Reversible Fluted Drill Cutting Head Radial Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fluted drill cutting heads lack radial stability and are prone to bending moments, which can lead to inefficient drilling and tool wear, necessitating frequent replacements and material waste.
Innovation Solution
A reversible fluted drill cutting head with a compact shape and angularly disposed cutting head coupling portions, featuring head flute portions for chip evacuation and clamping recesses to direct chip flow, providing radial stability and minimizing bending moments through a unique design that allows for efficient chip management and tool longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fluted drill cutting heads are used, then drilling operations can be performed, but radial stability is insufficient and bending moments occur leading to tool wear and frequent replacements
Solution Approach 1:
The cutting head is divided into two separate drilling portions that can rotate independently relative to each other. Each portion has its own cutting edges and flutes, allowing them to function as separate drilling elements. This segmentation enables one portion to be used while the other rotates in the opposite direction, balancing forces and improving radial stability without increasing overall size.
Solution Approach 2:
The two drilling portions are configured to rotate in opposite directions (one clockwise, one counter-clockwise) relative to the common axis of rotation. This asymmetric rotational configuration creates balanced cutting forces that counteract each other, eliminating bending moments and improving radial stability during drilling operations.
2Reliability
If cutting head size is increased to improve stability, then radial stability improves, but the drill becomes less maneuverable and requires more space
Solution Approach 1:
By segmenting the cutting head into two compact drilling portions that share a common axis, the design achieves stability without requiring a larger overall volume. Each portion is compact but their combined rotational action provides the stability benefit.
Solution Approach 2:
The solution moves from increasing size in one dimension to achieving stability through a different dimensional approach - using bidirectional rotation along the same axis rather than expanding the cutting head radially or axially.
3Productivity
If cutting edges become worn, then drilling efficiency decreases, but replacing the entire drill is costly and wasteful
Solution Approach 1:
When the cutting edges of one drilling portion become worn, that portion can be discarded or replaced while the other portion continues to function. This allows recovery and continued use of the functional portion, avoiding the need to discard the entire drill and reducing material waste.
Solution Approach 2:
The cutting head serves multiple functions with two independent drilling portions, effectively doubling the usable life of the cutting head assembly. Each portion can function independently, providing backup capability and extending operational duration before replacement is needed.
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
A fluted drill has a drill body (12) with a fluted drill cutting head (14) removably secured thereto. The cutting head has two drilling portions (18A, 18B) facing axially opposite directions. In axial view (A), the cutting head has at least four through openings. Each drilling portion includes a plurality of head flute portions (42) and a plurality of cutting head coupling portions (19).