JPS62208830A - Fine hole electric discharge machine - Google Patents

Abstract

PURPOSE:To allow high-precision and high-speed machining of a different-shape hole and a deep hole by providing a formed cross section shape molding electrode before a bore machining electrode and a work meet together and providing a mold machining power supply and a bore machining power supply jointly or separately. CONSTITUTION:A bore machining electrode 1 is guided by a feed roller 4 via guides 2, 3, and its outer shape is mold-machined by a molding electrode 6. Immediately after the bore machining electrode 1 penetrates the molding electrode 6, it faces a work 7 arranged nearby, and bore machining with the same shape as the molding electrode 6 is performed. A mold machining power supply 10 and the bore machining electrode 1 and connected as a positive electrode for the molding electrode 6, and a bore machining power supply 11 and the work 7 and connected as a positive electrode for bore machining. Or, one power supply can be switched for mold machining and bore machining in turn. Accordingly, the bore machining electrode 1 molded by the molding electrode 6 is immediately used for machining using the molding electrode 6 as a guide, thus stably and correctly guided high-precision and high-speed boring can be performed.

Description

[Detailed description of the invention] The present invention relates to an electric discharge machining device for machining small holes.

[Prior art]

Conventional fine hole machining uses a thin wire electrode that has been formed into a desired shape and size by wire drawing or the like in advance, and is guided in a straight line or curved shape depending on the hole shape during discharge hole machining.

〔problem〕

In electrical discharge machining, there is usually electrode wear. It is not easy to accurately guide a long thin wire electrode without deforming it along the way, and it is usually accompanied by deformation and bending. Accurate guidance is difficult, especially when the wire diameter cross section is irregularly shaped, and when such guidance is not accurate, the accuracy of the machined hole decreases and stable electrical discharge is not possible, the machining speed decreases, and deep hole machining becomes difficult. It becomes difficult.

[Means for solving problems]

The present invention has been proposed in view of this point, and includes providing a forming electrode having a desired general cross-sectional shape on the front side of the thin wire processing electrode facing the workpiece, and connecting the forming electrode with the thin wire. Either use a power source for fine wire machining between the machining electrode, or provide a separate power source for forming electric discharge machining for the fine wire machining electrode, and supply the thin wire machining electrode continuously to the workpiece while being formed midway. It is characterized in that it is perforated with a hole.

〔Example〕

The present invention will be explained below with reference to an embodiment of the drawings.

In FIG. 1, reference numeral 1 denotes a base material of a thin wire-processed electrode, which uses a length 6 wire rod and is linearly guided by a plurality of guides 2 and 3 along the way. Reference numeral 4 denotes a feeding roller, which is fed while being servoed by a servo motor 5. Reference numeral 6 denotes an electrode having a molded hole with a male cross-sectional shape, the guided thin wire processed electrode 1 is passed through the hole, a workpiece 7 is fixed to the part that has passed through the formed Ti electrode 6, and the thin wire Processing is performed with the tips of the processing electrodes 1 facing each other. 8 is a hollow processing table that fixes the workpiece 7;
A servo motor 9 applies machining follow-up servo feed of the workpiece 7 upward to the fine wire machining electrode 1 . Reference numeral 10 denotes a power source for forming, which is provided between the thin wire processing electrode 1 and the forming electrode 6 to form the thin wire processing electrode 1, and is normally energized with the processing electrode 1 as the positive electrode.

Reference numeral 11 denotes a power source for pore machining, which is normally connected between the workpiece 7 and the processing electrode 1 with the workpiece 7 as the positive electrode. Of course, reverse polarity energization may occur depending on the material to be processed. 1
2 is a processing tank, the area around the molded electrode 6 is partitioned by a support plate, the tank is divided into upper and lower stages, and a pipe 13 is installed in the upper stage.
The machining liquid is supplied from the molded electrode, and the liquid flowing down the molded electrodes is supplied to the machining portion of the workpiece 7. Of course, when a pipe electrode is used as the pore machining electrode 1, it is possible to use a jet flow inside the pipe.

FIG. 2 is a top sectional view of a molded electrode 6 having a desired hole shape.
A desired arbitrary hole such as a square, circle, broken line, etc. is formed in the center of the electrode in the shape of a die, and the thin wire-processed electrode 1 is penetrated through this hole to be formed.

