JP2978076B2 - Free length control device of NC coil spring manufacturing machine - Google Patents
Free length control device of NC coil spring manufacturing machineInfo
- Publication number
- JP2978076B2 JP2978076B2 JP6270263A JP27026394A JP2978076B2 JP 2978076 B2 JP2978076 B2 JP 2978076B2 JP 6270263 A JP6270263 A JP 6270263A JP 27026394 A JP27026394 A JP 27026394A JP 2978076 B2 JP2978076 B2 JP 2978076B2
- Authority
- JP
- Japan
- Prior art keywords
- coil spring
- length
- error
- value
- pitch
- 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.)
- Expired - Fee Related
Links
Landscapes
- Image Analysis (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Image Processing (AREA)
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 an apparatus for controlling the free length of an NC coil spring manufacturing machine, and more particularly to a primary length of a ray image on a screen which is interrupted by a tip of a coil spring immediately before cutting during continuous molding. The present invention relates to a free-length managing device that immediately determines pass / fail by measuring with a source CCD camera and performs pitch correction 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 this type of coil spring manufacturing machine, a coil spring having the same dimensions is not always manufactured. This is mainly due to wire material characteristics such as uneven material of the wire material, non-uniformity of the cross-sectional shape (diameter and the like), and temperature change due to elapse of time during molding.
Of these, the wire properties generally vary slightly even within one lot, not to mention the wire lot difference, and the elastic force of the wire itself changes constantly. In the case of forming a wire having a variable elastic force into a coil spring as described above, it is difficult to always manufacture a coil spring having a constant dimension if the force to return to the original state changes every moment due to the change in the elastic force. So what was developed to increase the non-defective rate,
There is a prior art disclosed in Japanese Patent Application 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。[0003] As shown in FIG. 6, a wire material is sent out by a means 101 for feeding a wire material, a coiling tool 102 for forcibly bending the wire material by contacting the wire material, and a wire material having a bending habit by the coiling tool 102. Extruding means 103 for forming a coil pitch while reciprocating in a substantially linear direction with respect to the bent surface, means 104 for cutting a wire in synchronization with feeding of a wire for one coil spring, and wire for one coil spring Detector (capacitance detector) that detects the free length of the coil spring manufactured by sending out
Each time the free length control amount related to the spring production is adjusted, a plurality of springs are manufactured by the sampling means and the optimum control amount is obtained by the analysis means. A spring is to be manufactured.
【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。The technique disclosed in Japanese Unexamined Patent Publication No. 64-2752 described in the prior art uses a capacitance type detector, so that the head (sensor chip) 105a is used.
There is a problem that if dust such as molding powder adheres to the surface, sensitivity is reduced and measurement error is likely to occur. The head unit 10
Since the disposition position of the coil spring 5a is located in front of the cut coil spring in the discharge direction, the coil spring and the head portion 15a are in contact with each other. A measurement signal difference may occur or the head 1
There was a problem that damage was easily caused in 05a.
【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。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to reduce the length of a screen which is shortened by being interrupted by the tip of a formed coil spring immediately before cutting. By measuring the length of the light image using a camera with a built-in length measurement sensor focused on the screen, blurring due to defocus and vibration or damage to the measurement member due to the cut coil spring do not occur.
In addition, a free length management device that can continuously judge the quality of the product and correct the pitch by accurate measurement that does not adversely affect the measurement accuracy such as sensitivity reduction due to dust such as molding powder during coil spring molding. It is something to offer.
【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, an NC coil spring manufacturing machine according to the present invention comprises an NC coil spring manufacturing machine having a pitch adjusting mechanism for controlling at least the free length of the coil spring. , A camera having a built-in length measuring sensor at right angles to the spring forming direction and a screen provided at one side of the spring forming position of the NC coil spring manufacturing machine, and a screen provided at the other side. Means for measuring the length of the ray image in the spring forming direction with respect to the ray image projected to a predetermined length in a shape,
The length of the remaining light image on the screen blocked by the tip of the coil spring immediately before cutting, which is formed to have a free length almost as designed and cut off, is measured by the camera and set as a reference value, and the value is stored. Means for calculating an error by comparing a measured value by the camera of the light image blocked by the tip of the coil spring immediately before cutting during continuous forming processing with the reference value, and a pitch correction amount based on the obtained error. And means for correcting the forward position of the pitch tool of the pitch adjusting mechanism in order to obtain the above.
【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 an allowable value on the plus side and / or on the minus side with respect to the reference value, and means for comparing the error with the allowable value to determine the acceptability.
