JPH048475A - Detecting method of blinding of grinding wheel - Google Patents
Detecting method of blinding of grinding wheelInfo
- Publication number
- JPH048475A JPH048475A JP10627990A JP10627990A JPH048475A JP H048475 A JPH048475 A JP H048475A JP 10627990 A JP10627990 A JP 10627990A JP 10627990 A JP10627990 A JP 10627990A JP H048475 A JPH048475 A JP H048475A
- Authority
- JP
- Japan
- Prior art keywords
- grinding
- grinding wheel
- acceleration sensor
- bearing
- blinding
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001133 acceleration Effects 0.000 claims abstract description 23
- 230000002159 abnormal effect Effects 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007779 soft material Substances 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- -1 aluminum Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
Landscapes
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は金属、特にアルミニウムに代表される軟質材料
を研削加工する過程で、目づまりの異常状態を事前にか
つ高い精度で検知でき、目づまりした切りくずの除去の
タイミング（時期）の判断を正確に予測できる研削砥石
の目づまりの検知方法に関するものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention is capable of detecting an abnormal state of clogging in advance and with high accuracy in the process of grinding a soft material such as metal, especially aluminum, and detects clogging. The present invention relates to a method for detecting clogging of a grinding wheel that can accurately predict the timing of removing chips.
〈従来の技術〉
金属、特にアルミニウムに代表される軟質材料を研削加
工すると、研削を繰り返すうちに、切りくずが砥石表面
に付着する目づまりの現象が生じる。そこで、砥粒切れ
刃が材料を僚るような状態で切削がなされ、又目づまり
の生じる場所はランダムな位置に発生するため、その異
常状態では研削音が鈍くなったり、異常振動が発生する
。研削加工は精密加工として位置づけられ、最後の仕上
げとして用いられることから、わずかな目づまりでも、
研削表面を劣化させ作業能率を著しく悪くする。従って
目づまりの異常状態では、砥粒切れ刃が材料をこする状
態で切削作用が進行するため、研削抵抗が大きくなった
り、材料表面の状態はかなり劣化する。その為、研削抵
抗の上昇は砥石モーターに異常な負荷がかかるため、電
流値の異常状態を検知して監視する方法もある。更に通
常の正常加工時には発生しないある周波数の振動や研削
音が発生する。従来は、熟練作業者がこの振動や音の微
妙な変化をとらえて加工状態を判断し、砥石摩耗の検出
や破損の予知を行っていた。しかし、最近では機械工場
における自動化、省力化、合理化等が押し進められてい
るため、これにともない監視も自動化の必要性が生じて
いる。<Prior Art> When metals, particularly soft materials such as aluminum, are ground, as the grinding process is repeated, chips adhere to the surface of the grinding wheel, causing clogging. Therefore, cutting is performed with the abrasive cutting edge gripping the material, and clogging occurs at random positions, so in such abnormal conditions, the grinding sound becomes dull and abnormal vibrations occur. Grinding is considered precision processing and is used as the final finishing touch, so even the slightest clogging can be avoided.
It deteriorates the grinding surface and significantly reduces work efficiency. Therefore, in an abnormal state of clogging, the cutting action progresses while the abrasive cutting edge scrapes the material, so the grinding resistance increases and the condition of the material surface deteriorates considerably. For this reason, an increase in grinding resistance places an abnormal load on the grinding wheel motor, so there is a method of detecting and monitoring the abnormal state of the current value. Furthermore, vibrations and grinding noises of a certain frequency that do not occur during normal machining are generated. Previously, skilled workers had to detect subtle changes in vibrations and sounds to judge the machining status, detect wear on the grindstone, and predict breakage. However, recently, automation, labor saving, rationalization, etc. have been promoted in machine factories, and along with this, there has been a need to automate monitoring as well.
そこで加工状態での目づまりの監視の良否は、異常振動
や研削音をどのように利用するかにかかっている。又振
動を利用する場合には、センサーの取り付は位置によっ
ても微妙に変化するため位置の選択は重要である。Therefore, the quality of monitoring for clogging during machining depends on how abnormal vibrations and grinding noises are used. Furthermore, when using vibration, the selection of the location is important because the mounting of the sensor changes slightly depending on the location.
現在は、センサーの取り付は位置は砥石の頭上の近傍、
又はテーブル上等砥石軸から離れた場所に設置されてい
る。その為異常信号が極めて微弱な状態で感知されるた
めの高精度のセンサーが必要とされる。Currently, the sensor is installed near the head of the grinding wheel.
