Attachment for cutting machine, cutting machine, and cutting method

Abstract

To perform additional processing to an elongated steel member, formed by plates whose short directions are orthogonal to each other, easily.SOLUTION: An attachment 10 for a cutting machine includes: a holding part 12 which holds a cutting machine 100 which performs cutting with a rotary cutting part 40; and a fixing part 15 which fixes the cutting machine 100 to a beam member 2 so that a direction of a rotation center axis C1 of the cutting part 40 faces a web part 5. The fixing part 15 has holding mechanisms 16, 17, 18 for holding a lower flange 3. The holding part 12 has a guide rail 13 which movably guides the cutting machine 100 along a longitudinal direction of the beam member 2.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an attachment for a cutting machine, a cutting machine, and a cutting method. [Background technology]

[0002] Patent Document 1 discloses a configuration in which a reduced thickness portion is provided in the web portion of an H-shaped steel beam joined to a steel column. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-98141 Summary of the Invention [Problem to be solved by the invention]

[0004] In the invention described in Patent Document 1, a reduced thickness portion is provided in a predetermined range from the scallop in order to prevent early cracks from occurring in the flange portion of the beam due to stress concentration around the scallop. However, it is difficult to add a reduced thickness portion as described in Patent Document 1 to a beam that has been joined to a column, and although it is possible to add a reduced thickness portion to a beam before construction using large processing equipment such as a portal planer that can fix and process long members several meters long, adding such a portion to all beams would require a great deal of cost and time.

[0005] The present invention aims to easily perform additional machining on long steel members, such as H-shaped steel members, which are made up of flat plates whose short sides are perpendicular to each other. [Means for solving the problem]

[0006] The present invention relates to an attachment for a cutting machine for attaching a cutting machine to a long steel member having a first flat plate and a second flat plate arranged so that their short sides are substantially perpendicular to each other, the attachment comprising: a holding part for holding the cutting machine that performs cutting using a rotating cutting part; and a cutting machine that is attached to the steel member so that the direction of the rotation center axis of the cutting part faces the first flat plate. Only one second plate a fixing portion that fixes the The cutting machine is fixed to the steel member only by the fixing part, The fixing portion has a gripping mechanism that grips the second flat plate, and the holding portion has a guide rail that guides the cutting machine so that it can move along the longitudinal direction of the steel member.

[0007] The present invention also provides 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 side directions are approximately perpendicular to each other, using a cutting machine equipped with a rotating cutting part, a holding section that holds the cutting machine and has a guide rail that guides the cutting machine so that it can move along the longitudinal direction of the steel member; and a fixing section that has a gripping mechanism that grips the second flat plate and fixes the cutting machine to only one second flat plate of the steel member so that the direction of the rotation center axis of the cutting section faces the first flat plate. and a step of fixing the cutting machine to the steel member via an attachment having the attachment so that the direction of the rotation center axis of the cutting part faces the first flat plate, and 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 part. . [Effects of the Invention]

[0008] According to the present invention, additional machining can be easily performed on long steel members such as H-shaped steel members that are made up of flat plates whose short sides are perpendicular to each other. [Brief explanation of the drawings]

[0009] [Figure 1] 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; [Figure 2] FIG. 2 is an enlarged view of a cross section taken along line AA in FIG. 1, illustrating 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. [Figure 3]3 is a diagram showing the cutting machine as seen from the direction indicated by arrow B in FIG. 2. FIG. [Figure 4] FIG. 4 is an enlarged view of a cross section taken along line CC in FIG. 3. [Figure 5] 5 is a view showing a modified example of the attachment for a cutting machine according to the embodiment of the present invention, and is a cross-sectional view corresponding to FIG. 4. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An attachment for a cutting machine, a cutting machine, and a cutting method according to embodiments of the present invention will be described below with reference to the drawings.

[0011] First, with reference to FIG. 1, 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 will be described.

[0012] 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, an H-shaped steel member having a web portion 5 (first flat plate) and flange portions 3, 4 (second flat plates) arranged so that their short sides intersect approximately perpendicularly, such as the beam member 2 shown in Figure 1.

