JPH08110208A - Controller for free length of nc coil spring maker - Google Patents
Controller for free length of nc coil spring makerInfo
- Publication number
- JPH08110208A JPH08110208A JP6270263A JP27026394A JPH08110208A JP H08110208 A JPH08110208 A JP H08110208A JP 6270263 A JP6270263 A JP 6270263A JP 27026394 A JP27026394 A JP 27026394A JP H08110208 A JPH08110208 A JP H08110208A
- Authority
- JP
- Japan
- Prior art keywords
- coil spring
- value
- length
- pitch
- reference value
- 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
- Image Analysis (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Image Processing (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はＮＣコイルばね製造機の
自由長管理装置に関するもので、詳しくは連続成形加工
中の切断直前のコイルばねの先端が遮るスクリーン上の
光線像の長さを一次元ＣＣＤカメラにより測定して、直
ちに良否の選別を行うとともに、次のばね成形時にピッ
チ補正を行う自由長管理装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a free length control device for an NC coil spring manufacturing machine. More specifically, the length of the light beam image on the screen which is blocked by the tip of the coil spring immediately before cutting during continuous molding is firstly determined. The present invention relates to a free length control device that measures the quality by an original CCD camera, immediately determines whether the quality is good, and corrects the pitch at the time of the next spring molding.
【０００２】[0002]
【従来の技術】従来、この種のコイルばね製造機におい
てコイルばねを成形する場合、常に同じ寸法のコイルば
ねが製造されるとは限らない。これは主として線材の材
質むらや、その断面形状（直径等）の不均一等の線材特
性、及び成形時の時間経過による温度変化に起因する。
このうち線材特性は線材ロットの相違は勿論、１ロット
中においても微妙に変化しているのが普通で、線材その
ものの弾性力が常に変化することになる。このように弾
性力が変化する線材をコイルばねに形成する場合、弾性
力の変化により元に戻ろうとする力が刻々と変化すれ
ば、常に一定寸法のコイルばねを製造することは困難で
ある。そこで良品率を高めるために開発されたものに、
特開昭６４−２７５２号に開示された先行技術がある。2. Description of the Related Art Conventionally, when forming a coil spring in a coil spring manufacturing machine of this type, a coil spring having the same size is not always manufactured. This is mainly due to the unevenness of the material of the wire material, the characteristics of the wire material such as the non-uniformity of its cross-sectional shape (diameter, etc.), and the temperature change over time during molding.
Of these, the characteristics of the wire material usually vary slightly not only in the lots of wire material but also in one lot, and the elastic force of the wire material always changes. In the case of forming a wire rod whose elastic force changes in this way on a coil spring, it is difficult to always manufacture a coil spring of a constant size if the force to return to the original changes momentarily due to the change of elastic force. Therefore, in order to improve the rate of non-defective products,
There is a prior art disclosed in Japanese Patent Laid-Open No. 64-2752.
【０００３】このものは図６に示すように線材を送り出
す手段１０１と、線材を当接させて強制的に曲げるコイ
リングツール１０２と、このコイリングツール１０２に
より曲げ癖の付けられた線材に対して、その曲げられた
面に対してほぼ直線方向に往復しながらコイルピッチを
形成する押し出し手段１０３と、コイルばね一個分の線
材送り出しに同期して線材を切断する手段１０４と、コ
イルばね一個分の線材を送り出すことで製造されたコイ
ルばねの自由長を検出する検長器（静電容量式検出器）
１０５からなるばね製造機において、ばね製造に係る自
由長制御量を調整するごとに、サンプリング手段で複数
個のばねを製造し、解析手段で最適な制御量を求めるこ
とにより最良の良品率でコイルばねを製造しようとする
ものである。As shown in FIG. 6, this is a means 101 for feeding a wire rod, a coiling tool 102 for abutting the wire rod to forcibly bend it, and a wire rod having a bending tendency by the coiling tool 102. Extruding means 103 for forming a coil pitch while reciprocating substantially linearly with respect to the curved surface, means 104 for cutting the wire rod in synchronization with the feeding of the wire rod for one coil spring, and wire rod for one coil spring Detector that detects the free length of the coil spring manufactured by sending out (capacitance type detector)
In the spring manufacturing machine consisting of 105, a plurality of springs are manufactured by the sampling means every time the free length control amount related to the spring manufacturing is adjusted, and the optimum control amount is obtained by the analysis means to obtain the coil with the best yield rate. It is intended to manufacture springs.
