WO2013121586A1 - 放電加工機及び放電加工方法 - Google Patents
放電加工機及び放電加工方法 Download PDFInfo
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- WO2013121586A1 WO2013121586A1 PCT/JP2012/053863 JP2012053863W WO2013121586A1 WO 2013121586 A1 WO2013121586 A1 WO 2013121586A1 JP 2012053863 W JP2012053863 W JP 2012053863W WO 2013121586 A1 WO2013121586 A1 WO 2013121586A1
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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
- 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
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
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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
- B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
- B23H9/14—Making holes
Definitions
- the present invention relates to an electric discharge machine and an electric discharge machining method.
- the electrode When machining a hole through a workpiece by electrical discharge machining, the electrode is consumed during machining, so it is necessary to set the electrode feed amount in anticipation of the electrode consumption.
- the electrode wear is not always constant, a large amount of electrode consumption must be expected in order to prevent the hole from finishing processing without penetrating the workpiece.
- the amount by which the electrode is protruded after penetrating the workpiece is large, the edge of the hole will be bent, so it is not preferable to increase the amount of protrusion of the electrode more than necessary.
- Patent Document 1 when the maximum voltage is compared in a state where the electrode is being processed and the descent position update is detected, a hole generated by discharge is generated when an event that becomes higher than a specified voltage value continues for a specified number of times or more. A technique for determining penetration has been disclosed.
- the above conventional technology is based on the premise that the maximum voltage decreases during machining, but if the maximum voltage does not fall during machining, it will be almost the same as the maximum voltage after penetration and will not be judged. There was a problem.
- the present invention has been made in view of the above, and an object thereof is to obtain an electric discharge machine and an electric discharge machining method capable of detecting with high accuracy the position where an electrode penetrates a workpiece.
- the present invention applies a voltage between the electrode and the workpiece to generate a discharge while moving the electrode to a command depth to perform hole machining on the workpiece.
- a machining apparatus a penetration determination voltage and a penetration determination duration used to determine whether or not an electrode has penetrated the workpiece, a first projection amount used to determine an electrode projection amount after penetrating the workpiece, and a command depth
- a storage unit that stores the current position, a current coordinate detection unit that detects the current position of the electrode, a discharge voltage detection unit that detects a minimum discharge voltage every predetermined period during the drilling, and a discharge voltage detection
- a penetration detection unit that determines that the electrode has penetrated the workpiece when the minimum voltage detected by the unit is higher than the penetration determination voltage for a penetration determination duration or longer, and a penetration detection unit that determines that the electrode has penetrated the workpiece.
- a calculation unit that calculates a position obtained by adding the first protrusion amount to the current position of the electrode detected by the current coordinate detection unit, and updates the command depth stored in the storage unit at the calculated position.
- the electrode is moved from the current position to the updated command depth.
- the electric discharge machine and the electric discharge machining method according to the present invention can detect the position where the electrode penetrates the workpiece with high accuracy, and can suppress the amount of the electrode penetrating the workpiece protruding from the workpiece to a necessary and sufficient amount. Play.
- FIG. 1 is a diagram showing a configuration of a first embodiment of an electric discharge machine according to the present invention.
- FIG. 2A is a diagram illustrating an example of a change in the amount of electrode feed from the discharge start position.
- FIG. 2B is a diagram illustrating an example of a change in discharge voltage.
- FIG. 3A is a diagram illustrating another example of a change in the amount of electrode feed from the discharge start position.
- FIG. 3B is a diagram illustrating another example of changes in the discharge voltage.
- FIG. 4A is a diagram showing still another example of a change in the amount of electrode feed from the discharge start position.
- FIG. 4B is a diagram showing still another example of a change in discharge voltage.
- FIG. 5 is a diagram illustrating a flow of the penetration determination operation of the electric discharge machine according to the embodiment.
- FIG. 6A is a diagram illustrating an example of a monitor screen of the electric discharge machine being processed.
