JPH07314258A - Working of bent hole and device therefor - Google Patents

Abstract

PURPOSE:To permit the control for the direction or shape for working without turning an electrode tool for working and enable the working for a complicatedly bent hole, obviating the necessity of a turning drive part for turning an electrode tool for working, in order to change the working direction or the shape of the worked hole, when the bent hole work is carried out by using the electrode tool for working. CONSTITUTION:When the bent hole working is carried out, a difference is generated between each working quantity of the working electrodes for working 8a and 8b by using the electrode tools for working which are provided with the working electrodes 8a and 8b which are electrically independent, and the work for directing the working direction in the drilling work to the side for the larger working quantity is carried out continuously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved hole machining method and a curved hole machining apparatus used for forming a curved hole in a material to be machined by electric current machining such as electric discharge machining or electrolytic machining.

[0002]

2. Description of the Related Art As a conventional bent hole drilling method and bent hole drilling apparatus, there is, for example, one shown in FIG. 10 of Japanese Patent Application No. 5-194878 and the drawings. In FIG. 10, a curved hole drilling device 10
1 shows a case where it is applied to an electrolytic processing machine 102, in which a rigid tool support member 104 formed in a tubular shape on a vertically moving main shaft (z axis) 3 provided in the electrolytic processing machine 102 is vertical by a stopper 105. It is attached in the direction of the direction.

The stator side of the rotary drive unit 106 is mounted on the lower end side of the tubular rigid tool support member 104, and the rotor side of the rotary drive unit 106 has a tubular electrically insulating flexible tool. A supporting member 107 is attached, and a machining electrode tool 108 is provided at the lower end of the tubular flexible tool supporting member 107.

The machining electrode tool 108 is shown in FIG.
As shown in an enlarged scale, the insulating member 111 having a partially spherical shape is provided at the lower end of the flexible tool supporting member 107 having a tubular shape.
Is fixed through the partial spherical pair in the inside of
The angle formed by the traveling direction of the machining electrode tool 108 and the exposed direction of the machining electrode tool 108 not covered by the insulating member 111 is constant and deviated. There is a difference in the machining amount with respect to the traveling direction, and in FIG. 11, the machining amount is slightly increased on the right side of the traveling direction.

The tubular flexible tool support member 1
A conductor (conducting wire) 112 that energizes the machining electrode tool 108 is provided inside 07, and a core wire 112 a of the conductor 112 is conductively connected to the surface of the machining electrode tool 108. At the same time, between the conductor 112 and the flexible tool support member 107, a machining liquid supply channel for supplying the machining liquid 113 to the machining portion is provided. The machining waste 15 is discharged together with the machining liquid 113 by utilizing the gap 116 formed between the machining hole (bent hole) 110 and the flexible tool support member 107.

An electric conductor (electrically conductive wire) 112 for energizing the machining electrode tool 108 passes through a tubular flexible tool support member 107, a rotary drive unit 106, and a tubular rigid tool support member 104. , Is connected to the cathode of the electrolytic processing machine 102.

Further, a tubular rigid tool support member 104
The upper part of the is sealed and the working fluid (electrolyte) 11
3 is a rigid tool support member 104 from the machining fluid supply pipe 118.
Then, the fluid is supplied to the machining site through the rotary drive unit 106, the machining fluid supply passage 114 in the flexible tool support member 107 having a tubular shape, and the machining fluid supply passage 108a in the machining electrode tool 108.

On the other hand, the material to be processed 120 is the electrolytic processing machine 10.
It is clamped to the base 121 of 2
The anode 122 of the electrolytic processing machine 102 is connected to 1.

When forming a curved hole using the curved hole machining apparatus 101 having such a structure, it is necessary to perform electrolytic machining while applying a feed speed corresponding to the machining amount to the main shaft (z axis) 103. The electrolytic processing is performed centering on the exposed portion of the processing electrode 108 that is not covered by the insulating member 111.

