EDM technology is a kind of special processing. It is different from the traditional processing technology that requires the removal of mechanical and mechanical energy. It mainly uses electrical energy to realize the processing of materials. Therefore, the WEDM technology is not limited by the material properties and can process any material with hardness, strength, and brittleness, which occupies an important position in the machining process at this stage.
Wire cutting machine classification
EDM cutting machine can be divided into low-speed one-way walking wire EDM machine (commonly known as "slow walking wire"), high-speed reciprocating wire EDM wire-cutting machine (commonly known as "fast walking wire") and vertical type. Rotary wire EDM three types.

 

Slow walking

The cutting speed of the slow-cut wire cutting machine is generally 0.2m/s, and the precision is 0.001mm. Copper wire is usually used as the electrode wire. The electrode wire is used for low-speed one-way movement, and the machining surface quality is close to the grinding level. The work is smooth, uniform, with small jitter, good processing quality, and high production efficiency, up to 350/min.

Fast wire

Quick-wire cutting machine (wire-feeding EDM machine tool) Electrode wire is generally made of molybdenum wire, the general processing speed of up to 6 ~ 12m / s. Since the electrode wire is reciprocated during processing, the machine tool cannot apply constant tension control to the electrode wire. Therefore, the wire electrode jitter may occur, resulting in broken wires. At the same time, reciprocating wire drawing makes the wire loss after many uses, and the machining accuracy and the surface quality of the workpiece will decrease.
In the category of wire-cutting wire-cutting machine tool, it is a reciprocating high-speed wire-wound wire EDM machine tool category. It is a high-speed reciprocating wire-wound wire EDM machine that realizes multiple cutting functions. The so-called "take-up wire" is not the speed of wire-spinning, but it refers to the wire-wound wire electric discharge machine that draws lessons from the processing technology of some low-speed wire-drawing machines and realizes unstriped cutting and multiple cutting.
 
 

Vertical rotary electric discharge wire cutting machine

The vertical rotary electric discharge machine has more than one rotary motion around its axis with respect to the above two kinds of machine tools. Its processing speed is 1~2m/s. Due to the existence of the rotary motion, a series of beneficial process effects are produced in the machining process, such as uniform wear of the electrode wire and prolonged life of the wire; the smoothness of the electrode wire movement is significantly improved, and the wire breakage rate is reduced; the rotary motion can make The smaller tensioning force increases the machining accuracy.
Process characteristics
Wire cutting technology mainly has the following characteristics:
1. There is no significant mechanical chip force in the processing. Regardless of the hardness and rigidity of the workpiece, it can be processed as long as it is conductive or semi-conductive material. However, non-metallic conductive materials cannot be processed.
 
2. Small holes and complex shaped parts can be machined but blind holes cannot be machined.
 
3, the electrode wire loss is small, high precision machining.
 
4. The narrow kerfs produced during processing will reduce the amount of metal removal, which is beneficial to the reuse of materials.
 
5, when the workpiece material is too thick, the working fluid is difficult to enter and fill the discharge gap, will affect the processing accuracy and surface roughness.
 
6, the process may appear in the workpiece surface cracks, deformation and other issues, processing should be appropriate heat treatment and roughing, eliminating the material properties and blank shape defects, improve processing accuracy.
 
 7, through the NC programming technology to process the workpiece, the processing parameters can be adjusted, easy to achieve automatic processing.
 

Application area

CNC wire-cutting machine tooling solves many difficult problems that traditional machining can't solve, especially in the processing of products such as small-angle, taper-cutting and other products. It has been widely used in the automotive, machine tool production, aerospace and other industrial fields.
Wire cutting technology can achieve high-precision machining through reasonable optimization of machining parameters and error compensation, occupying an important position in the field of machining. The use of new technologies, new processes to promote the rapid development of CNC wire EDM technology, increase investment in wire cutting technology, thus promoting the development of the entire mechanical processing industry.