CN204711353U - Be suitable for the electrode discharge position auto-feed control system of spark machined - Google Patents
Be suitable for the electrode discharge position auto-feed control system of spark machined Download PDFInfo
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- CN204711353U CN204711353U CN201520326400.1U CN201520326400U CN204711353U CN 204711353 U CN204711353 U CN 204711353U CN 201520326400 U CN201520326400 U CN 201520326400U CN 204711353 U CN204711353 U CN 204711353U
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Abstract
The utility model relates to a kind of electrode auto-feed control system being suitable for spark machined, comprise interconnective signal acquisition circuit and differential amplifier circuit, described signal acquisition circuit comprises the bleeder circuit be mutually in series by upper divider resistance R1 and lower bleeder circuit R2, the external connection end of described upper divider resistance R1 forms the signal discrepancy end of signal acquisition circuit, the external connection end of described lower divider resistance R2 forms the zero potential end of signal acquisition circuit, described lower divider resistance R2 is parallel with electric capacity of voltage regulation, the output of described lower divider resistance forms the signal output part of described signal acquisition circuit, by differential amplifier circuit, the signal of the voltage signal Ue obtained from signal acquisition circuit and set-point Sv is compared, controlled working process according to this.This control system can eliminate unnecessary high frequency mo, improves spark discharge effect, improves working (machining) efficiency, extends the service life of spark erosion equipment.
Description
Technical field
The utility model relates to a kind of electrode auto-feed control system being suitable for spark machined, is mainly used in spark erosion equipment.
Background technology
Spark machined is the material utilizing the galvanic action ablation electrically conductive workpiece surface produced during pulsed discharge between electrode and workpiece be immersed in working solution, form required shape gradually, electrode and workpiece connect the two poles of the earth of the pulse power respectively and immerse in working solution, moved by electrode auto feed system band moving electrode, the discharging gap of adaptation is formed between motor and workpiece, working solution punctures by the pulse voltage be applied on electrode and workpiece, produce spark discharge, instantaneous concentrated a large amount of heat energy in the micro-channel of electric discharge, temperature can up to more than 10,000 degrees Celsius, pressure also has and sharply changes, thus the metal material of this point working surface local trace is melted at once, gasification, and explosion type be splashed in working solution, rapid condensation, form the metal particle of solid, taken away by working solution, just next small pit vestige is stayed on the surface of the workpiece, to discharge of short duration resting, between two electrodes, working solution recovers state of insulation, and then next pulse voltage punctures at another place that two electrodes are relatively close again, produce spark discharge, repeat said process, although the amount of metal of each like this pulsed discharge ablation is few, but there is thousands of subpulse discharge process because of per second, the metal that just energy ablation is more, as long as change the shape of tool-electrode and the relative motion mode between tool-electrode and workpiece, just can process the profile of various complexity.In the process of ablation workpiece, need the amount of feeding being controlled motor by electrode auto-feed control system, make between electrode and workpiece, to remain rational discharging gap, under prior art, the discharging gap in other words electrode amount of feeding carries out controlling according to the real-time voltage between electrode and workpiece, the control circuit of its electrode auto feed system mainly comprises the voltage collection circuit (measurement links) connected successively, comparison circuit (comparing element) and amplification driving circuit, the signal (preset reference servo voltage signal Sv) of the signal Ue got from measurement links and " set-point " is compared and amplified, formation control signal, control feed servo motor (or other drive units) work, as Sv < Ue, then electrode is to lower feeding, as Sv > Ue, then electrode upwards rollback, with the discharging gap between control electrode and workpiece, to obtain good processing effect.The major defect of this electrode auto-feed control system is: measured always in change due to measurement links, causes performing link and to move too frequently adjustment, reduce the efficiency of discharge system; Amplify and drive the precision of link low, perform the stepper motor of link, feed accuracy is low, and response speed is slow.
Utility model content
In order to overcome the above-mentioned defect of prior art, the utility model provides the electrode auto-feed control system being suitable for spark machined, and this control system can eliminate unnecessary high frequency mo, improves spark discharge effect, improve working (machining) efficiency, extend the service life of process equipment.
