Composite Cutting Tool Insert with Ruthenium Gradient
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Solution Overview
Problem
Conventional cutting tool inserts made from monolithic cemented carbide are expensive to produce and difficult to optimize for varying machining demands due to uniform ruthenium distribution, which limits their effectiveness in metal and metallic alloy machining applications.
Innovation Solution
A composite article comprising two regions of cemented carbide materials with differing ruthenium concentrations in their binders, where one region includes 8-20 weight percent ruthenium and the other lacks or has incidental ruthenium, allowing for tailored properties in specific regions of the cutting tool insert.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monolithic cemented carbide with uniform ruthenium distribution is used, then cutting tool provides consistent mechanical properties throughout, but production cost increases and optimization for varying machining demands becomes difficult
Solution Approach 1:
The patent applies local quality by creating regions with different ruthenium concentrations within the cutting tool insert. The core region contains lower ruthenium concentration (0-5 wt%) while the surface region contains higher ruthenium concentration (5-20 wt%), allowing each region to be optimized for its specific functional requirements while reducing overall material cost
Solution Approach 2:
The patent segments the cutting tool insert into distinct regions (core and surface) with different material compositions. This segmentation allows independent optimization of each region's properties and enables cost reduction by limiting expensive ruthenium to only where it is most beneficial
2Reliability
If higher grades of cemented carbide with more ruthenium are used throughout, then wear resistance and thermal cracking resistance improve, but material cost increases significantly
Solution Approach 1:
The patent concentrates ruthenium in the surface region (5-20 wt%) where wear resistance is most critical, while the core region contains minimal ruthenium (0-5 wt%). This localized distribution maintains wear resistance where needed while reducing overall ruthenium consumption by 40-90%
Solution Approach 2:
The patent applies ruthenium partially rather than uniformly throughout the entire insert. By providing ruthenium enrichment only in the surface region where it is most effective, the patent achieves the necessary wear protection without the excessive material usage of monolithic high-grade carbide
3Ease of manufacture
If monolithic carbide construction is used, then manufacturing process is simpler, but difficulty to optimize composition for differing demands in various regions increases
Solution Approach 1:
The patent enables composition optimization by creating regions with tailored ruthenium concentrations. The core region is optimized for toughness and shock resistance with lower ruthenium, while the surface region is optimized for wear resistance with higher ruthenium, allowing the single insert to handle varying machining demands
Solution Approach 2:
The patent uses composite carbide materials with different ruthenium concentrations in different regions. This composite construction combines the benefits of low-ruthenium carbide (cost-effectiveness, toughness) and high-ruthenium carbide (wear resistance, thermal stability) in a single optimized tool
Data Source
Figure 1(a)~1(d)
Figure 2(a)~2(c)
Figure 3(a)~3(c)
AI summary
A composite article selected from a cutting tool and a cutting tool insert for machining of metals and metallic alloys comprises a first region comprising a first composite material and a second region metallurgically bonded to the first region and comprising a second composite material. The first composite material and the second composite material individually comprise hard particles and a binder and the binder of at least one of the first composite material and the second composite material comprises ruthenium. A concentration of ruthenium in the binder of the first composite material is different from a concentration of ruthenium in the binder of the second composite material.