Reinforced Narrow-Width Parting Insert for High-Feed Cutting
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Solution Overview
Problem
Existing narrow-width parting-off inserts face limitations in withstanding high feed rates and machining various materials due to small minimum front sub-edge thickness, leading to instability and reduced tool life, especially when conventional tools and machines are used.
Innovation Solution
A narrow-width parting-off insert with a reinforced front sub-edge and increased minimum front sub-edge thickness, along with specific geometric features such as convex corner radii and relief surfaces, allows for higher feed rates and improved tool life without requiring specialized equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the minimum front sub-edge thickness is increased, then the insert can withstand higher feed rates and machining forces, but the cutting width must be maintained at a narrow value to minimize material wastage
Solution Approach 1:
The patent applies parameter changes by optimizing the minimum front sub-edge thickness to greater than 0.20 mm while maintaining a cutting width of 6 mm or less. This specific parameter combination allows the insert to withstand high feed rates and machining forces while minimizing material wastage during parting operations.
Solution Approach 2:
The patent applies local quality by reinforcing specifically the front sub-edge region with increased thickness (>0.20 mm) while keeping the overall insert width narrow (≤6 mm). This localized reinforcement provides the necessary strength at the cutting edge without increasing the overall material removal width, thus resolving the contradiction between edge strength and material wastage.
2Length of moving object
If conventional resilient clamping arrangements are used to hold the insert, then the tool width can be minimized, but the insert may dislodge under high feed rates and machining forces
Solution Approach 1:
The patent applies curvature by providing convex corner radii at the intersections of relief surfaces and the front sub-edge. This curvature design strengthens the insert corners to prevent dislodgement under high feed rates while maintaining a narrow tool width, thus resolving the contradiction between compact tool size and insert stability.
Solution Approach 2:
The patent applies parameter changes by specifying convex corner radii of at least 0.15 mm at the intersections of relief surfaces and the front sub-edge. This parameter optimization provides enhanced corner strength and insert stability under high feed rates while maintaining the narrow tool width characteristic of resilient clamping arrangements.
3Productivity
If the insert is designed for high feed rates, then productivity increases, but the insert may fail due to excessive forces on its small size
Solution Approach 1:
The patent applies parameter changes by optimizing multiple geometric parameters simultaneously: minimum front sub-edge thickness greater than 0.20 mm, cutting width of 6 mm or less, and convex corner radii of at least 0.15 mm. This coordinated parameter optimization enables the small insert to withstand the excessive forces generated at high feed rates while maintaining high productivity.
Solution Approach 2:
The patent applies composite material principles by combining the reinforced front sub-edge geometry with resilient clamping arrangements and optimized relief surface configurations. This composite design approach creates an integrated system where geometric reinforcement and clamping work together to enable high feed rates without insert failure.
Data Source
AI summary
A parting-off insert for relatively high feed includes a rake surface including a reinforced front sub-edge extending between two convex corner sub-edges. A cutting width WC is defined between distal points of the first and second convex corner sub-edges. The cutting width WC fulfills the condition: WC≤6 mm. The front sub-edge including a minimum front sub-edge thickness TF fulfilling the condition: TF>0.20 mm.