CN108746892B - Composite pulse electric spark machining spray explosion power supply, system and method - Google Patents
Composite pulse electric spark machining spray explosion power supply, system and method Download PDFInfo
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- CN108746892B CN108746892B CN201810909681.1A CN201810909681A CN108746892B CN 108746892 B CN108746892 B CN 108746892B CN 201810909681 A CN201810909681 A CN 201810909681A CN 108746892 B CN108746892 B CN 108746892B
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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
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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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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention provides a composite pulse electric spark machining explosion power supply, a system and a method, wherein the power supply comprises a waveform generating circuit, a comparison circuit, an amplifying circuit and a power switch circuit which are connected in sequence; the waveform generation circuit generates a secondary step wave original pulse, and the comparison circuit adopts a comparison voltage of which one is high and the other is low and the two paths of different thresholds are respectively compared with the pulse signals to form two paths of square wave pulse signals with the same phase, the same period and the proportional relation of duty ratio; the two paths of square wave signals are processed by the amplifying circuit and then respectively control the on and off of the high-voltage switching tube and the low-voltage switching tube, so that a secondary step wave is generated; the front stage in the second-stage ladder wave is a breakdown pulse, and plays a role in breakdown and corrosion on a discharge gap; the latter stage is to provide an explosive force pulse. The technical scheme of the invention solves the problems of low energy efficiency and poor explosion effect in the prior art.
Description
Technical Field
The invention relates to an electric spark power supply, in particular to a composite pulse electric spark machining explosion power supply, a system and a method.
Background
Currently, spark discharge is commonly used in the field of electrical discharge machining to remove metal to effect shape machining of metallic materials. The process method makes up for the defects of complex processing equipment and poor flexibility in the field of mechanical processing, and is widely popularized in the mould industry, the national defense industry and the fine manufacturing industry. The electric spark power supply is used as an important component in an electric spark machining system, pulse energy required in the machining process is provided through spark discharge, and the performance of the electric spark power supply has great influence on indexes such as electric spark machining precision, production efficiency, tool electrode loss, electric energy utilization rate and the like. However, the existing electric spark processing system has the technical problems of low energy efficiency ratio, difficult discharge of electric corrosion products and the like in application, and particularly the electric spark power supply has serious energy dissipation.
Disclosure of Invention
According to the technical problem that the energy efficiency ratio of the existing spark power supply is low, the composite pulse electric spark machining explosion power supply is provided. The invention mainly utilizes the secondary step wave type processing pulse, thereby realizing the maximization of the energy utilization rate and the optimization of the blasting effect by utilizing reasonable electric parameters.
The invention adopts the following technical means:
a composite pulse electric spark machining explosion power supply is characterized by comprising a waveform generation circuit, a comparison circuit, an amplifying circuit and a power switch circuit which are connected in sequence;
the waveform generation circuit generates a secondary step wave original pulse and sends the original pulse signal to the comparison circuit; the comparison circuit is in the shape of comparing a high-low comparison voltage with two paths of different thresholds with the pulse signals respectively to form two paths of square wave pulse signals with the same phase, the same period and the proportional relation of duty ratio; the two paths of square wave signals are processed by the amplifying circuit and then respectively control the on and off of the high-voltage switching tube and the low-voltage switching tube, so that a secondary step wave is generated; the front stage in the second-stage ladder wave is a breakdown pulse, and plays a role in breakdown and corrosion on a discharge gap; the latter stage is to provide an explosive force pulse.
Further, the power switch circuit comprises two paths of power switch tubes for conducting and switching-off control on a power supply.
The invention also provides a composite pulse electric spark machining system which is characterized by comprising a workpiece system and the power supply device.
Further, the workpiece system comprises a clamp for clamping and immersing the workpiece in the working liquid tank filled with the working liquid; the working electrode is arranged above the workpiece and fixedly connected with the electric spark machine head; an electric spark power supply box which is respectively connected with the electric spark machine head and the workpiece through conductor media; a power supply device is arranged in the electric spark power supply box; when the system monitors that the electrode moves to reach the gap breakdown distance with the workpiece, the power supply device performs breakdown discharge so as to start a processing cycle.