The technical scheme that the utility model adopts: a kind of electrode auto-feed control system being suitable for spark machined, comprise signal acquisition circuit and differential amplifier circuit, the signal of described signal acquisition circuit exports the signal output of the described differential amplifier circuit of access, described signal acquisition circuit comprises the bleeder circuit be mutually in series by upper divider resistance R1 and lower bleeder circuit R2, the signal that the external connection end (one end be not connected with lower divider resistance R2) of described upper divider resistance R1 forms signal acquisition circuit is come in and gone out and is held, for connecting corresponding electrode, the external connection end (one end be not connected with upper divider resistance R1) of described lower divider resistance R2 forms the earth terminal (zero potential end) of signal acquisition circuit, for connecting workpiece, described lower divider resistance R2 is parallel with electric capacity of voltage regulation C, for filtering high-frequency signal (can need to determine the high frequency of answering filtering according to control), the output of described lower divider resistance forms the signal output part of described signal acquisition circuit, for connecting the signal input part of described differential amplifier circuit.
The beneficial effects of the utility model: owing to adopting bleeder circuit collection signal voltage, particularly due to electric capacity of voltage regulation arranged side by side on lower divider resistance, by unnecessary high-frequency signal filtering, obtain relative smooth and stable signal, avoid the frequent movement that executing agency is unnecessary, according to the experiment of applicant, through this level and smooth after, electric discharge quality can be improved significantly, improve duty, improve working (machining) efficiency, and be conducive to the service life of extension device; Owing to have employed differential amplifier circuit, be not only conducive to circuit reduction, but also the period statistical function to signal can be increased, by the statistics number in a period of time, as criterion, instead of single and judge, this further enhance the stability of system, avoid accidental misoperation.According to the experiment of applicant, under signal acquisition circuit of the present utility model and the preferred resistance capacitance value thereof of sampling, can make in the time scale of 1ms, the fluctuation ratio of sampled voltage is less than 10%, the stability of electric discharge processing can be significantly improved, improve ablation efficiency more than 5%, save process time.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model signal acquisition circuit.
Detailed description of the invention
See Fig. 1, the utility model relates to a kind of electrode auto-feed control system being suitable for spark machined, comprise signal acquisition circuit and differential amplifier circuit, the signal of described signal acquisition circuit exports the signal output of the described differential amplifier circuit of access, described signal acquisition circuit comprises the bleeder circuit be mutually in series by upper divider resistance R1 and lower bleeder circuit R2, the signal that the external connection end (one end be not connected with lower divider resistance R2) of described upper divider resistance R1 forms signal acquisition circuit is come in and gone out and is held, for connecting corresponding electrode, the external connection end (one end be not connected with upper divider resistance R1) of described lower divider resistance R2 forms the earth terminal (zero potential end) of signal acquisition circuit, for connecting workpiece, described lower divider resistance R2 is parallel with electric capacity of voltage regulation C, for filtering high-frequency signal (can need to determine the so-called high frequency of answering filtering according to control), the output of described lower divider resistance forms the signal output part of described signal acquisition circuit, for connecting the signal input part of described differential amplifier circuit.Pass through differential amplifier circuit, the signal (such as preset reference servo voltage signal) of the voltage signal Ue obtained from signal acquisition circuit and " set-point Sv " is compared, carry out controlled working process by this difference again, as Sv < Ue, then electrode is to lower feeding; As Sv > Ue, then electrode upwards rollback.
The resistance value of described upper divider resistance R1 is preferably 10K, and the resistance value of described lower divider resistance R2 is preferably 1K, to obtain the sampled signal of suitable size.
Described lower divider resistance is preferably adjustable resistance, so that debugging also regulates according to actual needs, optimizes signals collecting.
The capacitance of described electric capacity of voltage regulation is preferably 104uF(microfarad), according to applicant's experiment, adopt this electric capacity can improve spark discharge effect significantly.
Described differential amplifier circuit preferably adopts UA747 chip.
Preferably sampling hold circuit is provided with between described signal acquisition circuit and differential amplifier circuit, so that sampling and signal transacting, the signal output part of described signal acquisition circuit connects the signal input part of described sampling hold circuit, and the signal output part of described sampling hold circuit connects the input of described differential amplifier circuit.
Described sampling hold circuit preferably adopts HA-2425 chip.
Preferably be provided with single-chip microcomputer after described differential amplifier circuit, described single-chip microcomputer preferably adopts 89C52-PLCC single-chip microcomputer.
