管坯冷定心孔电火花加工系统设计及工艺研究

System design and study on extraction process of EDMCD on tube billet

针对消除轧管过程中"铁耳子"的管坯冷定心孔加工问题,提出了一种基于碳弧气刨技术、弧压反馈控制技术和交流伺服技术的解决方法,即管坯冷定心孔电火花加工工艺,给出了EDMCD的具体工艺参数,并完成了系统设计。该方法利用铁碳电极间高温电弧快速钻孔,以实时弧压检测反馈的交流伺服控制策略实现具体加工工艺。研究结果表明,该加工工艺可以有效地提高不同材质管坯冷定心孔的加工效率和表面质量,较好地解决"铁耳子"问题。目前,该系统已成功应用于生产实际,并实现了钢坯后端冷定心孔的在线加工。

Aiming at solving the cold centering problem ＂leftover＂ of tube billet in tube rolling process,an extraction process called ＂electrical discharge machining central drilling（EDMCD）＂ was introduced,in which the technologies of carbon arc air gouging,the arc voltage feedback control and AC servo drive control was integrated,while the specific parameters of EDMCD on tube billet was analyzed and system design was accomplished based on the process mentioned above.High temperature arc between iron-carbon electrodes was used to bore central holes rapidly and AC servo control with real-time arc voltage detection feedback strategy was utilized to implement the EDMCD process.The results indicate that the method can significantly improve the drilling efficiency and surface quality of central holes of different materials and successfully help solve the ＂leftover＂ problem.Right now,the device has been widely applied in actual production and achieves online cold centering drilling on tube billet backend.