JP2011062800A - Wire cut electric discharge machine controlling supply amount of working liquid into working tank and performing water temperature-constant control - Google Patents

Wire cut electric discharge machine controlling supply amount of working liquid into working tank and performing water temperature-constant control Download PDF

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JP2011062800A
JP2011062800A JP2009217649A JP2009217649A JP2011062800A JP 2011062800 A JP2011062800 A JP 2011062800A JP 2009217649 A JP2009217649 A JP 2009217649A JP 2009217649 A JP2009217649 A JP 2009217649A JP 2011062800 A JP2011062800 A JP 2011062800A
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tank
machining
processing
difference value
processing liquid
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Yuji Takayama
雄司 高山
Mitsutsugu Ishihara
光告 石原
Akira Nishikawa
亮 西川
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Fanuc Corp
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Fanuc Corp
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Priority to CN2010102537130A priority patent/CN102019471A/en
Priority to KR1020100078263A priority patent/KR20110031084A/en
Publication of JP2011062800A publication Critical patent/JP2011062800A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/02—Wire-cutting
    • B23H7/08—Wire electrodes
    • B23H7/10—Supporting, winding or electrical connection of wire-electrode
    • B23H7/101—Supply of working media
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
    • B23H1/10—Supply or regeneration of working media
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H11/00—Auxiliary apparatus or details, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/36—Supply or regeneration of working media

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire cut electric discharge machine supplying a working liquid whose temperature is controlled from a clear water tank or a waste water tank to the working tank and controlling the water temperature of the working liquid in the working tank constant. <P>SOLUTION: The water temperature of the working liquid in the working tank is detected by a temperature sensor, and a detected water temperature value Td is obtained (SA1). A difference value ΔT of the detected water temperature value Td and a reference water temperature value Tth preset inside a control device is obtained (SA2). Whether the difference value ΔT is greater than an allowable difference value Δt(≥0) is determined, and when the difference value ΔT is greater than the allowable difference value Δt, a step SA4 is executed, whereas when the difference value ΔT is the allowable difference value Δt or below, a step SA5 is executed (SA3). A working liquid storing pump is driven so that the number of revolution of the working liquid storing pump is proportional to the difference value ΔT, and the process of this control cycle is finished (SA4). Drive of the working liquid storing pump is stopped, and the process of this control cycle is finished (SA5). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、ワイヤカット放電加工機に関し、特に、清水槽または汚水槽から加工槽に水温制御された加工液を供給し、加工槽内の加工液の水温を一定に制御するワイヤカット放電加工機に関する。   The present invention relates to a wire-cut electric discharge machine, and in particular, a wire-cut electric discharge machine that supplies a machining liquid whose water temperature is controlled from a fresh water tank or a sewage tank to a machining tank and controls the water temperature of the machining liquid in the machining tank to be constant. About.

ワイヤカット放電加工機は、ワイヤ電極と被加工物であるワークの隙間に電圧を印加して放電を発生させてワークを加工する機械である。このワイヤ電極とワーク間の絶縁、冷却、および、放電によって発生した加工屑の除去のために、加工液をこのワイヤ電極とワークとの間に介在させる。加工液としては例えば水が用いられている。   A wire-cut electric discharge machine is a machine that applies a voltage to a gap between a wire electrode and a workpiece that is a workpiece to generate an electric discharge to process the workpiece. A working fluid is interposed between the wire electrode and the workpiece in order to insulate the cooling between the wire electrode and the workpiece, cool, and remove machining waste generated by the electric discharge. For example, water is used as the processing liquid.

ワイヤカット放電加工機において、加工槽内に加工液を溜めてワークの加工を行う際には、ワイヤ電極とワークとの間の放電によって熱が発生する。そして、この熱によって、加工槽内の加工液の一部の液温が上昇する。加工液の一部の液温が上昇した状態においては、暖められた加工液に接するワークやワークを載置するテーブルなどワイヤカット放電加工機の機械部分に局部的な熱変形が生じて加工精度が悪化する原因となる。また、放電によって発生する熱量はワークの加工条件によって変化することから、加工液の温度上昇は加工条件によって異なり、加工精度悪化の程度も一様ではない。   In a wire cut electric discharge machine, when a machining liquid is stored in a machining tank and a workpiece is machined, heat is generated by electric discharge between the wire electrode and the workpiece. And with this heat, the liquid temperature of a part of the machining liquid in the machining tank rises. When the temperature of a part of the machining fluid rises, local thermal deformation occurs in the machine part of the wire-cut electrical discharge machine, such as the workpiece in contact with the heated machining fluid and the table on which the workpiece is placed. Cause it to get worse. In addition, since the amount of heat generated by the discharge varies depending on the workpiece machining conditions, the temperature rise of the machining fluid varies depending on the machining conditions, and the degree of deterioration of machining accuracy is not uniform.

従来、加工槽内の加工液の液温を一定にする技術として、特許文献１には、加工液の循環経路内に加工液冷却装置を付設する技術が開示されている（第２ページ左上欄から右上欄を参照）。特許文献２には、加工槽内の加工液をポンプで排出して冷却し、加工槽に再結合して循環／攪拌させる技術が開示されている。特許文献３には、電極の温度に応じて循環路に供給される液体の温度と流量の少なくとも一方を制御して電極の温度を制御する技術が開示されている。   Conventionally, as a technique for keeping the temperature of the machining liquid in the machining tank constant, Patent Document 1 discloses a technique in which a machining liquid cooling device is provided in the machining liquid circulation path (upper left column on page 2). To see the upper right column). Patent Document 2 discloses a technique in which a processing liquid in a processing tank is discharged by a pump, cooled, re-coupled to the processing tank, and circulated / stirred. Patent Document 3 discloses a technique for controlling the temperature of the electrode by controlling at least one of the temperature and the flow rate of the liquid supplied to the circulation path according to the temperature of the electrode.

特開昭５９−２３２７２３号公報JP 59-232723 A 特開平８−２１５９４０号公報JP-A-8-215940 特公平２−３２０８４号公報JP-B-2-32084

背景技術で説明した特許文献１に開示される技術では、より低温に強く冷却された加工液が加工槽内に直接排出されること、および、加工液冷却装置に流せる流量には上限があることから、より低温に強く冷却された加工液が加工槽内全体に行き渡るまでの時間内は、加工槽内の加工液の温度分布が一様ではなくなり、温度勾配を生じてしまい加工精度悪化の原因となり問題である。   In the technique disclosed in Patent Document 1 described in the background art, the processing liquid that is strongly cooled to a lower temperature is directly discharged into the processing tank, and the flow rate that can be passed to the processing liquid cooling device has an upper limit. During the time until the processing liquid that has been strongly cooled to a lower temperature reaches the entire processing tank, the temperature distribution of the processing liquid in the processing tank is not uniform, causing a temperature gradient and causing deterioration in processing accuracy. It becomes a problem.