Or, it is installed on a table, etc., away from the grinding wheel axis. Therefore, a high-precision sensor is required to detect abnormal signals even when they are extremely weak.
〈発明が解決しようとする課題〉
本発明では上記砥石軸から離れた場所にしか設置できな
い現状を解決する為に砥石の回転を止めること無く、砥
石軸に所要手段によってセンサーを取り付は目づまり切
りくずの除去のタイミングを正確に検知する方法を提供
することを目的とするものである。<Problems to be Solved by the Invention> In order to solve the current situation where the sensor can only be installed at a location away from the grinding wheel shaft, the present invention aims to solve the problem of installing the sensor on the grinding wheel shaft by the necessary means without stopping the rotation of the grinding wheel. It is an object of the present invention to provide a method for accurately detecting the timing of chip removal.
く課題を解決するための手段〉
本発明では、センサーを砥石軸に取り付ける治具を工夫
し、それにベアリング軸受を取り付ける方法を開発した
。この方法を用いると、軸受を介してマグネット式の加
速度センサーを取り付けることができ、目づまりによる
砥石軸の微妙な振動変化をダイレクトに加速度センサー
に伝えることができる。Means for Solving the Problems In the present invention, a jig for attaching a sensor to a grindstone shaft was devised, and a method for attaching a bearing to the jig was developed. Using this method, a magnetic acceleration sensor can be attached via a bearing, and subtle vibration changes in the grinding wheel shaft due to clogging can be directly transmitted to the acceleration sensor.
又目づまりによる異常振動とベアリングの振動をデータ
処理の段階で分離する為に、ＦＦＴアナライザーを用い
、周波数帯域を分けることができた。In addition, in order to separate abnormal vibrations due to clogging and bearing vibrations at the data processing stage, we were able to separate the frequency bands using an FFT analyzer.
次に得られた振動（信号）を定量化するため、ＡＤＦ処
理を行い、研削砥石の切れ味を示す指標値に数値化した
。Next, in order to quantify the obtained vibration (signal), ADF processing was performed and the vibration (signal) was quantified into an index value indicating the sharpness of the grinding wheel.
く作用〉
砥石の目づまりは進行すると、研削回数の増加とともに
、研削抵抗（砥石に作用する力）が急激に変化し、最後
には研削不能の状態に至る。それに至る過程は第４図及
び第７図にそれぞれ示されるように３段階のステージに
分類され、加速度センサーから得られた振動を処理した
指標値はその変化に精度良く対応し、同様に３つのステ
ージに分類することができた。即ち加速度センサーは砥
石軸と一体化しているため、より精度の高い異常振動を
直接に抽出するため、極めて簡便な方法で目づまりを高
精度で予測予知が可能となる。As the grinding wheel becomes clogged, the grinding resistance (force acting on the grinding wheel) changes rapidly as the number of grinding increases, and eventually grinding becomes impossible. The process leading to this is classified into three stages as shown in Figures 4 and 7, respectively, and the index value obtained by processing the vibration obtained from the acceleration sensor corresponds to the change with accuracy, and similarly could be classified into stages. In other words, since the acceleration sensor is integrated with the grinding wheel shaft, abnormal vibrations can be directly extracted with higher precision, making it possible to predict and predict clogging with high precision using an extremely simple method.
〈実施例〉
以下本発明の研削砥石の目づまりの検知方法を、その実
施例を示す図面を参酌し乍ら詳述する。<Example> Hereinafter, the method for detecting clogging of a grinding wheel according to the present invention will be described in detail with reference to drawings showing examples thereof.
第１図は本発明方法による研削砥石装置Ａの一実施例を
示す拡散分解斜視図、第２図は同側面説明図、第３図は
同要部詳細説明図である。FIG. 1 is a diffusion exploded perspective view showing one embodiment of a grinding wheel device A according to the method of the present invention, FIG. 2 is an explanatory side view of the same, and FIG. 3 is a detailed explanatory view of the main parts thereof.
即ち砥石（１）の回転軸（２）に、同回転軸（２）のネ
ジ部（３）と螺合するベアリング取付は治具（４）を、
上記回転軸（２）に連結し、更にベアリング取付は治具
（４）にベアリング（５）を外嵌する。このベアリング
（５）上端には、加速度センサー（６）を装着し、更に
固定板（７）を上記ベアリング（５）が飛び出さ無いよ
うに、ベアリング取付は治具（４）他端側に螺着する０
次にビン（８）、（８）は、加速度センサー（６）が回
転しないように、砥石’Ｍ （１）をカバーしているア
クリル板（９）に穴を設け、そこへ上記ビン（８）、（
８）を挿通し、上記加速度センサー（６）をはさむよう
な状態で固定するものである。In other words, the jig (4) is used to install the bearing that is screwed onto the rotating shaft (2) of the grinding wheel (1) and the threaded portion (3) of the same rotating shaft (2).
