CN111468795A - Intelligent slow-moving-wire magnetic suspension high-precision size control method - Google Patents
Intelligent slow-moving-wire magnetic suspension high-precision size control method Download PDFInfo
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- CN111468795A CN111468795A CN202010392497.1A CN202010392497A CN111468795A CN 111468795 A CN111468795 A CN 111468795A CN 202010392497 A CN202010392497 A CN 202010392497A CN 111468795 A CN111468795 A CN 111468795A
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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
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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
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- Chemical Kinetics & Catalysis (AREA)
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention discloses an intelligent slow-moving-wire magnetic suspension high-precision size control method, which comprises the following steps of: the method comprises the following steps: the system detects the machining discharge voltage between the workpiece and the tool; step two: one path of signal judges whether the current of each discharge pulse is 'open circuit', 'bias short circuit', 'short circuit' or 'normal processing discharge' according to the discharge time width of the AD790 high-speed integrated circuit inspection pulse, and the other path of signal is sent to an STC60S2 computer to carry out A/D12 bit analog-digital conversion; step three: the AD digital signal is sent to a control system; step four: controlling a position control driver according to a calculation result, and controlling the numerical control system in two ways according to data, wherein one way of control is used for calculating the discharge efficiency according to the discharge data, and the other way of control is used for extracting the speed data of a lower computer; step five: controlling the linear motor to move; step six: the grating ruler detects the actual moving distance and feeds the actual moving distance back to the system to calculate the actual moving error so as to complete the high-precision full-closed control.
Description
Technical Field
The invention relates to the technical field of slow-speed wire cutting, in particular to high-precision size control of slow-speed wire cutting.
Background
At present, various technologies of the slow-running wire cutting machine tool are mostly mastered in foreign enterprises and enterprises in taiwan, China only produces a few individual joint-fund enterprises at present, machine tools produced by most enterprises are mainly controlled by screw semi-closed loop transmission, the size precision control is limited, and the control precision is not easy to stably improve. Therefore, an intelligent slow-moving-wire magnetic suspension high-precision size control method is needed to solve the defects in the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an intelligent slow-moving-wire magnetic suspension high-precision size control method, aiming at solving the problems that the size precision control is limited, and the control precision is not easy to be stably improved.
In order to achieve the purpose, the invention provides the following technical scheme: an intelligent slow-moving-wire magnetic suspension high-precision size control method comprises the following steps:
the method comprises the following steps: the system detects the machining discharge voltage between the workpiece and the tool, and the machining discharge state voltage between the workpiece and the tool reduces the peak value 240V voltage of the machining discharge to 5V voltage without distortion through sampling and voltage reduction;
step two: one path of signal judges whether the current of each discharge pulse is 'open circuit', 'bias short circuit', 'short circuit' or 'normal processing discharge' according to the discharge time width of the AD790 high-speed integrated circuit inspection pulse, and the other path of signal is sent to an STC60S2 computer to carry out A/D12 bit analog-digital conversion;
step three: the AD digital signal is sent to a control system, a computer calculates the discharge state of the machining voltage according to real-time detection data, calculates the machining speed according to a fuzzy control model, and transmits the calculated speed data to an upper 20MA numerical control system at a high speed through an 8-bit data interface;
step four: controlling a position control driver according to a calculation result, and controlling the numerical control system in two ways according to data, wherein one way of control is used for calculating the discharge efficiency according to the discharge data, and the other way of control is used for extracting the speed data of a lower computer;
step five: controlling the linear motor to move;
step six: the grating ruler detects the actual moving distance and feeds the actual moving distance back to the system to calculate the actual moving error so as to complete high-precision full-closed control; one path of the real position read by the grating ruler reading head is fed back to the shaft controller, the shaft controller performs proportion, differential and integral calculation according to the read real position and an interpolation value calculated by a 20MA numerical control system, real-time correction of the detected real position is equal to a program position, and one path of closed-loop detection and control is performed; and the other path of the real-time correction is fed back to an axis controller according to the actual position read by the grating ruler reading head, the axis controller performs proportion, differential and integral calculation according to the read actual position and an interpolation value calculated by a 20MA numerical control system, the detected actual position is corrected in real time to be equal to a program position, and closed-loop detection and control are performed on the other path of the real-time correction.
Furthermore, the processing voltage is high-power pulse current of 50-400 nanoseconds, distortion-free signal detection is carried out, and signals are extracted by using feedthrough inductance filtering and a coaxial line.
