JPH0811362B2 - Grinding wheel contact detection device - Google Patents
Grinding wheel contact detection deviceInfo
- Publication number
- JPH0811362B2 JPH0811362B2 JP62008430A JP843087A JPH0811362B2 JP H0811362 B2 JPH0811362 B2 JP H0811362B2 JP 62008430 A JP62008430 A JP 62008430A JP 843087 A JP843087 A JP 843087A JP H0811362 B2 JPH0811362 B2 JP H0811362B2
- Authority
- JP
- Japan
- Prior art keywords
- grindstone
- drive motor
- operating state
- ground
- torque
- 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 - Lifetime
Links
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- Automatic Control Of Machine Tools (AREA)
- Machine Tool Sensing Apparatuses (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、研削盤の砥石が被研削物もしくはドレッサ
等の被接触物に接触したことを検出する研削盤の砥石接
触検知装置に関するものである。Description: TECHNICAL FIELD The present invention relates to a grindstone wheel contact detection device for a grinder that detects that a grindstone of a grinder has come into contact with an object to be ground or a contact object such as a dresser. is there.
（従来技術） 研削盤により研削される被研削物の前加工精度が悪く
被研削面が均一でない場合には、研削の初期段階におい
て砥石に過大な負荷が作用し、砥石が早期に摩耗し易い
という問題がある。このため、従来は例えば実開昭49−
147691号公報に示されるように、被研削物の研削段階に
応じて駆動電力を制御したり、あるいは砥石の切込み速
度を制御したりすることが行なわれている。(Prior art) If the pre-processing accuracy of the object to be ground by the grinder is poor and the surface to be ground is not uniform, an excessive load acts on the grindstone in the initial stage of grinding and the grindstone is likely to wear early. There is a problem. For this reason, in the past, for example,
As disclosed in Japanese Patent Publication No. 147691, the drive power is controlled or the cutting speed of the grindstone is controlled according to the grinding stage of the object to be ground.
ところで上記のように被研削物の研削段階に応じた制
御を行なうには砥石による研削開始時点を正確に検出す
る必要がある。このため、例えば特開昭51−72796号公
報に示されるように、砥石が被研削物に接触した時点で
生じる砥石駆動モータの消費電力の上昇状態を検出した
り、あるいは特開昭59−59348号公報に示されるよう
に、砥石が被研削物に接触することにより発生する微少
振動を検出したりする等の手段で、研削開始時点を検知
することが行なわれている。しかし、前者の構成では、
砥石駆動モータの定格に応じて上記接触時の電力上昇量
およびその電力検出値のノイズレベルが変化し、上記モ
ータの定格が大きい場合には検出信号のSN化（信号対雑
音比）が低下するため、誤検出が発生し易いという問題
がある。また、後者の構成では、上記振動を検出するた
めに使用される装置が高価であるとともに、この検出装
置に他の振動源から振動が入力されると誤検出が生じる
のでこれを防止するように構成しなければならなかっ
た。By the way, in order to perform the control according to the grinding stage of the object to be ground as described above, it is necessary to accurately detect the time when the grinding by the grindstone is started. Therefore, as disclosed in, for example, Japanese Patent Laid-Open No. 51-72796, it is possible to detect an increase in the power consumption of the grindstone drive motor that occurs when the grindstone comes into contact with the object to be ground, or Japanese Patent Laid-Open No. 59-59348. As disclosed in Japanese Patent Laid-Open Publication No. JP-A-2003-163, the starting point of grinding is detected by a means such as detecting a minute vibration generated when a grindstone comes into contact with an object to be ground. However, in the former configuration,
The amount of power increase at the time of contact and the noise level of the detected power value change according to the rating of the grinding wheel drive motor, and if the motor rating is large, the SN conversion of the detection signal (signal-to-noise ratio) decreases. Therefore, there is a problem that erroneous detection is likely to occur. Further, in the latter configuration, the device used to detect the vibration is expensive, and erroneous detection occurs when vibration is input to this detection device from another vibration source, so it is necessary to prevent this. Had to configure.
