JPS6049532B2 - Electric discharge machining equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrical discharge machining device that performs machining by immersing a workpiece in a machining fluid in an immersion tank, and particularly relates to an electrical discharge machining device that can efficiently discharge the machining fluid. .

FIG. 1 is a sectional view showing a wire-cut electric discharge machining device using a conventional immersion machining method. In the figure, 1 is a wire electrode, 2 is an arm for guiding this wire electrode into the machining fluid, and 3 and 4 are a guide roller attached to this arm; 5 a lower wire electrode guide attached to arm 1;
6 is an upper wire electrode guide provided above the surface of the machining fluid; 7 is a guide roller that guides the wire electrode 1 to the top; 8 is a surface plate; 9 is an immersion tank in which the surface plate is attached and the machining fluid is placed; 9A 9B is a discharge port for discharging the machining fluid provided at the bottom of the immersion tank 9, 10 is a discharge plug for opening and closing this discharge port, and 11 is a machining fluid overflow outlet. A storage tank, 12 is a supply pump that supplies machining fluid from the machining fluid storage tank through the fluid supply pipe 13, 14 is an overflow pipe that leads the machining fluid from the overflow outlet 9A to the machining fluid storage tank 11, and 15 is a supply pump that supplies the machining fluid from the discharge port 9B. A drain pipe 16 leading to the liquid storage tank 11 is a workpiece attached to the surface plate 8.

The immersion tank 9 to which the workpiece 16 and the surface plate 8 are attached is attached to an X-Y cross table (not shown) provided on the machine base, and Exercise is allowed. Next, the effect will be explained.

Although not shown, the wire electrode 1 is supplied from a wire electrode supply reel attached to a column that stands up on the machine base, through a guide roller 3, a guide roller 4, and a lower wire electrode guide 5).
After processing the workpiece 16, it reaches the upper wire electrode guide 6 and guide roller 7, and is wound up by a wire electrode take-up reel (not shown) attached to the wire electrode supply reel. Further, the machining fluid is supplied from the machining fluid storage tank 11 to the supply pump 12.
The machining liquid is supplied into the immersion tank 9 through the liquid supply pipe 13, and the immersion tank 9 is filled with the machining liquid to a desired liquid level. In this case, although not shown, a desired liquid level height is maintained by a commonly used liquid level adjustment mechanism using a partition plate, bellows, or the like. Excess machining fluid is then discharged from the overflow outlet 9A and returns to the machining fluid storage tank 11 through the overflow pipe 14. In this way, the workpiece 16
The wire electrode 1 is controlled by a control device (not shown) so that the X-Y cross table (not shown) on which the
, the workpiece 16 is electrically discharged to perform machining. When the machining liquid in the immersion tank 9 is to be emptied after machining is completed, the supply pump 12 is stopped, the discharge plug 10 is lifted upward, and
The machining fluid is discharged from the discharge port 9B by natural flow and returned to the machining fluid storage tank 11 via the drain pipe 15. In the conventional wire-cut electric discharge machining apparatus as described above, when actually machining, the machining fluid needs to exist uniformly around the workpiece, so the workpiece 16, the lower wire electrode guide 5
It is also necessary to immerse the arm 2 in the machining liquid in the immersion tank 9, and the immersion tank 9 tends to become larger.

Therefore, in such a case, the above-mentioned dipping tank 9 should be removed after processing is completed.
When trying to drain and empty the machining fluid inside, drain plug 1
Simply lifting the 0 and discharging it from the discharge port 9B takes too long and is inefficient. Furthermore, if the discharge port 9B is made larger, the discharge plug 10, drain pipe 15, etc. will become larger, and the immersion tank 9, the X-Y cross table, etc. will be deformed, which is uneconomical, and may lead to a decrease in accuracy. There is a big possibility. This invention was made to improve the above-mentioned drawbacks of the conventional ones, and provides an electric discharge machining device that can easily discharge the machining fluid from the immersion tank in a short time! The purpose is to provide

This invention relates to an electric discharge machining apparatus having an immersion tank for immersing a workpiece in a machining fluid, and a discharge port provided at the bottom of the immersion tank for discharging the machining fluid, and a means for detecting an open state of the discharge port. This electric discharge machining apparatus is characterized in that it is equipped with a drain pump that is operated in response to the detection signal and discharges the machining fluid.