特許文献２に開示される技術では、ポンプ１台に対して上下ガイドの加工液の管路とその途中から分岐した管路とによって加工槽に加工液を供給する構造となっているため、加工で使用される加工液量の多少によって加工槽に供給される加工液の量が変化してしまう問題と、加工で発生する熱の大小に対して可変的に必要十分な流量を確保できない問題があるとともに、加工液の供給動作と加工液冷却装置の作動を同期させる必要がある。   The technique disclosed in Patent Document 2 has a structure in which the machining liquid is supplied to the machining tank through a pipe for machining liquid of the upper and lower guides and a pipe branched from the middle for one pump. The amount of machining fluid supplied to the machining tank varies depending on the amount of machining fluid used in the process, and the problem that the necessary and sufficient flow rate cannot be secured variably for the amount of heat generated during machining. In addition, it is necessary to synchronize the operation of supplying the machining fluid and the operation of the machining fluid cooling device.

特許文献３に開示される技術では、電極の温度を調整することによって電極の消耗を低減するものであって、加工液の温度変化による加工精度の悪化を軽減することは記載もないし示唆もされていない。   In the technique disclosed in Patent Document 3, the consumption of the electrode is reduced by adjusting the temperature of the electrode, and it is neither described nor suggested that the deterioration of the machining accuracy due to the temperature change of the machining liquid is reduced. Not.

そこで本発明の目的は、上記従来技術の問題点に鑑み、清水槽または汚水槽から加工槽に水温制御された加工液を供給し、加工槽内の加工液の水温を一定に制御するワイヤカット放電加工機を提供することである。   Therefore, in view of the above-mentioned problems of the prior art, an object of the present invention is to supply a cutting fluid whose temperature is controlled from a fresh water tank or a sewage tank to a processing tank, and to control the water temperature of the processing liquid in the processing tank to be constant. It is to provide an electric discharge machine.

本願の請求項１に係る発明は、加工槽と、該加工槽の加工液ドレイン部から流出した加工液を回収および貯留する汚水槽と、該汚水槽の加工液をフィルタを通した後に貯留する清水槽と、該清水槽の加工液を冷却する加工液冷却装置と、前記加工槽に加工液を貯留するため、前記清水槽または前記汚水槽の加工液を前記加工槽に供給するための加工液溜め用ポンプと、前記清水槽の加工液を上下ワイヤ電極ガイドに供給する加工用加工液供給ポンプと、前記加工液溜め用ポンプと前記加工用加工液供給ポンプとを制御する制御装置を備えたワイヤカット放電加工機であって、前記加工槽内に配設され加工液の液温を検出する温度センサと、該温度センサにより検知された前記加工液の温度と、前記制御装置に予め設定された基準温度との差分値を求める温度差算出手段と、該温度差算出手段で求められた差分値が前記制御装置に予め設定された許容差分値（≧０）より大きいか否かに基づいて前記加工槽に加工液を供給するか否かを判断する判断手段と、前記判断手段により前記差分値が前記許容差分値より大きいと判断された場合には、前記温度差算出手段によって算出された差分値に基づいて前記加工液溜め用ポンプを制御し前記加工槽内に供給する加工液の量を調節し、前記許容差分値以下と判断された場合には、該加工液溜め用ポンプの駆動を停止する加工液流量制御手段と、を備えたことを特徴とする加工槽内への加工液の供給量を制御し水温一定制御を行うワイヤカット放電加工機である。   The invention according to claim 1 of the present application stores a processing tank, a sewage tank that collects and stores the processing liquid flowing out from the processing liquid drain portion of the processing tank, and stores the processing liquid in the sewage tank after passing through a filter. A fresh water tank, a processing liquid cooling device for cooling the processing liquid in the fresh water tank, and a process for supplying the processing liquid in the fresh water tank or the sewage tank to the processing tank in order to store the processing liquid in the processing tank. A liquid storage pump, a processing liquid supply pump for supplying the processing liquid in the fresh water tank to the upper and lower wire electrode guides, and a control device for controlling the processing liquid reservoir pump and the processing liquid supply pump. A wire-cut electric discharge machine, a temperature sensor disposed in the machining tank for detecting the temperature of the machining liquid, the temperature of the machining liquid detected by the temperature sensor, and preset in the control device Difference from the measured reference temperature Temperature difference calculating means for determining the difference between the temperature difference calculating means and the difference value obtained by the temperature difference calculating means is greater than an allowable difference value (≧ 0) preset in the control device. Determining means for determining whether or not to supply, and when the determining means determines that the difference value is greater than the allowable difference value, the processing based on the difference value calculated by the temperature difference calculating means A processing fluid flow rate control that controls the liquid storage pump to adjust the amount of processing liquid supplied into the processing tank and stops driving the processing liquid storage pump when it is determined to be equal to or less than the allowable difference value. A wire-cut electric discharge machine that controls the supply amount of the machining liquid into the machining tank and performs constant water temperature control.

請求項２に係る発明は、前記加工液流量制御手段は、前記温度差算出手段によって算出された温度差データに応じて前記加工液溜め用ポンプの回転数を変更し、前記加工機に供給する加工液の量を制御することを特徴とする請求項１に記載の加工槽内への加工液の供給量を制御し水温一定制御を行うワイヤカット放電加工機である。   According to a second aspect of the present invention, the machining fluid flow rate control means changes the number of revolutions of the machining fluid reservoir pump in accordance with the temperature difference data calculated by the temperature difference calculation means, and supplies it to the processing machine. The wire-cut electric discharge machine which controls the supply amount of the machining liquid into the machining tank according to claim 1 and performs constant water temperature control, wherein the quantity of the machining liquid is controlled.

