JPH03190624A - Precisely finishing device for minute hole - Google Patents

Abstract

PURPOSE:To improve operation efficiency and machining accuracy for boring by providing a guide mechanism which seizes a minute wire electrode cut between a cutting mechanism and the arm of the minute wire electrode supply side of a supporting frame to guide the cut end of the minute wire electrode to the prepared hole of a bored material. CONSTITUTION:A work mechanism 2 is operated to locate the next prepared hole of a bored material P right under a minute wire electrode T, and a guide mechanism 8 is operated to lower the cutting end of the minute wire electrode T. The minute wire electrode T is inserted into the prepared hole of the bored material P and the insulator of the arm 32 of the supporting frame 3 to be connected to the fluid cyclone 91 and the bringing roller 92 of a recovery mechanism 9. Under this condition, after the guide mechanism 8 is moved upward for standby high voltage is applied to the minute wire electrode T from an electric source supply mechanism 5 so that the minute bore-finishing of the prepared hole of the bored material P may be carried out by discharging machining using high voltage energy.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a precision finishing device for fine holes.

More specifically, the present invention relates to an apparatus suitable for continuously and accurately drilling and finishing fine holes having an extremely small diameter and a relatively large depth relative to the diameter.

[Conventional technology]

Examples of the fine holes include die holes of a mold die used for simultaneously perforating a ceramic green sheet in one process, one gigantic at a time.

In forming this die hole, 1. Thickness at intervals of about Qmm 1.0 to 2.
A hole with a hole diameter of 0.1 mm is made with respect to 0.0 mm.

Conventionally, such microhole drilling means include, for example,
Generally, it is known to use a CNC electric discharge machine. In addition to this, electron beam processing, laser processing, etc. are also used.

In addition, drilling by boat is also used.

C. Problems to be Solved by the Invention The above-described conventional microhole drilling means has a problem in that the device is expensive due to the complexity of the device structure.

Furthermore, there is a problem in that the efficiency of drilling is low when continuously drilling a large number of fine holes.

Further, there is a problem that the drilling accuracy is low, such as the wall surface of the drilled microhole being tapered and the hole diameter not being uniform.

Furthermore, in the above-mentioned drilling method, it is difficult to avoid misalignment from a predetermined position even when using a three-blade drill, and it is also difficult to obtain the desired finished surface on the wall surface. Ta.

The present invention has been made in consideration of these problems, and an object of the present invention is to provide a precision finishing device for fine holes that has good drilling efficiency and machining accuracy and is inexpensive.

[Means to solve the problem]

In order to achieve the above-mentioned object, the microhole precision finishing device according to the present invention includes a work mechanism that moves the perforated material that has undergone preliminary hole processing, and a work mechanism that moves the perforated material that has been moved to the perforated position in a fixed manner relative to each other. a support frame having an arm disposed;
An ultra-fine wire electrode supported by both arms of a support frame and inserted into a pilot hole of a perforated material, and an ultra-fine wire electrode supply mechanism provided on the outside of one arm of the support frame to supply the ultra-fine wire electrode intermittently and continuously. , a power supply mechanism that applies high voltage to the ultra-fine wire electrode inserted into the pilot hole of the perforated material, and a cooling system that cools the area around the ultra-fine wire electrode that is inserted through the pilot hole of the perforated material and is applied with high voltage by the power supply mechanism. a cutting mechanism for cutting the ultra-fine wire electrode between the perforation material and the arm on the ultra-fine wire electrode supply side of the support frame; A means comprising a guide mechanism that grips the ultra-fine wire electrode and guides the cut end of the ultra-fine wire electrode to the pilot hole of the drilling material is adopted.

[Effect]

According to the above-mentioned method, the hole in the material to be drilled can be rough-drilled using general drilling, etc., and the rough-drilled hole is precisely made into a uniform hole diameter by electrical discharge machining using an ultra-fine wire electrode inserted into the hole. After finishing the drilling of one pilot hole, the ultra-fine wire electrode is cut and inserted into the next pilot hole, so that the drilling operation can be carried out efficiently.

Furthermore, since the structure around the ultra-fine wire electrode utilizes a conventional general wire cutting structure, the structure is simple and the unit cost of the constituent parts is low, making it possible to manufacture the entire device at low cost.

