Non-round Grinding for Drill Tip Supporting Chamfers
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Solution Overview
Problem
The production of drill tips for modular drilling tools is complicated due to the short axial length, requiring multiple grinding steps for forming supporting chamfers, which is inefficient and prone to chucking problems.
Innovation Solution
A method involving non-round grinding to integrate supporting chamfers directly during the formation of the drill tip, eliminating the need for separate grinding steps, using coiled chucking grooves and a single-stage grinding process to create a cant-free drill ridge with axially parallel supporting chamfers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple separate grinding steps are used to form supporting chamfers, then the supporting chamfers can be formed with proper geometry, but the production process becomes complicated and time-consuming
Solution Approach 1:
The patent combines the formation of supporting chamfers with the nominal diameter grinding operation into a single non-round grinding step. The grinding wheel is fed radially in a controlled manner during rotation to simultaneously create both the nominal diameter and the supporting chamfers on the ridge, eliminating the need for separate chamfer grinding steps and reducing process complexity
2Manufacturing precision
If multiple separate grinding steps are used to form supporting chamfers, then the supporting chamfers can be formed with proper geometry, but the production time increases
Solution Approach 1:
The patent merges the supporting chamfer formation into the nominal diameter grinding operation, allowing both features to be created in a single continuous grinding pass. This integration eliminates idle time between operations and reduces total production cycle time while maintaining the required geometric precision of the supporting chamfers
3Manufacturing precision
If conventional cylindrical round grinding is used, then the blank can be ground to nominal diameter, but the drill ridge becomes cant-prone and chucking problems occur
Solution Approach 1:
The patent employs non-round grinding where the cross-sectional geometry of the blank is intentionally made asymmetric during the grinding process. The grinding wheel feed pattern creates varying radial distances from the rotation axis, forming an asymmetric ridge profile with integrated supporting chamfers that prevents canting and improves chucking reliability while maintaining nominal diameter accuracy
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
Simplifies the production process, reduces the complexity of grinding geometries, and ensures reliable concentric running of the drill tip by forming supporting chamfers in a single stage, improving guidance and reducing the risk of chucking issues.
Implementation Method 1
a blank is ground, non-round, specifically in such a way that, at each ridge, the radius of the blank first decreases from a starting rotary position corresponding to a cutting corner position and subsequently increases again to form a supporting chamfer
Data Source
AI summary
In order, in a drill tip (2) which is provided particularly for a modular drilling tool, to generate a ridge (18) with supporting chamfers (26, 28) in a simple way, a non-round grinding method is provided, in which, proceeding from a starting rotary position (30) which corresponds to a cutting corner position, the radius is first reduced and is subsequently increased again to form the supporting chamfer (28). There is therefore no need for a separate grinding step to form the supporting chamfers (26, 28). The supporting chamfers (26, 28) preferably extend parallel to the longitudinal mid-axis (22) in the axial direction (24) and intersect coiled chucking grooves (26).