KR20220091201A - Electrode non-rotating type attachment for electric discharge machining - Google Patents

Abstract

The present invention is to provide an electrode non-rotating type electrical discharge machining attachment for easy mounting and dismounting in a general-purpose machine tool. A mounting connection part 3 configured to be smoothly mounted on and detached from the spindle 101 of the general-purpose machine tool 100 on the upper part of (2), and a ball screw 42 and a ball screw installed in the elevating drive motor 41 (42) a lifting drive part 4 made of a lifting nut 43 for ascending and descending, and an electrode 50 installed at the lower end of the lifting mount 51 and the lifting mount 51 fixed to the lifting nut 43 The electric discharge machining part (5) and the connecting rod (61) and the connecting rod (61) installed to protrude outward by extending to the protruding housing (21), one end of which is fixed to the lower part of the elevating mount (51) and fixed to one side of the casing (2) It is characterized in that it includes a connecting support part 6 consisting of a lifting supporter 62 that is erected upwardly at the other end of the elevating mount 51 and has a fixed lower end installed therein, and according to this, it is possible to process the electric discharge machining object more precisely. Therefore, versatility and precision can be maximized, and since the discharge solution can be supplied and circulated with stable and smooth discharge processing, a number of effects can be expected, such as improving the convenience of use.

Description

Electrode non-rotating type attachment for electric discharge machining

The present invention relates to an electrode non-rotating type electric discharge machining attachment, which, if described in more detail, consists of an electric discharge machining machine that discharges without rotating the electrode as an attachment so that it can be easily mounted and detached on a general-purpose machine tool. It relates to an electrode non-rotating type attachment for electrical discharge machining.

In the present invention for the electric discharge machining, in general, electric discharge machining is to process a metal or a non-metal by using the action of heat or electric and mechanical force by electric discharge to erode the surface of the electrode, that is, two electrodes. It processes the workpiece using the physical, mechanical, and electrical action that is generated by generating an electric discharge between them. It is divided into metal processing and non-metal processing according to the type of work, and it is divided into hole digging, cutting, and grinding according to the type of work. discharging starts, and when the terminal voltage is lowered by discharging, discharging stops and charging starts at the same time. The intermittent method has been widely used, and the processing speed is high, the electrode consumption is small, and it is very effective for fine processing of parts.

And in the cutting process by electric discharge machining, when an electrolyte solution such as water glass is injected between the metal disk electrode connected to the + electrode side and the workpiece connected to the - electrode side through the brush and the disk is rotated, a discharge is generated and the workpiece is cut. It is mainly used for cutting high-strength transformer thin iron cores, magnetic steel, and super-hard alloys. Since there are defects such as generation, the method of electrolytic grinding was used.

As disclosed in Korean Patent Application Laid-Open No. 1983-0002575 (published on May 30, 1983) for the above-mentioned anti-corrosive machining, a wire cut electric discharge machine for electric discharge machining of a contour of a specific shape using a thin wire as an electrode cut electric spark machine) has been developed, and as disclosed in Korean Patent Application Laid-Open No. 1984-0000323 (published on February 18, 1984), electric There was a situation in which a dedicated electric discharge machine was developed and used so that various types of cutting, grinding, or drilling of a desired object were performed by electric discharge between the supplied electrode and the object to be processed.

In addition to this, in the conventional electric discharge machine, as disclosed in Korean Patent Application Laid-Open No. 2017-0119978 (published on October 30, 2017), an electric discharge machine for electric discharge machining is developed and distributed as a dedicated machine, and such an electric discharge machine In the case of general processing companies, in addition to general machine tools such as milling machines and machining centers, a separate electric discharge machine with large specifications is required, so the equipment purchase cost rises, takes up a lot of installation space, and it is difficult to carry. Of course, in recent years, small electric discharge machining machines have been developed that are made more compact in size and are made to be small and easy to move. It still had problems such as being unable to install and use it in general machine tools such as machining centers.

KR 10-1983-0002575 A 1983. 5. 30. KR 10-1984-0000323 A 1984. 2. 18. KR 10-2017-0119978 A 2017. 10. 30.

In the present invention, a new technology has been devised to solve the problems of the prior art, and the present invention is provided with a rotation transfer means so that the electrode can be finely angled left and right while the electrode is transferred up and down without being rotated. It was completed with the task to be solved in the invention in order to provide an electrode non-rotating type electric discharge machining attachment that can be flexibly adjusted to the shape of various processing objects and processed precisely.