Therefore, the problem of providing a precision finishing device for fine holes that has good drilling efficiency and machining accuracy and is inexpensive is solved.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the precision finishing apparatus for fine holes according to the present invention will be described below with reference to the drawings.

In this embodiment, a structure is shown in which an ultra-fine wire electrode T is supplied in a perpendicular direction to a perforated material (work) P that moves on the horizontal plane of a horizontally installed base 1. ing.

A work mechanism 2 is installed on the base 1.

This work mechanism 2 includes an X-axis moving section 21. A work table 23 is provided with a Y-axis column moving part 22 and is movable in vertical and horizontal directions (X-axis, Y-axis directions) on the plane of the base 1, and a box-shaped work holder is attached to the tip of the work table 23. Perforated material P in 24
can now be set. As shown in detail in FIG. 3, the work holder 24 is box-shaped with an open top, a drain hole 24a in the bottom, and an overflow hole 24b in the side. The perforated material P is inserted and set into the positioning pin 24c.

This work mechanism 2 is driven and controlled by a controller (not shown).

Note that the perforated material P set in the work holder 24 is
A pilot hole P° is roughly drilled in advance by drilling or the like.

A support frame 3 is installed on the base 1 at a position slightly in front of the work mechanism 2.

This support frame 3 has vertically opposing arms 31, 3.
2 and is formed in a U-shape, and is fixed to the base 1 so that the opening of the U-shape is the perforation position of the perforation material P. Each arm 31, 32 has two sets of insulating idlers 31a, 31a and two rollers 31b, 3 as shown in FIGS. 2(A) and 2(B), respectively.
A positioning mechanism 30 consisting of 1b is provided, and the perforated material P
The ultrafine wire electrode T inserted through the pilot hole P1 can be insulated and supported on both the upper and lower sides of the perforated material P.

The ultra-fine wire electrode T supported via the positioning mechanism 30 is made of brass or tungsten and has a diameter of 0. It is formed to have a thickness of 10 to 0.05 mm. Incidentally, the wire used in wire cutters for boat fishing is made of brass and has a diameter of 0.30 to 0.20 mm.

An ultrafine wire electrode supply mechanism 4 is installed on the upper side of the arm 31 on the upper side of the support frame 3 .

This ultra-fine wire electrode supply mechanism 4 includes a storage bobbin 41 in which an ultra-fine wire electrode T is wound into a long length, and a storage bobbin 41 that is rotatably driven to intermittently feed the ultra-fine wire electrode T to the support frame 3 in a fixed length or continuously. A feeding roller 42 and a storage bobbin 41. Idler 43 provided between feeding rollers 42
It consists of Note that this feeding roller 42 is arranged directly above the positioning mechanism 30 of the arm 31 of the support frame 3, and this roller 42 may also serve as the idler 31a of the positioning mechanism 30.

This ultra-fine wire electrode supply mechanism 4 (feeding roller 42) is driven and controlled by a controller (not shown).

A power supply mechanism 5 is connected to the ultrafine wire electrode T fed out from the ultrafine wire electrode supply mechanism 4 .

This power supply mechanism 5 includes a power supply main body 51 that applies a high voltage to an ultra-fine wire electrode T inserted through a pilot hole P'' of a perforated material P, supplies high voltage energy, and causes discharge to occur in the pilot hole P''; A feeder wire 52 connects the electrode of the power source main body 51 and the feeding roller 42 of the ultra-fine wire electrode supply mechanism 4, and one pole of the power source main body 51 and the perforated material P set in the work holder 24 of the work mechanism 2 are connected. It consists of a feeder line 53.

This power supply mechanism 5 is controlled by a controller (not shown).

A cooling mechanism 6 is provided for the ultrafine wire electrode T that generates heat by discharging.

This cooling mechanism consists of a nozzle that is connected to a water pump (not shown) and is directed toward an ultra-fine wire electrode T that is inserted into a lower hole P° of a perforated material P, and cools the ultra-fine wire electrode T that generates heat by injecting cooling water. It is supposed to be done. Note that this cooling water is injected into the box-shaped work holder 24 of the work mechanism 2 and is prevented from scattering to the outside, and if it is discharged from the drain hole 24g of the work holder 24 or excessively stagnates, it will be discharged from the overflow hole 24b. It is starting to overflow from

A cutting mechanism 7 is installed between the upper arm 31 of the support frame 3, which is the supply side of the ultrafine wire electrode T, and the perforated material P located below the upper arm 31.