また、研削盤の砥石をドレッサにより目立てする場合
には、上記ドレッサによる砥石のドレス量を適正に制御
してドレス量過多による砥石の早期消耗等を防止するた
め、砥石がドレッサに接触した時点を正確に検出し、こ
れに応じてドレス量の制御を適正に行なう必要がある。
このため、簡単な構成で研削盤の砥石が被研削物もしく
はドレッサ等の被接触物に接触した時点を正確に検出す
ることができる砥石接触検知装置の開発が望まれてい
た。Further, when dressing the grindstone of the grinder with a dresser, in order to prevent early wear of the grindstone due to excessive dressing by properly controlling the dressing amount of the grindstone by the dresser, the time when the grindstone contacts the dresser It is necessary to accurately detect and appropriately control the amount of dress according to this.
Therefore, it has been desired to develop a grindstone contact detection device that can accurately detect the time when the grindstone of the grinder comes into contact with an object to be ground or a contacted object such as a dresser with a simple configuration.
（発明の目的） 本発明は、上記の技術背景のものになされたものであ
り、砥石駆動モータとして定格の大きなものを使用した
場合および他の振動源から振動が入力される場合におい
ても、誤検出を生じることなく、砥石が被接触物に接触
した時点を正確に検出することができるとともに、装置
の構成を簡略化して安価に製造することができる研削盤
の砥石接触検知装置を提供するものである。(Object of the Invention) The present invention has been made in view of the above technical background, and is erroneous even when a large-rated grindstone drive motor is used or when vibration is input from another vibration source. To provide a grindstone contact detection device for a grinding machine, which can accurately detect the time when the grindstone comes into contact with an object to be contacted without causing detection, and can be manufactured at low cost by simplifying the configuration of the device. Is.
（発明の構成） 本発明は、研削盤の砥石が被研削物等の被接触物に接
触したことを検出する砥石接触検知装置であって、砥石
を回転駆動する砥石駆動モータと、この砥石駆動モータ
の駆動トルクの大きさを調節するトルク調節手段と、上
記砥石駆動モータの作動状態を検出する作動状態検出手
段と、この作動状態検出手段から出力された検出信号に
応じて上記砥石が被接触物に接触したことを検出すると
ともに、これに応じて上記砥石駆動モータを低トルク運
転状態から高トルク運転状態に切換える制御信号を上記
トルク調節手段に出力する制御手段とを設けたものであ
る。(Structure of the Invention) The present invention is a grindstone contact detection device that detects that a grindstone of a grinder has come into contact with an object to be ground, such as a grindstone, and a grindstone drive motor that rotationally drives the grindstone, and this grindstone drive. Torque adjusting means for adjusting the magnitude of the drive torque of the motor, operating state detecting means for detecting the operating state of the grindstone drive motor, and the grindstone to be contacted according to the detection signal output from the operating state detecting means Control means is provided for detecting contact with an object and for outputting a control signal for switching the grindstone drive motor from a low torque operating state to a high torque operating state to the torque adjusting means in response to the detection.
上記の構成によれば、砥石が被研削物に接触するまで
の間は砥石駆動モータが低トルク運転状態に設定され、
上記砥石が被研削物に接触したことが作動状態検出手段
からの検出信号に応じて検出された後に、上記砥石駆動
モータが高トルク運転状態に切換えられる。この結果、
上記砥石が被接触物に接触することによって砥石駆動モ
ータの作動状態が大きく変化するため、上記砥石の接触
時点の正確かつ迅速な検出が可能となり、また上記接触
が検出された後には砥石駆動モータが高トルク運転状態
に切換えられることによって砥石駆動モータの回転状態
が安定することとなる。According to the above configuration, the grindstone drive motor is set to a low torque operation state until the grindstone contacts the object to be ground,
After the contact of the grindstone with the object to be ground is detected according to the detection signal from the operation state detecting means, the grindstone drive motor is switched to the high torque operating state. As a result,
Since the operating state of the grindstone drive motor changes significantly due to the grindstone contacting the contacted object, it is possible to accurately and quickly detect the contact point of the grindstone, and after the contact is detected, the grindstone drive motor can be detected. Is switched to the high torque operating state, the rotation state of the grindstone drive motor is stabilized.
