JPH09225649A - Pressurizing force measuring instrument for welding electrode - Google Patents
Pressurizing force measuring instrument for welding electrodeInfo
- Publication number
- JPH09225649A JPH09225649A JP5834696A JP5834696A JPH09225649A JP H09225649 A JPH09225649 A JP H09225649A JP 5834696 A JP5834696 A JP 5834696A JP 5834696 A JP5834696 A JP 5834696A JP H09225649 A JPH09225649 A JP H09225649A
- Authority
- JP
- Japan
- Prior art keywords
- load
- detection
- flexible
- welding electrode
- core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は抵抗溶接機において
相対向する二つの溶接電極間の加圧力を測定する為の溶
接電極の加圧力測定装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding electrode pressure measuring device for measuring a pressure applied between two welding electrodes facing each other in a resistance welding machine.
【０００２】[0002]
【従来の技術】この種の測定装置としては、二つの溶接
電極の間に挟まれてそれらからの加圧力を受けるように
したチップを備え、そのチップに抵抗線歪ゲージを接着
したものがある（例えば実開平５−９３６７４号公報参
照）。2. Description of the Related Art As a measuring device of this type, there is one in which a tip is sandwiched between two welding electrodes so as to receive a pressing force from them, and a resistance wire strain gauge is adhered to the tip. (See, for example, Japanese Utility Model Laid-Open No. 5-93674).
【０００３】上記構成のものにあっては、溶接電極から
の加圧力による荷重が上記チップに加わるとチップが圧
縮変形を受ける為、歪ゲージがチップと一緒に変形し、
歪ゲージの電気抵抗が変化する。従って、その抵抗値の
変化から上記加圧力を電気的に測定することが出来る。In the above-mentioned structure, when the load due to the pressure applied from the welding electrode is applied to the tip, the tip undergoes compressive deformation, so that the strain gauge deforms together with the tip.
The electrical resistance of the strain gauge changes. Therefore, the applied pressure can be electrically measured from the change in the resistance value.
【０００４】[0004]
【発明が解決しようとする課題】この従来の溶接電極の
加圧力測定装置では溶接電極からチップに加わる荷重が
過大であるとチップの圧縮変形が対応して大きくなり、
チップから歪ゲージが剥がれて破損し易い問題点があっ
た。In this conventional welding electrode pressure measuring device, if the load applied from the welding electrode to the tip is excessive, the compressive deformation of the tip correspondingly increases,
There was a problem that the strain gauge was easily peeled off from the chip and was easily damaged.
【０００５】本件出願の溶接電極の加圧力測定装置は上
記従来技術の問題点を解決する為に提供するものであ
る。本件出願の目的は、二つの溶接電極からの加圧力に
より検出コアを変形させ、その変形による検出コアの透
磁率の変化を検出コイルでもって検出することによっ
て、電気的に上記加圧力を測定できるようにすることで
ある。他の目的は、上記加圧力によって検出コアに加わ
る荷重が過大となっても、検出コアの変形をその弾性限
度内に制限させて、上記加圧力を除去すれば検出コアを
初期状態に復元させて再び正常動作させられるようにし
た加圧力測定装置を提供することである。換言すれば、
破損が生じ難いようにした加圧力測定装置を提供するこ
とである。他の目的は、加圧力の除去により一定の無荷
重出力を生ずることができるようにすることである。他
の目的は、過大となる荷重を加えさえすれば、その荷重
の大きさに関係なく一定となる最大荷重出力を生ずるこ
とが出来るようにすることである。他の目的及び利点は
図面及びそれに関連した以下の説明により容易に明らか
になるであろう。The welding electrode pressure measuring device of the present application is provided in order to solve the above-mentioned problems of the prior art. The purpose of the present application is to electrically measure the above-mentioned pressure force by deforming the detection core by the pressure force from the two welding electrodes and detecting the change in the magnetic permeability of the detection core due to the deformation with the detection coil. To do so. Another purpose is to limit the deformation of the detection core within its elastic limit even if the load applied to the detection core becomes excessive due to the above-mentioned pressure, and restore the detection core to the initial state by removing the above-mentioned pressure. It is to provide a pressing force measuring device that can be normally operated again. In other words,
It is an object of the present invention to provide a pressing force measuring device that is less likely to be damaged. Another object is to be able to produce a constant unloaded output by removing the applied pressure. Another object is to be able to generate a maximum load output that is constant regardless of the magnitude of the load, even if an excessive load is applied. Other objects and advantages will be more readily apparent from the drawings and the following description associated therewith.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成する為
に、本願発明における溶接電極の加圧力測定装置は、検
出コアは間隙を隔てて相対向する位置に二つの可撓部を
有していて、相対向する二つの溶接電極から上記両可撓
部に加わる荷重により可撓部が内方向に変形することに
よって透磁率が変化するようにしてあり、上記検出コア
には、検出コアの透磁率の変化を検出して対応検出信号
を出力する検出コイルを付設している溶接電極の加圧力
測定装置において、上記二つの可撓部の間に、溶接電極
からの荷重による可撓部の内方向への変形をその弾性限
度内に制限する為の制限部材を備えさせたものである。In order to achieve the above object, in the welding electrode pressing force measuring device according to the present invention, the detecting core has two flexible portions at positions facing each other with a gap. Then, the magnetic permeability is changed by the inward deformation of the flexible portion due to the load applied to the both flexible portions from the two welding electrodes facing each other. In a welding electrode pressure force measuring device equipped with a detection coil that detects a change in magnetic susceptibility and outputs a corresponding detection signal, between the two flexible portions, the flexible portion due to the load from the welding electrode is It is provided with a limiting member for limiting the deformation in the direction within its elastic limit.
