JP2019198929A - Square box column manufacturing method - Google Patents

Abstract

To provide a method for manufacturing a square box column by which a long hole for a welding work for electroslag welding which is performed in a square box column manufacturing process can be formed with good accuracy and with labor saving without requirement for a gas fusion cutting process.SOLUTION: A square box column manufacturing method 1 comprises: a reference hole formation process in which a first reference hole 3 which penetrates a thick plate 2, and a second reference hole 4, which is provided at a position separated from the first reference hole 3, has a hole diameter same as that of the first reference hole 3, and penetrates the thick plate 2, are respectively formed; and a plunge processing process S2 in which a region R between the first reference hole 3 and the second reference hole 4 is removed by a plunge cutter 20, and a long hole, which communicates the first reference hole 3 and the second reference hole 4 with each other, is formed.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for manufacturing a square box column. More specifically, it is constructed by combining four steel planks and is mainly used as a column member for large buildings, etc. The present invention relates to a method of manufacturing a square box column for providing a long hole for welding work to be performed.

  Conventionally, various large buildings and structures such as buildings such as high-rise buildings and sports competition facilities, piers such as highways and iron bridges, large ships such as tankers, large passenger ships, and cargo ships are constructed or constructed. To be done. When building these large buildings and structures (hereinafter referred to as “large buildings, etc.”), a steel plate (skin plate) is combined as a pillar member to be the main skeleton. Many built structural materials called square box pillars are used. The square box column has a space surrounded by four thick plates inside, presents a square tube (or square tube), and has various strengths as a member excellent in high strength and high load resistance. Has been implemented in the field.

  Hereinafter, the configuration of the square box column will be specifically described. For example, as shown in FIGS. 8 to 10, the square box column 100 includes a pair of steel vertical plates 101 a and 101 b that are spaced apart from each other, and steel that is connected to the vertical plates 101 a and 101 b, respectively. It has a pair of horizontal plates 102a and 102b, and is constructed by connecting the side sides of the vertical plates 101a and 101b and the side sides of the horizontal plates 102a and 102b and combining them into a rectangular tube shape. Here, the vertical plate 101a or the like corresponds to a “thick plate (flange)”, and the horizontal plate 102a or the like corresponds to a “thick plate (web)”. For example, “submerged arc welding” is used to join the connecting portions (corners) of the side edges of the vertical plates 101a and 101b and the horizontal plates 102a and 102b.

  A space S surrounded by the vertical plate 101a and the horizontal plate 102a and the like exists inside the square box column 100 having a rectangular cylindrical shape. Therefore, when a strong load is applied to the square box column 100 from, for example, the horizontal direction (the direction orthogonal to the vertical plate 101a or the like), the space S is crushed, and a part of the vertical plate 101a and the horizontal plate 102a or the like is formed. There was a possibility of bending or deformation. Therefore, for the purpose of improving the strength such as the load resistance of the square box column 100, a plurality of reinforcing materials (diaphragm 104) are predetermined in the space S so as to substantially block the cross-sectional direction of the square box column 100. Inserted at intervals. Thereby, even if the above strong load is applied to the square box column 100, the plurality of diaphragms 104 can prevent problems such as deformation of the vertical plate 101a and the like. Therefore, the load resistance and the like of the square box column 100 are further improved, and high safety can be secured and widely used as a column member of a large building or the like.

  Here, the diaphragm 104 used as a reinforcing material is a substantially rectangular plate-like member that has a predetermined thickness and substantially matches the cross-sectional shape of the space S inside the square box column 100. Like 101a etc., it is comprised with the steel board. Then, the diaphragm 104 is disposed by welding the inner surface 103 disposed in the space S inside the square box column 100 and facing the space S such as the vertical plate 101 a and the horizontal plate 102 a and the side edge 105 of the diaphragm 104. Are joined and fixed to the vertical plate 101a or the like (see, for example, Patent Document 1).

