JPH0750406B2 - Automatic threading distance setting device - Google Patents
Automatic threading distance setting deviceInfo
- Publication number
- JPH0750406B2 JPH0750406B2 JP2961984A JP2961984A JPH0750406B2 JP H0750406 B2 JPH0750406 B2 JP H0750406B2 JP 2961984 A JP2961984 A JP 2961984A JP 2961984 A JP2961984 A JP 2961984A JP H0750406 B2 JPH0750406 B2 JP H0750406B2
- Authority
- JP
- Japan
- Prior art keywords
- cutting
- distance
- setting device
- delay amount
- automatic threading
- 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
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/182—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by the machine tool function, e.g. thread cutting, cam making, tool direction control
- G05B19/186—Generation of screw- or gearlike surfaces
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/37—Measurements
- G05B2219/37499—Determine cumulative deviation, difference
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/41—Servomotor, servo controller till figures
- G05B2219/41254—Avoid cumulative measuring, calculation errors, sum remainder
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、ねじ加工時の助走を自動的に行なわせるよう
にしたねじ切り助走距離自動設定装置に関するものであ
る。Description: TECHNICAL FIELD The present invention relates to a thread cutting assist distance automatic setting device for automatically performing an approach during screw machining.
（従来例の構成とその問題点） 従来型の数値制御装置のねじ加工に当っては、アドレス
コード指令（例えばG32指令）によってねじ切りを行う
が、その場合、次の（１）式で得られる助走距離をユー
ザが計算、もしくはメーカが付した簡易換算表等により
予め求めて切り込み開始点を設定していた。(Structure of Conventional Example and Problems Thereof) In thread processing of a conventional numerical control device, thread cutting is performed by an address code command (for example, G32 command). In that case, the following formula (1) is obtained. The running distance has been calculated by the user or obtained in advance from a simple conversion table provided by the manufacturer or the like, and the cutting start point has been set.
ここでｌ＝助走距離。 Where l = running distance.
T1＝機械系の時定数。T 1 = mechanical system time constant.
ｔ＝ねじ精度に達するまでの時間。t = time to reach screw accuracy.
ｖ＝ねじ切り時の速度。v = speed when threading.
第１図は助走距離の説明図であり、１はねじ切りバイ
ト、２は被加工物、３はチャックを示し、ｌはねじ切り
バイト１が被加工物２に到達するまでの助走距離を示
す。所定のねじリードを得るために必要な送り速度は
（１）式により計算でも求まるが、正確な助走距離ｌは
系のループゲインを知らなければ求めることができな
い。助走距離ｌが長い場合はねじ切りそのものには問題
ないが、短かい場合はねじ切り込み点付近で必要速度に
到達せず、ねじピッチに誤差を生じる。FIG. 1 is an explanatory view of the approach distance, 1 is a thread cutting tool, 2 is a workpiece, 3 is a chuck, and 1 is a run distance until the thread cutting tool 1 reaches the workpiece 2. The feed rate required to obtain a predetermined screw lead can be calculated by the equation (1), but the accurate approach distance l cannot be calculated without knowing the loop gain of the system. When the approach distance 1 is long, there is no problem in thread cutting itself, but when it is short, the required speed is not reached near the thread cutting point, and an error occurs in the thread pitch.
従ってユーザは安全を見込んで助走距離を長くしてい
た。またユーザにこのような助走距離を計算させること
は現場的でなく、数値制御装置の欠点であった。Therefore, the user has lengthened the approach distance in anticipation of safety. In addition, it is not on-site to let the user calculate such an approach distance, which is a drawback of the numerical control device.
（発明の目的） 本発明は、このような従来型数値制御装置の欠点を除去
し、ねじ切り助走距離を自動的に設定し、適切な切り込
み開始点に移動して円滑なねじの切り込みを行わせるよ
うにしたねじ切り助走距離自動設定装置を提供すること
を目的とするものである。(Object of the Invention) The present invention eliminates such drawbacks of the conventional numerical control device, automatically sets the threading approach distance, and moves to an appropriate cutting start point to perform smooth threading. An object of the present invention is to provide an automatic threading run-up distance setting device as described above.
（発明の構成） 本発明は、偏差カウンタ、ディジタルアナログ変換器、
速度制御器、電動機、速度検出器、パルスコーダ、及び
遅れ量レジスタを具備し、ねじ切り時、第１回目の切り
込み移動指令終了時の偏差カウンタの残距離を遅れ量レ
ジスタに格納し、第２回目以降の切り込みの助走距離と
し、自動的に助走距離を付加するようにした構成を有す
るものである。(Structure of the Invention) The present invention relates to a deviation counter, a digital-analog converter,
Equipped with a speed controller, electric motor, speed detector, pulse coder, and delay amount register. When screw cutting, the remaining distance of the deviation counter at the end of the first cutting movement command is stored in the delay amount register, and after the second time. It has a configuration in which the running distance of the cut is automatically added to the running distance.
