Preparation Method and Experimental Study of Array Microholes on the Surface of Nickel-Based Single Crystal Superalloy

doi:10.12068/j.issn.1005-3026.2023.12.007

Abstract

Abstract: Micro hole structure has a wide range of applications in aerospace， modern medical， precision instruments and other fields， but the aperture size is small and the machining accuracy is high， and the cutting force of conventionally contact machining methods makes the hole accuracy difficult to control. However， the characteristics of non-contact and no macroscopic cutting force of EDM make it have unique advantages in the fabrication of micro holes. The experimental study on the preparation of array micro holes on the surface of nickel-based single crystal superalloy was carried out， firstly， the rhomboid array microelectrode with the average edge of less than 340μm was prepared by low speed wire electrical discharge machining (WEDM-LS) combined with finish trim cut. The forming accuracy， surface morphology and element change of the array microelectrode were further analyzed. The array microelectrode was used to process the array micro holes on the surface of nickel-based single crystal superalloy. The uniformity accuracy of the array micro holes， surface quality of the hole wall and electrode loss characteristic were investigated. The effect of cutter lifting speed and cutter lifting mode on the wall roughness of the array micro holes was revealed， which prepared array micro holes with high efficiency and high precision on nickel-based single crystal superalloy.

Key words: array micro holes; WEDM-LS; nickel base single crystal superalloy; surface roughness; electrode wear

CLC Number:

TG661

SUN Yao， TANG Ben-jia， GONG Ya-dong， LI Si-hui. Preparation Method and Experimental Study of Array Microholes on the Surface of Nickel-Based Single Crystal Superalloy[J]. Journal of Northeastern University(Natural Science), 2023, 44(12): 1719-1725.

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