JPH01188252A - Compensation for tool abrasion in nc machine tool - Google Patents
Compensation for tool abrasion in nc machine toolInfo
- Publication number
- JPH01188252A JPH01188252A JP1028088A JP1028088A JPH01188252A JP H01188252 A JPH01188252 A JP H01188252A JP 1028088 A JP1028088 A JP 1028088A JP 1028088 A JP1028088 A JP 1028088A JP H01188252 A JPH01188252 A JP H01188252A
- Authority
- JP
- Japan
- Prior art keywords
- tool
- grinding
- shape
- abrasion
- machining
- 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
- 238000005299 abrasion Methods 0.000 title abstract 6
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000003754 machining Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 18
- 230000002265 prevention Effects 0.000 claims 1
- 239000000725 suspension Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
Landscapes
- Automatic Control Of Machine Tools (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は数値制御工作機械の使用に伴い発生する工具摩
耗を自動的に補償する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for automatically compensating for tool wear that occurs with the use of numerically controlled machine tools.
（従来の技術）
第７図は従来の数値制御工作機械において工具摩耗が発
生した場合の対処をフローチャートで示したものである
。すなわち、切削抵抗等の加工現象の変化を検出して加
工を中断し、あるいは一定量の加工を行う毎にいったん
加工を中断し、その状態で工具の摩耗状態の測定を行い
、その時点で工具が摩耗限界に達していれば第７図（イ
）に示す例のようにアラームを発生させ、加工を停止し
て工具の交換が行われるまで待機し、あるいは（ロ）に
示す例のように工具交換指令を出力して工具を交換した
後に加工を再開するといった方法がとられていた。(Prior Art) FIG. 7 is a flowchart showing how to deal with tool wear when tool wear occurs in a conventional numerically controlled machine tool. In other words, machining is interrupted by detecting changes in machining phenomena such as cutting resistance, or machining is temporarily interrupted every time a certain amount of machining is performed, and the wear state of the tool is measured in that state. If the tool has reached the wear limit, an alarm will be generated as in the example shown in Figure 7 (a), machining will be stopped and the tool will wait until the tool is replaced, or as in the example shown in (b). The conventional method was to output a tool change command and restart machining after changing the tool.
（発明が解決しようとする課ｗｉ）
しかしながら、上記のように工具が摩耗限界に達する度
に工具交換をしていたのでは工具本数が多量に必要とな
り、更に自動工具交換装置を持たない数値制御工作機械
では、加工停止後にマニュアルで工具を交換し、再度、
工具のセツティングを行うことが必要であることから、
連続加工の妨げとなるといった問題があった。(Problem to be solved by the invention wi) However, if the tool was replaced every time the tool reached its wear limit as described above, a large number of tools would be required, and furthermore, numerical control without an automatic tool changer would require a large number of tools. With machine tools, after stopping machining, the tool is manually replaced and then restarted.
Since it is necessary to set the tool,
There was a problem that it interfered with continuous processing.
本発明は上記の点に鑑み提案されたものであり、その目
的とするところは、主として、■数値制御工作機械の工
具交換のために用意する工具本数の削減
■自動工具交換装置を持たない数値制御工作機械の稼動
効率の向上
を図ることにある。The present invention has been proposed in view of the above points, and its main objectives are: - Reduction of the number of tools prepared for tool exchange in numerically controlled machine tools; The purpose is to improve the operating efficiency of controlled machine tools.
（課題を解決するための手段）
上記の目的を達成するため、本発明は、工具先端の外径
、長さ等の形状値を予め設定した形状値と比較して工具
摩耗によ□る工具研削要否を判定する工程と、工具研削
要と判定した際に工具先端を所定の形状に加工する工程
と、加工後に工具先端形状値のうち少なくとも長さを測
定する工程と、この測定結果に基づいて工具位置を補正
する工程とからなることを特徴とする数値制御工作機械
の工具摩耗の補償方法を要旨としている。(Means for Solving the Problems) In order to achieve the above object, the present invention compares shape values such as the outer diameter and length of the tool tip with preset shape values to prevent tool wear. A process of determining whether or not grinding is necessary; a process of machining the tool tip into a predetermined shape when it is determined that tool grinding is necessary; a process of measuring at least the length of the tool tip shape value after machining; The gist of this paper is a method for compensating for tool wear in a numerically controlled machine tool, which is characterized by comprising a step of correcting the tool position based on the method.
