CN110576239A - Arc milling device and method for rotating arc - Google Patents
Arc milling device and method for rotating arc Download PDFInfo
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- CN110576239A CN110576239A CN201910860856.9A CN201910860856A CN110576239A CN 110576239 A CN110576239 A CN 110576239A CN 201910860856 A CN201910860856 A CN 201910860856A CN 110576239 A CN110576239 A CN 110576239A
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- 238000003801 milling Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims description 23
- 238000003754 machining Methods 0.000 claims abstract description 68
- 230000003068 static effect Effects 0.000 claims abstract description 58
- 238000010891 electric arc Methods 0.000 claims abstract description 37
- 238000011010 flushing procedure Methods 0.000 claims description 35
- 239000007788 liquid Substances 0.000 claims description 30
- 230000005284 excitation Effects 0.000 claims description 8
- 238000002242 deionisation method Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 21
- 238000003672 processing method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- 238000010892 electric spark Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/013—Arc cutting, gouging, scarfing or desurfacing
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- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention discloses an arc milling device and a processing method of a rotating arc, wherein the processing device comprises: a tool electrode and a static longitudinal magnetic field generating device; the tool electrode is provided with a first end and a second end, the tool electrode is provided with a high-voltage rush current channel which is communicated from the first end to the second end, the tool electrode is used for machining a workpiece to be milled and machined, and the tool electrode and the workpiece electrode are powered by a direct-current power supply; the static longitudinal magnetic field generating device is arranged on the tool electrode and used for generating a static longitudinal uniform magnetic field so that the second end of the tool electrode utilizes a rotating electric arc to perform electric arc milling processing on the workpiece electrode in the static longitudinal uniform magnetic field. The invention improves the speed and quality of milling and improves the processing efficiency of arc milling of difficult-to-cut materials.
Description
Technical Field
The invention relates to the field of special machining, in particular to an electric arc milling device and method for a rotating electric arc.
Background
The mature traditional mechanical cutting method at present can not realize the high-efficiency processing of materials which are difficult to cut, such as titanium alloy, nickel-based high-temperature alloy and the like. The spark discharge machining can obtain better surface quality and precision, but because the spark discharge process is point-by-point discharge, and an interelectrode medium deionization stage exists in the discharge process, if the stage is omitted or the time of the stage is too short, the working medium can not recover the insulation state, so that a stable electric arc can be formed near the previous discharge position, repeated discharge can be caused, and the workpiece can be burnt, therefore, the interelectrode medium deionization stage is an unavoidable spark discharge process, and the workpiece is intermittently eroded during the machining, so that the efficiency is low.
At present, a direct current electric arc electric spark processing method is provided, a tool electrode used in the method is a hollow electrode, liquid is flushed inside the tool electrode, and a direct current power supply is adopted to replace a pulse power supply for supplying power, so that electric spark processing can be continuously carried out, the processing process is prevented from being interrupted due to pulse intervals, and the electric spark processing speed is greatly improved.
the other rotating arc coupling discharge milling device applies a rotating magnetic field around a tool electrode by utilizing the electromechanical principle, and influences the arc form of the discharge of the tool electrode through the magnetic field. The method is only suitable for the condition that the tool electrode does not rotate, and the electromagnetic coupling device needs at least two groups of coils with certain spatial difference. However, the force applied by the electric arc is not uniform in the movement process of the rotating magnetic field, so that the milling process is extremely unstable, and the processing efficiency is influenced. And the electromagnetic coupling device is very complicated and difficult to process, and is not suitable for actual processing.
The traditional electric spark machining method for machining the difficult-to-cut material is low in efficiency, and the demand for the difficult-to-cut material is increased along with the rapid development of the aerospace field, so that a novel electric spark machining method for realizing high-speed machining of the difficult-to-cut material is needed.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the first aspect of the present invention is to provide an arc milling device using a rotating arc, which is capable of efficiently processing a material difficult to cut, has a simple apparatus, is cost-effective, and facilitates modification of a machine tool.