（実施例の説明） 第２図は本発明の構成を示す一実施例のブロック図で、
４はCPU、５は偏差カウンタ、６は遅れ量レジスタ、７
はディジタル・アナログ変換器（D/A変換器）、８は速
度制御器、９は電動機（Ｍ）、10は速度検出器（TC）、
11はパルスコーダ（RE）である。(Description of Embodiments) FIG. 2 is a block diagram of an embodiment showing the configuration of the present invention.
4 is a CPU, 5 is a deviation counter, 6 is a delay amount register, 7
Is a digital / analog converter (D / A converter), 8 is a speed controller, 9 is an electric motor (M), 10 is a speed detector (TC),
11 is a pulse coder (RE).
ここで、偏差カウンタ５はCPU4からの移動指令量と機械
可動部からの位置フィードバック量との差分をD/A変換
器７を介して速度制御器８へ出力するもので、次式で制
御される。Here, the deviation counter 5 outputs the difference between the movement command amount from the CPU 4 and the position feedback amount from the mechanical moving part to the speed controller 8 via the D / A converter 7, and is controlled by the following equation. It
Vamp＝（Pi−P0）Kv ……（２） 但し、Vamp＝偏差カウンタの出力。V amp = (P i −P 0 ) K v …… (2) where V amp = deviation counter output.
Pi＝移動指令量。P i = movement command amount.
P0＝フィードバック量。P 0 = feedback amount.
Kv＝ループゲイン。K v = loop gain.
これは次の様に書き換えることが出来る。This can be rewritten as:
ｖ＝ε・Kv ……（３） 但し、ｖ＝送り速度。v = ε · K v (3) where v = feed rate.
ε＝遅れ量。ε = delay amount.
また、ねじのリードと必要速度との関係は、 但し、Ｎ＝主軸回転数（rpn） Ｌ＝ねじリード 従って遅れ量は で求められる。The relationship between the screw lead and the required speed is However, N = spindle speed (rpn) L = screw lead Therefore, the delay amount is Required by.
第３図は本発明のねじ切り助走距離自動設定装置が適用
されるコンパウンドカッティングの説明図である。FIG. 3 is an explanatory diagram of compound cutting to which the automatic threading run distance setting device of the present invention is applied.
ねじ切りの方法にはプランジカッティングとコンパウン
ドカッティングの２通りがある。There are two methods of thread cutting: plunge cutting and compound cutting.
第３図において、第１回目切削から最終切削まで深
さ方向のみを移動させて切削するのがプランジカッティ
ングであり、第２回目切削、第３回目切削……第
ｎ−１回目切削 のように片側に沿わせて切削を行ない、最終切削をね
じの中心部で行なうのがコンパウンドカッティングであ
る。本発明は、いずれのカッティングにも使用できる。In FIG. 3, plunge cutting is performed by moving only the depth direction from the first cutting to the final cutting, and the second cutting, the third cutting ... The (n-1) th cutting. Compound cutting is performed by cutting along one side as shown in the above, and performing final cutting at the center of the screw. The present invention can be used for any cutting.
ねじ切りは、ねじリード、深さ、材質によっても異なる
が、通常10回以上の繰返し切削によって行なわれる。本
発明のねじ切り助走距離自動設定装置は、ねじ切り時の
助走距離を第１回目の切削は遅れ量のサンプリングを
目的としてねじの中心部をカットする。第２回目以降ね
じの片側に沿って切削 を重ね、最終カットに至って再び中心部で仕切切削を
行いねじを完成させる。Although thread cutting differs depending on the screw lead, depth, and material, it is usually performed by cutting 10 times or more. The automatic threading / running distance setting device of the present invention cuts the center distance of the screw for the purpose of sampling the delay amount in the first cutting of the running distance at the time of thread cutting. After the second time, cutting along one side of the screw After completing the final cutting, the partition is cut again at the center to complete the screw.
第１回目のカッティングは第３図でであるが、このと
きは助走必要距離がサンプリングされていないのでねじ
切り助走距離自動設定装置は助走距離を自動計算する。
計算は（５）式によって行なう。このとき、問題になる
のはループゲインKvであるが、通常機械製作時に測定さ
れたループゲインを内部パラメータとして設定してお
く。第２図のCPU4よりの第１回目の移動指令が終了した
とき偏差カウンタ５の残り量が停止までの距離に等し
く、これはまた、ねじ加速を行ない所定速度に達するま
での助走距離と同じである。この残り量を遅れ量レジス
タ６に記憶させ第２回目以降の助走距離として使用す
る。The first cutting is shown in FIG. 3, but at this time, the required approach distance is not sampled, and therefore the thread cutting assist distance automatic setting device automatically calculates the approach distance.
