JP2010272712A - Method of manufacturing shunt resistor - Google Patents

Method of manufacturing shunt resistor Download PDF

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JP2010272712A
JP2010272712A JP2009123743A JP2009123743A JP2010272712A JP 2010272712 A JP2010272712 A JP 2010272712A JP 2009123743 A JP2009123743 A JP 2009123743A JP 2009123743 A JP2009123743 A JP 2009123743A JP 2010272712 A JP2010272712 A JP 2010272712A
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electrode
width
alloy plate
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resistance alloy
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JP5374732B2 (en
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Tadahiko Yoshioka
忠彦 吉岡
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Koa Corp
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Koa Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a shunt resistor by which an electrode material made of a metal plate is stably joined with both ends of one surface of a resistance alloy plate in parallel and at a necessary constant distance, and variance in resistor resistance value is reducible. <P>SOLUTION: The resistance alloy plate 17 of predetermined thickness and width and the electrode material 11 made of the metal plate of predetermined thickness and width are prepared, a pair of electrode parts 13a, 13b of predetermined thickness and width and coupling parts 14a, 14b coupling the electrode parts to each other are formed at both ends of the electrode material, and the coupling parts are narrower than the width of the electrode parts and also arranged at positions apart from surfaces of the electrode parts along their thicknesses. Both the ends of the resistance alloy plate are joined with the surfaces of the pair of electrode parts, and the coupling parts are cut and removed. A through hole O may be formed in the electrode material 11, and the pair of the electrode parts 13a, 13b and the pair of coupling parts 14a, 14b coupling the electrode parts to each other may be formed on both width-direction outer sides of the through hole O. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、電流検出用のシャント抵抗器に係り、特に抵抗合金板材一面の両端部に金属板材からなる電極材を接合したシャント抵抗器の製造方法に関する。   The present invention relates to a shunt resistor for current detection, and more particularly to a method of manufacturing a shunt resistor in which electrode materials made of a metal plate material are joined to both ends of one surface of a resistance alloy plate material.

従来から、前記構造のシャント抵抗器が特に高電流の電流検出用途に広く用いられている。係るシャント抵抗器では、抵抗合金板材の一面の両端部に金属板材からなる電極材を接合するのであるが、両電極材間の間隔が平行でない、或いは間隔にバラツキがあると、所要の抵抗器抵抗値精度が得られないという問題がある。   Conventionally, shunt resistors having the above-described structure have been widely used particularly for high-current detection applications. In such a shunt resistor, an electrode material made of a metal plate material is joined to both end portions of one surface of a resistance alloy plate material. If the distance between the electrode materials is not parallel or the distance varies, the required resistor is used. There is a problem that the resistance value accuracy cannot be obtained.

特開２００６−８０１４６号公報JP 2006-80146 A

本発明は、上述の事情に基づいてなされたもので、抵抗合金板材の一面の両端部に金属板材からなる電極材を、平行且つ所要の一定距離を維持して安定に接合でき、抵抗器抵抗値のバラツキを低減できるシャント抵抗器の製造方法を提供することを目的とする。   The present invention has been made based on the above-mentioned circumstances, and it is possible to stably join an electrode material made of a metal plate material to both ends of one surface of a resistance alloy plate material while maintaining a predetermined constant distance in parallel. An object of the present invention is to provide a method of manufacturing a shunt resistor that can reduce variation in value.

本発明のシャント抵抗器の製造方法は、所定の厚みと幅を有する抵抗合金板材と、所定の厚みと幅を有する金属板材からなる電極材を準備し、該電極材の両端に所定の厚みと幅を有する一対の電極部と、該電極部同士を連結する連結部を形成し、該連結部は前記電極部の幅よりも狭く、且つ、前記電極部の表面からその厚み方向に離間した位置に配置され、前記抵抗合金板材の両端部を、前記一対の電極部の表面に接合し、前記連結部を切断して除去する、ことを特徴とする。   The manufacturing method of the shunt resistor of the present invention provides a resistance alloy plate material having a predetermined thickness and width and an electrode material made of a metal plate material having a predetermined thickness and width, and has a predetermined thickness at both ends of the electrode material. A pair of electrode portions having a width and a connecting portion for connecting the electrode portions to each other, the connecting portion being narrower than the width of the electrode portion and spaced from the surface of the electrode portion in the thickness direction The both ends of the resistance alloy plate material are joined to the surfaces of the pair of electrode portions, and the connecting portions are cut and removed.

