JP7112733B2 - zygote - Google Patents

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JP7112733B2
JP7112733B2 JP2018199513A JP2018199513A JP7112733B2 JP 7112733 B2 JP7112733 B2 JP 7112733B2 JP 2018199513 A JP2018199513 A JP 2018199513A JP 2018199513 A JP2018199513 A JP 2018199513A JP 7112733 B2 JP7112733 B2 JP 7112733B2
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steel
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tubular portion
facing portion
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JP2020066021A (en
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拓郎 梅谷
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Hinode Ltd
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Description

本発明は、鋳鉄製部材と鋼製部材とを摩擦圧接により接合した接合体に関する。 TECHNICAL FIELD The present invention relates to a joined body in which a cast iron member and a steel member are joined by friction welding.

特許文献１には、球状黒鉛変形層の形成を防止若しくは抑制して高い接合強度を得ることが記載されている。そのため、特許文献１には、球状黒鉛鋳鉄と鉄鋼材料の摩擦圧接において球状黒鉛鋳鉄の圧接面に鉄基金属材、あるいはニッケル基金属材をインサートしたこと、球状黒鉛鋳鉄と鉄鋼材料の摩擦圧接において球状黒鉛鋳鉄の圧接面を凹形状としたこと、球状黒鉛鋳鉄と鉄鋼材料の摩擦圧接において球状黒鉛鋳鉄の圧接面に鉄基金属材、あるいはニッケル基金属材をインサートすると共に球状黒鉛鋳鉄の圧接面を凹形状としたことが記載されている。 Patent Literature 1 describes that high bonding strength is obtained by preventing or suppressing the formation of a spherical graphite deformed layer. Therefore, in Patent Document 1, in the friction welding of spheroidal graphite cast iron and steel materials, an iron-based metal material or nickel-based metal material is inserted into the pressure welding surface of spheroidal graphite cast iron, and in the friction welding of spheroidal graphite cast iron and steel materials The pressure contact surface of the spheroidal graphite cast iron is made concave, and in the friction welding of the spheroidal graphite cast iron and the steel material, an iron-based metal material or nickel-based metal material is inserted into the pressure contact surface of the spheroidal graphite cast iron, and the pressure contact surface of the spheroidal graphite cast iron. is described as having a concave shape.

特開２００２－１１３５８３号公報（要約）Japanese Unexamined Patent Application Publication No. 2002-113583 (summary)

鋳鉄製の円管状部と鋼製の円管状部とを摩擦圧接により接合した、接合強度の高い接合体が求められている。 There is a demand for a joined body having a high joining strength in which a cast-iron tubular portion and a steel tubular portion are joined by friction welding.

本発明の一態様は、摩擦圧接により互いの軸方向に沿う第１の方向に接合される鋳鉄製の円管状部と鋼製の円管状部とを備える接合体である。鋳鉄製の円管状部は、鋼製の円管状部に対して第１の方向に対向する第１の対向部と、第１の対向部に連なるとともに鋼製の円管状部に対して内周側から隙間を隔てて対向する第２の対向部とを含む。鋼製の円管状部は、摩擦圧接の際に塑性流動化した部分が第１の対向部に向けて前記隙間を狭めるように管厚を拡大させる管厚拡大部を含む。管厚拡大部は、第１の対向部に接合される第１の接合部と、第１の接合部に連なるとともに第２の対向部に接合される第２の接合部とを含む。 One aspect of the present invention is a joined body that includes a cast iron tubular portion and a steel tubular portion that are joined together in a first axial direction by friction welding. The cast-iron tubular portion has a first facing portion that faces the steel tubular portion in the first direction, and a first facing portion that is continuous with the first facing portion and extends on the inner periphery of the steel tubular portion. and a second facing portion that faces from the side with a gap therebetween. The circular tubular portion made of steel includes an enlarged pipe thickness portion in which the portion plastically fluidized during friction welding increases the pipe thickness toward the first opposing portion so as to narrow the gap. The thickened pipe portion includes a first joint portion joined to the first facing portion, and a second joint portion connected to the first joint portion and joined to the second facing portion.

本発明の一態様において、鋳鉄製の円管状部は、鋼製の円管状部に対して第１の方向に対向する第１の対向部と、第１の対向部に連なるとともに鋼製の円管状部に対して内周側から隙間を隔てて対向する第２の対向部とを含む。摩擦圧接の際、鋼製の円管状部の塑性流動化した部分は、鋳鉄製の円管状部の第１の対向部に向けて、第２の対向部との隙間を狭めるように管厚を拡大させながら、第２の対向部に近付く。このため、鋼製の円管状部の管厚拡大部を、鋳鉄製の円管状部の第１の対向部だけでなく、第１の対向部に連なる第２の対向部にも接合させることができる。したがって、鋳鉄製の円管状部と鋼製の円管状部との接合強度を向上させることができる。 In one aspect of the present invention, the cast-iron circular tubular portion includes a first opposing portion that faces the steel circular tubular portion in a first direction, and a steel circular tubular portion that is continuous with the first opposing portion. and a second facing portion that faces the tubular portion from the inner peripheral side with a gap therebetween. During friction welding, the plastically fluidized portion of the steel circular tubular portion is directed to the first opposing portion of the cast iron circular tubular portion, and the pipe thickness is reduced so as to narrow the gap with the second opposing portion. The second opposing portion is approached while being enlarged. For this reason, it is possible to join the increased pipe thickness portion of the steel circular tubular portion not only to the first facing portion of the cast iron circular tubular portion, but also to the second facing portion connected to the first facing portion. can. Therefore, the joint strength between the cast-iron cylindrical portion and the steel cylindrical portion can be improved.