In addition, the purpose is to further improve the efficiency of the discharge machining by supplying the discharge liquid from the outside to the center of the electrode.

In addition, although not separately described, other objects within the range that can be inferred in consideration of the specific contents, claims, drawings, etc. It is included in the overall solution of the invention.

As a specific means for solving the problems of the present invention, the present invention constitutes an electrode non-rotation type electric discharge machining attachment, and the electrode non-rotation type electric discharge machining attachment of the present invention is provided with a casing formed in a hollow cylindrical shape, and the casing is provided. At the upper part of the general-purpose machine tool spindle (= main shaft) is provided with a coupling fixedly installed coupling configured to be smoothly mounted and separated, and an elevating drive motor fixed to the inner upper side of the casing, and the elevating drive motor A lifting driving part consisting of a ball screw protruding downward from the , installed to rotate forward and reverse by the driving of a lifting drive motor, and a lifting nut screwed to the ball screw and configured to rise and fall on the ball screw by the forward and reverse rotation of the ball screw It is provided, and the lifting nut of the elevating driving part is fixedly installed at the upper end, so that when the elevating nut is used for elevating with a ball screw, the elevating installation unit is configured to protrude from the inside of the casing to the lower part of the casing, and it can be detached and replaced at the bottom of the elevator The electric discharge machining part is provided with an electrode configured to be fixedly installed so as to be close to the object to be processed so that the electric discharge machining is performed. A connection support consisting of a connecting rod installed to protrude outside the outer circumferential surface, and a lifting supporter whose lower end is fixedly installed so that the lower end is fixed to the inside of the protruding housing when the lifting installation is raised up and raised inside the protruding housing at the other end extending outward from the connecting rod It is characterized in that it is provided.

The present invention provides a supply hole to which a wire connector is coupled so that a discharge liquid is supplied from the outside to one side of the other end of the connecting rod, a transfer passage in communication with the supply hole in the connecting rod and formed through the elevating mount, and the lower inner side of the elevating mount. A discharge liquid supply unit configured to communicate with the transfer passage of the connecting rod to have an inlet chamber formed with a space for the discharge liquid to flow in, and an outlet formed in communication with the inlet chamber on a detachable electrode at the lower part of the lifting platform. have.

The present invention relates to a rotary frame installed to rotate freely around the casing at the outer lower end of the casing, a rotary transfer block fixedly installed on one side of the rotary frame so that the elevating supporter passes inside and is installed so as to stand upright, and the rear of the elevating supporter A pair of left and right configured so that the lower end of the rotary transfer block is fixed on the upper part of the rotary transfer block and installed to stand up inside the protruding housing It may be characterized in that the rotary transfer unit made of the fine adjustment knob of the further provided.

At this time, the rotary transfer unit has a circumferential surface concentric with the casing at the lower front end of the protruding housing fixed to the casing, and a rotary scale part in which the rotation angle is displayed as a scale, and a rotary transfer block fixed to the rotary frame rotated in the casing. Rotation detection means with a rotation indicator displayed to correspond to the scale of the rotation scale on the front upper part and indicated to indicate the rotation angle of the rotation transport block to which the rotation transport table is fixed by the fine adjustment knob inside the protruding housing is further provided can make it happen

In addition, in the electric discharge machining part, an insulator is interposed between the lifting mount and the lifting nut and installed to be insulated. A main bush configured to guide is further provided, and an insulator is interposed between the rotary transport block and an auxiliary bush configured to guide the sliding supporter when ascending and descending inside while fixing it with a fixing bolt to be insulated. Therefore, it may be characterized in that the casing is configured to insulate the current of the electrode.

According to the specific means for solving the above-mentioned problems, the electrode non-rotation type electrical discharge machining attachment of the present invention is implemented to be transferred up and down by configuring the electrode in a non-rotational manner rather than a method to rotate by driving a motor, and rotate the electrode It is to provide the effect of maximizing versatility and precision because the angle can be finely adjusted to the left and right by the conveying means, so that it can be flexibly adjusted according to the various shapes of the object to be processed by electric discharge, so that it can be processed more precisely.

