JP2007136532A - Method for welding working machine component member and reinforcing member in construction equipment - Google Patents

Method for welding working machine component member and reinforcing member in construction equipment Download PDF

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JP2007136532A
JP2007136532A JP2005337299A JP2005337299A JP2007136532A JP 2007136532 A JP2007136532 A JP 2007136532A JP 2005337299 A JP2005337299 A JP 2005337299A JP 2005337299 A JP2005337299 A JP 2005337299A JP 2007136532 A JP2007136532 A JP 2007136532A
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reinforcing member
component
work
working machine
welding
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Toru Nakajima
徹 中嶋
Takeshi Takahashi
高橋　　毅
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Hitachi Construction Machinery Co Ltd
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Hitachi Construction Machinery Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for welding a working machine component and a reinforcing member in construction equipment, a method capable of fully maintaining a reinforcing function of the reinforcing member when the working machine component member is repeatedly subjected to a working load and also capable of suppressing concave deformation of both members after the welding. <P>SOLUTION: In the method of welding one face 5a of the reinforcing member 5 to one face 4a of the working machine component member 4 in construction equipment, the one face 4a of the working machine component member 4 and the peripheral part 5b of the reinforcing member 5 are fillet welded. Also, a weld zone 8 with deep penetration is formed penetrating to the working machine component member 4 by heating the other face of the reinforcing member 5. Then, a weld zone 9 with deep penetration is formed penetrating to the reinforcing member 5 by heating the other face of the working machine component member 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、建設機械の作業機構成部材の一方の面に補強部材の面を接合する建設機械の作業機構成部材と補強部材の接合方法に関する。   The present invention relates to a method for joining a working machine component of a construction machine and a reinforcing member, in which a surface of a reinforcing member is joined to one surface of the working machine component of the construction machine.

油圧ショベル、油圧クレーン、ホイールローダ等の建設機械は、各種建設作業を行うための独自の作業機を備えており、これらの作業機は、建設機械の反復使用により著大な負荷を繰り返し受ける。こうしたことから、従来、建設機械の作業機については、補強対策が種々提案されており、その対策の一つとして、作業機の構成部材の一方の面に補強部材を接合する方法が知られている。本発明は、こうした建設機械の作業機構成部材と補強部材の接合方法を改良しようとするものである。   Construction machines such as a hydraulic excavator, a hydraulic crane, and a wheel loader have their own work machines for performing various construction work, and these work machines repeatedly receive a significant load due to repeated use of the construction machines. For these reasons, various reinforcement measures have conventionally been proposed for construction machine work machines, and as one of the measures, a method of joining a reinforcement member to one surface of a component of the work machine is known. Yes. The present invention intends to improve the method for joining the working machine component of the construction machine and the reinforcing member.

そこで、後述する本発明の理解を容易にするため、建設機械の代表である油圧ショベルを例にして、この油圧ショベルの概要及びこれの作業機や従来知られていた作業機構成部材と補強部材の接合方法を、図１０乃至図１４に基づいて以下に説明する。図１０は、従来の一般的な油圧ショベルの全体像を示す斜視図、図１１は、従来の一般的な建設機械の作業機構成部材と補強部材の接合方法を示す平面図、図１２は、従来の一般的な建設機械の作業機構成部材と補強部材の接合方法を示す縦断面図、図１３は、図１２の建設機械の作業機構成部材と補強部材の接合方法の問題点を説明するための縦断面図である。   Therefore, in order to facilitate understanding of the present invention, which will be described later, a hydraulic excavator that is a representative of construction machinery is taken as an example, an outline of the hydraulic excavator, its working machine, and conventionally known working machine components and reinforcing members. The joining method will be described below with reference to FIGS. FIG. 10 is a perspective view showing an entire image of a conventional general hydraulic excavator, FIG. 11 is a plan view showing a method of joining a working machine component member and a reinforcing member of a conventional general construction machine, and FIG. FIG. 13 is a longitudinal sectional view showing a conventional method for joining a work machine component and a reinforcement member of a general construction machine, and FIG. 13 illustrates a problem of the method of joining a work machine component and a reinforcement member of a construction machine in FIG. FIG.

まず、図１０に基づき、油圧ショベルの概要及びこれの作業機について概説する。Ａは上部旋回体Ｂを設置するための基台となりエンドレスチェーン状のクローラベルトにより作業現場を走行する下部走行体、Ｂはこの下部走行体Ａ上に旋回可能に設置された上部旋回体、Ｃは後述するブーム１、アーム２及びバケット３を設けて構成され掘削作業や掘削土砂の積載作業等の種々の建設作業を行う油圧ショベルの作業機、Ｄは油圧ショベルの操縦を行うための運転室、Ｅはカウンタウェイトである。   First, an outline of a hydraulic excavator and its working machine will be outlined based on FIG. A is a base for installing the upper revolving unit B, and is a lower traveling unit that travels on the work site by an endless chain-shaped crawler belt. B is an upper revolving unit that is installed on the lower traveling unit A so as to be rotatable. Is a working machine of a hydraulic excavator configured to be provided with a boom 1, an arm 2 and a bucket 3 which will be described later, and performs various construction work such as excavation work and excavating earth and sand loading work, D is a cab for operating the hydraulic excavator , E is a counter weight.

上部旋回体Ｂは、下部走行体Ａ上た、図に表れていない旋回装置で旋回可能に支持されている。この上部旋回体Ｂは、上部施回体Ｂの基盤をなす碇回フレームと、この旋回フレーム上に設置した油圧ポンプ及びエンジン等の油圧駆動・制御用の機器や運転室、カウンタウェイト等の諸装置とで構成された集合体を指称する。油圧ショベルは、大別すると、こうした上部碇回体Ｂ及び下部走行体Ａと、旋回フレーム上に設置した作業機Ｃとで構成されている。油圧ショベルの作業機Ｃは、アーム２に取り付けて使用する用具として、バケット３のほか、このバケット３と交換使用するクラムシェルやブレーカや小割機等の用具（図示せず。）もアタッチメントとして備えている。   The upper turning body B is supported on the lower traveling body A by a turning device (not shown) so as to be turned. The upper rotating body B includes a winding frame that forms the base of the upper rotating body B, various hydraulic drive / control devices such as a hydraulic pump and an engine installed on the rotating frame, a driver's cab, a counterweight, and the like. An assembly composed of devices is designated. The hydraulic excavator is roughly divided into an upper winding body B and a lower traveling body A, and a work machine C installed on a turning frame. The working machine C of the hydraulic excavator is a tool used by being attached to the arm 2, and a tool (not shown) such as a clamshell, a breaker or a split machine used in exchange for the bucket 3 is also an attachment. I have.

１は後端部が旋回フレームの前部に垂直方向に回動（傾勤）可能にピンで軸着されて設置されたブーム、２は後端部がこのブーム１の前端部に垂直方向に回勤（揺勤）可能にピンで軸着されたアーム、３はこのアーム４の前端部に垂直方向に回動可能にかつ着脱可能にピンで軸着されたバケット、１ａは旋回フレーム側及びブーム１側にそれぞれピンで軸着され伸縮させてブーム１を回動させるように駆動するブームシリング、２ａはブーム１側及びアーム２側にそれぞれピンで軸着され伸縮させてアーム２を回動させるように駆動するアームシリング、３ａはアーム２側及びバケット３側のリンクにそれぞれピンで軸着され伸縮させてバケット３を回動させるように駆動するバケットシリンダである。   Reference numeral 1 denotes a boom that is pivotally mounted with a pin so that the rear end portion can be rotated (tilted) in the vertical direction at the front portion of the revolving frame, and 2 is a rear end portion that is perpendicular to the front end portion of the boom 1. Arm pivotally mounted with a pin so that it can be relocated (moved) 3 is a bucket pivotally mounted with a pin so that it can be pivoted in a vertical direction and detachably on the front end of this arm 4, Boom shillings that are pivotally attached to the boom 1 side and are driven to extend and retract to rotate the boom 1, 2a is attached to the boom 1 side and the arm 2 side by pins and are extended and retracted to rotate the arm 2 An arm shilling 3a that drives the bucket 3 is a bucket cylinder that is pivotally attached to a link on the arm 2 side and the bucket 3 side with a pin, and is driven to expand and contract to rotate the bucket 3.