According to an embodiment of the first aspect of the present invention, an arc milling apparatus for rotating an arc includes:
The tool electrode is provided with a first end and a second end, the tool electrode is provided with a high-voltage rush current channel which penetrates from the first end to the second end, the tool electrode is used for machining a workpiece to be milled and machined, and the tool electrode and the workpiece electrode are powered by a direct-current power supply;
the static longitudinal magnetic field generating device is arranged on the tool electrode and used for generating a static longitudinal uniform magnetic field so that the second end of the tool electrode performs arc milling on the workpiece electrode by utilizing a rotating electric arc in the static longitudinal uniform magnetic field.
According to the arc milling device for the rotating arc, which is disclosed by the embodiment of the first aspect of the invention, the milling speed and quality are mainly improved, the static longitudinal magnetic field generating device is arranged around the tool electrode, the additional longitudinal static magnetic field is uniformly distributed at the processing end of the tool electrode, the moving arc can be uniformly stressed, the Lorentz force is the maximum value, and even if the tool electrode does not rotate, the Lorentz force can pull the arc to do high-speed spiral motion around the axis of the tool electrode, so that the material can be continuously etched. In addition, the longitudinal static magnetic field can enable the electric arc to be homogenized and contracted, the electric arc form is effectively controlled, the electric arc discharge energy is more concentrated at the second end of the tool electrode, the rotating electric arc rotates stably at a machining position at a high speed, the workpiece electrode is continuously eroded, and the machining efficiency of arc milling of difficult-to-cut materials is improved. The high-pressure rush current channel can convey high-pressure liquid or high-pressure gas, the high-pressure liquid or the high-pressure gas can enter the high-pressure rush current channel from the first end and flow out from the second end to rush to the ongoing milling area, machining chips and heat in the machining area are quickly taken away, deionization can be effectively carried out, and continuous implementation of the discharge machining process is guaranteed. In summary, the arc milling device of the rotating arc according to the embodiment of the first aspect of the invention can work at high speed, has high efficiency and simple equipment, saves cost and is convenient for the reconstruction of a machine tool.
According to an embodiment of the first aspect of the present invention, the static longitudinal magnetic field generating device is any one of a dc electromagnetic coil, a dc excitation device and a permanent magnet, and the tool electrode is inserted into the dc electromagnetic coil, the dc excitation device or the permanent magnet.
According to some embodiments of the first aspect of the present invention, the static longitudinal magnetic field generating means is longitudinally movably arranged on the tool electrode.
According to some embodiments of the first aspect of the present invention, the tool electrode further comprises a motor coupled to the tool electrode for driving rotational movement of the tool electrode.
According to a further embodiment of the first aspect of the invention, the electric machine is a hollow machine.
According to some embodiments of the first aspect of the present invention, the machining apparatus further comprises a side auxiliary flushing device for continuously supplying a high-pressure flushing liquid or a high-pressure gas to the machining region from a side between the tool electrode and the workpiece electrode.
Some embodiments according to the first aspect of the present disclosure further comprise an adapter mounted to the first end of the tool electrode.
According to some embodiments of the first aspect of the present invention, the dc power source used for the tool electrode and the workpiece electrode is a pulsed dc power source.
the second aspect of the present invention also provides a machining method of the arc milling machining apparatus with rotating arc according to any one of the embodiments of the first aspect.
According to the second aspect of the invention, the processing method of the arc milling processing device of the rotating arc comprises the following steps:
Preparing: placing the workpiece electrode on a horizontal motion platform; longitudinally arranging the arc milling device of the rotating arc above the workpiece electrode, and enabling the second end of the tool electrode to face downwards;
Milling: and enabling the static longitudinal magnetic field generating device to generate a static longitudinal uniform magnetic field, supplying direct current to the tool electrode and the workpiece electrode, and continuously conveying high-pressure flushing liquid or high-pressure gas to the high-pressure flushing flow channel of the tool electrode, so that the high-pressure flushing liquid or the high-pressure gas flows out from the second end of the tool electrode to take away machining chips and heat in a machining area and perform effective interelectrode deionization.
