Study on Temperature Rise of Cutting Tool and Machining Error in Ultra-Precision Diamond Turning

Abstract

This paper describes the experimental analysis of temperature distribution of cutting tool during an ultra-precision diamond turning of aluminum and oxygen-free copper and the effect of cutting conditions on the temperature rise and the machining error due to the thermal expansion of cutting tool is discussed. The temperature distributions is measured by employing an infrared camera and the progress of the temperature rise at any points on the cutting tool is analyzed based on the images by using an image processing unit. The machining error, the relative displacement between the finished surface and the feed table, is measured by employing a capacitive-type proximeter. In this experimental conditions, the temperature rise at the sintered diamond tip reaches up to 15°C, while that at the single crystal diamond comes to approximately 5°C. The pattern of the temperature rise changes depending on the feed direction of the tool. The machining error is generated according to the progress of the temperature rise on the cutting tool and the magnitude becomes to an order of 1 μm.