Further, the electric spark power box also comprises a gap detection circuit, wherein the gap detection circuit is used for detecting the distance between the electrode and the workpiece, and when the distance between the electrode and the workpiece is judged to be smaller than the gap breakdown distance, a trigger signal is sent to the power supply device, and a secondary step wave is output.
The invention also provides a composite pulse electric spark machining method, which comprises the following steps:
step 1, judging whether the distance between the electrode and the workpiece is smaller than the gap breakdown distance by using a gap detection circuit, if so, executing the step 2, otherwise, executing the step 1;
and 2, utilizing a composite pulse electric spark machining explosion power supply to send out a secondary step wave, utilizing a front stage in the secondary step wave as a breakdown pulse to breakdown the working solution, discharging the workpiece to enable the workpiece to be in a molten state, and then utilizing a rear stage in the secondary step wave to provide an explosion force pulse to throw out a machined product.
Compared with the prior art, the invention has the following advantages:
the composite pulse electric spark machining explosion power supply provided by the invention realizes the output pulse of the secondary step wave through the pulse generating device. The first-stage step wave is utilized to perform breakdown and ablation on the discharge gap, and the larger explosive force is obtained by shortening the front time of the second-stage high-peak pulse of the discharge step wave and increasing the peak current, so that the removal effect of the electric erosion product is enhanced.
In conclusion, the technical scheme of the invention utilizes reasonable electric parameters to realize the maximization of the energy utilization rate and the optimization of the blasting effect. Can be widely applied to micro-processing of various brittle and hard materials difficult to process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a composite pulse electric spark machining explosion-proof power supply structure according to the invention.
Fig. 2 is a block diagram of a composite pulse electric discharge machining system according to the present invention.
Fig. 3 is a schematic diagram of a pulse shaping circuit for power generation in an embodiment of the invention.
Fig. 4 is a schematic diagram of a power amplifying circuit according to an embodiment of the present invention.
In the figure:
1. the electric spark machine head comprises an electric spark machine head body, 2 parts, electrodes, 3 parts, a workpiece, 4 parts, working fluid, 5 parts, a working fluid tank, 6 parts, an electric spark power supply box, 7 parts, a gap detection circuit and 8 parts, and a pulse output power supply.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof. The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
The invention discloses a composite pulse electric spark machining explosion power supply, which is shown in figure 1 and comprises a waveform generating circuit, a comparison circuit, an amplifying circuit and a power switch circuit which are connected in sequence; the waveform generation circuit generates a secondary step wave original pulse and sends the original pulse signal to the comparison circuit; the comparison circuit is in the shape of comparing a high-low comparison voltage with two paths of different thresholds with the pulse signals respectively to form two paths of square wave pulse signals with the same phase, the same period and the proportional relation of duty ratio; the two paths of square wave signals are processed by the amplifying circuit and then respectively control the on and off of the high-voltage switching tube and the low-voltage switching tube, so that a secondary step wave is generated; the front stage in the second-stage ladder wave is a breakdown pulse, and plays a role in breakdown and corrosion on a discharge gap; the latter stage is to provide an explosive force pulse. The power switch circuit comprises two paths of power switch tubes for conducting and switching off the power supply, and the types of the power switch tubes can be adaptively selected according to the use requirements. In the above power supply structure, a direct digital frequency synthesis (DDS) packaged chip is used as a core unit for generation. So that it emits a second-order stepped square wave signal.
In another aspect, the present invention also provides a composite pulse electric discharge machining system, as shown in fig. 2-4, including a workpiece system and a power supply device as described in any one of the above. Specifically, the workpiece system comprises a clamp for clamping and immersing a workpiece in a working liquid tank filled with working liquid; the working electrode is arranged above the workpiece and fixedly connected with the electric spark machine head; an electric spark power supply box which is respectively connected with the electric spark machine head and the workpiece through conductor media; a power supply device is arranged in the electric spark power supply box; when the system monitors that the electrode moves to reach the gap breakdown distance with the workpiece, the power supply device performs breakdown discharge so as to start a processing cycle. The electric spark power box also comprises a gap detection circuit, wherein the gap detection circuit is used for detecting the distance between the electrode and the workpiece, and when the distance between the electrode and the workpiece is judged to be smaller than the gap breakdown distance, a trigger signal is sent to the power supply device, and a secondary step wave is output.
