Tool Holder Helical Channels Prevent Lubricant Segregation
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Solution Overview
Problem
Existing devices for tool holding face issues with lubricant segregation at higher speeds, leading to inadequate lubrication of tools, increased wear, and higher costs due to the need for lubricant channels and cooling systems.
Innovation Solution
The device features channels with enlarged cross-sections from inlet to outlet, offset configurations, and Laval nozzle outlet openings to prevent segregation, ensuring uniform lubricant distribution and eliminating the need for internal cooling channels, produced through sintering for simplicity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If channels with constant cross-section are used, then the device structure is simple, but lubricant segregation occurs at higher speeds
Solution Approach 1:
The patent applies parameter changes by varying the cross-sectional area of the channels along their length. Specifically, the cross-sectional area increases from the inlet to the outlet, which compensates for the centrifugal forces causing segregation at high rotational speeds. This gradual expansion maintains uniform lubricant distribution without requiring complex additional components.
Solution Approach 2:
The channel design transitions from a static constant cross-section to a dynamic varying cross-section that adapts to the operational conditions. The expanding geometry allows the channel to dynamically respond to the centrifugal forces generated during high-speed rotation, ensuring consistent lubricant flow distribution throughout the tool.
2Temperature
If internal cooling channels are added to the tool, then cooling performance is improved, but tool stability decreases and wear increases
Solution Approach 1:
The patent extracts the cooling function from the tool itself by providing cooling through the device's channels instead. This separates the cooling system from the tool structure, allowing the tool to maintain its structural integrity and stability while still receiving adequate cooling through the externally provided lubricant channels.
3Reliability
If lubricant channels are integrated into the tool, then lubrication is improved, but manufacturing costs increase
Solution Approach 1:
The patent merges the lubricant delivery function into the device structure itself rather than requiring separate channels within the tool. The device's walls and structure are formed to incorporate the channels, combining the holding and lubrication delivery functions into a single integrated component that reduces overall manufacturing complexity and cost.
4Reliability
If channels with enlarged outlet cross-section are used, then lubricant segregation is prevented, but channel complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the cross-sectional area of the channels along their length. The gradual expansion from inlet to outlet is designed to match the centrifugal force distribution, creating an optimized geometry that prevents segregation while maintaining manufacturing feasibility through simple expansion ratios.
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 ensures consistent lubricant supply, reduces tool wear, and lowers costs by preventing lubricant segregation, maintaining tool stability and quality even at high speeds.
Implementation Method 1
the outlet openings of the channels are designed as Laval nozzles, which are directed in the direction of the central axis of the device. By using such a Laval nozzle, the droplets contained in the aerosol are broken up
Implementation Method 2
it can be provided that the device is produced by sintering
Data Source
Figure 1~2
Figure 3~4
AI summary
A device (1) for holding a tool (3) has a cavity (2) for the tool (3) and at least two channels (6) designed to allow the passage of a lubricant, each channel having an inlet opening (7) and an outlet opening (8) for the lubricant. The at least two channels (6) have a cross-section which increases in size from the inlet opening (7) to the outlet opening (8) and run helically around the bore (2).