Diamond Drill Tip Geometry for Better Chip Evacuation
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Solution Overview
Problem
Drills made of diamond often break due to chip accumulation between the drill and the drilled hole, leading to a shortened tool life.
Innovation Solution
A drill design featuring a blade tip part formed of diamond with N cutting edges, each leading to an apex of an N-gonal pyramid, and a proportion of S1 to S2 between 30% and 60%, where S1 is the area of the drill in cross-section and S2 is the area of a circle with a radius, enhancing chip evacuation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a drill with conventional blade tip design is used, then the drilling function is provided, but chip accumulation occurs between the drill and drilled hole causing breakage and shortened tool life
Solution Approach 1:
The blade tip part is divided into multiple cutting edges (N≥4) arranged around the drill axis, creating multiple chip evacuation pathways. This segmentation prevents chip accumulation by distributing chips across multiple evacuation routes, reducing the likelihood of blockage and subsequent drill breakage.
Solution Approach 2:
The invention introduces a specific cross-sectional area ratio (S1/S2 between 30-60%) as a dimensional parameter to optimize chip evacuation. By controlling the relationship between the drill's cross-sectional area and the hole area, the design creates optimal spacing for chip removal in the radial dimension, preventing chip accumulation that leads to breakage.
2Productivity
If the blade tip part has N cutting edges with N-gonal pyramid shape, then chip evacuation performance is improved, but manufacturing complexity increases
Solution Approach 1:
The invention specifies a quantitative range for the cross-sectional area ratio (S1/S2 between 30-60%) rather than a fixed value. This parameter range provides manufacturing flexibility while ensuring optimal chip evacuation performance, allowing manufacturers to work within acceptable tolerances without compromising the N-gonal pyramid geometry's effectiveness.
3Object-generated harmful factors
If the cross-sectional area ratio S1/S2 is optimized between 30-60%, then chip evacuation is enhanced, but the drill design becomes more complex
Solution Approach 1:
The invention defines a specific range (30-60%) for the cross-sectional area ratio S1/S2, transforming a complex geometric design problem into a manageable parameter optimization. This quantitative specification simplifies the design process by providing clear boundaries for achieving effective chip evacuation without requiring overly complex geometries.
Data Source
AI summary
A drill includes a blade tip part that is formed of diamond and a trunk part that is formed of diamond and is continuous with the blade tip part, the drill rotating about a drill axis, the blade tip part includes N cutting edges where N is an integer of no less than 4, and a proportion of S1 to S2 is no less than 30% and no more than 60%, where S1 is an area of the drill in a cross-section with the drill axis as a normal line, the cross-section including a boundary between the blade tip part and the trunk part, r is a maximum value of a distance from the drill axis to an outer edge of the drill in the cross-section and S2 is an area of a circle with r as a radius.