JP2830692B2 - Wire electric discharge machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of supplying discharge energy between a wire electrode and a tool and a conductive workpiece.
The present invention relates to a wire electric discharge machine that feeds and cuts a workpiece into a desired shape, and in particular, improves a wire electric discharge machine that performs automatic liquid level control when a workpiece is immersed in a machining fluid and processed. It is about.

[0002]

2. Description of the Related Art FIG. 8 is a schematic view showing a machining tank portion of a conventional wire electric discharge machine, and 1 is a wire electrode which is unwound from a wire supply bobbin (not shown). Reference numeral 3 denotes an upper portion of the wire guide, and 4 denotes a lower portion of the wire guide, each of which includes a power supply unit and a wire guide unit, and holds the wire electrode 1 above and below the workpiece 6. 10
Is a processing tank, which is installed on an XY cross table of a machine body (not shown), and has a table 11 inside,
The workpiece 6 is immersed in the working fluid 13. Reference numeral 15 denotes a liquid level detecting means, which is provided above the wire guide upper part 3, and a float switch using a magne switch can be used. Reference numeral 18 denotes a liquid level setting means, which includes an outer box 21 having discharge ports 20a and 20b on the bottom surface, a partition plate 23 having a discharge port 22 below inside the outer box 21, and a discharge port 20a.
, And a discharge door 27 having a discharge port 22 configured to be openable and closable.
And a communication pipe 29. Reference numeral 30 denotes a processing liquid supply device, which includes a dirty liquid tank 30a and a clear liquid tank 30b. Reference numeral 31 denotes a filter pump,
a It is installed above and connected to the filter 33.
Reference numeral 35 denotes a supply pump, which is installed above the cleansing liquid tank 30b, is connected to the upper and lower nozzles 37 and 38, and
To supply the processing fluid. The liquid level setting means 18
Outlets 20a, 22, 20b of the processing fluid supply device 30
Is located above the waste liquid tank 30a.

Next, the operation will be described. The liquid level control method at the time of performing the processing is performed by the electromagnetic valve 2 of the liquid level setting means 18.
5. After closing the discharge door 27 to prevent the processing liquid from being discharged, the supply pump 35 is operated to supply the processing liquid to the processing tank 10.
To supply. The processing liquid is accumulated and the liquid level detecting means 15
Is turned on, the solenoid valve 25 is kept open for a certain period of time to discharge the machining fluid. After the liquid level drops, the solenoid valve 25
Is closed, the discharge of the machining fluid is stopped, and the machining fluid is accumulated. This is repeated to control the liquid level.
When the processing liquid is discharged from the processing tank, the processing is performed by opening the discharge door 27.

When the workpiece 6 is processed, a processing liquid is jetted from nozzles 37 and 38, and the wire electrode 1 is supplied by wire running means (not shown). In addition, the workpiece 6 is arbitrarily moved with respect to the wire electrode while supplying discharge power from the power supply (not shown) to the wire electrode 1, thereby realizing a desired shape processing.

[0005]

Since the conventional wire electric discharge machining apparatus is configured as described above, the liquid level in the machining tank 10 is not at a constant level according to the opening / closing cycle of the solenoid valve 25. Since it has a certain control range, it is difficult to adjust the position of the liquid level detecting means in order to prevent other equipment from being submerged at the upper limit and to prevent the surface of the workpiece 6 from coming out at the lower limit. In addition, the discharge flow rate varies depending on the liquid level of the processing tank, and the liquid level control range varies, making it more difficult to adjust. Also,
For example, depending on the magnitude of the X and Y strokes of the machine main body, it is necessary to change the discharge time and the position of the liquid level detecting means, so that there is a problem that components and control programs cannot be shared and cost increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and the liquid level control can be performed at a constant level. The control width is constant without depending on the liquid level of the processing tank. An object of the present invention is to provide a wire electric discharge machine having a liquid level setting means that can be used in common even in the size of a machine main body.

[0007]

A wire electric discharge machining apparatus according to the present invention immerses a workpiece in a machining fluid to generate an electric discharge between a wire electrode and the workpiece so that the workpiece is discharged. In a wire electric discharge machine for machining, a buoyancy generating means for generating buoyancy in response to a supply of a machining fluid;
Fluid discharge means for making the height at which the fluid is discharged variable, and machining fluid
Liquid level detecting means for detecting the liquid level of the buoyancy.
Fixing means for fixing the raw liquid means to the processing liquid discharge means, and fixing the processing liquid discharge means to an arbitrary position when the liquid level is detected by the liquid level detection means; When the surface is detected, the machining liquid discharging means is fixed at an arbitrary position.

[0008]

Further, the wire electric discharge machining apparatus has a liquid level detecting means for detecting a liquid level of the machining liquid, and engages with the machining liquid discharging means when the liquid level is detected by the liquid level detecting means. Having a fixing means for stopping the machining fluid discharge means at an arbitrary position by generating a thrust in a direction opposite to the buoyancy generated by the buoyancy generating means by the cylinder to be driven and the thrust control means for controlling the thrust of the cylinder It is.

Further, there is provided position detecting means for detecting the vertical position of the working fluid of the working fluid discharge means, and when the position of the working fluid discharge means coincides with a predetermined level of the working fluid, the working fluid is discharged. It stops the means.

Further, the machining fluid discharge means is provided with guide means in the vertical direction of the machining fluid so that the machining fluid discharge means can be slid up and down.

[0012]

The wire electric discharge machine according to the present invention has a liquid surface
Predetermined processing fluid is stored in the processing tank by the detection means.
Detect that The lifting of the discharge means depends on the
Receiving the buoyancy to raise and lower the discharging means. Also, fixing means
Is fixed at a predetermined position, and the discharging means is
Drains the machining fluid by overflow and keeps the fluid level constant
Control.

[0013]

Further, the liquid level detecting means in the present invention comprises:
It detects that a predetermined processing liquid is stored in the processing tank. The float of the discharge means receives buoyancy due to the filling of the working fluid,
Raise and lower the discharging means. Further, the cylinder and the thrust control means fix the discharge means provided with the float at a predetermined position, and the discharge means discharges the processing liquid in the processing tank by overflow and controls the liquid level to be constant.

Further, the floating of the discharge means in the present invention receives buoyancy by the filling of the processing liquid, and raises and lowers the discharge means. The position detecting means detects the position of the discharging means and fixes it by the fixing means to arbitrarily set the liquid level in the processing tank.

Further, the guide means in the present invention facilitates raising and lowering of the discharge means.

[0017]

【Example】

Embodiment 1 FIG. Hereinafter, this embodiment will be described with reference to the drawings. The description of the same reference numerals as in the conventional example is omitted. In the embodiments described below, the reference numerals described in the preceding embodiments are omitted. FIG.
In the figure, reference numeral 50 denotes a float, which is attached to the machining fluid discharge means 52. In this embodiment, the processing liquid discharging means 52
Uses elastic bellows. 55 is a fixing means using an air cylinder,
And is connected by a hose 59 by air pressure from an air source 57. A control device 60 is connected to the liquid level detecting means 15 and the air source 57.

Next, the operation will be described. Since the wire electric discharge machining method is the same as the conventional one, it is omitted here, and only the method of controlling the machining fluid level in the machining tank will be described.

After closing the discharge door 27 to prevent the processing liquid from being discharged, the supply pump 35 is operated to supply the processing liquid to the processing tank 10. When the machining fluid accumulates, the floating 50
Receives buoyancy and emerges on the working fluid level. With this,
The machining liquid discharging means 52 also moves up. In this embodiment, bellows grow. The liquid level in the processing tank gradually increases, the liquid level rises, and a signal indicating that the liquid level detecting means 15 is turned on is received, a signal is output from the control device 60 to the air source 57, and the fixing means 5
5. Apply air pressure to the cylinder used in 5.
Thereby, the cylinder pushes the outer wall of the liquid level setting means 21 to stop the floating of the machining liquid discharge means. The machining fluid further flows in and is supplied above the machining fluid discharge means 52. When the liquid level 13 is supplied to a certain height from the machining fluid discharge means 52, the inflow fluid amount and the machining fluid discharge means 52
The discharge flow rate which overflows and is discharged outside the processing tank is balanced, and the liquid level 13 is controlled to be constant.

