Curved Milling Insert Geometry for Longer Tool Life in Tough Alloys
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Solution Overview
Problem
Milling inserts for side and face milling tools face challenges in achieving extended tool life and toughness when working with stainless steel, titanium, and heat-resistant super alloys, while maintaining high-quality surface finishes and being cost-efficient.
Innovation Solution
The milling insert design features a main cutting edge that slopes downward from corner cutting edges, a convex main cutting edge shape, and a radially sloping main radial clearance surface, allowing for reduced cutting forces, improved toughness, and efficient grinding processes, enabling longer tool life and precise machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional milling inserts are used for machining stainless steel, titanium and heat resistant super alloys, then the tool life and toughness are insufficient, but modifying the cutting edge geometry increases manufacturing complexity
Solution Approach 1:
The patent applies curvature to the main cutting edge by forming it with a specific radius of curvature R1. This curved geometry allows the cutting edge to gradually engage with the workpiece material, reducing impact forces and improving toughness during machining of difficult materials like stainless steel and titanium, thereby extending tool life without requiring complex multi-component structures
Solution Approach 2:
The patent modifies geometric parameters of the cutting edge, specifically the radius of curvature R1 and the slope angle alpha, to optimize performance. By adjusting these parameters, the cutting edge achieves improved toughness and reduced cutting forces when machining hard materials, extending tool life while maintaining a relatively simple insert structure that can be manufactured using conventional processes
2Duration of action of stationary object
If the main cutting edge is modified to improve toughness and reduce cutting forces, then tool life is extended, but manufacturing precision and surface finish quality may be compromised
Solution Approach 1:
The curved main cutting edge with radius of curvature R1 produces a smoother surface finish by gradually engaging the cutting tool with the workpiece, reducing vibrations and chatter. This curvature also improves toughness by distributing cutting forces over a longer engagement length, thereby extending tool life while maintaining or even improving surface quality
Solution Approach 2:
The sloping main cutting edge with angle alpha creates a dynamic engagement with the workpiece, allowing the cutting edge to gradually enter the material rather than impacting it suddenly. This dynamic approach reduces cutting forces and improves toughness, extending tool life while the controlled slope ensures precise dimensional accuracy and good surface finish
3Duration of action of stationary object
If complex cutting edge geometries are implemented to improve tool life, then manufacturing costs increase, but simpler geometries reduce tool life
Solution Approach 1:
The patent optimizes specific geometric parameters (radius of curvature R1 and slope angle alpha) that can be achieved through conventional grinding and manufacturing processes. By carefully selecting these parameters within specific ranges, the insert achieves improved toughness and extended tool life without requiring complex multi-step manufacturing processes or specialized equipment, thereby controlling production costs
Solution Approach 2:
The curved main cutting edge geometry, while improving toughness and tool life, can be manufactured using standard single-pass grinding techniques. The curvature is designed with practical radius values that are achievable with conventional tooling, avoiding the need for complex multi-axis machining or specialized forming processes, thus maintaining cost-effectiveness
Data Source
AI summary
A milling insert for a side and face milling tool includes an upper side defining an upper extension plane, a lower side defining a lower extension plane, and a side surface extending between the upper and the lower sides around a periphery of the insert that includes a main radial clearance surface, two opposite axial clearance surfaces and two corner clearance surfaces. At least one cutting edge is formed in a transition between the upper and the side surfaces, wherein each cutting edge includes a main cutting edge extending above the main radial clearance surface and two corner cutting edges extending above the corner clearance surfaces on opposite sides of the main cutting edge. The main cutting edge slopes downward toward a midpoint of the main cutting edge and the main cutting edge and the main radial clearance surface slope outward from the corner cutting edges toward the midpoint.