Turbine Blade Leading Edge Forming Tool to Reduce Chatter
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Solution Overview
Problem
The existing methods for forming leading edges of turbine blades, such as point milling, face challenges in machining thin blades due to chattering and deflection, resulting in an imperfect aerodynamic shape and requiring additional steps to achieve a smooth edge.
Innovation Solution
A forming tool with a cylindrically-shaped body and relief notches is used to precisely shape the leading edges, featuring different notch contours for various edge areas, allowing for precise grinding or cutting and reducing vibration during the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If point milling is used to machine the leading edge of thin turbine blades, then the cutting action can remove material, but chattering and deflection occur resulting in poor machining precision
Solution Approach 1:
The forming tool applies different notch contours to different portions of the leading edge (tip area versus remaining area), allowing each region to be formed with optimized local geometry that prevents chattering and deflection while achieving precise aerodynamic shapes
Solution Approach 2:
A forming tool with relief notches acts as an intermediary between the rough edge and the final finished edge, providing a controlled intermediate forming step that eliminates the need for point milling and prevents harmful chattering and deflection
2Manufacturing precision
If multiple processing steps are used to form the leading edge (rough edge removal, semi-finished edge formation, point milling), then material can be removed to create the leading edge, but the process complexity increases and additional time is required
Solution Approach 1:
The forming tool combines multiple functions into a single tool: it performs both rough edge removal and finished edge formation in one operation. The relief notches are designed to directly form the final aerodynamic shape, merging what were previously separate operations (rough edge removal and point milling) into a single unified process
Solution Approach 2:
The relief notches on the forming tool are pre-configured with the exact contour of the desired finished leading edge. This preliminary action allows the tool to directly form the final shape in a single pass, eliminating the need for subsequent point milling operations and reducing overall process complexity
3Productivity
If traditional cutting methods are used on thin blades, then material removal can occur, but vibration increases reducing process stability
Solution Approach 1:
The forming tool changes the cutting parameters by using relief notches that are specifically designed to reduce vibration and chatter during material removal. The notch geometry and depth are optimized to maintain process stability while achieving efficient material removal, allowing high productivity without sacrificing stability
Data Source
AI summary
A forming tool for forming leading edges of turbine blades is disclosed. In various embodiments, a forming tool may comprise a cylindrically-shaped body having a notch around the circumference of the cylindrically-shaped body. The notch may be positioned perpendicularly to a center axis of the cylindrically-shaped body. Further, the notch may have a notch contour with an upper notch contour and a lower notch contour, and where the notch contour is a relief of a selected turbine blade leading edge. The forming tool may be a grinding tool or a cutting tool. Moreover, a forming process may comprise forming, by a forming tool, a first portion of a turbine blade leading edge with a rough edge result, and forming, by a milling cutter, a second portion of the turbine blade leading edge with a rough edge result.