Grinding Element With Offset Abrasive Rows for Uniform Surface Finish
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Solution Overview
Problem
Existing grinding elements face issues with high material consumption, limited service life, and surface irregularities leading to adhesion and glare problems, particularly in applications like wind-turbine blades and safety helmets.
Innovation Solution
The abrasive particles in the grinding element are arranged in rows offset relative to adjacent rows, overlapping in the longitudinal direction to ensure uniform surface grinding, reducing smooth areas and enhancing adhesion while minimizing glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If abrasive particles are arranged in parallel rows without offset, then manufacturing is simpler, but surface uniformity deteriorates causing abraded grooves and smooth areas
Solution Approach 1:
The patent applies asymmetry by offsetting adjacent rows of abrasive particles relative to each other, creating a staggered pattern rather than parallel alignment. This asymmetric arrangement eliminates the formation of continuous abraded grooves while maintaining manufacturing feasibility, thereby resolving the contradiction between manufacturing simplicity and surface uniformity.
Solution Approach 2:
The patent introduces an offset dimension in the longitudinal direction of the abrasive cloth. By arranging particles in staggered rows with longitudinal displacement, the invention transforms the traditional two-dimensional grid pattern into a three-dimensional staggered configuration, preventing the formation of smooth areas and abraded grooves while remaining manufacturable.
2Quantity of substance
If conventional abrasive cloth is used, then material cost is lower, but service life is limited
Solution Approach 1:
The patent employs composite construction by combining abrasive particles with a reusable support structure (abrasive cloth mounted on a drum or wheel). The abrasive particles can be replenished or the entire assembly replaced, creating a composite system that extends service life while managing material costs through selective replacement of wear components versus structural components.
3Ease of manufacture
If conventional row arrangement is used, then particle placement is simpler, but adhesion and glare problems worsen on finished surfaces
Solution Approach 1:
The offset row arrangement creates an asymmetric particle distribution pattern that prevents the formation of continuous smooth areas on the treated surface. This asymmetry in particle placement eliminates the directional grooves that cause glare and adhesion problems, while the manufacturing process remains relatively simple through standardized offset positioning.
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 arrangement results in a rougher surface finish that improves adhesion and reduces glare, allowing for thinner coatings and minimizing post-treatment needs, with increased service life and cost-effectiveness.
Implementation Method 1
Grinding elements for use in grinding or polishing machines designed, e.g., as drum grinders or grinding wheels are known. These typically consist of a combination of an abrasive cloth and support brushes.
Data Source
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AI summary
Described is a grinding element (1) for use in rotary grinding or polishing tools used for grinding or polishing surfaces, and of the type comprising an elongate profile rail (2), including an abrasive cloth (4) and support brushes (5). The abrasive cloth (4) and the support brushes (5) are mounted in or on the profile rail (2), such that the abrasive cloth (4) is supported by the support brushes (15) on its inactive side (15). The abrasive cloth outside the profile rail (2) has a height (9) in the vertical direction (7) and a length (12) in the longitudinal direction (3). The support brushes (5) and the abrasive cloth (4) have different heights, a support brush height (11) and an abrasive cloth height (9), respectively, from the profile rail (2), such that the abrasive cloth (4) is terminated by an outer exposed edge area (19) extending beyond the top of the support brushes (5) and a short distance down along the outer exposed end portions (10) of the support brushes (5). The outer exposed edge area (19), when used, constitutes an active area (17) of the active side (16) of the abrasive cloth (4). The abrasive cloth (4) is coated only with abrasive material (18) in the active area (17). The abrasive material consists of particles (22) of, for example, diamonds (21) or similar materials. The abrasive cloth (4) is cut from an outer exposed canvas edge (8) toward the profile rail in a direction parallel to the vertical direction (7) in order to form slats (6). The particles are placed in adjacent rows (26), such that the particles (22) of the abrasive material in a row7 (26) are arranged with the particles offset relative to the particles (22) in the adjacent rows (26). The particles in the rows (26) are arranged spaced apart (29), such that an overlap of the abrasive particles occurs in the longitudinal direction (3) of the abrasive canvas.