また、本発明のシャント抵抗器の製造方法は、所定の厚みと幅を有する抵抗合金板材と、所定の厚みと幅を有する金属板材からなる電極材を準備し、該電極材に貫通孔を形成し、一対の電極部とこの電極部同士を連結する一対の連結部を前記貫通孔の幅方向の両外側に形成し、前記貫通孔の幅は前記抵抗合金板材の幅よりも大きく、前記抵抗合金板材の両端部と前記一対の電極部とを接合し、前記連結部を切断して除去する、ことを特徴とする。   In addition, the manufacturing method of the shunt resistor of the present invention prepares an electrode material made of a resistance alloy plate material having a predetermined thickness and width and a metal plate material having a predetermined thickness and width, and forms a through hole in the electrode material. A pair of electrode portions and a pair of connecting portions that connect the electrode portions are formed on both outer sides in the width direction of the through hole, and the width of the through hole is larger than the width of the resistance alloy plate material, Both ends of the alloy plate and the pair of electrode portions are joined, and the connecting portion is cut and removed.

本発明によれば、両電極部間を連結部により連結した状態で、抵抗合金板材の両端部を両電極部の表面に接合するので、接合時に両電極間の距離がずれることがなく、電極パーツの高い平行度および間隔の寸法精度を維持した状態でシャント抵抗器を製造できる。このため、両電極の配置を規定するための特別な治具を用いなくても、抵抗合金板材の幅および厚さを精度よく加工しておくことで、抵抗器の抵抗値は抵抗体の電極間長さと幅と厚さで決まってくるので、高精度の抵抗値が得られる。   According to the present invention, since both ends of the resistance alloy plate material are joined to the surfaces of the two electrode parts in a state where the two electrode parts are connected by the connecting part, the distance between the two electrodes is not shifted at the time of joining. A shunt resistor can be manufactured in a state in which high parallelism of parts and dimensional accuracy of the interval are maintained. For this reason, without using a special jig for defining the arrangement of both electrodes, the resistance value of the resistor can be obtained by accurately processing the width and thickness of the resistance alloy sheet. Since the length, width and thickness are determined, a highly accurate resistance value can be obtained.

特に、連結部の裏面が一対の電極部の裏面と同一面をなし、連結部は電極部の幅よりも狭く、且つ、電極部の表面からその厚み方向に離間した位置に配置されることで、また、電極材に貫通孔を形成し、一対の電極部とこの電極部同士を連結する一対の連結部を貫通孔の幅方向の両外側に形成することで、接合時のストレスに対し、両電極部間の研削加工時の高い平行度および間隔の寸法精度を維持した状態でシャント抵抗器を製造できる。また、連結部は電極部の幅よりも狭いので、切断が容易であり、接合部にかけるストレスを抑えつつ製造することができる。   In particular, the back surface of the connecting portion is flush with the back surface of the pair of electrode portions, the connecting portion is narrower than the width of the electrode portion, and is disposed at a position spaced from the surface of the electrode portion in the thickness direction. In addition, by forming a through hole in the electrode material, and forming a pair of connecting portions that connect the pair of electrode portions and the electrode portions on both outer sides in the width direction of the through hole, against stress at the time of joining, The shunt resistor can be manufactured in a state in which high parallelism and the dimensional accuracy of the interval at the time of grinding between both electrode portions are maintained. Further, since the connecting portion is narrower than the width of the electrode portion, it is easy to cut and can be manufactured while suppressing the stress applied to the joint portion.