【０００７】[0007]
【発明の実施の形態】以下本願発明の実施の形態を示す
図面について説明する。加圧力測定装置の全体を示す図
１において、Ａは加圧力を検出しその大きさに応じた電
気信号を出力する検出具、Ｂは検出具Ａからの電気信号
を受けて上記加圧力の大きさを表示する表示具を夫々示
す。検出具Ａは手持ちによって被測定部に宛がうように
したものを示す。該検出具Ａにおける１は握り、２は元
部を握り１に連結した保持枠、３は保持枠２に取付けた
検出器で、加えられる荷重を電気信号に変換する為のも
のである。４は検出具Ａを表示具Ｂに対して電気的に接
続する接続コードで、先端にはコネクタ５を備える。表
示具Ｂにおける６は検出された加圧力の大きさを表示す
る為の表示窓、７は上記コネクタ５を着脱自在に接続す
る為のコネクタを夫々示す。尚８，９は抵抗溶接機にお
ける相対向する二つの溶接電極を示す。DETAILED DESCRIPTION OF THE INVENTION The drawings showing the embodiments of the present invention will be described below. In FIG. 1 showing the entire pressurizing force measuring device, A is a detector for detecting the pressurizing force and outputting an electric signal according to the magnitude thereof, and B is a magnitude of the above-mentioned pressurizing force upon receiving an electric signal from the detector A. The respective display tools for displaying the height are shown. The detection tool A is a tool that is held by a hand so as to be applied to the measured portion. In the detection tool A, 1 is a grip, 2 is a holding frame whose base is connected to the grip 1, and 3 is a detector attached to the holding frame 2 for converting an applied load into an electric signal. Reference numeral 4 is a connection cord for electrically connecting the detection tool A to the display tool B, and a connector 5 is provided at the tip. Reference numeral 6 in the display tool B indicates a display window for displaying the magnitude of the detected pressing force, and reference numeral 7 indicates a connector for detachably connecting the connector 5. Reference numerals 8 and 9 denote two welding electrodes facing each other in the resistance welding machine.
【０００８】次に検出器３を詳細に示す図２、図３につ
いて説明する。11は検出コアで、自体に加えられる荷重
を電気的検出が可能な変量に変換する為のものであり、
加えられる荷重の大きさに対応して透磁率が変化するよ
うにした磁気コアを示す。該検出コア11は加えられる荷
重の大きさに対して出来るだけ大きな検出信号を得られ
るようにする為に高磁歪材料例えばパーマロイやニッケ
ルクロム鋼等のニッケル鉄合金で形成すると良い。12は
検出コア11の透磁率の変化の検出の為に該検出コア11を
励磁する励磁コイルである。13は検出コア11の透磁率の
変化を検出して対応検出信号を出力する為の検出コイル
で、透磁率の大きさに応じた数の磁束が鎖交することに
よりその磁束数に対応した電圧が誘起されるようにした
コイルを示す。12ａ，13ａはそれらのコイルのリード線
で前記コード４に接続している。14，15は被測定荷重を
上記検出コア11に伝達する為の荷重伝達部材を示す。Next, FIGS. 2 and 3 showing the detector 3 in detail will be described. 11 is a detection core, which is for converting the load applied to itself into a variable that can be detected electrically,
A magnetic core whose magnetic permeability changes according to the magnitude of the applied load is shown. The detection core 11 is preferably made of a high magnetostrictive material, for example, a nickel-iron alloy such as permalloy or nickel-chromium steel in order to obtain a detection signal as large as possible with respect to the magnitude of the applied load. Reference numeral 12 is an exciting coil for exciting the detection core 11 in order to detect a change in magnetic permeability of the detection core 11. Reference numeral 13 is a detection coil for detecting a change in magnetic permeability of the detection core 11 and outputting a corresponding detection signal, and a voltage corresponding to the number of magnetic fluxes is generated by interlinking a number of magnetic fluxes corresponding to the magnitude of magnetic permeability. 3 shows a coil in which is induced. 12a and 13a are connected to the cord 4 by the lead wires of those coils. Reference numerals 14 and 15 denote load transmitting members for transmitting the measured load to the detection core 11.
【０００９】上記検出コア11について説明する。検出コ
ア11は、閉磁路が形成され、且つその閉磁路の途中に荷
重の印加によって透磁率が大きく変化する部分が存在す
るよう、図４に符号17，18，19，20で示される部分から
成る環状の形状に形成している。上記閉磁路の形成の目
的は、透磁率の変化の検出効率を高める為である。透磁
率が大きく変化する部分をその閉磁路の途中に存在させ
る目的は、透磁率の変化の検出を容易化する為である。
17，18は上記荷重の印加により変形して透磁率が大きく
変化するようにした可撓部で、相対向する二つの溶接電
極８，９からの加圧力を受ける為に相互間に間隙G0を隔
てて相対向する状態に備わっている。これらの可撓部1
7，18は、図２の状態において夫々の中央部に上下から
の荷重を受けることにより撓み変形するようにした梁形
状のものを例示する。該可撓部17，18はその撓み変形に
より透磁率が変化する。17ａ，18ａは夫々荷重を受ける
為の荷重受面を示す。19，20は上記可撓部17，18をそれ
らが撓み変形を生ずることが出来るように支える為の支
持部で、可撓部17，18をそれらの両端で支持するように
している。上記可撓部17，18における21は荷重伝達部材
14，15を装着する為の装着孔で、部材14，15から加えら
れる荷重を荷重受面17ａ，18ａの夫々中央部で受けるよ
うにする為に、各可撓部材17，18の夫々中央部に形成し
ている。支持部19における22はコイル装着部を示し、励
磁コイル12及び検出コイル13は該装着部22の周囲に巻回
させることによって備えられている。The detection core 11 will be described. The detection core 11 has a closed magnetic circuit formed, and in order to have a portion whose magnetic permeability greatly changes due to the application of a load in the middle of the closed magnetic circuit, from the portions indicated by reference numerals 17, 18, 19, 20 in FIG. It is formed into a ring shape. The purpose of forming the closed magnetic circuit is to increase the detection efficiency of the change in magnetic permeability. The purpose of allowing the portion where the magnetic permeability changes greatly to exist in the middle of the closed magnetic circuit is to facilitate the detection of the change in magnetic permeability.
