Drill Point Thinning via Continuous Grinding
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Solution Overview
Problem
Existing drilling tool production methods result in unwanted ridges due to multiple grinding operations, leading to increased mechanical loads and reduced tool accuracy, which are costly to rectify and affect tool lifespan.
Innovation Solution
A single-stage grinding process that thins the chisel edge and grinds chip flutes continuously, eliminating ridges by integrating the thinned region into the chip flute, allowing for a uniform core diameter taper and reducing core diameter, thereby eliminating the need for multiple grinding tool applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple grinding operations are used to thin the chisel edge and grind chip flutes, then the drilling tool can be produced with the required geometry, but unwanted ridges are formed on the finished tool
Solution Approach 1:
The patent combines the thinning of the chisel edge and the grinding of chip flutes into a single continuous grinding operation. The grinding tool is designed with specific geometry (including a relief surface and cutting edges) that allows it to simultaneously thin the chisel edge while grinding the chip flutes in one pass, eliminating the need for multiple separate grinding operations that would otherwise create ridges at the transition zones.
2Ease of manufacture
If ridges are left on the drilling tool, then production costs are reduced, but the accuracy of running and mechanical loads are impaired
Solution Approach 1:
By merging the chisel edge thinning and chip flute grinding into one operation, the patent eliminates ridges without requiring additional finish machining processes. This approach maintains tool accuracy and reliability while avoiding the increased costs that would result from multiple grinding operations or post-grinding finish machining.
3Object-generated harmful factors
If a single grinding operation is used, then ridges are eliminated, but the grinding tool must perform multiple functions
Solution Approach 1:
The grinding tool is designed with multi-functionality, incorporating a relief surface and multiple cutting edges that enable it to simultaneously thin the chisel edge and grind the chip flutes in one operation. This universal design allows a single grinding tool to perform multiple functions that would otherwise require separate specialized tools, eliminating ridges while maintaining process simplicity.
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
This approach enhances tool accuracy, reduces mechanical loads, and extends tool lifespan by eliminating ridges and allowing for versatile cutting edge configurations suitable for various applications, including small batch production and use with 5-axis machine tools.
Implementation Method 1
the grinding tool, which is generally formed by a rotating grinding disk, is in each case applied again to the drill blank to be ground in order to grind the major cutting edges and the chisel edge
Data Source
AI summary
A drilling tool includes at least two chip flutes and a chisel edge with a thinned region. The thinned region merges continuously into the chip flutes in such a way that the thinned region forms the end of the respective chip flute in the region of the chisel edge.