JPS6037224Y2 - Jet machining fluid supply device for electrical discharge machining - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a jet machining fluid supply device for electrical discharge machining.

The machining electrode and the workpiece are faced with a small machining gap,
It is well known that the workpiece is machined by applying current between the machining electrode and the workpiece while jetting a machining liquid into the micromachining gap.

However, when the workpiece has many complicated unevenness or curved parts, deep slits, holes with irregular bottoms, etc., or when it is necessary to perform machining of non-simple shapes, cutting debris or chips generated during machining may occur. It is not always possible to remove the particles sufficiently by jumping the electrode up and down due to accumulation of gas or clogging of the gas.For this reason, spray nozzles are installed in the machining gap from multiple directions at all times or when the electrode jumps, etc. It is being carried out to make the water flow into the water.

The present invention relates to a jet machining fluid supply device having such a plurality of nozzles, and the machining fluid is once supplied and stored in a distribution tank equipped with a vibration device, and multiple injections are performed while applying ultrasonic vibration. The device discharges water through a nozzle into a minute gap, and a solenoid valve is installed at the inlet from the distribution tank to each injection nozzle, and the excitation control of each solenoid coil of the solenoid valve is switched and controlled using an electronic switch such as a transistor. It is designed to efficiently remove chips and gas, and to control the switching of the solenoid valve using an electric circuit, thereby avoiding the intervention of rotating mechanisms such as electric motors, making it compact and reliable in operation. be.

Next, an embodiment of the device of the present invention will be explained with reference to a side cross-sectional view of the main parts shown in Fig. 1 and a wiring diagram of a control circuit for a solenoid valve shown in Figs. 2a and b. Distribution tank 2
will be established.

3a, 3b, and 3c are three injection nozzles, each with a steel ball 4a at its inlet.

5a, 6a and excitation coil/I'4bt 5bt 6b
A solenoid valve section 4.5.6 consisting of the following is provided.

The excitation circuit of the excitation coils 4b, 5b, and 6b is shown in FIG. 2a.

b will be described later.

In addition, 7 is a machining fluid, 8 is an attraction magnet having an attraction coil 8a, 9 is a vibration magnet and has a vibration coil 9a, and 10 is an excitation device for the vibration coil 9a.

Also, Figure 2 a and b are originally excited, and 4b, 5b, 6b
These excitation circuits use a transistor as an electronic switch. In the case of Fig. 2a, when switch S is turned on, capacitor C1 is first charged with the voltage of power supply E, and the specified base voltage of transistor Tr2 is reached. At this point, the transistor Tr2 is turned on and a current is passed through the coil 5b to attract the steel ball 5a shown in FIG. 1 to the injection nozzle 3b.
Block the entrance.

In this state, the capacitor C3 is charged, the transistor Tr is turned on, the coil 4b is excited, the steel ball 4a is attracted, the inlet of the nozzle 3a is blocked, and the nozzle 3b is closed.
Open your mouth.

Similarly, by charging the capacitor C2, the transistor T
When r3 is turned on, the coil 6b is energized, attracts the steel ball 6a, blocks the inlet of the nozzle 3c, opens the inlet of the nozzle 3a, and continues to operate the coils 4b, 5b, 6b as long as the switch is turned on.
One of them is electromagnetized in turn.

The process is similar to that shown in FIG. 2. In this case, by turning on the switch S, the ring counter 11 is activated and the transistor Tr4. Tr3. Apply an operating voltage to the Tr 6, turn on one of them in turn, electromagnetize the coils 4b, 5b, and 6b to attract the steel balls 4at, 5av, and 6a, and block one of the injection nozzles 3av, 3by, and 3c in sequence. .

Next, the operation of the device of the present invention will be explained. First, the supply device 1 is placed on the iron outer casing or machining table of a desired electric discharge machining device or its peripheral equipment, and then the switch is turned on. The attraction magnet 8 is magnetized and the outer casing or Fix it to the processing table by suction.

On the other hand, a pump pumps the machining liquid through the liquid inlet of the supply device 1 to the distribution tank 2.

The oscillation circuit 10 is activated to excite the vibration magnet 9 and apply ultrasonic vibration to the distribution tank 2, thereby making the machining fluid uniform and preventing foreign matter in the machining fluid from clogging the regulating valve. This allows the fluid to be spouted out smoothly together with the machining fluid, and to prevent foreign matter from settling in the closed distribution tank.

Thus, the regulating valve section 4.5 of each injection nozzle 3a, 3b, 3c
．． If the excitation circuit 6 is operated, the injection nozzles 3a,
3b and 3c alternately start and stop the jet flow, so the overall direction and strength of the jet flow is changed while being circulated, and the machining liquid is switched under pressure and injected to the part where machining debris, gas, etc. are likely to accumulate in the gap. It can be efficiently eliminated by

Therefore, processing performance can be significantly improved.

Moreover, in the device of the present invention, the switching and adjustment of the jet flow from the injection nozzle is performed using an electric circuit using an electronic switch such as a transistor, so there is no need for a rotating mechanism such as a motor, and the device is small, lightweight, and reliable in operation.

Although there are three injection nozzles in the figure, there may be as many as there are and there is no need to limit the order in which the injection nozzles are blocked.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of an embodiment of the device of the present invention, Fig. 2a
, b is a wiring diagram of the electronic excitation circuit of the regulating valve section. 1... Jet processing liquid supply device, 2... Distribution tank, 3a, 3 b, 3 c... Injection nozzle, 4.5.6... Adjustment valve part, 7...
Processing fluid.

Claims (1)

[Scope of utility model registration request] In an apparatus that uses a plurality of machining fluid spray nozzles to supply jet machining fluid around an electrical discharge machining gap, one distribution tank equipped with a plurality of machining fluid spray nozzles and vibration of the distribution tank. a device, a normally open flow rate adjustment solenoid valve provided at the inlet to each nozzle of the distribution tank, and a flow rate regulating solenoid valve that is in a normally open state and that causes the machining liquid to be jetted out from each of the nozzles all at once through the solenoid valve, and the jet flow is sequentially jetted. A jet machining fluid supply device for electric discharge machining, which is provided with an excitation control circuit for interruption control of reduction or stop.