Harvesting Knife Teeth With Partial Cutters for Lower Tooth Loss
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Solution Overview
Problem
Existing harvesting knives face challenges in achieving improved cutting properties and extended service life, with existing designs not adequately addressing wear and tooth loss during operation.
Innovation Solution
The harvesting knife features a base body with teeth that include cutters formed during manufacturing, featuring varying material thicknesses and geometries, including wedge-shaped tooth backs and partial cutters, made from cold-worked materials like tempering steel, and a method involving thermal energy for hardening and coating to enhance cutting efficiency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tooth is designed with a cutter extending over the entire outer contour, then cutting performance is improved, but the tooth becomes less robust and more prone to loss during operation
Solution Approach 1:
The cutter extends only partly over the outer contour of the tooth, creating different functional zones: a cutting zone with the cutter for enhanced cutting performance, and a robust zone with the cutter-free tooth back for improved stability and reduced tooth loss during operation
2Productivity
If the tooth back is formed entirely with a cutter, then cutting efficiency is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The tooth back is formed partly cutter-free, creating a clear distinction between the cutting area (with cutter) and the structural support area (without cutter), which simplifies the manufacturing process while maintaining cutting efficiency
3Ease of manufacture
If the base body is made from softer material, then manufacturing ease is improved, but wear resistance and service life decrease
Solution Approach 1:
The base body is made from cold-worked material with increased tensile strength (at least 500 N/mm²), changing the material parameters to achieve both improved manufacturing properties and enhanced wear resistance for extended service life
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
This design enhances cutting behavior and extends the service life of the harvesting knife by reducing wear and tooth loss, achieving robust and efficient cutting performance with improved manufacturing efficiency and cost-effectiveness.
Implementation Method 1
the base body is implemented at least partly of a cold-worked material, in particular of a cold-worked tempering steel
Implementation Method 2
a method for the production of a harvesting knife having a base body, which is configured to be applied in a manner rotating in a machine around a drive rotational axis allocated to said base body, and having a plurality of teeth on its circumference, wherein a thermal energy which is introduced into the base body for its coating is utilized for a hardening process of the base body
Data Source
AI summary
A harvesting knife has a base body, which is configured to be applied in a manner rotating in a machine around a drive rotational axis allocated to said base body, and having a plurality of teeth on its circumference.Prior to a first application, at least one of the teeth has at least one cutter formed thereon.