JPS6029227A - Wire-cut electrical discharge machining device - Google Patents

Abstract

PURPOSE:To stabilize the pressure of machining liquid with a simple structure, so that a wire from being cut in order to enhance the accuracy of machining, by providing a resilient member for urging both nozzles which are opposed together through the intermediary of a workpiece, toward the workpiece so that the front ends of the nozzles are always press-contacted to the workpiece. CONSTITUTION:Upper and lower nozzles 5, 6 are always urged toward the workpiece 2 side by means of springs 10 disposed between dice steps 4 so that the front ends of the nozzles 5, 6 are press-contacted to a workpiece 2. As a result, machining liquid indicated by arrows (a) is fed into the workpiece 2 without its pressure being reduced, so that machined dust are surely discharged. Further, although there may be elongated the upper nozzle 5, axially thereof due to thermal deformation upon machining, the elongation may be absorbed by the compression of the springs 10 so that defects in machining will not occur in association with restriction to the motion, and since the front ends of the nozzles 5, 6 are press-contacted to the workpiece, the set heights of both nozzles 5, 6 are surely made equal together only by setting the workpiece 2.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a wire-cut electric discharge machine, and particularly relates to an improvement of a machining fluid nozzle thereof. This figure shows the wire cutting head section of a wire-cut electric discharge machine. An upper nozzle 5 and a lower nozzle 6 for supplying machining liquid to the hole during machining, as indicated by arrow a in FIG. A nozzle cap 10 is attached to each of the nozzles 6 and 6.

The lower nozzle 6 and the nozzle cap 7 integrated therewith
As shown in Fig. 1, the dowel pin 8 allows the die holder to slide only in the direction indicated by the arrow with respect to the die 4, and as shown in the right half of Fig. 1 It can be slid downward to hold two workpieces between the upper nozzle 5 and the upper nozzle 5, and when performing wire threading operations, as shown in the left half of Figure 1, it can be slid downward in the figure to hold two workpieces from the workpiece 2. is now possible. During this wire threading operation, the six lower nozzles can be temporarily fixed with the lock nut 9.6 In the above configuration, when the upper nozzle 5 is fixed without providing a gap between it and the workpiece 2, When thermal deformation occurs during machining, movement may be restricted and machining defects may occur.

Therefore, in the past, a gap C was previously provided between the tip of the upper nozzle 5 and the workpiece 2, as shown in FIG. 1, so that the movement would not be restricted even if thermal deformation occurred.

However, when a gap C is provided between the tip of the upper nozzle 5 and the workpiece 2, the machining fluid flows from the gap C? During machining of Urarero L, not enough fluid pressure was applied to the 0 hole, and the machining waste could not be discharged and the wire broke? There is a risk of being arrested.

In addition, if the height setting of the upper p1b nozzle 5 is not easy and the height setting is appropriate, the 5 V
Machining with good Cjm degree can be expected, but if the upper nozzle 5 is too high, the upper dimension of the workpiece 2 will be smaller than the lower dimension as shown in Fig. 2 (a), and the reverse will occur. If the upper nozzle 5 is lowered too much, the upper dimension of the workpiece 2 becomes larger than the lower dimension, as shown in FIG. 2(e), and variations in the dimensions of the workpiece 20 occur. There are also problems.

[Purpose of the invention]

The present invention was made in view of the current situation, and even if thermal deformation etc. It can be sufficiently absorbed, and the machining fluid pressure can be stabilized without creating a gap between the workpiece and the nozzle, thereby preventing wire breakage and increasing the machining load by 1LjJ. A wire-cut electrical discharge machine that can be easily set up without requiring any experience. Do you have one thing in common? Purposefully.

[Summary of the invention]

Is the present invention intended for the above purpose? As a means of achieving this, two nozzles are placed opposite to each other with the workpiece interposed in between, and the workpiece is biased with a 9-force member that presses the tip of the nozzle and constantly presses against the workpiece. and 1″.

[Embodiments of the invention]

An embodiment of the present invention will be explained below with reference to FIG.

In the figure, reference numeral 1 indicates a machining wire for carving a workpiece 2, and both ends of this machining wire 1 are connected to a diamond die 3.
and both diamond dice 3
The die supports are each supported and fixed by gold 4. As shown in Figure 3, on the outer periphery of each diamond die 3, machining fluid is supplied to the hole during machining as indicated by arrow a. A fixed upper nozzle 5, a lower nozzle 6, and a nozzle cap 7 integral with these are respectively arranged. Each nozzle 5, 6 can be slid only in the direction indicated by the arrow in the figure by means of a dowel pin 8, whereas each die holder has a metal 4.
The spring 10 interposed between
tllll is constantly energized, and the tips of each nozzle 5.6 are brought into pressure contact with the workpiece 2.

