JPH01321122A - Wire type electric discharge machining device - Google Patents

Abstract

PURPOSE:To eliminate risk of deformation of a lower arm by fixing a frame of a machining liquid sputtering preventive means to a holding means, wherein this sputtering preventive means is penetrated by the lower arm of a lower wire guide means, and transmitting the motion to the winding/unwinding part of bellows through a belt. CONSTITUTION:When the machining advances sideways of a lower arm 26, one side of bellows 34 of a sputtering preventive means 28 stretches with movement of a table while the other side shrinks, wherein the external force acts on a holding means 40 through a frame 32, not being transmitted to the lower arm. At the same time, this external force rotates a pulley 51 forcedly through a belt 52, and extends and shrinks the bellows 34 with shaft rotation of a wind shaft part 50 as an aid to the winding/ unwinding force of a spiral spring on the wind shaft part 50. When the machining advances or retracts in the longitudinal direction of the lower arm 26, the above- mentioned holding means 40 expands or contracts along a guide 42 so as to hold the frame 32 of the machining liquid sputtering preventive means 28. This hinders external force from application to the lower part and eliminates risk of relative dislocation of upper and lower wire guide means 14, which allows performing a high accuracy processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wire electrical discharge machining apparatus, and more particularly to an external force blocking structure for a lower arm of the apparatus.

[Prior Art] FIG. 4 is a perspective view schematically showing the overall configuration of a conventional wire electric discharge machining apparatus, and FIG. 5 is a plan cross-sectional view thereof. In the figure, (10) is a wire electrode, which is guided by the upper wire guide means (12) and the lower wire guide means (14) and freely slides upward or downward with respect to the workpiece (1B). . A surface plate (18) is installed above the processing tank (20) and holds the workpiece (1B).

(22) is an upper arm that is located above the workpiece (IB) and holds the upper wire guide means (12), and is fixed to the machine body column (24). A lower arm (26) is located below the workpiece (1B) and holds the lower wire guide means (14) in a position facing the upper wire guide means (12). (28) is a scattering prevention means that prevents the machining liquid (generally water) spouted from the upper wire guide means (12) and the lower wire guide means (14) from scattering, and is directed against the lower arm (2B). Seal (3
The bellows (34) is attached to a frame body (32) which is slidable in the longitudinal direction of the lower arm (2B) via the frame body (32) through the frame body (32) via the frame body (32), and is constituted by a winding-type bellows (34) made of a stretchable thin plate.

Next, this effect will be explained. When processing the workpiece (16), the wire electrode (lO) is continuously fed from top to bottom or from bottom to top by a wire feeding system (not shown). On the other hand, the workpiece (1B) is moved relative to the wire electrode (10) by an X-Y cross table (not shown) via a processing tank (20) that loads and holds the workpiece and a surface plate (18). . Therefore, when processing,
Move the table (not shown) and wire electrode (10
) and the workpiece (1B) are placed opposite each other so as to form a minute gap, and a machining fluid ejected from the upper and lower wire guide means is supplied to the gap, and the wire electrode (
When a discharge explosion is generated between the wire electrode (10) and the workpiece (1B), the wire electrode (10) and the workpiece (IB
) part of both is blown away. At this time, the wire electrode (
10) is fed continuously so there is no cutting,
The workpiece (1B) can be processed into a desired shape by moving the table in any direction.

During this machining, even if the spouted machining fluid flows along the lower arm, the sealing member (30) prevents it from scattering (
28) is collected in the processing tank (2o) without leaking to the outside.

[Problems to be Solved by the Invention] In the conventional wire electric discharge machining apparatus as described above, when the table moves laterally during machining, the

The external force generated when the bellows (34) expands and contracts and the bellows (3)
The external force of winding and unwinding in step 4) acts directly on the lower arm (26), and as shown in Figure 6, the lower arm (2B) is deformed in the lateral direction, and as a result, the lower arm (2B) is held by the lower arm (2B). eX in the vertical relative position of the lower wire guide means (14) and the upper wire guide means (12).

There was a problem in that an error in eY occurred and the wire electrode (lO) was tilted, resulting in poor processing accuracy.

The present invention has been made to solve these problems, and provides a wire electrical discharge machining device that eliminates the external force acting on the lower arm from the scattering prevention means and prevents a decrease in machining accuracy caused by deformation of the lower arm due to external force. The purpose is to obtain.