[0013] In the example shown in FIG. 1 , the column member 1 is a steel pipe column erected vertically, comprising 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 flanges 3, 4 and a web section 5 sandwiched between the pair of flanges 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 flanges 3, 4 to the web section 5.

[0014] The beam member 2 is fixed to the column member 1 by welding the lower flange 3 arranged vertically downward and the upper flange 4 arranged vertically upward to the diaphragm 1b, and by bolting or welding the web portion 5 to a gusset plate 1c provided on the column member 1.

[0015] In order to weld the lower flange 3 and the diaphragm 1b continuously along the width direction of the lower flange 3, a lower scallop 5a cut out in an approximately quadrant shape is formed in the web portion 5, and in order to weld the upper flange 4 and the diaphragm 1b continuously along the width direction of the upper flange 4, an upper scallop 5b cut out in an approximately quadrant shape is formed in the web portion 5.

[0016] Furthermore, in order to prevent stress from concentrating around the lower end of the lower scallop 5a and causing cracks in the lower flange 3 starting from this portion, the web portion 5 is provided with a reduced thickness portion 6, in which 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.

[0017] Here, the processing of the reduced thickness portion 6 in the web portion 5 must be performed on a relatively long beam member 2 having a pair of flange portions 3, 4 and a web portion 5, even before the beam member 2 is welded to the column member 1. Therefore, it is necessary to use large processing equipment such as a portal planer that can fix and process long members of several meters. For this reason, it would take a great deal of money and time to process the reduced thickness portion 6 in all beam members 2 used in a steel-framed building.

[0018] In addition, in existing steel-framed buildings, it is desirable to form a reduced-thickness section 6 in the web section 5 in order to prevent cracks from occurring in the beam member 2, but it is extremely difficult to accurately add the reduced-thickness section 6 to a beam member 2 that is welded to a column member 1.

[0019] In order to solve such problems, in this embodiment, a cutting machine 100 is attached to a beam member 2 (steel member) via a cutting machine attachment 10 having a configuration described below, so that even after the beam member 2 has been welded to the column member 1, it is possible to easily and accurately perform additional machining of reduced thickness portions 6, etc. on the web portion 5 (first flat plate) using the cutting machine 100.

[0020] Next, with reference to Figures 2 to 4, the configuration of a cutting machine attachment 10 (hereinafter referred to as "attachment 10") and the schematic configuration of a cutting machine 100 attached to a beam member 2 (steel member) via the attachment 10 will be described. Note that Figure 2 is an enlarged cross-section taken along line AA in Figure 1, showing the state in which the web portion 5 (first flat plate) is cut by the cutting machine 100 attached to the beam member 2 via the attachment 10, Figure 3 is a view showing 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 CC in Figure 3.

[0021] 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 moving unit 60 that can move the cutting unit 40 along a guide rail 13 (described below) that is provided on the attachment 10.

[0022] 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 a spindle 42, and is rotationally driven by the driving force of a drive unit 50 transmitted to the spindle 42 via a transmission mechanism 52 formed of a reduction gear or the like. The drive unit 50 may be an electric motor or a pressure motor.

[0023] The moving section 60 has a storage section 61 that accommodates the spindle 42 so that it can slide freely along the direction of the rotation center axis C1, and a sliding section 64 that has a rail section 65 that can be slidably inserted into a guide rail 13 (described below) that is provided on the attachment 10.

[0024] The position of the spindle 42 housed in the housing portion 61 is indirectly adjusted by a position adjustment portion 62 that can change the relative position of the transmission mechanism 52 with respect to the moving portion 60. By adjusting the position of the spindle 42 with respect to the housing portion 61 using the position adjustment portion 62 in this way, the depth of cutting by the cutting portion 40 can be set.

[0025] The rail portion 65 provided on the sliding portion 64 is a protrusion portion extending in a direction perpendicular to the direction of the rotation center axis C1 of the cutting portion 40, and its cross-sectional shape is an inverted figure eight that is inserted in a dovetail manner into the guide rail 13 described below provided on the attachment 10.