- FIG. 6B is a diagram illustrating an example of a monitor screen of the electric discharge machine being processed.
- FIG. 7 is a diagram illustrating an example of a monitor screen of the electric discharge machine after the machining is completed.
- FIG. 8 is a diagram illustrating the relationship between the penetration determination voltage and the penetration determination duration.
- FIG. 9 is a diagram showing the configuration of the second embodiment of the electric discharge machine according to the present invention.
- FIG. 1 is a diagram showing a configuration of a first embodiment of an electric discharge machine according to the present invention.
- the electric discharge machine according to the present embodiment includes a machining head 1, a feed mechanism 2, a processing tank 3, a discharge generation unit 4, a discharge detection unit 5, a penetration detection unit 6, a discharge voltage detector 7, a penetration determination voltage / discharge voltage.
- Comparison unit 8 duration detection unit 9, current coordinate detection unit 10, command depth / current position comparison unit 11, processing end determination unit 12, deepest position storage unit 13, exit candidate position determination unit 14, exit candidate position It has a presence / absence determination unit 15, a calculation unit 16, a calculation start command unit 17, a storage unit 18, a penetration position storage unit 19, and a machining control unit 20.
- the storage unit 18 includes a penetration determination voltage 181, a penetration determination duration 182, a dropout determination value 183, a first protrusion amount 184, a second protrusion amount 185, a dropout candidate position 186, a penetration detection position 187, a command depth 188, and The deepest position 189 is stored.
- a work holding base 31 is installed in the processing tank 3.
- a workpiece W is placed on the workpiece holder 31 and immersed in the machining liquid 32.
- the processing head 1 is provided with an electrode 1a.
- a voltage is applied between the electrode 1a and the work holder 31 by the discharge generator 4, a discharge is generated between the electrode 1a and the work W, and the work W is processed.
- the feed mechanism 2 moves the machining head 1, the position of the electrode 1a changes.
- the discharge between the electrode 1 and the workpiece W is detected by the discharge detection unit 5 and the penetration detection unit 6 is notified that the discharge has occurred.
- the voltage value (discharge voltage) of the voltage applied between the electrode 1a and the work holding table 31 is detected by the discharge voltage detector 7.
- the penetration determination voltage / discharge voltage comparison unit 8 includes the minimum value of the discharge voltage detected by the discharge voltage detection unit 7 during a predetermined period (one cycle of penetration determination) and the penetration determination voltage 181 stored in the storage unit 18. And the comparison result is output to the duration detection unit 9.
- the determination voltage / discharge voltage comparison unit 8 may select the minimum value of the discharge voltage in one cycle of penetration determination and compare it with the penetration determination voltage 181. Further, a minimum discharge voltage detection unit (not shown) is provided between the discharge voltage detection unit 7 and the penetration determination voltage / discharge voltage comparison unit 8, and only the minimum value of the discharge voltage in one cycle of penetration determination is determined as the penetration determination voltage. -You may make it input into the discharge voltage comparison part 8, and you may make it compare with the penetration determination voltage 181. FIG. On the other hand, when the discharge voltage detection unit 7 outputs the detection result at every predetermined time (sampling period), only the minimum value of the discharge voltage may be output to the penetration determination voltage / discharge voltage comparison unit 8. good.
- the duration detection unit 9 measures the time during which the state in which the minimum value of the discharge voltage exceeds the penetration determination voltage 181 continues.
- the penetration detection unit 6 determines that the electrode 1a has penetrated the workpiece W when the time measured by the duration detection unit 9 exceeds the penetration determination duration 182. In other words, the penetration detection unit 6 detects that the electrode 1a is turned on when the minimum voltage detected by the discharge voltage detection unit 7 is higher than the preset penetration determination voltage 181 for a predetermined period (the penetration determination duration 182 or more). It is determined that W has been penetrated.
- the penetration determining unit 6 outputs the penetration detection result to the calculation start command unit 17.
