Internal liquid-flushing cluster shaping electrode for electrospark machining

Abstract

An internal liquid-flushing type shaping cluster electrode for electrospark machining is composed of rod-shaped electrode units and an electrode base for holding a cluster of said electrode units. Said electrode base consists of electrode fixture interface, main body and holding module. Its advantages are easy manufacture, and high utilization rate of electrode material.

Description

technical field [0001] The invention relates to a cluster-forming electrode belonging to the technical field of special processing, in particular, a fluid-flushable cluster-forming electrode for electrical discharge machining. Background technique [0002] EDM is a processing method that uses thermal and chemical equivalent effects to etch away the workpiece material. It has the advantages of not being limited by the mechanical properties of the workpiece material such as strength and hardness, and has no macro cutting force. It is especially suitable for difficult-to-machine materials and parts with complex shapes. It is widely used in aviation, aerospace, automobile, electronics, mold, light industry and other industries. Workpieces with complex profiles are usually processed by forming electrodes. The electrodes used in the existing EDM processing methods have the following disadvantages: 1. Due to the complex shape of the electrodes and the change of contours with differ...

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Problems solved by technology

Workpieces with complex profiles are usually processed by forming electrodes. The electrodes used in the existing EDM processing methods have the following disadvantages: 1. Due to the complex shape of the electrodes and the change of contours with different workpieces, it is not conducive to batch processing. The process requires a lot of man-hours, the processing equipment is expensive, and there are high requirements for the processing level of the processing personnel; 2. During the electrode production process, a considerable part of the material needs to be removed, and the electrode must be replaced when it is worn to a certain extent, and the reuse rate is low. Waste Resources and energy do not conform to the trend of green manufacturing; 3. Multiple electrodes need to be made for replacement during forming processing. Due to the high cost of each electrode, the electrode cost accounts for about half of the entire processing cost; 4. Each forming electrode There can only be one power supply breakdown discharge at a time, plus the existence of discharge pulses, so that the material removal rate per unit time is not high; 5. When the area of ​​the forming electrode increases, the parasitic capacitance between the electrodes also increases, making each The energy of a pulse discharge is increased, which reduces the quality of the processed surface; 6. The working fluid of traditional EDM can only enter the processing area from the side gap of the electrode, and it is necessary to choose a suitable processing gap and parameters, and even often lift the electrode. Action to facilitate chip removal and reduce processing efficiency

Its disadvantages are: 1. The use of radioactive metal Co as the electrode has great radiation to the machine tool itself, the operator and the processed workpiece, not only does not meet the requirements of green manufacturing, but it needs to be used with caution

2. The electrode materials used need to use strategic resources such as tungsten and cobalt, and the cost is extremely high

3. The discharge gap used is 1 μm, which requires precise control and feeding system, and the cost of machine tools is very high

4. Only one discharge point, low processing efficiency

5. The cost of making shaped electrodes is extremely high, the time is long, and even nuclear reactors are required, which requires extremely high requirements for production personnel, which is seriously unfavorable for promotion in non-nuclear countries and regions

6. Suitable for micro processing, not suitable for forming electrode processing with large removal amount

7. Made by sintering method, the flexibility is poor, and the electrode obtained by sintering will be deformed

8. After the electrode part is worn out, it needs to be discarded to form radioactive waste

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