JPH0466649B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel electric discharge machining apparatus, and particularly to a type of electric discharge machining apparatus in which the surface of a full-form electrode is covered with a metal tape.

[Conventional technology]

In electrical discharge machining equipment, it is impossible for the electrodes to wear out in any way. Therefore, when performing electric discharge machining using multiple expensive full-type electrodes, the cost of the electrodes reaches a huge amount, so it has been proposed to use a replaceable metal thin film or metal tape to cover the consumable parts. There is.

That is, an electrode guide having a molded surface disposed opposite to the workpiece, and an electrode (hereinafter referred to as a thin film, tape or wire) on the molding surface of the electrode guide facing the workpiece. , referred to as a tape electrode), the tape electrode is brought into close contact with the molded surface of the electrode guide, and electrical discharge machining is performed, and the used and consumed tape electrode is sequentially collected. A device has been developed that makes it possible to perform machining with virtually no wear and deformation of the machining electrode.

However, in the conventional device, when the tape electrode is consumed, it is peeled off from the molded surface of the electrode guide, and sequentially collected into a take-up roller or collection box, and the molded surface of the electrode guide is replaced with a new one. The process was carried out by covering it with a tape electrode.

However, under certain processing conditions or when processing takes a long time, the consumption of the tape electrode becomes extremely large, resulting in not only a waste of valuable resources, but also a cost that cannot be ignored. Then, a problem arose.

[Problems to be solved by the present invention]

The present invention has been made based on the above-mentioned viewpoints, and its purpose is to manufacture a tape electrode that covers the molded surface of the electrode guide every time it is processed, and to remove the worn out tape electrode from the electrode guide. The present invention provides an electric discharge machining apparatus that sequentially peels off and collects tape electrodes from the forming surface of the tape electrode, regenerates the recovered tape electrodes to create new tape electrodes, and then covers the forming surface of the electrode guide with this tape electrode again for machining. That is.

[Means for solving problems]

The above object is to provide an electrode guide having a molded surface disposed opposite to the workpiece, and to perform electric discharge machining of metal or the like on the molding surface of the electrode guide facing the workpiece. A tape or wire-shaped electrode (hereinafter simply referred to as a tape electrode) made of an electrode material is supplied, and the tape electrode is brought into close contact with the molded surface of the electrode guide, and the electrode guide and the workpiece are A pulse discharge is generated within the machining gap while supplying machining liquid to the machining gap formed between the two, and while maintaining the machining gap appropriately, the electrode guide body covered with the tape electrode and the covered material are In electrical discharge machining equipment that processes workpieces by performing relative machining feed between workpieces, it is equipped with a plating anode, a plating liquid is stored, and a used tape electrode is used as the plating anode as needed. A plating tank equipped with a means for recovering wood, and a plating tank rotatably provided in the plating tank, the outer peripheral surface of which is mirror-finished,
A tape electrode forming roller used as a cathode surface for electrodepositing an electrode, a plating power supply device such as a direct current that supplies a predetermined plating current between the plating anode and the tape electrode forming roller, and the tape electrode forming roller. A motor that rotates at a predetermined speed,
A device for peeling off the tape electrode formed on the outer peripheral surface of the tape electrode forming roller and supplying it to the electrode guide, and a plating tank for collecting the used tape electrode from the electrode guide and plating it as necessary. This can be accomplished by attaching a tape electrode manufacturing device consisting of a device for transporting the tape to the electrode.

[Effect]

As mentioned above, by attaching a tape electrode manufacturing device to an electrical discharge machining device that processes tape electrodes by bringing them into close contact with the molded surface of an electrode guide, it is possible to recycle used tape electrodes and manufacture new tape electrodes. death,
Since this tape electrode is used for processing, valuable resources can be saved and processing costs can be significantly reduced.

〔Example〕

Hereinafter, the details of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of the electrical discharge machining apparatus according to the present invention, and FIG. 2 is an explanatory diagram showing another embodiment.

In FIG. 1, 1 is a processing tank, 2 is a stage provided in the above-mentioned processing tank 1, 3 is a workpiece, 4 is an electrode guide having a forming surface substantially similar to the shape to be processed, and 5 is a An electrode shank, 6 has a built-in drive mechanism such as a servo motor 7, and is attached to a column of the electrical discharge machining apparatus main body (not shown) or an arm extending from the column; 8 is a tape electrode; 9;
10 is a brake roller; 11, 12 are tape electrode straightening rollers that straighten the tape electrode 8; 13, 14 are tape electrode crushing rollers that crush the tape electrode 8 peeled off from the electrode guide 4; 15, 16; are pinch rollers, 17 and 18 are capstans, 19, 20, 21, 22, 23 and 24 are guide rollers, 25 and 26 are cutters, 27
28 and 29 are cross slide tables that move the machining tank 1 in the X-axis direction and the Y-axis direction, respectively; and 30.
31, 32 and 33 are the respective cross slide tables 28, 29 and the tar table 3;
0, and 34 is a tape electrode manufacturing device.