【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 that is blocked by the tip of the coil spring immediately before cutting when the free length is almost as designed is measured with a camera with a built-in 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 complete the coil forming. Immediately before cutting, a measurement command is issued from the NC device, and the length of the light beam image on the screen is detected. Then, the detected measurement value is compared with the stored reference value to determine an error, a pitch correction value is calculated based on the determined error, and the forward position of the pitch tool is corrected at the time of the next molding to design. Make sure that the free length according to the value is obtained.
【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。Prior to the continuous forming process, a permissible value on the plus side and / or a minus side with respect to the reference value is externally inputted and stored, and the error is compared with the permissible value to determine whether the reference value is acceptable or not. The shutter is opened and closed to select a good product and a defective product. The measurement by the above-mentioned camera measures a light beam image on a screen at a predetermined distance away from the tip of the coil spring being formed by the camera, and the focus (focus) is changed due to a change in the position of the coil spring. You can always measure accurately without getting 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 denotes a feed roller that feeds a wire W. The feed roller 1 sandwiches the wire W in pairs and feeds the wire forward (to the right) by a drive motor (not shown). It has become. 2
F and 2S denote coiling tools which abut a wire W which is fed through the wire guide 3 to give a pitch to a coil having a predetermined curvature.
By reciprocating in the direction of the arrow through the groove cam 9 (the figure is shown as an outer peripheral cam for simplicity) 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 cored bar 10, and which is an NC control cutter motor 1.
2 (FIG. 4) can be moved in the direction indicated by the arrow through the groove cam 13 by one-way rotation. Reference numeral 15 denotes a sensor head, which is a screen 1 separated by a set distance as shown in FIG.
A built-in CCD camera 14 (FIG. 4) focused on 8 and a projector (not shown) for forming a light image of a predetermined length L1 in a linear spring forming direction on a screen 18.
【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 light image having a predetermined length L1 is formed on a length measuring sensor by a CCD camera 14, and the image is decomposed into CCD pixels of several thousand bits and the numerical value is converted. 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, a commercially available sensor head 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 Sa of the formed coil spring S blocks light from a projector (not shown) on the screen 18 It is attached to the frame 20 by the support 17 so as to be able to adjust the position so as to shorten the light image with the spring forming position interposed 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 a free length management system and a schematic configuration diagram of a main part of an NC coil spring manufacturing machine. 19
Is a selector, and the shutter 21 is rotated by the solenoid 23. When the drive signal of the solenoid 23 is zero, the shutter 21 is in the vertical position by the action of a spring (not shown). Reference numeral 24 denotes a light source supply unit, a power supply for the projector of the sensor head 15, and 25 denotes a measurement signal output unit, which is a CCD at the moment when the coil spring forming reaches a predetermined length and the wire feed is stopped and 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, a portion surrounded by a dashed line is the NC device 30.
This is a 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 or an MDI. The program analysis unit 32 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 a command value. The power output unit 34 supplies driving 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 formed to have a length substantially as designed, using a keyboard or the like.
A part that is stored as a reference value by an external registration command by DI. The permissible value storage unit 38 is a part that stores permissible values before and after a reference value input from outside such as MDI. The error calculator 39 compares the measurement value sent from the measurement signal output unit 25 with the reference value stored in the reference value storage unit 37 each time the coil spring is formed once, and calculates 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 judges the pass / fail by comparing the error with an allowable value. The sorter control unit 41 receives the fault signal from the pass / fail determination unit 40 and uses the solenoid 23 of the
For supplying voltage to the shutter and rotating the shutter 21. A section for calculating a correction value of the pitch tool position from an error between the measured value and the reference value. The correction value update storage unit 43 is a unit that stores while updating to a new correction value sent each time the coil spring is formed. Image processing unit 44
Is a processing part for displaying on the CRT 26 management data such as a change in an error during the continuous forming process and a cumulative number for each variation size.
【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 continuous forming of the coil spring, the coiling tool 2 is manually input from an MDI or a pulse generator.
When the positions of the F, 2S and the pitch tool 7 are adjusted, and the reference spring S is almost as designed, the machine is temporarily stopped in a state immediately before the cutting of the wire W by the cutter 11. And the CCD camera 1 with the built-in sensor head 15
4, the length of the light beam image which is interrupted by the reference spring S on the screen 18 and whose rear portion is missing is detected and stored as a reference value in the reference value storage unit 37 of the NC device 30, and the allowable value before and after the reference value is further determined. 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, continuous molding is started. Immediately before cutting by the cutter 11, a measurement command is issued from the program analysis unit 32, the measured value is read by the CCD camera 14, and the measured value is output from the measurement signal output unit 25. Is the NC device 30
Is output to In the NC device 30, the error calculator 39 compares the measured value with the reference value stored in the reference value storage unit 37 to determine an error, and sends the determined error to the pass / fail determination unit 40. Here, the error is compared with the allowable value stored in the allowable value storage unit 38 and a signal is sent to the selector control unit 41. The solenoid 23 of the selector 19 is energized by a failure signal from the selector controller 47 to rotate the shutter 21 to switch the port of the selector, and simultaneously sends the obtained error to the pitch correction value calculator 42. The correction value of the forward position of the pitch tool 7 is obtained, sent to the correction value update storage unit 43, updated to a new correction value and stored, and the pitch is corrected by the new correction value at the time of forming the next coil spring. .
