Ramping Insert Geometry for High-Feed Milling
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Solution Overview
Problem
High-feed milling tools with limited indexable positions require complex designs to achieve necessary clearance, making them less cost-effective compared to tools with more indexable positions, and existing solutions struggle to balance axial and radial positioning for alternating high-feed face milling and ramping operations without insert position changes.
Innovation Solution
A ramping insert with opposing rake surfaces and converging ramping and feed sub-edges, designed for four indexable positions, and a high-feed milling tool with specific pocket and surface configurations to allow for abutment and screw fastening, enabling efficient ramping and high-feed operations with simpler manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a high-feed milling tool is designed with limited indexable positions (four positions), then the insert can be manufactured more simply and cost-effectively, but the tool requires a more complex design to achieve necessary clearance for ramping and high-feed operations
Solution Approach 1:
The insert is divided into multiple functional surfaces (first and second rake surfaces, peripheral surface) with specific geometric features (approach angles, clearance angles) that enable different operations. The tool is segmented with corresponding pocket surfaces (pocket approach surface, pocket clearance surface) that work with the insert surfaces to achieve the required clearance without increasing insert complexity
Solution Approach 2:
The solution introduces a new dimensional approach by utilizing the approach angle and clearance angle dimensions to create the necessary space for chip evacuation and operation transitions. Instead of adding more indexable positions, the patent uses angular dimensions (approach angles alpha1, alpha2 and clearance angles gamma1, gamma2) to achieve the required functionality
2Ease of manufacture
If a ramping insert is configured for only four indexable positions, then manufacturing costs are reduced, but achieving alternating high-feed face milling and ramping operations becomes more difficult without changing insert position
Solution Approach 1:
The insert is designed with universal functionality to perform both high-feed face milling and ramping operations within its four indexable positions. The specific geometric configuration of the cutting edges and surfaces allows the same insert to adapt to different operations by changing tool orientation and engagement parameters, eliminating the need for additional indexable positions
Solution Approach 2:
The system achieves operational versatility through dynamic adjustment of cutting parameters and tool orientation rather than through static multiplication of insert positions. The converging ramping and feed sub-edges allow the insert to dynamically adapt its cutting action between ramping and face milling modes
3Productivity
If the ramping and feed sub-edges are made longer than the side sub-edges, then the cutting performance for ramping and high-feed operations is improved, but the insert geometry becomes more complex
Solution Approach 1:
The insert geometry applies local quality by making the ramping and feed sub-edges longer than the side sub-edges, concentrating the enhanced cutting performance where it is most needed for ramping and high-feed operations. This localized geometric differentiation optimizes productivity without requiring complete redesign of the entire insert structure
Data Source
Figure 1A~1D
Figure 2A~2B
Figure 2C
AI summary
A high-feed milling tool assembly (10) includes a tool (12) and a ramping insert (14). The ramping insert (14) includes ramping, feed and side sub-edges. The ramping and feed sub-edges are longer than the side sub-edges and converge with increasing proximity to the side sub-edge to which they are both connected.