Hydraulic Indenter Apparatus for Precision Metal Testing
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Solution Overview
Problem
Existing indentation apparatus for detecting mechanical features of metal materials face challenges with high inertia, mechanical wear, structural complexity, and bulkiness due to mechanical force amplification, which affects precision and centering accuracy.
Innovation Solution
The apparatus employs a hydraulic force amplification system using bellows and position sensors arranged at 120° around the indenter to reduce fluid leakage and linear deformation, enabling precise measurements with reduced mechanical wear and size, and utilizes a rotating element with a translating mechanism for generating controlled force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical amplification is used to control indenter stroke, then measurement precision is improved, but device complexity and mechanical wear increase
Solution Approach 1:
The patent replaces the traditional mechanical amplification system with a hydraulic amplification system. The hydraulic system uses fluid pressure transmission to achieve force and motion amplification without complex mechanical linkages, thereby reducing mechanical wear and structural complexity while maintaining measurement precision through controlled fluid displacement.
Solution Approach 2:
The patent employs a hydraulic actuator with a piston and cylinder arrangement to amplify the indenter stroke. The hydraulic system transmits force through incompressible fluid, providing smooth and precise control of the indenter penetration depth without the inertia and wear associated with mechanical gear systems.
2Measurement precision
If mechanical amplification is used to control indenter stroke, then measurement precision is improved, but inertia increases
Solution Approach 1:
The patent substitutes the heavy mechanical amplification mechanism with a hydraulic system that has significantly lower moving mass. The hydraulic fluid transmits force without the inertia of gears, shafts, and linkages, enabling faster response times and reduced oscillations during indentation testing.
3Measurement precision
If high structural stiffness with guides is used to ensure centering precision, then centering accuracy is improved, but device complexity and encumbrance increase
Solution Approach 1:
The patent removes the complex guide structures from the indenter assembly by relying on the inherent stiffness of the hydraulic actuator and the rigid mounting structure. The indenter is directly coupled to the hydraulic piston, eliminating the need for separate guiding mechanisms while maintaining centering precision through proper alignment of the hydraulic system.
4Force
If traditional hydraulic actuators with sliding pistons are used, then force amplification is achieved, but fluid leakage occurs
Solution Approach 1:
The patent employs flexible bellows instead of rigid sliding pistons for hydraulic actuation. The bellows expand and contract to accommodate volume changes in the hydraulic fluid while maintaining sealed containment, thereby preventing leakage while still achieving the necessary force amplification through hydraulic pressure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a lightweight, compact, and precise apparatus for detecting mechanical features of metal materials, reducing mechanical wear and enhancing measurement accuracy by independent rotation correction and hydraulic force amplification.
Implementation Method 1
a second hydraulic actuator, in hydraulic connection with the first actuator, the second hydraulic actuator having a cross section larger than the first actuator and being operatively connected to the indenter to which it transmits the amplified force
Implementation Method 2
at least one among the first and the second hydraulic actuator is a bellows. This way, it is possible to reduce the loss of fluid of transmission that would leak if the hydraulic actuator were a piston slidingly mounted in a cylinder
Implementation Method 3
The arrangement of the position sensor near the indenter allows reducing possible linear deformation to which the apparatus is subject while detecting the data. According to the invention, the means for measuring the depth of penetration h of the indenter in the sample provides three position sensors that are not aligned and are arranged near the indenter same
Data Source
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AI summary
An apparatus (1) for detecting mechanical features of materials, in particular metal materials, comprising an indenter (10) adapted to be pushed against a sample material (15) in which it penetrates for a depth (h) and responsive to the hardness of the materials same. The apparatus (1) provides means for generating a measured force (F) and a transmission gear (35) which changes the rotational motion of shaft (40) of motor (30) into a linear reversible movement. The force generated is then amplified in a hydraulic way and transmitted to thr indenter (10) . This solution allows to lighten and to reduce the size of the mechanisms for generating the force, reducing also wear and mechanical backlash, as well as costs and overall dimensions. An advantage is also to measure with precision the stroke of the indenter with corresponding control in precision of the penetration (h) of the indenter in the sample material.