- the current coordinate detection unit 10 detects the current coordinate position of the machining head 1 (electrode 1a).
- the command depth / current position comparison unit 11 compares the current position of the electrode 1 a detected by the current coordinate detection unit 10 with the command depth 188 stored in the storage unit 18.
- the processing end determination unit 12 determines whether or not the processing is to end based on the determination result of the command depth / current position comparison unit 11.
- the deepest position storage unit 13 stores the position where the electrode 1a is closest to the command depth 188 in the storage unit 18 as the deepest position 189 based on the current coordinate position detected by the current coordinate detection unit 10.
- the exit candidate position determination unit 14 detects the exit of the deepest position 189 based on the deepest position 189 stored in the storage unit 18, the exit determination value 183, and the current coordinate position input from the current coordinate detection unit 10. It is determined whether or not the position is a candidate. If the deepest position 189 is a position that is a candidate for removal, the dropout candidate position determination unit 14 stores it in the storage unit 18 as a dropout candidate position 186. The missing candidate position determination unit 15 determines whether the missing candidate position 186 is stored in the storage unit 18, and outputs the determination result to the calculation unit 16.
- the calculation start command unit 17 outputs a calculation start command to the calculation unit 16 according to the penetration detection result input from the penetration detection unit 6.
- the calculation unit 16 receives the first protrusion amount 184, the second protrusion amount 185, the dropout candidate position 186, the penetration detection position 187, and the dropout candidate position presence / absence determination unit 15 stored in the storage unit 18. Based on the command depth, the command depth 188 is calculated and stored in the storage unit 18.
- the penetration position storage unit 19 penetrates the position specified by the current coordinate position input from the current coordinate detection unit 10 when penetration is detected based on the penetration detection result input from the penetration detection unit 6.
- the detected position 187 is stored in the storage unit 18.
- the machining control unit 20 sends a command to the feed mechanism 2 and the discharge generation unit 4 by executing the NC program, moves the machining head 1 (electrode 1a), and turns on the discharge between the electrode 1a and the workpiece W. / OFF.
- the electric discharge machine machines the workpiece W under the control of the machining control unit 20.
- FIG. 2A is a diagram showing an example of a change in the feed amount of the electrode from the discharge start position, the horizontal axis is the time (sec) from the start of the program, and the vertical axis is the feed amount in the depth direction from the workpiece upper surface ( mm).
- FIG. 2B is a diagram illustrating an example of changes in the discharge voltage, where the horizontal axis represents time (sec) from the start of the program, and the vertical axis represents voltage (V).
- the machining control unit 20 detects machining instability and performs control to temporarily raise the electrode 1a before the electrode 1a penetrates the workpiece W due to a change in discharge pulse or voltage. .
- the machining control unit 20 lowers the electrode 1a again after about 70 seconds have elapsed from the start of the program, and when the feed amount in the depth direction reaches a certain value (when 80 seconds have elapsed since the start of the program). Later, almost no discharge occurs and the discharge voltage rises.
- the machining control unit 20 performs the ascending operation of the electrode 1a as described above, there is a possibility that the electrode 1a has been sent to a position deeper than the current electrode position in the past. Therefore, the penetration position can be accurately detected by detecting the depth immediately before the electrode 1a penetrates the workpiece W. That is, by updating and storing the deepest position 189 of the electrode 1a in real time during processing, the removal candidate position determination unit 14 determines that the difference between the deepest position 189 and the current position is a predetermined value or more.
- the deepest position 189 can be set as a candidate position 186 when exiting.
- FIG. 3A is a diagram showing another example of the change in the amount of electrode feed from the discharge start position, where the horizontal axis is the time (sec) from the start of the program, and the vertical axis is the feed in the depth direction from the workpiece top surface. It represents the quantity (mm).