請求項３に係る発明は、前記加工液溜め用ポンプから前記加工槽に接続された管路の途中から分岐して前記汚水槽に戻るバイパス用管路を設け、該バイパス用管路の途中に前記加工液の流量を制御するバイパス流量調整装置を備え、前記加工液流量制御手段は、前記加工液溜め用ポンプを制御し前記加工槽内に供給する加工液の量を調節することに替えて、前記判断手段により前記差分値が前記許容差分値より大きいと判断された場合には、前記温度差算出手段によって算出された差分値に基づいて前記バイパス流量調整装置を制御することによって前記加工槽に供給する加工液の量を調節し、前記許容差分値以下と判断された場合には、該加工液溜め用ポンプの駆動を停止することを特徴とする請求項１に記載の加工槽内への加工液の供給量を制御し水温一定制御を行うワイヤカット放電加工機である。   According to a third aspect of the present invention, there is provided a bypass pipeline that branches from the middle of the pipeline connected to the machining tank from the machining fluid reservoir pump and returns to the sewage tank, and is provided in the middle of the bypass pipeline. A bypass flow rate adjusting device for controlling the flow rate of the machining fluid, wherein the machining fluid flow rate control means controls the machining fluid reservoir pump to adjust the amount of the machining fluid supplied into the machining tank. When the determination means determines that the difference value is larger than the allowable difference value, the processing tank is controlled by controlling the bypass flow rate adjusting device based on the difference value calculated by the temperature difference calculation means. The amount of the machining liquid supplied to the machining tank is adjusted, and when it is determined that the value is equal to or less than the allowable difference value, the driving of the machining liquid reservoir pump is stopped. Supply of machining fluid A wire-cut electric discharge machine to control the performing water temperature constant control.

請求項４に係る発明は、前記温度センサを、加工液ドレイン部、上ガイド、下ガイド、加工槽のいずれかの箇所に備えたことを特徴とする請求項１〜３のいずれか１つに記載の加工槽内への加工液の供給量を制御し水温一定制御を行うワイヤカット放電加工機である。   The invention according to claim 4 is characterized in that the temperature sensor is provided in any one of the machining liquid drain part, the upper guide, the lower guide, and the machining tank. It is a wire-cut electric discharge machine which controls the supply amount of the machining fluid into the described machining tank and performs constant water temperature control.

本発明により、清水槽または汚水槽から加工槽に水温制御された加工液を供給し、加工槽内の加工液の水温を一定に制御するワイヤカット放電加工機を提供できる。   According to the present invention, it is possible to provide a wire-cut electric discharge machine that supplies a processing liquid whose water temperature is controlled from a fresh water tank or a sewage tank to a processing tank and controls the water temperature of the processing liquid in the processing tank to be constant.

本発明の第１の実施形態の概略ブロック図である。1 is a schematic block diagram of a first embodiment of the present invention. 第１の実施形態における加工液の温度制御を行う処理のアルゴリズムを示すフローチャートである。It is a flowchart which shows the algorithm of the process which performs the temperature control of the process liquid in 1st Embodiment. 本発明の第２の実施形態の概略ブロック図である。It is a schematic block diagram of the 2nd Embodiment of this invention. 第２の実施形態における加工液の温度制御を行う処理のアルゴリズムを示すフローチャートである。It is a flowchart which shows the algorithm of the process which performs the temperature control of the process liquid in 2nd Embodiment.

以下、本発明の実施形態を図面と共に説明する。
先ず、本発明の第１の実施形態を説明する。図１は、本発明の第１の実施形態の概略ブロック図である。制御装置１は、ワイヤカット放電加工機を制御する制御装置であり、加工プログラムに従ってワークの加工をコンピュータ制御で実行可能な数値制御機能を備えた数値制御装置である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a first embodiment of the present invention will be described. FIG. 1 is a schematic block diagram of a first embodiment of the present invention. The control device 1 is a control device that controls a wire-cut electric discharge machine, and is a numerical control device that has a numerical control function capable of executing workpiece machining by computer control in accordance with a machining program.

ワイヤ放電加工機の機構部（図示せず）に加工槽２が設けられ、加工槽２内には放電加工部が設けられている。機構部は被加工物であるワークが載置されるように構成されたテーブルを備え、該ワークと図示しないワイヤ電極間に電圧を印加し放電を発生させながらワークとワイヤ電極を相対移動させることによってワークに放電加工を行う。また、加工槽２には、加工液が清水槽７から供給され溜められている。この加工槽２内の加工液は、放電加工によって生じた加工屑などが混入しており、この加工液は加工液ドレイン部１２を解して汚水槽３に排出されるように構成されている。   A machining tank 2 is provided in a mechanical part (not shown) of the wire electric discharge machine, and an electric discharge machining part is provided in the machining tank 2. The mechanism includes a table configured to place a workpiece, which is a workpiece, and relatively moves the workpiece and the wire electrode while applying a voltage between the workpiece and a wire electrode (not shown) to generate a discharge. EDM is performed on the workpiece. Further, in the processing tank 2, the processing liquid is supplied and stored from the fresh water tank 7. The machining fluid in the machining tank 2 is mixed with machining waste generated by electric discharge machining, and the machining liquid is configured to be discharged to the sewage tank 3 through the machining liquid drain portion 12. .

汚水槽３に回収・貯留された加工液は、図示しないフィルタ用ポンプで汲み上げられ、フィルタに通されて濾過され、加工屑などが取り除かれて清水槽７に供給される。汚水槽３と清水槽７とは隔壁５によって区画されている。清水槽７に貯留された加工液は、加工液冷却装置９によって予め設定された一定温度となるように制御されている。加工液冷却装置９は管路Ｌｄを介して加工液を取り込み、冷却し、管路Ｌｅを介して清水槽７に戻す。   The processing liquid collected and stored in the sewage tank 3 is pumped up by a filter pump (not shown), filtered through a filter, and processed waste is removed and supplied to the fresh water tank 7. The dirty water tank 3 and the fresh water tank 7 are partitioned by a partition wall 5. The machining liquid stored in the fresh water tank 7 is controlled by the machining liquid cooling device 9 so as to have a preset constant temperature. The machining liquid cooling device 9 takes in the machining liquid through the pipe line Ld, cools it, and returns it to the fresh water tank 7 through the pipe line Le.

加工槽２に加工槽２内の加工液の温度を検出する検出手段としての温度センサ１０を備え、温度センサ１０は制御装置１に接続されており、制御装置１は温度センサ１０で検出した加工液温度を検出水温値Ｔｄとして取得する。   The processing tank 2 is provided with a temperature sensor 10 as a detecting means for detecting the temperature of the processing liquid in the processing tank 2, the temperature sensor 10 is connected to the control device 1, and the control device 1 detects the processing detected by the temperature sensor 10. The liquid temperature is acquired as the detected water temperature value Td.

