Investigation of Cutting Heat of Interface in Helical Milling of Titanium and Carbon Fiber Reinforced Plastic Stack
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摘要: 随着钛合金和复合材料（Carbon fiber reinforced plastic，CFRP）在航空航天制造业的应用比例逐渐增多，其叠层构件切削加工也成为研究热点。由于切削温度不仅影响刀具的磨损和耐用度，同时也会直接影响工件的加工精度和表面质量，本文在分析螺旋铣孔特点的基础上，对钛合金/CFRP叠层构件界面热传递机理进行了研究，建立了钛合金/CFRP叠层构件界面热传递模型，通过有限差分法对模型进行数值仿真求解；结合钛合金/CFRP螺旋铣孔实验，修正了刀具与工件的热传递系数以及工件界面温度传导率，通过钛合金/CFRP叠层构件螺旋铣孔切削热理论模型与试验结果对比，发现本文提出的理论模型分析结果和实验测量结果具有较高的一致性，能为钛合金/CFRP叠层螺旋铣孔加工工艺优化提供理论依据。Abstract: With the increasing proportion of titanium alloys and carbon fiber reinforced plastics (CFRP) in aerospace manufacturing, the cutting of laminated components has become a research hotspot. Since the cutting temperature not only affects the wear and durability of the tool, but also directly affects the machining accuracy of the workpieces and the quality of the machined surface. Based on the principle of helical milling, the mechanism of interface heat transfer in drilling titanium alloy/composite is studied. The interface model for titanium alloy/composite stacks is established. The model is calculated with computer simulation. The titanium alloy/composite experiment was carried out, and the heat transfer coefficient between the tool and the workpiece and interface heat transfer coefficient were corrected and verified via experimental data. By comparing the thermal theory and the experimental results in helical milling of titanium alloy/CFRP stacks, the analysis results and experimental data presented in this paper high consistency, which can provide a theoretical basis for studying helical milling cutting heat in titanium alloy/composite materials stacks.
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表 1 T300单向复合材料和Ti6Al4V的热物性参数
材料 导热系数/[W·(m·K)-1] 比热容/[J·(kg·K)-1] 密度/(g·cm-3) T300/4221 k1=4.5, k2=k3=1.5 465 1 500 Ti-6Al-4V k=6.7 678 4 450 
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表 2 螺旋铣孔切削条件
设备 参数 机床 Hanland XK714D NCPC 工件材料 CFRP (T300 5 mm厚)钛合金(Ti6Al4V 5 mm厚) 刀具 螺旋铣孔4齿专用刀具 温度测量 K型热电偶
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