CN106312216B - Workpiece short circuit detection method in electrolytic machining process - Google Patents
Workpiece short circuit detection method in electrolytic machining process Download PDFInfo
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- CN106312216B CN106312216B CN201610920045.XA CN201610920045A CN106312216B CN 106312216 B CN106312216 B CN 106312216B CN 201610920045 A CN201610920045 A CN 201610920045A CN 106312216 B CN106312216 B CN 106312216B
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- power supply
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- machine tool
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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
- 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
- B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The invention relates to a workpiece short circuit detection method in an electrolytic machining process, which comprises the following steps: 1) arranging an electrolytic machining system; 2) starting an electrolytic machining system, putting a machined workpiece into a machine tool, and transmitting power supply pulses to the workpiece by a pulse power supply; 3) the oscilloscope displays the inter-pulse voltage waveform and transmits the inter-pulse voltage to the judger; 4) if the voltage value between pulses is not zero, entering step 5), otherwise entering step 6); 5) the workpiece is not short-circuited, the pulse power supply continues to normally transmit the next power supply pulse, the machine tool control system controls the machine tool to continue to propel the workpiece, and the step 3) is returned; 6) and (4) when the workpiece is short-circuited, the pulse power supply pulls down the pulse voltage to zero from the next power supply pulse, and the machine tool control system controls the machine tool to stop feeding and return back, and returns to the step 4). The invention can solve the problems of burn caused by short circuit to workpieces in the electrolytic machining process and possible damage caused by large current in the short circuit to the pulse power supply.
Description
Technical Field
The invention relates to a detection method, in particular to a workpiece short circuit detection method in an electrolytic machining process, which is used in the technical field of electrolytic machining.
Background
At present, electrochemical machining is a process method for machining and forming a workpiece by removing redundant materials through electrochemical anodic dissolution of metal in electrolyte. The electrochemical machining removes workpiece materials in an ion mode, has no stress in the machining process, has no remelted layer on the surface of the workpiece, has no loss of a tool electrode and the like, and has great potential in the fields of aerospace parts and micro-machining. However, in the electrolytic machining process, due to the difficulty in updating the electrolyte and removing the electrolytic product, the phenomenon of short circuit and burn easily occurs, and the common methods for detecting the short circuit in the electrolytic machining process are all used for judging by detecting the large current generated in the short circuit process, but when the short circuit occurs, the workpiece is burnt.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for detecting a short circuit of a workpiece during an electrochemical machining process, which solves the problems of burning of the workpiece caused by the short circuit during the electrochemical machining process and the possible damage of a pulse power source caused by a large current during the short circuit.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for detecting short circuit of a workpiece in an electrolytic machining process is characterized by comprising the following steps: 1) arranging an electrolytic machining system which comprises a pulse power supply, an oscilloscope, a judger and a machine tool control system; 2) starting an electrolytic machining system, putting a machined workpiece into a machine tool, and transmitting power supply pulses to the workpiece by a pulse power supply; 3) the oscilloscope displays the inter-pulse voltage waveform between the tool electrode and the workpiece and transmits the inter-pulse voltage to the judger; 4) judging the magnitude of the inter-pulse voltage by a judger, if the inter-pulse voltage value is not zero, entering the step 5), otherwise, entering the step 6); 5) if the workpiece is not short-circuited, the judging device transmits a normal signal to the pulse power supply and the machine tool control system, the pulse power supply continues to normally transmit the next power supply pulse, the machine tool control system controls the machine tool to continue to propel the workpiece, and the step 3 is returned; 6) and (3) when the workpiece is short-circuited, the judging device transmits a short-circuit signal to the pulse power supply and the machine tool control system, the pulse power supply starts to reduce the pulse voltage to zero from the next power supply pulse, the machine tool control system controls the machine tool to stop feeding and return, and the step 3) is returned.
Preferably, in the step 1), the electrolytic machining system comprises a pulse power supply, a tool electrode, an electrolyte, an oscilloscope, an judger and a machine tool control system; one end of the pulse power supply is electrically connected with one end of the tool electrode, the other end of the tool electrode is electrically connected with the electrolyte, a workpiece is arranged in the electrolyte, and one end of the workpiece is electrically connected with the other end of the pulse power supply; one end of the oscilloscope is electrically connected with one end of the tool electrode close to the electrolyte, the other end of the oscilloscope is electrically connected with one end of the workpiece, the oscilloscope is electrically connected with the judger, and the judger is respectively electrically connected with the pulse power supply and the machine tool control system.
