JP2974603B2 - Method for controlling the temperature of machining fluid in electric discharge machines - Google Patents
Method for controlling the temperature of machining fluid in electric discharge machinesInfo
- Publication number
- JP2974603B2 JP2974603B2 JP8024224A JP2422496A JP2974603B2 JP 2974603 B2 JP2974603 B2 JP 2974603B2 JP 8024224 A JP8024224 A JP 8024224A JP 2422496 A JP2422496 A JP 2422496A JP 2974603 B2 JP2974603 B2 JP 2974603B2
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- JP
- Japan
- Prior art keywords
- temperature
- machining
- fluid
- tank
- working fluid
- Prior art date
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、加工液タンクとワ
ークを載置したテーブルを囲繞する加工槽との間で液温
調節された加工液を循環させて放電加工を行う放電加工
機の加工液温度制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to machining of an electric discharge machine which performs electric discharge machining by circulating a machining liquid whose temperature is controlled between a machining fluid tank and a machining tank surrounding a table on which a work is placed. The present invention relates to a liquid temperature control method.
【０００２】[0002]
【従来の技術】従来、放電加工機においては、図３に示
したように、放電加工作業の際に先ず加工槽への加工液
の循環供給が開始され、加工槽内には、テーブル温度と
は温度差のある加工液（図３の例では冷たい加工液）が
流入する（例えば、実公昭４８−２７３５１号公報参
照）。このため、加工槽内のテーブル等の構造部材は、
急激な温度変化を受け、それぞれの部材は局所的な温度
差を生じ、その温度差による内部応力で部材の歪（変
形）が発生する。そして時間経過と共に加工液温度は機
体温度に近づいてテーブル全体が略均一な温度になる
が、テーブルとこれを支持する装置本体部分に生じた変
形は引き続き存在し、この変形が消失するには極めて長
時間を要する。2. Description of the Related Art Conventionally, in an electric discharge machine, as shown in FIG. 3, at the time of an electric discharge machining operation, circulation supply of a machining liquid to a machining tank is first started. A working fluid having a temperature difference (a cold working fluid in the example of FIG. 3) flows in (see, for example, Japanese Utility Model Publication No. 48-27351). Therefore, structural members such as tables in the processing tank
In response to a sudden temperature change, each member generates a local temperature difference, and the internal stress caused by the temperature difference causes distortion (deformation) of the member. As the time elapses, the temperature of the working fluid approaches the machine body temperature and the entire table becomes substantially uniform. However, the deformation that has occurred in the table and the main body of the apparatus that supports the table continues to exist. It takes a long time.
【０００３】斯かるテーブル及び装置本体の内部の変形
は、放電加工機のいわゆる熱変形の原因となる、すなわ
ち、主軸に取付けた電極位置とワークの固定位置との相
対関係が変化・変動するために放電加工精度が極端に悪
化する。現状では、これを簡易に解決するために、上記
加工液の循環供給を開始してから充分な時間が経過した
後、すなわち、時間経過により装置内部の温度差が消失
してワーク位置が熱的に安定したと思われる頃合いを見
計らって、放電加工を開始するように構成されている。Such deformation inside the table and the main body of the apparatus causes so-called thermal deformation of the electric discharge machine, that is, the relative relationship between the position of the electrode attached to the main shaft and the fixed position of the work changes and fluctuates. In addition, the accuracy of electric discharge machining is extremely deteriorated. At present, in order to easily solve this problem, after a sufficient time has elapsed since the start of the circulation supply of the working fluid, that is, the temperature difference inside the apparatus has disappeared due to the elapse of time and the work position has been thermally moved. It is configured to start electric discharge machining at an appropriate time when it seems to be stable.
