Milling Cutter Peak-Edge Geometry for Super Alloy Plunge Milling
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Solution Overview
Problem
Conventional mills are less effective when working with materials like super alloys due to differences in hardness and ductility compared to aluminum, and they struggle with increased production demands and wear resistance.
Innovation Solution
A cutting head design with axially extending peak portions on the cutting edges, allowing for initial contact and simultaneous engagement with the workpiece during Z-axis plunge milling, providing enhanced material removal and increased wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional mills are used to mill super alloys, then the mill can process hard materials, but the wear resistance decreases and effective run time shortens
Solution Approach 1:
The cutting edges are pre-formed with peak portions that extend axially from the cutting head surface. These peak portions make initial contact with the workpiece before the main cutting edges engage, allowing for gradual material engagement and reduced shock loading on the cutting edges during plunge milling operations
Solution Approach 2:
The cutting edges are designed with curved, rounded peak portions rather than sharp angular edges. This spherical/curved geometry distributes contact stress more evenly during initial engagement with the workpiece, reducing stress concentration and extending cutting edge life when milling hard super alloy materials
2Productivity
If conventional mills are used for Z-axis plunging operations, then material can be removed from the workpiece, but the material removal efficiency decreases for hard materials
Solution Approach 1:
The peak portions of the cutting edges perform preliminary engagement with the workpiece surface before the full cutting edges engage. This staged engagement process allows for more efficient material removal by gradually introducing cutting forces, preventing premature edge failure, and maintaining higher material removal rates when processing hard super alloy materials
Solution Approach 2:
The cutting edge geometry is modified by extending peak portions axially from the cutting head surface. This geometric parameter change creates a progressive engagement profile that improves material removal efficiency by distributing cutting forces over time and reducing shock loading during plunge operations on hard materials
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 cutting head design enhances material removal efficiency and wear resistance, enabling the milling of a wider range of materials, including super alloys, and supports increased production speeds.
Implementation Method 1
Rotation of the cutting head 150 around the Z-axis results in the removal of material from a work piece, such as an impeller blade, by the top cutting teeth 151
Data Source
Figure 1A~2
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Figure 9~10
AI summary
A cutting head 10 for a mill configured to rotate about an axis 12 to remove material from a work piece includes a base surface 16, a side region 18 connected to the base surface 16, and a top region 22 connected to the side region 18. The top region 22 defines a central area 28 and a periphery 32. A plurality of top teeth 24 are disposed on the top region 22. The top teeth 24 have cutting edges 26 configured to contact the work piece to remove material. Each cutting edge 26 extends from the central area 28 towards the periphery 32 and includes an axially extending peak portion 34.