TW201521919A - Line cutting multiple ignition discharge device - Google Patents

Abstract

Disclosed is a line cutting multiple ignition discharge device, comprising a working table, a polar unit, a low voltage ignition unit, a middle voltage ignition unit, a high voltage discharge unit, and a discharge control unit. The low voltage ignition unit provides a low voltage to perform ignition detection. The middle voltage ignition unit provides a middle voltage to perform ignition control. The high voltage discharge unit provides a high voltage to perform discharge processing. The discharge control unit controls the low voltage ignition unit to perform ignition detection and controls the middle voltage ignition unit to perform ignition detection when the ignition discharge channel is not established in case of exceeding an ignition allowed time, and controls the high voltage discharge unit to perform discharge processing after establishing the ignition discharge channel. It could effectively improve discharge times within an unit period to achieve the efficacy of promoting the processing speed.

Description

Wire cutting multiple ignition discharge device

The present invention relates to an ignition discharge device, and more particularly to a wire-cut multiple ignition discharge device.

Referring to FIG. 1, a conventional wire-cut ignition discharge device includes a corresponding table 11 and a line unit 12, a low-voltage ignition unit 13, and a high-voltage discharge unit 14.

The table 11 is for a workpiece 19 to be placed and electrically connected to the workpiece 19.

The low-voltage ignition unit 13 is electrically connected to the table 11 and the line unit 12 for providing a low-voltage voltage for ignition detection, and includes a low-voltage power supply connected in series between the table 11 and the line unit 12. LV, a switch SW1 and a current limiting element R.

The high voltage discharge unit 14 is electrically connected to the worktable 11 and the line unit 12 for providing a high voltage voltage for electrical discharge machining, and includes a high voltage power supply HV connected in series between the worktable 11 and the line unit 12. And a switch SW2.

Referring to FIG. 1 and FIG. 2, FIG. 2 shows an ignition discharge cycle of the wire-cut ignition discharge device, and the low-voltage point is turned on at the beginning of the cycle. The switch SW1 of the fire unit 13 causes the low-voltage ignition unit 13 to supply the low-voltage voltage between the workpiece 19 and the line unit 12 to establish an ignition discharge channel, which is moved by the table 11, and the residue is shaken after processing, or The line unit 12 vibrates to change the distance between the workpiece 19 and the line unit 12. After the distance between the workpiece 19 and the line unit 12 is reduced to a certain extent, the low voltage voltage can increase the degree of freeness of the electric field particles to form an electron beam path. As shown in FIG. 2, the voltage between the workpiece 19 and the line unit 12 drops rapidly, indicating that the ignition discharge channel is successfully established, and then the switch SW1 of the low-voltage ignition unit 13 is switched off, and the high-voltage discharge unit 14 is switched. The switch SW2 is turned on, so that the high voltage discharge unit 14 supplies the high voltage to the workpiece 19 and the line unit 12 for performing electrical discharge machining. After a period of processing, the switch SW2 of the high voltage discharge unit 14 is switched off to enter. The next ignition and discharge cycle.

However, in some cases, when the metal of the workpiece 19 is removed, the time T1 waiting for the low-voltage ignition unit 13 to establish the ignition discharge channel may be too long due to the increase in the distance between the line unit 12 and the workpiece 19, There is no processing capability during the time T1, so the number of electric discharge machining per unit time is reduced, and the processing speed cannot be effectively improved.

Accordingly, it is an object of the present invention to provide a wire-cut multiple ignition discharge device which can increase the number of electrical discharge machining operations.

Therefore, the wire-cutting multiple-ignition discharge device of the present invention is suitable for processing a workpiece, the wire-cutting multiple-ignition discharge device comprising: a work table for placing and electrically connecting the workpiece, and a pair of working table A line pole unit, a low voltage ignition unit, a medium voltage ignition unit, a high voltage discharge unit, and a discharge control unit.

The low-voltage ignition unit is electrically connected to the working platform and the line unit for providing a low-voltage voltage for ignition detection, and includes a low-voltage power supply, a switch and a series connected between the working table and the line unit. Current limiting component.

