CN105880757B - Efficient electric spark milling process method in gas - Google Patents
Efficient electric spark milling process method in gas Download PDFInfo
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- CN105880757B CN105880757B CN201610392051.2A CN201610392051A CN105880757B CN 105880757 B CN105880757 B CN 105880757B CN 201610392051 A CN201610392051 A CN 201610392051A CN 105880757 B CN105880757 B CN 105880757B
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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
-
- 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
-
- 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
- B23H1/04—Electrodes specially adapted therefor or their manufacture
-
- 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
- B23H1/10—Supply or regeneration of working media
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention belongs to special process field, it is related to efficient electric spark milling process method in a kind of gas.The present invention passes through the peak point current and pulse width that processing gap input energy is significantly increased, and guarantees that the workpiece material of sufficient amount is melted, then guarantees effective discharge of machining chips and being fully cooled for tool-electrode by high-speed air flow and high speed electrode rotary.Processing efficiency of this method in processing stainless steel and titanium alloy etc materials reaches 5000mm3/ min or more, so that the efficiency of electrical discharge machining reaches machining level for the first time.Economy, the environmental protection, rapid processing of large-scale type chamber, complex parts of high-strength high hard conductive material etc. can be achieved.
Description
Technical field
The invention belongs to special process field, it is related to efficient electric spark milling process method in a kind of gas.
Background technique
Electrical discharge machining is to connect the positive and negative anodes of direct current pulse power source on workpiece and tool-electrode, and dielectric is full of processing
Gap removes material by the high-temperature plasma of discharge breakdown dielectric formation.This non-contacting processing method, can be with
The material of any conduction is processed, and does not have to the intensity for considering it, hardness, the physical properties such as viscosity.It is widely used in aviation boat
It, automobile manufacture, the fields such as bioengineering.The technology is when using liquid dielectric, due to the decomposition meeting of liquid medium
Generation environment pollution.And dry type electrical discharge machining uses air as dielectric, has not only saved cost, but also reduces environment
Pollution.The improvement of processing environment can also increase the job enthusiasm and efficiency of worker, promote corporate image.However, lower add
Work efficiency rate is always to restrict the widely applied bottleneck of this technology.Domestic and international experts and scholars carry out to improve its processing efficiency
A large amount of exploration, however effect is not obvious, processing efficiency highest only arrives 60mm3/ min, this adds far below tradition machinery
Thousands of mm of work3/min。
Summary of the invention
Present invention seek to address that the poor efficiency of existing dry type electric discharge machining method, proposes efficient electrical discharge machining in gas
Method.This method processes the peak point current and pulse width of gap input energy by increasing, and guarantees the workpiece material of sufficient amount
It is melted, then guarantees that being effectively discharged for machining chips is abundant with tool-electrode by high-speed air flow and the electrode rotary of high speed
It is cooling.Processing efficiency of this method in processing stainless steel and titanium alloy etc materials reaches 5000mm3/ min or more, so that electrical fire
The efficiency of flower processing reaches machining level for the first time.Large-scale type chamber, the complex parts etc. of high-strength high hard conductive material can be achieved
Economy, environmental protection, rapid processing.
The present invention is achieved by the following technical solutions.The positive and negative anodes of high power pulsed source are separately connected workpiece and electricity
Pole, high power pulsed source provides enough machining energies and gives processing gap, to melt enough workpiece materials；High speed rotation
Graphite electrode under the drive of main shaft to workpiece servo feed, and keep the minim gap of a maintenance electrical discharge machining；It is empty
The air stream of high-voltage high-speed is passed through processing gap by the inside of coreless armature by air compressor, and it is broken that air stream plays exclusion processing
The effect of bits and cooling electrode.
The high power pulsed source refers to 100~1000A of peak point current, 70~310V of crest voltage, pulse width and
0.1~1000ms of pulse interval modulation range.
200~3000r/min of the high-speed rotary main shaft rotational speed regulation range.
The graphite electrode is high purity graphite thick-walled pipe, 4~30mm of external diametrical extent, 1~10mm of inside diameter ranges.
The graphite electrode is to workpiece servo feed, 0.001~15m/min of velocity interval.
0.1~0.7MPa of pressure regulation spectrum of the high-voltage high-speed air stream, 2~17m of flow velocity adjustable range3/h。
The internal diameter of graphite hollow edged electrode used in the embodiment of the present invention is 4mm, outer diameter 12mm, this and conventional dry electrical fire
The thin-walled tubular electrode that flower processing uses is different.It is processing the reason of heavy wall graphite-pipe that conventional dry electrical discharge machining, which cannot use,
Gap is very small, and machining chips are difficult to be discharged when heavy wall.The machining energy of this method is bigger than conventional dry electrical discharge machining to be obtained
It is more, so as to cause biggish processing gap and preferable chip removal effect；Biggish wall thickness can increase the processing effect of this kind of method
Rate, and lesser internal diameter is capable of increasing the speed of air stream, so as to improve chip removal effect；The graphite electrode rotation that this method uses
Rotary speed range is 500~3000rpm, this is faster than 100~300rpm that conventional dry electrical discharge machining uses, the electricity of high speed
Pole rotates the effective discharge for being also beneficial to clast.
