JPH04115829A - Electrolytic deburring device, electrolytic deburring method and electrode - Google Patents

Abstract

PURPOSE:To uniformly and speedily carry out removal of burr grown at an intersection part of a plural number of holes by improving an electrolytic machining precision and a electrolytic machining speed by means of relatively oscillating a machined article in the shaft direction of an electrode. CONSTITUTION:At the time of removing burr grown at an intersection part of a plural number of holes provided on an machined article, a bar type electrode 2 is inserted in one of the holes selected from a plural number of holes holding the machined article 4. Additionally, voltage is applied so that this electrode 2 comes to be a negative electrode and the machined article 4 comes to be a positive electrode respectively. Electrolytic deburring is carried out by way of adding mechanical oscillation to the electrode 2 inserted into the hole of this machined article 4 into which this electrode 2 is inserted in the shaft direction of the electrode 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an electrolytic deburring device, an electrolytic deburring method, and an electrode for removing burrs generated in intersecting holes.

(Prior Art) In general, small diameter holes (^), (B) having an inner diameter of 2++n+ or less, which are orthogonal to each other as shown in FIG. 10, are usually formed by cutting with a drill. Burrs (D) are almost always generated at the intersections (Cl) of these holes (^) and (B). Therefore, conventionally, the generated burrs (D) are removed by thermal deburring (
The "mal Debu" ring (thermal shock) hollowing out) Extrude Horn method (Exl+ude Hor
n Process). Thermal deburring described above involves placing the workpiece in a sealed container, mixing hydrogen and oxygen appropriately, and igniting it, which causes an explosion.The burr area in particular becomes hot and oxidizes, melts, or evaporates, and at the same time This method uses 8 shock waves to blow them away. On the other hand, the extruded horn method uses a semi-solid viscoelastic material called media mixed with abrasive grains, and the aforementioned media is applied to the workpiece held in a jig. By press-fitting, deburring is performed.

However, in deburring by thermal deburring, although the tip of the burr (D) generated at the intersection point (C) can be removed, it is difficult to remove the root of the burr (D), and it is difficult to completely remove the burr. It has a problem that it does not work. If you try to remove the burr (Dl) to the root, the deburring process is the final step of the processing process, and there is a risk of damaging other parts. Although it is possible to completely remove (D), the holes (A) and (B) themselves will expand by about 0.5 mm, and the roundness of the hole (AL (B)) will be impaired, so the processing Since the accuracy is significantly reduced, it cannot be practically used for manufacturing precision mechanical parts.

(Problems to be Solved by the Invention) As described above, thermal deburring is conventionally used to remove burrs (D) generated at the intersection (C) of small diameter holes (A) and (B) that intersect with each other. Each of the extrude horn methods has problems in terms of deburring ability and processing accuracy, and is not a practically effective deburring method.

The present invention has been made in consideration of the above circumstances, and includes an electrolytic deburring device, an electrolytic deburring method, and an electrode that can completely and highly accurately remove burrs generated at the intersection of small diameter holes that intersect with each other. The purpose is to provide

[Configuration of the Invention (Means and Effects for Solving the Problems) The electrolytic deburring device of the present invention includes a vibrating section,
The workpiece can be vibrated relative to the axial direction of the electrode, improving electrolytic machining accuracy and electrolytic machining speed. As a result, burrs generated at intersections of multiple holes can be removed uniformly and quickly. be able to. In addition, since it is equipped with an electrode rotating section, electrolytic deburring can be performed while rotating the electrode, and together with the provision of the above-mentioned vibrating section, deburring accuracy and deburring efficiency are significantly improved. This can contribute to improving product quality and productivity.

In addition, the electrolytic deburring method of the present invention vibrates the workpiece relatively in the axial direction of the electrode, and as a result, the electrolytic machining accuracy and electrolytic machining speed are improved. The generated burrs can be removed uniformly and quickly.