- FIG. 3B is a diagram showing another example of changes in the discharge voltage, where the horizontal axis represents time (sec) from the start of the program, and the vertical axis represents voltage (V). Since the discharge voltage does not decrease before the electrode 1a penetrates the workpiece W, the machining control unit 20 does not perform the ascending operation of the electrode 1a. In this example, the difference between the maximum value of the discharge voltage during discharge and the discharge voltage after the electrode 1a penetrates the workpiece W is small.
- Patent Document 1 determines penetration based on the maximum value of the discharge voltage cannot detect that the electrode has penetrated the workpiece.
- penetration is determined based on the minimum value of the discharge voltage, it can be detected that the electrode 1a has penetrated the workpiece W even under such processing conditions.
- FIG. 4A is a diagram showing still another example of the change in the electrode feed amount from the discharge start position, where the horizontal axis is the time (sec) from the start of the program, and the vertical axis is the depth direction from the workpiece top surface. It represents the feed amount (mm).
- FIG. 4B is a diagram showing still another example of changes in the discharge voltage, where the horizontal axis represents time (sec) from the start of the program, and the vertical axis represents voltage (V). Since the discharge voltage does not decrease before the electrode 1a penetrates the workpiece W, the machining control unit 20 does not perform the ascending operation of the electrode 1a. Also in this example, the difference between the maximum value of the discharge voltage during discharge and the discharge voltage after the electrode 1a penetrates the workpiece W is small.
- Patent Document 1 determines penetration based on the maximum value of the discharge voltage cannot detect that the electrode has penetrated the workpiece.
- penetration is determined based on the minimum value of the discharge voltage, it can be detected that the electrode 1a has penetrated the workpiece W even under such processing conditions.
- FIG. 5 is a diagram illustrating a flow of the penetration determining operation of the electric discharge machine according to the embodiment.
- the penetration determining operation of the electric discharge machine will be described based on FIG.
- “deep” means that the electrode 1a is close to the command depth (target coordinate), and that the depth value (coordinate value) is large means that the electrode 1a is commanded. It means approaching the depth.
- the initial setting (the command depth 188, the first protrusion amount 184, the second protrusion amount 185, the penetration determination voltage 181, the break-off determination value 183, and the penetration determination duration 182 in the storage unit 18) Registration) (step S101).
- the machining control unit 20 executes the NC program and starts machining (step S102).
- the command depth / current position comparison unit 11 compares the current coordinate position input from the current position detection unit 10 with the command depth 188 (step S103). If the command depth 188 is equal to or greater than the current coordinate position (the electrode 1a is at a position deeper than the command depth 188) (step S103 / Yes), the processing is terminated.
- step S104 If the command depth 188 is less than the current coordinate position (the electrode 1a is at a position shallower than the command depth 188) (step S103 / No), the discharge between the electrode 1a and the workpiece W is detected by the discharge detector 5. Is detected (step S104). If the discharge detector 5 has not detected a discharge (step S104 / No), step S104 is repeated until a discharge is detected.
- the discharge voltage detector 7 detects the discharge voltage between the electrode 1a and the workpiece W (step S105).
- the deepest position storage unit 13 determines whether the current position coordinate of the electrode 1a detected by the current position detection unit 10 updates the deepest position (step S106).
- the deepest position is updated (step S106 / Yes)
- the deepest position 189 stored in the storage unit 18 is overwritten (step S107).
- the penetration determination voltage / discharge voltage comparison unit 8 checks whether the minimum value of the discharge voltage is equal to or higher than the penetration determination voltage 181 (step S108).
- the duration for which the minimum value of the discharge voltage is equal to or higher than the penetration determination voltage is increased by the measurement interval (step S109).
- the penetration detection unit 6 determines whether the duration is equal to or longer than the penetration determination duration 182 stored in the storage unit 18 (step S110). If the duration when the minimum value of the discharge voltage is equal to or greater than the penetration determination voltage is equal to or greater than the penetration determination duration 182 stored in the storage unit 18 (step S110 / Yes), the penetration detection unit 6 uses the electrode 1a as the workpiece W. Is determined to have penetrated (step S111).
