3D Hardness Mapping With Constant-Depth Cutting and Indentation
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Solution Overview
Problem
Existing hardness measurement methods face inaccuracies due to varying indentation depths and surface unevenness, which hinder accurate comparison of hardness values across different locations.
Innovation Solution
A method involving controlled cutting and indentation depths to ensure a constant indentation depth at multiple points, combined with imaging and re-imaging to enhance measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the surface is mirror-polished to achieve a smooth surface, then the surface finish is improved, but the hard parts are polished shallowly and soft parts deeply causing surface unevenness
Solution Approach 1:
The patent applies preliminary action by performing cutting at a predetermined depth before hardness measurement. This pre-cutting creates a controlled surface layer that eliminates the unevenness caused by mirror-polishing, ensuring that subsequent indentation measurements are taken at consistent depths regardless of the underlying surface hardness variations.
Solution Approach 2:
The patent changes the surface processing parameter from mirror-polishing to controlled cutting at a specific depth. This parameter change transforms the surface state from one that exhibits hardness-dependent polishing depth variations to a uniform cut surface that provides consistent measurement conditions for hardness testing.
2Measurement precision
If the indentation depth is controlled to be constant, then the measurement comparability is improved, but the actual indentation depth varies due to surface unevenness
Solution Approach 1:
The patent performs preliminary cutting at a controlled depth to create a uniform surface platform. This pre-action ensures that when the indenter is applied at constant depths, the actual indentation depth remains consistent because the surface unevenness has been eliminated by the controlled cutting process.
Solution Approach 2:
The controlled cut surface acts as an intermediary layer between the indenter and the underlying material. This intermediary surface provides a reference plane that ensures consistent indentation depths, mediating the relationship between the constant control parameter and the actual measurement to eliminate surface unevenness effects.
3Manufacturing precision
If the surface is cut evenly at a controlled depth, then the surface evenness is improved, but the measurement process becomes more complex
Solution Approach 1:
The patent merges the cutting process and hardness measurement process into an integrated workflow. The controlled cutting is performed at predetermined depths, and the hardness measurement is immediately conducted on the same prepared surface, combining two separate operations into a unified measurement sequence that reduces overall process complexity.
Solution Approach 2:
The patent establishes controlled cutting depth as a key parameter that simplifies the measurement process. By fixing the cutting depth at predetermined values, the system transforms a complex surface preparation and measurement sequence into a standardized protocol where the controlled parameter (cutting depth) automatically ensures surface evenness without requiring additional adjustment steps.
Data Source
AI summary
To provide a three-dimensional hardness distribution measurement method with better measurement accuracy. The method is a three-dimensional hardness distribution measurement method including and repeating: cutting evenly a surface of a member to be measured; imaging the surface having been cut; and pushing an indenter for a hardness test into a plurality of points on the surface having been imaged. In the method, a cutting depth of the surface is controlled, in the cutting, to a predetermined constant amount, and indentation depths of the indenter at the plurality of points are controlled, in the pushing, to a predetermined constant amount.