  Note that the diaphragm 104 used as a reinforcing material may have, for example, a circular punched hole 109 at the center (see FIG. 8). Even if the punched hole 109 is provided, the function as a reinforcing material can be sufficiently exhibited. Furthermore, after the square box column 100 is installed as a column member in a part of a large building, a concrete material is poured into the space S inside the square box column 100 and then solidified, so that the square box column 100 is solidified. Column members filled with concrete may be constructed. The space S inside the square box column 100 partitioned by a plurality of diaphragms 104 can be communicated by the punching hole 109, which has the advantage of facilitating the pouring of concrete material. When the concrete material filled in the internal space S is completely solidified, the mechanical characteristics such as load resistance of the square box column 100 can be further improved.

  Here, when the diaphragm 104 is fixed to the square box column 100, for example, a pair of vertical plates 101a and 101b and a pair of horizontal plates 102a and 102b are temporarily welded to prepare a temporary assembly 110 temporarily assembled into a rectangular tube shape. (See FIG. 9). The inner surfaces 103 of the vertical plate 101a and the horizontal plate 102a and the side 105 of the diaphragm 104 are each welded by “electroslag welding”.

  In order to perform electroslag welding, a predetermined gap 106 is provided between the inner surface 103 of the vertical plate 101a or the like (or the horizontal plate 102a or the like) and the side edge 105 of the diaphragm 104, and a welding torch (shown in the figure) is provided. No.) and the welding layer 107 must be formed between the inner surface 103 and the side edge 105 by gradually pulling out the torch from the gap 106 while welding. Finally, the vertical plate 101a or the like (or the horizontal plate 102a or the like) and the welded layer 107 formed with a uniform width between the diaphragm 104 provide a strong space between the vertical plate 101a and the diaphragm 104. (See FIG. 10).

  The diaphragm 104 before the electroslag welding is attached to the inner surface 103 of the vertical plate 101a or the like between a pair of contact plates 108 spaced apart from each other at an interval substantially equal to the width of the diaphragm 104 (for example, FIG. 9). reference). Therefore, in the temporarily assembled temporary assembly 110 as described above, the “hole H” for welding work for allowing the tip of the welding torch to enter the temporary assembly 110 is provided with the vertical plate 101a or the like (or the horizontal plate). Drilling is required in the plate 102a and the like. Here, for drilling the hole H, for example, equipment such as a well-known gantry-type drilling device is mainly used.

  A gap 106 between the vertical plate 101a and the like for electroslag welding and the side 105 of the diaphragm 104 is generally in a horizontally long shape in cross-sectional view. That is, in electroslag welding, it is necessary to form the weld layer 107 while moving the tip of the welding torch in the lateral direction. Therefore, the hole H to be drilled for welding work also needs to be a horizontally long long hole in accordance with the shape of the gap 106.

  However, the above-described piercing with the gantry-type drilling device can only make a circular through hole corresponding to the drill diameter. Therefore, another process has been performed in order to form the long hole (hole H). For example, after a pair of circular reference holes are provided in the vertical plate 101a or the like using a gantry-type punching device (reference hole forming step), the gas that removes the region between the reference holes by gas fusing A fusing process was performed. Thereby, the oblong long hole which a pair of reference hole connected can be formed.

Japanese Patent Laid-Open No. 7-1148

  As shown above, the hole provided for electroslag welding needs to be a long hole, and there is a gap between the reference hole and the reference hole forming step for forming a pair of reference holes using a gantry type drilling device. Two steps of a gas fusing step for gas fusing were necessary.

  The reference hole forming step can be automated by programming control according to values previously input as data. However, the gas fusing process is often performed manually by a skilled engineer and often takes a long time. In particular, since it is necessary to form the long holes at a plurality of locations for one rectangular column box column, there is a tendency to place a lot of work burden on the engineer and to further increase the work time.

  In addition, in recent years, the number of skilled engineers who can perform gas fusing is insufficient, and there has been a problem in securing engineers. In particular, in the case of an engineer who has little experience in gas fusing, the working time tends to be longer in the gas fusing process. In addition, problems such as the case where the processing accuracy due to gas fusing may not be stable may occur. Therefore, without carrying out the gas fusing step, it is possible to carry out a horizontally long drilling work for the square box column, labor saving work, shortening the work time, and automatization technology, The development of drilling technology that can maintain stable machining accuracy was expected.

  Therefore, in view of the above circumstances, the present invention provides stable machining accuracy without requiring a gas fusing step for a long hole for welding work for electroslag welding performed in the manufacturing process of a square box column. It is an object of the present invention to provide a method for manufacturing a square box column that can be maintained and can be shortened and automated.