Numerals 17 and 18 are flexible portions which are deformed by the application of the above load so that the magnetic permeability greatly changes, and a gap G0 is formed between them in order to receive the pressure from the two welding electrodes 8 and 9 facing each other. It is provided in a state where they are separated from each other and face each other. These flexible parts 1
In the state of FIG. 2, 7 and 18 are beam-shaped ones which are adapted to be flexibly deformed by receiving a load from above and below on their respective central portions. The magnetic permeability of the flexible portions 17 and 18 changes due to the bending deformation. Reference numerals 17a and 18a denote load receiving surfaces for receiving loads, respectively. Reference numerals 19 and 20 are support portions for supporting the flexible portions 17 and 18 so that they can be flexibly deformed, and the flexible portions 17 and 18 are supported at both ends thereof. Reference numeral 21 in the flexible portions 17 and 18 is a load transmission member.
In order to receive the loads applied from the members 14 and 15 at the central portions of the load receiving surfaces 17a and 18a, the central portions of the flexible members 17 and 18 are mounted in the mounting holes for mounting the members 14 and 15, respectively. Is formed. Reference numeral 22 in the support portion 19 indicates a coil mounting portion, and the exciting coil 12 and the detection coil 13 are provided by being wound around the mounting portion 22.
【００１０】次に、荷重伝達部材14，15は、溶接電極
８，９において被溶接物と接触する為の先端8a，9aの形
状の違いによらず、それらの電極８，９からの加圧力を
検出コア11における荷重受面17ａ，18ａの各所定位置
（この例では夫々の中央部）に加え得るようにする為に
備えたものである。荷重伝達部材14について説明する。
該部材14は、該加圧力測定装置で測定しようとする最大
の荷重に対しても耐え得る充分な強度を保有せしめる為
にその本体24を金属材料で形成し、その一面に溶接電極
８との絶縁の為の絶縁体25を備えさせて構成している。
上記本体24は検出コア11に対して磁気的な影響を与えぬ
ようにする為に非磁性材料を用いている。例えばステン
レスで形成している。絶縁体25は、溶接電極８，９間の
加圧力の測定を行う場合に、誤ってそれらの電極８，９
間に溶接用の電圧が加わっていても短絡事故が発生する
ことを防止する為のものである。該絶縁体25としては例
えば補強用の布が埋め込まれている布入りベークライト
が用いられ、上記本体24に接着手段により取付けてい
る。26は可撓部17に対する部材14の止付の為の止付片
で、着脱操作を可能にする為に装着孔21に対する抜き差
しを自在にしてある。27は止付片26が装着孔21から不測
的に脱落することを防止し、一方手操作による抜き差し
は可能にする為の部材で、例えば止付片26の周囲に嵌着
したスナップリングである。28は後述する制限部材32の
為の保持部で、止付片26の先に装着孔21から突出するよ
うに備えさせている。29は荷重受面17ａに当接してそこ
に荷重を伝える為の伝達部で、可撓部17において支持部
19，20と接続している部分から出来るだけ離れた箇所に
荷重を印加する為に、止付片26に隣接したその周囲の場
所に凸状に周設して、装着孔21の周縁部分の荷重受面17
ａのみに局所的に荷重を印加するようにしている。G1は
可撓部17が撓んだときに荷重伝達部材14における不要箇
所が荷重受面17ａに接触することを防止する為の隙間
で、上記伝達部29を設けることによりその周囲の部分に
おける本体24の前面30と荷重受面17ａとの間に形成して
いる。次に荷重伝達部材15は絶縁体25を備えぬ点を除き
上記部材14と均等の構成であって説明が重複するので、
均等の構成の部分には部材14と同じ符号を付して重複す
る説明を省略する。31は溶接電極９の先端9aに対して宛
がう為の当部を示し、先端9aに対して宛がうべき位置を
明確にし且つ宛がった状態で先端9aに対する横ずれを防
止する為に凹部の形状に形成している。尚上記荷重伝達
部材15は、種々の形状の溶接電極例えばスポット溶接用
の電極或いはシーム溶接用の電極などの夫々の先端に対
応した形状の当部31を備えるものを複数種準備し、それ
らを交換的に可撓部18に取付けて利用すると良い。Next, the load transmitting members 14 and 15 apply pressure from the electrodes 8 and 9 regardless of the shapes of the tips 8a and 9a for contacting the objects to be welded in the welding electrodes 8 and 9. Is added to each predetermined position of the load receiving surfaces 17a, 18a of the detection core 11 (in this example, each central portion). The load transmission member 14 will be described.
The main body 24 of the member 14 is made of a metal material so as to have sufficient strength to withstand the maximum load to be measured by the pressing force measuring device, and the main body 24 is formed on one surface thereof with the welding electrode 8. It is configured by including an insulator 25 for insulation.
The main body 24 is made of a non-magnetic material so as not to exert a magnetic influence on the detection core 11. For example, it is made of stainless steel. The insulator 25 is erroneously used when measuring the pressure applied between the welding electrodes 8 and 9.