At the same time, the discharge liquid is supplied from the outside of the holder where the electrode is fixed to the center of the electrode through the holder and the lower side of the anti-rotation rod, so that the discharge liquid is continuously supplied between the electrode and the object during electric discharge machining of the object to be processed by the electrode. Therefore, more stable and smooth electric discharge processing is made, and the discharge liquid can be automatically supplied and circulated, so that it can exhibit the effect of further enhancing the convenience of use, which is an invention with many expected effects.

1 is a three-dimensional view showing a preferred example of the present invention;
2 is a front view showing a preferred example of the present invention;
Figure 3 is a side cross-sectional view of Figure 1, an exemplary view of the electrode is raised
Figure 4 is a side cross-sectional view of Figure 1, an exemplary view of the electrode is lowered
5 is a partial cross-sectional view of the rotary transfer unit in the present invention
6 is an exemplary view of a state in which the electrode is rotated to the right by the fine adjustment knob in the rotary transfer unit of the present invention;
7 is an exemplary view of a state in which the electrode is rotated to the left by the fine adjustment knob in the rotary transfer unit of the present invention;

An object of the present invention is to provide an electrode non-rotation type electric discharge machining attachment in which an electric discharge machining machine of a type that is discharged without rotating the electrode is configured as an attachment so that it can be easily mounted and detached on a general-purpose machine tool. In order to be described in more detail with the accompanying drawings, the accompanying drawings are merely examples for easily explaining the content and scope of the technical idea of the present invention, and are not limited thereto, and the terms used are also used to describe the embodiments in detail. It should not be construed as being limited to the term.

As shown in FIGS. 1 and 2, the electrode 50 non-rotation type electrical discharge machining attachment 1 of the present invention has a mounting connection part 3 installed on the upper side of the casing 2 of a compact configuration, and the lower side The electric discharge processing part 5 provided with the electrode 50 which is lifted up and down by the lift driving part 4 is installed.

In the present invention, the casing 2 is configured in a compact size so as to be smoothly mounted and separated on the spindle 101 (= main shaft) of the general-purpose machine tool 100, and the coupling 31 is fixedly installed. (3) is installed on the upper part, and the electric connector 22 is installed on the front side of the protruding housing 21 fixedly installed to protrude from one outer circumferential surface of the casing 2 so as to supply external power to the inside of the casing 2 And, the protruding housing 21 has an empty interior and is fixed to one side of the casing 2 and has an open lower portion.

The casing 2 is formed in a hollow cylindrical shape as shown in FIGS. 1 and 3 , and an elevating driving unit 4 is provided inside, so that the electrode 50 of the electric discharge processing unit 5 at the bottom is shown in FIGS. 3 and FIG. As shown in Fig. 4, it is configured to be lifted up and down, and the lift drive unit 4 has a lift drive motor 41 mounted and fixed on the inner upper side of the casing 2, and the lift drive motor 41 protrudes downward from the lift port. The ball screw 42 installed to rotate forward and reverse by the driving of the motor 41 and the ball screw 42 are screwed together to ascend and ride the ball screw 42 by the forward and reverse rotation of the ball screw 42 and Consists of a lifting nut 43 configured to be lowered.

At this time, the electric discharge machining part 5, which is lifted by the lifting driving part 4 from the lower part of the casing 2, is installed so that the lifting nut 43 of the lifting driving part 4 is insulated with the insulator 200 interposed at the upper end. The nut 43 is configured to elevate in a state protruding from the inside of the casing (2) to the lower portion of the casing (2) when the nut (43) rides the ball screw (42).

When the elevating nut 43 rises by riding on the ball screw 42 of the elevating driving unit 4, the electric discharge machining unit 5 is formed with an upwardly opened inner space 511 so that the lower portion of the ball screw 42 is entered) An insulator 200 is interposed between the (cylindrical type) lifting mount 51 and the casing 2 and fixed with a fixing bolt 201 to be insulated, while the lifting mount 51 guides the sliding inward when ascending and descending. The electrode 50 is mounted on the lower part of the main bush 52 and the electrode holder 501 that is fixedly installed so that it can be detached and replaced at the lower end of the elevating mount 51 to bring it close to the object to be processed so that the electric discharge machining is performed. ) is made of

In the present invention, as shown in the three-dimensional view of Fig. 1 and the cross-sectional views of Figs. 3 and 4, it is fixed to the lower part of the elevating mounting base 51 of the electric discharge machining part 5 and extends to the protruding housing 21 and outward from the casing 2 It characterized in that the connecting support (6) configured to stand up to the inside of the protruding housing (21) is further included.