According to the processing method of the arc milling device of the rotating arc, which is disclosed by the embodiment of the second aspect of the invention, the speed and the quality of milling are mainly improved, because the static longitudinal magnetic field generating device is arranged around the tool electrode, the additional longitudinal static magnetic field is uniformly distributed at the processing end of the tool electrode, the moving arc can be uniformly stressed, the Lorentz force is the maximum value, even if the tool electrode does not rotate, the Lorentz force can pull the arc to do high-speed spiral motion around the axis of the tool electrode, and materials can be continuously etched. In addition, the longitudinal static magnetic field can enable the electric arc to be homogenized and contracted, the electric arc form is effectively controlled, the electric arc discharge energy is more concentrated at the second end of the tool electrode, the rotating electric arc rotates stably at a machining position at a high speed, the workpiece electrode is continuously eroded, and the machining efficiency of arc milling of difficult-to-cut materials is improved. The high-pressure rush current channel can convey high-pressure liquid or high-pressure gas, the high-pressure liquid or the high-pressure gas can enter the high-pressure rush current channel from the first end and flow out from the second end to rush to the ongoing milling area, machining chips and heat in the machining area are quickly taken away, deionization can be effectively carried out, and continuous implementation of the discharge machining process is guaranteed. In summary, the arc milling device of the rotating arc according to the embodiment of the first aspect of the invention can work at high speed, has high efficiency and simple equipment, saves cost and is convenient for the reconstruction of a machine tool.
According to a further embodiment of the second aspect of the present invention, during the milling process, the method further comprises continuously delivering high-pressure flushing fluid or high-pressure gas to the processing region from the side surface between the tool electrode and the workpiece electrode by using the side surface auxiliary flushing device.
According to a further embodiment of the second aspect of the invention, the tool electrode is rotated during the milling process.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
Fig. 1 is a schematic structural diagram of a processing apparatus according to an embodiment of the present invention.
fig. 2 is a schematic diagram of a uniformly distributed static magnetic field generated by an electromagnetic coil of a processing apparatus according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the working principle of one embodiment of the present invention.
Reference numerals:
arc milling device 1000 for rotating arc
tool electrode 1
Workpiece electrode 2
Static longitudinal magnetic field generating device 3 DC power supply 31 electromagnetic coil 32
High-pressure flushing channel 4
side auxiliary flushing device 5
Adapter 6
Hollow DC motor 7
Horizontal motion platform 8
DC power supply 9
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A rotary arc milling apparatus 1000 according to an embodiment of the present invention is described below with reference to fig. 1 to 3.
as shown in fig. 1 to 3, a rotating arc milling device 1000 according to an embodiment of the first aspect of the present invention includes: the tool electrode 1 is provided with a first end and a second end, the tool electrode 1 is provided with a high-voltage rush current channel 4 which is communicated from the first end to the second end, the tool electrode 1 is used for machining a workpiece to be milled and machined as a workpiece electrode 2, and the tool electrode 1 and the workpiece electrode 2 are powered by a direct-current power supply 9; the static longitudinal magnetic field generating device 3 is arranged on the tool electrode 1 and used for generating a static longitudinal uniform magnetic field so that the second end of the tool electrode 1 performs arc milling on the workpiece electrode 2 by utilizing a rotating electric arc in the static longitudinal uniform magnetic field.
Specifically, the tool electrode 1 has a first end and a second end, the tool electrode 1 is provided with a high-pressure rush current channel 4 which penetrates from the first end to the second end, that is, the high-pressure rush current channel 4 is arranged inside the tool electrode 1 to form a hollow electrode, high-pressure liquid or high-pressure gas can be conveyed, the high-pressure liquid or the high-pressure gas and the like can enter the high-pressure rush current channel 4 from the first end and flow out from the second end to rush to an ongoing milling area, machining chips and heat can be taken away quickly, ionization can be eliminated effectively, and the continuous operation of an electric discharge machining process is ensured. The tool electrode 1 is used for machining a workpiece to be milled as a workpiece electrode 2, the workpiece electrode 2 can be a difficult-to-cut material in important fields such as aviation and aerospace, but not limited to the above, and the tool electrode 1 and the workpiece electrode 2 are connected to a direct current power supply 9 for machining the difficult-to-cut material. The speed of the electric arc milling can be greatly improved.
