JP3391856B2 - Work size control method and apparatus in grinding - Google Patents
Work size control method and apparatus in grindingInfo
- Publication number
- JP3391856B2 JP3391856B2 JP21672293A JP21672293A JP3391856B2 JP 3391856 B2 JP3391856 B2 JP 3391856B2 JP 21672293 A JP21672293 A JP 21672293A JP 21672293 A JP21672293 A JP 21672293A JP 3391856 B2 JP3391856 B2 JP 3391856B2
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- work
- grinding
- size
- response delay
- workpiece
- Prior art date
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- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、研削加工におけるワー
クの寸法制御において、制御系の応答遅れに伴うワーク
の取り代のバラツキ及び加工寸法のバラツキ等の弊害を
防止する制御方法及び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 control method and device for preventing adverse effects such as variations in machining allowance and variations in machining dimension due to response delay of a control system in workpiece dimension control in grinding. Is.
【０００２】[0002]
【従来の技術】図３に示すように、研削加工は一般に粗
研削（ｒ）→仕上げ研削（ｆ）→スパークアウト（ｓ
ｏ）の工程順でなされ、各工程ごとに加工予定寸法（シ
ュミット設定値ＳＣＨｒ、ＳＣＨｆ、ＳＣＨｓｏ）が設
定されている。各工程ごとに加工予定寸法を設定するの
は、次工程での加工取り代を確保しておく必要があるた
めである。例えば、仕上げ研削（ｆ）では、粗研削
（ｒ）により生じたワーク表面の変質層を除去するため
に一定量以上の仕上げ取り代を必要とするので、粗研削
（ｒ）では、この仕上げ取り代分を見込んだ寸法をシュ
ミット設定値ＳＣＨｒとしている。図３において、Ｘ１
は砥石台の切り込み送り線図を示し、Ｖはワーク寸法生
成速度を示している。2. Description of the Related Art As shown in FIG. 3, grinding is generally performed by rough grinding (r) → finish grinding (f) → spark out (s).
The process is performed in the order of step o), and the planned machining dimensions (Schmidt set values SCHr, SCHf, SCHso) are set for each step. The planned machining size is set for each process because it is necessary to secure a machining allowance in the next process. For example, in finish grinding (f), a certain amount or more of finishing allowance is required to remove the deteriorated layer on the surface of the work caused by rough grinding (r). The Schmitt set value SCHr is a dimension that allows for an allowance. In FIG. 3, X1
Shows a cutting feed line diagram of the grindstone, and V shows a workpiece dimension generation speed.
【０００３】ところで、自動定寸装置を装備した研削盤
では、加工中のワーク寸法をインプロセスゲージで連続
的に検出し、その検出値を研削盤の制御系にフィードバ
ックして、研削砥石の切り込み送りを自動的に制御する
ようにしている。その際、研削熱による影響分を考慮
し、ワークの熱膨張量を適宜の手段で検出・演算し、こ
の演算値に基いてインプロセスゲージの設定値を補正す
るといった制御手段が従来より採用されてきた。即ち、
インプロセスゲージによる検出値Ｇ（Ｇ１＋Ｇ２）から
ワークの熱膨張量△ｄｐをマイナスした値をワークの実
寸法ｄ＝Ｇ−△ｄｐとして管理し、この実寸法を基準と
して砥石の切り込み送りを制御するのである。By the way, in a grinding machine equipped with an automatic sizing device, the size of a workpiece being machined is continuously detected by an in-process gauge, and the detected value is fed back to the control system of the grinding machine to cut a grinding wheel. The feed is controlled automatically. At that time, considering the influence of grinding heat, the thermal expansion amount of the work is detected and calculated by an appropriate means, and the control means for correcting the set value of the in-process gauge based on this calculated value has been conventionally adopted. Came. That is,
The value obtained by subtracting the thermal expansion amount Δdp of the workpiece from the detected value G (G1 + G2) by the in-process gauge is managed as the actual dimension d = G−Δdp of the workpiece, and the cutting feed of the grindstone is controlled based on this actual dimension. Of.
