Spline Cutting Insert Alignment for Precise Aeronautical Machining
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Solution Overview
Problem
Existing methods for forming splines in aeronautical components, such as gear or meshing components, face challenges with narrow dimensional tolerances and require separate edge breaking processes, which are inefficient and costly.
Innovation Solution
A novel apparatus and method for machining splines using a holder and cutting insert with a perpendicular coupling, alignment features, and coolant outlets, allowing for precise cutting and simultaneous edge breaking, enabling complex and accurate spline formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gear shaping and gear hobbing machines are used to form splines, then narrow dimensional tolerances (Class 4 ANSI B92.1) are achieved, but manufacturing speed is slow and cost is high
Solution Approach 1:
The patent uses a cutting insert with a relief surface that is a copy or replica of the desired spline geometry. This relief surface is formed on the cutting insert itself, allowing it to generate splines by reciprocating motion without requiring complex specialized machinery. The copying principle enables standard CNC machines to produce spline geometries that previously required dedicated gear shaping and hobbing machines, thereby improving productivity while maintaining precision.
2Manufacturing precision
If gear shaping and gear hobbing machines are used to form splines, then narrow dimensional tolerances are achieved, but the machines are expensive
Solution Approach 1:
The cutting insert incorporates a relief surface that copies the spline geometry, eliminating the need for expensive specialized gear shaping and hobbing machines. This approach allows standard CNC equipment to perform spline formation, significantly reducing capital equipment costs while maintaining the ability to achieve narrow dimensional tolerances through precise control of the reciprocating motion and cutting parameters.
Solution Approach 2:
The cutting insert is a relatively simple, replaceable tool component compared to expensive specialized machines. While the insert itself has a limited life and may need replacement, this is far more economical than the capital investment and maintenance costs of dedicated gear shaping and hobbing machines. The insert can be replaced or reground when worn, providing a cost-effective solution for precision spline formation.
3Manufacturing precision
If gear shaping and gear hobbing machines are used to form splines, then splines are formed to narrow tolerances, but edge breaking cannot be performed on the same machine
Solution Approach 1:
The patent combines multiple functions into a single machining operation. The cutting insert is designed with a relief surface that performs both spline formation and edge breaking (filleting/chamfering) simultaneously during the same reciprocating motion cycle. This eliminates the need for separate post-processing operations on different machines, reducing process complexity while maintaining precision spline tolerances. The merging of functions is achieved through the specific geometry and motion control of the cutting insert.
Data Source
AI summary
An apparatus and corresponding method for machining at least one spline in an aeronautical component. The apparatus comprises a holder defining an axial direction about which the holder is moveable, and a cutting insert attachable to the holder. The apparatus further comprises a coupling for attaching the cutting insert to the holder about a second direction that is perpendicular to the axial direction of the holder. The holder may comprise a first alignment feature for orientating the cutting insert at a single orientation with respect to the holder. The cutting insert may comprise at least one cutting tooth, wherein each cutting tooth comprises a cutting edge. The cutting insert may comprise a first datum surface which is spaced from each cutting edge by a respective predetermined spacing.