CN2194781Y

CN2194781Y - Power supply for wire cutting machine

Info

Publication number: CN2194781Y
Application number: CN 94242218
Authority: CN
Inventors: 王星群
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-07-15
Filing date: 1994-07-15
Publication date: 1995-04-19
Anticipated expiration: 2004-07-15

Abstract

The utility model relates to a power supply for wire cutting machines, comprising a pulse waveform generator, a DC working power supply, power triode circuits, etc. The utility model is characterized in that a high and low voltage composite circuit is adopted, namely a low and high voltage working voltage is connected to a gap by the output loops of a first power triode circuit and a second power triode circuit; the output of the pulse waveform generator is connected with the input control terminal of the first power triode circuit; the output loop of the pulse waveform generator is connected with a working power supply which is higher than the electrical discharge property; the input terminal of the second power triode is connected with a constant voltage source; the voltage of the constant voltage source uses the gap as the reference point of voltage; the output terminal loop of the constant voltage source is connected with a high voltage DC power supply, and the current of the output loop is limited by the triodes to replace a power resistor.

Description

Power supply for wire cutting machine

The utility model relates to wire cutting machine tool power supply and manufacturing.

Have away silk cutting machine tool now and all need use the adapted power supply, it is applied to conduct erosion complementary energy between molybdenum filament and the work, and the high frequency electric source of state's inner height wire cutting off machine uses the control impuls on-off circuit, by the on off state of oscillating impulse gauge tap triode; When the triode conducting state, dc source is applied between molybdenum filament and the workpiece, add power resistor control electric current, general constantly open-minded under the control of impulse generator by many groups switch element, pulse width and also adjustable by the impulse generator generation at interval, the size of transporting to the pulse current of discharging gap is determined by the number of switching tube and the electric current of every pipe, the operating voltage that the electric current that every pipe passes through is provided by dc source and the decisions such as resistance of power resistor, during the processing discharge, gap voltage has only 20-30V(to be determined by flash-over characteristic).The remainder of the 70-100V voltage that dc source provides just all consumes on power resistor, their actual consumptions the energy of 70-80%, thereby the volume of existing high frequency electric source is big, cost height (because input power is big), internal calorific power is big, efficient is low.

The utility model purpose is that making is a kind of energy-conservation, and efficient is high also to be the low line merit cutting mill bed power supply of cost simultaneously.

The technical solution of the utility model is: a kind of line cutting mill bed power supply, comprise pulse-pattern generator, dc supply, formations such as pliotron circuit, adopt the high-low pressure compound circuit, promptly the output loop of the first pliotron circuit and the second pliotron circuit will hang down high-pressure work voltage even to the gap, impulse generator output connects the input control end of first pliotron, what its output loop connected is the working power that is higher than flash-over characteristic, what the input of second pliotron connected is constant pressure source, constant source voltage is voltage participate-reform point with the gap, its output is loop-coupled to be high-voltage DC power supply, two output loops limit electric current by triode, replace the power resistor current limliting.

The output loop of second pliotron connects behind the first power tube output loop joint gap more earlier, connects the dc supply that adds again by a diode on the first pliotron output loop.

Its course of work is as follows: first pliotron is open-minded when pulsewidth, and the discharge working clearance may be three kinds of discharge conditions respectively, open circuit, spark discharge and short circuit.During open-circuit condition, the gap impedance is bigger, and it is open-minded to control second pliotron by constant pressure source.The output HVDC, make the two ends, gap load a high voltage and impel gap breakdown, be the spark discharge state after the puncture, at this moment gap impedance is lower, at this moment under the first power diode opening state, offer discharging gap with the low-voltage dc power supply of 35-45V according to gap discharge voltage characteristic (about 20-30V), produce the surplus machining energy of erosion; When the gap is short-circuit condition, because the restriction of diode makes the operating current of discharging gap rise very little.

The utility model has the advantages that: with high pressure (about 100V), the compound high frequency electric source that is used for wire cutting machine tool of two kinds of voltages of low pressure (about 40V), and with the alternative power resistor current limliting of semiconductor devices restriction electric current, reduce hear rate, reduced useless power consumption, this power supply is energy-conservation, under same power output, input power is the 40-50% of former power supply, because it is operated in spark discharge state rather than short-circuit condition mostly, so machine tooling ability and efficient improve, can process big thickness workpiece, machined surface roughness is low, and the highest process velocity can reach 100MM ²More than the 1/MM.

The utility model is described in further detail below in conjunction with accompanying drawing with by embodiment:

Fig. 1 is a line map, and Fig. 2 is a kind of embodiment detail drawing.

Impulse waveform is produced by oscillator 1, pulse width and also adjustable by the impulse generator generation at interval, oscillator can constitute in many ways, commonly used have a crystal oscillator frequency division, single, bistable circuit and multivibrator, constitute with 555 circuit among the embodiment, oscillator is through the input of the driver 2 inputs first power tube MI, power tube can be high power transistor or FET IRF, driver is the amplifying circuit that a triode NI constitutes, available phase inverter or with penetrating with amplifying circuit, driver provides one to stablize grid voltage or power tube base current for when pulsewidth the MI FET, and when the pulse spacing, close MI, hang down high voltage source 3,4 by a diode D1, D2 also transports to discharging gap 5 through the MI loop, and constant pressure source 6 provides comparatively convenient by the work dividing potential drop of driver.R5, R6 provide among the figure, the HVDC source that is used to open the second power tube M2 and transports to the gap.Just can provide clearance G AP desired power with many groups circuit.High-low pressure work be respectively about 100V and 40V about.

Its driver can have the same effect with Great Power Driver when power tube was high power transistor.Second power tube with the HVDC operating voltage directly connection also roughly the same effect can be arranged when the gap, but on the first power tube output loop, to increase electronic switch or diode to reduce by two kinds of disadvantageous influencing each other of power supply.

Claims

1, a kind of line cutting mill bed power supply, comprise pulse-pattern generator, dc supply, formations such as pliotron circuit is characterized in that: adopt the high-low pressure compound circuit, promptly the output loop of the first pliotron circuit and the second pliotron circuit will hang down high-pressure work voltage even to the gap, impulse generator output connects the input control end of first pliotron, what its output loop connected is the working power that is higher than flash-over characteristic, what the input of second pliotron connected is constant pressure source, constant source voltage is voltage participate-reform point with the gap, its output is loop-coupled to be high-voltage DC power supply, two output loops limit electric current by triode, replace the power resistor current limliting.

2, by the described power supply of claim 1, the output loop that it is characterized in that second pliotron connects earlier behind the first power tube output loop joint gap again, connects the dc supply that adds again by a diode on the first pliotron output loop.

3,, it is characterized in that pliotron all adopts FET (IRF) by claim 1,2 described power supplys.

4, by claim 1,2 described power supplys, it is characterized in that the high-low pressure operation DC voltage is respectively about 100V and 40V about.