Electrode

Abstract

The utility model relates to the technical field of electric spark machining, and provides an electrode which comprises a base and an electrode block, the electrode block comprises a connecting portion detachably connected with the base and a working portion used for discharging, the working portion comprises an inner concave side face and a working plane making contact with a workpiece, and the electrode block and the base are arranged in a separated mode. The working part which is prone to loss can be replaced independently, the base can be used repeatedly, consumption of electrode materials is reduced, the side face perpendicular to the working plane is turned to be in an inward concave shape, the distance between the side face of the working part and the side wall of a workpiece cavity hole is increased, discharging of the side face of the working part is avoided, and the phenomenon of electric spark erosion is reduced. And the machining precision is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric spark processing technical field, specifically, an electrode. BACKGROUND

[0002] Electric spark processing, also known as electric processing, is a kind of non-contact processing technology using electric energy and heat energy. Unlike traditional cutting processing, electric spark processing does not involve direct contact between tool and workpiece, but relies on the continuous pulse spark discharge between tool and workpiece, and uses the high temperature generated instantaneously during discharge to gradually remove metal materials, thereby achieving the purpose of precision machining. It is widely used in aerospace, electronic information, mold manufacturing, optics and medical devices and other fields.

[0003] In traditional electric spark processing, the electrode is usually of rectangular structure, and its side surface is perpendicular to the processing surface. It is easy to cause voltage breakdown due to the too close distance between the electrode side surface and the inner side wall of the workpiece, resulting in electrode side surface discharge, and further causing the inner side wall of the workpiece to be removed, which affects the processing accuracy of the workpiece. In addition, the traditional electrode is usually integrally formed by wire cutting using a copper block, and the shape of its working end surface must be strictly matched with the target processing cavity of the workpiece. This means that a complete set of electrodes needs to be re-ordered for each batch of new models of workpieces, and the working surface of the electrode needs to be scrapped due to discharge loss, resulting in waste of resources. SUMMARY

[0004] The utility model aims at providing an electrode, which solves the problems of easy side surface discharge and material waste of the existing electrode.

[0005] The utility model realizes the following technical scheme: an electrode includes a base and an electrode block, the electrode block includes a connecting part detachably connected with the base and a working part for discharge, and the working part includes an inner concave side surface and a working plane in contact with a workpiece.

[0006] Further, the inner concave side surface is filled with an insulating layer, which fills the inner concave side surface into a plane perpendicular to the working plane.

[0007] Further, the cross section of the inner concave side surface is a circular arc surface or a trapezoidal surface.

[0008] Further, the connecting part is provided with a first through hole for communicating cooling water.

[0009] Further, the base is provided with a second through hole for communicating cooling water.

[0010] Further, the base is provided with a clamping groove, and the connecting part is fastened by bolts after being clamped and matched with the clamping groove.

[0011] Further, the connecting part is bolted to the base.

[0012] Further, the base is made of one of copper, titanium or tungsten.

[0013] Further, the electrode block is made of one of copper, titanium or tungsten.

[0014] The utility model has at least the following advantages and beneficial effects: the separation type setting of the electrode block and the base makes the work part which is easy to wear can be replaced alone, and the base can be repeatedly used, so that the consumption of electrode material is reduced, the side surface which is perpendicular to the work plane is turned into a concave shape, the distance between the side surface of the work part and the side wall of the workpiece cavity hole is increased, the side surface of the work part is prevented from discharging, the generation of electric spark etching phenomenon is reduced, and the machining precision is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 A structure diagram of the electrode is provided.

[0016] Fig. 2 A top view of the electrode is provided.

[0017] Fig. 3 A side view of the electrode is provided.

[0018] Reference signs: 1-base, 10-second through hole, 11-clamping groove, 2-electrode block, 21-connection part, 210-first through hole, 22-work part, 221-concave side surface, 222-work plane, 23-insulating layer. DETAILED DESCRIPTION

[0019] The specific embodiments are described below in conjunction with the accompanying drawings.

[0020] Example 1

[0021] As Figs. 1 to 3As shown, in the embodiment, an electrode is mainly disclosed, which mainly comprises a base 1 and an electrode block 2, the electrode block 2 comprises a connecting part 21 detachably connected with the base 1 and a working part 22 for discharging, the working part 22 comprises an inner concave side surface 221 and a working plane 222 in contact with a workpiece. Specifically, the electrode block 2 is separated from the base 1 in a detachable structure, so that the working part 22 which is easy to wear can be replaced alone, and the base 1 can be reused, thereby reducing the consumption of electrode materials compared with a traditional integrated electrode. The side surface perpendicular to the working plane 222 is turned into an inner concave shape, so as to increase the distance between the side surface of the working part 22 and the side wall of the forming cavity hole of the workpiece, avoid the side surface of the working part 22 from discharging, reduce the generation of electric spark erosion phenomenon, and improve the machining precision. In use, firstly, the electrode block 2 is connected with the base 1, one end of a pulse power source is connected with the connecting part 21, and the other end is connected with the workpiece, when the working plane 222 of the electrode block 2 approaches the workpiece, an electric field channel is formed between the working plane 222 and the workpiece, under the action of the electric field, the cathode electron moves towards the anode at a high speed, and the anode electron moves towards the cathode at a high speed, and the mutual collision generates ionization and discharges, instantaneously generates high temperature and high pressure, and the workpiece in the electric field channel is melted and vaporized, and the electrode block 2 is reciprocatingly fed, so as to copy the shape of the working plane 222 of the electrode block 2 on the workpiece. It should be noted that, in the electrochemical machining process, both poles of discharging need to be immersed in a liquid medium, mainly for the purpose of rapidly cooling the metal melted and vaporized by high temperature in the liquid, so as to achieve the purpose of protecting the workpiece.

