Cone Twist Drill With Composite Blades for Precise Low-Force Drilling
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Solution Overview
Problem
Conventional twist drills are difficult to position and operate efficiently, requiring significant arm strength and power, leading to low drilling speed and efficiency, and are prone to damage due to high reaction forces and burr generation.
Innovation Solution
A twist drill design featuring a shank portion with a cone and cylinder operation portion, equipped with a spiral flute for chip evacuation and composite cutting blade groups with varying diameters, forming a top blade for precise positioning and dispersing cutting forces, reducing reaction forces and burr formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional twist drill with two symmetric linear cutting edges is used, then drilling operation can be performed, but high power and arm strength are required leading to low drilling speed and efficiency
Solution Approach 1:
The single cutting edge is segmented into multiple composite cutting blade groups (first, second, third, and fourth groups) distributed around the drill axis. Each group contains multiple cutting blades arranged radially, dividing the cutting workload across multiple elements rather than concentrating it on two linear edges, thereby reducing the power required per blade and improving overall drilling efficiency
Solution Approach 2:
The cutting structure transitions from two-dimensional linear cutting edges to three-dimensional composite blade groups with radial arrangement. The cutting blades are distributed in multiple radial directions within each composite group, adding a radial dimension to the cutting action and enabling more efficient material removal with reduced power requirements
2Reliability
If conventional twist drill with two symmetric linear cutting edges is used, then drilling operation can be performed, but large reaction forces are applied onto cutting edges making them easy to be damaged
Solution Approach 1:
The cutting force is segmented and distributed across multiple composite blade groups and individual cutting blades within each group. Instead of concentrating reaction forces on two linear edges, the forces are divided among numerous cutting elements arranged radially, reducing the force burden on each individual blade and improving durability
Solution Approach 2:
The cutting blades within each composite group are arranged asymmetrically in radial directions rather than symmetrically along a single line. This asymmetric radial distribution helps balance reaction forces more effectively across the drill structure, preventing excessive stress concentration on any single cutting edge
3Measurement precision
If conventional twist drill is used, then drilling operation can be performed, but it is difficult to position the drill hole
Solution Approach 1:
The multiple composite cutting blade groups are arranged to progressively engage the workpiece material during drill advancement. The radial distribution of cutting blades creates preliminary cutting actions that guide and stabilize the drill position before the full cutting load is applied, improving positioning accuracy and ease of operation
4Manufacturing precision
If conventional twist drill is used, then drilling operation can be performed, but burr formation occurs and tool life is reduced
Solution Approach 1:
The cutting action is segmented into multiple stages involving different composite blade groups engaging the material at different radial positions. This segmented cutting approach produces finer chip formation with each blade group, reducing burr formation and extending tool life by distributing wear across multiple cutting elements
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.