Online measuring system for high-speed cutting deformation field and method thereof

Abstract

The invention belongs to the field of metal machining, and discloses an online measuring system for a high-speed cutting deformation field and a method thereof. The online measuring system comprises adynamometer, an infrared camera, a dual-frame camera, a position sensor, a signal synchronous triggering module and a signal acquisition module, wherein the dynamometer is used for measuring the cutting force of a workpiece to be measured in real time; the infrared camera is used for measuring the temperature field of the workpiece to be measured in real time; the double-frame camera is used formeasuring the displacement field of the workpiece to be measured in real time; the position sensor is used for sending a measurement starting signal; after the signal synchronous triggering module receives the measurement starting signal, the signal synchronous triggering module controls the dynamometer, the infrared camera and the dual-frame camera to start measurement according to the preset time delay; and the signal acquisition module is used for acquiring results obtained by measurement, so that the online measurement of the cutting force, temperature field and displacement field of the workpiece to be measured in the high-speed cutting process is realized. Through the online measuring system and method thereof, the non-contact measurement of the transient deformation field and the temperature field under high speed and high strain is realized, the measurement process is safe and reliable, and the processing precision is guaranteed.

Description

technical field [0001] The invention belongs to the field of metal cutting, and more specifically relates to an online measurement system and method for high-speed cutting deformation field. Background technique [0002] The improvement of processing quality in cutting and the optimization of process parameters depend on the basic theoretical research on the cutting process. However, the cutting behavior is usually a large deformation at a very high strain rate in a very small area on the surface of the workpiece. This material The mechanical behavior is far from the traditional mechanical experiment situation. To explore the essence of the cutting process, under certain conditions, the workpiece material will produce a process from elastic deformation to plastic deformation (slip, twinning, grain boundary sliding, diffusive creep) to fracture (separation of chips and workpiece) under the action of external force. Therefore, the study of cutting deformation can be regarded ...

AI Technical Summary

Problems solved by technology

For the high-speed cutting process, some researchers use a high-speed camera to obtain the images before and after the surface deformation of the object, and then match the position of the same pixel in different images to obtain the displacement vector of the pixel, so as to obtain the displacement field of the surface of the specimen, but , the performance of the high-speed camera is limited, and it can only analyze the cutting speed of a few meters to a dozen meters; in addition, the temperature also has a great influence on the cutting deformation. At present, most of the high-speed cutting processes use simulation methods to monitor the temperature. However, such predictions are theoretical, and the actual cutting process is much more complicated than the theory, and the prediction accuracy is difficult to guarantee

Images