  According to this invention, the manufacturing method of the square box pillar which solved the said subject is provided.

[1] A square box column manufacturing method for forming a long hole for welding work on a thick plate constituting a square box column, the first reference hole penetrating the thick plate, and the first reference hole A reference hole forming step for forming a second reference hole that is provided at a position apart from the first reference hole and penetrates the thick plate having the same hole diameter as the first reference hole, and the first reference hole and the second reference hole A square box column manufacturing method comprising: a plunge processing step in which a gap is removed by a plunge cutter to form a long hole in which the first reference hole and the second reference hole are communicated.

[2] A cutter center of the plunge cutter is moved from the first hole center to the second hole center along a virtual line connecting the first hole center of the first reference hole and the second hole center of the second reference hole. The manufacturing method of the square box pillar as described in said [1] which further comprises the cutter movement process made to approach stepwise toward.

[3] A method of manufacturing a square box column for forming a long hole for welding work on a thick plate constituting the square box column, a reference hole forming step of forming a reference hole penetrating the thick plate;
A plunge processing step of removing the thick plate around the reference hole by a plunge cutter along a predetermined direction from the hole center of the reference hole to form a long hole including the reference hole; Production method.

[4] The method according to [3], further including a cutter moving step in which the cutter center of the plunge cutter is gradually separated from the hole center along a virtual line extending in a predetermined direction from the hole center of the reference hole. Manufacturing method of square box column.

[5] In the reference hole forming step, a gantry type drilling device equipped with a drill for drilling the first reference hole and the second reference hole is used. The manufacturing method of the square box pillar in any one of said [1]-[4] in which the said gantry type | mold drilling apparatus replaced | exchanged for the cutter is used.

[6] The method for manufacturing a square box column according to [5], further including a bead removing step of removing the bead after electroslag welding using a milling tool attached to the gantry type drilling device.

  According to the method for manufacturing a square box column of the present invention, a long hole for electroslag welding (long hole) for constructing a square box column can be stably stably with high accuracy without requiring a gas fusing step. And at a low cost.

It is explanatory drawing which shows an example of the temporary assembly used as the object of the gantry type | mold drilling apparatus used for the manufacturing method of the square box pillar which is one Embodiment of this invention, and a drilling process. It is explanatory drawing which shows typically the 1st reference hole and the 2nd reference hole which were pierced by the thick board. FIG. 3 is a schematic cross-sectional view of FIG. 2. It is a schematic cross section which shows a plunging process. It is explanatory drawing which shows after completion | finish of the 1st plunge process. It is a schematic cross section of FIG. It is explanatory drawing which shows typically the state after completion of a drilling process. It is a perspective view which shows schematic structure of a square box pillar. It is a front view which shows schematic structure of a temporary assembly. It is sectional drawing which shows schematic structure of the square box column after welding of a diaphragm.

  Hereinafter, the manufacturing method of the square box pillar of this invention is explained in full detail, referring drawings. Here, the manufacturing method of the square box column of the present invention is not limited to the following embodiments, and various design changes, modifications, improvements, and the like can be added without departing from the scope of the present invention. Is.

1. Method for Producing Square Box Column A method 1 for producing a square box column (hereinafter simply referred to as “manufacturing method 1”) according to an embodiment of the present invention is performed in a manufacturing process for constructing a square box column, A long hole LH for welding work for fixing a reinforcing diaphragm inserted into the work W (temporary assembly) combined with the thick plate 2 (vertical plate and horizontal plate) by electroslag welding (FIG. 7). Reference). The square box column, the temporary assembly, and the diaphragm have basically the same configurations as those shown in FIGS.

  The manufacturing method 1 will be described more specifically. The manufacturing method 1 is provided at a position spaced from the first reference hole 3 that penetrates the thick plate 2 and the first reference hole 3, and penetrates the thick plate 2. The first reference hole 3 is removed by a plunge cutter 20 (see FIG. 4) between the reference hole forming step S1 for forming the second reference holes 4 to be performed, and the first reference hole 3 and the second reference hole 4 penetrating therethrough. And a plunging step S2 for forming a horizontally elongated hole (long hole LH (see FIG. 7)) in communication with the second reference hole 4. Here, the thick plate 2 is also referred to as a skin plate, and is configured as a pair of vertical plates (flange) and a pair of horizontal plates (web). The first reference hole 3 and the second reference hole 4 are formed with the same hole diameter.

