Exchangeable Drill Tip Locking for Front-Accessible Secure Mounting
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Solution Overview
Problem
Existing rotary cutting tools face a contradiction between easy mountability and reliable hold of the cutting tip, requiring a compromise that often necessitates accessing the end of the tool for tip changes.
Innovation Solution
A rotary cutting tool with a securing unit that includes a locking geometry with undercuts and torque transmission geometries, allowing for easy mounting and secure hold without requiring access to the end of the tool, utilizing a clamping mechanism or securing pin for enhanced retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple locking geometry is used for easy mounting, then the mounting process becomes quick and simple, but the reliability of holding the cutting tip during operation deteriorates
Solution Approach 1:
The locking mechanism is segmented into multiple independent elements: an undercut of first type for axial retention, an undercut of second type for rotational retention, and a torque transmission geometry. Each segment performs a specific function, allowing the cutting tip to be easily mounted while ensuring reliable holding through the combined action of all segments.
Solution Approach 2:
The locking mechanism uses a composite structure combining different geometric features (undercuts and torque transmission surfaces) that work together to provide both ease of mounting and reliable holding. The combination of form-locking undercuts and friction-based torque transmission creates a multi-functional locking system.
2Reliability
If a secure locking mechanism is implemented to prevent rotational disengagement, then the reliability of the cutting tip hold improves, but the mounting process becomes more complex and time-consuming
Solution Approach 1:
The undercut of the second type is pre-configured on the locking geometry to automatically engage with the locking projection during the mounting process. This preliminary structural arrangement ensures that rotational retention is established before operation begins, without requiring additional mounting steps or complex adjustment procedures.
3Ease of operation
If the cutting tip can be changed from the front without accessing the end of the tool, then the ease of operation improves, but the structural design becomes more complex
Solution Approach 1:
The locking mechanism utilizes angular/rotational dimension in addition to axial dimension. The undercut of the first type provides axial retention, while the undercut of the second type provides rotational retention. This multi-dimensional approach allows the cutting tip to be securely locked and changed from the front without requiring access to the end of the tool, as both retention functions are integrated into the side-accessible locking geometry.
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
Enables quick and easy mounting of the cutting tip while providing a reliable, secure hold during operation, preventing axial pull-out and rotational disengagement, with options for friction-locking or form-locking mechanisms.
Implementation Method 1
a locking geometry having an undercut of a first type and a torque transmission geometry is provided on the shank, wherein the undercut of the first type acts against an axial pull-out direction
Implementation Method 2
the torque transmission counter-geometry abuts the torque transmission geometry. Thus, during operation of the rotary cutting tool, a torque can be transmitted from the shank to the cutting tip in a planar manner
Implementation Method 3
The effect of the securing unit can be friction-locking and/or form-locking
Implementation Method 4
The effect of the securing unit can be friction-locking and/or form-locking
Data Source
AI summary
A rotary cutting tool, in particular a drill, is described, which comprises a shank and an exchangeable cutting tip (14). For this purpose, a locking geometry having an undercut of a first type and a torque transmission geometry is provided on the shank. A locking projection having a torque transmission counter-geometry is provided on the cutting tip, wherein, in a mounted state, the locking projection engages in the undercut of the first type and the torque transmission counter-geometry abuts the torque transmission geometry. The rotary cutting tool further comprises a securing unit, which holds the cutting tip on the shank.