This is to prevent a short circuit accident from occurring even if a welding voltage is applied in between. As the insulator 25, for example, a bakelite with a cloth in which a reinforcing cloth is embedded is used, and is attached to the main body 24 by an adhesive means. Numeral 26 is a retaining piece for retaining the member 14 with respect to the flexible portion 17, which can be freely inserted into and removed from the mounting hole 21 in order to enable the attachment / detachment operation. Reference numeral 27 is a member for preventing the stopper piece 26 from accidentally falling out of the mounting hole 21, and for allowing the stopper piece 26 to be manually inserted and removed, for example, a snap ring fitted around the stopper piece 26. . Reference numeral 28 denotes a holding portion for a limiting member 32, which will be described later, and is provided at the tip of the stop piece 26 so as to project from the mounting hole 21. Reference numeral 29 is a transmission portion for abutting against the load receiving surface 17a and transmitting the load thereto, which is a support portion in the flexible portion 17.
In order to apply a load to a place as far as possible from the part connected to 19, 20, the peripheral part of the mounting hole 21 is provided in a convex shape around the stopper piece 26 in the vicinity thereof. Load receiving surface 17
The load is locally applied only to a. G1 is a gap for preventing an unnecessary portion of the load transmitting member 14 from contacting the load receiving surface 17a when the flexible portion 17 bends, and by providing the transmitting portion 29, the main body in the peripheral portion thereof is provided. It is formed between the front surface 30 of 24 and the load receiving surface 17a. Next, since the load transmitting member 15 has the same configuration as the member 14 except that the insulator 25 is not provided, the description will be duplicated.
The parts having the same configuration are denoted by the same reference numerals as those of the member 14, and the overlapping description will be omitted. Reference numeral 31 denotes a portion for applying the welding electrode 9 to the tip 9a, in order to clarify the position to be applied to the tip 9a and to prevent the lateral displacement with respect to the tip 9a in the addressed state. It is formed in the shape of a recess. The load transmitting member 15 is prepared by preparing a plurality of kinds of welding electrodes having various shapes, such as a spot welding electrode or a seam welding electrode having a corresponding contact portion 31 at the tip thereof. It may be exchangeably attached to the flexible portion 18 and used.
【００１１】次に32は、検出コア11の破損防止の為に可
撓部17，18の変形をそれらの弾性限度内に制限する制限
部材であり、両可撓部17，18の間に配設している。32
ａ，32ｂは可撓部17，18を夫々受け止める為の受面で、
該部材32の一方及び他方の端面をもって構成している。
該制限部材32は検出コア11に磁気的な影響を与えぬよう
非磁性材料例えばステンレス製であり、円環状に形成し
て上記保持部28の周囲に位置させている。G2は可撓部1
7，18の変形を許容する隙間を示し、その大きさは、可
撓部17，18の変形をそれらの弾性限度内に留め得る大き
さ（例えば０．１ｍｍ）にしてある。該隙間G2は、図で
は制限部材32と可撓部17における荷重受面17ａとは反対
側の面（以下反対面と呼ぶ）17ｂとの間に生じている状
態を示すが、制限部材32と可撓部18における反対面18ｂ
との間或いはそれらの両方の箇所に分かれて生じている
場合もある。Next, 32 is a limiting member for limiting the deformation of the flexible portions 17 and 18 within their elastic limits in order to prevent damage to the detection core 11, and is arranged between the flexible portions 17 and 18. I have set up. 32
a and 32b are receiving surfaces for receiving the flexible portions 17 and 18, respectively.
The member 32 has one and the other end faces.
The limiting member 32 is made of a non-magnetic material such as stainless so as not to exert a magnetic influence on the detection core 11, is formed in an annular shape, and is located around the holding portion 28. G2 is the flexible part 1
A gap for allowing the deformation of 7 and 18 is shown, and the size thereof is set to a size (for example, 0.1 mm) that can keep the deformation of the flexible portions 17 and 18 within their elastic limits. Although the gap G2 is shown between the limiting member 32 and the surface 17b of the flexible portion 17 on the opposite side of the load receiving surface 17a (hereinafter referred to as the opposite surface) 17b, Opposite surface 18b of the flexible portion 18
It may occur between or between or both of them.
【００１２】上記構成の検出器３は図３に示される止付
部材例えばビス34によって上記保持枠２に止め付けてい
る。尚保持枠２は検出要素に磁気的な影響を与えぬよう
非磁性材料例えばステンレス製である。33は検出コア11
の側面の開口部からごみや埃が入ることを防止する為の
カバーで、保持枠２の一部をもって構成している。The detector 3 having the above structure is fixed to the holding frame 2 by a fixing member such as a screw 34 shown in FIG. The holding frame 2 is made of a non-magnetic material such as stainless steel so as not to magnetically affect the detection element. 33 is the detection core 11
It is a cover for preventing dust and dirt from entering through the opening on the side surface of the holding frame 2 and is constituted by a part of the holding frame 2.
【００１３】図５は上記表示具Ｂの回路構成をブロック
で示すものである。36は励磁コイル12に励磁信号を与え
る為の励磁回路である。励磁信号としては、検出コア11
や励磁及び検出コイル12，13を効率よく機能させる為に
例えば数ＫＨｚ乃至数１０ＫＨｚの交流信号を用いる。
37は検出コイル13からの検出信号を受けて加圧力の大き
さの表示を行う表示回路を示す。該表示回路37は検出コ
イル13の検出信号例えばその電圧値から所定の変換テー
ブルに基づいて加圧力の値を求めその値を表示窓６に表
示するようにしたものである。FIG. 5 is a block diagram showing the circuit configuration of the display B. Reference numeral 36 is an exciting circuit for giving an exciting signal to the exciting coil 12. As the excitation signal, the detection core 11
In order to make the excitation and detection coils 12 and 13 function efficiently, an AC signal of, for example, several KHz to several tens KHz is used.