ブーム１やアーム２は、その強度を向上させるため、通常、上板と下板と両側板とから構成されて箱型構造をなしている。油圧ショベルの作業機Ｃにおけるこの種の作業腕の構造は、例えば特許文献１に記載されている。こうした箱型構造の作業腕は、これに加わる作業負荷に耐え得るように設計することが必要であることに加え、油圧ショベルの作動速度の向上（作業性の向上）や燃費の向上等の観点から極力軽量化を図るように設計することが望ましい。油圧ショベルの作業機Ｃをなすバケット３や前記アタッチメントについても同様のことがいえる。こうしたブーム１やアーム２やバケット３等の作業具は、これに加わる作業負荷の程度が当該建設工事に関する地盤の状況や施工内容等により異なり、また、作業具の部位によっても異なる。   In order to improve the strength, the boom 1 and the arm 2 are usually composed of an upper plate, a lower plate, and both side plates and have a box structure. The structure of this type of working arm in the working machine C of a hydraulic excavator is described in Patent Document 1, for example. Such a box-type work arm needs to be designed so that it can withstand the work load applied to it. In addition, the operating speed of the excavator (improvement of workability) and the viewpoint of improvement of fuel consumption It is desirable to design so as to reduce the weight as much as possible. The same can be said for the bucket 3 constituting the working machine C of the hydraulic excavator and the attachment. In the work tools such as the boom 1, the arm 2, and the bucket 3, the degree of work load applied to the work tools varies depending on the ground conditions and construction contents related to the construction work, and also varies depending on the parts of the work tools.

こうしたことから、ブーム１やアーム２やバケット３等の作業具の補強対策として、当該建設工事の作業環境や作業内容を考慮しながら、その作業具の要所要所を適切な強度の補強部材で局部的に補強する方法が従来実施されていた。この補強方法は、作業機構成部材（作業具を構成する部材）中の著大な応力が作用する個所における内外表面のうちの一方の面（通常は外表面）に板状の補強部材を溶接により接合して重点的に補強する方法である。作業機構成部材のうち、こうした著大な応力が作用する個所は、一般的には、ブーム１、アーム２、バケット３の隣接するもの同士が軸着されているピン回りの個所やブームシリンダ１ａ、アームシリンダ２ａ、バケットシリンダ３ａが軸着されているピン回りの個所を挙げることができる。油圧ショベルの作業機Ｃにおけるこの種の作業具の補強方法は、例えば特許文献２及び特許文献３に記載されている。   For this reason, as a measure to reinforce the work tools such as the boom 1, the arm 2, and the bucket 3, the necessary parts of the work tools are strengthened with appropriate strength while considering the work environment and work contents of the construction work. A method of locally reinforcing has been practiced in the past. In this reinforcing method, a plate-shaped reinforcing member is welded to one of the inner and outer surfaces (usually the outer surface) of the work machine component (member constituting the work implement) where a significant stress acts. This is a method of reinforcement by joining by reinforced. Of the working machine components, the locations where such significant stress acts are generally the locations around the pins where the adjacent ones of the boom 1, the arm 2 and the bucket 3 are axially attached, and the boom cylinder 1a. Examples of the area around the pin on which the arm cylinder 2a and the bucket cylinder 3a are pivotally mounted can be mentioned. For example, Patent Literature 2 and Patent Literature 3 describe a method of reinforcing a working tool of this type in the working machine C of the excavator.

こうした作業具の補強方法においては、補強部材の溶接を図１１及び図１２に示すような方法により通常行っていた。すなわち、作業機構成部材４の一方の面４ａに板状の補強部材５を接合するが、その場合、補強部材５の一方の面５ａを作業機構成部材４の一方の面４ａに重ね合わせて位置決めした後、図１１及び図１２に示すように、作業機構成部材４の一方の面４ａと補強部材５の周縁部５ｂとの間を、周縁部５ｂの全周にわたって隅肉溶接していた。図１１及び図１２中、符号６は、作業機構成部材４と補強部材５とを隅肉溶接したときに形成されたビードを表す。   In such a method for reinforcing a work tool, welding of the reinforcing member is usually performed by a method as shown in FIGS. That is, the plate-like reinforcing member 5 is joined to the one surface 4 a of the work implement constituent member 4. In this case, the one surface 5 a of the reinforcing member 5 is overlapped with the one surface 4 a of the work implement constituent member 4. After the positioning, as shown in FIGS. 11 and 12, fillet welding was performed between the one surface 4a of the work implement component 4 and the peripheral portion 5b of the reinforcing member 5 over the entire periphery of the peripheral portion 5b. . In FIG.11 and FIG.12, the code | symbol 6 represents the bead formed when the work implement structural member 4 and the reinforcement member 5 were fillet welded.

この図１１及び図１２に示すような補強部材の接合方法にあっては、補強部材５の周縁部５ｂが作業機構成部材４にビード６で接合されているものの、補強部材５の面５ａは、これと対向する作業機構成部材４の面４ａに全く接合されていない。そのため、作業機構成部材４に作業負荷が加えられて、例えば曲げ荷重が作用すると、作業機構成部材４が曲がろうとするのに対し、補強部材５は、現形状を保持しようとして、両部材４，５間に相対変位が生じ、その結果、ビード６の付近に応力集中が発生する。また、作業負荷により作業機構成部材４に捩じり荷重が作用したときも同様である。そして、作業機Ｃの反復使用によりこうした作業負荷を繰り返し受けると、やがて、ビード６やその傍の作業機構成部材４には、前記の応力集中により、図１３に示すような疲労破壊による亀裂７が生じ、補強部材５が補強機能を十分に維持することができなくなる可能性がある。   In the reinforcing member joining method as shown in FIGS. 11 and 12, the peripheral portion 5 b of the reinforcing member 5 is joined to the work machine component 4 by the bead 6, but the surface 5 a of the reinforcing member 5 is , It is not joined at all to the surface 4a of the work machine component 4 facing this. Therefore, when a work load is applied to the work implement constituent member 4 and, for example, a bending load is applied, the work implement constituent member 4 tends to bend, whereas the reinforcing member 5 tries to maintain the current shape, As a result, a relative concentration is generated between the beads 4 and 5, and as a result, stress concentration occurs in the vicinity of the bead 6. The same applies when a torsional load acts on the work implement component 4 due to the work load. When such a work load is repeatedly received by the repeated use of the work machine C, the bead 6 and the work machine component 4 near the bead 6 are eventually cracked due to fatigue failure as shown in FIG. May occur, and the reinforcing member 5 may not be able to sufficiently maintain the reinforcing function.

