JP4454132B2 - Metal tube with flattened portion and manufacturing method thereof - Google Patents

Description

【０００１】
【発明の属する技術分野】
この発明は、建物の鉄骨架構に使用される鋼管等の偏平加工部付き金属管およびその製造方法に関する。
【０００２】
【従来の技術】
従来、建物の骨組みや機器のフレームを構成する鋼管において、他の部材との接合が行い易いように、管壁の一部を偏平化したものが使用されている。
このように偏平化する場合に、図１０に示すように、鋼管５１の偏平加工部５３の強化のために、偏平加工部５３となる部分に内径管５２を挿入して偏平加工することがある。
【０００３】
【発明が解決しようとする課題】
しかし、内径管５２を設けても、偏平加工部５３の圧縮耐力の強化は十分に得られず、偏平加工部５３の形成によって、鋼管５１の圧縮耐力が大幅に低下していた。また、内径管５２を挿入する過程に手間がかかり、コスト増となっていた。圧縮耐力を強化するには、鋼管５１に管壁の厚いものや外径の大きいものを使用する必要があり、さらにコスト増になる。
【０００４】
この発明の目的は、圧縮耐力等の耐力の向上と、コストの削減が図れる偏平加工部付き金属管およびその製造方法を提供することである。
【０００５】
【課題を解決するための手段】
この発明の偏平加工部付き金属管は、建物の鉄骨架構の軸材となる偏平加工部付き金属管であって、丸形の鋼管からなる金属管の端部に、管壁を塑性加工により増肉させた増肉加工部と、前記金属管の前記増肉加工部の一部を含む長さ範囲を塑性加工により偏平化させた偏平加工部とを有するものである。前記増肉加工部は、前記偏平加工部の基端部とこの偏平加工部に続く非偏平部分とに渡って設ける。前記偏平加工部の残り部分は、前記金属管の非増肉部分を偏平化した部分とする。増肉加工部の塑性加工は、例えば熱間で行う。偏平加工部の塑性加工も熱間で行う。
この構成によると、偏平加工部の基端部が増肉加工部で形成されるため、耐力、特に圧縮耐力が向上する。偏平加工部は、一般的には、非偏平部分との連続部付近の耐力が低下し易いが、この発明では、偏平加工部から非偏平部分にわたる部分が増肉加工部からなるため、優れた耐力が得られる。また増肉加工部は、素材となる鋼管である金属管の製造メーカ等において加工でき、増肉加工部付きの金属管として市場に供給できるため、従来のように内径管を挿入する場合に比べて偏平加工部付き金属管の製造コストが低減できる。また、耐力確保のために管径や管壁肉厚の大きい金属管を使用するものと比べると、同じ圧縮耐力を得るにつき、金属使用量が節減でき、コスト削減が図れる。また、偏平加工部の一般部は、非増肉部分を偏平化した部分としてあるが、偏平加工部を設けた場合、その基端部の周辺が耐力の低下し易い部分となるため、このように耐力の低下し易い部分だけを増肉加工部とすることにより、少ない鋼材使用量で効率的に耐力補強することができる。
【０００６】
この発明の偏平加工部付き金属管の製造方法は、この発明の偏平加工部付き金属管を製造する方法であって、素材となる金属管の長手方向の一部に、管壁を塑性加工により増肉させた増肉加工部を加工する増肉加工過程と、前記金属管の前記増肉加工部の一部を含む長さ範囲を塑性加工により偏平化させて偏平加工部とする過程とを含む方法である。前記偏平加工部の残り部分は、前記金属管の非増肉部分を偏平化した部分とする。
このように、先ず増肉加工部を設け、その後に偏平加工部を設けることにより、生産性良く、耐力に優れた偏平加工部付き金属管を製造することができる。
【０００７】
【発明の実施の形態】
この発明に対する参考提案例を図面と共に説明する。図１および図２に示すように、この偏平加工部付き金属管は、丸形の鋼管等からなる金属管１の端部に、管壁を熱間の塑性加工により増肉させた増肉加工部２と、この金属管１の増肉加工部２を塑性加工により偏平化させた偏平加工部３とを有するものである。偏平加工部３は、２重に重なる板状に偏平化した部分である。増肉加工部２は、偏平加工部３の全体とこの偏平加工部３に続く若干の長さ範囲の非偏平部分４とに渡って設けてある。
【０００８】