Reference numeral 37 denotes a display circuit which receives the detection signal from the detection coil 13 and displays the magnitude of the pressing force. The display circuit 37 obtains the value of the pressing force from the detection signal of the detection coil 13, for example, its voltage value based on a predetermined conversion table and displays the value on the display window 6.
【００１４】上記構成の加圧力測定装置による溶接電極
８，９相互間の加圧力の測定は以下のように行う。検出
具Ａの握り１を手に持ち当部31を溶接電極９の先端9aに
宛がう。次に溶接電極８を下降させてその先端8aを絶縁
体25の面25ａに当接させ、加圧力を加える。するとその
加圧力が検出器３で検出され、検出信号が表示具Ｂに与
えられてその数値が表示窓６に表示される。The pressing force between the welding electrodes 8 and 9 is measured by the pressing force measuring device having the above structure as follows. Holding the grip 1 of the detection tool A in the hand, the abutting portion 31 is applied to the tip 9a of the welding electrode 9. Next, the welding electrode 8 is lowered and its tip 8a is brought into contact with the surface 25a of the insulator 25 to apply a pressing force. Then, the pressing force is detected by the detector 3, the detection signal is given to the display tool B, and the numerical value is displayed on the display window 6.
【００１５】上記測定の場合における検出器３の動作は
以下の通りである。励磁コイル12は励磁回路36から与え
られる励磁信号により磁束を発生し、検出コア11にはそ
の透磁率に応じた磁束が通っている。この磁束は、励磁
信号が前述のような周波数であるので、表皮効果により
検出コア11の主として表層を通る磁束Φ1a，Φ1bとなっ
ている。検出コア11の外周側の表層を通る磁束を符号Φ
1aで、内周側の表層を通る磁束を符号Φ1bで夫々示す。
そして検出コイル13はそれらの磁束Φ1a，Φ1bの総和に
応じた検出信号例えば電圧値を出力している。The operation of the detector 3 in the above measurement is as follows. The exciting coil 12 generates a magnetic flux according to the exciting signal given from the exciting circuit 36, and the detecting core 11 has a magnetic flux corresponding to its magnetic permeability. Since the excitation signal has the above-described frequency, the magnetic fluxes are magnetic fluxes Φ1a and Φ1b mainly passing through the surface layer of the detection core 11 due to the skin effect. The magnetic flux passing through the surface layer on the outer peripheral side of the detection core 11 is denoted by Φ
In FIG. 1a, the magnetic flux passing through the surface layer on the inner peripheral side is indicated by the symbol Φ1b.
Then, the detection coil 13 outputs a detection signal, for example, a voltage value according to the sum of the magnetic fluxes Φ1a and Φ1b.
【００１６】検出コア11に荷重が加わっていない場合、
可撓部17，18は何等変形のない状態（この状態を本件明
細書中においては初期状態と呼ぶ）であって、その透磁
率はそれに応じた値（この値を本件明細書中においては
初期値と呼ぶ）であり、検出コイル13の出力はそれに対
応した出力（この出力を本件明細書中においては無荷重
出力と呼ぶ）である。When no load is applied to the detection core 11,
The flexible portions 17 and 18 are in a state without any deformation (this state is referred to as an initial state in the present specification), and the magnetic permeability has a value (the initial value in the present specification) corresponding thereto. The output of the detection coil 13 is an output corresponding to it (this output is referred to as a no-load output in the present specification).
【００１７】加圧力の測定の場合、上記のような操作に
よって溶接電極８，９間に加わる加圧力は、検出コア11
の可撓部17，18に荷重として加わる。可撓部17，18はそ
の荷重により変形して検出コア11の透磁率が変化する。
その結果、検出コイル13による検出信号が変化する。詳
細に説明すると、上記溶接電極８，９間の加圧力は、荷
重伝達部材14，15を介して検出コア11の可撓部17，18に
それらに対する荷重として加わり、可撓部17，18が内方
向に撓む。即ち、各荷重伝達部材14，15の伝達部29が荷
重受面17ａ，18ａを押す。この為、可撓部17，18は夫々
の反対面17ｂ，18ｂが相互に接近する方向に弾性変形す
る。すると各可撓部17，18における荷重受面17ａ，18ａ
側の部分は夫々圧縮応力が加わり、反対面17ｂ，18ｂ側
の部分は引張応力が加わる。In the case of measuring the pressing force, the pressing force applied between the welding electrodes 8 and 9 by the above operation is the detection core 11
It is applied as a load to the flexible parts 17 and 18 of. The flexible portions 17 and 18 are deformed by the load, and the magnetic permeability of the detection core 11 changes.
As a result, the detection signal from the detection coil 13 changes. More specifically, the pressing force between the welding electrodes 8 and 9 is applied as a load to the flexible portions 17 and 18 of the detection core 11 via the load transmission members 14 and 15, and the flexible portions 17 and 18 are Bend inward. That is, the transmission portion 29 of each load transmission member 14, 15 pushes the load receiving surfaces 17a, 18a. Therefore, the flexible portions 17 and 18 are elastically deformed in the directions in which the opposite surfaces 17b and 18b approach each other. Then, the load receiving surfaces 17a and 18a of the flexible portions 17 and 18 are formed.
A compressive stress is applied to each of the side portions, and a tensile stress is applied to the opposite surface 17b, 18b side portion.
