How to adjust the machining speed of wire cutting

In WEDM, the machining speed is often used as the evaluation index of machining efficiency, which can be expressed as the sum of the area of the center line of electrode wire passing through the workpiece in unit time. The main factors affecting the machining speed of WEDM are: machining process parameters, workpiece material, cutting fluid concentration and flow, machining process route and ambient temperature. How to adjust the processing speed of Dalian fast and slow wire cutting?

1. The molybdenum wire is thicker, the pulse width is larger, and the frequency conversion tracking is tighter.

2. There is a rotary switch on the controller, which rotates slowly to the left and fast to the right.

3. Generally, if there is no such rotary switch in China, it is necessary to adjust various parameters. The wire cutting fluid will lose its ionization effect after a long time.

4. The guide roller bearing shall also be inspected and maintained daily. This speed can also be raised when the machine is normal.

The wire speed of slow wire EDM is 0.2mm/s, and the electrode wire makes low-speed unidirectional movement, with high cutting accuracy. The wire speed of fast wire EDM is 6 ~ 12 mm / s, the electrode wire moves back and forth at high speed, and the cutting accuracy is poor.

Physical principle of wire cutting:

1. Free positive ions and electrons accumulate in the field and soon form an ionized conductive channel. At this stage, a current is formed between the two plates. As a result, the particles collided countless times to form a plasma region, which soon rose to a high temperature of 8000 to 12000 degrees, and some materials were instantly melted on the surfaces of the two conductors.

2. At the same time, due to the vaporization of the electrode and dielectric liquid, a bubble is formed, and its pressure rises regularly until it is very high. Then the current is interrupted and the temperature suddenly decreases, causing the bubble to explode inward. The generated power throws the dissolved material out of the crater, and then the corroded material recondenses into small spheres in the dielectric liquid and is discharged by the dielectric liquid.

3. Through the monitoring and control of NC control, the servo mechanism executes to make this discharge phenomenon uniform.

The chip removal effect of wire cutting machine tool is also an important factor affecting the machining finish. After the machining speed is fast, if the quality and drainage effect of cutting fluid can not keep up, it will lead to carbon deposition, resulting in coarse and serious particles on the cutting surface, and even slightly concave convex stripes.