Selection of parameters of high frequency power supply for wire cutting
1. Selection of wire cutting working voltage: turn the "voltage regulation" knob to select the processing voltage of 70 ~ 110V, which is divided into three levels. The value displayed by the voltmeter is the processing voltage value.
For the workpiece with height less than 50mm, the processing voltage is 70V, which is the first gear;
For the workpiece with a height of 50mm ~ 150mm, the processing voltage is 90V, which is the second gear;
For the workpiece with a height of more than 150mm, the processing voltage is 110V, which is the third gear.
2. Selection of working current of wire cutting high frequency power supply: changing the "pulse amplitude" switch, adjusting the "pulse width selection" and "interval fine adjustment" knobs can change the working current. The selection of working current here refers to the adjustment of pulse amplitude switch.
By changing the on-off state of the five switches of "pulse amplitude", 12 levels of power output can be realized, and the output current can be flexibly adjusted to ensure the average processing current required under various process requirements. For example, if two switches marked 2 are open, it is equal to one switch marked 1 and 3 is open; Other similar.
The more the "pulse amplitude" switch is turned on (equivalent to the more power amplifier tubes selected), the greater the processing current is, the faster the processing speed is. However, under the same pulse width, the greater the processing current is, the rougher the surface is, and the worse the surface degree is. Generally speaking, for workpieces with a height less than 50mm, the pulse amplitude switch shall be opened in 1 ~ 5 gears, such as 1, 2, 3 or 1 + 2, 1 + 3 or 2 + 2, 1 + 2 + 2 or 2 + 3.
For the workpiece with a height of 50mm ~ 150mm, the pulse amplitude opening times are 3 ~ 9 times, such as 3 or 1 + 2, 2 + 2 or 3 + 1, 2 + 3 or 1 + 2 + 2, 3 + 3, 2 + 2 + 3 or 3 + 3 + 1, 3 + 3 + 2 or 3 + 2 + 2 + 1.
For the workpiece with a height of 150 mm ~ 300 mm, the number of pulse amplitude switching is 6 ~ 11 times, such as 3 + 3, 2 + 2 + 3 or 3 + 3 + 1, 3 + 3 + 2 or 3 + 2 + 1, 3 + 3 + 2 + 1, 3 + 3 + 2 + 2, 3 + 3 + 2 + 1.
3. Wire cutting high frequency power pulse width selection: rotate the "pulse width selection" knob to select 8 μ s~80 μ S pulse width, divided into five stages, the first stage is 8 μ s. Second stage 20 μ s. Third level 40 μ s. Level 4 60 μ s. And level five. Gear 80 μ s。 When the pulse width is wide, the discharge time is long, the single pulse energy is large, the machining is stable, the cutting efficiency is high, but the surface roughness is poor. On the contrary, when the pulse width is narrow, the single pulse energy is small, the machining stability is poor, the cutting efficiency is low, but the surface roughness is good.
Generally speaking: for workpieces with height less than 15mm, select 1 ~ 5 pulse width;
For workpieces with a height of 15mm ~ 50mm, select 2 ~ 5 pulse width;
For workpieces with a height of more than 50mm, select 3 to 5 pulse widths.
4. Selection of pulse interval of wire cutting high frequency power supply: rotate the "interval fine adjustment" knob to adjust the pulse interval width. Turn clockwise to increase the interval width and counterclockwise to reduce the interval width.
When the workpiece height is high, the pulse interval shall be appropriately increased to facilitate chip removal, reduce the generation of electric corrosion dirt at the cutting position, make the processing more stable and prevent wire breakage. When determining the pulse width gear, the interval is determined by the "interval fine adjustment" knob, and the interval width is fixed, so adjusting the interval is to turn the "interval fine adjustment" knob. When there is a stable high-frequency current indication, when turning the "interval fine adjustment" knob, the smaller the current, the larger the interval, and the larger the current, the smaller the interval.