Step Drill Flute Merging for Deep Chip Discharge Stability
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Solution Overview
Problem
Step drills face challenges in safe and efficient shaving discharge due to differing shaving angles and cutting speeds between the drill tip and step, leading to potential blockages and reduced stability, especially at greater drilling depths.
Innovation Solution
A step drill design where the flutes of the drill tip and drill step merge at a distance from the distal end, forming a single flute, allowing separate shaving flow and discharge, which increases stability and prevents blockages, with preferred embodiments including converging flutes and varying core diameters to enhance shaving discharge and tool strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate flutes are provided for drill tip and drill step cutters, then shavings discharge is improved and blockages are prevented, but tool stability is significantly weakened
Solution Approach 1:
The patent merges the flutes of the drill tip and drill step into a single common flute structure. The flute starts at the drill tip, extends through the drill step region, and continues to the proximal end, creating one unified shavings discharge path that serves both cutting sections while maintaining tool structural integrity.
Solution Approach 2:
The patent segments the flute into functional zones: a first section for receiving shavings from drill tip cutters, a second section for receiving shavings from drill step cutters, and a merging section where shavings from both sections combine. This segmentation allows separate shavings collection while maintaining a unified discharge path.
2Ease of manufacture
If the same number of flutes as cutters is used on the drill tip, then manufacturing is cost-efficient and stability is good, but shavings collision occurs causing blockages
Solution Approach 1:
The patent combines multiple separate flute structures into one unified flute that serves multiple cutting sections. This single flute design prevents shavings from different cutters from colliding and blocking each other, while still maintaining manufacturing efficiency and structural stability.
3Reliability
If additional flutes are added for drill step cutters, then shavings collision is prevented, but tool stability is significantly reduced
Solution Approach 1:
The patent merges the additional flutes needed for drill step cutters into a single common flute structure that already exists for the drill tip. This eliminates the need for separate additional flutes that would weaken the tool, while still providing adequate shavings discharge capacity for all cutters.
4Reliability
If small additional flutes are provided for drill step cutters, then shavings discharge path is created, but shavings discharge from great depth becomes difficult
Solution Approach 1:
The patent creates a unified flute with sufficient cross-sectional area that can handle shavings from both drill tip and drill step cutters simultaneously, even at great drilling depths. The merged flute design provides adequate discharge capacity that small separate flutes could not achieve.
Data Source
AI summary
A step drill includes a distal end, an opposite proximal end, a drill tip and at least one drill step. The drill tip has a tip at the distal end of the step drill and comprises a first number of geometrically defined cutters, each of which is paired with a first flute and lies on an imaginary first circular line about a longitudinal axis of the step drill. The imaginary first circular line has a first radius. The at least one drill step is arranged at a distance from the distal end and has an end face with a second number of geometrically defined cutters each of which is paired with a second flute and lies on an imaginary second circular line that runs about the longitudinal axis of the step drill and has a second radius. The first radius is smaller than the second radius. The first flutes of the drill tip and the second flutes of the drill step merge in a region, which is arranged at a greater distance from the distal end than the end face of the drill step, and form a single flute.