Further, as shown in FIG. 3, during the wire tracing operation 1/E, the lower nozzle 6 and the nozzle cap 7 integrated therewith are slid against the biasing force of the spring 10. A lock nut 9 is provided for temporarily fixing the cap 7 at a position 16 separated from the workpiece 2.

In addition, the tip surfaces of both nozzles 5 and 6 are rounded as shown in Fig. 13, and are designed to minimize the resistance caused by contact with the workpiece '+jIJ2. .

Next, the action will be explained.

The upper nozzle 5 and the lower nozzle 6 each have a spring 10
is biased toward the workpiece 2 side. For this reason, the tip of each nozzle 5.6 is constantly pressed against the workpiece 2 during machining, and as a result, the machining fluid remains as it is without being depressurized, as indicated by arrow a in Figure rP-3. Workpiece 2 with the hydraulic pressure of
Processed waste supplied inside? I'm sure it can be ejected.

In addition, the upper nozzle 5 may be thermally deformed by the heat during machining and elongate in the ℃ axis direction, but the deformation is reliably absorbed by the compression of the spring IO as shown in the first half of Figure 3. There is no risk of machining defects due to movement restrictions.

In addition, since the tips of the upper and lower nozzles 5.6 are in pressure contact with the workpiece 2 as described above, the set height of both nozzles 5.6 is set only when the workpiece 2 is set. It will definitely be the same without requiring any special operations.

For this reason, it is easy to control the upper and lower hydraulic pressures and improve machining accuracy.
Same as above.

Further, since the contact surfaces of both nozzles 5 and 6 with the workpiece 2 are rounded, the resistance associated with contact can be extremely reduced.

In the example #i, each nozzle has 5.6 pieces of workpiece 21.
A coiled spring 1 is used as a biasing force f on i11 and 5 means.
0? As long as the stone used can be similarly biased (for example, a leaf spring or other elastic member may be used).

〔Effect of the invention〕

J: Sea urchin as described above, the present invention uses an elastic member to form a nozzle tip.
41 Silica machining ・Since it is in constant pressure contact with the object, it is possible to easily and reliably press the workpiece (directly to the ceramic), and the machining fluid pressure can be controlled evenly from top to bottom to prevent chip evacuation problems during machining. This can effectively prevent wire breakage caused by wire breakage.

Also, since there is no imbalance in the clearance between the upper and lower nozzles,
Machining accuracy is the same as above and always constant.) - You can expect it. In addition, the thermal deformation of the upper nozzle can be absorbed by the elastic member, so the f! j! There is no possibility of machining defects due to J.

In addition, it is free from the effects of machining distortion, non-uniform workpiece ζ/blade thickness, profile and setup errors, etc. that tend to occur during machining of large objects and machining of gentle shapes + 7'), resulting in large machining defects and pitfalls. You can go with one friend.

[Brief explanation of the drawing]

Figure 1 shows the wire cut head part in conventional wire cut processing 7, 7? Illustrated ￥1 analytical surface drawing, y 21gt (
a) to CC) are the nozzle foot height and the processing height jW and θ
)la Explanatory diagram showing 4 threads, Figure 3 is the present invention.
7i1i <711 It is a sectional view of -r, which corresponds to Figure 1 of the car. DESCRIPTION OF SYMBOLS 1... Processing wire, 2... Workpiece, 5... Upper nozzle, 6... Lower nozzle, 8... Knock bottle, 9...
...Lock nut, 10...Spring, a...j
Jl” upper liquid. Figure 1 Figure 2 (nl Figure 3

Claims (1)

[Scope of Claims] 1. In a wire-cut electrical discharge machine equipped with an upper nozzle and a lower nozzle that are provided in pairs on both sides of the workpiece and supply machining fluid to the workpiece, both nozzles are connected to the workpiece. 1. A wire-cut electrical discharge machine as set forth in f., characterized in that an elastic member is provided to apply a bias force to constantly press the nozzle tip to the workpiece. 2. The wire cut single home processing machine according to claim 1, wherein the lower nozzle is provided with a lock nut for temporarily fixing the lower nozzle during wire threading operation.