CN102218574A - Device and method for measuring and compensating deflection of machined position of linear cutter - Google Patents
Device and method for measuring and compensating deflection of machined position of linear cutter Download PDFInfo
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- CN102218574A CN102218574A CN2010101554016A CN201010155401A CN102218574A CN 102218574 A CN102218574 A CN 102218574A CN 2010101554016 A CN2010101554016 A CN 2010101554016A CN 201010155401 A CN201010155401 A CN 201010155401A CN 102218574 A CN102218574 A CN 102218574A
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Abstract
The invention discloses a device and method for measuring and compensating deflection of a machined position of a linear cutter. The device mainly comprises a vision sensing unit, a digital processing unit, a compensation adjusting unit and a machining control unit. The method comprises the following steps of: measuring images of discharge sparks generated by a workpiece to be machined, at different preset height positions at different time by utilizing the vision sensing unit, and obtaining linear deflections of the different preset height positions by processing a relationship between a time difference of firstly appearing discharge sparks of the different preset height positions and the movement speed of the linear cutter, wherein the linear deflections can be taken as references for adjusting machining parameters during linear deflection compensation. The method disclosed by the invention can be realized due to the device disclosed by the invention; through the device and method for measuring and compensating deflection of the machining position of the linear cutter, disclosed by the invention, machining track errors caused by the deflection of the linear cutter can be adjusted and modified, and the purpose of improving correctness of machining precision can be achieved.
Description
Technical field
The present invention relates to a kind of device and method that the Working position deflection with linear cutter process equipment is measured and compensates of being used for, especially a kind of device and method that is applicable to that the Working position deflection to wire electrode in the wire-cut electric discharge machine measures and compensates.
Background technology
Linear cutter in the wire-cut electric discharge machine is that two groups of cable guiding devices are run about being arranged in as wire electrode, and the cutting of in the environment that is full of the dielectric resistance working fluid, discharging, in theory, when the straight line working motion is carried out, line electrode should keep the form that moves both vertically in two groups of cable guiding devices, but line electrode is diameter 0.2～0.4mm rubber-like metal wire, the phenomenon of line deflection very easily takes place in process, and the maximum deviation amount that measures in cable guiding device and line deformation position is exactly the line deflection.
Notification number a kind of machined parameters automatic adjusting method and device of wire-cut electric discharge machine that be 330872 Taiwan patent disclosure, disclosed and only adjusted automatically, do not included linear cutter line deflection brake at the machined parameters of wire-cut electric discharge machine.
Notification number a kind of wire cutting machine line deflection method for measurement that has been 379152 Taiwan patent disclosure, from the technology contents that is disclosed as can be known, machining path at corner or circular arc place, with line deflection margin of error brake built-in in the line cutter controller, after machining, with the limit detecting voltage of seeking on the machine finished path is detected, be short-circuited if cause workpiece to contact with the line utmost point in the wired bending phenomenon of corner and arc position place, then change offset, continue to do the path detecting, till measuring the offset that does not just have short circuit, get final product the line deflection at this corner or circular arc place, set up the machined parameters data of machine itself, add in the future and compensate automatically man-hour.This method is to do earlier to seek the gap width that wing directly finds discharge, again the discharging gap value is deducted with original program track in finished path, do the empty motion of running as new path, be recorded in the position that each corner and short-circuit curve path are short-circuited, change different offsets again, different corners and short-circuit curve path are done empty the race, whether be recorded in each corner is short-circuited, so repeatedly revising offset carries out after sky run to measure, could be with short circuit for just removing or the position of short-circuit conditions when just taking place, find the offset of respectively organizing the corner angle, offset can be calculated the line deflection of this angle position thus.By above-mentioned method for measurement as can be known, need the cost plenty of time to do machining path and repeatedly empty race experiment in advance, can waste many workpiece to be machined materials, especially corner and the circular arc path at different angles must repeat repeatedly experimental measurement.
And for example the detection lines electrode movement state that is disclosed in United States Patent (USP) the 6707304th B2 number is to measure the method and apparatus of linear electrode in the variation of the working fluid middle impedance that flows in the noncontact mode, with the motion of line electrode during monitoring is processed fully.
No. the 4673787th, United States Patent (USP) for another example, with multitool time process steps, improves because of being subjected to factors such as line deflection to cause the machining locus error, makes machining locus be adapted to the machining path shape of hope gradually.
Summary of the invention
In order to address the above problem, the invention provides a kind of device and method that deflection measures and compensates to linear cutter Working position, this device and method is the deflection deformation amount with visual quantities survey line shape cutter, and then adjust the compensation machined parameters, to reach the purpose that improves the machining accuracy correctness.
