Hollow Drill Structure for Chip and Cutting Oil Discharge
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Solution Overview
Problem
Conventional drilling tools lack an efficient mechanism to discharge chips simultaneously with the feeding of a large quantity of cutting oil, as seen in the BTA method, due to their complex and costly structure, and general tools struggle to replicate this performance.
Innovation Solution
A drilling tool with a hollow discharge channel and a curved surface inside the main body guides chips towards the base end during rotation, allowing for efficient chip discharge and simultaneous oil and chip removal, utilizing a helical shape and axisymmetrical design to apply a pushing force on chips and facilitate oil flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the BTA method with special tool structure is used to feed large quantity of cutting oil and discharge chips simultaneously, then chip discharging performance is improved, but device complexity and cost increase
Solution Approach 1:
The drill tube is designed to perform multiple functions: it serves as both the structural component for drilling and as the channel for feeding cutting oil and discharging chips simultaneously. This multi-functional design eliminates the need for separate specialized BTA apparatus while achieving the same chip discharging performance through the integrated hollow structure and curved surface configuration
Solution Approach 2:
Instead of using a solid drill tube as in conventional drilling, the invention inverts the structure by using a hollow drill tube with internal curved surfaces. This inverted hollow structure allows cutting oil to be fed from the outside and chips to be discharged from the inside simultaneously, reversing the conventional flow direction and achieving efficient chip removal without complex external apparatus
2Device complexity
If conventional drilling tools are used without specialized BTA structure, then device complexity is reduced, but ability to discharge chips simultaneously with cutting oil feeding is lost
Solution Approach 1:
The drill tube incorporates curved surfaces (cylindrical or conical curvature) along its internal structure. These curved surfaces generate centrifugal force during rotation that actively guides and propels chips toward the discharge end. This curvature-based mechanism enables efficient chip discharging performance while maintaining a simple, standardized drill tube structure without complex external apparatus
3Productivity
If hollow discharge channel with curved surface is added to guide chips, then chip discharging performance is improved, but manufacturing complexity increases
Solution Approach 1:
The hollow discharge channel is segmented into multiple discrete curved surface sections along the drill tube length. Each section can be independently formed using standard manufacturing processes, and the segments are assembled together to create the complete chip-guiding structure. This segmentation reduces manufacturing complexity while maintaining effective chip discharging performance through the cumulative effect of multiple curved surfaces
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 enables efficient chip and oil discharge with general drilling tools, improving processing performance and reducing costs by eliminating the need for specialized structures, while maintaining high rigidity and expanding the tool's applicability to deep hole drilling.
Implementation Method 1
a force acting to guide chips in a direction towards the base end portion can be applied by the curved surface of the discharge channel during rotation of the tool
Implementation Method 2
the curved surface is formed with a helical shape around the rotation axis of the drilling tool
Data Source
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AI summary
A drilling tool with improved structure to improve chips discharging performance. The drilling tool comprises a cutting insert 60 having a cutting edge 62 at the front end portion and a main body 10 mounted with the cutting insert 60, further, the drilling tool comprises a hollow discharge channel 12 formed inside the main body 10, and the discharge channel 12 has a curved surface 14 for guiding the chips S in a direction towards the base end portion opposite to the front end portion.