Drill Bit With Intersecting Grooves For Stiffness And Friction Reduction
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Solution Overview
Problem
Conventional drill bits with two primary groove portions have limited stiffness and poor chip discharge, making them unsuitable for high-strength or small-size/micro-size drilling processes, and they often experience unnecessary friction during drilling.
Innovation Solution
A drill bit structure with five groove portions, where the first and second groove portions are partially overlapped to form an intersecting protrusion, increasing the cross-sectional area and stiffness while maintaining adequate chip discharge space, and the fifth groove portion reduces friction by having a smaller outer diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two primary groove portions are used in conventional drill bits, then chip discharge is enabled, but the cross-sectional area is reduced and stiffness is lowered
Solution Approach 1:
The patent introduces a fifth dimension by adding an annular groove (fifth groove portion) that extends axially from the intermediate section toward the connection end. This creates a new dimensional feature that reduces the outer diameter of the bit body, thereby reducing friction with the drilled hole wall without compromising the stiffness provided by the overlapping first four groove portions.
2Ease of manufacture
If two primary groove portions are used in conventional drill bits, then chip discharge is enabled, but unnecessary friction is generated between the bit and hole wall
Solution Approach 1:
The bit body is segmented into different functional zones: the first four groove portions handle chip discharge, while the fifth annular groove creates a reduced-diameter section that minimizes friction contact with the hole wall. This segmentation allows each portion to perform its specific function optimally without interfering with others.
Solution Approach 2:
The annular groove (fifth groove portion) introduces a new dimensional feature that reduces the outer diameter of the bit body in the region where friction occurs, thereby reducing friction with the drilled hole wall without compromising the stiffness provided by the overlapping first four groove portions.
3Strength
If groove portions are overlapped to increase cross-sectional area, then stiffness is improved, but chip discharge space may be reduced
Solution Approach 1:
The annular groove (fifth groove portion) introduces a new dimensional feature that reduces the outer diameter of the bit body in the region where friction occurs, thereby reducing friction with the drilled hole wall without compromising the stiffness provided by the overlapping first four groove portions.
Data Source
AI summary
The present invention relates to a drill bit structure which comprises a body. The body has a free end, an intermediate section and a connection end. The body comprises a first groove portion, a second groove portion, a third groove portion, a fourth groove portion and a fifth groove portion. The first groove portion is partially overlapped with the third groove portion from the free end. The second groove portion is partially overlapped with the fourth groove portion from the free end. After extending a preset axial distance from the free end, the first groove portion and the second groove portion are partially overlapped with each other by forming an intersecting protrusion. The fifth groove portion is extended from the intermediate section toward the connection end. The first, second, third and fourth groove portions are extended to the fifth groove portion.