The present invention for the technical scheme that solves its technical problem and adopt is:
A kind of device that deflection measures and compensates to linear cutter Working position mainly comprises:
One visual impression measurement unit, this visual unit are used to write down the discharge spark image that workpiece to be machined is produced at different desired height position and different time;
One digital processing element, this is used to handle computing and manifests the time difference of discharge spark and the relation of linear cutter translational speed for the first time in described different desired height position, and then can produce the line deflection of different desired height position;
One compensation adjustment unit, this compensation adjustment unit as the foundation of adjusting machined parameters, and select different compensation adjustment modes to revise machined parameters according to different machining paths with described line deflection, and then produce revised machined parameters;
One machining control unit, this machining control unit is with the actual working motion of described revised machined parameters control with the toolroom machine of discharge form processing;
Described visual impression measurement unit passes to described digital processing element with the described image that it captures, described digital processing element passes to described compensation adjustment unit with the described line deflection that its processing computing obtains, described compensation adjustment unit passes to described machining control unit with the described revised machined parameters of its generation, to reach the purpose that improves the machining accuracy correctness.
A kind of method that deflection measures to linear cutter Working position, because linear cutter is opened and being made when cutting of discharging entering the workpiece to be machined region of discharge, the height that produces the discharge spark position is also inequality, so can use a visual impression measurement unit to measure the discharge spark image that workpiece to be machined is produced at different desired height position and different time, the time difference by manifesting discharge spark the first time of handling described different desired height position and the relation of linear cutter translational speed, and then draw the line deflection of different desired height position, can produce the curve map of line deflection according to the line deflection of different desired height position, adjust the foundation of machined parameters when promptly can be used as the line deflection-compensated.In the process of online cutting discharge processing, the different compensation adjustment mode of must arranging in pairs or groups because of machining path is different when machining locus is rectilinear motion, then must be selected straight line compensation adjustment mode; When machining locus is circular arc, then must select circular arc compensation adjustment mode; When machining locus is corner, then must select corner compensation adjustment mode.Finish the data that revised machined parameters can be provided as the actual processing of wire-cut electric discharge machine.
The invention has the beneficial effects as follows: method of the present invention is to use a visual impression measurement unit to measure the discharge spark image that workpiece to be machined is produced at different desired height position and different time, the time difference by manifesting discharge spark the first time of handling described different desired height position and the relation of linear cutter translational speed, and then draw the line deflection of different desired height position, adjust the foundation of machined parameters when promptly can be used as the line deflection-compensated, in the process of online cutting discharge processing, because of the different compensation adjustment mode of the different necessary collocation of machining path, finish the data that revised machined parameters can be provided as the actual processing of wire-cut electric discharge machine, device of the present invention makes method of the present invention to be achieved, the device and method that deflection measures and compensates to linear cutter Working position of the present invention can be adjusted the machining locus error that the linear cutter deflection of modifying factor is caused, to reach the purpose of the correctness that improves machining accuracy.
Description of drawings
Fig. 1 is the device schematic diagram that deflection measures and compensates to linear cutter Working position of the present invention;
Fig. 2 is the location diagram between digitizing video device of the present invention, line electrode and workpiece to be machined;
Fig. 3 moves the deflection schematic diagram for line electrode of the present invention;
Fig. 4 is the program flow diagram of digital processing element of the present invention;
Fig. 5 is the different desired height position line of the present invention deflection curve map;
Fig. 6 is the program flow diagram of compensation adjustment of the present invention unit.
The specific embodiment
Embodiment: as shown in Figure 1, the device that deflection measures and compensates to linear cutter Working position of the present invention, mainly comprise: a visual impression measurement unit A, this visual unit is used to write down the discharge spark image that workpiece to be machined is produced at different desired height position and different time; One digital processing element B, this is used to handle computing and manifests the time difference of discharge spark and the relation of linear cutter translational speed for the first time in described different desired height position, and then can produce the line deflection of different desired height position; One compensation adjustment unit C, this compensation adjustment unit as the foundation of adjusting machined parameters, and selects different compensation adjustment modes to revise machined parameters according to different machining paths with described line deflection, and then produces revised machined parameters; One machining control cells D, this machining control unit is with the actual working motion of described revised machined parameters control with the toolroom machine of discharge form processing; Described visual impression measurement unit passes to described digital processing element with the described image that it captures, described digital processing element passes to described compensation adjustment unit with the described line deflection that its processing computing obtains, described compensation adjustment unit passes to described machining control unit with the described revised machined parameters of its generation, so can adjust the machining locus error that the deflection of modifying factor line electrode is caused, and then improve the correctness of wire-cut electric discharge machine machining accuracy.