（作用）
本発明の数値制御工作機械の工具摩耗の補償方法にあっ
ては、工具が摩耗限界に達した際に、その工具を即座に
交換するのではなく、とぎ直しをして再び使用するため
、交換のために用意する工具本数を大幅に減少させるこ
とができると共に、工具を有効に利用する乙とができる
。(Function) In the method of compensating for tool wear in a numerically controlled machine tool of the present invention, when a tool reaches its wear limit, the tool is not immediately replaced but is resharpened and used again. Therefore, the number of tools prepared for replacement can be significantly reduced, and the tools can be used effectively.
また、工具自動交換装置を持たない数値制御工作機械に
おいてもマニュアルによる工具交換の回数が少なくなる
ため、稼動効率を高めることができろ。更に、とぎ直し
後に工具の形状を測定して工具位置を補正するため、加
工精度を悪化させることはなく、加工物の高精度化が図
れる。In addition, even in numerically controlled machine tools that do not have an automatic tool changer, the number of manual tool changes will be reduced, which will improve operating efficiency. Furthermore, since the shape of the tool is measured after resharpening and the tool position is corrected, the machining accuracy is not deteriorated and the precision of the workpiece can be improved.
（実施例） 以下、実施例を示す図面に沿って本発明を詳述する。(Example) Hereinafter, the present invention will be described in detail with reference to the drawings showing examples.
第１図は本発明の数値制御工作機械の工具摩耗の補償方
法の工程をフローチャートで示したものである。また、
第２図は本発明を門形マシニングセンタ１に適用した実
施例であり、２はＮＣ装置、３は主軸部、４はエンドミ
ルの如き工具、５は加工の対象となるワーク、６は工具
４の切れ刃の位置の割り出しを行う測定子、７は工具４
の形状を測定するセンサ、８は工具４の切れ刃を研削す
るための砥石である。FIG. 1 is a flowchart showing the steps of a method for compensating for tool wear in a numerically controlled machine tool according to the present invention. Also,
FIG. 2 shows an embodiment in which the present invention is applied to a double-column machining center 1, in which 2 is an NC device, 3 is a main spindle, 4 is a tool such as an end mill, 5 is a workpiece to be machined, and 6 is a tool 4. 7 is the tool 4, which measures the position of the cutting edge.
8 is a grindstone for grinding the cutting edge of the tool 4.
第１図および第２図において、稼動中の数値制御工作機
械はある一定量の加工を終えろと加工中断の指令を受は
取り、加工を中断する（ステップ１００）。なお、ここ
でいう加工中断とは、ＮＣデータ上で自動的に運転を止
める場合と、工具摩耗をチエツクするためにマニュアル
操作で運転を止める場合とを含む。In FIGS. 1 and 2, the numerically controlled machine tool in operation receives a command to interrupt machining to complete a certain amount of machining, and interrupts machining (step 100). Note that machining interruption here includes cases in which operation is automatically stopped based on NC data and cases in which operation is stopped manually in order to check tool wear.
加工を中断した後、主軸部３は機械の動作範囲内にある
計測機部（センサ７）へ移動しくステップ１０１）、工
具４の先端部の形状の測定を開始する。具体的には、第
３図（（ロ）は（イ）の底面図）に示す例のように、先
ず測定子６を用いて工具４の先端部の切れ刃の位置の割
り出しを行い（ステップ１０２）、その時の主軸回転角
度を制御装置に記憶させる。次に、第４図に示すように
プランジャタイプ等のセンサ７で工具４の外径および長
さを計測しくステップ１０３）、予め入力または測定し
て記憶させておいた工具形状値との比較を行い（ステッ
プ１０４）、工具摩耗量の検出を行う。After interrupting the machining, the main shaft section 3 moves to the measuring device section (sensor 7) within the operating range of the machine (step 101), and starts measuring the shape of the tip of the tool 4. Specifically, as shown in the example shown in FIG. 3 ((B) is a bottom view of (A)), first, the position of the cutting edge at the tip of the tool 4 is determined using the probe 6 (step 102), the main shaft rotation angle at that time is stored in the control device. Next, as shown in Fig. 4, the outer diameter and length of the tool 4 are measured using a sensor 7 such as a plunger type (Step 103), and compared with the tool shape values that have been input or measured and stored in advance. (step 104), and the amount of tool wear is detected.
