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CN-121972746-A - Bidirectional coaxial jet device and jet system for micro wire-cut electric discharge machining in gas

CN121972746ACN 121972746 ACN121972746 ACN 121972746ACN-121972746-A

Abstract

The invention provides a bidirectional coaxial jet device and a jet system for wire-cut electric discharge machining of a fine wire in gas, and belongs to the field of special machining. The influence of the lateral supply mode on the unbalance of the transverse stress of the electrode wire generated in the machining process, which causes the vibration aggravation and the unstable machining state of the electrode wire, is solved. The device comprises a plurality of resistive jet flow pore canals, a buffer cavity, a wire penetrating through hole, a diversion flow guide section, a liquid inlet transition flow passage and a jet flow outlet, wherein the liquid inlet transition flow passage is sequentially connected with the diversion flow guide section and the buffer cavity, the buffer cavity is connected with the jet flow outlet through the plurality of resistive jet flow pore canals, the diversion flow guide section uniformly diverges and guides media input from one side to two sides of the wire penetrating through hole to axially flow, the wire penetrating through hole and an electrode wire are coaxially arranged, and the electrode wire penetrates through the wire penetrating through hole. According to the invention, two jet devices are designed and controlled through the electromagnetic valve, and the two jet devices are in axisymmetric layout, so that flow velocity components in the horizontal direction are mutually offset, the medium is converged to the vertical direction coaxial with the electrode wire, and the processing area is stably covered.

Inventors

  • WANG YUKUI
  • DENG JIAYI
  • ZHAO YUANMING

Assignees

  • 哈尔滨工业大学

Dates

Publication Date
20260505
Application Date
20260324

Claims (9)

  1. 1. The bidirectional coaxial jet device for wire-cut electric spark in gas is characterized by comprising a plurality of resistive jet pore canals (1), a buffer cavity (2), a wire penetrating through hole (3), a diversion flow guide section (4), a liquid inlet transition flow passage (5) and a jet outlet (8); The utility model discloses a wire threading device, including feed liquor transition runner (5), buffer chamber (2), through a plurality of resistive jet flow pore (1), jet outlet (8) are connected to feed liquor transition runner (5), shunt diversion section (4), evenly branch and guide the medium of unilateral input to wire threading through-hole (3) both sides axial flow, wire threading through-hole (3) and wire electrode (33) coaxial arrangement, wire electrode (33) pass wire threading through-hole (3).
  2. 2. The in-gas micro wire-cut electric discharge bi-directional coaxial jet device according to claim 1, wherein the working medium enters the device from a liquid inlet transition flow channel (5), is divided into two paths by a diversion flow guide section (4) and flows into a buffer cavity (2), and is then ejected from a jet outlet (8) through a plurality of symmetrically distributed resistive jet pore canals (1).
  3. 3. The device of claim 1, wherein the coaxial jet device is made of high polymer or resin based material and is formed by 3D printing.
  4. 4. A jet system composed of the in-gas micro-wire-cut electric discharge bi-directional coaxial jet device according to any one of claims 1-3, characterized by comprising two in-gas micro-wire-cut electric discharge bi-directional coaxial jet devices and a control system, wherein electrode wires (33) respectively pass through the two in-gas micro-wire-cut electric discharge bi-directional coaxial jet devices which are arranged in an axisymmetric manner, and the two in-gas micro-wire-cut electric discharge bi-directional coaxial jet devices control jet directions through the control system.
  5. 5. The jet flow system composed of the micro wire-cut electric discharge machine in air according to claim 4, wherein the control system comprises an electromagnetic valve (17), one surface of the electromagnetic valve body is provided with an electromagnetic valve P port (9), an electromagnetic valve R port (10) and an electromagnetic valve S port (11), the opposite surface is provided with an electromagnetic valve A port (12) and an electromagnetic valve B port (13), the electromagnetic valve P port (9) is used as an air inlet and connected with a compressed air source, the electromagnetic valve R port (10) and the electromagnetic valve S port (11) are used as system exhaust ports, and the electromagnetic valve A port (12) and the electromagnetic valve B port (13) are used as air outlets and are respectively connected with air inlet threads (6) of the upper jet flow device and the lower jet flow device through air pipes.
  6. 6. The jet system composed of the in-gas micro-wire-cut electric discharge bi-directional coaxial jet device according to claim 5, wherein the two in-gas micro-wire-cut electric discharge bi-directional coaxial jet devices and the electromagnetic valve (17) are installed on the connecting plate (22), and the electromagnetic valve (17) is connected with the air inlet threads (6) of the two in-gas micro-wire-cut electric discharge bi-directional coaxial jet devices through the air pipe joint 24 connecting the air pipe 22.
  7. 7. The jet system composed of the in-gas micro-electro-spark wire-cutting bidirectional coaxial jet device is characterized in that the electromagnetic valve (17) comprises an electromagnetic valve left end electromagnet (26), an electromagnetic valve left working position (27), an electromagnetic valve middle working position (28), an electromagnetic valve right working position (29) and an electromagnetic valve right end electromagnet (30), and the electromagnetic valve left end electromagnet (26), the electromagnetic valve left working position (27), the electromagnetic valve middle working position (28), the electromagnetic valve right working position (29) and the electromagnetic valve right end electromagnet (30) are sequentially arranged from left to right.
  8. 8. The jet system composed of the micro wire electric discharge machine two-way coaxial jet device in air according to claim 7, wherein two travel switches are arranged at the wire winding drum position of the wire cutting machine, when the travel switch (25) at the left end of the wire winding drum is closed, the wire winding system starts to operate clockwise, meanwhile, the electromagnet (26) at the left end of the electromagnetic valve connected with the wire winding drum is electrified, the electromagnetic valve (17) is driven to switch to the working state of the left working position (27) of the electromagnetic valve, air source compressed air enters the upper jet device (19) at the moment, jet in the downward direction is realized, and similarly, when the travel switch (31) at the right end of the wire winding drum is closed, the electromagnet (30) at the right end of the electromagnetic valve is electrified, so that the electromagnetic valve (17) is switched to the working state of the right working position (29) of the electromagnetic valve, and the compressed air enters the lower jet device (20) to form jet in the upward direction.
  9. 9. A method of using a jet system comprising a wire cut electrical discharge machining bi-directional coaxial jet device in accordance with any one of claims 4-8, wherein: When the wire electrode runs clockwise, a wire winding cylinder left end travel switch (25) is triggered, an electromagnetic valve left end electromagnet (26) is electrified, an electromagnetic valve (17) is switched to a working state of an electromagnetic valve left working position (27), air source compressed air enters an upper jet device (19) through an air pipe through an electromagnetic valve P port (9) and an electromagnetic valve A port (12), and after being rectified through an internal flow passage of the air source compressed air, a medium forms downward stable coaxial jet and acts on a processing area; When the wire electrode runs anticlockwise, a travel switch (31) at the right end of the wire winding cylinder is triggered, the electromagnetic valve (17) is switched to a right working position (29) of the electromagnetic valve, compressed air enters a lower jet device (20) through a P port (9) and a B port (13) of the electromagnetic valve instead, and the medium forms upward stable coaxial jet to cover a processing area.