  Here, the reference hole forming step may form only one reference hole penetrating the thick plate 2, in other words, only the first reference hole 3. Further, in the plunge processing step, the space between the first reference hole 3 and the second reference hole 4 is not removed by the plunge cutter 20, but the reference is made along the predetermined direction from the hole center of one reference hole. The thick plate around the hole may be removed to form a long hole including the reference hole.

  That is, when the length of the long hole for welding work for performing electroslag welding is short, it is not necessary to form a pair of reference holes (the first reference hole 3 and the second reference hole 4). Only the reference hole may be formed. Thereby, it is not necessary to provide two reference holes, and the working time can be shortened. In the following description, the first reference hole 3 and the second reference hole 4 provided on the thick plate 2 will be described as an example unless otherwise specified.

  Furthermore, the manufacturing method 1 of the present embodiment may include a weld bead removing step of removing the weld bead 112 (see FIG. 10) after electroslag welding. That is, as shown in FIGS. 9 and 10, the gap 106 formed between the inner surface 103 such as the vertical plate 101 a and the side edge 105 of the diaphragm 104 is welded through the hole H formed in the thick plate 2. The torch (not shown) is entered and the torch is gradually pulled out from the gap 106 while performing welding (electroslag welding), whereby the weld layer 107 filled in the gap 106 is formed. At this time, as shown in FIG. 10, a weld bead 112 that is a portion protruding (or protruding) from the outer surface 111 such as the vertical plate 101 a remains in a part of the weld layer 107.

  Therefore, the weld bead 112 that is a part of the weld layer 107 protruding from the outer surface 111 is removed by the weld bead removing step. Here, the welding bead removal process can use, for example, a drill unit 14 (details will be described later) of the gantry type drilling apparatus 10 described later provided with a milling tool such as an end mill. Thereby, the removal (gouging or fishing) operation of the weld bead 112 can be automated. Therefore, work efficiency can be made better by shortening the removal time of the weld bead 112 mainly performed manually, and reducing work man-hours.

2. Gantry type punching device In the manufacturing method 1 described above, the reference hole forming step S1 and the plunging step S2 are each a gantry type punching device 10 (hereinafter, simply referred to as a “piercing device 10”), which is a well-known punching device. (See FIG. 1). Here, the punching device 10 is mainly configured to include a mounting table 11, a pair of X-axis guide rails 12a and 12b, a gantry unit 13, a drill unit 14, and the like.

  The punching device 10 will be described in more detail. The mounting table 11 of the punching device 10 includes an X axis (corresponding to the left and right direction of the paper in FIG. 1) and a Y axis perpendicular to the X axis (corresponding to the vertical direction of the paper in FIG. 1). ) Is defined, and is placed on the upper surface of the placement table 11 in a state where the longitudinal direction of the workpiece W is placed horizontally along the X axis. Although the size of the workpiece W is not particularly limited, since it is a steel square box column that becomes a column member as a final product as described above, for example, a workpiece having a width of about 200 mm to 1500 mm is used. In some cases, the length exceeds several tens of meters. Therefore, in order to stably support the elongated body and the heavy workpiece W in the horizontal direction from the lower side, the mounting table 11 needs to have a robust structure. Thereby, the workpiece | work W is mounted in the mounting table 11 in the state which made the horizontal longitudinal direction correspond, without bending by dead weight.

  Along the X axis (see FIG. 1) of the placement table 11 and the Y axis (see FIG. 1) perpendicular to the X axis at an arbitrary position of the workpiece W to be drilled and processed on the placement table 11. Then, the gantry unit 13 and the drill unit 14 are rolled, and a drilling drill (not shown) attached to the drill unit 14 can be adjusted to the drilling position. Thereafter, the drill unit 14 is moved in the Z-axis direction (corresponding to the depth direction of the paper in FIG. 1 or see FIG. 4) perpendicular to the X-axis and Y-axis while the drill drill is rotated. A first reference hole 3 and a second reference hole 4 can be formed in the plate 2 (see FIG. 2). Note that the rolling of the gantry unit 13 and the drill unit 14 and the operation of the drill unit 14 can be performed by using various well-known drive means (not shown) such as drive motors and gears. Moreover, the rolling position of the gantry unit 13 and the drill unit 14, in other words, the drill position of a drilling drill or the like can be accurately moved to an arbitrary position by programmed numerical control. Furthermore, the number of rotations and feed speed of the drill drill by the drill unit 14 can be arbitrarily controlled. Moreover, a well-known thing can be used for the drill used for drilling the 1st reference | standard hole 3 grade | etc.,. That is, the processing method of the present invention can divert the equipment that has been used conventionally, and does not require new equipment costs.