こうした問題の発生を防止するには、補強部材５の面５ａとこれに対向する作業機構成部材４の面４ａとを溶接すればよく、こうした面４ａ、５ａ同士の溶接に適した溶接法として、特許文献４に記載の高エネルギ密度ビームによる溶接方法が知られている。この溶接方法は、重ね合わせた二つの部材を溶接するのに使用するものであり、単位面積当たりのエネルギ密度がアーク溶接よりも著しく高く収束度の大きい電子ビームやレーザのような高エネルギ密度ビームにより溶接するものである。すなわち、重ね合わせた二つの部材の片側の一方の部材から高エネルギ密度ビームにより熱を加えて他方の部材まで溶け込ませた深溶け込み溶接部を形成し、これにより、重ね合わせた二つの部材を溶接しようとするものである。
特開２００１−１１５４８１公報（第２−３頁、図２，６） 特開平６−２２０８８４号公報（第２−３頁、図２−６） 特開２００１−２７１３７１公報（第２−５頁、図１−１１） 特開平６−１９０５７３号公報（第３頁、図１−４） In order to prevent the occurrence of such a problem, the surface 5a of the reinforcing member 5 and the surface 4a of the work implement component member 4 facing the reinforcing member 5 may be welded. As a welding method suitable for welding the surfaces 4a and 5a. A welding method using a high energy density beam described in Patent Document 4 is known. This welding method is used to weld two superposed members. The energy density per unit area is significantly higher than that of arc welding and has a high degree of convergence. Welding by. That is, a deep penetration weld is formed by applying heat from one member on one side of the two superimposed members to the other member by applying heat with a high energy density beam, thereby welding the two superimposed members It is something to try.
JP 2001-115481 A (page 2-3, FIGS. 2 and 6) Japanese Patent Laid-Open No. 6-220884 (page 2-3, FIG. 2-6) JP 2001-271371 A (page 2-5, FIG. 1-11) Japanese Patent Laid-Open No. 6-190573 (page 3, FIG. 1-4)

この特許文献４に記載の溶接方法を作業機構成部材４への補強部材５の溶接に適用した場合、作業機構成部材４が凹形に変形する恐れがある（後述する図２も参照のこと）。すなわち、特許文献４に記載の溶接方法は、重ね合わせた二つの部材の片側の一方の部材から熱を加えて溶接部を形成する方法であるため、作業機構成部材４及び補強部材５のうちの一方の部材である例えば補強部材５側から熱を加えて溶接部を形成すると、特に入熱の多い補強部材５側が膨張し、次いで、溶接部を自然冷却する過程で収縮する。そして、この補強部材５側の収縮過程で補強部材５が凹形に変形しようとし、これ伴って、他方の部材である作業機構成部材４も凹状にわん曲する。そのため、溶接部の冷却工程後に、こうした作業機構成部材４や補強部材５の変形を修正することが必要となり、補強部材５の接合工程における工数の増加が避けられない。   When the welding method described in Patent Document 4 is applied to welding of the reinforcing member 5 to the work implement constituent member 4, the work implement constituent member 4 may be deformed into a concave shape (see also FIG. 2 described later). ). That is, since the welding method described in Patent Document 4 is a method of forming a welded portion by applying heat from one member on one side of two superimposed members, of the work implement constituent member 4 and the reinforcing member 5. For example, when heat is applied from one side of the reinforcing member 5 side to form a welded portion, the side of the reinforcing member 5 with particularly high heat input expands, and then shrinks in the process of naturally cooling the welded portion. Then, the reinforcing member 5 tends to deform into a concave shape during the contraction process on the side of the reinforcing member 5, and accordingly, the work machine component 4 as the other member is also bent into a concave shape. For this reason, it is necessary to correct the deformation of the working machine component 4 and the reinforcing member 5 after the cooling process of the welded portion, and an increase in man-hours in the joining process of the reinforcing member 5 is inevitable.

本発明は、こうした従来の技術に関する問題を解決するために創作されたものであり、その技術的課題は、作業機構成部材に補強部材を溶接する建設機械の作業機構成部材と補強部材の接合方法において、作業機構成部材が作業負荷を繰り返し受けても補強部材の補強機能を十分に維持することができ、かつ、両部材が溶接後に凹状に変形するのを抑制できる建設機械の作業機構成部材と補強部材の接合方法を提供することにある。   The present invention was created in order to solve such problems related to the prior art, and the technical problem is to join the work implement component and the reinforcement member of the construction machine in which the reinforcement member is welded to the work implement component. In the method, the working machine configuration of a construction machine that can sufficiently maintain the reinforcing function of the reinforcing member even when the working machine constituent member repeatedly receives a work load, and can suppress the deformation of both the members into a concave shape after welding. It is in providing the joining method of a member and a reinforcement member.

本発明は、こうした技術的課題を達成するため、
建設機械の作業機構成部材の一方の面に補強部材の一方の面を接合する建設機械の作業機構成部材と補強部材の接合方法において、作業機構成部材の一方の面と補強部材の周縁部とを隅肉溶接するほか、補強部材の他方の面から熱を加えて作業機構成部材まで溶け込ませた深溶け込み溶接部を形成するとともに、作業機構成部材の他方の面から熱を加えて補強部材まで溶け込ませた深溶け込み溶接部を形成して、作業機構成部材に補強部材を接合するようにしたことを特徴とする。 In order to achieve these technical problems, the present invention
In a method of joining a work machine component and a reinforcement member of a construction machine, which joins one surface of the reinforcement member to one surface of the work machine component of the construction machine, the one surface of the work machine component and the peripheral portion of the reinforcement member In addition to forming fillet welds, heat is applied from the other surface of the reinforcing member to form a deep penetration weld that is melted to the work implement component, and heat is applied from the other surface of the work implement component to reinforce. A deep penetration weld that has been melted to the member is formed, and the reinforcing member is joined to the work implement component.

本発明に係る建設機械の作業機構成部材と補強部材の接合方法では、作業機構成部材の一方の面と補強部材の周縁部とを隅肉溶接するほか、補強部材の他方の面から熱を加えて作業機構成部材まで溶け込ませた深溶け込み溶接部を形成しているので、補強部材は、作業機構成部材に対して周縁部だけではなく、作業機構成部材に対向する面も接合されている。そのため、作業機構成部材が作業負荷を受けても、補強部材との間に相対変位が生じにくく、隅肉溶接によるビードの付近に応力集中が発生するのを抑止することができる。その結果、建設機械の反復使用により作業機構成部材が作業負荷を繰り返し受けても、隅肉溶接によるビードの付近に、応力集中に起因する疲労破壊による亀裂を生じにくくすることができる。   In the method for joining the working machine component and the reinforcing member of the construction machine according to the present invention, in addition to fillet welding one surface of the working machine component and the peripheral portion of the reinforcing member, heat is applied from the other surface of the reinforcing member. In addition, since the deep penetration welded portion that has been melted to the work implement component is formed, the reinforcing member is joined not only to the peripheral portion but also to the work implement component in the surface facing the work implement component. Yes. Therefore, even if the work implement component receives a work load, relative displacement is unlikely to occur with the reinforcing member, and stress concentration can be prevented from occurring near the bead by fillet welding. As a result, even if the work implement constituent member repeatedly receives a work load due to repeated use of the construction machine, cracks due to fatigue failure due to stress concentration can be less likely to occur near the bead by fillet welding.

加えて、本発明に係る建設機械の作業機構成部材と補強部材の接合方法では、補強部材の他方の面から熱を加えるだけではなく、作業機構成部材の他方の面からも熱を加えて補強部材まで溶け込ませた深溶け込み溶接部を形成しているので、深溶け込み溶接部を形成する過程で、作業機構成部材及び補強部材の双方の部材に入熱による膨張と冷却による収縮がもたらされる。そのため、深溶け込み溶接部の形成時に作業機構成部材と補強部材の双方に加わる応力のバランスが保たれて、両部材が溶接後に凹状に変形するのを抑制することができる。また、このように作業機構成部材の他方の面からも熱を加えて深溶け込み溶接部を形成しているので、作業機構成部材と補強部材の対向する面同士の接合が一層強固に行われ、このことによって、隅肉溶接によるビードの付近に応力集中が発生するのを一層効果的に抑止することができる。   In addition, in the method for joining the working machine component and the reinforcing member of the construction machine according to the present invention, not only heat is applied from the other surface of the reinforcing member, but also heat is applied from the other surface of the working machine component. Since the deep penetration weld that has been melted to the reinforcing member is formed, both the working machine component and the reinforcing member are expanded by heat input and contracted by cooling in the process of forming the deep penetration weld. . Therefore, the balance of the stress applied to both the work implement component member and the reinforcing member at the time of forming the deep penetration welded portion can be maintained, and the two members can be prevented from being deformed into a concave shape after welding. In addition, since the deep penetration weld is formed by applying heat also from the other surface of the work implement constituent member, the opposing surfaces of the work implement constituent member and the reinforcing member are joined more firmly. This makes it possible to more effectively suppress the occurrence of stress concentration in the vicinity of the bead due to fillet welding.