When feeding and processing the thin wire processing electrode 1 from above, it is preferable that the forming electrode 6 and the workpiece 7 formed above and below are arranged as close as possible.

The turbo motor 5 that feeds the thin wire processing electrode 1 uses detection signals such as voltage between the electrode 1 and the forming electrode 6, or the servo motor 9 that feeds the workpiece 7 between the electrode 1 and the workpiece 7. control. The fine wire processed electrode 1 sent by the feeding roller 4 is guided by the guide 2.3 while
First, the outer shape of the electrode 6 is molded facing the molded electrode 6. The wire electrode, which has been processed to have a highly accurate shape, passes through the shaped electrode 6 with its tip end facing the workpiece 7, and performs electrical discharge machining to make a hole in the aligned part of the workpiece 7. . The shaped electrode 6 can have any shape as shown in FIG. 2, and the workpiece B can be perforated to have the same shape as the shaped electrode 6. In addition, the shaped electrode 6 can be placed sufficiently close to the workpiece 7, and is formed with high precision by electrical discharge machining.The shaped electrode 6 also serves as a guide for the machined electrode 1 that passes through it, so that it can be formed with high precision. can guide you. Therefore, the hole to be machined at the tip of the wire electrode 1 can be formed straight with high accuracy. Of course, depending on the guide shape of the electrode, a bent hole or the like can be formed as desired.

The K@ wire machining electrode 1 can be used as a solid body or as a pipe, and in the case of a pipe, a jet of machining liquid can be generated from within the vibrator, improving machining stability. Further, when the electrode has a circular outer shape, processing can be performed while applying rotation, and the workpiece 7 can be processed while being rotated.

Further, in the above embodiment, the power source for forming the thin wire processing electrode and the power source for forming the fine holes in the workpiece are provided separately, but the power source can be used in combination. In the case of dual use, a switch is installed, the forming electrode 6 is used to form the thin wire electrode 1 to the required length, the feeding of the penetrating thin wire processing electrode 1 is stopped, and the workpiece 1 is placed at the tip of the electrode. Send workpiece 7
Then, when the electrode 1 is consumed, the power source is switched and the processing electrode 1 is formed.Thus, electrode forming and punching are repeated alternately by switching the power source and processing feed. be able to.

In addition, since the amount of machining by the forming electrode 6 is usually only a small amount of surface machining, when forming and punching are performed simultaneously, the machining state of the forming gap is ignored and detection is performed from the gap of the workpiece 1. The motor can be controlled by the generated signal to carry out follow-up feeding and machining.

〔Effect of the invention〕

As described above, the present invention provides a molding electrode having a required male cross-sectional shape in front of the m-line processing electrode facing the workpiece during fine-hole processing, and the forming electrode is used to perform the fine-wire processing. A feature is that after forming a fine wire machining electrode by generating electric discharge between the electrode and the electrode, the tip of the fine wire machining electrode that has passed through the forming electrode is faced to the workpiece and a fine hole is machined by electric discharge machining. Therefore, a simple electrode can be used as the pore-machining electrode, and pores of any cross-sectional shape can be easily and easily formed while molding the electrode.

In addition, the forming Ti electrode provided in front of the workpiece becomes a guide when the thin wire processing electrode passes through it, and the processing electrode can be stably and accurately guided to the shape as formed, thereby making it possible to perform the drilling process. can be carried out with high sheath density and high speed.