As shown in Figure 2, the digital recording apparatus 1 of this visual impression measurement unit A is placed in a fixed position, and the discharge spark image when being used for call wire electrode 3 near workpiece to be machined produces numerical data; Two groups of cable guiding devices are upper conductor device 21, and lower wire device 22; And the line electrode 3 of a fine rule shape of running continuously upper conductor device 21, and 22 clampings of lower wire device in run, and to advance mobile perpendicular to the mode level of workpiece to be machined 4 horizontal planes, when line electrode 3 marches to when entering gap discharge regional near workpiece to be machined 4, promptly begin to produce the phenomenon of discharge spark, the line bending phenomenon is also followed generation.
As shown in Figure 3, when line electrode 3 marched to position a, digitizing video device 1 was not mended the digitized video of grasping any discharge spark as yet; When line electrode 3 marched to position b, the high relatively relative low end positions with the top in workpiece to be machined 4 bottoms was mended the digitized video of grasping the beginning discharge spark by digitizing video device 1 respectively; When line electrode 3 marches to position c, the relative higher relative lower end of an end in workpiece to be machined 4 bottoms respectively with the top, the discharge spark image that has a few mm length is respectively grasped by digitizing video device 1 benefit.Because electric discharge phenomena will occur in the front end and the side of line electrode 3, the time of discharge can be counted when discharge spark takes place in the first time.When arriving a kind of state of stable cutting discharge, measure the intermediate point of the end points of workpiece to be machined 4 sides to workpiece to be machined 4 sides, can get the discharge spark position by the mobile gradually intermediate point that extends to of the two-end-point of workpiece to be machined 4 sides.
As shown in Figure 4, program flow diagram for digital processing element B, the first handling procedure B1 can handle several image digital data that digitizing video device 1 produces in the unit interval, the different desired height position that the second handling procedure B2 detects workpiece to be machined manifest the time difference of discharge spark and the relation of the linear cutter translational speed of the 3rd handling procedure B3 for the first time, can manage program B4 calculation process everywhere the and produce line deflection corresponding to different desired height position, the line deflection that stores different desired height position at the 5th handling procedure B5 is to offer compensation adjustment unit C.
The line deflection can be defined as: Δ S=Δ t * f
Wherein, Δ S represents the line deflection; F represents cutting speed mm/min (being linear cutter translational speed); On behalf of different desired height position, Δ t manifest the time difference of discharge spark for the first time;
When following embodiment situation:
Workpiece to be machined thickness=50mm, material SKD11, ∮ 0.25mm copper cash electrode;
The machined parameters of wire-cut electric discharge machine:
Start voltage=90V;
Discharge=14 (0.7us);
Outage=9 (9us);
Electric arc begins=9 (0.45us);
Arc ending=8 (8us);
Line tension=1200g;
Line line speed=10m/min;
Gap voltage=44V;
Feed rate=2.4mm/min;
Because processing workpiece to be machined thickness is 50mm, the cutting speed of copper cash electrode is fixed as 2.4mm/min, and the digitizing video device produces 30 digital images one second, so the copper cash electrode displacement amount of every image representative is to equal:
(2.4mm/min)×(min/60sec)×(1sec/30F)＝1.333um/F
Just equal each image and representing the line deflection of 1.33um, so mode is calculated the different desired height position of workpiece to be machined thus, need discharge spark for the first time appear just now through several images respectively, can obtain the line deflection of the different desired height position of workpiece to be machined, produce data as table 1:
Table 1
| Position height (mm) | The image number | Line deflection (um) |
| 50 | 0 | 0 |
| 48 | 4 | 5 |
| 47 | 6 | 8 |
| 46 | 9 | 12 |
| 45 | 12 | 16 |
| 44 | 17 | 23 |
| 42 | 21 | 28 |
| 40 | 34 | 45 |
| 39 | 41 | 55 |
| 38 | 45 | 60 |
| 36 | 50 | 67 |
| 35 | 55 | 73 |
| 34 | 60 | 80 |
| 32 | 67 | 89 |
| 30 | 71 | 95 |
| 28 | 75 | 100 |
| 26 | 78 | 104 |
| 25 | 82 | 109 |
| 24 | 83 | 111 |
| 23 | 84 | 112 |
| 22 | 84 | 112 |
| 20 | 83 | 111 |
| 19 | 82 | 109 |
| 18 | 80 | 107 |
| 17 | 78 | 104 |
| 16 | 75 | 100 |
| 14 | 71 | 95 |
| 12 | 67 | 89 |
| 11 | 63 | 84 |
| 10 | 60 | 80 |
| 9 | 55 | 73 |
| 8 | 49 | 65 |
| 7 | 41 | 55 |
| 6 | 35 | 47 |
| 4 | 25 | 33 |
| 3 | 20 | 27 |
| 2 | 12 | 16 |
| 0 | 0 | 0 |
Multiple spot line deflection data in the different desired height position of record can produce line deflection curve map as shown in Figure 5, and transverse axis is represented the different desired height position of workpiece to be machined, the mm of unit among Fig. 5; The longitudinal axis is then represented the line deflection, the um of unit.