（ａ）乃至（ｆ）は本発明の第１実施形態の製造工程を示す斜視図である。(A) thru | or (f) is a perspective view which shows the manufacturing process of 1st Embodiment of this invention. （ａ）は従来技術の課題を示す平面図であり、（ｂ）は特許文献１の課題を示す断面図である。(A) is a top view which shows the subject of a prior art, (b) is sectional drawing which shows the subject of patent document 1. FIG. 本発明の第２実施形態の貫通孔形成段階を示す、（ａ）は平面図であり、（ｂ）は（ａ）のＢＢ線に沿った断面図であり、（ｃ）は（ａ）のＣＣ線に沿った断面図であり、（ｄ）は表面側の斜視図である。The through-hole formation stage of 2nd Embodiment of this invention is shown, (a) is a top view, (b) is sectional drawing along BB line of (a), (c) is (a). It is sectional drawing along CC line, (d) is a perspective view of the surface side. 本発明の第２実施形態の抵抗合金板材接合段階を示す、図３Ａに対応した図であり、（ｅ）は裏面側の斜視図である。It is a figure corresponding to Drawing 3A showing the resistance alloy sheet material joining step of a 2nd embodiment of the present invention, and (e) is a perspective view of the back side. 本発明の第２実施形態の連結部切断除去後を示す、図３Ｂに対応した図である。It is a figure corresponding to Drawing 3B which shows after connecting part cutting removal of a 2nd embodiment of the present invention.

以下、本発明の実施形態について、図１と図３Ａ乃至図３Ｃを参照して説明する。なお、各図中、同一または相当する部材または要素には、同一の符号を付して説明する。   Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 3A to 3C. In addition, in each figure, the same code | symbol is attached | subjected and demonstrated to the same or equivalent member or element.

まず、第１実施形態について説明する。所定の厚みと幅を有する抵抗合金板材と、所定の厚みと幅を有する金属板材からなる電極材を準備する。抵抗合金板材には、Ｃｕ−Ｍｎ系合金、Ｎｉ−Ｃｒ系合金、Ｃｕ−Ｎｉ合金などの板材が用いられる。電極材には、Ｃｕの金属板材が好適である。   First, the first embodiment will be described. An electrode material composed of a resistance alloy plate having a predetermined thickness and width and a metal plate having a predetermined thickness and width is prepared. A plate material such as a Cu—Mn alloy, a Ni—Cr alloy, or a Cu—Ni alloy is used for the resistance alloy plate. As the electrode material, a Cu metal plate material is suitable.

図１（ａ）に示すように、電極材１１には、両端にボルト締め用の貫通孔１２ａ，１２ｂを備える。貫通孔は形成しなくてもよいし、貫通孔内にボルトによる締め付け固定用のネジ溝を形成したり、電極材１１にボルトを突出形成させたり等、固定方法に応じて種々変更可能である。電極材１１の概略寸法は一例として、長さ８０ｍｍ程度、幅２０ｍｍ程度、厚さ３ｍｍ程度である。   As shown to Fig.1 (a), the electrode material 11 is equipped with the through-holes 12a and 12b for bolt fastening at both ends. The through hole does not need to be formed, and various modifications can be made depending on the fixing method, such as forming a screw groove for tightening and fixing with a bolt in the through hole, or projecting and forming a bolt on the electrode material 11. . As an example, the approximate dimensions of the electrode material 11 are about 80 mm in length, about 20 mm in width, and about 3 mm in thickness.

次に、図１（ｂ）に示すように、電極材１１の中間部分に、プレス加工や切削加工などの方法で、連結部１４ａ，１４ｂと検出用端子１５ａ，１５ｂとを形成する。すなわち、電極材１１の両端に所定の厚みと幅を有する一対の電極部１３ａ，１３ｂと、該電極部同士を連結する連結部１４ａ，１４ｂを形成し、さらに電極部同士の対向面に検出用端子１５ａ，１５ｂを形成する。   Next, as shown in FIG. 1B, the connecting portions 14a and 14b and the detection terminals 15a and 15b are formed in the intermediate portion of the electrode material 11 by a method such as pressing or cutting. That is, a pair of electrode portions 13a and 13b having a predetermined thickness and width are formed at both ends of the electrode material 11, and connecting portions 14a and 14b for connecting the electrode portions to each other, and further, detection surfaces are provided on the opposing surfaces of the electrode portions. Terminals 15a and 15b are formed.

