Measurement of tool temperature in burnishing using diamond tip

Abstract

This paper proposes a method for measuring the tool temperature during burnishing by using a diamond tip. The proposed method was used to examine the influence of tool wear behavior and burnishing conditions on the tool temperature. The experiment focused on the inner circumferential surface of a cylindrical geometric workpiece rotated by the main spindle of a lathe. The tool temperature was measured by using a two-color pyrometer with an optical fiber as a noncontact thermometer. An optical fiber was embedded in the workpiece in the radial direction, and it was rotated with the workpiece. The optical fiber accepted the infrared rays that radiated from the burnishing point of the diamond tip. Another optical fiber that was fixed on the outside of the lathe guided the accepted infrared rays to the two-color pyrometer. The accelerometer was fixed on the tool shank to detect the position of the burnishing point. The output pulses from the two-color pyrometer and accelerometer were stably observed during each rotation of the workpiece. The influence of the tool wear behavior on the tool temperature was observed. The tool temperature increased when the profile of the wear region of the diamond tip became rough. In contrast, the tool temperature decreased during the initial stage of burnishing. The circumferential speed of the target surface (burnishing speed) and the indentation force of the diamond tip on the target surface influenced the tool temperature.

Keywords

• surface finishing
• burnishing
• diamond tip
• tool temperature
• two-color pyrometer