JP7808809B2 - Attachment for cutting machine, cutting machine, and cutting method - Google Patents

Description

The present invention relates to an attachment for a cutting machine, a cutting machine, and a cutting method.

Patent Document 1 discloses a structure in which a reduced thickness section is provided in the web of an H-shaped steel beam that is joined to a steel column.

Japanese Patent Application Laid-Open No. 2022-98141

In the invention described in Patent Document 1, a reduced-thickness section is provided over a specified area from the scallop to prevent early cracking in the flange of the beam due to stress concentration around the scallop. However, it is difficult to add a reduced-thickness section like that described in Patent Document 1 to a beam that has already been joined to a column. For beams before construction, it is possible to add a reduced-thickness section using large processing equipment such as a portal planer that can fix and process long members several meters long, but adding this to all beams would require a great deal of time and money.

The purpose of this invention is to easily perform additional processing on long steel members, such as H-shaped steel members, which are made up of flat plates with their short sides perpendicular to one another.

The present invention is an attachment for a cutting machine that attaches to a steel member a cutting machine that performs cutting on a first flat plate of a long steel member having a first flat plate and a second flat plate arranged so that the short sides of the steel member are approximately perpendicular to each other, and comprises a holding part that holds the cutting machine that performs cutting using a rotating cutting part, and a fixing part that fixes the cutting machine to only one second flat plate of the steel member so that the direction of the central axis of rotation of the cutting part faces the first flat plate, and the cutting machine is fixed to the steel member only by the fixing part, and the fixing part has a holding mechanism that holds the second flat plate, and the holding part has a guide rail that guides the cutting machine so that it can move along the longitudinal direction of the steel member.

The present invention also provides a cutting method for cutting a first flat plate of an elongated steel member having first and second flat plates arranged so that their short sides are approximately perpendicular to each other, using a cutting machine equipped with a rotating cutting part, the method comprising the steps of: fixing the cutting machine to the steel member via an attachment having a holding part that holds the cutting machine and has guide rails that guide the cutting machine so that it can move along the longitudinal direction of the steel member; and a fixing part that has a holding mechanism that holds the second flat plate and fixes the cutting machine to only one second flat plate of the steel member so that the central axis of rotation of the cutting part faces the first flat plate; and cutting the first flat plate by abutting the rotating cutting part against the first flat plate and moving the cutting machine along the guide rail, wherein the cutting machine is fixed to the steel member only by the fixing part .

This invention makes it easy to perform additional machining on long steel components, such as H-shaped steel members, which are made up of flat plates with their short sides perpendicular to one another.

1 is a diagram showing an example of a member to be cut by a cutting machine according to an embodiment of the present invention; FIG. 2 is an enlarged view of a cross section taken along line A-A in FIG. 1, showing a state in which a web portion is cut by a cutting machine attached to a steel member via an attachment for a cutting machine according to an embodiment of the present invention. 3 is a diagram showing the cutting machine as seen from the direction indicated by arrow B in FIG. 2. FIG. FIG. 4 is an enlarged cross-sectional view taken along line CC in FIG. 3. 5 is a cross-sectional view showing a modification of the attachment for a cutting machine according to the embodiment of the present invention, the cross-sectional view corresponding to FIG. 4. FIG.

The following describes an attachment for a cutting machine, a cutting machine, and a cutting method according to an embodiment of the present invention, with reference to the drawings.

First, referring to Figure 1, we will explain a steel member to which a cutting machine 100 is attached via a cutting machine attachment 10 according to an embodiment of the present invention and which is cut by the cutting machine 100.

The workpiece to be machined by the cutting machine 100 is a long steel member having a first flat plate and a second flat plate arranged so that their short sides intersect approximately perpendicularly. For example, it is an H-shaped steel member having a web portion 5 (first flat plate) and flange portions 3 and 4 (second flat plates) arranged so that their short sides intersect approximately perpendicularly, such as the beam member 2 shown in Figure 1.

In the example shown in Figure 1, the column member 1 is a steel pipe column erected vertically, composed of steel pipe sections 1a formed from square steel pipes and diaphragms 1b disposed between the steel pipe sections 1a and integrated with the steel pipe sections 1a. The beam member 2 is an H-shaped steel beam having a pair of flange sections 3, 4 and a web section 5 sandwiched between the pair of flange sections 3, 4. Note that the diaphragm 1b is not limited to a through diaphragm as shown in the figure, but may also be an internal diaphragm welded to the inside of the steel pipe. The beam member 2 may also be a so-called rolled H-shaped steel beam formed by rolling, or a so-called built H-shaped steel beam formed by welding the pair of flange sections 3, 4 to the web section 5.