加工またはポンプの稼動による発熱によって、加工槽２内の加工液の水温が上昇する現象に対し、加工槽２内の加工液の水温を温度センサ１０によって検知する。温度センサ１０の設置場所として、加工液の水温上昇が加工点とあまり時間差なく発生する加工液ドレイン部１２が望ましいが、その他の設置場所としては、上下ワイヤ電極ガイド８の上ガイド、下ガイド、加工槽２の壁面、加工液冷却装置９の加工液吸い込み部、汚水槽３、または、清水槽７とすることができる。   The temperature sensor 10 detects the water temperature of the processing liquid in the processing tank 2 against the phenomenon in which the water temperature of the processing liquid in the processing tank 2 rises due to heat generated by the processing or operation of the pump. The installation location of the temperature sensor 10 is preferably the machining fluid drain 12 where the rise in the temperature of the machining fluid occurs without much time difference from the machining point, but other installation locations include an upper guide, a lower guide, It can be set as the wall surface of the processing tank 2, the processing liquid suction part of the processing liquid cooling device 9, the sewage tank 3, or the fresh water tank 7.

加工液溜め用ポンプＰ２が、清水槽７に貯留された加工液を汲み上げ、加工液供給管路Ｌａを介して加工槽２に加工液を供給する。加工液供給管路Ｌａは、清水槽７から加工槽２に向かう途中で、加工槽側面側加工液溜め用管路Ｌａ１とアーム先端加工液溜め用管路Ｌａ２とに分岐され、それぞれの管路から加工液が加工槽２内に供給される。   The processing liquid reservoir pump P2 pumps up the processing liquid stored in the fresh water tank 7 and supplies the processing liquid to the processing tank 2 through the processing liquid supply line La. The machining liquid supply pipe La is branched into a machining tank side-side machining liquid reservoir pipe La1 and an arm tip machining liquid reservoir pipe La2 on the way from the fresh water tank 7 to the machining tank 2, and the respective pipe lines. Then, the machining fluid is supplied into the machining tank 2.

加工用加工液供給ポンプＰ１は、清水槽７に貯留された加工液を汲み上げ、加工用加工液供給管路Ｌｂを介して上下ワイヤ電極ガイド８に供給され、上下ワイヤ電極ガイド８に設けられたノズルから、ワイヤ電極とワーク間の間隙に向けて加工液を噴流し、この間隙を冷却すると共に、放電によって生じた加工屑をこの間隙から除去する。   The machining fluid supply pump P <b> 1 pumps up the machining fluid stored in the fresh water tank 7, is supplied to the upper and lower wire electrode guides 8 through the machining fluid supply line Lb, and is provided in the upper and lower wire electrode guides 8. The machining liquid is jetted from the nozzle toward the gap between the wire electrode and the workpiece, the gap is cooled, and machining waste generated by the electric discharge is removed from the gap.

加工用加工液供給ポンプＰ１は加工用加工液供給ポンプ用インバータＩ１により駆動され、加工液溜め用ポンプＰ２は加工液溜め用ポンプ用インバータＩ２により駆動される。以上のように、第１の実施形態においては、加工液供給管路Ｌａおよび加工用加工液供給管路Ｌｂを介して、清水槽７から加工槽２に加工液が供給される。   The machining fluid supply pump P1 is driven by the machining fluid supply pump inverter I1, and the machining fluid reservoir pump P2 is driven by the machining fluid reservoir pump inverter I2. As described above, in the first embodiment, the processing liquid is supplied from the fresh water tank 7 to the processing tank 2 via the processing liquid supply pipe La and the processing liquid supply pipe Lb.

加工液溜め用ポンプＰ２を駆動することにより加工液供給管路Ｌａから加工槽２内に供給される加工液の量は、温度センサ１０で検出された検出水温値Ｔｄに基づいて調節される。制御装置１では、温度センサ１０により検知された加工槽２内の加工液の検出水温値Ｔｄと予め制御装置１内に設定した基準水温値Ｔｔｈとの差（Ｔｄ−Ｔｔｈ）である差分値ΔＴを算出する。検出された加工液の検出水温値Ｔｄが基準水温値Ｔｔｈより高い場合（ΔＴ＞０）、制御装置１は差分値ΔＴに応じた単位時間あたりの流量で加工液を清水槽７から加工槽２に供給するように制御する。清水槽７から加工槽２に供給される加工液の水温は、温度センサ１０で検出される加工液の温度より低くなるように、清水槽７内の加工液の水温は加工液冷却装置９により制御される。   The amount of the machining liquid supplied from the machining liquid supply line La into the machining tank 2 by driving the machining liquid reservoir pump P <b> 2 is adjusted based on the detected water temperature value Td detected by the temperature sensor 10. In the control device 1, a difference value ΔT, which is a difference (Td−Tth) between the detected water temperature value Td of the processing liquid in the processing tank 2 detected by the temperature sensor 10 and the reference water temperature value Tth set in the control device 1 in advance. Is calculated. When the detected water temperature value Td of the detected processing liquid is higher than the reference water temperature value Tth (ΔT> 0), the control device 1 supplies the processing liquid from the fresh water tank 7 to the processing tank 2 at a flow rate per unit time according to the difference value ΔT. Control to supply. The water temperature of the processing liquid in the fresh water tank 7 is adjusted by the processing liquid cooling device 9 so that the water temperature of the processing liquid supplied from the fresh water tank 7 to the processing tank 2 is lower than the temperature of the processing liquid detected by the temperature sensor 10. Be controlled.

