Due to the poor thermal properties of titanium alloys, heat generated and accumulated in the cutting area significantly affects tool life and workpiece quality. Although some methods have been proposed to measure the cutting temperature during machining titanium alloys, there still exist disadvantages including low spatial-temporal resolution, low measuring accuracy, restricted usage environment, etc. In this paper, a novel near-infrared two-color pyrometer system is developed and applied to measure the cutting zone temperature under dry and wet cutting of Ti‐6Al‐4V alloy. The developed pyrometer can eliminate the emissivity effect and shows a good linear relationship between the output signal ratio and the calibrated temperature. Meanwhile, the developed pyrometer exhibits good dynamic response and high measuring accuracy when measuring tool edge temperature and chip temperature in dry cutting conditions. In addition, a reliable sealing for cutter assembly is developed to overcome the influence of cutting fluid on the optic-fiber probe and the developed pyrometer can measure the tool edge temperature quickly and accurately in wet cutting conditions. In summary, the novel near-infrared two-color pyrometer system is validated to be quick responsiveness, high measuring accuracy, and good working stability when monitoring the cutting zone temperature under dry and wet cutting of Ti‐6Al‐4V alloy.

由于钛合金的热性能较差，在切削区域产生和积累的热量会显着影响刀具寿命和工件质量。虽然已经提出了一些测量钛合金加工过程中切削温度的方法，但仍存在时空分辨率低、测量精度低、使用环境受限等缺点。本文提出了一种新型近红外双色高温计。开发并应用了Ti-6Al-4V合金干湿切削切削区温度测量系统。开发的高温计可以消除发射率效应，并在输出信号比和校准温度之间显示出良好的线性关系。同时，开发的高温计在干切削条件下测量刀刃温度和切屑温度时表现出良好的动态响应和较高的测量精度。此外，为克服切削液对光纤探头的影响，开发了一种可靠的刀具组件密封件，开发的高温计可以在湿切削条件下快速准确地测量刀刃温度。综上所述，验证了新型近红外双色高温计系统在监测 Ti-6Al-4V 合金干湿切削下的切削区温度时响应速度快、测量精度高、工作稳定性好。为克服切削液对光纤探头的影响，开发了一种用于刀具组件的可靠密封，开发的高温计可以在湿切削条件下快速准确地测量刀具边缘温度。综上所述，验证了新型近红外双色高温计系统在监测 Ti-6Al-4V 合金干湿切削下的切削区温度时响应速度快、测量精度高、工作稳定性好。为克服切削液对光纤探头的影响，开发了一种用于刀具组件的可靠密封，开发的高温计可以在湿切削条件下快速准确地测量刀具边缘温度。综上所述，验证了新型近红外双色高温计系统在监测 Ti-6Al-4V 合金干湿切削下的切削区温度时响应速度快、测量精度高、工作稳定性好。