The beam member 2 is fixed to the column member 1 by welding the lower flange 3, located vertically below, and the upper flange 4, located vertically above, to the diaphragm 1b, and by bolting or welding the web portion 5 to the gusset plate 1c provided on the column member 1.

In order to weld the lower flange 3 and diaphragm 1b continuously along the width of the lower flange 3, a lower scallop 5a cut out in an approximately quarter-circle shape is formed in the web portion 5, and in order to weld the upper flange 4 and diaphragm 1b continuously along the width of the upper flange 4, an upper scallop 5b cut out in an approximately quarter-circle shape is formed in the web portion 5.

In addition, to prevent stress from concentrating around the lower end of the lower scallop 5a, which could cause cracks in the lower flange 3 to originate from this area, the web portion 5 is provided with a reduced thickness portion 6, where the thickness of the web portion 5 is reduced over a predetermined range from the lower scallop 5a, along the axial direction (longitudinal direction) of the beam member 2. The reduced thickness portion may be provided not only around the lower scallop 5a, but also around the upper scallop 5b.

The processing of the reduced thickness section 6 in the web section 5 must be performed on a relatively long beam member 2 having a pair of flange sections 3, 4 and a web section 5, even before the beam member 2 is welded to the column member 1. This necessitates the use of large processing equipment such as a portal planer that can secure and process long members several meters in length. For this reason, it would take a great deal of time and money to process the reduced thickness section 6 in all beam members 2 used in a steel-framed building.

In addition, even in existing steel-framed buildings, it is desirable to form a reduced-thickness section 6 in the web section 5 to prevent cracks from occurring in the beam member 2, but it is extremely difficult to accurately add a reduced-thickness section 6 to a beam member 2 that has been welded to a column member 1.

To solve this problem, in this embodiment, a cutting machine 100 is attached to the beam member 2 (steel member) via a cutting machine attachment 10, as described below. This makes it possible to accurately and easily perform additional machining of reduced thickness sections 6, etc. on the web portion 5 (first flat plate) using the cutting machine 100, even after the beam member 2 has been welded to the column member 1.

Next, with reference to Figures 2 to 4, the configuration of the cutting machine attachment 10 (hereinafter referred to as "attachment 10") and the general configuration of the cutting machine 100 attached to the beam member 2 (steel member) via the attachment 10 will be described. Note that Figure 2 is an enlarged cross-section taken along line A-A in Figure 1, showing the cutting machine 100 attached to the beam member 2 via the attachment 10 cutting the web portion 5 (first flat plate), Figure 3 is a view of the cutting machine 100 as seen from the direction indicated by arrow B in Figure 2, and Figure 4 is an enlarged cross-section taken along line C-C in Figure 3.

As shown in Figures 2 to 4, the cutting machine 100 includes a cutting unit 40, a drive unit 50 that rotates and drives the cutting unit 40, and a movement unit 60 that can move the cutting unit 40 along a guide rail 13 (described below) that is provided on the attachment 10.

The cutting unit 40 is a cutting tool, such as an end mill, suitable for cutting the surface of the web portion 5 and reducing its thickness to form the reduced-thickness portion 6. The cutting unit 40 is held at one end of the spindle 42 and is rotated by the driving force of the drive unit 50, which is transmitted to the spindle 42 via a transmission mechanism 52 composed of a reduction gear or the like. The drive unit 50 may be an electric motor or a pressure motor.

The moving unit 60 has a housing portion 61 that houses the spindle 42 so that it can slide freely along the direction of the central axis of rotation C1, and a sliding portion 64 that has a rail portion 65 that is slidably inserted into a guide rail 13 (described below) that is provided on the attachment 10.

The position of the spindle 42 housed in the housing 61 is indirectly adjusted by a position adjustment unit 62, which can change the relative position of the transmission mechanism 52 with respect to the moving unit 60. By adjusting the position of the spindle 42 with respect to the housing 61 using the position adjustment unit 62 in this way, the cutting depth performed by the cutting unit 40 can be set.

The rail portion 65 provided on the sliding portion 64 is a protrusion extending in a direction perpendicular to the direction of the central axis C1 of rotation of the cutting portion 40, and its cross-sectional shape is an inverted figure-eight that is dovetail-shaped and inserted into the guide rail 13 (described below) provided on the attachment 10.

