Metal microstructure direct forming method based on electric spark discharging deposition additive manufacturing

Abstract

The invention discloses a metal microstructure direct forming method based on electric spark discharging deposition additive manufacturing. In the method, the layered manufacturing of a fast prototype technology and the advantages that the electric spark discharging deposition processing equipment is simple and the energy is easy to control are combined, a novel electric spark discharging deposition processing method facing the metal microstructure manufacturing is put forward, the processing way and the technological characteristic of the electric spark deposition processing are fully used, the inter-electrode discharging condition is controlled, the electrode high consumption of a tool and the deposited material corrosion removing are realized, the technical characteristics of the single discharging micro deposition and multiple discharging accumulation and forming are used, the deposition processing on a microstructure two-dimension layer is realized, and the two-dimension layer accumulation is used for forming a three-dimension micro component body. The metal microstructure electric spark discharging deposition processing technology is realized, the flexibility in the manufacturing process of the micro metal three-dimension component and the complexity of the processed component are improved, and the method provides a novel technical means for modern manufacturing.

Description

technical field [0001] The invention relates to the field of electric discharge technology, in particular to a method for direct forming of metal fine structures based on electric discharge deposition additive manufacturing. Background technique [0002] With the continuous deepening of EDM theory and experimental research, people have a deeper understanding of the phenomenon of electrode loss, the choice of processing media, and the discharge of erosion products during processing. Studies have shown that through micro-electrode spark discharge, not only the fine removal of metal materials can be realized, but also the deposition and growth of metal materials can be realized under appropriate process conditions by utilizing the high loss phenomenon of tool electrodes. The inevitable high electrode loss phenomenon in micro-EDM is beneficial to the growth and processing of tool electrode materials on workpieces. Research based on EDM has become a new microfabrication method a...

AI Technical Summary

Problems solved by technology

Micro-special processing methods mainly include micro-EDM, micro-electrolytic machining, micro-laser processing, ion beam processing, electron beam processing, etc. Among them, ion beam processing and electron beam processing can process a wide range of materials and are easy to achieve precise control. All need to be carried out in a vacuum, the processing equipment is expensive, and the flexibility of the processing technology is limited to a certain extent

Micro-laser processing has high precision, fast speed, and good processing performance. However, because its focus position has a great influence on the shape and depth of holes and feature sizes, it will form a processing taper and the processing depth is limited.

There is no tool electrode loss during micro-electrolytic machining, and it can be used for a long time. After machining, the workpiece does not produce residual stress, and the machined surface quality is good. However, micro-electrolytic machining has much smaller processing parameters than conventional electrolytic machining, and the machining gap is small. Discharge, causing changes in the concentration of the electrolyte in the processing area, prone to short circuit and instantaneous fusing of electrodes, destroying the processing process

And because there are many parameters that affect the stability of the gap electric field and flow field in electrolytic machining, precise control is difficult, and stray corrosion occurs during machining, so this method is currently difficult to achieve high machining accuracy and machining stability.

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