Device and method for measuring numerical control turning machining dynamic cutting force

Abstract

The invention discloses a device and a method for measuring numerical control turning machining dynamic cutting force. The device comprises a cutter bar, a fixed cutter seat, a blade, an anti-skid pad, a data processing module, a force sensor, a shock excitation rod, a limiting spring, a spring base and a data bus, wherein the data processing module, the force sensor, the shock excitation rod, thelimiting spring and the spring base are arranged inside the cutter bar, the force sensor comprises a force sensitive element, a conversion element and a PCB circuit board, and a filter, an amplifierand a power supply module are integrated on the PCB circuit board. The shock excitation rod and the blade arranged inside the cutter bar are connected together through a linkage pin hole and a linkagebolt, in the cutting process, force borne by the blade is transmitted to the shock excitation rod in real time, the shock excitation rod can acquire the real stress condition of the blade in the cutting process in real time, the force sensor is embedded in the interior of the cutter bar in an integrated mode and is positioned around the shock excitation rod, so that the influence of external force on the force sensor can be effectively avoided, and meanwhile, data measuring is accurately carried out on the shock excitation rod.

Description

technical field [0001] The invention belongs to the field of dynamic cutting force testing, in particular to a device and method for measuring dynamic cutting force in numerically controlled turning. Background technique [0002] Cutting force is an important basis for rational design and use of machine tools, cutting tools and fixtures. The dynamic cutting force in the process of CNC turning directly affects tool wear, durability, cutting heat, surface quality of machined parts and cutting vibration, and even affects the cutting stability of the CNC turning process system. In the actual machining process, in order to optimize the machining process parameters, monitor tool wear and tear and machine tool vibration online, it is necessary to measure the dynamic cutting force in real time. The empirical calculation formula of cutting force is: [0003] [0004] In formula 1), F c Main cutting force; C Fc is the coefficient; a P is the back cutting amount; f is the feed ...

AI Technical Summary

Problems solved by technology

The installation and debugging technology of the device is relatively complicated, and it is easily affected by other factors of the machine tool

[0010] The document with the application number 201811211237.9 discloses an integrated turning force measurement tool system embedded with a film sensor. Although it can solve the problem of low measurement accuracy of the turning force measurement technology, it is easy to Errors in measurement data due to external force

[0011] In summary, the existing cutting force measurement devices for turning machining have the following problems: for different types and structural forms of CNC lathe cutting force measurement devices, a variety of connection mechanisms need to be added, the installation is complicated, debugging is difficult, and the versatility is poor; and during the measurement process , requires corresponding charge amplifiers and acquisition devices to obtain signals, and the peripheral wires directly affect the on-line measurement of dynamic cutting force. The measurement accuracy is low and the cost is high. Therefore, it is necessary to develop a dynamic cutting force measurement device for CNC turning embedded in the tool holder. To meet the online real-time measurement requirements for turning processing under actual cutting conditions

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