【０００４】[0004]
【発明が解決しようとする課題】しかるに、装置内部の
上記温度差が消失したか否かを定量的に把握することは
容易ではなく、作業者の経験を頼りに上記経過時間を例
えば２〜３時間と設定していることもあり、これは不経
済である。そこで、本発明は、加工槽への加工液の循環
供給により生ずるテーブル近傍の部材の局部的な温度変
化を極力少くし、熱変形による放電加工精度の劣化を抑
えることが可能な放電加工機の加工液温度制御方法を実
現することをその課題とする。However, it is not easy to quantitatively determine whether or not the temperature difference inside the apparatus has disappeared, and the elapsed time is, for example, 2-3 times depending on the experience of the operator. This is uneconomical, as it is sometimes set as time. Therefore, the present invention provides an electric discharge machine capable of minimizing a local temperature change of a member near a table caused by circulating supply of a machining fluid to a machining tank and suppressing deterioration of electric discharge machining accuracy due to thermal deformation. It is an object of the present invention to realize a method for controlling a working fluid temperature.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に本発明に係る放電加工機の加工液温度制御方法は、加
工液タンクとワークを載置したテーブルを囲繞する加工
槽との間で液温調節された加工液を循環させて放電加工
を行う放電加工機において、基台の加工熱の影響を受け
にくい部位の温度を機体温度（Ｔ1 ）として検出し、前
記テーブルや前記テーブルの近傍で加工熱の影響を受け
易い部位の温度をテーブル温度（Ｔ2 ）として検出し、
前記加工液タンクに貯留された加工液の温度を加工液温
度（Ｔ3）として検出し、前記加工液タンクと前記加工
槽との間の加工液の循環を開始する前に、前記テーブル
温度（Ｔ2 ）と前記加工液温度（Ｔ3 ）との温度差が所
定範囲に入るように前記加工液温度（Ｔ3 ）を調節し、
前記温度差が所定範囲に入ったとき前記加工液タンクと
前記加工槽との間の加工液の循環を開始し、その後、前
記テーブル温度（Ｔ2 ）が徐々に前記機体温度（Ｔ1 ）
になるように前記加工液温度（Ｔ3 ）の液温を調節す
る。In order to solve the above-mentioned problems, a method for controlling a temperature of a machining fluid of an electric discharge machine according to the present invention comprises a method of controlling a temperature of a machining fluid between a machining fluid tank and a machining tank surrounding a table on which a work is placed. In an electric discharge machine which performs electric discharge machining by circulating a machining fluid whose liquid temperature is adjusted, a temperature of a portion of the base which is not easily affected by machining heat is detected as a machine temperature (T 1 ), and the table or the table is detected. The temperature of the part which is easily affected by the processing heat in the vicinity is detected as the table temperature (T 2 ),
The temperature of the working fluid stored in the working fluid tank is detected as a working fluid temperature (T 3 ), and before the circulation of the working fluid between the working fluid tank and the working tank is started, the table temperature (T 3 ) is detected. T 2) and the temperature difference between the machining-fluid temperature (T 3) is adjusted to the working fluid temperature (T 3) to fall within a predetermined range,
When the temperature difference falls within a predetermined range, the circulation of the working fluid between the working fluid tank and the working tank is started, and thereafter, the table temperature (T 2 ) is gradually increased to the machine body temperature (T 1 ).
The working fluid temperature (T 3 ) is adjusted so that
【０００６】[0006]
【作用】本発明によれば、加工液の循環に先立ち、液温
調節装置によってタンク内の加工液温度（Ｔ3 ）をテー
ブル温度（Ｔ2 ）と同一ないし近接するように調節し、
その後、前記加工液循環を開始し、以降は、テーブル温
度（Ｔ2 ）が長時間かけて徐々に機体温度（Ｔ1 ）に近
づき、最終的に前記３部位の温度が略一致するように、
加工液温度（Ｔ3 ）を制御するので、機体温度と加工液
温度との差に起因して生じていた熱変位が大幅に低減な
いしなくなり、放電加工における加工精度が向上する。According to the present invention, prior to the circulation of the working fluid, the working fluid temperature (T 3 ) in the tank is adjusted to be the same as or close to the table temperature (T 2 ) by the fluid temperature adjusting device.
Thereafter, the working fluid circulation is started, and thereafter, the table temperature (T 2 ) gradually approaches the machine body temperature (T 1 ) over a long period of time, and finally the temperatures of the three portions substantially match.
Since the working fluid temperature (T 3 ) is controlled, the thermal displacement caused by the difference between the machine body temperature and the working fluid temperature is not significantly reduced, and the machining accuracy in electric discharge machining is improved.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して説明する。図２は、本発明の一実施の形態の
放電加工機の全体概略構成図である。同図を参照する
と、本実施形態のいわゆる形彫り放電加工装置１は、装
置底部のベッド３と、ベッド３の後側に立設したコラム
５と、コラム５上部に対して水平方向に可動に取着され
たラム７と、ラム７前部に対して垂直方向に可動に取着
された主軸ヘッド９と、ベッド３の前側に立設したテー
ブルベース１１と、テーブルベース１１上に固定された
テーブル１３と、テーブル１３を取り囲む加工槽１５、
とを有して成り、主軸ヘッド９下端に取着した加工電極
１７とテーブル１３上に固定したワークＷとの間に火花
放電を生じさせてワークＷに、加工電極１７と同じ立体
断面形状の転写加工を行う工作機械である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is an overall schematic configuration diagram of an electric discharge machine according to an embodiment of the present invention. Referring to FIG. 1, a so-called die-sinker electric discharge machine 1 of the present embodiment is horizontally movable with respect to a bed 3 at the bottom of the machine, a column 5 erected on the rear side of the bed 3, and an upper portion of the column 5. The mounted ram 7, a spindle head 9 movably mounted in a direction perpendicular to the front of the ram 7, a table base 11 erected on the front side of the bed 3, and fixed on the table base 11. A table 13, a processing tank 15 surrounding the table 13,
A spark discharge is generated between the machining electrode 17 attached to the lower end of the spindle head 9 and the work W fixed on the table 13 to form a work W having the same three-dimensional cross-sectional shape as the machining electrode 17. A machine tool that performs transfer processing.
