Thin film strain gauge bridge circuit based on flexible circuit board on high-rigidity force measuring knife handle

Abstract

The invention discloses a flexible circuit board-based thin film strain gauge bridge circuit on a high-rigidity force measuring knife handle, which adopts a multi-stage resistor parallel registration structure and comprises two thin film strain resistors R1 and R2 and four registration resistors R3, R4, R5 and R6, the registration resistors R4, R5 and R6 are connected in parallel, then are connected in series with the registration resistor R3, and then are connected in parallel with the film strain resistors R1 and R2 which are connected in series; the connection points of the two ends of the film strain resistors R1 and R2 which are connected in series and the flexible circuit board are film strain resistor welding points, and the two ends of the registration resistors which are connected in series are welded to the welding points of the film strain resistors respectively. According to the invention, an adjusting mode of multi-stage resistor parallel connection is adopted, and two more registration resistors are connected in parallel on the basis of an original circuit; the resistors with any resistance can be combined theoretically; and a proximity registration principle is provided, and the registration resistor is welded near the thin film strain resistor, so that the length of a lead between the registration resistor and the thin film strain resistor is reduced, the additional resistance is reduced, and the circuit stability is improved.

Description

technical field [0001] The invention relates to a thin-film strain gauge bridge circuit based on a flexible circuit board on a high-rigidity force-measuring tool handle. Background technique [0002] Milling force is an important physical parameter reflecting the milling process. The measurement of dynamic milling force in milling process is the most direct and critical information to monitor the running state of the machine tool and troubleshoot the machine tool. Through the real-time measurement of the milling force, the tool parameters can be optimized, the milling conditions can be improved, the tool status can be reflected, and the machined surface roughness can be predicted to avoid irreversible damage to the workpiece. Usually, the milling force is measured at the tool end, and the milling force is indirectly measured by sensing the mechanical deformation of the tool holder. The sensing element is generally a resistance strain gauge. The tool holder for measuring mi...

AI Technical Summary

Problems solved by technology

Since the high-precision resistors on the market are generally standard resistors, the resistance value is not arbitrary. If two resistors R 3 with R 4 For registration, it is difficult to control the ratio of the resistance values ​​of the two registration resistors to be equal to the ratio of the resistance values ​​of the thin film strain resistance; and there are errors in the resistance, the higher the precision of the resistance, the higher the cost, and the fewer resistance values ​​​​to choose from

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