Rotary Harrow Tine Body Segmented Cutting Elements
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Solution Overview
Problem
Rotary harrow tine bodies experience significant wear and abrasion, particularly when processing sandy soils, leading to a reduced service life due to the geometry of the cutting edge.
Innovation Solution
A recessed cutting element is securely anchored in the tine body, allowing for lateral force absorption and diversion, with a convex surface and segmented cutting edge design that optimizes wear distribution and reduces the risk of breakage, using hard materials like hard metal or ceramic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cutting edge is made of hard material to resist abrasion, then wear resistance is improved, but the cutting edge becomes brittle and prone to breakage
Solution Approach 1:
The cutting edge is divided into multiple cutting elements that can be individually secured in recesses along the tine body surface edge. This segmentation allows the hard material to be applied in discrete segments rather than a continuous brittle layer, reducing stress concentration and preventing catastrophic failure when one element wears or breaks.
Solution Approach 2:
Hard material cutting elements are applied only at specific locations where cutting function is needed, rather than coating the entire tine body. Each cutting element is secured in a recess at a specific position along the surface edge, providing localized wear resistance exactly where the cutting action occurs while maintaining the toughness of the underlying tine body material.
2Force
If the cutting edge geometry is optimized for penetration, then soil penetration capability is improved, but the cutting edge becomes more susceptible to abrasion
Solution Approach 1:
The cutting edge combines two different materials with complementary properties: the tine body provides the structural framework and penetration geometry, while the hard material cutting elements provide abrasion resistance. This composite approach allows the soft tine body to be shaped for optimal penetration while the hard cutting elements resist wear from sandy soils.
3Reliability
If a recess is created to secure the cutting element, then lateral force absorption is improved, but the manufacturing complexity increases
Solution Approach 1:
The recesses are pre-formed into the tine body during manufacturing, creating ready-made securement features before the cutting elements are attached. This preliminary preparation of the mounting structure simplifies the overall assembly process and ensures proper positioning and lateral force absorption without requiring complex fastening mechanisms.
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a soil-working tool, in particular a tine body (1) for a rotary harrow machine for working an agricultural soil surface, wherein the tine body (1) comprises a tine tip (2) and a preferably bent retaining element (3) adjoining the tine tip (2) and wherein the tine tip (2) has at least one cutting element (7, 8, 9, 10) on the lateral surface edge of the tine tip pointing in the direction of rotation. The lateral surface edge of the tine body (1) equipped with at least one cutting element (7, 8, 9, 10) has a recessed, preferably angled notch (12) for accommodating the the at least one cutting element (7, 8, 9, 10).