The medium voltage ignition unit is electrically connected to the working platform and the line unit respectively for providing a medium voltage voltage for ignition detection and comprising a medium voltage power supply and a switch connected in series between the working stage and the line unit. And a current limiting component, and the resistance of the current limiting component of the medium voltage ignition unit is greater than the resistance of the current limiting component of the low voltage ignition unit.

The high voltage discharge unit is electrically connected to the working table and the line unit respectively for providing a high voltage voltage for performing electrical discharge machining.

The discharge control unit is electrically connected to the low-voltage ignition unit, the medium-voltage ignition unit, and the high-voltage discharge unit, and controls the low-voltage ignition unit to perform ignition detection, and the low-voltage ignition unit is not detected after more than one ignition allowable time. When the ignition discharge channel is established, the medium voltage ignition unit is controlled to perform ignition detection, and after the ignition discharge channel is established, the high voltage discharge unit is controlled to perform electric discharge machining.

The effect of the invention is that: by setting the medium voltage ignition unit, and controlling the discharge control unit to exceed the ignition allowable time, the medium voltage ignition unit is provided with a higher voltage for ignition discharge, which can effectively increase the unit. The number of discharges in time can improve the processing speed.

2‧‧‧Workbench

3‧‧‧Line unit

4‧‧‧Low-voltage ignition unit

LPV‧‧‧Low-voltage power supply

Q1‧‧‧ switch

R1‧‧‧ current limiting components

5‧‧‧ medium voltage ignition unit

MPV‧‧‧ medium voltage power supply

Q2‧‧‧ switch

R2‧‧‧ current limiting component

6‧‧‧High voltage discharge unit

HPV‧‧‧High voltage power supply

Q3‧‧‧ switch

7‧‧‧Discharge Control Unit

9‧‧‧Workpiece

Other features and effects of the present invention will be apparent from the following description of the drawings. FIG. 1 is a schematic diagram of a conventional wire-cut ignition discharge device. FIG. 2 is a waveform diagram illustrating the conventional line. FIG. 3 is a schematic view showing a preferred embodiment of the wire-cut multiple ignition discharge device of the present invention; FIG. 4 is a waveform diagram illustrating a point of the preferred embodiment in a general case. The fire discharge period; and FIG. 5 is a waveform diagram illustrating an ignition discharge period of the preferred embodiment at an ignition allowable time.

Referring to Figure 3, a preferred embodiment of the wire-cut multiple ignition discharge device of the present invention is suitable for processing a workpiece 9 comprising: a work for placing and electrically connecting the workpiece 9 to the workpiece 9. The stage 2, a pair of line units 3, a low-voltage ignition unit 4, a medium-voltage ignition unit 5, a high-voltage discharge unit 6, and a discharge control unit 7 which are disposed on the table 2.

The low-voltage ignition unit 4 is electrically connected to the worktable 2 and the line unit 3 for providing a low-voltage voltage for ignition detection, and includes a low-voltage power supply connected in series between the worktable 2 and the line unit 3. LPV, a switch Q1 and a current limiting element R1.

The medium voltage ignition unit 5 is electrically connected to the work table 2 and the The line pole unit 3 is configured to provide a medium voltage voltage for ignition detection, and includes a medium voltage power source MPV, a switch Q2 and a current limiting component R2 connected in series between the working stage 2 and the line unit 3. The resistance of the current limiting element R2 of the medium voltage ignition unit 5 is greater than the resistance of the current limiting element R1 of the low voltage ignition unit 4.

In this embodiment, the low voltage voltage provided by the low voltage ignition unit 4 is DCV 80~100V, and the medium voltage voltage provided by the medium voltage ignition unit 5 is 1.2~1.4 times of the low voltage voltage, and the medium voltage ignition unit The resistance of the current limiting element R2 of 5 is 1.2 to 1.4 times the resistance of the current limiting element R1 of the low voltage ignition unit 4, and the ratio of the intermediate voltage to the resistance of the current limiting element R2 of the medium voltage ignition unit 5 is substantially The ratio is equal to the ratio of the low voltage voltage to the resistance of the current limiting element R1 of the low voltage ignition unit 4, but is not limited thereto.

