Grease Consistency Testing via Compression Spreading
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Solution Overview
Problem
Current methods for determining the consistency of greases, such as those used in machine lubrication, are cumbersome, require specialized equipment, and lack reproducibility and accuracy, especially when conducted on-site or away from laboratories.
Innovation Solution
A method involving compressing a volume of grease between two surfaces to measure the extent of spreading, which correlates with the grease's consistency using a calibrated relationship based on compressive force, time, and temperature, allowing for the determination of NLGI grades or cone penetration depths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the standard ASTM D217 penetrometer test is used to measure grease consistency, then measurement precision is improved, but device complexity and ease of operation deteriorate due to specialized equipment requirements and inability to perform on-site testing
Solution Approach 1:
The invention creates a simplified copy of the penetrometer test principle using a standardized cone and scale that can be easily manufactured and deployed on-site, replicating the essential measurement function without the complex laboratory equipment
Solution Approach 2:
The invention replaces the complex mechanical penetrometer system with a simpler alternative based on grease spreading measurement under controlled compression, achieving comparable precision through a different mechanical approach
2Ease of operation
If subjective visual comparison methods are used for on-site grease testing, then ease of operation is improved, but measurement precision and reliability deteriorate due to lack of reproducibility between operators
Solution Approach 1:
The invention changes the measurement parameter from subjective visual comparison to objective grease spreading distance measurement under controlled compression force and time conditions, enabling both ease of operation and improved precision
Solution Approach 2:
The invention establishes predetermined compression forces and time periods before testing, creating standardized conditions that ensure reproducibility across different operators and locations
3Measurement precision
If the standard ASTM D217 test procedure is followed, then measurement precision is improved, but loss of time increases due to the five-second penetration measurement requirement and equipment setup
Solution Approach 1:
The invention replaces the time-sensitive penetrometer penetration measurement with a compression-based spreading measurement that can be performed and read immediately, reducing testing time while maintaining precision
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 approach provides a simple, accurate, and reproducible method for determining grease consistency on-site, offering immediate results and compatibility with various temperatures, thus enhancing maintenance efficiency and reducing equipment costs.
Implementation Method 1
compressing a volume of grease between two surfaces by applying a compressive force to the surfaces for a period of time, such that the grease is caused to spread between the surfaces
Data Source
AI summary
A kit for testing grease includes components for testing consistency, oil bleed characteristic and contamination. Consistency of the grease is tested by compressing a sample of the grease between two surfaces (e.g., glass plates), measuring the extent of spread, and comparing the measured spread to a calibrated reference. Oil bleed characteristic is tested by placing a quantity of the used grease on a test medium, heating the test sample, measuring a dimension of the grease quantity on the heated test sample, and determining the bleed characteristic of the used grease by comparing the dimension of the grease quantity to a reference. A contamination test may be performed by further compressing the consistency sample and inspecting the sample both by the naked eye and with a microscope.