【０００８】ワークＷは、加工液が満たされる加工槽１
５の内部底部のテーブル１３上に載置され、加工液は、
循環ループＲ1 内に配置した循環用ポンプ１９によっ
て、加工槽１５と加工液タンク（以下、タンク）２１と
の間で循環され、タンク２１内の加工液は、この循環ル
ープＲ1 とは異なる温調ループＲ2 内に配置した液温調
節装置２３によって温度調節される。The work W is filled in a processing tank 1 filled with a processing liquid.
5 is placed on the table 13 at the bottom of the inside,
The circulation pump 19 disposed in the circulation loop R 1 circulates between the processing tank 15 and a processing liquid tank (hereinafter, tank) 21, and the processing liquid in the tank 21 differs from the circulation loop R 1. and temperature-regulated by the temperature control loop R 2 in the liquid temperature adjusting device 23 disposed in the.
【０００９】この加工液温度制御のために、本放電加工
装置１の所定３部位には、温度測定用のセンサが設けら
れる。すなわち、加工液から熱的影響を受けにくい部
位であって目標温度部位となり得るコラム５（機体）、
加工液から熱的影響を受け易い部位を代表し得るテー
ブル１３、加工液を貯留したタンク２１（加工液）に
は、それらの各温度Ｔ1 （機体温度）、Ｔ2 （テーブル
温度）、Ｔ3 （加工液温度）をそれぞれ計測し得るよう
に対応したセンサＳ1、Ｓ2、Ｓ3 が設けられる。そし
て、これら３つのセンサＳ1 〜Ｓ3 、循環用ポンプ１
９、液温調節装置２３等は、これらを制御するコントロ
ーラ２５と電気的に接続される。尚、コントローラ２５
は、本放電加工装置１の制御装置（図示せず）で実質的
に代替可能である。In order to control the temperature of the machining fluid, sensors for measuring the temperature are provided at three predetermined positions of the electric discharge machining apparatus 1. That is, the column 5 (body) which is a portion that is hardly thermally affected by the working fluid and can be a target temperature portion,
The table 13, which can represent a portion that is easily affected by the working fluid, and the tank 21 (working fluid) storing the working fluid have their respective temperatures T 1 (machine temperature), T 2 (table temperature), T 2 (table temperature). Sensors S 1 , S 2 , and S 3 are provided so as to measure 3 (working fluid temperature), respectively. Then, these three sensors S 1 to S 3 and the circulation pump 1
9. The liquid temperature control device 23 and the like are electrically connected to a controller 25 that controls them. The controller 25
Can be substantially replaced by a control device (not shown) of the electric discharge machining apparatus 1.
【００１０】以上の構成を有する本実施形態装置におけ
る加工液の温度制御の実際の手順について、図１を参照
して以下説明する。 （i)先ず、タンクから加工槽（テーブル）に加工液を循
環供給する前に、液温調節装置によってタンク内の加工
液の温度（Ｔ3 ）をテーブル温度（Ｔ2 ）に近づける
（図１の例ではＴ3 を上昇させているが、場合によって
は下降させることもある）。The actual procedure of controlling the temperature of the working fluid in the apparatus having the above-described configuration according to the present embodiment will be described below with reference to FIG. (I) First, before the working fluid is circulated from the tank to the working tank (table), the temperature (T 3 ) of the working fluid in the tank is brought close to the table temperature (T 2 ) by the liquid temperature controller (FIG. 1). the example has to raise the T 3, sometimes lowering in some cases).
