Pumpable Grease Composition for Machine Tool Lubrication
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Solution Overview
Problem
Conventional greases exhibit poor flowability and are difficult to pump, leading to inadequate lubrication and increased consumption of lubricating oils, which results in environmental issues and the stick-slip phenomenon in machine tools, affecting processing precision.
Innovation Solution
A lubricating grease composition with a worked penetration of 400 to 500 and a base oil having a kinematic viscosity of 10 to 200 mm²/s, combined with insoluble solid particles such as organic molybdenum, PTFE, and melamine cyanurate, allowing for effective pumping and reduced stick-slip phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If grease is used for lubrication, then consumption cost is reduced and scattering is minimized, but pumpability deteriorates and flowability is poor
Solution Approach 1:
The patent changes the consistency parameter of grease by controlling worked penetration to 300-500 and base oil kinematic viscosity to 10-200 mm²/s at 40°C, transforming conventional thick grease into a pumpable semi-liquid state that maintains grease benefits while enabling automatic lubricator operation
Solution Approach 2:
The patent creates a composite lubricating composition by combining base oil with specific viscosity range, grease thickener, and insoluble solid particles, achieving a material that exhibits both grease-like lubrication properties and oil-like flowability for pumpability
2Loss of substance
If grease is used for lubrication, then consumption is reduced, but stick-slip phenomenon increases due to poor flowability
Solution Approach 1:
The patent adjusts the consistency parameters (worked penetration 300-500, base oil viscosity 10-200 mm²/s) to optimize the balance between maintaining grease benefits and ensuring sufficient flowability to prevent stick-slip phenomenon during machine tool operation
Solution Approach 2:
The patent introduces insoluble solid particles as intermediary elements that enhance lubrication film formation and reduce stick-slip tendency while the modified grease consistency ensures adequate flow to deliver the lubricating material to sliding surfaces
3Ease of operation
If lubricating oil is used for lubrication, then flowability is excellent and stick-slip is reduced, but consumption increases and scattering occurs
Solution Approach 1:
The patent develops a composite lubricating composition that combines the flowability benefits of lubricating oil with the consumption-reduction benefits of grease, creating a semi-liquid grease that exhibits properties of both material types
Solution Approach 2:
The patent modifies the consistency parameters to create a pumpable semi-liquid state that maintains sufficient flowability for immediate oil film formation while reducing consumption compared to conventional lubricating oils
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
The lubricating grease composition enables efficient lubrication with minimal leakage and improved processing precision by preventing the stick-slip phenomenon and reducing environmental impact.
Implementation Method 1
a base oil having a kinematic viscosity at 40°C of 10 to 200 mm²/s
Implementation Method 2
the lubricating grease composition enables efficient lubrication with minimal leakage and improved processing precision by preventing the stick-slip phenomenon
Implementation Method 3
adding to the base oil solid particles insoluble in the base oil
Data Source
AI summary
The invention provides a lubricating grease composition with a worked penetration of 400 to 500 for a machine tool equipped with an automatic lubricator, containing a base oil having a kinematic viscosity at 40°C of 10 to 200 mm2/s and 0.1 to 10 mass% of solid particles insoluble in the base oil. The lubricating grease composition of the invention can be fed using the automatic lubricator attached to the machine tool, and can prevent the stick-slip from occurring on the sliding lubrication portion of the machine tool.