JPH0472643B2 - - Google Patents

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to electrical discharge machining equipment.

[Prior art]

In a conventional electric discharge machine, the workpiece is set on a setting table installed in a machining tank that stores machining fluid, and the electrode is placed opposite the workpiece using a feeding device, while maintaining a minute gap between the electrode and the workpiece. It is configured to perform machining by repeatedly applying submerged pulse discharge between bodies. For this reason, the work of attaching and positioning the electrode and the workpiece is not easy, and the setup requires a long time, resulting in a reduction in the operating rate of the machine.

[Configuration of the present invention]

The present invention improves this point, and includes a machining tank that stores machining fluid, a machining unit into which the machining fluid flows when carried into the machining tank, and a machining unit that is connected to the machining tank. Loading,
The machining unit includes a setting table for setting the workpiece, a setting table for attaching an electrode to the workpiece, and a relative machining feed between the two setting tables. The present invention is characterized by being provided with a machining feed device and a cover that protects the movable portion of the machining feed device from dripping from machining liquid.

〔Example〕

The present invention will be explained below with reference to an embodiment of the drawings.
In Figure 1, 1 is the bed, 2 is the processing tank, and 3 is the bed.
4 is a machining fluid stored in a tank, 4 is a pole, 5 is an arm, 6 is a hoist, 7 is an operation box, and 8 is a hook. Reference numeral 9 denotes a processing unit that includes an electrode 10 and a workpiece 11, 12 a setting table for setting the workpiece, and 13 a setting table for attaching the electrode.The setting table 12 is fixed to the lower end of the feed screw 14. , the setting table 13 is screwed into the feed screw 14. 1
5 is a support plate fixed to the upper end of the feed screw 14, and a servo motor 16, 1 for driving the feed screw 14 is connected to this support plate.
7 is a bellows that protects the feed screw 14 from dripping from the machining fluid, and 18 is an eye bolt for supporting the unit.

In the above figure, a drive control power source that controls the servo motor 16, a machining pulse power source that supplies electricity between the electrode 10 and the workpiece 11, and a machining fluid 3 in the tank 2.
A pump device for supplying and circulating the water is omitted.

In the above, the machining unit 9 is pulled out from the machining tank 2 and subjected to preparatory work during the setup work before starting machining. The workpiece 11 and the electrode 10 are mounted on setting tables 12 and 13, respectively, and their positions are adjusted. The processing unit 9 with the electrode and workpiece set in this way is then hung on the eye bolt 18, suspended from the hook 8 of the crane, and lifted up.
The arm 5 is rotated around the pole 4 of the crane, the hoist 6 is moved along the arm 5, and the hoist 6 is moved along the arm 5.
Once positioned on the machining tank 2, the hook 8 is lowered and the suspended machining unit 9 is immersed in the machining liquid 3 in the tank 2. As shown in the figure, the processing unit 9 has electrode and workpiece setting tables 12 and 13.
is engaged by the feed screw 14, and the machining fluid can freely enter and exit from the surroundings, and the machining tank 2
By inserting the stored machining fluid 3 into the inside, the stored machining fluid 3 easily flows and enters between the electrode 10 and the workpiece 11.

However, after the preparation work, the control power circuit is connected to the servo motor 16 by inserting a plug, etc.
A processing pulse power source is connected between the electrode 10 and the workpiece 11. If the switch is turned on, the servo motor 16
is activated, the electrode 10 is lowered, a minute gap is maintained between the electrode 10 and the workpiece 11, a pulse discharge is generated, and the discharge is repeated to proceed with machining. During electrical discharge machining, the machining fluid 3 in the tank flows through the machining unit and through the machining gap to perform a discharge medium, cooling action, and removal of machining debris, thereby performing stable electrical discharge machining. The control of the feed screw 14 by the servo motor 16, the feed control of the setting table 13, etc., is protected from dripping by the bellows 17, so the movable part of the feed screw 14 is protected from corrosion or clogged with machining waste. The servo feed is always stable and smooth, and high-speed, efficient electrical discharge machining is performed.