- the missing position candidate position determination unit 14 determines whether or not the current coordinate value is equal to or greater than the coordinate value obtained by adding the removed position determination value 183 to the deepest position. (Step S115). If the current coordinate value is greater than or equal to the coordinate value obtained by adding the escape determination value 183 to the deepest position (step S115 / Yes), the deepest position is stored in the storage unit 18 as the escape candidate position 186 (step S116). If the current coordinate value is less than the coordinate value obtained by adding the drop-out determination value 183 to the deepest position (step S115 / No), the process proceeds to step S103.
- step S108 If the minimum value of the discharge voltage is less than the penetration determination voltage 181 (step S108 / No), the duration is set to zero (step S117). Thereafter, the process proceeds to step S103.
- the duration is set to zero when the minimum value of the discharge voltage becomes less than the penetration determination voltage.
- the number of times that the minimum value of the discharge voltage becomes less than the penetration determination voltage 181 during a certain time It is also possible to operate so that the duration is not zero when is less than a predetermined number of times.
- the removal candidate position presence / absence determination unit 15 determines whether or not the removal candidate position 186 is stored in the storage unit 18 (Step S1). S112). If the missing position candidate position 186 is stored in the storage unit 18 (Step S112 / Yes), the calculation start command unit 17 calculates a coordinate position obtained by adding the missing position candidate position 186 and the first protrusion amount 184. The command depth 188 is stored in the storage unit 18 (step S113). If the exit candidate position 186 is not stored in the storage unit 18 (step S112 / No), the calculation start command unit 17 calculates a coordinate position obtained by adding the penetration detection position 187 and the second protrusion amount 185. The command depth 188 is stored in the storage unit 18 (step S114).
- step S113 After the command depth 188 is updated in step S113 or step S114, a determination is made based on the updated command depth 188 in step S103. As a result, when the updated command depth 188 becomes larger than the current coordinate position (the electrode 1a has reached a position deeper than the command depth 188) (step S103 / Yes), the processing ends.
- FIG. 6A and 6B are diagrams illustrating an example of a monitor screen of the electric discharge machine being processed. Since the workpiece W is immersed in the machining liquid 32, it is difficult to visually check whether or not the electrode 1a has penetrated the workpiece W during machining. However, in this embodiment, when the penetration detection unit 6 detects penetration, the fact is displayed on the monitor screen 60 during machining, so that the user can immediately recognize whether or not a hole has penetrated during machining. . For example, as shown in FIG. 6A, before the penetration of the hole is detected, the penetration detection display icon 61 is set in a non-display state, and when the penetration of the hole is detected, the penetration detection is performed as shown in FIG. 6B. By changing the display icon 61 to the display state, the user can immediately recognize that the hole has penetrated even during processing.
- FIG. 7 is a diagram showing an example of a monitor screen of the electric discharge machine after the machining is completed.
- a plan view of the workpiece W is displayed on the monitor screen 70 after the completion of processing, and a hole that has finished drilling by detecting penetration or a hole that has finished drilling without detecting penetration depends on the difference in color or mark, etc. Displayed separately. That is, whether or not the command depth 188 has been updated and the hole machining has been completed is stored and displayed separately.
- holes that have been successfully detected for penetration and have finished drilling are indicated by ⁇
- unprocessed holes are indicated by ⁇
- holes that have been processed without detecting penetration are indicated by ⁇ . Thereby, it can be easily confirmed later whether the hole which finished processing has penetrated.
- FIG. 8 is a diagram showing the relationship between the penetration determination voltage and the penetration determination duration.
- FIG. 8 represents a condition in which it is difficult to detect the penetration of the hole as it goes rightward or upward, and a condition that the penetration of the hole is easy to detect as it goes leftward or downward.
