JP7242957B1 - Processing method of H-shaped steel - Google Patents

Abstract

A method of working an H-section steel is provided that enables deep filling without reducing the web width of the H-section steel. A method for working an H-section steel according to the present invention is a method for working an H-section steel S having a pair of flanges F and a web W interconnecting the flanges F, wherein the pair of flanges F and the web W forming a long groove extending in the longitudinal direction of the H-shaped steel S by milling the connecting portion between the two from the outside of the flange F; fusing the web W with a fusing torch so as to connect the other longitudinal ends of the long grooves to each other; and fusing the pair of flanges F with the fusing torch so as to pass through the other ends of the long grooves. characterized by having [Selection drawing] Fig. 1A

Description

The present invention relates to a working method for H-section steel, and more particularly to a working method using milling for deep filling of a flange of H-section steel.

Conventionally, follow-up processing of flanges of H-section steel is performed with a rotary cutter type beveling machine described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2011-148050). However, in the case of deep fill-in processing with a large fill-in amount, the processing time by the fill-in cutter becomes long and the wear amount of the fill-in cutter increases. This has resulted in a significant decrease in work efficiency and a significant increase in processing costs.

On the other hand, there is also a method of manually performing deep drilling of the H-section steel flange using a gas cutting torch instead of using a rotary cutter beveling machine. However, manual work using a gas cutting torch is difficult to achieve high processing accuracy, and the finished product has large dimensional variations, resulting in poor work efficiency.

Patent Document 2 (Japanese Unexamined Patent Application Publication No. 2011-41952) proposes a method for deep machining of H-shaped steel in which the movement of a fusion torch such as a plasma torch or a laser torch is controlled. With this method, there is no problem of tool consumption and the machining time can be shortened.

However, it is difficult to melt the inner corner portion (the edge portion of the flange) where the web of the H-section steel intersects with the flange because the cutting torch interferes with the flange. For this reason, in order to avoid the interference, the cutting torch is moved in the driving direction from a position slightly moved inward in the width direction of the H-shaped steel in the deep driving of Patent Document 2 to cut the web (Patent See Fig. 1 of Document 2).

For this reason, as shown in FIG. 7, when the web W of the beam material of the H-section steel S and the tip portions W1 and F1 of the flange F are directly welded to the web W and the flange F of the column material of the counterpart H-section steel S , the web front end portion W1 becomes short, and welding cannot be performed using the entire width of the web, and the welding strength is impaired. Further, a gap W2 is formed between the web W of the column material and the flange F by the amount of movement of the fusion torch inward in the width direction of the H-section steel. The gap is too wide to be welded and the strength is compromised.

JP 2011-148050 A JP 2011-41952 A

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for working an H-section steel, which enables deep driving without reducing the web width of the H-section steel.

In order to solve the above-mentioned problems, a method for working an H-section steel according to the present invention is a method for working an H-section steel having a pair of flanges and a web interconnecting the flanges, wherein the pair of flanges and the web forming a long groove extending in the longitudinal direction of the H-shaped steel by milling the connecting portion from the outside of the flange, and cutting the pair of flanges so as to pass through one end of the long groove a step of fusing the web with a fusing torch so as to connect the other ends in the longitudinal direction of the long grooves to each other; and a step of fusing.

Further, a method for working an H-section steel according to the present invention is a method for working an H-section steel having a pair of flanges and a web connecting the flanges to each other, wherein the connecting portion between the pair of flanges and the web is a step of cutting from the outside of the flange by milling to form a long groove extending in the longitudinal direction of the H-section steel and opening at the longitudinal tip of the H-section steel; and fusing with a fusing torch so as to pass through one end on the side opposite to the opening side.

Further, a method for finishing a flange of an H-section steel according to the present invention is a method for finishing a flange of an H-section steel having a pair of flanges and a web interconnecting the flanges, wherein the pair of flanges and the web and forming a long groove extending in the longitudinal direction of the H-shaped steel by milling the outer side of the flange.

ADVANTAGE OF THE INVENTION According to this invention, a follow-up process can be performed, without reducing the web width of H-section steel.