That is, the exposed side of the machining electrode tool 108 is machined more in the traveling direction of the machining electrode tool 108 due to the lowering of the main axis (z axis) 103, and the amount of machining of the gutter covered with the insulating member 111 is increased. Will be less.

When the main shaft (z-axis) 103 advances as it is, the covering portion of the insulating member 111 comes into contact with the crocodile, which has a small processing amount.

Here, the insulating member 111 is made of an electrically insulating material, and when it contacts the wall portion of the machining hole (bent hole) 110, the machining electrode tool 108 is supported by the flexible tool supporting member 107 having a tubular shape. Therefore, the open portion of the machining electrode tool 108 bends slightly (the exposed portion is bent), and when this machining is continued, the curved bent hole 1
10 is formed.

When it is desired to change the curvature of the curved hole during this machining, for example, as shown in FIG. 12, the machining tool 10 is attached to the lower end portion of the tubular flexible tool support member 107.
8 is provided, and a substantially semi-circular insulating member 111 is pivotally supported at the lower end of the tubular flexible tool supporting member 107, and this insulating member 111 rotates in the direction of arrow A. The flexible shaft member 125 is provided along the tubular flexible tool support member 107, and the lower end portion of the flexible shaft member 125 serving as an insulating member drive unit is connected to the insulating member 111. By moving the insulating member 111 in the direction of arrow A at the upper end portion thereof, not shown, and changing the position or amount of the portion of the processing electrode 108 not covered by the insulating member 111. The curvature or shape of the bent hole can be changed by using a bent hole processing device capable of changing the ratio of the exposed portion and the insulating portion of the processing electrode 108.

Further, in order to change the bending direction of the machining hole 110 to a direction deviating from the same plane, the machining electrode tool 108 is rotated in a direction intersecting the traveling direction thereof by the rotation drive of the rotation drive section 106. By moving it, it is possible to arbitrarily change the bending direction to a direction out of the same plane.

Further, as shown in FIG. 12, the rotation driving unit 10 is configured such that the ratio of the exposed portion of the machining electrode tool 108 and the insulating portion by the insulating member 111 is variable.
By rotating the machining electrode tool 108 in a direction intersecting the traveling direction by the rotational drive of 6, curved hole machining of any direction, curvature and shape can be performed.

[0016]

However, since such a conventional curved hole machining apparatus 101 has the above-mentioned configuration, it is necessary to change the machining direction or the machining hole shape by using the machining electrode tool. A rotary drive unit 106 for rotating 108 is required, and when the machining hole is complicatedly curved, it is difficult to follow the rotation of the flexible tool support member 107 and the machining electrode tool 108. Alternatively, there is a problem that the desired hole shape may not be obtained because it may not be possible to follow, and it has been a problem to solve these problems.

[0017]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is intended to change the machining direction or the machining hole shape when performing curved hole machining using a machining electrode tool. It does not require a rotation drive unit that rotates the machining electrode tool, and it is possible to control the machining direction or shape without rotating the machining electrode tool, and it is possible to machine complicated curved holes. It is an object of the present invention to provide a curved hole processing method and a curved hole processing device.

[0018]

A curved hole machining apparatus according to the present invention is a curved hole machining apparatus for machining a curved hole equipped with a machining electrode tool, and has two or more electrically independent machining electrodes. Is provided in the machining electrode tool.

The method of forming a curved hole according to the present invention is characterized in that when the curved hole is machined by using the machining electrode tool,
Alternatively, it is characterized in that there is a difference in the processing amount of two or more processing electrodes, and the processing in which the processing direction during drilling is directed toward the armour, which has a large processing amount, is continuously performed.