【０００４】尚、熱膨張量△ｄｐの検出・演算手段とし
て、例えば、粗研削動力を一定レベルに制御し、粗研削
中の研削時間から粗研削動力の上記レベルに応じた研削
熱によるワークの熱膨張量を演算する手段（本出願人に
よる特公平４−４８５８４号公報参照）、研削中の研削
動力と熱流入定数及び熱流出定数からワークの熱膨張量
を演算する手段（本出願人による特願平３−２１９７２
８号）等がある。As a means for detecting and calculating the amount of thermal expansion Δdp, for example, the rough grinding power is controlled to a constant level, and the grinding heat corresponding to the level of the rough grinding power from the grinding time during the rough grinding is used for the work. Means for calculating the amount of thermal expansion (see Japanese Patent Publication No. 4-48584 by the applicant), means for calculating the amount of thermal expansion of the work from the grinding power during grinding, the heat inflow constant and the heat outflow constant (by the applicant) Japanese Patent Application No. 3-21972
No. 8) etc.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、制御系
にはその制御系に固有の応答遅れ時間（△ｔ）があり、
インプロセスゲージによるワークの寸法検出から、制御
装置による補正量演算等を経て、砥石の切り込み送りが
実際に切り換えられるまでの間にはタイムラグが不可避
である。そのため、例えば図３において、制御装置が粗
研削（ｒ）の終了時をｄ＝Ｇ−△ｄｐ＝ＳＣＨｒとして
判断し、この判断に基いて信号を出力し、砥石の切り込
み送りを実際に切り換えた時点では、既に、応答遅れ時
間△ｔｒ（インプロセスゲージによる寸法検出時から起
算）に対応する寸法△ｄｒ＝Ｖ・△ｔｒ（Ｖ：ワーク寸
法生成速度）だけシュミット設定値ＳＣＨｒよりも加工
が進行してしまっている。これは、仕上げ研削（ｆ）で
の仕上げ取り代が△ｄｒだけ減少することを意味する。
しかも、ワーク寸法生成速度Ｖは砥石の切れ味等によっ
て微妙に変動し、そのために、加工進行寸法△ｄｒにバ
ラツキが生じるので、一定量以上の仕上げ研削代を確保
しようとすると、寸法△ｄｒのバラツキ分を見込んで、
仕上げ研削代をある程度大きく設定しておく必要が生じ
る。このことは、加工時間の増大、加工効率の低下につ
ながる。同様のことは、仕上げ研削（ｆ）からスパーク
アウト（ｓｏ）への移行時、スパークアウト（ｓｏ）の
終了時にも生じ、加工精度にも影響を及ぼす。However, the control system has a response delay time (Δt) peculiar to the control system.
A time lag is unavoidable from the detection of the workpiece size by the in-process gauge to the actual switching of the cutting feed of the grindstone after the correction amount calculation by the control device. Therefore, for example, in FIG. 3, the control device determines the end of the rough grinding (r) as d = G-Δdp = SCHr, outputs a signal based on this determination, and actually switches the cutting feed of the grindstone. At this point, the processing has already progressed beyond the Schmidt set value SCHr by the dimension corresponding to the response delay time Δtr (calculated from the dimension detection by the in-process gauge) Δdr = V · Δtr (V: workpiece dimension generation speed). I have done it. This means that the finishing stock removal in finish grinding (f) is reduced by Δdr.
In addition, the work dimension generation speed V slightly changes due to the sharpness of the grindstone, etc., which causes variations in the machining progress dimension Δdr. In anticipation of the minute,
It is necessary to set the finishing grinding allowance to some extent. This leads to an increase in processing time and a decrease in processing efficiency. The same thing occurs at the time of transition from finish grinding (f) to spark-out (so) and at the end of spark-out (so), which also affects the machining accuracy.
【０００６】本発明の目的は、上述したような制御系の
応答遅れ時間に起因した弊害を解消し得る研削加工にお
けるワークの寸法制御方法及び装置を提供することにあ
る。It is an object of the present invention to provide a work size control method and apparatus in a grinding process which can eliminate the above-mentioned adverse effects caused by the response delay time of the control system.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明の方法は、加工中のワーク寸法をインプロセ
スゲージで連続的に検出し、この検出値に基いて砥石の
切り込み送りを制御しながら、ワークを各工程ごとに指
定された寸法まで加工する方法において、研削砥石駆動
モータの研削動力より加工中のワーク寸法生成速度を求
め、そのワーク寸法生成速度と予め求めた制御系の応答
遅れ時間より応答遅れによるワーク寸法変化量を計算
し、インプロセスゲージの寸法信号に応答遅れによるワ
ーク寸法変化量を補正した応答遅れ時間後のワーク寸法
を予想ワーク寸法として監視し、制御点のワーク寸法変
化量だけ手前で切り込み送り切換え指令を出すものであ
る。In order to achieve the above object, the method of the present invention continuously detects the size of a workpiece during machining with an in-process gauge and controls the cutting feed of the grindstone based on the detected value. However, in the method of processing the work up to the specified size for each process, the grinding wheel drive
Calculate the workpiece dimension generation speed during machining from the motor grinding power, and calculate the workpiece dimension change amount due to the response delay from the workpiece dimension generation rate and the response delay time of the control system obtained in advance, and respond to the dimension signal of the in-process gauge. The work dimension after the response delay time, in which the work dimension variation due to the delay is corrected, is monitored as the predicted work dimension and the work dimension variation at the control point is monitored.