（実施例） 第１図において、１は円筒体からなる被研削物、２は
この被研削物１の内周面を研削する砥石、３はこの砥石
２を回転駆動する砥石駆動モータである。この砥石駆動
モータ３は砥石台４上に取付けられ、この砥石台４とと
もに図外のスライド機構によってスライド移動されるこ
とにより、上記被研削物１に対して所定の切込み動作を
行なうように構成されている。(Embodiment) In FIG. 1, 1 is an object to be ground consisting of a cylindrical body, 2 is a grindstone for grinding the inner peripheral surface of the object to be ground 1, and 3 is a grindstone drive motor for rotationally driving the grindstone 2. This grindstone drive motor 3 is mounted on a grindstone base 4, and is configured to perform a predetermined cutting operation on the work 1 by sliding with the grindstone base 4 by a slide mechanism (not shown). ing.
上記砥石駆動モータ３は、モータ駆動部５から出力さ
れる制御信号に応じて作動状態が制御されるとともに、
このモータ駆動部５内に設けられたトルク調節手段６か
ら出力される制御信号に応じて砥石駆動モータ３の電機
子電圧が制御される等により、駆動トルクが少なくとも
高低２段に切換えられるように構成されている。また、
上記砥石駆動モータ３の消費電力もしくは回転数等の作
動状態が作動状態検出手段７において検出され、この検
出信号が制御手段８の基準値設定手段９および比較器10
に出力されるようになっている。The operating state of the grindstone drive motor 3 is controlled according to a control signal output from the motor drive unit 5, and
By controlling the armature voltage of the grindstone drive motor 3 according to a control signal output from the torque adjusting means 6 provided in the motor drive unit 5, the drive torque can be switched between at least two high and low stages. It is configured. Also,
An operating state such as power consumption or the number of revolutions of the grindstone driving motor 3 is detected by the operating state detecting means 7, and the detection signal is the reference value setting means 9 of the control means 8 and the comparator 10.
It is designed to be output to.
上記基準値設定手段９は、砥石駆動モータ３が研削開
始前の無負荷運転状態から研削開始後の負荷運転状態に
変化したことを判別するための基準値を比較器10に出力
するものである。上記基準値は、砥石駆動モータ３が低
トルク無負荷運転状態にある場合に上記検出手段７にお
いて検出された作動状態検出値と、この検出信号のノイ
ズレベルよりも大きな値に予め設定された所定の設定値
とに応じて基準値設定手段９において演算された後、記
憶される。そして上記制御手段８は、上記基準値と、作
動状態検出手段７から逐次検出される検出値とを比較器
10において比較し、その比較結果に応じて砥石２が被研
削物１に接触したか否かを判定するとともに、この判定
結果に応じて砥石２が被研削物１に接触したことが検出
された時点で、上記砥石駆動モータ３を低トルク運転状
態から高トルク運転状態に切換える制御信号を上記比較
器10からトルク調節手段６に出力するように構成されて
いる。The reference value setting means 9 outputs a reference value to the comparator 10 for determining that the grindstone drive motor 3 has changed from the no-load operation state before the start of grinding to the load operation state after the start of grinding. . The reference value is set in advance to a value larger than the operating state detection value detected by the detection means 7 when the grindstone drive motor 3 is in the low torque no-load operation state and a noise level of this detection signal. The calculated value is stored in the reference value setting means 9 after being calculated according to the set value. Then, the control means 8 compares the reference value with the detection value sequentially detected by the operating state detection means 7.
The comparison was made in 10, and it was determined whether or not the grindstone 2 was in contact with the object to be ground 1 according to the comparison result, and it was detected that the grindstone 2 was in contact with the object to be ground 1 in accordance with this determination result. At this time, the control signal for switching the grindstone driving motor 3 from the low torque operating state to the high torque operating state is output from the comparator 10 to the torque adjusting means 6.