【０００４】[0004]
【発明が解決しようとする課題】従来の技術で述べた特
開昭６４−２７５２号の技術は、静電容量式の検出器を
使用しているため、ヘッド部（センサチップ）１０５ａ
に成形粉等のごみが付着すると感度低下や測定誤差が生
じやすいという問題を有している。また、ヘッド部１０
５ａの配設位置が、切断されたコイルばねの排出方向前
面に位置しているため、コイルばねとヘッド部１５ａと
が当接し、特に大形ばねにおいて、サンサ部であるヘッ
ド１０５ａが振動して測定信号差を生じたり、ヘッド１
０５ａに損傷が生じ易いなどの問題があった。Since the technique of Japanese Patent Laid-Open No. 64-2752 described in the prior art uses a capacitance type detector, the head portion (sensor chip) 105a is used.
If dust such as molding powder adheres to the, the sensitivity and the measurement error tend to decrease. In addition, the head unit 10
Since the arrangement position of 5a is located on the front surface in the discharge direction of the cut coil spring, the coil spring and the head portion 15a come into contact with each other, and particularly in a large spring, the head 105a which is the sensor portion vibrates. Measurement signal difference or head 1
There was a problem that 05a was easily damaged.
【０００５】本発明は従来の技術の有するこのような問
題点に鑑みなされたものであり、その目的とするところ
は、成形した切断直前のコイルばねの先端部で遮ること
により短くなるスクリーン上の光線像の長さを、スクリ
ーンに焦点を合わせた測長センサを内蔵するカメラによ
り計測することで、焦点ずれによるぼけや、切断された
コイルばねによって計測部材に振動や損傷が生じない、
また、コイルばね成形時の成形粉等ごみによる感度低下
等の測定精度への悪影響の出ない正確な計測により、製
品の良否の判別とピッチ補正を連続的に行うことのでき
る自由長管理装置を提供しようとするものである。The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to shorten the length of the screen by blocking the tip of the coil spring immediately before cutting. By measuring the length of the light beam image with a camera that has a built-in length measurement sensor that focuses on the screen, blurring due to defocusing and vibration and damage to the measurement member due to the cut coil spring do not occur.
In addition, a free length management device that can continuously determine product quality and pitch correction by accurate measurement that does not adversely affect measurement accuracy such as sensitivity deterioration due to dust such as molding powder during coil spring molding It is the one we are trying to provide.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に本発明におけるＮＣコイルばね製造機の自由長管理装
置は、少なくともコイルばねの自由長を制御するピッチ
調整機構を有するＮＣコイルばね製造機において、前記
ＮＣコイルばね製造機のばね成形位置を挟んで一方にば
ね成形方向と直角に測長センサを内蔵するカメラ及び投
光器と他方にスクリーンとを備え前記投光器より投光さ
れ前記スクリーン上に一線状で所定長に映される光線像
に対しばね成形方向の光線像の長さを計測する手段と、
ほぼ設計値通りの自由長さに成形された切断直前のコイ
ルばねの先端部が遮った前記スクリーン上の残りの光線
像の長さを前記カメラにより計測して基準値として設定
しその値を記憶する手段と、連続成形加工中の切断直前
のコイルばねの先端部が遮った光線像の前記カメラによ
る計測値と前記基準値とを比較して誤差を求める手段
と、求めた誤差よりピッチ補正量を求めて前記ピッチ調
整機構のピッチツールの前進位置の補正を行う手段とを
設けてなるものである。In order to achieve the above object, a free length management device for an NC coil spring manufacturing machine according to the present invention has an NC coil spring manufacturing machine having at least a pitch adjusting mechanism for controlling the free length of the coil spring. In the NC coil spring manufacturing machine, a camera and a light projector having a built-in length-measuring sensor is provided on one side of the NC coil spring manufacturing machine at a right angle to the spring molding direction, and a screen is provided on the other side of the NC coil spring manufacturing machine. A means for measuring the length of the light beam image in the spring forming direction with respect to the light beam image projected in a predetermined length,
The length of the remaining ray image on the screen, which was blocked by the tip of the coil spring just before cutting and was molded into a free length almost as designed, was measured by the camera and set as a reference value, and that value was stored. And a means for obtaining an error by comparing the measured value by the camera of the light beam image interrupted by the tip of the coil spring immediately before cutting during continuous molding and the reference value, and a pitch correction amount based on the obtained error. And means for correcting the forward movement position of the pitch tool of the pitch adjusting mechanism.