As shown in Figures 3 and 4, the sliding portion 64 is provided with a feed screw member 67 that threads into a female threaded hole 14a formed in a protrusion 14 (described below) on the attachment 10 and is rotatably supported at both ends, and a slide adjustment portion 66 that adjusts the amount and direction of sliding of the sliding portion 64 relative to the attachment 10 by rotating the feed screw member 67 via a bevel gear (not shown). Note that the feed screw member 67 may have only one end rotatably supported, with the other end being an unsupported free end.

The cutting unit 40 moves in response to the displacement of the sliding unit 64 relative to the attachment 10. Therefore, by adjusting the sliding direction and amount of sliding of the sliding unit 64 using the slide adjustment unit 66, it is possible to adjust the direction and length of cutting of the material by the cutting unit 40.

As shown in Figures 2 to 4, the attachment 10 used to attach the cutting machine 100 configured as described above to the beam member 2 is a steel block body equipped with a holding portion 12 that holds the cutting machine 100 and a fixing portion 15 that fixes the cutting machine 100 to the beam member 2 (steel member) so that the rotation center axis C1 of the cutting portion 40 of the cutting machine 100 faces the web portion 5 (first flat plate). The holding portion 12 is provided with guide rails 13 that guide the cutting machine 100 movably along the longitudinal direction of the beam member 2 (steel member), and the fixing portion 15 is provided with gripping mechanisms 16, 17, and 18 that grip the lower flange 3 (second flat plate).

As shown in Figures 2 and 4, the guide rail 13 is a groove that extends along the longitudinal direction of the beam member 2 when the attachment 10 is attached to the beam member 2, and its cross-sectional shape is an inverted figure-eight (dovetail) shape. The above-mentioned rail portion 65 provided on the moving part 60 of the cutting machine 100 is inserted into the guide rail 13 in a dovetail manner.

As shown in FIG. 4, the holding portion 12 is provided with a protrusion 14 that protrudes from the bottom surface of the guide rail 13 toward the cutting machine 100. A female threaded hole 14a is formed in the protrusion 14 along the extension direction of the guide rail 13, and threads into a feed screw member 67 provided on the cutting machine 100. The protrusion 14 functions as a nut member of a feed mechanism that moves in response to the rotation of the feed screw member 67, and is attached to the bottom surface of the guide rail 13 with a bolt or the like (not shown).

The gripping mechanism is primarily composed of a pair of opposing portions 16, 17 (first opposing portion 16 and second opposing portion 17) that face each other across the lower flange 3 (second flat plate), and a plurality of fixing screw members 18 that are threaded into a plurality of through holes 17a formed in the second opposing portion 17. The through holes 17a into which the fixing screw members 18 are threaded are formed to penetrate the second opposing portion 17 so that one end opens on the lower flange 3 side.

When the lower flange 3 is inserted between the first opposing portion 16 and the second opposing portion 17, the multiple fixing screw members 18 can be tightened so that their tips abut the lower flange 3, allowing the first opposing portion 16 and the fixing screw members 18 to grip the lower flange 3. The fixing screw members 18 are not limited to hexagonal bolts as shown in the figure, and can be any type of screw member with a flat tip, such as a hexagonal socket set screw, or a hollow set screw.

Using the attachment 10 configured as described above, which can hold the cutting machine 100 and grip the lower flange 3, the cutting machine 100 is attached to the beam member 2 with the central axis of rotation C1 of the cutting unit 40 facing the web portion 5 to be machined, as shown in Figures 2 and 3.

The attachment 10 also includes a plate-like member 20 provided between the first opposing portion 16 and the lower flange 3, and a plurality of screw members 21 that are threaded into a plurality of through holes 16a formed in the first opposing portion 16 and whose screw tips abut against the plate-like member 20.

The through holes 16a into which the screw members 21 are threaded are formed through the first opposing portion 16 with one end opening toward the lower flange 3. As shown in Figures 3 and 4, these through holes 16a are arranged at predetermined intervals in the longitudinal direction of the lower flange 3 (second flat plate) and at predetermined intervals in the lateral direction of the lower flange 3. Specifically, three through holes 16a are formed along the longitudinal direction of the first opposing portion 16 and three along the lateral direction, resulting in a total of nine through holes 16a. The through holes 17a into which the fixing screw members 18 are threaded are each formed opposite the through hole 16a located in the center of the lateral direction of the first opposing portion 16.