ここで、加工液溜め用ポンプＰ２を用いて加工槽２内へ単位時間あたりに供給する加工液の量の制御方法を説明する。温度センサ１０により検知された加工槽２内の加工液の検出水温値Ｔｄが基準水温値Ｔｔｈに対しどの程度高いか、つまり、差分値ΔＴの大きさに比例して、加工液溜め用ポンプＰ２の回転数をインバータＩ２の周波数で増減させることにより加工槽２に供給する加工液の量を調整する。差分値ΔＴの大きさが小さい時には、インバータＩ２の周波数を低くして加工液溜め用ポンプＰ２の回転数を低くし、その結果、清水槽７から加工槽２への加工液の供給は少なくなる。一方、差分値ΔＴが大きい時には、インバータＩ２の周波数を高くして加工液溜め用ポンプＰ２の回転数を高くし、清水槽７から加工槽２へ供給する加工液の供給は多くなる。   Here, a method of controlling the amount of machining liquid supplied per unit time into the machining tank 2 using the machining liquid reservoir pump P2 will be described. How much the detected water temperature value Td of the processing liquid in the processing tank 2 detected by the temperature sensor 10 is higher than the reference water temperature value Tth, that is, in proportion to the magnitude of the difference value ΔT, the processing liquid reservoir pump P2 The amount of machining liquid supplied to the machining tank 2 is adjusted by increasing / decreasing the number of rotations at the frequency of the inverter I2. When the difference value ΔT is small, the frequency of the inverter I2 is lowered to lower the rotational speed of the machining liquid reservoir pump P2, and as a result, the supply of the machining liquid from the fresh water tank 7 to the machining tank 2 is reduced. . On the other hand, when the difference value ΔT is large, the frequency of the inverter I2 is increased to increase the rotational speed of the processing liquid reservoir pump P2, and the supply of the processing liquid supplied from the fresh water tank 7 to the processing tank 2 increases.

差分値ΔＴが負の値または０となる場合、換言すれば、温度センサ１０により検知された加工槽２内の検出水温値Ｔｄが基準水温値Ｔｔｈ以下の場合は、加工液溜め用ポンプＰ２を用いた加工槽２内への加工液の供給を行わない。
あるいは、制御装置１内に予め許容差分値Δｔ（ただし、Δｔ≧０）を適宜の値に設定できるようにしておく。そして、該許容差分値Δｔ（ただし、許容差分値Δｔは０より大きい適宜の値）を超える場合には、上述したように、前記差分値ΔＴの大きさに比例して、加工液溜め用ポンプＰ２の回転数をインバータＩ２の周波数で増減させることにより加工槽２に供給する加工液の量を調整する。そして、加工槽２内の水温と基準水温値Ｔｔｈとの差が許容差分値Δｔ以下の場合には、加工液溜め用ポンプＰ２の駆動を行わないようにし、加工液溜め用ポンプＰ２が頻繁にオン、オフの動作の切り替えがなされないようにできる。 When the difference value ΔT is a negative value or 0, in other words, when the detected water temperature value Td in the processing tank 2 detected by the temperature sensor 10 is equal to or lower than the reference water temperature value Tth, the processing liquid reservoir pump P2 is turned on. The machining fluid is not supplied into the used processing tank 2.
Alternatively, the allowable difference value Δt (where Δt ≧ 0) can be set to an appropriate value in the control device 1 in advance. If the allowable difference value Δt (where the allowable difference value Δt is an appropriate value larger than 0) is exceeded, as described above, the machining fluid reservoir pump is proportional to the difference value ΔT. The amount of machining liquid supplied to the machining tank 2 is adjusted by increasing or decreasing the rotational speed of P2 at the frequency of the inverter I2. When the difference between the water temperature in the processing tank 2 and the reference water temperature value Tth is equal to or smaller than the allowable difference value Δt, the machining liquid reservoir pump P2 is not driven, and the machining liquid reservoir pump P2 is frequently used. It is possible to prevent the on / off operation from being switched.

以上の加工液の供給方法を採用することによって、加工槽２内の加工液の水温に応じて、加工槽２内に加工液を必要な時に必要な量を供給することが可能となり、加工槽２内の水温を最短で自動的に均一かつ一定に保つことができるとともに、加工液溜め用ポンプＰ２やその他の加工用加工液供給ポンプＰ１の不要な動作を無くして電力の低減を図ることができる。   By adopting the above processing liquid supply method, it becomes possible to supply the processing liquid into the processing tank 2 when necessary according to the water temperature of the processing liquid in the processing tank 2. 2 can automatically and uniformly keep the water temperature in the shortest time, and can reduce electric power by eliminating unnecessary operations of the machining liquid reservoir pump P2 and the other machining liquid supply pump P1. it can.

図２は、第１の実施形態における加工液の温度制御を行う処理のアルゴリズムを示すフローチャートである。この処理は、制御周期毎に行う処理である。以下、各ステップに従って説明する。
●［ステップＳＡ１］加工槽内の加工液の水温を温度センサで検知し、検出水温値Ｔｄを取得する。
●［ステップＳＡ２］検出水温値Ｔｄと制御装置内に予め設定された基準水温値Ｔｔｈの差分値ΔＴを求める。
●［ステップＳＡ３］差分値ΔＴは制御装置内に予め設定された許容差分値Δｔ（≧０）より大きいか否か判断し、前記許容差分値Δｔより大きい場合はステップＳＡ４へ移行し、前記許容差分値Δｔ以下の場合はステップＳＡ５へ移行する。
●［ステップＳＡ４］加工液溜め用ポンプの回転数を差分値ΔＴに比例するように加工液溜め用ポンプを駆動し、今回の制御周期の処理を終了する。
●［ステップＳＡ５］加工液溜め用ポンプの駆動を停止し、今回の制御周期の処理を終了する。 FIG. 2 is a flowchart showing an algorithm of processing for controlling the temperature of the machining fluid in the first embodiment. This process is a process performed for each control cycle. Hereinafter, it demonstrates according to each step.
[Step SA1] The temperature of the processing liquid in the processing tank is detected by a temperature sensor, and a detected water temperature value Td is acquired.
[Step SA2] A difference value ΔT between the detected water temperature value Td and a reference water temperature value Tth preset in the control device is obtained.
[Step SA3] It is determined whether or not the difference value ΔT is larger than a permissible difference value Δt (≧ 0) preset in the control device. If it is equal to or less than the difference value Δt, the process proceeds to step SA5.
[Step SA4] The machining fluid reservoir pump is driven so that the rotational speed of the machining fluid reservoir pump is proportional to the difference value ΔT, and the processing of the current control cycle is completed.
[Step SA5] The driving of the machining fluid reservoir pump is stopped, and the processing of the current control cycle is terminated.

上述したように、第１の実施形態の構成では、加工液を加工槽２へ供給する配管（Ｌａ、Ｌｂ）と加工液を冷却する加工液冷却装置９の配管（Ｌｄ、Ｌｅ）は各々独立した配管であるので、加工槽２への加工液の供給動作と加工液冷却装置９の作動とを同期させる必要がない。   As described above, in the configuration of the first embodiment, the pipes (La, Lb) for supplying the machining liquid to the machining tank 2 and the pipes (Ld, Le) of the machining liquid cooling device 9 for cooling the machining liquid are independent of each other. Therefore, it is not necessary to synchronize the operation of supplying the machining liquid to the machining tank 2 and the operation of the machining liquid cooling device 9.