In the embodiment of the method for machining a curved hole according to the present invention, the voltage applied to two or more machining electrodes is made different so that the machining amount of each machining electrode is made different. In the same embodiment, when a voltage is applied to two or more processing electrodes, a voltage is applied to one processing electrode while no voltage is applied to another processing electrode. Similarly, in the embodiment, it is possible to adopt a configuration in which the voltage application time of the voltage applied to the two or more processing electrodes is made different. In the same embodiment, the current flowing from each electrode during the processing is previously set. The voltage applied to each processing electrode may be corrected so as to be equal to the measured proper current. In the same embodiment, 2 or 2 may be used.
It is possible to adopt a configuration in which the voltage application time of the voltage applied to the above-described processing electrodes is made different to give a difference in the processing amount of each processing electrode. In the same embodiment, two or more processing electrodes are provided. It is possible to make the voltage values applied to two or more processing electrodes the same when making different the voltage application time of the applied voltage to make the processing amount of each processing electrode different. In the embodiment, the voltage application time of the voltage applied to each processing electrode can be corrected so that the current flowing from each electrode during processing becomes equal to the integrated value of the proper current measured in advance. .

Further, in the embodiment of the curved hole machining apparatus according to the present invention, it is possible to provide a power supply control device for making a difference in voltage value applied to two or more machining electrodes. In the embodiment, when a voltage is applied to two or more processing electrodes, a voltage applying unit that does not apply a voltage to another processing electrode when applying a voltage to one processing electrode is provided in the power supply control device. In the same embodiment, the power supply control device may be provided with a voltage application time changing unit that makes the voltage application time of the voltage applied to the two or more processing electrodes different. Similarly, in the embodiment, voltage correction means for correcting the voltage applied to each processing electrode is provided so that the current flowing from each electrode during processing becomes an appropriate current measured in advance. The power source control device may be configured to be provided in the source control device, and in the same embodiment, the power source control is a machining control unit that controls the direction of drilling or the shape of the drilled hole by changing the voltage value applied to two or more machining electrodes. The apparatus may be provided with a configuration, and similarly, in the embodiment, a configuration is provided with a power supply control apparatus that makes the voltage values applied to two or two or more processing electrodes the same and gives different voltage application times. Similarly, in the embodiment, it is possible to adopt a configuration including a power supply control device that makes the voltage values applied to two or more processing electrodes the same and makes the voltage application time different. In order to make the current flowing from each electrode during machining equal to the integrated value of the appropriate current measured in advance, The power supply control device may be provided with the time correction means, and in the same embodiment, the direction of drilling or the shape of the drilled hole is controlled by changing the voltage application time of the voltage applied to the two or more processing electrodes. The power supply control device may be provided with the processing control means.

[0022]

Since the curved hole machining method and the curved hole machining apparatus according to the present invention have the above-mentioned configuration, the machining electrode tool is provided with two or more machining electrodes, and two or more machining electrodes are provided. By making a difference in the voltage value or voltage application time applied to the electrodes, the machining amount of each machining electrode becomes different, and the direction of forming holes during drilling is large. Therefore, the bending hole is formed by continuing such processing.

By changing the voltage value or the voltage application time applied to the two or more machining electrodes to change the machining amount of the two or more machining electrodes, the direction or shape of the machining hole can be arbitrarily changed. Since it is controlled and the direction or shape of the processing hole is arbitrarily controlled without rotating the processing electrode, the complicated curved curved hole is formed.

Further, the voltage applied to each machining electrode or the voltage application time is corrected so that the current flowing from each electrode during machining becomes equal to the proper current measured in advance or the integrated value of the proper current. As a result, the machining shape error that occurs when changing the direction of the curved hole in forming the curved hole is significantly reduced.

Further, in the case where a potential difference is generated between the processing electrodes, when a voltage is applied to two or more processing electrodes at the same time, a current flows between the processing electrodes, and the processing electrodes are Although it causes abrasion, the abrasion of the machining electrodes is suppressed by adopting a configuration in which no voltage is applied to the other machining electrodes when a voltage is applied to one machining electrode.