The flange portion of rolled H-section steel generally has a slight slope, and with built H-section steel, a phenomenon known as "umbrella bending" occurs, in which the flange portion bends slightly during welding.

For this reason, for example, as shown in Figure 4, if the lower flange 3, whose upper surface is slightly inclined in the short direction, is simply gripped by the first opposing portion 16 and the fixing screw member 18, the rotation center axis C1 of the cutting portion 40 will be inclined relative to the web portion 5 (first flat plate). Specifically, the cutting angle θ formed between the direction of the rotation center axis C1 of the cutting portion 40 and the surface of the web portion 5 will be greater than 90 degrees.

If cutting is performed in this manner with the central axis of rotation C1 of the cutting unit 40 slightly tilted relative to the web portion 5, i.e., not perpendicular, the bottom surface of the reduced thickness portion 6 formed by the cutting unit 40 will not be parallel to the surface of the web portion 5, making it difficult to form a reduced thickness portion 6 of a consistent thickness in the web portion 5.

In contrast, in this embodiment, as described above, multiple screw members 21 are provided on the first opposing portion 16. Therefore, for example, in cases where the surface of the lower flange 3 is slightly inclined in the short direction as shown in FIG. 4, the screw member 21 located closest to the web portion 5 can be reduced in the amount of protrusion toward the lower flange 3, while the screw member 21 located farthest from the web portion 5 can be increased in the amount of protrusion toward the lower flange 3. This makes it possible to adjust the cutting angle θ formed between the direction of the rotation center axis C1 of the cutting portion 40 and the surface of the web portion 5 to approximately 90 degrees, i.e., the direction of the rotation center axis C1 of the cutting portion 40 is perpendicular to the surface of the web portion 5.

Furthermore, even if the surface of the lower flange 3 is slightly inclined in the longitudinal direction, the cutting angle θ can be adjusted to an optimal angle by appropriately changing the protrusion amount of the screw member 21 arranged along the longitudinal direction.

In this way, the multiple screw members 21 threaded into the multiple through holes 16a formed in the first opposing portion 16 function as an inclination adjustment portion that adjusts the inclination of the rotation center axis C1 of the cutting portion 40 relative to the web portion 5 (first flat plate).

Furthermore, when the thickness of the plate-shaped member 20 provided between the first opposing portion 16 and the lower flange 3 is changed, the height from the lower flange 3 to the rotation center axis C1 of the cutting unit 40 changes. In other words, by changing the thickness of the plate-shaped member 20, the position at which the reduced thickness portion 6 is machined relative to the web portion 5 can be changed. Specifically, the thinner the plate-shaped member 20, the closer the reduced thickness portion 6 is formed to the lower flange 3, and the thicker the plate-shaped member 20, the farther the reduced thickness portion 6 is formed from the lower flange 3.

For this reason, by preparing multiple plate-shaped members 20 with different thicknesses and replacing the plate-shaped members 20 as needed, the height from the lower flange 3 to the rotation center axis C1 of the cutting portion 40, i.e., the distance between the lower flange 3 and the rotation center axis C1, can be adjusted to any desired size, and the reduced thickness portion 6 can be machined at the desired position on the web portion 5.

In this way, the plate-like member 20 functions as a distance adjustment part that adjusts the distance between the lower flange 3 and the rotation center axis C1.

The distance between the lower flange 3 and the rotation center axis C1 can also be changed by changing the amount that the multiple screw members 21 provided on the first opposing portion 16 protrude toward the lower flange 3. Therefore, instead of replacing the plate-shaped member 20, the height from the lower flange 3 to the rotation center axis C1 of the cutting portion 40 can be adjusted by changing the amount that the multiple screw members 21 protrude. In this case, the multiple screw members 21 function as a distance adjustment unit.

The attachment 10 is also provided with an eyebolt 24 (hanging part) for lifting the cutting machine 100 held by the holding part 12 together with the attachment 10 via a lifting device such as a chain block.

For example, it is expected that work using the cutting machine 100 configured as described above to process the reduced thickness section 6 in the beam member 2 of an existing steel-framed building will be carried out at a high altitude. In such cases, by hanging the lower hook of a chain block, the upper hook of which is engaged with the column member 1 or beam member 2, on the eyebolt 24, the cutting machine 100 integrated with the attachment 10 can be lifted relatively easily to the work site and the cutting machine 100 integrated with the attachment 10 can be prevented from falling.