- the penetration determination voltage and the penetration determination duration value By accurately changing the penetration determination voltage and the penetration determination duration value according to the material and shape of the workpiece W, the thickness of the electrode 1a, the machining voltage, and the like, it is possible to improve the detection accuracy at the time of disconnection or penetration. For example, in the case of the workpiece W having a shape in which the outlet side of the hole is inclined, the penetration can be detected more quickly and accurately by lowering the detection sensitivity (lowering the penetration determination voltage). In addition, when a plurality of workpieces W are stacked and a hole is formed by a single process, a slight gap is generated between the workpieces. Therefore, it is possible to accurately detect penetration of a hole by extending the penetration determination duration time. .
- the electric discharge machine allows the electrode to work when the increase in the discharge voltage when the electrode passes through the workpiece is detected continuously for a predetermined amount or more and for a predetermined time or more. It is judged that it penetrated. That is, the amount of the electrode penetrating the workpiece protruding from the workpiece can be suppressed to a necessary and sufficient amount. For this reason, even when it is desired to make a hole only on one side of the workpiece that is hollow, it is possible to prevent the electrode penetrating one side of the workpiece from processing the other side of the workpiece.
- the hole can be drilled with high accuracy by completing the machining at a coordinate position obtained by adding an amount of protrusion further to the determined removal position.
- the exit hole diameter can be stabilized by making the amount of protrusion after penetration constant. As a result, the occurrence of defects (drilling of holes, etc.) in drilling is reduced, and the yield is improved.
- the calculation unit 16 can detect the consumption amount (consumption rate) of the electrode from the feed amount of the electrode and the thickness of the workpiece W. Is also possible. For example, if the plate thickness of the workpiece W is 10 mm and the electrode feed amount is 11 mm, the electrode wear amount can be detected as 1 mm (wear rate 10%). Thus, the electrode consumption length is clarified from the difference between the plate thickness and the position where the drop is detected without bothering to measure the electrode consumption, so that processing to the next hole can be performed quickly even in continuous drilling. Further, the required electrode length can be calculated even when the plate thickness changes.
- FIG. FIG. 9 is a diagram showing the configuration of the second embodiment of the electric discharge machine according to the present invention.
- the second embodiment is different from the first embodiment in that the discharge voltage averaging unit 21 is provided.
- the discharge voltage averaging unit 21 outputs an average value (average discharge voltage) for a predetermined time based on the discharge voltage detected by the discharge voltage detection unit 7.
- the penetration determination voltage / discharge voltage comparison unit 8 compares the average discharge voltage input from the discharge voltage averaging unit 21 with the penetration determination voltage 181 and outputs the comparison result to the duration detection unit 9.
- Others are the same as in the first embodiment.
- whether or not the electrode has penetrated the workpiece is determined based on the average value of the discharge voltage, so that the determination accuracy can be improved.
- the electric discharge machine and the electric discharge machining method according to the present invention are useful in that the position where the electrode penetrates the workpiece can be detected with high accuracy, and in particular, the hole is formed only on one side of the hollow workpiece. Suitable for processing.