[0022] Further, in specific implementation, the inner concave side surface 221 is filled with an insulating layer 23, and the insulating layer 23 fills the inner concave side surface 221 into a plane perpendicular to the working plane 222. Specifically, the insulating layer 23 can be made of ceramic material, and constitutes a discharge prevention barrier, further blocks the discharge of the side surface of the working part 22, and cooperates with the inner concave side surface 221 to eliminate the risk of side surface discharge. Meanwhile, the insulating layer 23 forms a vertical plane after filling, which can avoid the machining contour deviation caused by electric field distortion to a certain extent. It should be noted that the insulating layer 23 is stably attached to the inner concave side surface 221, so as to ensure that peeling does not occur under the conditions of machining vibration and high temperature.

[0023] Further, in specific implementation, the inner concave side surface 221 is a circular arc surface or a trapezoidal surface. On the one hand, the heat stress in the discharging process of the electrode block 2 can be dispersed; on the other hand, the debris can be discharged during deep cavity machining, and the probability of secondary discharge is reduced.

[0024] Further, in specific implementation, the first through hole 210 for communicating cooling water is arranged in the connecting part 21, and the cooling water directly flows through the connecting part 21 of the electrode block 2, so that the heat source is quickly discharged, the heat accumulation of the electrode block 2 is avoided, and the loss of the electrode block 2 is reduced. In addition, while ensuring the strength of the electrode block 2, the weight of the electrode block 2 can be reduced, the inertial impact during high-speed machining is reduced, and the device is suitable for precision micro-EDM machining.

[0025] Further, in specific implementation, the second through hole 10 for communicating cooling water is arranged in the base 1, and the heat conducted to the base 1 by the electrode block 2 is taken away by the cooling water, and at the same time, the electrode block 2 is cooled, so that thermal fatigue is avoided, and the service life of the device is improved.

[0026] Further, in specific implementation, the connecting part 21 is bolted to the base 1. When the electrode block 2 is installed with the base 1, the connecting part 21 is overlapped on the base 1, the bolt holes arranged in the connecting part 21 and the base 1 are aligned, and then the bolt is used for connection, so that the electrode block 2 is quickly connected and disassembled with the base 1.

[0027] Further, in specific implementation, the base 1 is made of one of copper, titanium and tungsten, and the electrode block 2 is made of one of copper, titanium and tungsten, so as to ensure the mechanical strength and electrical conductivity of the electrode block 2 and the base 1.

[0028] Embodiment two

[0029] In this embodiment, the main structure is completely consistent with that of embodiment one, and the difference is that the base 1 is provided with a clamping groove 11, and the connecting part 21 is clamped and matched with the clamping groove 11 and then fastened by a bolt. Specifically, the electrode block 2 in embodiment one is horizontally connected, while the electrode block 2 in this embodiment is vertically connected. When the electrode block 2 is installed with the base 1, the connecting part 21 is first matched and inserted into the clamping groove 11, and then the bolt on the side of the base 1 is used for fastening and clamping connection. Through the clamping pre-tightening and the bolt fastening, the connection loosening during machining is avoided, and the connection stability and reliability are improved. At the same time, the multi-pose assembly of the base 1 and the electrode block 2 is realized, and the applicability and flexibility of the device are improved.

Claims

1. An electrode characterized by, The electrode block (2) comprises a connecting part (21) detachably connected with the base (1) and a working part (22) for discharging, and the working part (22) comprises a concave side surface (221) and a working plane (222) in contact with a workpiece.

2. An electrode according to claim 1, wherein The concave side surface (221) is filled with an insulating layer (23) to fill the concave side surface (221) into a plane perpendicular to the working plane (222).

3. An electrode according to claim 1, wherein The concave side surface (221) is in a circular arc surface or a trapezoidal surface in cross section.

4. An electrode according to claim 1, wherein The connecting part (21) is provided with a first through hole (210) for communicating cooling water.

5. An electrode according to claim 1, wherein The base (1) is provided with a second through hole (10) for communicating cooling water.

6. An electrode according to claim 1, wherein The base (1) is provided with a clamping groove (11), and the connecting part (21) is clamped and matched with the clamping groove (11) and then fastened by bolts.

7. An electrode according to claim 1, wherein The connecting part (21) is bolted to the base (1).

8. An electrode according to claim 1, wherein The base (1) is made of one of copper, titanium or tungsten.

9. An electrode according to claim 1, wherein The electrode block (2) is made of one of copper, titanium or tungsten.

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