Agricultural Disc With Hardness Gradient for Wear Resistance
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Solution Overview
Problem
Existing agricultural discs wear quickly and are prone to brittleness, limiting their lifespan and effectiveness in soil preparation, especially when subjected to significant stresses and varying soil conditions.
Innovation Solution
A metal disc with a ductile central part for fixation and a harder peripheral part for tillage, featuring a hardness gradient in both radial and transverse directions, made from a boron-doped steel alloy with controlled heat treatment to achieve varying hardness levels, enhancing wear resistance and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the disc is made with homogeneous hardness throughout, then the manufacturing process is simple, but the disc wears quickly at the periphery and has limited lifespan
Solution Approach 1:
The disc is designed with non-uniform hardness distribution: the peripheral working edge is hardened to high hardness (55-65 HRC) for wear resistance, while the central fixing part maintains lower hardness (45-55 HRC) for ductility. This local quality differentiation allows each region to have properties optimized for its specific function, resolving the contradiction between extended lifespan and manufacturing complexity.
Solution Approach 2:
The disc is segmented into distinct zones with different hardness characteristics: a hardened peripheral ring for soil contact, a transition zone, and a softer central hub for mounting. This segmentation enables differential heat treatment processes applied to specific regions, achieving enhanced wear resistance at the periphery without compromising overall structural integrity or excessive brittleness.
2Reliability
If the disc hardness is increased to improve wear resistance, then the periphery wears less, but the disc becomes more brittle and prone to breaking
Solution Approach 1:
Different regions of the disc are assigned different hardness levels to simultaneously achieve wear resistance and brittleness resistance. The peripheral working edge is hardened to 55-65 HRC for maximum wear resistance, while the central fixing part maintains 45-55 HRC for adequate ductility and impact resistance. This spatial variation in material properties resolves the contradiction between reliability and strength.
Solution Approach 2:
The disc effectively becomes a composite structure with regions of different hardness properties achieved through differential heat treatment. The combination of hard peripheral zones and softer central zones creates a functionally graded structure that balances wear resistance with toughness, preventing catastrophic failure while maintaining durability at the working edge.
3Adaptability or versatility
If the disc is made with uniform properties throughout, then the manufacturing process is simple, but it cannot adapt to varying stress conditions in different parts of the disc
Solution Approach 1:
The disc is manufactured with locally optimized properties: the peripheral region is hardened to withstand abrasive soil contact and high-stress cutting forces, while the central region remains softer to accommodate mounting stresses and thermal expansion. This local quality differentiation enhances adaptability to varying stress conditions without requiring excessively complex manufacturing, as the property variation follows a logical radial gradient.
Solution Approach 2:
The manufacturing process is segmented into differential heat treatment zones, allowing independent optimization of each region's properties. The peripheral zone receives aggressive hardening treatment while the central zone receives milder treatment, enabling the disc to adapt to different stress conditions in different locations while maintaining reasonable manufacturing simplicity through a systematic approach.
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 disc exhibits significantly improved wear resistance and mechanical stress tolerance, with wear resistance and fatigue resistance increased by up to three times compared to similar discs with homogeneous hardness, allowing for extended use and adaptability to different soil conditions.
Implementation Method 1
The steel undergoes a heat treatment in order to harden it so as to limit the wear of the disc
Implementation Method 2
This difference in hardness is obtained by a differential heat treatment during which an annular heat-conducting part is arranged at the periphery of the disc
Implementation Method 3
Induction heating means can be used to make it possible to carry out the tempering at variable temperature
Data Source
Figure 1~2
AI summary
This disk is a metal disk comprising a central ductile portion (10), particularly used for attaching the disk to a chassis or the like, and an outer circumferential portion (12), particularly for working on land and having a hardness greater than that of the central portion (10). The disk also has a transitional area (14), between the central portion (10) and the circumferential portion (12), that has a hardness gradient in a radial direction, and at least in the central portion (10), a hardness gradient is present in the body of the disk.