【００１１】（ii）次いで、テーブル温度（Ｔ2 ）に対
して、加工液温度（Ｔ3 ）が略一致ないしは或る程度近
づいたら（所定範囲Ａ内に入ったら）、前記加工槽への
加工液の循環供給を開始する。尚、本装置内の放電加工
作業については、この段階以降に適宜開始することがで
きる。 （iii) 前記加工液の循環供給の開始後は、急激にＴ2
をＴ3 に近づけることによる熱変形を避けるため、テー
ブル温度（Ｔ2 ）を一定の変温率にて機体温度（Ｔ1 ）
に収束させ、最終的に３つの温度Ｔ1 、Ｔ2 、Ｔ3 が略
一致するように、加工液温度（Ｔ3 ）を調節・制御す
る。この変温率としては、例えば、０．５〜１°Ｃ／時
とすることができる。あるいは、温度差一定制御を行う
ことが考えられる。(Ii) Next, when the temperature of the working fluid (T 3 ) substantially matches or approaches the table temperature (T 2 ) or reaches a certain degree (when the temperature falls within the predetermined range A), the processing to the working tank is performed. Start circulation supply of liquid. Incidentally, the electric discharge machining operation in the present apparatus can be appropriately started after this stage. (Iii) After the start of the circulation supply of the working fluid, T 2
Table temperature (T 2 ) at a constant temperature change rate (T 1 ) to avoid thermal deformation caused by bringing the temperature closer to T 3.
And the working fluid temperature (T 3 ) is adjusted and controlled so that the three temperatures T 1 , T 2 , and T 3 finally match. The temperature change rate can be, for example, 0.5 to 1 ° C./hour. Alternatively, it is conceivable to perform temperature difference constant control.
【００１２】以上のように、本実施例においては、装置
の所定３部位の温度を検出しそれに基づき加工液を適切
に温度管理するので、すなわち、具体的には、加工槽へ
の加工液の循環供給を開始する前に、先ず加工液の温度
を上昇させてテーブル温度に近づけ、その後に該循環供
給を開始するので、温度差のある加工液がテーブルに一
気に供給されない、換言するとテーブル（及びテーブル
ベース等のテーブル支承部）が局所的に急激な温度変化
にさらされなくなり、また、テーブル等が加工液と共に
長時間かけて緩やかに温度変化せしめられるので、テー
ブル等の熱変形を飛躍的に抑制・緩和でき、これによ
り、該熱変位に起因していた加工精度の悪化を軽減ない
し殆どなくすことができる。しかも、実質的に遊休期間
が不要となり、加工液の循環供給の開始直後から放電加
工を行うことができ、非常に経済的である。As described above, in the present embodiment, the temperatures of three predetermined parts of the apparatus are detected and the temperature of the processing fluid is appropriately controlled based on the detected temperatures. Before starting the circulating supply, the temperature of the working fluid is first raised to approach the table temperature, and then the circulating supply is started, so that the working fluid having a temperature difference is not supplied to the table at a stretch, in other words, the table (and The table support such as the table base) is not locally exposed to sudden temperature changes, and the temperature of the table can be changed slowly with the machining fluid over a long period of time. It is possible to suppress or alleviate this, and thereby it is possible to reduce or almost eliminate deterioration in processing accuracy caused by the thermal displacement. Moreover, an idle period is substantially unnecessary, and electric discharge machining can be performed immediately after the start of circulation supply of the machining fluid, which is very economical.
【００１３】[0013]
【発明の効果】以上説明したように本発明によれば、加
工槽への加工液の循環供給の開始後直ちに放電加工作業
を行うことができ、しかも放電加工精度をおとさずにす
み、極めて合理的・経済的である。As described above, according to the present invention, the electric discharge machining operation can be performed immediately after the circulation supply of the machining fluid to the machining tank is started, and the electric discharge machining accuracy can be kept low. Economical.
【図１】本実施形態に係る加工液の温度制御における３
部位の温度と時間との関係を示す線図である。FIG. 1 is a diagram illustrating a process liquid temperature control according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a relationship between a temperature of a part and time.
【図２】本実施形態に係る放電加工機の全体概略構成図
である。FIG. 2 is an overall schematic configuration diagram of an electric discharge machine according to the present embodiment.
【図３】従来の加工液温度制御における３部位の温度と
時間との関係を示す線図である。FIG. 3 is a diagram showing the relationship between temperature and time at three locations in conventional machining fluid temperature control.