The bearing is connected to the rotating shaft (2), and the bearing is mounted by externally fitting the bearing (5) onto the jig (4). An acceleration sensor (6) is attached to the upper end of this bearing (5), and the fixing plate (7) is screwed onto the other end of the jig (4) to prevent the bearing (5) from popping out. Arrival 0
Next, in order to prevent the acceleration sensor (6) from rotating, holes are made in the acrylic plate (9) covering the grinding wheel 'M (1), and holes are inserted into the acrylic plate (9) to prevent the acceleration sensor (6) from rotating. ), (
8) and is fixed in such a manner that the acceleration sensor (6) is sandwiched therebetween.
そして静止状態の加速度センサー（６）により得られた
信号を、データレコーダーＢによって指標値に変換′さ
れる。The data recorder B converts the signal obtained by the stationary acceleration sensor (6) into an index value.
なお上記ビン（８）、（８）は防振の目的でゴム等の吸
振材で被覆する。又上記ベアリング取付は治具（４）の
内ネジ及び外ネジは、回転によって外れないように逆ネ
ジとするものである。Note that the bottles (8) and (8) are covered with a vibration absorbing material such as rubber for the purpose of vibration isolation. In addition, in the above-mentioned bearing installation, the inner and outer threads of the jig (4) are reverse-threaded to prevent them from coming off due to rotation.
そこで上記構成の研削砥石装？＆Ａを用いて、２種類（
−へ砥石、Ｃ砥石）の研削砥石によって被研削材料Ａｌ
−５ｉ合金の平面研削を行い比較検討を行なった。So what about the grinding wheel system with the above configuration? &A, two types (
The material to be ground Al by the grinding wheel of
-5i alloy was subjected to surface grinding and a comparative study was conducted.
第４図に−Ａ ４６ＬｍＶ磁石を用いたときの研削抵抗
と研削回数の関係を示す。FIG. 4 shows the relationship between the grinding resistance and the number of times of grinding when using a -A 46LmV magnet.
研削回数を増加させると、目づまりが進行するために、
こするような状態で切削現象が進行し、従って研削抵抗
は水平、垂直方向いずれも増加する、ただし、砥粒切れ
刃と工作物の接触面積は増加するため、水平即ち、切削
方向よりも押し付けるような作用をする垂直方向の力が
大きい、又研削抵抗の変化は水平、垂直方向とも３つの
ステージに分類できる。即ち、研削回数１０回までの第
１ステージ、１０回から８０回までの第２ステージ、８
０回以降の第３ステージである。第１ステージは砥石の
砥粒切れ刃の状態が不安定なので研削抵抗が急増するの
に対し、第２ステージは砥石の砥粒切れ刃の状態が安定
するため研削抵抗はゆるやかな上昇となる。第３ステー
ジは砥石表面の目づまりが著しく成長し、研削抵抗は上
昇する。As the number of grinding increases, clogging progresses, so
The cutting phenomenon progresses in a rubbing state, and therefore the grinding resistance increases both horizontally and vertically. However, since the contact area between the abrasive cutting edge and the workpiece increases, the grinding force is pressed more than horizontally, that is, in the cutting direction. The force acting in the vertical direction is large, and changes in grinding resistance can be classified into three stages in both the horizontal and vertical directions. That is, the first stage has a grinding frequency of up to 10 times, the second stage has a grinding frequency of 10 to 80 times, and a grinding stage of 8 to 80 times.
This is the third stage after 0 times. In the first stage, the state of the abrasive cutting edge of the grindstone is unstable, so the grinding resistance increases rapidly, whereas in the second stage, the state of the abrasive cutting edge of the grindstone is stable, so the grinding resistance increases gradually. In the third stage, the clogging on the surface of the grinding wheel grows significantly, and the grinding resistance increases.
次に、無負荷時の状態と各ステージにおける砥石の加速
度振動の信号を第５図（イ）、（Ｕ）、（ハ）、（ニ）
でそれぞれ示す。Next, Fig. 5 (a), (U), (c), (d) shows the no-load state and the acceleration vibration signals of the grinding wheel at each stage.
are shown respectively.