増肉加工部２の端部２ａは、次第に厚くなる断面形状としてある。増肉加工部２の非増肉部分に対する増肉倍率は、必要強度や使用形態等に応じて自由に設計される。増肉加工部２は、この参考提案例では、金属管１の内外両面に膨らませたものとしてあるが、図５，図６に示すように、金属管１の内径側のみに含ませたものであっても、これとは逆に金属板１の外径側のみに膨らませたものであっても良い。また、増肉加工部２および偏平加工部３を金属板１の端部に設ける場合に、これらを両端に設けても、一端のみに設けても良い。
【０００９】
この偏平加工部付き金属管の製造は、図３に示すように、まず素材となる金属管１（同図（Ａ））の長手方向の一部に、同図（Ｂ）のように、管壁を塑性加工により増肉させた増肉加工部２を形成する増肉加工過程の後、同図（Ｃ）のように金属板１の増肉加工部２を塑性加工により偏平化させて偏平加工部３とする。
なお、端部に偏平加工部３を有する偏平加工部付き金属管の場合、長手方向の中間に増肉加工部２を有する増肉加工管を製造した後、その増肉加工管を増肉加工部２の中間で切断し、その後に増肉加工部２に偏平加工部３を加工しても良い。また、中間に増肉加工部２および偏平加工部３まで加工した後に、その偏平加工部３の中間を切断しても良い。
【００１０】
増肉加工は、例えば図４に示すように行う。すなわち、金属管１に軸方向の圧縮力を加えながら、金属管１の長手方向の局部的な範囲を、外周から高周波加熱器５で加熱することにより増肉させ、その加熱増肉部２０を、冷却液ａの噴射により冷却して増肉加工部２の一部とする。このような加熱増肉部２０を金属管１の長手方向に連続的にずらせて形成することにより、所定長さの増肉加工部２を得る。
【００１１】
この構成の偏平加工部付き金属管によると、偏平加工部３が増肉加工部で形成されるため、耐力、特に圧縮耐力が向上する。偏平加工部３は、一般的には、非偏平部分４との連続部付近の耐力が低下し易いが、この参考提案例では、偏平加工部３から非偏平部分４にわたる部分が増肉加工部２からなるため、優れた耐力が得られる。また増肉加工部２は、素材となる鋼管等の金属管１の製造メーカ等において加工でき、増肉加工部付きの金属管として市場に供給できるため、従来のように内径管を挿入する場合に比べて偏平加工部付き金属管の製造コストが低減できる。また、耐力確保のために管径や管壁肉厚の大きい金属管を使用するものと比べると、同じ圧縮耐力が得るにつき、金属使用量が節減でき、コスト削減が図れる。
【００１２】
この偏平加工部付き金属管は、例えば建物の鉄骨架構の軸材や、機器のフレーム材として使用される。偏平加工部２は、他の部材に重ねてボルト等で接合する部位に用いられる。鉄骨架構に用いる場合、この偏平加工部付き金属管は、例えばラチス材やブレース等に用いられる。
【００１３】
図７，図８は、この発明の一実施形態を示す。この実施形態は、図１の参考提案例において、増肉加工部２を偏平加工部２の全体に設けた構成に代えて、増肉加工部２Ａを、偏平加工部３の基端部３ｂとこの偏平加工部３に続く非偏平部分４とに渡って設けたものである。偏平加工部３の一般部３ａは、非増肉部分を偏平化した部分としてある。
偏平加工部３を設けた場合、その基端部３ｂの周辺が耐力の低下し易い部分となるため、このように耐力の低下し易い部分だけを増肉加工部２Ａとすることにより、少ない鋼材使用量で効率的に耐力補強することができる。
【００１４】
図９は、さらに他の参考提案例を示す。同図に示すように、増肉加工部２を偏平加工部３とした増肉偏平加工部は、金属板１の長手方向の中間に設けても良く、また長手方向の複数箇所に設けても良い。
この構成の場合にも、偏平加工部３を増肉加工部２で形成することにより、低コストで耐力を向上させることができる。
【００１５】
【発明の効果】
この発明の偏平加工部付き金属管は、建物の鉄骨架構の軸材となる偏平加工部付き金属管であって、丸形の鋼管からなる金属管の端部に、管壁を塑性加工により増肉させた増肉加工部と、前記金属管の前記増肉加工部の一部を含む長さ範囲を塑性加工により偏平化させた偏平加工部とを有し、前記増肉加工部は、前記偏平加工部の基端部とこの偏平加工部に続く非偏平部分とに渡って設け、前記偏平加工部の残り部分は、前記金属管の非増肉部分を偏平化した部分であるため、圧縮耐力等の耐力の向上と、コストの削減を図ることができる。また、偏平加工部の一般部は、非増肉部分を偏平化した部分としてあるが、偏平加工部を設けた場合、その基端部の周辺が耐力の低下し易い部分となるため、このように耐力の低下し易い部分だけを増肉加工部とすることにより、少ない鋼材使用量で効率的に耐力補強することができる。
