The accuracy that can be achieved by precision machining is one of the important indicators of a country's manufacturing technology level, and with the continuous improvement in machining accuracy, the requirements of the environment around the machine tool are becoming increasingly demanding. In addition to the fluctuations in hydraulic and pneumatic pressure in precision machining, the temperature, cleanliness and vibration of the working environment also have a great impact on the quality of machining. In order to improve the accuracy of the machined surface of precision machine parts, multiple cutting technology has emerged. 

Multiple cutting technology, EDM wire cutting to improve the precision and surface quality of precision mechanical parts of the fundamental means, generally through the first cut forming, the second cut to improve the accuracy, the third cut to improve the surface quality. 

Multiple cutting process, the first cut needs to use a large pulse energy to obtain a higher cutting speed, when the quality of precision mechanical parts processing surface for multiple cutting process, which first requires the machine table must have a high geometric accuracy and accuracy of movement, followed by the requirements of the wire walking system must ensure that the electrode wire in the space position of the constant and stable. Of course, in order to achieve the purpose of stable multiple cutting, it is also necessary to improve the high frequency pulse power supply and the multiple cutting process and other systematic research. The accuracy of the table's movement is such that multiple cuts can be made along a repeated offset trajectory, which is a guarantee of increased precision and improved surface quality of precision mechanical parts. The electrode wire has a certain rigidity, after passing through the positioning guide wheel actually appears arc-shaped, it is deviated from the upper and lower guide wheel tangent line, the size of the deviation will change with the change of the electrode wire tension. 

In the actual processing of precision mechanical parts, the wire tension is in an unstable state, so the wire walking system must control the wire tension. At the same time, when the electrode wire is positioned using the guide wheel, the semi-open positioning of the guide wheel makes the wire positioned differently in all directions during cutting due to the action of the discharge explosion force. A higher first cutting speed is a prerequisite for the practicalisation of multiple cutting. The average cutting speed and surface quality of multiple cutting are comparable to the results of the first cutting by reducing the discharge energy, although corrections to the machining accuracy of precision mechanical parts can be made by multiple cutting. However, multiple cutting requires higher quality of equipment and personnel, and the risk is greater, which can easily result in broken wires due to increased discharge energy during the first cut, or scrapping of the workpiece due to unstable cutting conditions during multiple cutting. Practice has shown that when cutting with a compound working fluid containing less oil, there is a great improvement in the stability of the process, the ability to cut thicker, the chance of wire breakage and the surface finish.

The accuracy that can be achieved by precision machining is one of the important indicators of a country's manufacturing technology level, and with the continuous improvement in machining accuracy, the requirements of the environment around the machine tool are becoming increasingly demanding. In addition to the fluctuations in hydraulic and pneumatic pressure in precision machining, the temperature, cleanliness and vibration of the working environment also have a great impact on the quality of machining. In order to improve the accuracy of the machined surface of precision machine parts, multiple cutting technology has emerged. 

Multiple cutting technology, EDM wire cutting to improve the precision and surface quality of precision mechanical parts of the fundamental means, generally through the first cut forming, the second cut to improve the accuracy, the third cut to improve the surface quality. 

Multiple cutting process, the first cut needs to use a large pulse energy to obtain a higher cutting speed, when the quality of precision mechanical parts processing surface for multiple cutting process, which first requires the machine table must have a high geometric accuracy and accuracy of movement, followed by the requirements of the wire walking system must ensure that the electrode wire in the space position of the constant and stable. Of course, in order to achieve the purpose of stable multiple cutting, it is also necessary to improve the high frequency pulse power supply and the multiple cutting process and other systematic research. The accuracy of the table's movement is such that multiple cuts can be made along a repeated offset trajectory, which is a guarantee of increased precision and improved surface quality of precision mechanical parts. The electrode wire has a certain rigidity, after passing through the positioning guide wheel actually appears arc-shaped, it is deviated from the upper and lower guide wheel tangent line, the size of the deviation will change with the change of the electrode wire tension. 

In the actual processing of precision mechanical parts, the wire tension is in an unstable state, so the wire walking system must control the wire tension. At the same time, when the electrode wire is positioned using the guide wheel, the semi-open positioning of the guide wheel makes the wire positioned differently in all directions during cutting due to the action of the discharge explosion force. A higher first cutting speed is a prerequisite for the practicalisation of multiple cutting. The average cutting speed and surface quality of multiple cutting are comparable to the results of the first cutting by reducing the discharge energy, although corrections to the machining accuracy of precision mechanical parts can be made by multiple cutting. However, multiple cutting requires higher quality of equipment and personnel, and the risk is greater, which can easily result in broken wires due to increased discharge energy during the first cut, or scrapping of the workpiece due to unstable cutting conditions during multiple cutting. Practice has shown that when cutting with a compound working fluid containing less oil, there is a great improvement in the stability of the process, the ability to cut thicker, the chance of wire breakage and the surface finish.