[0026] 3 and 4, the sliding part 64 is provided with a feed screw member 67 that threads into a female screw hole 14a formed in a protrusion 14 (described below) provided on the attachment 10 and has both ends rotatably supported, and a slide adjustment part 66 that adjusts the amount and direction of sliding of the sliding part 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 and the other end be an unsupported free end.

[0027] Since the cutting part 40 moves in accordance with the displacement of the sliding part 64 relative to the attachment 10, it is possible to adjust the direction and length in which the cutting part 40 cuts the material by adjusting the sliding direction and amount of sliding of the sliding part 64 using the slide adjustment part 66.

[0028] The attachment 10 used to attach the cutting machine 100 of the above configuration to the beam member 2 is a steel block body that includes 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 direction of the rotation center axis C1 of the cutting portion 40 of the cutting machine 100 faces the web portion 5 (first flat plate), as shown in Figures 2 to 4. The holding portion 12 is provided with a guide rail 13 that guides the cutting machine 100 so that it can move 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).

[0029] 2 and 4, when the attachment 10 is attached to the beam member 2, the guide rail 13 is a groove portion that extends along the longitudinal direction of the beam member 2, and its cross section is in an inverted figure-eight shape (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 joint manner.

[0030] 4, the holding part 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 screw hole 14a, into which a feed screw member 67 provided on the cutting machine 100 is threaded, is formed in the protrusion 14 so as to penetrate along the extension direction of the guide rail 13. The protrusion 14 is a member that 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).

[0031] The gripping mechanism is mainly composed of a pair of opposing portions 16, 17 (first opposing portion 16 and second opposing portion 17) that are provided opposite each other with the lower flange 3 (second flat plate) in between, and a plurality of fixing screw members 18 that are respectively screwed 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 screwed are formed to penetrate the second opposing portion 17 so that one end opens on the lower flange 3 side.

[0032] With the lower flange 3 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 against the lower flange 3, thereby gripping the lower flange 3 with the first opposing portion 16 and the fixing screw members 18. Note that the fixing screw members 18 are not limited to hexagonal bolts as shown in the figure, and may be any type of screw member with a flat tip, such as a hexagonal socket set screw, or a so-called hollow set screw.

[0033] Using the attachment 10 of the above configuration, which is capable of holding the cutting machine 100 and gripping the lower flange 3, the cutting machine 100 is attached to the beam member 2 with the rotation center axis C1 of the cutting part 40 facing the web part 5 to be processed, as shown in Figures 2 and 3.

[0034] 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 respectively screwed into a plurality of through holes 16a formed in the first opposing portion 16, with the tip of the screw abutting against the plate-like member 20.

[0035] The through holes 16a into which the screw members 21 are screwed are formed penetrating the first opposing portion 16 so that one end opens on the side of the lower flange 3, and 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, as shown in Figures 3 and 4. Specifically, the through holes 16a are formed at three locations along the longitudinal direction of the first opposing portion 16 and at three locations along the lateral direction, resulting in a total of nine locations. The through holes 17a into which the fixing screw members 18 are screwed are each formed so as to face the through hole 16a provided in the center of the first opposing portion 16 in the lateral direction.

[0036] Generally, the flange portion of a rolled H-section steel is provided with a slight slope, and in built H-section steel, a phenomenon known as umbrella bending occurs, in which the flange portion is slightly bent during welding.

[0037] 4, for example, when the lower flange 3, whose upper surface is slightly inclined along the short side direction, is simply gripped by the first opposing portion 16 and the fixing screw member 18, the rotation center axis C1 of the cutting part 40 becomes inclined with respect to the web part 5 (first flat plate). Specifically, the magnitude of the cutting angle θ formed between the direction of the rotation center axis C1 of the cutting part 40 and the surface of the web part 5 becomes larger than 90 degrees.

[0038] If cutting is performed in this manner with the rotation center axis C1 of the cutting portion 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 portion 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 constant thickness in the web portion 5.