【０００７】また基準値に対してプラス側及び又はマイ
ナス側に許容値を設定して記憶する手段と、誤差と許容
値とを比較して良否を判別する手段とを設けてなるもの
である。Further, there are provided means for setting and storing allowable values on the plus side and / or the minus side with respect to the reference value, and means for comparing the error and the allowable value to determine pass / fail.
【０００８】[0008]
【作用】連続成形加工に先立って、ほぼ設計値通りの自
由長が得られた時点の切断直前のコイルばねの先端部が
遮るスクリーン上の光線像の長さを測長センサ内蔵のカ
メラで計測し、このときの計測値を基準値として記憶す
る。[Function] Prior to continuous molding, the length of the light beam image on the screen interrupted by the tip of the coil spring just before cutting when the free length almost equal to the designed value is obtained is measured with a camera with a length measuring sensor. Then, the measured value at this time is stored as a reference value.
【０００９】連続成形加工に入り、線材が所定長送られ
てコイル成形が終わり、切断の直前にＮＣ装置より計測
指令が出て、スクリーン上の光線像の長さが検出され
る。そしてこの検出された計測値と、記憶されている基
準値とを比較して誤差を求め、求めた誤差によりピッチ
補正値を算出して、次の成形時にピッチツールの前進位
置を補正して設計値通りの自由長が得られるようにす
る。In the continuous forming process, the wire is fed for a predetermined length to finish the coil forming. Immediately before cutting, a measuring command is issued from the NC device to detect the length of the light beam image on the screen. Then, the detected measurement value is compared with the stored reference value to obtain an error, the pitch correction value is calculated from the obtained error, and the forward position of the pitch tool is corrected at the time of the next molding to design. Make sure you get the free length you deserve.
【００１０】また、連続成形加工に先立って基準値に対
してプラス側及び又はマイナス側の許容値を外部より入
力して記憶し、誤差と許容値とを比較して良否の判別信
号で選別機のシャッタを開閉して良品と不良品とを選別
する。上述のカメラによる計測は、成形中のコイルばね
の先端部をカメラで写すのでなく、所定距離はなれたス
クリーン上の光線像を計測するものであり、コイルばね
の位置変化などで焦点（ピント）が甘くなることがなく
常に正確に計測できる。Further, prior to the continuous molding process, the plus side and / or the minus side allowance value with respect to the reference value is inputted and stored from the outside, and the error and the allowance value are compared, and a sorting machine is issued by a pass / fail judgment signal. The shutter is opened and closed to select good products from defective products. The above-mentioned measurement by the camera does not capture the tip of the coil spring during molding by the camera, but measures the light beam image on the screen at a predetermined distance, and the focus changes due to the position change of the coil spring. You can always measure accurately without becoming sweet.
【００１１】[0011]
【実施例】以下本発明の実施例について図面を参照して
説明する。図１，図２はＮＣコイルばね製造機の概略構
成図であって、１は線材Ｗを送り出すフィードローラ
で、一対で線材Ｗを挟持して図示しない駆動モータによ
り線材を前方（右側）へ送り出すようになっている。２
Ｆ，２Ｓはコイリングツールで、線ガイド３を貫通して
送り出される線材Ｗと衝合させて所定の曲率のコイルに
ピッチを与えるもので、ＮＣ制御のピッチ用モータ８
（図４）の正逆転により溝カム９（図は簡素化のため外
周カムとして表示する）を介して矢印の方向に往復運動
させることにより、両端が密着し中間に所望のばねピッ
チを成形する。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are schematic configuration diagrams of an NC coil spring manufacturing machine. Reference numeral 1 is a feed roller for feeding a wire rod W, and nipping a pair of wire rods W and feeding the wire rod forward (right side) by a drive motor (not shown). It is like this. Two
F and 2S are coiling tools, which collide with the wire material W that is sent out through the wire guide 3 to give a pitch to a coil having a predetermined curvature. The NC control pitch motor 8 is used.
By making a reciprocating motion in the direction of the arrow through the groove cam 9 (illustrated as an outer peripheral cam for simplification) by forward and reverse rotation of (FIG. 4), both ends are in close contact and a desired spring pitch is formed in the middle. .