Here, based on the result of the liquid level detection by the liquid level detecting means 15, the fixing means 55 is operated to operate the machining liquid discharging means 5
2, the fixing position of the machining liquid discharging means 52 may be set in advance and the machining liquid discharging means 52 may be fixed at a predetermined position.

Embodiment 2 FIG. Another embodiment of the present invention will be described with reference to the drawings. In FIG. 2, reference numeral 70 denotes a cylinder, which is connected to the machining fluid discharge means 52. Numeral 72 denotes a thrust control means for controlling the air pressure from the air source 57.

Next, the operation will be described. In the present invention, after the discharge door 27 is closed to prevent the processing liquid from being discharged, the supply pump 35 is operated to supply the processing liquid to the processing tank 10. When the machining fluid accumulates, the float 50 receives buoyancy and floats on the machining fluid level. At the same time, the machining liquid discharging means 52 also emerges. In this embodiment, bellows grow. The amount of liquid in the processing tank gradually increases, the liquid level rises, a signal indicating that the liquid level detecting means 15 has been turned on receives a signal from the control device to the air source 57, and the thrust control means 72 sends a signal to the cylinder 70. An air pressure corresponding to the thrust balanced with the buoyancy of the float 50 is applied. As a result, the lifting of the machining fluid discharge means 52 is stopped. The machining fluid further flows in and is supplied above the machining fluid discharge means 52. When the liquid level 13 is supplied to a certain height from the machining fluid discharge means 52, the inflow fluid amount and the machining fluid discharge means 52
The discharge flow rate which overflows and is discharged outside the processing tank is balanced, and the liquid level 13 is controlled to be constant.

Embodiment 3 FIG. Third Embodiment A third embodiment of the present invention will be described with reference to the drawings. In FIG. 3, reference numeral 75 denotes a guide means, which is fitted to the float 50 so as to be slidably movable up and down.

Next, the operation will be described. Discharge door 27
Is closed so that the processing liquid is not discharged, and the supply pump 35 is operated to supply the processing liquid to the processing tank 10. When the working fluid accumulates, the float 50 receives buoyancy and floats on the water surface. At the same time, the machining liquid discharging means 52 also emerges. In this embodiment, bellows grow. At this time, the float 50 and the machining fluid discharge means 52 continue to rise smoothly and accurately at the correct position by the guide means 75. The liquid level in the processing tank gradually increases, and the liquid level rises.
Is turned on, the floating of the machining fluid discharge means is stopped by the fixing means 55 or the cylinder 70 and the thrust control means. The machining fluid further flows in and is supplied above the machining fluid discharge means 52. When the liquid level 13 is supplied to a certain height from the processing liquid discharge means 52, the inflow liquid amount and the discharge flow rate which overflows from the processing liquid discharge means 52 and is discharged to the outside of the processing tank are balanced. Surface 13 is controlled to be constant.

Embodiment 4 FIG. Embodiment 4 of the present invention will be described with reference to the drawings. In FIG. 4, reference numeral 80 denotes a position detecting means. Here, a detector such as a potentiometer or a linear encoder can be used.