The static longitudinal magnetic field generating device 3 is arranged on the tool electrode 1 and is used for generating a static longitudinal uniform magnetic field so that the second end of the tool electrode 1 performs arc milling on the workpiece electrode 2 by utilizing a rotating arc in the static longitudinal uniform magnetic field. During milling, because the static longitudinal magnetic field device 3 forms a static magnetic field which is uniformly distributed around the tool electrode 1, when the arc moves in the uniformly distributed magnetic field, the lorentz forces generated by the charged particles moving along the cutting magnetic induction line are always equal and are the maximum values, and under the action of the lorentz forces, the charged particles can perform high-speed spiral motion around the axis of the tool electrode 1 even if the tool electrode 1 does not rotate, so that uniform arc discharge occurs on the annular surface which is closest to the tool electrode 1 and the workpiece electrode 2, and the workpiece electrode 2 in the discharge area is continuously eroded under the high temperature generated by the arc discharge group.
According to the arc milling device 1000 for the rotating arc of the first aspect of the present invention, the emphasis is on improving the speed and quality of the milling process, the static longitudinal magnetic field generating device 3 is disposed around the tool electrode 1, the applied longitudinal static magnetic field is uniformly distributed at the processing end of the tool electrode 1, the moving arc can be uniformly stressed, and the lorentz force is the maximum value, even if the tool electrode 1 is not rotated, the lorentz force can pull the arc to make a high-speed spiral motion around the axis of the tool electrode 1, and the material can be continuously removed. In addition, the longitudinal static magnetic field can enable the electric arc to be homogenized and contracted, the electric arc form is effectively controlled, the electric arc discharge energy is more concentrated at the second end of the tool electrode 1, the rotating electric arc rotates stably at a machining position at a high speed, the workpiece electrode 2 is continuously eroded, and the machining efficiency of arc milling machining of difficult-to-cut materials is improved. The high-pressure rush current channel 4 can convey high-pressure liquid or high-pressure gas, the high-pressure liquid or the high-pressure gas can enter the high-pressure rush current channel 4 from the first end and flow out from the second end, rush to the milling area in progress, quickly take away machining chips and heat in the machining area, and can effectively eliminate ionization, thereby ensuring the continuous progress of the electric discharge machining process. In summary, the arc milling device 1000 of the rotating arc according to the embodiment of the first aspect of the present invention can work at a high speed, has high efficiency, is simple in equipment, saves cost, and facilitates modification of a machine tool.
According to an embodiment of the first aspect of the present invention, the static longitudinal magnetic field generating means 3 is any one of a dc electromagnetic coil 32, a dc excitation means and a permanent magnet, and the tool electrode 1 is inserted into the dc electromagnetic coil 32, the dc excitation means or the permanent magnet.
That is, the static radial magnetic field generating device 3 can be a dc electromagnetic coil 32, the dc electromagnetic coil 32 is sleeved on the tool electrode 1, and after dc is applied, a uniformly distributed static longitudinal magnetic field is formed at the bottom of the second end of the tool electrode 1, and when the electric arc moves in the uniformly distributed magnetic field, lorentz forces generated by the charged particles moving along the cutting magnetic induction line are always equal and are the maximum values, and under the action of the Lorentz forces, even if the tool electrode 1 is not rotated, the charged particles make a high-speed spiral motion around the axis of the tool electrode 1, and therefore, uniform arc discharge occurs on the nearest annular surfaces of the tool electrode 1 and the workpiece electrode 2, the workpiece electrode 2 in the discharge area is continuously eroded under high temperature generated by the arc discharge group, therefore, the rotary arc milling process is continuously carried out, and the defect of low machining efficiency caused by the fact that materials are removed by intermittent discharge in the electric spark machining process is overcome. Meanwhile, the arc rotates, so the position of the electric discharge machining is changed at any time and the electric discharge is not continuously carried out at a certain point, therefore, the arc is pulsed at a certain point in the arc rotating process, and the phenomenon of workpiece burning at the point is avoided.