Similarly, when the voltage application time of the voltage applied to the two or more processing electrodes is made different so as to make the processing amount of each processing electrode different, the two or more processing electrodes are By making the applied voltage value the same,
Since there is no potential difference between the processing electrodes, no current flows between the processing electrodes, so that wear of the processing electrodes is suppressed.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a curved hole drilling apparatus used for carrying out the curved hole drilling method according to the present invention. The curved hole drilling apparatus 1 is applied to an electrolytic processing machine 2. In this case, a tubular rigid tool support member 4 is attached to a vertically movable main shaft (Z axis) 3 provided in an electrolytic processing machine 2 by a stopper 5 in a vertical direction.

A tubular flexible tool support member 7 is attached to the lower side of the tubular rigid tool support member 4, and the lower end of the tubular flexible tool support member 7 is for machining. An electrode tool 8 is provided.

The processing electrode tool 8 has a structure shown in FIG.
As shown in the enlarged view of FIG. 2, two electrically independent hemispherical processing electrodes 8a via a partial disk-shaped insulator 9 are provided.
8b is fixedly provided inside the partially spherical insulator 10. Since this machining electrode tool 8 is provided with two machining electrodes, it is used for machining two-dimensional curved holes.

The insulators 9 and 10 of the machining electrode tool 8 also play a role of preventing the machining electrode tool 8 and the workpiece W from coming into contact with each other or short-circuiting.
Depending on the shapes of a and 8b, the processing electrode 8 may be provided as necessary.
The surface insulator 11 may be added to the surfaces of a and 8b.

Inside the tubular flexible tool support member 7, there are provided conductors (conductor wires) 12 for energizing the working electrodes 8a, 8b, respectively. 12b is conductively connected to the processing electrodes 8a and 8b, respectively, and a current is prevented from flowing between the processing electrodes 8a and 8b via the processing liquid 14 inside the flexible tool supporting member 7. In order to prevent, processing electrodes 8a, 8
A back surface insulating layer 15 is provided on the back surface of b.

Further, the upper end of the tubular rigid tool supporting member 4 is in a closed state, and the working fluid 14 is injected from the working fluid supply pipe 16 into the tubular rigid tool supporting member 4 to be flexible. Via the machining liquid supply flow path 17 in the tool support member 7, from the back surface of the machining electrodes 8a, 8b to the machining electrode 8a,
It is supplied to the processing site of the workpiece through the processing liquid supply flow path 18 provided inside 8b.

At this time, the processing waste 1 generated by the processing
Reference numeral 9 denotes a machining waste discharge passage 21 formed by utilizing a gap between the machining hole (bent hole) 20 and the flexible tool support member 7.
Are discharged together with the working fluid 14.

Conductors (conducting wires) 12a and 12b for energizing the working electrodes 8a and 8b pass through the flexible tool supporting member 7 having a tubular shape and the rigid tool supporting member 4 having a tubular shape to supply power. It is connected to a control device (cathode of electrolytic processing machine) 22.

On the other hand, the workpiece W is clamped and fixed to the base 23 of the electrolytic processing machine 2, and the anode 24 of the electrolytic processing machine 2 is connected to the base 23.

In the curved hole machining apparatus 1 having such a structure, the machining electrode tool 8 has two machining electrodes 8a and 8b.
Since it is equipped with, it is used for forming a two-dimensional curved hole.

Here, the voltage value E1 applied to the processing electrodes 8a and 8b when the two-dimensional curved hole forming process is performed while the main shaft (z-axis) 3 is provided with the feed speed according to the processing amount.
, E2 and the voltage application times t1 and t2 are equal, as shown in FIG. 2, the processing electrodes 8a and 8b
Since the machining amounts are equal, the straight machining hole 20 is formed without bending the machining direction.

Further, as shown in FIG. 3, the processing electrode 8a
When the voltage E1 applied to the machining electrode 8b is made larger than the voltage E2 applied to the machining electrode 8b, the machining amount of the machining electrode 8a becomes larger than the machining amount of the machining electrode 8b, and the machining amount is changed in the hole forming direction. Although a large number of machining electrodes 8a are turned, the difference in the machining amount between the machining electrodes 8a and 8b is compared with the difference in the machining amount when the voltage E1 is applied only to the machining electrode 8a. Radius R of the machined hole 20
Is larger than the minimum radius of curvature Rmin that can be processed.