【００１８】上記可撓部17，18の各部に上記のような応
力が加わると上記磁束が通っている場所の透磁率が夫々
変化する。透磁率の変化は、ニッケル系磁性材料の一般
的性質として、圧縮に対しては減少であってその変化の
程度は大きく、引張に対しては増加であってその変化の
程度は小さい。従って上記磁束Φ1aは大きく減少し、磁
束Φ1bは僅かに増加する。その結果、検出コア11を通る
磁束の総和は減少し、検出コイル13によって検出される
電圧値は減少する。該減少した電圧値が検出信号として
出力される。When the above-mentioned stress is applied to each part of the flexible parts 17 and 18, the magnetic permeability changes where the magnetic flux passes. As a general property of the nickel-based magnetic material, the change in magnetic permeability is a decrease with compression and a large change, and an increase with tensile and a small change. Therefore, the magnetic flux Φ1a is greatly reduced and the magnetic flux Φ1b is slightly increased. As a result, the total amount of magnetic flux passing through the detection core 11 decreases, and the voltage value detected by the detection coil 13 decreases. The reduced voltage value is output as a detection signal.
【００１９】溶接電極８を荷重伝達部材14から離反させ
て検出コア11に対する荷重をゼロにすると可撓部17，18
は初期状態に復元し、検出コア11の透磁率は初期値に復
元する。その結果、検出コイル13の検出信号は無荷重出
力に戻る。When the welding electrode 8 is separated from the load transmitting member 14 so that the load applied to the detection core 11 becomes zero, the flexible parts 17, 18 are formed.
Is restored to the initial state, and the magnetic permeability of the detection core 11 is restored to the initial value. As a result, the detection signal of the detection coil 13 returns to the unloaded output.
【００２０】次に上記構成の加圧力測定装置において
は、上記測定の場合、誤って溶接電極８，９間に加圧力
測定装置の最大測定荷重を越える過大な加圧力が加わっ
ても、検出器３の破損は防止される。即ち、荷重伝達部
材14，15から可撓部17，18に加わる荷重が増大するとそ
れに応じて可撓部17，18の変形は大きくなる。しかしそ
の変形が可撓部17，18の弾性限度を越える前に反対面17
ｂ，18ｂが制限部材32の受面32ａ，32ｂに当接する。そ
の結果、可撓部17，18はその制限部材32に受止められて
それ以上の変形が阻止される。これにより検出コア11は
永久変形から免れ、上記加圧力の除去による初期状態へ
の復元が可能な状態に保たれる。尚上記最大測定荷重と
は、上記反対面17ｂ，18ｂが制限部材32に当接する状態
となる場合の最小の荷重をいう。又本件明細書中では、
そのときの検出コア11の変形状態を最大変形状態と呼
び、そのときの透磁率を最大変化値と呼び、そのときの
検出コイルの出力を最大荷重出力と呼ぶ。Next, in the force measuring device having the above structure, in the case of the above measurement, even if an excessive force exceeding the maximum measurement load of the force measuring device is erroneously applied between the welding electrodes 8 and 9, the detector Damage to item 3 is prevented. That is, when the load applied from the load transmitting members 14 and 15 to the flexible portions 17 and 18 increases, the deformation of the flexible portions 17 and 18 increases accordingly. However, before the deformation exceeds the elastic limit of the flexible parts 17 and 18, the opposite surface 17
b and 18b contact the receiving surfaces 32a and 32b of the limiting member 32. As a result, the flexible portions 17 and 18 are received by the limiting member 32, and further deformation is prevented. As a result, the detection core 11 is escaped from permanent deformation, and is kept in a state where it can be restored to the initial state by removing the pressing force. The maximum measured load is the minimum load when the opposite surfaces 17b and 18b come into contact with the limiting member 32. Moreover, in the present specification,
The deformed state of the detection core 11 at that time is called the maximum deformed state, the magnetic permeability at that time is called the maximum change value, and the output of the detection coil at that time is called the maximum load output.
【００２１】次に上記検出具Ａにあっては、荷重伝達部
材14，15に加える荷重の除去によって検出信号を無荷重
出力に出来るは勿論のこと、次のような操作により容易
に検出信号を最大荷重出力とすることが出来る。即ち、
大きな加圧力を加えることの出来る手近な器具例えばバ
イスを用い、図６に示すように検出器３をバイス40の一
対の口金41，41の間に挟む。そしてバイスを徐々に締め
て荷重伝達部材14，15間に徐々に荷重を加えていく。こ
のとき検出コイル13の出力は荷重の増加と共に例えば図
７に示すように変化する。そして荷重が最大測定荷重と
なると、図６に示すように可撓部17，18が制限部材32に
当接する。このとき検出コイル13の出力は最大荷重出力
となる。その後は荷重を増加させても可撓部17，18は変
形せぬので、検出コイル13は最大荷重出力を出力したま
まである。即ちバイスを検出信号が変化せぬようになる
ところまで締めることによって、容易に最大荷重出力を
生じさせることが出来る。このようにして容易に出力さ
せることの出来る最大荷重出力と上記無荷重出力とは、
表示回路37の校正に利用することが出来る。Next, in the above-mentioned detecting tool A, the detection signal can be output without load by removing the load applied to the load transmitting members 14 and 15, and the detection signal can be easily output by the following operation. The maximum load output can be set. That is,
As shown in FIG. 6, the detector 3 is sandwiched between the pair of bases 41, 41 of the vise 40 by using a handy device, such as a vise, which can apply a large pressing force. Then, the vise is gradually tightened to gradually apply the load between the load transmitting members 14 and 15. At this time, the output of the detection coil 13 changes as the load increases, for example, as shown in FIG. When the load reaches the maximum measured load, the flexible portions 17 and 18 come into contact with the limiting member 32 as shown in FIG. At this time, the output of the detection coil 13 becomes the maximum load output. After that, since the flexible parts 17 and 18 are not deformed even if the load is increased, the detection coil 13 keeps outputting the maximum load output. That is, the maximum load output can be easily generated by tightening the vise until the detection signal does not change. In this way, the maximum load output that can be easily output and the non-load output are
It can be used for calibration of the display circuit 37.
