CFRP Strip Division and Chamfering for Wind Turbine Blades
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Solution Overview
Problem
The manufacturing and handling of long, heavy carbon-fibre reinforced plastic (CFRP) strips for wind turbine blades are challenging due to their length and weight, requiring improved methods for division and chamfering to facilitate efficient production and transportation.
Innovation Solution
A method and apparatus for dividing and chamfering CFRP strips simultaneously, using a grinding drum to create tapered chamfers that enhance stress transfer, allowing for efficient processing and reduced space requirements, and enabling the strips to be stacked and integrated into wind turbine blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If long, heavy CFRP strips are used for wind turbine blades, then load-bearing capacity is improved, but handling and manufacturing difficulty increases
Solution Approach 1:
The long CFRP strip is divided into multiple shorter strips by the dividing device. This segmentation reduces the weight and size of individual strips, making them easier to handle, transport, and process, while maintaining the overall load-bearing capacity through proper stacking and arrangement of multiple strips in the spar cap structure.
2Manufacturing precision
If traditional separate processes are used for dividing and chamfering CFRP strips, then manufacturing precision can be maintained, but manufacturing time and space requirements increase
Solution Approach 1:
The dividing device integrates two previously separate manufacturing operations - dividing the CFRP strip and creating chamfers at the ends - into a single simultaneous process. The dividing blade divides the strip while also forming the chamfer geometry, eliminating the need for separate chamfering equipment and operations. This merging maintains manufacturing precision through controlled blade geometry while significantly improving productivity by reducing process steps and factory space requirements.
3Reliability
If multiple separate manufacturing steps are used, then process control can be maintained, but production efficiency decreases
Solution Approach 1:
The dividing device combines dividing and chamfering operations into one integrated step, reducing the total number of manufacturing steps while maintaining process control through precise blade geometry and controlled feeding mechanisms. This integration improves manufacturing efficiency by reducing cycle time and eliminating intermediate handling steps.
Solution Approach 2:
The chamfer geometry is predetermined by the blade design and setup before the dividing operation begins. The blade is configured in advance to create the correct chamfer angles and dimensions, allowing the process to proceed automatically without requiring subsequent adjustment or finishing operations, thereby maintaining reliability while improving efficiency.
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 method increases manufacturing speed, reduces space needed, and improves stress transfer between strips, making the production of wind turbine blades more efficient and manageable.
Implementation Method 1
A method and apparatus for dividing and chamfering CFRP strips simultaneously, using a grinding drum to create tapered chamfers
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2
AI summary
A method of making a longitudinal reinforcing structure for a wind turbine blade. The method comprises a) providing an elongate master strip (62) of reinforcing material having substantially flat first and second surfaces, the distance between the first and second surfaces defining the thickness of the master strip; and b) dividing the master strip transversely to form a first strip and a shorter master strip, the respective strips being arranged end to end such that a trailing end of the first strip is located adjacent a new leading end of the master strip. The step of dividing the master strip comprises removing material from a dividing region extending through the entire thickness of the master strip, wherein the dividing region is shaped such that a chamfer (19c) at the trailing end (19b) of the first strip is created and a chamfer (63a) at the new leading end (63) of the master strip is created when the master strip is divided.