The tape electrode manufacturing apparatus 34 includes a plating tank 35 whose inner wall surface is covered with a plating anode 36 made of graphite, stainless steel, etc., and is rotatably accommodated in the plating tank 35, and the width of the plating tank 35 is A tape whose outer peripheral surface is made of a conductive material with a mirror finish and is used as a cathode surface for electrodeposition, and whose other parts are covered with a non-conductive material. Electrode forming roller 37
and a plating power supply device 38 such as a direct current or pulse power source that supplies a voltage of a predetermined polarity between the outer peripheral surface of the plating anode 36 and the tape electrode forming roller 37, and the tape electrode forming roller 37 is rotated at a predetermined speed. and a scraper 40 for peeling off the tape electrode 8 formed on the outer peripheral surface of the tape electrode forming roller 37 from the outer peripheral surface.

In this embodiment, the plating tank 35 is filled with the plating liquid 39, and the plating anode 3
6 is made of the same material as the tape electrode 8 or graphite, etc., and the tape electrode forming roller 37
A voltage of a predetermined polarity is supplied from the plating power supply 38 between the outer circumferential surfaces of the tape electrode forming roller 37, which is rotated at a constant speed by a motor (not shown). Processing is performed.

Further, as will be explained later, cut and used tape electrodes 8 are collected and deposited on the bottom surface of the plating tank 35.

The plating current flows from the plating anode 36 to the outer circumferential surface of the tape electrode forming roller 37 via the chips of the tape electrode 8 and the plating liquid 39, and the tape electrode 8 is electrically applied to the outer circumferential surface of the tape electrode forming roller 37. The outer circumferential surface of the tape electrode forming roller 37 is polished to a mirror finish, or if necessary, for example, JP-A-59-
Like the electroforming mold described in Japanese Patent No. 056592, a thin anodic oxide film is formed for easy peelability, and a scraper 40 provided close to the outer circumferential surface of the tape electrode forming roller 37 is formed. As a result of this action, the tape electrode 8 formed on the outer peripheral surface of the tape electrode forming roller 37 is separated from the outer peripheral surface, taken up by the pinch roller 15 and the capstan 17, and then transferred to the brake rollers 9, 1.
0, and then the tape electrode correction roller 1
1 and 12, the workpiece 3 of the electrode guide 4 is brought into close contact with the opposing molding surfaces.

Note that if the tape electrode forming roller 37 is rotated slowly, a thick tape electrode 8 will be electrodeposited on the outer peripheral surface of the tape electrode forming roller 37, and if the tape electrode forming roller 37 is rotated quickly, a thin tape electrode 8 will be electrodeposited. .

The tape electrode 8, which serves as a processing electrode and is in close contact with the molding surface portion of the electrode guide 4 facing the workpiece 3, is supported so as to slide in sliding contact with the tip of the electrode shank 5. At the same time, the head 6 is moved vertically by a servo motor 7 built into the head 6, and is configured to face the workpiece 3 with a predetermined gap maintained therebetween. The electrode guide 4 is made of conductive metal or alloy,
Preferably, it may be made of an alloy with high wear resistance, but it may also be made of ceramics or an alloy or resin coated with ceramics.

A predetermined electric discharge machining voltage pulse is supplied between the tape electrode 8 and the workpiece 3 from the power supply device 27,
Electric discharge machining progresses due to the discharge erosion caused by this.

The workpiece 3 is mounted on a stage 2 in the processing tank 1, and the workpiece 3 is moved in the X-axis and Y-axis directions by cross slide tables 28 and 29, and is moved by a turntable. Rotary motion is provided by 30.

As the tape electrode 8 wears out as processing progresses, the pinch rollers 15, 16 and capstans 17, 18 rotate continuously or intermittently, and the worn tape electrode 8 is removed from the electrode guide 4. It is removed and replaced with a new tape electrode 8.
Further, the worn tape electrode 8 is removed from the molding surface of the electrode guide 4 and then crushed by the tape electrode crushing rollers 13 and 14, and the pinch roller 1
6 and capstan 18, and through guide rollers 19, 20, 21, 22, 23 and 24,
It is cut into pieces by cutters 25 and 26 and collected in a plating tank 35 as required.

A servo motor 7 that moves the electrode guide body 4 attached to the electrode shank 6 up and down, motors 31 and 32 that drive the cross slide tables 28 and 29, a motor 33 that drives the turntable 30, and the tape electrode 8 and workpiece 3
A power supply device 27 that supplies voltage pulses between them, a motor (not shown) that rotates the capstans 17 and 18 that send out and collect the tape electrode 8;
Furthermore, a motor (not shown) that rotates the tape electrode forming roller 37, a DC power supply 38 that supplies a predetermined voltage between the plating anode 36 and the outer peripheral surface of the tape electrode forming roller 37, etc. are operated according to a predetermined program. Therefore, they are configured to be collectively controlled by a control device (not shown).