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Abstract
Description
図1は、本発明にかかる放電加工機の実施の形態1の構成を示す図である。本実施の形態にかかる放電加工機は、加工ヘッド1、送り機構2、加工槽3、放電発生部4、放電検出部5、貫通検出部6、放電電圧検出器7、貫通判定電圧・放電電圧比較部8、継続時間検出部9、現在座標検出部10、指令深さ・現在位置比較部11、加工終了判断部12、最深位置記憶部13、抜け際候補位置判定部14、抜け際候補位置有無判定部15、演算部16、演算開始指令部17、記憶部18、貫通位置記憶部19及び加工制御部20を有する。
図9は、本発明にかかる放電加工機の実施の形態2の構成を示す図である。放電電圧平均化部21を有する点で実施の形態1と相違する。放電電圧平均化部21は、放電電圧検出部7が検出した放電電圧を基に一定時間の平均値(平均放電電圧)を出力する。本実施の形態において、貫通判定電圧・放電電圧比較部8は、放電電圧平均化部21から入力される平均放電電圧と貫通判定電圧181とを比較し、比較結果を継続時間検出部9へ出力する。この他については実施の形態1と同様である。
2 送り機構
3 加工槽
4 放電発生部
5 放電検出部
6 貫通検出部
7 放電電圧検出部
8 貫通判定電圧・放電電圧比較部
9 継続時間検出部
10 現在座標検出部
11 指令深さ・現在位置比較部
12 加工終了判断部
13 最深位置記憶部
14 抜け際候補位置判定部
15 抜け際候補位置有無判定部
16 演算部
17 演算開始指令部
18 記憶部
19 貫通位置記憶部
20 加工制御部
21 放電電圧平均化部
31 ワーク保持台
32 加工液
60 加工中のモニタ画面
61 貫通検出表示アイコン
70 加工終了後のモニタ画面
181 貫通判定電圧
182 貫通判定継続時間
183 抜け際判定値
184 第1突き出し量
185 第2突き出し量
186 抜け際候補位置
187 貫通検出位置
188 指令深さ
189 最深位置
Claims (11)
- 電極とワークとの間に電圧を印加して放電を発生させつつ前記電極を指令深さまで移動させて前記ワークに穴加工を施す放電加工装置であって、
前記電極が前記ワークを貫通したか否かの判断に用いる貫通判定電圧及び貫通判定継続時間と、前記ワークを貫通後の前記電極の突き出し量の決定に用いる第1突き出し量と、前記指令深さとが予め記憶される記憶部と、
前記電極の現在位置を検出する現在座標検出部と、
前記穴加工の実行中に所定の期間ごとに前記放電の最小電圧を検出する放電電圧検出部と、
前記放電電圧検出部が検出した最小電圧が前記貫通判定電圧よりも高い状態が前記貫通判定継続時間以上継続した場合に前記電極が前記ワークを貫通したと判断する貫通検出部と、
前記電極が前記ワークを貫通したと前記貫通検出部が判断した時点で、前記現在座標検出部が検出した前記電極の現在位置に前記第1突き出し量を加算した位置を算出し、前記記憶部に記憶されている前記指令深さを前記算出した位置で更新する演算部とを備え、
前記指令深さが更新された場合には、前記電極を前記現在位置から更新後の前記指令深さまで移動させることを特徴とする放電加工機。 - 電極とワークとの間に電圧を印加して放電を発生させつつ前記電極を指令深さまで移動させて前記ワークに穴加工を施す放電加工装置であって、
前記電極が前記ワークを貫通したか否かの判断に用いる貫通判定電圧及び貫通判定継続時間と、前記ワークを貫通後の前記電極の突き出し量の決定に用いる第1突き出し量と、前記指令深さとが予め記憶される記憶部と、
前記電極の現在位置を検出する現在座標検出部と、
前記穴加工の実行中に前記放電の電圧を検出する放電電圧検出部と、
所定の期間ごとに前記放電電圧検出部が検出した前記放電の電圧の平均電圧を算出する放電電圧平均化部と、
前記放電電圧平均化部が算出した平均電圧が前記貫通判定電圧よりも高い状態が前記貫通判定継続時間以上継続した場合に前記電極が前記ワークを貫通したと判断する貫通検出部と、
前記電極が前記ワークを貫通したと前記貫通検出部が判断した時点で、前記現在座標検出部が検出した前記電極の現在位置に前記第1突き出し量を加算した位置を算出し、前記記憶部に記憶されている前記指令深さを前記算出した位置で更新する演算部とを備え、