The system also comprises a working fluid circulation system and a cooling fluid circulation system, and the working fluid circulation system and the cooling fluid circulation system have auxiliary deionization besides cooling. In addition, the cooling liquid needs to be filtered and recovered in the circulating process of the liquid tank, so that the processing residues in the flushing liquid can be prevented from flowing into the discharge channel to influence the processing. In addition, the system also comprises an oscilloscope for measuring signals of the non-contact electric spark electric energy leading-in system, and simultaneously, the processing results are measured, and the optimization parameter processing is carried out according to the corresponding results of the two.
In another aspect, the invention also provides a composite pulse electric spark machining method, which comprises the following steps:
step 1, judging whether the distance between the electrode and the workpiece is smaller than the gap breakdown distance by using a gap detection circuit, if so, executing the step 2, otherwise, executing the step 1;
and 2, utilizing a composite pulse electric spark machining explosion power supply to send out a secondary step wave, utilizing a front stage in the secondary step wave as a breakdown pulse to breakdown the working solution, discharging the workpiece to enable the workpiece to be in a molten state, and then utilizing a rear stage in the secondary step wave to provide an explosion force pulse to throw out a machined product.
The technical scheme of the invention is further explained by the following specific embodiments:
example 1
The embodiment provides a composite pulse electric spark machining explosion power supply and a metal and composite material high-efficiency throwing electric spark machining system using the same, wherein in the working process of the system, a pulse output power supply 8 combines a high pulse and a low pulse into a two-stage ladder square wave. The pulse is transmitted to the tool electrode 2 through the circuit, and the tool electrode 2 is driven by the electric discharge machine head 1 to feed in the direction of the machined workpiece 3. When the tool electrode 2 and the machined workpiece 3 reach a certain distance, the first-order pulse in the second-order step pulse sent by the pulse output power supply 8 breaks down the gap working liquid 4, the machined workpiece 3 is discharged to be in a molten state, and then the machined product is thrown out through the explosive force sent by the second-order pulse. After the power supply discharges the machining gap once, the gap detection circuit 7 judges the discharge gap, and controls the electric spark machine head 1 to retract to prepare for the next round of discharge machining.
The system realizes the output pulse of the secondary step wave by using the pulse generating device according to the characteristic law of spark discharge explosion. The first-stage step wave is utilized to play a role in breakdown and corrosion on the discharge gap, and the larger explosive force is obtained by shortening the front time of the second-stage peak pulse of the discharge step wave and increasing the peak current, so that the removal effect of the electric corrosion product is enhanced. And the maximization of the energy utilization rate and the optimization of the blasting effect are realized by utilizing reasonable electric parameters.
As a preferred scheme of the present embodiment, the pulse shaping circuit for power generation as shown in fig. 2 compares the step waveforms sent by the DDS chip with a high-low two-way different threshold comparison voltages a1 and a 2. And finally, two paths of square wave pulse signals with the same phase, the same period and proportional duty ratio are formed.