Description

Bidirectional coaxial jet device and jet system for micro wire-cut electric discharge machining in gas Technical Field The invention belongs to the field of special machining, and particularly relates to a bidirectional coaxial jet device and a jet system for wire-cut electric discharge machining in gas. Background The micro wire cut electrical discharge machining has the advantages of low cost, high precision, good reliability and the like in the aspect of machining microstructures, and is widely applied to the fields of machine manufacturing, aerospace, transportation and the like. In wire cut electrical discharge machining, a lateral flushing or air flushing is generally performed by using a nozzle in a working medium supply mode, and the mode easily causes unbalanced transverse stress of the wire electrode, so that vibration of the wire electrode is aggravated and the machining state is unstable. In the wire cut electric discharge machining, the wire electrode diameter is generally 20 to 50 μm, and the lateral medium supply mode has a more remarkable influence on the vibration of the wire electrode. In the conventional wire cut electric discharge machine and technique, there is no device for supplying a working medium coaxially with a wire electrode in both directions. Disclosure of Invention In view of the above, in order to solve the problem that the lateral feeding mode produces unbalanced transverse stress on the wire electrode in the machining process, so that the vibration of the wire electrode is aggravated and the machining state is unstable, the invention provides a bidirectional coaxial jet device and a jet system for micro wire electric discharge in gas, which are used for converging the flow direction of a fluid working medium to be coaxial with the wire electrode through the flow channel design, so that the negative influence of the lateral feeding mode on the machining process is avoided. In order to achieve the aim, the invention adopts the following technical scheme that the in-gas micro wire-cut electric discharge bi-directional coaxial jet device comprises a plurality of resistive jet pore canals, a buffer cavity, a wire penetrating through hole, a diversion flow guide section, a liquid inlet transition flow passage and a jet outlet; The liquid inlet transition flow passage is connected with the diversion flow guide section, the diversion flow guide section is connected with the buffer cavity, the buffer cavity is connected with the jet outlet through a plurality of resistive jet flow pore canals, the diversion flow guide section evenly diverges and guides a medium input from one side to axial flow at two sides of the wire penetrating through hole, the wire penetrating through hole and the electrode wire are coaxially arranged, and the electrode wire penetrates through the wire penetrating through hole. Furthermore, the working medium enters the device from the liquid inlet transition flow passage, is divided into two paths by the diversion flow guide section and flows into the buffer cavity, and is then ejected from the jet outlet through a plurality of symmetrical resistive jet pore canals. Furthermore, the coaxial jet device is preferably made of high-molecular polymer or resin-based materials and is integrally formed through a 3D printing technology. A jet system composed of two in-gas micro wire-cut two-way coaxial jet devices comprises two in-gas micro wire-cut two-way coaxial jet devices and a control system, wherein electrode wires respectively penetrate through the two in-gas micro wire-cut two-way coaxial jet devices which are arranged in an axisymmetric mode, and the two in-gas micro wire-cut two-way coaxial jet devices control jet directions through the control system. Furthermore, the control system comprises an electromagnetic valve, one surface of the electromagnetic valve body is provided with an electromagnetic valve P port, an electromagnetic valve R port and an electromagnetic valve S port, the opposite surface is provided with an electromagnetic valve A port and an electromagnetic valve B port, the electromagnetic valve P port is used as an air inlet and connected with a compressed air source, the electromagnetic valve R port and the electromagnetic valve S port are system air outlets, the electromagnetic valve A port and the electromagnetic valve B port are used as air outlets, and the electromagnetic valve A port and the electromagnetic valve B port are respectively connected with air inlet threads of an upper jet device and a lower jet device through air pipes. Furthermore, the two in-gas micro wire-cut electric discharge bidirectional coaxial jet devices and the electromagnetic valve are arranged on the connecting plate, and the electromagnetic valve is connected with an air pipe through an air pipe connector and is in threaded connection with air inlets of the two in-gas micro wire-cut electric discharge bidirectional coaxial jet devices. Still further, the sol