JPH0355253B2 - - Google Patents
Info
- Publication number
- JPH0355253B2 JPH0355253B2 JP3599184A JP3599184A JPH0355253B2 JP H0355253 B2 JPH0355253 B2 JP H0355253B2 JP 3599184 A JP3599184 A JP 3599184A JP 3599184 A JP3599184 A JP 3599184A JP H0355253 B2 JPH0355253 B2 JP H0355253B2
- Authority
- JP
- Japan
- Prior art keywords
- workpiece
- electrode
- discharge machining
- electrical discharge
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000009760 electrical discharge machining Methods 0.000 claims description 19
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000003754 machining Methods 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
- B23H1/022—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges for shaping the discharge pulse train
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
【発明の詳細な説明】
産業上の利用分野と従来技術
本発明は、放電加工におけるワークと電極間に
正負の電圧を印加する放電加工電源に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application and Prior Art The present invention relates to an electrical discharge machining power source that applies positive and negative voltages between a workpiece and an electrode in electrical discharge machining.
従来技術と発明の目的
放電加工において、水等の電解性の加工液を使
用すると電気分解作用が生じる。特に、超硬合金
のような電食性のワークを荒加工する場合などは
電食が生じ、ワークを脆くする等の欠点があつ
た。また、セカンドカツト時においては、電気分
解作用のために粒子の選択電食によりワークの表
面が荒れて仕上面の荒さが悪くなる等の欠点があ
つた。これらの欠点は、非加工時に電極とワーク
間のギヤツプに加工時とは逆に逆電圧を印加する
ことによつて改善できることが知られており、
種々の方法が存在するが、本発明は、このワーク
と電極間に、簡単な回路によつて正負の電圧を印
加できるようにした放電加工電源を提供すること
にある。Prior Art and Purpose of the Invention When an electrolytic machining fluid such as water is used in electrical discharge machining, electrolysis occurs. In particular, when rough machining a workpiece that is susceptible to electrolytic corrosion, such as cemented carbide, electrolytic corrosion occurs, making the workpiece brittle. Further, during the second cutting, there were drawbacks such as selective electrolytic corrosion of particles due to electrolysis, which roughened the surface of the workpiece, resulting in poor finished surface roughness. It is known that these drawbacks can be improved by applying a reverse voltage to the gap between the electrode and the workpiece during non-processing, contrary to that during processing.
Although various methods exist, the object of the present invention is to provide an electrical discharge machining power source that can apply positive and negative voltages between the workpiece and the electrodes using a simple circuit.
発明の構成
本発明は、電極とワーク間に電圧を印加し放電
させて加工を行う放電加工の放電加工電源におい
て、上記電極とワークで構成される放電加工部に
直列にコンデンサを接続し、該放電加工部とコン
デンサの直列回路に抵抗を直列に接続した直流回
路の両端に直流電源を接続し、上記コンデンサと
上記放電加工部の直列回路と並列にスイツチング
素子を接続し、該スイツチング素子のオン・オフ
により上記電極とワーク間に正負の電圧を印加で
きるように構成した放電加工電源である。Structure of the Invention The present invention provides an electrical discharge machining power supply for electrical discharge machining in which a voltage is applied between an electrode and a workpiece to cause discharge, and a capacitor is connected in series to an electrical discharge machining section composed of the electrode and the workpiece. A DC power supply is connected to both ends of a DC circuit in which a resistor is connected in series to the series circuit of the electrical discharge machining section and the capacitor, and a switching element is connected in parallel to the series circuit of the capacitor and the electrical discharge machining section, and the switching element is turned on. - This is an electrical discharge machining power supply configured so that positive and negative voltages can be applied between the electrode and the workpiece when turned off.
実施例
第１図は、本発明の一実施例で、Ｅは直流電
源、Ｒは電流制限用の抵抗、Ｔはスイツチング素
子としてのトランジスタ、Ｇは該トランジスタの
ベース、Ｃはコンデンサ、Ｐは電極、Ｗはワーク
であり、電極ＰとワークＷで構成される放電加工
部にコンデンサＣが直列に接続され、さらにコン
デンサＣの他端には電流制限用の抵抗Ｒが接続さ
れ、放電加工部、コンデンサＣ、抵抗Ｒの直列回
路の両端に直流電源Ｅが接続されている。さら
に、上記放電加工部とコンデンサＣの直列回路と
並列にトランジスタＴが接続されている。Embodiment FIG. 1 shows an embodiment of the present invention, where E is a DC power supply, R is a current limiting resistor, T is a transistor as a switching element, G is the base of the transistor, C is a capacitor, and P is an electrode. , W is a workpiece, a capacitor C is connected in series to the electrical discharge machining section composed of the electrode P and the workpiece W, and a resistor R for current limiting is connected to the other end of the capacitor C. A DC power source E is connected to both ends of a series circuit of a capacitor C and a resistor R. Further, a transistor T is connected in parallel with the series circuit of the electrical discharge machining section and the capacitor C.
そこで、この実施例の動作を第２図のタイミン
グ及び各波形を示す図と共に説明する。 Therefore, the operation of this embodiment will be explained with reference to FIG. 2 which shows the timing and each waveform.