The connecting support part 6 has one end fixed to the lower part of the elevating mount 51 at the lower part of the main bush 52 and extends from one side of the casing 2 to the protruding housing 21 with the lower part open to extend the casing (2). The connecting rod 61 installed to protrude outward from the outer circumferential surface, and the other end extending outward from the connecting rod 61 rises upwardly into the protruding housing 21 so that the elevating mount 51 protrudes inside the protruding housing 21 when elevating It consists of a lifting supporter 62 with the lower end fixedly installed so as to ascend and descend together.

And when the connecting rod 61 and the elevating supporter 62 elevate while the elevating installation unit 51 is elevated by the elevating driving unit 4, the connecting support 6 is the elevating supporter 62 at the time of rising or lowering. An elevation detection sensor 63 configured to control the elevation of the elevation mount 51 by controlling the operation of the elevation driving motor 41 may be further provided.

The connection rod 61 of the connection support part 6 is provided with a discharge solution supply unit 7 configured to supply a dielectric discharge solution to the electrode 50 , and the discharge solution supply unit 7 is connected to the connection rod 61 . The supply hole 71 to which the wire connector 70 is coupled so that the discharge liquid is supplied from the outside to the other end of the one side, and the supply hole 71 inside the connecting rod 61 are in communication with the supply hole 71 and are formed through the elevating mount 51 The transfer passage 72 and the inlet chamber 73 communicated with the transfer passage 72 of the connecting rod 61 inside the lower inner side of the elevating mount 51 to form a space for the discharge liquid to flow in, and the elevating mount 51 It consists of a detachable electrode 50 at the bottom and an outlet 74 and a discharge passage 75 formed in communication with the inlet chamber 73 in the electrode holder 501 .

In the present invention, as shown in FIGS. 5 and 6 to 7, the electrode 50 is flexibly adjusted according to the various shapes of the object to be electric discharge processed with the electrode 50, and the angle is finely adjusted to the left and right. The rotation transfer unit 8 may be provided for precise processing.

The rotary transfer unit 8 is provided with a rotary frame 81 freely rotating around the casing 2 at the lower outer end of the casing 2, and a rotary transfer block 82 on one side of the rotary frame 81. This fixed installation is installed so that the lifting supporter 62 passes through the inner side of the rotary transfer block 82 and is connected to stand up, and at this time, the auxiliary bush 83 is installed inside the rotary transfer block 82 and the lifting supporter 62 ) is made to be guided by sliding when ascending and descending inward, and the insulator 200 is interposed between the auxiliary bush 83 and the rotation transfer block 82 to be insulated and fixed with a fixing bolt 201 .

In addition to this, the rotary transfer unit 8 has a lower end fixed to the upper portion of the rotary transfer block 82 at the rear of the lifting supporter 62, and a rotary transfer unit 84 that stands upward in the protruding housing 21 is installed, A pair of left and right fine adjustment knobs 85 facing both sides of the protruding housing 21 of the casing (2) are screwed and rotated from left to right inward. The electrode 50 fixed to the lower end of the lifting platform 51 is configured to adjust the angle according to the shape of the object while the elevation mount 51 connected to the connection support unit 6 by pressing left and right is angled left and right.

In addition, the rotary transfer unit 8 has a circumferential surface concentric with the casing 2 at the lower front end of the protruding housing 21 fixed to the casing 2, and a rotation scale portion 861 in which the rotation angle is displayed as a scale. And, on the upper front of the rotation transfer block 82 fixed to the rotation frame 81 rotated in the casing 2, the rotation scale part 861 is displayed to correspond to the scale of the protruding housing 21 inside the fine adjustment knob Rotation detection means 86 comprising a rotation indicating unit 862 displayed to indicate the rotation angle of the rotation transfer block 82 to which the rotation transfer table 84 is fixed by (85) can be further provided .

The electrode 50 non-rotation type electric discharge machining attachment 1 of the present invention configured as described above is a non-rotation type electric discharge machine that prevents the electrode 50 from rotating, not the method of rotating the electrode 50 in general electric discharge machining. is compactly configured in the form of an attachment (1), while raising and lowering the electrode 50 up and down by the elevating driving unit (4), and allowing the rotation angle to be finely adjusted by the rotary transfer unit (8), the The operation should be described in more detail.