【００２２】次に検出コアにおける可撓部の変形を弾性
限度内に制限する為の手段の異なる実施形態を示す図
８、９について説明する。これらの図は、可撓部に最大
測定荷重以上の力が決して加わらぬようにすることによ
り検出器の精度保持の安定性を向上させることを目的と
するものである。図において、制限部材43は各荷重伝達
部材14ｅ，15ｅにおける止付片26ｅの先部にそれと一体
形成することによって備えさせている。各荷重伝達部材
14ｅ，15ｅにおける制限部材43の長さは、可撓部17ｅ，
18ｅの変形が夫々の弾性限度の範囲内にある状態におい
て制限部材43の先端相互が当接する状態となる長さにし
ている。Next, FIGS. 8 and 9 showing different embodiments of means for limiting the deformation of the flexible portion of the detection core within the elastic limit will be described. The purpose of these figures is to improve the stability of accuracy holding of the detector by never applying a force larger than the maximum measurement load to the flexible portion. In the figure, the limiting member 43 is provided by being integrally formed with the tip of the stopper piece 26e of each load transmitting member 14e, 15e. Each load transmission member
The length of the restriction member 43 in 14e and 15e is the same as that of the flexible portion 17e and
The length is set such that the tips of the restricting members 43 come into contact with each other when the deformations of 18e are within the respective elastic limits.
【００２３】上記構成のものにあっては、荷重伝達部材
14ｅ，15ｅに加えられる荷重が最大測定荷重までの範囲
では、それらを介して可撓部17ｅ，18ｅに加わる荷重に
応じて可撓部17ｅ，18ｅが撓む。荷重伝達部材14ｅ，15
ｅに加わる荷重の大きさが最大測定荷重となると、図９
に示すように上記制限部材43の先端面43ａが相互に当接
する。そしてそれ以上の荷重が荷重伝達部材14ｅ，15ｅ
に加わると、最大測定荷重を越える分に対しては制限部
材43が応え、可撓部17ｅ，18ｅには最大測定荷重のみが
加わる。このように可撓部には最大測定荷重以上の荷重
は何等加わらぬ為、それらは機械的或いは磁気的な変性
が生じ難く、従って長期にわたって安定な作動を行わせ
ることが出来、良好な精度を安定に保持させることが出
来る。なお、機能上前図のものと同一又は均等の構成で
説明が重複すると考えられる部分には、前図と同一の符
号にアルファベットのｅを付して重複する説明を省略し
た。In the above structure, the load transmitting member
In the range where the load applied to 14e and 15e is up to the maximum measurement load, the flexible parts 17e and 18e bend according to the load applied to the flexible parts 17e and 18e through them. Load transmission members 14e, 15
When the magnitude of the load applied to e becomes the maximum measurement load,
As shown in, the tip surfaces 43a of the limiting members 43 abut each other. And the load more than that is the load transmitting members 14e, 15e
In addition, the limiting member 43 responds to the amount exceeding the maximum measurement load, and only the maximum measurement load is applied to the flexible portions 17e and 18e. In this way, since no load greater than the maximum measurement load is applied to the flexible part, they are unlikely to be mechanically or magnetically modified, and therefore stable operation can be performed for a long period of time with good accuracy. It can be held stably. In addition, for the parts which are functionally the same as or equivalent to those in the previous figure and are considered to be redundant, the same reference numerals as those in the previous figure are appended with the letter e, and the redundant description is omitted.
【００２４】[0024]
【発明の効果】以上のように本願発明にあっては、二つ
の溶接電極８，９から検出コア11の二つの可撓部17，18
に加圧力を加えると、それらの可撓部17，18が上記加圧
力に応じて内方向に変形して検出コア11の透磁率が変化
し、検出コイル13がその透磁率の変化を検出するので、
検出コイル13からの検出信号によって電気的に上記加圧
力を測定できる効果がある。しかも上記測定の場合、上
記加圧力が過大であったときには、上記二つの可撓部1
7，18の内方向への変形が、それらの間にある制限部材3
2によって両可撓部の弾性限度内に制限される。この為
上記加圧力を除去すれば検出コア11の可撓部17，18は必
然的に初期状態に復元する特長がある。このことは上記
過大な加圧力の印加に対しても破損を生じ難いことであ
り、高い耐久性を発揮させられる効果がある。更に本願
発明の加圧力測定装置にあっては、検出コア11の可撓部
17，18への荷重を除去すれば、検出コア11は初期の状態
に復元してその透磁率が初期の値に戻る。従って検出コ
イル13からは一定の出力（無荷重出力）を生じさせるこ
とが出来る。又、可撓部17，18に過大な荷重を加えれ
ば、それらは制限部材32によって制限される一定の変形
状態まで変形して検出コア11の透磁率はそれに対応した
一定の値まで変化する。従って検出コイル13からは加え
る過大な荷重の大きさによらず一定となる出力（最大荷
重出力）を生じさせることが出来る。このように無荷重
出力及び最大荷重出力を簡便に出力させることが出来る
ので、例えば検出コイル13からの検出信号を利用する表
示回路の校正を、それらの信号を用いて簡便に行うこと
を可能に出来る効果がある。As described above, according to the present invention, the two welding electrodes 8 and 9 to the two flexible portions 17 and 18 of the detection core 11 are provided.