直流電源Ｅが投入されると、直流電源Ｅ、抵抗
Ｒ、コンデンサＣ、電極Ｐ、ワークＷ、直流電源
Ｅの開閉回路により、電極ＰとワークＷ間のギヤ
ツプに第２図ハに示すようなギヤツプ電圧Ｖが印
加される。この場合、電極Ｐがプラス側に、ワー
クＷがマイナス側に電圧が印加される。その後、
電極ＰとワークＷ間の漏れ電流により、コンデン
サＣが充電され、第２図ロに示すように、電極Ｐ
側がマイナス、抵抗Ｒ、すなわちトランジスタＴ
接続側がプラスになつた充電電圧VCが発生する。
このような状態で、トランジスタＴのベースＧに
第２図イに示すようなパルスを印加してトランジ
スタＴをオンさせると、上記コンデンサＣの充電
電圧VCはトランジスタＴを介してワークＷと電
極Ｐ間に印加される。この場合、第２図ハに示す
ように、先とは逆にワークＷ側がプラスに、電極
Ｐ側がマイナスになつたギヤツプ電圧VGが印加
されることになる。その後、ワークＷと電極Ｐ間
に放電が発生し、コンデンサＣに蓄えられた電荷
はトランジスタＴを介して第２図ニに示すように
放電電流となつてワークＷと電極Ｐ間を流れ放
電加工を行う。そして、トランジスタＴがオフに
なると、再び電極ＰとワークＷ間には加工時とは
逆の逆電圧VGが第２図ハに示すように印加され、
以下、前述したと同様の動作を行い、この動作を
繰り返して放電加工が行われる。 When the DC power supply E is turned on, the opening and closing circuit of the DC power supply E, the resistor R, the capacitor C, the electrode P, the workpiece W, and the DC power supply E creates a gap between the electrode P and the workpiece W as shown in Figure 2 C. A gap voltage V is applied. In this case, a voltage is applied to the electrode P on the plus side and the workpiece W on the minus side. after that,
The capacitor C is charged by the leakage current between the electrode P and the workpiece W, and as shown in FIG.
negative side, resistor R, i.e. transistor T
A charging voltage V C is generated with the connection side becoming positive.
In this state, when a pulse as shown in FIG. 2A is applied to the base G of the transistor T to turn on the transistor T, the charging voltage V C of the capacitor C passes through the transistor T to the workpiece W and the electrode. It is applied between P. In this case, as shown in FIG. 2C, a gap voltage V G is applied that is positive on the workpiece W side and negative on the electrode P side, contrary to the previous case. After that, a discharge occurs between the workpiece W and the electrode P, and the charge stored in the capacitor C becomes a discharge current through the transistor T as shown in Fig. 2D and flows between the workpiece W and the electrode P during electrical discharge machining. I do. Then, when the transistor T is turned off, a reverse voltage V G , which is opposite to that during machining, is applied between the electrode P and the workpiece W again as shown in FIG.
Thereafter, the same operation as described above is performed, and this operation is repeated to perform electrical discharge machining.
発明の効果
以上述べたように、本発明は、簡単な回路によ
り、電極とワーク間の正負の電圧を印加でき、こ
れによつて、水等の電解性の加工液を用いた放電
加工においてもワークの電食を防止できる。Effects of the Invention As described above, the present invention can apply positive and negative voltages between an electrode and a workpiece using a simple circuit. Prevents electrolytic corrosion on the workpiece.
第１図は、本発明の一実施例を示す図、第２図
は、同実施例のタイミング及び各波形を示す図で
ある。
Ｅ……直流電源、Ｔ……スイツチング素子、Ｃ
……コンデンサ、Ｒ……抵抗、Ｐ……電極、Ｗ…
…ワーク。
FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing the timing and each waveform of the same embodiment. E...DC power supply, T...Switching element, C
... Capacitor, R ... Resistor, P ... Electrode, W ...
…work.
Claims (1)
工を行う放電加工の放電加工電源において、上記
電極とワークで構成され放電加工部に直列にコン
デンサを接続し、該放電加工部とコンデンサの直
列回路に抵抗を直列に接続した直流回路の両端に
直流電源を接続し、上記コンデンサと上記放電加
工部の直列回路と並列にスイツチング素子を接続
し、該スイツチング素子のオン・オフにより上記
電極とワーク間に正負の電圧を印加できるように
した放電加工電源。1. In an electrical discharge machining power supply for electrical discharge machining in which a voltage is applied between an electrode and a workpiece to cause discharge, a capacitor is connected in series to the electrical discharge machining section, which is composed of the electrode and the workpiece, and the electrical discharge machining section and the capacitor are connected in series. A DC power supply is connected to both ends of a DC circuit in which a resistor is connected in series to the circuit, and a switching element is connected in parallel to the series circuit of the capacitor and the electrical discharge machining section, and the switching element is turned on and off to connect the electrode and the workpiece. An electric discharge machining power supply that can apply positive and negative voltages between them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3599184A JPS60180725A (en) | 1984-02-29 | 1984-02-29 | Discharge machining power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3599184A JPS60180725A (en) | 1984-02-29 | 1984-02-29 | Discharge machining power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60180725A JPS60180725A (en) | 1985-09-14 |
| JPH0355253B2 true JPH0355253B2 (en) | 1991-08-22 |
Family
ID=12457303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3599184A Granted JPS60180725A (en) | 1984-02-29 | 1984-02-29 | Discharge machining power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60180725A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0724974B2 (en) * | 1985-05-15 | 1995-03-22 | 三菱電機株式会社 | Power supply for electric discharge machining |
| JP2006263907A (en) * | 2005-02-28 | 2006-10-05 | Tokyo Univ Of Agriculture & Technology | Electric discharge machine |
-
1984
- 1984-02-29 JP JP3599184A patent/JPS60180725A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60180725A (en) | 1985-09-14 |
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