Measuring System and Method for Measuring Hardness

Simple SummaryContent extracted from patent full text and abstract with AI.

The invention describes a measuring system and method for primary and instrumented hardness measurement of an object. The system uses a combination of a precision stand, a movable carriage with a penetrator (indenter), force and motion actuators, and separate force and displacement measurement circuits. A key feature is the application of the Kibble balance (Watt balance) principle for direct, traceable force measurement using the Lorentz force, enabling highly accurate and direct SI-traceable hardness measurements without the need for calibrated weights or reference plates. The system also employs a separate metrology frame and advanced displacement measurement, such as laser interferometry, to provide precise and independent path measurement, isolating it from force-induced deformations.

Use CasesContent extracted from patent full text and abstract with AI.

• Calibration laboratories and national metrology institutes for direct SI-traceable hardness calibration.
• Quality control in material testing and research labs for metals, ceramics, and other materials requiring high-precision hardness measurements.
• Manufacturing industries where accurate material property validations are critical (e.g., aerospace, automotive, medical devices).
• Educational and research environments to study the mechanical properties of materials and refine hardness testing methodology.
• Automated testing systems that require reliable and accurate hardness values for consistent quality assurance.

BenefitsContent extracted from patent full text and abstract with AI.

• Provides direct and highly accurate hardness measurements traceable to physical constants and SI base units, increasing confidence and reducing uncertainty.
• Removes the need for reference hardness plates and external mass standards, simplifying calibration and maintenance.
• Separates force and displacement measurement paths for higher measurement accuracy and minimized errors due to mechanical deformations.
• Can automatically adjust for various specimen thicknesses and orientations, improving versatility and automation potential.
• Offers improved thermal stability and reduced sensitivity to environmental factors via design and material selection.
• Allows for fully automated operation, reducing operator influence and human error.

Technical Classifications (CPCs)

Inventors & Applicants

Patent Abstract

A measuring system comprises a stand having a base plate and a vertical column fastened thereto, a stand carriage that is movable along the vertical column and having a counter bearing for placing the object, a runner that is fastened to the stand carriage and is movable relative thereto in a guided manner and has an indenter for penetrating the object, having at least one force generation actuator, at least one motion generation actuator, wherein the indenter is coupled to the stand carriage via the actuators. The measuring system further comprises a metrology frame which is fastened to the counter bearing and is supported laterally on the vertical column, a displacement measuring unit for measuring a displacement of the stand carriage and/or the runner with the indenter. The measuring system comprises a force measuring circuit and a displacement measuring circuit both being are largely configured separately from one another.