【００１２】１１はカッタで、芯金１０との協働で線材
Ｗを切断するものであり、ＮＣ制御のカッタ用モータ１
２（図４）の一方向回転により溝カム１３を介して矢印
にて示す方向に移動可能とされている。１５はセンサヘ
ッドで図５に示すように設定距離はなれたスクリーン１
８上に焦点を合わせたＣＣＤカメラ１４（図４）と、ス
クリーン１８上に一線状のばね成形方向の所定長Ｌ１の
光線像を作る図示しない投光器とを内蔵している。Reference numeral 11 denotes a cutter, which cuts the wire W in cooperation with the core metal 10, and is a cutter motor 1 for NC control.
2 (FIG. 4) can be moved in the direction indicated by the arrow via the grooved cam 13 by unidirectional rotation. A sensor head 15 is a screen 1 with a set distance as shown in FIG.
8 has a built-in CCD camera 14 (FIG. 4) focused on it, and a projector (not shown) for forming a light beam image of a predetermined length L1 on the screen 18 in a linear spring forming direction.
【００１３】この投光器の光源には赤外ＬＥＤが使用さ
れ、ＣＣＤカメラ１４で所定長Ｌ１の光線像を測長セン
サ上に結像し、数千ビットのＣＣＤ画素数に分解してそ
の数値を出力するもので、例えば所定長Ｌ１（測定範
囲）が２５ｍｍで、ビット数が２５００の場合、１ビッ
トが０．０１ｍｍとなる。このセンサヘッド１５は例え
ば株式会社キーエンスのＶＬシリーズ等市販のものを使
用することができる。An infrared LED is used as a light source of this projector, and a CCD camera 14 forms an image of a light beam having a predetermined length L1 on a length measuring sensor, decomposes it into CCD pixel numbers of several thousand bits, and calculates the numerical value. For example, when the predetermined length L1 (measurement range) is 25 mm and the number of bits is 2500, one bit is 0.01 mm. As the sensor head 15, for example, a commercially available one such as VL series manufactured by Keyence Corporation can be used.
【００１４】センサヘッド１５とスクリーン１８は連結
具１６により互いに設定距離Ｌ２を有して連結され、成
形されたコイルばねＳの先端部Ｓａが、図示しない投光
器からの光を遮ってスクリーン１８上の光線像が短くな
るようばね成形位置を挟んで支持具１７によりフレーム
２０に位置調整可能に取着されている。The sensor head 15 and the screen 18 are connected to each other with a set distance L2 by a connecting tool 16, and the tip end Sa of the coil spring S formed on the screen 18 blocks light from a projector (not shown). It is attached to the frame 20 so that the position of the light beam image can be adjusted by the support 17 with the spring forming position sandwiched therebetween.
【００１５】図４は自由長管理システムのブロック線図
とＮＣコイルばね製造機要部の概略構成図である。１９
は選別器で、シャッタ２１はソレノイド２３により回動
するが、ソレノイド２３の駆動信号がゼロの場合に、図
示しないばねの作用により垂直位置にある。２４は光源
供給部でセンサヘッド１５の投光器用の電源、２５は測
定信号出力部でコイルばね成形が所定長に達し、線材送
りが停止してから切断が開始されるまでの瞬間のＣＣＤ
カメラ１４からの信号を読み取り、ＮＣ装置３０の入力
信号として使用できるまで増幅して出力する部分、２６
はＣＲＴである。FIG. 4 is a block diagram of the free length management system and a schematic configuration diagram of the main part of the NC coil spring manufacturing machine. 19
Is a selector, and the shutter 21 is rotated by a solenoid 23, but is in a vertical position by the action of a spring (not shown) when the drive signal of the solenoid 23 is zero. Reference numeral 24 is a light source supply unit, which is a power source for the projector of the sensor head 15, and 25 is a measurement signal output unit, which is the CCD at the moment when the coil spring forming reaches a predetermined length and the wire feed is stopped until the cutting is started.
A portion for reading a signal from the camera 14 and amplifying and outputting the signal until it can be used as an input signal of the NC device 30,
Is a CRT.
