| 任斐,孙玉文,郭东明.复杂曲面加工过程多约束自适应进给率控制策略[J].,2011,(6):819-824 |
| 复杂曲面加工过程多约束自适应进给率控制策略 |
| Multi-constrained adaptive feedrate schedule strategy for complex curved surface machining |
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| DOI：10.7511/dllgxb201106008 |
| 中文关键词: 进给率控制策略 刀具运动分析 切削力建模 |
| 英文关键词: feedrate schedule strategy tool motion analysis cutting force modeling |
| 基金项目:“九七三”国家重点基础研究发展计划资助项目(2011CB706800)；国家自然科学基金资助项目(51075054). |
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| 中文摘要: |
| 建立了基于过程约束和刀具运动分析的切削力精确预测模型,在此基础上提出了复杂曲面加工过程多约束的进给率自适应定制方法．基于刀具与工件的相对运动分析,并依据刀刃微元在切削过程中真实运动轨迹的解析表达,建立了精确计算未变形切屑厚度的理论模型,由此给出针对复杂曲面加工的任意刀具运动轨迹拓扑形状的铣削力计算公式．以切削力模型为基础,结合悬臂梁模型、应力模型和扭矩计算公式,给出进给率定制过程中的关键制约因素．以材料去除率最大化为目标,通过求解有约束极值问题实现进给率优化．实例验证表明该模型能够进行复杂曲面加工进给率自适应定制,优化后的进给率有利于在保证加工精度和安全的前提下实现加工效率的最大化． |
| 英文摘要: |
| A multi-constrained adaptive feedrate schedule strategy is proposed for complex curved surface machining based on process constraints and a tool motion analysis of precise cutting force prediction model. With mathematically describing the true trace of cutting element during machining, and based on the relative motion analyses of tool and workpiece, a new undeformed chip thickness model is derived and the cutting forces are predicted for complex curved surface machining with various toolpath topologies. In terms of the cantilever beam model, tool stress model and cutting torque model, key process constraints are calculated with the proposed cutting force model. With defining the material removal rate as objective function, the feedrate is scheduled by solving a constrained optimization problem. The machining experiments illustrate that the proposed feedrate schedule strategy is very useful in precision and efficiency for machining the complex curved surface. |
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