The cutting feed switching command is issued in front of the conversion amount .
【０００８】そして本発明の装置は、加工中のワーク寸
法をインプロセスゲージで連続的に検出し、この検出値
に基いて砥石の切り込み送りを制御しながら、ワークを
各工程ごとに指定された寸法まで加工する装置におい
て、加工中のワーク寸法を検出するインプロセスゲージ
と、研削砥石駆動モータの研削動力を測定する研削動力
測定部と、研削砥石駆動モータの研削動力より加工中の
ワーク寸法生成速度を求め、そのワーク寸法生成速度と
予め求めた制御系の応答遅れ時間より応答遅れによるワ
ーク寸法変化量を計算し、インプロセスゲージの寸法信
号に応答遅れによるワーク寸法変化量を補正した応答遅
れ時間後のワーク寸法を計算し、その応答遅れ後のワー
ク寸法と切り込み送り変更用既設定寸法値を比較判定す
る演算・比較判定部と、該比較判定部の比較判定結果に
基づき研削機械の切り込み送り駆動部に、制御点のワー
ク寸法変化量だけ手前で切り込み送り切換え指令を出す
切り込み送り指令出力部とで構成したものである。The apparatus of the present invention continuously detects the size of the work being processed by the in-process gauge, and controls the cutting feed of the grindstone based on the detected value, and the work is designated for each process. In a device that processes up to dimensions, an in-process gauge that detects the size of the work being processed, a grinding power measurement unit that measures the grinding power of the grinding wheel drive motor , and a work size generation during processing from the grinding power of the grinding wheel drive motor Calculate the speed, calculate the work size change amount due to the response delay from the work size generation speed and the previously determined response delay time of the control system, and correct the work size change amount due to the response delay to the in-process gauge size signal Response delay calculate the workpiece dimensions after hours, the response delay after the workpiece dimensions as notch comparing determines calculates the feed changes for preset dimension-comparison judgment unit , The cut feed drive unit of the grinding machine on the basis of the comparison judgment result of the comparison determination unit, the control point Wah
(C) A cutting feed command output unit that issues a cutting feed switching command in front of the dimensional change amount .
【０００９】[0009]
【作用】本発明は、研削動力より加工中のワーク寸法生
成速度を求め、そのワーク寸法生成速度と予め求めた制
御系の応答遅れ時間より制御系の応答遅れによるワーク
寸法変化量を求める。次に、切り込み送り制御系の応答
遅れ時間後に切り込み送りが切り換わるときのワーク寸
法（＝寸法信号＋遅れ時間中のワーク寸法変化量）を予
測し、その寸法と設定寸法を比較し、一致すれば切り込
み送り切換え指令を出す。即ち、制御系の応答遅れ時間
後に予想されるワーク寸法を上記方法で定量的に求めて
制御するため、制御系の応答遅れ時間中のワーク寸法の
バラツキ及び取り代のバラツキを抑制することができ
る。According to the present invention, the work size generation rate during machining is obtained from the grinding power, and the work size change amount due to the response delay of the control system is obtained from the work size generation rate and the previously determined response delay time of the control system. Next, predict the work size (= dimension signal + work size change amount during delay time) when the cut feed switches after the response delay time of the cut feed control system, compare that size with the set size, and check if they match. For example, issue a cut feed switching command. That is, since the work size expected after the response delay time of the control system is quantitatively obtained and controlled by the above method, it is possible to suppress the work size variation and the stock removal variation during the response delay time of the control system. .