It is a perspective view of H section steel explaining one embodiment of the present invention. 1B is a plan view and a side view of FIG. 1A; FIG. 1 is a perspective view of an H-section steel that has been deep driven by the method of the present invention; FIG. 1 is a plan view of a processing machine used in the method of the present invention; FIG. FIG. 2 is a plan view and a side view of an H-shaped steel that has been deep driven by the method of the present invention; It is the side view and sectional view of H section steel explaining milling processing. It is an enlarged sectional view of H section steel explaining milling processing. (a) is a plan view and a side view of an H-section steel for explaining a first modified example of the method of the present invention, and (b) is a perspective view of the H-section steel which has been deep driven. (a) is a plan view and a side view of an H-section steel for explaining a second modification of the method of the present invention, and (b) is a perspective view of the H-section steel subjected to deep drive processing. (a) is a perspective view of an H-section steel that has been deep-fed according to a third modification of the method of the present invention, and (b) and (c) are a plan view and a side view of the H-section steel for explaining the third modification. FIG. 2 is a perspective view showing an example of welding an H-section steel beam member that has been deep driven by the method of the present invention to an H-section steel column member. FIG. 3 is a perspective view showing an example of welding an H-section steel beam member that has been deep driven by the method of the present invention to an H-section steel beam member. It is a perspective view of H section steel explaining the 4th modification of the present invention. 9B is a plan view and a side view of FIG. 9A; FIG. FIG. 11 is a perspective view of an H-shaped steel subjected to deep drive processing in a fourth modified example;

(● one embodiment of the present invention)
FIG. 1A is a perspective view of an H-section steel S illustrating one embodiment of the present invention. FIG. 1B is a plan view and a side view of FIG. 1A.

The rectangular milling regions M0 of the left and right flanges F are hatched. This processing area M0 corresponds to the connecting portion between the web W of the H-section steel S and the flange F, and extends in the longitudinal direction of the H-section steel S. A long groove extending in the longitudinal direction of the H-section steel S is formed by milling the rectangular processing region M0.

By moving the milling tool M in FIG. 1A in the order of 1→2 and 5→6 indicated by circled numbers, the rectangular machining area M0 is machined into a long groove. Encircled numerals 1 and 5 are operations in which the milling tool M vertically cuts toward one end of the machining area M0. Details of the cutting depth at this time will be described later with reference to FIG. 3C. Encircled numerals 2 and 6 indicate the operation of moving the vertically cut milling tool M in the horizontal direction to the flange F surface to cut and widen the rectangular machining area M0. Details of the range to be cut and widened at this time will be described with reference to FIG. 3C.

After the rectangular processing area M0 is formed in the long groove, the fusing torch (not shown) is moved in the order of circled numbers 3→4→7→8→9→10→11. At 3⇒4, cut the front end of the right flange F in the vertical direction. At 7⇒8, the front end of the left flange F is cut longitudinally. The cutting lines of 3⇒4 and 7⇒8 pass through one end of the long groove of the left and right rectangular processing regions M0.

As the fusing torch, for example, a plasma torch for injecting plasma gas for fusing or a laser torch for fusing by irradiating a laser beam can be used. It is of course possible to use other types of fusing torches.

The direction of the arrow may be reversed for cutting 3⇒4 and 7⇒8. That is, cutting may be performed in the vertical direction starting from one end of the long groove of the left and right rectangular processing regions M0. Alternatively, the cutting of 3⇒4 and 7⇒8 may be cut upward or downward at once without changing the direction.

Next, the fusing torch is moved in the order of circled numbers 9->10->11 for edge trimming. Movement 9 cuts the front end of the web W in the width direction. Thus, the tip portion W1 can be formed to have a predetermined size.

9 moves along a straight line connecting the other ends of the long grooves of the left and right rectangular processing regions M0. At the beginning and end of the movement of 9, in order to avoid the fusing torch from interfering with the flange F, the hand side of the fusing torch should be appropriately inclined inward in the width direction of the web W (for example, about 45 degrees).

Movements 10 and 11 cut the tip of the flange F longitudinally. The movements of 10 and 11 are performed so as to pass through the other ends of the long grooves of the left and right rectangular processing regions M0 in the vertical direction. Movement of 10 and 11 is preferably from bottom to top. This is to avoid the cut offcuts (H-shaped offcuts S1) from coming into contact with the cutting torch.