The high voltage discharge unit 6 is electrically connected to the worktable 2 and the line unit 3 for providing a high voltage voltage for electrical discharge machining, and includes a high voltage power supply HPV connected in series between the worktable 2 and the line unit 3. And a switch Q3.

The discharge control unit 7 is electrically connected to the low-voltage ignition unit 4, the medium-voltage ignition unit 5, and the high-voltage discharge unit 6, and controls the low-voltage ignition unit 4 to perform ignition detection, and is still not detected after exceeding one ignition allowable time. When the low-voltage ignition unit 4 establishes an ignition discharge channel, the medium-voltage ignition unit 5 is controlled to perform ignition detection, and after the ignition discharge channel is established, the high-voltage discharge unit 6 is controlled to perform electric discharge machining.

In the present embodiment, the ignition allowable time is 10 to 15 μs, but may be set differently according to actual operation requirements, and is not limited thereto.

In this embodiment, the current limiting elements R1, R2 are resistors, and the switches Q1, Q2, and Q3 are bipolar junction transistors (BJTs), but are not limited thereto.

Referring to FIG. 3 and FIG. 4, FIG. 4 shows an ignition and discharge cycle in the general case of the embodiment. At the beginning of the cycle, the discharge control unit 7 first controls the switch Q1 of the low-voltage ignition unit 4 to be turned on. The low-voltage ignition unit 4 supplies the low-voltage voltage between the workpiece 9 and the line unit 3 to establish an ignition discharge channel, and the low-voltage voltage increases the degree of dissociation of the electric field particles between the workpiece 9 and the line unit 3 to form an electron. After the beam channel, the voltage between the workpiece 9 and the line unit 3 will drop rapidly, as shown in FIG. 4, at this time, indicating that the ignition discharge channel is successfully established, and then the discharge control unit 7 controls the low-voltage ignition unit 4. The switch Q1 is not turned on, and controls the switch Q3 of the high-voltage discharge unit 6 to be turned on, so that the high-voltage discharge unit 6 supplies the high-voltage voltage between the workpiece 9 and the line unit 3 for performing electric discharge machining. After processing for a period of time, the discharge is performed. The control unit 7 controls the switch Q3 of the high-voltage discharge unit 6 to be non-conducting to enter the next ignition-discharge cycle.

Referring to FIG. 3 and FIG. 5, FIG. 5 shows an ignition/discharge cycle of the present embodiment in excess of the ignition allowable time. At the beginning of the cycle, the discharge control unit 7 first controls the switch Q1 of the low-voltage ignition unit 4 to be turned on. Having the low voltage ignition unit 4 supply the low voltage voltage between the workpiece 9 and the line unit 3 to establish an ignition discharge path, when the ignition allowable time is exceeded and the ignition discharge channel is still not established (ie, the workpiece 9 is The voltage between the line pole units 3 is not lowered. The discharge control unit 7 controls the switch Q2 of the medium voltage ignition unit 5 to be turned on, so that the medium voltage ignition unit 5 supplies the medium voltage voltage. Between the workpiece 9 and the line unit 3, the voltage between the workpiece 9 and the line unit 3 is increased to speed up the establishment of the ignition discharge channel. After the ignition discharge channel is successfully established, the discharge control unit 7 controls The switch Q1 of the low-voltage ignition unit 4 and the switch Q2 of the medium-voltage ignition unit 5 are not turned on, and the switch Q3 of the high-voltage discharge unit 6 is controlled to be turned on for electric discharge machining, and after the processing for a period of time, the high-voltage discharge unit 6 is controlled. Switch Q3 is not conducting to enter the next ignition discharge cycle.

