JPS5894931A - Spark erosion equipment - Google Patents

Abstract

PURPOSE:To drain processing liquid also out of a gap at the end of spark erosion processing, by providing an outlet port for ejecting the processing liquid from the tip of an electrode throughout the processing and by switching the outlet port to suck the processing liquid at the end of the processing. CONSTITUTION:A workpiece 16 is secured on a table 14, processing liquid 12 is filled in a processing vessel 10 and an electrode 20 is moved down to process the workpiece. Throughout the processing, a solenoid valve 26 is opened and a pump 24 is driven so that the processing liquid in a tank 22 is continuously supplied from the tip of the electrode 20. At the end of the processing, a solenoid valve 28 is opened so that the processing liquid 12 in the processing vessel 10 is drained to the tank 22. At the same time, the solenoid valve 26 is closed and other solenoid valves 30, 32 for suction are opened so that the processing liquid supplied by the pump 24 flows into an aspirator 34. At that time, negative pressure is caused in a processing liquid pipe 36 connected to the tip of the electrode 20, so that the processing liquid remaining in the gap between the electrode and the workpiece 16 is sucked and drained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrical discharge machining device, and particularly to an improvement in an electrical discharge machining device that performs electrical discharge machining via a machining fluid between an electrode and a workpiece, and eliminates the machining fluid after machining is completed. .

Conventionally used electric discharge machining apparatuses include those shown in FIGS. 1 to 3. In the figure, lO is a machining tank in which machining fluid 12 is placed, and in this machining tank 10,
A table 14 and a workpiece 16 are placed and fixed. Further, 18 is a serze head, and an electrode 20 is fixed to the tip thereof.

Next, the operation of this conventional device will be explained in order.

First, before starting machining, the workpiece 1.6 is fixed on the table 14. Thereafter, the machining tank 10 is filled with the machining fluid 12 to create the state shown in FIG. Also, at this time, the electrode 20 has already been fixed to the surge head 18. Next, processing is performed while lowering the electrode 20, and a predetermined processing, for example, the second
After the cloth is processed in the state shown in the figure, the processing is completed. At the same time as this processing is completed, the current to the electrode 20 is cut off and the electrode 20 rises.
After the ascent is completed, the machining fluid 12 is discharged, and the electric discharge machining is completed in the state shown in FIG.

In the conventional device having such a configuration and operation, although the machining fluid 12 is discharged from the machining tank 10 after the electrode 20 has finished rising, the machining fluid 12 remains in the machining recess (cavity) of the workpiece 16. It remains as it is. Therefore, the machining fluid 12 remaining in the cavity must be removed by the operator when removing the workpiece 16, which not only causes a significant deterioration in work efficiency but also causes an adverse effect on hygiene. .

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to not only improve workability by forming the cavity so that the machining liquid inside the cavity is also discharged at the end of machining. The purpose is to provide a sanitary electrical discharge machining device.

In order to achieve the above object, the present invention provides an electrical discharge machining device that performs electrical discharge machining by making an electrode and a workpiece face each other in a machining fluid, which has a spout that spouts machining fluid from the tip of the electrode during electrical discharge machining. The present invention is characterized in that it includes a switching device that switches the spout to the one for suctioning the machining fluid after machining is completed.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 4 is a schematic diagram of the entire device using the present invention, and FIGS. 5 to 8 are sectional views of main parts for explaining the operation, and the same parts as in FIGS. 1 to 3. are given the same reference numerals and their explanations will be omitted.

In FIG. 4, 22 is a machining fluid tank, from which machining fluid 12 can be spouted from the tip of the electrode 20 into the machining tank 10 via a pump 24 and a solenoid valve 26 for jetting. There is. Further, 28 is a draining electromagnetic valve, which is operated when draining the machining fluid 12 in the machining tank 10 into the machining fluid tank 22. 30.32 is a suction solenoid valve that draws the machining fluid 12 from the tip of the electrode 20 into the machining fluid tank 22.
34 is a suction aspirator. Further, 36 is a machining fluid pipe.

Next, the operation of the present invention will be explained in accordance with the order shown in FIGS. 5 to 8.

First, before electrical discharge machining, open the ejection solenoid valve 26 and press the electrode 20.
The machining fluid 12 is fed into the machining tank 10 from the tip or by means not shown, so that the machining fluid 12 is introduced into the machining tank 10 as shown in FIG.
Fill with 2. Next, the electrode 20 is lowered to perform electrical discharge machining, but at this time, the ejection solenoid valve 26 is turned on as shown in FIG.
Open the machining fluid tank 2 and operate the pump 24.
The machining liquid 12 in 2 is continuously supplied from the tip of the electrode 20 to the space between the electrode 20 and the workpiece 16. When the predetermined electrical discharge machining is completed, as shown in FIG. 7, the electromagnetic valve 28 for drainage opens while the electrode 20 remains stopped at the electrical discharge machining end position, and the machining fluid 12 in the machining tank 10 is discharged into the machining fluid tank 22. It is discharged. Furthermore, at the same time as this discharge or immediately after the discharge is completed, the jetting solenoid valve 26 is closed and the suction solenoid valve 30.32 is opened to flow the machining fluid 12 sent by the pump 24 into the suction aspirator 34, and the electrode Machining fluid piping 36 leading to the tip of 20
This will generate negative pressure. This negative pressure causes the machining liquid 12 remaining in the cavity between the electrode 20 and the workpiece 16 to be sucked and discharged. When this discharge is completed, the electrode 20 is raised as shown in FIG. 8, and the electrical discharge machining is completed.

At this time, there is no machining liquid 12 remaining not only in the machining tank 10 but also in the cavity of the workpiece 16.

According to the present invention, machining fluid 1 is added to machining tank 10 at the end of electrical discharge machining.
2 is completely eliminated, it is easy to add and remove the workpieces 16, and since the operator does not come into contact with the machining fluid 12, it is also highly effective in terms of hygiene.

The machining fluid 12 is spouted to the tip of the electrode 20 by a pump 24, and a suction aspirator 34 is provided in the machining fluid piping 36 from the pump 24, and the negative pressure generated by the aspirator 34 causes the machining fluid 12 to be The electrode 20
If it is formed so that suction is drawn from the tip, only one pump is required, and equipment costs can be reduced.

As described above, the present invention is capable of completely discharging the machining fluid of the discharge machining end wave, and therefore not only can the workability be significantly improved, but also has excellent sanitary effects.

[Brief explanation of drawings]

1 to 3 are cross-sectional views sequentially showing the operation of the conventional device;
FIG. 4 is a schematic diagram of the present invention, and FIGS. 5 to 8 are sectional views sequentially showing the operation of the present invention. In each figure, the RML members are given the same reference numerals, 12 is a machining fluid, 16 is a workpiece, 20 is an electrode, 24 is a pump, 34 is a suction aspirator, and 36 is a machining fluid piping. Agent Patent attorney Shin Kuzuno - (1 other person) Figure 7 Figure 8

Claims (1)

[Claims] (1) An electrical discharge machining device that performs electrical discharge machining by making an electrode and a workpiece face each other in machining fluid, has a spout that spouts machining fluid from the tip of the electrode during electrical discharge machining, and the spout is connected to the spout after machining is completed. An electrical discharge machining device characterized by being equipped with a switching device for switching to suction of machining fluid. (2. In the device according to claim (1), the machining fluid is ejected to the tip of the electrode using a pump, and
An electrical discharge machining apparatus characterized in that a suction aspirator is provided in a machining fluid piping from a pump, and the machining fluid is sucked by negative pressure generated by the aspirator.