Next, the operation will be described. After closing the discharge door 27 to prevent the processing liquid from being discharged, the supply pump 35 is operated to supply the processing liquid to the processing tank 10. When the machining fluid accumulates, the float 50 receives buoyancy and floats on the machining fluid level. At the same time, the machining liquid discharging means 52 also emerges. In this embodiment, bellows grow. When the preset processing tank liquid level matches the height of the processing liquid discharge means 52 output from the position detection means 80, a signal is output from the control device 66 to the air source 57, and the cylinder used for the fixing means 55 Apply air pressure to As a result, the cylinder pushes the outer wall of the liquid level setting means 21 and stops the discharge means from rising. The working fluid further flows in and is supplied to a level higher than the discharge means 52. When the liquid level 13 is supplied to a certain height from the processing liquid discharge means 52, the inflow liquid amount and the discharge flow rate which overflows from the processing liquid discharge means 52 and is discharged to the outside of the processing tank are balanced. The surface 13 is constantly controlled at an arbitrary position.

Embodiment 5 FIG. FIG. 5 is a schematic diagram showing Embodiment 5 of the present invention.

Next, the operation will be described. After closing the discharge door 27 to prevent the processing liquid from being discharged, the supply pump 35 is operated to supply the processing liquid to the processing tank 10. When the machining fluid accumulates, the float 50 receives buoyancy and floats on the machining fluid level. At the same time, the machining liquid discharging means 52 also emerges. In this embodiment, bellows grow. When the preset processing tank liquid level and the height of the processing liquid discharge means 52 output from the position detection means 80 match, a signal is output from the control device to the air source 57 and the thrust control means 72 sends the signal to the cylinder. Floating 5
An air pressure corresponding to a thrust balanced with a buoyancy of zero is applied.
As a result, the lifting of the machining fluid discharging means is stopped. The machining fluid further flows in and is supplied above the machining fluid discharge means 52. When the liquid level 13 is supplied to a certain height from the processing liquid discharge means 52, the inflow liquid amount and the discharge flow rate which overflows from the processing liquid discharge means 52 and is discharged to the outside of the processing tank are balanced. The surface 13 is constantly controlled at an arbitrary position.

Embodiment 6 FIG. FIG. 6 is a schematic diagram showing Embodiment 6 of the present invention.

Next, the operation will be described. After closing the discharge door 27 to prevent the processing liquid from being discharged, the supply pump 3
5 is operated to supply the processing liquid to the processing tank 10. When the machining fluid accumulates, the float 50 receives buoyancy and floats on the machining fluid level. At the same time, the machining liquid discharging means 52 also emerges. In this embodiment, bellows grow. At this time, the float 50 and the machining fluid discharge means 52 continue to rise smoothly and accurately at the correct position by the guide means 75. When the preset processing tank liquid level and the height of the processing liquid discharging means 52 output from the position detecting means 80 match, the lifting of the processing liquid discharging means is stopped by the fixing means 55 or the cylinder 70 and the thrust control means. . The machining fluid further flows in and is supplied above the machining fluid discharge means 52.
When the liquid level 13 is supplied to a certain height from the processing liquid discharge means 52, the inflow liquid amount and the discharge flow rate which overflows from the processing liquid discharge means 52 and is discharged to the outside of the processing tank are balanced. The surface 13 is constantly controlled at an arbitrary position.

Embodiment 7 FIG. In the first embodiment described above, the processing liquid discharging means is constituted by the bellows which can be freely expanded and contracted.
As shown in the figure, a discharge pipe 91 having a float and a fixed pipe 92 fitted to the discharge pipe 91 may be used.

Embodiment 8 FIG. Also, as shown in FIG.
The same effect can be obtained by using a hose 93 having one end connected to the discharge port and the other end attached to the float.

[0033]

As described above, according to the present invention, the liquid level setting means is constituted by the machining fluid discharge means having a float and the fixing means for fixing the machining fluid discharge means at an arbitrary position. Therefore, there is an effect that the liquid level can be controlled to a predetermined set position with certainty. Furthermore, since the control range of the liquid level has no width, the position adjustment of the liquid level detecting means becomes easy. Also,
Even if the X and Y strokes of the machine body are large or small, there is no need to change the machining fluid discharge time or the position of the liquid level detection means.
Parts and control programs can be shared, and costs can be reduced. Further, the same effect can be obtained even if the liquid level is set by the liquid level detecting means.