Through the above description, the advantages of the embodiment can be summarized as follows: 1. By setting the medium voltage ignition unit 5 and controlling the discharge control unit 7 to exceed the ignition allowable time, the medium voltage ignition unit 5 is enabled. Providing the medium voltage voltage higher than the low voltage to perform ignition discharge can speed up the establishment of the ignition discharge channel, reduce the waiting time for ignition, and avoid the discharge efficiency is lowered by waiting for the movement of the line unit 3 or the workpiece 9, so It can effectively increase the number of discharges per unit time and achieve the effect of increasing the processing speed. Under normal circumstances, as long as the waiting time does not exceed the ignition allowable time, the discharge control unit will not activate the medium voltage ignition unit, which can be reduced. The unnecessary consumption of energy is in line with the current trend of energy conservation.

2. By setting the current limiting components R1 and R2 respectively in the low voltage ignition unit 4 and the medium voltage ignition unit 5, suitable current limiting resistor values can be respectively designed according to the low voltage power source LPV and the medium voltage power source MPV, respectively. Limiting and reducing the output current of the low-voltage ignition unit 4 and the medium-voltage ignition unit 5, thereby avoiding excessive current and reducing power consumption, and achieving the most circuit The effect of Jiahua.

In summary, the present embodiment can not only effectively increase the number of discharges per unit time, but also achieve the effect of improving the processing speed, and can also achieve circuit optimization, so that the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

2‧‧‧Workbench

3‧‧‧Line unit

4‧‧‧Low-voltage ignition unit

LPV‧‧‧Low-voltage power supply

Q1‧‧‧ switch

R1‧‧‧ current limiting component

5‧‧‧ medium voltage ignition unit

MPV‧‧‧ medium voltage power supply

Q2‧‧‧ switch

R2‧‧‧ current limiting component

6‧‧‧High voltage discharge unit

HPV‧‧‧High voltage power supply

Q3‧‧‧ switch

7‧‧‧Discharge Control Unit

9‧‧‧Workpiece

Claims (6)

The utility model relates to a wire cutting multiple ignition discharge device, which is suitable for processing a workpiece. The wire cutting multiple ignition discharge device comprises: a work table for the workpiece to be placed and electrically connected to the workpiece; a line pole unit corresponding to the work table; a low-voltage ignition unit electrically connected to the working table and the line unit for providing a low-voltage voltage for ignition detection, and comprising a low-voltage power supply, a switch connected in series between the working table and the line unit a current limiting component; a medium voltage ignition unit electrically connected to the working stage and the line pole unit for providing a medium voltage voltage for ignition detection, and comprising a series connection between the working stage and the line pole unit a medium voltage power supply, a switch and a current limiting component, wherein a resistance of the current limiting component of the medium voltage ignition unit is greater than a resistance of the current limiting component of the low voltage ignition unit; and a high voltage discharge unit electrically connected to the working platform And the line pole unit for providing a high voltage voltage for performing electrical discharge machining; and a discharge control unit electrically connecting the low voltage ignition unit, the medium voltage ignition unit, and the high voltage discharge unit The unit controls the low-voltage ignition unit to perform ignition detection, and when the ignition-discharge time is not detected, the medium-voltage ignition unit is controlled to perform ignition detection, and the ignition discharge channel is After the establishment, the high voltage discharge unit is controlled to perform electrical discharge machining. The wire-cut multiple-ignition discharge device of claim 1, wherein the medium-voltage voltage is 1.2 to 1.4 times the low-voltage voltage, and the medium-voltage ignition single The resistance of the current limiting component of the element is 1.2 to 1.4 times the resistance of the current limiting component of the low voltage ignition unit. The wire-cut multiple-ignition discharge device of claim 2, wherein a ratio of the intermediate voltage to a current-limiting element resistance of the medium-voltage ignition unit is substantially equal to the low-voltage voltage and a current limit of the low-voltage ignition unit The ratio of the resistance of the component. The wire-cut multiple-ignition discharge device of claim 3, wherein the high-voltage discharge unit comprises a high-voltage power supply and a switch connected in series between the workbench and the line unit. The wire-cut multiple ignition discharge device of claim 4, wherein the current limiting elements are resistors. The wire-cut multiple-ignition discharge device of claim 5, wherein the switches are bipolar transistors.