When the predetermined electric discharge machining is completed in this manner, the machining unit 9 is again lifted up from the machining tank by the crane, moved to another location, and the workpiece is removed. The electrode and workpiece are set in the machining unit again, and transported to the processing tank for machining.The electrode and workpiece are then set and reset, and the electrical discharge machining work is repeated at different locations using a transport device in order. Efficient processing can be performed. If there are a plurality of machining units, at least two, the work of setting and resetting one machining unit can be completed while another unit is performing electric discharge machining, and the operating rate of the electric discharge machine is improved.

FIG. 2 shows another embodiment of the processing unit, in which a fixing column 19 is provided on a setting table 12 for a workpiece 11, and a support plate 15 is fixed to the upper end. Reference numeral 20 denotes a shaft that slides on the support plate 15, and is slid up and down by a rack and pinion mechanism 21. A setting table 13 for attaching an electrode is provided at the lower end of the sliding shaft 20, and the electrode 10 is set thereon. 22 is a drip-proof cylinder surrounding the setting table 13, and 23 is a motor drive device that sends the electrode 10 to the XY plane perpendicular to the plane of the paper.

The electrode and the workpiece are set on the setting tables 12 and 13, respectively, and after the preparation work, the machining unit is inserted into the machining tank 2 using the crane shown in FIG. . Servo feed in the Z-axis direction and machining feed in the X-Y axis direction can be achieved by plugging in an NC-controlled feed device to the upper and lower Z-axis feed motors 16 and the X-axis and Y-axis drive motors 23 on the right angle plane for processing feed. Precision machining can be performed while simultaneously or alternately applying
It is possible to stably process any desired purpose. If the feed control of the X-Y axes is also servo-controlled according to the state of the machining gap, stable machining can be achieved without arcing or short circuits. Furthermore, it is also possible to process the overall shape by using a simple electrode such as a rod as the processing electrode through three-dimensional feed control.

Further, the electrode 10 is immersed in the liquid in the processing tank 2 for processing, but since the movable part on the set table 13 is entirely covered by the drip-proof cylinder 22, it will not be disturbed by the intrusion of the processing liquid. It is possible to continue stable machining without any problems.

In the above-mentioned embodiment, the electrode is given a machining feed, but the same effect can be obtained by applying a feed to the opposite workpiece side.

Furthermore, the transport device is not limited to a crane. for example,
If the side wall of the machining tank 2 can be opened and closed, the machining unit can be conveyed and set from the side. In this case, after setting, machining fluid can be supplied and stored in the machining tank and machining can be started. Any device moving on rails or rollers is contemplated.

〔effect〕

As described above, since the present invention allows the machining unit to be taken out of the machining tank where electrical discharge machining is performed, it is possible to attach and remove the electrode and workpiece into the machining unit very easily. By preparing two or more machining units, they can be used alternately, which eliminates setup preparation work, improves the operating rate of the electric discharge machine, and enables efficient electric discharge machining. In addition, since the movable part of the machining feed device in the machining unit is equipped with a drip-proof device against machining fluid, stable and smooth operation is always possible without being disturbed by machining fluid, gas generated, machining debris, etc. servo feeding is performed, which has the effect of enabling high-speed and efficient electrical discharge machining.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of a part of another embodiment thereof. 2... Processing tank, 6... Hoist, 9... Processing unit, 10... Electrode, 11... Workpiece,
12, 13...Set table, 14...Feed screw, 1
6...Motor, 17...Bellows, 22...Drop-proof tube.

Claims (1)

[Claims] 1. In an electric discharge machining device that supplies machining fluid to a machining gap where an electrode and a workpiece face each other and performs machining by repeating pulse discharge, there is a machining tank that stores machining fluid and a process for carrying the machining fluid into the machining tank. Therefore, a machining unit into which machining fluid flows, and a conveying device for carrying the machining unit into and out of the machining tank are provided, and the machining unit includes a setting table for setting the workpiece, and a setting table for setting the workpiece, A setting table on which an electrode is mounted facing the set table, a processing feed device for providing relative processing feed between the two setting tables, and a cover for drip-proofing the movable part of the processing feed device against machining liquid. Electrical discharge machining equipment featuring: