable blade. It is possible to provide a cutting method using a square pipe material cutting device that can be dropped and automatically operated.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a power press 1 equipped with a cutting device 10 for a square pipe material of the present invention. As shown in FIG. 1, for example, a 10 ton class press is sufficient for cutting a pipe material having a 40 mm square, a plate thickness of 1.4 mm, and a corner R2.5. This press machine is a hydraulic type, but may be other types, for example, a mechanical press machine using a crank, a link, a cam, or a manually operated manual press machine.
A square pipe material cutting device 10 is installed on the table 2 of the power press 1 by bolts, and an operation panel 6 is disposed in front of the table 2. Further, a foot switch 7 is disposed in the vicinity of the right side of the power press 1, and an emergency stop button 7c is provided in accordance with the waist height as a safety measure.
[0016]
A hydraulic device 3 is housed in a space behind the power press 1 and a high-pressure hose is piped to a high-pressure cylinder 4 (not shown) through a solenoid valve. Pressure oil generated by the motor and pump of the hydraulic device 3 is pumped to the high-pressure cylinder 4, and a piston (not shown) is lowered by the pumped pressure oil. The pipe member (not shown) is cut into a predetermined length by cooperating with the fixed blade 15 by abutting against the buffer member 18 placed on the top 12 and pressing down as it is to push down the movable blade 16.
[0017]
FIG. 2 is an enlarged perspective view of the square pipe member cutting apparatus 10 of the present invention.
As shown in FIG. 2, the square pipe member cutting apparatus 10 is composed of a base 11 and a top 12, and posts 13 and 14 that serve as pillars and guides arranged at four corners, a fixed blade 15, and a movable blade 16. ing.
The base 11 is fixed on the table 2 of the power press 1 by a fixing tool (not shown).
The top 12 has a shock-absorbing member 18 that is a punch head that directly contacts the tip surface of the cylinder of the power press 1, and a movable blade 16 is held on the lower surface of the top 12.
The posts 13, 13, 14, 14 are pivotally supported by ball bushes 19, 19... (See FIG. 3A), and can move up and down. Each post 13, 14 is provided with springs 23, 24, which are constantly urged upward by the urging force of the springs 23, 23, 24, 24.
[0018]
The fixed blade 15 is formed by a pair of fixed blades on the left and right sides, and a V-groove that can be fixed in a state where the square pipe material is inclined at 45 ° to the left and right objects is formed in the central opening, and the diagonal line of the square pipe material A substantially ginkgo-shaped opening 15a having rising lines 15b and 15b raised in accordance with the external width is formed. The angle of the V groove is 90 °, and the positions of the rising lines 15b and 15b raised in accordance with the outer shape of the diagonal line of the square pipe material may be determined in accordance with the outer diameter of the diagonal line of the square pipe material.
[0019]
As a result, the fixed blade 15 does not need to be divided by half from the center, and a square pipe material clamping mechanism can be eliminated, and the square pipe material is fixed (clamped) by the pressing force of the movable blade 16. Since it is fixed to the V-groove inclined surface of the blade 15, it is possible by a frictional force due to a sufficient pressing force. In addition, since the substantially ginkgo-shaped opening is provided with a sufficient space above the top of the square pipe member, it can be easily set up since it can be inserted at an angle when it is first inserted.
[0020]
The movable blade 16 is formed with a tip portion having an obtuse angle β from the center, and is provided with a step portion in accordance with the width of the diagonal line of the square pipe material and has a substantially concave shape. This is the left and right movable blades extending downward leaving the obtuse angle from the center of the movable blade 16, but the tip of the obtuse angle β at the center of the movable blade 16 is pushed upward to form a hollow shape. It may be formed.
The blade thickness of the movable blade 16 is preferably 3.0 to 5.0 mm here, and is fitted into a gap in which a pair of fixed blades 15 are arranged on the left and right.
Fig.3 (a) is a front view of the cutting device 10 of a square pipe material, FIG.3 (b) is sectional drawing of the AA line shown to (a).