FIG. 2 is a cross-sectional view showing an embodiment of the present invention.
6 is exactly the same as the above-mentioned conventional device.

Reference numeral 17 indicates a discharge pump that discharges the machining liquid from the immersion tank 9 through the drain pipe 18, 19 a limit switch that detects the lifted position of the discharge plug 10, and 20 a liquid level such as a float switch provided in the immersion tank 9. The detection switch detects the liquid level when the liquid level of the machining liquid decreases as it is discharged and reaches a lower limit.

The method of performing electric discharge machining using the apparatus configured as described above is the same as that for the conventional apparatus described above.

In order to drain and empty the machining fluid in the immersion tank 9 after completion of machining or when the wire electrode 1 is disconnected during machining, first stop the supply pump 12 and start machining into the immersion tank 9. Cut off the fluid supply. Next, when the drain plug 10 is lifted and fixed, the machining fluid is naturally discharged from the discharge port 9B provided at the bottom of the immersion tank 9 and returned to the machining fluid storage tank 11 via the drain pipe 15. At the same time, the drain plug 1
0 is installed above the drain plug 10 by lifting it.
The limit switch 19 activated, sends the detection signal to the discharge control circuit (not shown), and issues a first discharge start signal. When a signal from the discharge control circuit is sent to the discharge pump 17, the discharge pump 17 is activated and discharges the machining fluid into the machining fluid storage tank 11 through the drain pipe 18. In this way, the machining fluid is discharged out of the immersion tank 9 from both the discharge port 9B and the discharge pump 17 in a large amount and in a short time. As the discharge progresses,
When the liquid level in the immersion tank 9 decreases and eventually reaches the lower limit, a liquid level detection switch 20 such as a float switch installed near the bottom of the immersion tank 9 operates to detect that the liquid level is at the lower limit. The detection signal is sent to the discharge control circuit, and a discharge stop signal is issued. When this first discharge stop signal is sent to the discharge pump 17, the discharge pump 17 is stopped. In this way, the discharge of the machining fluid from the discharge pump 17 is stopped, and the machining fluid is discharged only from the discharge port 8B, and eventually the machining fluid in the immersion tank 9 becomes empty. In addition, although the above explanation did not mention the details of starting and stopping the supply pump 12,
In order to stop the supply pump 12, the above-mentioned discharge pump 1
As in case 7, the liquid level can be configured to be automatically stopped by a liquid level detection switch or the like when the desired liquid level is reached.

The limit switch only needs to be located at a position where it can detect the opening operation of the drain plug 10, and does not necessarily need to be provided above the drain plug. Further, the means for detecting the open state of the discharge port is not limited to the limit switch, and other means may be employed. The discharge pump 17 may be stopped by a timer or other means. The present invention can be applied not only to wire-cut electric discharge machining apparatuses but also to general-purpose electric discharge machining apparatuses and other electric discharge machining apparatuses in which a workpiece is machined by immersing it in a machining fluid.

As described above, the present invention has the effect of being able to discharge a large amount of machining fluid in a short time when it is necessary to discharge the machining fluid in the immersion tank due to its simple configuration.

And since the discharge pump can be started and stopped automatically, it is very easy to operate.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional wire-cut electric discharge machining apparatus, and FIG. 2 is a cross-sectional view of a wire-cut electric discharge machining apparatus according to an embodiment of the present invention. In the figure, 1 is a wire electrode, 2 is an arm, 3 and 4 are guide rollers, 5 is a lower wire electrode guide, 6 is an upper wire electrode guide, 7 is a guide roller, 8 is a surface plate, 9 is an immersion tank, and Hiro is Overflow outlet, 9B is a discharge port, 10 is a discharge plug, 11 is a processing liquid storage tank, 12 is a supply pump, 16 is a workpiece, 17 is a discharge pump, 19 is a limit switch,
20 is a liquid level detection switch.

Claims (1)

[Scope of Claims] 1. In an electric discharge machining apparatus having an immersion tank for immersing a workpiece in a machining fluid, a discharge port provided at the bottom of the immersion tank to discharge the machining fluid, and an open state of the discharge port What is claimed is: 1. An electric discharge machining apparatus comprising: a means for detecting a liquid; and a drain pump that is activated by the detection signal to discharge machining liquid. 2. The electrical discharge machining apparatus according to claim 1, further comprising means for detecting that the level of the machining fluid has reached a lower limit, and means for stopping the drainage pump based on the detection signal.