図中（１）より無負荷時の信号の振幅が、図中（ロ）、
（ハ）、（ニ）で示す研削時の振幅に比べ、非常に小さ
いことが判る。従って無負荷時の信号（ベアリングなど
の振動）は無視できるものとした。又、ＦＦＴによるス
ペクトル解析から研削時の信号における砥石の加速度振
動の周波数帯域を４００〜５ ＫＨｚとして、信号にフ
ィルターをかけＡ／Ｄ変換した後、八〇Ｆにより指標値
として数値化した。この指標値と研削回数の関係を第６
図に示す。From (1) in the figure, the amplitude of the signal at no load is (b) in the figure,
It can be seen that the amplitude is very small compared to the amplitude during grinding shown in (c) and (d). Therefore, the signal (vibration of bearings, etc.) under no load was assumed to be negligible. Further, from the spectrum analysis by FFT, the frequency band of the acceleration vibration of the grindstone in the signal during grinding was set to 400 to 5 KHz, and the signal was filtered and A/D converted, and then quantified as an index value by 80F. The relationship between this index value and the number of grinding times is shown in
As shown in the figure.
即ち指標値の変化も研削抵抗の変化に対応して研削回数
の１０回と８０回を境として３つのステージに分類でき
る。That is, the change in the index value can also be classified into three stages based on the number of grinding times, 10 and 80, corresponding to changes in the grinding resistance.
次にＣ４Ｃ４６Ｊ砥石による研削抵抗と研削回数の関係
を第７図に示す。Next, FIG. 7 shows the relationship between the grinding resistance and the number of grinding times using the C4C46J grindstone.
研削抵抗の変化は−Ａ砥石の場合と同様に３つのステー
ジに分類できる０ｍち、研削回数３０回までの第１ステ
ージ、３０回から２５０回までの第２ステージ、２５０
回以降の第３ステージである。Changes in grinding resistance can be classified into three stages as in the case of the -A grinding wheel: 0m, the first stage with up to 30 grinding times, the second stage with 30 to 250 grinding times, and the second stage with 250 grinding times.
This is the third stage after the first round.
更に無負荷時の状態と各ステージにおける砥石の加速度
振動の信号を、第８図（イ）、（Ｕ）、（幻、（ニ）で
それぞれ示す。Furthermore, the state under no load and the signal of the acceleration vibration of the grindstone at each stage are shown in FIGS.
即ち図中（イ）より無負荷時の信号の振幅が、図中（Ｉ
ｌ＋）、（ハ）、（ニ）の研削時の振幅に比べ非常に小
さいことが判る。従って−Ａ砥石の場合と同様に無負荷
時の信号（ベアリングなどの振動）は無視できるものと
した。In other words, from (A) in the figure, the amplitude of the signal at no load is as shown in (I) in the figure.
It can be seen that the amplitude is very small compared to the amplitude during grinding of (l+), (c), and (d). Therefore, as in the case of the -A grindstone, the signal at no load (vibration of bearings, etc.) was assumed to be negligible.
又ＦＦＴによるスペクトル解析から研削時の信号におけ
る砥石の加速度振動の周波数帯域を４００〜５ ＫＨ２
として、信号にフィルターをかけ、Ａ／Ｄ変換をした後
、八〇Ｆにより指標値として数値化した。Also, from spectrum analysis using FFT, the frequency band of the acceleration vibration of the grinding wheel in the signal during grinding was determined to be 400 to 5 KH2.
After applying a filter to the signal and performing A/D conversion, it was digitized as an index value using 80F.
この指標値と研削回数の関係を第９図に示す０図中にお
いて研削回数３０回と２５０回を境として３つのステー
ジに分けることができ、研削抵抗の変化と対応している
ことが判る。The relationship between this index value and the number of grinding times can be divided into three stages in the diagram 0 shown in FIG. 9, with the number of grinding times of 30 and 250 as boundaries, and it can be seen that this corresponds to the change in grinding resistance.
以上からｌ砥石とＣ砥石も用いて、アルミニウム・シリ
コン合金の研削加工を行った結果、研削砥石に目づまり
を生じた。この時の目づまりによる研削加工の異常振動
を本発明による方法で加速度センサーが確実に検知して
おり、得られた振動をＡＤＦ処理した指標値の変化と目
づまりによる研削抵抗の変化はともに対応して３つのス
テージに分類できることが判った。このことから、研削
時の砥石の目づまりの状態をインプロセスで検知するこ
との有効性は明らかである。As described above, as a result of grinding an aluminum-silicon alloy using the L grindstone and the C grindstone, the grinding wheel became clogged. The acceleration sensor reliably detects the abnormal vibration during grinding due to the clogging at this time using the method of the present invention, and the change in the index value obtained by ADF processing the obtained vibration corresponds to the change in the grinding resistance due to the clogging. It was found that it can be classified into three stages. From this, it is clear that it is effective to detect in-process the state of clogging of the grinding wheel during grinding.
