Harvesting Knife Tooth Geometry for Wear and 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, designed to extend only partly over the outer contour, with a wedge-shaped tooth back and varying material thicknesses for different stresses, made from cold-worked materials like tempering steel, and a saw tooth profile for enhanced cutting efficiency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutter extends over the entire outer contour of the tooth, then cutting performance is improved, but tooth robustness decreases and tooth loss increases
Solution Approach 1:
The tooth is divided into two functional zones: a cutter-free tooth back region that provides structural support and robustness, and a cutter-equipped cutting region that provides cutting performance. This segmentation allows each zone to optimize its function without compromising the other.
Solution Approach 2:
Different regions of the tooth are given different properties: the tooth back is made cutter-free to maximize structural strength and reduce tooth loss, while the cutting region retains cutters for effective cutting. This local differentiation of properties resolves the contradiction between overall robustness and local cutting performance.
2Ease of manufacture
If the base body uses uniform material thickness, then manufacturing is simpler, but the knife cannot adequately handle different stress requirements of different tooth regions
Solution Approach 1:
The base body is designed with non-uniform material thickness, where the tooth back region has greater thickness for structural strength, and the cutting region has optimized thickness for cutting performance. This local variation in material properties allows the structure to handle different stress requirements in different regions.
3Reliability
If the tooth back is completely cutter-free, then tooth stability is maximized, but cutting effectiveness is reduced
Solution Approach 1:
The tooth is segmented into a cutter-free tooth back for stability and a cutter-equipped cutting region for effectiveness. This partial application of the cutter-free design resolves the contradiction by applying the stability-enhancing feature only where needed.
Solution Approach 2:
Instead of making the entire tooth cutter-free (excessive action that would reduce cutting effectiveness), only the tooth back portion is made cutter-free (partial action), maintaining the optimal balance between stability and cutting effectiveness.
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 service life by reducing wear and tooth loss, allowing for effective cutting before use and maintaining performance over time, while also simplifying production through efficient material use and processing methods.
Implementation Method 1
a thermal energy which is introduced into the base body for its coating is utilized for a hardening process of the base body
Implementation Method 2
made from cold-worked materials like tempering steel
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 has a plurality of teeth on its circumferencewherein, prior to a first application, at least one of the teeth has at least one cutter formed thereon.