JP2506276Y2 - Wire-cutting device for unmanned electric discharge machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a wire cutting device attached to an unmanned wire electrode electric discharge machine.

[Conventional technology and its problems]

Conventionally, in an electric discharge machine that uses a wire electrode, a wire as an electrode is constantly moved by a delivery reel and a take-up reel, and the wire electrode,
A method has been performed in which a predetermined hole is formed in the die by moving the machining table while causing an electric discharge between the die and a plastic molding die fixed on the machining table. Japanese Patent Publication No. 52-24719, Japanese Patent Publication No. 53
-26720, Japanese Patent Publication No. 53-44078). In addition,
This delivery reel (wire bobbin) generally has a wire diameter of 0.2 mm and is wound for about 5 km.
Since the capacity is such that it can be processed day and night, unmanned operation can be performed day and night.

Recently, in such a wire electrode electric discharge machine, the used wire unwound from the nip roller of the machine is not wound onto a take-up reel, but directly from the nip roller.
The wire receiving containers are sequentially stored in a drop-like manner.

And, since this used wire cannot be reused as it is, it is used after being melted and regenerated.Therefore, in the method of winding with a take-up reel, it takes time to regenerate, so the above-mentioned free-floating method is used. It is regarded as an advantage. Moreover, if the wire electrode electric discharge machine is configured to have an automatic wire connecting function, it is generally unavoidable to use the drooping method.

However, in the case of such a running-off method, if the used wire is continuously stored in the wire receiving container, the accumulated space volume of the wire occupies a large amount, so that this container is filled in a short time and overflows, and In this case, the wire may be sequentially lifted and may become entangled in the nip roller of the wire electrode electric discharge machine.

Therefore, during the operation of the wire electrode electric discharge machine, the operator needs to monitor the flow of the used wire for a long time (for example, day and night as described above), which is a factor that prevents complete unmanned operation. Was becoming.

Therefore, in the conventional technique, a used wire is passed between a pair of gear-shaped rollers to form a jagged wavy shape on the wire to shorten the apparent length of the wire. However, the space volume occupied by the accumulated wires is still large and fills the wire receiving container in a short time.

It is also possible to sequentially cut the used wire with a knife type or nipper type wire cutter, but with these wire cutters, although the diameter of the electrode wire is about 0.2 to 0.3 mmφ, it is for electrical discharge machining. The brass wire has a short life because it is hard and sparks are generated at the time of cutting.

Therefore, in order to solve the inconvenience of the conventional technique, the present inventors adopted a wire cutting device composed of a fixed blade and a rotary blade, and let the used wire flow down along the side surface of the fixed blade. , A wire cutting device for cutting the wire between a fixed blade and a rotating blade to cut the wire into a chip-shaped length (for example, 60 mm) was prototyped.

However, in the wire electrode electric discharge machine, an automatic wire connection device (when the wire is cut for some reason, such as during unattended operation, the cut preceding wire is fed out of the machine by a pinch roller, and a new wire that follows is cut off. Is inserted through the electric discharge machine and equipped with a device that automatically bites into the pinch roller, the wire that has been inadvertently cut will no longer be fed out by the pinch roller. The preceding wire is
The wire stays on the wire cutting device, hinders the movement of a new wire following the wire cutting device, and hinders the unmanned electric discharge machine. Moreover, the wires cut into chips by the rotary blade may be scattered, and the wires may damage the components of the apparatus.

On the other hand, Japanese Utility Model Laid-Open No. Sho 61-85320 proposes a wire cutting device for an electric discharge machine that bites a wire sent from a pinch roller between meshing spur gears and cuts it into chips.

However, in the proposed wire cutting device,
There was a problem that the gears would be damaged and expensive if they were to be replaced.

In addition, Japanese Utility Model Laid-Open No. 59-171031 discloses a transparent blade consisting of a fixed blade having a funnel-shaped through hole and a concave shape on the lower surface, and a plate-shaped movable blade that swings within the concave shape of the fixed blade. There has been proposed a wire cutting device for a wire electrode electric discharge machine which cuts a wire hanging from a hole into a chip shape with a movable blade.