When different voltages E1 and E2 are applied to the processing electrode 8b and the processing electrode 8a, different voltages E1 and E2 are applied.
, And E2 at the same time, a potential difference is generated between the machining electrodes 8a and 8b via the machining liquid 14 between the machining electrode tool 8 and the workpiece W, so that a current flows between the machining electrodes. As a result, the machining electrodes 8b are abraded, so that as shown in FIG.
A voltage is applied to a and 8b, but not simultaneously.

Further, at the same time as providing a difference between the voltages E1 and E2 applied to the processing electrodes 8a and 8b, the voltage application time t1, t
It is also possible to change the curvature of the processing hole by changing 2 to make the processing amounts of the processing electrodes 8a and 8b different.

On the other hand, in the case where the voltage application times t1 and t2 of the voltages E1 and E2 applied to the processing electrodes 8a and 8b are made different, the applied radii E1 and E2 change although the radius of curvature of the processed hole 20 changes. Are set to the same voltage value, the potentials of the working electrodes 8a and 8b are equal, and no current flows between the working electrodes 8a and 8b. Therefore, the working electrodes 8a and 8b
It is possible to simultaneously apply the voltages E1 and E2 to. As an example, as shown in FIG. 5, a voltage E1 is applied to the processing electrode 8a.
Is continuously applied for the time t1, while the voltage E2 is intermittently applied to the machining electrode 8b whose machining amount is desired to be reduced, the curvature of the machining hole can be changed.

In this embodiment, the processing electrodes 8a, 8
By providing a difference between the voltages E1 and E2 applied to b or the voltage application times t1 and t2, the radius of curvature R of the machined hole 20 changed as shown in FIG. The horizontal axis represents the processing electrodes 8a, 8
It is the ratio E2 / E1 of the voltage values E1 and E2 applied to b or the ratio t2 / t1 of the voltage application times t1 and t2, and the vertical axis represents the processed hole 20.
Ratio R / Rmi of the radius of curvature R of R to the minimum radius of curvature Rmin that can be processed when a voltage is applied only to the processing electrode 8a.
It is indicated by n.

Next, Table 1 shows an example of machining conditions for machining using the curved hole machining apparatus 1 according to the present invention.

[0045]

[Table 1]

On the workpiece W made of S40C, curved holes on the same plane having an inner diameter of 8.5 to 9.0 mm and a radius of curvature R of 40 mm were machined by electrolytic machining. The machining electrode is divided into two parts, the material of the electrode is brass, and the diameter of the electrode is 6m.
m, and a sodium nitrate electrolytic solution was used as the working liquid. During processing, voltage E applied to processing electrodes 8a, 8b
1, E2 were set to 20 and 10 [V], respectively, and voltage application times t1 and t2 were both set to 2 [sec], and a voltage was alternately applied to the processing electrodes 8a and 8b to process the curved hole.

One of the causes of the machining shape error is that the machining direction of the curved hole during machining is changed. The machining electrode tool 8 in the curved hole machining apparatus 1 according to the present invention is a flexible tool that is curved during machining of a curved hole having a constant curvature (when the machining electrode 8a is bent). Since the restoring force of the support member 7 is used to perform processing while following the curved outer wall surface of the machining hole 20, the distance between the machining electrode 8a on the curved inner side of the curved hole and the wall surface of the machined hole 20 is equal to that of the curved hole. It is in a state of being wider than the distance between the processing electrode 8b on the outer side of and the wall surface of the processing hole 20.

As shown in FIG. 7, when the bending direction is changed so that the machining hole becomes 20c, the machining electrode tool 8 is used.
Becomes a state depending on the inside of the curve of the bent hole after the bending direction is changed (outside of the curve before the change of the bending direction), so that the distance between the processing electrode 8b on the inside of the curve and the wall surface of the processing hole 20 is curved. It is narrower than the distance between the machining electrode 8a outside and the wall surface of the machining hole 20.

