Composite-Blade Twist Drill for Precise Positioning and Lower Cutting Load
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Solution Overview
Problem
Conventional twist drills are difficult to position and are low in speed and efficiency due to limitations in arm strength and power, leading to damaged cutting edges and inefficient drilling processes.
Innovation Solution
A twist drill design featuring a shank portion with a cone and cylinder portion connected by a spiral flute, equipped with composite cutting blade groups of increasing diameters and strategically angled cutting edges, which distribute cutting forces and reduce reaction forces, allowing for smoother and more efficient drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional twist drill with two symmetric linear cutting edges is used, then drilling function is provided, but large power is required and cutting edges are easy to be damaged
Solution Approach 1:
The single cutting edge is segmented into multiple cutting edges (first cutting edge, second cutting edge, third cutting edge, fourth cutting edge) with different orientations and functions. This segmentation distributes the cutting load across multiple edges, reducing the power requirement for each individual edge while improving overall reliability and preventing any single edge from bearing excessive stress that would cause damage.
Solution Approach 2:
The patent introduces asymmetric cutting edge configuration where the first and second cutting edges have different orientations relative to the drill axis, and the third and fourth cutting edges are positioned at different locations. This asymmetric arrangement optimizes the distribution of cutting forces, reduces reaction forces on individual edges, and improves drilling efficiency while lowering power requirements compared to symmetric conventional designs.
2Productivity
If conventional twist drill structure is used, then drilling operation is performed, but positioning difficulty and low speed efficiency occur
Solution Approach 1:
The drill bit incorporates preliminary centering features including a conical leading portion and strategically positioned cutting edges that automatically guide the drill to the correct position before main cutting begins. This preliminary action eliminates positioning difficulties by self-aligning the drill with the workpiece, improving both ease of operation and drilling speed efficiency.
Solution Approach 2:
The patent adds dimensional complexity to the cutting edge arrangement by positioning edges at different angular orientations and axial locations around the drill perimeter. This multi-dimensional cutting edge configuration improves positioning accuracy through better contact geometry with the workpiece surface while simultaneously increasing drilling efficiency through optimized material removal patterns.
Data Source
AI summary
The present invention provides a twist drill. A cone portion is provided at a front end of the operating portion, and an exterior surface of the operating portion is provided with a spiral flute for shunting cutting chips. The exterior surface of the cone portion is provided with a plurality of composite cutting blade groups which are sequentially enlarged in diameter from the front end to the rear end of the cone portion. The cone portion is provided with a top blade on the tip. In use, the top blade is used for positioning, and the cutting process is carried out by the top blade and the composite cutting blade groups.