电加工与模具

高压壳体作为液体火箭发动机涡轮泵系统的核心零件，由多个狭长流道组成。针对高压壳体流道电火花加工效率低、表面易烧蚀等问题，通过改进电极结构，设计双流道复合电极，增加放电面积及放电能量，提高加工效率；采用分段式加工策略及高效摄动加工技术，提升加工过程的稳定性；通过工艺试验确定高压壳体电火花加工时的放电参数，并加工高压壳体试验件。结果表明，采用该工艺粗加工时接通电极的稳定放电电流由24 A提升至52 A，加工效率提升约30.07%，电极成本降低40%，对具有狭长流道产品的电火花加工具有重要的指导意义。

The high-pressure shell,as the core component of the turbopump system in liquid rocket engines,consists of multiple narrow channels. This study conducts research on the problems of low EDM efficiency and easy surface ablation of the flow channels in the high-pressure shell. By improving the electrode structure,designing a dual-flow-channel composite electrode,increasing the discharge area and discharge energy,the machining efficiency of the product is improved. The segmented machining strategy and the high-efficiency perturbation machining technology are adopted to enhance the stability of the machining process. The discharge parameters during the EDM of the highpressure casing are determined through process tests,and test pieces of the high-pressure shell are machined. By using this process,the stable discharge current of the rough machining connection electrode is increased from 24 A to 52 A,the machining efficiency is increased by about 30.07%,and the electrode cost is reduced by 40%. The process methods in this study have important guiding significance for the electrical discharge machining of products with narrow and long flow channels.