Therefore, the present invention has the effect that it can be widely applied to machining of starting holes for wire-cut electric discharge machining, wire drawing dies, fuel injection nozzles, silk nozzles, irregularly shaped nozzles, and the like.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of an embodiment of the present invention, and Figure 2 (A) (
B) (C) (D) (E) are diagrams of some various embodiments. 1... Electrode for fine wire processing 2.3... Guide 5... Servo motor 6... Forming Electrode 7... Workpiece 8... Processing table 9... Servo motor io, i1... Power supply 12... Processing tank 13... Machining fluid supply pipe patent
Applicant Kiyoshi Inoue, representative of Inoue Japax Laboratory Co., Ltd. 1, Indication of the case, 1988 Patent Application No. 50.205 2, Title of the invention: Drilling electrical discharge machining device 3, Relationship with the person making the amendment Patent application Address 5289 Michisho, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa Prefecture Name (048) Inoue Japax Co., Ltd. Q-sho 4
, the number of inventions that will increase due to the amendment is “0”,
I'm going to go to bed. (2) Amend the full text for the specification as shown in the attached sheet. Amended Description 1, Title of the Invention, Drilling Electrical Discharge Machining Apparatus 2, Claims While performing a pulse discharge with the tip of the guided drilling electrode in the gap facing the workpiece, the process is performed between the drilling electrode and the workpiece. In a drilling electric discharge machining device that performs machining while giving a relative machining follow-up feed to the material, a forming electrode having a desired male cross-sectional shape is provided in front of the drilling electrode facing the workpiece, and the forming electrode A power supply for drilling or a separate power supply for forming electrical discharge machining of the drilling electrode is provided between the drilling electrode and the drilling electrode, and a power supply for forming electrical discharge machining of the drilling electrode is also used or the separate drilling electrode is connected to the workpiece. A drilling electric discharge machining device characterized in that electric discharge machining is performed while facing the. 3. Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to an electrical discharge machining apparatus that performs drilling on a workpiece using the tip of a drilling electrode. [Prior art] Conventional drilling uses a drilling electrode that has been previously formed into the required shape and dimensions by wire drawing, etc., and guides it in a straight line or curved shape according to the drilling shape while electrical discharge drilling is performed. There is. [Problem] In electrical discharge machining, electrode wear usually occurs. It is not easy to accurately guide a long perforated electrode without deforming it along the way, and it is usually accompanied by deformation and bending. Accurate guidance is difficult, especially when the wire diameter cross section is irregularly shaped, and such guides are not accurate, resulting in a decrease in the accuracy of the hole being drilled, and stable electrical discharge, which reduces the machining speed and makes deep hole machining difficult. It becomes difficult. [Means for solving the problem] The present invention has been proposed in view of the above points, and includes providing a forming electrode with a required male cross-sectional shape on the front side of the drilling electrode facing the workpiece, A power supply for drilling is also used between the forming electrode and the drilling electrode, or a separate power supply for forming electric discharge machining of the drilling electrode is provided, and the drilling electrode is continuously formed in the middle. This is characterized in that the material is fed directly to the workpiece to perform the perforation process. [Example] The present invention will be explained below with reference to an example of the drawings. In FIG. 1, reference numeral 1 denotes the base material of the perforated electrode, which is made of a long wire and is linearly guided along the way by a plurality of guides 2 and 3. Reference numeral 4 denotes a feeding roller, which is fed while being servoed by a servo motor 5. Reference numeral 6 denotes an electrode having a hole having a male cross-sectional shape for molding, the guided perforation electrode 1 is passed through the hole, a workpiece 7 is fixed to the part that has passed through the molding electrode 6, and the perforation is performed. The tips of the electrodes 1 are processed so as to face each other. Reference numeral 8 denotes a hollow processing table on which the workpiece 1 is fixed, and a servo motor 9 applies machining-following servo feed of the workpiece 1 upward to the drilling electrode 1 . Reference numeral 10 denotes a power supply for forming, which is provided between the perforating electrode 1 and the forming electrode 6 to form the perforation electrode 1, and is normally energized to the polarity with the processing electrode 1 as the positive electrode. Reference numeral 11 denotes a power source for drilling, which is normally connected between the workpiece 7 and the machining electrode 1 with the workpiece 7 as the positive electrode. Of course, reverse polarity energization may occur depending on the material to be processed. 1
2 is a processing tank, the area around the molded electrode 6 is partitioned by a support plate, the tank is divided into upper and lower stages, and a vibrator 13 is installed in the upper stage.
A machining liquid is supplied from the molding electrode 6, and the liquid flowing down the molded electrode 6 is supplied to the machining portion of the workpiece 7. Of course, when a pipe electrode is used as the perforation electrode 1, it is possible to use a jet flow inside the pipe. FIG. 2 is a top sectional view of a molded electrode 6 having a desired hole shape.