連結部１４ａ，１４ｂと検出用端子１５ａ，１５ｂは、電極材１１の中間部を表面から厚み方向に沿って研削し、表面からその厚み方向に一定距離研削して凹面を形成した後、プレスにより連結部１４ａ，１４ｂと検出用端子１５ａ，１５ｂを残してその他の部分を打ち抜き除去する。これにより、電極部１３ａ，１３ｂの幅よりも狭く、且つ、電極部１３ａ，１３ｂの表面からその厚み方向に離間した位置に連結部１４ａ，１４ｂが形成される。そして、連結部１４ａ，１４ｂの裏面は一対の電極部１３ａ，１３ｂのそれぞれの裏面と同一面をなしている。なお、連結部１４ａ，１４ｂはプレス加工で形成してもよい。   The connecting portions 14a and 14b and the detection terminals 15a and 15b are formed by grinding an intermediate portion of the electrode material 11 along the thickness direction from the surface, and grinding a fixed distance from the surface in the thickness direction to form a concave surface. The other portions are punched and removed, leaving the connecting portions 14a and 14b and the detection terminals 15a and 15b. As a result, the connecting portions 14a and 14b are formed at positions that are narrower than the widths of the electrode portions 13a and 13b and are spaced apart from the surfaces of the electrode portions 13a and 13b in the thickness direction. The back surfaces of the connecting portions 14a and 14b are flush with the back surfaces of the pair of electrode portions 13a and 13b. In addition, you may form the connection parts 14a and 14b by press work.

連結部１４ａ，１４ｂは、電極１３ａ，１３ｂの幅内においてできるだけ離間することが好ましい。このため本実施例では、連結部１４ａ，１４ｂは電極１３ａ，１３ｂの幅方向における側面と同一面を構成している。また、上述のとおり、連結部１４ａ，１４ｂの裏面は、電極部１３ａ，１３ｂのそれぞれの裏面と同一面をなしている。このように構成することで、後述する抵抗合金板材１７と電極部１３ａ，１３ｂとの接合工程において、例えば加圧された場合でも、電極部１３ａ，１３ｂの間隔のずれや歪みを好適に防止することができる。また、電極の形状は抵抗器の特性に影響を与えることがあるが、上記の如く電流の主な経路を避けた位置に連結部１４ａ，１４ｂを構成することにより、特に後述する連結部の切断工程後の電極形状が、抵抗器の特性へ影響を及ぼすことを防止できる。   The connecting portions 14a and 14b are preferably separated as much as possible within the width of the electrodes 13a and 13b. For this reason, in this embodiment, the connecting portions 14a and 14b constitute the same surface as the side surfaces of the electrodes 13a and 13b in the width direction. Further, as described above, the back surfaces of the connecting portions 14a and 14b are flush with the back surfaces of the electrode portions 13a and 13b. By configuring in this way, in the joining process of the resistance alloy plate 17 and the electrode portions 13a and 13b, which will be described later, for example, even when pressure is applied, the gap and distortion of the electrode portions 13a and 13b are suitably prevented. be able to. In addition, the shape of the electrode may affect the characteristics of the resistor. By connecting the connecting portions 14a and 14b at positions where the main current path is avoided as described above, the connecting portion is cut in particular, which will be described later. It is possible to prevent the electrode shape after the process from affecting the characteristics of the resistor.

ここで、両電極部１３ａ，１３ｂの対向面間の間隔は、両電極部１３ａ，１３ｂの表面に跨って配置される抵抗合金板材１７の実効的な抵抗体として動作する長さを決めるものであり、この間隔を切削等の研削加工により形成するので、精度が高く且つ均一な長さが得られる。   Here, the distance between the opposing surfaces of both electrode portions 13a and 13b determines the length that operates as an effective resistor of the resistance alloy plate 17 disposed across the surfaces of both electrode portions 13a and 13b. In addition, since this interval is formed by grinding such as cutting, a highly accurate and uniform length can be obtained.

