Modular Drill Tip Locking for Stable Clamping Under Vibration
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Solution Overview
Problem
Modular drills face challenges with reduced clamping force due to high cutting forces, thermal variations, side forces, or vibration, leading to loosening or reduced life of the cutting tip.
Innovation Solution
A modular drill design featuring a shank with flutes and flanks for clamping the cutting tip, a connection shaft with a guide path for the guide pin, and a locking pin mechanism to securely hold the cutting tip in place, ensuring stability during drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clamping mechanism is used to hold the cutting tip in the shank, then the cutting tip can be securely retained, but the clamping force is reduced under high cutting forces, thermal variations, side forces or vibration causing loosening
Solution Approach 1:
The connection shaft is segmented into multiple functional zones: an inclined surface for initial engagement, a guide path for lateral guidance, and a locking pin engagement feature for final securing. This segmentation allows each zone to contribute to the overall clamping reliability without requiring excessive force from a single mechanism.
Solution Approach 2:
The guide pin acts as an intermediary element between the shank and cutting tip. It travels through the guide path in the connection shaft, providing lateral guidance and stability during the assembly process, which prevents misalignment and reduces the burden on the clamping mechanism.
2Reliability
If a locking mechanism is added to secure the cutting tip, then retention is improved, but the device complexity increases
Solution Approach 1:
The locking pin mechanism is merged with the connection shaft structure. The locking pin engagement feature is integrated into the connection shaft, and the locking pin itself is a simple cylindrical element that passes through aligned holes in the shank and connection shaft. This merging approach provides reliable locking without adding separate complex subsystems.
Solution Approach 2:
The inclined surface on the connection shaft automatically guides the locking pin into its engagement feature during assembly. The geometry of the inclined surface and guide path causes the locking pin to self-align and engage without requiring external alignment tools or complex positioning mechanisms.
3Reliability
If the cutting tip is tightly clamped to withstand cutting forces, then retention is improved, but assembly and disassembly becomes difficult
Solution Approach 1:
The connection shaft incorporates an inclined surface that transforms the assembly motion into a self-locking action. During assembly, the connection shaft moves along the inclined surface, which automatically drives the locking pin into engagement. During disassembly, reversing the motion causes the locking pin to disengage naturally. This dynamic mechanism provides strong retention during operation while enabling easy assembly and disassembly.
Data Source
AI summary
A modular drill including a shank having a shank bore therein, a guide pin tip disposed in the shank bore, a cutting tip, and a connection shaft coupled to the cutting tip, the connection shaft having a connection shaft sidewall and a guide path therein for guiding the guide pin tip therethrough while the connection shaft moves through the shank bore.