【００１０】[0010]
【実施例】以下、本発明の方法の実施例を図１に基づい
て説明する。図１は加工終了付近における加工中のワー
ク寸法（縦軸）と時間（横軸）との関係を示す図表であ
って、同図左から粗研削（ｒ）→仕上げ研削（ｆ）→ス
パークアウト（ｓｏ）の順で研削加工が行なわれるもの
で、今、粗研削加工中、インプロセスゲージからの寸法
信号Ｘ2が設定値Ｓｒに達した時仕上げ研削加工に切り
換わり、仕上げ研削加工中、寸法信号Ｘ2が設定値Ｓｆ
に達した時切り込みを後退させるパターンの場合を説明
例としている。なお、図１において、Ｘ１は砥石台の切
り込み送り線図を示し、δfは仕上げ取り代を示してい
る。EXAMPLE An example of the method of the present invention will be described below with reference to FIG. FIG. 1 is a diagram showing the relationship between the workpiece size (vertical axis) and time (horizontal axis) during machining near the end of machining. From the left of the figure, rough grinding (r) → finish grinding (f) → spark out Grinding is performed in the order of (so). Now, during rough grinding, when the dimension signal X2 from the in-process gauge reaches the set value Sr, switching to finish grinding is performed, and during finish grinding, Signal X2 is set value Sf
The case of a pattern in which the notch is retracted when the number of times reaches is described as an example. In addition, in FIG. 1, X1 indicates a cutting feed line of the grinding stone head, and δf indicates a finishing allowance.
【００１１】通常、Ｘ2＝Ｓｒにて切り込み速度切換え
指令が出るが、制御系の応答遅れにより、実際に切り換
わるまでに△ｔrの時間遅れが生じる。また、Ｘ2＝Ｓｆ
にて切り込み後退となるが、同様に△ｔfの時間遅れが
生じる。この遅れ時間は、各研削機械の制御系に固有の
ものであって、予め、測定しておくことにより、既知の
値（一種の定数）として取り扱うことができる。Normally, a cutting speed switching command is issued when X2 = Sr, but due to the response delay of the control system, a time delay of Δtr occurs before the actual switching. Also, X2 = Sf
Although the cutting will retreat at, the time delay of .DELTA.tf similarly occurs. This delay time is unique to the control system of each grinding machine, and can be treated as a known value (a kind of constant) by measuring it in advance.
【００１２】研削加工中のワーク寸法生成速度Ｖ2は、
研削動力Ｐに関係することより、Ｖ2＝ｆ（Ｐ）…
（〓）式で表される。（式中のｆは関数記号）The workpiece dimension generation speed V2 during grinding is
Since it is related to the grinding power P, V2 = f (P) ...
It is expressed by the formula (〓). (F in the formula is a function symbol)
【００１３】上記（〓）式は、小野浩二著「研削仕上」
（槙書店１９７２．７発行）第２１頁〜第２３頁 ２・
３ 比研削抵抗の項を参照すると、
Ｆｔ＝ｋ1・ｔ0.88
ｋ1：ワーク、加工条件で決まる定数
Ｆｔ：接線研削力
ｔ：切り込み深さ
Ｖ2：ワーク寸法生成速度
Ｎｗ：ワーク回転数
であるから、
Ｆｔ＝ｋ2・Ｖ20.88
ｋ2：ワーク、加工条件で決まる定数
研削動力Ｐ＝Ｆｔ・Ｕｇ
Ｕｇ：砥石周速度
であるから、
Ｐ＝ｋ3・Ｖ20.88
ｋ3：ワーク、加工条件で決まる定数
∴ Ｖ2＝ｋ・Ｐ1.14
ｋ：ワーク、加工条件で決まる定数The above formula (〓) is based on "Grinding Finish" by Koji Ono.
(Published by Maki Shoten 1972.7) Pages 21 to 23 2.
3 Referring to the section of specific grinding resistance, Ft = k1 · t 0.88 k1: constant determined by work and processing conditions Ft: tangential grinding force t: depth of cut V2: Workpiece size generation speed Nw: Workpiece rotation speed, Ft = k2 · V2 0.88 k2: Constant grinding power P = Ft · Ug Ug: Grindstone peripheral speed, P = k3 · V2 0.88 k3: Constant determined by work and processing conditions ∴ V2 = k · P 1.14 k: Constant determined by work and processing conditions
【００１４】従って、制御系の応答遅れ時間中のワーク
寸法変化量△ｄr（粗研削）、△ｄf（仕上げ研削）は、
それぞれ粗研削には添字rを、仕上げ研削には添字fを付
けて表せば
△ｄr＝Ｖ2r・△ｔr＝ｆ（Ｐr）・△ｔr…（〓）式
△ｄf＝Ｖ2f・△ｔf＝ｆ（Ｐf）・△ｔf…（〓）式
となる。Therefore, the work size change amounts Δdr (rough grinding) and Δdf (finish grinding) during the response delay time of the control system are
The suffix r is used for rough grinding and the suffix f is used for finish grinding. Δdr = V2r · Δtr = f (Pr) · Δtr ... (〓) Formula Δdf = V2f · Δtf = f ( Pf) · Δtf ... (〓) formula.