Preferably, the machine tool control system is composed of a controller and a machine tool; the controller is electrically connected with the judging device, and the controller is electrically connected with the machine tool.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention judges whether the workpiece has short circuit by detecting whether the voltage between pulses is zero, and reduces the pulse voltage to zero if the short circuit occurs, thereby fundamentally solving the problems that the workpiece is burnt by the short circuit in the electrolytic machining process and the pulse power supply is possibly damaged by the large current during the short circuit. 2. The invention adopts the method for detecting the short circuit of the workpiece in the electrolytic machining process, and has simple and convenient operation and low cost.
Drawings
FIG. 1 is a schematic overall flow diagram of the present invention;
fig. 2 is a schematic structural diagram of the principle of the invention.
Detailed Description
In the pulse power source electrolytic machining, the inter-pulse voltage is not zero when no short circuit occurs in normal machining due to the electric double layer capacitance effect existing between the tool electrode, the electrolyte and the workpiece electrode. The invention utilizes the phenomenon to judge whether the workpiece is short-circuited and burned by electrolytic machining by detecting whether the inter-pulse voltage is zero, if the inter-pulse voltage is not zero, the workpiece is not short-circuited, the next power supply pulse continues to supply high voltage, and the workpiece is continuously machined; if the voltage between pulses is detected to be zero, the workpiece can be judged to have a short circuit, the next power supply pulse pulls down the pulse voltage to zero, and the workpiece is prevented from being burnt by large current generated by high voltage under the condition of short circuit. Thereby fundamentally solving the problems of the burn caused by the short circuit to the workpiece in the electrolytic machining process and the possible damage to the pulse power supply caused by the large current in the short circuit.
The invention is described in detail below with reference to the figures and examples.
As shown in FIG. 1, the invention provides a method for detecting short circuit of a workpiece in an electrolytic machining process, which comprises the following steps:
1) as shown in fig. 2, an electrochemical machining system is provided, which comprises a pulse power supply, an oscilloscope, an judger and a machine tool control system;
2) starting an electrolytic machining system, putting a workpiece into a machine tool, and transmitting power supply pulses to the workpiece by a pulse power supply;
3) the oscilloscope displays the inter-pulse voltage waveform between the tool electrode and the workpiece and transmits the inter-pulse voltage to the judger;
4) judging the magnitude of the inter-pulse voltage by a judger, if the inter-pulse voltage value is not zero, entering the step 5), otherwise, entering the step 6);
5) if the workpiece is not short-circuited, the judging device transmits normal signals to the pulse power supply and the machine tool control system, the pulse power supply continues to normally transmit the next power supply pulse, the machine tool control system controls the machine tool to continue to propel the workpiece, and the step 3 is returned;
6) and (3) when the workpiece is short-circuited, transmitting a short-circuit signal to the pulse power supply and the machine tool control system by the judging device, pulling down the pulse voltage to zero by the pulse power supply from the next power supply pulse, controlling the machine tool to stop feeding and return by the machine tool control system, and returning to the step 3).
In the step 1), the electrochemical machining system comprises a pulse power supply 1, a tool electrode 2, an electrolyte 3, an oscilloscope 4, an judger 5 and a machine tool control system 6. One end of the pulse power supply 1 is electrically connected with one end of the tool electrode 2, the other end of the tool electrode 2 is electrically connected with the electrolyte 3, the workpiece 7 is arranged in the electrolyte 3, and one end of the workpiece 7 is electrically connected with the other end of the pulse power supply 1. One end of an oscilloscope 4 is electrically connected with one end of a tool electrode 2 close to an electrolyte 3, the other end of the oscilloscope 4 is electrically connected with one end of a workpiece 7 and is used for displaying inter-pulse voltage waveforms, the oscilloscope 4 is electrically connected with an estimator 5 and is used for transmitting the inter-pulse voltage to the estimator 5, the estimator 5 judges the inter-pulse voltage, the estimator 5 is respectively electrically connected with a pulse power supply 1 and a machine tool control system 6, a control signal for outputting whether electrolytic machining is short-circuited is transmitted to the pulse power supply 1 and the machine tool control system 6, the pulse power supply 1 controls the next pulse voltage value through the control signal, and the machine tool control system 6 controls the working state of a machine tool according to the received control signal.
In the step 5), the machine tool control system 6 is composed of a controller and a machine tool, the controller is electrically connected with the judger 5 and is used for receiving the control signal transmitted by the judger 5, and the controller is electrically connected with the machine tool and is used for controlling the working state of the machine tool.