However, the processing electrode 8 in electrolytic processing
The machining amount by a and 8b is larger when the distance between the machining electrodes 8a and 8b and the machining wall surface is narrower. Therefore, when the bending direction is changed, the machining electrode tool 8 is in an appropriate position. Compared with the state (a state that follows the outside of the curve of the bend), the amount of processing on the inside of the curve of the bend hole increases and a shape error occurs such that the radius of curvature R of the bend decreases.
The processed hole 20d is formed.

Therefore, a method for obtaining a machined hole having a desired curvature by calibrating the machining electrode tool 8 and correcting the voltage value or the voltage application time applied to the machining electrodes 8a and 8b will be described.

First, the machining electrode of the machining electrode tool 8 is M
A method of calibrating the machining electrode tool 8 when it is divided into pieces will be described.

A voltage ratio En between the voltage applied to a certain working electrode as a reference and the voltage applied to the m-th working electrode
Or, a curved hole is drilled at a time ratio tn of the voltage application time of the voltage to the reference machining electrode and the voltage application time of the voltage applied to the m-th machining electrode, and the m-th hole is formed during the machining. The current Inm flowing between the processing electrode and the workpiece W is measured. However, 1 ≦ m ≦ M. After processing, measure the radius of curvature Rn of the processed hole and
Is defined as an appropriate current flowing between the m-th processing electrode and the workpiece W when processing the radius of curvature Rn. In addition, the ratio of the current flowing through a certain processing electrode as a reference at this time to the proper current Inm is defined as Hnm, and further, the proper current Inm is further defined.
Is defined as Inm ', and the ratio of the integrated value of the current flowing through a certain working electrode as a reference to the integrated value Inm' of this appropriate current Inm is defined as Hnm '.

During machining, when the bending direction is changed and the machining radius Rn of the machining hole is machined, in the section until the machining electrode tool follows the outer wall surface of the curve of the machining hole, the m-th The voltage applied to the machining electrode is corrected so that the current flowing through the machining electrode becomes equal to the proper current value Inm obtained by calibration, or the ratio of the flowing current becomes equal to Hnm. . Alternatively, the integrated value of the current flowing through the m-th processing electrode becomes equal to the integrated value Inm ′ of the proper current Inm, or
The voltage application time is corrected such that the time ratio is such that the ratio of the reference machining electrode and the integrated value of the current flowing through the m-th machining electrode becomes equal to Hnm '.

By performing this correction simultaneously for each processing electrode (1 to M), it is possible to reduce the shape error that occurs when the direction of the curved hole is changed.
A processed hole having a desired shape is formed.

In the case where there are two processing electrodes 8a and 8b, the desired processed hole 20c can be obtained.

In the present embodiment, the above correction method has been described as applied to the case where the processing direction of the curved hole is changed. However, due to some cause, for example, deterioration of the surface of the processing electrode, the processing electrode is processed. It is also effective when the current flowing from the device is not normal.

FIG. 8 shows a curved hole drilling apparatus 1 according to the present invention.
It shows another embodiment of the machining electrode tool 8 used for the above, and is provided with four electrically independent machining electrodes 8a, 8b, 8c and 8d via a partial disk-shaped insulator 9. A machining electrode tool used for forming a three-dimensionally curved hole.

When the same voltage is applied to the machining electrodes 8a and 8d, the machining electrode tools 8a and 8b move in the + X direction.
When a voltage of the same value is applied to, holes that are bent in the + Y direction can be processed, and four processing electrodes 8
By making an appropriate difference in the voltage value or the voltage application time applied to a, 8b, 8c, and 8d, it is possible to drill a hole having an arbitrary radius of curvature in an arbitrary direction.