【００１５】研削動力Ｐは、加工状態によって変化する
ため、例えばＰf＋△Ｐfの場合の寸法変化量は、
△ｄf’＝ｆ（Ｐf＋△Ｐf）・△ｔf
となり、制御系の応答遅れ時間中のワーク寸法変化量は
バラツキを生じ、仕上げ取り代もバラツキを生じる。ス
パークアウト研削においても同様である。Since the grinding power P changes depending on the processing state, for example, the amount of dimensional change in the case of Pf + ΔPf is Δdf ′ = f (Pf + ΔPf) · Δtf, which is the response delay time of the control system. The work size variation varies, and the finishing allowance also varies. The same applies to spark-out grinding.
【００１６】そこで、本発明は、制御系の応答遅れ時間
後の予想寸法Ｘ2＋△ｄ（これは内面研削の場合で、外
面研削の場合はＸ2−△ｄである）を監視することによ
り、制御系の応答遅れ分を見込んで、制御点より前に切
り込み送り切換え指令を出すことにより、ワーク加工寸
法のバラツキ、仕上げ取り代のバラツキを抑制すること
ができる。Therefore, according to the present invention, the control is performed by monitoring the expected dimension X2 + Δd after the response delay time of the control system (this is the case of inner surface grinding and X2−Δd in the case of outer surface grinding). By taking into account the response delay of the system and issuing a cutting feed switching command before the control point, it is possible to suppress variations in workpiece machining dimensions and variations in finishing allowance.
【００１７】即ち、本発明の方法は、加工中のワーク寸
法をインプロセスゲージで検出し、この検出値に基いて
砥石の切り込み送りを制御しながら、ワークを各工程ご
とに指定された寸法まで加工する方法において、研削動
力Ｐより加工中のワーク寸法生成速度Ｖ2を求め、その
ワーク寸法生成速度Ｖ2と予め求めた制御系の応答遅れ
時間△ｔより応答遅れによるワーク寸法変化量△ｄを計
算し、インプロセスゲージの寸法信号Ｘ2に応答遅れに
よるワーク寸法変化量△ｄを補正した寸法Ｘ2＋△ｄ
（内面研削時）またはＸ2−△ｄ（外面研削時）を予想
ワーク寸法として切り込み制御を行うようにしたもので
ある。That is, according to the method of the present invention, the size of a workpiece being machined is detected by an in-process gauge, and based on the detected value, the cutting feed of the grindstone is controlled, and the workpiece is sized up to a specified dimension for each process. In the machining method, the workpiece dimension generation speed V2 during machining is calculated from the grinding power P, and the workpiece dimension change amount Δd due to the response delay is calculated from the workpiece dimension generation speed V2 and the previously determined response delay time Δt of the control system. Then, the dimension signal X2 of the in-process gauge is corrected, and the dimension variation Δd due to the response delay is corrected.
The cutting control is performed with the predicted work size (when the inner surface is ground) or X2-Δd (when the outer surface is ground).
【００１８】次に、上記本発明の方法を実施するための
装置の構成を図２に基づいて説明する。Next, the construction of an apparatus for carrying out the method of the present invention will be described with reference to FIG.
【００１９】図２において、（１）は砥石、（２）は研
削機械のベッド、（３）は砥石台、（４）は砥石軸駆動
モータ、（５）は切り込み送り駆動部、（６）はワー
ク、（７）はインプロセスゲージ、（８）は研削動力測
定部、（９）は演算・比較判定部、（１０）は切り込み
送り指令出力部を示している。In FIG. 2, (1) is a grindstone, (2) is a bed of a grinding machine, (3) is a grindstone base, (4) is a grindstone axis drive motor, (5) is a cutting feed drive unit, and (6). Is a workpiece, (7) is an in-process gauge, (8) is a grinding power measuring unit, (9) is a calculation / comparison determination unit, and (10) is a cutting feed command output unit.
【００２０】砥石（１）は砥石台（３）上に取付けら
れ、砥石軸駆動モータ（４）で回転駆動される。そし
て、研削機械のベッド（２）に対して切り込み送り駆動
部（５）により、砥石台（３）を介して砥石（１）がワ
ーク（６）に向けて前進後退動作する。図２は、砥石
（１）でワーク（６）の外径研削を行なっている場合を
例示している。The grindstone (1) is mounted on a grindstone base (3) and is rotationally driven by a grindstone shaft drive motor (4). Then, the cutting feed drive unit (5) moves the grindstone (1) forward and backward toward the work (6) via the grindstone base (3) with respect to the bed (2) of the grinding machine. FIG. 2 exemplifies a case where the workpiece (6) is ground by the grindstone (1).