この発明の偏平加工部付き金属管の製造方法は、この発明の偏平加工部付き金属管を製造する方法であって、素材となる金属管の長手方向の一部に、管壁を塑性加工により増肉させた増肉加工部を形成する増肉加工過程と、前記金属管の前記増肉加工部の一部を含む長さ範囲、および前記増肉加工部よりも端側となる長さ範囲を塑性加工により偏平化させて偏平加工部とする過程とを含む方法であるため、生産性良く、圧縮耐力等の耐力に優れた偏平加工部付き金属管を製造することができる。
【図面の簡単な説明】
【図１】 （Ａ），（Ｂ）は、それぞれ参考提案例にかかる偏平加工部付き金属管の部分正面図および部分側面図である。
【図２】 同偏平加工部付き金属管の部分拡大斜視図である。
【図３】 同偏平加工部付き金属管の製造工程の説明図である。
【図４】 同偏平加工部付き金属管の増肉加工過程の説明図である。
【図５】 （Ａ），（Ｂ）は、それぞれ他の参考提案例にかかる偏平加工部付き金属管の部分正面図および部分側面図である。
【図６】 同偏平加工部付き金属管の部分拡大斜視図である。
【図７】 （Ａ），（Ｂ）は、それぞれこの発明の一実施形態にかかる偏平加工部付き金属管の部分正面図および部分側面図である。
【図８】 同偏平加工部付き金属管の部分拡大斜視図である。
【図９】 さらに他の参考提案例にかかる偏平加工部付き金属管の部分正面図である。
【図１０】 従来例の部分正面図である。
【符号の説明】
１…金属管
２…増肉加工部
３…偏平加工部
４…非偏平加工部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a metal pipe with a flattened portion such as a steel pipe used for a steel frame of a building and a method for manufacturing the same.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, steel pipes constituting building frames and equipment frames have been used in which a part of the pipe wall is flattened so that it can be easily joined to other members.
When flattening in this way, as shown in FIG. 10, in order to strengthen the flattened portion 53 of the steel pipe 51, the inner diameter tube 52 may be inserted into the flattened portion 53 and flattened. .
[0003]
[Problems to be solved by the invention]
However, even if the inner diameter pipe 52 is provided, the compression working strength of the flattened portion 53 cannot be sufficiently strengthened, and the formation of the flattened portion 53 significantly reduces the compressive strength of the steel pipe 51. Further, the process of inserting the inner diameter tube 52 takes time and increases the cost. In order to enhance the compression proof stress, it is necessary to use a steel pipe 51 having a thick pipe wall or a large outer diameter, which further increases the cost.