Next, we will explain, with reference to Figures 1 to 4, how to cut the reduced-thickness portion 6 into the beam member 2 using the attachment 10 and cutting machine 100 configured as described above.

If the beam member 2 to be processed is a beam member 2 of an existing building, the first step is to remove fire-resistant covering material and other coating materials from the lower flange 3 (second flat plate) to which the attachment 10 is attached and the web portion 5 (first flat plate) to which the reduced-thickness portion 6 is processed. On the other hand, if the beam member 2 to be processed has not yet been joined to a column member 1, the beam member 2 is placed flat so that the surface of the web portion 5 to which the reduced-thickness portion 6 is processed faces upward.

Next, the lower flange 3 is gripped by the above-mentioned gripping mechanism provided on the attachment 10, thereby fixing the cutting machine 100 to the beam member 2 (steel member) (fixing process). By fixing the cutting machine 100 to the beam member 2 via the attachment 10, the rotation center axis C1 of the cutting unit 40 is oriented toward the web portion 5.

When the cutting machine 100 is fixed to the beam member 2, the position of the spindle 42 holding the cutting part 40 is adjusted in advance by the position adjustment unit 62 so that it is at the farthest position from the gripping mechanism, so that the tip of the cutting part 40 does not come into contact with the web part 5.

Furthermore, if the position of the rotation center axis C1 of the cutting portion 40 is deviated from the position where the reduced thickness portion 6 should be machined, i.e., if the distance between the lower flange 3 and the rotation center axis C1 is not the desired distance, the plate-like member 20, which serves as the distance adjustment portion, can be replaced with one of a different thickness, or the amount of protrusion toward the lower flange 3 of the multiple screw members 21 provided on the first opposing portion 16 can be changed to adjust the position of the rotation center axis C1 to the appropriate position.

Furthermore, if the direction of the rotational center axis C1 of the cutting machine 100 fixed to the beam member 2 is not perpendicular to the surface of the web portion 5, the magnitude of the above-mentioned cutting angle θ can be adjusted to approximately 90 degrees by appropriately changing the amount of protrusion toward the lower flange 3 of the multiple screw members 21 provided in the first opposing portion 16, particularly the screw member 21 located closest to the web portion 5 and the screw member 21 located farthest from the web portion 5.

Once it is confirmed that the cutting machine 100 is securely fixed to the beam member 2, the cutting unit 40 begins cutting the web portion 5.

Specifically, the cutting unit 40 is rotated by the driving force of the drive unit 50, and the position adjustment unit 62 is adjusted to move the spindle 42 toward the web portion 5 so that the tip surface of the rotating cutting unit 40 comes into contact with the surface of the web portion 5. The position adjustment unit 62 is then adjusted so that the depth cut by the cutting unit 40 matches the preset depth of the reduced thickness portion 6, and the spindle 42 is further moved toward the web portion 5. This allows the cutting unit 40 to begin cutting the web portion 5.

Next, to form the reduced thickness portion 6 along the longitudinal direction of the web portion 5, the cutting machine 100 is moved along the longitudinal direction of the beam member 2 while the rotating cutting unit 40 is in contact with the web portion 5 (moving cutting process).

Specifically, the slide adjustment unit 66, which adjusts the amount and direction of sliding of the cutting machine 100 relative to the attachment 10, is adjusted little by little, and the rotating cutting unit 40 is gradually moved along the longitudinal direction of the beam member 2. As a result, grooves that become the reduced thickness portions 6 are formed by the cutting unit 40 along the longitudinal direction on the surface of the web portion 5.

After going through the above process, a reduced thickness portion 6 is added to the web portion 5 of the beam member 2 using the cutting machine 100.

In addition, if the width of the reduced thickness portion 6 in the short direction of the web portion 5 is larger than the diameter of the cutting portion 40, i.e., the diameter of the tool, the reduced thickness portion 6 may be partially cut using the above-mentioned process, and then replaced with a plate-like member 20 of a different thickness to change the distance between the lower flange 3 and the rotation center axis C1 of the cutting portion 40. The above-mentioned process may then be repeated to form a reduced thickness portion 6 of the desired width.