以上のような構成において、砥石２が被研削物１に接
触したことを検知するとともに、所定の研削作業を行な
う場合の制御動作を第２図に示すフローチャートに基づ
いて説明する。まず、研削盤の電源スイッチが投入され
て制御動作がスタートすると、ステップS1において砥石
駆動モータ３を始動して低トルク運転を行なう。次い
で、ステップS2において低トルク無負荷運転状態にある
砥石駆動モータ３の消費電力に応じた作動状態検出値を
基準値設定手段９に入力した後、ステップS3において上
記作動状態検出値と所定の設定値とに応じて基準値を演
算し、これを記憶する。With the above-mentioned configuration, the control operation for detecting the contact of the grindstone 2 with the object 1 to be ground and performing a predetermined grinding operation will be described based on the flowchart shown in FIG. First, when the power switch of the grinder is turned on and the control operation is started, the grindstone drive motor 3 is started in step S 1 to perform low torque operation. Then, after you type in the reference value setting means 9 the operating state detection value corresponding to the power consumption of the grinding wheel driving motor 3 in a low torque idling state in step S 2, the operating state detection value in step S 3 and a predetermined The reference value is calculated according to the set value of and is stored.
次に、ステップS4において上記スライド機構を作動さ
せ、砥石台４をスライド移動させることにより、切込み
動作を開始する。その後、ステップS5において上記砥石
駆動モータ３の作動状態検出値を逐次上記比較器10に入
力するとともに、ステップS6において上記検出値と基準
値とを比較することにより、砥石２が被研削物１の研削
面に接触したか否かを判定する。すなわち、上記砥石２
が被研削物１に接触して砥石駆動モータ３に負荷が作用
すると、この砥石駆動モータ３の消費電力が増大する等
の作動状態の変化が生じるため、この変化量が所定の設
定値よりも大きくなったことが上記ステップS6において
確認された時点を砥石２の接触開始時点を見なすように
している。Next, in step S 4 , the slide mechanism is operated to slide the grindstone base 4 to start the cutting operation. After that, in step S 5 , the operating state detection value of the grindstone drive motor 3 is sequentially input to the comparator 10, and in step S 6 , the detection value is compared with the reference value, so that the grindstone 2 is ground. It is determined whether or not the ground surface of No. 1 is contacted. That is, the grindstone 2
When the tool contacts the object to be ground 1 and a load is applied to the grindstone drive motor 3, a change in the operating state occurs, such as an increase in the power consumption of the grindstone drive motor 3. Therefore, this amount of change is greater than a predetermined set value. The point of time when it is confirmed in step S 6 that the size of the wheel has increased is regarded as the point of time when the contact of the grindstone 2 starts.
そして、上記ステップS6で砥石２が被研削物１の研削
面に接触したことが確認されると、ステップS7において
砥石駆動モータ３を低トルク運転状態から高トルク運転
状態に切換える制御信号を上記制御手段８の比較器10か
らモータ駆動部５のトルク調節手段６に出力して砥石駆
動モータ３を高トルク運転状態とする。次いでステップ
S8において、予め設定されたプログラムに基づいて砥石
２により被研削物１を研削する研削制御を実行した後、
制御動作を終了する。Then, when it is confirmed that the grindstone 2 comes into contact with the ground surface of the object to be ground 1 in step S 6 , a control signal for switching the grindstone driving motor 3 from the low torque operating state to the high torque operating state is sent in step S 7 . The comparator 10 of the control means 8 outputs the torque to the torque adjusting means 6 of the motor drive section 5 to bring the grindstone drive motor 3 into a high torque operating state. Then step
In S 8, after performing the grinding control for grinding the object to be ground 1 by grindstone 2 based on a preset program,
The control operation ends.