[0004]
An object of the present invention is to provide a metal tube with a flattened portion and a method for manufacturing the same, which can improve yield strength such as compression strength and reduce cost.
[0005]
[Means for Solving the Problems]
The metal tube with a flattened portion of the present invention is a metal tube with a flattened portion that serves as a shaft member of a steel frame of a building, and the pipe wall is increased by plastic working at the end of the metal tube made of a round steel pipe. a thickening processing unit that is meat, Ru der having a flat processing portion is flattened lengths range including a part of the thickening processing portion of the metal tube by plastic working. Before SL thickening processing unit, provided over a non-flat portion following the flat machining of the base end portion Toko of the flat processing unit. The remaining portion of the flattened portion is a flattened portion of the non-thickened portion of the metal tube. The plastic processing of the thickening portion is performed, for example, hot. The plastic working of the flat part is also performed hot.
According to this configuration, since the base end portion of the flattened portion is formed by the thickened portion, the yield strength, particularly the compression strength, is improved. In general, the flattened portion is likely to have a reduced yield strength in the vicinity of the continuous portion with the non-flat portion, but in the present invention, the portion extending from the flattened portion to the non-flat portion is composed of the thickened portion, which is excellent. Yield strength is obtained. In addition, the thickened part can be processed by a metal pipe manufacturer, which is a steel pipe used as a raw material, and can be supplied to the market as a metal pipe with a thickened part. Compared to the conventional case of inserting an inner diameter pipe, Thus, the manufacturing cost of the metal tube with a flattened portion can be reduced. Further, as compared with those using large metal pipe tube diameter and wall thickness for strength ensuring, per obtain the same compression strength, metal loading can be reduced, Ru Hakare cost savings. In addition, the general part of the flattened part is a part obtained by flattening the non-thickened part, but when the flattened part is provided, the periphery of the base end part becomes a part where the proof stress is likely to be reduced. In addition, by using only the portion where the proof stress is likely to decrease as the thickened portion, the reinforced strength can be efficiently reinforced with a small amount of steel material used.
[0006]
Manufacturing method of the flat processed part with a metal tube of this invention is a method of manufacturing a flat working portion with a metal tube of the present invention, a portion of the longitudinal direction of the metal tube to be a Material, plastic working the tube wall a thickening processing step of processing the thickening processing unit which is thickened by the steps of a flat machined portion by flattened by plastic working a length range that includes the part of the thickening processing portion of the metal tube Ru method der including. The remaining portion of the flattened portion is a flattened portion of the non-thickened portion of the metal tube.
As this, first provided thickening processing unit, and then used to provide a flat processing unit, with good productivity, it is possible to produce a flat processing unit with a metal tube having excellent strength.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
A reference proposal example for the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, this metal pipe with a flattened portion is a thickening process in which the pipe wall is thickened by hot plastic working at the end of a metal pipe 1 made of a round steel pipe or the like. And a flattened portion 3 obtained by flattening the thickened portion 2 of the metal tube 1 by plastic working. The flattened portion 3 is a flattened portion in a double overlapping plate shape. The thickening portion 2 is provided over the entire flat portion 3 and the non-flat portion 4 having a slight length range following the flat portion 3.
[0008]
The end 2a of the thickening portion 2 has a cross-sectional shape that gradually increases in thickness. The thickness increase ratio for the non-thickened portion of the thickened portion 2 is freely designed according to the required strength, usage pattern, and the like. In this reference proposal example , the thickening portion 2 is expanded on both the inner and outer surfaces of the metal tube 1, but is included only on the inner diameter side of the metal tube 1 as shown in FIGS. 5 and 6. Even if it exists, you may swell only to the outer-diameter side of the metal plate 1 contrary to this. Moreover, when providing the thickening process part 2 and the flat process part 3 in the edge part of the metal plate 1, these may be provided in both ends, and may be provided only in one end.
[0009]
As shown in FIG. 3, the production of the metal tube with the flattened portion is first performed on a part of the longitudinal direction of the metal tube 1 (FIG. (A)) as a material, as shown in FIG. After the thickening process of forming the thickened part 2 with the wall thickened by plastic working, the thickened part 2 of the metal plate 1 is flattened by plastic working as shown in FIG. Let it be a processing section 3.