【００１６】図中一点鎖線で囲んだ部分はＮＣ装置３０
の自由長管理システムに係わる部分である。プログラム
記憶部３１は、テープ又はフロッピー或いはＭＤＩより
入力されるプログラムを記憶する部分。プログラム解析
部３２は、プログラムを解析して必要信号を必要個所に
仕分ける部分。カッタ用モータ制御部３３は、カッタ用
モータ１２を指令値通りに駆動するための制御部分。パ
ワー出力部３４は、カッタ用モータ１２に駆動電力を供
給する部分。ピッチ用モータ制御部３５は、ピッチ用モ
ータ８を指令値通りに駆動するための制御部分。パワー
出力部３６は、ピッチ用モータ８に駆動電力を供給する
部分である。In the figure, the portion surrounded by the alternate long and short dash line is the NC device 30.
This is the part related to the free length management system. The program storage section 31 is a section for storing a program input from a tape, a floppy disk, or an MDI. The program analysis unit 32 is a part that analyzes a program and sorts necessary signals into necessary parts. The cutter motor control unit 33 is a control unit for driving the cutter motor 12 according to the command value. The power output unit 34 is a portion that supplies drive power to the cutter motor 12. The pitch motor control unit 35 is a control unit for driving the pitch motor 8 according to the command value. The power output section 36 is a section that supplies drive power to the pitch motor 8.
【００１７】基準値記憶部３７は、ほぼ設計値通りの長
さに成形された基準ばねＳの計測値を、キーボード等Ｍ
ＤＩによる外部からの登録指令で基準値として記憶する
部分。許容値記憶部３８は、ＭＤＩ等外部から入力され
た基準値前後の許容値を記憶する部分である。誤差算出
部３９は、コイルばねの成形が１回行われるたびに測定
信号出力部２５より送られてくる計測値と、基準値記憶
部３７に記憶されている基準値とを比較して誤差を算出
する部分。The reference value storage unit 37 stores the measured value of the reference spring S, which is formed to have a length almost according to the design value, as a keyboard M
A part that is stored as a reference value by an external registration command by DI. The permissible value storage unit 38 is a unit for storing permissible values around the reference value input from the outside such as MDI. The error calculation unit 39 compares the measurement value sent from the measurement signal output unit 25 each time the coil spring is formed once with the reference value stored in the reference value storage unit 37 to calculate the error. The part to calculate.
【００１８】良否判定部４０は、誤差と許容値とを比較
して良否を判定する部分。選別器制御部４１は、良否判
定部４０からの不良信号で選別器１９のソレノイド２３
に電圧を供給してシャッタ２１を回動する部分。ピッチ
補正値算出部４２は、測定値と基準値との誤差からピッ
チツール位置の補正値を算出する部分。補正値更新記憶
部４３は、コイルばね成形１回ごとに送られてくる新し
い補正値に更新しつつ記憶する部分。画像処理部４４
は、連続成形加工中の誤差の変化及びばらつき寸法別の
累積個数等の管理データをＣＲＴ２６に表示するための
処理部分である。The pass / fail judgment unit 40 is a unit for judging pass / fail by comparing an error with an allowable value. The selector control unit 41 uses the defective signal from the pass / fail judgment unit 40 to determine the solenoid 23 of the selector 19.
The part that supplies a voltage to the shutter 21 to rotate the shutter 21. The pitch correction value calculation unit 42 is a portion that calculates a correction value for the pitch tool position from the error between the measured value and the reference value. The correction value update storage unit 43 is a unit for updating and storing a new correction value sent every time the coil spring is formed. Image processing unit 44
Is a processing portion for displaying on the CRT 26 management data such as a change in error during continuous molding and a cumulative number for each variation dimension.
【００１９】続いて本発明の実施例の作用を説明する。
コイルばねの連続成形加工に先立って、ＭＤＩ又はパル
スジェネレータからの手動入力でコイリングツール２
Ｆ，２Ｓ及びピッチツール７の位置を調節して、ほぼ設
計値通りの基準ばねＳができるようになった時点で、カ
ッタ１１による線材Ｗ切断直前の状態で機械を一時停止
させる。そしてセンサヘッド１５内蔵のＣＣＤカメラ１
４によるスクリーン１８上の基準ばねＳにより遮られて
後部が欠落した光線像の長さを検出してＮＣ装置３０の
基準値記憶部３７に基準値として記憶させ、更に基準値
前後の許容値をＭＤＩにより手動入力して許容値記憶部
３８に記憶させる。Next, the operation of the embodiment of the present invention will be described.
Prior to the continuous forming process of the coil spring, the coiling tool 2 is manually input from the MDI or the pulse generator.