このように砥石駆動モータ３の駆動トルクを少なくと
も高低２段に切換可能に構成し、制御動作がスタートし
た時点から制御手段８において砥石２が被研削物１に接
触したと判定されるまでの間は、上記砥石駆動モータ３
を低トルク状態で作動させるようにしたため、砥石２が
被研削物１に当接し始めた時点で作用する微少な負荷変
動によっても砥石駆動モータ３の作動状態が顕著に変化
することとなる。したがって、上記砥石駆動モータ３と
して定格の大きいモータを用いた場合においても、上記
制御手段８の比較器10に出力される検出信号のレベル
と、ノイズレベルとの比、つまりSN比が向上するため、
ノイズによる誤検出が減少して上記砥石２の接触時点を
正確かつ迅速に検出することができる。In this way, the drive torque of the grindstone drive motor 3 is configured to be switchable between at least two stages of high and low, and from the time when the control operation starts to the time when the control means 8 determines that the grindstone 2 has come into contact with the workpiece 1. Is the grindstone drive motor 3
Is operated in a low torque state, the operating state of the grindstone drive motor 3 is remarkably changed even by a minute load fluctuation that acts when the grindstone 2 starts contacting the workpiece 1. Therefore, even when a motor having a large rating is used as the grindstone drive motor 3, the ratio of the detection signal output to the comparator 10 of the control means 8 and the noise level, that is, the SN ratio is improved. ,
Erroneous detection due to noise is reduced, and the contact point of the grindstone 2 can be detected accurately and quickly.
この結果、上記砥石２が被研削物１に接触するまでは
砥石台４の送り速度を高速とし、その後に研削に適した
所定の送り速度に低下させたり、被研削物１の研削段階
に応じて砥石駆動モータ３の駆動電力を調節する等の制
御を適正に行なうことができる。また、上記制御手段８
において砥石２が被研削物１に接触したことが検出され
た時点で、砥石駆動モータ３が低トルク運転状態から高
トルク運転状態に切換えられるため、砥石２により被研
削物１の研削を行なう場合には砥石駆動モータ３の能力
を充分に発揮させて安定した研削状態を得ることができ
る。As a result, the feed speed of the grindstone base 4 is increased until the grindstone 2 comes into contact with the object 1 to be ground, and thereafter, the feed speed is reduced to a predetermined feed speed suitable for grinding, or depending on the grinding stage of the object 1 to be ground. Therefore, control such as adjusting the drive power of the grindstone drive motor 3 can be appropriately performed. In addition, the control means 8
In the case where the grindstone 2 is used to grind the grindstone 1 because the grindstone driving motor 3 is switched from the low torque operation state to the high torque operation state when it is detected that the grindstone 2 contacts the grindstone 1 in Therefore, the ability of the grindstone drive motor 3 can be fully exerted to obtain a stable grinding state.
なお、上記実施例では研削盤の砥石２が被研削物に接
触したことを検出する接触検知装置について説明した
が、上記砥石２が目直し用のドレッサに接触したことを
検出する接触検知装置としても本発明の構成を採用する
ことができる。In the above embodiment, the contact detecting device for detecting the contact of the grindstone 2 of the grinder with the object to be ground has been described. However, as the contact detecting device for detecting the contact of the grindstone 2 with the dressing dressing tool for dressing. Also, the configuration of the present invention can be adopted.
（発明の効果） 以上説明したように本発明は、研削盤の砥石を回転駆
動する砥石駆動モータの駆動トルクの大きさを調節する
トルク調節手段を設けるとともに、上記砥石駆動モータ
の作動状態を検出する作動状態検出手段からの検出信号
に応じて上記砥石が被研削物に接触したことが検出され
るまでの間、上記砥石駆動モータを低トルク運転状態と
し、その後にこの砥石駆動モータを高トルク運転状態に
切換える制御手段を設けたため、上記砥石駆動モータと
して定格の大きいものを用いた場合においても、ノイズ
による誤検出を生じることなく上記砥石が被研削物に接
触したことを正確かつ迅速に検出することができる。(Effects of the Invention) As described above, the present invention is provided with the torque adjusting means for adjusting the magnitude of the drive torque of the grindstone drive motor that rotationally drives the grindstone of the grinder, and detects the operating state of the grindstone drive motor. The grindstone drive motor is brought into a low torque operating state until it is detected that the grindstone comes into contact with the object to be ground in accordance with the detection signal from the operating state detecting means, and thereafter the grindstone drive motor is driven to a high torque. Since the control means for switching to the operating state is provided, even when using a large rated grindstone drive motor, it is possible to accurately and quickly detect that the grindstone has contacted the object to be ground without causing false detection due to noise. can do.
