Indexable Cutting Insert Coating Thickness Ratio for Ductile Cast Iron
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Solution Overview
Problem
Existing indexable cutting inserts lack an optimal balance between wear resistance and toughness, particularly for high-speed cutting of ductile cast iron, and often experience surface layer detachment during use.
Innovation Solution
The development of an indexable cutting insert with a coating layer structure comprising an inner sublayer and an outer alumina sublayer, where the outer sublayer's thickness on the rake face side is greater than on the flank face side, providing a specific thickness ratio and compressive stress to enhance wear resistance and toughness, while preventing surface layer detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If alumina is used as the surface sublayer, then deposition resistance is improved, but detachment resistance deteriorates
Solution Approach 1:
The inner sublayer composed of TiN, TiCN, or TiBN acts as an intermediary between the base and the outer alumina sublayer. It provides strong adhesion to both the base and the alumina layer, preventing detachment while allowing the alumina outer layer to maintain its deposition resistance properties. This intermediary layer resolves the contradiction by decoupling the adhesion function from the wear resistance function.
Data Source
AI summary
An indexable cutting insert (1) includes a base (8) and a coating layer, wherein the coating layer includes an inner sublayer and an outer sublayer, each of subsublayer constituting the inner sublayer is composed of a compound containing at least one element selected from the group consisting of Group IVa elements, Group Va elements, Group VIa elements in the periodic table, Al, and Si, the outer sublayer is an alumina sublayer or a sublayer containing aluminum, and in portions of the outer sublayer participating in cutting, when an average thickness on the flank face (3) side is represented by A μm and an average thickness on the rake face (2) side is represented by B μm, A/B≦0.95.