一方、前述したように、加工用加工液供給ポンプＰ１を駆動することにより、清水槽７からの加工液を上下ワイヤ電極ガイド８に噴流する。加工用加工液供給ポンプＰ１は、制御装置１により制御されるインバータＩ１により駆動される。制御装置１は、ワークの加工条件（例えば、ワークの荒加工か、仕上げ加工か）によって、単位時間あたりの流量を制御する。   On the other hand, as described above, the machining fluid supply pump P <b> 1 is driven to jet the machining fluid from the fresh water tank 7 to the upper and lower wire electrode guides 8. The machining fluid supply pump P <b> 1 for processing is driven by an inverter I <b> 1 controlled by the control device 1. The control device 1 controls the flow rate per unit time according to the workpiece machining conditions (for example, rough machining or finishing machining of the workpiece).

次に、本発明の第２の実施形態を説明する。なお、第１の実施形態と第２の実施形態で同じまたは類似する構成については同一の符号を用いて説明する。図３は、本発明の第２の実施形態の概略ブロック図である。第２の実施形態は、図３に示されるように、加工液溜め用ポンプＰ２から加工槽２への加工液供給管路Ｌａの途中を分岐してバイパス用管路Ｌａ３を設け、流量調整機構である流量調節バルブ１１を介して清水槽７へ戻る流路を形成する。   Next, a second embodiment of the present invention will be described. Note that the same or similar configurations in the first embodiment and the second embodiment will be described using the same reference numerals. FIG. 3 is a schematic block diagram of the second embodiment of the present invention. In the second embodiment, as shown in FIG. 3, a bypass pipe La3 is provided by branching in the middle of the machining liquid supply pipe La from the machining liquid reservoir pump P2 to the machining tank 2, and a flow rate adjusting mechanism. The flow path which returns to the fresh water tank 7 through the flow control valve 11 which is is formed.

流量調節バルブ１１は、制御装置１によって制御される電動機構もしくは空圧機構で開閉駆動され、バイパス用管路Ｌａ３を流れる加工液の量を調整する。この時、加工槽２へ加工液を供給する加工液溜め用ポンプＰ２は常に最大回転数で運転し、バイパス用管路Ｌａ３を流れた加工液は、清水槽７に戻る。第２の実施形態では、流量調節は流量調節バルブ１１の開度を制御することによって行うことから、加工液溜め用ポンプＰ２は、駆動源１３としてインバータを用いて回転数を制御する必要はなく、放電加工機のコストを低下することができる。   The flow rate adjusting valve 11 is driven to open and close by an electric mechanism or a pneumatic mechanism controlled by the control device 1 and adjusts the amount of the machining fluid flowing through the bypass conduit La3. At this time, the processing liquid reservoir pump P2 for supplying the processing liquid to the processing tank 2 is always operated at the maximum rotation speed, and the processing liquid flowing through the bypass conduit La3 returns to the fresh water tank 7. In the second embodiment, since the flow rate adjustment is performed by controlling the opening degree of the flow rate adjustment valve 11, the machining liquid reservoir pump P <b> 2 does not need to control the rotation speed using an inverter as the drive source 13. The cost of the electric discharge machine can be reduced.

そして、温度センサ１０で検出された検出水温値Ｔｄと基準水温値Ｔｔｈの差分値ΔＴの絶対値が小さい時には、流量制御調節機構である流量調節バルブ１１が開いてバイパス用管路Ｌａ３に流れる加工液の流量を増加させ、それにより、加工槽２に供給する加工液の量を少なくする。   When the absolute value of the difference value ΔT between the detected water temperature value Td detected by the temperature sensor 10 and the reference water temperature value Tth is small, the flow rate adjusting valve 11 that is a flow rate control adjusting mechanism is opened and flows into the bypass line La3. The flow rate of the liquid is increased, thereby reducing the amount of the processing liquid supplied to the processing tank 2.

一方、差分値ΔＴが大きい場合には、流量調節バルブ１１の開度を小さくしてバイパス用管路Ｌａ３に流れる加工液の流量を減少させ、それにより加工槽に供給する加工液の量を多くすることとなる。   On the other hand, when the difference value ΔT is large, the opening amount of the flow rate adjusting valve 11 is reduced to reduce the flow rate of the machining fluid flowing in the bypass pipeline La3, thereby increasing the amount of machining fluid supplied to the machining tank. Will be.

これにより、差分値ΔＴに基づいて流量調節バルブ１１を自動的に制御し、加工槽２に供給する加工液の量を最適に調節することができる。   Thereby, the flow rate adjusting valve 11 can be automatically controlled based on the difference value ΔT, and the amount of the processing liquid supplied to the processing tank 2 can be optimally adjusted.

もし、温度センサ１０で検出された検出水温値Ｔｄが基準水温値Ｔｔｈ以下の場合、すなわち、前記差分が０または負の値となる場合には、加工槽２への加工液の供給は不要と判定して加工液の供給を、加工液供給管路Ｌａを介して行わない。すなわち、加工液溜め用ポンプＰ２の駆動を停止する。
あるいは、制御装置１内に予め許容差分値Δｔ（ただし、Δｔ≧０）を適宜の値に設定できるようにしておく。そして、該許容差分値Δｔ（ただし、許容差分値Δｔは０より大きい適宜の値）を超える場合には、上述したように、前記差分値ΔＴの大きさに比例して、流量調節バルブ１１を自動的に制御し、加工槽２に供給する加工液の量を最適に調節する。そして、加工槽２内の水温と基準水温値Ｔｔｈとの差が許容差分値Δｔ以下の場合には、加工液溜め用ポンプＰ２の駆動を行わないようにし、流量調節バルブ１１の頻繁な開度変更の動作や、加工液溜め用ポンプＰ２が頻繁にオン、オフの動作の切り替えがなされないようにすることできる。 If the detected water temperature value Td detected by the temperature sensor 10 is equal to or lower than the reference water temperature value Tth, that is, if the difference is 0 or a negative value, it is not necessary to supply the processing liquid to the processing tank 2. Determination and supply of the machining fluid are not performed via the machining fluid supply line La. That is, the driving of the processing liquid reservoir pump P2 is stopped.
Alternatively, the allowable difference value Δt (where Δt ≧ 0) can be set to an appropriate value in the control device 1 in advance. If the allowable difference value Δt (where the allowable difference value Δt is an appropriate value larger than 0) is exceeded, the flow rate adjusting valve 11 is set in proportion to the difference value ΔT as described above. The amount of machining liquid supplied to the processing tank 2 is optimally adjusted by automatically controlling. When the difference between the water temperature in the processing tank 2 and the reference water temperature value Tth is equal to or smaller than the allowable difference value Δt, the processing liquid reservoir pump P2 is not driven, and the flow rate adjustment valve 11 is frequently opened. It is possible to prevent the change operation and the working fluid reservoir pump P2 from being frequently switched on and off.