Form any desired hole in the center of the electric bridge, such as a square, circle, broken line, etc., in the shape of a die, and then perform the drilling process T.
Molding is performed by penetrating through iff1l. When feeding the drilling electrode 1 from above, it is preferable that the molded electrode 6 and the workpiece 7 formed above and below are arranged as close as possible. A servo motor 5 provides feed to the drilling electrode 1. A servo motor 5 provides feed to the electrode 1 and the forming electrode 6 or to the workpiece 7. 9 uses detection signals such as voltage between the electrode 1 and the workpiece 1. and control. While being guided by guides 2 and 3, the perforating electrode 1 sent by the feeding roller 4 is first subjected to forming into an external shape facing the forming ff1ff16. The wire electrode, which has been processed to have a highly accurate shape, passes through the shaped electrode 6 with its tip end facing the workpiece 7, and performs electrical discharge machining to make a hole in the aligned part of the workpiece 7. . The shaped electrode 6 can have any shape as shown in FIG. 2, and the workpiece 7 can be perforated to have the same shape as the shaped electrode 6. In addition, the shaped electrode 6 can be placed sufficiently close to the workpiece 7, and is formed with high precision by electrical discharge machining.The shaped electrode 6 also serves as a guide for the machined electrode 1 that passes through it, so that it can be formed with high precision. can guide you. Therefore, the hole to be machined with the tip of the drilling electrode 1 can be formed straight and with high precision. Of course, depending on the guide shape of the '11 pole, a bent hole etc. can be formed as desired. In addition, the perforated layer 4f! 1 can be used as a solid body or a pipe, and in the case of a vibrator, the machining liquid can be jetted from inside the vibrator,
Improve processing stability. Further, when the electrode has a circular outer shape, processing can be performed while applying rotation, and the workpiece 7 can be processed while being rotated. Further, in the above embodiment, the power supply for forming the perforation electrode and the power supply for perforation of the workpiece are provided separately, but the power supply can be used in combination. In the case of dual use, a switch is installed, the forming electrode 6 is used to form the perforation electrode 1 to the required length, the feeding of the perforation electrode 1 is stopped, and the workpiece 7 is placed at the tip of the electric bridge. When the electrode 1 is exhausted, the power supply is switched and the processing electrode 1 is formed. By switching, processing can be repeated alternately. Of course, the process of alternatingly repeating electroforming and perforation can also be applied to the case where the two processing power sources described above are provided separately. In addition, since the part processed by the forming electrode 6 is usually only surface processing of a microscopic base, when forming and drilling are performed simultaneously, the processing state of the forming gap is ignored and detected from the gap of the workpiece 7. The motor can be controlled by the generated signal to perform follow-up feeding and machining. [Effects of the Invention] As described above, the present invention provides a forming electrode with a required male cross-sectional shape in front of the drilling electrode facing the workpiece in the drilling process, and the forming electrode is used to perform the above-mentioned After forming the perforating electrode by applying electrical discharge between it and the perforating electrode, the tip of the perforating electrode that has passed through the forming electrode is faced to the workpiece and perforated by electric discharge machining. Because of this feature, a simple electrode can be used as the perforation electrode, and while it is being molded, perforation of any cross-sectional shape can be easily performed. or,
The forming electrode provided in front of the workpiece becomes a guide when the drilling electrode passes through it, and the processing electrode can be stably and precisely guided to the shape as formed.This allows the drilling process to be carried out with high precision. can be performed at high speed. Therefore, the present invention has the effect of being widely applicable to drilling start holes for wire-cut electrical discharge machining, wire drawing dies, fuel injection nozzles, silk nozzles, and other machining of interfacial holes. 4. Brief explanation of the drawings Figure 1 is a configuration diagram of one embodiment of the present invention, and Figure 2 (A), (B), (C), (D), and (E) are diagrams of various embodiments of some of the same. . 1... Electrode for drilling 2.3... Guide 5... Servo motor 6... Molding Electrode 7...Workpiece 8...Processing table

Claims (1)

[Claims] In a small-hole electrical discharge machining device that processes the tip of a guided fine wire machining electrode in a gap facing the workpiece while applying a relative machining follow-up feed between the fine wire machining electrode and the workpiece. A forming electrode having a desired overall cross-sectional shape is provided on the front side of the thin wire processing electrode facing the workpiece, and a power source for pore processing is also used between the forming electrode and the thin wire processing electrode. Alternatively, a separate power source for forming electric discharge machining of the thin wire machining electrode is provided, and the thin wire machining electrode that has been formed by moving past the forming electrode is subjected to electric discharge machining while facing the workpiece. Pore electrical discharge machining equipment.