JPS624525A - Electric discharge machine - Google Patents

Abstract

PURPOSE:To prevent machining fluid from scattering, by providing an attracting case being opposed to the surface of a work further a suction device communicating with the attracting case. CONSTITUTION:When a machine repeats a pulse discharge to perform electric discharge machining by applying a pulse between a wire electrode 1 and a work 2, machining fluid is supplied by a strong injection pressure from nozzles 3 toward a machined portion of the work 2. Here the machining fluid, outflowing from a machined part surface of the work 2 and its machined portion, it allowed to flow into an attracting case 4, being attracted by suction devices 6. The machine, forming the attracting case 4 in a dimensional shape to envelop a portion of the work 2 circulating the machining fluid, enables a spray to be sufficiently attracted and removed with no leak to the periphery.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an electric discharge machining apparatus that performs machining by repeatedly applying pulsed discharge while supplying machining liquid to a gap between an electrode and a workpiece facing each other.

[Prior art and its problems]

Conventionally, in order to prevent machining fluid from scattering during wire-cut electrical discharge machining, etc., it has been devised to provide a mesh or mat to prevent machining fluid from scattering, but these have not functioned satisfactorily.

[Means for solving problems]

The present invention was proposed to improve these points,
° A suction case having a shape and size that surrounds a portion of the workpiece through which machining fluid flows is provided opposite to the surface of the workpiece, and a suction device is provided in communication with the suction case. .

〔Example〕

The present invention will be explained below with reference to an embodiment of the drawings.

Figure 1 shows an example of wire-cut electric discharge machining, in which 1 is a wire electrode, 2 is a workpiece, and the wire electrode 1 is moved upward (or downward) with a predetermined tension by driving a brake and a tension roller (not shown). It moves continuously at high speed and faces the workpiece 2 while being updated, supplies machining fluid to the opposing gap, and processes the workpiece by repeating pulsed discharge. The machining fluid is normally injected and supplied from upper and lower nozzles 3 along the wire electrode 1 or coaxially. Reference numeral 4 denotes a suction case which is disposed opposite to the surface of the workpiece 2 through which the machining fluid is scattered with a minute gap, and is formed in a shape and dimension to surround the part of the workpiece through which the machining fluid flows. A duct 5 communicates with the space 4, and a suction device j6 is installed therein. The suction device 6 can be a suction pump, an aspirator, a suction fan, or other means.

In the above, in 1fi electric machining, a pulse is applied between the wire electrode 1 and the workpiece 2 from a machining source (not shown),
Electric discharge machining is performed by repeating pulse discharge. The machining fluid supplied from the nozzle 3 is usually pure water or an aqueous machining fluid made by adding a surfactant or the like to water, and is supplied with strong jet pressure toward the machining part of the workpiece 2 placed in the air. do. A suction case 4 is provided facing the surface of the workpiece 2 facing the nozzle 3 and the side surface of the workpiece 2 through which the machining liquid flowing out from the workpiece flows, and a suction device @6 is in communication with the suction case 4. It is. Therefore, an intake air flow acts on the opposing surface of the suction case 4 from the surroundings, and the machining liquid droplets scattered from the surface of the workpiece 2 are sucked in. Since the suction case 4 is formed in a shape and size to surround the part of the workpiece 2 through which the machining fluid flows, it is possible to sufficiently suction and remove the droplets without leaking them to the surroundings.

In addition, in wire cutting, the wire electrode 1 and the workpiece 2
The long machining parts facing each other are given relative feed according to the machining shape by NCIII control, fine control, etc., and the machining parts change as the machining progresses, but the suction case 4 facing the upper and lower machining parts is Since it maintains a small gap without contacting the workpiece 2, it is easy to move, and by moving it together with a guide (not shown) of the Lie A1 electrode 1, it constantly surrounds and sucks the workpiece, causing the work fluid to scatter. Prevention can be carried out. Of course, the suction case can be provided in contact with the surface of the workpiece. The suction device can collectively suction the ducts of each suction case with a single device.

Figure 2 shows an example of die-sinking electrical discharge machining using a machining electrode, where 1 is the electrode, 8 is the workpiece, and machining is performed by supplying machining fluid such as kerosene or water to the opposing gap and performing pulse discharge. do. The machining liquid is jetted from the jet hole 7a provided in the electrode 1. 9
A suction device 10 is provided in a suction case that covers the surface of the processed part of the workpiece 8 that the electrode 1 faces.

The machining electrode 7 is provided in a servo feeding device in vertically opposing directions, faces the workpiece 8 with a minute gap, and performs machining by applying electrical discharge to the opposing gap. The machining fluid jetted from the electrode 7 is sucked by the suction case 9, and the machining fluid droplets are prevented from scattering around.

Note that the machining fluid can be supplied by providing a supply nozzle in addition to the electrode so that the machining fluid is jetted from the nozzle.

〔Effect of the invention〕

As described above, the present invention provides a suction case having a shape and dimensions that surrounds the part of the workpiece to be subjected to electric discharge machining through which machining fluid flows. Since this is controlled, it is possible to prevent the machining fluid from scattering around. In wire cutting using a tIIi wire electrode, scattering of machining fluid is prevented, wire breakage is prevented and stable machining is possible, and if a transparent material is used for the suction case, machining can be performed while observing the inside. I can do it,
Since the scattering of machining fluid can be prevented, signal detection from the gap can be easily and highly sensitive, and the resulting control can also be accurately and stably, which has great effects.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of one embodiment of the present invention, and FIG. 2 is a diagram of another embodiment. 1...Wire electrode 2...Workpiece 3...Machining fluid supply nozzle 4...
Suction case 6 Suction device patent applicant Inoue Japax Research Institute Representative Inoue 1.

Claims (1)

[Claims] In an electric discharge machining device that performs machining by repeating pulsed discharge while supplying machining fluid between an electrode and a workpiece, a suction case with a shape and size that surrounds a portion of the workpiece through which the machining fluid flows is attached to the workpiece. An electric discharge machining apparatus characterized in that a suction device is provided facing the body surface and communicating with the suction case.