以上要するに、この作業機構成部材と補強部材の接合方法によれば、作業機構成部材に補強部材を溶接する建設機械の作業機構成部材と補強部材の接合方法において、作業機構成部材が作業負荷を繰り返し受けても補強部材の補強機能を十分に維持することができ、かつ、両部材が溶接後に凹状に変形するのを抑制することができる。   In short, according to the joining method of the working machine component and the reinforcing member, in the joining method of the working machine component and the reinforcing member of the construction machine for welding the reinforcing member to the working machine component, the working machine component is a work load. Even if it receives repeatedly, the reinforcement function of a reinforcement member can fully be maintained, and it can suppress that both members deform | transform into a concave shape after welding.

以下の説明から明らかなように、本発明に係る建設機械の作業機構成部材と補強部材の接合方法は、前記〔課題を解決するための手段〕の項に示した方法を採用しているので、作業機構成部材に補強部材を溶接する建設機械の作業機構成部材と補強部材の接合方法において、作業機構成部材が作業負荷を繰り返し受けても補強部材の補強機能を十分に維持することができ、かつ、両部材が溶接後に凹状に変形するのを抑制することができる。その結果、こうした作業機構成部材と補強部材の溶接後に、溶接時の入熱による両部材の変形を修正するするための作業負担を軽減することができる。   As will be apparent from the following description, the method for joining the working machine constituent member and the reinforcing member of the construction machine according to the present invention employs the method described in the above section [Means for Solving the Problems]. In a method for joining a work implement component and a reinforcement member of a construction machine that welds a reinforcement member to the work implement component, the reinforcement function of the reinforcement member can be sufficiently maintained even when the work implement component receives a work load repeatedly. It is possible to suppress deformation of both members into a concave shape after welding. As a result, it is possible to reduce the work load for correcting the deformation of both members due to heat input during welding after welding of the work implement component and the reinforcing member.

本発明に係る建設機械の作業機構成部材と補強部材の接合方法を具体化する場合に、特に、特許請求の範囲の請求項２に記載のように具体化すれば、溶け込み幅が狭く、溶け込み深さが深いキーホール溶接が可能となる。その結果、作業機構成部材や補強部材の所定の領域に深溶け込み溶接部を数多く形成することが可能となる。また、作業機構成部材や補強部材に加える熱も、アーク溶接に比べて少ないため、深溶け込み溶接部の形成時に作業機構成部材や補強部材内に生じる残留応力を低減することができるとともに、両部材の溶接に際し、溶接時間を短縮化して溶接作業の高速化を図ることができる。   In the case of embodying the method for joining the working machine constituent member and the reinforcing member of the construction machine according to the present invention, in particular, if embodied as described in claim 2 of the claims, the penetration width is narrow and the penetration Deep keyhole welding is possible. As a result, it is possible to form a large number of deep penetration welds in predetermined regions of the work implement constituent member and the reinforcing member. In addition, since the heat applied to the work implement constituent member and the reinforcing member is less than that of arc welding, the residual stress generated in the work implement constituent member and the reinforcing member at the time of forming the deep penetration weld portion can be reduced. When welding the members, the welding time can be shortened to speed up the welding operation.

本発明に係る建設機械の作業機構成部材と補強部材の接合方法を具体化する場合に、特に、特許請求の範囲の請求項３に記載のように具体化すれば、標準出力の溶接機を１台配備し、これを交互に使用して補強部材の他方の面と作業機構成部材の他方の面とから交互に熱を加えることにより、標準出力の１台の溶接機により両部材の他方の面からそれぞれ熱を加えて深溶け込み溶接部を形成することができる。そのため、この作業機構成部材と補強部材の接合方法を実施するための設備投資を安価に済ませることができる。   In the case of embodying the method of joining the working machine constituent member and the reinforcing member of the construction machine according to the present invention, in particular, if embodied as described in claim 3 of the claims, a standard output welding machine is provided. By deploying one unit and using this alternately, heat is alternately applied from the other side of the reinforcing member and the other side of the work implement component member, so that the other of the two members can be operated by one standard output welding machine. A deep penetration weld can be formed by applying heat from each of the surfaces. Therefore, the capital investment for implementing this joining method of the working machine component and the reinforcing member can be reduced at a low cost.

本発明に係る建設機械の作業機構成部材と補強部材の接合方法を具体化する場合に、特に、特許請求の範囲の請求項４に記載のように具体化すれば、補強部材の他方の面と作業機構成部材の他方の面とから同時に熱を加えて深溶け込み溶接部を形成することができるので、深溶け込み溶接部の形成時における作業機構成部材と補強部材とのヒートバランスが良くなる。そのため、この作業機構成部材と補強部材の接合方法を実施する過程における作業機構成部材と補強部材の加熱、冷却時間が均一となり、溶接後に両部材が凹状に変形するのをより確実に抑制することができる。   In the case of embodying the method of joining the working machine component and the reinforcing member of the construction machine according to the present invention, in particular, if embodied as described in claim 4 of the claims, the other surface of the reinforcing member And the other surface of the work implement component can be heated simultaneously to form a deep penetration weld, which improves the heat balance between the work implement component and the reinforcing member when forming the deep penetration weld . Therefore, heating and cooling times of the work implement constituent member and the reinforcing member in the process of performing the joining method of the work implement constituent member and the reinforcing member become uniform, and the deformation of both members into a concave shape after welding is more reliably suppressed. be able to.

以下、本発明が実際上どのように具体化されるのかを図１乃至図９を用いて説明することにより、本発明を実施するための望ましい形態を明らかにする。   Hereinafter, how the present invention is actually embodied will be described with reference to FIGS. 1 to 9 to clarify a desirable mode for carrying out the present invention.

以下に述べる本発明に係る建設機械の作業機構成部材と補強部材の接合方法に関する例は、何れも、建設機械の作業機構成部材４の一方の面４ａに補強部材５の一方の面５ａを接合する建設機械の作業機構成部材と補強部材の接合方法において、作業機構成部材４の一方の面４ａと補強部材５の周縁部５ｂとをビード６により隅肉溶接するほか、補強部材５の他方の面から熱を加えて作業機構成部材４まで溶け込ませた深溶け込み溶接部８を形成するとともに、作業機構成部材４の他方の面から熱を加えて補強部材５まで溶け込ませた深溶け込み溶接部９を形成して、作業機構成部材４に補強部材５を接合するようにしたものである。   In any of the examples relating to the joining method of the working machine component and the reinforcing member of the construction machine according to the present invention described below, the one surface 5a of the reinforcing member 5 is provided on the one surface 4a of the working machine component 4 of the construction machine. In the joining method of the working machine component and the reinforcing member of the construction machine to be joined, in addition to fillet welding the one surface 4a of the working machine component 4 and the peripheral edge 5b of the reinforcing member 5 with the bead 6, A deep penetration weld 8 is formed by applying heat from the other surface to the work implement component 4 and deep penetration by applying heat from the other surface of the work implement component 4 to the reinforcing member 5 A welding portion 9 is formed so that the reinforcing member 5 is joined to the work machine component 4.

