Hard Washer for Degradation Assembly Wear Reduction
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Solution Overview
Problem
The asphalt recycling industry faces significant downtime due to high wear of degradation assemblies with tungsten carbide tips, which are used in pavement degradation, mineral breaking, and excavation, leading to inefficiencies and increased maintenance costs.
Innovation Solution
A degradation assembly design featuring a wear-resistant tip with a shank and washer system, where the washer's outer edge is made of hard materials like chromium, tungsten, or diamond, and is rotationally fixed to the holder, providing enhanced durability and reducing wear by distributing pressure effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If tungsten carbide tip degradation assemblies are used for pavement degradation, then the ability to break hard materials is improved, but wear of the assembly increases leading to frequent maintenance
Solution Approach 1:
The patent applies composite materials by combining tungsten carbide tip with a washer made of hard material (hardness greater than 58 HRC) such as chromium, tungsten, tantalum, niobium, titanium, molybdenum, carbide, diamond, or diamond impregnated carbide. This composite structure integrates the high strength of tungsten carbide with the exceptional wear resistance of the hard material washer, resolving the contradiction between breaking capability and wear resistance.
Solution Approach 2:
The patent applies local quality by positioning the hard material washer specifically at the interface between the attack tool and the holder, where wear occurs most intensely. The washer is fitted around the shank of the attack tool and positioned between the attack tool body and the holder top surface, concentrating wear protection exactly where it is needed most while maintaining the overall structural integrity of the assembly.
2Productivity
If degradation assemblies with hard tips are used, then material degradation efficiency is improved, but downtime due to maintenance increases
Solution Approach 1:
The composite structure of tungsten carbide tip combined with hard material washer maintains high material degradation efficiency while significantly extending assembly lifespan. The hard material washer prevents wear at the critical interface, allowing the attack tool to maintain its breaking capability for longer periods without maintenance, thus resolving the contradiction between productivity and downtime.
Solution Approach 2:
The washer acts as a sacrificial wear component that protects the more expensive attack tool and holder. By positioning the washer at the wear interface, it absorbs the wear damage that would otherwise affect the entire assembly, allowing for easier and cheaper replacement of only the washer rather than the entire degradation assembly, thereby reducing maintenance downtime.
3Reliability
If the washer is made with hard material greater than 58 HRC, then wear resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the degradation assembly into distinct components: the attack tool with tungsten carbide tip, the hard material washer, and the holder. The washer is a separate, fitted component that can be manufactured independently and then assembled onto the attack tool shank. This segmentation allows each component to be optimized and manufactured separately using appropriate processes, reducing overall manufacturing complexity while achieving superior wear resistance.
Solution Approach 2:
The hard material washer serves as an intermediary component between the attack tool and the holder. It is fitted around the shank of the attack tool and positioned between the attack tool body and the holder top surface. This intermediary structure simplifies the overall design by providing a dedicated wear interface that can be manufactured and replaced independently, reducing the complexity of manufacturing the entire assembly as a single complex component.
Data Source
AI summary
In one aspect of the invention, a degradation assembly has an attack tool with a body and a shank, the body having a wear-resistant tip. The shank is disposed within a bore of a holder secured to a driving mechanism. A washer is positioned in-between the attack tool and the holder and fitted around the shank of the attack tool, wherein an outer edge of the washer has a hardness greater than 58 HRc.