Track Pin Hardness Gradient via Local Heating
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Solution Overview
Problem
The high cost of manufacturing hardened track pins for track-type vehicles, which are crucial for durability but expensive to produce, necessitates a cost-effective solution without compromising durability.
Innovation Solution
A track pin with a gradient of hardness, where the material is locally heated to different depths to create regions of high and low hardness, optimizing strength and reducing manufacturing costs by using a soft core away from stress-prone areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire track pin is hardened to improve durability, then the pin becomes more resistant to wear and failure, but the manufacturing cost increases significantly
Solution Approach 1:
The patent applies local quality by creating a hardness gradient within the track pin structure. The outer peripheral region is hardened to high hardness (58-64 HRC) to resist wear and failure at stress-prone areas, while the inner core region maintains lower hardness (45-55 HRC) to reduce manufacturing costs and prevent brittleness. This selective hardening approach ensures durability where needed while optimizing manufacturing economics.
Solution Approach 2:
The patent segments the track pin into distinct regions with different material properties - an outer hardened region and an inner softer core region. This segmentation allows each region to be optimized for its specific functional requirements: the outer region for wear resistance and the inner region for cost-effectiveness and toughness, thereby resolving the contradiction between durability and manufacturing cost.
2Strength
If the track pin uses uniformly hard material throughout, then strength is maximized, but the pin becomes more brittle and susceptible to catastrophic failure
Solution Approach 1:
The patent applies local quality by creating a hardness gradient within the track pin structure. The outer peripheral region is hardened to high hardness (58-64 HRC) to resist wear and failure at stress-prone areas, while the inner core region maintains lower hardness (45-55 HRC) to reduce manufacturing costs and prevent brittleness. This selective hardening approach ensures durability where needed while optimizing manufacturing economics.
Solution Approach 2:
The patent effectively creates a composite structure within the single pin component by having two distinct material regions: a hardened outer shell and a softer inner core. This composite arrangement combines the advantages of hard materials (wear resistance) with soft materials (toughness and ductility), preventing catastrophic failure while maintaining strength.
3Reliability
If the track pin is fully hardened to ensure durability, then wear resistance improves, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent applies local quality by creating a hardness gradient within the track pin structure. The outer peripheral region is hardened to high hardness (58-64 HRC) to resist wear and failure at stress-prone areas, while the inner core region maintains lower hardness (45-55 HRC) to reduce manufacturing costs and prevent brittleness. This selective hardening approach ensures durability where needed while optimizing manufacturing economics.
Solution Approach 2:
The patent applies partial hardening action by treating only the outer peripheral region of the track pin rather than the entire pin. This partial treatment achieves the necessary wear resistance at the surface where contact occurs, while avoiding the excessive hardening of the core that would increase manufacturing complexity and risk of defects.
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 method reduces manufacturing costs while maintaining the durability of track pins by ensuring high hardness at stress-prone areas and using softer materials in low-stress regions, minimizing the likelihood of failure.
Implementation Method 1
the material is locally heated to different depths to create regions of high and low hardness
Data Source
AI summary
A method of hardening an article of manufacture that includes a body that defines a longitudinal axis made of a material that is capable of being hardened and that is intended for a particular use includes locally heating the material at a first location found on the article along the axis to a first predetermined depth in a direction that is perpendicular to the axis and locally heating the material at a second location found on the article along the axis to a second predetermined depth in a direction that is perpendicular to the axis, wherein the first predetermined depth is different than the second predetermined depth.