Described differential amplifier circuit be preferably provided with analog to digital conversion circuit with described single-chip microcomputer, so that follow-up data processing.
Analog-digital conversion circuit as described preferably adopts AD673 chip.
Preferably latch is provided with, the preferred 74HC573 chip of described latch between analog-digital conversion circuit as described and described single-chip microcomputer.
The control signal of described single-chip microcomputer exports preferably access servomotor motion control circuit, the AC servo motor of control signal access for driving the movement of described electrode Z-direction (vertical direction) of described servomotor motion control circuit, thus control electrode do required moving up and down along Z-direction.
Each optimization technique means disclosed in the utility model, unless otherwise indicated and optimization technique means be outside the further restriction of another technological means, all can be combined, form some different technical schemes.
Claims (10)
1. one kind is suitable for the electrode auto-feed control system of spark machined, it is characterized in that comprising signal acquisition circuit and differential amplifier circuit, the signal of described signal acquisition circuit exports the signal output of the described differential amplifier circuit of access, described signal acquisition circuit comprises the bleeder circuit be mutually in series by upper divider resistance R1 and lower bleeder circuit R2, the external connection end of described upper divider resistance R1 forms the signal discrepancy end of signal acquisition circuit, the external connection end of described lower divider resistance R2 forms the zero potential end of signal acquisition circuit, described lower divider resistance R2 is parallel with electric capacity of voltage regulation C, the output of described lower divider resistance forms the signal output part of described signal acquisition circuit, for connecting the signal input part of described differential amplifier circuit.
2. control system as claimed in claim 1, it is characterized in that the resistance value of described upper divider resistance R1 is 10K, the resistance value of described lower divider resistance R2 is 1K.
3. control system as claimed in claim 2, is characterized in that described lower divider resistance is preferably adjustable resistance.
4. control system as claimed in claim 3, is characterized in that the capacitance of described electric capacity of voltage regulation is 104uF.
5. control system as claimed in claim 4, is characterized in that described differential amplifier circuit preferably adopts UA747 chip.
6. the control system as described in claim 1,2,3 or 4, is characterized in that being provided with sampling hold circuit between described signal acquisition circuit and differential amplifier circuit.
7. control system as claimed in claim 6, what it is characterized in that described differential amplifier circuit is provided with single-chip microcomputer below.
8. control system as claimed in claim 7, is characterized in that described single-chip microcomputer adopts 89C52-PLCC single-chip microcomputer.
9. control system as claimed in claim 8, what it is characterized in that described differential amplifier circuit is preferably provided with analog to digital conversion circuit with described single-chip microcomputer, is preferably provided with latch between analog-digital conversion circuit as described and described single-chip microcomputer.
10. control system as claimed in claim 9, it is characterized in that the control signal of described single-chip microcomputer exports access servomotor motion control circuit, the AC servo motor of control signal access for driving the movement of described electrode Z-direction of described servomotor motion control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520326400.1U CN204711353U (en) | 2015-05-20 | 2015-05-20 | Be suitable for the electrode discharge position auto-feed control system of spark machined |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520326400.1U CN204711353U (en) | 2015-05-20 | 2015-05-20 | Be suitable for the electrode discharge position auto-feed control system of spark machined |
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| CN204711353U true CN204711353U (en) | 2015-10-21 |
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| CN201520326400.1U Expired - Fee Related CN204711353U (en) | 2015-05-20 | 2015-05-20 | Be suitable for the electrode discharge position auto-feed control system of spark machined |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107283009A (en) * | 2017-08-24 | 2017-10-24 | 江苏冬庆数控机床有限公司 | The control system and processing method of a kind of electrical discharge machining |
-
2015
- 2015-05-20 CN CN201520326400.1U patent/CN204711353U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107283009A (en) * | 2017-08-24 | 2017-10-24 | 江苏冬庆数控机床有限公司 | The control system and processing method of a kind of electrical discharge machining |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160304 Address after: 223300 No. 118, Songjiang Road, Huaiyin Economic Development Zone, Huaian, Jiangsu Patentee after: Derica (Beijing) CNC Equipment Co., Ltd. Address before: 101300 Beijing City, Ma Yun town, temple village, east of the volume of 200 meters Patentee before: Dyga (Beijing) CNC equipment Limited by Share Ltd |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151021 Termination date: 20210520 |