Two-Piece Cutting Edge Attachment for Spring Harrow Tines
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Solution Overview
Problem
Spring harrow tines wear quickly and require frequent replacement, and existing solutions for attaching harder materials like tungsten carbide to the tines face challenges due to unsuitability for welding.
Innovation Solution
A two-piece cutting edge attachment featuring a chromium carbide mounting member weldable to the tine shaft and a tungsten carbide cutting edge member brazed to the mounting member, providing a hardened cutting edge that is securely attached to the tine shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tungsten carbide is used for the cutting edge member to increase hardness and wear life, then the wear resistance is improved, but the weldability deteriorates because tungsten carbide is not suitable for welded attachment
Solution Approach 1:
The cutting edge attachment is divided into two separate members: a mounting member made of weldable material (chromium carbide, stainless steel, or carbon steel) that can be welded to the tine shaft, and a cutting edge member made of tungsten carbide that provides superior wear resistance. This segmentation allows each component to be optimized for its specific function - the mounting member for easy attachment and the cutting edge member for maximum durability.
Solution Approach 2:
The mounting member serves as an intermediary component between the tine shaft and the tungsten carbide cutting edge member. It provides a weldable interface to the steel tine shaft while supporting the non-weldable tungsten carbide cutting edge, thus mediating between the requirements for weldability and wear resistance.
2Duration of action of stationary object
If a one-piece hardened edge member made of chrome is used to increase durability, then the wear life is improved compared to plain spring tine, but the overall wear resistance is insufficient compared to tungsten carbide
Solution Approach 1:
The attachment combines two different materials with complementary properties: the mounting member made of weldable material (chromium carbide, stainless steel, or carbon steel) and the cutting edge member made of tungsten carbide. This composite structure achieves both ease of manufacture (through weldable mounting member) and superior wear resistance (through tungsten carbide cutting edge), overcoming the limitations of using a single material.
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 solution extends the wear life of harrow tines by using tungsten carbide for the cutting edge while ensuring secure attachment through conventional welding techniques, offering improved durability and resistance.
Implementation Method 1
a prefabricated mounting member comprising a solid body having a predefined shape and formed of chromium carbide that is weldable to the spring steel of the harrow tine
Implementation Method 2
a cutting edge member of geometric shape and comprising tungsten carbide that is harder than the chromium carbide and spring steel and less weldable to the spring steel of the harrow tine than the chromium carbide of the mounting member
Data Source
AI summary
A multi-piece cutting edge attachment for a circular shaft of a harrow tine features a mounting member formed of a material that is weldable to, and distinct from, a first material of the harrow tine. A cutting edge member is formed of a third material that is harder than the first and second materials and less weldable to harrow tine than the second material of the mounting member. The cutting edge member has a front face and an opposing rear face that is conformingly shaped for placement against a front face of the mounting member at a lower end thereof. The multi-piece arrangement forms a cutting edge of greater hardness than that which is achievable by a material directly attachable to the tine itself.