次に、図１（ｃ）に示すように、抵抗合金板材１７の位置決め用の凹み１６ａ，１６ｂを研削加工等により形成する。凹み１６ａ，１６ｂの底面は同一高さの面で且つその側面は電極材１１の長さ方向に対して垂直方向に形成する。なお、本実施例では連結部１４ａ，１４ｂの工程と、凹み１６ａ，１６ｂの工程を図１（ｂ）と図１（ｃ）に分けて説明したが、図１（ｂ）と図１（ｃ）は逆の順序または同一の工程にしてもよい。また、連結部１４ａ，１４ｂと、凹み１６ａ，１６ｂは、１回または複数回のプレスにより形成したり、切削加工により形成したりすることも可能である。   Next, as shown in FIG. 1C, the positioning recesses 16a and 16b of the resistance alloy sheet 17 are formed by grinding or the like. The bottom surfaces of the recesses 16 a and 16 b are surfaces having the same height, and the side surfaces thereof are formed in a direction perpendicular to the length direction of the electrode material 11. In addition, although the process of the connection parts 14a and 14b and the process of the dents 16a and 16b were divided into FIG. 1B and FIG. 1C in the present embodiment, FIG. 1B and FIG. ) May be in reverse order or in the same process. The connecting portions 14a and 14b and the recesses 16a and 16b can be formed by one or more presses or can be formed by cutting.

そして、図１（ｄ）に示すように、凹み１６ａ，１６ｂに嵌合するように抵抗合金板材１７を位置合わせして載置し、抵抗合金板材１７の両端を電極部１３ａ，１３ｂの表面に跨るように接合する。抵抗合金板材１７と電極部１３ａ，１３ｂとの接合には、電子ビーム溶接、パルス通電接合、熱圧着、冷間圧接、抵抗溶接、ハンダなどによるろう接など、種々の方法を適用可能であるが、接合状態や抵抗値等の特性の安定性から、パルス通電接合、熱圧着などを利用した拡散接合を用いることが好ましい。 And as shown in FIG.1 (d), the resistance alloy board | plate material 17 is aligned and mounted so that it may fit in the dents 16a and 16b, and the both ends of the resistance alloy board | plate material 17 are on the surface of electrode part 13a, 13b. Join to straddle. Various methods such as electron beam welding, pulse current welding, thermocompression bonding, cold welding, resistance welding, soldering by soldering, etc. can be applied to the joining of the resistance alloy plate 17 and the electrode portions 13a and 13b. From the viewpoint of stability of characteristics such as the bonding state and resistance value, it is preferable to use diffusion bonding using pulse current bonding or thermocompression bonding.

図１（ｅ）はこれを裏返した図である。電極材１１の両電極部１３ａ，１３ｂを裏面側で連結する連結部１４ａ，１４ｂは、電極部１３ａ，１３ｂの表面からその厚み方向に離間した位置に配置され、この連結部１４ａ，１４ｂを切断して除去する。切断には、グラインダや、ニッパー等を使う。これにより、電極部１３ａ，１３ｂは電気的にも機械的にも分離され、電極材１１は独立した電極１１ａ，１１ｂとなる。   FIG.1 (e) is the figure which reversed this. The connecting portions 14a and 14b for connecting both electrode portions 13a and 13b of the electrode material 11 on the back side are arranged at positions spaced from the surface of the electrode portions 13a and 13b in the thickness direction, and the connecting portions 14a and 14b are cut. And remove. A grinder or nipper is used for cutting. Thereby, electrode part 13a, 13b is isolate | separated electrically and mechanically, and the electrode material 11 turns into independent electrode 11a, 11b.