However, in the proposed wire cutting machine, a vertical movable wire is cut by a plate-shaped movable blade that horizontally swings, so that the cutting portion acts on the wire at once and damage to the cutting portion is quick. In particular, since the fixed blade and the movable blade both have a special shape, there is a problem that the replacement cost is high for a wire cutting device that requires frequent replacement.

[Means for solving the problem]

Therefore, the present invention has been devised in order to solve these problems, and the gist thereof is a wire electrode electric discharge machine with an automatic wire connection device and a wire discharged from the wire electrode electric discharge machine. In a wire cutting device for cutting a sheet into chips, a feed roller consisting of a pair of rollers is interposed directly above the wire cutting device consisting of a rotary blade and a fixed blade. The fixed blade, in which a linear blade portion is provided on one side below and a wire flowing down through a funnel-shaped guide groove is arranged along a surface on the side where the blade portion is formed, is formed into a ceramic parallelogram rectangular parallelepiped. The rotary blade fixed to the fixed blade holder with a bolt, provided with a linear blade portion on one upper side and rotating in close proximity to the fixed blade blade portion, is a ceramic parallelogram rectangular parallelepiped. Fixed to the cutout surface of the rotary shaft having a horizontal shaft core with a bolt, and the fixed blade blade part with respect to the rotary blade part is orthogonal to the surface including the flowing wire and the horizontal shaft core of the rotary shaft. Seen from the side, these blade extension lines intersect, each tip side of the rotary blade blade and the fixed blade blade is polymerized through a gap that prevents the wire from escaping,
In addition, the wire hanging substantially orthogonal to the fixed blade part is cut in cooperation with the rotary blade and is tilted at a depression angle having an angle such that it obliquely cuts with respect to the axis of the wire and rotated with respect to the fixed blade part. Looking at the blade portion from the flowing wire side, these blade portion extension lines intersect, each tip side of the rotating blade blade portion and the fixed blade blade portion, through a gap such that the wire does not escape, polymerize. The wire cutting device is configured to be inclined at an angle such that the wire hanging substantially orthogonal to the fixed blade blade portion is cut in cooperation with the rotary blade and obliquely cut with respect to the axis of the wire, and the wire cutting device is It is a wire cutting device for an unmanned electric discharge machine, characterized by being covered with a box-shaped cover without a bottom that is detachably fixed to the rotating shaft side.

〔Example〕

The structure of the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a side view of a main portion, and FIG.
It is a B arrow line view of a figure.

In these figures, the wire cutting device of the present embodiment is installed at a terminal of a wire electrode electric discharge machine (not shown) for processing a plastic molding die, and a geared motor (90W, 200W) 1 With a rotary blade 2 made of ceramic that rotates with a rotary blade, and a fixed blade 3 made of ceramics, which is provided so as to face the rotary blade 2, at a speed of 80 to 250 mm / sec from the wire electrode electric discharge machine. Be paid out
A brass wire 4 having a diameter of 0.1 to 0.3 mmφ is cut into a chip-like length (6 cm) (180 to 190 pieces per minute) and accommodated in a wire receiving container (not shown).

Here, the rotary blade 2 is composed of a parallelepiped rectangular parallelepiped whose linear blade portion is provided on a ridgeline on one side of the upper surface, and is viewed from the wire side flowing down to the axis of the rotary shaft 5 (that is, Horizontal rotation axis 5 with an inclination of 5 ° (in plan view)
Mounted on

In addition, the wire 4 is fed downward from a nip roller (not shown) of the wire electrode electric discharge machine, and is cut between the rotary blade 2 and the fixed blade 3.

The fixed blade 3 has the same shape as the rotary blade 2,
A blade is provided on the ridgeline on one side of the lower surface, and is arranged inside the rotary blade 2. Therefore, the flowing wire 4 is arranged along the side surface of the fixed blade 3.
The blade portion of the fixed blade 3 is seen from the side orthogonal to the plane including the flowing wire 4 and the axis O of FIG.
It is attached to the fixed blade holder 56 at a depression angle of about 1 °.
Of course, the tips of the rotary blade 2 blade portion and the fixed blade 3 blade portion are overlapped with each other through a very small gap as shown in the figure, so that the wire 4 is prevented from escaping. Therefore, the extension lines of the blades intersect.