The liquid level setting means is composed of a machining fluid discharge means having a float, a cylinder connected to the machining fluid discharge means, and a thrust control means for adjusting the thrust of the cylinder. There is an effect that the surface can be constantly and reliably controlled at the set position of the liquid level detecting means. Further, since there is no control range or width of the liquid level, the position of the liquid level detecting means can be easily adjusted. Also, depending on the magnitude of the X and Y strokes of the machine main body, there is no need to change the discharge time or the position of the liquid level detecting means, so that components and control programs can be shared and costs can be reduced.

The liquid level setting means includes a machining fluid discharge means having a float, a position detecting means for detecting a position of the machining fluid discharge means having the float, and fixing the machining fluid discharge means at an arbitrary position. Since the liquid level is constituted by the fixing means, the liquid level can be controlled to an arbitrary set position with certainty.

Further, since the liquid level setting means is provided with a guide means for guiding the machining liquid discharge means provided with a float, the discharge means can be moved up and down smoothly, and more stable and accurate liquid level control can be performed. .

[Brief description of the drawings]

FIG. 1 is a schematic view showing a wire electric discharge machine according to an embodiment of the present invention.

FIG. 2 is a schematic view showing a wire electric discharge machine according to another embodiment of the present invention.

FIG. 3 is a schematic diagram showing a wire electric discharge machine according to another embodiment of the present invention.

FIG. 4 is a schematic view showing a wire electric discharge machine according to another embodiment of the present invention.

FIG. 5 is a schematic view showing a wire electric discharge machine according to another embodiment of the present invention.

FIG. 6 is a schematic view showing a wire electric discharge machine according to another embodiment of the present invention.

FIG. 7 is a schematic diagram showing a wire electric discharge machine according to another embodiment of the present invention.

FIG. 8 is a schematic view showing a conventional wire electric discharge machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wire electrode 6 Workpiece 13 Processing liquid level 15 Liquid level detection means 50 Buoyancy generation means 52 Processing liquid discharge means 55 Fixing means 70 Cylinder 72 Thrust control means 75 Guide means 80 Position detection means

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-3-287319 (JP, A) JP-A-59-69225 (JP, A) JP-A-2-88116 (JP, A) JP-A 61-69 270023 (JP, A) Hira 4-73428 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23H 7/36 B23H 7/02

Claims (4)

(57) [Claims] In a wire electric discharge machining apparatus for processing a workpiece by immersing the workpiece in a working fluid to generate a discharge between a wire electrode and the workpiece, the workpiece is supplied with a working fluid. a buoyant generating means for generating a buoyancy and, working fluid
Fluid discharge means for making the height at which the fluid is discharged variable, and machining fluid
Liquid level detecting means for detecting the liquid level of the buoyancy.
A wire fixing means for fixing a raw means to the machining fluid discharge means, and fixing means for fixing the machining fluid discharge means at an arbitrary position when a fluid level is detected by the fluid level detection means. Electric discharge machine. 2. The wire electric discharge machine has a liquid level detecting means for detecting a liquid level of the machining liquid, and engages with the machining liquid discharging means when the liquid level is detected by the liquid level detecting means. And a fixing means for stopping the machining fluid discharge means at an arbitrary position by generating a thrust in a direction opposite to the buoyancy generated by the buoyancy generating means by the cylinder to be driven and the thrust control means for controlling the thrust of the cylinder. Characterized by
The wire electric discharge machine according to claim 1. 3. A processing liquid discharging means, comprising: a position detecting means for detecting a vertical position of the processing liquid of the processing liquid discharging means, and discharging the processing liquid when a position of the processing liquid discharging means coincides with a predetermined liquid level of the processing liquid. 請 characterized in that stopping means
Motomeko 1 wherein the wire electric discharge machining apparatus. 4. claims 1, wherein, characterized in that the slidable elevation of the working fluid discharge means provided guide means in the vertical direction of the working fluid in the working fluid discharge means to claim 3 A wire electric discharge machine according to the above.