多轴正交高精度旋转框架的数控加工方法分析及应用

Numerical Control Machining Strategy of Multi-axis Orthogonal High Precision Rotating Frame

  • 摘要: 针对多轴正交高精度旋转框架难装夹、易变形、同轴度超差问题,分析了结构件的精度、加工难点,通过设计装夹方式和专用柔性组合工装,完成了球面及空间圆角的加工。通过开展五轴曲面加工方法及刀具轨迹分析,确定了曲面加工方法及工艺参数。基于UG软件完成曲面补片,以及内腔凹槽结构的T型刀设计。针对粗精加工阶段分别完成辅助毛坯模型的建立,优化调整切削参数、刀具选用和走刀路径,最终生成CAM数控程序后进行刀轨仿真,避免过程加工中刀具碰撞或干涉,利用五轴数控实现了曲面薄壁件的高效批量加工,保证了短柱长距零件的同轴度。加工过程中进行两次热处理,产品尺寸稳定性好。

     

    Abstract: There is a problem of difficult clamping, easy deformation, and out-of-control axiality for multi-axis orthogonal high-precision rotary frames, the accuracy and machining difficulties of structural parts were analyzed. The spherical and spatial rounded corners were completed by designing clamping methods and special flexible combination tooling. The machining method and technological parameters of 5-axis surface were determined by analyzing the machining method and tool path. Based on UG software, the surface patch and the cavity groove structure of T-cutter are designed. The auxiliary blank model was established in the roughing and finishing stage, the cutting parameters, tool selection and cutting path were optimized, and the tool track simulation was carried out after CAM numerical control program was generated to avoid tool collision or interference in the process of machining, and the efficient batch machining of curved thin-walled parts was realized by using five-axis numerical control, ensured the concentricity. Two heat treatments are carried out during the processing, and the dimensional stability of the product is good.

     

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