Therefore, the wire 4 hanging substantially perpendicular to the blade portion of the fixed blade 3 is sheared by the rotary blade 2 and is cut diagonally (α = 5 °) with respect to the axis of the wire 4. Has become. Examination of this cut surface confirmed that the cut surface of the wire rod was larger than that of a conventional cutter for cutting wire rods of this type, and thus the fracture surface was made smaller, and by extension, It can be cut well.

In addition, when cutting the wire, the cut surface refers to the case where the blade part itself shears, and the cut surface shows gloss, while the fracture surface is the cutting by the blade part. Instead, it refers to the case of cutting by a break, and the cut is gritty. Then, it was confirmed that the larger the cut surface area occupied by the cut surface, the better the cutting performance.

Next, the rotary blade 2 and the fixed blade 3 will be described in detail.

The rotary blade 2 is rotated by the geared motor 1 (about 180 to 1
90 rpm), a speed reducer shaft 7 is projected from the geared motor 1, and the rotary shaft 5 is externally fitted to the speed reducer shaft 7 and is keyed. The base of the rotary shaft 5 is supported by a ball bearing 8 to prevent center deviation. The ball bearing 8 is fitted into a bearing holder 9, and the bearing holder 9 is fixed to a flange 10 of the geared motor 1. On the other hand, a cutout surface 11 is formed at the tip of the rotary shaft 5, and an L-shaped rotary blade holder 12 is placed on the cutout surface 11 and fixed by bolts 13 and 13. The rotary blade 2 is brought into close contact with the rotary blade holder 12 via a spacer 14 and fixed by a bolt 15.

Next, the fixed blade 3 is attached as follows.
That is, the fixed blade mounting member 16 is fixed to the bolt 17 on the front surface of the flange 10, and the fixed blade holder 6 is fixed to the fixed blade mounting member 16 with the bolts 18 and 18. The fixed blade 3 is superposed on the tip surface of the fixed blade holder 6 through the spacer 19, the guide plate 20 and the block 21 with the guide groove are superposed, and the wire guide block 22 is superposed on the block 21 with the guide groove. Then, the bolts 23 are tightened and integrated. The block 21 with the guide groove is formed by penetrating a funnel-shaped guide groove 21a. The wire guide block 22 has an inverted L shape, a nozzle 24 is embedded in an upper piece of the wire guide block 22, and a guide tube 25 is erected on the nozzle 24.

In addition, the fixed blade holder 6 and the wire guide block 22
A feed roller 26 composed of a pair of rollers is arranged between the upper piece and the upper piece, and one of the feed rollers 26 is driven from the middle of the rotary shaft 5 via a rope 27. It has become. That is, the pulley 30 and the feed roller 26 are fitted to the feed roller shaft 29 rotatably supported by the bracket 28. The feed roller 26 is made of ceramics and is fixed to the feed roller shaft 29 by a tightening bolt 31.

The device described above has a box-shaped cover 32 without a bottom on the outside.
Covered with. The box-shaped cover 32 is attached to the flange 10. Further, the rotary blade 2 and the fixed blade 3
, And a rope cover 33 is attached between the rope 27 and the rope 27, and particularly protects the rope 27 from the chip-shaped wires that are cut and scattered.

This rope cover 33 has a rotating shaft 5 as shown in FIG.
The plate body 35 is provided with a center hole 34 that is loosely fitted in the plate body 35, and as shown in FIG. 4, a curved guide plate 36 is provided so as to stand upright on the rotational direction side of the rotary blade 2. Is fixed to the front surface of the bearing holder 9 with bolts 37.

Since the configuration of the present embodiment is as described above, its operation will be described. The wire 4 fed from the pinch roller of the wire electrode electric discharge machine is guided by the guide tube 25, is temporarily stored, and goes into the feed roller 26 via the nozzle 4. The wire 4 bite into the feed roller 26 is guided by the guide groove 21a and flows down along the side surface of the fixed blade 3. Then, the wire 4 flowing down is sandwiched between the rotary blade 2 and the fixed blade 3 and cut into chips. Chip-shaped wire 4 is box-shaped cover 3
2. Dropped into the wire receiving container while being regulated by being surrounded by the plate body 35 and the guide plate 36.

