SLM Ti6Al4V合金超精密微槽加工中的切削力与锯齿状切屑研究

Research on the Cutting Force and Serrated Chips in Ultra-Precision Micro-Grooving of SLM Ti6Al4V Alloy.

作者信息

Zheng Zhongpeng, Guo Jiajing, Gao Ruilin, Jin Xin

机构信息

Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.

Department of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China.

出版信息

Micromachines (Basel). 2023 Feb 24;14(3):533. doi: 10.3390/mi14030533.

DOI:10.3390/mi14030533

PMID:36984940

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10057032/

Abstract

Selective laser melting (SLM) has significant advantages in the near net shape manufacturing of metal parts with complex geometries. However, SLM parts usually have problems such as poor surface quality and low dimensional accuracy, which require post-processing. This paper focuses on the research around the influence of ultra-precision micro-grooving the SLM Ti6Al4V alloy on the cutting force and serrated chips. The influence of the processing parameters on the cutting force and surface processing quality was analyzed in detail, and the cutting simulation model of the SLM Ti6Al4V alloy was established. The formation process of the serrated chip was successfully simulated, and the experiments verified the reliability of the established model. The research results show that the dynamic cutting force and surface processing quality are mainly related to the depth of cut, and the two trends are consistent. It is also shown that the serrated chip begins on the free surface of the workpiece and propagates deeply in the shear zone, forming a shear band, and its serrated nodules move upward and forward to form periodic serrated chips.

摘要

选择性激光熔化（SLM）在制造具有复杂几何形状的金属零件的近净成形方面具有显著优势。然而，SLM零件通常存在表面质量差和尺寸精度低等问题，这需要进行后处理。本文重点研究超精密微槽加工SLM Ti6Al4V合金对切削力和锯齿形切屑的影响。详细分析了加工参数对切削力和表面加工质量的影响，并建立了SLM Ti6Al4V合金的切削仿真模型。成功模拟了锯齿形切屑的形成过程，实验验证了所建立模型的可靠性。研究结果表明，动态切削力和表面加工质量主要与切削深度有关，且二者趋势一致。研究还表明，锯齿形切屑始于工件的自由表面，并在剪切区内深入传播，形成剪切带，其锯齿形瘤向上向前移动，形成周期性的锯齿形切屑。