Furthermore, since electrolytic deburring is performed while rotating the electrode, the workpiece is vibrated in the axial direction of the electrode, which significantly improves deburring accuracy and deburring efficiency. can contribute to improving quality and productivity.

Furthermore, since the electrode of the present invention has a tapered portion at its tip and a parallel portion adjacent to the tapered portion, the tip of the burr that is generated at the intersection of a plurality of holes can be removed. After the portion is removed by the taper portion, the root portion of the burr can be completely removed. Further, since the insulating portion is attached to the portion other than the tapered portion of the electrode and the parallel hole, the diameter of the inner wall surface of the hole is not expanded by electrolytic machining.

Furthermore, since the electrode of this example is provided with a through hole, the electrolyte is smoothly discharged through the through hole, and the electrolyte that has entered the clearance between the electrode and the inner wall of the hole is Boiling does not interfere with electrolytic processing.

(Example) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

Figures 1 and 2 show the electrolytic deburring device (
1) is shown. This electrolytic deburring device (1) consists of an electrode holding part (3) that holds an electrode (2) that is rod-shaped and has a through hole (2a) along its axis (see Figure 6); 2), a workpiece holding part (5) that holds the workpiece (4) to be deburred by the workpiece holding part (5);
5) The workpiece (4) held at 5) has a frequency of 408! an excitation part (6) that applies vibration with an amplitude of 1.5 mm, an electrode (2) held in an electrode holding part (3), and a workpiece (4) held in a workpiece holding part (5). ), and an electrolyte supply unit (Ra) that supplies electrolyte (Ra) to the machining area of the workpiece (4) held in the workpiece holding unit (5). 8) It consists of. Thus, the electrode holding part (3) includes an electrode rotating part (9) that holds the electrode (2) and rotates it around its axis, and an electrode rotating part (9) that holds the electrode (2) and rotates it around its axis.
9) and an electrode guide part (10) on which the electrode guide part (10) is placed and guided so as to move forward and backward in the directions of arrows (II) and (I2). Here, as shown in FIGS. 3 and 4, the workpiece (4) has a cylindrical shape with an outer diameter of, for example, 5 mm, and a blind hole with an inner diameter of, for example, 2.5 mm in the axial direction. (4a) is bored, and a through hole (4b) perpendicular to this blind hole (4a).
) are drilled. A burr (4c) as shown in FIG. 5 is generated at the intersection of the blind hole (4a) and the through hole (4b). Thus, the electrode rotating section (9) includes a chuck body (lOa) that has conductivity and horizontally holds the electrode (2) in a removable manner, and a pair of chuck bodies (lOa) that pivotally support both ends of this chuck body (lea). Bearings (Ill,
(121, a pair of bearings (II), (+21 is fixed to one side of the plate (+3), and this plate (+3)
A motor (14) fixedly installed on the other side of the chuck body (Ih) and a first pulley (, +5) externally fitted in the middle of the chuck body (Ih)
and the main shaft of the motor (14) (the second
pulley (+7), and a belt (18) wound between the first pulley (15) and the second pulley (17). The main shaft (+6) and the electrode (2) held by the chuck body (10s) are provided horizontally and in parallel.

In addition, the bearings (11), (121) and the motor (I4) are
(played through an insulator not shown) (ill installed).

