Milling force measuring instrument based on thin film strain gauge

Abstract

The invention discloses a milling force measuring instrument based on a thin film strain gauge. The milling force measuring instrument comprises a cutter handle, an electromechanical device is fixed on the cutter handle, the electromechanical device comprises a battery, the thin film strain gauge, a signal processing circuit and a signal transmitting device, and the battery is electrically connected with the thin film strain gauge, the signal processing circuit and the signal transmitting device respectively. The battery is responsible for supplying energy, the thin film strain gauge is responsible for sensing a cutter handle surface strain signal generated by cutting force, the signal processing circuit is used for collecting and amplifying the signal measured by the thin film strain gauge, and the signal transmitting device is used for transmitting information processed by the signal processing circuit to a signal receiving device and uploading the information to an upper computer for data analysis.

Description

technical field [0001] The invention belongs to the technical field of cutting force measuring devices, and in particular relates to a milling force measuring instrument based on a thin film strain gauge. Background technique [0002] In the process of mechanical cutting, cutting force is an important parameter. By monitoring the magnitude and direction of cutting force, it can be used for the prediction and evaluation of tool wear and the quality of machined parts. At the same time, it can also guide the adjustment of processing parameters. Manufacturing is of great significance. [0003] The cutting force is generated at the cutting engagement point of the tool and the workpiece. According to Newton's third law, the cutting force can be measured at the workpiece end or the tool end. For milling, the cutting force of the workpiece end can be measured with a table-type dynamometer, but it cannot be widely used in production and processing due to its defects such as complica...

AI Technical Summary

Problems solved by technology

[0005] The common resistive strain sensors on the market are mainly pasted resistance strain gauges, which need to be closely attached to the surface of the tested object with the help of an adhesive for measurement, but the combination of the adhesive and the tested object will bring certain hysteresis and creep problems

If the adhesive strain gauge is used to measure the surface strain of the tool holder to measure the cutting force, it will be accompanied by the actual processing characteristics: (1) high-speed rotation and high-frequency vibration during tool processing; (2) high temperature; (3) The high rigidity of the shank leads to weak strain signals on the surface of the shank; the defects of the adhesive strain gauge will be more obvious, and it is difficult to measure the weak strain signals on the surface of the shank

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