まず、本発明に係る建設機械の作業機構成部材と補強部材の接合方法ついて、単純化された基本的な例を図１乃至図３に基づいて説明する。図１は、本発明に係る建設機械の作業機構成部材と補強部材の接合方法に関するシンプルな例を示す縦断面図、図２は、図１の作業機構成部材と補強部材の接合方法に関する作用効果を説明するための第１の比較例を示す縦断面図、図３は、図１の作業機構成部材と補強部材の接合方法に関する作用効果を説明するための第２の比較例を示す縦断面図である。これらの図において既述の図１１乃至図１３と同一の符号を付けた部分は、これら図１１乃至図１３と同等の部分を表すので、詳述しない。   First, a simplified basic example of a method for joining a working machine constituent member and a reinforcing member of a construction machine according to the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a longitudinal sectional view showing a simple example relating to a method of joining a working machine component and a reinforcing member of a construction machine according to the present invention, and FIG. 2 is an action relating to a method of joining the working machine component and the reinforcing member of FIG. FIG. 3 is a longitudinal sectional view showing a first comparative example for explaining the effect, and FIG. 3 is a longitudinal sectional view showing a second comparative example for explaining the operational effect relating to the joining method of the work implement constituent member and the reinforcing member of FIG. FIG. In these drawings, the portions denoted by the same reference numerals as those in FIGS. 11 to 13 described above represent the same portions as those in FIGS. 11 to 13 and will not be described in detail.

図１に示す建設機械の作業機構成部材と補強部材の接合方法の例では、作業機構成部材４の一方の面（外表面）４ａと補強部材５の周縁部５ｂとをビード６により隅肉溶接するほか、補強部材５の他方の面（外表面）から熱を加えて作業機構成部材４まで溶け込ませた深溶け込み溶接部８を、補強部材５の長手方向の左右両側に一つずつ形成している。また、作業機構成部材４の他方の面（内表面）から熱を加えて補強部材５まで溶け込ませた深溶け込み溶接部９を左右の深溶け込み溶接部８の中央位置に一つ形成しており、以上のビード６と深溶け込み溶接部８，９とにより作業機構成部材４に補強部材５を接合するようにしている。   In the example of the method of joining the working machine component of the construction machine and the reinforcing member shown in FIG. 1, the fillet is formed by connecting one surface (outer surface) 4 a of the working machine component 4 and the peripheral edge 5 b of the reinforcing member 5 with the bead 6. In addition to welding, deep penetration welds 8 are formed on each of the left and right sides of the reinforcing member 5 in the longitudinal direction by applying heat from the other surface (outer surface) of the reinforcing member 5 to the working machine component 4. is doing. Further, one deep penetration weld 9 is formed at the center of the left and right deep penetration welds 8 by applying heat from the other surface (inner surface) of the work implement component 4 to the reinforcement member 5. The reinforcing member 5 is joined to the work implement constituent member 4 by the beads 6 and the deep penetration welds 8 and 9 described above.

本建設機械の作業機構成部材と補強部材の接合方法では、作業機構成部材４の一方の面４ａと補強部材５の周縁部５ｂとを隅肉溶接するほか、補強部材５の他方の面及び作業機構成部材４の他方の面の双方から熱を加えて深溶け込み溶接部８，９をそれぞれ形成しているので、補強部材５は、作業機構成部材４に対して周縁部５ｂだけではなく、作業機構成部材４に対向する面も強固に接合される。そのため、作業機構成部材４が作業負荷を受けても、補強部材５との間に相対変位が生じにくく、隅肉溶接によるビード６の付近に応力集中が発生するのを効果的に抑止することができる。その結果、作業機Ｃの反復使用により作業機構成部材４が作業負荷を繰り返し受けても、ビード６の付近に、応力集中に起因する疲労破壊による亀裂７を生じにくくすることができる。   In the method of joining the working machine component of the construction machine and the reinforcing member, in addition to fillet welding the one surface 4a of the working machine component 4 and the peripheral edge 5b of the reinforcing member 5, the other surface of the reinforcing member 5 and Since the deep penetration welds 8 and 9 are formed by applying heat from both sides of the work implement component 4, the reinforcing member 5 is not only the peripheral portion 5 b with respect to the work implement component 4. The surface facing the work implement component 4 is also firmly joined. Therefore, even when the work implement component 4 receives a work load, relative displacement is unlikely to occur between the reinforcement member 5 and the stress concentration is effectively prevented from occurring near the bead 6 by fillet welding. Can do. As a result, even if the work implement constituent member 4 is repeatedly subjected to a work load by repeated use of the work implement C, it is possible to make it difficult for the crack 7 due to fatigue failure due to stress concentration to occur near the bead 6.

ところで、〔発明が解決しようとする課題〕の項ですでに述べたように、作業機構成部材４及び補強部材５のうちの一方の部材である例えば補強部材５側だけから熱を加えて深溶け込み溶接部８を形成すると、特に入熱の多い補強部材５側が膨張した後、冷却する過程で収縮する。そして、この補強部材５側の収縮過程で補強部材５が凹状に変形しようとし、これ伴って、図２に強調して図示するように、他方の部材である作業機構成部材４も凹状にわん曲する。そのため、溶接部の冷却工程後に、こうした作業機構成部材４や補強部材５の変形を修正することが必要となる。特に、作業機構成部材４と補強部材５の接合を強固に行うため、図３に示すように深溶け込み溶接部８を数多く形成すると、作業機構成部材４や補強部材５の変形も著しくなり、その変形の修正作業に多大の時間と労力を要する。   By the way, as already described in the section of [Problems to be Solved by the Invention], the depth is increased by applying heat only from one side of the work implement constituent member 4 and the reinforcing member 5, for example, the reinforcing member 5 side. When the penetration weld portion 8 is formed, the reinforcing member 5 side having a large amount of heat input expands and then contracts in the cooling process. The reinforcing member 5 tends to deform into a concave shape during the contraction process on the reinforcing member 5 side. Accordingly, as shown in FIG. 2 with emphasis, the work machine component 4 as the other member also has a concave shape. To sing. Therefore, it is necessary to correct the deformation of the working machine component 4 and the reinforcing member 5 after the cooling process of the welded portion. In particular, in order to firmly join the work implement constituent member 4 and the reinforcing member 5, when a large number of deep penetration welds 8 are formed as shown in FIG. 3, the work implement constituent member 4 and the reinforcing member 5 are significantly deformed, It takes a lot of time and labor to correct the deformation.

本建設機械の作業機構成部材と補強部材の接合方法では、図２や図３に示すように補強部材５の他方の面から熱を加えて深溶け込み溶接部８を形成するだけではなく、作業機構成部材４の他方の面からも熱を加えて深溶け込み溶接部９を形成しているので、深溶け込み溶接部８，９を形成する過程で、作業機構成部材４及び補強部材５の双方の部材に入熱による膨張と冷却による収縮がもたらされる。そのため、深溶け込み溶接部８，９の形成時に作業機構成部材４と補強部材５との双方に加わる応力のバランスが保たれて、両部材４，５が溶接後に凹状に変形するのを抑制することができる。その結果、作業機構成部材４と補強部材５の溶接後に、両部材４，５の変形を修正するするための作業負担を軽減することができる。   In the method of joining the working machine component of the construction machine and the reinforcing member, not only the deep penetration weld 8 is formed by applying heat from the other surface of the reinforcing member 5 as shown in FIGS. Since the deep penetration welded portion 9 is formed by applying heat also from the other surface of the machine component 4, both the work implement component 4 and the reinforcing member 5 are formed in the process of forming the deep penetration welds 8 and 9. This member is expanded by heat input and contracted by cooling. Therefore, the balance of the stress applied to both the work machine component 4 and the reinforcing member 5 when the deep penetration welds 8 and 9 are formed is kept, and the two members 4 and 5 are prevented from being deformed into a concave shape after welding. be able to. As a result, it is possible to reduce the work burden for correcting the deformation of the members 4 and 5 after welding the work implement constituent member 4 and the reinforcing member 5.