前記指令深さが更新された場合には、前記電極を前記現在位置から更新後の前記指令深さまで移動させることを特徴とする放電加工機。 - 前記電極が前記ワークを貫通し始めた抜け際状態であるか否かの判断に用いる抜け際判定値と、前記ワークを貫通後の前記電極の突き出し量の決定に用いる第2突き出し量とが前記記憶部に予め記憶され、
前記電極が前記指令深さに最も近づいた最深位置を前記記憶部に記憶させる最深位置記憶部と、
前記座標検出部が検出する現在位置が、前記記憶部に記憶された前記最深位置に前記抜け際判定値を加算した位置よりも前記指令深さに近い場合に、前記現在位置を抜け際候補位置として前記記憶部に記憶させる抜け際候補位置判定部とを備え、
前記演算部は、前記電極が前記ワークを貫通したと前記貫通検出部が判断した時点で前記記憶部に前記抜け際候補位置が記憶されている場合には、前記記憶部に記憶されている前記指令深さを、前記抜け際候補位置に前記第2突き出し量を加算した位置で更新することを特徴とする請求項1又は2に記載の放電加工機。 - 前記指令深さを更新してから前記穴加工を終了した穴であるか否かを前記記憶部に記憶することを特徴とする請求項3に記載の放電加工機。
- モニタ画面上において、前記指令深さを更新してから前記穴加工を終了した穴と、前記指令深さを更新せずに前記穴加工を終了した穴とを区別して表示することを特徴とする請求項4に記載の放電加工機。
- 前記モニタ画面上に、前記指令深さを更新せずに前記穴加工を終了した穴に対する再加工を実行するボタンを表示することを特徴とする請求項5に記載の放電加工機。
- 前記穴加工中に、前記指令深さが更新されたことをリアルタイムに表示することを特徴とする請求項3に記載の放電加工機。
- 前記記憶部に予め記憶された前記ワークの板厚と、前記電極が前記指令深さに到達するまでの送り量とに基づいて、前記電極の消耗率を算出することを特徴とする請求項3に記載の放電加工機。
- 前記所定期間及び前記貫通判定電圧を任意に設定可能であることを特徴とする請求項3に記載の放電加工機。
- 電極とワークとの間に電圧を印加して放電を発生させつつ前記電極を指令深さまで移動させて前記ワークに穴加工を施す放電加工方法であって、
前記電極が前記ワークを貫通したか否かの判断に用いる貫通判定電圧及び貫通判定継続時間と、前記ワークを貫通後の前記電極の突き出し量の決定に用いる第1突き出し量と、前記指令深さとを設定する工程と、
前記電極の現在位置を検出する現在座標検出工程と、
前記穴加工の実行中に所定の期間ごとに前記放電の最小電圧を検出する放電電圧検出工程と、
前記放電電圧検出工程において検出した最小電圧が前記貫通判定電圧よりも高い状態が前記貫通判定継続時間以上継続した場合に前記電極が前記ワークを貫通したと判断する貫通検出工程と、
前記貫通検出工程において前記電極が前記ワークを貫通したと判断した場合に、前記現在座標検出工程において検出した前記電極の現在位置に前記第1突き出し量を加算した位置を算出し、設定されている前記指令深さを前記算出した位置に基づいて更新する工程とを備え、
前記指令深さを更新した場合には、前記電極を前記現在位置から更新後の前記指令深さまで移動させることを特徴とする放電加工方法。 - 前記電極が前記ワークを貫通し始めた抜け際状態であるか否かの判断に用いる抜け際判定値と、前記ワークを貫通後の前記電極の突き出し量の決定に用いる第2突き出し量とを予め設定する工程と、
前記電極が前記指令深さに最も近づいた最深位置を記憶する最深位置記憶工程と、
前記座標検出工程において検出する現在位置が、前記最深位置記憶工程において記憶された前記最深位置に前記抜け際判定値を加算した位置よりも前記指令深さの近い場合に、前記現在位置を抜け際候補位置として記憶する抜け際候補位置判定工程とを備え、
前記貫通検出工程において前記電極が前記ワークを貫通したと判断した時点で前記抜け際候補位置が記憶されている場合には、該抜け際候補位置に前記第2突き出し量を加算した位置で前記指令深さを更新することを特徴とする請求項10に記載の放電加工方法。
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