  FIG. 2 is an enlarged sectional view of the first reference hole 3 and the second reference hole 4 drilled in the thick plate 2 (work W) as viewed from above. Here, FIG. 2 shows a certain range around the first reference hole 3 and the like, and the two-dot chain line in FIG. 2 does not show the boundary of the thick plate 2 (hereinafter, FIG. 3 and FIG. 4). , FIG. 5, FIG. 6, and FIG. 7).

  Further, the drilling device 10 can perform the plunge processing step S2 by exchanging the drill drill attached to the drill unit 14 with the plunge cutter 20. Here, in the plunge machining step S2 (plunge machining), the plunge cutter 20 provided with the cutting edge 21 at the tip is moved along the vertical direction (Z-axis direction: see FIG. 4) with respect to the thick plate 2. Thus, the thick plate 2 can be cut. Here, the plunge cutter 20 itself is a well-known one, and an existing plunge cutter can be used. Moreover, the cutting conditions of the thick plate 2 by the plunge processing step S2 can be arbitrarily set. For example, the manufacturing method 1 of the present embodiment uses a plunge cutter 20 in which a pair of cutting blades 21 are arranged at the front end at a distance of 180 ° from each other.

  In addition, since the drilling device 10 has a configuration related to the gantry unit 13 and the drill unit 14 that can freely roll along the X-axis direction and the Y-axis direction, the first drilling device 10 already provided in the thick plate 2 is provided. The cutter center 20c of the plunge cutter 20 can be moved by programmed numerical control along a virtual line L connecting the first hole center 3c of the reference hole 3 and the second hole center 4c of the second reference hole 4 (cutter Movement process S3). Furthermore, the movement of the plunge cutter 20 is programmed so as to bring the cutter center 20c closer in a stepwise manner from the first hole center 3c toward the second hole center 4c.

  Here, the moving distance of the plunge cutter 20 in the cutter moving step S3 can be arbitrary. For example, it is possible to perform numerical control such that the first hole center 3c is moved in steps of 5 mm along the virtual line L from the first hole center 3c. Accordingly, the region R (see FIG. 2 and the like) between the first reference hole 3 and the second reference hole 4 is finally removed by repeating the plunge processing step S2 and the cutter moving step S3 a plurality of times. A long hole LH in which the reference hole 3 and the second reference hole 4 communicate with each other can be formed. This completes the drilling process. Here, in FIG. 2, the region R cut off by the plunge machining S2 is shown hatched.

  The moving distance of the plunge cutter 20 in the cutter moving step S3 is not limited to the distance between the first hole center 3c and the second hole center 4c, as shown above. For example, when the first plunge processing step S2 is performed with the first reference hole 3 and the second reference hole 4 opened in the thick plate 2 (see FIG. 2), the cutter from the first hole center 3c The movement distance L1 (see FIG. 5) of the center 20c may be set wider than the movement distance L2 or the like (details will be described later) in the second and subsequent plunging steps S2.

  By cutting the thick plate 2 in the plunge machining step S2, swarf (chips) or the like scraped by the plunge cutter 20 is inevitably generated. At this time, in the case of the first plunge processing step S2, the cutter outer periphery of the plunge cutter 20 and the hole wall of the first reference hole 3 (outside from the first hole center 3c: corresponding to the left side in FIG. 4). The gap may be narrow. Therefore, the shaved chips are not discharged to the outside of the thick plate 2 and may be caught between the plunge cutter 20 and the hole wall of the first reference hole 3. As a result, smooth rotation of the plunge cutter 20 may be impaired, and the stable plunge processing step S2 may not be performed.