Detailed description of the invention
Efficient electric spark milling process method schematic diagram in Fig. 1 gas.
Specific embodiment
It elaborates with reference to the accompanying drawing to the embodiment of the present invention, the present embodiment before being with technical solution of the present invention
It puts and is implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to down
The embodiment stated.
As shown in Figure 1, the specific embodiment of the invention is the following steps are included: 1 clamping of heavy wall tubulose graphite electrode has
On the machine tool chief axis 3 of interior inflation function, servo motor 2 drives 3 high speed rotation of main shaft by belt, while passing through servo motor 4
It drives main shaft 3 and graphite electrode 1 to carry out servo feed to workpiece 5 to move, servo motor 4 is controlled by feedback control system 6
Movement guarantees that electro-discharge machining is stablized and carries out to adjust processing clearance distance.The positive and negative anodes of high power pulsed source 7 are separately connected
On graphite electrode 1 and workpiece 5, sufficiently high energy is provided for processing gap to melt workpiece material.Air compressor 8 passes through
The inner hole of machine tool chief axis 3 and the inner hole of graphite electrode 1 provide high-speed air flow to processing gap, and air stream, which plays, quickly to be excluded to add
The effect of work clast and cooling electrode.
Embodiment 1:
Workpiece material is stainless steel AISI 304, size 60mm × 12mm × 4mm；Electrode is high purity graphite pipe, internal diameter
4mm, outer diameter 12mm；Machining medium is high-speed air, air compressor maximum pressure 0.7MPa；Utilize pulse width 9ms, pulse
It is spaced 2ms, the power parameter of crest voltage 250V, peak point current 600A are processed, and workpiece connects positive polarity, air flow pressure
0.7MPa, milling machine main shaft rotary speed 3000rpm used, lateral servo feed speed 6m/min, single step feeding depth
The depth of 1mm, Milling Process gained trench structure are 2mm, width 12mm, length 50mm, processing efficiency 5162mm3/
Min, the comparative electrode proportion of goods damageds are 15%.
Embodiment 2:
Workpiece material is titanium alloy ti6al4v, size 55mm × 12mm × 5mm；Pulse width used is 10ms, peak value electricity
Pressure is 300V, remaining parameter is in the same manner as in Example 1, processing efficiency 5862mm3/ min, the comparative electrode proportion of goods damageds are 1.5%.
Claims (1)
1. efficient electric spark milling process method in a kind of gas, it is characterised in that: high power pulsed source provides sufficiently high add
Work energy gives processing gap, and tubular graphene electrode high speed rotation and to workpiece servo feed, the air stream of high-voltage high-speed passes through sky
The inside of heart electrode is passed through processing gap；The high power pulsed source, the peak point current of power supply are 100~1000A, peak
Threshold voltage is 70~310V, and pulse width and pulse interval modulation range are 0.1~1000ms；The tubular graphene electrode is
High purity graphite thick-walled pipe, external diametrical extent are 4~30mm, and inside diameter ranges are 1~10mm；The high speed rotation electrode, electrode
Rotation speed is 200~3000r/min；The servo feed, speed are 0.001~15m/min；The high-voltage high-speed is empty
Air-flow, pressure regulation spectrum are 0.1~0.7MPa, and flow velocity adjustable range is 2~17m3/h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610392051.2A CN105880757B (en) | 2016-06-02 | 2016-06-02 | Efficient electric spark milling process method in gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610392051.2A CN105880757B (en) | 2016-06-02 | 2016-06-02 | Efficient electric spark milling process method in gas |
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| Publication Number | Publication Date |
|---|---|
| CN105880757A CN105880757A (en) | 2016-08-24 |
| CN105880757B true CN105880757B (en) | 2018-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610392051.2A Active CN105880757B (en) | 2016-06-02 | 2016-06-02 | Efficient electric spark milling process method in gas |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101168204A (en) * | 2007-11-22 | 2008-04-30 | 上海交通大学 | Air blast electric spark processing method in liquid |
| CN103433576A (en) * | 2013-09-13 | 2013-12-11 | 哈尔滨工业大学 | Self-inductive-internal flushing liquid electric spark processing method for metal with insulating ceramic coating |
| CN103962658A (en) * | 2014-05-07 | 2014-08-06 | 厦门大学 | Micro jet flow electrode electrosparking device |
-
2016
- 2016-06-02 CN CN201610392051.2A patent/CN105880757B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101168204A (en) * | 2007-11-22 | 2008-04-30 | 上海交通大学 | Air blast electric spark processing method in liquid |
| CN103433576A (en) * | 2013-09-13 | 2013-12-11 | 哈尔滨工业大学 | Self-inductive-internal flushing liquid electric spark processing method for metal with insulating ceramic coating |
| CN103962658A (en) * | 2014-05-07 | 2014-08-06 | 厦门大学 | Micro jet flow electrode electrosparking device |
Non-Patent Citations (1)
| Title |
|---|
| 超声辅助气中电火花铣削加工研究;苏树鹏等;《中国机械工程》;20080930;第19卷(第18期);第2227-2230页 * |
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| CN105880757A (en) | 2016-08-24 |
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