【摘要】 <正> 在实现四个现代化的进程中,对精密微小加工的要求日益增加,本文就采用电火花加工表面人工缺陷方面作一些初步探索。在断裂力学研究中,常常需要在试样上或构件（如压力容器）上人为的制出表面裂缝（即人工缺陷）进行测试,材料为37SiMnCrMoV 超高强度钢,淬火硬度Rc=60～62。研究的初步目标是在容器上制出如图1所示的表面裂纹,以进行断裂韧度k_1c 值的测更多还原

【Abstract】 To manufacture the small and precise parts is more and more required dayby day in our inductry.In this article a comprehensive introduction of theprimary reseach of methods of making the surface crack with spark erosion.The principal content of the research work is to make the narrow surfacecrack in the test piece or in the structural paot.This surface crack is used todetermine the coefficient of fracture toughness Kic of metallic material.Theresearch work shows us that we may use the method of spark erosion to makethe surface crack.Now we can make the surface crack with the older sparkerosion machine,this surface crack has 1～2 mm.in depth and 0.06 mm.width in root,and in this field we have solved a series of practical problems.The research work also shows us,that to manufacture the small and preciseparts with spark erosion has its own characteristic problems,such as:the choiceof the pole’s material,the pulse power supply,the automatic feed system andpurge of the erosion’s remains.If we further improve the problem justmentioned,we will manufacture even more precise and smaller parts inhigh quality.更多还原