【００２１】インプロセスゲージ（７）は、砥石（１）
で外径研削されているワーク（６）の外径寸法を検出し
ている場合を例示している。このインプロセスゲージ
（７）で検出されたワーク寸法は、寸法信号Ｘ2として
Ａ／Ｄ変換部（１１）でＡ／Ｄ変換して演算・比較判定
部（９）に送り込まれる。The in-process gauge (7) is a grindstone (1).
The case where the outer diameter dimension of the workpiece (6) whose outer diameter has been ground is detected is illustrated. The work size detected by the in-process gauge (7) is A / D converted by the A / D conversion unit (11) as a size signal X2 and sent to the calculation / comparison determination unit (9).
【００２２】一方、研削動力測定部（８）は、ワーク
（６）の外径研削を行なっている砥石（１）の研削動力
Ｐを砥石軸駆動モータ（４）の電流値または電圧値ある
いは消費電力値等の動力信号Ｐ’から測定する。そし
て、測定された研削動力Ｐは、Ａ／Ｄ変換部（１１）で
Ａ／Ｄ変換した後、演算・比較判定部（９）に送り込ま
れる。On the other hand, the grinding power measuring unit (8) uses the grinding power P of the grindstone (1) which is grinding the outer diameter of the workpiece (6) as the current value or voltage value or consumption of the grindstone shaft driving motor (4). It is measured from a power signal P ′ such as an electric power value. Then, the measured grinding power P is A / D converted by the A / D conversion unit (11) and then sent to the calculation / comparison determination unit (9).
【００２３】演算・比較判定部（９）は、研削動力Ｐよ
り加工中のワーク寸法生成速度Ｖ2をＶ2＝ｆ（Ｐ）とし
て求め、このワーク寸法生成速度Ｖ2と、予め測定して
既知の値として演算・比較判定部（９）に設定してある
切り込み送り制御系の応答遅れ時間△ｔとより、応答遅
れによるワーク寸法変化量△ｄを前記した数式により計
算し、インプロセスゲージ（７）の寸法信号Ｘ2に応答
遅れによるワーク寸法変化量△ｄを補正した応答遅れ後
のワーク寸法Ｘ2−△ｄを求め、その応答遅れ後のワー
ク寸法Ｘ2−△ｄ（内径研削時はＸ2＋△ｄ）と切り込み
送り変更用既設定寸法値Ｓ（粗研削時はＳｒ、仕上げ研
削時はＳｆ、スパークアウト時はＳｓｏ）を比較判定す
るものである。The calculation / comparison determination unit (9) obtains the workpiece dimension generation speed V2 during machining from the grinding power P as V2 = f (P), and the workpiece dimension generation speed V2 and a previously known value. From the response delay time Δt of the cutting feed control system set in the calculation / comparison determination unit (9) as above, the work dimension change amount Δd due to the response delay is calculated by the above-mentioned mathematical formula, and the in-process gauge (7) Workpiece size X2-Δd after the response delay is obtained by correcting the work size change amount Δd due to the response delay to the dimension signal X2 of X, and the work dimension X2-Δd after the response delay (X2 + Δd when grinding the inner diameter) And a preset dimension value S for changing the cutting feed (Sr during rough grinding, Sf during finish grinding, Sso during sparkout) are compared and determined.
【００２４】切り込み送り指令出力部（１０）は、上記
演算・比較判定部（９）の比較判定結果に基づいて研削
機械の切り込み送り駆動部（５）に切り込み送り切換え
指令を出すものである。The cutting feed command output unit (10) issues a cutting feed switching command to the cutting feed drive unit (5) of the grinding machine based on the comparison / judgment result of the calculation / comparison judgment unit (9).