When the positions of F, 2S and the pitch tool 7 are adjusted and the reference spring S that is almost the designed value can be formed, the machine is temporarily stopped immediately before the cutting of the wire W by the cutter 11. And a CCD camera 1 with a built-in sensor head 15
4 detects the length of the light image which is blocked by the reference spring S on the screen 18 and whose rear part is missing, and stores it as a reference value in the reference value storage unit 37 of the NC device 30. It is manually input by the MDI and stored in the allowable value storage unit 38.
【００２０】以上の設定手順を経て連続成形に入り、カ
ッタ１１による切断の直前にプログラム解析部３２より
計測指令が出て、ＣＣＤカメラ１４により計測値が読み
取られ、測定信号出力部２５より計測値がＮＣ装置３０
に出力される。ＮＣ装置３０では誤差算出部３９で、基
準値記憶部３７に記憶されている基準値とこの計測値と
を比較して誤差を求め、求めた誤差を良否判定部４０に
送る。ここで許容値記憶部３８に記憶されている許容値
と誤差とを比較して選別器制御部４１に信号を送る。選
別器制御部４７からの不良信号で選別器１９のソレノイ
ド２３に通電してシャッタ２１を回動して選別器のポー
トを切り換え、求めた誤差を同時にピッチ補正値算出部
４２にも送り、ここでピッチツール７の前進位置の補正
値が求められて、補正値更新記憶部４３に送られ、新し
い補正値に更新して記憶され次のコイルばねの成形時に
新しい補正値によりピッチ補正が行われる。Through the above setting procedure, the continuous molding is started, the measurement command is issued from the program analysis section 32 immediately before the cutting by the cutter 11, the measured value is read by the CCD camera 14, and the measured value is output from the measurement signal output section 25. Is the NC device 30
Is output to In the NC device 30, the error calculation unit 39 compares the reference value stored in the reference value storage unit 37 with the measured value to obtain the error, and sends the obtained error to the pass / fail judgment unit 40. Here, the allowable value stored in the allowable value storage unit 38 is compared with the error and a signal is sent to the selector control unit 41. In response to a defective signal from the selector control unit 47, the solenoid 23 of the selector 19 is energized to rotate the shutter 21 to switch the port of the selector, and the obtained error is also sent to the pitch correction value calculation unit 42 at the same time. The correction value of the forward position of the pitch tool 7 is obtained at, and it is sent to the correction value update storage unit 43, updated to a new correction value and stored, and pitch correction is performed by the new correction value when the next coil spring is formed. .
【００２１】従って計測されたコイルばねの自由長が設
計値より短い場合には次の成形加工時にピッチツール７
の前進位置がプラス補正されて対応する所定量だけ前進
し、長い場合にはピッチツール７の前進位置がマイナス
補正されて対応する所定量だけ後退して、自由長を設計
値に近づける。こうして連続的に計測が行われるたびに
その誤差が算出されてメモリに記憶され、ＭＤＩより表
示指令を入力させると、例えば誤差の変化を折れ線グラ
フで、ばらつき寸法別の累積個数を棒グラフでそれぞれ
ＣＲＴに表示することができる。Therefore, when the measured free length of the coil spring is shorter than the design value, the pitch tool 7 is used in the next forming process.
Of the pitch tool 7 is positively corrected and moved forward by a corresponding predetermined amount, and when it is long, the forward position of the pitch tool 7 is negatively corrected and moved backward by a corresponding predetermined amount to bring the free length close to the design value. In this way, the error is calculated each time the measurement is continuously performed and stored in the memory, and when a display command is input from the MDI, for example, a change in the error is displayed in a line graph, and the cumulative number for each variation dimension is displayed in a CRT. Can be displayed.