The static longitudinal magnetic field generating device 3 can also be a direct current excitation device, and the gravity flow electromagnetic excitation device can change the size of the generated static longitudinal uniform magnetic field because the size of direct current can be changed.
As can be seen from the formula of mv/qB, the larger the applied longitudinal static uniform magnetic field strength B is, the smaller the radius of the spiral motion of the charged particles is, so that the application of a longitudinal static magnetic field with appropriate strength can also effectively control the diffusion of the arc, so that the arc can be integrally contracted at the second end of the tool electrode 1, i.e., during the motion of high-speed rotation, the energy of the arc is more concentrated in the machining area, and the workpiece electrode 2 is stronger and has higher machining efficiency.
The static longitudinal magnetic field generating means 3 may also be a permanent magnet, in which case no additional power supply is required for the permanent magnet. According to one embodiment of the first aspect of the invention, the static longitudinal magnetic field generating means 3 is arranged on the tool electrode 1 so as to be longitudinally movable. The static longitudinal magnetic field can effectively control the diffusion of the electric arc, so that the electric arc can be integrally contracted when the processing end of the tool electrode 1 rotates at a high speed, and the longitudinal movement of the static longitudinal magnetic field generating device 3 can increase or reduce the processing range of the electric arc.
According to some embodiments of the first aspect of the present invention, a motor is further included, the motor being coupled to the tool electrode 1 for driving the tool electrode 1 in a rotational motion. Therefore, the tool electrode 1 can be in a rotary motion state during working, so that the arc rotation is guaranteed, the rotary arc is formed, the workpiece electrode 2 is milled by the rotary arc, and the efficiency is higher.
According to a further embodiment of the first aspect of the invention, the motor is an air-core dc motor 7. It will be appreciated that when the motor is a hollow dc motor 7, the shaft bore of the hollow dc motor 7 and the high pressure flushing passage 4 of the tool electrode 1 together serve as an internal flushing passage.
Of course, in other embodiments, the motor may be a non-hollow shaft motor, and the tool electrode 1 may be driven to rotate.
According to some embodiments of the first aspect of the present invention, further comprising a side auxiliary flushing device 5, the side auxiliary flushing device 5 is used for continuously supplying high-pressure flushing liquid or high-pressure gas to the machining area from the side between the tool electrode 1 and the workpiece electrode 2. It can be understood that, in the process of rotating arc milling, the side auxiliary flushing device 5 can convey high-pressure liquid or high-pressure gas, the high-pressure liquid or the high-pressure gas is continuously sprayed to the processing area from the side between the tool electrode 1 and the workpiece electrode 2 through the side auxiliary flushing device 5, and the high-pressure liquid or the high-pressure gas sprayed from the high-pressure flushing channel 4 is combined, so that machining chips and heat in the processing area can be taken away more quickly, ionization can be eliminated more effectively, the continuous proceeding of an electric discharge machining process is ensured, and the machining efficiency of moving arc milling of materials difficult to cut is improved.
According to some embodiments of the first aspect of the present invention, further comprising an adapter 6, the adapter 6 being mounted at a first end of the tool electrode 1. The tool electrode 1 can be connected to an external high-pressure flushing fluid or high-pressure gas system via an adapter 6.
Optionally, the adapter 6 may be a high-speed adapter. It can be understood that the tool electrode 1 is connected with external high-pressure flushing equipment or high-pressure gas equipment by using a high-speed adapter in a high-pressure flushing liquid or high-pressure gas high-speed flowing state, the sealing performance of the joint is good, and liquid or gas leakage can be avoided.
According to some embodiments of the first aspect of the present invention, the dc power supply 9 used for the tool electrode 1 and the workpiece electrode 2 is a pulsed dc power supply. Thus, when arc milling is performed by rotating an arc, the intensity of the arc can be changed by changing the pulse.
the second aspect of the present invention also provides a processing method of the arc milling processing apparatus 1000 of the rotating arc according to any one of the above embodiments.