このシャント抵抗器では、上述のように、両電極部１３ａ，１３ｂ間を連結部により連結した状態で、抵抗合金板材１７の両端部を両電極部１３ａ，１３ｂの表面に圧接等により接合する。このため、接合時に電極間の距離がずれることがなく、プレス加工や、研削加工等の金属加工技術を用いて高い平行度および間隔の寸法精度を維持した状態でシャント抵抗器を製造できる。従って、抵抗合金板材１７の幅および厚さを精度よく加工しておくことで、抵抗器の抵抗値は抵抗体の電極間長さと幅と厚さで決まってくるので、高精度の抵抗値が得られる。これにより、例えば、目標抵抗値０．１ｍΩに対して、抵抗値調整をすることなく、特性のばらつきが殆ど無いシャント抵抗器を安定して生産することが可能となる。   In this shunt resistor, as described above, both ends of the resistance alloy plate 17 are joined to the surfaces of the electrodes 13a and 13b by pressure welding or the like in a state where the electrodes 13a and 13b are connected by the connecting portion. For this reason, the distance between electrodes does not shift at the time of joining, and a shunt resistor can be manufactured in a state where high parallelism and dimensional accuracy of the interval are maintained by using metal working techniques such as press working and grinding. Accordingly, by processing the width and thickness of the resistance alloy plate 17 with high accuracy, the resistance value of the resistor is determined by the inter-electrode length, width, and thickness of the resistor. can get. Accordingly, for example, it is possible to stably produce a shunt resistor having almost no variation in characteristics without adjusting the resistance value with respect to the target resistance value of 0.1 mΩ.

なお、電極１１ａ，１１ｂをそれぞれ独立に抵抗合金板材１７の両端に接合する場合には、図２（ａ）に示すように、接合時のストレスにより接合位置にバラツキが生じ、シャント抵抗器の抵抗値精度が悪くなるという問題があるが、本発明の製造方法によれば、プレス加工や研削加工等の金属加工技術を用いて形成した連結部により係る問題が解決される。   When the electrodes 11a and 11b are joined to both ends of the resistance alloy plate 17 independently, as shown in FIG. 2A, the joining position varies due to stress during joining, and the resistance of the shunt resistor is reduced. Although there is a problem that the value accuracy is deteriorated, according to the manufacturing method of the present invention, the problem is solved by the connecting portion formed by using a metal processing technique such as press working or grinding.

また、特開２００６−８０１４６号公報では、電極１１ａ，１１ｂを１枚の電極材から形成する点で本発明と共通するが、１枚の電極材をプレス加工により折り曲げて形成することが開示されている（００１７欄）。折り曲げ加工の場合には、図２（ｂ）に示すように、必然的に電極１１ａ，１１ｂの対向部分で角部付近（図中Ｒで示す）の形状が不安定となり、抵抗合金板材１７と電極１１ａ，１１ｂとの接合面における固着が不安定となり、その結果、抵抗体の電極間長さＬが不安定となり、抵抗器抵抗値のバラツキの原因となると考えられる。また、電極同士が反って固定されてしまう等、形状が不安定になりやすい。   Japanese Patent Application Laid-Open No. 2006-80146 discloses that the electrodes 11a and 11b are formed from a single electrode material in common with the present invention, but it is disclosed that a single electrode material is formed by bending by pressing. (Column 0017). In the case of bending, as shown in FIG. 2 (b), the shape near the corners (indicated by R in the figure) is inevitably unstable at the opposing portions of the electrodes 11a and 11b, and the resistance alloy plate 17 and It is considered that the bonding between the electrodes 11a and 11b becomes unstable, and as a result, the inter-electrode length L of the resistor becomes unstable, causing variations in the resistance value of the resistor. In addition, the shape tends to be unstable, such as the electrodes being warped and fixed.

本発明の製造方法では、抵抗合金板材１７と電極１１ａ，１１ｂとの接合時に、電極１１ａ，１１ｂが折り曲げ加工された面と異なって平坦であり、電極部と一体構造の連結部により両電極部１３ａ，１３ｂ間の間隔が高精度に維持されるため、抵抗器抵抗値のバラツキが生ぜず、形状も安定し、上述の課題が解決される。   In the manufacturing method of the present invention, when the resistance alloy plate 17 and the electrodes 11a and 11b are joined, the electrodes 11a and 11b are flat, unlike the bent surfaces, and the electrode portions and the electrode portions are integrated by the connecting portions. Since the distance between 13a and 13b is maintained with high accuracy, the resistance value of the resistor does not vary, the shape is stable, and the above-mentioned problems are solved.