図４は、第２の実施形態における加工液の温度制御を行う処理のアルゴリズムを示すフローチャートである。この処理は、制御周期毎に行う処理である。以下、各ステップに従って説明する。
●［ステップＳＢ１］加工槽内の加工液の水温を温度センサで検知し、検出水温値Ｔｄを取得する。
●［ステップＳＢ２］検出水温値Ｔｄと制御装置内に予め設定された基準水温値Ｔｔｈの差分値ΔＴを求める。
●［ステップＳＢ３］差分値ΔＴは制御装置内に予め設定された許容差分値Δｔ（≧０）より大きいか否か判断し、前記許容差分値Δｔより大きい場合はステップＳＢ４へ移行し、前記許容差分値Δｔ以下の場合はステップＳＢ５へ移行する。
●［ステップＳＢ４］加工槽への加工液の供給が差分値ΔＴに比例するように流量調節バ
ルブの開度を制御し、今回の制御周期の処理を終了する。
●［ステップＳＢ５］加工液溜め用ポンプの駆動を停止し、今回の制御周期の処理を終了する。 FIG. 4 is a flowchart showing an algorithm of processing for controlling the temperature of the machining fluid in the second embodiment. This process is a process performed for each control cycle. Hereinafter, it demonstrates according to each step.
[Step SB1] The temperature of the processing liquid in the processing tank is detected by the temperature sensor, and the detected water temperature value Td is acquired.
[Step SB2] A difference value ΔT between the detected water temperature value Td and a reference water temperature value Tth preset in the control device is obtained.
[Step SB3] It is determined whether or not the difference value ΔT is larger than a preset allowable difference value Δt (≧ 0) in the control device. If the difference value ΔT is larger than the allowable difference value Δt, the process proceeds to Step SB4, where the allowable value is set. If it is equal to or smaller than the difference value Δt, the process proceeds to step SB5.
[Step SB4] The opening of the flow rate adjusting valve is controlled so that the supply of the machining fluid to the machining tank is proportional to the difference value ΔT, and the process of the current control cycle is terminated.
[Step SB5] The drive of the machining fluid reservoir pump is stopped, and the processing of the current control cycle is completed.

なお、第２の実施形態の構成では、加工液を加工槽２へ供給する配管と加工液を冷却する加工液冷却装置９の配管は各々独立した配管であるので、加工槽２への加工液の供給動作と加工液冷却装置９の作動とを同期させる必要がない。   In the configuration of the second embodiment, the pipe for supplying the machining liquid to the machining tank 2 and the pipe of the machining liquid cooling device 9 for cooling the machining liquid are independent pipes. It is not necessary to synchronize the supply operation and the operation of the machining liquid cooling device 9.

一方、前述したように、加工用加工液供給ポンプＰ１を駆動することにより、清水槽７からの加工液を上下ワイヤ電極ガイド８に噴流する。加工用加工液供給ポンプＰ１は、制御装置１により制御されるインバータＩ１により駆動される。制御装置１は、ワークの加工条件（例えば、ワークの荒加工か、仕上げ加工か）によって、単位時間あたりの流量を制御する。   On the other hand, as described above, the machining fluid supply pump P <b> 1 is driven to jet the machining fluid from the fresh water tank 7 to the upper and lower wire electrode guides 8. The machining fluid supply pump P <b> 1 for processing is driven by an inverter I <b> 1 controlled by the control device 1. The control device 1 controls the flow rate per unit time according to the workpiece machining conditions (for example, rough machining or finishing machining of the workpiece).

なお、図１、図３において、加工液溜め用ポンプＰ２は、清水槽７から加工液を汲み上げ、加工槽２に供給するようにしているが、汚水槽３から加工液を汲み上げ加工槽２へ供給するようにしてもよい。加工槽２内で温められた加工液は、汚水槽２から加工液ドレイン部１２を介して汚水槽３へ排出され汚水槽３内で自然冷却により冷却されていることから、汚水槽３内の加工液を加工槽２へ供給してもよい。   In FIGS. 1 and 3, the processing liquid reservoir pump P <b> 2 pumps the processing liquid from the fresh water tank 7 and supplies it to the processing tank 2, but pumps the processing liquid from the sewage tank 3 to the processing tank 2. You may make it supply. Since the processing liquid heated in the processing tank 2 is discharged from the sewage tank 2 to the sewage tank 3 through the processing liquid drain 12 and cooled in the sewage tank 3 by natural cooling, The processing liquid may be supplied to the processing tank 2.

１ 制御装置
２ 加工槽
３ 汚水槽
４ コラム
５ 隔壁
６ アーム
７ 清水槽
８ 上下ワイヤ電極ガイド
９ 加工液冷却装置
１０ 温度センサ
１１ 流量調節バルブ
１２ 加工液ドレイン部
１３ 駆動源
Ｐ１ 加工用加工液供給ポンプ
Ｐ２ 加工液溜め用ポンプ
Ｌａ 加工液供給管路
Ｌａ１ 加工槽側面側加工液溜め用管路
Ｌａ２ アーム先端加工液溜め用管路
Ｌａ３ バイパス用管路
Ｌｂ 加工用加工液供給管路
Ｔｔｈ 基準水温値
Ｔｄ 検出水温値
ΔＴ 差分値
Δｔ 許容差分値 DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Processing tank 3 Sewage tank 4 Column 5 Bulkhead 6 Arm 7 Fresh water tank 8 Upper and lower wire electrode guide 9 Processing liquid cooling device 10 Temperature sensor 11 Flow control valve 12 Processing liquid drain part 13 Drive source P1 Processing liquid supply pump for processing P2 machining fluid reservoir pump La machining fluid supply pipeline La1 machining tank side surface machining fluid reservoir pipeline La2 arm tip machining fluid reservoir pipeline La3 bypass pipeline Lb machining fluid supply pipeline Tth reference water temperature value Td Detected water temperature value ΔT Difference value Δt Allowable difference value

