JPH0360615B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electric discharge machining apparatus equipped with a sensor that detects and displays the presence or absence of machining fluid in a machining tank.

[Prior Art] Figures 3a and 3b are a front view and a side view of a conventional electrical discharge machining apparatus. 1 is a bed, 2 is a table that slides on this bed 1, 3 is a processing tank fixed on this table 3, 4 is a hinge fixed to this processing tank 3, 5 is a processing via this hinge 4 A door attached to the tank 3, 6 a lock for locking the door 5, 7 a column fixed to the bed 1,
8 is a head fixed to this column 7, 9 is a processing electrode attached to this head 8 by fitting etc., 1
0 is a workpiece placed in the machining tank 3, and 11 is a machining fluid filled in the machining tank 3.

The conventional electric discharge machining apparatus is constructed as described above, and will be explained in accordance with the steps before and after machining. First, the workpiece 10 is placed and fixed in the machining bath 3, and the machining electrode 9 is attached to the head 8. Next, after closing the door 5 with the lock 6, while moving the table 2 in the XY direction, align the machining part of the workpiece 10 with the position of the machining electrode 9, and apply the non-conductive machining fluid 11 to the workpiece. 10
After filling the processing tank 3 to the level where it is immersed,
The head 8 is lowered and predetermined electrical discharge machining is performed. When machining is completed, drain the machining fluid 11, and after confirming that it has been completely discharged, open the door 5 and remove the workpiece 10.
Take out.

In the conventional electric discharge machining apparatus as described above, the door 5 is opened while the machining fluid 11 remains in the machining tank 3 due to an erroneous operation by the operator, etc., and the machining fluid 1 is removed.
1 may leak outside. For example, in the case of a die-sinking electrical discharge machining device, an oil-based material is used for this leaked machining fluid 11, so there is a risk of it catching fire and causing a fire accident.
For example, in the case of wire electrical discharge machining equipment that uses 1, this leaked machining fluid 11 causes rust on iron-based components such as ball screws, resulting in a decrease in machining accuracy and damage to the equipment. As a result, there were problems such as the risk of electrical leakage.

This invention was made to solve this problem, and it is possible to check the remaining machining fluid in the machining tank by displaying it, and while the machining fluid remains, the door of the machining tank is locked, which prevents machining due to malfunction. The object of the present invention is to obtain an electrical discharge machining device that prevents liquid from flowing out.

[Means for Solving the Problems] The electric discharge machining apparatus according to the present invention includes a machining fluid sensor device that is installed at the bottom of a machining tank and detects the presence or absence of machining fluid in the machining tank; A display means that can confirm the presence or absence of machining fluid by detection;
The door of the machining tank is locked based on the fact that the machining fluid sensor device detects that machining fluid is present at the bottom of the machining tank, and the machining fluid sensor device detects that machining fluid is not at the bottom of the machining tank. The door locking device unlocks the door of the processing tank based on the processing temperature.

[Operation] In the present invention, the machining fluid sensor device detects the presence or absence of machining fluid at the bottom of the machining tank, and the display means displays the presence or absence of machining fluid based on the detection of the presence or absence of machining fluid by the machining fluid sensor device. Based on the machining fluid sensor device detecting that machining fluid is present at the bottom of the machining tank, the door lock device locks the door of the machining tank, and the machining fluid sensor device detects that machining fluid is not at the bottom of the machining tank. Based on the detection, the door lock device unlocks the processing tank door. At this time, since the machining fluid sensor device is installed at the bottom of the machining tank, the accuracy with which the machining fluid sensor device detects the completion of draining the machining fluid in the machining tank is improved.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. In FIG. 1, numerals 1 to 11 are parts that are exactly the same as those of the conventional apparatus, 12 is an indicator light, part A surrounded by a dotted line is a door lock device, and part B is a machining fluid sensor device. FIG. 2 is a detailed view of parts A and B, in which 13 is a claw that locks the door 5, 14 is a column that pivotally supports this claw 13 and is fixed to the processing tank 3, and 15 is a support for the claw 13. A compression spring 16 has a pressing force that rotates the claw 13 in the clockwise direction against the pressing force of the compression spring 15, and a piston 17 that rotates the claw 13 clockwise is fixed to the bottom of the processing tank 3. It is a limit switch, and is connected to the lighting/extinguishing contact of the indicator light 12. 18
is a float fixed to the actuator of this limit switch 17, and 19 is the limit switch 1.
This is a solenoid valve that opens and closes pneumatic pressure from a pneumatic source (not shown) in accordance with the opening and closing of contacts 7.