次に、第２実施形態について、図３Ａ乃至図３Ｅを参照して説明する。所定の厚みと幅を有する抵抗合金板材と、所定の厚みと幅を有する金属板材からなる電極材を準備する点は同じであるが、電極材の幅を抵抗合金板材の幅よりも広くし、連結部を抵抗合金板材の幅方向外側に離隔して配置する点で、第１実施形態と異なる。   Next, a second embodiment will be described with reference to FIGS. 3A to 3E. The resistance alloy plate material having a predetermined thickness and width and the point of preparing an electrode material made of a metal plate material having a predetermined thickness and width are the same, but the width of the electrode material is wider than the width of the resistance alloy plate material, It differs from 1st Embodiment by the point which arrange | positions a connection part in the width direction outer side of a resistance alloy board | plate material spaced apart.

まず、電極材１１の中央部に、図３Ａに示すように貫通孔Ｏをプレス加工や研削加工により形成する。これにより、電極材の両端に設けた一対の電極部１３ａ，１３ｂと、この電極部同士を連結する一対の連結部１４ａ，１４ｂを貫通孔Ｏの幅方向の両外側に形成する。貫通孔Ｏの幅Ｗは抵抗合金板材１７の幅Ｔよりも大きく、一対の連結部１４ａ，１４ｂが抵抗合金板材１７の幅方向の両外側に離間して位置する（図３Ｂ（ａ）参照）。   First, as shown in FIG. 3A, a through hole O is formed in the central portion of the electrode material 11 by pressing or grinding. Thereby, a pair of electrode parts 13a and 13b provided at both ends of the electrode material and a pair of connecting parts 14a and 14b for connecting the electrode parts to each other are formed on both outer sides in the width direction of the through hole O. The width W of the through-hole O is larger than the width T of the resistance alloy plate material 17, and the pair of connecting portions 14a and 14b are spaced apart on both outer sides in the width direction of the resistance alloy plate material 17 (see FIG. 3B (a)). .

次に、抵抗合金板材１７の位置決め用の凹みをプレス加工や研削加工等により形成する。そして、図３Ｂに示すように、位置決め用凹みに嵌合するように抵抗合金板材１７を位置合わせして載置し、抵抗合金板材１７を電極部１３ａ，１３ｂの表面に接合する。   Next, a dent for positioning the resistance alloy plate material 17 is formed by pressing or grinding. Then, as shown in FIG. 3B, the resistance alloy plate material 17 is positioned and placed so as to fit in the positioning recess, and the resistance alloy plate material 17 is joined to the surfaces of the electrode portions 13a and 13b.

この状態で、電極材１１の中央部に貫通孔Ｏが形成され、貫通孔Ｏを跨ぐように抵抗合金板材１７の両端部が一対の電極部１３ａ，１３ｂに接合され、抵抗合金板材１７の幅方向両外側に空間的に離間して一対の電極部１３ａ，１３ｂを連結する連結部１４ａ，１４ｂが配置されている。そして、この連結部１４ａ，１４ｂを切断して除去することで、図３Ｃに示すように、抵抗合金板材の表面の両端に金属板材からなる電極材を配置したシャント抵抗器が形成される。   In this state, a through hole O is formed at the center of the electrode material 11, and both ends of the resistance alloy plate material 17 are joined to the pair of electrode portions 13 a and 13 b so as to straddle the through hole O, and the width of the resistance alloy plate material 17. Connection portions 14a and 14b that connect the pair of electrode portions 13a and 13b are arranged spatially separated on both outer sides in the direction. Then, by cutting and removing the connecting portions 14a and 14b, as shown in FIG. 3C, a shunt resistor in which electrode materials made of a metal plate material are arranged at both ends of the surface of the resistance alloy plate material is formed.