〈発明の効果〉
以上述べて来たように本発明方法では、加速度センサー
を、砥石軸にベアリングを介して取り付けることによっ
て、目づまり状態での異常振動を確実にキャッチし、イ
ンプロセスで精度よく検知することが可能となるもので
ある。<Effects of the Invention> As described above, in the method of the present invention, by attaching an acceleration sensor to the grinding wheel shaft via a bearing, abnormal vibrations caused by clogging can be reliably caught and accurate in-process. This makes it possible to detect.
第１図は本発明方法による研削砥石装置の一実施例を示
す拡散分解斜視図、第２図は同側面説明図、第３図は同
要部詳細説明図、第４図はＷＡ４６Ｌ■Ｖ砥石を用いた
場合の研削抵抗と研削回数の関係を示すグラフ図、第５
図（イ）、（ｒｌ）、（ハ）、（＝）はそれぞれ同無負
荷時と各ステージにおける砥石の加速度振動の信号の振
幅を示すグラフ図、第６図は同指標値と研削回数の関係
を示すグラフ図、第７図はＣ４６ＪｓＶ砥石を用いた場
合の研削抵抗と研削回数の関係を示すグラフ図、第８図
（イ）、（ｔｌ）、（幻、（ニ）はそれぞれ同無負荷時
と各ステージにおける砥石の加速度振動の信号の振幅を
示すグラフ図、第９図は同指標値と研削回数の関係を示
すグラフ図である。
図
中
砥石
回転軸
ベアリング取付は治具
ベアリング
加速度センサーFig. 1 is a diffusion exploded perspective view showing one embodiment of the grinding wheel device according to the method of the present invention, Fig. 2 is an explanatory side view of the same, Fig. 3 is a detailed explanatory view of the main parts, and Fig. 4 is a WA46L V grinding wheel. Graph diagram showing the relationship between grinding resistance and number of grinding when using
Figures (a), (rl), (c), and (=) are graphs showing the amplitude of the signal of the acceleration vibration of the grinding wheel at the same no-load time and at each stage, respectively. Figure 6 shows the index value and the number of grinding times. A graph showing the relationship, Fig. 7 is a graph showing the relationship between grinding resistance and number of grinding when C46JsV grindstone is used, Fig. 8 (a), (tl), (phantom, and (d) are the same and different, respectively) Figure 9 is a graph showing the amplitude of the signal of the acceleration vibration of the grinding wheel under load and at each stage, and Fig. 9 is a graph showing the relationship between the index value and the number of grinding times. sensor
Claims (1)
せしめ、該加速度センサーを所要手段によって常に静止
状態となし、上記加速度センサーによって得られる研削
加工時における目づまりによる異常振動とベアリングの
振動の周波数帯域を分離し、研削砥石の切れ味を示す指
標値に変換せしめたことを特徴とする研削砥石の目づま
りの検知方法。1. An acceleration sensor is attached to the grinding wheel shaft via a bearing, and the acceleration sensor is kept in a stationary state by a necessary means, and the frequency band of abnormal vibration due to clogging during grinding and vibration of the bearing obtained by the acceleration sensor is determined by the above acceleration sensor. A method for detecting clogging of a grinding wheel, characterized in that the information is separated and converted into an index value indicating the sharpness of the grinding wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10627990A JPH048475A (en) | 1990-04-20 | 1990-04-20 | Detecting method of blinding of grinding wheel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10627990A JPH048475A (en) | 1990-04-20 | 1990-04-20 | Detecting method of blinding of grinding wheel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH048475A true JPH048475A (en) | 1992-01-13 |
Family
ID=14429639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10627990A Pending JPH048475A (en) | 1990-04-20 | 1990-04-20 | Detecting method of blinding of grinding wheel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH048475A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020218227A1 (en) * | 2019-04-25 | 2020-10-29 | オムロン株式会社 | Method for determining state of grinding stone and grinding device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0288170A (en) * | 1988-09-22 | 1990-03-28 | Nagase Iron Works Co Ltd | Detecting device for wear of grindstone |
-
1990
- 1990-04-20 JP JP10627990A patent/JPH048475A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0288170A (en) * | 1988-09-22 | 1990-03-28 | Nagase Iron Works Co Ltd | Detecting device for wear of grindstone |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020218227A1 (en) * | 2019-04-25 | 2020-10-29 | オムロン株式会社 | Method for determining state of grinding stone and grinding device |
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