As shown in fig. 1 to 3, the processing method of the arc milling processing apparatus 1000 of the rotating arc according to the embodiment of the second aspect of the present invention includes the following steps:
Preparing: placing the workpiece electrode 2 on a horizontal motion platform 8; the arc milling device 1000 of the rotating arc is longitudinally arranged above the workpiece electrode 2, and the second end of the tool electrode 1 faces downwards;
Milling: the static longitudinal magnetic field generating device 3 is enabled to generate a static longitudinal uniform magnetic field, direct current is supplied to the tool electrode 1 and the workpiece electrode 2, high-pressure flushing liquid or high-pressure gas is continuously conveyed into the high-pressure flushing flow channel 4 of the tool electrode 1, and the high-pressure flushing liquid or the high-pressure gas flows out from the second end of the tool electrode 1, so that machining chips and heat in a machining area are taken away, and effective interelectrode deionization is carried out.
Specifically, in the preparation step, the workpiece electrode 2 is placed on the horizontal moving platform 8, and during milling, the workpiece electrode 2 is driven by the horizontal moving platform 8 to move in the horizontal direction; the arc milling apparatus 1000 of rotating arc is disposed longitudinally above the workpiece electrode 2 with the second end of the tool electrode 1 facing downward, so as to mill the workpiece electrode 2 with the rotating arc.
In the milling step, as the static longitudinal magnetic field generating device 3 is arranged on the tool electrode 1, a static longitudinal uniform magnetic field can be generated so that the second end of the tool electrode 1 performs arc milling on the workpiece electrode 2 by using a rotating arc in the static longitudinal uniform magnetic field. During milling, because the static longitudinal magnetic field generating device 3 forms a static magnetic field which is uniformly distributed around the tool electrode 1, when the arc moves in the uniformly distributed magnetic field, the lorentz forces generated by the movement of the charged particles for cutting the magnetic induction lines are always equal and are the maximum values, and under the action of the lorentz forces, the charged particles can perform high-speed spiral motion around the axis of the tool electrode 1 even if the tool electrode 1 does not rotate, so that uniform arc discharge occurs on the annular surface which is closest to the tool electrode 1 and the workpiece electrode 2, and the workpiece electrode 2 in the discharge area is continuously eroded under the high temperature generated by the arc discharge group.
According to the processing method of the arc milling device 1000 for the rotating arc in the embodiment of the second aspect of the invention, the important point is that the speed and quality of milling are improved, because the static longitudinal magnetic field generating device 3 is arranged around the tool electrode 1, the additional longitudinal static magnetic field is uniformly distributed at the processing end of the tool electrode 1, the moving arc can be uniformly stressed, and the Lorentz force is the maximum value, even if the tool electrode 1 does not rotate, the Lorentz force can pull the arc to do high-speed spiral motion around the axis of the tool electrode 1, and materials can be continuously etched. In addition, the longitudinal static magnetic field can enable the electric arc to be homogenized and contracted, the electric arc form is effectively controlled, the electric arc discharge energy is more concentrated at the second end of the tool electrode 1, the rotating electric arc rotates stably at a machining position at a high speed, the workpiece electrode 2 is continuously eroded, and the machining efficiency of arc milling machining of difficult-to-cut materials is improved. The high-pressure rush current channel 4 can convey high-pressure liquid or high-pressure gas, the high-pressure liquid or the high-pressure gas can enter the high-pressure rush current channel 4 from the first end and flow out from the second end, rush to the milling area in progress, quickly take away machining chips and heat in the machining area, and can effectively eliminate ionization, thereby ensuring the continuous progress of the electric discharge machining process. In summary, the arc milling device 1000 of the rotating arc according to the embodiment of the first aspect of the present invention can work at a high speed, has high efficiency, is simple in equipment, saves cost, and facilitates modification of a machine tool.
