JPH074702B2 - Perforation electric discharge machine - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an electric discharge machining apparatus for piercing a workpiece with a tip of a piercing electrode.

[Prior art]

In the conventional perforating process, a perforating electrode which is previously formed into a required shape and size by drawing or the like is used, and the electric discharge perforating process is performed while guiding the electrode into a straight line or a curved line according to the perforating shape.

〔problem〕

In electrical discharge machining, there is usually electrode wear. It is not easy to accurately guide a long perforated electrode without any intermediate deformation, and it is usually deformed and bent. In particular, it is difficult to accurately guide such as when the wire diameter cross section is irregular.If such a guide is not accurate, the machining hole accuracy decreases and stable discharge cannot be performed, the machining speed decreases, and deep hole machining is not possible. It will be difficult.

[Means for Solving Problems] The present invention has been proposed in view of the above point, and in front of the object to be processed of the punching electrode, a forming electrode having a required cross-sectional shape is provided, A power source for punching is also used between the shaping electrode and the electrode for punching, or a power source for forming electric discharge machining of a separate punching electrode is provided, and the punching electrode is continuously formed on the way. It is characterized in that it is supplied as it is to the object to be processed and subjected to perforation processing.

〔Example〕

The present invention will be described below with reference to an embodiment of the drawings. In FIG. 1, reference numeral 1 is a base material of a perforated electrode, which is a long wire and is linearly guided by a plurality of guides 2 and 3 on the way. Reference numeral 4 denotes a feeding roller, which feeds while servoing with a servo motor 5. Reference numeral 6 denotes an electrode having a hole of a cross-sectional shape of a forming process, which penetrates the guided piercing electrode 1 in the hole, fixes a workpiece 7 at a portion penetrating the forming electrode 6, and pierces. The tip of the electrode 1 is processed so as to face it. 8
Is a hollow processing table for fixing the workpiece 7, and the servo motor 9
Thus, the workpiece 7 is subjected to the processing-following servo feed with respect to the punching processing electrode 1. Reference numeral 10 is provided between the forming electrode 6 and the forming electrode 6 for forming the perforating electrode 1, and a forming power source is used. Reference numeral 11 denotes a power source for punching, which is normally connected between the workpiece 7 and the machining electrode 1 in such a polarity that the workpiece 7 is a positive electrode. Of course, reverse polarity current may be applied depending on the processed material. Reference numeral 12 is a processing tank, which is divided into a support plate around the forming electrode 6 to separate the tank into two upper and lower stages and a pipe in the upper stage.
The working liquid is supplied from 13, and the liquid flowing down the shaping electrode 6 is supplied to the working portion of the workpiece 7. Of course, when a pipe electrode is used as the punching electrode 1, it is possible to make a jet flow in the pipe.

FIG. 2 is an upper sectional view of the molded electrode 6 having a desired hole shape.
A desired arbitrary hole such as a square, a circle, a broken line, etc. is formed in a die shape at the center of the electrode, and the hole is machined through the perforated electrode 1.

When the punching electrode 1 is fed from above, it is preferable that the upper and lower formed electrodes 6 and the workpiece 7 are arranged close to each other.

The servo motor 5 for feeding the punching electrode 1 uses the detection signal such as the voltage between the electrode 1 and the workpiece 7 for the servo motor 9 for feeding the electrode 1 and the shaping electrode 6 or the workpiece 7. And control. The drilling electrode 1 sent by the feeding roller 4 is guided by the guides 2 and 3,
First, the outer shape is formed so as to face the forming electrode 6. The wire electrode which has been processed to have a high shape accuracy has its tip portion directly penetrated through the shaped electrode 6 to face the object 7 to be machined, and electric discharge machining is performed on the aligned part of the object 7 to form a hole. . The shaped electrode 6 can be of any shape as shown in FIG. 2, and the workpiece 7 can be perforated in the same shape as the shaped electrode 6. Further, the forming electrode 6 can be arranged sufficiently close to the workpiece 7 and can be formed with high precision by electric discharge machining here, and the forming electrode 6 also serves as a guide for the machining electrode 1 which penetrates the forming electrode 6 with high precision. You can guide. Therefore, the processed hole formed at the tip of the punched electrode 1 can be formed straight and with high accuracy. Of course, depending on the guide shape of the electrode, a curved hole or the like can be arbitrarily processed.

The drilling processing electrode 1 can be used as a solid body or a pipe, and in the case of a pipe, a working fluid can be jetted from inside the pipe.
Improves processing stability. Further, when the outer shape of the electrode is circular, it is possible to perform processing while giving rotation, and it is possible to perform processing while rotating the workpiece 7.

Further, in the above-mentioned embodiment, the power source for forming the punching electrode and the power source for punching the workpiece are separately provided, but the power sources can be used together. In the case of combined use, a switching device is provided, the forming electrode 6 forms the required length of the hole forming electrode 1 to stop the feed of the through hole forming electrode 1, and the workpiece 7 is attached to the tip of the electrode. When the electrode 1 is consumed, the power is switched to perform the machining of the machining electrode 1 such that the machining of the workpiece 7 is performed and the machining of the machining electrode 1 is performed. It can be repeatedly processed alternately. Of course, alternately repeating the electrode forming and the drilling can be applied to the case where the two processing power sources are separately provided.

Further, since the processing amount by the forming electrode 6 is usually only a small amount of surface processing, when the forming process and the punching process are simultaneously performed, the processing state of the electrode processing gap is ignored and detected from the gap of the workpiece 7. It is possible to control the motor by the signal and perform the follow-up feed for machining.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, the present invention provides a forming electrode having a required overall mold cross-sectional shape in front of the object to be processed of the hole forming electrode in the hole forming process, and the forming electrode having the hole forming electrode It is characterized in that after the electric discharge is performed during the formation of the perforated electrode, the tip of the perforated electrode that has passed through the forming electrode directly faces the object to be perforated by electric discharge machining. Therefore, a simple electrode can be used as the piercing electrode, and the piercing of any cross-sectional shape can be easily and easily performed while molding the electrode.
Further, the electrode for electrode provided in front of the work piece serves as a guide when the punching electrode penetrates the electrode, so that the machining electrode can be stably and accurately guided to the shape as it is formed. It can be performed with high precision and high speed.

Therefore, according to the present invention, there is an effect that it can be widely applied to processing of a start hole for wire cut electric discharge machining, a wire drawing die, a fuel injection nozzle, a human silk nozzle, and other shaped holes.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an embodiment of the present invention, and FIG.
(B), (C), (D), and (E) are various examples of some of them. 1 …… Punching electrode 2,3 …… Guide, 5 …… Servomotor 6 …… Forming electrode 7 …… Workpiece 8 …… Processing table 9 …… Servomotor 10,11 …… Power supply 12 …… Machining Tank 13 ... Processing liquid supply pipe

Claims (1)

[Claims] 1. A perforation discharge for performing machining while performing a pulse discharge at a tip of a guided perforation machining electrode to a gap facing a workpiece and providing relative machining following feed between the perforation machining electrode and the workpiece. In the processing device, a forming electrode having a required overall mold cross-sectional shape is provided in front of the punching electrode facing the object to be processed, and a punching power supply is provided between the forming electrode and the punching electrode. Or a separate electric power source for electric discharge machining of a punching electrode is provided, and the electric discharge machining is performed so that the punching electrode formed by moving through the forming electrode faces the workpiece. A perforated electric discharge machine characterized by.