FIG. 9 shows a bent hole drilling apparatus 1 according to the present invention.
Another embodiment of the machining electrode tool 8 used for the above is shown, in which the machining electrode is electrically isolated by four partial disk-shaped insulators 9a, 9b and 9c. It is divided into processing electrodes 8a, 8b, 8c and 8d. At this time, the bending radius of the machining hole is switched by setting the desired radius of curvature of the machining hole by the division angle of the machining electrodes 8a, 8b, 8c and 8d and selecting the machining electrode to which the voltage is applied as appropriate. Is possible. By using such a processing electrode tool 8, the power supply control device 22 can be simplified.
In this embodiment, the number of divisions is four, but the number may be increased or decreased as necessary.

The curved hole machining apparatus 1 according to the present invention.
In the present embodiment, the case where it is applied to the electrolytic processing machine 2 is shown, but it can also be applied to other processing methods or processing apparatuses such as an electric discharge machine.

[0061]

As described above, according to the curved hole machining method and the curved hole machining apparatus of the present invention, the machining electrode tool is provided with two or more machining electrodes, and two or more machining electrodes are provided. By making a difference in the voltage value applied to the processing electrode or the voltage application time to give a difference in the processing amount of two or more processing electrodes, the hole forming direction at the time of drilling has a large processing amount. It is suitable for cutting electrodes, and by performing such processing continuously, it is possible to form curved holes. Also, by changing the voltage value or voltage application time applied to each processing electrode, each processing electrode By changing the machining amount of, it becomes possible to control the direction or shape of the machining hole arbitrarily, and it is possible to control the direction or shape of the machining hole arbitrarily without rotating the machining electrode. Intricately curved Excellent effect that formation processing bend hole becomes possible to obtain.

Further, the voltage applied to each machining electrode or the voltage application time is corrected so that the current flowing from each electrode during machining becomes equal to the proper current measured in advance or the integrated value of the proper current. As a result, it is possible to significantly reduce the processing shape error that occurs when the direction of the bent hole is changed in forming the bent hole.

Further, in the case where a potential difference is generated between the processing electrodes, when a voltage is applied to two or more processing electrodes at the same time, a current flows between the processing electrodes, so that the processing electrodes are Although it causes wear, it is possible to suppress wear of the machining electrodes by applying a voltage to one machining electrode while applying no voltage to the other machining electrodes. A configuration in which the voltage values applied to two or more processing electrodes are the same when the voltage application times of the voltages applied to the two or more processing electrodes are made different so that the processing amounts of the respective processing electrodes are made different. By doing so, since there is no potential difference between the processing electrodes, a current does not flow between the processing electrodes, so that abrasion of the processing electrodes can be suppressed.

Further, since it is possible to control the machining hole shape without rotating the machining tool, it is possible to provide a plurality of machining electrode tools in one electrolytic machining machine, resulting in high efficiency. The excellent effect that curved hole machining is possible is obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a basic configuration of a curved hole drilling device used for carrying out a curved hole drilling method according to the present invention.

FIG. 2 is an explanatory view showing an embodiment of a machining electrode tool used in the curved hole machining device according to the present invention.

FIG. 3 is an explanatory view showing a state of hole drilling by the machining electrode tool in FIG.

FIG. 4 is a diagram showing an example of a voltage value applied to a processing electrode and a voltage application time.

FIG. 5 is a diagram showing another example of the voltage value applied to the processing electrode and the voltage application time.

FIG. 6 is a diagram showing a relationship between a radius of curvature of a bent hole and a voltage value or voltage application time applied to a processing electrode.

FIG. 7 is an explanatory diagram showing how a shape error occurs when the processing direction is changed.

FIG. 8 is an explanatory view showing another embodiment of the machining electrode tool used in the curved hole machining device according to the present invention.

FIG. 9 is an explanatory view showing still another embodiment of the machining electrode tool used in the curved hole machining device according to the present invention.

FIG. 10 is an explanatory diagram showing an example of a conventional bent hole machining device.

FIG. 11 is an explanatory diagram showing an example of a conventional machining electrode tool.

FIG. 12 is an explanatory diagram showing another example of a conventional machining electrode tool.