According to a further embodiment of the second aspect of the present invention, during the milling process, the method further comprises continuously delivering high-pressure flushing liquid or high-pressure gas to the processing region from the side between the tool electrode 1 and the workpiece electrode 2 by using the side auxiliary flushing device 5. It can be understood that, in the process of rotating arc milling, the side auxiliary flushing device 5 can convey high-pressure liquid or high-pressure gas, the high-pressure liquid or the high-pressure gas is continuously sprayed to the processing area from the side between the tool electrode 1 and the workpiece electrode 2 through the side auxiliary flushing device 5, and the high-pressure liquid or the high-pressure gas sprayed from the high-pressure flushing channel 4 is combined, so that machining chips and heat in the processing area can be taken away more quickly, ionization can be eliminated more effectively, the continuous proceeding of an electric discharge machining process is ensured, and the machining efficiency of moving arc milling of materials difficult to cut is improved.
According to a further embodiment of the second aspect of the invention, the tool electrode 1 is set in a rotational movement during the milling process. Thus, the rotating arc rotates around the tool electrode 1 at a high speed, and the working efficiency is improved. For example, the tool electrode 1 can be driven by a motor to perform a rotational movement.
In the state where the tool electrode 1 is not rotated, the charged particles also make a high-speed spiral motion around the axis of the tool electrode 1.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (11)
1. An arc milling apparatus for rotating an arc, comprising:
The tool electrode is provided with a first end and a second end, the tool electrode is provided with a high-voltage rush current channel which penetrates from the first end to the second end, the tool electrode is used for machining a workpiece to be milled and machined, and the tool electrode and the workpiece electrode are powered by a direct-current power supply;
The static longitudinal magnetic field generating device is arranged on the tool electrode and used for generating a static longitudinal uniform magnetic field so that the second end of the tool electrode performs arc milling on the workpiece electrode by utilizing a rotating electric arc in the static longitudinal uniform magnetic field.
2. The arc milling device of the rotating arc according to claim 1, wherein the static longitudinal magnetic field generating device is any one of a dc electromagnetic coil, a dc excitation device and a permanent magnet, and the tool electrode is inserted into the dc electromagnetic coil, the dc excitation device or the permanent magnet.
3. The rotating arc milling machining apparatus according to claim 1 or 2, wherein the static longitudinal magnetic field generating means is provided on the tool electrode movably in a longitudinal direction.
4. The rotating arc milling apparatus according to claim 1 or 2, further comprising a motor connected to the tool electrode for driving the tool electrode in rotational motion.
5. the rotating arc milling apparatus according to claim 4, wherein the motor is a hollow motor.
6. The arc milling machining apparatus of a rotating arc according to claim 1 or 2, further comprising a side auxiliary flushing means for continuing a high-pressure flushing liquid or a high-pressure gas from a side between the tool electrode and the workpiece electrode to a machining region.
7. The rotating arc milling apparatus according to claim 1 or 2 further comprising an adapter mounted to said first end of said tool electrode.
8. The arc milling apparatus according to claim 1 or 2, wherein the dc power source used for the tool electrode and the workpiece electrode is a pulsed dc power source.
9. A machining method of an arc milling machining apparatus using a rotating arc according to any one of claims 1 to 8, comprising the steps of:
Preparing: placing the workpiece electrode on a horizontal motion platform; longitudinally arranging the arc milling device of the rotating arc above the workpiece electrode, and enabling the second end of the tool electrode to face downwards;
Milling: and enabling the static longitudinal magnetic field generating device to generate a static longitudinal uniform magnetic field, supplying direct current to the tool electrode and the workpiece electrode, and continuously conveying high-pressure flushing liquid or high-pressure gas to the high-pressure flushing flow channel of the tool electrode, so that the high-pressure flushing liquid or the high-pressure gas flows out from the second end of the tool electrode to take away machining chips and heat in a machining area and perform effective interelectrode deionization.
10. The machining method according to claim 9, characterized by further comprising continuously delivering high-pressure flushing liquid or high-pressure gas to a machining region from the side between the tool electrode and the workpiece electrode by using the side auxiliary flushing device during the milling machining.
11. A machining method according to claim 9, characterized in that the tool electrode is set in a rotational movement during the milling process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910860856.9A CN110576239A (en) | 2019-09-11 | 2019-09-11 | Arc milling device and method for rotating arc |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910860856.9A CN110576239A (en) | 2019-09-11 | 2019-09-11 | Arc milling device and method for rotating arc |
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