ここで、検出された工具摩耗量が、予め設定しである工
具材質、形状加工条件等の組み合わせからなる許容工具
摩耗基準値内にあるかどうかの判別を行い（ステップ１
０５）、もし基準値内であれば加工を中断した点に戻り
（ステップ１１１）、加工を再開する（ステップ１１２
）。Here, it is determined whether the detected tool wear amount is within the allowable tool wear reference value, which is a preset combination of tool material, shape machining conditions, etc. (Step 1)
05), if it is within the reference value, return to the point where machining was interrupted (step 111) and restart machining (step 112).
).
これに対して、工具摩耗量が基準値を超えていれば、工
具研削要の信号を出力する。そして、工具研削要となれ
ば、主軸部３は計測機部と同じく機械の動作範囲内に取
り付けである工具研削機部（砥石８）に移動しくステッ
プ１０６）、工具４を所定の形状に研削する（ステップ
１０７）。なお、工具４の研削の詳細については後述す
る。On the other hand, if the amount of tool wear exceeds the reference value, a signal indicating that tool grinding is required is output. Then, when it becomes necessary to grind the tool, the spindle section 3 is moved to the tool grinder section (grindstone 8), which is installed within the operating range of the machine like the measuring instrument section (step 106), and the tool 4 is ground into a predetermined shape. (Step 107). Note that details of the grinding of the tool 4 will be described later.
研削加工が終了した後、工具４を再び計測機部へ移動さ
せ（ステップ１０８）、前述のステップ１０３と同様の
方法で工具４の先端形状値のうち少なくとも長さの測定
を行う（ステップ１０９）。次に、予め入力または測定
して記憶させてあった当初の工具形状値との比較を行っ
て工具減寸量の算出を行い、その寸法だけ工具のセツテ
ィング位置の補正を行う（ステップ１１０）。そして、
最後に再び加工を中断した点に戻り（ステップ１１１）
、加工の再開をする（ステップ１１２）。After the grinding process is completed, the tool 4 is moved to the measuring device section again (step 108), and at least the length of the tip shape value of the tool 4 is measured in the same manner as in step 103 described above (step 109). . Next, the amount of tool reduction is calculated by comparing it with the original tool shape value that has been input or measured and stored in advance, and the tool setting position is corrected by that dimension (step 110). . and,
Finally, return to the point where machining was interrupted (step 111)
, restarts machining (step 112).
上述のような工程で、摩耗した工具４の測定。Measurement of the worn tool 4 in the process described above.
研削加工を行い、工具４を加工前の状態にし、工具摩耗
の補償を行った後、加工を再開するというのが本発明の
主たる内容である。The main content of the present invention is to carry out the grinding process, bring the tool 4 into a pre-processing state, compensate for tool wear, and then restart the process.
次に、上記のステップ１０７における工具研削機部の動
作について説明を行う。第５図は工具研削機部の砥石８
近辺を示したものであり、この工具研削機部は砥石回転
軸傾き角度θが可変となっており、工具４の底刃形状か
ら角度θが決定され、同時に砥石８上での工具４の加工
位置も求めることができる。これは従来の工具研削盤の
ように工具のチャッキング部分を二軸回転させて研削す
る方法に比べ、砥石回転軸を一軸傾けるだけでよいので
、簡便になしうるものである。Next, the operation of the tool grinder section in step 107 will be explained. Figure 5 shows the grinding wheel 8 of the tool grinding machine section.
The inclination angle θ of the grinding wheel rotation axis is variable in this tool grinding machine, and the angle θ is determined from the shape of the bottom edge of the tool 4, and at the same time, the machining of the tool 4 on the grinding wheel 8. You can also find the location. This can be done more easily than in a conventional tool grinder, in which the chucking part of the tool is rotated on two axes for grinding, since it is only necessary to tilt the grindstone rotation axis on one axis.
