Roller Ring Body Halves Segmented Bonding for Soil-Tillage Wear
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Solution Overview
Problem
Existing roller rings for soil-tillage devices experience hardness losses in wear-intensive zones due to welding, leading to thermal influences on the microstructure and potential corrosion from incoming liquids.
Innovation Solution
A roller ring design featuring rotationally symmetrical body halves with flange-shaped profile portions divided into inner contact and outer edge portions, connected via a substance-to-substance bond that minimizes thermal influence, using methods like melt-on, fusion, or admixture bonding, with openings arranged to maximize distance from the outer edge for reduced heat impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the body halves are connected by welding (plug weld or circumferential weld seam), then the connection strength is improved, but hardness losses occur in the wear-intensive zone due to thermal influence on the microstructure
Solution Approach 1:
The profile portion is divided into two distinct zones: an inner contact portion for connection and an outer edge portion for wear resistance. This segmentation allows the connection function and wear resistance function to be spatially separated, enabling welding in the inner zone without compromising the hardness of the outer wear zone.
Solution Approach 2:
Different regions of the profile portion are given different properties: the inner contact portion is designed for bonding (with possible openings for weld access), while the outer edge portion is cured to maximize hardness and wear resistance. This local differentiation ensures that thermal influence from welding does not affect the wear-intensive outer zone.
2Temperature
If only punctiform connection of the two body halves is used, then thermal influence is reduced, but incoming liquid can make the varnishing process more difficult and can lead to unwanted corrosion
Solution Approach 1:
Openings are introduced in the inner contact portion to enable substance-to-substance bond while maintaining liquid drainage capability. These openings allow weld material or bonding agent to access the connection interface while preventing liquid accumulation that would cause corrosion or interfere with varnishing.
3Strength
If the outer edge portions are embodied in a cured manner to increase wear resistance, then the wear resistance is improved, but the connection of body halves becomes more difficult due to hardness of the material
Solution Approach 1:
The profile portion is segmented into an inner contact portion and an outer edge portion. The outer edge portion is cured for wear resistance, while the inner contact portion remains uncured or less cured to maintain ductility and facilitate welding or bonding operations.
Solution Approach 2:
The curing process is applied selectively to the outer edge portions before final assembly, allowing the inner contact portions to remain in a more ductile state that facilitates subsequent welding or bonding operations.
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 enhances wear resistance, maintains original material strength, and reduces the risk of corrosion and brittle fractures, ensuring longer durability and resilience against thermal stress and impact.
Implementation Method 1
The body halves are at least partially connected to one another by means of a substance-to-substance bond radially on the inner side of the contact portion
Implementation Method 2
The body halves are at least partially connected to one another by means of a substance-to-substance bond radially on the inner side of the contact portion
Implementation Method 3
The outer edge portions are in particular embodied in a cured manner
Data Source
AI summary
A roller ring (8) for a roller (3,4) of a soil-tillage apparatus (1) comprises two rotationally symmetrical body halves (9) arranged opposite one another. Each body half (9) has a flange-shaped profile portion (10) extending in the radial direction (R), against which the body halves (9) abut over the entire surface. At least one profile portion (10) is divided into an inner contact portion (12) as well as an adjoining outer edge portion (13). The body halves (9) are at least partially connected by means of a substance-to-substance bond (15) radially on the inner side of the contact portion (12).