Selective Abrasive Mill Bit for Wind Blade Resin Clogging
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Solution Overview
Problem
Conventional finishing mill bits used in wind turbine blade manufacturing experience excessive wear and clogging due to reactivation of resin particles, leading to frequent replacements and increased manufacturing costs.
Innovation Solution
A mill bit design featuring helical flutes without abrasive coating, selective abrasive coating on cutting surfaces, and strategically placed porting bores to enhance airflow and reduce temperature, allowing for improved cutting action and extended operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional finishing mill bits with complete abrasive coating are used, then cutting capability is improved, but resin particle reactivation and clogging occur leading to frequent replacement
Solution Approach 1:
The mill bit applies abrasive coating only to specific cutting surfaces (teeth and edges) while leaving flutes and certain areas uncoated. This localized coating strategy maintains cutting effectiveness on contact surfaces while preventing resin accumulation in flutes, thereby extending operating life without sacrificing productivity
Solution Approach 2:
The invention extracts the abrasive coating from areas where it causes harm (flutes and non-cutting surfaces) while retaining it only where cutting function is needed. This selective removal prevents resin particle reactivation and clogging in the flutes, allowing continuous operation without frequent replacements
2Productivity
If abrasive coating is applied to all surfaces including flutes, then material removal efficiency is improved, but airflow is blocked causing temperature increase and resin reactivation
Solution Approach 1:
The flutes are left uncoated or partially coated to maintain their airflow channels, while cutting surfaces receive full abrasive coating for efficient material removal. This local differentiation allows heat dissipation through uncoated flutes while maintaining cutting performance
Solution Approach 2:
The uncoated flutes serve as airflow channels that remove heat and resin particles from the cutting zone. By preserving the pneumatic function of flutes through selective non-coating, the design prevents temperature buildup and resin reactivation while maintaining cutting efficiency
3Reliability
If frequent mill bit replacement is performed, then cutting performance is maintained, but manufacturing costs increase
Solution Approach 1:
Instead of discarding the entire mill bit when wear occurs, the invention allows selective replacement of only the abrasive coating on cutting surfaces while retaining the bit body and flutes. This recovery approach maintains cutting performance through coating reapplication rather than full bit replacement, reducing costs
Solution Approach 2:
The invention changes the durability parameter of different surfaces differently - cutting surfaces are coated for wear resistance while flutes remain uncoated for thermal management. This parameter differentiation extends overall bit life without compromising cutting performance, reducing replacement frequency and costs
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
The design extends the mill bit's operating life by preventing resin particle reactivation and clogging, reducing the need for frequent replacements and lowering manufacturing costs through enhanced airflow and heat transfer.
Implementation Method 1
The interior of the mill bit is operatively coupled to a vacuum system for pulling a vacuum along the interior of the mill bit
Implementation Method 2
Current finishing mill bits become excessively hot during operation such that the resin particles in the composite powder produced from the milling process essentially reactivates, causing the powder to stick to the mill bit
Implementation Method 3
air and powder (e.g., fine fiber and resin chips) flows downwardly along the exterior of the mill bit via the flutes
Data Source
AI summary
A mill bit for the manufacture of a wind turbine blade includes an elongate based body having a proximal end, a distal end, an outer surface, and an internal bore that defines an inner surface, one or more flutes formed on the outer surface that defines one or more teeth, and an abrasive coating on at least a portion of the outer surface, wherein the one or more flutes are free of the abrasive coating. An abrasive coating may be selectively applied on the inner surface to provide flutes on the inner surface. Additionally, porting bores may be provided through the mill bit to fluidly connect the outside and inside of the mill bit. A method of making a mill bit is also described.