Rotating Grinding Wheel With Segmented Fingers
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Solution Overview
Problem
Existing grinding wheels with stationary discs have limited abrasive surface utilization, risk of edge hooking, and produce fragile edges with concave sides, requiring inefficient manual operation and increasing fragility.
Innovation Solution
A grinding wheel with rotating discs featuring increasing finger and notch widths from hub to periphery, concave to convex finger surfaces, and pre-tensioned discs to maximize active surface area and prevent edge hooking, produced by plastic deformation of a single metal workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the grinding wheel uses stationary grinding discs with narrow peripheral region, then the structure is simple, but the active surface area for edge treatment is limited
Solution Approach 1:
The patent transforms the stationary grinding discs into rotating grinding discs that rotate in opposite directions. This dynamic configuration allows the entire surface area of the grinding discs to be utilized for edge treatment, not just the narrow peripheral region, thereby significantly increasing the active surface area while maintaining structural simplicity through the use of standard rotating disc components
Solution Approach 2:
The grinding discs are divided into multiple fingers protruding from the hub section, with intervals between fingers arranged to allow passage of opposite grinding disc fingers. This segmentation creates a V-shaped notch configuration that enables edges to be inserted and ground effectively while maximizing the utilization of the grinding disc surface area through the alternating finger arrangement
2Reliability
If the grinding wheel has stationary fingers, then the structure is simple, but there is risk of edge hooking upon insertion
Solution Approach 1:
The patent employs rotating grinding discs that rotate in opposite directions, creating a dynamic grinding action that eliminates the risk of edge hooking. The rotation ensures that the edge is continuously engaged with the abrasive surface rather than being caught by stationary fingers, thereby improving safety during edge insertion while maintaining structural simplicity
Solution Approach 2:
The fingers are arranged asymmetrically with increasing width from the hub section towards the periphery, and the intervals between fingers are dimensioned to allow passage of opposite grinding disc fingers. This asymmetric arrangement creates a V-shaped notch that guides edge insertion safely while preventing hooking, and the asymmetric finger width optimization maximizes the active surface area
3Strength
If the grinding wheel produces edges with concave sides, then the grinding action is effective, but the edge becomes thin and fragile
Solution Approach 1:
The rotating grinding discs create a dynamic grinding action that produces edges with convex sides instead of concave sides. The rotation ensures continuous contact and controlled material removal, resulting in stronger, more durable edges with convex geometry that are less prone to deformation and wear while maintaining effective grinding action
Solution Approach 2:
The patent changes the geometric parameters of the edge profile from concave to convex by utilizing the rotating disc configuration. The increasing finger width from hub to periphery and the V-shaped notch arrangement create specific contact patterns that produce convex edge sides, thereby improving edge strength and durability while maintaining precise geometric control
4Productivity
If the operator needs to turn the grinding wheel to non-used area, then the grinding action can be applied, but the efficiency is reduced
Solution Approach 1:
The rotating grinding discs eliminate the need for the operator to turn the grinding wheel to non-used areas. The continuous rotation ensures that the entire surface area is constantly available for grinding, allowing the operator to maintain continuous grinding action without interruption, thereby significantly improving productivity and reducing operational time
Solution Approach 2:
The rotating grinding discs enable continuous useful action throughout the entire surface area. The opposite rotation of the two grinding discs ensures that both surfaces are continuously engaged with the workpiece, eliminating idle time and maximizing grinding efficiency by maintaining constant productive action
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
Maximizes the active surface area for edge treatment, prevents edge hooking, and forms edges with convex sides, enhancing durability and efficiency by utilizing the entire abrasive surface and ensuring safe, continuous contact.
Implementation Method 1
a spring element (6) mountable and effective for pre-tensioning of the grinding discs (1, 2) away from each other in the axial direction
Implementation Method 2
the fingers (9) comprises an area (11) for treatment of a cutting edge
Implementation Method 3
grinding wheel for treatment of a cutting edge
Data Source
Figure 1~3
Figure 4~6
Figure 7
AI summary
A grinding wheel for treatment of a cutting edge, such as a knife's edge, the grinding wheel arranged mountable on a rotatable shaft to be brought in rotation by the driven rotation of the shaft, and comprising two grinding discs (1>2) opposing each other and arranged movable relative to each other in the shaft's longitudinal direction and pre-tensioned away from one another, each of the grinding discs having a hub section (8) with fingers (9) protruding freely from the hub section at a radial and an axial component of direction, wherein the fingers are arranged at intervals dimensioned for passage of the corresponding fingers of the opposite grinding disc such that the finger's axial components of direction together form an outwardly open, in an axial cross- sectional plane generally V-shaped notch (V) defined by the intersecting rotational planes of the crosswise running fingers, and in which the fingers each has an area (11) for treatment of the knife's edge. The V-shaped notch has an insertion region (I) in which the width of the notch (B) in the axial plane is greater at the leading edge of the finger than the corresponding width (B2) at the trailing edge of the finger, as seen in the direction of rotation of the grinding wheel.