Carbide/Nitride Coated Cutting Insert With Convex Edges for Burr Control
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Solution Overview
Problem
Conventional cutting inserts with straight edges generate undesirable burrs during machining, leading to increased deburring time and costs, and existing cutting inserts do not effectively reduce burr formation.
Innovation Solution
A cutting insert with a substantially horizontal cylindrical segment shape featuring convex top and bottom cutting edges, a flat side, and a hole at the center of the flat side, designed to minimize burr formation by reducing Von Mises stresses and improving edge geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional straight cutting edges are used, then the cutting insert structure is simple and easy to manufacture, but burr formation increases significantly
Solution Approach 1:
The cutting edge is designed with a convex curved shape instead of a straight line, creating a rounded profile that gradually engages and disengages from the workpiece material. This curvature reduces sudden stress concentrations and allows material to be sheared more cleanly, significantly reducing burr formation while maintaining manufacturing feasibility through standard grinding and coating processes
2Object-generated harmful factors
If convex curved cutting edges are implemented, then burr formation is reduced, but the cutting insert design complexity increases
Solution Approach 1:
The invention specifies precise geometric parameters for the convex curved cutting edge, including curvature radius ratios (R1/R2 between 0.5-2.0), arc angles (30-150 degrees), and radius ranges (0.1-5.0mm). These controlled parameter variations allow optimization of burr reduction performance while maintaining manufacturability through standard tooling and coating processes, balancing performance improvement with design complexity
3Reliability
If carbide/nitride coatings are applied, then cutting edge durability and performance are enhanced, but manufacturing complexity and cost increase
Solution Approach 1:
The cutting insert employs composite coating structures combining carbide-based coatings (such as TiN, TiCN) with nitride-based coatings (such as TiN, AlN, SiN). These multi-layer composite coatings provide synergistic effects: carbide layers offer hardness and wear resistance, while nitride layers provide chemical stability and reduced adhesion. The composite structure enhances overall cutting edge durability and performance while utilizing established PVD/CVD coating technologies
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The convex-shaped cutting insert significantly reduces burr thickness and formation, decreasing the need for deburring processes and enhancing machining efficiency and productivity.
Implementation Method 1
The cutting insert is coated with at least one coat selected from the group consisting of a carbide coat, a nitride coat, a carbonitride coat, a diamond-like carbon (DLC) coat, and a combination of two or more of these coats
Implementation Method 2
The cutting insert is coated with at least one coat selected from the group consisting of a carbide coat, a nitride coat, a carbonitride coat, a diamond-like carbon (DLC) coat, and a combination of two or more of these coats
Data Source
AI summary
A cutting insert of a substantially horizontal cylindrical segment shape is described. The cutting insert comprises top and bottom surfaces having a circular segment shape. The cutting insert further comprises a convex side. The cutting insert further comprises a flat side. The cutting insert further comprises a top cutting edge which is formed where the convex side and the top surface meet, and a bottom cutting edge which is formed where the convex side and the bottom surface meet. The cutting insert further comprises a hole extending from the convex side towards the flat side. The hole is positioned at a center of a surface of the flat side.