次に、本発明に係る建設機械の作業機構成部材と補強部材の接合方法について、これを実施する場合の種々の態様を図４乃至図９に基づいて説明する。   Next, regarding the method for joining the working machine component and the reinforcing member of the construction machine according to the present invention, various modes for carrying out this will be described with reference to FIGS.

図４は、本発明に係る建設機械の作業機構成部材と補強部材の接合方法において深溶け込み溶接部を高エネルギー密度溶接方法により形成した場合の例を示す縦断面図、図５は、本発明に係る建設機械の作業機構成部材と補強部材の接合方法において深溶け込み溶接部を形成する場合のプロセスを示す縦断面図、図６は、本発明に係る建設機械の作業機構成部材と補強部材の接合方法において深溶け込み溶接部を形成する場合の他のプロセスを示す縦断面図、図７は、本発明に係る建設機械の作業機構成部材と補強部材の接合方法を油圧ショベルのアームに具体化した例を示す斜視図、図８は、本発明に係る建設機械の作業機構成部材と補強部材の接合方法を油圧ショベルのバケットに具体化した例を示す斜視図、図９は、図８の油圧ショベルのバケットの底面図である。これらの図において既述の図１１乃至図１３と同一の符号を付けた部分は、これら図１１乃至図１３と同等の部分を表すので、詳述しない。   FIG. 4 is a longitudinal sectional view showing an example in which a deep penetration weld is formed by a high energy density welding method in the method for joining a working machine component member and a reinforcing member of a construction machine according to the present invention, and FIG. FIG. 6 is a longitudinal sectional view showing a process in the case of forming a deep penetration weld in the method of joining a construction machine working member and a reinforcing member of a construction machine according to FIG. 6, and FIG. FIG. 7 is a longitudinal sectional view showing another process when forming a deep penetration weld in the joining method of FIG. 7, and FIG. 7 shows the joining method of the construction machine working member and the reinforcing member of the construction machine according to the present invention in the arm of the hydraulic excavator FIG. 8 is a perspective view showing an example in which the method of joining the working machine constituent member and the reinforcing member of the construction machine according to the present invention is embodied in a bucket of a hydraulic excavator, and FIG. Hydraulic excavator It is a bottom view of the bucket. In these drawings, the portions denoted by the same reference numerals as those in FIGS. 11 to 13 described above represent the same portions as those in FIGS. 11 to 13 and will not be described in detail.

図４に示す建設機械の作業機構成部材と補強部材の接合方法は、深溶け込み溶接部８，９を形成する場合に、レーザ溶接に代表される高エネルギー密度溶接方法により形成するようにした例である。高エネルギー密度溶接とは、レーザ溶接、電子ビーム溶接、プラズマ溶接のようなパワー密度がアーク溶接の数十倍以上ある溶接のことであり、溶け込み幅が狭く、溶け込み深さが深いキーホール溶接を行うことができる。この図４に示す作業機構成部材と補強部材の接合方法は、こうした高エネルギー密度溶接により、深溶け込み溶接部８，９を補強部材５の長手方向の左右両側及び中央に形成している。   4 is an example in which the deep penetration welds 8 and 9 are formed by a high energy density welding method represented by laser welding. It is. High energy density welding is welding with a power density several tens of times that of arc welding, such as laser welding, electron beam welding, and plasma welding. Keyhole welding with a narrow penetration depth and deep penetration depth is used. It can be carried out. In the joining method of the working machine component and the reinforcing member shown in FIG. 4, deep penetration welds 8 and 9 are formed on the left and right sides and the center in the longitudinal direction of the reinforcing member 5 by such high energy density welding.

そのため、作業機構成部材４や補強部材５における限られた領域に、深溶け込み溶接部８，９を数多く形成することが可能となる。また、作業機構成部材４や補強部材５に加える熱も、アーク溶接に比べて少ないため、深溶け込み溶接部８，９の形成時に作業機構成部材４や補強部材５内に生じる残留応力を低減することができるとともに、両部材４，５の溶接に際し、アーク溶接の十倍以上溶接時間を短縮化することができて溶接作業の高速化を図ることができる。   Therefore, a large number of deep penetration welds 8 and 9 can be formed in a limited area in the work implement component 4 and the reinforcing member 5. Further, since the heat applied to the work implement constituent member 4 and the reinforcing member 5 is less than that of arc welding, the residual stress generated in the work implement constituent member 4 and the reinforcing member 5 when the deep penetration welds 8 and 9 are formed is reduced. In addition, when welding both members 4 and 5, the welding time can be shortened more than ten times that of arc welding, and the welding operation can be speeded up.

本発明に係る建設機械の作業機構成部材と補強部材の接合方法において、補強部材５の他方の面及び作業機構成部材４の他方の面からそれぞれ熱を加えて深溶け込み溶接部８，９を形成する場合に、第１番目の方法として、補強部材５の他方の面と作業機構成部材４の他方の面とから交互に熱を加えて深溶け込み溶接部８，９を形成する方法がある。図５は、こうした方法により深溶け込み溶接部８，９を形成する手順を示したものである。この方法を実施するに際しては、深溶け込み溶接部８，９を形成することが可能な標準出力の溶接機（図示せず。）を１台配備する。   In the method for joining the working machine component and the reinforcing member of the construction machine according to the present invention, heat is applied from the other surface of the reinforcing member 5 and the other surface of the working machine component 4 to respectively form the deep penetration welds 8 and 9. When forming, as a first method, there is a method of forming deep penetration welds 8 and 9 by alternately applying heat from the other surface of the reinforcing member 5 and the other surface of the work implement component 4. . FIG. 5 shows a procedure for forming the deep penetration welds 8 and 9 by such a method. In carrying out this method, one standard output welding machine (not shown) capable of forming deep penetration welds 8 and 9 is provided.

図５に基づき、前記の深溶け込み溶接部８，９を形成する手順を説明すると、まず、この溶接機により、補強部材５の他方の面から熱を加えて、図５（ａ）に示すように補強部材５の左側に深溶け込み溶接部８を形成する。次いで、その溶接機を作業機構成部材４側に置き換えて作業機構成部材４の他方の面から熱を加え、図５（ｂ）に示すように深溶け込み溶接部８の近傍に深溶け込み溶接部９を形成する。次いで、溶接機を補強部材５側に置き換えて補強部材５の他方の面から熱を加え、図５（ｃ）に示すように補強部材５の右側に深溶け込み溶接部８を形成し、最後に、その溶接機を作業機構成部材４側に置き換えて作業機構成部材４の他方の面から熱を加え、図５（ｄ）に示すようにこの深溶け込み溶接部８の近傍に深溶け込み溶接部９を形成する。   The procedure for forming the deep penetration welds 8 and 9 will be described with reference to FIG. 5. First, heat is applied from the other surface of the reinforcing member 5 by this welding machine, as shown in FIG. 5 (a). A deep penetration weld 8 is formed on the left side of the reinforcing member 5. Next, the welding machine is replaced with the work machine component 4 side, and heat is applied from the other surface of the work machine component 4, so that the deep penetration weld is in the vicinity of the deep penetration weld 8 as shown in FIG. 9 is formed. Next, the welding machine is replaced with the reinforcing member 5 side, and heat is applied from the other surface of the reinforcing member 5 to form a deep penetration weld 8 on the right side of the reinforcing member 5 as shown in FIG. Then, the welding machine is replaced with the work machine component 4 side, and heat is applied from the other surface of the work machine component 4, and a deep penetration weld is formed in the vicinity of the deep penetration weld 8 as shown in FIG. 9 is formed.