As shown in Figure 6, program flow diagram for compensation adjustment unit C, in the first subprogram C1 by the machined parameters such as the start voltage of former setting, discharge time, power-off time, the electric arc time started, the arc ending time, line tension, the line line speed, gap voltage, feed rate etc., add resulting line deflection through above-mentioned digital processing element B, enter the second subprogram C2 and select the machining path pattern, according to different machining path tracks, select different straight line patterns, circular arc mode or corner pattern, enter the compensation adjustment one of the 3rd subprogram C3 straight line pattern respectively, the compensation adjustment two of the 4th subprogram C4 circular arc mode, the compensation adjustment three of the 5th subprogram C5 corner pattern, after doing the compensation adjustment of means of different, enter the 6th subprogram C6 and produce revised machined parameters, enter the 7th subprogram C7 more revised machined parameters is offered the machining control cells D with the actual processing of control wire-cut electric discharge machine.Above-mentioned machining control cells D is the wire-cut electric discharge machine controller with regard to wire-cut electric discharge machine.
Present embodiment is a kind of preferred implementation of the present invention; for author content of the present invention further is described better; be not to be limitation of the present invention, any equivalence that those of ordinary skills do based on present embodiment is replaced or non-creativeness is revised and all fallen in the scope that claim of the present invention protects.
Claims (14)
1. device that deflection measures and compensates to linear cutter Working position is characterized in that: mainly comprise:
A visual impression measurement unit that is used to write down the discharge spark image that workpiece to be machined produced at different desired height position and different time;
One is used to handle computing and manifests the time difference of discharge spark and the relation of linear cutter translational speed for the first time in described different desired height position, and then can produce the digital processing element of the line deflection of different desired height position;
One with described line deflection as the foundation of adjusting machined parameters, and select different compensation adjustment modes to revise machined parameters, and then produce the compensation adjustment unit of revised machined parameters according to different machining paths;
One with the machining control unit of described revised machined parameters control with the actual working motion of the toolroom machine of discharge form processing;
Described visual impression measurement unit passes to described digital processing element with the described image that it captures, described digital processing element passes to described compensation adjustment unit with the described line deflection that its processing computing obtains, and described compensation adjustment unit passes to described machining control unit with the described revised machined parameters of its generation.
2. the device that deflection measures and compensates to linear cutter Working position according to claim 1 is characterized in that: described visual impression measurement unit is a digitizing video device.
3. the device that deflection measures and compensates to linear cutter Working position according to claim 1 is characterized in that: described linear cutter is a line electrode.
4. the device that deflection measures and compensates to linear cutter Working position according to claim 1 is characterized in that: described toolroom machine with the processing of discharge form is a wire-cut electric discharge machine.
5. the device that deflection measures and compensates to linear cutter Working position according to claim 4 is characterized in that: described machining control unit is the wire-cut electric discharge machine controller.
6. method that deflection measures to linear cutter Working position, it is characterized in that: measure the discharge spark image that workpiece to be machined is produced at different desired height position and different time with a visual impression measurement unit, manifest the time difference of discharge spark and the relation of linear cutter translational speed for the first time by handling described different desired height position, and then draw the line deflection of different desired height position.
7. a kind of method that deflection measures to linear cutter Working position according to claim 6, it is characterized in that: also comprise a compensation method: with the foundation of described line deflection as the adjustment machined parameters, and select different compensation adjustment modes to revise machined parameters, and then produce revised machined parameters according to different machining paths.
8. a kind of method that deflection measures to linear cutter Working position according to claim 7 is characterized in that: described machining path is a kind of in straight line, circular arc and the corner machining path, and described compensation adjustment mode is selected according to machining path.
9. a kind of method that deflection measures to linear cutter Working position according to claim 6 is characterized in that: described linear cutter translational speed remains a fixed speed.