Further, the system calculates the discharge efficiency according to the discharge data, compares the actual average voltage of the machining state with a set reference voltage, judges whether the discharge state is open circuit, short circuit and normal machining discharge in a short time of 200 nanoseconds, proportionally controls the machining cutting speed in real time, controls the discharge voltage to be zero if the discharge voltage is less than 25 volts and the cutting speed of 15 volts but does not turn off a pulse power supply to maintain continuous machining in speed control, and only stops the discharge interruption machining if the short circuit time is more than 30 milliseconds and the speed is more than 30 milliseconds.
And further, the other path controls the machining position to be compared and calculated with the 20MA numerical control system program position according to the extracted lower computer speed data, judges the actual data with lagging position, performs linear or circular interpolation calculation, sends interpolation values to a corresponding X or Y axis controller, and the axis controller controls the linear motor to move according to the data given by the 20MA numerical control system.
Furthermore, the linear motor is installed on a movable supporting plate of the machine tool, the actual position of the linear motor is the moving position of the supporting plate of the machine tool, the moving distance of the supporting plate of the machine tool is read through a grating ruler installed on a fixed block of the machine tool and a grating ruler sliding ruler reading head installed on the movable supporting plate of the machine tool, and a double-closed-loop detection and control mode is used for controlling the moving distance.
Furthermore, the path of the real position read by the grating ruler reading head is fed back to the axis controller, the axis controller performs proportion, differentiation and integral calculation according to the read real position and an interpolation value calculated by a 20MA numerical control system, the real position detected by real-time correction is equal to a program position, and closed-loop detection and control are performed.
Furthermore, the actual position read by the grating ruler reading head is fed back to a numerical control system for control, the numerical control system calculates the deviation of the position and the lag time calculation axis correction control driver according to the comparison of the read actual position and the position of the 20MA numerical control system, and the position precision is controlled in real time by a second closed loop.
Furthermore, the reading of the actual position uses an import hair grid 0.00005MM high-precision grating ruler and a high-speed high-precision axis controller.
The invention has the beneficial effects that: the system modifies the waveform and pulse proportion of the pulse in real time according to the priority of the processing state, automatically controls the pulse power, enables the processing to be efficient and stable, and can completely eliminate all errors from the system control to the transmission by using the full closed-loop control of the magnetic suspension linear motor, and the control precision can reach the design precision of 0.0001 MM.
Detailed Description
An intelligent slow-moving-wire magnetic suspension high-precision size control method comprises the following steps:
the method comprises the following steps: the system detects the machining discharge voltage between the workpiece and the tool, and the machining discharge state voltage between the workpiece and the tool reduces the peak value 240V voltage of the machining discharge to 5V voltage without distortion through sampling and voltage reduction;
step two: one path of signal judges whether the current of each discharge pulse is 'open circuit', 'bias short circuit', 'short circuit' or 'normal processing discharge' according to the discharge time width of the AD790 high-speed integrated circuit inspection pulse, and the other path of signal is sent to an STC60S2 computer to carry out A/D12 bit analog-digital conversion;
step three: the AD digital signal is sent to a control system, a computer calculates the discharge state of the machining voltage according to real-time detection data, calculates the machining speed according to a fuzzy control model, and transmits the calculated speed data to an upper 20MA numerical control system at a high speed through an 8-bit data interface;
step four: controlling a position control driver according to a calculation result, and controlling the numerical control system in two ways according to data, wherein one way of control is used for calculating the discharge efficiency according to the discharge data, and the other way of control is used for extracting the speed data of a lower computer;
step five: controlling the linear motor to move;
step six: the grating ruler detects the actual moving distance and feeds the actual moving distance back to the system to calculate the actual moving error so as to complete high-precision full-closed control; one path of the real position read by the grating ruler reading head is fed back to the shaft controller, the shaft controller performs proportion, differential and integral calculation according to the read real position and an interpolation value calculated by a 20MA numerical control system, real-time correction of the detected real position is equal to a program position, and one path of closed-loop detection and control is performed; and the other path of the real-time correction is fed back to an axis controller according to the actual position read by the grating ruler reading head, the axis controller performs proportion, differential and integral calculation according to the read actual position and an interpolation value calculated by a 20MA numerical control system, the detected actual position is corrected in real time to be equal to a program position, and closed-loop detection and control are performed on the other path of the real-time correction.
Furthermore, the processing voltage is high-power pulse current of 50-400 nanoseconds, distortion-free signal detection is carried out, and signals are extracted by using feedthrough inductance filtering and a coaxial line.
