Micro-Tooth CFRP End Mill for Chip Evacuation and Edge Wear
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional milling cutters face challenges in efficiently removing chips and reducing wear at the end cutting edge when machining carbon fiber reinforced polymer/plastic (CFRP), leading to poor surface quality and short tool life, especially during high-speed milling of impenetrable slots and windows.
Innovation Solution
Designing two parallel V-shaped chip pockets on the end cutting edge of the end mill, symmetrical around the axis, and optimizing the micro-tooth configuration to reduce cutting thickness and prevent corner chipping, with a peripheral cutting edge region featuring variable and constant inverse helical grooves for enhanced chip removal and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional milling cutters are used for high-speed milling of CFRP, then processing speed can be maintained, but chip removal performance deteriorates and end cutting edge wear increases
Solution Approach 1:
The end cutting edge is segmented into multiple micro-teeth (typically 3-5 micro-teeth per cutting edge) instead of a single continuous edge. This segmentation distributes the cutting load across multiple teeth, reduces chip thickness per tooth, and prevents catastrophic failure of the entire cutting edge when one micro-tooth wears or chips.
Solution Approach 2:
V-shaped chip pockets are designed extending from the end face toward the periphery of the end mill, creating a three-dimensional chip evacuation pathway. This adds a depth dimension to chip removal, allowing chips to be ejected along the V-shaped grooves rather than accumulating in a flat plane, significantly improving chip clearance at high speeds.
2Strength
If micro-tooth configuration is optimized to reduce cutting thickness, then micro-tooth edge damage is reduced, but device complexity increases
Solution Approach 1:
Different regions of the peripheral cutting edge are designed with different micro-tooth configurations. The micro-teeth density, size, and spacing are locally optimized based on the specific cutting requirements of different zones, allowing reduced cutting thickness at critical areas while maintaining overall structural simplicity.
Solution Approach 2:
The micro-tooth geometry parameters (tooth height, tooth spacing, tooth angle) are systematically varied to control cutting thickness. By adjusting these parameters, the cutting thickness is reduced to prevent edge damage while the design remains based on standard geometric modifications rather than complex structures.
3Productivity
If V-shaped chip pockets are designed on end cutting edge, then chip removal performance is enhanced, but manufacturing complexity increases
Solution Approach 1:
The V-shaped chip pockets are designed with curved, rounded contours rather than sharp angular geometry. This curvature allows the pockets to be manufactured using standard end mill profiling tools and CNC machining operations, avoiding the need for complex form tools or specialized manufacturing processes while still providing effective chip evacuation pathways.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The present invention belongs to the technical field of milling tools in machining, and relates to a special end cutting edge attached cutter for carbon fiber reinforced polymer/plastic (CFRP) with designable micro-tooth configuration, comprising an end cutting edge, a peripheral cutting edge with variation inverse helical groove, a peripheral cutting edge with constant inverse helical groove and a shank. Two parallel V-shaped chip pockets are designed on the end cutting edge of the cutter in two cutting edge directions which are symmetrical around a cutter axis as a center. The structure may enhance chip removal performance during high-speed milling of impenetrable slots and impenetrable windows, reduce wear of the end cutting edge, conduct configuration design for micro-teeth of the peripheral cutting edge, reduce the cutting thickness of the micro-tooth cutting edges, and effectively solve the problem of damage of the micro-tooth edges. To reduce the vibration of the end cutting edge and a transition part of peripheral cutting edge during slot milling, a section of peripheral cutting edge with variation left-hand inverse helical flute angle is designed near the end cutting edge. The peripheral cutting edge points to the end cutting edge direction, and finally enhances the surface quality of window bottoms and slot bottoms and the service life of the cutter.