The fixed blade 15 is provided with fixed blades on the left and right sides, and is fixed by a support 17. In the center, a V-groove is formed so that the square pipe material W, which is a workpiece, can be fixed in a state where it is tilted 45 ° to the left and right, and a substantially ginkgo-shaped opening that rises in accordance with the outer diameter of the diagonal line of the square pipe material Is formed. The rising lines 15b and 15b at the rising position of the opening 15a are raised in accordance with the outer diameter width of the diagonal line of the square pipe material.
[0022]
4 (a) is a front view of the movable blade 16, and FIG. 4 (b) is a right side view thereof. As shown in FIG. 4A, the movable blade 16 is SKH51 of high-speed tool steel (commonly known as high-speed steel) and has a hardness of HRc 60 to 65 by heat treatment, but in addition to this, SKH55 or SKH56 may be used. Good. The step length λ, which is provided with stepped portions b, b on the left and right sides of the movable blade 16 and has a substantially concave shape, is preferably about 15 mm. However, the predetermined corner may have a length of 5 mm that can secure 5R.
The movable blade 16 is formed such that the biting portion a of the blade edge is formed with a width of 3 mm from the center to the left and right, an obtuse angle α is 110 °, and then the obtuse angle β is connected at 135 °. Then, the left side stepped portion b is formed in such a manner that the obtuse angle γ is returned to 250 ° counterclockwise from the inclined blade surface 16a, and the corner thereof is preferably 5R. Similarly, the right stepped portion b is formed by turning the obtuse angle γ by 250 ° clockwise from the inclined blade surface 16a, and the corner is 5R. In other words, the movable blade 16 leaves the inclined blade surfaces 16a and 16a of the movable blade 16 as they are in accordance with the outer diameter width of the diagonal line c of the square pipe material, and extends the left and right step portions 16b and 16b having substantially concave shapes downward. It is convenient.
[0023]
Fig.5 (a) is a front view of the fixed blade 15, FIG.5 (b) is sectional drawing of the BB line shown to (a). As shown to Fig.5 (a), the fixed blade 15 is SKD11 of alloy tool steel. SKD11 is more excellent in wear resistance and toughness than high-speed steel, and is suitable for the fixed blade 15, but other steel, for example, DC53 of cold die steel may be used. In the opening portion 15a, rising lines 15b and 15b are raised vertically in accordance with the width of the diagonal line c of the square pipe material, and the ceiling portion of the opening portion 15a is formed by an arc. Although this arc may be an ellipse, it is easier to carry in the square pipe material W if a space is secured above the top portion Wa of the square pipe material W with a length of about half the width of the diagonal line c. Further, a relief 15d is provided on the back surface of the fixed blade 15, and when the chips move downward from the blade portion, the sliding resistance disappears due to the relief, and the chips fall easily to the chip receiver.
[0024]
Next, the operation of the cutting device for the square pipe member having the above configuration will be described in detail with reference to FIGS.
As shown in FIG. 1, a square pipe member cutting device 10 according to the present invention is installed on a table 2 of a 10-ton class power press 1. For example, a 40 mm square pipe material (see FIG. 6) is inserted into the opening 15a of the fixed blade 15 and abutted against a stopper block whose stopper position is determined to have a predetermined cutting length. At this time, the other end is supported by a V block (not shown) provided so as to support the square pipe material horizontally, and both ends are supported. The V block is obtained by combining the height of the V groove of the fixed blade 15 and the height of the V block in advance so that the square pipe material is horizontal. If the cutting length greatly protrudes from the table 2, a sub-table (not shown) may be appropriately prepared and the V block may be fixed on the sub-table.
[0025]
In preparation for operation, the start button of the hydraulic device 3 is pushed, the motor is driven and the pump is rotated to generate high pressure. Stroke adjustment is performed in accordance with the piston stroke adjustment scale 5 of the high-pressure cylinder 4 (not shown), and the hydraulic pressure and the like are further adjusted.
When the operation preparation is completed, when the start buttons 6a and 6b of the operation panel 6 of the power press 1 are pressed simultaneously with both hands or the foot switch 7 is stepped on, the hydraulic device 3 disposed at the lower rear of the power press 1 The pressure oil generated by the pump is circulated through the high pressure hose and pumped, the pressure oil enters the high pressure cylinder 4 and the piston (not shown) descends.