  Therefore, the above-mentioned problem can be solved by setting the movement distance L1 of the first plunging process S2 to be larger than that of the subsequent plunging process S2. As a specific example, the movement distance L1 (distance of the cutter center 20c from the first hole center 3c) in the first plunging process S2 is set to 6.5 mm, and the movement of the plunging process S2 from the second time onward. The distance L2 and the like (the distance between the cutter centers 20c before and after the movement) can be set to 5 mm. That is, the moving distance L1 in the first plunging process S2 can be set wider than the moving distance L2 in the subsequent plunging process S2. Thereby, possibility that the said malfunction that a chip | tip will pinch will arise can be restrained low.

3. Specific Example of Processing Method Hereinafter, details of processing of the long hole LH for the thick plate 2 (work W) by the manufacturing method 1 of this embodiment will be described. First, using the drilling device 10, the first reference hole 3 penetrating the workpiece W (thick plate 2) is drilled at a predetermined drilling position by a drill drill attached to the drill unit 14. Here, the drilling position of the first reference hole 3 is preliminarily input to the drilling device 10, and numerical control by programming based on the data is performed to move the gantry unit 13 and the drill unit 14 in the X-axis direction and Rolling freely along the Y-axis direction is controlled so that the drill center of the drilling drill reaches the drilling position.

3.1 Reference Hole Forming Step After the gantry unit 13 and the drill unit 14 are rolled, control is performed so that the drill center of the drilling drill is positioned at a predetermined drilling position, and then the drilling mounted on the drill unit 14 Start driving the drill. The drilling drill is controlled to descend along the Z-axis direction (see FIG. 4) while rotating the drill part (not shown) at the tip at a preset number of rotations.

  A drill drill that has been lowered while the drill portion is rotated at a predetermined number of revolutions finally comes into contact with the thick plate 2 at the tip of the drill portion, and further descends so that a portion of the thick plate 2 becomes circular. Scraped off. As a result, the first reference hole 3 penetrating the thick plate 2 is formed. The drilling drill after forming the first reference hole 3 is raised (corresponding to the reverse Z-axis direction) by the control of the drill unit 14 and returned to the initial position before the reference hole forming step S1.

  Next, the gantry unit 13 and the drill unit 14 are again rolled along the X axis and the Y axis, and the drill center of the drilling drill is moved to the drilling position of the second reference hole 4 specified in advance. The details of the formation of the second reference hole 4 are the same as the formation of the first reference hole 3, and thus detailed description thereof is omitted. At this time, the second reference hole 4 has a drilling position set at a position separated from the first reference hole 3 by a predetermined distance. Furthermore, since the first reference hole 3 and the second reference hole 4 are perforated by a series of flows using the perforating apparatus 10, the first reference hole 3 and the second reference hole 4 naturally have the same hole diameter. It is formed. This completes the formation of a pair of reference holes 3 and 4 having the same hole diameter, which are arranged in parallel with the thick plate 2 at a predetermined interval (reference hole forming step S1). In the manufacturing method 1 of the present embodiment, the drill diameter of the drill is selected so that the diameters of the first reference hole 3 and the second reference hole 4 are each 28 mm.

  When the reference hole forming step S1 is completed, a region R (see hatching in FIG. 2) to be removed by the plunging step S2 exists between the first reference hole 3 and the second reference hole 4. FIG. 3 schematically shows a cross-sectional view of FIG. 2 viewed from the side. In addition, when the length of the long hole LH formed as already demonstrated is comparatively short, formation of the 2nd reference hole 4 with respect to the thick board 2 can be abbreviate | omitted in the said reference hole formation process S1. That is, the working time required for the reference hole forming step S1 can be shortened, and the working efficiency can be improved.

3.2 Plunge processing step and cutter moving step S3
Next, the drilling drill provided at the tip of the drill unit 14 of the drilling device 10 is changed to a plunge cutter 20 for plunge processing. Since the details of the plunge cutter 20 have already been described, the description thereof is omitted here. Moreover, in the manufacturing method 1 of this embodiment, the cutter diameter of the plunge cutter 20 is selected to be 25 mm. That is, the hole diameter formed by plunge processing is set smaller than the hole diameters (= 28 mm) of the first reference hole 3 and the second reference hole 4 described above.