The calculation is performed by the equation (5). At this time, the problem is the loop gain K v , but normally the loop gain measured during machine fabrication is set as an internal parameter. When the first movement command from the CPU 4 in FIG. 2 is completed, the remaining amount of the deviation counter 5 is equal to the distance until the stop, which is the same as the approach distance until the screw acceleration is performed and the predetermined speed is reached. is there. This remaining amount is stored in the delay amount register 6 and used as the approach distance for the second and subsequent times.
第４図は本発明装置におけるねじ切り動作フローチャー
トである。FIG. 4 is a flowchart of the thread cutting operation in the device of the present invention.
（発明の効果） 以上説明したように、本発明のねじ切り助走距離自動設
定装置によれば、ユーザは助走距離を考慮することなく
ねじ切り加工を行なうことができ、更に機械の経年変化
に対してもその速度に適する正確な助走距離が得られ、
ピッチ誤差を生じることが無くなるなど、その工業的利
用価値は大なるものがある。(Effects of the Invention) As described above, according to the automatic threading / running distance setting device of the present invention, the user can perform the thread cutting without considering the running distance, and also with respect to the secular change of the machine. You can get an accurate run distance suitable for that speed,
Its industrial utility value is great, such as the elimination of pitch error.
第１図は助走距離の説明図、第２図は本発明の構成を示
す一実施例のブロック図、第３図は本発明で使用するコ
ンパウンドカッティングの説明図、第４図は本発明装置
におけるねじ切り動作フローチャートである。 １……ねじ切りバイト、２……被加工物、３……チャッ
ク、４……CPU、５……偏差カウンタ、６……遅れ量レ
ジスタ、７……ディジタル・アナログ変換器（D/A変換
器）、８……速度制御器、９……電動機（Ｍ）、10……
速度検出器（TC）、11……パルスコーダ（RE）。FIG. 1 is an explanatory view of an approach distance, FIG. 2 is a block diagram of an embodiment showing the constitution of the present invention, FIG. 3 is an explanatory view of compound cutting used in the present invention, and FIG. It is a thread cutting operation flowchart. 1 ... Thread cutting tool, 2 ... Workpiece, 3 ... Chuck, 4 ... CPU, 5 ... Deviation counter, 6 ... Delay amount register, 7 ... Digital / analog converter (D / A converter) ), 8 ... Speed controller, 9 ... Electric motor (M), 10 ...
Speed detector (TC), 11 …… Pulse coder (RE).
───────────────────────────────────────────────────── フロントページの続き (72)発明者 西垣 寛文 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (56)参考文献 特開 昭52−60388（ＪＰ，Ａ) 特開 昭56−50403（ＪＰ，Ａ) 特公 昭49−23510（ＪＰ，Ｂ１) ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hirofumi Nishigaki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-52-60388 (JP, A) JP-A-56-50403 (JP, A) Japanese Patent Publication Sho 49-23510 (JP, B1)
Claims (1)
器、速度制御器、電動機、速度検出器、パルスコーダ、
及び遅れ量レジスタを具備し、ねじ切り時、第１回目の
切り込み移動指令終了時の偏差カウンタの残距離を遅れ
量レジスタに格納し、第２回目以降の切り込みの助走距
離とし、自動的に助走距離を付加することを特徴とする
ねじ切り助走距離自動設定装置。1. A deviation counter, a digital-analog converter, a speed controller, an electric motor, a speed detector, a pulse coder,
And a delay amount register, the remaining distance of the deviation counter at the end of the first cutting movement command at the time of screw cutting is stored in the delay amount register, and it is automatically set as the approach distance for the second and subsequent cutting. The automatic threading run-up distance setting device characterized by the addition of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2961984A JPH0750406B2 (en) | 1984-02-21 | 1984-02-21 | Automatic threading distance setting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2961984A JPH0750406B2 (en) | 1984-02-21 | 1984-02-21 | Automatic threading distance setting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60175103A JPS60175103A (en) | 1985-09-09 |
| JPH0750406B2 true JPH0750406B2 (en) | 1995-05-31 |
Family
ID=12281095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2961984A Expired - Lifetime JPH0750406B2 (en) | 1984-02-21 | 1984-02-21 | Automatic threading distance setting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0750406B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0716816B2 (en) * | 1989-12-08 | 1995-03-01 | 三菱電機株式会社 | Thread cutting method |
| CN100496837C (en) * | 2003-03-28 | 2009-06-10 | 三菱电机株式会社 | Thread cutting control method and thread cutting controller |
-
1984
- 1984-02-21 JP JP2961984A patent/JPH0750406B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60175103A (en) | 1985-09-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |