CN105269090A - Electric spark discharging machining device special for PCD materials - Google Patents
Electric spark discharging machining device special for PCD materials Download PDFInfo
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- CN105269090A CN105269090A CN201510700840.3A CN201510700840A CN105269090A CN 105269090 A CN105269090 A CN 105269090A CN 201510700840 A CN201510700840 A CN 201510700840A CN 105269090 A CN105269090 A CN 105269090A
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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
- B23H1/022—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges for shaping the discharge pulse train
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention discloses an electric spark discharging machining device special for PCD materials. The electric spark discharging machining device comprises a positive electrode, a negative electrode connected with the to-be-machined PCD materials, a high-voltage discharging power source, a low-voltage discharging power source, a machining-state monitoring module and a pulse generation module. The positive electrode is connected with one end of an inductor in series, and after the low-voltage discharging power source is connected with a low-voltage power switch tube in series, one end of the low-voltage positive electrode side of the low-voltage discharging power source is connected to the other end of the inductor. The machining-state monitoring module comprises a sampling module, a configuration module, a high speed comparing module and an output module, wherein the sampling module, the configuration module, the high speed comparing module and the output module are sequentially connected. The sampling module further comprises a first resistor and a second resistor which are connected in series. The end, opposite to the first resistor, of the second resistor serves as a sampling output end, and a first diode is located between a joint of the sampling output end and the second resistor and a grounding end. By means of the electric spark discharging machining device, real-time detection for a single discharge pulse is achieved, the accuracy and the reliability for detecting the gap state are greatly improved, and small pulse width machining is carried out on the PCD materials.
Description
Technical field
The present invention relates to a kind of spark discharge processing unit (plant) being exclusively used in PCD material, belong to spark erosion technique field.
Background technology
Polycrystalline diamond (PolycrystallineDiamond, be called for short PCD) be 20 century 70s since begin one's study in the world use novel superhard material, it has close to the hardness of natural diamond, wearability and the impact resistance suitable with carbide alloy, stable chemical performance, is widely used in fields such as precision cuttings.Polycrystalline diamond has excellent property, but because it is shaping and surface finishing is very difficult, seriously hampers applying of it.Therefore, study its processing method to seem particular importance.
The processing difficult problem that current Chinese scholars is brought for high rigidity and the high-wearing feature of PCD material has carried out large quantifier elimination and test, comprising spark machined, Laser Processing, chemical process, Ultrasonic machining etc., and achieves certain effect.But comprehensively analyze discovery, these process technologies are the roughing being applicable to PCD material at present more.In all these technology, spark machined and EDM Grinding polycrystalline diamond are the processing methods of high efficiency, low cost, but they can not process large-area polycrystalline diamond effectively.Its technical bottleneck mainly contains 2 aspects, and one is the raw-material production technology of heavy in section PCD.The main production and supply Guo Shi U.S., Britain and Japan, can produce the PCD material blank of diameter 80mm in the world; Domestic current mature technology can produce the PCD material blank of diameter 50mm.Second is exactly the high-precision surface processing of PCD blank material, cutting forming, and finished product blade tool weares and teares later finishing etc., all seriously governs the development of industry; Particularly diameter is greater than the best bright finish Surface Machining of the PCD blank of 50mm, and hi-precision cutting forming technique.So be also the state that is in that supply falls short of demand to the demand of this type of lathe.
Summary of the invention
The object of the invention is to provide a kind of spark discharge processing unit (plant) being exclusively used in PCD material, this spark discharge processing unit (plant) achieves the real-time detection of single discharge pulse, substantially increase accuracy and reliability that gap state is detected, and small pulse width is carried out to PCD material process.
For achieving the above object, the technical solution used in the present invention is: a kind of spark discharge processing unit (plant) being exclusively used in PCD material, comprise positive electrode, the negative electrode be connected with PCD material to be processed, electrion power supply, low pressure discharge power supply, drilling monitoring module, pulse generating module, described positive electrode is connected with an inductance one end, described low pressure discharge power supply and a low-voltage power switch pipe contact after its low pressure side of the positive electrode one end be connected to the inductance other end, corresponding low pressure negative side one end is connected to described negative electrode, thus forms low pressure discharge loop; Described electrion power supply and a high-voltage circuit breaker pipe contact after its one end, high-voltage positive electrode side be connected to the inductance other end, one end, corresponding high voltage negative side is connected to described negative electrode, thus formed electrion loop;
The two ends of described drilling monitoring module are connected respectively to positive electrode and negative electrode, for sampling to real-time work pieces process gap state, sampled value is converted to machining state signal to export, the input of described pulse generating module is connected to the output of drilling monitoring module, first output of pulse generating module and the second output are connected respectively to high-voltage circuit breaker pipe and low-voltage power switch pipe gate pole separately, this pulse generating module is according to the machining state from drilling monitoring module feedback, produce for controlling the high-voltage pulse control signal of high-voltage circuit breaker pipe break-make and the action of low-voltage pulse control signal for controlling low-voltage power switch pipe break-make,
Described drilling monitoring module comprises: the sampling module connected successively, configuration module, high speed comparison module and output module, described sampling module comprises the first resistance of series winding further, second resistance, second resistance and the opposing one end of the first resistance are as sampled output, first diode is between the contact and earth terminal of sampled output and the second resistance, second diode is between the contact and power end of sampled output and the second resistance, described first diodes in parallel has filter capacitor, described second diodes in parallel has the 3rd resistance, contact between first diode and earth terminal is connected to the contact between described positive electrode and inductance as high voltage input terminal, first resistance and the opposing one end of the second resistance are connected to negative electrode as low pressure input.
The technical scheme improved further in technique scheme is as follows:
1., as preferred, described low pressure discharge loop, electrion loop are connected with the first current-limiting resistance and the second current-limiting resistance respectively.
2., as preferably, described output module comprises a pull-up resistor between power end and the output of high speed comparison module, the 3rd current-limiting resistance of series connection and LED display lamp in parallel with described pull-up resistor, this LED display lamp is for showing gap state.
Because technique scheme is used, the present invention compared with prior art has following advantages and effect:
The present invention is exclusively used in the spark discharge processing unit (plant) of PCD material, interfering signal very high when which obviating electric discharge is to the interference problem of discharge pulse testing circuit, achieve the real-time detection of single discharge pulse, substantially increase the accuracy to gap state detection and reliability, and small pulse width is carried out to PCD material process, achieve Arc-free spark machined, there is not abnormal work situation under adopting the processing electric current situation of this processing unit (plant) 30A, the fineness on surface during fine finishining is also improved greatly.
Accompanying drawing explanation
Accompanying drawing 1 is exclusively used in the spark discharge processing unit (plant) structural representation of PCD material for the present invention;
Accompanying drawing 2 is sampling module structural representation in spark discharge processing unit (plant) of the present invention.
In above accompanying drawing: 1, positive electrode; 2, negative electrode; 3, electrion power supply; 4, low pressure discharge power supply; 5, drilling monitoring module; 6, pulse generating module; 7, inductance; 8, low-voltage power switch pipe; 9, high-voltage circuit breaker pipe; 10, sampling module; 101, the first resistance; 102, the second resistance; 103, the first diode; 104, the second diode; 105, filter capacitor; 106, the 3rd resistance; 11, configuration module; 12, high speed comparison module; 121, operational amplifier; 13, output module; 131, pull-up resistor; 132, the 3rd current-limiting resistance; 133, LED display lamp; 14, the first current-limiting resistance; 15, the second current-limiting resistance.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
Embodiment 1: a kind of spark discharge processing unit (plant) being exclusively used in PCD material, comprise positive electrode 1, the negative electrode 2 be connected with PCD material to be processed, electrion power supply 3, low pressure discharge power supply 4, drilling monitoring module 5, pulse generating module 6, described positive electrode 1 is connected with inductance 7 one end, described low pressure discharge power supply 4 and a low-voltage power switch pipe 8 contact after its low pressure side of the positive electrode one end be connected to inductance 7 other end, corresponding low pressure negative side one end is connected to described negative electrode 2, thus forms low pressure discharge loop; Described electrion power supply 3 and a high-voltage circuit breaker pipe 9 contact after its one end, high-voltage positive electrode side be connected to inductance 7 other end, one end, corresponding high voltage negative side is connected to described negative electrode 2, thus formed electrion loop;
The two ends of described drilling monitoring module 5 are connected respectively to positive electrode 1 and negative electrode 2, for sampling to real-time work pieces process gap state, sampled value is converted to machining state signal to export, the input of described pulse generating module 6 is connected to the output of drilling monitoring module 5, first output of pulse generating module 6 and the second output are connected respectively to high-voltage circuit breaker pipe 9 and the respective gate pole of low-voltage power switch pipe 8, this pulse generating module 6 is according to the machining state fed back from drilling monitoring module 5, produce for controlling the high-voltage pulse control signal of high-voltage circuit breaker pipe 9 break-make and the action of low-voltage pulse control signal for controlling low-voltage power switch pipe 8 break-make,
Described drilling monitoring module 5 comprises: the sampling module 10 connected successively, configuration module 11, high speed comparison module 12 and output module 13, described sampling module 10 comprises the first resistance 101 of series winding further, second resistance 102, second resistance 102 and the opposing one end of the first resistance 101 are as sampled output, first diode 103 is between the contact and earth terminal of sampled output and the second resistance 102, second diode 104 is between the contact and power end of sampled output and the second resistance 102, described first diode 103 is parallel with filter capacitor 105, described second diode 104 is parallel with the 3rd resistance 106, contact between first diode 103 and earth terminal is connected to the contact between described positive electrode 1 and inductance 7 as high voltage input terminal, first resistance 101 and the opposing one end of the second resistance 102 are connected to negative electrode 2 as low pressure input.
Above-mentioned low pressure discharge loop, electrion loop are connected with the first current-limiting resistance 14 and the second current-limiting resistance 15 respectively.
Embodiment 2: a kind of spark discharge processing unit (plant) being exclusively used in PCD material, comprise positive electrode 1, the negative electrode 2 be connected with PCD material to be processed, electrion power supply 3, low pressure discharge power supply 4, drilling monitoring module 5, pulse generating module 6, described positive electrode 1 is connected with inductance 7 one end, described low pressure discharge power supply 4 and a low-voltage power switch pipe 8 contact after its low pressure side of the positive electrode one end be connected to inductance 7 other end, corresponding low pressure negative side one end is connected to described negative electrode 2, thus forms low pressure discharge loop; Described electrion power supply 3 and a high-voltage circuit breaker pipe 9 contact after its one end, high-voltage positive electrode side be connected to inductance 7 other end, one end, corresponding high voltage negative side is connected to described negative electrode 2, thus formed electrion loop;
The two ends of described drilling monitoring module 5 are connected respectively to positive electrode 1 and negative electrode 2, for sampling to real-time work pieces process gap state, sampled value is converted to machining state signal to export, the input of described pulse generating module 6 is connected to the output of drilling monitoring module 5, first output of pulse generating module 6 and the second output are connected respectively to high-voltage circuit breaker pipe 9 and the respective gate pole of low-voltage power switch pipe 8, this pulse generating module 6 is according to the machining state fed back from drilling monitoring module 5, produce for controlling the high-voltage pulse control signal of high-voltage circuit breaker pipe 9 break-make and the action of low-voltage pulse control signal for controlling low-voltage power switch pipe 8 break-make,
Described drilling monitoring module 5 comprises: the sampling module 10 connected successively, configuration module 11, high speed comparison module 12 and output module 13, described sampling module 10 comprises the first resistance 101 of series winding further, second resistance 102, second resistance 102 and the opposing one end of the first resistance 101 are as sampled output, first diode 103 is between the contact and earth terminal of sampled output and the second resistance 102, second diode 104 is between the contact and power end of sampled output and the second resistance 102, described first diode 103 is parallel with filter capacitor 105, described second diode 104 is parallel with the 3rd resistance 106, contact between first diode 103 and earth terminal is connected to the contact between described positive electrode 1 and inductance 7 as high voltage input terminal, first resistance 101 and the opposing one end of the second resistance 102 are connected to negative electrode 2 as low pressure input.
Above-mentioned low pressure discharge loop, electrion loop are connected with the first current-limiting resistance 14 and the second current-limiting resistance 15 respectively.
Above-mentioned output module 13 comprises a pull-up resistor 131 between power end and the output of high speed comparison module 12,3rd current-limiting resistance 132 and the LED display lamp 133 of series connection are in parallel with described pull-up resistor 131, and this LED display lamp 133 is for showing gap state.
Sampling module 10, sampled signal high voltage is connect sampling system ground, sampled signal low-voltage is as input.
High speed comparison module 12, mainly realizes the high-speed transitions of gap voltage, and the comparative level of the discharge gap voltage signal that sampling comparison circuit quantizes by the comparison circuit be made up of LM311 and configuration compares.
Configuration module 11, quantizes the gap voltage signal of input, and removing high-frequency impulse interference wherein, be configured comparative level, configuration comparative voltage and discharge voltage compare.
Output module 13, inputs the result comparing output, and input subordinate treatment circuit processes.
Adopt above-mentioned when being exclusively used in the spark discharge processing unit (plant) of PCD material, interfering signal very high when which obviating electric discharge is to the interference problem of discharge pulse testing circuit, achieve the real-time detection of single discharge pulse, substantially increase the accuracy to gap state detection and reliability, and small pulse width is carried out to PCD material process, achieve Arc-free spark machined, there is not abnormal work situation under adopting the processing electric current situation of this processing unit (plant) 30A, the fineness on surface during fine finishining is also improved greatly.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (3)
1. one kind is exclusively used in the spark discharge processing unit (plant) of PCD material, it is characterized in that: comprise positive electrode (1), the negative electrode (2) be connected with PCD material to be processed, electrion power supply (3), low pressure discharge power supply (4), drilling monitoring module (5), pulse generating module (6), described positive electrode (1) is connected with an inductance (7) one end, described low pressure discharge power supply (4) and a low-voltage power switch pipe (8) its low pressure side of the positive electrode one end afterwards of contact is connected to inductance (7) other end, corresponding low pressure negative side one end is connected to described negative electrode (2), thus form low pressure discharge loop, described electrion power supply (3) and a high-voltage circuit breaker pipe (9) contact after its one end, high-voltage positive electrode side be connected to inductance (7) other end, one end, corresponding high voltage negative side is connected to described negative electrode (2), thus formation electrion loop,
The two ends of described drilling monitoring module (5) are connected respectively to positive electrode (1) and negative electrode (2), for sampling to real-time work pieces process gap state, sampled value is converted to machining state signal to export, the input of described pulse generating module (6) is connected to the output of drilling monitoring module (5), first output of pulse generating module (6) and the second output are connected respectively to high-voltage circuit breaker pipe (9) and the respective gate pole of low-voltage power switch pipe (8), this pulse generating module (6) is according to the machining state fed back from drilling monitoring module (5), produce for controlling the high-voltage pulse control signal of high-voltage circuit breaker pipe (9) break-make and the action of low-voltage pulse control signal for controlling low-voltage power switch pipe (8) break-make,
Described drilling monitoring module (5) comprising: the sampling module (10) connected successively, configuration module (11), high speed comparison module (12) and output module (13), described sampling module (10) comprises first resistance (101) of series winding further, second resistance (102), the opposing one end of second resistance (102) and the first resistance (101) is as sampled output, between the contact that first diode (103) is positioned at sampled output and the second resistance (102) and earth terminal, between the contact that second diode (104) is positioned at sampled output and the second resistance (102) and power end, described first diode (103) is parallel with filter capacitor (105), described second diode (104) is parallel with the 3rd resistance (106), contact between first diode (103) and earth terminal is connected to the contact between described positive electrode (1) and inductance (7) as high voltage input terminal, the opposing one end of first resistance (101) and the second resistance (102) is connected to negative electrode (2) as low pressure input.
2. the spark discharge processing unit (plant) being exclusively used in PCD material according to claim 1, is characterized in that: described low pressure discharge loop, electrion loop are connected with the first current-limiting resistance (14) and the second current-limiting resistance (15) respectively.
3. the spark discharge processing unit (plant) being exclusively used in PCD material according to claim 1, it is characterized in that: described output module (13) comprises the pull-up resistor (131) between an output being positioned at power end and high speed comparison module (12), 3rd current-limiting resistance (132) and the LED display lamp (133) of series connection are in parallel with described pull-up resistor (131), and this LED display lamp (133) is for showing gap state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510700840.3A CN105269090A (en) | 2015-10-26 | 2015-10-26 | Electric spark discharging machining device special for PCD materials |
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| CN201510700840.3A CN105269090A (en) | 2015-10-26 | 2015-10-26 | Electric spark discharging machining device special for PCD materials |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107775128A (en) * | 2016-08-31 | 2018-03-09 | 山东豪迈机械科技股份有限公司 | Electrical discharge machining pulse power and its control method |
| CN109128401A (en) * | 2017-06-16 | 2019-01-04 | 科锐精密工业（深圳）有限公司 | A kind of device for capillary processing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20160127 |