As shown in FIG. 3, the tip end surface of the piston abuts on a punch head which is a buffer member 18 placed on the top 12 of the cutting device 10 of the square pipe material, and presses the top 12 as it is. The punch head is made of metal and fixed by bolts. Then, the top 12 is pushed down and the movable blade 16 is pushed down.
[0026]
FIG. 6 is an enlarged view of the vicinity of the opening shown in FIG. 3, showing a state in which the square pipe material W is cut, (a) is the starting position of the movable blade 16, (b) is the midway position, (C) is explanatory drawing which shows the position of the minimum cut | disconnected. As shown in FIGS. 6A and 6B, the movable blade 16 pressed against the tip surface of the piston first has the central biting portion a of the movable blade 16 at the top portion Wa of the square pipe material W. The movable blade 16 bites into the gap between the fixed blades 15 and descends, and the cutting portion is enlarged from the upper part to the lower part. As shown in FIG. 6A, the two-dot chain line workpiece described in the square pipe material W shows a deformation process of the chips d before they become chips d by the movable blade 16. In the first half of the deformation process, the chips d continue to be generated in the square pipe material W, and start to protrude outside the square pipe material W after passing through the diagonal line c at the intermediate point. And as shown in FIG.6 (c), when the movable blade 16 finally reaches | attains the position of the lowest limit and the chip | tip d is piled up two sheets, the chip | tip d has the maximum full length. As a result, the two stacked chips d collide with the right and left step portions b of the movable blade 16 formed in a substantially concave shape, and the R portion of the corner of b. Due to this collision, the total length of the chips d is narrowed, forcing deformation and dropping so as to be flipped downward.
[0027]
On the other hand, when the lower limit is reached by adjusting the stroke of the piston, the circuit of the solenoid valve (P port, T port) is switched by turning ON / OFF the limit switch. Then, when the flow of pressure oil in the cylinder is reversed, the piston turns upward, and the springs 23, 23, 14 of the posts 13, 13, 14, 14 provided at the four corners of the square pipe material cutting device 10, The top 12 is pushed up by the urging force of 24, 24, and accordingly, the movable blade 16 is lifted out of the gap between the fixed blades 15, 15, and returns to the original position.
[0028]
In this way, the single cutting operation is completed. In the case of cutting multiple pieces, the square pipe material inserted into the opening of the fixed blade 15 is manually pushed out, pressed against the stopper position to determine the cutting length, and multiple pieces are taken by pressing the start buttons 6a and 6b. Can be cut. Note that simultaneous pressing with both hands of the start buttons 6a and 6b is a safety measure. Furthermore, by adding an automatic feeding device for the square pipe material, the feeding of the square pipe material is automatically performed at the same time as the cutting is completed, so that automatic operation is possible.
[0029]
The present invention can be modified and changed in various ways within the scope of its technical idea, and the present invention modifies and changes the installation method of the dust remover using the permanent fixing plate and the fixture used in the method. Naturally, it extends to what has been done. For example, the shape of the opening 15a may be an inverted V shape in which a square pipe material is translated upward as it is instead of an arc.
[0030]
【The invention's effect】
According to the first aspect of the present invention, the pair of fixed blades are generated on the back side of the corner of the cut surface by providing the substantially canopy-shaped opening portion raised in accordance with the outer diameter of the diagonal line of the square pipe material. It is possible to prevent the occurrence of burrs and burrs. In addition, the provision of the substantially ginkgo-shaped opening makes it easy to insert the square pipe material. Furthermore, the tip of the movable blade having an obtuse angle shape at the center leaves the movable blade at the tip according to the width to the left and right corners of the square pipe material, and the left and right movable blades are extended downward to form a substantially concave shape. Therefore, there is no need to make a hole at the tip of the blade thickness, a step portion can be provided so that chips do not adhere, and a square pipe material cutting device that does not require a clamp mechanism for the square pipe material is provided. Can do.
[0031]
According to the invention described in claim 2, an obtuse angle of 95 to 119 ° with a width of 2 to 4 mm as a chamfered portion at the most advanced portion of the lower cutting edge formed at an obtuse angle of 125 to 145 ° which is a V-shaped cutting edge. As a result, the chip bites into the top of the square pipe material, and the subsequent cutting is finished, and at the same time it is bounced downward and dropped, so automation is possible and the life of the movable blade is extended. Can do.