鋳鉄製の円管状部は、第１の対向部と第２の対向部とを繋ぐ湾曲部を含むことが好ましい。第１の対向部と第２の対向部とが湾曲部を介して繋がれているため、塑性流動化した部分を第１の対向部から第２の対向部に向けてスムーズに誘導することができる。したがって、第２の接合部の接合領域を拡大させやすい。さらに、第１の接合部と第２の接合部とを湾曲部に沿って繋ぐことができるため、第１の接合部と第２の接合部との繋ぎ目における接合不良を抑制しやすい。 It is preferable that the cast iron tubular portion includes a curved portion that connects the first facing portion and the second facing portion. Since the first facing portion and the second facing portion are connected via the curved portion, the plastically fluidized portion can be smoothly guided from the first facing portion toward the second facing portion. can. Therefore, it is easy to expand the bonding area of the second bonding portion. Furthermore, since the first joint portion and the second joint portion can be connected along the curved portion, it is easy to suppress joint failure at the joint between the first joint portion and the second joint portion.

第２の対向部は、第１の対向部から遠ざかるにつれて前記隙間を広げるように第１の方向に対して傾斜した傾斜部を含むことが好ましい。第２の対向部が、第１の対向部から遠ざかるにつれて、鋼製の円管状部との隙間を広げるように傾斜した傾斜部を含むため、塑性流動化した部分を傾斜部に沿って這わせやすい。したがって、第２の接合部の接合領域を一層拡大させやすい。さらに、管厚拡大部を傾斜部に沿って接合させることで、第１の方向に対する第２の接合部の傾斜を緩勾配化することができる。このため、第２の接合部が第２の対向部から過剰な反力を受けることを抑制しやすい。したがって、第１の対向部に対して第１の接合部の接合位置がずれたり接合が剥がれたりする事態を抑制しやすい。 It is preferable that the second facing portion includes an inclined portion that is inclined with respect to the first direction so that the gap widens as the distance from the first facing portion increases. Since the second opposing portion includes an inclined portion that is inclined so as to widen the gap with the steel cylindrical portion as it moves away from the first opposing portion, the plastically fluidized portion is made to crawl along the inclined portion. Cheap. Therefore, it is easier to further expand the joint area of the second joint. Furthermore, by joining the thickened pipe portion along the inclined portion, the inclination of the second joint portion with respect to the first direction can be made gentler. Therefore, it is easy to prevent the second joint from receiving an excessive reaction force from the second opposing portion. Therefore, it is easy to suppress a situation in which the bonding position of the first bonding portion is displaced from the first opposing portion or the bonding is peeled off.

第２の対向部は、周方向に断続的に形成されていてもよいが、周方向に連続的に形成されていることが好ましい。第２の対向部が周方向に連続的に形成されているため、第２の接合部の接合領域を一層拡大させることができる。したがって、鋳鉄製の円管状部と鋼製の円管状部との接合強度を一層向上させることができる。 Although the second facing portion may be intermittently formed in the circumferential direction, it is preferably formed continuously in the circumferential direction. Since the second facing portion is formed continuously in the circumferential direction, the joint area of the second joint portion can be further expanded. Therefore, the joint strength between the cast-iron tubular portion and the steel tubular portion can be further improved.

鋳鉄製の円管状部と鋼製の円管状部とを摩擦圧接により接合した、接合強度の高い接合体を提供することができる。 It is possible to provide a joined body having a high joining strength, in which a cast-iron tubular portion and a steel tubular portion are joined by friction welding.

図１は、接合体を含む構造物の例を示す模式図である。FIG. 1 is a schematic diagram showing an example of a structure including a bonded body. 図２は、接合体の断面図である。FIG. 2 is a cross-sectional view of the joined body. 図３は、接合手順その１を示す模式図である。FIG. 3 is a schematic diagram showing the first joining procedure. 図４は、接合手順その２を示す模式図である。FIG. 4 is a schematic diagram showing the second joining procedure. 図５は、変形例に係る接合体の断面図である。FIG. 5 is a cross-sectional view of a joined body according to a modification. 図６は、摩擦圧接前の鋳鉄製の円管状部の正面図である。FIG. 6 is a front view of a cylindrical portion made of cast iron before friction welding. 図７は、摩擦圧接前の鋳鉄製の円管状部の変形例を示す正面図である。FIG. 7 is a front view showing a modification of the cylindrical portion made of cast iron before friction welding.