１…放電加工装置 ３…ベッド ５…コラム ７…ラム ９…主軸ヘッド １１…テーブルベース １３…テーブル １５…加工槽 １７…加工電極 １９…循環用ポンプ ２１…加工液タンク ２３…液温調節装置 ２５…コントローラ Ｒ1 …循環ループ Ｒ2 …温調ループ Ｓ1 、Ｓ2 、Ｓ3 …センサ Ｗ…ワークDESCRIPTION OF SYMBOLS 1 ... Electrical discharge machine 3 ... Bed 5 ... Column 7 ... Ram 9 ... Spindle head 11 ... Table base 13 ... Table 15 ... Machining tank 17 ... Machining electrode 19 ... Circulation pump 21 ... Machining fluid tank 23 ... Liquid temperature controller 25 … Controller R 1 … Circulation loop R 2 … Temperature control loop S 1 , S 2 , S 3 … Sensor W… Work
Claims (2)
ルを囲繞する加工槽との間で液温調節された加工液を循
環させて放電加工を行う放電加工機の加工液温度制御方
法において、 基台の加工熱の影響を受けにくい部位の温度を機体温度
（Ｔ1 ）として検出し、 前記テーブルや前記テーブルの近傍で加工熱の影響を受
け易い部位の温度をテーブル温度（Ｔ2 ）として検出
し、前記 加工液タンクに貯留された加工液の温度を加工液温
度（Ｔ3 ）として検出し、前記加工液タンクと前記加工槽との間の加工液の循環を
開始する前に、 前記テーブル温度（Ｔ2 ）と前記加工液
温度（Ｔ3 ）との温度差が所定範囲に入るように前記加
工液温度（Ｔ3 ）を調節し、 前記温度差が所定範囲に入ったとき前記加工液タンクと
前記加工槽との間の加工液の循環を開始し、 その後、前記テーブル温度（Ｔ2 ）が徐々に前記機体温
度（Ｔ1 ）になるように前記加工液温度（Ｔ3 ）の液温
を調節することを特徴とした放電加工機の加工液温度制
御方法。1. A method for controlling a temperature of a machining fluid in an electric discharge machine , which circulates a machining fluid whose temperature is controlled between a machining fluid tank and a machining tank surrounding a table on which a workpiece is mounted, and performs electrical discharge machining.
In law, to detect the temperature of a portion less susceptible to base the processing heat as airframe temperature (T 1), said table and said table near a temperature table temperature of likely sites affected by processing heat of (T 2) detecting the said temperature of the working fluid stored in the tank working fluid is detected as working fluid temperature (T 3), the circulation of the working fluid between the processing tank and the processing solution tank
Before starting, the working fluid temperature (T 3 ) is adjusted so that the temperature difference between the table temperature (T 2 ) and the working fluid temperature (T 3 ) is within a predetermined range, and the temperature difference is within a predetermined range. When entering the processing fluid tank
The circulation of the machining fluid to and from the machining bath is started, and then the fluid temperature of the machining fluid (T 3 ) is set so that the table temperature (T 2 ) gradually becomes the machine body temperature (T 1 ) < A method for controlling the temperature of a machining fluid in an electric discharge machine, characterized by adjusting the temperature of the machining fluid.
る際、前記テーブル温度（Ｔ2 ）の変温率が予め決めら
れた所定変温率に従うように制御する請求項１記載の放
電加工機の加工液温度制御方法。2. The method according to claim 1, wherein, when adjusting the liquid temperature of the processing liquid temperature (T 3 ) , the temperature change rate of the table temperature (T 2 ) is controlled so as to follow a predetermined temperature change rate. Method of controlling the temperature of machining fluid in electric discharge machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8024224A JP2974603B2 (en) | 1996-02-09 | 1996-02-09 | Method for controlling the temperature of machining fluid in electric discharge machines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8024224A JP2974603B2 (en) | 1996-02-09 | 1996-02-09 | Method for controlling the temperature of machining fluid in electric discharge machines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09216131A JPH09216131A (en) | 1997-08-19 |
| JP2974603B2 true JP2974603B2 (en) | 1999-11-10 |
Family
ID=12132309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8024224A Expired - Fee Related JP2974603B2 (en) | 1996-02-09 | 1996-02-09 | Method for controlling the temperature of machining fluid in electric discharge machines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2974603B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5374625B1 (en) * | 2012-08-01 | 2013-12-25 | ファナック株式会社 | Temperature monitoring device for wire electric discharge machine |
| CN103906594B (en) | 2012-10-30 | 2017-05-10 | 三菱电机株式会社 | Wire electrical discharge machine and cooling control device |
-
1996
- 1996-02-09 JP JP8024224A patent/JP2974603B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09216131A (en) | 1997-08-19 |
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