Wire cutting high frequency pulse width pulse how to set up

The pulse power supply for EDM is the pulse generator, which converts the ordinary 50h2 alternating current into a one-way pulse current with a high frequency, so that the electrode gap produces an electric spark discharge to ablate the metal. The pulse power supply has a great influence on the technical and economic indicators such as the processing speed, surface quality, stability of the machining process and the loss of the tool electrode in EDM. The pulse power supply parameters include current peak, pulse width, pulse interval, no-load voltage, discharge current, and the selection of pulse parameters for fast wire cutting is shown in Table 6-1, and the selection of pulse parameters for fast wire cutting is shown in Table 6-2.

1 Current peak.

The peak current refers to the instantaneous maximum value of the discharge current when the short circuit is not changed, when other parameters remain unchanged, the peak current increases, the cutting speed increases significantly, but the surface quality will deteriorate, and the loss of the electrode wire will increase or even break the wire.

Table 6-1 Selection of pulse parameters for fast-walking wire cutting processing.

Application: Current Peak IC A Pulse Width, Ti S, Pulse Interval, T0 S, No-Load Voltage.

For fast cutting or thicker workpieces, ra is greater than 12 20 40 In order to achieve stable machining, T0 Ti = 3 4 is generally 70 90

Semi-finishing ra= 6 12 6 20

Finishing ra below 2 6

2 pulse width.

Pulse width refers to the duration of the pulse current, when other parameters remain unchanged, the pulse width increases, the cutting speed is significantly accelerated, the electrocorrosive matter increases, and it is too late to discharge, resulting in the instability of the cutting process, but the cutting speed decreases, the surface quality deteriorates, and the loss of the electrode wire increases or even breaks the wire. The test shows that changing the pulse width is not as important as changing the current peak, which has a significant effect on the cutting speed.

3 pulse intervals.

Pulse interval refers to the time between two consecutive pulses, which directly affects the average current, when other parameters remain unchanged, the pulse interval decreases by the same as increasing the number of discharges per unit time, the average current increases, the cutting speed accelerates, but the pulse interval is too small, which will cause arc discharge and wire breakage.

The control parameters in wire cutting processing include pulse gap, pulse width, voltage, average processing current, cutting speed, electrode wire tension, electrode wire diameter, type of working fluid and pollution degree.

Workpiece thickness 10 30 60 100 150 200 duty cycle 1:2 1:3 1:

Workpiece thickness mm 20 50 100 100 small pulse width (ti) 4 8 12 12

ti/to 1：1 1：1~2 1：

2 3 1:3 6 Note: For workpieces above 100mm, the use of grouped pulses should be carefully adjusted, otherwise it is easy to break wires.

For the cutting of high-thickness workpieces, attention should be paid to the adjustment of duty cycle, which is easy to break when it is small.

Summary. Pro, the lower the laser frequency, the stronger the single pulse energy, the faster the cutting speed, the smaller the incision, the higher the laser frequency, the lower the single pulse energy, the slower the cutting speed, and the larger the incision.

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Pro, the lower the laser frequency, the stronger the single-pulse service, the faster the cutting speed, the smaller the incision, the higher the laser negotiation frequency, the lower the single-pulse energy, the slower the cutting speed, and the larger the incision.

The lower the laser frequency, the stronger the single pulse energy, the faster the cutting speed, and the smaller the incision, and vice versa.

1. Selection of all pulse widths.

Operation method: Rotate the "pulse width selection" knob to select 8 s 80 s pulse width, divided into five gears, which are 8 s for 1 gear, 20 s for 2 seconds, 40 s for 3 gear, 60 s for 4 seconds, and 80 s for 5 gear

The selection principle is explained: when the pulse width is wide, the discharge time is long, the energy of a single pulse is large, the processing is stable, and the cutting efficiency is high, but the surface roughness is poor. On the contrary, when the pulse width is narrow, the energy of a single pulse is small, the processing stability is poor, the cutting efficiency is low, but the surface roughness is better.

In general:

For workpieces with a height of less than 15mm, the pulse width is selected as 1 5 gears;

For workpieces with a height of 15mm and 50mm, the pulse width is selected from 2 to 5 gears;

For workpieces with a height of more than 50mm, the pulse width is selected from 3 to 5 gears.

Selection of pulse intervals.

Operation method: Rotate the "Interval Fine-tuning" knob to adjust the size of the pulse interval width, the clockwise rotation interval width becomes larger, and the counterclockwise rotation interval width becomes smaller.

Explanation of selection principle: when the height of the workpiece is high, the pulse interval should be increased appropriately to facilitate chip removal, reduce the generation of electrocorrosive dirt at the cutting place, make the processing more stable, and prevent wire breakage. Because in the case of the determination of the pulse width level, the interval is determined by the "interval fine-tuning" knob, and the interval width is fixed, so to adjust the interval size is to rotate the "interval fine-tuning" knob.

When the Interval Trimmer knob is rotated in the presence of a stable high-frequency current indication, a decrease in current indicates a larger interval, and a higher current indicates a smaller interval.

Workpiece thickness (mm).

Processing voltage (v).

Electrical current (a).

Pulse width gear (gear) and interval fine-tuning (position).

Pulse amplitude (level).

1-5 middle.

2-5 middle.

3-5 middle.

The 3-5 interval becomes larger.

The 3-5 interval becomes larger.

The 3-5 interval becomes larger.

3-5 interval becomes larger11