Twist Drill with Nested Coolant Channels and Variable Helix
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Solution Overview
Problem
Current drilling/chamfering tools face limitations in adjustable drilling depth, cooling lubricant supply, and torsional stability, restricting their use to smaller drilling depths and lacking efficient coolant distribution, which hampers their versatility and effectiveness.
Innovation Solution
A drill with longitudinally variable clamping and helical chip flutes of up to 25° relative to the axis, featuring coolant channels within the drill and a flat bearing face for easy adjustment without rotational movement, enabling deeper drilling and improved lubricant distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coolant channels are added inside the drill to improve cooling lubricant supply, then cooling and lubricating performance is improved, but the cross-section and load-bearing capacity of the drill are reduced
Solution Approach 1:
The patent implements coolant channels nested within the drill structure by forming channels inside the drill body that extend along the drill length. The channels are integrated into the drill's cross-section, with the channel walls forming part of the drill's load-bearing structure. This nesting approach allows coolant delivery without significantly compromising the outer diameter and overall strength of the drill.
Solution Approach 2:
The patent applies different properties to different parts of the drill: the outer shell maintains high strength and stiffness for load-bearing, while the inner region contains coolant channels for thermal management. The drill may also have varying wall thicknesses, with thicker sections at the tip for strength and thinner sections where coolant channels are located, optimizing both cooling and mechanical properties locally.
2Length of moving object
If the drill is made longer to increase drilling depth capability, then drilling depth is improved, but torsional stability and rigidity are reduced
Solution Approach 1:
The patent employs a progressive helix angle design where the chip flute helix angle varies along the length of the drill. The helix angle is smaller near the drill tip and increases toward the tail end. This dynamic variation optimizes chip evacuation in deeper sections while maintaining torsional stability in the shorter, more critical near-tip region. The varying helix angle allows the drill to achieve greater effective drilling depth without proportionally sacrificing torsional rigidity.
Solution Approach 2:
The drill is segmented into functional zones: a near-tip section with smaller helix angle for stability and initial cutting, and a distal section with larger helix angle for chip evacuation and extended reach. This segmentation allows different portions of the drill to serve different purposes, enabling deeper drilling while maintaining overall structural integrity.
3Productivity
If the helix angle of chip flutes is increased to improve chip evacuation, then chip removal is improved, but torsional stability is reduced
Solution Approach 1:
The patent implements a dynamic helix angle profile along the drill length, with the angle varying progressively from the tip to the tail. This dynamic design allows the chip flutes to have optimal evacuation geometry in the distal sections while maintaining smaller, more stable helix angles in the near-tip sections where torsional stability is critical for cutting performance.
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 allows for flexible, efficient drilling and chamfering operations beyond three times the drill diameter, maintaining stability and ensuring adequate cooling, thus expanding the tool's applicability and performance.
Implementation Method 1
at least one channel (10) for a cooling lubricant, which extends along the drill (3) inside the hollow shank (13)
Implementation Method 2
chip flutes (8) with a helix angle of maximally 25° relative to the axis (A) of the drill (3)
Data Source
AI summary
A twist drill for drilling with a countersink cutting arrangement, and a cutting tool with a countersink cutting arrangement, and a cutting-chamfering tool. The abstract of the disclosure is submitted herewith as required by 37 C.F.R. §1.72(b). As stated in 37 C.F.R. §1.72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading “Abstract of the Disclosure.” The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims. Therefore, any statements made relating to the abstract are not intended to limit the claims in any manner and should not be interpreted as limiting the claims in any manner.