以下、添付図面を参照して、本願の開示する接合体の実施形態を詳細に説明する。なお、以下に示す実施形態によりこの発明が限定されるものではない。 Hereinafter, embodiments of the joined body disclosed in the present application will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

また、以下に示す実施形態では、「円」あるいは「平行」といった表現を用いるが、厳密に「円」であったり、「平行」であったりすることを要しない。すなわち、上記した各表現は、製造精度、設置精度などのずれを許容するものとする。 Also, in the embodiments described below, expressions such as "circle" and "parallel" are used, but strictly "circle" and "parallel" are not required. That is, each of the expressions described above allows deviations in manufacturing accuracy, installation accuracy, and the like.

まず、実施形態に係る接合体１０を含む構造物の例について図１を用いて説明する。図１は、接合体１０を含む構造物１の例を示す模式図である。なお、図１では、構造物１の一例として道路などに設置される標識を示しているが、これに限らず、接合体１０は街灯やポール、フェンスなどにも広く用いることができる。また、接合体１０は、建造物の柱や梁などにも広く用いることができる。 First, an example of a structure including the joined body 10 according to the embodiment will be described with reference to FIG. FIG. 1 is a schematic diagram showing an example of a structure 1 including a joined body 10. FIG. Note that FIG. 1 shows a sign installed on a road or the like as an example of the structure 1, but the joint 10 is not limited to this, and can be widely used for street lamps, poles, fences, and the like. Also, the joint 10 can be widely used for pillars and beams of buildings.

図１に示すように、構造物１は、接合体１０と、接合体１０の一端側に固定された指示板３００とを備える。指示板３００の一例は、交通標識を図案化した表示板である。接合体１０は、鋳鉄製部材２００と、鋳鉄製部材２００に摩擦圧接により接合された鋼製部材１００とを含む。鋳鉄製部材２００は、鋳鉄製の円管状部（鋳鉄製円管状部）２１０と、鋳鉄製円管状部２１０に連続するように一体的に形成された鋳鉄製の基部２５０とを含む。基部２５０は、構造物１を地面上や地面中に固定するために用いられる。鋳鉄製部材２００は、ダクタイル鋳鉄製であり、形状自由度が高く、鋳造による一体成形が可能である。したがって、様々な形状の構造物１にも幅広く対応することができる。鋼製部材１００は、鋳鉄製円管状部２１０に摩擦圧接により接合された鋼製の円管状部（鋼製円管状部）１１０を含む。指示板３００は、鋼製円管状部１１０の一端側（鋳鉄製円管状部２１０とは反対側）に固定されている。なお、図１では、鋼製部材１００が鋼製円管状部１１０のみを含む場合を示しているが、鋼製部材１００が、たとえば、鋼製円管状部１１０と、鋼製円管状部１１０に連続する円柱状部等とを含むこととしてもよい。 As shown in FIG. 1 , the structure 1 includes a joined body 10 and an indicator plate 300 fixed to one end side of the joined body 10 . An example of the indication board 300 is a display board with a design of a traffic sign. The joined body 10 includes a cast iron member 200 and a steel member 100 joined to the cast iron member 200 by friction welding. The cast-iron member 200 includes a cast-iron tubular portion (cast-iron tubular portion) 210 and a cast-iron base portion 250 integrally formed so as to be continuous with the cast-iron tubular portion 210 . The base 250 is used to fix the structure 1 on or in the ground. The cast iron member 200 is made of ductile cast iron, has a high degree of freedom in shape, and can be integrally formed by casting. Therefore, it is possible to widely deal with structures 1 having various shapes. The steel member 100 includes a steel tubular portion (steel tubular portion) 110 joined to a cast iron tubular portion 210 by friction welding. The indicator plate 300 is fixed to one end side of the steel circular tubular portion 110 (the side opposite to the cast iron circular tubular portion 210). Although FIG. 1 shows the case where the steel member 100 includes only the steel tubular portion 110, the steel member 100 includes, for example, the steel tubular portion 110 and the steel tubular portion 110. It may also include a continuous columnar portion or the like.

