JPH0346247B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a wire guide device for a wire-cut electrical discharge machine. As shown in FIG. 18, the conventional wire-cut electrical discharge machine guides and transfers the electrode wire 3 between an upper guide roller 1 and a lower guide roller 2, and a wire made of sapphire is placed between the guide rollers 1 and 2. An upper guide 4 and a lower guide 5 are provided, and the wire 3 is fitted into the vertical grooves 6 and 7 on the front surfaces of the upper and lower guides 4 and 5 to move in one direction between the upper and lower guides 4 and 5. For example, a workpiece 8 such as a press cutting die is arranged, and a through hole 9 passing through the workpiece 8 vertically is provided.
The wire 3 is passed through the through hole 9, and the wire 3 is energized by the energizing piece 11 while the machining liquid 10 is applied to the wire, and a pulse voltage is applied from the machining power source during the machining process formed in the through hole portion 9. While applying pulsed discharge, electric discharge machining was carried out into the desired shape using discharge heat. However, as shown in FIG. 18, the upper guide 4 and the lower guide 5 used in the above-mentioned known wire-cut electric discharge machine have groove bottoms in contact with the wire 3 having a vertical arc shape, so that they can be connected vertically to the wire 3. The contact area with the guides 4 and 5 was increased to prevent wear of the sapphire. In addition, the beak tube for spouting machining fluid onto the wire is separate from the guide and is installed in the direction that intersects the wire, so if the jetting pressure is increased, it will not flow in the direction of the wire, and if the jetting pressure is lowered, it will not flow in the direction of the wire. Then, the machining fluid can be flowed in the direction of the wire, but the pressure that can be used to flush out the machining debris caused by the pulse discharge from the workpiece cannot be obtained, and the method of jetting the machining fluid from the lateral direction of the wire 3 is not suitable. However, a sufficient removal effect of processing debris could not be obtained. Further, when the workpiece is a press cutting die or the like, it is necessary to form a slight taper at the top and bottom of the machined surface to facilitate die cutting. In this case, in the conventional wire-cut electric discharge machine, one of the upper and lower guides 4 and 5 is moved as shown in FIG. It was moving in the direction. In this case, the contact portion of one of the upper guides of the wire 3 moves from the end of one of the upper guides 4 to the middle part, and depending on the amount of movement of the one of the upper guides 4, the contact part of the wire 3 and the upper guide 4 move. The contact portion of the upper guide 4 moves along an arc and its moving point is indeterminate. Therefore, it is troublesome to calculate the amount of movement of the upper guide 4 to give the wire 3 the desired inclination. In the case where the inclination is applied to 3 by moving both the upper guide 4 and the lower guide 5, it becomes more difficult to determine the amount of movement.

Therefore, by making the upper and lower guides a nozzle-type guide in which a die-shaped guide is coaxially provided at one end of a cylindrical member with open ends, the nozzle-type guide that guides the wire 3 can be moved in the X and Y axes at right angles to each other. We tried to prevent the contact point between the wire 3 and the guide stone from moving in the vertical direction even when the wire 3 is moved, but some wire diameters are as thin as 0.05 mm, and the guide stone of the nozzle-type guide that guides them Since the diameter of the hole was small, it was difficult to pass the wire 3 through the hole in the guide stone. Therefore, the present invention has been made with the object of providing a nozzle-type guide for a wire-cut electric discharge machine through which the wire 3 can be easily passed.

In order to achieve the above object, the wire guide device of the present invention has a cylindrical shape with both ends open, a dice-shaped guide coaxially provided on one end side, and a notch on the side near the guide. A cylindrical space is formed between the nozzle type guide and an outer circumferential surface that coaxially surrounds the nozzle type guide and excludes the other end of the nozzle type guide, and the end on the one end side is arranged so as to form a cylindrical space. It communicates with the cylindrical space and opens coaxially with the nozzle type guide, has a machining fluid supply hole on the side that communicates with the cylindrical space, and has a notch in a portion facing the notch of the nozzle type guide. a cylindrical hollow case having a cylindrical shape having both ends open, surrounding the hollow case, supported by the hollow case so as to be rotatable about an axis of the hollow case, and facing the notch of the hollow case; a hollow cap having a notch on a side thereof, and a size and shape that fits into the notch of the hollow case, and is fixed by rotation of the hollow cap in a state fitted to the notch of the hollow case. It is characterized by consisting of a cutout piece.