Further, the electrode guide section (10) is arranged on a table (1) that guides the plate (+3) in the directions of arrows (XI) and (I2).
9) and the plate (1g) engaged with this table (1g).
3), a feed screw (20) screwed into the lower part of the feed screw (20), and a motor (2I) connected to one end of the feed screw (20), which drives the table (19) forward and backward by rotating the feed screw (20). It consists of On the other hand, the workpiece holding section (5) has a table (22) provided opposite to the table (19), and an arrow (XI) on this table (22).
), a plate (
23) and an electrode (2) provided on this plate (23) and holding the workpiece (4) on the chuck body (103).
A fixture (25) that is removably fastened coaxially with the insulating plate (24) interposed between the plate (23) and the workpiece (4), and an electrode guide part (22) of the table (22). 10) and a guide body (I6) made of an insulating material that slidably supports the electrode (2) attached to the end of the side and held in a cantilever shape by the chuck body (101) in the axial direction. There is. Furthermore, the vibrating part (5) is connected to a support joint (27) provided spaced apart on the opposite side of the electrode guide part (lO), sandwiching the table (22) of the workpiece holding part (5); Support stand (27)
A vibrating body (2) forming a cylindrical superfinishing head supported by
8) and an air hose (
29) and the vibrating body (29) via this air hose (29).
8) an air source (30) that supplies compressed air to generate mechanical vibrations with a frequency of about 40 kHz and an amplitude of 1.5 m;
One end is connected to the vibrating body (28), and the other end is connected to the table (22) of the workpiece holding section (5).
) and a connecting rod (31) that transmits the mechanical vibrations generated at the table (22) to the workpiece (4) held on the table (22). On the other hand, the power feeding unit (7) connects a first electric wire (32) electrically connected to the workpiece (4) and a chuck body (
10 current collectors (33) connected in series, and this current collector (3
3) and supplies power to the electrode (2) held on the chuck body (il+) via the current collector (33).
electric wire (34), first electric wire (32) and second electric wire (
34) is connected to a power source (35). Here, the first electric wire (32) side is set to be a positive electrode, and the second electric wire (34) side is set to be a negative electrode. Also,
The electrolyte supply section (8) is connected to the through hole (4b) of the workpiece (4).
) and supplies the electrolytic solution (8a) to the blind hole (4a) through the through hole (4b), and A gutter (37) is attached to the end and is connected to the back of the chuck body (10g) for collecting the electrolyte (8a) supplied from the first hose (36) and spouted from the opening of the blind hole (4a). A second hose (38) that collects the electrolytic solution (8a) that has flowed into the through hole (2a) of the electrode (2) from the blind hole (4a) side, and a second hose (38) that stores the electrolytic solution (82) and a first hose (36),
It consists of a tank (39) to which a second hose (38) and a gutter (37) are connected and in which electrolyte (8) is refluxed.

Next, FIG. 6 shows the electrode (2) of this embodiment. This electrode (2) is made of a conductive material such as copper (Cu), and includes a circular tube section (40) having a through hole (21), and one end side of the outer peripheral surface of this circular tube section (40). It consists of an insulating part (41) made of a deposited ceramic film such as alumina and having a thickness of about O, Iwm+, for example. The outer diameter of the electrode (2) in the insulating part (41) is 0.000000000000 than the inner diameter of the blind hole (4a) of the workpiece (4).
．． The distance is approximately 0.02 m to 0.8 m. Further, the outer circumferential portion of the circular tube portion (40) where the insulating portion (41) is not attached is a tapered portion (42) formed at the most distal end portion.
) and a parallel portion (43) adjacent to this tapered portion (42).
It consists of This parallel part (43) is a circular pipe part (4
The insulating part (41) is not attached to the insulating part (41), but the outer diameter is the same as that of the circular tube part (4G) covered by the insulating part (41). The outer diameter D1 of the tip of the tapered portion (42) is set such that an optimum clearance can be obtained for electrolytically processing the tip of the largest burr (4C). Further, the outer diameter D2 of the parallel portion (43) is
It is provided so that the optimum clearance can be obtained for electrolytic processing of the root part of J (4C).

Next, the electrolytic deburring device (1) having the above configuration and the electrode (
2), the electrolytic deburring method of this example will be described.