Claims (4)

加工槽と、該加工槽の加工液ドレイン部から流出した加工液を回収および貯留する汚水槽と、該汚水槽の加工液をフィルタを通した後に貯留する清水槽と、該清水槽の加工液を冷却する加工液冷却装置と、前記加工槽に加工液を貯留するため、前記清水槽または前記汚水槽の加工液を前記加工槽に供給するための加工液溜め用ポンプと、前記清水槽の加工液を上下ワイヤ電極ガイドに供給する加工用加工液供給ポンプと、前記加工液溜め用ポンプと前記加工用加工液供給ポンプとを制御する制御装置を備えたワイヤカット放電加工機であって、
前記加工槽内に配設され加工液の液温を検出する温度センサと、
該温度センサにより検知された前記加工液の温度と、前記制御装置に予め設定された基準温度との差分値を求める温度差算出手段と、
該温度差算出手段で求められた差分値が前記制御装置に予め設定された許容差分値（≧０）より大きいか否かに基づいて前記加工槽に加工液を供給するか否かを判断する判断手段と、
前記判断手段により前記差分値が前記許容差分値より大きいと判断された場合には、前記温度差算出手段によって算出された差分値に基づいて前記加工液溜め用ポンプを制御し前記加工槽内に供給する加工液の量を調節し、前記許容差分値以下と判断された場合には、該加工液溜め用ポンプの駆動を停止する加工液流量制御手段と、
を備えたことを特徴とする加工槽内への加工液の供給量を制御し水温一定制御を行うワイヤカット放電加工機。 A processing tank, a sewage tank that collects and stores the processing liquid flowing out from the processing liquid drain of the processing tank, a fresh water tank that stores the processing liquid in the sewage tank after passing through a filter, and a processing liquid in the fresh water tank A processing liquid cooling device for cooling the processing liquid, a processing liquid reservoir pump for supplying the processing liquid in the fresh water tank or the sewage tank to the processing tank in order to store the processing liquid in the processing tank, A wire-cut electric discharge machine equipped with a machining fluid supply pump for supplying machining fluid to the upper and lower wire electrode guides, and a control device for controlling the machining fluid reservoir pump and the machining fluid supply pump.
A temperature sensor disposed in the processing tank for detecting the temperature of the processing liquid;
A temperature difference calculating means for obtaining a difference value between the temperature of the machining fluid detected by the temperature sensor and a reference temperature preset in the control device;
It is determined whether or not to supply the machining liquid to the machining tank based on whether or not the difference value obtained by the temperature difference calculation means is larger than an allowable difference value (≧ 0) preset in the control device. Judgment means,
If the determination means determines that the difference value is greater than the allowable difference value, the processing liquid reservoir pump is controlled based on the difference value calculated by the temperature difference calculation means to enter the processing tank. A machining fluid flow rate control means for adjusting the amount of the machining fluid to be supplied and stopping the driving of the machining fluid reservoir pump when it is determined to be equal to or less than the allowable difference value;
A wire-cut electric discharge machine that controls the supply amount of the machining fluid into the machining tank and performs constant water temperature control. 前記加工液流量制御手段は、前記温度差算出手段によって算出された温度差データに応じて前記加工液溜め用ポンプの回転数を変更し、前記加工機に供給する加工液の量を制御することを特徴とする請求項１に記載の加工槽内への加工液の供給量を制御し水温一定制御を行うワイヤカット放電加工機。   The machining fluid flow rate control unit changes the rotation speed of the machining fluid reservoir pump according to the temperature difference data calculated by the temperature difference calculation unit, and controls the amount of machining fluid supplied to the processing machine. The wire-cut electric discharge machine which controls supply amount of the processing liquid into the processing tank of Claim 1, and performs constant water temperature control. 前記加工液溜め用ポンプから前記加工槽に接続された管路の途中から分岐して前記汚水槽に戻るバイパス用管路を設け、該バイパス用管路の途中に前記加工液の流量を制御するバイパス流量調整装置を備え、
前記加工液流量制御手段は、前記加工液溜め用ポンプを制御し前記加工槽内に供給する加工液の量を調節することに替えて、前記判断手段により前記差分値が前記許容差分値より大きいと判断された場合には、前記温度差算出手段によって算出された差分値に基づいて前記バイパス流量調整装置を制御することによって前記加工槽に供給する加工液の量を調節し、前記許容差分値以下と判断された場合には、該加工液溜め用ポンプの駆動を停止することを特徴とする請求項１に記載の加工槽内への加工液の供給量を制御し水温一定制御を行うワイヤカット放電加工機。 A bypass pipe branching from the middle of the pipe connected to the machining tank from the machining liquid reservoir pump and returning to the sewage tank is provided, and the flow rate of the machining liquid is controlled in the middle of the bypass pipe. Equipped with a bypass flow control device,
The machining fluid flow rate control means controls the machining fluid reservoir pump to adjust the amount of machining fluid supplied into the machining tank, and the determination means makes the difference value larger than the allowable difference value. Is determined, the amount of processing liquid supplied to the processing tank is adjusted by controlling the bypass flow rate adjusting device based on the difference value calculated by the temperature difference calculating means, and the allowable difference value The wire for performing constant water temperature control by controlling the supply amount of the processing liquid into the processing tank according to claim 1, wherein the driving of the processing liquid reservoir pump is stopped when it is determined that Cut electrical discharge machine. 前記温度センサを、加工液ドレイン部、上ガイド、下ガイド、加工槽のいずれかの箇所に備えたことを特徴とする請求項１〜３のいずれか１つに記載の加工槽内への加工液の供給量を制御し水温一定制御を行うワイヤカット放電加工機。   The processing into the processing tank according to any one of claims 1 to 3, wherein the temperature sensor is provided at any one of a processing liquid drain part, an upper guide, a lower guide, and a processing tank. A wire-cut electric discharge machine that controls the amount of liquid supplied and performs constant water temperature control.
JP2009217649A 2009-09-18 2009-09-18 Wire cut electric discharge machine controlling supply amount of working liquid into working tank and performing water temperature-constant control Pending JP2011062800A (en)

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