This cutting mechanism 7 includes a cutter 71 that cuts the ultra-fine wire electrode T that has been inserted into a prepared hole P' of the drilling material P and has undergone electrical discharge machining in order to be inserted into another prepared hole P', and a cylinder that operates the cutter 71. It consists of 72. In addition, these cutters 71
．． It also has a cylinder (not shown) that moves the cylinder 72 close to and away from the ultra-fine wire electrode T, and is placed on standby at a position separated from the ultra-fine wire electrode T except when cutting.

The cutting mechanism 7 is driven and controlled by a controller (not shown).

A guide mechanism 8 is provided between the cutting mechanism 7 and the upper arm 31 of the support frame 3.

This guide mechanism 8 includes a hand 8 that grips the ultra-fine wire electrode T.
1 and an arm 82 that moves a hand 81 up and down by an actuator (not shown), which grasps the ultra-fine wire electrode T cut by the cutting mechanism 7 and moves it down, so that the cut end is cut into the perforated material P.
It is inserted into the new pilot hole P'. In addition, after the ultra-fine wire electrode T is inserted into the prepared hole P' of the perforated material P, the ultra-fine wire electrode T is released and placed on standby on the arm 31 side above the support frame 3.

This guide mechanism 8 is driven and controlled by a controller (not shown).

A recovery mechanism 9 is installed on the lower side of the arm 32 on the lower side of the support frame 3.

This recovery mechanism 9 is arranged directly below the insulators 32a and 32b of the arm 32 of the support frame 3, and is equipped with ultra-fine wire electrodes T.
between a funnel-shaped fluid cyclone 91 that guides the cut end vertically downward by a water stream or the like, and a feeding roller 43 of the extremely fine wire electrode supply mechanism 4 that is provided below the fluid cyclone 91 and bites the fine wire electrode T. a pull-in roller 92 that applies tension to the ultra-fine wire electrode T while intermittently pulling it down by a constant length; a scrap cutter 93 that is provided below the pull-in roller 92 and cuts the ultra-fine wire electrode T into pieces as it cuts and descends; It consists of a collection box 94 which is provided below the cutter 93 and stores the chopped ultra-fine wire electrode pieces T'.

This collection mechanism 9 (drawing roller 92) is driven and controlled by a controller (not shown).

In such an embodiment, since the structure is equipped with an electric discharge machining structure using a conventional general wire cutter structure, there is no need for special components or a complicated structure. , and can be manufactured at low cost.

Further, according to such an embodiment, the operating modes shown in FIGS. 4 to 9 are adopted.

That is, FIG. 4 shows the state immediately after the ultrafine wire electrode T is cut by the cutting mechanism 7, or in other words, it shows the state immediately after finishing the drilling of one pilot hole P' in the drilling material P. be. As shown in FIGS. 4 to 7, the ultra-fine wire electrode T cut in this way is guided by the hydrocyclone 91 of the recovery mechanism 9, pulled down by the pull-in roller 92, and further shredded by a scrap cutter 93. The ultra-fine wire electrode pieces T'' are collected and stored in the collection box 94. Therefore, the used ultra-fine wire electrode T can be easily disposed of. , the hand 81 of the guide mechanism 8 has already grasped the ultra-fine wire electrode T.

After cutting the ultra-fine wire electrode T shown in FIG. 4, the cutting mechanism 7 moves to a standby position separated from the ultra-fine wire electrode T as shown in FIG. 5, so that it does not interfere with the operation described later.

After waiting for movement of the cutting mechanism 7 shown in FIG. 5, as shown in FIG. 6, the work mechanism 2 is operated to
The next pilot hole P' in the perforated material P is positioned directly below the hole P', and the guide mechanism 8 is operated to lower the cut end of the ultra-fine wire electrode T. Note that when the cut end of the ultra-fine wire electrode T is lowered, the feeding roller 42 of the ultra-fine wire electrode supply mechanism 4 is also driven. Further, the amount and direction of movement of the work mechanism 2 can be reliably controlled by a controller (not shown) using an image processing method or the like.

