Micro-Reinforced Concentric Twist Drill for Stable High-Hardness Drilling
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Solution Overview
Problem
Current drilling tools experience instability, low efficiency, and poor drilling accuracy due to uneven force distribution and damage from rotary cutting forces, leading to short service life and high resistance during machining of high-hardness materials.
Innovation Solution
A micro-reinforced concentric twist drill design featuring symmetrically arranged micro-reinforced center drills and reamers with wear-resistant grooves and tables, reducing resistance and enhancing stability by distributing forces more evenly and maintaining cutting edge sharpness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional single spiral cutting edge structure is used, then the drill can perform basic cutting function, but the cutting edge is easily damaged due to concentrated rotary cutting forces and centrifugal forces
Solution Approach 1:
The single spiral cutting edge is segmented into multiple spiral cutting edges (first spiral cutting edge and second spiral cutting edge) that are symmetrically distributed. This segmentation distributes the cutting forces across multiple edges, preventing any single edge from being overloaded by concentrated rotary cutting forces and centrifugal forces, thereby improving both strength and durability.
Solution Approach 2:
The patent employs symmetric asymmetry by creating two identical spiral cutting edges that are mirror images of each other, symmetrically distributed around the drill axis. This symmetric arrangement balances the force distribution during rotation, reducing the impact of centrifugal forces on any single cutting edge while maintaining effective cutting action.
2Manufacturing precision
If conventional drilling structure is used, then the drill can perform drilling operation, but the tool experiences instability and poor drilling accuracy due to unbalanced force distribution
Solution Approach 1:
The symmetric arrangement of two identical spiral cutting edges creates force balance during rotation. The cutting forces generated by each edge are equal and opposite, canceling out imbalances and reducing vibrations. This force balancing significantly improves drilling stability and accuracy by preventing tool oscillation and deflection.
Solution Approach 2:
The second spiral cutting edge acts as a counterbalance to the first spiral cutting edge. The symmetric distribution of material and cutting edges creates a balanced mass distribution around the rotation axis, reducing centrifugal force imbalances and improving overall drilling stability and precision.
3Productivity
If conventional spiral cutting surface structure is used, then the drill can remove material, but the spiral cutting surface and cutting edge are damaged due to tool instability and force concentration
Solution Approach 1:
The material removal function is segmented across two spiral cutting surfaces instead of one. Each spiral cutting surface handles a portion of the cutting load, distributing the mechanical stress and heat generation. This segmentation prevents any single cutting surface from being overloaded and damaged, extending tool service life while maintaining efficient material removal through combined action of both surfaces.
Solution Approach 2:
The chisel edge with micro-reinforced structure performs preliminary action by creating a centered hole and preparing the material before the spiral cutting edges engage. This preliminary centering action ensures proper force distribution from the outset, preventing instability that would otherwise lead to damage of the spiral cutting surfaces and extending tool life.
4Manufacturing precision
If conventional center drilling structure is used, then the drill can create initial hole, but the structure is not absolutely balanced causing tool swinging and reduced drilling accuracy
Solution Approach 1:
The micro-reinforced center drilling structure is symmetrically arranged with identical features on opposite sides of the drill axis. This symmetric design creates absolute balance in the center drilling portion, eliminating tool swinging during the preliminary drilling phase. The balanced structure ensures accurate hole positioning while maintaining tool stability throughout the operation.
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
The micro-reinforced concentric twist drill achieves a 40% increase in rotating speed and feed amount, resulting in a 0.96 times higher comprehensive drilling efficiency and significantly longer tool life by reducing wear and maintaining cutting edge sharpness.
Implementation Method 1
distributing forces more evenly by maintaining cutting edge sharpness
Implementation Method 2
reducing resistance
Implementation Method 3
wear-resistant grooves and tables, reducing wear and maintaining cutting edge sharpness
Data Source
AI summary
A micro-reinforced concentric twist drill. Concentric drilling and micro-reinforcing technologies are applied to cutting faces of the twist drill, and upright micro-reinforced center drills are symmetrically arranged on spiral cutting surfaces on two sides of an axial central area, and extend to the rear cutting surface and form drill center hole cutters in a protruding manner; a micro-reinforced central cutting face is arranged on the inner side of each micro-reinforced center drill in a protruding manner, and the micro-reinforced central cutting face extends to the axial front and intersects with the rear cutting surface to form a micro-reinforced central drilling edge of the micro-reinforced concentric twist drill; and/or upright micro-reinforced reamers are symmetrically arranged on central areas of the spiral cutting surfaces on two sides of the axial center in an integral manner; a protruding reaming cutting face is formed on the inner side of each micro-reinforced reamer.