【００２５】本発明の装置の実施例は、以上の構成から
なり、次のような動作を有する。即ち、研削動力測定部
（８）にて測定した研削動力Ｐを用いて演算・比較判定
部（９）でワーク寸法生成速度Ｖ2を求め、このワーク
寸法生成速度Ｖ2と、予め設定してある制御系の応答遅
れ時間△ｔとから、応答遅れ時間中のワーク寸法変化量
△ｄを前記数式により求め、このワーク寸法変化量△ｄ
と、インプロセスゲージ（７）の寸法信号Ｘ2とから、
応答遅れ時間後の予想寸法Ｘ2−△ｄ（外径研削時）ま
たはＸ2＋△ｄ（内径研削時）を求め、この予想寸法Ｘ2
−△ｄ（外径研削時）またはＸ2＋△ｄ（内径研削時）
と切り込み送り変更用既設定寸法値Ｓ（粗研削時はＳ
ｒ、仕上げ研削時はＳｆ、スパークアウト時はＳｓｏ）
を比較判定する。そして、それらが一致すれば切り込み
送り指令出力部（１０）から研削機械の切り込み送り駆
動部（５）に切り込み送り切換え指令を出す。例えば、
外径粗研削加工中であれば、設定寸法値Ｓｒに対して制
御系の応答遅れ時間中のワーク寸法変化量△ｄrだけ手
前で仕上げ研削の切り込み送りに切換えさせる指令を出
すのである。The embodiment of the apparatus of the present invention is constructed as described above and has the following operation. That is, the calculation / comparison determination unit (9) obtains the work dimension generation speed V2 using the grinding power P measured by the grinding power measurement unit (8), and the work dimension generation speed V2 and preset control. From the response delay time Δt of the system, the work dimension change amount Δd during the response delay time is obtained by the above formula, and this work dimension change amount Δd
And the dimension signal X2 of the in-process gauge (7),
Calculate the expected size X2-Δd (when grinding the outer diameter) or X2 + Δd (when grinding the inner diameter) after the response delay time
-△ d (for outer diameter grinding) or X2 + △ d (for inner diameter grinding)
And the preset dimension value S for changing the cutting feed (S for rough grinding
r, Sf for finish grinding, Sso for spark out)
Is compared and judged. If they match, the cutting feed command output unit (10) issues a cutting feed switching command to the cutting feed drive unit (5) of the grinding machine. For example,
If the outer diameter rough grinding is being performed, a command is issued to switch to the cutting feed for finish grinding before the set dimension value Sr by the work dimension change amount Δdr during the response delay time of the control system.
【００２６】[0026]
【発明の効果】本発明によれば、加工中のワーク寸法を
インプロセスゲージで検出し、この検出値に基いて砥石
の切り込み送りを制御しながら、ワークを各工程ごとに
指定された寸法まで加工する定寸研削加工において、制
御系の応答遅れ時間中のワーク寸法のバラツキ及び仕上
げ取り代のバラツキを抑制することができ、加工精度を
向上させ、加工時間を一定かつ短縮させることができ
る。According to the present invention, the size of a workpiece being machined is detected by an in-process gauge, and the cutting feed of the grindstone is controlled on the basis of the detected value, and the workpiece can be controlled up to a specified dimension for each process. In the constant-size grinding process for machining, it is possible to suppress the variation of the work size and the variation of the finishing allowance during the response delay time of the control system, improve the machining accuracy, and make the machining time constant and shortened.
【図１】本発明の制御方法を説明するための加工終了付
近における加工中のワーク寸法（縦軸）と時間（横軸）
との関係を示すワークの実寸法線図及び砥石台の切り込
み送り線図。FIG. 1 is a diagram illustrating a work size (vertical axis) and time (horizontal axis) during machining in the vicinity of machining end for explaining a control method of the present invention.
The actual dimension diagram of the workpiece and the cutting feed diagram of the grinding stone stand showing the relationship with.
【図２】本発明の制御装置全体の概略を示すブロック線
図。FIG. 2 is a block diagram showing an outline of the entire control device of the present invention.
【図３】従来の制御方法におけるワークの実寸法線図及
び砥石台の切り込み送り線図。FIG. 3 is an actual dimension diagram of a workpiece and a cutting feed line diagram of a grindstone base in a conventional control method.