The above embodiments are only for illustrating the present invention, and the structure, size, arrangement position and shape of each component can be changed, and on the basis of the technical scheme of the present invention, the improvement and equivalent transformation of the individual components according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (2)
1. A workpiece short circuit detection method in an electrolytic machining process is characterized by comprising the following steps:
1) arranging an electrolytic machining system which comprises a pulse power supply, a tool electrode, electrolyte, an oscilloscope, a judger and a machine tool control system; one end of the pulse power supply is electrically connected with one end of the tool electrode, the other end of the tool electrode is electrically connected with the electrolyte, a workpiece is arranged in the electrolyte, and one end of the workpiece is electrically connected with the other end of the pulse power supply; one end of the oscilloscope is electrically connected with one end of the tool electrode close to the electrolyte, the other end of the oscilloscope is electrically connected with one end of the workpiece, the oscilloscope is electrically connected with the judger, and the judger is electrically connected with the pulse power supply and the machine tool control system respectively;
2) starting an electrolytic machining system, putting a machined workpiece into a machine tool, and transmitting power supply pulses to the workpiece by a pulse power supply;
3) the oscilloscope displays the inter-pulse voltage waveform between the tool electrode and the workpiece and transmits the inter-pulse voltage to the judger;
4) judging the magnitude of the inter-pulse voltage by a judger, if the inter-pulse voltage value is not zero, entering the step 5), otherwise, entering the step 6);
5) if the workpiece is not short-circuited, the judging device transmits a normal signal to the pulse power supply and the machine tool control system, the pulse power supply continues to normally transmit the next power supply pulse, the machine tool control system controls the machine tool to continue to propel the workpiece, and the step 3 is returned;
6) and (3) when the workpiece is short-circuited, the judging device transmits a short-circuit signal to the pulse power supply and the machine tool control system, the pulse power supply starts to reduce the pulse voltage to zero from the next power supply pulse, the machine tool control system controls the machine tool to stop feeding and return, and the step 3) is returned.
2. The method for detecting the short circuit of the workpiece in the electrolytic machining process according to claim 1, wherein: the machine tool control system consists of a controller and a machine tool; the controller is electrically connected with the judging device, and the controller is electrically connected with the machine tool.
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| CN108411342B (en) * | 2018-03-15 | 2019-06-07 | 北方工业大学 | Method and system for predicting electrode short circuit based on pseudo resistance |
| CN108445344B (en) * | 2018-03-15 | 2019-02-22 | 北方工业大学 | Method and system for predicting electrode short circuit based on current |
| CN110744153B (en) * | 2019-11-06 | 2020-12-29 | 南京工程学院 | Micro electrochemical machining fuzzy control method based on short-circuit time |
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| CN1312744A (en) * | 1998-04-06 | 2001-09-12 | 皇家菲利浦电子有限公司 | Method and apparatus for electrochemical machining of workpiece |
| JP2004276188A (en) * | 2003-03-18 | 2004-10-07 | Toto Ltd | Control device and method for micropore electric discharge machine |
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| CN101065209A (en) * | 2004-10-28 | 2007-10-31 | 三菱电机株式会社 | Electric-discharge-machining power supply apparatus and electric discharge machining method |
| CN103658891A (en) * | 2013-12-28 | 2014-03-26 | 哈尔滨工业大学 | Long-short circuit restraining device used in discharge process of computer numerical control wire-cut electric discharge machine |
| CN105121316A (en) * | 2013-02-04 | 2015-12-02 | 安卡有限公司 | Pulse and gap control for electrical discharge machining equipment |
| CN105583479A (en) * | 2016-03-08 | 2016-05-18 | 常州工学院 | Electrolytic and mechanical combined machining servo control method and system based on short circuit rate |
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2016
- 2016-10-21 CN CN201610920045.XA patent/CN106312216B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4602142A (en) * | 1982-06-30 | 1986-07-22 | Mitsubishi Denki Kabushiki Kaisha | Electric discharge system including means to normalize the interpole gap to minimize abnormal discharge conditions |
| CN1312744A (en) * | 1998-04-06 | 2001-09-12 | 皇家菲利浦电子有限公司 | Method and apparatus for electrochemical machining of workpiece |
| JP2004276188A (en) * | 2003-03-18 | 2004-10-07 | Toto Ltd | Control device and method for micropore electric discharge machine |
| CN101065209A (en) * | 2004-10-28 | 2007-10-31 | 三菱电机株式会社 | Electric-discharge-machining power supply apparatus and electric discharge machining method |
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