First, external power is supplied to the electric connector 22 on the front side of the protruding housing 21 protruding from one side of the casing 2 and the elevating driving motor 41 inside the casing 2 through the inside of the protruding housing 21 ), when the ball screw 42 rotates in one direction in a forward rotation, the lifting nut 43 rises as shown in FIG. At this time, the electrode 50 mounted on the electrode holder 501 fixedly installed at the lower end of the elevating mount 51 rises into the casing 2, and drives the elevating drive motor 41 to drive the ball screw ( 42) is rotated in the opposite direction, as shown in FIG. 4, as the lifting nut 43 descends, the lifting mount 51 descends so that the electrode 50 gradually protrudes downward from the casing 2 It is possible to adjust the electrode 50 to be close to the electric discharge processing object.

And when the machining part of the object to be subjected to electric discharge machining by the electrode 50 does not match the direction of the electrode 50, as shown in FIG. 6, the fine adjustment knob 85 on the right side of the protruding housing 21 in the drawing The left side fine adjustment knob is rotated to protrude to the outside of the protruding housing 21 by rotating it, and the fine adjustment knob 85 on the left side of the opposite protruding housing 21 is rotated to enter the inside of the protruding housing 21 and retracted. By (85), the rotary feeder 84 is pushed to the right, and the rotary feed block 82 is simultaneously pushed to the right so that the rotary frame 81 rotating freely on the casing 2 is rotated, so that the front surface of the electrode 50 is To rotate to the right, or rotate the fine adjustment knob 85 on the left side of the protruding housing 21 in the drawing as shown in FIG. By rotating the fine adjustment knob 85 of By allowing the front surface of the electrode 50 to rotate to the left by being pushed and rotated to the rotating frame 81 that rotates freely on the casing 2, the electrode 50 is rotated left and right depending on whether the processing part of the tetragonal processing object is twisted. More precise processing is possible by making the By reading the corresponding scale from the rotation sensing means 86 made of the rotation indicating part 862 on the front of the rotation transfer block 82 rotated left and right by the It is possible to further increase the processing precision.

In addition, the insulator 200 is interposed between the elevating mount 51 and the elevating nut 43 to insulate it with the elevating nut 43 so that the current flowing to the electrode 50 in the casing 2 and the elevating drive motor 41 does not flow. The insulator 200 is interposed between the casing 2 and the main bush 52 to be insulated by the casing 2, and the insulator 200 is formed between the rotation transfer block 82 and the auxiliary bush 83. It is interposed and insulated with the rotary transfer block 82 to block the flow of current to the casing 2 and the lift drive motor 41 through the rotary frame 81, and electronic devices such as the lift drive motor 41 by current It has a function to prevent failure, etc.

As described above, in the detailed description of the present invention, the most preferred embodiment of the present invention has been described, but various modifications are possible within the scope that does not depart from the technical scope of the present invention. It is not limited to the example, but the scope of protection should be recognized from the techniques of the claims to be described later and equivalent technical means from these techniques.

1: (for electric discharge machining) attachment
2: casing 21: protruding housing 22: electric connector
3: Mounting connection part 31: Coupling
4: Elevating drive unit 41: Elevating drive motor 42: Ball screw 43: Elevating nut
5: Discharge machining part 50: Electrode 501: Electrode holder 51: Elevating mounting table 511: Inlet space 52: Main bush
6: Connection support unit 61: Connection rod 62: Elevation supporter 63: Elevation detection sensor
7: Discharge fluid supply unit 70: Wire connector 71: Supply hole 72: Transfer passage 73: Inlet chamber 74: Outlet 75: Discharge passage
8: rotary transfer unit 81: rotary frame 82: rotary transfer block 83: auxiliary bush 84: rotary feeder 85: fine adjustment knob 86: rotation detection means 861: rotation scale unit 862: rotation indication unit
100: universal machine tool 101: spindle
200: insulator 201: fixing bolt

Claims (5)