図２は、接合体１０の断面図である。なお、図２は、接合体１０の中心線Ｌ１を含む平面で接合体１０を切断した断面図に相当する。図２には、鋼製円管状部１１０および鋳鉄製円管状部２１０の互いの軸方向に沿う第１の方向Ｄ１を示している。図２に示すように、接合体１０は、摩擦圧接により第１の方向Ｄ１に接合された鋳鉄製円管状部２１０および鋼製円管状部１１０を備える。鋳鉄製円管状部２１０は、鋼製円管状部１１０に対して第１の方向Ｄ１に対向する第１の対向部２２１と、第１の対向部２２１に連なるとともに鋼製円管状部１１０に対して内周側から隙間Ｇを隔てて対向する第２の対向部２２２とを含む。第２の対向部２２２は、鋼製円管状部１１０の内周面１１５に対して隙間Ｇを隔てて平行に対向するように、第１の対向部２２１から第１の方向Ｄ１にストレートに突出している。鋼製円管状部１１０は、摩擦圧接の際に塑性流動化した部分が、第１の対向部２２１に近付くにつれて隙間Ｇを狭めるように管厚を拡大させた管厚拡大部１２０を含む。摩擦圧接の際、鋼製円管状部１１０の塑性流動化した部分は、鋳鉄製円管状部２１０の第１の対向部２２１に近付くにつれて、第２の対向部２２２との隙間Ｇを狭めるように管厚を拡大させながら、第２の対向部２２２に近付く。このため、鋼製円管状部１１０の管厚拡大部１２０を、鋳鉄製円管状部２１０の第１の対向部２２１だけでなく、第１の対向部２２１に連なる第２の対向部２２２にも接合させることができる。したがって、鋳鉄製円管状部２１０と鋼製円管状部１１０との接合強度（引張強度）を向上させることができる。このように、本実施形態においては、管厚拡大部１２０が、第１の対向部２２１に接合された第１の接合部１２１と、第１の接合部１２１に連なるとともに第２の対向部２２２に接合された第２の接合部１２２とを含む、接合強度の高い接合体１０を提供することができる。 FIG. 2 is a cross-sectional view of the joined body 10. As shown in FIG. 2 corresponds to a cross-sectional view of the joined body 10 cut along a plane including the center line L1 of the joined body 10. FIG. FIG. 2 shows the first direction D1 along the axial directions of the steel tubular portion 110 and the cast iron tubular portion 210 . As shown in FIG. 2, the joined body 10 includes a cast iron tubular portion 210 and a steel tubular portion 110 joined in the first direction D1 by friction welding. The cast iron tubular portion 210 has a first facing portion 221 that faces the steel tubular portion 110 in the first direction D1, and a first facing portion 221 that is continuous with the steel tubular portion 110. and a second facing portion 222 facing from the inner peripheral side with a gap G therebetween. The second facing portion 222 projects straight from the first facing portion 221 in the first direction D1 so as to face the inner peripheral surface 115 of the tubular steel portion 110 in parallel with a gap G therebetween. ing. The steel circular tubular portion 110 includes an increased thickness portion 120 in which the portion plastically fluidized during friction welding is increased in thickness so as to narrow the gap G as it approaches the first facing portion 221 . During friction welding, the plastically fluidized portion of the steel tubular portion 110 narrows the gap G between the second opposing portion 222 and the first opposing portion 221 of the cast iron tubular portion 210 as it approaches the first opposing portion 221. The second opposing portion 222 is approached while increasing the pipe thickness. Therefore, the increased thickness portion 120 of the steel circular tubular portion 110 is provided not only in the first facing portion 221 of the cast iron circular tubular portion 210 but also in the second facing portion 222 connected to the first facing portion 221. can be joined. Therefore, the joint strength (tensile strength) between the cast iron tubular portion 210 and the steel tubular portion 110 can be improved. As described above, in the present embodiment, the pipe thickened portion 120 is connected to the first joint portion 121 joined to the first facing portion 221, and connected to the first joint portion 121 and connected to the second facing portion 222. It is possible to provide a bonded body 10 having high bonding strength, including the second bonding portion 122 bonded to the second bonding portion 122 .

また、図２に示したように、鋳鉄製円管状部２１０は、第１の対向部２２１と第２の対向部２２２とを繋ぐ湾曲部２２３を含む。湾曲部２２３は、第１の対向部２２１と第２の対向部２２２とを段差なく滑らかに繋ぐＲ形状の部分である。このように、第１の対向部２２１と第２の対向部２２２とが湾曲部２２３を介して繋がれているため、鋼製円管状部１１０の塑性流動化した部分を第１の対向部２２１から第２の対向部２２２に向けてスムーズに誘導することができる。したがって、第２の接合部１２２の接合領域を拡大させやすい。さらに、第１の接合部１２１と第２の接合部１２２とを湾曲部２２３に沿って繋ぐことができるため、第１の接合部１２１と第２の接合部１２２との繋ぎ目における接合不良を抑制しやすい。 Further, as shown in FIG. 2 , the cast-iron tubular portion 210 includes a curved portion 223 that connects the first facing portion 221 and the second facing portion 222 . The curved portion 223 is an R-shaped portion that smoothly connects the first facing portion 221 and the second facing portion 222 without a step. In this way, since the first facing portion 221 and the second facing portion 222 are connected via the curved portion 223, the plastically fluidized portion of the tubular steel portion 110 is connected to the first facing portion 221. can be smoothly guided toward the second facing portion 222 from the second facing portion 222 . Therefore, it is easy to expand the bonding area of the second bonding portion 122 . Furthermore, since the first joint portion 121 and the second joint portion 122 can be connected along the curved portion 223, joint failure at the joint between the first joint portion 121 and the second joint portion 122 can be prevented. easy to suppress.

また、図２に示したように、鋼製円管状部１１０の第２の接合部１２２は、鋳鉄製円管状部２１０の第２の対向部２２２に対して、第２の対向部２２２に対向する方向から接合されている。すなわち、鋼製円管状部１１０は、鋳鉄製円管状部２１０に対して、第１の方向Ｄ１からだけでなく、第１の方向Ｄ１に交差する方向（第２の対向部２２２に対向する方向）からも接合される。このため、鋳鉄製円管状部２１０と鋼製円管状部１１０との接合方向を増やすことができる。したがって、引張強度だけでなく、せん断強度や曲げ強度も向上させた接合体１０を提供することができる。 Also, as shown in FIG. 2 , the second joint portion 122 of the steel tubular portion 110 faces the second opposing portion 222 of the cast iron tubular portion 210 . It is joined from the direction of That is, the steel circular tubular portion 110 is positioned not only in the first direction D1 but also in the direction intersecting the first direction D1 (the direction facing the second facing portion 222) with respect to the cast iron circular tubular portion 210. ) are also joined. Therefore, the joining directions of the cast iron tubular portion 210 and the steel tubular portion 110 can be increased. Therefore, it is possible to provide the joined body 10 with improved not only tensile strength but also shear strength and bending strength.