By moving the cutting torch in the order of circled numbers 9→10→11, H-shaped offcuts S1 of H-shaped steel S are produced as shown in FIG. 1B. By moving the fusing torch in the order of 3, 4, 7, 8, 9, 10, 11, interference between the fusing torch and the scrap material S1 can be eliminated.

By the above-described milling and fusion cutting with a fusion cutting torch, it is possible to form the deep driven H-section steel S shown in FIG. 1C. As can be seen from FIGS. 1A-1C, the web width of the H-section steel S can be deep driven with little reduction.

Therefore, as shown in FIG. 7, when welding the web W of the beam material of the H-section steel S and the tip portions W1 and F1 of the flange F to the web W and the flange F of the column material of the H-section steel S on the other side, the web tip The entire width (maximum width) of the portion W1 can be welded to the web W of the column material of the counterpart H-section steel S without gaps. Therefore, the reduction in the web width does not impair the welding strength as shown in FIG. 1 of the patent document.

In addition, the beam material of the H-shaped steel S that has been deeply driven can be welded to the mating beam material with the web W oriented vertically as shown in FIG. 8 . 7 and 8, unless the leading ends W1 and F1 of the web W and the flange F are formed with accurate dimensional accuracy, welding cannot be performed to one of the leading ends W1 and F1. A gap of this size is generated, and reliable welding cannot be performed, and the welding strength is impaired. According to the method of the present invention, the web W and the front ends W1 and F1 of the flanges F can be formed with precise dimensional accuracy.

The deep drive machining of FIG. 1A can be performed by a machine 100 shown in FIG. This processing machine 100 is a combination of a milling processing machine and a plasma cutting machine, and has a milling processing area 110 and a plasma cutting area 120 adjacent to each other.

The H-section steel S, which is the material to be processed, is moved from the left side to the right side in FIG. During this movement, milling processes 1 ⇒ 2 and 5 ⇒ 6 shown in FIG. will be The H-shaped steel S for which the deep drive processing has been completed is carried out from the right side of the plasma cutting area 120 .

(Details of deep drive processing)
3A to 3C show details of the deep drive machining. The length L of the rectangular machining region M0 in FIG. 3B becomes the length L of deep drive machining in FIG. 3A.

Normally, the width W1 after processing of the web W inserted between the two flanges F is shortened from the inner side of each flange F by an amount D (FIG. 3A). This is so that even if there is a minus error in the inner dimensions of the two flanges of the counterpart to be welded as shown in FIGS. It is for The additional amount D can be arbitrarily set according to the error of the H-shaped steel S that is the material. As shown in FIG. 3C, the depth of cut of the milling tool M is the thickness of the flange F+the depth of cut D. As shown in FIG.

The inner corner portion where the flange F and the web W intersect is arcuately continuous. On this circular arc, the width BR is determined by the points A and B, which are the portions separated from the flange F by the drive-in amount D. As shown in FIG. Since the tip of the milling tool M is chamfered and there is an error in the arc shape of the inner corner where the flange F and the web W intersect, the actual milling width BR' is larger than the designed width BR. , the amount of chamfering at the tip of the milling tool M and the error in the arc shape of the inner corner portion of the flange F-web W can be set large.

(First Modification)
FIG. 4 shows the deep drive processing of the first modified example. In this first modified example, as shown in FIG. 4(a), the cutting torch is moved obliquely in circled numbers 3→4 and 7→8.

The oblique angle of inclination is, for example, 45 degrees. The H-section steel S having the shape shown in FIG. 4(b) can be formed by deep driving of the first modification.

(● 2nd modification)
FIG. 5 shows the deep drive processing of the second modification. In this second modification, the fusing torch is moved obliquely in circled numbers 3→4 and 7→8 as shown in FIG. 5(a).

The oblique angles of inclination are, for example, minus 45 degrees and plus 45 degrees. By the deep driving of this second modification, the H-section steel S having the shape shown in FIG. 5(b) can be formed.

The tips F1 of the left and right flanges F connect to the web W at right-angled corners. According to the first modified example and the second modified example, the joining form of the H-section steel S can be diversified without being limited to those shown in FIGS.