Furthermore, if the beam member 2 is a built H-section steel and the excess weld between the web portion 5 and the lower flange 3 is relatively large and the web portion 5 cannot be cut directly, the excess weld may first be cut across the area where the reduced thickness portion 6 will be formed, and then the reduced thickness portion 6 may be formed in the web portion 5.

The above embodiment provides the following advantages:

In accordance with the above configuration, in order to cut the reduced thickness portion 6 into the web portion 5 (first flat plate), the cutting machine 100 is fixed to the beam member 2 via an attachment 10 equipped with a holding portion 12 having guide rails 13 that movably guide the cutting machine 100 along the longitudinal direction of the beam member 2 (steel member), and a fixing portion 15 having gripping mechanisms 16, 17, and 18 that grip the lower flange 3 (second flat plate) so that the rotation center axis C1 of the cutting portion 40 faces the web portion 5.

As a result, by bringing the rotating cutting part 40 into contact with the web part 5 and moving the cutting machine 100 along the guide rail 13, the reduced thickness part 6 can be easily machined into the web part 5. This makes it easy to perform additional machining on long steel members made of flat plates with orthogonal short sides, such as H-shaped steel members.

Furthermore, with the above configuration, even when processing using the cutting machine 100 requires high-altitude work, the cutting machine 100 integrated with the attachment 10 can be easily attached to the beam member 2 to be processed by hand via a chain block or the like. In this way, it is possible to complete the installation of the cutting machine 100 and the cutting process manually in a short time without using heavy machinery, thereby shortening the construction period and reducing the costs required for additional processing on the beam member 2, etc.

The following modifications are also within the scope of the present invention, and it is possible to combine the configurations shown in the modifications with the configurations described in the above embodiments, or to combine the configurations described in the different modifications below.

In the above embodiment, the multiple screw members 21 threaded into the multiple through holes 16a formed in the first opposing portion 16 function as the tilt adjustment portion. Alternatively, or in addition, a plate-like member 120 provided between the first opposing portion 16 and the lower flange 3 may function as the tilt adjustment portion, as in the modified example shown in Figure 5. Figure 5 is a cross-sectional view corresponding to Figure 4.

In the modified example shown in FIG. 5 , the plate-like member 120 disposed between the lower flange 3 (second flat plate) and the first opposing portion 16 has a first flat surface 120a on the lower flange 3 side that is not parallel to a second flat surface 120b on the first opposing portion 16 side, and the intersection angle α between the first flat surface 120a and the second flat surface 120b is set to a value similar to the inclination of the surface of the lower flange 3. Therefore, by preparing multiple plate-like members 120 with different intersection angles α and replacing the plate-like member 120 to match the inclination of the surface of the lower flange 3, it is possible to adjust the inclination of the rotation center axis C1 of the cutting portion 40 relative to the web portion 5 (first flat plate). Fine adjustments to the inclination are preferably made by adjusting the protrusion amount of the screw member 21 described above.

In the above embodiment, the steel member to which the cutting machine 100 is attached via the attachment 10 is an H-beam. The material to be machined by the cutting machine 100 is not limited to an H-beam, and can be any shape of steel member as long as it is a long steel member having a first flat plate and a second flat plate arranged so that the short sides are approximately perpendicular to each other. For example, it can be an angle steel with an L-shaped cross section, an I-beam with an I-shaped cross section, or a channel steel with a U-shaped cross section.

In addition, in the above embodiment, the processing performed on the web portion 5 by the cutting machine 100 is groove processing. The processing performed by the cutting machine 100 is not limited to groove processing, and may also be processing of through holes or elongated holes that penetrate the web portion 5, or processing of lower scallops 5a or upper scallops 5b, for example.

In addition, in the above embodiment, the cutting machine 100 is attached to the lower flange 3 of the beam member 2 via the attachment 10. Alternatively, the cutting machine 100 may be attached to the upper flange 4 of the beam member 2 via the attachment 10 so that it can process the portion of the web portion 5 closer to the upper flange 4. In this case, the upper flange 4 becomes the second flat plate.

In addition, in the above embodiment, the attachment 10 grips the lower flange 3 (second flat plate) using the first opposing portion 16 and the fixing screw member 18 provided on the second opposing portion 17. The gripping mechanism for gripping the lower flange 3 is not limited to the above configuration, and may be, for example, a vice or clamp, which grips the lower flange 3 by simply narrowing the gap between a pair of opposing members.