  Using the exchanged punching device 10 for the plunge cutter 20, the gantry unit 13 and the drill unit 14 are controlled again, and the first hole center 3 c of the first reference hole 3 and the second hole center 4 c of the second reference hole 4 are set. The plunge cutter 20 is moved so that the cutter center 20c is located on the connected virtual line L and spaced from the first hole center 3c by a predetermined interval (position close to the second hole center 4c). Let

  Here, in the manufacturing method 1 of the present embodiment, in order to perform the first plunging process S2, the cutter center 20c is positioned on the imaginary line L separated by 6.5 mm from the first hole center 3c. Is set to That is, as already described, the moving distance L1 of the plunge cutter 20 is set to 6.5 mm (see FIG. 7). The movement of the plunge cutter 20 (cutter center 20c) (cutter moving step S3) is performed in accordance with programming control of the gantry unit 13 and the drill unit 14 based on values previously input to the punching device 10. It can be moved to a position. That is, it is possible to automatically control up to the processing position for plunge processing.

  After the plunge cutter 20 has moved to a predetermined position, the drill unit 14 is driven and the plunge cutter 20 is rotated. Then, by moving the plunge cutter 20 downward (Z-axis direction), a part of the region R including the hole wall of the first reference hole 3 is scraped off by the cutting edge 21 of the plunge cutter 20 (cutting process ( Plunge processing)). For example, as shown in FIG. 4, the plunge machining step S <b> 2 includes a cutting edge 21 provided at the tip of the plunge cutter 20 that is perpendicular to the thick plate 2, so that the cutting edge 21 can increase the thickness. A part of the plate 2 is scraped off along the depth direction (Z-axis direction). Here, in the manufacturing method 1 of the present embodiment, the cutting speed of the plunge cutter 20 (main shaft rotational speed) is set to 1000 rpm, and the feed speed (downward speed) in the Z-axis direction is set to 340 mm / min. The plunge processing step S2 is performed.

  In the manufacturing method 1 of the present embodiment, as described above, since the pair of cutting edges 21 are provided at the tip, the cutting rate by one cutting edge 21 is 0.17 mm, and the feed rate per minute is calculated. ing.

  By completing the first plunging step S2, a part of the region R between the first reference hole 3 and the second reference hole 4 is removed (see FIGS. 5 and 6). In other words, a hole H1 having a hole area slightly larger than the first reference hole 3 is formed by the first plunging process S2.

  Thereafter, the punching device 10 is controlled, and the cutter center 20c of the plunge cutter 20 is stepped to a position further away from the first hole center 3c (position closer to the second hole center 4c) than the first plunge processing step S2. The plunge cutter 20 is moved. Here, in the manufacturing method 1 of the present embodiment, in the second and subsequent plunging steps S2, the movement distances L2, L3, L4, L5, and L6 of the cutter center 20c before and after the movement are 5 mm, respectively. (See FIG. 7). That is, the second and subsequent plunging steps S2 are set so that the cutter center 20c approaches the second hole center 4c in steps of 5 mm.

  The process is repeated until the hole H1 having a larger hole area than the first reference hole 3 communicates with the second reference hole 4 by the plunging process by the plunging process S2 and the movement of the plunging cutter 20 by the cutter moving process S3. Thereby, a horizontally long hole (long hole LH) communicating between the first reference hole 3 and the second reference hole 4 is finally formed (see FIG. 7). As shown in FIG. 7, since the cutter diameter (= 25 mm) of the plunge cutter 20 is set smaller than the hole diameter (= 28 mm) of the first reference hole 3 and the second reference hole 4, the final The elongated hole LH obtained in (1) has a slightly narrower central portion.

  As shown in FIG. 7, the first reference hole 3 and the second reference hole 4 communicate with each other, so that the tip of the torch for performing electroslag welding has an air gap 106 (in the horizontal direction in FIG. 4). The welding layer 107 (see FIG. 10) can be formed with high accuracy. As already described, when the second reference hole 4 is not provided in the reference hole forming step S1, the above-described processing by the plunge cutter 20 is performed in a predetermined direction from the hole center of the reference hole (not shown) along a predetermined direction. It may be performed by moving the cutter center of the cutter 20. In this case, the moving distance of the cutter center 20c of the plunge cutter 20 relative to the hole center of the reference hole, the cutter diameter of the plunge cutter, or the like can be arbitrarily set as described above.