The descent of the cut end of the ultra-fine wire electrode T shown in FIG.
As shown in FIG.
The involvement of the guide mechanism 8 ends when it is inserted into the body, and thereafter the hydrocyclone 91 and the retraction roller 92 of the recovery mechanism 9 become involved.

As shown in FIG. 8, the ultra-fine wire electrode T is connected to the lower hole P° of the perforated material P, the insulator 32a of the arm 32 of the support frame 3,
32b of the recovery mechanism 9.
After moving the guide mechanism 8 upward in a state linked to the retracting roller 92 and standing by as shown in FIG. The pilot hole P' of the drilling material P is finished with precision. In this drilling finishing by electric discharge machining, the cooling mechanism 6 avoids problems caused by heat generation, and the cooling water of the cooling mechanism 6 removes machining debris, resulting in a more precise finish.

After this, the cutting of the ultra-fine wire electrode T shown in FIG. 4 is repeated, and a predetermined number of small holes P° in the perforated material P are continuously and efficiently completed.

Note that such drilling finishing is of course effective for simple drill holes other than fine deep holes.

In addition to the embodiments shown above, embodiments in which the direction of supply of the ultrafine wire electrode T and the direction of movement of the perforated material P are directions other than the vertical and horizontal directions are also possible.

Furthermore, the recovery mechanism 9 may be configured to simply drop the cut ultra-fine wire electrode T downward.

In addition, +00 shown in FIG. 1 is a constant temperature box that covers the device part on the base 1, which ensures the processing accuracy of the device and eliminates the need to keep the entire factory at a constant temperature. or,
1G2 shown in FIG. 6 is a COD camera that controls the robot hand by image processing during wire threading.

〔Effect of the invention〕

As described above, the microhole precision finishing device according to the present invention has the following features:
A pilot hole roughly drilled by drilling etc. is precisely finished to a uniform hole diameter by electrical discharge machining using an ultra-fine wire electrode inserted into the hole, and after completing the drilling of one pilot hole, the ultra-fine wire electrode is cut. Since the hole can be inserted into the next pilot hole and drilled continuously and efficiently, it has the effect of improving the efficiency and accuracy of drilling. Moreover, this effect produces an effect of reducing the drilling cost.

Furthermore, since the structure uses a conventional wire cutter structure, and the electrode support is an integral structure, the structure is simple and less susceptible to thermal expansion, etc., and the unit cost of component parts is low, and the overall accuracy of the device can be improved. It has the advantage of being able to be manufactured easily and at low cost.

[Brief explanation of drawings]

Fig. 1 is a front cross-sectional view showing an embodiment of the microhole precision finishing device according to the present invention, Fig. 2 (A) is a front view of the positioning mechanism, Fig. 2 (B) is its side view, and Fig. 3 1 is an enlarged perspective view of the main part of FIG. 1, and FIGS. 4 to 9 are views sequentially showing the operation of FIG. 1. 2: Work mechanism 3: Support frame 4, ultra-fine wire electrode supply mechanism 5: Power supply mechanism 6: Cooling mechanism 7: Cutting mechanism 8 Guide mechanisms 31, 32 Arm P゛: Prepared hole T: Ultra-fine wire electrode P: Perforated material No. Figure 1

Claims (1)

[Claims] a work mechanism for moving the perforated material that has been prepared with a prepared hole; a support frame having arms that are fixedly arranged relative to each other through the perforated material that has been moved to the perforated position; and a perforated material that is supported by both arms of the support frame. An ultra-fine wire electrode is inserted into the pilot hole of the drilling material, an ultra-fine wire electrode supply mechanism is installed on the outside of one arm of the support frame and supplies the ultra-fine wire electrode intermittently and continuously, and the micro-wire electrode is inserted into the pilot hole of the drilling material. A power supply mechanism that applies high voltage to the ultra-fine wire electrode, a cooling mechanism that cools the area around the ultra-fine wire electrode that is inserted into the lower hole of the perforated material and is applied with high voltage by the power supply mechanism, and A cutting mechanism that cuts the ultra-fine wire electrode between the arm on the wire electrode supply side, and a cutting mechanism that cuts the ultra-fine wire electrode between the cutting mechanism and the arm on the ultra-fine wire electrode supply side of the support frame. A precision finishing device for fine holes, comprising a guide mechanism that guides the cut end to the pilot hole of the drilling material.