In addition, in the case of a metal tube with a flattened portion having a flattened portion 3 at the end, after manufacturing a thickened tube having a thickened portion 2 in the middle in the longitudinal direction, the thickened tube is thickened. It may cut | disconnect in the middle of the part 2, and may process the flat process part 3 in the thickening process part 2 after that. Moreover, after processing to the thickening part 2 and the flat part 3 in the middle, you may cut | disconnect the intermediate part of the flat part 3.
[0010]
The thickening process is performed, for example, as shown in FIG. That is, while applying a compressive force in the axial direction to the metal tube 1, the local range in the longitudinal direction of the metal tube 1 is increased by heating from the outer periphery with the high-frequency heater 5, Then, it is cooled by jetting the cooling liquid a to be a part of the thickening portion 2. By forming such a heat-increased portion 20 continuously shifted in the longitudinal direction of the metal tube 1, a thickened portion 2 having a predetermined length is obtained.
[0011]
According to the metal tube with a flattened portion having this configuration, the flattened portion 3 is formed of the thickened portion, and therefore, the proof stress, particularly the compression proof strength is improved. In general, the flattened portion 3 tends to have a reduced proof stress in the vicinity of the continuous portion with the non-flat portion 4, but in this reference proposal example , the portion extending from the flattened portion 3 to the non-flat portion 4 is the thickened portion. Since it consists of 2, the outstanding proof stress is acquired. Moreover, the thickening part 2 can be processed by the manufacturer of the metal pipe 1 such as a steel pipe as a raw material and can be supplied to the market as a metal pipe with a thickening part. Compared with, the manufacturing cost of the metal tube with a flattened portion can be reduced. In addition, compared with the case of using a metal pipe having a large pipe diameter and wall thickness for securing the proof stress, the amount of metal used can be reduced and the cost can be reduced as the same compressive proof stress is obtained.
[0012]
This metal tube with a flattened portion is used as, for example, a shaft member of a steel frame of a building or a frame member of a device. The flattened portion 2 is used for a portion that is overlapped with another member and joined with a bolt or the like. When used in a steel frame, this metal tube with a flattened portion is used for, for example, a lattice material or a brace.
[0013]
7 and 8 show an embodiment of the present invention. In this embodiment, in the reference proposal example of FIG. 1, instead of the configuration in which the thickening portion 2 is provided in the entire flattening portion 2, the thickening portion 2A is replaced with the base end portion 3 b of the flattening portion 3. This is provided over the flat portion 4 following the flat portion 3. The general portion 3a of the flattened portion 3 is a portion obtained by flattening the non-thickened portion.
When the flattened portion 3 is provided, the periphery of the base end portion 3b becomes a portion where the proof stress is likely to decrease. Therefore, only the portion where the proof strength is likely to decrease is used as the thickened portion 2A, thereby reducing the number of steel materials. The yield strength can be efficiently reinforced by the amount used.
[0014]
FIG. 9 shows still another reference proposal example . As shown in the figure, the thickening flattened portion in which the thickening processed portion 2 is the flattened processing portion 3 may be provided in the middle of the longitudinal direction of the metal plate 1 or may be provided at a plurality of locations in the longitudinal direction. good.
Even in this configuration, by forming the flattened portion 3 with the thickened portion 2, it is possible to improve the yield strength at a low cost.
[0015]
【The invention's effect】
Flat machining unit with a metal tube of this invention is a flat machined portion with the metal tube to be a shaft member of the building steel frames, the ends of the metallic pipe made of steel pipe of a round, the plastic working the tube wall a thickening processing unit which is thickening, a length range that includes the part of the thickening processing portion of the metal tube is perforated and flat processing portion is flattened by plastic working, the thickening processing unit, Since it is provided over the base end portion of the flattened portion and the non-flattened portion following the flattened portion, the remaining portion of the flattened portion is a portion obtained by flattening the non-thickened portion of the metal tube . and improvement of the strength of such compressive yield strength, Ru can be reduced in cost. In addition, the general part of the flattened part is a part obtained by flattening the non-thickened part, but when the flattened part is provided, the periphery of the base end part becomes a part where the proof stress is likely to be reduced. In addition, by using only the portion where the proof stress is likely to decrease as the thickened portion, the reinforced strength can be efficiently reinforced with a small amount of steel material used.