  Furthermore, according to the manufacturing method 1 of this embodiment, the drilling device 10 used in the reference hole forming step S1 and the plunging step S2 can be used in the weld bead removing step for removing the weld bead 112. That is, a known milling tool can be attached to the drill unit 14 of the drilling device 10 to remove the weld bead 112. Thereby, the work efficiency which concerns on manufacture of a square box pillar can be made more favorable.

  As described above, according to the manufacturing method 1 of the present embodiment, the first reference hole 3 and the second reference hole 4 are obtained by using the plunge cutter 20 and repeating the plunge processing step S2 and the cutter moving step S3 a plurality of times. The long holes LH communicated with each other can be formed. In particular, if data relating to a drilling position or the like is input to the punching device 10 in advance, the reference hole forming step S1, the plunge machining step S2, and the cutter moving step S3 are automatically performed on the thick plate 2. Can do. Therefore, it is possible to shorten the work time for machining the long hole for the square box column, and it is possible to perform the work while maintaining the work cost and the stable work accuracy. In particular, since the conventional gas fusing step is not required, problems caused by a shortage of skilled engineers can be solved, and variations in processing accuracy do not occur.

  According to the manufacturing method of the square box column of this invention, it can be used especially useful in the manufacturing process of the square box column used as a building structural member.

1: Processing method (square box column manufacturing method) 2: Thick plate 3: First reference hole 3c: First hole center 4: Second reference hole 4c: Second hole center 10: Drilling device (Gantry drilling device), 11: mounting table, 12a, 12b: X-axis guide rail, 13: gantry unit, 14: drill unit, 20: plunge cutter, 20c: center of cutter, 21: cutting edge, 100: square Box pillar, 101a, 101b: vertical plate, 102a, 102b: horizontal plate, 103: inner surface, 104: diaphragm, 105: side, 106: gap, 107: weld layer, 108: contact plate, 109: punched hole, 110 : Temporary assembly, 111: Outer surface, 112: Weld bead, H, H1: Hole, L: Virtual line, L1, L2, L3, L4, L5, L6: Movement distance, LH: Long hole, R: Region, S : Space, S1 Reference hole forming step, S2: plunging step, S3: cutter moving step, W: workpiece.

Claims (6)

A square box column manufacturing method for forming a long hole for welding work on a thick plate constituting a square box column,
A first reference hole that penetrates the thick plate and a reference that is provided at a position spaced from the first reference hole and that forms a second reference hole that penetrates the thick plate having the same hole diameter as the first reference hole. A hole forming step;
A square box column comprising a plunging step of removing a space between the first reference hole and the second reference hole by a plunge cutter to form a long hole in communication with the first reference hole and the second reference hole. Manufacturing method.   A cutter center of the plunge cutter is directed from the first hole center to the second hole center along a virtual line connecting the first hole center of the first reference hole and the second hole center of the second reference hole. The manufacturing method of the square box pillar of Claim 1 which further comprises the cutter movement process made to approach in steps. A square box column manufacturing method for forming a long hole for welding work on a thick plate constituting a square box column,
A reference hole forming step of forming a reference hole penetrating the thick plate;
A plunge processing step of removing the thick plate around the reference hole by a plunge cutter along a predetermined direction from the hole center of the reference hole to form a long hole including the reference hole; Production method.   4. The square box column according to claim 3, further comprising a cutter moving step in which a cutter center of the plunge cutter is gradually separated from the hole center along a virtual line extending in a predetermined direction from the hole center of the reference hole. Manufacturing method. The reference hole forming step includes
A gantry type drilling device equipped with a drill for drilling the first reference hole and the second reference hole is used,
The plunge processing step is
The manufacturing method of the square box pillar as described in any one of Claims 1-4 in which the said gantry type | mold drilling apparatus which replaced | exchanged the said drill drill of the said gantry type | mold drilling apparatus with the said plunge cutter is used.   The manufacturing method of the square box column of Claim 5 which further comprises the bead removal process which removes the bead after electroslag welding using the milling tool attached to the said gantry type | mold drilling apparatus.

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