摘要
在立铣刀螺旋槽的数控磨削过程中,砂轮的安装位姿对螺旋槽的前角、芯径、槽宽等截形参数影响显著,进而影响刀具的切削性能。精确、高效求解砂轮位姿是螺旋槽磨削工艺的首要任务,目前大多采用迭代的优化计算方法,但存在计算模型的精度与效率不足的问题。基于此对模型进行分析研究,采用一种优化计算新方法,根据芯径形成机理,通过接触原理对砂轮与工件的相对位姿进行运动变换,得到能够预先保证芯径的位姿参数表达式,降低了位姿参数变量维度,从而提高计算效率;同时推导了前角、槽宽的解析表达式,以此为约束,采用数值优化算法可精确计算出砂轮位姿参数。通过仿真与磨削试验对算法进行验证。结果表明,所提算法可以较精确地计算出砂轮位姿参数,相比于预先设计值误差较小,且计算效率比迭代法高,具有较高的工程实用性。
In the NC grinding process of the helical groove in end mills,the installation position of the grinding wheel has a significant influence on the cross-sectional parameters of the helical groove,such as rake angle,core radius,and groove width,which will directly affect the cutting performance of the tools.The accurate and efficient solution of the grinding wheel pose is the primary task of the helical groove grinding process.Currently,most of the grinding wheel position solution adopts the iterative optimization calculation method,which has the problem of insufficient accuracy and efficiency of the calculation model.Therefore,based on the analysis and research of the model,a new optimization calculation method is adopted.According to the formation mechanism of core radius,the relative pose of the grinding wheel and workpiece is transformed by the contact principle,and the pose parameter expression that can guarantee the core radius in advance is obtained,which reduces the variable dimension of pose parameter and improves the calculation efficiency.The analytical expressions of the rake angle and groove width are derived.The numerical optimization algorithm can accurately calculate the grinding wheel positional parameters.The algorithm is verified by simulation and grinding test,and the results show that the proposed algorithm can calculate the grinding wheel position parameters accurately,with small error compared with the pre-designed value,and the computational efficiency is higher compared with the iterative method,which has high engineering practicability.
作者
刘浩
李勇
阳智麾
江磊
Liu Hao;Li Yong;Yang Zhihui;Jiang Lei
出处
《工具技术》
北大核心
2024年第9期92-97,共6页
Tool Engineering
基金
四川省2023重点研发项目(2023YFG0035)。
关键词
磨削
圆柱螺旋槽
砂轮轮廓
砂轮位姿
grinding
cylindrical spiral groove
grinding wheel profile
grinding wheel posture
作者简介
第一作者:刘浩,硕士研究生,西南交通大学机械工程学院,610031成都市;通信作者:江磊,博士,副教授,西南交通大学机械工程学院,610031成都市。
