Electric heating – Metal heating – Cutting or disintegrating
Patent
1993-08-30
1994-12-20
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
219 6914, B23H 710
Patent
active
053747950
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a sealing structure for a machining liquid tank of an immersion type wire cut electric discharge machine.
BACKGROUND ART
FIG. 4 schematically illustrates a conventional immersion type wire cut electric discharge machine 1. A wire 11 is drawn from a wire reel 12 arranged on an upper arm 4a, and guided along a brake roller 13 and an upper guide roller 14 to a lower guide roller 15 arranged in a lower arm 4b. A workpiece 3 is placed in a machining liquid tank 2 between the upper and lower guide rollers 14 and 15. Electric discharge is induced between the wire 11 and the workpiece 3 immersed in a machining liquid contained in the machining liquid tank 2, thereby causing the workpiece 3 to undergo electric-discharge machining. This type of wire cut electric discharge machine is suited for a machining operation, such as an end-face machining of a thick plate, that requires a sufficient amount of machining liquid to be supplied to a discharging spot and thus, cannot be properly carried out with a nozzle jet type machine in which machining liquid is injected from a nozzle to a machining part of a workpiece.
The immersion type wire cut electric discharge machine must be constructed so that the lower arm 4b is kept projected into the machining liquid tank 2. The machining liquid tank 2 is placed on an X-Y table 5 and is moved relative to the lower arm 4b. Thus, a sealing structure must be provided at a portion A where the lower arm 4b penetrates a tank wall 6 so that the machining liquid tank 2 is allowed to move relative to the lower arm 4b without causing leakage of the machining liquid.
Specifically, the sealing structure must have a construction such that the machining liquid tank 2 can be moved in a horizontal plane in directions perpendicular to each other with respect to the lower arm 4b.
DISCLOSURE OF THE INVENTION
An object of tile present invention is to provide a sealing structure, which permits movement of a machining liquid tank relative to a lower arm and can prevent sludge from adhering to an inner surface of a slide member.
A wire cut electric discharge machine according to the present invention comprises: seal means provided at a tank wall of a machining liquid tank where a lower arm extends, and having a slide member through which the lower arm extends and a guide member for guiding the slide member while keeping the slide member in close contact with the tank wall. Additionally, nozzle means are arranged inside the machining liquid tank, for injecting a fluid toward an inner surface of the slide member.
The fluid spouted from the nozzle agitates the machining liquid in the vicinity of the inner surface of the slide member, whereby sludge is prevented from adhering to the inner surface of the slide member.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a horizontal sectional view of a principal part of a wire cut electric discharge machine according to one embodiment of the present invention;
FIG. 2 is a vertical sectional view of the wire cut electric discharge machine shown in FIG. 1;
FIG. 3 is a horizontal sectional view showing a sealing structure for a machining liquid tank; and
FIG. 4 is a partially sectional front view of a conventional electric discharge machine.
BEST MODE OF CARRYING OUT THE INVENTION
Referring to FIG. 3, an immersion type wire cut electric discharge machine has a lower arm 4b penetrating a tank wall 6 of a machining liquid tank 2. A sealing structure 7 is provided at a portion of the machine where the lower arm 4b penetrates the tank wall 6.
The sealing structure 7 is composed of a slide seal, which permits movement of a machining liquid tank 2 in a Y direction relative to the lower arm 4b while sealing the gap between the tank 2 and the arm 4b, and a bellows 8, which permits movement of the machining liquid tank 2 in an X direction relative to the lower arm 4b while sealing the gap between the tank 2 and the arm 4b.
The slide seal includes a guide mechanism, which is formed by a groove 9 in the tank wall 6 throug
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Evans Geoffrey S.
Fanuc
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