[0032]
According to the third aspect of the present invention, it is possible to provide a 3-7R corner portion at the corner portion to be formed and the step portion formed by returning from the inclined blade surface having an obtuse angle of 130 to 140 ° to 240 to 260 °. Therefore, the adhered chips collide with the R-shaped corner portion of the stepped portion of the movable blade, and the entire length of the chips is compressed by this impact, deformed into a U shape or a V shape, and is pushed downward. Can be dropped. As a result, there is no adhesion of chips to the movable blade, so that an automated operation can be performed.
[0033]
According to the fourth aspect of the present invention, the square pipe material is inserted into the opening that is raised by pressing the gap according to the outer diameter of the diagonal line of the square pipe material, the position is determined, and the movable blade is moved downward. In addition, since the R portions at the left and right ends of the generated chips are positively applied to the stepped portion provided in the substantially concave corner of the movable blade, no chipping occurs and the chips adhere to the movable blade. It is possible to provide a cutting method using a square pipe material cutting device that can be dropped and automatically operated.
[Brief description of the drawings]
FIG. 1 is a perspective view of a power press equipped with a cutting device for a square pipe material of the present invention.
FIG. 2 is an enlarged perspective view of the square pipe member cutting device of the present invention.
3A is a front view of a cutting device for a square pipe member, and FIG. 3B is a cross-sectional view taken along line AA shown in FIG.
4A is a front view of a movable blade, and FIG. 4B is a right side view thereof.
5A is a front view of a fixed blade, and FIG. 5B is a cross-sectional view taken along line BB shown in FIG. 5A.
6 is an enlarged view of the vicinity of the opening shown in FIG. 3, showing a state where the square pipe material W is being cut, (a) showing the start position of the movable blade, and (b) showing the position in the middle. (C) is explanatory drawing which shows the position of the cut | disconnected minimum floor.
FIG. 7 is a perspective view showing a main part of the prior art as a partial cross section.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Power press 2 Table 3 Hydraulic device 4 High pressure cylinder 5 Stroke adjustment scale 6 Operation panel 6a, 6b Start button 6c, 7c Emergency stop button 7 Foot switch 10 Cutting device 11 Base 12 Top 13, 14 Post 15 Fixed blade 15a Opening 15b Rising line 15d Escape 16 Movable blade 16a Inclined blade surface 16b Stepped portion 17 Support 18 Buffer member 19 Ball bushing 23, 24 Spring a Chamfered portion b Stepped portion c Diagonal line R Corner W Square pipe material

Claims (4)

In a square pipe material cutting device comprising a pair of fixed blades for fixing the corner of the square pipe material facing downward, and a movable blade for cutting the square pipe material by entering between the pair of fixed blades,
The pair of fixed blades have a substantially ginkgo-shaped opening that is higher than the height of the diagonal line of the square pipe material in order to insert the square pipe material,
The movable blade has an obtuse V-shaped cutting blade arranged at the center, leaving the movable blade at the tip according to the width of the diagonal line of the square pipe material, and extending the left and right movable blades downward in a substantially concave shape. An apparatus for cutting a square pipe material. The lower cutting edge shape of the movable blade has an obtuse angle of 95 to 119 ° with a width of 2 to 4 mm as a chamfered portion at the tip of the lower cutting edge formed at an obtuse angle of 125 to 145 ° from the center to the left and right objects. The square pipe material cutting device according to claim 1. The tip shape of the lower cutting edge of the movable blade is such that the biting portion is formed at the center, followed by an obtuse angle of 130 to 140 °, and the inclined blade surface is formed into a substantially concave shape. In this case, it is formed by returning to 240 to 260 °, and 3-7R is formed at the stepped portion and the corner to be formed. The cutting apparatus of the square pipe material of Claim 1 or Claim 2. A cutting method using the square pipe material cutting device,
A first step of determining the length of the square pipe material by inserting the square pipe material into a substantially ginkgo-shaped opening with the corner of the square pipe material directly below, and abutting the end face against the stopper;
A second step of cutting the square pipe material by causing a substantially concave movable blade to enter between a pair of fixed blades;
A third step of finally removing chips by a corner R of the step portion of the substantially concave movable blade;
The cutting method using the cutting device of the square pipe material characterized by including these.

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