Next, FIG. 2 will be explained.

In Figure 2, the same numbers as those in Figure 1 indicate the same components;
1 and 42 are guide rollers; 43 is a tape for cutting the tape electrode 8 manufactured by the tape electrode manufacturing device 34 into a desired shape, such as a wire shape or narrowing the width of the tape electrode, or drawing the tape electrode 8; This is an electrode shaping device.

In this embodiment, a tape electrode shaping device 43 is provided, and as the machining conditions change as the machining progresses, the wire-shaped electrode or the narrow electrode can be shaped into the electrode guide body 4. When it becomes necessary to process the tape electrode 8 in close contact with the molding surface, the tape electrode 8 can be shaped into a wire-shaped electrode or an electrode with a desired width by operating the tape electrode shaping device 43.

〔Effect of the invention〕

Since the present invention is configured as described above, when using the electric discharge machining apparatus according to the present invention, a tape electrode that covers the molded surface of the electrode guide is manufactured each time machining is performed, and the worn tape electrode is removed from the electrode guide. The tape electrode can be sequentially peeled off and collected from the molded surface, and the collected tape electrode can be recycled as necessary to create a new tape electrode, and this tape electrode can be used again to cover the surface on which the electrode guide is formed and processed. As a result, resources can be saved and processing costs can be significantly reduced.

Note that the present invention is not limited to the embodiments described above. That is, for example, in this embodiment, the inner wall surface of the plating tank was covered with graphite or the like to serve as the plating anode, but the same result could be obtained even if the plating tank was made of synthetic resin or the like and the plating anode was provided inside. It is effective. In addition, a reservoir portion for the tape electrode 8 manufactured by the tape electrode manufacturing device 34 may be provided at an appropriate position such as between the capstan 17, the pinch roller 15, and the brake rollers 9 and 10, or a storage portion for the tape electrode 8 manufactured by the tape electrode manufacturing device 34 may be provided. The plating liquid is collected one after another, and a predetermined amount of new plating liquid is supplied into the electrode recovery tank from a plating liquid supply tank (not shown) by a pump, and the plating liquid is supplied while being heated. It is also recommended that
In addition, the method of supplying voltage between the plating anode and the outer peripheral surface of the tape electrode forming roller, the method of bringing the tape electrode into close contact with the forming surface of the electrode guide, etc. can be freely changed within the scope of the purpose of the present invention. The present invention encompasses all of them.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the electrical discharge machining apparatus according to the present invention, and FIG. 2 is an explanatory diagram showing another embodiment. 1... Processing tank, 2... Stage, 3... Workpiece,
4... Guide body, 5... Voltage shank, 6... Head, 7
... Servo motor, 8... Tape electrode, 9, 10... Brake roller, 11, 12... Tape electrode correction roller, 13, 14... Tape electrode crushing roller, 15,
16... Pinch roller, 17, 18... Capstan, 19, 20, 21, 22, 23, 24, 4
1, 42...Guide roller, 25, 26...Cut,
31, 32, 33...Motor, 28, 29...Cross slide table, 30...Turntable, 34
...Tape electrode manufacturing device, 35...Plating tank, 36...
Electrode for plating, 37...Tape electrode forming roller, 3
8... DC power supply device, 40... Scraper, 43... Tape electrode shaping device.

Claims (1)

[Scope of Claims] 1. An electrode guide having a molded surface disposed opposite to the workpiece, and an electric discharge machining electrode made of metal or the like on the molding surface of the electrode guide facing the workpiece. supplying a tape or wire-shaped electrode (hereinafter simply referred to as tape electrode) made of material, and bringing the tape electrode into close contact with the molded surface of the electrode guide,
The electrode guide and the workpiece are moved relative to each other to supply machining liquid to the machining gap formed between them, while generating a pulse discharge within the machining gap, and while maintaining the machining gap appropriately, the tape electrode In an electrical discharge machining device that processes a workpiece by performing relative machining feed between an electrode guide coated with an electrode guide body and a workpiece, a tape electrode manufacturing device comprising the components described in items a) to f) below is installed. An electric discharge machining device characterized by the following. a) A plating tank equipped with a plating anode and containing a plating solution. b) Rotatably provided in the electrode collection tank,
A tape electrode forming roller whose outer peripheral surface has a mirror finish and is used as a cathode surface for electrodepositing electrodes. c) A DC power supply device that supplies a constant plating current between the plating anode and the tape electrode forming roller. d) A motor that rotates the tape electrode forming roller at a predetermined speed. e) A device for peeling off the tape electrode formed on the outer peripheral surface of the tape electrode forming roller from the outer peripheral surface and supplying it to the electrode guide. f) A device for collecting and transporting used tape electrodes from the electrode guide.