Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Auxiliary method and device for wire cut electrical discharge machining

A wire electric discharge and cutting technology, which is applied in the field of auxiliary methods and devices for wire electric discharge machining, can solve the problems of improper selection of vibration frequency and amplitude, reduced workpiece surface quality, reduced processing efficiency, etc., so as to reduce the negative impact. Small size, improved workpiece surface quality, and improved scour ability

Inactive Publication Date: 2017-07-21
HUAZHONG UNIV OF SCI & TECH
View PDF5 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although WEDM machining has high precision and the surface quality of the obtained workpiece is good, in order to obtain good surface quality, it is necessary to pay the price of processing efficiency and manufacturing cost; moreover, WEDM process is a severe thermal process. The heat energy generated instantly by the discharge pulse corrodes a certain volume of material, resulting in the melting, evaporation and ionization of the material at the pulse discharge point; some cracks, pits and recasting layers are inevitably generated on the surface of the workpiece, and the discharge is unstable. If the residue is not effectively washed away by the working fluid in time, the discharge channel will be shortened, resulting in reduced processing efficiency and reduced surface quality of the workpiece
Some scholars propose to apply vibration to the workpiece or the electrode wire to improve the scouring ability of the residue between the electrode wire and the workpiece, so as to improve the processing efficiency and surface quality. would have the opposite effect

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Auxiliary method and device for wire cut electrical discharge machining
  • Auxiliary method and device for wire cut electrical discharge machining
  • Auxiliary method and device for wire cut electrical discharge machining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Processing environment: the wire cutting machine is a high-performance 5-axis CNC slow-moving wire-cut electric discharge machine tool, and the metal workpiece to be processed is a difficult-to-machine material Ti6Al4V with a thickness of 10 mm;

[0033] The pulse width of the pulse current provided by the CNC slow-moving WEDM machine tool is 22μs, and the current is 5A; the slit is cut with a length of 5mm; the DC excitation power supply of the auxiliary device used has the function of current overvoltage and overtemperature protection, and the resolution is 10mA , can provide DC current 0-10A, voltage 0-30V, output power 300W; the electromagnet of the auxiliary device includes magnetic poles, yokes (including vertical yokes and cross yokes), wire bags and column sleeves, all of which are made of industrial pure iron The distance between the wire packs is 80mm, the diameter of the pole head of the electromagnet is 50mm, the distance between the two poles is adjustable w...

Embodiment 2

[0037] Processing environment: the wire cutting machine is a high-performance 5-axis CNC slow-moving wire-cut electric discharge machine tool, and the metal workpiece to be processed is a difficult-to-machine material Ti6Al4V with a thickness of 10 mm;

[0038] The pulse width of the pulse current provided by the CNC slow-moving WEDM machine tool is 22μs, and the current is 5A; the slit is cut with a length of 5mm; the DC excitation power supply of the auxiliary device used has the function of current overvoltage and overtemperature protection, and the resolution is 10mA , can provide DC current 0-10A, voltage 0-30V, output power 300W; the electromagnet of the auxiliary device includes magnetic poles, yokes (including vertical yokes and cross yokes), wire bags and column sleeves, all of which are made of industrial pure iron The distance between the wire packs is 80mm, the diameter of the pole head of the electromagnet is 50mm, the distance between the two poles is adjustable w...

Embodiment 3

[0042] The difference between the processing environment of embodiment 3 and embodiment 1 is: the magnetic pole spacing of the electromagnet is 40mm, the magnetic induction intensity of the magnetic field generated by the auxiliary device is 400mT by adjusting the output current of the DC excitation power supply to 10A, and the numerical control slow-moving wire electric spark The pulse width of the pulse current provided by the wire cutting machine is 22 μs, the current is 2A, and the others are the same as those in Embodiment 1.

[0043] After adopting the auxiliary device and method provided in this embodiment, the material removal rate is 0.083mm 3 / min, the surface roughness of the obtained workpiece is 0.52 μm; and without using the auxiliary device and method provided in this embodiment, the material removal rate is 0.017mm 3 / min, the surface roughness of the obtained workpiece is 0.58 μm; in contrast, the use of the auxiliary device and method provided by this embodim...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
material removal rateaaaaaaaaaa
surface roughnessaaaaaaaaaa
Login to View More

Abstract

The present invention discloses an auxiliary method and device for wire cut electrical discharge machining. The method comprises applying a magnetic field which is perpendicular to a machining direction and a wire electrode direction at the same time to a workpiece in a wire cut electrical discharge machining process. The device comprises a direct current excitation source and electromagnets. A discharge ion passage in wire cut electrical discharge machining is restricted and compressed through the applied magnetic field, and a lorentz force acting on the discharge ion passage and a lorentz force acting on a wire electrode are generated, so ion density of the discharge ion passage is raised, collision of charged ions in the discharge ion passage is intensified, discharge contact points of a working surface are increased, and a function of raising a material removal rate is achieved. Charged ion disturbances at surfaces of the electrodes are reduced through the magnetic field, stability of the discharge iron passage and discharge stability in wire cut electrical discharge machining are improved, and thus the surface quality of the manufactured workpieces is raised.

Description

technical field [0001] The invention belongs to the technical field of wire electric discharge machining for special processing, and more specifically relates to an auxiliary method and device for wire electric discharge machining. Background technique [0002] With the development of modern industry, the quality requirements of mechanical products are getting higher and higher. Traditional processing methods are difficult to meet the processing conditions of various ultra-precision, new materials with complex surfaces, and new structures. Special processing methods are required to process these material or structure to be processed. Special processing is characterized by non-mechanical contact, no macroscopic cutting force, but a processing method that uses non-mechanical energy (light, electricity, magnetism, heat, chemistry, etc.) to remove materials. [0003] Wire EDM is a special processing method that uses electric energy to process metal materials, and uses the conti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B23H7/02B23H7/36
CPCB23H7/02B23H7/36
Inventor 张臻张国军李文元黄禹黄浩张艳明陈志
Owner HUAZHONG UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products