The method for producing a metal tube with a flattened portion according to the present invention is a method for producing a metal tube with a flattened portion according to the present invention. a thickening processing step of forming a thickening processing unit which is thickened, the increase in length range including part of a meat portion, and the length of the end side of the thickening processing portion of the metal tube Since the method includes the process of flattening the range by plastic working to form a flattened portion, a metal tube with a flattened portion excellent in yield strength such as compressive strength can be manufactured with high productivity.
[Brief description of the drawings]
FIGS. 1A and 1B are a partial front view and a partial side view of a metal tube with a flattened portion according to a reference proposal example , respectively.
FIG. 2 is a partially enlarged perspective view of the metal tube with the flattened portion.
FIG. 3 is an explanatory diagram of a manufacturing process of the metal tube with the flattened portion.
FIG. 4 is an explanatory view of a process of increasing the thickness of the metal tube with the flattened portion.
FIGS. 5A and 5B are a partial front view and a partial side view of a metal tube with a flattened portion according to another reference proposal example , respectively.
FIG. 6 is a partially enlarged perspective view of the metal tube with the flattened portion.
FIGS. 7A and 7B are a partial front view and a partial side view of a metal tube with a flattened portion according to an embodiment of the present invention, respectively.
FIG. 8 is a partially enlarged perspective view of the metal tube with the flattened portion.
It is a partial front view of the flat processed part with a metal tube according to other references proposed example in Figure 9 is found.
FIG. 10 is a partial front view of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Metal pipe 2 ... Thickening processing part 3 ... Flat processing part 4 ... Non-flat processing part

Claims (2)

建物の鉄骨架構の軸材となる偏平加工部付き金属管であって、丸形の鋼管からなる金属管の端部に、管壁を塑性加工により増肉させた増肉加工部と、前記金属管の前記増肉加工部の一部を含む長さ範囲を塑性加工により偏平化させた偏平加工部とを有し、前記増肉加工部は、前記偏平加工部の基端部とこの偏平加工部に続く非偏平部分とに渡って設け、前記偏平加工部の残り部分は、前記金属管の非増肉部分を偏平化した部分である偏平加工部付き金属管。 A flat processing unit with the metal tube to be a shaft member of the building steel frames, the ends of the metallic pipe made of steel pipe round, and increased meat portion was thickened tube wall by plastic working, wherein length range including a part of the thickening processing of the metal tube was closed and a flat processing portion is flattened by plastic working, the thickening processing unit, the flat proximal end portion of the flat processing unit A metal tube with a flattened portion which is provided over a non-flattened portion following the processed portion, and the remaining portion of the flattened portion is a flattened portion of the non-thickened portion of the metal tube. 請求項１記載の偏平加工部付き金属管を製造する方法であって、素材となる金属管の長手方向の一部に、管壁を塑性加工により増肉させた増肉加工部を形成する増肉加工過程と、前記金属管の前記増肉加工部の一部を含む長さ範囲、および前記増肉加工部よりも端側となる長さ範囲を塑性加工により偏平化させて偏平加工部とする過程とを含む偏平加工部付き金属管の製造方法。 A method of manufacturing a flat working portion with a metal tube according to claim 1, wherein, in a portion of the longitudinal direction of the metal tube to be a Material to form the thickening processing unit obtained by thickening the plastic working the tube wall a thickening processing step, the length range including part of the thickening processing portion of the metal pipe, and flat length range of the end side of the thickening processing unit by flattened by plastic working process The manufacturing method of the metal pipe with a flat processed part including the process made into a part.

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