Multidiameter Cutting Tool Oil Passages for Balanced MQL Flow
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Solution Overview
Problem
Conventional machining tools with internal liquid lubricant passages experience unbalanced lubricant flow when used in minimum quantity lubrication (MQL) machining due to the compressible nature of air-oil mist, leading to inefficient lubrication and excess wear on tools.
Innovation Solution
The cutting tool design includes a trunk passage and independent passages that deliver a mixture of oil and air to cutting edges of varying diameters, ensuring balanced lubrication by providing separate pathways for each edge, independent of the trunk passage, to address the unbalanced flow issue in MQL machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional liquid lubricant passages are used in MQL machining, then the tool structure is simple and easy to manufacture, but the lubricant flow becomes unbalanced with excessive flow to larger diameter edges
Solution Approach 1:
The lubrication system is segmented into multiple independent passages, each dedicated to a specific cutting edge. This segmentation prevents the unbalanced flow that occurs in conventional shared passages, as each passage independently controls lubricant delivery to its corresponding edge, ensuring precise flow balance despite variations in edge diameter.
Solution Approach 2:
Each cutting edge receives customized lubricant delivery through its dedicated independent passage. The passage geometry, size, and positioning are optimized locally for each specific edge's requirements, rather than using a uniform distribution system. This local optimization ensures that each edge receives the appropriate amount of lubricant regardless of its diameter or position.
2Manufacturing precision
If independent passages are provided for each cutting edge, then lubricant flow balance is improved, but the device complexity increases
Solution Approach 1:
The independent passages are designed with a standardized configuration that serves multiple cutting edges uniformly. Each passage follows the same structural pattern and delivery mechanism, allowing the complex multi-edge lubrication system to be constructed from repeated modular units. This universality reduces the overall complexity compared to fully customized passages for each edge.
3Productivity
If compressible air-oil mist is used instead of incompressible liquid lubricant, then MQL machining efficiency is improved, but flow distribution to multiple edges becomes unbalanced
Solution Approach 1:
The compressible air-oil mist flow is segmented into separate independent passages for each cutting edge. This segmentation prevents the mist from redistributing unevenly among edges, as each passage independently channels the lubricant mixture directly to its designated edge, maintaining flow uniformity despite the compressible nature of the MQL medium.
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 design ensures efficient distribution of lubricant to all cutting edges, reducing waste and wear on the tool by providing a tailored lubrication system for each edge, enhancing the performance of MQL machining.
Implementation Method 1
the lubricant mist acts as a compressible fluid (unlike the incompressible liquid lubricant of conventional machining)
Data Source
AI summary
A cutting tool includes a body having a base and a cutting portion. The cutting portion defines a plurality of first edges and a plurality of second edges. The body defines a trunk passage, a plurality of first branch passages, and a plurality of first independent passages. Each of the first branch passages is open to the trunk passage and has an outlet open to an exterior of the cutting portion proximate to a corresponding one of the second edges. Each of the first independent passages is independent of the trunk passage and the first branch passages and has an outlet open to an exterior of the cutting portion proximate to a corresponding one of the first edges.