[Means for Solving the Problems] The present invention provides a wire electrical discharge machining device equipped with a machining fluid scattering prevention means consisting of a frame body through which a lower arm passes, and a bellows wound around the left and right sides of this frame body and wound around an unwinding part. The power transmission means includes a holding means whose base part is supported by the machine body, winds the belt around a pulley provided on the shaft of the winding and unwinding part, and connects both ends of the belt with both sides of the holding means. Provided is a wire electrical discharge machining device having the following.

[Function] In the present invention, the external force generated by the movement of the table is transmitted from the holding means to the main body via the frame of the machining liquid scattering prevention means. Further, the external force transmitted from the frame to the bellows is transmitted to the bellows winding and unwinding section via the belt and pulley to rotate the shaft, completely blocking the action of external force on the lower arm.

[Embodiment] Fig. 1 is a perspective view showing the overall configuration of an embodiment of the Kyo invention, Fig. 2 is a sectional plan view of the lower arm and machining fluid scattering prevention means of Fig. 1, and Fig. 3 is a cross-sectional plan view of the lower arm of Fig. FIG. 3 is a perspective view showing main parts. It should be noted that the same reference numerals as in the conventional device described above indicate the same thing. (40) is the frame (32) of the machining fluid scattering prevention means (28).
) is a holding means that holds the guide (42) from left and right.
Although the lower arm (2B) is slidable in the longitudinal direction along the lower arm (2B), the lateral displacement of the lower arm (2B) is restricted. Next, in Figure 3, (50) is a bellows (34
) is the winding shaft part for winding and unwinding, (51) is the winding shaft part (5
The pulley (52) is located on the same axis as the boo 9 (
51), and both ends of the belt are connected to both sides of the holding means (40).

Next, this effect will be explained. When processing progresses in the lateral direction of the lower arm (2B), one of the bellows (34) of the anti-scattering means (28) expands and the other contracts as the table (not shown) moves. At this time, this external force acts on the holding means (4o) via the frame (32) and is not transmitted to the lower arm (26).

At the same time, this external force forcibly rotates the pulley (51) via the belt (52), thereby causing the winding shaft (50
) rotates to expand and contract the bellows (34).

By rotating the belt (52) in this way, the pulley (5) is forcibly rotated, thereby causing the winding shaft (5) to rotate.
0), it acts to help the winding and unwinding force of the coiled spring, so the proof stress of the spring can be maintained for a long time.

When machining moves forward and backward in the longitudinal direction of the lower arm (2B), the holding means (40) expands and contracts while being guided by the guide (42), thereby preventing the machining liquid from scattering (28).
) can hold the frame body (32).

In the above-mentioned embodiment, the case where the machining fluid is supplied by jetting has been described, but the same effect can be obtained even if the present invention is applied to a type in which the machining fluid is stored in a machining tank and the workpiece is immersed in the machining fluid.

Further, in the above embodiment, the lower arm is fixed at one end in a cantilever type, but the present invention can also be implemented in a case where the lower arm is fixed at both ends in a gate-shaped structure, for example, in a double-sided type. .

[Effects of the Invention] As described above, according to the present invention, the frame of the machining fluid scattering prevention means through which the lower arm passes is fixed to the holding means, and the movement of the machining fluid scattering prevention means is controlled by bellows via a belt and a pulley. Since the information is transmitted to the winding and unwinding section, there is no risk that the machining fluid scattering prevention means will apply external force to the lower arm and cause it to deform. Therefore, the vertical relative positions of the upper wire guide means and the lower wire guide means There was no misalignment, and the effect was that highly accurate wire electrical discharge machining could be performed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the overall configuration of an embodiment of the present invention, FIG. 2 is a sectional plan view of the lower arm and machining fluid scattering prevention means shown in FIG. 1, and FIG. 3 is a perspective view of the machining fluid scattering prevention means. 4 is a perspective view of the overall configuration of the conventional example, FIG. 5 is a cross-sectional plan view of FIG. 4, and FIG. 6 is a cross-sectional plan view showing one state during operation. In the figure, (10) is a wire electrode, (12) is an upper wire guide means, (14) is a lower wire guide means, (
16) is the workpiece, (26) is the lower arm, (28)
(30) is a seal, (82) is a frame, (34) is a bellows, and (52) is a belt. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A frame body through which a lower arm is slidably passed, and a pair of bellows each having one end connected to the frame body and the other end wound around a winding and unwinding part disposed on both sides of the frame body. A machining fluid scattering prevention means consisting of a holding means whose tip part holds the frame body and whose root part is supported by the main body; A wire electric discharge machining apparatus characterized in that the wire electrical discharge machining apparatus comprises a power transmission means connected to the holding means.