Casing (2) formed in a hollow cylindrical shape;
The coupling 31 is fixedly installed to the spindle 101 of the general-purpose machine tool 100 on the upper portion of the casing (2) and is configured to be smoothly mounted and detached;
The elevating drive motor 41 fixed to the inner upper side of the casing 2, and the ball screw 42 protruding downward from the elevating drive motor 41 and installed to rotate forward and reverse by the driving of the elevating drive motor 41, Elevating driving part 4 consisting of a lifting nut 43 coupled to be screwed to the ball screw 42 and ascending and descending on the ball screw 42 by forward and reverse rotation of the ball screw 42;
The elevating nut 43 of the elevating drive unit 4 is fixedly installed at the top so that the elevating nut 43 protrudes from the inside of the casing 2 to the lower part of the casing 2 when elevating the elevating nut 43 by riding the ball screw 42. An electric discharge machining part (5) consisting of the configured elevating mount (51) and the electrode (50) configured to be detachably installed at the lower end of the elevating mount (51) and fixedly installed so as to be close to the object to be processed so that electric discharge machining is performed;
A connecting rod 61 having one end fixed to the lower part of the elevating mount 51 and extending from one side of the casing 2 to the protruding housing 21 with the lower part open to protrude outward from the outer circumferential surface of the casing 2; At the other end extending outward from the connecting rod 61, it rises upwardly into the inside of the protruding housing 21, and the lower end of the elevating supporter 62 is fixedly installed so that the elevating mount 51 is raised and lowered together inside the protruding housing 21 when elevating. Connection support made of (6);
Electrode non-rotation type electrical discharge machining attachment, characterized in that it contains.
The method of claim 1 ;
The supply hole 71 to which the wire connector 70 is coupled so that the discharge liquid is supplied from the outside to one side of the other end of the connection rod 61, and the supply hole 71 inside the connection rod 61 to communicate with the elevating installation table 51 ), a transfer passage 72 formed through the direction, and an inlet chamber 73 that communicates with the transfer passage 72 of the connecting rod 61 inside the lower inner side of the elevating mount 51 to form a space for the discharge liquid to flow in; a discharge solution supply unit 7 configured to have an outlet 74 formed in communication with the inlet chamber 73 on the detachable electrode 50 at the lower portion of the elevating mount 51 ;
Electrode non-rotation type electrical discharge machining attachment, characterized in that it further comprises.
The method of claim 1 ;
The rotating frame 81 installed to rotate freely around the casing 2 at the outer lower end of the casing 2, and fixedly installed on one side of the rotating frame 81, the lifting supporter 62 passes through the inside to stand up The rotary transfer block 82 connected and installed, and the lower end is fixed to the upper portion of the rotary transfer block 82 at the rear of the elevating supporter 62 and the rotary transfer table 84 installed to stand up inside the protruding housing 21 and the casing (2) A rotation transfer unit composed of a pair of left and right fine adjustment knobs 85 that are screwed to opposite sides of the protruding housing 21 in (2) and press the rotary transfer table 84 left and right inside the protruding housing 21 (8) electrode non-rotation type electrical discharge machining attachment, characterized in that it further includes.
4. The method of claim 3;
The rotary transfer unit 8 is a rotary scale portion 861 in which the rotation angle is displayed as a scale while having a circumferential surface concentric with the casing 2 at the lower front end of the protruding housing 21 fixed to the casing 2 and, The fine adjustment knob 85 inside the protruding housing 21 is displayed to correspond to the scale of the rotation scale part 861 on the upper front of the rotation transfer block 82 fixed to the rotation frame 81 rotated in the casing (2). ), the rotational transfer block 82 to which the rotational transfer table 84 is fixed by the rotational transfer block 82, which is displayed to indicate the rotational angle of the rotational indicator 862, the electrode characterized in that it further includes a rotation detecting means (86) Attachment for non-rotating type electric discharge machining.
4. The method of claim 3;
An insulator 200 is interposed between the elevating mounting base 51 and the elevating nut 43 in the electric discharge machining unit 5 to be insulated;
The electric discharge machining part 5 has an insulator 200 interposed between it and the casing 2 and is fixed with a fixing bolt 201 to be insulated, while the main bush 52 configured to guide the lifting and lowering installation table 51 inside to slide when ascending and descending. is further included;
The rotary transfer unit 8 has an insulator 200 interposed between it and the rotary transfer block 82 and is fixed with a fixing bolt 201 to be insulated. (83) contains more;
Electrode no-rotation type electrical discharge machining attachment, characterized in that configured to insulate the current of the electrode (50) with the casing (2).

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