On-line prediction method of subsurface damage depth during rotary ultrasonic machining of hard and brittle materials for vehicles

Abstract

The invention discloses an online prediction method for the subsurface stratum damage depth during the rotary ultrasonic machining of hard and brittle materials for a vehicle. The online prediction method for the subsurface stratum damage depth during the rotary ultrasonic machining of hard and brittle materials for the vehicle comprises the steps of (1) determining the effective cutting time anda maximum cutting force; (2) determining the number of abrasive particles on the edge of the end surface of a cutter and the number of abrasive particles with a certain height participating in cutting; (3) determining the total impulse of the abrasive particles with the selected height and the total impulse of the cutter; (4) building a theoretical relational model of the cutter cutting force andthe equivalent indentation depth; and calculating according to the cutter cutting force obtained through measurement so as to obtain the equivalent indentation depth; and (5) building a theoretical relation between the maximum expansion depth of subsurface stratum cracks and the equivalent indentation depth of the cutter. The online prediction method for the subsurface stratum damage depth duringthe rotary ultrasonic machining of hard and brittle materials for the vehicle provided by the invention can be used for accurately online predicting the subsurface stratum damage depth during the rotary ultrasonic machining of hard and brittle materials for the vehicle.

Description

technical field [0001] The invention relates to the technical field of rotary ultrasonic machining, in particular to an online prediction method for subsurface damage depth in rotary ultrasonic machining of hard and brittle materials for vehicles. Background technique [0002] Ceramic materials have excellent mechanical, thermal and electrical properties, making them widely used in automotive engines (cylinder liners, piston crowns, valve guides, intake and exhaust valve seats, bearings, tappets, cams, cam followers and Piston rings, etc.), heat exchange parts (ceramic heaters, ceramic rotors, converters, heat exchangers, heating element joints and turbine chargers and turbine impellers on gas turbines, etc.), ignition systems (spark plug substrates) and various sensors Manufacture of (temperature, gas, humidity, pressure, vibration and speed sensors, etc.). However, ceramic materials have the characteristics of high hardness and low fracture toughness, which makes their ma...

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Problems solved by technology

[0007] Aiming at the problem that the prediction method of the subsurface damage depth in the existing field of vehicle hard and brittle materials in the rotary ultrasonic machining process fails to consider the difference in the height of the abrasive grains and does not count the number of effective abrasive grains, resulting in low prediction accuracy, the present invention provides An online prediction method of subsurface damage depth in rotary ultrasonic machining of hard and brittle materials for vehicles is proposed, which realizes accurate online prediction of subsurface damage depth in the process of rotary ultrasonic machining of hard and brittle materials for vehicles

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