Measures and methods to improve the surface quality of wire cutting workpieces
Release time:
2024-01-25
Author:
Source:
Beijing Ande Jianqi, a professional manufacturer of wire and wire cutting machines, provides professional and technical services to customers at home and abroad. Today, the author shares with you through the official website: ”Related issues affecting the processing of workpieces by cutting machines"
As a high-tech and high-precision processing equipment, EDM wire cutting machine is essential for its maintenance.The accuracy and surface quality of the processed workpiece directly depend on the accuracy of the bed.Therefore, the status of the machine tool must be checked before each processing to ensure that the processing conditions meet the requirements in order to obtain high-quality processing results.The following are the key links to pay attention to and corresponding improvement measures：
1. The surface quality of the electrode wire
Electrode wires exposed to air for a long time cannot be used to process high-precision parts, because if the surface of the electrode wire has been oxidized, it will affect the surface quality of the processed workpiece. Therefore, care should be taken not to damage the packaging film of the electrode wire when storing the electrode wire, so as not to oxidize the electrode wire in contact with the air. Before processing, the quality of the electrode wire must be checked.In addition, the tension of the electrode wire also has a great impact on the surface quality of the processed workpiece. For workpieces with high surface quality requirements, the tension of the electrode wire should be increased as much as possible under the premise of continuous wire.
2. The resistivity of the working fluid
Slow-moving wire cutting machines generally use deionized water as the working fluid.Spark discharge must be carried out in a liquid medium with certain insulating properties. The insulating properties of the working fluid can compress the discharge channel after breakdown, thereby limiting the spark discharge to a smaller channel radius, forming instantaneous and local high temperatures to melt and vaporize the metal, and quickly restore the discharge gap to an insulating state after the discharge is over.If the insulation performance is too low, electrolysis will occur and the breakdown spark discharge will not be formed; if the insulation performance is too high, the discharge gap will be small, chip removal will be difficult, and the cutting speed will be reduced.Generally, the resistivity should be 5×104～10×104Ω·cm. The display of the resistivity meter must be observed before processing. Especially when the machine tool is just started, it is often found that the resistivity is not within this range. Don't rush to process at this time. Let the machine run for a period of time to reach the required resistivity before starting formal processing.In order to ensure the machining accuracy, it is necessary to increase the resistivity of the processing fluid. When the resistivity of water is no longer increased, the ion exchange resin should be replaced.In addition, the conditions related to the coolant must be checked, the liquid volume of the processing fluid must be checked, and the filter pressure gauge should also be checked. The pressure value should be above 2.0×103Pa.When the processing fluid flows in reverse from the turbid cleaning tank, the filter needs to be replaced to ensure that the insulation properties, washing properties, and cooling properties of the processing fluid meet the requirements.
3. the wear of the conductive block
The wear of the conductive block must be checked.Slow-moving wire cutting machines generally have to consider changing the cutting position of the conductive block or replacing the conductive block after processing for 50~100h. When there is dirt, it needs to be cleaned with washing liquid.It must be noted that: when changing the position of the conductive block or replacing the conductive block, the verticality of the wire electrode must be recalibrated to ensure the accuracy and surface quality of the processed workpiece.
4. The health status of pulleys and related components
Check the rotation of the pulley. If the rotation is not good, it should be replaced. You must also carefully check the damage and dirt of the upper and lower nozzles, and use a cleaning solution to remove the dirt. If there is damage, it should be replaced in time.The condition of the wire in the wire storage cylinder should also be checked frequently. If it is too full, it will affect the smooth operation of the wire and affect the machining accuracy.In addition, the poor condition of the conductive block, pulley, and upper and lower nozzles will also cause the vibration of the wire electrode. At this time, even if the processed surface can be discharged well, the processed surface can easily produce peaks or stripes due to the vibration of the wire electrode, which eventually causes the surface roughness of the workpiece to deteriorate.
5. Maintain a stable power supply voltage
Unstable power supply voltage will cause instability at both ends of the electrode and the workpiece, which will cause instability in the breakdown and discharge process and affect the surface quality of the workpiece.
The above five points of content are related to the machine tool factors that may be involved in improving the surface quality of the processed workpiece. In the future articles, we will continue to analyze for you the last factor to improve the surface quality of the processed workpiece-the material factor.
For more articles on medium-wire and cutting machines, please visit Ande's official website, or call our national customer service hotline: 400-650-9707
Key words:
Next Page
Next page:
RELATED INFORMATION
Unit 01B, 25th Floor, Han's Plaza, No. 2 Ronghua Road South Road, Daxing district, Beijing, China
100176