次に、接合体１０の接合手順について図３および図４を用いて説明する。図３および図４は、接合手順その１およびその２を示す模式図である。なお、図３および図４は、図２と同様に接合体１０の中心線Ｌ１を含む平面で切断した断面図である。また、図３に示した手順、図４に示した手順を経て図２に示した接合体１０が得られる。 Next, a procedure for joining the joined body 10 will be described with reference to FIGS. 3 and 4. FIG. 3 and 4 are schematic diagrams showing the first and second joining procedures. 3 and 4 are cross-sectional views cut along a plane including the center line L1 of the joined body 10, as in FIG. 2 is obtained through the procedure shown in FIG. 3 and the procedure shown in FIG.

図３に示すように、鋳鉄製円管状部２１０を中心線Ｌ１まわりに回転向きＲＤで回転させるとともに、鋼製円管状部１１０を移動向きＬＤ（鋳鉄製円管状部２１０に近付く向き）に移動させる。これにより、鋼製円管状部１１０は、鋳鉄製円管状部２１０の第１の対向部２２１に接し、摩擦圧接が開始される。なお、この段階では、鋼製円管状部１１０の内周面１１５は、第２の対向部２２２に接していない。つまり、第２の対向部２２２は、鋼製円管状部１１０に対して内周面１１５から隙間Ｇを隔てて平行に対向している。なお、図３に示した回転向きＲＤは逆向きとしてもよい。 As shown in FIG. 3, the cast iron circular tubular portion 210 is rotated around the center line L1 in the rotation direction RD, and the steel circular tubular portion 110 is moved in the movement direction LD (the direction toward the cast iron tubular portion 210). Let As a result, the steel tubular portion 110 comes into contact with the first opposing portion 221 of the cast iron tubular portion 210, and friction welding is started. At this stage, the inner peripheral surface 115 of the tubular steel portion 110 is not in contact with the second facing portion 222 . That is, the second facing portion 222 faces the steel circular tubular portion 110 in parallel with the inner peripheral surface 115 with a gap G therebetween. Note that the direction of rotation RD shown in FIG. 3 may be reversed.

図４に示すように、鋳鉄製円管状部２１０へ押し付けられる鋼製円管状部１１０と、回転する鋳鉄製円管状部２１０との摩擦によって接触部分の温度が上昇する。そして、接触部分の温度は、鋳鉄製円管状部２１０の融点を超え、鋳鉄製円管状部２１０の融点を超えた部分は遠心力によって飛散する。 As shown in FIG. 4, the friction between the steel tubular portion 110 pressed against the cast iron tubular portion 210 and the rotating cast iron tubular portion 210 raises the temperature of the contact portion. The temperature of the contact portion exceeds the melting point of the cast-iron tubular portion 210, and the portion exceeding the melting point of the cast-iron tubular portion 210 scatters due to centrifugal force.

一方、鋼製円管状部１１０の塑性流動化した部分は、鋳鉄製円管状部２１０の第１の対向部２２１に向けて第２の対向部２２２との隙間Ｇを狭めるように管厚を拡大させながら第２の対向部２２２に近付いていく。そして、鋼製円管状部１１０の塑性流動化した部分は、第１の対向部２２１から湾曲部２２３を経由して第２の対向部２２２を這うように変形していき、摩擦圧接完了時には、図２に示したように、塑性流動化した部分により形成された管厚拡大部１２０が、第１の対向部２２１および第２の対向部２２２に接合される。 On the other hand, the plastically fluidized portion of the steel circular tubular portion 110 expands the pipe thickness toward the first facing portion 221 of the cast iron circular tubular portion 210 so as to narrow the gap G with the second facing portion 222. It approaches the second facing portion 222 while moving. Then, the plastically fluidized portion of the steel cylindrical portion 110 deforms from the first facing portion 221 to the second facing portion 222 via the curved portion 223, and when the friction welding is completed, As shown in FIG. 2 , the pipe thickening portion 120 formed by the plastically fluidized portion is joined to the first facing portion 221 and the second facing portion 222 .