[Effects of the Invention] According to the present invention, the following various effects can be achieved.

With respect to the fixed blade part, the rotary blade part is tilted at a slight angle when viewed from the side of the flowing wire, and the rotary blade part is
Since the fixed blade blade portion is tilted at a slight depression angle when viewed from the side orthogonal to the surface including the flowing wire and the rotating shaft, the tips of both blade portions are polymerized through a minimal gap,
The cutting wire has a scissor cut when viewed from the wire side, and a presser cut when viewed from the side orthogonal to the surface including the flowing wire and the rotation axis core. The cutting surface can be made large (that is, the fracture surface is small) to improve the sharpness, and the cutting energy in both blade portions can be dispersed to extend the life of the blade portion.

Fixed blades and rotary blades are made of ceramic parallelepiped rectangular parallelepipeds and fixed with bolts, so general-purpose inexpensive blades with a simplified structure can be used, which is convenient for wire cutting devices that require frequent replacement. Moreover, the angle and depression angle can be easily formed and adjusted by an insert or the like.

In addition, since the feed roller is provided, even if the wire is cut unexpectedly during electric discharge machining, the operation can be continued by the automatic wire connection device, and the cut wire that flows down is sent to the wire cutting device by the feed roller. Since the chip is completely cut by the above, there is no hindrance to the progress of a new wire.

Even if the wire is cut by unmanned operation, the box-shaped bottomless cover is provided, so the chip-shaped wires do not scatter and the equipment around the wire cutting device is not damaged.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention, and FIG. 2 is A of FIG.
-A sectional view taken along arrow A, FIG. 3 is a side view of a main portion, and FIG. 4 is a view taken along arrow B of FIG. 2 ... rotary blade, 3 ... fixed blade, 4 ... wire, 5 ... rotary axis,
26 ... Feed roller, 32 ... Box cover, 35 ... Plate, 36 ...
Guide plate.

Claims (1)

(57) [Scope of utility model registration request] 1. A wire electrode electric discharge machine with an automatic wire connection device, and a wire cutting device comprising a rotary blade and a fixed blade for cutting the wire discharged from the wire electrode electric discharge machine into chips. In a wire cutting device in which a feed roller composed of a pair of rollers is interposed directly above the wire cutting device, a wire having a straight blade portion provided on one side below and flowing down through a funnel-shaped guide groove is provided. The fixed blade, which is arranged along the surface on which the part is located, is formed into a ceramic parallelepiped rectangular parallelepiped and fixed to a fixed blade holder with a bolt, and a linear blade part is provided on one side above and the blade part is formed. Is fixed to the cutout surface of the rotary shaft having a horizontal shaft core by a bolt, and the rotary blade is made to rotate in close proximity to the fixed blade part, and is fixed to the cutout surface of the rotary shaft by a bolt. On the other hand, the fixed blade blade portion is viewed from a side orthogonal to the surface including the flowing wire and the horizontal axis of the rotating shaft, and these blade portion extension lines intersect, and each of the rotating blade blade portion and the fixed blade blade portion. The tip side cooperates with the rotary blade to clip the wire that overlaps and hangs down substantially orthogonal to the fixed blade part through a gap that does not allow the wire to escape and cut diagonally to the axis of the wire. Inclining at a depression angle with a different angle, the rotary blade edge with respect to the fixed blade edge, as seen from the flowing wire side, these blade extension lines intersect, and the rotary blade edge and the fixed blade edge Each tip side,
At an angle such that the wire that overlaps through the gap that the wire does not escape and that hangs substantially orthogonal to the fixed blade part cuts in cooperation with the rotary blade and obliquely cuts with respect to the axis of the wire. A wire cutting device for an unmanned electric discharge machine, wherein the wire cutting device is tilted and is covered with a bottomless box-shaped cover that is detachably fixed to the rotating shaft side.