Cemented Carbide Necking Tool Composition for Wear Resistance
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Solution Overview
Problem
Existing necking dies in the can manufacturing industry face challenges with wear, deformation, and corrosion due to the susceptibility of binder phases to wet corrosion, and they do not match the thermal expansion of tool steel, leading to inefficiencies in the necking operation.
Innovation Solution
Development of cemented carbide necking tools with specific compositions, including varying proportions of WC, TiC, TiN, NbC, Cr3C2, Co, and Ni, which provide higher hardness, lower density, and closer thermal expansion to tool steel, enhancing toughness and resistance to wear and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional binder phases are used in cemented carbide necking dies, then the material provides adequate toughness, but the binder phases are susceptible to wet corrosion causing wear and deformation
Solution Approach 1:
The patent changes the chemical composition parameters of the binder phase by limiting Co to 5-15 wt% and Ni to 5-15 wt%, and adding Cr3C2 at 1-10 wt%, which modifies the corrosion resistance properties while maintaining adequate toughness through controlled parameter ranges
Solution Approach 2:
The patent creates a composite binder phase system combining Co, Ni, and Cr3C2 in specific proportions, where Cr3C2 provides corrosion resistance while Co and Ni contribute to toughness, achieving synergistic effects that resolve the contradiction between wear resistance and corrosion susceptibility
2Strength
If cemented carbide composition is optimized for higher hardness, then wear resistance improves, but thermal expansion mismatch with tool steel increases
Solution Approach 1:
The patent adjusts the WC content to 60-80 wt% (not too high to avoid excessive hardness and thermal expansion mismatch, not too low to maintain adequate hardness), and controls binder phase composition to achieve an optimal balance between hardness and thermal expansion properties that matches tool steel
3Strength
If WC content is increased to improve hardness, then wear resistance increases, but density increases
Solution Approach 1:
The patent optimizes WC content to 60-80 wt%, avoiding excessive WC content that would increase density, while maintaining sufficient hardness through this balanced composition range and the supporting binder phase system
Data Source
AI summary
A necking tool for manufacturing of metal beverage cans, the necking tool being a cemented carbide comprising in wt % of about 18 to about 63 WC, of about 21 to about 30 TiC, of about 0 to about 27 TiN, of about 0 to about 12 NbC, of about 0 to 2 Cr3C2, of about 8 to about 14 Co and of about 0 to about 6 Ni.