ここで、一般的に、鋳鉄製円管状部２１０の融点は、鋼製円管状部１１０の融点よりも低い。摩擦圧接中の鋳鉄製円管状部２１０と鋼製円管状部１１０との接触部分の温度を鋳鉄製円管状部２１０の融点よりも高く、かつ、鋼製円管状部１１０の融点よりも低く保持すれば、鋳鉄製円管状部２１０の融点を超えた部分は、摩擦圧接中に溶融し飛散するので、バリ等の突起が生じにくい。また、鋳鉄製円管状部２１０に摩擦圧接される鋼製円管状部１１０は融点を超えない程度に加熱されるので、塑性流動化しつつ管厚を拡大させることで接合前の管厚よりも大きい管厚で鋳鉄製円管状部２１０の第１の対向部２２１に接合されるとともに、湾曲部２２３を経由して第２の対向部２２２にも接合される。したがって、接合強度の高い接合体１０を製造することができる。 Here, generally speaking, the melting point of the cast-iron tubular portion 210 is lower than the melting point of the steel tubular portion 110 . The temperature of the contact portion between the cast iron tubular portion 210 and the steel tubular portion 110 during friction welding is kept higher than the melting point of the cast iron tubular portion 210 and lower than the melting point of the steel tubular portion 110. Then, the portion of the cast-iron cylindrical portion 210 having a melting point exceeding the melting point melts and scatters during friction welding, so projections such as burrs are less likely to occur. In addition, since the steel circular tubular portion 110 that is friction-welded to the cast iron circular tubular portion 210 is heated to an extent that does not exceed the melting point, the pipe thickness is increased while being plastically fluidized, so that the pipe thickness becomes larger than the pipe thickness before joining. It is joined to the first opposing portion 221 of the cast iron circular tubular portion 210 with the pipe thickness, and is also joined to the second opposing portion 222 via the curved portion 223 . Therefore, the joined body 10 with high joint strength can be manufactured.

なお、図４に示したように、鋼製円管状部１１０の外周には、突起部（バリ）１２３が形成されるが、突起部１２３は、鋳鉄製円管状部２１０の外径にあわせて削り取るなどして除去することができる。これにより、接合体１０の意匠性を高め、突起部１２３による取扱時のケガを防止するとともに、接合体１０の省スペース化および軽量化を図ることができる。 In addition, as shown in FIG. 4 , a protrusion (burr) 123 is formed on the outer circumference of the steel cylindrical portion 110 , and the protrusion 123 is adjusted to the outer diameter of the cast iron cylindrical portion 210 It can be removed by scraping. As a result, it is possible to enhance the design of the joined body 10, prevent injuries during handling due to the protrusions 123, and achieve space saving and weight reduction of the joined body 10. FIG.

次に、接合体１０の変形例について図５を用いて説明する。図５は、変形例に係る接合体１０の断面図である。図５に示すように、変形例に係る接合体１０は、鋳鉄製円管状部２１０Ａが、第１の対向部２２１から遠ざかるにつれて鋼製円管状部１１０との隙間Ｇを広げるように第１の方向Ｄ１に対して傾斜した傾斜部２２２Ａを含む点で、図２に示した接合体１０とは異なる。なお、変形例に係る接合体１０も、図３および図４に示した接合手順を経ることで製造することができる。 Next, a modified example of the joined body 10 will be described with reference to FIG. FIG. 5 is a cross-sectional view of a joined body 10 according to a modification. As shown in FIG. 5 , in the joined body 10 according to the modification, the cast-iron circular tubular portion 210A expands the gap G with the steel circular tubular portion 110 as the distance from the first opposing portion 221 increases. It differs from the joined body 10 shown in FIG. 2 in that it includes an inclined portion 222A that is inclined with respect to the direction D1. Note that the bonded body 10 according to the modification can also be manufactured through the bonding procedure shown in FIGS.

図５に示したように、鋳鉄製円管状部２１０Ａの傾斜部２２２Ａは、第１の方向Ｄ１に対してα（０度＜α＜９０度）だけ傾斜している。すなわち、傾斜部２２２Ａは、第１の対向部２２１から、第１の方向Ｄ１に対してαだけ傾斜する方向に突出している。このように、第２の対向部２２２は、第１の対向部２２１から遠ざかるにつれて鋼製円管状部１１０との隙間Ｇを広げるように傾斜した傾斜部２２２Ａを含むため、鋼製円管状部１１０の塑性流動化した部分を傾斜部２２２Ａに沿って這わせやすい。したがって、第２の接合部１２２の接合領域を一層拡大させやすい。さらに、管厚拡大部１２０を傾斜部２２２Ａに沿って接合させることで、第１の方向Ｄ１に対する第２の接合部１２２の傾斜を緩勾配化することができる。このため、第２の接合部１２２が第２の対向部２２２から過剰な反力を受けることを抑制しやすい。したがって、第１の対向部２２１に対して第１の接合部１２１の接合位置がずれたり接合が剥がれたりする事態を抑制しやすい。なお、αの大きさは一定でなくてもよく、第１の対向部２２１から遠ざかるにつれて徐々に大きくしたり、小さくしたりするようにしてもよい。 As shown in FIG. 5, the inclined portion 222A of the cast iron cylindrical portion 210A is inclined by α (0 degrees<α<90 degrees) with respect to the first direction D1. That is, the inclined portion 222A protrudes from the first facing portion 221 in a direction inclined by α with respect to the first direction D1. In this way, since the second facing portion 222 includes the inclined portion 222A that is inclined so as to widen the gap G with the steel cylindrical portion 110 as it moves away from the first facing portion 221, the steel cylindrical portion 110 It is easy to make the plastically fluidized portion of the tape run along the inclined portion 222A. Therefore, it is easier to further expand the bonding area of the second bonding portion 122 . Furthermore, by joining the thickened pipe portion 120 along the inclined portion 222A, the inclination of the second joint portion 122 with respect to the first direction D1 can be made gentle. Therefore, it is easy to prevent the second joint portion 122 from receiving an excessive reaction force from the second facing portion 222 . Therefore, it is easy to suppress a situation in which the bonding position of the first bonding portion 121 is displaced from the first opposing portion 221 or the bonding is peeled off. Note that the magnitude of α may not be constant, and may be gradually increased or decreased as the distance from the first facing portion 221 increases.