[0039] In contrast to this, in this embodiment, as described above, multiple screw members 21 are provided in the first opposing portion 16. Therefore, for example, when the surface of the lower flange 3 is slightly inclined along the short direction as shown in Figure 4, by reducing the amount of protrusion toward the lower flange 3 of the screw member 21 located closest to the web portion 5, while increasing the amount of protrusion toward the lower flange 3 of the screw member 21 located farthest from the web portion 5, it is possible to adjust the magnitude of 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 be approximately 90 degrees, i.e., so that the direction of the rotation center axis C1 of the cutting portion 40 is perpendicular to the surface of the web portion 5.

[0040] 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.

[0041] In this way, the multiple screw members 21 screwed 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).

[0042] Furthermore, when the thickness of the plate-like 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-like 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-like member 20 is made, the closer the reduced thickness portion 6 is formed to the lower flange 3, and the thicker the plate-like member 20 is made, the farther the reduced thickness portion 6 is formed from the lower flange 3.

[0043] Therefore, by preparing multiple plate-like members 20 with different plate thicknesses and appropriately replacing the plate-like members 20, 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 size, and the reduced thickness portion 6 can be processed at the desired position of the web portion 5.

[0044] In this way, the plate-like member 20 functions as a distance adjusting portion that adjusts the distance between the lower flange 3 and the rotation center axis C1.

[0045] The distance between the lower flange 3 and the rotation center axis C1 can also be changed by changing the amount of protrusion of the plurality of screw members 21 provided in the first opposing portion 16 toward the lower flange 3. Therefore, instead of replacing the plate-like member 20, the height from the lower flange 3 to the rotation center axis C1 of the cutting portion 40 may be adjusted by changing the amount of protrusion of the plurality of screw members 21. In this case, the plurality of screw members 21 function as a distance adjustment portion.

[0046] The attachment 10 is also provided with an eyebolt 24 (hanging part) for hoisting the cutting machine 100 held by the holding part 12 together with the attachment 10 via a hoisting tool such as a chain block.

[0047] For example, it is expected that work at a high altitude will involve machining the reduced thickness portion 6 on a beam member 2 of an existing steel-framed building using the cutting machine 100 configured as described above. In such a case, by hanging the lower hook of a chain block, the upper hook of which is engaged with the column member 1 or the beam member 2, on the eyebolt 24, it is possible to lift the cutting machine 100 integrated with the attachment 10 to the work site relatively easily and to prevent the cutting machine 100 integrated with the attachment 10 from falling.

[0048] Next, a method for cutting the reduced thickness portion 6 in the beam member 2 using the attachment 10 and cutting machine 100 configured as described above will be described with reference to FIGS.

[0049] When the beam member 2 to be processed is a beam member 2 of an existing building, first, work is performed to remove covering materials such as fire-resistant covering 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, when the beam member 2 to be processed has not yet been joined to the 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.

[0050] 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 step). By fixing the cutting machine 100 to the beam member 2 via the attachment 10, the direction of the rotation center axis C1 of the cutting part 40 is oriented toward the web part 5.

[0051] When fixing the cutting machine 100 to the beam member 2, the position of the spindle 42 holding the cutting portion 40 is adjusted in advance by the position adjustment unit 62 to be the farthest position from the gripping mechanism so that the tip of the cutting portion 40 does not come into contact with the web portion 5.

[0052] 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 position of the rotation center axis C1 can be adjusted to an appropriate position by replacing the plate-shaped member 20, which is the distance adjustment portion, with one of a different thickness, or by changing the amount of protrusion toward the lower flange 3 of the multiple screw members 21 provided on the first opposing portion 16.

[0053] Furthermore, when the direction of the rotation 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 is adjusted to be 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.

[0054] Once it is confirmed that the cutting machine 100 is securely fixed to the beam member 2, the cutting unit 40 starts cutting the web portion 5.

[0055] Specifically, cutting unit 40 is rotated by the driving force of drive unit 50, and position adjustment unit 62 is adjusted to move spindle 42 toward web portion 5 so that the tip surface of rotating cutting unit 40 comes into contact with the surface of web portion 5. Then, position adjustment unit 62 is adjusted so that the depth cut by cutting unit 40 becomes the preset depth of reduced thickness portion 6, and spindle 42 is further moved toward web portion 5. This causes cutting unit 40 to start cutting web portion 5.