10. a kind of method that deflection measures to linear cutter Working position according to claim 9 is characterized in that: the line deflection of described different desired height position is that described linear cutter translational speed multiply by the time difference that described different desired height position manifests discharge spark for the first time.
11. a kind of method that deflection measures to linear cutter Working position according to claim 6, it is characterized in that: described visual impression measurement unit has a digitizing video device.
12. a kind of method that deflection measures to linear cutter Working position according to claim 11 is characterized in that: the time difference that described different desired height position manifest discharge spark is for the first time counted to get by the image number that described visual impression measurement unit is write down.
13. a kind of method that deflection measures to linear cutter Working position according to claim 12 is characterized in that: the displacement of the linear cutter of every described image representative is that described linear cutter translational speed multiply by the unit interval that every described image produces.
14. a kind of method that deflection measures to linear cutter Working position according to claim 13 is characterized in that: the line deflection of described different desired height position is that the displacement of the linear cutter of described every image representative multiply by the image number counting that described different desired height position manifests discharge spark for the first time.
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| CN 201010155401 CN102218574B (en) | 2010-04-16 | 2010-04-16 | Device and method for measuring and compensating deflection of machined position of linear cutter |
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| CN103331497A (en) * | 2013-06-25 | 2013-10-02 | 北京东兴润滑剂有限公司 | Method for recording dynamic distribution of discharge products in electrospark wire-electrode cutting narrow slit |
| CN104199381A (en) * | 2014-09-19 | 2014-12-10 | 深圳市英威腾电气股份有限公司 | Method and device for cutter compensation control of numerical control system |
| CN106112153A (en) * | 2016-07-26 | 2016-11-16 | 苏州科技大学 | Nc wire-cutting molybdenum filament vertical survey bearing calibration and device |
| CN106216786A (en) * | 2016-07-26 | 2016-12-14 | 苏州科技大学 | Nc wire-cutting molybdenum filament on-line measurement apparatus and method |
| CN107999910A (en) * | 2017-12-08 | 2018-05-08 | 广东工业大学 | A kind of control method of electric spark wire cutting machine and a kind of electric spark wire cutting machine |
| CN110988633A (en) * | 2019-12-20 | 2020-04-10 | 中南大学 | Multifunctional monitoring method for self-adaptive adjustment of wire cut electrical discharge machining process |
| CN112958862A (en) * | 2021-03-04 | 2021-06-15 | 中南大学 | Wire electrode track compensation method for electrospark wire-electrode cutting processing |
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| CN103331497B (en) * | 2013-06-25 | 2016-03-02 | 北京东兴润滑剂有限公司 | The method of discharging product DYNAMIC DISTRIBUTION in record Wire EDM narrow slit |
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| CN104199381A (en) * | 2014-09-19 | 2014-12-10 | 深圳市英威腾电气股份有限公司 | Method and device for cutter compensation control of numerical control system |
| CN106216786B (en) * | 2016-07-26 | 2018-05-22 | 苏州科技大学 | Nc wire-cutting molybdenum filament on-line measurement apparatus and method |
| CN106112153A (en) * | 2016-07-26 | 2016-11-16 | 苏州科技大学 | Nc wire-cutting molybdenum filament vertical survey bearing calibration and device |
| CN106216786A (en) * | 2016-07-26 | 2016-12-14 | 苏州科技大学 | Nc wire-cutting molybdenum filament on-line measurement apparatus and method |
| CN106112153B (en) * | 2016-07-26 | 2018-03-23 | 苏州科技大学 | Nc wire-cutting molybdenum filament vertical survey bearing calibration and device |
| CN107999910A (en) * | 2017-12-08 | 2018-05-08 | 广东工业大学 | A kind of control method of electric spark wire cutting machine and a kind of electric spark wire cutting machine |
| CN107999910B (en) * | 2017-12-08 | 2019-10-29 | 广东工业大学 | A kind of control method and a kind of electric spark wire cutting machine of electric spark wire cutting machine |
| CN110988633A (en) * | 2019-12-20 | 2020-04-10 | 中南大学 | Multifunctional monitoring method for self-adaptive adjustment of wire cut electrical discharge machining process |
| CN110988633B (en) * | 2019-12-20 | 2021-10-26 | 中南大学 | Multifunctional monitoring method for self-adaptive adjustment of wire cut electrical discharge machining process |
| CN112958862A (en) * | 2021-03-04 | 2021-06-15 | 中南大学 | Wire electrode track compensation method for electrospark wire-electrode cutting processing |
| CN115319932A (en) * | 2022-10-13 | 2022-11-11 | 沈阳和研科技有限公司 | Precision compensation method and system of double-shaft scribing machine |
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