Rotary Cutting Tool With Differential Point Angles For Burr Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing PCD drills used for drilling composite materials like CFRP-titanium produce high-quality holes initially but quickly develop unacceptable burrs, leading to frequent tool replacement and high costs due to wear and tear.
Innovation Solution
A rotary cutting tool with a polycrystalline-diamond cutting tip featuring a helical flute and differential point angles, along with multiple coolant passages for improved durability and burr control, is designed. The tool includes an inner point angle of 110-140 degrees and an outer point angle of 145-180 degrees, and the coolant passages are formed using extrusion and EDM drilling processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional PCD drills are used, then initial cutting performance is effective, but tool lifespan is short due to rapid wear
Solution Approach 1:
The differential point angle design optimizes each region for its specific function: the inner portion with smaller point angle (110-140 degrees) provides effective cutting action on titanium, while the outer portion with larger point angle (145-180 degrees) reduces burr formation on CFRP. This localized optimization ensures consistent performance throughout the drill's operational life, extending tool lifespan while maintaining cutting effectiveness.
2Manufacturing precision
If frequent tool replacement is performed to maintain hole quality, then manufacturing precision is maintained, but productivity decreases and costs increase
Solution Approach 1:
By implementing differential point angles, the drill maintains consistent hole quality and low burr height throughout its entire service life, eliminating the need for frequent replacements. The inner portion effectively cuts titanium while the outer portion prevents burr formation on composite materials, allowing the tool to produce thousands of high-quality holes continuously, thereby maintaining manufacturing precision while significantly improving productivity.
3Duration of action of moving object
If multiple coolant passages are added to the drill, then cooling effectiveness and tool lifespan are improved, but device complexity increases
Solution Approach 1:
The patent segments the coolant delivery system into multiple separate passages distributed through the drill body, with each passage delivering coolant to different regions of the cutting tip. This segmentation allows efficient heat removal from both the inner and outer cutting edges, extending tool lifespan while using simple, modular passage configurations that minimize manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tool maintains a low burr height and extends the drill's lifespan, reducing the frequency of replacements and associated costs while maintaining hole quality, with the multi-coolant passage design enhancing coolant delivery without compromising strength.
Implementation Method 1
at least two coolant passages passing therethrough, each coolant passage extending from the first end to the cutting tip
Implementation Method 2
The at least two coolant passages may be formed in the generally cylindrical tool body by an extrusion process
Implementation Method 3
The at least two passages may be formed in the tip portion via an EDM drilling process
Implementation Method 4
The tip portion may be coupled to the tool body via a brazing process
Data Source
AI summary
A rotary cutting tool with an elongate body disposed about a longitudinal axis, the elongate body including a helical flute and a polycrystalline-diamond cutting tip. The cutting tip comprises an inner portion having an inner point angle and an outer portion having an outer point angle different from the inner point angle.