Pressure-Responsive Drill Coolant Control for Chip Evacuation
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Solution Overview
Problem
Chip jamming occurs during drilling of difficult materials like Titanium alloys, causing blockages in chip flutes and impairing drilling quality and tool longevity.
Innovation Solution
A drill design featuring a flow control element that moves between neutral and active positions in response to pressure differences between coolant channels, redirecting coolant flow to clear jammed chips by increasing pressure in the affected flute, and automatically returning to neutral when the jam is cleared.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coolant flow is distributed equally to both chip flutes, then both flutes are cooled and chips are evacuated, but chip jamming occurs in difficult-to-machine materials
Solution Approach 1:
The flow control element dynamically adjusts coolant distribution between the two coolant channels based on real-time pressure conditions. When chip jamming occurs in one flute, the pressure difference automatically redirects coolant flow to that flute, making the system adaptive rather than static.
Solution Approach 2:
The system uses the pressure difference caused by chip jamming itself as the triggering mechanism to redirect coolant flow. The jamming condition automatically activates the flow control element to correct the problem, without requiring external sensors or control systems.
2Manufacturing precision
If chip jamming is prevented through improved coolant flow, then drilling quality and tool longevity improve, but device complexity increases due to flow control mechanism
Solution Approach 1:
The flow control element is passively actuated by the pressure difference that naturally occurs when chip jamming happens. No external power source, sensors, or control systems are needed - the system uses the jamming condition itself to trigger the corrective action.
Solution Approach 2:
The flow control element acts as a simple mechanical intermediary between the two coolant channels, redirecting flow based on pressure differences. This passive intermediary device adds minimal complexity while effectively solving the chip jamming problem.
3Productivity
If coolant pressure is increased to clear jammed chips, then chip evacuation is improved, but energy consumption and system stress increase
Solution Approach 1:
The flow control element operates periodically - switching to the active position when pressure difference indicates jamming, then returning to neutral when the jam is cleared. This periodic action avoids continuous high-energy operation while maintaining effective chip evacuation when needed.
Solution Approach 2:
The system changes the coolant flow distribution parameter dynamically based on operating conditions. Instead of maintaining constant high pressure in both channels, the system adjusts flow distribution to concentrate pressure where needed, reducing overall energy consumption.
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
Effectively prevents and resolves chip jamming by ensuring continuous coolant flow and chip evacuation, maintaining drill tool integrity and hole quality, without external assistance or actuators, and is durable for harsh drilling conditions.
Implementation Method 1
The flow control element is arranged to move from said neutral position to said active position in response to a flow restriction in one of the chip flutes
Data Source
Figure 1a~1b
Figure 2~3
Figure 4~4c
AI summary
A drill 10 for metal cutting machining having a central rotation axis C defining a longitudinal direction of the drill 10 and around which the drill is rotatable, comprising: an axially front end 12, an axially rear end 14, an envelope surface extending between the front end 12 and the rear end 14, a shaft extending axially rearward from the front end 12, a shank extending axially forward from the rear end 14, at least one cutting insert 18 releasably mounted at the front end 12, a first 25 and a second chip flute 26 in the envelope surface 16 of the shaft 22, a coolant chamber 32 inside the shank, a first 27 and second coolant channel 28 extending from the front end of the coolant chamber 32 and terminating at the front end 12 of the drill, the first coolant channel 27 is associated with the first chip flute 25 and the second coolant channel 28 is associated with the second chip flute 26, wherein the coolant chamber 32 comprises a flow control element 50, which is movable between a neutral position, in which coolant flow is distributed substantially equally to the first 27 and second coolant channels 28, and an active position, in which the flow control element 50 directs the coolant flow at least mainly to one of said coolant channels 27, 28, and that the flow control element 50 is arranged to move from said neutral position to said active position in response to a flow restriction in one of the chip flutes 25, 26, such that the coolant is directed at least mainly to said one coolant channel 27, 28 associated with the chip flute 25, 26 having a flow restriction.