(● 3rd modification)
FIG. 6 shows the deep drive processing of the third modification. In this third modification, scallops Sc are additionally formed on both sides in the width direction of the web W of the H-section steel S of FIG. 1C by milling and fusing with a fusing torch. If it is attempted to form the scallop Sc only by fusing with a fusing torch, the fusing torch interferes with the flange F, so that the edge portion of the flange F of the H-section steel S, that is, the inner corner portions (M1, M2) where the web W and the flange F intersect. difficult to melt.

Therefore, in the third modification, the scallops Sc are formed by milling and fusing with a fusing torch. That is, after forming long holes in the milling regions M1 and M2 by milling, the fusing torch is moved in a semi-circular shape as indicated by P1 and P2 to cut the web W.

(● 4th modification)
FIGS. 9A to 9C show deep drive processing of the fourth modification. In this fourth modification, the rectangular milling regions M0 of the left and right flanges F extend to the ends of the H-section steel S. As shown in FIG. That is, the long groove formed by milling the rectangular processing region M0 extends in the longitudinal direction of the H-section steel S and opens at the tip of the H-section steel S in the longitudinal direction.

In FIGS. 1A to 1C, the tip portion of the H-section steel S (the tip portion W1 of the web W) was measured by plasma cutting indicated by circled numbers 9⇒10⇒11. However, if the dimensioning of the tip portion of the H-section steel S is completed in advance in the previous process, plasma cutting of the tip portion of the H-section steel S can be eliminated as shown in FIGS. 9A to 9C. The pre-process for sizing the tip portion of the H-section steel S can be performed by any method, for example, plasma cutting, band sawing, or the like. Further, the front end portion W1 of the web W may be formed by plasma cutting from the state of FIG. 9C.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications are possible. For example, in the above-described embodiment, the order is milling→fusing by the fusing torch, but it is also possible to reverse this and change the order to fusing by the fusing torch→milling. Further, the fusing with the fusing torch may be replaced with cutting/cutting with other tools. 1C and 9C, the front ends W1 and F1 of the web W and the flanges F may be beveled by milling or the like, if necessary.

100: Processing machine 110: Milling processing area 120: Plasma cutting area BR: Width of milling processing region M0 D: Addition amount F: H-shaped steel flange F1: Flange tip M: Milling tool
M0, M1, M2: Milling area S: H-section steel S1: End material Sc: Scallop W: H-section steel web W1: Web tip

Claims (8)

A method of processing an H-section steel having a pair of flanges and a web interconnecting the flanges, comprising:
forming a long groove extending in the longitudinal direction of the H-section steel by milling the connecting portion between the pair of flanges and the web from the outside of the flange;
fusing the pair of flanges with a fusing torch so as to pass through one end of the long groove;
a step of fusing the web with a fusing torch so as to connect the other ends of the long grooves in the longitudinal direction;
fusing the pair of flanges with a fusing torch so as to pass through the other end of the long groove;
A method for processing H-shaped steel, characterized by comprising: A method of processing an H-section steel having a pair of flanges and a web interconnecting the flanges, comprising:
A step of cutting the connection portion between the pair of flanges and the web from the outside of the flange by milling to form a long groove extending in the longitudinal direction of the H-section steel and opening at the longitudinal tip of the H-section steel. and,
fusing the pair of flanges with a fusing torch so as to pass through one end of the long groove opposite to the opening;
A method for processing an H-shaped steel, comprising: A method for finishing the flanges of H-section steel having a pair of flanges and a web interconnecting the flanges,
A processing method comprising a step of cutting a connecting portion between the pair of flanges and the web by milling from the outside of the flanges to form a long groove extending in the longitudinal direction of the H-section steel. 4. A processing method according to claim 3, further comprising the step of fusing said flange with a fusing torch. 5. A processing method according to claim 1, wherein said fusing torch is a plasma torch for fusing by injecting plasma gas. 5. The processing method according to claim 1, wherein a laser torch for cutting by irradiating a laser beam is used as said cutting torch. When forming scallops on the widthwise ends of the web, the edges of the flanges of the scallops are cut in the longitudinal direction of the H-shaped steel by milling, and the edges of the remaining portions of the scallops cut by the milling are cut. 5. The processing method according to claim 1, wherein the cutting is performed by a cutting torch. 5. A processing method according to any one of claims 1 to 4, wherein the axis of said milling is set perpendicular to said flange.

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