また、上記砥石が被研削物に接触した時点で発生する
振動を検出することにより、接触時点を検知するように
構成された従来装置のように、他の振動源を考慮する必
要はなく、しかも上記従来装置に比べて検出手段の構成
を簡略化して製造コストを安価に抑えることができると
いう利点がある。Further, by detecting the vibration generated when the grindstone comes into contact with the object to be ground, it is not necessary to consider other vibration sources, unlike the conventional device configured to detect the contact time, and Compared with the above-mentioned conventional device, there is an advantage that the structure of the detecting means can be simplified and the manufacturing cost can be kept low.
第１図は本発明の実施例を示す概略説明図、第２図は本
発明に係る検知装置の制御動作を示すフローチャートで
ある。 １……被研削物（被接触物）、２……砥石、３……砥石
駆動モータ、６……トルク調節手段、７……作動状態検
出手段、８……制御手段。FIG. 1 is a schematic explanatory view showing an embodiment of the present invention, and FIG. 2 is a flow chart showing a control operation of a detection device according to the present invention. 1 ... Object to be ground (object to be contacted), 2 ... Grindstone, 3 ... Grindstone drive motor, 6 ... Torque adjusting means, 7 ... Operating state detecting means, 8 ... Control means.
Claims (1)
触したことを検出する砥石接触検知装置であって、砥石
を回転駆動する砥石駆動モータと、この砥石駆動モータ
の駆動トルクの大きさを調節するトルク調節手段と、上
記砥石駆動モータの作動状態を検出する作動状態検出手
段と、この作動状態検出手段から出力された検出信号に
応じて上記砥石が被接触物に接触したことを検出すると
ともに、これに応じて上記砥石駆動モータを低トルク運
転状態から高トルク運転状態に切換える制御信号を上記
トルク調節手段に出力する制御手段とを設けたことを特
徴とする研削盤の砥石接触検知装置。1. A grindstone contact detection device for detecting that a grindstone of a grinder has come into contact with an object to be ground such as an object to be ground, and a grindstone drive motor for rotationally driving the grindstone, and a drive torque of the grindstone drive motor. Torque adjusting means for adjusting the size of the grinding wheel, an operating state detecting means for detecting the operating state of the grindstone drive motor, and the grindstone contacting the contacted object according to the detection signal output from the operating state detecting means. And a control means for outputting a control signal for switching the grindstone drive motor from a low-torque operating state to a high-torque operating state to the torque adjusting means accordingly. Wheel contact detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62008430A JPH0811362B2 (en) | 1987-01-16 | 1987-01-16 | Grinding wheel contact detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62008430A JPH0811362B2 (en) | 1987-01-16 | 1987-01-16 | Grinding wheel contact detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63174874A JPS63174874A (en) | 1988-07-19 |
| JPH0811362B2 true JPH0811362B2 (en) | 1996-02-07 |
Family
ID=11692906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62008430A Expired - Lifetime JPH0811362B2 (en) | 1987-01-16 | 1987-01-16 | Grinding wheel contact detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0811362B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012148352A (en) * | 2011-01-17 | 2012-08-09 | Mitsubishi Heavy Ind Ltd | Phase adjustment device and method for gear grinding machine |
| CN105729273A (en) * | 2016-03-27 | 2016-07-06 | 钱友静 | Low-noise carving device of stone carving machine |
-
1987
- 1987-01-16 JP JP62008430A patent/JPH0811362B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63174874A (en) | 1988-07-19 |
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