このシャント抵抗器においても、電極材１１の中央の貫通孔Ｏを高い寸法精度で形成することで、接合時に電極間の高い寸法精度を連結部により維持でき、第１実施形態と同様に抵抗器抵抗値のバラツキを低減することができる。   Also in this shunt resistor, by forming the through hole O in the center of the electrode material 11 with high dimensional accuracy, high dimensional accuracy between the electrodes can be maintained by the connecting portion at the time of joining, and the resistor is the same as in the first embodiment. Variations in resistance value can be reduced.

これまで本発明の一実施形態について説明したが、本発明は上述の実施形態に限定されず、その技術的思想の範囲内において種々異なる形態にて実施されてよいことは言うまでもない。   Although one embodiment of the present invention has been described so far, it is needless to say that the present invention is not limited to the above-described embodiment, and may be implemented in various forms within the scope of the technical idea.

本発明は、抵抗合金板材表面の対向する両端に金属板材からなる電極材を配設したシャント抵抗器の製造に好適に利用可能である。   INDUSTRIAL APPLICABILITY The present invention can be suitably used for manufacturing a shunt resistor in which an electrode material made of a metal plate material is disposed at both opposing ends of the resistance alloy plate material surface.

Claims (5)

所定の厚みと幅を有する抵抗合金板材と、所定の厚みと幅を有する金属板材からなる電極材を準備し、
該電極材の両端に所定の厚みと幅を有する一対の電極部と、該電極部同士を連結する連結部を形成し、
該連結部は前記電極部の幅よりも狭く、且つ、前記電極部の表面からその厚み方向に離間した位置に配置され、
前記抵抗合金板材の両端部を、前記一対の電極部の表面に接合し、
前記連結部を切断して除去する、シャント抵抗器の製造方法。 Prepare a resistance alloy plate material having a predetermined thickness and width, and an electrode material made of a metal plate material having a predetermined thickness and width,
Forming a pair of electrode portions having a predetermined thickness and width at both ends of the electrode material, and a connecting portion for connecting the electrode portions;
The connecting portion is narrower than the width of the electrode portion, and is disposed at a position spaced from the surface of the electrode portion in the thickness direction,
Bonding both ends of the resistance alloy plate to the surface of the pair of electrode parts,
A method of manufacturing a shunt resistor, wherein the connecting portion is cut and removed. 前記電極材は複数の前記連結部を備える、請求項１に記載のシャント抵抗器の製造方法。   The shunt resistor manufacturing method according to claim 1, wherein the electrode material includes a plurality of the connecting portions. 前記連結部の裏面は前記一対の電極部のそれぞれの裏面と同一面をなしている、請求項１に記載のシャント抵抗器の製造方法。   The shunt resistor manufacturing method according to claim 1, wherein a back surface of the connecting portion is flush with a back surface of each of the pair of electrode portions. 前記抵抗合金板材と前記電極材とは、圧接により接合される、請求項１に記載のシャント抵抗器の製造方法。   The shunt resistor manufacturing method according to claim 1, wherein the resistance alloy plate material and the electrode material are joined by pressure welding. 所定の厚みと幅を有する抵抗合金板材と、所定の厚みと幅を有する金属板材からなる電極材を準備し、
該電極材に貫通孔を形成し、一対の電極部とこの電極部同士を連結する一対の連結部を前記貫通孔の幅方向の両外側に形成し、
前記貫通孔の幅は前記抵抗合金板材の幅よりも大きく、
前記抵抗合金板材の両端部と前記一対の電極部とを接合し、
前記連結部を切断して除去する、シャント抵抗器の製造方法。 Prepare a resistance alloy plate material having a predetermined thickness and width, and an electrode material made of a metal plate material having a predetermined thickness and width,
A through hole is formed in the electrode material, a pair of electrode portions and a pair of connecting portions that connect the electrode portions are formed on both outer sides in the width direction of the through hole,
The width of the through hole is larger than the width of the resistance alloy plate,
Bonding both ends of the resistance alloy plate and the pair of electrodes,
A method of manufacturing a shunt resistor, wherein the connecting portion is cut and removed.
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