こうした方法により深溶け込み溶接部８，９を形成するようにすれば、標準出力の溶接機を１台配備し、これを交互に使用して補強部材５の他方の面と作業機構成部材４の他方の面とから交互に熱を加えることにより、標準出力の１台の溶接機により両部材４，５の他方の面からそれぞれ熱を加えて深溶け込み溶接部８，９を形成することができる。そのため、本発明に係る建設機械の作業機構成部材と補強部材の接合方法を実施する際、設備投資を安価に済ませることができる。   If the deep penetration welds 8 and 9 are formed by such a method, one standard output welding machine is provided, and the other surface of the reinforcing member 5 and the working machine component 4 are used alternately. By alternately applying heat from the other surface, it is possible to form deep penetration welds 8 and 9 by applying heat from the other surfaces of both members 4 and 5 with one standard output welding machine. . Therefore, when implementing the joining method of the working machine component of the construction machine and the reinforcing member according to the present invention, the capital investment can be made at a low cost.

本発明に係る建設機械の作業機構成部材と補強部材の接合方法において、補強部材５の他方の面及び作業機構成部材４の他方の面からそれぞれ熱を加えて深溶け込み溶接部８，９を形成する場合に、第２番目の方法として、補強部材５の他方の面と作業機構成部材４の他方の面とから同時に熱を加えて深溶け込み溶接部８，９を形成する方法がある。図６は、こうした方法により深溶け込み溶接部８，９を形成する手順を示したものである。この方法を実施するに際しては、深溶け込み溶接部８，９を形成することが可能な標準出力の溶接機（図示せず。）を２台配備する。   In the method for joining the working machine component and the reinforcing member of the construction machine according to the present invention, heat is applied from the other surface of the reinforcing member 5 and the other surface of the working machine component 4 to respectively form the deep penetration welds 8 and 9. In the case of forming, there is a second method in which deep penetration welds 8 and 9 are formed by simultaneously applying heat from the other surface of the reinforcing member 5 and the other surface of the work implement component 4. FIG. 6 shows a procedure for forming the deep penetration welds 8 and 9 by such a method. In carrying out this method, two standard output welding machines (not shown) capable of forming deep penetration welds 8 and 9 are provided.

図６に基づき、前記の深溶け込み溶接部８，９を形成する手順を説明すると、まず、これら２台の溶接機により、補強部材５の他方の面と作業機構成部材４の他方の面とから同時に熱を加えて、図６（ａ）に示すように補強部材５の左側１２に深溶け込み溶接部８，９を一度に形成する。次いで、これら２台の溶接機を右方に移動して補強部材５の他方の面と作業機構成部材４の他方の面とから同時に熱を加え、図６（ｂ）に示すように補強部材５の右側１４に深溶け込み溶接部８，９を一度に形成する。最後に、２台の溶接機を補強部材５の中間位置に移動して補強部材５の他方の面と作業機構成部材４の他方の面とから同時に熱を加え、図６（ｃ）に示すように補強部材５の中間部１３に深溶け込み溶接部８，９を一度に形成する。   The procedure for forming the deep penetration welds 8 and 9 will be described based on FIG. 6. First, the other surface of the reinforcing member 5 and the other surface of the work implement component 4 are formed by these two welding machines. Then, heat is applied at the same time, and as shown in FIG. 6A, deep penetration welds 8 and 9 are formed on the left side 12 of the reinforcing member 5 at a time. Next, these two welding machines are moved to the right, and heat is applied simultaneously from the other surface of the reinforcing member 5 and the other surface of the work implement component 4, and the reinforcing member as shown in FIG. 6 (b). 5 are formed at the same time on the right side 14 of 5. Finally, the two welding machines are moved to an intermediate position of the reinforcing member 5 and heat is simultaneously applied from the other surface of the reinforcing member 5 and the other surface of the work implement component 4, as shown in FIG. In this manner, deep penetration welds 8 and 9 are formed at a time in the intermediate portion 13 of the reinforcing member 5.

こうした方法により深溶け込み溶接部８，９を形成するようにすれば、補強部材５の他方の面と作業機構成部材４の他方の面とから同時に熱を加えて深溶け込み溶接部８，９を形成することができるので、深溶け込み溶接部８，９の形成時における作業機構成部材４と補強部材５とのヒートバランスが良くなる。そのため、この作業機構成部材と補強部材の接合方法を実施する過程において作業機構成部材４と補強部材５の加熱、冷却時間が均一となり、溶接後に両部材４，５が図２のように凹状に変形するのをより確実に抑制することができる。   If the deep penetration welds 8 and 9 are formed by such a method, heat is simultaneously applied from the other surface of the reinforcing member 5 and the other surface of the work implement component 4 to form the deep penetration welds 8 and 9. Since it can form, the heat balance of the working machine component 4 and the reinforcement member 5 at the time of formation of the deep penetration welds 8 and 9 is improved. Therefore, the heating and cooling times of the work implement constituent member 4 and the reinforcing member 5 become uniform during the process of joining the work implement constituent member and the reinforcing member, and the two members 4 and 5 are concave as shown in FIG. Can be more reliably suppressed.

深溶け込み溶接部８，９を形成する場合、ここでは、標準出力の溶接機を２台配備する例を示したが、１台の溶接機を分岐して２個所で溶接できるようにしたものを配備してもよい。その場合、溶接機は、標準出力の溶接機の約２倍の出力を有する大出力のものを配備する必要があり、溶接機の設備投資がその分増加する。この図６の溶接法は、初期の目的を達成する上では理想的であるが、設備投資が図５の溶接法よりも増加する。   In the case of forming deep penetration welds 8 and 9, here, an example in which two standard output welding machines are provided has been shown, but one welding machine can be branched and welded at two locations. May be deployed. In that case, it is necessary to deploy a welding machine having a large output having about twice the output of the standard output welding machine, and the capital investment of the welding machine increases accordingly. The welding method of FIG. 6 is ideal in achieving the initial purpose, but the capital investment is increased as compared with the welding method of FIG.

補強部材５は、油圧ショベルのブーム１、アーム２及びバケット３に接合することができるほか、必要に応じて、油圧ショベルのアタッチメントにも接合することができる。また、必要に応じて、油圧ショベル以外の建設機械の作業機構成部材にも接合することができる。図７において、符号１５は、本発明による方法によりアーム２に接合した補強部材を示したものである。また、図８における符号１６及び図９における符号１７は、本発明による方法によりバケット３に接合した補強部材を示したものである。   The reinforcing member 5 can be joined to the boom 1, the arm 2, and the bucket 3 of the excavator, and can also be joined to the attachment of the excavator as necessary. Moreover, it can join also to the working machine structural member of construction machines other than a hydraulic shovel as needed. In FIG. 7, reference numeral 15 denotes a reinforcing member joined to the arm 2 by the method according to the present invention. Moreover, the code | symbol 16 in FIG. 8 and the code | symbol 17 in FIG. 9 show the reinforcement member joined to the bucket 3 by the method by this invention.