First, the electrode (2) is held on the chuck body (IO) so that the tapered part (42) faces the workpiece holding part (5), and then the motor (14) is started and the first The electrode (2) is rotated in the direction of the arrow (θ) through the second pulley (15), the second pulley (17) and the belt (18).Meanwhile, the workpiece (4) is placed on the plate (231). ,Fixture(
25) so as to be coaxial with the electrode (2). Then, compressed air is supplied from the air source (30) to the vibrating body (28) via the air hose (29), and the connecting rod (3
I) the workpiece (4) on the plate (23) through the
Vibrate in the directions of arrows (XI) and (X2) at a frequency of approximately 40kHz and an amplitude of approximately 1.5cm. Then, the tank (3
9), the electrolytic solution (81) is injected into the through hole (4b) of the workpiece (4) via the first hose (36).

Further, the motor (21) is started to rotate the feed screw (20), and the electrode (2) mounted on the play plate (13) is sent in the direction of the arrow (XI). At the same time, the power source (35) connects the first electric wire (32) and the fixture (25).
), a voltage is applied so that the workpiece (4) becomes the positive electrode, and the electrode (2) becomes the negative electrode via the second electric wire (34) and the current collector (33). Now, the motor (21)
When the electrode (2) is sent in the direction of the arrow (xl), as shown in FIG. 6, it will eventually be loosely inserted into the blind hole (4a) of the workpiece (4) (see FIG. 7). Finally, the taper part (42) of the workpiece (4) is connected to the blind hole (4a) and the through hole (4).
Reach the intersection with h). A burr (4C) is generated at this intersection. Immediately before reaching this intersection, the speed at which the electrode (2) is fed by the motor (21) is decelerated.

At this time, the electrolytic solution (82
) flows out to the outside via the blind hole (4a). The electrolyte solution (8a) that has flowed out is collected into the tank (39) by the gutter (37). In addition, the through hole of the electrode (2) (
The electrolytic solution (8a) that has flowed into the tank 2a) is collected into the tank (39) via the second hose (38). Therefore, the workpiece (4) is connected to the positive electrode by the power feeding section (7).
In addition, since a voltage is applied to the electrode (2) so that it becomes a negative electrode, the tip (4 cm 1) of the burr (4C) first becomes the tapered part of the electrode (2) that is being rotated by the motor (14). (42) is removed by electrolytic processing (see Figure 5). Then, as the electrode (2) gradually moves forward in the direction of the arrow (xl), as shown in FIG.
2) is removed by electrolytic processing using the parallel portion (43) (see imaginary line in Figure 7). At this time, most of the electrode (2) faces the inner wall surface of the blind hole (4a), but since the insulating part (41) is attached to this part, the electrode (2) faces the inner wall surface of the blind hole (4a).
The inner wall surface will not be expanded in diameter by electrolytic machining.

Further, in this case, the electrode (2) is rotating in the direction of the arrow (θ), and the workpiece (4) is rotating in the direction of the arrow (Xl).
In the (X2) direction, the frequency is 4flkHr and the amplitude is 15
(2) Since it vibrates, the electrolytic machining accuracy and electrolytic machining speed are improved. In addition, since the clearance between the electrode (2) and the inner wall surface of the blind hole (4a) is extremely small, for example, 0.04 m, the flow of the electrolytic solution (8a) is impeded and a boiling state occurs. Since the through hole (21) is provided, the electrolyte (8) flows smoothly toward the second hose (38) via the through hole (21), and the electrolyte (8) is boiling. Thus, when the removal of the root portion of the burr (4c) is completed, the motor (21) is reversed and the electrode (2) is retreated in the direction of the arrow (xl).

As described above, the electrolytic deburring device 1 (1
) is equipped with a vibrator (6), so the workpiece (4)
can be vibrated in the axial direction of the electrode (2), and as a result, the electrolytic machining accuracy and electrolytic machining speed are improved, and as a result, deburring can be performed uniformly and quickly.

In addition, since the electrode rotating part (9) is provided, the electrode (2)
Electrolytic deburring can be performed while rotating the machine, and together with the provision of the vibrating section (6), deburring accuracy and deburring efficiency are significantly improved.