[Explanation of Codes] 1 Bending Hole Machining Device 2 Electrolytic Machining Machine 3 Spindle (Z Axis) 4 Rigid Tool Support Member 5 Stopper 7 Flexible Tool Support Member 8 Machining Electrode Tool 8a-8d Machining Electrode 9 Partial Disc Insulator 10 Partially spherical insulator 11 Surface insulator 12 Conductor 14 Machining liquid 16 Machining liquid supply pipe 17 Machining liquid supply flow path 18 Machining liquid supply flow path (in machining electrode) 19 Machining waste 20 Machining hole 21 Machining Waste discharge flow path 22 Power supply control device 23 Base of electrolytic processing machine 24 Anode of electrolytic processing machine W Workpiece material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sadazaki Shiro Shiro, 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.

Claims (17)

[Claims] 1. A curved hole drilling device that is provided with a machining electrode tool for performing a bent hole machining, wherein the machining electrode tool is provided with two or more electrically independent machining electrodes. Curved hole processing device. 2. When performing curved hole machining using the machining electrode tool according to claim 1, the machining directions of two or more machining electrodes are made different, and the machining direction at the time of drilling A curved hole drilling method that is characterized by continuously performing a lot of drilling. 3. The method for machining a curved hole according to claim 2, wherein the machining voltage of each machining electrode is varied by providing a difference in voltage value applied to two or more machining electrodes. 4. When applying a voltage to two or more processing electrodes, when a voltage is applied to one processing electrode, no voltage is applied to the other processing electrodes. The method for forming a curved hole according to Item 3. 5. The method for machining a curved hole according to claim 4, wherein the voltage application time of the voltage applied to the two or more machining electrodes is also made different. 6. The voltage applied to each machining electrode is corrected so that the current flowing from each electrode during machining becomes equal to an appropriate current measured in advance. Curved hole processing method described in crab. 7. The bent hole according to claim 2, wherein the voltage application time of the voltage applied to the two or more processing electrodes is made different so that the processing amount of each processing electrode is made different. Processing method. 8. The curved hole machining according to claim 7, wherein, when a voltage is applied to two or more processing electrodes, the voltage values applied to the two or more processing electrodes are the same. Method. 9. The voltage application time of the voltage applied to each machining electrode is corrected so that the current flowing from each electrode during machining becomes equal to the integrated value of the proper current measured in advance. The curved hole drilling method according to claim 7. 10. The curved hole drilling device according to claim 1, further comprising a power supply control device that gives a difference in voltage value applied to two or more machining electrodes. 11. A power supply control device comprising a voltage applying means for applying a voltage to one processing electrode when applying a voltage to two or more processing electrodes and not applying a voltage to another processing electrode. The bent hole drilling device according to claim 10, wherein the bent hole drilling device is provided. 12. The power supply control device is provided with a voltage application time changing means for varying a voltage application time of a voltage applied to two or more processing electrodes.
The curved hole drilling device according to 1. 13. The power supply control device is provided with a voltage correction means for correcting the voltage applied to each processing electrode so that the current flowing from each electrode during processing becomes an appropriate current measured in advance. The curved hole drilling device according to any one of claims 10 to 12. 14. The power supply control device is provided with a machining control means for controlling a direction of drilling or a shape of a drilled hole by changing a voltage value applied to two or more machining electrodes. The curved hole drilling device according to any one of 13 above. 15. The curved hole drilling process according to claim 1, further comprising a power supply control device that makes the voltage values applied to two or more processing electrodes the same and gives different voltage application times. apparatus. 16. A power source control means for correcting voltage application time for correcting voltage application time to each processing electrode so that current flowing from each electrode during processing becomes equal to an integrated value of proper current measured in advance. The curved hole drilling device according to claim 15, which is provided in the device. 17. The power supply control device is provided with a machining control means for controlling a direction of drilling or a shape of a drilled hole by changing a voltage application time of a voltage applied to two or more machining electrodes. Item 15. The curved hole drilling device according to Item 15 or 16.