面向数控机床系统集成的多自由度喷嘴位姿调控方法

A multi-degree-of-freedom nozzle position and orientation control method for system integration of CNC machine tools

  • 摘要: 针对外喷式冷却润滑与时变刀位间的协同调控难题,设计了一种可与数控机床系统集成的多自由度喷嘴位姿调控机构,提出了一种根据刀具位置变化动态调整喷嘴位姿的方法,即通过解析NC(numerical control)程序获取刀具实时位置信息,结合PMC(programmable machine control)程序的编写,将数控机床Y信号输出至外部PLC(programmable logic controller),进而在切削过程中实现喷嘴对切削区的最佳喷射位姿调控,此种方法无需上位机控制、响应速度快且无需外置传感器。在此基础上,以GH4169高温合金典型结构件的微量润滑(minimum quantity lubrication,MQL)铣削为对象,对系统集成效果进行了测试,结果表明,单喷嘴工况下,固定入射角相比不固定入射角下的切削力最大可降低11.01%、表面粗糙度最大可降低9.35%;双喷嘴工况下,固定入射角相比不固定入射角下的切削力最大可降低6.91%、表面粗糙度最大可降低5.94%。验证了喷嘴位姿调控在保证冷却润滑介质精准输送、提升加工性能方面的有效性。

     

    Abstract: In order to address the challenge of coordinated regulation between external spray cooling lubrication and time-varying tool positions, a multi-degree-of-freedom nozzle position and orientation control mechanism integrat with CNC machine tool systems was designed. A method is proposed to dynamically adjust the nozzle position and orientation based on tool position variations. By parsing the NC program to obtain real-time tool position information and combining this with the programming of the PMC, the Y signal of the CNC machine tool is output to an external PLC, thereby achieving optimal nozzle position and orientation regulation for the cutting zone during the machining process. This method requires no host computer, has fast response speed, and eliminates the need for external sensors. On this basis, the effectiveness of the system integration is tested using minimum quantity lubrication (MQL) milling of typical structural components made of GH4169 superalloy. The results show that, under the single-nozzle condition, fixing the incidence angle reduced the cutting force by up to 11.01% and the surface roughness by up to 9.35%, compared with a non-fixed incidence angle. Under the dual-nozzle condition, fixing the incidence angle reduced the cutting force by up to 6.91% and the surface roughness by up to 5.94%. This verifies the effectiveness of the multi-degree-of-freedom nozzle pose control in ensuring precise delivery of cooling lubricants and enhancing machining performance.

     

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