次に、図２に示した鋳鉄製円管状部２１０を軸方向の鋼製円管状部１１０側からみた形状について図６を用いて説明する。図６は、鋼製円管状部１１０と摩擦圧接する前の状態における鋳鉄製円管状部２１０のみを抜き出して示す正面図である。 Next, the shape of the cast iron circular tubular portion 210 shown in FIG. 2 when viewed from the steel circular tubular portion 110 side in the axial direction will be described with reference to FIG. FIG. 6 is a front view showing only the cast-iron circular tubular portion 210 in a state before it is friction-welded with the steel circular tubular portion 110 .

図６に示すように、第２の対向部２２２は、周方向Ｄ２に途切れることなく、連続的に形成されている。このため、第２の対向部２２２は、湾曲部２２３を介して第１の対向部２２１に対して周方向Ｄ２の全周にわたり繋がっている。このように、第２の対向部２２２は、周方向Ｄ２に連続的に形成されているため、第２の対向部２２２と鋼製円管状部１１０（図２等参照）との接合領域を拡大させることができる。したがって、鋳鉄製円管状部２１０と鋼製円管状部１１０との接合強度を向上させることができる。 As shown in FIG. 6, the second facing portion 222 is formed continuously without any break in the circumferential direction D2. Therefore, the second facing portion 222 is connected to the first facing portion 221 via the curved portion 223 over the entire circumference in the circumferential direction D2. In this way, since the second facing portion 222 is formed continuously in the circumferential direction D2, the joint area between the second facing portion 222 and the steel cylindrical portion 110 (see FIG. 2 etc.) is enlarged. can be made Therefore, the joint strength between the cast iron tubular portion 210 and the steel tubular portion 110 can be improved.

次に、図６に示した鋳鉄製円管状部２１０の変形例について図７を用いて説明する。図７は、鋳鉄製円管状部２１０の変形例を示す正面図である。図７に示すように、変形例に係る鋳鉄製円管状部２１０Ａは、第２の対向部２２２が周方向Ｄ２に部分的に途切れ、断続的に形成されている点で、図６に示した鋳鉄製円管状部２１０とは異なる。なお、図７には、中心線Ｌ１に対する角度幅が４５度である第２の対向部２２２を、４５度間隔で４個設けた場合を示したが、第２の対向部２２２の角度幅や、間隔、個数については図７に示した場合に限られない。 Next, a modified example of the cast-iron tubular portion 210 shown in FIG. 6 will be described with reference to FIG. FIG. 7 is a front view showing a modification of the cast-iron tubular portion 210. As shown in FIG. As shown in FIG. 7, the cast-iron circular tubular portion 210A according to the modified example has the second facing portion 222 that is partially interrupted in the circumferential direction D2, and is intermittently formed. It is different from the cast-iron tubular portion 210 . FIG. 7 shows a case where four second facing portions 222 having an angular width of 45 degrees with respect to the center line L1 are provided at intervals of 45 degrees. , intervals, and number are not limited to those shown in FIG.

なお、上述した実施形態では、接合体１０を、図１に例示した構造物１に適用する場合について説明したが、接合体１０は、産業用ロボットのロボットアーム等に適用してもよい。上記したように、鋳鉄製円管状部２１０の第２の対向部２２２は、鋼製円管状部１１０の管厚拡大部１２０を内周側から覆っているため、摩擦圧接完了後に接合体１０の内部にバリ等の突起が突出することを防止することができる。したがって、接合体１０の内部にケーブル等を収容した場合であっても、ケーブル等に損傷を与えることを抑制することができる。 In the above-described embodiment, the joint 10 is applied to the structure 1 illustrated in FIG. 1, but the joint 10 may be applied to a robot arm of an industrial robot or the like. As described above, since the second facing portion 222 of the cast-iron circular tubular portion 210 covers the thickened pipe portion 120 of the steel circular tubular portion 110 from the inner peripheral side, the joined body 10 is It is possible to prevent projections such as burrs from protruding inside. Therefore, even when a cable or the like is accommodated inside the joined body 10, damage to the cable or the like can be suppressed.

さらなる効果や変形例は、当業者によって容易に導き出すことができる。このため、本発明のより広範な態様は、以上のように表しかつ記述した代表的な実施例に限定されるものではない。したがって、添付の特許請求の範囲およびその均等物によって定義される総括的な発明の概念の精神または範囲から逸脱することなく、様々な変更が可能である。 Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the invention are not limited to the exemplary embodiments so represented and described. Accordingly, various changes may be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and equivalents thereof.