なお、第５図における角度θ、ψは、第６図（イ）の工
具４の正面図に示す底刃中低角（底刃スカシ角）ψ１、
および（ロ）の側面図に示す底刃二番角（底刃逃げ角）
ψ２を用いると、次式で表わされる。Incidentally, the angles θ and ψ in FIG. 5 are the bottom edge mid-low angle (bottom edge cutout angle) ψ1, shown in the front view of the tool 4 in FIG.
The second bottom edge angle (bottom edge relief angle) shown in the side view of and (b)
Using ψ2, it is expressed by the following equation.
しかして、角度θと工具４の加工位置とが決定された後
、前述の測定子６によって割り出された切れ刃の位置お
よび予め測定しである砥石上面の位置情報を基に、工具
４の底切れ刃の延長線が砥石回転軸中心に一致するよう
に主軸部３を回転させ、Ｚ軸で切り込みを、ＸＹで送り
運動を与えて、工具４の底刃中低角および底刃二番角を
同時に研削加工する。そして、−刀の研削加工が終了し
た後、予め入力しである刃の枚数に合うように、主軸部
３の回転および研削加工を順次繰り返して行く。また、
もし必要であれば砥石８を９０″傾けて工具側刃の研削
を行うようにしてもよい。After the angle θ and the machining position of the tool 4 are determined, the position of the tool 4 is determined based on the position of the cutting edge determined by the measuring element 6 and the position information of the upper surface of the grinding wheel measured in advance. The main shaft part 3 is rotated so that the extension line of the bottom cutting edge coincides with the center of the whetstone rotation axis, and the Z-axis makes a cut and the XY gives a feed motion, and the bottom edge of the tool 4 is cut at a medium-low angle and a second bottom edge. Grind the corners at the same time. Then, after the grinding of the sword is completed, the rotation and grinding of the main shaft portion 3 are sequentially repeated to match the number of blades inputted in advance. Also,
If necessary, the grindstone 8 may be tilted 90'' to grind the tool side edge.
（発明の効果）
以上のように本発明の数値制御工作機械の工具摩耗の補
償方法にあっては、工具先端の外径。(Effects of the Invention) As described above, in the method of compensating for tool wear in a numerically controlled machine tool of the present invention, the outer diameter of the tool tip.
長さ等の形状値を予め設定した形状値と比較して工具摩
耗による工具研削要否を判定する工程と、工具研削要と
判定した際に工具先端を所定の形状に加工する工程と、
加工後に工具先端形状値のうち少なくとも長さを測定す
る工程と、この測定結果に基づいて工具位置を補正する
工程とからなるので、
■工具交換のために用意する工具本数の減少■工具１本
あたりの切削可能体積の増大■工具摩耗補償による加工
物の高精度化■工具自動交換装置を持たない数値制御工
作機械における連続稼動時間の増大
等が図れる効果がある。A step of comparing shape values such as length with preset shape values to determine whether or not tool grinding is necessary due to tool wear, and a step of machining the tool tip into a predetermined shape when it is determined that tool grinding is necessary.
The process consists of a step of measuring at least the length of the tool tip shape value after machining, and a step of correcting the tool position based on this measurement result. ■Reduction in the number of tools prepared for tool exchange■One tool This has the effect of increasing the machinable volume per unit, improving the precision of workpieces by compensating for tool wear, and increasing the continuous operating time of numerically controlled machine tools that do not have automatic tool changers.
