Exchangeable Drill Bit Cutting Portion With Magnetic Pin Locking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drill bits with combined plug and solder connections require a heat source and soldering device for quick replacement of cutting sections, making on-site replacements impractical and increasing material costs due to the need for a certain height of the cutting section to prevent heat-affected zones.
Innovation Solution
The drill bit employs magnetic pin connections, where pin elements act as permanent magnets, allowing for easy and quick exchange of cutting sections without the need for precise alignment or destructive disassembly, using plug and pin connections that secure the cutting and drill shaft sections against twisting and displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If combined plug and solder connection is used to connect cutting section and drill shaft section, then connection strength is improved, but replacement complexity increases due to requirement of heat source and soldering device
Solution Approach 1:
The connection system is segmented into modular components: an outer connecting element with receiving bores and an inner connecting element with pin connections. This segmentation allows the cutting section to be replaced by simply removing pins rather than applying heat, reducing replacement complexity while maintaining connection strength through the modular design
Solution Approach 2:
The soldering process (thermal/mechanical system requiring heat source) is replaced with a purely mechanical pin connection system. The pin elements engage with receiving bores through simple insertion and extraction actions, eliminating the need for heat sources and soldering devices while maintaining secure connection
2Reliability
If cutting section height is increased to prevent heat-affected zones during soldering, then connection reliability is improved, but material cost increases
Solution Approach 1:
The mechanical pin connection system eliminates the need for thermal processes entirely, removing the requirement for a minimum cutting section height to protect against heat-affected zones. This allows optimization of cutting section dimensions based purely on functional requirements rather than thermal protection needs, reducing material waste
Solution Approach 2:
The connection method parameters are changed from thermal (soldering temperature, heat exposure time) to mechanical (pin insertion force, engagement depth). This parameter change allows the cutting section to be designed with minimal height required for pin engagement rather than for thermal protection, reducing material consumption
3Ease of operation
If pin connections are used to connect cutting section and drill shaft section, then replacement ease is improved, but alignment precision requirement increases
Solution Approach 1:
The outer connecting element features asymmetric design with receiving bores positioned at specific locations and orientations. This asymmetric geometry provides built-in alignment guidance that ensures proper orientation during pin insertion, reducing the precision required for manual alignment while maintaining secure connection
Solution Approach 2:
The pin connection system incorporates self-aligning features where the receiving bores and pin geometries guide the connection elements into proper alignment automatically during insertion. This self-service alignment mechanism reduces the skill and precision required for replacement operations while ensuring accurate positioning
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 design reduces equipment outlay and minimizes the risk of damaging connections during replacement, enabling quick and efficient exchange of cutting sections, while maintaining secure alignment and preventing material wastage by eliminating the need for precise alignment and heat-based soldering.
Implementation Method 1
The pin connections are designed as magnetic pin connections, with the pin element or one of the connecting elements being designed as a permanent magnet
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
Drill bit (10), which is rotatable about a drilling axis (23), having a drill shaft portion (12) with a first plug-in connecting element, a cutting portion (11) with a second plug-in connecting element, which forms a plug-in connection with the first plug-in connecting element, wherein the cutting portion (11) has a number of sub-cutting portions (16.1-16.4) in each case with a sub-ring portion (18.1-18.4) and at least one cutting segment (19.1-19.4), wherein each sub-ring portion (18.1-18.4) forms a plug-in connection with the first plug-in connecting element and can be connected to the first plug-in connecting element by means of a pin connection.