【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, if the measured free length of the coil spring is shorter than the design value, the pitch tool 7 is not used during the next forming process.
When the forward position of the pitch tool 7 is long, the forward position of the pitch tool 7 is negatively corrected and retracted by the corresponding predetermined amount, and the free length approaches the design value. The error is calculated and stored in the memory each time measurement is continuously performed in this manner. When a display command is input from the MDI, for example, a change in the error is displayed on the CRT as a line graph, and the cumulative number of each variation size is displayed as a bar graph on the 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, the following effects can be obtained. A camera and a screen are provided at separate positions on both sides of the spring forming position, and when the coil spring tip blocks a light image in the spring forming direction that is projected from the projector near the camera and projected linearly on the screen. The length of the light image is measured by a camera with a built-in length measuring sensor, and the error is determined by comparing the reference value obtained when the reference spring is measured in advance before the continuous molding with the measurement value during the continuous molding. The camera is focused on the screen, so if the camera is focused on the screen, a clear image can always be obtained regardless of changes in the position of the coil spring in the direction of the lens projection axis. There is no need for difficult adjustments such as vibration and damage to the measurement members.
An accurate measurement value that is not affected by contamination such as molding powder can always be detected, and furthermore, the free length management device is simple and easy to handle without any restriction on the mounting space of the measuring instrument.
【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。In addition, a tolerance is provided in advance on the plus side and / or the minus side with respect to the reference value, and the tolerance is compared with an error to determine the quality of the product. And defective products can be sorted out.
【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 an AA line view 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 illustrating 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 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 DESCRIPTION OF SYMBOLS 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 Quality judgment unit 41 Selection Controller
フロントページの続き (56)参考文献 特開 平６−294631（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) G01B 11/00 - 11/30 102 G01N 21/84 - 21/91 G06T 7/00 Continuation of the front page (56) References JP-A-6-294631 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) G01B 11/00-11/30 102 G01N 21/84- 21/91 G06T 7/00
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 at one side of a spring forming position of the NC coil spring manufacturing machine at right angles to a spring forming direction. Means for measuring the length of the light beam image in the spring forming direction with respect to the light image projected from the light projector and projected linearly on the screen at a predetermined length, comprising a camera and a light projector and a screen on the other side that incorporates The length of the remaining light beam image on the screen blocked by the tip of the coil spring immediately before cutting, which is formed to a free length almost as designed and cut off, is measured by the camera and set as a reference value. Means for storing an error by comparing the measured value of the light image blocked by the tip of the coil spring immediately before cutting during continuous forming processing with the camera with the reference value to obtain an error; Means for determining the amount of pitch correction from the difference to correct the forward position of the pitch tool of the pitch adjusting mechanism.
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. The apparatus according to claim 1, further comprising means for setting and storing an allowable value on the plus side and / or the minus side with respect to the reference value, and means for comparing the error with the allowable value to determine the acceptability. The free length management device for an 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 JPH08110208A (en) | 1996-04-30 |
| JP2978076B2 true 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) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4612552B2 (en) * | 2006-02-10 | 2011-01-12 | 旭精機工業株式会社 | Image processing apparatus and spring molding machine |
| DE102010014385B4 (en) * | 2010-04-06 | 2011-12-08 | Wafios Ag | Method and device for producing coil springs by spring winches, and spring coiling machine |
| JP2013176797A (en) * | 2012-02-29 | 2013-09-09 | Asahi- Seiki Manufacturing Co Ltd | Coil spring forming device and spring length measuring device |
| JP6568906B2 (en) * | 2017-08-10 | 2019-08-28 | 日本発條株式会社 | Coil spring length measuring device and coil spring manufacturing device |
| US11618069B2 (en) | 2018-03-20 | 2023-04-04 | Primetals Technologies USA LLC | Automated wire rod trimming station and sample quality evaluation |
| 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 |
-
1994
- 1994-10-07 JP JP6270263A patent/JP2978076B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08110208A (en) | 1996-04-30 |
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