As a preferred scheme of the embodiment, as shown in fig. 3, the power amplifying circuit performs power amplification on the 2 paths of signal pulses obtained in fig. 2 through two power driving chips, performs turn-off and turn-on control on the power MOSFET, and finally synthesizes the obtained waveforms, thereby obtaining the second-order step square wave pulse required by the explosion-increasing power supply. The form of the amplifying circuit can be changed according to the system requirement, and is not described in detail herein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (2)
1. The processing method of the composite pulse electric spark processing system is characterized by comprising a waveform generating circuit, a comparison circuit, an amplifying circuit and a power switch circuit which are connected in sequence;
the waveform generation circuit generates a secondary step wave original pulse and sends a signal of the original pulse to the comparison circuit; the comparison circuit is in the shape of comparing a high-low comparison voltage with two paths of different thresholds with the pulse signals respectively to form two paths of square wave pulse signals with the same phase, the same period and the proportional relation of duty ratio; the two paths of square wave pulse signals are processed by the amplifying circuit and then respectively control the on and off of the high-voltage switching tube and the low-voltage switching tube, so that a secondary step wave is generated; the front stage in the second-stage ladder wave is a breakdown pulse, and plays a role in breakdown and corrosion on a discharge gap; the latter stage provides explosive force pulse;
the energy utilization rate maximization and the optimization of the blasting effect are realized by utilizing the secondary step wave type processing pulse and combining the electric parameters;
the composite pulse electric spark machining explosion power supply and the workpiece system form a composite pulse electric spark machining system, wherein:
the workpiece system comprises a clamp for clamping and immersing a workpiece in a working liquid tank filled with working liquid; the working electrode is arranged above the workpiece and fixedly connected with the electric spark machine head; an electric spark power supply box which is respectively connected with the electric spark machine head and the workpiece through conductor media; a power supply device is arranged in the electric spark power supply box; when the system monitors that the electrode moves to a gap breakdown distance from the workpiece, the power supply device performs breakdown discharge so as to start a processing period;
the electric spark power supply box comprises a gap detection circuit, wherein the gap detection circuit is used for detecting the distance between an electrode and a workpiece, and sending a trigger signal to the power supply device when the distance between the electrode and the workpiece is judged to be smaller than the gap breakdown distance, and outputting a secondary step wave;
the processing method of the composite pulse electric spark processing system comprises the following steps:
step 1, judging whether the distance between the electrode and the workpiece is smaller than the gap breakdown distance by using a gap detection circuit, if so, executing the step 2, otherwise, executing the step 1;
and 2, utilizing a composite pulse electric spark machining explosion power supply to send out a secondary step wave, utilizing a front stage in the secondary step wave as a breakdown pulse to breakdown the working solution, discharging the workpiece to enable the workpiece to be in a molten state, and then utilizing a rear stage in the secondary step wave to provide an explosion force pulse to throw out a machined product.
2. The method of claim 1, wherein the power switching circuit comprises two power switching transistors for controlling on and off of the power supply.
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| CN201810909681.1A CN108746892B (en) | 2018-08-10 | 2018-08-10 | Composite pulse electric spark machining spray explosion power supply, system and method |
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| CN201810909681.1A CN108746892B (en) | 2018-08-10 | 2018-08-10 | Composite pulse electric spark machining spray explosion power supply, system and method |
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| CN108746892B true CN108746892B (en) | 2024-02-09 |
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| CN107598312A (en) * | 2017-04-28 | 2018-01-19 | 上海汉霸机电有限公司 | A kind of spark machining electric discharge staircase waveform power circuit |
| CN208644312U (en) * | 2018-08-10 | 2019-03-26 | 大连交通大学 | A compound pulse EDM blasting power supply and system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10022812B2 (en) * | 2014-10-09 | 2018-07-17 | General Electric Company | Methods for the electroerosion machining of high-performance metal alloys |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201220323Y (en) * | 2007-02-14 | 2009-04-15 | 杨仕桐 | Precise resistance welding spot welding machine |
| CN201175797Y (en) * | 2008-04-08 | 2009-01-07 | 哈尔滨工业大学 | High and low voltage composite pulse power supply for EDM small hole machining |
| CN104475886A (en) * | 2014-12-25 | 2015-04-01 | 西安建筑科技大学 | Chopped-mode energy-saving electromachining pulse power supply |
| CN105772880A (en) * | 2016-04-27 | 2016-07-20 | 大连交通大学 | Method for high-speed electrosparking of abrasive material water nozzle inner hole |
| CN107598312A (en) * | 2017-04-28 | 2018-01-19 | 上海汉霸机电有限公司 | A kind of spark machining electric discharge staircase waveform power circuit |
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