20 and 21 are pneumatic pipes connected between the illustrated interruptions, and 22 is a piston 1 connected to the pneumatic pipe 21.
This is the cylinder that acts on 6.

In the electric discharge machining apparatus constructed as described above, a workpiece 10 is attached to the machining tank 3, a machining electrode 9 is attached to the head 8, and the door 5 is closed and locked with the lock 6. At this time, the contact point of the limit switch 17 is in the OFF position, so the solenoid valve 19 is "open" and the piston 16 is
Air pressure is applied to the compression spring 1, and this force
The claw 13 rotates clockwise against the force of the door 5.
is not in a locked state, and the indicator light 12 is not lit. Next, the table 2 is moved in the XY directions to align the machining part of the workpiece 10 with the machining electrode 9, and the machining tank 3 is filled with a non-conductive machining fluid 11. When the machining fluid 11 is filled, the float 18 at the bottom of the machining tank 3 floats up, and the buoyant force at this time acts on the actuator of the limit switch 17, turning the contact to the on position, and the solenoid valve 19 closes to release air pressure. The claw 13 descends under the action of the repulsive force of the compression spring 15 and locks the door 5, and at the same time the indicator light 12 lights up.

Machining is started while the machining tank 3 is in the above state, and the machining fluid 11 is discharged when the predetermined machining is completed. As the machining fluid 11 is discharged from the bottom of the machining tank 3, the float 18 is lowered and the limit switch 1 is activated.
When the contact point 7 is in the OFF position, the solenoid valve 19 opens and air pressure is applied to the cylinder 22, the pawl 13 rises, the door 5 is unlocked, and the indicator light 12 goes out. Check that the light goes out. Then open door 5,
The workpiece 10 will be taken out. The limit switch 17 detects the discharge of the machining fluid 11 because the limit switch 17 and the float 18 that operates the limit switch 17 are installed at the bottom of the machining tank 3, so the accuracy of detecting the completion of discharging the machining fluid in the machining tank 3 is high. It is something.

In the above embodiments, an example of die-sinking electrical discharge machining is described, but wire electrical discharge machining may also be used.Although the presence or absence of machining fluid is confirmed using an indicator light, other confirmation means may be used. Further, although an example using a combination of a limit switch and a float as a machining fluid detection sensor has been described, other level detection means can also produce the same effects as in the above embodiment.

[Effects of the Invention] As described above, in the present invention, the machining fluid sensor device detects the presence or absence of machining fluid at the bottom of the machining tank, and the display means detects the presence or absence of machining fluid based on the detection of the presence or absence of machining fluid by the machining fluid sensor device. When the machining fluid sensor device detects that machining fluid is present at the bottom of the machining tank, the door lock device locks the door of the machining tank. Since the door lock device unlocks the door of the machining tank based on detecting that the machining fluid is not at the bottom, the accuracy with which the machining fluid sensor device detects the completion of draining the machining fluid in the machining tank is improved. The remaining machining fluid in the machining tank can be reliably confirmed by the display on the display means, and leakage of machining fluid due to malfunction can be reliably prevented by locking the door with a door locking device, so there is no risk of fire or electrical leakage. This has the effect of providing a highly safe electrical discharge machining device.

[Brief explanation of drawings]

Figures 1a and b are front and side views of an electric discharge machining apparatus according to an embodiment of the present invention, Figure 2 is a detailed view of parts A and B in Figure 1, and Figures 3a and b are conventional FIG. 3 is a front view and a side view showing the electric discharge machining apparatus of FIG. In the figure, 3 is a machining tank, 5 is a door, 9 is a machining electrode, 10 is a workpiece, 11 is a machining fluid, 12 is an indicator light, and 17 is a limit switch. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A machining electrode and a workpiece are installed in a machining tank having a door, and electricity is supplied between the machining electrode and the workpiece via a machining fluid in the machining tank, In electrical discharge machining equipment that performs electrical discharge machining by immersing a workpiece in machining fluid, there is a machining fluid sensor device installed at the bottom of the machining tank that detects the presence or absence of machining fluid in the machining tank, and a machining fluid sensor device that detects the presence of machining fluid in the machining tank. The machining fluid sensor device locks the door of the machining tank based on the fact that the machining fluid sensor device detects that machining fluid is present at the bottom of the machining tank. An electrical discharge machining apparatus comprising: a door lock device that unlocks a door of a machining tank based on detecting that machining fluid is not present at the bottom of the machining tank.