Asymmetric Cemented Carbide Cutting Element Teeth
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Solution Overview
Problem
Existing cemented carbide cutting elements for agricultural soil cultivation tools with straight cutting edges fail to achieve a complete cut through weeds and herbaceous plants, leading to incomplete soil separation and reduced water absorption and crop yield.
Innovation Solution
The cutting element features teeth with first and second flanks of differing lengths, where the second flank is angled to ensure complete severing of weeds, and multiple teeth are arranged along the cutting region to catch and sever plants effectively, with a cemented carbide composition for increased wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If straight cutting edges are used on cemented carbide cutting elements, then wear resistance is improved, but cutting completeness deteriorates (weeds can move out of the way and slide past)
Solution Approach 1:
The invention replaces straight cutting edges with curved cutting edges that follow an arc. This curvature allows the cutting edge to engage weeds at multiple angles and positions, preventing weeds from sliding past and ensuring complete cutting while maintaining the wear resistance of cemented carbide material.
Solution Approach 2:
The invention introduces asymmetric tooth profiles with different flank angles (first flank angle α1 and second flank angle α2). This asymmetry creates varying cutting angles during the cutting cycle, enabling the cutting edge to effectively engage and sever weeds regardless of their orientation, thereby improving cutting completeness while preserving wear resistance.
2Productivity
If multiple teeth with different flank lengths are used, then cutting completeness is improved, but device complexity increases
Solution Approach 1:
The invention divides each tooth into two distinct flanks (first flank and second flank) with different lengths and angles. This segmentation allows each flank to perform specific cutting functions, ensuring complete weed severing while maintaining a relatively simple overall tooth structure that is manufacturable.
Solution Approach 2:
The invention applies different geometric properties to different parts of the tooth profile. The first flank has a specific angle α1 optimized for initial engagement, while the second flank has a different angle α2 optimized for complete severing. This local differentiation improves cutting effectiveness without requiring complex overall tooth designs.
Data Source
AI summary
Cutting element made of cemented carbide for an agricultural soil cultivation tool for cutting into the earth, which includes a top side and a bottom side, a front side, a back side opposite of the front side, and at least one lateral surface. The top and bottom sides are connected via the front side, back side, and the at least one lateral surface. The front side includes a cutting region having multiple teeth, and at least one tooth is formed with a first flank and a second flank. To achieve an efficient cutting into the earth with a complete cut through the weeds or herbaceous plants present in the earth, a profile line of the first flank and a profile line of the second flank have different lengths. In this manner, weeds are completely severed and killed, whereby use of sprays for killing weeds is reduced to protect the environment.