[0056] Next, in order 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 portion 40 is in contact with the web portion 5 (moving cutting process).

[0057] 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 on the surface of the web portion 5 along the longitudinal direction by the cutting unit 40.

[0058] Through the above steps, the reduced thickness portion 6 is additionally machined on the web portion 5 of the beam member 2 by the cutting machine 100.

[0059] 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 can 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, and then the above-mentioned process can be repeated to form a reduced thickness portion 6 of the desired width.

[0060] In addition, if the beam member 2 is a built H-shaped steel beam 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 over the range where the reduced thickness portion 6 will be formed, and then the reduced thickness portion 6 may be formed in the web portion 5.

[0061] According to the above embodiment, the following effects are achieved.

[0062] According to 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 that includes a holding portion 12 having a guide rail 13 that guides the cutting machine 100 movably 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.

[0063] Therefore, 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, it is possible to easily machine the reduced thickness part 6 into the web part 5. This makes it possible to easily perform additional machining on long steel members made up of flat plates whose short sides are perpendicular to each other, such as H-shaped steel members.

[0064] Furthermore, with the above configuration, even when the cutting machine 100 is used for work at a height, 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, the installation of the cutting machine 100 and the cutting process can be completed manually in a short time without using heavy machinery, thereby shortening the construction period and reducing the cost required for additional work on the beam member 2 or the like.

[0065] The following modified examples are also within the scope of the present invention, and it is possible to combine the configuration shown in the modified example with the configuration described in the above embodiment, or to combine the configurations described in the different modified examples below.

[0066] In the above embodiment, the plurality of screw members 21 screwed into the plurality of through holes 16a formed in the first opposing portion 16 function as the tilt adjustment portion. Alternatively, or in addition to this, 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 Fig. 5. Fig. 5 is a view showing a cross section corresponding to Fig. 4.

[0067] In the modification 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 and a second flat surface 120b on the first opposing portion 16 side that are not parallel to each other, 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 a plurality of plate-like members 120 with different intersection angles α and replacing the plate-like member 120 according to 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). Note that fine adjustment of the inclination is preferably performed by adjusting the protrusion amount of the screw member 21 described above.

[0068] Furthermore, in the above embodiment, the steel member to which the cutting machine 100 is attached via the attachment 10 is an H-beam. The member to be machined by the cutting machine 100 is not limited to an H-beam, and may be a steel material of any shape 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 thereof are approximately perpendicular to each other, and may be, for example, an angle iron 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.

[0069] In the above embodiment, the processing performed by the cutting machine 100 on the web portion 5 is groove processing. The processing performed by the cutting machine 100 is not limited to groove processing, and may be processing of through holes or elongated holes that penetrate the web portion 5, or may be processing of lower scallops 5a or upper scallops 5b, for example.

[0070] 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 the cutting machine 100 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.

[0071] Furthermore, in the above embodiment, the attachment 10 grips the lower flange 3 (second flat plate) with 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 mechanism that grips the lower flange 3 by simply narrowing the gap between a pair of opposing members, such as a vice or a clamp.

[0072] Although the embodiments of the present invention have been described above, the above embodiments merely illustrate some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above embodiments. [Explanation of symbols]

[0073] 10. Cutting machine attachment 100...cutting machine 2... Beam member (steel member) 3. Lower flange (second flat plate) 5. Web section (first flat plate) 6...Reduced thickness section 12...Holding part 13 Guide rail 15... Fixed part 16...First opposing part (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 part) 21 Screw member (tilt adjustment part, distance adjustment part) 24 Eye bolt (hanging part) 40...Cutting part 50 Drive unit 60 Moving part 120 Plate-shaped member (tilt adjustment portion) 120a...1st plane 120b...2nd plane C1: Central axis of rotation

Claims

1. 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, the attachment being configured to attach a cutting machine to the steel member, the cutting machine performing 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 unit 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 unit 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. 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.

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