ABSTRACT: The cutting machining experiments using PCD tool for hard and brittle materials was made in this paper, drawing out that the cutting force of hard and brittel matelials Can be divided into two parts the tendency part and random part by means of the DSP technology. In the time domain and frequency domain the cutting force signal was analyzed, pointing out that the component and structural characteristics of hard and brittle materials and the vibration of the cutting tool are the main. Factors causing the phefiomenon of negatiVe cutting force.

KEYWORDS: cutting force hard and brittle materials DSP