Extrusion Die Grease Consistency Measurement
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Solution Overview
Problem
Current methods for evaluating grease consistency, such as cone penetration tests and Thermal Gravimetric Analysis, require large samples and expensive equipment, limiting their adoption for routine analysis of grease-lubricated machines.
Innovation Solution
A method involving an extrusion die that measures the force needed to extrude a constant flow of grease through a discharge opening, using inexpensive equipment and a piston driven by an electric motor, which is adapted for use with a grease sampling device to provide a reliable and representative measurement of grease consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cone penetration test or TGA is used to measure grease consistency, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs a simple, inexpensive extrusion die that can be easily manufactured and replaced. The die consists of basic geometric features (inlet opening, flow restriction, discharge opening) that can be molded into a single piece or simple assembly, eliminating the need for complex TGA instrumentation while providing sufficient measurement capability for grease consistency evaluation.
Solution Approach 2:
The patent replaces complex thermal-gravimetric analysis instrumentation with a straightforward mechanical extrusion system. A piston applies controlled force to extrude grease through the die, and a load cell measures the force required. This mechanical approach substitutes for the complex thermal analysis equipment while achieving the measurement objective through a different physical mechanism.
2Measurement precision
If cone penetration test is used to evaluate grease, then measurement precision is improved, but quantity of substance required increases
Solution Approach 1:
The patent focuses the measurement on a localized flow path through the extrusion die rather than requiring a bulk sample characterization. The die's flow restriction creates a controlled local flow condition where the force measurement reflects grease consistency properties without needing to process or analyze a large volume of the substance.
Solution Approach 2:
The mechanical extrusion method requires only enough grease to fill the die cavity and flow through the restriction during the test. This is a small quantity compared to the large sample volumes needed for cone penetration tests, where the entire cone must be immersed in sufficient grease to allow proper penetration measurement.
3Reliability
If flow restriction is added to the extrusion die, then reliability of measurement is improved, but device complexity increases
Solution Approach 1:
The flow restriction creates a localized region of controlled flow conditions within the die. This local flow control ensures that the grease passes through a defined geometry with consistent parameters, making the force measurement more reliable and less sensitive to variations in grease composition or contamination, while the overall die structure remains relatively simple.
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 method allows for dependable evaluation of grease health without large sample volumes or expensive equipment, reducing data scatter and enabling routine analysis of grease-lubricated components.
Implementation Method 1
A load cell placed between the piston and the motor measures the force applied to the piston
Implementation Method 2
The piston is driven at a constant speed by an electric motor
Data Source
AI summary
A method of measuring a characteristic property of grease includes pushing a constant volumetric flow of grease through an extrusion die and measuring the force needed to extrude the grease from the die. The die includes a flow restriction that increases the force required to flow the grease.