The above describes embodiments of the present invention, but these embodiments merely illustrate some of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

10... Attachment for cutting machine 100... Cutting machine 2... Beam member (steel member)
3... Lower flange (second flat plate)
5...Web portion (first flat plate)
6: Reduced thickness portion 12: Holding portion 13: Guide rail 15: Fixed portion 16: First opposing portion (gripping mechanism)
16a... Through hole 17... Second opposing part (gripping mechanism)
17a...through hole 18...fixing screw member (gripping mechanism)
20... Plate-shaped member (distance adjustment portion)
21...Screw member (tilt adjustment part, distance adjustment part)
24...Eyebolt (hanging part)
40: Cutting section 50: Driving section 60: Moving section 120: Plate-shaped member (tilt adjusting section)
120a: First plane; 120b: Second plane; C1: Rotation center axis

Claims (9)

An attachment for a cutting machine is attached to a long steel member, the steel member having a first flat plate and a second flat plate arranged so that their short sides are approximately perpendicular to each other, and the cutting machine performs cutting on the first flat plate of the long steel member,
a holding unit that holds the cutting machine that performs cutting processing using a rotating cutting unit;
a fixing part that fixes the cutting machine to only the second flat plate of the steel member so that a direction of a rotation center axis of the cutting part faces the first flat plate ,
The cutting machine is fixed to the steel member only by the fixing portion,
the fixing portion has a gripping mechanism that grips the second flat plate,
The holding portion has a guide rail that guides the cutting machine movably along the longitudinal direction of the steel member.
Attachment for cutting machines. The gripping mechanism includes:
a pair of opposing portions provided opposite to each other across the second flat plate;
a fixing screw member formed in one of the opposing portions and having one end threaded into a through hole that opens on the second flat plate side,
The second flat plate is gripped by the fixing screw member and the other opposing portion.
2. The attachment for a cutting machine according to claim 1. Further provided is a distance adjustment unit that adjusts the distance between the second flat plate and the rotation central axis.
2. The attachment for a cutting machine according to claim 1. further comprising an inclination adjustment unit that adjusts the inclination of the rotation central axis with respect to the first flat plate;
2. The attachment for a cutting machine according to claim 1. the gripping mechanism has a pair of opposing portions provided opposite to each other across the second flat plate,
the inclination adjustment portion is a plurality of screw members that are screwed into a plurality of through holes that are formed in one of the opposing portions and have one end that opens on the second flat plate side,
the plurality of through holes are arranged at predetermined intervals in at least one of the longitudinal direction and the lateral direction of the second flat plate,
The inclination of the rotation central axis with respect to the first flat plate is adjusted by changing the protrusion amounts of the plurality of screw members that protrude from one of the opposing portions toward the second flat plate.
5. The attachment for a cutting machine according to claim 4. the gripping mechanism has a pair of opposing portions provided opposite to each other across the second flat plate,
the inclination adjustment portion is a plate-like member disposed between the second flat plate and one of the opposing portions,
a plurality of the plate-like members are prepared, each having a different angle formed between a first plane on the second flat plate side and a second plane on one of the opposing portions,
The inclination of the rotation central axis with respect to the first flat plate is adjusted by replacing the plate-like member.
5. The attachment for a cutting machine according to claim 4. Further provided is a lifting portion for lifting the holding portion and the fixing portion via a lifting tool.
2. The attachment for a cutting machine according to claim 1. a cutting machine including the cutting unit, a drive unit that rotationally drives the cutting unit, and a movement unit that can move the cutting unit along the guide rail,
The attachment is attached to the steel member via the cutting machine attachment according to any one of claims 1 to 7.
Cutting machine. A cutting method for cutting a first flat plate of an elongated steel member having a first flat plate and a second flat plate arranged so that their short sides are substantially perpendicular to each other, using a cutting machine equipped with a rotating cutting unit,
a step of fixing the cutting machine to the steel member so that the direction of the central axis of rotation of the cutting unit faces the first flat plate via an attachment including: a holding unit that holds the cutting machine and has a guide rail that guides the cutting machine movably along the longitudinal direction of the steel member; and a fixing unit that has a gripping mechanism that grips the second flat plate and fixes the cutting machine to only the second flat plate of the steel member so that the direction of the central axis of rotation of the cutting unit faces the first flat plate;
a step of cutting the first flat plate by bringing the rotating cutting part into contact with the first flat plate and moving the cutting machine along the guide rail,
The cutting machine is fixed to the steel member only by the fixing portion.
Cutting method.