【００２２】[0022]
【発明の効果】本発明は上述のとおり構成されているの
で次に記載する効果を奏する。ばね成形位置の両側の離
れた位置にカメラとスクリーンとを設け、カメラ近傍の
投光器より投光されスクリーン上に一線状に映されるば
ね成形方向の光線像をコイルばね先端部が遮ったときの
光線像の長さを、測長センサを内蔵するカメラで計測す
るようにし、連続成形加工に先立って予め基準ばねを計
測したときの基準値と、連続成形中の測定値とを比較し
て誤差を求めてピッチ補正を行うようにしたので、カメ
ラのピントをスクリーン上に合わせておけば、レンズの
投光軸方向のコイルばねの位置変化などに関係なく常に
鮮明な画像が得られ、ピント合わせなどの難しい調整の
必要がなく、計測部材に振動や損傷が生じない、また、
成形粉等の汚れに影響されない正確な測定値を常時検出
することができ、更に、測定器の取付スペースに制約が
ない、簡素で扱いやすい自由長管理装置となる。Since the present invention is configured as described above, it has the following effects. A camera and a screen are provided at positions apart from each other on both sides of the spring forming position, and when the tip of the coil spring interrupts the light beam image in the spring forming direction which is projected from the projector near the camera and is linearly projected on the screen. The length of the light beam image is measured with a camera that has a built-in length measurement sensor, and the reference value when the reference spring is measured in advance prior to continuous molding processing is compared with the measured value during continuous molding to make an error. Since the pitch is corrected in order to determine the focus, if the camera is focused on the screen, a clear image will always be obtained regardless of the position change of the coil spring in the projection axis direction of the lens, etc. There is no need for difficult adjustments such as vibration and damage to the measuring members, and
It is a simple and easy-to-use free length control device that can always detect an accurate measured value that is not affected by stains such as molding powder, and that has no restrictions on the installation space for measuring instruments.
【００２３】また、予め基準値に対してプラス側及び又
はマイナス側に許容値を設けて、この許容値と誤差を比
較して製品の良否の判別を行うようにしたので、ピッチ
補正と同時に良品と不良品の選別を行うことが可能とな
る。Further, since the allowable values are set in advance on the plus side and / or the minus side with respect to the reference value and the error is compared with the allowable value to judge the quality of the product, the quality of the product is corrected simultaneously with the pitch correction. It is possible to sort out defective products.
【図１】本発明の実施例のばね製造機の正面図である。FIG. 1 is a front view of a spring manufacturing machine according to an embodiment of the present invention.
【図２】図１のＡ−Ａ線視図である。FIG. 2 is a view taken along the line AA of FIG.
【図３】ピッチツールによるピッチ成形の状態を表す図
である。FIG. 3 is a diagram showing a state of pitch forming by a pitch tool.
【図４】自由長管理システムのブロック線図である。FIG. 4 is a block diagram of a free length management system.
【図５】ＣＣＤカメラと投光器を内蔵するセンサヘッド
とスクリーンの斜視図である。FIG. 5 is a perspective view of a sensor head including a CCD camera and a light projector, and a screen.
【図６】従来の技術のばね製造装置の斜視図である。FIG. 6 is a perspective view of a conventional spring manufacturing apparatus.
１ フィードローラ ７ ピッチツール ８ ピッチ用モータ １１ カッタ １２ カッタ用モータ １４ ＣＣＤカメラ １５ センサヘッド １８ スクリーン １９ 選別器 ３０ ＮＣ装置 ３７ 基準値記憶部 ３８ 許容値記憶部 ３９ 誤差算出部 ４０ 良否判定部 ４１ 選別器制御部 1 Feed Roller 7 Pitch Tool 8 Pitch Motor 11 Cutter 12 Cutter Motor 14 CCD Camera 15 Sensor Head 18 Screen 19 Sorter 30 NC Device 37 Reference Value Storage Unit 38 Allowable Value Storage Unit 39 Error Calculation Unit 40 Pass / Fail Judgment Unit 41 Sorting Control unit
Claims (2)
るピッチ調整機構を有するＮＣコイルばね製造機におい
て、前記ＮＣコイルばね製造機のばね成形位置を挟んで
一方にばね成形方向と直角に測長センサを内蔵するカメ
ラ及び投光器と他方にスクリーンとを備え前記投光器よ
り投光され前記スクリーン上に一線状で所定長に映され
る光線像に対しばね成形方向の光線像の長さを計測する
手段と、ほぼ設計値通りの自由長さに成形された切断直
前のコイルばねの先端部が遮った前記スクリーン上の残
りの光線像の長さを前記カメラにより計測して基準値と
して設定しその値を記憶する手段と、連続成形加工中の
切断直前のコイルばねの先端部が遮った光線像の前記カ
メラによる計測値と前記基準値とを比較して誤差を求め
る手段と、求めた誤差よりピッチ補正量を求めて前記ピ
ッチ調整機構のピッチツールの前進位置の補正を行う手
段とを設けてなることを特徴とするＮＣコイルばね製造
機の自由長管理装置。1. An NC coil spring manufacturing machine having a pitch adjusting mechanism for controlling at least a free length of a coil spring, wherein a length measuring sensor is provided on one side of a spring molding position of the NC coil spring manufacturing machine at right angles to a spring molding direction. A means for measuring the length of the light beam image in the spring forming direction with respect to the light beam image projected from the light projector and projected on the screen in a linear shape with a predetermined length, the camera and the light projector having the built-in , The length of the light beam image remaining on the screen blocked by the tip of the coil spring just before cutting formed into a free length almost as designed value is measured by the camera and set as a reference value. Means for storing, means for obtaining an error by comparing the value measured by the camera with the reference value of the light beam image interrupted by the tip of the coil spring immediately before cutting during continuous molding processing, and the obtained error A means for correcting the forward position of the pitch tool of the pitch adjusting mechanism by obtaining a pitch correction amount from the difference, and a free length control device for an NC coil spring manufacturing machine.