１ 砥石 ２ 研削機械のベッド ３ 砥石台 ４ 砥石軸駆動モータ ５ 切り込み送り駆動部 ６ ワーク ７ インプロセスゲージ ８ 研削動力測定部 ９ 演算・比較判定部 １０ 切り込み送り指令出力部 Ｐ 研削動力 Ｘ2 インプロセスゲージの寸法信号 Ｖ2 ワーク寸法生成速度 △ｔ 制御系の応答遅れ時間 △ｄ 制御系の応答遅れ時間中のワーク寸法変化量 1 whetstone 2 Bed of grinding machine 3 whetstone stand 4 Wheel drive motor 5 Cutting feed drive 6 work 7 In-process gauge 8 Grinding power measurement unit 9 Calculation / comparison judgment section 10 Cutting feed command output section P grinding power Dimension signal of X2 in-process gauge V2 Work size generation speed Δt Control system response delay time Δd Amount of work size change during response delay time of control system
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B23Q 15/00 - 15/28 B24B 41/00 - 51/00 G05B 19/18 - 19/46 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) B23Q 15/00-15/28 B24B 41/00-51/00 G05B 19/18-19/46
Claims (2)
ジで連続的に検出し、この検出値に基いて砥石の切り込
み送りを制御しながら、ワークを各工程ごとに指定され
た寸法まで加工する方法において、研削砥石駆動モータの 研削動力より加工中のワーク寸法
生成速度を求め、そのワーク寸法生成速度と予め求めた
制御系の応答遅れ時間より応答遅れによるワーク寸法変
化量を計算し、インプロセスゲージの寸法信号に応答遅
れによるワーク寸法変化量を補正した応答遅れ時間後の
ワーク寸法を予想ワーク寸法として監視し、制御点のワ
ーク寸法変化量だけ手前で切り込み送り切換え指令を出
すことを特徴とする研削加工におけるワークの寸法制御
方法。1. A method of continuously measuring a workpiece size during processing by an in-process gauge, and controlling a cutting feed of a grindstone on the basis of the detected value to process the workpiece up to a specified size for each process. In, the work size generation speed during machining is calculated from the grinding power of the grinding wheel drive motor, and the work size change amount due to the response delay is calculated from the work size generation speed and the response delay time of the control system calculated in advance. After the response delay time after correcting the workpiece dimension change amount due to the response delay in the
The work size is monitored as the predicted work size, and the control point
A cut feed switching command is issued in front of the change amount
Dimensional control method for work in grinding, characterized in that to.
ジで連続的に検出し、この検出値に基いて砥石の切り込
み送りを制御しながら、ワークを各工程ごとに指定され
た寸法まで加工する装置において、 加工中のワーク寸法を検出するインプロセスゲージと、
研削砥石駆動モータの研削動力を測定する研削動力測定
部と、研削砥石駆動モータの研削動力より加工中のワー
ク寸法生成速度を求め、そのワーク寸法生成速度と予め
求めた制御系の応答遅れ時間より応答遅れによるワーク
寸法変化量を計算し、インプロセスゲージの寸法信号に
応答遅れによるワーク寸法変化量を補正した応答遅れ時
間後のワーク寸法を計算し、その応答遅れ後のワーク寸
法と切り込み送り変更用既設定寸法値を比較判定する演
算・比較判定部と、該比較判定部の比較判定結果に基づ
き研削機械の切り込み送り駆動部に、制御点のワーク寸
法変化量だけ手前で切り込み送り切換え指令を出す切り
込み送り指令出力部とを有することを特徴とする研削加
工におけるワークの寸法制御装置。2. An apparatus for continuously measuring the size of a work being processed by an in-process gauge, and controlling the cutting feed of the grindstone based on the detected value, and processing the work to a size specified for each process. In the in-process gauge that detects the workpiece size during machining,
The grinding power measurement unit that measures the grinding power of the grinding wheel drive motor, and the work size generation speed during machining are calculated from the grinding power of the grinding wheel drive motor , and based on the work size generation speed and the previously determined response delay time of the control system. work dimensional change was calculated according to the response delay, the time of response delay by correcting the work amount of dimensional change response delay dimension signal-process gauge
Calculates the work size after a certain period of time, calculates and compares the work size after the response delay with the preset size value for cutting feed change, and the cutting of the grinding machine based on the comparison judgment result of the comparison judgment unit Workpiece size of the control point on the feed drive
A workpiece dimension control device in grinding, comprising a cutting feed command output unit for issuing a cutting feed switching command in front of a legal change amount .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21672293A JP3391856B2 (en) | 1993-08-31 | 1993-08-31 | Work size control method and apparatus in grinding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21672293A JP3391856B2 (en) | 1993-08-31 | 1993-08-31 | Work size control method and apparatus in grinding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0760608A JPH0760608A (en) | 1995-03-07 |
| JP3391856B2 true JP3391856B2 (en) | 2003-03-31 |
Family
ID=16692901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21672293A Expired - Fee Related JP3391856B2 (en) | 1993-08-31 | 1993-08-31 | Work size control method and apparatus in grinding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3391856B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008023691A (en) * | 2006-07-25 | 2008-02-07 | Univ Nihon | Grinding device and control program, and grinding method |
| JP5065648B2 (en) * | 2006-10-12 | 2012-11-07 | 株式会社シギヤ精機製作所 | Grinder |
-
1993
- 1993-08-31 JP JP21672293A patent/JP3391856B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0760608A (en) | 1995-03-07 |
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