Drill Groove Design for Dust Flow and Pressure Equalization
Solution Overview
Problem
Conventional drills with axial grooves face issues with drill dust flow and pressure equalization during chiseling operations, as the flow of dust can be turbulent at groove intersections, affecting efficiency and performance.
Innovation Solution
A drill design featuring multiple axial grooves with varying widths that intersect with helical grooves, where the groove width decreases to a narrowest point and then increases, directing drill dust efficiently along the helical grooves for effective removal, and a manufacturing method involving longitudinal rolling to create these grooves, breaking symmetry and compensating for torsional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If axial grooves are added to the drill shank, then pressure equalization within the borehole is improved, but drill dust flow becomes turbulent at groove intersections
Solution Approach 1:
The axial grooves are designed with variable cross-sections, featuring narrowest points positioned at or near intersections with helical grooves. This local variation in groove geometry controls dust flow behavior at critical locations while maintaining pressure equalization function throughout the groove system.
Solution Approach 2:
The axial grooves incorporate asymmetric width variations along their length, with specific narrowest points created at strategic locations. This asymmetric design breaks the symmetry of dust flow paths at intersections, redirecting flow preferentially along helical grooves rather than creating turbulence at groove crossings.
2Object-generated harmful factors
If the groove width is reduced at intersections, then drill dust flow along helical grooves is improved, but the groove volume for debris removal is reduced
Solution Approach 1:
The narrowest points of the axial grooves are strategically positioned at or near intersections with helical grooves, creating localized flow control zones. The groove width increases between these narrowest points, providing sufficient volume for debris accumulation and removal while maintaining flow directionality at critical intersection locations.
3Ease of manufacture
If conventional cross rolling process is used to create helical grooves, then manufacturing is simplified, but torsional forces during rolling are not compensated
Solution Approach 1:
The blank is intentionally designed without mirror symmetry with respect to planes containing the axis. This asymmetric initial configuration compensates for torsional forces that occur during the rolling process, improving manufacturing quality while maintaining process feasibility.
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
The invention relates to a drill (1) having a shaft (4) along an axis (2) between a drill head (3) and an insertion end (5). The shaft (4) is provided with at least two first grooves (34) extending along the axis (2) and at least one second helical groove (31). The first grooves (34) and the second groove (31) cross one another at several intersections (41). A groove width (35) of the first groove (34) continuously decreases in the course between two adjacent intersections (41) from one of the intersections (41) to a narrowest point (42). After the narrowest point (42), the groove width (35) continuously increases to the other of the intersections (41).