Surface morphology characteristics of WEDM

Dalian fast and slow wire cutting processing and sand blasting derusting is to use compressed air to spray sand blasting abrasive with a certain particle size on the surface of workpiece with rust layer through sand blasting machine, and realize the removal of rust layer, oxide and oil stain through the impact force and grinding force of sand, so as to prepare the surface for coating, spraying, electroplating and other processes. After sand blasting and rust removal, the workpiece can receive a certain degree of cleanliness, achieve a certain degree of roughness, improve the adhesion between the workpiece and the coating, and prolong the service life of the coating and workpiece.

After the steel materials enter the factory, the raw materials of the steel shall be treated before processing to remove the scale and rust on the surface. After reaching the rust removal standard, the steel shall be coated with temporary protective primer to ensure that the steel will not continue to be corroded in the process of processing and manufacturing components. This stage of steel plate treatment is called steel surface pretreatment, which has the advantages of convenient construction, ensuring coating quality, saving manpower and financial resources Shorten the construction period of later coating works.

The research of Dalian fast and slow WEDM shows that the surface morphology of WEDM has obvious fractal characteristics in a certain scale range. The setting of machining parameters and the performance of pulse power supply affect the size of fractal dimension D. fractal dimension D has a certain corresponding relationship with surface roughness Ra. It is more reasonable to combine fractal dimension D and surface roughness Ra to describe the morphological characteristics of WEDM surface.

According to different materials, the polishing machine is also divided into many types, such as magnetic polishing machine, blade polishing machine, portable polishing machine, etc. the important thing of the polishing machine is its performance and characteristics, which can make different patterns on different materials; The key setting of the grinder in operation is to need a large polishing rate. How can we choose a high-quality grinder when we choose? Let's take a look at this grinder. Whether the installation tightness of molybdenum wire is appropriate. If the molybdenum wire is installed too loosely, the molybdenum wire jitters severely, which will not only cause wire breakage, but also directly affect the surface roughness of the workpiece due to the jitter of the molybdenum wire. However, the molybdenum wire cannot be installed too tightly. If it is too tight, the internal stress will increase and the wire will be broken. Generally speaking, the newly installed molybdenum wire should be tightened before processing.

Dalian fast and slow WEDM in order to carry out EDM smoothly, conditions must be created to ensure that spark discharge rather than arc discharge is generated between electrode wire and workpiece during each electric pulse. First, there must be sufficient interval between the two electric pulses to eliminate the ionization of the medium in the discharge gap. Even if the charged particles in the discharge channel are compounded into neutral particles, the insulation strength of the medium in the gap at the discharge channel shall be restored, so as to avoid electric arc discharge caused by always discharging at the same place. Generally, the pulse interval shall be more than 4 times of the pulse width.