As shown in FIGS. 1 to 6, a hollow cap A is screwed into a hollow case B, and the hollow case B and the hollow cap A are provided with hollow parts 32 and 27 that communicate with each other, and a nozzle mold is installed in this hollow part. A guide C is fixed through the nozzle C, and a gap 50 is provided between the periphery of the nozzle C and the hollow part 27 of the cap A. That is, as shown in FIGS. 12 to 14, the cap A has a cylindrical shape with both ends open, and has a threaded portion 21 on the inner periphery at the bottom for threaded connection to a hollow case B, which will be described later. A base 23 is provided with a knurling 22 at the top, and a notch 24 is provided above the base 23 to provide an upright part 25 having a planar arc shape. A U-shaped groove 26 is provided. Also, a hollow portion 27 is provided in the center.

As shown in FIGS. 15, 16, and 17, the hollow part 32 of the hollow case B has a base 31 with an inner diameter that allows the base 41 of a nozzle-type guide C, which will be described later, to fit therein. Small diameter part 33 at the top
A hollow portion 34 having a smaller diameter than the inner diameter of the hollow portion 32 and opening coaxially with the nozzle type guide C.
A notch 49 (described later) of the nozzle type guide C is provided.
A notch 35 is provided at a portion facing the. When the cap A is screwed and fixed to the upper part of the hollow case B, the small diameter part 33 of the hollow case B becomes the upright part 25 of the cap A.
The notch 35 of the hollow case B overlaps the notch 24 of the cap A. This notch 35 has the parts shown in FIGS. 4, 5, and 6.
As shown in the figure, a cutout piece 36 is fitted into the cutout portion 35 and has an inner and outer diameter, an arcuate portion, a notch width, and a shape that can be formed into a planar hollow cylindrical shape together with the small diameter portion 33. Provided separately. Above cutout piece 3
A flange 37 protruding outward is provided on the outer lower edge of the cap A when the cutout piece 36 is fitted into the cutout 35 of the hollow case B.
The size and shape are determined so that it can fit into the groove 26 having a U-shaped cross section. A machining fluid supply pipe 37' is attached above the base 31 of the hollow case B to communicate with the hollow part 32. 38 is a screw for screwing the cap, and 39 is a screw hole.

As shown in FIG. 7, FIG. 8, and FIG. 9, the nozzle type guide C has a cylindrical shape with both ends open as a whole, and has a base 41 with an outer diameter that is fitted into the hollow part 32 of the hollow case B, and a base part A seat part 42 is located below the base, a small diameter part 43 is located above the base and near the opening of the machining fluid supply pipe 37', and a truncated conical beak part 4 is provided at the tip of the small diameter part.
4 is formed, and a recess 45 is provided on the end face of the beak, and a dice-shaped guide stone 46 such as sapphire is provided in this. A wire insertion hole 47 is provided that passes through the guide stone and vertically through the nozzle type guide C. 4
8 is a screw groove. Further, the side surface of the beak portion 44 above the small diameter portion 43 is cut out to expose a portion of the wire insertion hole 47 of the beak portion 44 as a notch portion 49 .

10 and 11 show examples in which the guide stones 46 are installed in different directions, with FIG. 10 showing the guide on the feeding side and FIG. 11 showing the guide on the feeding side.

To assemble the nozzle type guide C, hollow case B, and hollow cap A configured as above, the first step is to assemble the nozzle type guide C, hollow case B, and hollow cap A.
As shown in Figures 2 and 3, hollow case B
Inside there is a beak part 44 of a nozzle type guide C, a small diameter part 43,
The base 41 is inserted, and the screw 51 is screwed into the screw hole 39 of the hollow case B toward the screw stopper groove 48 to fix the nozzle type guide C and the hollow case B coaxially. As a result, a cylindrical space is formed between the outer peripheral surface of the nozzle-type guide C excluding the base 41 and the inner peripheral surface of the hollow case B. The cap A is placed on the upper part of the hollow case B, and the former cap screw 38 and the latter screw part 21 are screwed together, and the notches 49, 35,
24 so that they overlap.

Also in this invention, the wire 3 is guided between the upper guide roller 1 and the lower guide roller 2, and the wire guides of the present invention are arranged vertically and guided between them, and the workpiece 8 is guided vertically. A through hole 9 is provided, and the wire 3 is passed through the through hole, and the wire is energized by an energizing piece while spouting machining fluid onto the wire, and discharge heat is generated while pulse discharge is generated in the through hole portion. Electric discharge machining into a desired shape is performed in the same manner as in a known wire cut electric discharge machine. In the present invention, the wire 3 passing through the upper roller 1 is inserted into the wire insertion hole 47 on the seat 42 side of the nozzle type guide C above the workpiece 8.
The tip of the wire 3 is taken out from the notch 24 of the cap A, the notch 35 of the hollow case that overlaps with it, and the notch 49 of the nozzle type guide C, and the tip of the wire 3 is inserted into the guide stone 46 again.
through the through hole 9 of the workpiece 8, and the second
Insert from the tip of the guide stone 46 of the nozzle-type guide C of the lower guide shown in the figure, and cut out the overlapping notch 2.
4, 35, 49 and the wire insertion hole 47 again.
It passes through in the direction of the seat 42 and is guided to the lower guide roller 2 and tensioned. After that, the notch piece 36 is placed in the notch part 35 of the hollow case B, the notch part 35 is closed, the cap A is rotated to cover the notch piece 36, and the flange 3 of the notch piece is inserted into the U-shaped groove 26.
7 and press the flange 37 to remove the cutout piece 3.
Fix 6. As described above, according to the present invention, the notches 24, 35, 49 provided near the guide stone 46
Since it is possible to pass the wire 3 while looking inside from the inside, the wire can be easily passed through the center hole even if a die-shaped guide is used.