側に許容値を設定して記憶する手段と、誤差と許容値と
を比較して良否を判別する手段とを設けてなることを特
徴とする請求項１記載のＮＣコイルばね製造機の自由長
管理装置。2. A means for setting and storing a tolerance value on the plus side and / or a minus side with respect to a reference value, and means for comparing the error and the tolerance value to determine pass / fail. The free length control device for the NC coil spring manufacturing machine according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6270263A JP2978076B2 (en) | 1994-10-07 | 1994-10-07 | Free length control device of NC coil spring manufacturing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6270263A JP2978076B2 (en) | 1994-10-07 | 1994-10-07 | Free length control device of NC coil spring manufacturing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08110208A true JPH08110208A (en) | 1996-04-30 |
| JP2978076B2 JP2978076B2 (en) | 1999-11-15 |
Family
ID=17483821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6270263A Expired - Fee Related JP2978076B2 (en) | 1994-10-07 | 1994-10-07 | Free length control device of NC coil spring manufacturing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2978076B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007212362A (en) * | 2006-02-10 | 2007-08-23 | Asahi-Seiki Mfg Co Ltd | Image processor and spring forming machine |
| CN102233399A (en) * | 2010-04-06 | 2011-11-09 | 瓦菲奥斯股份公司 | Method and apparatus for production of helical springs by spring winding |
| JP2013176797A (en) * | 2012-02-29 | 2013-09-09 | Asahi- Seiki Manufacturing Co Ltd | Coil spring forming device and spring length measuring device |
| JP2019035604A (en) * | 2017-08-10 | 2019-03-07 | 日本発條株式会社 | Coil spring measuring device and coil spring manufacturing apparatus |
| CN112304247A (en) * | 2020-12-24 | 2021-02-02 | 荣旗工业科技(苏州)股份有限公司 | Detection system applying upper and lower coaxial light sources |
| US11618069B2 (en) | 2018-03-20 | 2023-04-04 | Primetals Technologies USA LLC | Automated wire rod trimming station and sample quality evaluation |
-
1994
- 1994-10-07 JP JP6270263A patent/JP2978076B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007212362A (en) * | 2006-02-10 | 2007-08-23 | Asahi-Seiki Mfg Co Ltd | Image processor and spring forming machine |
| CN102233399A (en) * | 2010-04-06 | 2011-11-09 | 瓦菲奥斯股份公司 | Method and apparatus for production of helical springs by spring winding |
| JP2013176797A (en) * | 2012-02-29 | 2013-09-09 | Asahi- Seiki Manufacturing Co Ltd | Coil spring forming device and spring length measuring device |
| JP2019035604A (en) * | 2017-08-10 | 2019-03-07 | 日本発條株式会社 | Coil spring measuring device and coil spring manufacturing apparatus |
| US11618069B2 (en) | 2018-03-20 | 2023-04-04 | Primetals Technologies USA LLC | Automated wire rod trimming station and sample quality evaluation |
| CN112304247A (en) * | 2020-12-24 | 2021-02-02 | 荣旗工业科技(苏州)股份有限公司 | Detection system applying upper and lower coaxial light sources |
| CN112304247B (en) * | 2020-12-24 | 2021-03-26 | 荣旗工业科技(苏州)股份有限公司 | Detection system applying upper and lower coaxial light sources |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2978076B2 (en) | 1999-11-15 |
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