Further, the system calculates the discharge efficiency according to the discharge data, compares the actual average voltage of the machining state with a set reference voltage, judges whether the discharge state is open circuit, short circuit and normal machining discharge in a short time of 200 nanoseconds, proportionally controls the machining cutting speed in real time, controls the discharge voltage to be zero if the discharge voltage is less than 25 volts and the cutting speed of 15 volts but does not turn off a pulse power supply to maintain continuous machining in speed control, and only stops the discharge interruption machining if the short circuit time is more than 30 milliseconds and the speed is more than 30 milliseconds.
And further, the other path controls the machining position to be compared and calculated with the 20MA numerical control system program position according to the extracted lower computer speed data, judges the actual data with lagging position, performs linear or circular interpolation calculation, sends interpolation values to a corresponding X or Y axis controller, and the axis controller controls the linear motor to move according to the data given by the 20MA numerical control system.
Furthermore, the linear motor is installed on a movable supporting plate of the machine tool, the actual position of the linear motor is the moving position of the supporting plate of the machine tool, the moving distance of the supporting plate of the machine tool is read through a grating ruler installed on a fixed block of the machine tool and a grating ruler sliding ruler reading head installed on the movable supporting plate of the machine tool, and a double-closed-loop detection and control mode is used for controlling the moving distance.
Furthermore, the path of the real position read by the grating ruler reading head is fed back to the axis controller, the axis controller performs proportion, differentiation and integral calculation according to the read real position and an interpolation value calculated by a 20MA numerical control system, the real position detected by real-time correction is equal to a program position, and closed-loop detection and control are performed.
Furthermore, the actual position read by the grating ruler reading head is fed back to a numerical control system for control, the numerical control system calculates the deviation of the position and the lag time calculation axis correction control driver according to the comparison of the read actual position and the position of the 20MA numerical control system, and the position precision is controlled in real time by a second closed loop.
Furthermore, the reading of the actual position uses an import hair grid 0.00005MM high-precision grating ruler and a high-speed high-precision axis controller, and the control precision reaches the design precision of 0.0001 MM.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. An intelligent slow-moving-wire magnetic suspension high-precision size control method is characterized by comprising the following steps:
the method comprises the following steps: the system detects the machining discharge voltage between the workpiece and the tool, and the machining discharge state voltage between the workpiece and the tool reduces the peak value 240V voltage of the machining discharge to 5V voltage without distortion through sampling and voltage reduction;
step two: one path of signal judges whether the current of each discharge pulse is 'open circuit', 'bias short circuit', 'short circuit' or 'normal processing discharge' according to the discharge time width of the AD790 high-speed integrated circuit inspection pulse, and the other path of signal is sent to an STC60S2 computer to carry out A/D12 bit analog-digital conversion;
step three: the AD digital signal is sent to a control system, a computer calculates the discharge state of the machining voltage according to real-time detection data, calculates the machining speed according to a fuzzy control model, and transmits the calculated speed data to an upper 20MA numerical control system at a high speed through an 8-bit data interface;
step four: controlling a position control driver according to a calculation result, and controlling the numerical control system in two ways according to data, wherein one way of control is used for calculating the discharge efficiency according to the discharge data, and the other way of control is used for extracting the speed data of a lower computer;
step five: controlling the linear motor to move;
step six: the grating ruler detects the actual moving distance and feeds the actual moving distance back to the system to calculate the actual moving error so as to complete high-precision full-closed control; one path of the real position read by the grating ruler reading head is fed back to the shaft controller, the shaft controller performs proportion, differential and integral calculation according to the read real position and an interpolation value calculated by a 20MA numerical control system, real-time correction of the detected real position is equal to a program position, and one path of closed-loop detection and control is performed; and the other path of the real-time correction is fed back to an axis controller according to the actual position read by the grating ruler reading head, the axis controller performs proportion, differential and integral calculation according to the read actual position and an interpolation value calculated by a 20MA numerical control system, the detected actual position is corrected in real time to be equal to a program position, and closed-loop detection and control are performed on the other path of the real-time correction.
2. The method for controlling the high-precision size of the intelligent slow-moving-wire magnetic suspension system as claimed in claim 1, wherein the processing voltage is high-power pulse current of 50-400 nanoseconds, distortion-free signal detection, and signals are extracted by using feedthrough inductance filtering and a coaxial line.
