Surface machined by high-speed wire electrical discharge machining (HS-WEDM) at super-high thickness (more than 1000 mm) cutting suffers from uneven surface, a major problem that has been investigated in this paper. According to the analysis, as wire frame span increases, the rigidity of the wire electrode decreases, and under the action of discharge explosive force, wire electrode vibration intensifies. As a result, the machining stability inevitably decreases. However, the core problem is whether there is enough working fluid in the slit to dampen and absorb the vibration of the wire electrode so as to ensure the positional stability of the wire electrode. To verify the above point of view: first, the wire guide and gravity take-up with bidirectional tension in the wire feeding system were installed to improve the positional accuracy of the wire electrode; second, to improve the flow of the working fluid into the slit, the slit width was increased by improving the working fluid and a medium carrier with a higher melting point and vaporization point can reduce the vaporization of the working fluid in the slit as much as possible. The experiment showed that the outlet flow of the improved working fluid is 56.72% higher than that of the original working fluid when cutting a 750-mm thick workpiece, which increases the damping and vibration absorption effect of the working fluid on the wire electrode in the long and narrow gap. After the above measures were implemented, super-high thickness cutting can be carried out continuously and steadily, the surface evenness was significantly improved, and the workpiece with a thickness of 2000 mm was cut successfully.

通过高速线材电火花加工 (HS-WEDM) 以超高厚度（超过 1000 毫米）切割加工的表面存在表面不平整，这是本文研究的主要问题。经分析，随着线架跨距的增加，电极丝的刚度降低，在放电爆炸力的作用下，电极丝振动加剧。结果，加工稳定性不可避免地降低。然而，核心问题是狭缝中是否有足够的工作液来阻尼和吸收线电极的振动，从而保证线电极的位置稳定性。验证上述观点：首先，送丝系统加装导丝器和重力收线器，具有双向张力，提高电极丝的定位精度；其次，为了改善工作流体进入狭缝的流动，通过改进工作流体来增加狭缝宽度，并且具有较高熔点和汽化点的介质载体可以减少狭缝中工作流体的汽化多达可能的。实验表明，在切割750mm厚的工件时，改进后的工作液的出口流量比原工作液的出口流量高56.72%，增加了工作液对电极丝的阻尼和吸振效果。狭长的鸿沟。上述措施实施后，可连续稳定地进行超高厚度切割，