１ 構造物、 １０ 接合体、 １００ 鋼製部材、 １１０ 鋼製の円管状部（鋼製円管状部）、 １１５ 内周面、 １２０ 管厚拡大部、 １２１ 第１の接合部、 １２２ 第２の接合部、 １２３ 突起部、 ２００ 鋳鉄製部材、 ２１０ 鋳鉄製の円管状部（鋳鉄製円管状部）、 ２２１ 第１の対向部、 ２２２ 第２の対向部、 ２２２Ａ 傾斜部、 ２２３ 湾曲部、 ２５０ 基部、 ３００ 指示板、 Ｄ１ 第１の方向、 Ｄ２ 周方向、 Ｌ１ 中心線、 Ｇ 隙間。 1 Structure 10 Joined Body 100 Steel Member 110 Steel Cylindrical Portion (Steel Cylindrical Portion) 115 Inner Peripheral Surface 120 Thickness Enlarging Portion 121 First Joining Portion 122 Second Joining portion 123 Protruding portion 200 Cast iron member 210 Cast iron circular tubular portion (cast iron circular tubular portion) 221 First opposing portion 222 Second opposing portion 222A Inclined portion 223 Curved portion 250 base, 300 indicator, D1 first direction, D2 circumferential direction, L1 centerline, G gap.

Claims (3)

摩擦圧接により互いの軸方向に沿う第１の方向に接合される鋳鉄製の円管状部と鋼製の円管状部とを備え、
前記鋳鉄製の円管状部は、前記鋼製の円管状部に対して前記第１の方向に対向する第１の対向部と、
前記第１の対向部に連なるとともに前記鋼製の円管状部に対して内周側から隙間を隔てて対向する第２の対向部とを含み、
前記鋼製の円管状部は、摩擦圧接の際に塑性流動化した部分が前記第１の対向部に向けて前記隙間を狭めるように管厚を拡大させる管厚拡大部を含み、
前記管厚拡大部は、前記第１の対向部に接合される第１の接合部と、
前記第１の接合部に連なるとともに前記第２の対向部に接合される第２の接合部とを含み、
前記鋳鉄製の円管状部は、前記第１の対向部と前記第２の対向部とを繋ぐ湾曲部を含む、接合体。 A cast iron circular tubular portion and a steel circular tubular portion joined together in a first direction along the axial direction by friction welding,
The cast iron circular tubular portion has a first facing portion that faces the steel circular tubular portion in the first direction,
A second facing portion that is continuous with the first facing portion and faces the steel cylindrical portion from the inner peripheral side with a gap,
The cylindrical tubular portion made of steel includes a pipe-thickness-increasing portion that increases the pipe thickness so that the portion plastically fluidized during friction welding narrows the gap toward the first opposing portion,
The pipe thickening portion includes a first joint portion joined to the first facing portion;
a second joint connected to the first joint and joined to the second facing portion ;
The joined body , wherein the cast-iron tubular portion includes a curved portion that connects the first facing portion and the second facing portion . 摩擦圧接により互いの軸方向に沿う第１の方向に接合される鋳鉄製の円管状部と鋼製の円管状部とを備え、
前記鋳鉄製の円管状部は、前記鋼製の円管状部に対して前記第１の方向に対向する第１の対向部と、
前記第１の対向部に連なるとともに前記鋼製の円管状部に対して内周側から隙間を隔てて対向する第２の対向部とを含み、
前記鋼製の円管状部は、摩擦圧接の際に塑性流動化した部分が前記第１の対向部に向けて前記隙間を狭めるように管厚を拡大させる管厚拡大部を含み、
前記管厚拡大部は、前記第１の対向部に接合される第１の接合部と、
前記第１の接合部に連なるとともに前記第２の対向部に接合される第２の接合部とを含み、
前記第２の対向部は、前記第１の対向部から遠ざかるにつれて前記隙間を広げるように前記第１の方向に対して傾斜した傾斜部を含む、接合体。 A cast iron circular tubular portion and a steel circular tubular portion joined together in a first direction along the axial direction by friction welding,
The cast iron circular tubular portion has a first facing portion that faces the steel circular tubular portion in the first direction,
A second facing portion that is continuous with the first facing portion and faces the steel cylindrical portion from the inner peripheral side with a gap,
The cylindrical tubular portion made of steel includes a pipe-thickness-increasing portion that increases the pipe thickness so that the portion plastically fluidized during friction welding narrows the gap toward the first opposing portion,
The pipe thickening portion includes a first joint portion joined to the first facing portion;
a second joint connected to the first joint and joined to the second facing portion ;
The joined body , wherein the second facing portion includes an inclined portion inclined with respect to the first direction so as to widen the gap as the distance from the first facing portion increases . 前記第２の対向部は、周方向に連続的に形成されている、請求項１または２に記載の接合体。 The joined body according to claim 1 or 2 , wherein said second facing portion is formed continuously in the circumferential direction.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000288747A (en) 1999-04-09 2000-10-17 Hitachi Metals Ltd Friction welded member
JP2002004847A (en) 2000-06-19 2002-01-09 Aichi Mach Ind Co Ltd Catalyst case structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000288747A (en) 1999-04-09 2000-10-17 Hitachi Metals Ltd Friction welded member
JP2002004847A (en) 2000-06-19 2002-01-09 Aichi Mach Ind Co Ltd Catalyst case structure

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