本発明に係る建設機械の作業機構成部材と補強部材の接合方法に関するシンプルな例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the simple example regarding the joining method of the working machine structural member and reinforcement member of the construction machine which concern on this invention. 図１の作業機構成部材と補強部材の接合方法に関する作用効果を説明するための第１の比較例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the 1st comparative example for demonstrating the effect regarding the joining method of the working machine structural member of FIG. 1, and a reinforcement member. 図１の作業機構成部材と補強部材の接合方法に関する作用効果を説明するための第２の比較例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the 2nd comparative example for demonstrating the effect regarding the joining method of the working machine structural member of FIG. 1, and a reinforcement member. 本発明に係る建設機械の作業機構成部材と補強部材の接合方法において深溶け込み溶接部を高エネルギー密度溶接方法により形成した場合の例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the example at the time of forming a deep penetration welding part by the high energy density welding method in the joining method of the working machine structural member and reinforcement member of the construction machine which concern on this invention. 本発明に係る建設機械の作業機構成部材と補強部材の接合方法において深溶け込み溶接部を形成する場合のプロセスを示す縦断面図である。It is a longitudinal cross-sectional view which shows the process in the case of forming a deep penetration weld part in the joining method of the working machine structural member of a construction machine which concerns on this invention, and a reinforcement member. 本発明に係る建設機械の作業機構成部材と補強部材の接合方法において深溶け込み溶接部を形成する場合の他のプロセスを示す縦断面図である。It is a longitudinal cross-sectional view which shows the other process in the case of forming a deep penetration welding part in the joining method of the working machine structural member of a construction machine which concerns on this invention, and a reinforcement member. 本発明に係る建設機械の作業機構成部材と補強部材の接合方法を油圧ショベルのアームに具体化した例を示す斜視図である。It is a perspective view which shows the example which actualized the joining method of the working machine structural member and reinforcement member of the construction machine which concerns on this invention to the arm of the hydraulic shovel. 本発明に係る建設機械の作業機構成部材と補強部材の接合方法を油圧ショベルのバケットに具体化した例を示す斜視図である。It is a perspective view which shows the example which actualized the joining method of the working machine structural member and reinforcement member of the construction machine which concerns on this invention to the bucket of the hydraulic shovel. 図８の油圧ショベルのバケットの底面図である。It is a bottom view of the bucket of the hydraulic excavator of FIG. 従来の一般的な油圧ショベルの全体像を示す斜視図である。It is a perspective view which shows the general image of the conventional common hydraulic shovel. 従来の一般的な建設機械の作業機構成部材と補強部材の接合方法を示す平面図である。It is a top view which shows the joining method of the working machine structural member and reinforcement member of the conventional general construction machine. 従来の一般的な建設機械の作業機構成部材と補強部材の接合方法を示す縦断面図である。It is a longitudinal cross-sectional view which shows the joining method of the working machine structural member and reinforcement member of the conventional general construction machine. 図１２の建設機械の作業機構成部材と補強部材の接合方法の問題点を説明するための縦断面図である。It is a longitudinal cross-sectional view for demonstrating the problem of the joining method of the working machine structural member and reinforcement member of the construction machine of FIG.

符号の説明Explanation of symbols

１ ブーム
２ アーム
３ バケット
４ 作業機構成部材
４ａ （作業機構成部材４の）一方の面
５ 補強部材
５ａ （補強部材５の）一方の面
５ｂ （補強部材５の）周縁部
６ （隅肉溶接による）ビード
７ （応力集中に起因する疲労破壊による）亀裂
８ 深溶け込み溶接部
９ 深溶け込み溶接部
１５ （本発明による方法によりアーム２に接合した）補強部材
１６，１７ （本発明による方法によりバケット３に接合した）補強部材 DESCRIPTION OF SYMBOLS 1 Boom 2 Arm 3 Bucket 4 Work implement component 4a (One of the work implement components 4) One surface 5 Reinforcement member 5a (One of the reinforcement members 5) One surface 5b (Reinforcement member 5) Perimeter 6 7) Cracks (due to fatigue failure due to stress concentration) 8 Deep penetration welds 9 Deep penetration welds 15 (joined to arm 2 by the method of the present invention) Reinforcing members 16, 17 (buckets by the method of the present invention) Reinforcing member joined to 3)

Claims (4)

建設機械の作業機構成部材の一方の面に補強部材の一方の面を接合する建設機械の作業機構成部材と補強部材の接合方法において、作業機構成部材の一方の面と補強部材の周縁部とを隅肉溶接するほか、補強部材の他方の面から熱を加えて作業機構成部材まで溶け込ませた深溶け込み溶接部を形成するとともに、作業機構成部材の他方の面から熱を加えて補強部材まで溶け込ませた深溶け込み溶接部を形成して、作業機構成部材に補強部材を接合するようにしたことを特徴とする建設機械の作業機構成部材と補強部材の接合方法。   In a method of joining a work machine component and a reinforcement member of a construction machine, which joins one surface of the reinforcement member to one surface of the work machine component of the construction machine, the one surface of the work machine component and the peripheral portion of the reinforcement member In addition to forming fillet welds, heat is applied from the other surface of the reinforcing member to form a deep penetration weld that is melted to the work implement component, and heat is applied from the other surface of the work implement component to reinforce. A method of joining a work implement component and a reinforcement member of a construction machine, wherein a deep penetration weld portion is formed which is melted to the member and the reinforcement member is joined to the work implement component. 請求項１に記載の建設機械の作業機構成部材の接合方法において、深溶け込み溶接部を形成する場合に高エネルギー密度溶接方法により形成するようにしたことを特徴とする建設機械の作業機構成部材と補強部材の接合方法。   2. The work machine component for construction equipment according to claim 1, wherein the deep work weld is formed by a high energy density welding method when the deep penetration weld is formed. And joining method of reinforcing member. 請求項１又は請求項２に記載の建設機械の作業機構成部材の接合方法において、補強部材の他方の面及び作業機構成部材の他方の面からそれぞれ熱を加えて深溶け込み溶接部を形成する場合に、補強部材の他方の面と作業機構成部材の他方の面とから交互に熱を加えて深溶け込み溶接部を形成するようにしたことを特徴とする建設機械の作業機構成部材と補強部材の接合方法。   In the joining method of the working machine component of the construction machine according to claim 1 or 2, the deep penetration weld is formed by applying heat from the other surface of the reinforcing member and the other surface of the working machine component. In this case, the work machine component and reinforcement of the construction machine are characterized in that a deep penetration weld is formed by alternately applying heat from the other surface of the reinforcement member and the other surface of the work machine component. Member joining method. 請求項１又は請求項２に記載の建設機械の作業機構成部材の接合方法において、補強部材の他方の面及び作業機構成部材の他方の面からそれぞれ熱を加えて深溶け込み溶接部を形成する場合に、補強部材の他方の面と作業機構成部材の他方の面とから同時に熱を加えて深溶け込み溶接部を形成するようにしたことを特徴とする建設機械の作業機構成部材と補強部材の接合方法。   In the joining method of the working machine component of the construction machine according to claim 1 or 2, the deep penetration weld is formed by applying heat from the other surface of the reinforcing member and the other surface of the working machine component. In this case, the work machine component and the reinforcement member of the construction machine are characterized in that a deep penetration weld is formed by simultaneously applying heat from the other surface of the reinforcement member and the other surface of the work machine component. Joining method.
JP2005337299A 2005-11-22 2005-11-22 Method for welding working machine component member and reinforcing member in construction equipment Pending JP2007136532A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012206156A (en) * 2011-03-30 2012-10-25 Tadano Ltd Boom, and method for welding the same
US10040495B2 (en) 2015-12-08 2018-08-07 Caterpillar Inc. Laser brazing of annular metal seal member on track link
WO2018147283A1 (en) * 2017-02-07 2018-08-16 古河電気工業株式会社 Vapor chamber

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60257967A (en) * 1984-06-06 1985-12-19 Hitachi Ltd Joining method of plural metallic plates
JP2003268804A (en) * 2002-03-15 2003-09-25 Hitachi Constr Mach Co Ltd Reinforcing device for component of construction machinery and its reinforcing method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60257967A (en) * 1984-06-06 1985-12-19 Hitachi Ltd Joining method of plural metallic plates
JP2003268804A (en) * 2002-03-15 2003-09-25 Hitachi Constr Mach Co Ltd Reinforcing device for component of construction machinery and its reinforcing method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012206156A (en) * 2011-03-30 2012-10-25 Tadano Ltd Boom, and method for welding the same
US10040495B2 (en) 2015-12-08 2018-08-07 Caterpillar Inc. Laser brazing of annular metal seal member on track link
WO2018147283A1 (en) * 2017-02-07 2018-08-16 古河電気工業株式会社 Vapor chamber
JPWO2018147283A1 (en) * 2017-02-07 2019-07-18 古河電気工業株式会社 Vapor chamber

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