OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 7 5 A measuring cutter (Fig. 6, b) was used for the experimental study of AE properties. AE was evaluated using a piezoelectric transducer (2) installed in contact with a tetrahedral plate (1) made of hardmetal (79 % WC; 15 % TiC) and the body of the cutter (5). Two ceramic plates, based on solid solutions of zirconate and lead titanate (ZLT), are installed so that their outer surfaces are in electrical contact with the tool body, while the central plates are insulated and connected to a coaxial cable (3), the braid of which is connected to the cutter body. The ceramic inserts (2) are pressed against the cutting plate with a screw (4). The coaxial cable is connected to a computer for information processing via an analog-to-digital converter E14-440. A model of the source of power emission can be proposed. To do this, on the surface of the wearable flank face of the tool, we select the area of Si (N,k)(t) (Fig. 6, c) in which the force f i (N,k)(t) is formed. In time, it represents a sequence of standard pulses (Fig. 6, d), each of which describes the change in forces over a time interval t∈(ti−1,ti). a b c c Fig. 6. Scheme of AE signal measurement and formation: a – model of periodic force components formation; b – cutter measuring scheme; c, d – model of random pulse sequence formation
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