In addition, in the electrolytic deburring device (1) of the above embodiment,
The electrode rotating part (9) may be omitted and electrolytic deburring may be performed without rotating the electrode (2). Furthermore, the vibrating section (6) may be connected to the electrode holding section (3) to vibrate the electrode (2) in its axial direction.

Further, the electrolytic deburring method of this embodiment is applied to the workpiece (4
) is vibrated in the axial direction of the electrode (2), the electrolytic machining accuracy and electrolytic machining speed are improved, and as a result, deburring can be performed uniformly and quickly. Furthermore, since electrolytic deburring is performed while rotating the electrode (2), the workpiece (4) is vibrated in the axial direction of the electrode (2), which improves deburring accuracy and deburring. The removal efficiency is significantly improved.

In addition, in the electrolytic deburring method of the above embodiment, the electrode (2) instead of the workpiece (4) may be vibrated in its axial direction. Alternatively, electrolytic deburring may be performed without rotating the electrode (2).

Furthermore, the electrode (2) of this embodiment has a tapered part (42) at the tip and a parallel part (43) adjacent to this tapered part (42), so the blind hole (
After the tip of the burr (4c) generated at the intersection between 4a) and the through hole (4b) is removed by the taper part (42), the root of the burr (4c) can be completely removed. . In addition, the tapered part (42) and the parallel part (
Since the insulating portion (41) is attached to the portion other than 43), the diameter of the inner wall surface of the blind hole (41) will not be expanded by electrolytic machining. Furthermore, since the electrode (2) of this example is provided with the through hole (2a), the electrolytic solution (8
1) is smoothly discharged via the through hole (21), and the electrolytic solution that has entered the clearance between the electrode (2) and the inner wall surface of the blind hole (41) (8) is impeded by boiling. Never.

Note that the electrode used for electrolytic deburring is not limited to the above embodiments, and as shown in FIG.
Ceramic insulating ring body (51) at the tip of 42)
It may also be an electrode (2-1) that is crowned with a. This insulating ring body (51) is attached by adhesion or vapor deposition. By doing so, wear and tear of the electrode (2-1) due to electrolytic processing can be prevented, the life of the electrode can be significantly extended, and the electrode cost can be significantly reduced, which is a special effect.

Furthermore, as an electrode (2-2) of another embodiment, as shown in FIG.
) may be enclosed in a ring. This stopper (52)
The installation position is such that this stopper (52) is located at the workpiece (4).
), the parallel part (4
3) is set so that it is positioned at the location where the burr (4c) occurs. As a result, the stopper (52) causes the electrode (
2-2), and an accident caused by the electrode (22) coming into contact with the bottom of the blind hole (4a) can be prevented.

[Effects of the Invention] Since the electrolytic deburring device of the present invention includes the vibrating section, it is possible to vibrate the workpiece relatively in the axial direction of the electrode, improving electrolytic machining accuracy and electrolytic machining speed. As a result,
Burrs generated at intersections of a plurality of holes can be uniformly and quickly removed. In addition, since it is equipped with an electrode rotating section, electrolytic deburring can be performed while rotating the electrode, and together with the provision of the above-mentioned vibrating section, deburring accuracy and deburring efficiency are significantly improved. This can contribute to improving product quality and productivity.

Furthermore, since the electrolytic deburring method of the present invention vibrates the workpiece relatively in the axial direction of the electrode, the electrolytic machining accuracy and electrolytic machining speed are improved. The generated burrs can be removed uniformly and quickly.

Furthermore, since electrolytic deburring is performed while rotating the electrode, the workpiece is vibrated in the axial direction of the electrode, which significantly improves deburring accuracy and deburring efficiency. can contribute to improving quality and productivity.

Furthermore, the electrode of the present invention has a tapered portion at its tip, and the tapered portion 1. :191 Since the parallel parts are provided in contact with each other, the tip part of the burr generated at the intersection of the plurality of holes is removed by the tapered part, and then the root part of the burr can be completely removed. Further, since the insulating portion is attached to the portions of the electrode other than the tapered portion and the parallel portion, the diameter of the inner wall surface of the hole is not expanded by electrolytic machining.