When a pressing force is applied to the flexible parts 17 and 18 are deformed inward according to the pressing force, the magnetic permeability of the detection core 11 changes, and the detection coil 13 detects the change in the magnetic permeability. So
There is an effect that the pressing force can be electrically measured by the detection signal from the detection coil 13. Moreover, in the above measurement, when the applied pressure is excessive, the two flexible parts 1
The inward deformation of 7, 18 is limited by the limiting member 3 between them.
It is limited by the elastic limit of both flexible parts by 2. For this reason, the flexible portions 17 and 18 of the detection core 11 are inevitably restored to the initial state if the above pressing force is removed. This means that damage is unlikely to occur even when the above-mentioned excessive pressure is applied, and has an effect of exhibiting high durability. Further, in the pressing force measuring device of the present invention, the flexible portion of the detection core 11
When the load on 17 and 18 is removed, the detection core 11 returns to its initial state and its magnetic permeability returns to the initial value. Therefore, a constant output (no load output) can be generated from the detection coil 13. Further, if an excessive load is applied to the flexible portions 17 and 18, they are deformed to a certain deformed state limited by the limiting member 32, and the magnetic permeability of the detection core 11 changes to a certain corresponding value. Therefore, a constant output (maximum load output) can be generated from the detection coil 13 regardless of the magnitude of the excessive load applied. Since it is possible to easily output the no-load output and the maximum load output in this manner, it is possible to easily perform the calibration of the display circuit using the detection signal from the detection coil 13 using those signals, for example. There is an effect that can be done.
【図１】加圧力測定装置の正面図。FIG. 1 is a front view of a pressing force measuring device.
【図２】検出器の縦断面図。FIG. 2 is a vertical sectional view of a detector.
【図３】図２におけるIII−III線断面図。FIG. 3 is a sectional view taken along line III-III in FIG. 2;
【図４】検出コアの斜視図。FIG. 4 is a perspective view of a detection core.
【図５】表示具の回路構成を示す図。FIG. 5 is a diagram showing a circuit configuration of a display tool.
【図６】検出器から最大荷重出力を出力させる手段の一
例を示す断面図。FIG. 6 is a cross-sectional view showing an example of means for outputting a maximum load output from a detector.
【図７】荷重と検出信号との関係の一例を示すグラフ。FIG. 7 is a graph showing an example of a relationship between a load and a detection signal.
【図８】検出器における制限部材の異なる実施形態を示
す一部破断図。FIG. 8 is a partially cutaway view showing a different embodiment of the limiting member in the detector.
【図９】図８の検出器に最大測定荷重が加わっている状
態を示す一部破断図。9 is a partially cutaway view showing a state where the maximum measurement load is applied to the detector of FIG.
８，９ 溶接電極 11 検出コア 13 検出コイル 17，18 可撓部 32 制限部材 8, 9 Welding electrode 11 Detection core 13 Detection coil 17, 18 Flexible part 32 Restriction member
Claims (1)
に二つの可撓部を有していて、相対向する二つの溶接電
極から上記両可撓部に加わる荷重により可撓部が内方向
に変形することによって透磁率が変化するようにしてあ
り、上記検出コアには、検出コアの透磁率の変化を検出
して対応検出信号を出力する検出コイルを付設している
溶接電極の加圧力測定装置において、上記二つの可撓部
の間に、溶接電極からの荷重による可撓部の内方向への
変形をその弾性限度内に制限する為の制限部材を備えさ
せたことを特徴とする溶接電極の加圧力測定装置。1. The detection core has two flexible portions at positions facing each other with a gap therebetween, and the flexible portions are internally moved by a load applied to the both flexible portions from two welding electrodes facing each other. The magnetic permeability is changed by the deformation in the direction, and the above-mentioned detection core is provided with a welding electrode provided with a detection coil for detecting a change in the magnetic permeability of the detection core and outputting a corresponding detection signal. In the pressure measuring device, between the two flexible portions, a limiting member for limiting the inward deformation of the flexible portion due to the load from the welding electrode to the elastic limit thereof is provided. Welding electrode pressure measuring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05834696A JP3709005B2 (en) | 1996-02-20 | 1996-02-20 | Welding electrode pressure measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05834696A JP3709005B2 (en) | 1996-02-20 | 1996-02-20 | Welding electrode pressure measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09225649A true JPH09225649A (en) | 1997-09-02 |
| JP3709005B2 JP3709005B2 (en) | 2005-10-19 |
Family
ID=13081770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05834696A Expired - Lifetime JP3709005B2 (en) | 1996-02-20 | 1996-02-20 | Welding electrode pressure measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3709005B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005315891A (en) * | 2004-04-28 | 2005-11-10 | Senstronic Deutschland Gmbh | Optical measuring instrument |
| JP2012139725A (en) * | 2010-12-17 | 2012-07-26 | Toho Technology Corp | Spot welding automatic inspection device |
| KR101457468B1 (en) * | 2012-12-17 | 2014-11-04 | 주식회사 성우하이텍 | Jig for measuring pressure |
| KR101481373B1 (en) * | 2014-10-17 | 2015-01-14 | 이주영 | Alignment Inspection Apparatus for Tip of Spot Welding Gun |
-
1996
- 1996-02-20 JP JP05834696A patent/JP3709005B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005315891A (en) * | 2004-04-28 | 2005-11-10 | Senstronic Deutschland Gmbh | Optical measuring instrument |
| JP2012139725A (en) * | 2010-12-17 | 2012-07-26 | Toho Technology Corp | Spot welding automatic inspection device |
| KR101457468B1 (en) * | 2012-12-17 | 2014-11-04 | 주식회사 성우하이텍 | Jig for measuring pressure |
| KR101481373B1 (en) * | 2014-10-17 | 2015-01-14 | 이주영 | Alignment Inspection Apparatus for Tip of Spot Welding Gun |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3709005B2 (en) | 2005-10-19 |
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