Milling Insert Waveform Design for FRP Cutting Resistance
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Solution Overview
Problem
Conventional milling inserts with waveform cutting edges are effective for metal materials but fail to optimize chip control and edge strength when cutting fiber-reinforced plastics, leading to increased cutting resistance and reduced tool lifetime.
Innovation Solution
The design of milling inserts with rake faces and flanks forming cutting edges, featuring serrations and a waveform shape with specific concave and convex circular arc portions, along with wiper edges, to reduce cutting resistance and enhance wear resistance, allowing for a longer tool lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional waveform cutting edges are used for metal material cutting, then chip control is enhanced and cutting edges strength is maintained, but cutting resistance increases and tool lifetime decreases when cutting fiber-reinforced plastics
Solution Approach 1:
The cutting edge is designed with non-uniform waveform characteristics where the amplitude and wavelength vary along the cutting edge. Specifically, the waveform amplitude is smaller near the tool center and larger toward the periphery, creating locally optimized cutting conditions that reduce cutting resistance while maintaining edge strength for FRP materials
Solution Approach 2:
The waveform parameters (amplitude, wavelength, frequency) are specifically optimized for FRP cutting rather than using conventional sine waves designed for metal cutting. This parameter optimization reduces cutting resistance by better controlling chip formation characteristics specific to fiber-reinforced plastics
2Strength
If conventional sine wave cutting edges are used, then cutting edge strength is maintained for metal cutting, but chip control and cutting performance are not optimized for fiber-reinforced plastics
Solution Approach 1:
The waveform amplitude varies locally along the cutting edge, being smaller near the center and larger at the periphery. This local variation optimizes chip control for different radial positions during FRP cutting while maintaining sufficient edge strength throughout the entire cutting edge
3Strength
If waveform cutting edges are designed for metal cutting, then cutting edge strength is high, but tool lifetime is reduced due to increased cutting resistance in fiber-reinforced plastics
Solution Approach 1:
The waveform parameters are specifically optimized for FRP cutting conditions, with amplitude and wavelength values that minimize cutting resistance while maintaining edge strength. This optimization directly extends tool lifetime by reducing wear and heat generation during FRP machining operations
Data Source
AI summary
A milling insert includes a polygonal tubular insert body which has: rake faces on one polygonal surface thereof, flanks composed of circumferential surfaces adjacent to the polygonal surface, and cutting edges defining a ridge line where the rake faces and flanks intersect each other as cutting edges. The rake faces have serrations where mount portions and valley portions are arrayed alternately to intersect the cutting edges. The ridge line has a waveform shape when the flanks are viewed from above. Bottom portions and top portions of the waveform are formed into concave circular arc portions and convex circular arc portions, respectively, and are alternately repeated. Both of the concave and convex circular arc portions are a ¼ circular arc or more to a ⅓ circular arc or less. Each of the concave circular arc portions is unevenly located between the convex circular arc portions adjacent thereto.