【図面の簡単な説明】
第１図は本発明の数値制御工作機械の工具摩耗の補償方
法の工程を示すフローチャート、第２図は本発明を適用
した門形マシニングセンタの外観図、第３図は測定子に
よる工具の位置の割り出しの説明図、第４図はセンサに
よる工具の形状の測定の説明図、第５図は砥石による工
具の研削の説明図、第６図は工具先端の説明図、第７図
は従来における工具摩耗の対処を示すフローチャートで
ある。
１００〜１１２・・・・・・ステップ、１・・・・・・
門形マシニングセンタ、２・・・・・・ＮＣ装置、３・
・・・・・主軸部、４・・・・・・工具、５・・・・・
・ワーク、６・・・・・・測定子、７・・・・・・セン
サ、８・・・・・・砥石[Brief Description of the Drawings] Fig. 1 is a flowchart showing the steps of the tool wear compensation method for numerically controlled machine tools of the present invention, Fig. 2 is an external view of a double-column machining center to which the present invention is applied, and Fig. 3 is FIG. 4 is an explanatory diagram of the measurement of the tool's shape using a sensor; FIG. 5 is an explanatory diagram of grinding the tool with a grindstone; FIG. 6 is an explanatory diagram of the tip of the tool; FIG. 7 is a flowchart showing a conventional method for dealing with tool wear. 100-112...Step, 1...
Double column machining center, 2...NC device, 3.
...Main shaft, 4...Tool, 5...
・Workpiece, 6...Measure head, 7...Sensor, 8...Whetstone
Claims (1)
値と比較して工具摩耗による工具研削要否を判定する工
程と、工具研削要と判定した際に工具先端を所定の形状
に加工する工程と、加工後に工具先端形状値のうち少な
くとも長さを測定する工程と、この測定結果に基づいて
工具位置を補正する工程とからなることを特徴とする数
値制御工作機械の工具摩耗の補償方法。The process of comparing the shape values such as the outer diameter and length of the tool tip with preset shape values to determine whether tool grinding is necessary due to tool wear, and when it is determined that tool grinding is necessary, the tool tip is shaped into the specified shape. A tool wear prevention method for a numerically controlled machine tool comprising a machining step, a step of measuring at least the length of the tool tip shape value after machining, and a step of correcting the tool position based on the measurement results. Compensation method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1028088A JPH01188252A (en) | 1988-01-20 | 1988-01-20 | Compensation for tool abrasion in nc machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1028088A JPH01188252A (en) | 1988-01-20 | 1988-01-20 | Compensation for tool abrasion in nc machine tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01188252A true JPH01188252A (en) | 1989-07-27 |
Family
ID=11745899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1028088A Pending JPH01188252A (en) | 1988-01-20 | 1988-01-20 | Compensation for tool abrasion in nc machine tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01188252A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0752004A (en) * | 1992-12-18 | 1995-02-28 | Barta Ag | Numerically controlled grinding machine to cut work, especially tool |
| WO2006016420A1 (en) * | 2004-08-12 | 2006-02-16 | Makino Milling Machine Co., Ltd. | Method for machining work |
| EP2080584A1 (en) | 2008-01-17 | 2009-07-22 | VOLLMER WERKE Maschinenfabrik GmbH | Method and device for machining workpieces |
| CN112077669A (en) * | 2020-06-30 | 2020-12-15 | 鸿富锦精密电子(烟台)有限公司 | Tool wear detection and compensation method, device and computer readable storage medium |
| CN113226587A (en) * | 2018-12-27 | 2021-08-06 | 株式会社天田集团 | Mold management device and mold management method |
-
1988
- 1988-01-20 JP JP1028088A patent/JPH01188252A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0752004A (en) * | 1992-12-18 | 1995-02-28 | Barta Ag | Numerically controlled grinding machine to cut work, especially tool |
| WO2006016420A1 (en) * | 2004-08-12 | 2006-02-16 | Makino Milling Machine Co., Ltd. | Method for machining work |
| EP1683605A1 (en) * | 2004-08-12 | 2006-07-26 | Makino Milling Machine Co. Ltd. | Method for machining work |
| EP1683605A4 (en) * | 2004-08-12 | 2006-09-27 | Makino Milling Machine | Method for machining work |
| EP2080584A1 (en) | 2008-01-17 | 2009-07-22 | VOLLMER WERKE Maschinenfabrik GmbH | Method and device for machining workpieces |
| CN113226587A (en) * | 2018-12-27 | 2021-08-06 | 株式会社天田集团 | Mold management device and mold management method |
| CN112077669A (en) * | 2020-06-30 | 2020-12-15 | 鸿富锦精密电子(烟台)有限公司 | Tool wear detection and compensation method, device and computer readable storage medium |
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