Furthermore, since the electrode of this example is provided with a through hole, the electrolyte is smoothly discharged through the through hole, and the electrolyte that has entered the clearance between the electrode and the inner wall of the hole is Boiling does not interfere with electrolytic processing.

[Brief explanation of drawings]

Fig. 1 is a plan view of an electrolytic deburring device according to an embodiment of the present invention, Fig. 2 is a front view thereof, and Fig. 3 is a sectional view of a workpiece.
Figure 4 is a sectional view taken along the line IV-IV in Figure 3, and
The figure is an enlarged view of burrs, Figure 6 is a configuration diagram of an electrode according to an embodiment of the present invention, Figure 7 is an explanatory diagram of an electrolytic deburring method according to an embodiment of the present invention, and Figures 8 and 9 are FIG. 10, which is a configuration diagram of an electrode according to another embodiment of the present invention, is an explanatory diagram of the prior art. (1): Electrolytic deburring device, (2): Electrode,
(2a) - Through hole, (3) - Electrode holding part,
(4): Workpiece. (5): Workpiece holding part, (6): Vibrating part,
(7): Power supply section, (8): Electrolyte supply section, (9): Electrode rotation section. (10): Electrode guide section. Agent Patent Attorney Kensuke Chika Diagram 5 No. δ Condolences

Claims (8)

[Claims] (1) In an electrolytic deburring device that removes burrs generated at the intersection of multiple holes provided in a workpiece, an electrode holding part that holds a rod-shaped electrode and feeds it in the axial direction of the electrode. a workpiece holding section that holds the workpiece such that one hole selected from the plurality of holes is coaxial with the electrode held by the electrode holding section; an excitation unit that applies mechanical vibration to the object or the electrode in the axial direction of the electrode; a power supply unit that applies voltage so that the electrode becomes a negative electrode and the workpiece becomes a positive electrode; and the workpiece An electrolytic deburring device comprising: an electrolytic solution supply section that supplies an electrolytic solution to intersections of a plurality of holes. (2) The workpiece holding section includes an electrode rotating section that holds the electrode and rotates it around its axis, and an electrode guide section that places this electrode rotating section and guides it in the axial direction of the electrode so that it can move forward and backward. An electrolytic deburring device according to claim 1, characterized in that the device comprises: (3) The electrolyzer according to claim (1), wherein the workpiece holding section is provided so as to be movable forward and backward in the axial direction of the electrode, and the vibrating section is connected to the workpiece holding section. Deburring device. (4) In an electrolytic deburring method for removing burrs generated at intersections of a plurality of holes provided in a workpiece, the workpiece is held and one of the holes selected from the plurality of holes is removed. A method in which a rod-shaped electrode is inserted into a hole in the workpiece, a method in which a voltage is applied so that the electrode becomes a negative electrode and the workpiece becomes a positive electrode, and an electrode inserted into a hole in the workpiece or this electrode A method for electrolytic deburring, comprising: applying mechanical vibration in the axial direction of the electrode to a workpiece into which the electrode is inserted. (5) The electrolytic deburring method according to claim (4), wherein the electrode inserted into the hole of the workpiece is rotated about its axis. (6) A cylindrical main body made of conductive metal with a through hole provided in the axial direction, and an insulating part coated in a film form on the outer peripheral surface of the main body except for one end of the main body. The electrode is characterized in that one end portion of the main body portion to which the insulating portion is not attached includes a tapered portion provided on the end surface side of the main body portion and a parallel portion adjacent to the tapered portion. . (7) The electrode according to claim (6), wherein an insulating ring body is provided at the edge of the tapered portion. (8) The electrode according to claim (6), wherein the insulating portion is provided with an insulating stopper.