Drill Bit Convex Point Thinning for Chip Evacuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In drilling tools, inadequate chip evacuation at the center leads to higher cutting forces, and existing grinding processes often create disturbing edges that obstruct chip flow and lead to inaccuracies due to poor guidance during drilling, especially in inhomogeneous materials.
Innovation Solution
A drill bit design featuring a convexly curved point thinning on the tool flank that transitions smoothly into the chip flute, avoiding edges and ensuring efficient chip evacuation, combined with a forward-positioned land on the drill back for improved guidance, achieved through additional machining steps and specific grinding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If point thinning is made by additional grinding operation to improve chip evacuation, then chip evacuation is improved, but disturbing edges are formed in the transition to the chip flute
Solution Approach 1:
The point thinning is configured to extend in a convex course in the principal direction leading from the tool flank in the direction of the chip flute, creating a rounded, edge-free transition surface that eliminates disturbing edges while maintaining improved chip evacuation capability
2Manufacturing precision
If special grinding process is used to make tool flank descend steeply without edges, then edge quality is improved, but point thinning operation is replaced and additional material removal is reduced
Solution Approach 1:
The point thinning is integrated into the tool flank structure and configured to extend in a convex course, merging the functions of material removal and edge formation into a single continuous surface that achieves both chip evacuation improvement and edge-free transition
3Ease of operation
If land is positioned at rear end of drill back for guidance, then guidance is improved, but land is set back with wide spacing reducing effectiveness
Solution Approach 1:
The land is positioned at the front end of the drill back, utilizing the axial dimension more effectively to provide guidance at the critical entry point of drilling, where it can most effectively prevent tilting and ensure accuracy in inhomogeneous materials
Data Source
AI summary
In order to ensure good guidance of a drilling tool at the start of a drilling operation and at the same time ensure a reliable evacuation of a center chip, in the drill bit, in a tool flank adjoining a respective main cutting edge, an additional point thinning is recessed in the region of a transverse cutting edge, which additional point thinning, extending in a principal direction from the tool flank, merges, with a convex course, into a chip flute. As a result of the convex design, an as far as possible homogeneous, edge-free transition into the chip flute is obtained. Since the point thinning is additionally made, the tool flank, even in the rear end facing away from the cutting edge, remains at a front axial position, so that a second land is effective for a reliable guidance of the bore already at an axially front position.