Further, in this invention, the machining fluid supply pipe 37'
The machining fluid taken in from the hollow case B passes between the inner wall of the hollow case B and the small diameter part 43 of the nozzle type guide C through 50, and then passes between the hollow part 34 of the hollow case B and the beak part 44 and the notch of the nozzle type guide C. 49 and wire 3
is ejected in the insertion direction. Therefore, according to the present invention, machining fluid can be jetted out at high pressure to supply a sufficient amount of machining fluid during machining, to remove machining debris well and to sufficiently cool the machining part. .

As mentioned above, the conventional boat-shaped upper guide and lower guide are replaced by nozzle-type guides, and because the nozzle-type guide guides the wire, the upper and lower guides are used to tilt the wire in order to make the machined surface of the workpiece taper. Since the contact portion of the wire does not move up or down no matter which guide is moved, it is possible to accurately and easily impart a predetermined inclination to the wire. Furthermore, according to the present invention, when initially tensioning the wire, or when cutting and re-stretching, the wire can be operated from the notch of the nozzle-shaped guide, so even if a die-shaped guide is used, the wire can be easily stretched. Can be stretched. Further, since the machining fluid can be ejected from the periphery of the beak in the direction of wire insertion, strong pressure can be applied, and the removal of machining debris by the machining fluid is extremely effective. Further, according to the present invention, after the wire is inserted into the guide device by operating the wire from the notch, the notch is closed by the notch, and by further rotating the cap, the notch is inserted into the notch. Since they are fixed in the fitted state, the machining fluid will not leak from the notch, and the machining fluid can be supplied to the machining section without waste.

[Brief explanation of drawings]

Fig. 1 is a plan view of the present invention, Fig. 2 is a longitudinal sectional view of the invention, Fig. 3 is a right side view of Fig. 2, Fig. 4 is a plan view of the cutout piece, and Fig. 5 is a plan view of the cutout piece. Front view, Figure 6 is a perspective view of the cutout piece, Figure 7 is a vertical cross-sectional view of the nozzle type guide, Figure 8 is a right side view of the nozzle type guide, and Figure 9 is along the line X-X in Figure 7. 10 is an enlarged vertical sectional view of the beak of the upper guide, and 11 is a cross-sectional view.
The figure is an enlarged longitudinal sectional view of the beak of the lower guide, Fig. 12 is a plan view of the cap, Fig. 13 is a longitudinal sectional view taken along the Y-Y line in Fig. 12, and Fig. 14 is a right side view of Fig. 13. , FIG. 15 is a plan view of the hollow case, FIG. 16 is a longitudinal sectional view taken along the line Z-Z in FIG. 15, FIG. 17 is a right side view of the hollow case, and FIG. 18 is a side view showing a known wire guide. It is a diagram. A...Hollow cap, B...Hollow case, C...
... Nozzle type guide, 24, 35, 49 ... Notch, 36 ... Notch piece, 37' ... Processing liquid supply pipe.

Claims (1)

[Claims] 1. A nozzle type guide having a cylindrical shape with both ends open, a die-shaped guide coaxially provided at one end and a notch on the side near the guide, and a nozzle type guide coaxially surrounding the nozzle type guide. A cylindrical space is formed between the guide and the outer peripheral surface excluding the other end thereof, and the end on the one end side communicates with the cylindrical space and opens coaxially with the nozzle type guide, A cylindrical hollow case having a machining fluid supply hole communicating with the cylindrical space on the side and a notch at a portion facing the notch of the nozzle type guide, and the hollow case having a cylindrical shape with both ends open. a hollow cap that surrounds and is rotatably supported by the hollow case around an axis of the hollow case, and has a notch on a side opposite to the notch of the hollow case; and a notch of the hollow case. A wire guide device for a wire cut electrical discharge machine, comprising a notch piece having a size and shape that fits into the notch part of the hollow case, and is fixed by the rotational movement of the hollow cap while being fitted into the notch part of the hollow case.