3. The method as claimed in claim 1, wherein the path calculates the discharge efficiency based on the discharge data, the system compares the actual average voltage of the machining state with a set reference voltage, determines whether the discharge state is open, short, and normal machining discharge in 200 ns short time, proportionally controls the machining cutting speed in real time, controls the discharge voltage to be zero with the cutting speed of 15 v if the discharge voltage is less than 25 v during speed control, but does not turn off the pulse power supply to maintain continuous machining, and stops the machining by stopping the discharge only when the short-circuit time reaches more than 30 ms and the speed is more than 30 ms.
4. The intelligent slow-moving-wire magnetic suspension high-precision size control method as claimed in claim 1, wherein the other path controls the machining position to compare with the 20MA numerical control system program position according to the extracted lower computer speed data, judges the actual data of position lag, performs linear or circular interpolation calculation, sends the interpolation value to the corresponding X or Y axis controller, and the axis controller controls the linear motor to move according to the data given by the 20MA numerical control system.
5. The intelligent slow-moving-wire magnetic suspension high-precision dimension control method as claimed in claim 1, wherein the linear motor is mounted on a moving pallet of a machine tool, the actual position of the linear motor is the moving position of the pallet of the machine tool, the moving distance of the pallet of the machine tool is read by a grating ruler mounted on a fixed block of the machine tool and a grating ruler slider reading head mounted on the moving pallet of the machine tool, and the control of the moving distance uses a double closed loop detection and control mode.
6. The method as claimed in claims 1 and 5, wherein the path is fed back to the axis controller according to the actual position read by the grating ruler reading head, the axis controller performs proportional, differential and integral calculations according to the actual position read and the interpolation value calculated by the 20MA numerical control system, corrects the detected actual position in real time to be equal to the programmed position, and performs a path of closed loop detection and control.
7. The intelligent slow-moving-wire magnetic suspension high-precision size control method as claimed in claims 1 and 5, wherein one path is fed back to a numerical control system according to the actual position read by a grating ruler reading head, the numerical control system calculates the deviation of the position and the lag time calculation axis-trimming control driver according to the comparison of the read actual position and the position of a 20MA numerical control system, and the position precision is controlled in real time by a second closed loop.
8. The intelligent slow-moving-wire magnetic suspension high-precision dimension control method as claimed in claim 1, wherein the reading of the actual position uses an import hair grid 0.00005MM high-precision grating ruler and a high-speed high-precision axis controller.
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Citations (7)
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|---|---|---|---|---|
| JPH0457619A (en) * | 1990-06-27 | 1992-02-25 | I N R Kenkyusho:Kk | Discharge gap control device |
| CN101362235A (en) * | 2008-09-12 | 2009-02-11 | 大连理工大学 | Electric spark micro hole processing control method |
| CN101653847A (en) * | 2009-09-15 | 2010-02-24 | 天津大学 | Method and system for machining micro-nano hole by electron discharge |
| CN203265816U (en) * | 2013-01-15 | 2013-11-06 | 洛阳信成精密机械有限公司 | EDM (Electric Discharge Machining) feeding automatic control system of electric spark machine |
| CN108043884A (en) * | 2017-12-25 | 2018-05-18 | 青岛理工大学 | One kind is based on the major-minor two close cycles deviation correction control systems of PID |
| CN208304083U (en) * | 2018-05-18 | 2019-01-01 | 桂林航天工业学院 | A kind of intelligence control system of electric discharge machine |
| CN109702280A (en) * | 2019-03-01 | 2019-05-03 | 南京工程学院 | A kind of control system of small-sized electric discharge machining apparatus |
-
2020
- 2020-05-11 CN CN202010392497.1A patent/CN111468795A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0457619A (en) * | 1990-06-27 | 1992-02-25 | I N R Kenkyusho:Kk | Discharge gap control device |
| CN101362235A (en) * | 2008-09-12 | 2009-02-11 | 大连理工大学 | Electric spark micro hole processing control method |
| CN101653847A (en) * | 2009-09-15 | 2010-02-24 | 天津大学 | Method and system for machining micro-nano hole by electron discharge |
| CN203265816U (en) * | 2013-01-15 | 2013-11-06 | 洛阳信成精密机械有限公司 | EDM (Electric Discharge Machining) feeding automatic control system of electric spark machine |
| CN108043884A (en) * | 2017-12-25 | 2018-05-18 | 青岛理工大学 | One kind is based on the major-minor two close cycles deviation correction control systems of PID |
| CN208304083U (en) * | 2018-05-18 | 2019-01-01 | 桂林航天工业学院 | A kind of intelligence control system of electric discharge machine |
| CN109702280A (en) * | 2019-03-01 | 2019-05-03 | 南京工程学院 | A kind of control system of small-sized electric discharge machining apparatus |
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